Revert "Remove unused TLS, NET, and X.509 files"
This reverts commit a4308b29a42a00fcbffa7d6d041946feeddc0ce9.
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
new file mode 100644
index 0000000..abe2450
--- /dev/null
+++ b/library/ssl_tls.c
@@ -0,0 +1,10634 @@
+/*
+ * SSLv3/TLSv1 shared functions
+ *
+ * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ */
+/*
+ * The SSL 3.0 specification was drafted by Netscape in 1996,
+ * and became an IETF standard in 1999.
+ *
+ * http://wp.netscape.com/eng/ssl3/
+ * http://www.ietf.org/rfc/rfc2246.txt
+ * http://www.ietf.org/rfc/rfc4346.txt
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_SSL_TLS_C)
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdlib.h>
+#define mbedtls_calloc calloc
+#define mbedtls_free free
+#endif
+
+#include "mbedtls/debug.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/ssl_internal.h"
+#include "mbedtls/platform_util.h"
+
+#include <string.h>
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+#include "mbedtls/psa_util.h"
+#include "psa/crypto.h"
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#include "mbedtls/oid.h"
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+#include "mbedtls/psa_util.h"
+#endif
+
+static void ssl_reset_in_out_pointers( mbedtls_ssl_context *ssl );
+static uint32_t ssl_get_hs_total_len( mbedtls_ssl_context const *ssl );
+
+/* Length of the "epoch" field in the record header */
+static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl )
+{
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ return( 2 );
+#else
+ ((void) ssl);
+#endif
+ return( 0 );
+}
+
+/*
+ * Start a timer.
+ * Passing millisecs = 0 cancels a running timer.
+ */
+static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs )
+{
+ if( ssl->f_set_timer == NULL )
+ return;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) );
+ ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs );
+}
+
+/*
+ * Return -1 is timer is expired, 0 if it isn't.
+ */
+static int ssl_check_timer( mbedtls_ssl_context *ssl )
+{
+ if( ssl->f_get_timer == NULL )
+ return( 0 );
+
+ if( ssl->f_get_timer( ssl->p_timer ) == 2 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) );
+ return( -1 );
+ }
+
+ return( 0 );
+}
+
+static void ssl_update_out_pointers( mbedtls_ssl_context *ssl,
+ mbedtls_ssl_transform *transform );
+static void ssl_update_in_pointers( mbedtls_ssl_context *ssl,
+ mbedtls_ssl_transform *transform );
+
+#define SSL_DONT_FORCE_FLUSH 0
+#define SSL_FORCE_FLUSH 1
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+
+/* Forward declarations for functions related to message buffering. */
+static void ssl_buffering_free( mbedtls_ssl_context *ssl );
+static void ssl_buffering_free_slot( mbedtls_ssl_context *ssl,
+ uint8_t slot );
+static void ssl_free_buffered_record( mbedtls_ssl_context *ssl );
+static int ssl_load_buffered_message( mbedtls_ssl_context *ssl );
+static int ssl_load_buffered_record( mbedtls_ssl_context *ssl );
+static int ssl_buffer_message( mbedtls_ssl_context *ssl );
+static int ssl_buffer_future_record( mbedtls_ssl_context *ssl );
+static int ssl_next_record_is_in_datagram( mbedtls_ssl_context *ssl );
+
+static size_t ssl_get_current_mtu( const mbedtls_ssl_context *ssl );
+static size_t ssl_get_maximum_datagram_size( mbedtls_ssl_context const *ssl )
+{
+ size_t mtu = ssl_get_current_mtu( ssl );
+
+ if( mtu != 0 && mtu < MBEDTLS_SSL_OUT_BUFFER_LEN )
+ return( mtu );
+
+ return( MBEDTLS_SSL_OUT_BUFFER_LEN );
+}
+
+static int ssl_get_remaining_space_in_datagram( mbedtls_ssl_context const *ssl )
+{
+ size_t const bytes_written = ssl->out_left;
+ size_t const mtu = ssl_get_maximum_datagram_size( ssl );
+
+ /* Double-check that the write-index hasn't gone
+ * past what we can transmit in a single datagram. */
+ if( bytes_written > mtu )
+ {
+ /* Should never happen... */
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ return( (int) ( mtu - bytes_written ) );
+}
+
+static int ssl_get_remaining_payload_in_datagram( mbedtls_ssl_context const *ssl )
+{
+ int ret;
+ size_t remaining, expansion;
+ size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+ const size_t mfl = mbedtls_ssl_get_max_frag_len( ssl );
+
+ if( max_len > mfl )
+ max_len = mfl;
+
+ /* By the standard (RFC 6066 Sect. 4), the MFL extension
+ * only limits the maximum record payload size, so in theory
+ * we would be allowed to pack multiple records of payload size
+ * MFL into a single datagram. However, this would mean that there's
+ * no way to explicitly communicate MTU restrictions to the peer.
+ *
+ * The following reduction of max_len makes sure that we never
+ * write datagrams larger than MFL + Record Expansion Overhead.
+ */
+ if( max_len <= ssl->out_left )
+ return( 0 );
+
+ max_len -= ssl->out_left;
+#endif
+
+ ret = ssl_get_remaining_space_in_datagram( ssl );
+ if( ret < 0 )
+ return( ret );
+ remaining = (size_t) ret;
+
+ ret = mbedtls_ssl_get_record_expansion( ssl );
+ if( ret < 0 )
+ return( ret );
+ expansion = (size_t) ret;
+
+ if( remaining <= expansion )
+ return( 0 );
+
+ remaining -= expansion;
+ if( remaining >= max_len )
+ remaining = max_len;
+
+ return( (int) remaining );
+}
+
+/*
+ * Double the retransmit timeout value, within the allowed range,
+ * returning -1 if the maximum value has already been reached.
+ */
+static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl )
+{
+ uint32_t new_timeout;
+
+ if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max )
+ return( -1 );
+
+ /* Implement the final paragraph of RFC 6347 section 4.1.1.1
+ * in the following way: after the initial transmission and a first
+ * retransmission, back off to a temporary estimated MTU of 508 bytes.
+ * This value is guaranteed to be deliverable (if not guaranteed to be
+ * delivered) of any compliant IPv4 (and IPv6) network, and should work
+ * on most non-IP stacks too. */
+ if( ssl->handshake->retransmit_timeout != ssl->conf->hs_timeout_min )
+ {
+ ssl->handshake->mtu = 508;
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "mtu autoreduction to %d bytes", ssl->handshake->mtu ) );
+ }
+
+ new_timeout = 2 * ssl->handshake->retransmit_timeout;
+
+ /* Avoid arithmetic overflow and range overflow */
+ if( new_timeout < ssl->handshake->retransmit_timeout ||
+ new_timeout > ssl->conf->hs_timeout_max )
+ {
+ new_timeout = ssl->conf->hs_timeout_max;
+ }
+
+ ssl->handshake->retransmit_timeout = new_timeout;
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
+ ssl->handshake->retransmit_timeout ) );
+
+ return( 0 );
+}
+
+static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl )
+{
+ ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min;
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
+ ssl->handshake->retransmit_timeout ) );
+}
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+/*
+ * Convert max_fragment_length codes to length.
+ * RFC 6066 says:
+ * enum{
+ * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
+ * } MaxFragmentLength;
+ * and we add 0 -> extension unused
+ */
+static unsigned int ssl_mfl_code_to_length( int mfl )
+{
+ switch( mfl )
+ {
+ case MBEDTLS_SSL_MAX_FRAG_LEN_NONE:
+ return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN );
+ case MBEDTLS_SSL_MAX_FRAG_LEN_512:
+ return 512;
+ case MBEDTLS_SSL_MAX_FRAG_LEN_1024:
+ return 1024;
+ case MBEDTLS_SSL_MAX_FRAG_LEN_2048:
+ return 2048;
+ case MBEDTLS_SSL_MAX_FRAG_LEN_4096:
+ return 4096;
+ default:
+ return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN );
+ }
+}
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+int mbedtls_ssl_session_copy( mbedtls_ssl_session *dst,
+ const mbedtls_ssl_session *src )
+{
+ mbedtls_ssl_session_free( dst );
+ memcpy( dst, src, sizeof( mbedtls_ssl_session ) );
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ if( src->peer_cert != NULL )
+ {
+ int ret;
+
+ dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) );
+ if( dst->peer_cert == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ mbedtls_x509_crt_init( dst->peer_cert );
+
+ if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
+ src->peer_cert->raw.len ) ) != 0 )
+ {
+ mbedtls_free( dst->peer_cert );
+ dst->peer_cert = NULL;
+ return( ret );
+ }
+ }
+#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ if( src->peer_cert_digest != NULL )
+ {
+ dst->peer_cert_digest =
+ mbedtls_calloc( 1, src->peer_cert_digest_len );
+ if( dst->peer_cert_digest == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ memcpy( dst->peer_cert_digest, src->peer_cert_digest,
+ src->peer_cert_digest_len );
+ dst->peer_cert_digest_type = src->peer_cert_digest_type;
+ dst->peer_cert_digest_len = src->peer_cert_digest_len;
+ }
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+ if( src->ticket != NULL )
+ {
+ dst->ticket = mbedtls_calloc( 1, src->ticket_len );
+ if( dst->ticket == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ memcpy( dst->ticket, src->ticket, src->ticket_len );
+ }
+#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl,
+ const unsigned char *key_enc, const unsigned char *key_dec,
+ size_t keylen,
+ const unsigned char *iv_enc, const unsigned char *iv_dec,
+ size_t ivlen,
+ const unsigned char *mac_enc, const unsigned char *mac_dec,
+ size_t maclen ) = NULL;
+int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL;
+int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL;
+int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL;
+int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL;
+int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL;
+#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
+
+/*
+ * Key material generation
+ */
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+static int ssl3_prf( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ int ret = 0;
+ size_t i;
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+ unsigned char padding[16];
+ unsigned char sha1sum[20];
+ ((void)label);
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ /*
+ * SSLv3:
+ * block =
+ * MD5( secret + SHA1( 'A' + secret + random ) ) +
+ * MD5( secret + SHA1( 'BB' + secret + random ) ) +
+ * MD5( secret + SHA1( 'CCC' + secret + random ) ) +
+ * ...
+ */
+ for( i = 0; i < dlen / 16; i++ )
+ {
+ memset( padding, (unsigned char) ('A' + i), 1 + i );
+
+ if( ( ret = mbedtls_sha1_starts_ret( &sha1 ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_sha1_update_ret( &sha1, padding, 1 + i ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_sha1_update_ret( &sha1, secret, slen ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_sha1_update_ret( &sha1, random, rlen ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_sha1_finish_ret( &sha1, sha1sum ) ) != 0 )
+ goto exit;
+
+ if( ( ret = mbedtls_md5_starts_ret( &md5 ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_md5_update_ret( &md5, secret, slen ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_md5_update_ret( &md5, sha1sum, 20 ) ) != 0 )
+ goto exit;
+ if( ( ret = mbedtls_md5_finish_ret( &md5, dstbuf + i * 16 ) ) != 0 )
+ goto exit;
+ }
+
+exit:
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ mbedtls_platform_zeroize( padding, sizeof( padding ) );
+ mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) );
+
+ return( ret );
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static int tls1_prf( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ size_t nb, hs;
+ size_t i, j, k;
+ const unsigned char *S1, *S2;
+ unsigned char tmp[128];
+ unsigned char h_i[20];
+ const mbedtls_md_info_t *md_info;
+ mbedtls_md_context_t md_ctx;
+ int ret;
+
+ mbedtls_md_init( &md_ctx );
+
+ if( sizeof( tmp ) < 20 + strlen( label ) + rlen )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ hs = ( slen + 1 ) / 2;
+ S1 = secret;
+ S2 = secret + slen - hs;
+
+ nb = strlen( label );
+ memcpy( tmp + 20, label, nb );
+ memcpy( tmp + 20 + nb, random, rlen );
+ nb += rlen;
+
+ /*
+ * First compute P_md5(secret,label+random)[0..dlen]
+ */
+ if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL )
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+
+ if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
+ return( ret );
+
+ mbedtls_md_hmac_starts( &md_ctx, S1, hs );
+ mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
+ mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
+
+ for( i = 0; i < dlen; i += 16 )
+ {
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb );
+ mbedtls_md_hmac_finish( &md_ctx, h_i );
+
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 );
+ mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
+
+ k = ( i + 16 > dlen ) ? dlen % 16 : 16;
+
+ for( j = 0; j < k; j++ )
+ dstbuf[i + j] = h_i[j];
+ }
+
+ mbedtls_md_free( &md_ctx );
+
+ /*
+ * XOR out with P_sha1(secret,label+random)[0..dlen]
+ */
+ if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL )
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+
+ if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
+ return( ret );
+
+ mbedtls_md_hmac_starts( &md_ctx, S2, hs );
+ mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
+ mbedtls_md_hmac_finish( &md_ctx, tmp );
+
+ for( i = 0; i < dlen; i += 20 )
+ {
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb );
+ mbedtls_md_hmac_finish( &md_ctx, h_i );
+
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, tmp, 20 );
+ mbedtls_md_hmac_finish( &md_ctx, tmp );
+
+ k = ( i + 20 > dlen ) ? dlen % 20 : 20;
+
+ for( j = 0; j < k; j++ )
+ dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
+ }
+
+ mbedtls_md_free( &md_ctx );
+
+ mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
+ mbedtls_platform_zeroize( h_i, sizeof( h_i ) );
+
+ return( 0 );
+}
+#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+static int tls_prf_generic( mbedtls_md_type_t md_type,
+ const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ psa_status_t status;
+ psa_algorithm_t alg;
+ psa_key_policy_t policy;
+ psa_key_handle_t master_slot;
+ psa_crypto_generator_t generator = PSA_CRYPTO_GENERATOR_INIT;
+
+ if( ( status = psa_allocate_key( &master_slot ) ) != PSA_SUCCESS )
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+
+ if( md_type == MBEDTLS_MD_SHA384 )
+ alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_384);
+ else
+ alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256);
+
+ policy = psa_key_policy_init();
+ psa_key_policy_set_usage( &policy,
+ PSA_KEY_USAGE_DERIVE,
+ alg );
+ status = psa_set_key_policy( master_slot, &policy );
+ if( status != PSA_SUCCESS )
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+
+ status = psa_import_key( master_slot, PSA_KEY_TYPE_DERIVE, secret, slen );
+ if( status != PSA_SUCCESS )
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+
+ status = psa_key_derivation( &generator,
+ master_slot, alg,
+ random, rlen,
+ (unsigned char const *) label,
+ (size_t) strlen( label ),
+ dlen );
+ if( status != PSA_SUCCESS )
+ {
+ psa_generator_abort( &generator );
+ psa_destroy_key( master_slot );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_generator_read( &generator, dstbuf, dlen );
+ if( status != PSA_SUCCESS )
+ {
+ psa_generator_abort( &generator );
+ psa_destroy_key( master_slot );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_generator_abort( &generator );
+ if( status != PSA_SUCCESS )
+ {
+ psa_destroy_key( master_slot );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_destroy_key( master_slot );
+ if( status != PSA_SUCCESS )
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+
+ return( 0 );
+}
+
+#else /* MBEDTLS_USE_PSA_CRYPTO */
+
+static int tls_prf_generic( mbedtls_md_type_t md_type,
+ const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ size_t nb;
+ size_t i, j, k, md_len;
+ unsigned char tmp[128];
+ unsigned char h_i[MBEDTLS_MD_MAX_SIZE];
+ const mbedtls_md_info_t *md_info;
+ mbedtls_md_context_t md_ctx;
+ int ret;
+
+ mbedtls_md_init( &md_ctx );
+
+ if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL )
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+
+ md_len = mbedtls_md_get_size( md_info );
+
+ if( sizeof( tmp ) < md_len + strlen( label ) + rlen )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ nb = strlen( label );
+ memcpy( tmp + md_len, label, nb );
+ memcpy( tmp + md_len + nb, random, rlen );
+ nb += rlen;
+
+ /*
+ * Compute P_<hash>(secret, label + random)[0..dlen]
+ */
+ if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
+ return( ret );
+
+ mbedtls_md_hmac_starts( &md_ctx, secret, slen );
+ mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
+ mbedtls_md_hmac_finish( &md_ctx, tmp );
+
+ for( i = 0; i < dlen; i += md_len )
+ {
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
+ mbedtls_md_hmac_finish( &md_ctx, h_i );
+
+ mbedtls_md_hmac_reset ( &md_ctx );
+ mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
+ mbedtls_md_hmac_finish( &md_ctx, tmp );
+
+ k = ( i + md_len > dlen ) ? dlen % md_len : md_len;
+
+ for( j = 0; j < k; j++ )
+ dstbuf[i + j] = h_i[j];
+ }
+
+ mbedtls_md_free( &md_ctx );
+
+ mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
+ mbedtls_platform_zeroize( h_i, sizeof( h_i ) );
+
+ return( 0 );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+#if defined(MBEDTLS_SHA256_C)
+static int tls_prf_sha256( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen,
+ label, random, rlen, dstbuf, dlen ) );
+}
+#endif /* MBEDTLS_SHA256_C */
+
+#if defined(MBEDTLS_SHA512_C)
+static int tls_prf_sha384( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen,
+ label, random, rlen, dstbuf, dlen ) );
+}
+#endif /* MBEDTLS_SHA512_C */
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t );
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t );
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+static void ssl_calc_verify_ssl( mbedtls_ssl_context *, unsigned char * );
+static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int );
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static void ssl_calc_verify_tls( mbedtls_ssl_context *, unsigned char * );
+static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int );
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
+static void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *,unsigned char * );
+static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
+#endif
+
+#if defined(MBEDTLS_SHA512_C)
+static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
+static void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *, unsigned char * );
+static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) && \
+ defined(MBEDTLS_USE_PSA_CRYPTO)
+static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl )
+{
+ if( ssl->conf->f_psk != NULL )
+ {
+ /* If we've used a callback to select the PSK,
+ * the static configuration is irrelevant. */
+ if( ssl->handshake->psk_opaque != 0 )
+ return( 1 );
+
+ return( 0 );
+ }
+
+ if( ssl->conf->psk_opaque != 0 )
+ return( 1 );
+
+ return( 0 );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO &&
+ MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
+
+int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ int psa_fallthrough;
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ unsigned char tmp[64];
+ unsigned char keyblk[256];
+ unsigned char *key1;
+ unsigned char *key2;
+ unsigned char *mac_enc;
+ unsigned char *mac_dec;
+ size_t mac_key_len;
+ size_t iv_copy_len;
+ size_t taglen = 0;
+ const mbedtls_cipher_info_t *cipher_info;
+ const mbedtls_md_info_t *md_info;
+
+ /* cf. RFC 5246, Section 8.1:
+ * "The master secret is always exactly 48 bytes in length." */
+ size_t const master_secret_len = 48;
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+ unsigned char session_hash[48];
+#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ mbedtls_ssl_transform *transform = ssl->transform_negotiate;
+ mbedtls_ssl_handshake_params *handshake = ssl->handshake;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
+
+ cipher_info = mbedtls_cipher_info_from_type( transform->ciphersuite_info->cipher );
+ if( cipher_info == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found",
+ transform->ciphersuite_info->cipher ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ md_info = mbedtls_md_info_from_type( transform->ciphersuite_info->mac );
+ if( md_info == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found",
+ transform->ciphersuite_info->mac ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ /*
+ * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions
+ */
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ handshake->tls_prf = ssl3_prf;
+ handshake->calc_verify = ssl_calc_verify_ssl;
+ handshake->calc_finished = ssl_calc_finished_ssl;
+ }
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ handshake->tls_prf = tls1_prf;
+ handshake->calc_verify = ssl_calc_verify_tls;
+ handshake->calc_finished = ssl_calc_finished_tls;
+ }
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA512_C)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
+ transform->ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
+ {
+ handshake->tls_prf = tls_prf_sha384;
+ handshake->calc_verify = ssl_calc_verify_tls_sha384;
+ handshake->calc_finished = ssl_calc_finished_tls_sha384;
+ }
+ else
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ handshake->tls_prf = tls_prf_sha256;
+ handshake->calc_verify = ssl_calc_verify_tls_sha256;
+ handshake->calc_finished = ssl_calc_finished_tls_sha256;
+ }
+ else
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /*
+ * SSLv3:
+ * master =
+ * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
+ * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
+ * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
+ *
+ * TLSv1+:
+ * master = PRF( premaster, "master secret", randbytes )[0..47]
+ */
+ if( handshake->resume != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
+ }
+ else
+ {
+ /* The label for the KDF used for key expansion.
+ * This is either "master secret" or "extended master secret"
+ * depending on whether the Extended Master Secret extension
+ * is used. */
+ char const *lbl = "master secret";
+
+ /* The salt for the KDF used for key expansion.
+ * - If the Extended Master Secret extension is not used,
+ * this is ClientHello.Random + ServerHello.Random
+ * (see Sect. 8.1 in RFC 5246).
+ * - If the Extended Master Secret extension is used,
+ * this is the transcript of the handshake so far.
+ * (see Sect. 4 in RFC 7627). */
+ unsigned char const *salt = handshake->randbytes;
+ size_t salt_len = 64;
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
+ ssl->transform_negotiate->ciphersuite_info;
+ mbedtls_md_type_t const md_type = ciphersuite_info->mac;
+#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+ if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
+
+ lbl = "extended master secret";
+ salt = session_hash;
+ ssl->handshake->calc_verify( ssl, session_hash );
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+#if defined(MBEDTLS_SHA512_C)
+ if( md_type == MBEDTLS_MD_SHA384 )
+ salt_len = 48;
+ else
+#endif /* MBEDTLS_SHA512_C */
+ salt_len = 32;
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+ salt_len = 36;
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, salt_len );
+ }
+#endif /* MBEDTLS_SSL_EXTENDED_MS_ENABLED */
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO) && \
+ defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
+ if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK &&
+ ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
+ ssl_use_opaque_psk( ssl ) == 1 )
+ {
+ /* Perform PSK-to-MS expansion in a single step. */
+ psa_status_t status;
+ psa_algorithm_t alg;
+ psa_crypto_generator_t generator = PSA_CRYPTO_GENERATOR_INIT;
+ psa_key_handle_t psk;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "perform PSA-based PSK-to-MS expansion" ) );
+
+ psk = ssl->conf->psk_opaque;
+ if( ssl->handshake->psk_opaque != 0 )
+ psk = ssl->handshake->psk_opaque;
+
+ if( md_type == MBEDTLS_MD_SHA384 )
+ alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384);
+ else
+ alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256);
+
+ status = psa_key_derivation( &generator, psk, alg,
+ salt, salt_len,
+ (unsigned char const *) lbl,
+ (size_t) strlen( lbl ),
+ master_secret_len );
+ if( status != PSA_SUCCESS )
+ {
+ psa_generator_abort( &generator );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_generator_read( &generator, session->master,
+ master_secret_len );
+ if( status != PSA_SUCCESS )
+ {
+ psa_generator_abort( &generator );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ status = psa_generator_abort( &generator );
+ if( status != PSA_SUCCESS )
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ else
+#endif
+ {
+ ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
+ lbl, salt, salt_len,
+ session->master,
+ master_secret_len );
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret",
+ handshake->premaster,
+ handshake->pmslen );
+
+ mbedtls_platform_zeroize( handshake->premaster,
+ sizeof(handshake->premaster) );
+ }
+ }
+
+ /*
+ * Swap the client and server random values.
+ */
+ memcpy( tmp, handshake->randbytes, 64 );
+ memcpy( handshake->randbytes, tmp + 32, 32 );
+ memcpy( handshake->randbytes + 32, tmp, 32 );
+ mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
+
+ /*
+ * SSLv3:
+ * key block =
+ * MD5( master + SHA1( 'A' + master + randbytes ) ) +
+ * MD5( master + SHA1( 'BB' + master + randbytes ) ) +
+ * MD5( master + SHA1( 'CCC' + master + randbytes ) ) +
+ * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) +
+ * ...
+ *
+ * TLSv1:
+ * key block = PRF( master, "key expansion", randbytes )
+ */
+ ret = handshake->tls_prf( session->master, 48, "key expansion",
+ handshake->randbytes, 64, keyblk, 256 );
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
+ mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) );
+ MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
+
+ mbedtls_platform_zeroize( handshake->randbytes,
+ sizeof( handshake->randbytes ) );
+
+ /*
+ * Determine the appropriate key, IV and MAC length.
+ */
+
+ transform->keylen = cipher_info->key_bitlen / 8;
+
+ if( cipher_info->mode == MBEDTLS_MODE_GCM ||
+ cipher_info->mode == MBEDTLS_MODE_CCM ||
+ cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY )
+ {
+ size_t explicit_ivlen;
+
+ transform->maclen = 0;
+ mac_key_len = 0;
+
+ /* All modes haves 96-bit IVs;
+ * GCM and CCM has 4 implicit and 8 explicit bytes
+ * ChachaPoly has all 12 bytes implicit
+ */
+ transform->ivlen = 12;
+ if( cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY )
+ transform->fixed_ivlen = 12;
+ else
+ transform->fixed_ivlen = 4;
+
+ /* All modes have 128-bit tags, except CCM_8 (ciphersuite flag) */
+ taglen = transform->ciphersuite_info->flags &
+ MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
+
+
+ /* Minimum length of encrypted record */
+ explicit_ivlen = transform->ivlen - transform->fixed_ivlen;
+ transform->minlen = explicit_ivlen + taglen;
+ }
+ else
+ {
+ /* Initialize HMAC contexts */
+ if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
+ ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
+ return( ret );
+ }
+
+ /* Get MAC length */
+ mac_key_len = mbedtls_md_get_size( md_info );
+ transform->maclen = mac_key_len;
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+ /*
+ * If HMAC is to be truncated, we shall keep the leftmost bytes,
+ * (rfc 6066 page 13 or rfc 2104 section 4),
+ * so we only need to adjust the length here.
+ */
+ if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
+ {
+ transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT)
+ /* Fall back to old, non-compliant version of the truncated
+ * HMAC implementation which also truncates the key
+ * (Mbed TLS versions from 1.3 to 2.6.0) */
+ mac_key_len = transform->maclen;
+#endif
+ }
+#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
+
+ /* IV length */
+ transform->ivlen = cipher_info->iv_size;
+
+ /* Minimum length */
+ if( cipher_info->mode == MBEDTLS_MODE_STREAM )
+ transform->minlen = transform->maclen;
+ else
+ {
+ /*
+ * GenericBlockCipher:
+ * 1. if EtM is in use: one block plus MAC
+ * otherwise: * first multiple of blocklen greater than maclen
+ * 2. IV except for SSL3 and TLS 1.0
+ */
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
+ {
+ transform->minlen = transform->maclen
+ + cipher_info->block_size;
+ }
+ else
+#endif
+ {
+ transform->minlen = transform->maclen
+ + cipher_info->block_size
+ - transform->maclen % cipher_info->block_size;
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
+ ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 )
+ ; /* No need to adjust minlen */
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 ||
+ ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ transform->minlen += transform->ivlen;
+ }
+ else
+#endif
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
+ transform->keylen, transform->minlen, transform->ivlen,
+ transform->maclen ) );
+
+ /*
+ * Finally setup the cipher contexts, IVs and MAC secrets.
+ */
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ {
+ key1 = keyblk + mac_key_len * 2;
+ key2 = keyblk + mac_key_len * 2 + transform->keylen;
+
+ mac_enc = keyblk;
+ mac_dec = keyblk + mac_key_len;
+
+ /*
+ * This is not used in TLS v1.1.
+ */
+ iv_copy_len = ( transform->fixed_ivlen ) ?
+ transform->fixed_ivlen : transform->ivlen;
+ memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len );
+ memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len,
+ iv_copy_len );
+ }
+ else
+#endif /* MBEDTLS_SSL_CLI_C */
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ key1 = keyblk + mac_key_len * 2 + transform->keylen;
+ key2 = keyblk + mac_key_len * 2;
+
+ mac_enc = keyblk + mac_key_len;
+ mac_dec = keyblk;
+
+ /*
+ * This is not used in TLS v1.1.
+ */
+ iv_copy_len = ( transform->fixed_ivlen ) ?
+ transform->fixed_ivlen : transform->ivlen;
+ memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len );
+ memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len,
+ iv_copy_len );
+ }
+ else
+#endif /* MBEDTLS_SSL_SRV_C */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ if( mac_key_len > sizeof transform->mac_enc )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ memcpy( transform->mac_enc, mac_enc, mac_key_len );
+ memcpy( transform->mac_dec, mac_dec, mac_key_len );
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
+ {
+ /* For HMAC-based ciphersuites, initialize the HMAC transforms.
+ For AEAD-based ciphersuites, there is nothing to do here. */
+ if( mac_key_len != 0 )
+ {
+ mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len );
+ mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len );
+ }
+ }
+ else
+#endif
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_init != NULL )
+ {
+ int ret = 0;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) );
+
+ if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, transform->keylen,
+ transform->iv_enc, transform->iv_dec,
+ iv_copy_len,
+ mac_enc, mac_dec,
+ mac_key_len ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+ if( ssl->conf->f_export_keys != NULL )
+ {
+ ssl->conf->f_export_keys( ssl->conf->p_export_keys,
+ session->master, keyblk,
+ mac_key_len, transform->keylen,
+ iv_copy_len );
+ }
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+
+ /* Only use PSA-based ciphers for TLS-1.2.
+ * That's relevant at least for TLS-1.0, where
+ * we assume that mbedtls_cipher_crypt() updates
+ * the structure field for the IV, which the PSA-based
+ * implementation currently doesn't. */
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_enc,
+ cipher_info, taglen );
+ if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret );
+ return( ret );
+ }
+
+ if( ret == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based encryption cipher context" ) );
+ psa_fallthrough = 0;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record encryption - fall through to default setup." ) );
+ psa_fallthrough = 1;
+ }
+ }
+ else
+ psa_fallthrough = 1;
+#else
+ psa_fallthrough = 1;
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ if( psa_fallthrough == 1 )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
+ cipher_info ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
+ return( ret );
+ }
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ /* Only use PSA-based ciphers for TLS-1.2.
+ * That's relevant at least for TLS-1.0, where
+ * we assume that mbedtls_cipher_crypt() updates
+ * the structure field for the IV, which the PSA-based
+ * implementation currently doesn't. */
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
+ {
+ ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_dec,
+ cipher_info, taglen );
+ if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret );
+ return( ret );
+ }
+
+ if( ret == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based decryption cipher context" ) );
+ psa_fallthrough = 0;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record decryption - fall through to default setup." ) );
+ psa_fallthrough = 1;
+ }
+ }
+ else
+ psa_fallthrough = 1;
+#else
+ psa_fallthrough = 1;
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ if( psa_fallthrough == 1 )
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
+ cipher_info ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
+ return( ret );
+ }
+
+ if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1,
+ cipher_info->key_bitlen,
+ MBEDTLS_ENCRYPT ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
+ return( ret );
+ }
+
+ if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2,
+ cipher_info->key_bitlen,
+ MBEDTLS_DECRYPT ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
+ return( ret );
+ }
+
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+ if( cipher_info->mode == MBEDTLS_MODE_CBC )
+ {
+ if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc,
+ MBEDTLS_PADDING_NONE ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
+ return( ret );
+ }
+
+ if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec,
+ MBEDTLS_PADDING_NONE ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
+ return( ret );
+ }
+ }
+#endif /* MBEDTLS_CIPHER_MODE_CBC */
+
+ mbedtls_platform_zeroize( keyblk, sizeof( keyblk ) );
+
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ // Initialize compression
+ //
+ if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
+ {
+ if( ssl->compress_buf == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
+ ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_COMPRESS_BUFFER_LEN );
+ if( ssl->compress_buf == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
+ MBEDTLS_SSL_COMPRESS_BUFFER_LEN ) );
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ }
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
+
+ memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
+ memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) );
+
+ if( deflateInit( &transform->ctx_deflate,
+ Z_DEFAULT_COMPRESSION ) != Z_OK ||
+ inflateInit( &transform->ctx_inflate ) != Z_OK )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) );
+ return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
+ }
+ }
+#endif /* MBEDTLS_ZLIB_SUPPORT */
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+void ssl_calc_verify_ssl( mbedtls_ssl_context *ssl, unsigned char hash[36] )
+{
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+ unsigned char pad_1[48];
+ unsigned char pad_2[48];
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) );
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
+ mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
+
+ memset( pad_1, 0x36, 48 );
+ memset( pad_2, 0x5C, 48 );
+
+ mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 );
+ mbedtls_md5_update_ret( &md5, pad_1, 48 );
+ mbedtls_md5_finish_ret( &md5, hash );
+
+ mbedtls_md5_starts_ret( &md5 );
+ mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 );
+ mbedtls_md5_update_ret( &md5, pad_2, 48 );
+ mbedtls_md5_update_ret( &md5, hash, 16 );
+ mbedtls_md5_finish_ret( &md5, hash );
+
+ mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 );
+ mbedtls_sha1_update_ret( &sha1, pad_1, 40 );
+ mbedtls_sha1_finish_ret( &sha1, hash + 16 );
+
+ mbedtls_sha1_starts_ret( &sha1 );
+ mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 );
+ mbedtls_sha1_update_ret( &sha1, pad_2, 40 );
+ mbedtls_sha1_update_ret( &sha1, hash + 16, 20 );
+ mbedtls_sha1_finish_ret( &sha1, hash + 16 );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ return;
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+void ssl_calc_verify_tls( mbedtls_ssl_context *ssl, unsigned char hash[36] )
+{
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) );
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
+ mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
+
+ mbedtls_md5_finish_ret( &md5, hash );
+ mbedtls_sha1_finish_ret( &sha1, hash + 16 );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ return;
+}
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *ssl, unsigned char hash[32] )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ size_t hash_size;
+ psa_status_t status;
+ psa_hash_operation_t sha256_psa = psa_hash_operation_init();
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> PSA calc verify sha256" ) );
+ status = psa_hash_clone( &ssl->handshake->fin_sha256_psa, &sha256_psa );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) );
+ return;
+ }
+
+ status = psa_hash_finish( &sha256_psa, hash, 32, &hash_size );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) );
+ return;
+ }
+ MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, 32 );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) );
+#else
+ mbedtls_sha256_context sha256;
+
+ mbedtls_sha256_init( &sha256 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) );
+
+ mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
+ mbedtls_sha256_finish_ret( &sha256, hash );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ mbedtls_sha256_free( &sha256 );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ return;
+}
+#endif /* MBEDTLS_SHA256_C */
+
+#if defined(MBEDTLS_SHA512_C)
+void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *ssl, unsigned char hash[48] )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ size_t hash_size;
+ psa_status_t status;
+ psa_hash_operation_t sha384_psa = psa_hash_operation_init();
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> PSA calc verify sha384" ) );
+ status = psa_hash_clone( &ssl->handshake->fin_sha384_psa, &sha384_psa );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) );
+ return;
+ }
+
+ status = psa_hash_finish( &sha384_psa, hash, 48, &hash_size );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) );
+ return;
+ }
+ MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, 48 );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) );
+#else
+ mbedtls_sha512_context sha512;
+
+ mbedtls_sha512_init( &sha512 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) );
+
+ mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
+ mbedtls_sha512_finish_ret( &sha512, hash );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 );
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ mbedtls_sha512_free( &sha512 );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ return;
+}
+#endif /* MBEDTLS_SHA512_C */
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
+int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex )
+{
+ unsigned char *p = ssl->handshake->premaster;
+ unsigned char *end = p + sizeof( ssl->handshake->premaster );
+ const unsigned char *psk = ssl->conf->psk;
+ size_t psk_len = ssl->conf->psk_len;
+
+ /* If the psk callback was called, use its result */
+ if( ssl->handshake->psk != NULL )
+ {
+ psk = ssl->handshake->psk;
+ psk_len = ssl->handshake->psk_len;
+ }
+
+ /*
+ * PMS = struct {
+ * opaque other_secret<0..2^16-1>;
+ * opaque psk<0..2^16-1>;
+ * };
+ * with "other_secret" depending on the particular key exchange
+ */
+#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
+ if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
+ {
+ if( end - p < 2 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ *(p++) = (unsigned char)( psk_len >> 8 );
+ *(p++) = (unsigned char)( psk_len );
+
+ if( end < p || (size_t)( end - p ) < psk_len )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ memset( p, 0, psk_len );
+ p += psk_len;
+ }
+ else
+#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
+#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
+ if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
+ {
+ /*
+ * other_secret already set by the ClientKeyExchange message,
+ * and is 48 bytes long
+ */
+ if( end - p < 2 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ *p++ = 0;
+ *p++ = 48;
+ p += 48;
+ }
+ else
+#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
+#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
+ if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
+ {
+ int ret;
+ size_t len;
+
+ /* Write length only when we know the actual value */
+ if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
+ p + 2, end - ( p + 2 ), &len,
+ ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
+ return( ret );
+ }
+ *(p++) = (unsigned char)( len >> 8 );
+ *(p++) = (unsigned char)( len );
+ p += len;
+
+ MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
+ }
+ else
+#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
+#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
+ if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
+ {
+ int ret;
+ size_t zlen;
+
+ if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
+ p + 2, end - ( p + 2 ),
+ ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
+ return( ret );
+ }
+
+ *(p++) = (unsigned char)( zlen >> 8 );
+ *(p++) = (unsigned char)( zlen );
+ p += zlen;
+
+ MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
+ MBEDTLS_DEBUG_ECDH_Z );
+ }
+ else
+#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /* opaque psk<0..2^16-1>; */
+ if( end - p < 2 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ *(p++) = (unsigned char)( psk_len >> 8 );
+ *(p++) = (unsigned char)( psk_len );
+
+ if( end < p || (size_t)( end - p ) < psk_len )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ memcpy( p, psk, psk_len );
+ p += psk_len;
+
+ ssl->handshake->pmslen = p - ssl->handshake->premaster;
+
+ return( 0 );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+/*
+ * SSLv3.0 MAC functions
+ */
+#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */
+static void ssl_mac( mbedtls_md_context_t *md_ctx,
+ const unsigned char *secret,
+ const unsigned char *buf, size_t len,
+ const unsigned char *ctr, int type,
+ unsigned char out[SSL_MAC_MAX_BYTES] )
+{
+ unsigned char header[11];
+ unsigned char padding[48];
+ int padlen;
+ int md_size = mbedtls_md_get_size( md_ctx->md_info );
+ int md_type = mbedtls_md_get_type( md_ctx->md_info );
+
+ /* Only MD5 and SHA-1 supported */
+ if( md_type == MBEDTLS_MD_MD5 )
+ padlen = 48;
+ else
+ padlen = 40;
+
+ memcpy( header, ctr, 8 );
+ header[ 8] = (unsigned char) type;
+ header[ 9] = (unsigned char)( len >> 8 );
+ header[10] = (unsigned char)( len );
+
+ memset( padding, 0x36, padlen );
+ mbedtls_md_starts( md_ctx );
+ mbedtls_md_update( md_ctx, secret, md_size );
+ mbedtls_md_update( md_ctx, padding, padlen );
+ mbedtls_md_update( md_ctx, header, 11 );
+ mbedtls_md_update( md_ctx, buf, len );
+ mbedtls_md_finish( md_ctx, out );
+
+ memset( padding, 0x5C, padlen );
+ mbedtls_md_starts( md_ctx );
+ mbedtls_md_update( md_ctx, secret, md_size );
+ mbedtls_md_update( md_ctx, padding, padlen );
+ mbedtls_md_update( md_ctx, out, md_size );
+ mbedtls_md_finish( md_ctx, out );
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \
+ ( defined(MBEDTLS_CIPHER_MODE_CBC) && \
+ ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) || defined(MBEDTLS_ARIA_C)) )
+#define SSL_SOME_MODES_USE_MAC
+#endif
+
+/* The function below is only used in the Lucky 13 counter-measure in
+ * ssl_decrypt_buf(). These are the defines that guard the call site. */
+#if defined(SSL_SOME_MODES_USE_MAC) && \
+ ( defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2) )
+/* This function makes sure every byte in the memory region is accessed
+ * (in ascending addresses order) */
+static void ssl_read_memory( unsigned char *p, size_t len )
+{
+ unsigned char acc = 0;
+ volatile unsigned char force;
+
+ for( ; len != 0; p++, len-- )
+ acc ^= *p;
+
+ force = acc;
+ (void) force;
+}
+#endif /* SSL_SOME_MODES_USE_MAC && ( TLS1 || TLS1_1 || TLS1_2 ) */
+
+/*
+ * Encryption/decryption functions
+ */
+static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
+{
+ mbedtls_cipher_mode_t mode;
+ int auth_done = 0;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
+
+ if( ssl->session_out == NULL || ssl->transform_out == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
+ ssl->out_msg, ssl->out_msglen );
+
+ /*
+ * Add MAC before if needed
+ */
+#if defined(SSL_SOME_MODES_USE_MAC)
+ if( mode == MBEDTLS_MODE_STREAM ||
+ ( mode == MBEDTLS_MODE_CBC
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ && ssl->session_out->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED
+#endif
+ ) )
+ {
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ unsigned char mac[SSL_MAC_MAX_BYTES];
+
+ ssl_mac( &ssl->transform_out->md_ctx_enc,
+ ssl->transform_out->mac_enc,
+ ssl->out_msg, ssl->out_msglen,
+ ssl->out_ctr, ssl->out_msgtype,
+ mac );
+
+ memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
+ }
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
+ {
+ unsigned char mac[MBEDTLS_SSL_MAC_ADD];
+
+ mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 8 );
+ mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_hdr, 3 );
+ mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_len, 2 );
+ mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
+ ssl->out_msg, ssl->out_msglen );
+ mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac );
+ mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
+
+ memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
+ }
+ else
+#endif
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac",
+ ssl->out_msg + ssl->out_msglen,
+ ssl->transform_out->maclen );
+
+ ssl->out_msglen += ssl->transform_out->maclen;
+ auth_done++;
+ }
+#endif /* AEAD not the only option */
+
+ /*
+ * Encrypt
+ */
+#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
+ if( mode == MBEDTLS_MODE_STREAM )
+ {
+ int ret;
+ size_t olen = 0;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
+ "including %d bytes of padding",
+ ssl->out_msglen, 0 ) );
+
+ if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
+ ssl->transform_out->iv_enc,
+ ssl->transform_out->ivlen,
+ ssl->out_msg, ssl->out_msglen,
+ ssl->out_msg, &olen ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
+ return( ret );
+ }
+
+ if( ssl->out_msglen != olen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ else
+#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
+#if defined(MBEDTLS_GCM_C) || \
+ defined(MBEDTLS_CCM_C) || \
+ defined(MBEDTLS_CHACHAPOLY_C)
+ if( mode == MBEDTLS_MODE_GCM ||
+ mode == MBEDTLS_MODE_CCM ||
+ mode == MBEDTLS_MODE_CHACHAPOLY )
+ {
+ int ret;
+ size_t enc_msglen, olen;
+ unsigned char *enc_msg;
+ unsigned char add_data[13];
+ unsigned char iv[12];
+ mbedtls_ssl_transform *transform = ssl->transform_out;
+ unsigned char taglen = transform->ciphersuite_info->flags &
+ MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
+ size_t explicit_ivlen = transform->ivlen - transform->fixed_ivlen;
+
+ /*
+ * Prepare additional authenticated data
+ */
+ memcpy( add_data, ssl->out_ctr, 8 );
+ add_data[8] = ssl->out_msgtype;
+ mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
+ ssl->conf->transport, add_data + 9 );
+ add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF;
+ add_data[12] = ssl->out_msglen & 0xFF;
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "additional data for AEAD", add_data, 13 );
+
+ /*
+ * Generate IV
+ */
+ if( transform->ivlen == 12 && transform->fixed_ivlen == 4 )
+ {
+ /* GCM and CCM: fixed || explicit (=seqnum) */
+ memcpy( iv, transform->iv_enc, transform->fixed_ivlen );
+ memcpy( iv + transform->fixed_ivlen, ssl->out_ctr, 8 );
+ memcpy( ssl->out_iv, ssl->out_ctr, 8 );
+
+ }
+ else if( transform->ivlen == 12 && transform->fixed_ivlen == 12 )
+ {
+ /* ChachaPoly: fixed XOR sequence number */
+ unsigned char i;
+
+ memcpy( iv, transform->iv_enc, transform->fixed_ivlen );
+
+ for( i = 0; i < 8; i++ )
+ iv[i+4] ^= ssl->out_ctr[i];
+ }
+ else
+ {
+ /* Reminder if we ever add an AEAD mode with a different size */
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "IV used (internal)",
+ iv, transform->ivlen );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "IV used (transmitted)",
+ ssl->out_iv, explicit_ivlen );
+
+ /*
+ * Fix message length with added IV
+ */
+ enc_msg = ssl->out_msg;
+ enc_msglen = ssl->out_msglen;
+ ssl->out_msglen += explicit_ivlen;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
+ "including 0 bytes of padding",
+ ssl->out_msglen ) );
+
+ /*
+ * Encrypt and authenticate
+ */
+ if( ( ret = mbedtls_cipher_auth_encrypt( &transform->cipher_ctx_enc,
+ iv, transform->ivlen,
+ add_data, 13,
+ enc_msg, enc_msglen,
+ enc_msg, &olen,
+ enc_msg + enc_msglen, taglen ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret );
+ return( ret );
+ }
+
+ if( olen != enc_msglen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ ssl->out_msglen += taglen;
+ auth_done++;
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen );
+ }
+ else
+#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
+#if defined(MBEDTLS_CIPHER_MODE_CBC) && \
+ ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) || defined(MBEDTLS_ARIA_C) )
+ if( mode == MBEDTLS_MODE_CBC )
+ {
+ int ret;
+ unsigned char *enc_msg;
+ size_t enc_msglen, padlen, olen = 0, i;
+
+ padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) %
+ ssl->transform_out->ivlen;
+ if( padlen == ssl->transform_out->ivlen )
+ padlen = 0;
+
+ for( i = 0; i <= padlen; i++ )
+ ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen;
+
+ ssl->out_msglen += padlen + 1;
+
+ enc_msglen = ssl->out_msglen;
+ enc_msg = ssl->out_msg;
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ /*
+ * Prepend per-record IV for block cipher in TLS v1.1 and up as per
+ * Method 1 (6.2.3.2. in RFC4346 and RFC5246)
+ */
+ if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
+ {
+ /*
+ * Generate IV
+ */
+ ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
+ ssl->transform_out->ivlen );
+ if( ret != 0 )
+ return( ret );
+
+ memcpy( ssl->out_iv, ssl->transform_out->iv_enc,
+ ssl->transform_out->ivlen );
+
+ /*
+ * Fix pointer positions and message length with added IV
+ */
+ enc_msg = ssl->out_msg;
+ enc_msglen = ssl->out_msglen;
+ ssl->out_msglen += ssl->transform_out->ivlen;
+ }
+#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
+ "including %d bytes of IV and %d bytes of padding",
+ ssl->out_msglen, ssl->transform_out->ivlen,
+ padlen + 1 ) );
+
+ if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
+ ssl->transform_out->iv_enc,
+ ssl->transform_out->ivlen,
+ enc_msg, enc_msglen,
+ enc_msg, &olen ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
+ return( ret );
+ }
+
+ if( enc_msglen != olen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
+ if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
+ {
+ /*
+ * Save IV in SSL3 and TLS1
+ */
+ memcpy( ssl->transform_out->iv_enc,
+ ssl->transform_out->cipher_ctx_enc.iv,
+ ssl->transform_out->ivlen );
+ }
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ if( auth_done == 0 )
+ {
+ unsigned char mac[MBEDTLS_SSL_MAC_ADD];
+
+ /*
+ * MAC(MAC_write_key, seq_num +
+ * TLSCipherText.type +
+ * TLSCipherText.version +
+ * length_of( (IV +) ENC(...) ) +
+ * IV + // except for TLS 1.0
+ * ENC(content + padding + padding_length));
+ */
+ unsigned char pseudo_hdr[13];
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
+
+ memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 );
+ memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 );
+ pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF );
+ pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
+
+ mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 );
+ mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
+ ssl->out_iv, ssl->out_msglen );
+ mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac );
+ mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
+
+ memcpy( ssl->out_iv + ssl->out_msglen, mac,
+ ssl->transform_out->maclen );
+
+ ssl->out_msglen += ssl->transform_out->maclen;
+ auth_done++;
+ }
+#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
+ }
+ else
+#endif /* MBEDTLS_CIPHER_MODE_CBC &&
+ ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C || MBEDTLS_ARIA_C ) */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /* Make extra sure authentication was performed, exactly once */
+ if( auth_done != 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
+
+ return( 0 );
+}
+
+static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
+{
+ mbedtls_cipher_mode_t mode;
+ int auth_done = 0;
+#if defined(SSL_SOME_MODES_USE_MAC)
+ size_t padlen = 0, correct = 1;
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
+
+ if( ssl->session_in == NULL || ssl->transform_in == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec );
+
+ if( ssl->in_msglen < ssl->transform_in->minlen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
+ ssl->in_msglen, ssl->transform_in->minlen ) );
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+ }
+
+#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
+ if( mode == MBEDTLS_MODE_STREAM )
+ {
+ int ret;
+ size_t olen = 0;
+
+ padlen = 0;
+
+ if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
+ ssl->transform_in->iv_dec,
+ ssl->transform_in->ivlen,
+ ssl->in_msg, ssl->in_msglen,
+ ssl->in_msg, &olen ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
+ return( ret );
+ }
+
+ if( ssl->in_msglen != olen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ else
+#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
+#if defined(MBEDTLS_GCM_C) || \
+ defined(MBEDTLS_CCM_C) || \
+ defined(MBEDTLS_CHACHAPOLY_C)
+ if( mode == MBEDTLS_MODE_GCM ||
+ mode == MBEDTLS_MODE_CCM ||
+ mode == MBEDTLS_MODE_CHACHAPOLY )
+ {
+ int ret;
+ size_t dec_msglen, olen;
+ unsigned char *dec_msg;
+ unsigned char *dec_msg_result;
+ unsigned char add_data[13];
+ unsigned char iv[12];
+ mbedtls_ssl_transform *transform = ssl->transform_in;
+ unsigned char taglen = transform->ciphersuite_info->flags &
+ MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
+ size_t explicit_iv_len = transform->ivlen - transform->fixed_ivlen;
+
+ /*
+ * Compute and update sizes
+ */
+ if( ssl->in_msglen < explicit_iv_len + taglen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
+ "+ taglen (%d)", ssl->in_msglen,
+ explicit_iv_len, taglen ) );
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+ }
+ dec_msglen = ssl->in_msglen - explicit_iv_len - taglen;
+
+ dec_msg = ssl->in_msg;
+ dec_msg_result = ssl->in_msg;
+ ssl->in_msglen = dec_msglen;
+
+ /*
+ * Prepare additional authenticated data
+ */
+ memcpy( add_data, ssl->in_ctr, 8 );
+ add_data[8] = ssl->in_msgtype;
+ mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
+ ssl->conf->transport, add_data + 9 );
+ add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF;
+ add_data[12] = ssl->in_msglen & 0xFF;
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "additional data for AEAD", add_data, 13 );
+
+ /*
+ * Prepare IV
+ */
+ if( transform->ivlen == 12 && transform->fixed_ivlen == 4 )
+ {
+ /* GCM and CCM: fixed || explicit (transmitted) */
+ memcpy( iv, transform->iv_dec, transform->fixed_ivlen );
+ memcpy( iv + transform->fixed_ivlen, ssl->in_iv, 8 );
+
+ }
+ else if( transform->ivlen == 12 && transform->fixed_ivlen == 12 )
+ {
+ /* ChachaPoly: fixed XOR sequence number */
+ unsigned char i;
+
+ memcpy( iv, transform->iv_dec, transform->fixed_ivlen );
+
+ for( i = 0; i < 8; i++ )
+ iv[i+4] ^= ssl->in_ctr[i];
+ }
+ else
+ {
+ /* Reminder if we ever add an AEAD mode with a different size */
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", iv, transform->ivlen );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen );
+
+ /*
+ * Decrypt and authenticate
+ */
+ if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec,
+ iv, transform->ivlen,
+ add_data, 13,
+ dec_msg, dec_msglen,
+ dec_msg_result, &olen,
+ dec_msg + dec_msglen, taglen ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret );
+
+ if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+
+ return( ret );
+ }
+ auth_done++;
+
+ if( olen != dec_msglen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ else
+#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
+#if defined(MBEDTLS_CIPHER_MODE_CBC) && \
+ ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) || defined(MBEDTLS_ARIA_C) )
+ if( mode == MBEDTLS_MODE_CBC )
+ {
+ /*
+ * Decrypt and check the padding
+ */
+ int ret;
+ unsigned char *dec_msg;
+ unsigned char *dec_msg_result;
+ size_t dec_msglen;
+ size_t minlen = 0;
+ size_t olen = 0;
+
+ /*
+ * Check immediate ciphertext sanity
+ */
+#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
+ minlen += ssl->transform_in->ivlen;
+#endif
+
+ if( ssl->in_msglen < minlen + ssl->transform_in->ivlen ||
+ ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) "
+ "+ 1 ) ( + expl IV )", ssl->in_msglen,
+ ssl->transform_in->ivlen,
+ ssl->transform_in->maclen ) );
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+ }
+
+ dec_msglen = ssl->in_msglen;
+ dec_msg = ssl->in_msg;
+ dec_msg_result = ssl->in_msg;
+
+ /*
+ * Authenticate before decrypt if enabled
+ */
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ if( ssl->session_in->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
+ {
+ unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD];
+ unsigned char pseudo_hdr[13];
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
+
+ dec_msglen -= ssl->transform_in->maclen;
+ ssl->in_msglen -= ssl->transform_in->maclen;
+
+ memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 );
+ memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 );
+ pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF );
+ pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
+
+ mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 );
+ mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec,
+ ssl->in_iv, ssl->in_msglen );
+ mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect );
+ mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen,
+ ssl->transform_in->maclen );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect,
+ ssl->transform_in->maclen );
+
+ if( mbedtls_ssl_safer_memcmp( ssl->in_iv + ssl->in_msglen, mac_expect,
+ ssl->transform_in->maclen ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
+
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+ }
+ auth_done++;
+ }
+#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
+
+ /*
+ * Check length sanity
+ */
+ if( ssl->in_msglen % ssl->transform_in->ivlen != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
+ ssl->in_msglen, ssl->transform_in->ivlen ) );
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ /*
+ * Initialize for prepended IV for block cipher in TLS v1.1 and up
+ */
+ if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
+ {
+ unsigned char i;
+ dec_msglen -= ssl->transform_in->ivlen;
+ ssl->in_msglen -= ssl->transform_in->ivlen;
+
+ for( i = 0; i < ssl->transform_in->ivlen; i++ )
+ ssl->transform_in->iv_dec[i] = ssl->in_iv[i];
+ }
+#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
+ ssl->transform_in->iv_dec,
+ ssl->transform_in->ivlen,
+ dec_msg, dec_msglen,
+ dec_msg_result, &olen ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
+ return( ret );
+ }
+
+ if( dec_msglen != olen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
+ if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
+ {
+ /*
+ * Save IV in SSL3 and TLS1
+ */
+ memcpy( ssl->transform_in->iv_dec,
+ ssl->transform_in->cipher_ctx_dec.iv,
+ ssl->transform_in->ivlen );
+ }
+#endif
+
+ padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
+
+ if( ssl->in_msglen < ssl->transform_in->maclen + padlen &&
+ auth_done == 0 )
+ {
+#if defined(MBEDTLS_SSL_DEBUG_ALL)
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)",
+ ssl->in_msglen, ssl->transform_in->maclen, padlen ) );
+#endif
+ padlen = 0;
+ correct = 0;
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ if( padlen > ssl->transform_in->ivlen )
+ {
+#if defined(MBEDTLS_SSL_DEBUG_ALL)
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
+ "should be no more than %d",
+ padlen, ssl->transform_in->ivlen ) );
+#endif
+ correct = 0;
+ }
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ /*
+ * TLSv1+: always check the padding up to the first failure
+ * and fake check up to 256 bytes of padding
+ */
+ size_t pad_count = 0, real_count = 1;
+ size_t padding_idx = ssl->in_msglen - padlen;
+ size_t i;
+
+ /*
+ * Padding is guaranteed to be incorrect if:
+ * 1. padlen > ssl->in_msglen
+ *
+ * 2. padding_idx > MBEDTLS_SSL_IN_CONTENT_LEN +
+ * ssl->transform_in->maclen
+ *
+ * In both cases we reset padding_idx to a safe value (0) to
+ * prevent out-of-buffer reads.
+ */
+ correct &= ( padlen <= ssl->in_msglen );
+ correct &= ( padding_idx <= MBEDTLS_SSL_IN_CONTENT_LEN +
+ ssl->transform_in->maclen );
+
+ padding_idx *= correct;
+
+ for( i = 0; i < 256; i++ )
+ {
+ real_count &= ( i < padlen );
+ pad_count += real_count *
+ ( ssl->in_msg[padding_idx + i] == padlen - 1 );
+ }
+
+ correct &= ( pad_count == padlen ); /* Only 1 on correct padding */
+
+#if defined(MBEDTLS_SSL_DEBUG_ALL)
+ if( padlen > 0 && correct == 0 )
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) );
+#endif
+ padlen &= correct * 0x1FF;
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
+ MBEDTLS_SSL_PROTO_TLS1_2 */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ ssl->in_msglen -= padlen;
+ }
+ else
+#endif /* MBEDTLS_CIPHER_MODE_CBC &&
+ ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C || MBEDTLS_ARIA_C ) */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(MBEDTLS_SSL_DEBUG_ALL)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption",
+ ssl->in_msg, ssl->in_msglen );
+#endif
+
+ /*
+ * Authenticate if not done yet.
+ * Compute the MAC regardless of the padding result (RFC4346, CBCTIME).
+ */
+#if defined(SSL_SOME_MODES_USE_MAC)
+ if( auth_done == 0 )
+ {
+ unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD];
+
+ ssl->in_msglen -= ssl->transform_in->maclen;
+
+ ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 );
+ ssl->in_len[1] = (unsigned char)( ssl->in_msglen );
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ ssl_mac( &ssl->transform_in->md_ctx_dec,
+ ssl->transform_in->mac_dec,
+ ssl->in_msg, ssl->in_msglen,
+ ssl->in_ctr, ssl->in_msgtype,
+ mac_expect );
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ /*
+ * Process MAC and always update for padlen afterwards to make
+ * total time independent of padlen.
+ *
+ * Known timing attacks:
+ * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf)
+ *
+ * To compensate for different timings for the MAC calculation
+ * depending on how much padding was removed (which is determined
+ * by padlen), process extra_run more blocks through the hash
+ * function.
+ *
+ * The formula in the paper is
+ * extra_run = ceil( (L1-55) / 64 ) - ceil( (L2-55) / 64 )
+ * where L1 is the size of the header plus the decrypted message
+ * plus CBC padding and L2 is the size of the header plus the
+ * decrypted message. This is for an underlying hash function
+ * with 64-byte blocks.
+ * We use ( (Lx+8) / 64 ) to handle 'negative Lx' values
+ * correctly. We round down instead of up, so -56 is the correct
+ * value for our calculations instead of -55.
+ *
+ * Repeat the formula rather than defining a block_size variable.
+ * This avoids requiring division by a variable at runtime
+ * (which would be marginally less efficient and would require
+ * linking an extra division function in some builds).
+ */
+ size_t j, extra_run = 0;
+
+ /*
+ * The next two sizes are the minimum and maximum values of
+ * in_msglen over all padlen values.
+ *
+ * They're independent of padlen, since we previously did
+ * in_msglen -= padlen.
+ *
+ * Note that max_len + maclen is never more than the buffer
+ * length, as we previously did in_msglen -= maclen too.
+ */
+ const size_t max_len = ssl->in_msglen + padlen;
+ const size_t min_len = ( max_len > 256 ) ? max_len - 256 : 0;
+
+ switch( ssl->transform_in->ciphersuite_info->mac )
+ {
+#if defined(MBEDTLS_MD5_C) || defined(MBEDTLS_SHA1_C) || \
+ defined(MBEDTLS_SHA256_C)
+ case MBEDTLS_MD_MD5:
+ case MBEDTLS_MD_SHA1:
+ case MBEDTLS_MD_SHA256:
+ /* 8 bytes of message size, 64-byte compression blocks */
+ extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 -
+ ( 13 + ssl->in_msglen + 8 ) / 64;
+ break;
+#endif
+#if defined(MBEDTLS_SHA512_C)
+ case MBEDTLS_MD_SHA384:
+ /* 16 bytes of message size, 128-byte compression blocks */
+ extra_run = ( 13 + ssl->in_msglen + padlen + 16 ) / 128 -
+ ( 13 + ssl->in_msglen + 16 ) / 128;
+ break;
+#endif
+ default:
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ extra_run &= correct * 0xFF;
+
+ mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 8 );
+ mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_hdr, 3 );
+ mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_len, 2 );
+ mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg,
+ ssl->in_msglen );
+ /* Make sure we access everything even when padlen > 0. This
+ * makes the synchronisation requirements for just-in-time
+ * Prime+Probe attacks much tighter and hopefully impractical. */
+ ssl_read_memory( ssl->in_msg + ssl->in_msglen, padlen );
+ mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect );
+
+ /* Call mbedtls_md_process at least once due to cache attacks
+ * that observe whether md_process() was called of not */
+ for( j = 0; j < extra_run + 1; j++ )
+ mbedtls_md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg );
+
+ mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
+
+ /* Make sure we access all the memory that could contain the MAC,
+ * before we check it in the next code block. This makes the
+ * synchronisation requirements for just-in-time Prime+Probe
+ * attacks much tighter and hopefully impractical. */
+ ssl_read_memory( ssl->in_msg + min_len,
+ max_len - min_len + ssl->transform_in->maclen );
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
+ MBEDTLS_SSL_PROTO_TLS1_2 */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(MBEDTLS_SSL_DEBUG_ALL)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, ssl->transform_in->maclen );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_msg + ssl->in_msglen,
+ ssl->transform_in->maclen );
+#endif
+
+ if( mbedtls_ssl_safer_memcmp( ssl->in_msg + ssl->in_msglen, mac_expect,
+ ssl->transform_in->maclen ) != 0 )
+ {
+#if defined(MBEDTLS_SSL_DEBUG_ALL)
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
+#endif
+ correct = 0;
+ }
+ auth_done++;
+ }
+
+ /*
+ * Finally check the correct flag
+ */
+ if( correct == 0 )
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+#endif /* SSL_SOME_MODES_USE_MAC */
+
+ /* Make extra sure authentication was performed, exactly once */
+ if( auth_done != 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ if( ssl->in_msglen == 0 )
+ {
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3
+ && ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
+ {
+ /* TLS v1.2 explicitly disallows zero-length messages which are not application data */
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid zero-length message type: %d", ssl->in_msgtype ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ ssl->nb_zero++;
+
+ /*
+ * Three or more empty messages may be a DoS attack
+ * (excessive CPU consumption).
+ */
+ if( ssl->nb_zero > 3 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
+ "messages, possible DoS attack" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+ }
+ }
+ else
+ ssl->nb_zero = 0;
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ; /* in_ctr read from peer, not maintained internally */
+ }
+ else
+#endif
+ {
+ unsigned char i;
+ for( i = 8; i > ssl_ep_len( ssl ); i-- )
+ if( ++ssl->in_ctr[i - 1] != 0 )
+ break;
+
+ /* The loop goes to its end iff the counter is wrapping */
+ if( i == ssl_ep_len( ssl ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
+ return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
+ }
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
+
+ return( 0 );
+}
+
+#undef MAC_NONE
+#undef MAC_PLAINTEXT
+#undef MAC_CIPHERTEXT
+
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+/*
+ * Compression/decompression functions
+ */
+static int ssl_compress_buf( mbedtls_ssl_context *ssl )
+{
+ int ret;
+ unsigned char *msg_post = ssl->out_msg;
+ ptrdiff_t bytes_written = ssl->out_msg - ssl->out_buf;
+ size_t len_pre = ssl->out_msglen;
+ unsigned char *msg_pre = ssl->compress_buf;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) );
+
+ if( len_pre == 0 )
+ return( 0 );
+
+ memcpy( msg_pre, ssl->out_msg, len_pre );
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ",
+ ssl->out_msglen ) );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload",
+ ssl->out_msg, ssl->out_msglen );
+
+ ssl->transform_out->ctx_deflate.next_in = msg_pre;
+ ssl->transform_out->ctx_deflate.avail_in = len_pre;
+ ssl->transform_out->ctx_deflate.next_out = msg_post;
+ ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_OUT_BUFFER_LEN - bytes_written;
+
+ ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH );
+ if( ret != Z_OK )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) );
+ return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
+ }
+
+ ssl->out_msglen = MBEDTLS_SSL_OUT_BUFFER_LEN -
+ ssl->transform_out->ctx_deflate.avail_out - bytes_written;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
+ ssl->out_msglen ) );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload",
+ ssl->out_msg, ssl->out_msglen );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) );
+
+ return( 0 );
+}
+
+static int ssl_decompress_buf( mbedtls_ssl_context *ssl )
+{
+ int ret;
+ unsigned char *msg_post = ssl->in_msg;
+ ptrdiff_t header_bytes = ssl->in_msg - ssl->in_buf;
+ size_t len_pre = ssl->in_msglen;
+ unsigned char *msg_pre = ssl->compress_buf;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) );
+
+ if( len_pre == 0 )
+ return( 0 );
+
+ memcpy( msg_pre, ssl->in_msg, len_pre );
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ",
+ ssl->in_msglen ) );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload",
+ ssl->in_msg, ssl->in_msglen );
+
+ ssl->transform_in->ctx_inflate.next_in = msg_pre;
+ ssl->transform_in->ctx_inflate.avail_in = len_pre;
+ ssl->transform_in->ctx_inflate.next_out = msg_post;
+ ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_IN_BUFFER_LEN -
+ header_bytes;
+
+ ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH );
+ if( ret != Z_OK )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) );
+ return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
+ }
+
+ ssl->in_msglen = MBEDTLS_SSL_IN_BUFFER_LEN -
+ ssl->transform_in->ctx_inflate.avail_out - header_bytes;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
+ ssl->in_msglen ) );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload",
+ ssl->in_msg, ssl->in_msglen );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) );
+
+ return( 0 );
+}
+#endif /* MBEDTLS_ZLIB_SUPPORT */
+
+#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
+static int ssl_write_hello_request( mbedtls_ssl_context *ssl );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+static int ssl_resend_hello_request( mbedtls_ssl_context *ssl )
+{
+ /* If renegotiation is not enforced, retransmit until we would reach max
+ * timeout if we were using the usual handshake doubling scheme */
+ if( ssl->conf->renego_max_records < 0 )
+ {
+ uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1;
+ unsigned char doublings = 1;
+
+ while( ratio != 0 )
+ {
+ ++doublings;
+ ratio >>= 1;
+ }
+
+ if( ++ssl->renego_records_seen > doublings )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) );
+ return( 0 );
+ }
+ }
+
+ return( ssl_write_hello_request( ssl ) );
+}
+#endif
+#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
+
+/*
+ * Fill the input message buffer by appending data to it.
+ * The amount of data already fetched is in ssl->in_left.
+ *
+ * If we return 0, is it guaranteed that (at least) nb_want bytes are
+ * available (from this read and/or a previous one). Otherwise, an error code
+ * is returned (possibly EOF or WANT_READ).
+ *
+ * With stream transport (TLS) on success ssl->in_left == nb_want, but
+ * with datagram transport (DTLS) on success ssl->in_left >= nb_want,
+ * since we always read a whole datagram at once.
+ *
+ * For DTLS, it is up to the caller to set ssl->next_record_offset when
+ * they're done reading a record.
+ */
+int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want )
+{
+ int ret;
+ size_t len;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) );
+
+ if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
+ "or mbedtls_ssl_set_bio()" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ if( nb_want > MBEDTLS_SSL_IN_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ uint32_t timeout;
+
+ /* Just to be sure */
+ if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use "
+ "mbedtls_ssl_set_timer_cb() for DTLS" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ /*
+ * The point is, we need to always read a full datagram at once, so we
+ * sometimes read more then requested, and handle the additional data.
+ * It could be the rest of the current record (while fetching the
+ * header) and/or some other records in the same datagram.
+ */
+
+ /*
+ * Move to the next record in the already read datagram if applicable
+ */
+ if( ssl->next_record_offset != 0 )
+ {
+ if( ssl->in_left < ssl->next_record_offset )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ ssl->in_left -= ssl->next_record_offset;
+
+ if( ssl->in_left != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d",
+ ssl->next_record_offset ) );
+ memmove( ssl->in_hdr,
+ ssl->in_hdr + ssl->next_record_offset,
+ ssl->in_left );
+ }
+
+ ssl->next_record_offset = 0;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
+ ssl->in_left, nb_want ) );
+
+ /*
+ * Done if we already have enough data.
+ */
+ if( nb_want <= ssl->in_left)
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
+ return( 0 );
+ }
+
+ /*
+ * A record can't be split across datagrams. If we need to read but
+ * are not at the beginning of a new record, the caller did something
+ * wrong.
+ */
+ if( ssl->in_left != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /*
+ * Don't even try to read if time's out already.
+ * This avoids by-passing the timer when repeatedly receiving messages
+ * that will end up being dropped.
+ */
+ if( ssl_check_timer( ssl ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "timer has expired" ) );
+ ret = MBEDTLS_ERR_SSL_TIMEOUT;
+ }
+ else
+ {
+ len = MBEDTLS_SSL_IN_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf );
+
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ timeout = ssl->handshake->retransmit_timeout;
+ else
+ timeout = ssl->conf->read_timeout;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) );
+
+ if( ssl->f_recv_timeout != NULL )
+ ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len,
+ timeout );
+ else
+ ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len );
+
+ MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
+
+ if( ret == 0 )
+ return( MBEDTLS_ERR_SSL_CONN_EOF );
+ }
+
+ if( ret == MBEDTLS_ERR_SSL_TIMEOUT )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) );
+ ssl_set_timer( ssl, 0 );
+
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ if( ssl_double_retransmit_timeout( ssl ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) );
+ return( MBEDTLS_ERR_SSL_TIMEOUT );
+ }
+
+ if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
+ return( ret );
+ }
+
+ return( MBEDTLS_ERR_SSL_WANT_READ );
+ }
+#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
+ else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
+ ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
+ {
+ if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
+ return( ret );
+ }
+
+ return( MBEDTLS_ERR_SSL_WANT_READ );
+ }
+#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
+ }
+
+ if( ret < 0 )
+ return( ret );
+
+ ssl->in_left = ret;
+ }
+ else
+#endif
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
+ ssl->in_left, nb_want ) );
+
+ while( ssl->in_left < nb_want )
+ {
+ len = nb_want - ssl->in_left;
+
+ if( ssl_check_timer( ssl ) != 0 )
+ ret = MBEDTLS_ERR_SSL_TIMEOUT;
+ else
+ {
+ if( ssl->f_recv_timeout != NULL )
+ {
+ ret = ssl->f_recv_timeout( ssl->p_bio,
+ ssl->in_hdr + ssl->in_left, len,
+ ssl->conf->read_timeout );
+ }
+ else
+ {
+ ret = ssl->f_recv( ssl->p_bio,
+ ssl->in_hdr + ssl->in_left, len );
+ }
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
+ ssl->in_left, nb_want ) );
+ MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
+
+ if( ret == 0 )
+ return( MBEDTLS_ERR_SSL_CONN_EOF );
+
+ if( ret < 0 )
+ return( ret );
+
+ if ( (size_t)ret > len || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1,
+ ( "f_recv returned %d bytes but only %lu were requested",
+ ret, (unsigned long)len ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ ssl->in_left += ret;
+ }
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
+
+ return( 0 );
+}
+
+/*
+ * Flush any data not yet written
+ */
+int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl )
+{
+ int ret;
+ unsigned char *buf;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
+
+ if( ssl->f_send == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
+ "or mbedtls_ssl_set_bio()" ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ /* Avoid incrementing counter if data is flushed */
+ if( ssl->out_left == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
+ return( 0 );
+ }
+
+ while( ssl->out_left > 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d",
+ mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) );
+
+ buf = ssl->out_hdr - ssl->out_left;
+ ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left );
+
+ MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret );
+
+ if( ret <= 0 )
+ return( ret );
+
+ if( (size_t)ret > ssl->out_left || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1,
+ ( "f_send returned %d bytes but only %lu bytes were sent",
+ ret, (unsigned long)ssl->out_left ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ ssl->out_left -= ret;
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ssl->out_hdr = ssl->out_buf;
+ }
+ else
+#endif
+ {
+ ssl->out_hdr = ssl->out_buf + 8;
+ }
+ ssl_update_out_pointers( ssl, ssl->transform_out );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
+
+ return( 0 );
+}
+
+/*
+ * Functions to handle the DTLS retransmission state machine
+ */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+/*
+ * Append current handshake message to current outgoing flight
+ */
+static int ssl_flight_append( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_flight_item *msg;
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_flight_append" ) );
+ MBEDTLS_SSL_DEBUG_BUF( 4, "message appended to flight",
+ ssl->out_msg, ssl->out_msglen );
+
+ /* Allocate space for current message */
+ if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed",
+ sizeof( mbedtls_ssl_flight_item ) ) );
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ }
+
+ if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) );
+ mbedtls_free( msg );
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ }
+
+ /* Copy current handshake message with headers */
+ memcpy( msg->p, ssl->out_msg, ssl->out_msglen );
+ msg->len = ssl->out_msglen;
+ msg->type = ssl->out_msgtype;
+ msg->next = NULL;
+
+ /* Append to the current flight */
+ if( ssl->handshake->flight == NULL )
+ ssl->handshake->flight = msg;
+ else
+ {
+ mbedtls_ssl_flight_item *cur = ssl->handshake->flight;
+ while( cur->next != NULL )
+ cur = cur->next;
+ cur->next = msg;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_flight_append" ) );
+ return( 0 );
+}
+
+/*
+ * Free the current flight of handshake messages
+ */
+static void ssl_flight_free( mbedtls_ssl_flight_item *flight )
+{
+ mbedtls_ssl_flight_item *cur = flight;
+ mbedtls_ssl_flight_item *next;
+
+ while( cur != NULL )
+ {
+ next = cur->next;
+
+ mbedtls_free( cur->p );
+ mbedtls_free( cur );
+
+ cur = next;
+ }
+}
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl );
+#endif
+
+/*
+ * Swap transform_out and out_ctr with the alternative ones
+ */
+static void ssl_swap_epochs( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_transform *tmp_transform;
+ unsigned char tmp_out_ctr[8];
+
+ if( ssl->transform_out == ssl->handshake->alt_transform_out )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) );
+ return;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) );
+
+ /* Swap transforms */
+ tmp_transform = ssl->transform_out;
+ ssl->transform_out = ssl->handshake->alt_transform_out;
+ ssl->handshake->alt_transform_out = tmp_transform;
+
+ /* Swap epoch + sequence_number */
+ memcpy( tmp_out_ctr, ssl->cur_out_ctr, 8 );
+ memcpy( ssl->cur_out_ctr, ssl->handshake->alt_out_ctr, 8 );
+ memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 );
+
+ /* Adjust to the newly activated transform */
+ ssl_update_out_pointers( ssl, ssl->transform_out );
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_activate != NULL )
+ {
+ if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+}
+
+/*
+ * Retransmit the current flight of messages.
+ */
+int mbedtls_ssl_resend( mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) );
+
+ ret = mbedtls_ssl_flight_transmit( ssl );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) );
+
+ return( ret );
+}
+
+/*
+ * Transmit or retransmit the current flight of messages.
+ *
+ * Need to remember the current message in case flush_output returns
+ * WANT_WRITE, causing us to exit this function and come back later.
+ * This function must be called until state is no longer SENDING.
+ */
+int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl )
+{
+ int ret;
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_flight_transmit" ) );
+
+ if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise flight transmission" ) );
+
+ ssl->handshake->cur_msg = ssl->handshake->flight;
+ ssl->handshake->cur_msg_p = ssl->handshake->flight->p + 12;
+ ssl_swap_epochs( ssl );
+
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING;
+ }
+
+ while( ssl->handshake->cur_msg != NULL )
+ {
+ size_t max_frag_len;
+ const mbedtls_ssl_flight_item * const cur = ssl->handshake->cur_msg;
+
+ int const is_finished =
+ ( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ cur->p[0] == MBEDTLS_SSL_HS_FINISHED );
+
+ uint8_t const force_flush = ssl->disable_datagram_packing == 1 ?
+ SSL_FORCE_FLUSH : SSL_DONT_FORCE_FLUSH;
+
+ /* Swap epochs before sending Finished: we can't do it after
+ * sending ChangeCipherSpec, in case write returns WANT_READ.
+ * Must be done before copying, may change out_msg pointer */
+ if( is_finished && ssl->handshake->cur_msg_p == ( cur->p + 12 ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "swap epochs to send finished message" ) );
+ ssl_swap_epochs( ssl );
+ }
+
+ ret = ssl_get_remaining_payload_in_datagram( ssl );
+ if( ret < 0 )
+ return( ret );
+ max_frag_len = (size_t) ret;
+
+ /* CCS is copied as is, while HS messages may need fragmentation */
+ if( cur->type == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
+ {
+ if( max_frag_len == 0 )
+ {
+ if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
+ return( ret );
+
+ continue;
+ }
+
+ memcpy( ssl->out_msg, cur->p, cur->len );
+ ssl->out_msglen = cur->len;
+ ssl->out_msgtype = cur->type;
+
+ /* Update position inside current message */
+ ssl->handshake->cur_msg_p += cur->len;
+ }
+ else
+ {
+ const unsigned char * const p = ssl->handshake->cur_msg_p;
+ const size_t hs_len = cur->len - 12;
+ const size_t frag_off = p - ( cur->p + 12 );
+ const size_t rem_len = hs_len - frag_off;
+ size_t cur_hs_frag_len, max_hs_frag_len;
+
+ if( ( max_frag_len < 12 ) || ( max_frag_len == 12 && hs_len != 0 ) )
+ {
+ if( is_finished )
+ ssl_swap_epochs( ssl );
+
+ if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
+ return( ret );
+
+ continue;
+ }
+ max_hs_frag_len = max_frag_len - 12;
+
+ cur_hs_frag_len = rem_len > max_hs_frag_len ?
+ max_hs_frag_len : rem_len;
+
+ if( frag_off == 0 && cur_hs_frag_len != hs_len )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "fragmenting handshake message (%u > %u)",
+ (unsigned) cur_hs_frag_len,
+ (unsigned) max_hs_frag_len ) );
+ }
+
+ /* Messages are stored with handshake headers as if not fragmented,
+ * copy beginning of headers then fill fragmentation fields.
+ * Handshake headers: type(1) len(3) seq(2) f_off(3) f_len(3) */
+ memcpy( ssl->out_msg, cur->p, 6 );
+
+ ssl->out_msg[6] = ( ( frag_off >> 16 ) & 0xff );
+ ssl->out_msg[7] = ( ( frag_off >> 8 ) & 0xff );
+ ssl->out_msg[8] = ( ( frag_off ) & 0xff );
+
+ ssl->out_msg[ 9] = ( ( cur_hs_frag_len >> 16 ) & 0xff );
+ ssl->out_msg[10] = ( ( cur_hs_frag_len >> 8 ) & 0xff );
+ ssl->out_msg[11] = ( ( cur_hs_frag_len ) & 0xff );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "handshake header", ssl->out_msg, 12 );
+
+ /* Copy the handshake message content and set records fields */
+ memcpy( ssl->out_msg + 12, p, cur_hs_frag_len );
+ ssl->out_msglen = cur_hs_frag_len + 12;
+ ssl->out_msgtype = cur->type;
+
+ /* Update position inside current message */
+ ssl->handshake->cur_msg_p += cur_hs_frag_len;
+ }
+
+ /* If done with the current message move to the next one if any */
+ if( ssl->handshake->cur_msg_p >= cur->p + cur->len )
+ {
+ if( cur->next != NULL )
+ {
+ ssl->handshake->cur_msg = cur->next;
+ ssl->handshake->cur_msg_p = cur->next->p + 12;
+ }
+ else
+ {
+ ssl->handshake->cur_msg = NULL;
+ ssl->handshake->cur_msg_p = NULL;
+ }
+ }
+
+ /* Actually send the message out */
+ if( ( ret = mbedtls_ssl_write_record( ssl, force_flush ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
+ return( ret );
+ }
+ }
+
+ if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
+ return( ret );
+
+ /* Update state and set timer */
+ if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
+ else
+ {
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
+ ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_flight_transmit" ) );
+
+ return( 0 );
+}
+
+/*
+ * To be called when the last message of an incoming flight is received.
+ */
+void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl )
+{
+ /* We won't need to resend that one any more */
+ ssl_flight_free( ssl->handshake->flight );
+ ssl->handshake->flight = NULL;
+ ssl->handshake->cur_msg = NULL;
+
+ /* The next incoming flight will start with this msg_seq */
+ ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq;
+
+ /* We don't want to remember CCS's across flight boundaries. */
+ ssl->handshake->buffering.seen_ccs = 0;
+
+ /* Clear future message buffering structure. */
+ ssl_buffering_free( ssl );
+
+ /* Cancel timer */
+ ssl_set_timer( ssl, 0 );
+
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
+ {
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
+ }
+ else
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
+}
+
+/*
+ * To be called when the last message of an outgoing flight is send.
+ */
+void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl )
+{
+ ssl_reset_retransmit_timeout( ssl );
+ ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
+
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
+ {
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
+ }
+ else
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
+}
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+/*
+ * Handshake layer functions
+ */
+
+/*
+ * Write (DTLS: or queue) current handshake (including CCS) message.
+ *
+ * - fill in handshake headers
+ * - update handshake checksum
+ * - DTLS: save message for resending
+ * - then pass to the record layer
+ *
+ * DTLS: except for HelloRequest, messages are only queued, and will only be
+ * actually sent when calling flight_transmit() or resend().
+ *
+ * Inputs:
+ * - ssl->out_msglen: 4 + actual handshake message len
+ * (4 is the size of handshake headers for TLS)
+ * - ssl->out_msg[0]: the handshake type (ClientHello, ServerHello, etc)
+ * - ssl->out_msg + 4: the handshake message body
+ *
+ * Outputs, ie state before passing to flight_append() or write_record():
+ * - ssl->out_msglen: the length of the record contents
+ * (including handshake headers but excluding record headers)
+ * - ssl->out_msg: the record contents (handshake headers + content)
+ */
+int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl )
+{
+ int ret;
+ const size_t hs_len = ssl->out_msglen - 4;
+ const unsigned char hs_type = ssl->out_msg[0];
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write handshake message" ) );
+
+ /*
+ * Sanity checks
+ */
+ if( ssl->out_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE &&
+ ssl->out_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
+ {
+ /* In SSLv3, the client might send a NoCertificate alert. */
+#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
+ if( ! ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
+ ssl->out_msgtype == MBEDTLS_SSL_MSG_ALERT &&
+ ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) )
+#endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+
+ /* Whenever we send anything different from a
+ * HelloRequest we should be in a handshake - double check. */
+ if( ! ( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ hs_type == MBEDTLS_SSL_HS_HELLO_REQUEST ) &&
+ ssl->handshake == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->handshake != NULL &&
+ ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+#endif
+
+ /* Double-check that we did not exceed the bounds
+ * of the outgoing record buffer.
+ * This should never fail as the various message
+ * writing functions must obey the bounds of the
+ * outgoing record buffer, but better be safe.
+ *
+ * Note: We deliberately do not check for the MTU or MFL here.
+ */
+ if( ssl->out_msglen > MBEDTLS_SSL_OUT_CONTENT_LEN )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record too large: "
+ "size %u, maximum %u",
+ (unsigned) ssl->out_msglen,
+ (unsigned) MBEDTLS_SSL_OUT_CONTENT_LEN ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /*
+ * Fill handshake headers
+ */
+ if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
+ {
+ ssl->out_msg[1] = (unsigned char)( hs_len >> 16 );
+ ssl->out_msg[2] = (unsigned char)( hs_len >> 8 );
+ ssl->out_msg[3] = (unsigned char)( hs_len );
+
+ /*
+ * DTLS has additional fields in the Handshake layer,
+ * between the length field and the actual payload:
+ * uint16 message_seq;
+ * uint24 fragment_offset;
+ * uint24 fragment_length;
+ */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ /* Make room for the additional DTLS fields */
+ if( MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen < 8 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS handshake message too large: "
+ "size %u, maximum %u",
+ (unsigned) ( hs_len ),
+ (unsigned) ( MBEDTLS_SSL_OUT_CONTENT_LEN - 12 ) ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ memmove( ssl->out_msg + 12, ssl->out_msg + 4, hs_len );
+ ssl->out_msglen += 8;
+
+ /* Write message_seq and update it, except for HelloRequest */
+ if( hs_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
+ {
+ ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF;
+ ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF;
+ ++( ssl->handshake->out_msg_seq );
+ }
+ else
+ {
+ ssl->out_msg[4] = 0;
+ ssl->out_msg[5] = 0;
+ }
+
+ /* Handshake hashes are computed without fragmentation,
+ * so set frag_offset = 0 and frag_len = hs_len for now */
+ memset( ssl->out_msg + 6, 0x00, 3 );
+ memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 );
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ /* Update running hashes of handshake messages seen */
+ if( hs_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
+ ssl->handshake->update_checksum( ssl, ssl->out_msg, ssl->out_msglen );
+ }
+
+ /* Either send now, or just save to be sent (and resent) later */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ! ( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ hs_type == MBEDTLS_SSL_HS_HELLO_REQUEST ) )
+ {
+ if( ( ret = ssl_flight_append( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret );
+ return( ret );
+ }
+ }
+ else
+#endif
+ {
+ if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_record", ret );
+ return( ret );
+ }
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write handshake message" ) );
+
+ return( 0 );
+}
+
+/*
+ * Record layer functions
+ */
+
+/*
+ * Write current record.
+ *
+ * Uses:
+ * - ssl->out_msgtype: type of the message (AppData, Handshake, Alert, CCS)
+ * - ssl->out_msglen: length of the record content (excl headers)
+ * - ssl->out_msg: record content
+ */
+int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl, uint8_t force_flush )
+{
+ int ret, done = 0;
+ size_t len = ssl->out_msglen;
+ uint8_t flush = force_flush;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) );
+
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ if( ssl->transform_out != NULL &&
+ ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
+ {
+ if( ( ret = ssl_compress_buf( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret );
+ return( ret );
+ }
+
+ len = ssl->out_msglen;
+ }
+#endif /*MBEDTLS_ZLIB_SUPPORT */
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_write != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) );
+
+ ret = mbedtls_ssl_hw_record_write( ssl );
+ if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ if( ret == 0 )
+ done = 1;
+ }
+#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
+ if( !done )
+ {
+ unsigned i;
+ size_t protected_record_size;
+
+ ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
+ mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
+ ssl->conf->transport, ssl->out_hdr + 1 );
+
+ memcpy( ssl->out_ctr, ssl->cur_out_ctr, 8 );
+ ssl->out_len[0] = (unsigned char)( len >> 8 );
+ ssl->out_len[1] = (unsigned char)( len );
+
+ if( ssl->transform_out != NULL )
+ {
+ if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret );
+ return( ret );
+ }
+
+ len = ssl->out_msglen;
+ ssl->out_len[0] = (unsigned char)( len >> 8 );
+ ssl->out_len[1] = (unsigned char)( len );
+ }
+
+ protected_record_size = len + mbedtls_ssl_hdr_len( ssl );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ /* In case of DTLS, double-check that we don't exceed
+ * the remaining space in the datagram. */
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ret = ssl_get_remaining_space_in_datagram( ssl );
+ if( ret < 0 )
+ return( ret );
+
+ if( protected_record_size > (size_t) ret )
+ {
+ /* Should never happen */
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, "
+ "version = [%d:%d], msglen = %d",
+ ssl->out_hdr[0], ssl->out_hdr[1],
+ ssl->out_hdr[2], len ) );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network",
+ ssl->out_hdr, protected_record_size );
+
+ ssl->out_left += protected_record_size;
+ ssl->out_hdr += protected_record_size;
+ ssl_update_out_pointers( ssl, ssl->transform_out );
+
+ for( i = 8; i > ssl_ep_len( ssl ); i-- )
+ if( ++ssl->cur_out_ctr[i - 1] != 0 )
+ break;
+
+ /* The loop goes to its end iff the counter is wrapping */
+ if( i == ssl_ep_len( ssl ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) );
+ return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
+ }
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ flush == SSL_DONT_FORCE_FLUSH )
+ {
+ size_t remaining;
+ ret = ssl_get_remaining_payload_in_datagram( ssl );
+ if( ret < 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_remaining_payload_in_datagram",
+ ret );
+ return( ret );
+ }
+
+ remaining = (size_t) ret;
+ if( remaining == 0 )
+ {
+ flush = SSL_FORCE_FLUSH;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Still %u bytes available in current datagram", (unsigned) remaining ) );
+ }
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ if( ( flush == SSL_FORCE_FLUSH ) &&
+ ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+
+static int ssl_hs_is_proper_fragment( mbedtls_ssl_context *ssl )
+{
+ if( ssl->in_msglen < ssl->in_hslen ||
+ memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 ||
+ memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 )
+ {
+ return( 1 );
+ }
+ return( 0 );
+}
+
+static uint32_t ssl_get_hs_frag_len( mbedtls_ssl_context const *ssl )
+{
+ return( ( ssl->in_msg[9] << 16 ) |
+ ( ssl->in_msg[10] << 8 ) |
+ ssl->in_msg[11] );
+}
+
+static uint32_t ssl_get_hs_frag_off( mbedtls_ssl_context const *ssl )
+{
+ return( ( ssl->in_msg[6] << 16 ) |
+ ( ssl->in_msg[7] << 8 ) |
+ ssl->in_msg[8] );
+}
+
+static int ssl_check_hs_header( mbedtls_ssl_context const *ssl )
+{
+ uint32_t msg_len, frag_off, frag_len;
+
+ msg_len = ssl_get_hs_total_len( ssl );
+ frag_off = ssl_get_hs_frag_off( ssl );
+ frag_len = ssl_get_hs_frag_len( ssl );
+
+ if( frag_off > msg_len )
+ return( -1 );
+
+ if( frag_len > msg_len - frag_off )
+ return( -1 );
+
+ if( frag_len + 12 > ssl->in_msglen )
+ return( -1 );
+
+ return( 0 );
+}
+
+/*
+ * Mark bits in bitmask (used for DTLS HS reassembly)
+ */
+static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len )
+{
+ unsigned int start_bits, end_bits;
+
+ start_bits = 8 - ( offset % 8 );
+ if( start_bits != 8 )
+ {
+ size_t first_byte_idx = offset / 8;
+
+ /* Special case */
+ if( len <= start_bits )
+ {
+ for( ; len != 0; len-- )
+ mask[first_byte_idx] |= 1 << ( start_bits - len );
+
+ /* Avoid potential issues with offset or len becoming invalid */
+ return;
+ }
+
+ offset += start_bits; /* Now offset % 8 == 0 */
+ len -= start_bits;
+
+ for( ; start_bits != 0; start_bits-- )
+ mask[first_byte_idx] |= 1 << ( start_bits - 1 );
+ }
+
+ end_bits = len % 8;
+ if( end_bits != 0 )
+ {
+ size_t last_byte_idx = ( offset + len ) / 8;
+
+ len -= end_bits; /* Now len % 8 == 0 */
+
+ for( ; end_bits != 0; end_bits-- )
+ mask[last_byte_idx] |= 1 << ( 8 - end_bits );
+ }
+
+ memset( mask + offset / 8, 0xFF, len / 8 );
+}
+
+/*
+ * Check that bitmask is full
+ */
+static int ssl_bitmask_check( unsigned char *mask, size_t len )
+{
+ size_t i;
+
+ for( i = 0; i < len / 8; i++ )
+ if( mask[i] != 0xFF )
+ return( -1 );
+
+ for( i = 0; i < len % 8; i++ )
+ if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 )
+ return( -1 );
+
+ return( 0 );
+}
+
+/* msg_len does not include the handshake header */
+static size_t ssl_get_reassembly_buffer_size( size_t msg_len,
+ unsigned add_bitmap )
+{
+ size_t alloc_len;
+
+ alloc_len = 12; /* Handshake header */
+ alloc_len += msg_len; /* Content buffer */
+
+ if( add_bitmap )
+ alloc_len += msg_len / 8 + ( msg_len % 8 != 0 ); /* Bitmap */
+
+ return( alloc_len );
+}
+
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+static uint32_t ssl_get_hs_total_len( mbedtls_ssl_context const *ssl )
+{
+ return( ( ssl->in_msg[1] << 16 ) |
+ ( ssl->in_msg[2] << 8 ) |
+ ssl->in_msg[3] );
+}
+
+int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl )
+{
+ if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d",
+ ssl->in_msglen ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+ ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + ssl_get_hs_total_len( ssl );
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
+ " %d, type = %d, hslen = %d",
+ ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ int ret;
+ unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
+
+ if( ssl_check_hs_header( ssl ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid handshake header" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+ if( ssl->handshake != NULL &&
+ ( ( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER &&
+ recv_msg_seq != ssl->handshake->in_msg_seq ) ||
+ ( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER &&
+ ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO ) ) )
+ {
+ if( recv_msg_seq > ssl->handshake->in_msg_seq )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "received future handshake message of sequence number %u (next %u)",
+ recv_msg_seq,
+ ssl->handshake->in_msg_seq ) );
+ return( MBEDTLS_ERR_SSL_EARLY_MESSAGE );
+ }
+
+ /* Retransmit only on last message from previous flight, to avoid
+ * too many retransmissions.
+ * Besides, No sane server ever retransmits HelloVerifyRequest */
+ if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 &&
+ ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, "
+ "message_seq = %d, start_of_flight = %d",
+ recv_msg_seq,
+ ssl->handshake->in_flight_start_seq ) );
+
+ if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
+ return( ret );
+ }
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: "
+ "message_seq = %d, expected = %d",
+ recv_msg_seq,
+ ssl->handshake->in_msg_seq ) );
+ }
+
+ return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING );
+ }
+ /* Wait until message completion to increment in_msg_seq */
+
+ /* Message reassembly is handled alongside buffering of future
+ * messages; the commonality is that both handshake fragments and
+ * future messages cannot be forwarded immediately to the
+ * handshake logic layer. */
+ if( ssl_hs_is_proper_fragment( ssl ) == 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) );
+ return( MBEDTLS_ERR_SSL_EARLY_MESSAGE );
+ }
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+ /* With TLS we don't handle fragmentation (for now) */
+ if( ssl->in_msglen < ssl->in_hslen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) );
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+ }
+
+ return( 0 );
+}
+
+void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER && hs != NULL )
+ {
+ ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen );
+ }
+
+ /* Handshake message is complete, increment counter */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->handshake != NULL )
+ {
+ unsigned offset;
+ mbedtls_ssl_hs_buffer *hs_buf;
+
+ /* Increment handshake sequence number */
+ hs->in_msg_seq++;
+
+ /*
+ * Clear up handshake buffering and reassembly structure.
+ */
+
+ /* Free first entry */
+ ssl_buffering_free_slot( ssl, 0 );
+
+ /* Shift all other entries */
+ for( offset = 0, hs_buf = &hs->buffering.hs[0];
+ offset + 1 < MBEDTLS_SSL_MAX_BUFFERED_HS;
+ offset++, hs_buf++ )
+ {
+ *hs_buf = *(hs_buf + 1);
+ }
+
+ /* Create a fresh last entry */
+ memset( hs_buf, 0, sizeof( mbedtls_ssl_hs_buffer ) );
+ }
+#endif
+}
+
+/*
+ * DTLS anti-replay: RFC 6347 4.1.2.6
+ *
+ * in_window is a field of bits numbered from 0 (lsb) to 63 (msb).
+ * Bit n is set iff record number in_window_top - n has been seen.
+ *
+ * Usually, in_window_top is the last record number seen and the lsb of
+ * in_window is set. The only exception is the initial state (record number 0
+ * not seen yet).
+ */
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl )
+{
+ ssl->in_window_top = 0;
+ ssl->in_window = 0;
+}
+
+static inline uint64_t ssl_load_six_bytes( unsigned char *buf )
+{
+ return( ( (uint64_t) buf[0] << 40 ) |
+ ( (uint64_t) buf[1] << 32 ) |
+ ( (uint64_t) buf[2] << 24 ) |
+ ( (uint64_t) buf[3] << 16 ) |
+ ( (uint64_t) buf[4] << 8 ) |
+ ( (uint64_t) buf[5] ) );
+}
+
+/*
+ * Return 0 if sequence number is acceptable, -1 otherwise
+ */
+int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context *ssl )
+{
+ uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
+ uint64_t bit;
+
+ if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
+ return( 0 );
+
+ if( rec_seqnum > ssl->in_window_top )
+ return( 0 );
+
+ bit = ssl->in_window_top - rec_seqnum;
+
+ if( bit >= 64 )
+ return( -1 );
+
+ if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 )
+ return( -1 );
+
+ return( 0 );
+}
+
+/*
+ * Update replay window on new validated record
+ */
+void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl )
+{
+ uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
+
+ if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
+ return;
+
+ if( rec_seqnum > ssl->in_window_top )
+ {
+ /* Update window_top and the contents of the window */
+ uint64_t shift = rec_seqnum - ssl->in_window_top;
+
+ if( shift >= 64 )
+ ssl->in_window = 1;
+ else
+ {
+ ssl->in_window <<= shift;
+ ssl->in_window |= 1;
+ }
+
+ ssl->in_window_top = rec_seqnum;
+ }
+ else
+ {
+ /* Mark that number as seen in the current window */
+ uint64_t bit = ssl->in_window_top - rec_seqnum;
+
+ if( bit < 64 ) /* Always true, but be extra sure */
+ ssl->in_window |= (uint64_t) 1 << bit;
+ }
+}
+#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
+
+#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
+/* Forward declaration */
+static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial );
+
+/*
+ * Without any SSL context, check if a datagram looks like a ClientHello with
+ * a valid cookie, and if it doesn't, generate a HelloVerifyRequest message.
+ * Both input and output include full DTLS headers.
+ *
+ * - if cookie is valid, return 0
+ * - if ClientHello looks superficially valid but cookie is not,
+ * fill obuf and set olen, then
+ * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
+ * - otherwise return a specific error code
+ */
+static int ssl_check_dtls_clihlo_cookie(
+ mbedtls_ssl_cookie_write_t *f_cookie_write,
+ mbedtls_ssl_cookie_check_t *f_cookie_check,
+ void *p_cookie,
+ const unsigned char *cli_id, size_t cli_id_len,
+ const unsigned char *in, size_t in_len,
+ unsigned char *obuf, size_t buf_len, size_t *olen )
+{
+ size_t sid_len, cookie_len;
+ unsigned char *p;
+
+ if( f_cookie_write == NULL || f_cookie_check == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ /*
+ * Structure of ClientHello with record and handshake headers,
+ * and expected values. We don't need to check a lot, more checks will be
+ * done when actually parsing the ClientHello - skipping those checks
+ * avoids code duplication and does not make cookie forging any easier.
+ *
+ * 0-0 ContentType type; copied, must be handshake
+ * 1-2 ProtocolVersion version; copied
+ * 3-4 uint16 epoch; copied, must be 0
+ * 5-10 uint48 sequence_number; copied
+ * 11-12 uint16 length; (ignored)
+ *
+ * 13-13 HandshakeType msg_type; (ignored)
+ * 14-16 uint24 length; (ignored)
+ * 17-18 uint16 message_seq; copied
+ * 19-21 uint24 fragment_offset; copied, must be 0
+ * 22-24 uint24 fragment_length; (ignored)
+ *
+ * 25-26 ProtocolVersion client_version; (ignored)
+ * 27-58 Random random; (ignored)
+ * 59-xx SessionID session_id; 1 byte len + sid_len content
+ * 60+ opaque cookie<0..2^8-1>; 1 byte len + content
+ * ...
+ *
+ * Minimum length is 61 bytes.
+ */
+ if( in_len < 61 ||
+ in[0] != MBEDTLS_SSL_MSG_HANDSHAKE ||
+ in[3] != 0 || in[4] != 0 ||
+ in[19] != 0 || in[20] != 0 || in[21] != 0 )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ sid_len = in[59];
+ if( sid_len > in_len - 61 )
+ return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
+
+ cookie_len = in[60 + sid_len];
+ if( cookie_len > in_len - 60 )
+ return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
+
+ if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len,
+ cli_id, cli_id_len ) == 0 )
+ {
+ /* Valid cookie */
+ return( 0 );
+ }
+
+ /*
+ * If we get here, we've got an invalid cookie, let's prepare HVR.
+ *
+ * 0-0 ContentType type; copied
+ * 1-2 ProtocolVersion version; copied
+ * 3-4 uint16 epoch; copied
+ * 5-10 uint48 sequence_number; copied
+ * 11-12 uint16 length; olen - 13
+ *
+ * 13-13 HandshakeType msg_type; hello_verify_request
+ * 14-16 uint24 length; olen - 25
+ * 17-18 uint16 message_seq; copied
+ * 19-21 uint24 fragment_offset; copied
+ * 22-24 uint24 fragment_length; olen - 25
+ *
+ * 25-26 ProtocolVersion server_version; 0xfe 0xff
+ * 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie
+ *
+ * Minimum length is 28.
+ */
+ if( buf_len < 28 )
+ return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
+
+ /* Copy most fields and adapt others */
+ memcpy( obuf, in, 25 );
+ obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
+ obuf[25] = 0xfe;
+ obuf[26] = 0xff;
+
+ /* Generate and write actual cookie */
+ p = obuf + 28;
+ if( f_cookie_write( p_cookie,
+ &p, obuf + buf_len, cli_id, cli_id_len ) != 0 )
+ {
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ *olen = p - obuf;
+
+ /* Go back and fill length fields */
+ obuf[27] = (unsigned char)( *olen - 28 );
+
+ obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 );
+ obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 );
+ obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) );
+
+ obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 );
+ obuf[12] = (unsigned char)( ( *olen - 13 ) );
+
+ return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
+}
+
+/*
+ * Handle possible client reconnect with the same UDP quadruplet
+ * (RFC 6347 Section 4.2.8).
+ *
+ * Called by ssl_parse_record_header() in case we receive an epoch 0 record
+ * that looks like a ClientHello.
+ *
+ * - if the input looks like a ClientHello without cookies,
+ * send back HelloVerifyRequest, then
+ * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
+ * - if the input looks like a ClientHello with a valid cookie,
+ * reset the session of the current context, and
+ * return MBEDTLS_ERR_SSL_CLIENT_RECONNECT
+ * - if anything goes wrong, return a specific error code
+ *
+ * mbedtls_ssl_read_record() will ignore the record if anything else than
+ * MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function
+ * cannot not return 0.
+ */
+static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl )
+{
+ int ret;
+ size_t len;
+
+ ret = ssl_check_dtls_clihlo_cookie(
+ ssl->conf->f_cookie_write,
+ ssl->conf->f_cookie_check,
+ ssl->conf->p_cookie,
+ ssl->cli_id, ssl->cli_id_len,
+ ssl->in_buf, ssl->in_left,
+ ssl->out_buf, MBEDTLS_SSL_OUT_CONTENT_LEN, &len );
+
+ MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret );
+
+ if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
+ {
+ /* Don't check write errors as we can't do anything here.
+ * If the error is permanent we'll catch it later,
+ * if it's not, then hopefully it'll work next time. */
+ (void) ssl->f_send( ssl->p_bio, ssl->out_buf, len );
+
+ return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
+ }
+
+ if( ret == 0 )
+ {
+ /* Got a valid cookie, partially reset context */
+ if( ( ret = ssl_session_reset_int( ssl, 1 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret );
+ return( ret );
+ }
+
+ return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT );
+ }
+
+ return( ret );
+}
+#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
+
+/*
+ * ContentType type;
+ * ProtocolVersion version;
+ * uint16 epoch; // DTLS only
+ * uint48 sequence_number; // DTLS only
+ * uint16 length;
+ *
+ * Return 0 if header looks sane (and, for DTLS, the record is expected)
+ * MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad,
+ * MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected.
+ *
+ * With DTLS, mbedtls_ssl_read_record() will:
+ * 1. proceed with the record if this function returns 0
+ * 2. drop only the current record if this function returns UNEXPECTED_RECORD
+ * 3. return CLIENT_RECONNECT if this function return that value
+ * 4. drop the whole datagram if this function returns anything else.
+ * Point 2 is needed when the peer is resending, and we have already received
+ * the first record from a datagram but are still waiting for the others.
+ */
+static int ssl_parse_record_header( mbedtls_ssl_context *ssl )
+{
+ int major_ver, minor_ver;
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) );
+
+ ssl->in_msgtype = ssl->in_hdr[0];
+ ssl->in_msglen = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
+ mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, ssl->in_hdr + 1 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, "
+ "version = [%d:%d], msglen = %d",
+ ssl->in_msgtype,
+ major_ver, minor_ver, ssl->in_msglen ) );
+
+ /* Check record type */
+ if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE &&
+ ssl->in_msgtype != MBEDTLS_SSL_MSG_ALERT &&
+ ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
+ ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ /* Silently ignore invalid DTLS records as recommended by RFC 6347
+ * Section 4.1.2.7 */
+ if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
+
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+ /* Check version */
+ if( major_ver != ssl->major_ver )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+ if( minor_ver > ssl->conf->max_minor_ver )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+ /* Check length against the size of our buffer */
+ if( ssl->in_msglen > MBEDTLS_SSL_IN_BUFFER_LEN
+ - (size_t)( ssl->in_msg - ssl->in_buf ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+ /*
+ * DTLS-related tests.
+ * Check epoch before checking length constraint because
+ * the latter varies with the epoch. E.g., if a ChangeCipherSpec
+ * message gets duplicated before the corresponding Finished message,
+ * the second ChangeCipherSpec should be discarded because it belongs
+ * to an old epoch, but not because its length is shorter than
+ * the minimum record length for packets using the new record transform.
+ * Note that these two kinds of failures are handled differently,
+ * as an unexpected record is silently skipped but an invalid
+ * record leads to the entire datagram being dropped.
+ */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1];
+
+ /* Check epoch (and sequence number) with DTLS */
+ if( rec_epoch != ssl->in_epoch )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: "
+ "expected %d, received %d",
+ ssl->in_epoch, rec_epoch ) );
+
+#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
+ /*
+ * Check for an epoch 0 ClientHello. We can't use in_msg here to
+ * access the first byte of record content (handshake type), as we
+ * have an active transform (possibly iv_len != 0), so use the
+ * fact that the record header len is 13 instead.
+ */
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
+ ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER &&
+ rec_epoch == 0 &&
+ ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ ssl->in_left > 13 &&
+ ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect "
+ "from the same port" ) );
+ return( ssl_handle_possible_reconnect( ssl ) );
+ }
+ else
+#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
+ {
+ /* Consider buffering the record. */
+ if( rec_epoch == (unsigned int) ssl->in_epoch + 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Consider record for buffering" ) );
+ return( MBEDTLS_ERR_SSL_EARLY_MESSAGE );
+ }
+
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
+ }
+ }
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ /* Replay detection only works for the current epoch */
+ if( rec_epoch == ssl->in_epoch &&
+ mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
+ }
+#endif
+
+ /* Drop unexpected ApplicationData records,
+ * except at the beginning of renegotiations */
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA &&
+ ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ && ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
+ ssl->state == MBEDTLS_SSL_SERVER_HELLO )
+#endif
+ )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
+ }
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+
+ /* Check length against bounds of the current transform and version */
+ if( ssl->transform_in == NULL )
+ {
+ if( ssl->in_msglen < 1 ||
+ ssl->in_msglen > MBEDTLS_SSL_IN_CONTENT_LEN )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+ }
+ else
+ {
+ if( ssl->in_msglen < ssl->transform_in->minlen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
+ ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_IN_CONTENT_LEN )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ /*
+ * TLS encrypted messages can have up to 256 bytes of padding
+ */
+ if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 &&
+ ssl->in_msglen > ssl->transform_in->minlen +
+ MBEDTLS_SSL_IN_CONTENT_LEN + 256 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+#endif
+ }
+
+ return( 0 );
+}
+
+/*
+ * If applicable, decrypt (and decompress) record content
+ */
+static int ssl_prepare_record_content( mbedtls_ssl_context *ssl )
+{
+ int ret, done = 0;
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network",
+ ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen );
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_read != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) );
+
+ ret = mbedtls_ssl_hw_record_read( ssl );
+ if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ if( ret == 0 )
+ done = 1;
+ }
+#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
+ if( !done && ssl->transform_in != NULL )
+ {
+ if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt",
+ ssl->in_msg, ssl->in_msglen );
+
+ if( ssl->in_msglen > MBEDTLS_SSL_IN_CONTENT_LEN )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+ }
+
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ if( ssl->transform_in != NULL &&
+ ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
+ {
+ if( ( ret = ssl_decompress_buf( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret );
+ return( ret );
+ }
+ }
+#endif /* MBEDTLS_ZLIB_SUPPORT */
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ mbedtls_ssl_dtls_replay_update( ssl );
+ }
+#endif
+
+ return( 0 );
+}
+
+static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl );
+
+/*
+ * Read a record.
+ *
+ * Silently ignore non-fatal alert (and for DTLS, invalid records as well,
+ * RFC 6347 4.1.2.7) and continue reading until a valid record is found.
+ *
+ */
+
+/* Helper functions for mbedtls_ssl_read_record(). */
+static int ssl_consume_current_message( mbedtls_ssl_context *ssl );
+static int ssl_get_next_record( mbedtls_ssl_context *ssl );
+static int ssl_record_is_in_progress( mbedtls_ssl_context *ssl );
+
+int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl,
+ unsigned update_hs_digest )
+{
+ int ret;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) );
+
+ if( ssl->keep_current_message == 0 )
+ {
+ do {
+
+ ret = ssl_consume_current_message( ssl );
+ if( ret != 0 )
+ return( ret );
+
+ if( ssl_record_is_in_progress( ssl ) == 0 )
+ {
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ int have_buffered = 0;
+
+ /* We only check for buffered messages if the
+ * current datagram is fully consumed. */
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl_next_record_is_in_datagram( ssl ) == 0 )
+ {
+ if( ssl_load_buffered_message( ssl ) == 0 )
+ have_buffered = 1;
+ }
+
+ if( have_buffered == 0 )
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+ {
+ ret = ssl_get_next_record( ssl );
+ if( ret == MBEDTLS_ERR_SSL_CONTINUE_PROCESSING )
+ continue;
+
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_get_next_record" ), ret );
+ return( ret );
+ }
+ }
+ }
+
+ ret = mbedtls_ssl_handle_message_type( ssl );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ret == MBEDTLS_ERR_SSL_EARLY_MESSAGE )
+ {
+ /* Buffer future message */
+ ret = ssl_buffer_message( ssl );
+ if( ret != 0 )
+ return( ret );
+
+ ret = MBEDTLS_ERR_SSL_CONTINUE_PROCESSING;
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ } while( MBEDTLS_ERR_SSL_NON_FATAL == ret ||
+ MBEDTLS_ERR_SSL_CONTINUE_PROCESSING == ret );
+
+ if( 0 != ret )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_handle_message_type" ), ret );
+ return( ret );
+ }
+
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ update_hs_digest == 1 )
+ {
+ mbedtls_ssl_update_handshake_status( ssl );
+ }
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "reuse previously read message" ) );
+ ssl->keep_current_message = 0;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+static int ssl_next_record_is_in_datagram( mbedtls_ssl_context *ssl )
+{
+ if( ssl->in_left > ssl->next_record_offset )
+ return( 1 );
+
+ return( 0 );
+}
+
+static int ssl_load_buffered_message( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+ mbedtls_ssl_hs_buffer * hs_buf;
+ int ret = 0;
+
+ if( hs == NULL )
+ return( -1 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_load_buffered_messsage" ) );
+
+ if( ssl->state == MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC ||
+ ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC )
+ {
+ /* Check if we have seen a ChangeCipherSpec before.
+ * If yes, synthesize a CCS record. */
+ if( !hs->buffering.seen_ccs )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "CCS not seen in the current flight" ) );
+ ret = -1;
+ goto exit;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Injecting buffered CCS message" ) );
+ ssl->in_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC;
+ ssl->in_msglen = 1;
+ ssl->in_msg[0] = 1;
+
+ /* As long as they are equal, the exact value doesn't matter. */
+ ssl->in_left = 0;
+ ssl->next_record_offset = 0;
+
+ hs->buffering.seen_ccs = 0;
+ goto exit;
+ }
+
+#if defined(MBEDTLS_DEBUG_C)
+ /* Debug only */
+ {
+ unsigned offset;
+ for( offset = 1; offset < MBEDTLS_SSL_MAX_BUFFERED_HS; offset++ )
+ {
+ hs_buf = &hs->buffering.hs[offset];
+ if( hs_buf->is_valid == 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Future message with sequence number %u %s buffered.",
+ hs->in_msg_seq + offset,
+ hs_buf->is_complete ? "fully" : "partially" ) );
+ }
+ }
+ }
+#endif /* MBEDTLS_DEBUG_C */
+
+ /* Check if we have buffered and/or fully reassembled the
+ * next handshake message. */
+ hs_buf = &hs->buffering.hs[0];
+ if( ( hs_buf->is_valid == 1 ) && ( hs_buf->is_complete == 1 ) )
+ {
+ /* Synthesize a record containing the buffered HS message. */
+ size_t msg_len = ( hs_buf->data[1] << 16 ) |
+ ( hs_buf->data[2] << 8 ) |
+ hs_buf->data[3];
+
+ /* Double-check that we haven't accidentally buffered
+ * a message that doesn't fit into the input buffer. */
+ if( msg_len + 12 > MBEDTLS_SSL_IN_CONTENT_LEN )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Next handshake message has been buffered - load" ) );
+ MBEDTLS_SSL_DEBUG_BUF( 3, "Buffered handshake message (incl. header)",
+ hs_buf->data, msg_len + 12 );
+
+ ssl->in_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
+ ssl->in_hslen = msg_len + 12;
+ ssl->in_msglen = msg_len + 12;
+ memcpy( ssl->in_msg, hs_buf->data, ssl->in_hslen );
+
+ ret = 0;
+ goto exit;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Next handshake message %u not or only partially bufffered",
+ hs->in_msg_seq ) );
+ }
+
+ ret = -1;
+
+exit:
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_load_buffered_message" ) );
+ return( ret );
+}
+
+static int ssl_buffer_make_space( mbedtls_ssl_context *ssl,
+ size_t desired )
+{
+ int offset;
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Attempt to free buffered messages to have %u bytes available",
+ (unsigned) desired ) );
+
+ /* Get rid of future records epoch first, if such exist. */
+ ssl_free_buffered_record( ssl );
+
+ /* Check if we have enough space available now. */
+ if( desired <= ( MBEDTLS_SSL_DTLS_MAX_BUFFERING -
+ hs->buffering.total_bytes_buffered ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Enough space available after freeing future epoch record" ) );
+ return( 0 );
+ }
+
+ /* We don't have enough space to buffer the next expected handshake
+ * message. Remove buffers used for future messages to gain space,
+ * starting with the most distant one. */
+ for( offset = MBEDTLS_SSL_MAX_BUFFERED_HS - 1;
+ offset >= 0; offset-- )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Free buffering slot %d to make space for reassembly of next handshake message",
+ offset ) );
+
+ ssl_buffering_free_slot( ssl, (uint8_t) offset );
+
+ /* Check if we have enough space available now. */
+ if( desired <= ( MBEDTLS_SSL_DTLS_MAX_BUFFERING -
+ hs->buffering.total_bytes_buffered ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Enough space available after freeing buffered HS messages" ) );
+ return( 0 );
+ }
+ }
+
+ return( -1 );
+}
+
+static int ssl_buffer_message( mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+
+ if( hs == NULL )
+ return( 0 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_buffer_message" ) );
+
+ switch( ssl->in_msgtype )
+ {
+ case MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC:
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Remember CCS message" ) );
+
+ hs->buffering.seen_ccs = 1;
+ break;
+
+ case MBEDTLS_SSL_MSG_HANDSHAKE:
+ {
+ unsigned recv_msg_seq_offset;
+ unsigned recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
+ mbedtls_ssl_hs_buffer *hs_buf;
+ size_t msg_len = ssl->in_hslen - 12;
+
+ /* We should never receive an old handshake
+ * message - double-check nonetheless. */
+ if( recv_msg_seq < ssl->handshake->in_msg_seq )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ recv_msg_seq_offset = recv_msg_seq - ssl->handshake->in_msg_seq;
+ if( recv_msg_seq_offset >= MBEDTLS_SSL_MAX_BUFFERED_HS )
+ {
+ /* Silently ignore -- message too far in the future */
+ MBEDTLS_SSL_DEBUG_MSG( 2,
+ ( "Ignore future HS message with sequence number %u, "
+ "buffering window %u - %u",
+ recv_msg_seq, ssl->handshake->in_msg_seq,
+ ssl->handshake->in_msg_seq + MBEDTLS_SSL_MAX_BUFFERED_HS - 1 ) );
+
+ goto exit;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering HS message with sequence number %u, offset %u ",
+ recv_msg_seq, recv_msg_seq_offset ) );
+
+ hs_buf = &hs->buffering.hs[ recv_msg_seq_offset ];
+
+ /* Check if the buffering for this seq nr has already commenced. */
+ if( !hs_buf->is_valid )
+ {
+ size_t reassembly_buf_sz;
+
+ hs_buf->is_fragmented =
+ ( ssl_hs_is_proper_fragment( ssl ) == 1 );
+
+ /* We copy the message back into the input buffer
+ * after reassembly, so check that it's not too large.
+ * This is an implementation-specific limitation
+ * and not one from the standard, hence it is not
+ * checked in ssl_check_hs_header(). */
+ if( msg_len + 12 > MBEDTLS_SSL_IN_CONTENT_LEN )
+ {
+ /* Ignore message */
+ goto exit;
+ }
+
+ /* Check if we have enough space to buffer the message. */
+ if( hs->buffering.total_bytes_buffered >
+ MBEDTLS_SSL_DTLS_MAX_BUFFERING )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ reassembly_buf_sz = ssl_get_reassembly_buffer_size( msg_len,
+ hs_buf->is_fragmented );
+
+ if( reassembly_buf_sz > ( MBEDTLS_SSL_DTLS_MAX_BUFFERING -
+ hs->buffering.total_bytes_buffered ) )
+ {
+ if( recv_msg_seq_offset > 0 )
+ {
+ /* If we can't buffer a future message because
+ * of space limitations -- ignore. */
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future message of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- ignore\n",
+ (unsigned) msg_len, MBEDTLS_SSL_DTLS_MAX_BUFFERING,
+ (unsigned) hs->buffering.total_bytes_buffered ) );
+ goto exit;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future message of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- attempt to make space by freeing buffered future messages\n",
+ (unsigned) msg_len, MBEDTLS_SSL_DTLS_MAX_BUFFERING,
+ (unsigned) hs->buffering.total_bytes_buffered ) );
+ }
+
+ if( ssl_buffer_make_space( ssl, reassembly_buf_sz ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reassembly of next message of size %u (%u with bitmap) would exceed the compile-time limit %u (already %u bytes buffered) -- fail\n",
+ (unsigned) msg_len,
+ (unsigned) reassembly_buf_sz,
+ MBEDTLS_SSL_DTLS_MAX_BUFFERING,
+ (unsigned) hs->buffering.total_bytes_buffered ) );
+ ret = MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL;
+ goto exit;
+ }
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d",
+ msg_len ) );
+
+ hs_buf->data = mbedtls_calloc( 1, reassembly_buf_sz );
+ if( hs_buf->data == NULL )
+ {
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto exit;
+ }
+ hs_buf->data_len = reassembly_buf_sz;
+
+ /* Prepare final header: copy msg_type, length and message_seq,
+ * then add standardised fragment_offset and fragment_length */
+ memcpy( hs_buf->data, ssl->in_msg, 6 );
+ memset( hs_buf->data + 6, 0, 3 );
+ memcpy( hs_buf->data + 9, hs_buf->data + 1, 3 );
+
+ hs_buf->is_valid = 1;
+
+ hs->buffering.total_bytes_buffered += reassembly_buf_sz;
+ }
+ else
+ {
+ /* Make sure msg_type and length are consistent */
+ if( memcmp( hs_buf->data, ssl->in_msg, 4 ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Fragment header mismatch - ignore" ) );
+ /* Ignore */
+ goto exit;
+ }
+ }
+
+ if( !hs_buf->is_complete )
+ {
+ size_t frag_len, frag_off;
+ unsigned char * const msg = hs_buf->data + 12;
+
+ /*
+ * Check and copy current fragment
+ */
+
+ /* Validation of header fields already done in
+ * mbedtls_ssl_prepare_handshake_record(). */
+ frag_off = ssl_get_hs_frag_off( ssl );
+ frag_len = ssl_get_hs_frag_len( ssl );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d",
+ frag_off, frag_len ) );
+ memcpy( msg + frag_off, ssl->in_msg + 12, frag_len );
+
+ if( hs_buf->is_fragmented )
+ {
+ unsigned char * const bitmask = msg + msg_len;
+ ssl_bitmask_set( bitmask, frag_off, frag_len );
+ hs_buf->is_complete = ( ssl_bitmask_check( bitmask,
+ msg_len ) == 0 );
+ }
+ else
+ {
+ hs_buf->is_complete = 1;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "message %scomplete",
+ hs_buf->is_complete ? "" : "not yet " ) );
+ }
+
+ break;
+ }
+
+ default:
+ /* We don't buffer other types of messages. */
+ break;
+ }
+
+exit:
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_buffer_message" ) );
+ return( ret );
+}
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+static int ssl_consume_current_message( mbedtls_ssl_context *ssl )
+{
+ /*
+ * Consume last content-layer message and potentially
+ * update in_msglen which keeps track of the contents'
+ * consumption state.
+ *
+ * (1) Handshake messages:
+ * Remove last handshake message, move content
+ * and adapt in_msglen.
+ *
+ * (2) Alert messages:
+ * Consume whole record content, in_msglen = 0.
+ *
+ * (3) Change cipher spec:
+ * Consume whole record content, in_msglen = 0.
+ *
+ * (4) Application data:
+ * Don't do anything - the record layer provides
+ * the application data as a stream transport
+ * and consumes through mbedtls_ssl_read only.
+ *
+ */
+
+ /* Case (1): Handshake messages */
+ if( ssl->in_hslen != 0 )
+ {
+ /* Hard assertion to be sure that no application data
+ * is in flight, as corrupting ssl->in_msglen during
+ * ssl->in_offt != NULL is fatal. */
+ if( ssl->in_offt != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /*
+ * Get next Handshake message in the current record
+ */
+
+ /* Notes:
+ * (1) in_hslen is not necessarily the size of the
+ * current handshake content: If DTLS handshake
+ * fragmentation is used, that's the fragment
+ * size instead. Using the total handshake message
+ * size here is faulty and should be changed at
+ * some point.
+ * (2) While it doesn't seem to cause problems, one
+ * has to be very careful not to assume that in_hslen
+ * is always <= in_msglen in a sensible communication.
+ * Again, it's wrong for DTLS handshake fragmentation.
+ * The following check is therefore mandatory, and
+ * should not be treated as a silently corrected assertion.
+ * Additionally, ssl->in_hslen might be arbitrarily out of
+ * bounds after handling a DTLS message with an unexpected
+ * sequence number, see mbedtls_ssl_prepare_handshake_record.
+ */
+ if( ssl->in_hslen < ssl->in_msglen )
+ {
+ ssl->in_msglen -= ssl->in_hslen;
+ memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen,
+ ssl->in_msglen );
+
+ MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record",
+ ssl->in_msg, ssl->in_msglen );
+ }
+ else
+ {
+ ssl->in_msglen = 0;
+ }
+
+ ssl->in_hslen = 0;
+ }
+ /* Case (4): Application data */
+ else if( ssl->in_offt != NULL )
+ {
+ return( 0 );
+ }
+ /* Everything else (CCS & Alerts) */
+ else
+ {
+ ssl->in_msglen = 0;
+ }
+
+ return( 0 );
+}
+
+static int ssl_record_is_in_progress( mbedtls_ssl_context *ssl )
+{
+ if( ssl->in_msglen > 0 )
+ return( 1 );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+
+static void ssl_free_buffered_record( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+ if( hs == NULL )
+ return;
+
+ if( hs->buffering.future_record.data != NULL )
+ {
+ hs->buffering.total_bytes_buffered -=
+ hs->buffering.future_record.len;
+
+ mbedtls_free( hs->buffering.future_record.data );
+ hs->buffering.future_record.data = NULL;
+ }
+}
+
+static int ssl_load_buffered_record( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+ unsigned char * rec;
+ size_t rec_len;
+ unsigned rec_epoch;
+
+ if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ return( 0 );
+
+ if( hs == NULL )
+ return( 0 );
+
+ rec = hs->buffering.future_record.data;
+ rec_len = hs->buffering.future_record.len;
+ rec_epoch = hs->buffering.future_record.epoch;
+
+ if( rec == NULL )
+ return( 0 );
+
+ /* Only consider loading future records if the
+ * input buffer is empty. */
+ if( ssl_next_record_is_in_datagram( ssl ) == 1 )
+ return( 0 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> ssl_load_buffered_record" ) );
+
+ if( rec_epoch != ssl->in_epoch )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffered record not from current epoch." ) );
+ goto exit;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Found buffered record from current epoch - load" ) );
+
+ /* Double-check that the record is not too large */
+ if( rec_len > MBEDTLS_SSL_IN_BUFFER_LEN -
+ (size_t)( ssl->in_hdr - ssl->in_buf ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ memcpy( ssl->in_hdr, rec, rec_len );
+ ssl->in_left = rec_len;
+ ssl->next_record_offset = 0;
+
+ ssl_free_buffered_record( ssl );
+
+exit:
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= ssl_load_buffered_record" ) );
+ return( 0 );
+}
+
+static int ssl_buffer_future_record( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+ size_t const rec_hdr_len = 13;
+ size_t const total_buf_sz = rec_hdr_len + ssl->in_msglen;
+
+ /* Don't buffer future records outside handshakes. */
+ if( hs == NULL )
+ return( 0 );
+
+ /* Only buffer handshake records (we are only interested
+ * in Finished messages). */
+ if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
+ return( 0 );
+
+ /* Don't buffer more than one future epoch record. */
+ if( hs->buffering.future_record.data != NULL )
+ return( 0 );
+
+ /* Don't buffer record if there's not enough buffering space remaining. */
+ if( total_buf_sz > ( MBEDTLS_SSL_DTLS_MAX_BUFFERING -
+ hs->buffering.total_bytes_buffered ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffering of future epoch record of size %u would exceed the compile-time limit %u (already %u bytes buffered) -- ignore\n",
+ (unsigned) total_buf_sz, MBEDTLS_SSL_DTLS_MAX_BUFFERING,
+ (unsigned) hs->buffering.total_bytes_buffered ) );
+ return( 0 );
+ }
+
+ /* Buffer record */
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "Buffer record from epoch %u",
+ ssl->in_epoch + 1 ) );
+ MBEDTLS_SSL_DEBUG_BUF( 3, "Buffered record", ssl->in_hdr,
+ rec_hdr_len + ssl->in_msglen );
+
+ /* ssl_parse_record_header() only considers records
+ * of the next epoch as candidates for buffering. */
+ hs->buffering.future_record.epoch = ssl->in_epoch + 1;
+ hs->buffering.future_record.len = total_buf_sz;
+
+ hs->buffering.future_record.data =
+ mbedtls_calloc( 1, hs->buffering.future_record.len );
+ if( hs->buffering.future_record.data == NULL )
+ {
+ /* If we run out of RAM trying to buffer a
+ * record from the next epoch, just ignore. */
+ return( 0 );
+ }
+
+ memcpy( hs->buffering.future_record.data, ssl->in_hdr, total_buf_sz );
+
+ hs->buffering.total_bytes_buffered += total_buf_sz;
+ return( 0 );
+}
+
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+static int ssl_get_next_record( mbedtls_ssl_context *ssl )
+{
+ int ret;
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ /* We might have buffered a future record; if so,
+ * and if the epoch matches now, load it.
+ * On success, this call will set ssl->in_left to
+ * the length of the buffered record, so that
+ * the calls to ssl_fetch_input() below will
+ * essentially be no-ops. */
+ ret = ssl_load_buffered_record( ssl );
+ if( ret != 0 )
+ return( ret );
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ if( ( ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_hdr_len( ssl ) ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
+ return( ret );
+ }
+
+ if( ( ret = ssl_parse_record_header( ssl ) ) != 0 )
+ {
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ret != MBEDTLS_ERR_SSL_CLIENT_RECONNECT )
+ {
+ if( ret == MBEDTLS_ERR_SSL_EARLY_MESSAGE )
+ {
+ ret = ssl_buffer_future_record( ssl );
+ if( ret != 0 )
+ return( ret );
+
+ /* Fall through to handling of unexpected records */
+ ret = MBEDTLS_ERR_SSL_UNEXPECTED_RECORD;
+ }
+
+ if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD )
+ {
+ /* Skip unexpected record (but not whole datagram) */
+ ssl->next_record_offset = ssl->in_msglen
+ + mbedtls_ssl_hdr_len( ssl );
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record "
+ "(header)" ) );
+ }
+ else
+ {
+ /* Skip invalid record and the rest of the datagram */
+ ssl->next_record_offset = 0;
+ ssl->in_left = 0;
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record "
+ "(header)" ) );
+ }
+
+ /* Get next record */
+ return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING );
+ }
+#endif
+ return( ret );
+ }
+
+ /*
+ * Read and optionally decrypt the message contents
+ */
+ if( ( ret = mbedtls_ssl_fetch_input( ssl,
+ mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
+ return( ret );
+ }
+
+ /* Done reading this record, get ready for the next one */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ssl->next_record_offset = ssl->in_msglen + mbedtls_ssl_hdr_len( ssl );
+ if( ssl->next_record_offset < ssl->in_left )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "more than one record within datagram" ) );
+ }
+ }
+ else
+#endif
+ ssl->in_left = 0;
+
+ if( ( ret = ssl_prepare_record_content( ssl ) ) != 0 )
+ {
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ /* Silently discard invalid records */
+ if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD ||
+ ret == MBEDTLS_ERR_SSL_INVALID_MAC )
+ {
+ /* Except when waiting for Finished as a bad mac here
+ * probably means something went wrong in the handshake
+ * (eg wrong psk used, mitm downgrade attempt, etc.) */
+ if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED ||
+ ssl->state == MBEDTLS_SSL_SERVER_FINISHED )
+ {
+#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
+ if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
+ {
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
+ }
+#endif
+ return( ret );
+ }
+
+#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
+ if( ssl->conf->badmac_limit != 0 &&
+ ++ssl->badmac_seen >= ssl->conf->badmac_limit )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) );
+ return( MBEDTLS_ERR_SSL_INVALID_MAC );
+ }
+#endif
+
+ /* As above, invalid records cause
+ * dismissal of the whole datagram. */
+
+ ssl->next_record_offset = 0;
+ ssl->in_left = 0;
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) );
+ return( MBEDTLS_ERR_SSL_CONTINUE_PROCESSING );
+ }
+
+ return( ret );
+ }
+ else
+#endif
+ {
+ /* Error out (and send alert) on invalid records */
+#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
+ if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
+ {
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
+ }
+#endif
+ return( ret );
+ }
+ }
+
+ return( 0 );
+}
+
+int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl )
+{
+ int ret;
+
+ /*
+ * Handle particular types of records
+ */
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
+ {
+ if( ( ret = mbedtls_ssl_prepare_handshake_record( ssl ) ) != 0 )
+ {
+ return( ret );
+ }
+ }
+
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
+ {
+ if( ssl->in_msglen != 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid CCS message, len: %d",
+ ssl->in_msglen ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+ if( ssl->in_msg[0] != 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid CCS message, content: %02x",
+ ssl->in_msg[0] ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC &&
+ ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC )
+ {
+ if( ssl->handshake == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping ChangeCipherSpec outside handshake" ) );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "received out-of-order ChangeCipherSpec - remember" ) );
+ return( MBEDTLS_ERR_SSL_EARLY_MESSAGE );
+ }
+#endif
+ }
+
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
+ {
+ if( ssl->in_msglen != 2 )
+ {
+ /* Note: Standard allows for more than one 2 byte alert
+ to be packed in a single message, but Mbed TLS doesn't
+ currently support this. */
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid alert message, len: %d",
+ ssl->in_msglen ) );
+ return( MBEDTLS_ERR_SSL_INVALID_RECORD );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
+ ssl->in_msg[0], ssl->in_msg[1] ) );
+
+ /*
+ * Ignore non-fatal alerts, except close_notify and no_renegotiation
+ */
+ if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)",
+ ssl->in_msg[1] ) );
+ return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE );
+ }
+
+ if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
+ ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) );
+ return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY );
+ }
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED)
+ if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
+ ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no renegotiation alert" ) );
+ /* Will be handled when trying to parse ServerHello */
+ return( 0 );
+ }
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
+ ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
+ ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
+ ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
+ /* Will be handled in mbedtls_ssl_parse_certificate() */
+ return( 0 );
+ }
+#endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */
+
+ /* Silently ignore: fetch new message */
+ return MBEDTLS_ERR_SSL_NON_FATAL;
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->handshake != NULL &&
+ ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ ssl_handshake_wrapup_free_hs_transform( ssl );
+ }
+#endif
+
+ return( 0 );
+}
+
+int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl )
+{
+ int ret;
+
+ if( ( ret = mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 )
+ {
+ return( ret );
+ }
+
+ return( 0 );
+}
+
+int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl,
+ unsigned char level,
+ unsigned char message )
+{
+ int ret;
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) );
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "send alert level=%u message=%u", level, message ));
+
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
+ ssl->out_msglen = 2;
+ ssl->out_msg[0] = level;
+ ssl->out_msg[1] = message;
+
+ if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
+ return( ret );
+ }
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+static void ssl_clear_peer_cert( mbedtls_ssl_session *session )
+{
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ if( session->peer_cert != NULL )
+ {
+ mbedtls_x509_crt_free( session->peer_cert );
+ mbedtls_free( session->peer_cert );
+ session->peer_cert = NULL;
+ }
+#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ if( session->peer_cert_digest != NULL )
+ {
+ /* Zeroization is not necessary. */
+ mbedtls_free( session->peer_cert_digest );
+ session->peer_cert_digest = NULL;
+ session->peer_cert_digest_type = MBEDTLS_MD_NONE;
+ session->peer_cert_digest_len = 0;
+ }
+#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+/*
+ * Handshake functions
+ */
+#if !defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+/* No certificate support -> dummy functions */
+int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
+{
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
+
+ if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+}
+
+int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
+{
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
+
+ if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+}
+
+#else /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
+/* Some certificate support -> implement write and parse */
+
+int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
+ size_t i, n;
+ const mbedtls_x509_crt *crt;
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
+
+ if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ {
+ if( ssl->client_auth == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ /*
+ * If using SSLv3 and got no cert, send an Alert message
+ * (otherwise an empty Certificate message will be sent).
+ */
+ if( mbedtls_ssl_own_cert( ssl ) == NULL &&
+ ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ ssl->out_msglen = 2;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
+ ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING;
+ ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
+ goto write_msg;
+ }
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+ }
+#endif /* MBEDTLS_SSL_CLI_C */
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ if( mbedtls_ssl_own_cert( ssl ) == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
+ return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED );
+ }
+ }
+#endif
+
+ MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) );
+
+ /*
+ * 0 . 0 handshake type
+ * 1 . 3 handshake length
+ * 4 . 6 length of all certs
+ * 7 . 9 length of cert. 1
+ * 10 . n-1 peer certificate
+ * n . n+2 length of cert. 2
+ * n+3 . ... upper level cert, etc.
+ */
+ i = 7;
+ crt = mbedtls_ssl_own_cert( ssl );
+
+ while( crt != NULL )
+ {
+ n = crt->raw.len;
+ if( n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
+ i + 3 + n, MBEDTLS_SSL_OUT_CONTENT_LEN ) );
+ return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
+ }
+
+ ssl->out_msg[i ] = (unsigned char)( n >> 16 );
+ ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
+ ssl->out_msg[i + 2] = (unsigned char)( n );
+
+ i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
+ i += n; crt = crt->next;
+ }
+
+ ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
+ ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
+ ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
+
+ ssl->out_msglen = i;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE;
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
+write_msg:
+#endif
+
+ ssl->state++;
+
+ if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
+
+ return( ret );
+}
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
+
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl,
+ unsigned char *crt_buf,
+ size_t crt_buf_len )
+{
+ mbedtls_x509_crt const * const peer_crt = ssl->session->peer_cert;
+
+ if( peer_crt == NULL )
+ return( -1 );
+
+ if( peer_crt->raw.len != crt_buf_len )
+ return( -1 );
+
+ return( memcmp( peer_crt->raw.p, crt_buf, crt_buf_len ) );
+}
+#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl,
+ unsigned char *crt_buf,
+ size_t crt_buf_len )
+{
+ int ret;
+ unsigned char const * const peer_cert_digest =
+ ssl->session->peer_cert_digest;
+ mbedtls_md_type_t const peer_cert_digest_type =
+ ssl->session->peer_cert_digest_type;
+ mbedtls_md_info_t const * const digest_info =
+ mbedtls_md_info_from_type( peer_cert_digest_type );
+ unsigned char tmp_digest[MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN];
+ size_t digest_len;
+
+ if( peer_cert_digest == NULL || digest_info == NULL )
+ return( -1 );
+
+ digest_len = mbedtls_md_get_size( digest_info );
+ if( digest_len > MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN )
+ return( -1 );
+
+ ret = mbedtls_md( digest_info, crt_buf, crt_buf_len, tmp_digest );
+ if( ret != 0 )
+ return( -1 );
+
+ return( memcmp( tmp_digest, peer_cert_digest, digest_len ) );
+}
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
+
+/*
+ * Once the certificate message is read, parse it into a cert chain and
+ * perform basic checks, but leave actual verification to the caller
+ */
+static int ssl_parse_certificate_chain( mbedtls_ssl_context *ssl,
+ mbedtls_x509_crt *chain )
+{
+ int ret;
+#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
+ int crt_cnt=0;
+#endif
+ size_t i, n;
+ uint8_t alert;
+
+ if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE ||
+ ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ i = mbedtls_ssl_hs_hdr_len( ssl );
+
+ /*
+ * Same message structure as in mbedtls_ssl_write_certificate()
+ */
+ n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2];
+
+ if( ssl->in_msg[i] != 0 ||
+ ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ /* Make &ssl->in_msg[i] point to the beginning of the CRT chain. */
+ i += 3;
+
+ /* Iterate through and parse the CRTs in the provided chain. */
+ while( i < ssl->in_hslen )
+ {
+ /* Check that there's room for the next CRT's length fields. */
+ if ( i + 3 > ssl->in_hslen ) {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+ /* In theory, the CRT can be up to 2**24 Bytes, but we don't support
+ * anything beyond 2**16 ~ 64K. */
+ if( ssl->in_msg[i] != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ /* Read length of the next CRT in the chain. */
+ n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
+ | (unsigned int) ssl->in_msg[i + 2];
+ i += 3;
+
+ if( n < 128 || i + n > ssl->in_hslen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ /* Check if we're handling the first CRT in the chain. */
+#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
+ if( crt_cnt++ == 0 &&
+ ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
+ ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
+ {
+ /* During client-side renegotiation, check that the server's
+ * end-CRTs hasn't changed compared to the initial handshake,
+ * mitigating the triple handshake attack. On success, reuse
+ * the original end-CRT instead of parsing it again. */
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Check that peer CRT hasn't changed during renegotiation" ) );
+ if( ssl_check_peer_crt_unchanged( ssl,
+ &ssl->in_msg[i],
+ n ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED );
+ return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ /* Now we can safely free the original chain. */
+ ssl_clear_peer_cert( ssl->session );
+ }
+#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
+
+ /* Parse the next certificate in the chain. */
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ ret = mbedtls_x509_crt_parse_der( chain, ssl->in_msg + i, n );
+#else
+ /* If we don't need to store the CRT chain permanently, parse
+ * it in-place from the input buffer instead of making a copy. */
+ ret = mbedtls_x509_crt_parse_der_nocopy( chain, ssl->in_msg + i, n );
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ switch( ret )
+ {
+ case 0: /*ok*/
+ case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND:
+ /* Ignore certificate with an unknown algorithm: maybe a
+ prior certificate was already trusted. */
+ break;
+
+ case MBEDTLS_ERR_X509_ALLOC_FAILED:
+ alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR;
+ goto crt_parse_der_failed;
+
+ case MBEDTLS_ERR_X509_UNKNOWN_VERSION:
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ goto crt_parse_der_failed;
+
+ default:
+ alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
+ crt_parse_der_failed:
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert );
+ MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
+ return( ret );
+ }
+
+ i += n;
+ }
+
+ MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", chain );
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_SRV_C)
+static int ssl_srv_check_client_no_crt_notification( mbedtls_ssl_context *ssl )
+{
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ return( -1 );
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ /*
+ * Check if the client sent an empty certificate
+ */
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ if( ssl->in_msglen == 2 &&
+ ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT &&
+ ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
+ ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
+ return( 0 );
+ }
+
+ return( -1 );
+ }
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) &&
+ ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
+ ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE &&
+ memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
+ return( 0 );
+ }
+
+ return( -1 );
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
+ MBEDTLS_SSL_PROTO_TLS1_2 */
+}
+#endif /* MBEDTLS_SSL_SRV_C */
+
+/* Check if a certificate message is expected.
+ * Return either
+ * - SSL_CERTIFICATE_EXPECTED, or
+ * - SSL_CERTIFICATE_SKIP
+ * indicating whether a Certificate message is expected or not.
+ */
+#define SSL_CERTIFICATE_EXPECTED 0
+#define SSL_CERTIFICATE_SKIP 1
+static int ssl_parse_certificate_coordinate( mbedtls_ssl_context *ssl,
+ int authmode )
+{
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
+ ssl->transform_negotiate->ciphersuite_info;
+
+ if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) )
+ return( SSL_CERTIFICATE_SKIP );
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
+ return( SSL_CERTIFICATE_SKIP );
+
+ if( authmode == MBEDTLS_SSL_VERIFY_NONE )
+ {
+ ssl->session_negotiate->verify_result =
+ MBEDTLS_X509_BADCERT_SKIP_VERIFY;
+ return( SSL_CERTIFICATE_SKIP );
+ }
+ }
+#else
+ ((void) authmode);
+#endif /* MBEDTLS_SSL_SRV_C */
+
+ return( SSL_CERTIFICATE_EXPECTED );
+}
+
+static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl,
+ int authmode,
+ mbedtls_x509_crt *chain,
+ void *rs_ctx )
+{
+ int ret = 0;
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
+ ssl->transform_negotiate->ciphersuite_info;
+ int have_ca_chain = 0;
+
+ int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *);
+ void *p_vrfy;
+
+ if( authmode == MBEDTLS_SSL_VERIFY_NONE )
+ return( 0 );
+
+ if( ssl->f_vrfy != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use context-specific verification callback" ) );
+ f_vrfy = ssl->f_vrfy;
+ p_vrfy = ssl->p_vrfy;
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use configuration-specific verification callback" ) );
+ f_vrfy = ssl->conf->f_vrfy;
+ p_vrfy = ssl->conf->p_vrfy;
+ }
+
+ /*
+ * Main check: verify certificate
+ */
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+ if( ssl->conf->f_ca_cb != NULL )
+ {
+ ((void) rs_ctx);
+ have_ca_chain = 1;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "use CA callback for X.509 CRT verification" ) );
+ ret = mbedtls_x509_crt_verify_with_ca_cb(
+ chain,
+ ssl->conf->f_ca_cb,
+ ssl->conf->p_ca_cb,
+ ssl->conf->cert_profile,
+ ssl->hostname,
+ &ssl->session_negotiate->verify_result,
+ f_vrfy, p_vrfy );
+ }
+ else
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+ {
+ mbedtls_x509_crt *ca_chain;
+ mbedtls_x509_crl *ca_crl;
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+ if( ssl->handshake->sni_ca_chain != NULL )
+ {
+ ca_chain = ssl->handshake->sni_ca_chain;
+ ca_crl = ssl->handshake->sni_ca_crl;
+ }
+ else
+#endif
+ {
+ ca_chain = ssl->conf->ca_chain;
+ ca_crl = ssl->conf->ca_crl;
+ }
+
+ if( ca_chain != NULL )
+ have_ca_chain = 1;
+
+ ret = mbedtls_x509_crt_verify_restartable(
+ chain,
+ ca_chain, ca_crl,
+ ssl->conf->cert_profile,
+ ssl->hostname,
+ &ssl->session_negotiate->verify_result,
+ f_vrfy, p_vrfy, rs_ctx );
+ }
+
+ if( ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
+ }
+
+#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
+ if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
+ return( MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS );
+#endif
+
+ /*
+ * Secondary checks: always done, but change 'ret' only if it was 0
+ */
+
+#if defined(MBEDTLS_ECP_C)
+ {
+ const mbedtls_pk_context *pk = &chain->pk;
+
+ /* If certificate uses an EC key, make sure the curve is OK */
+ if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) &&
+ mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 )
+ {
+ ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY;
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
+ if( ret == 0 )
+ ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
+ }
+ }
+#endif /* MBEDTLS_ECP_C */
+
+ if( mbedtls_ssl_check_cert_usage( chain,
+ ciphersuite_info,
+ ! ssl->conf->endpoint,
+ &ssl->session_negotiate->verify_result ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
+ if( ret == 0 )
+ ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
+ }
+
+ /* mbedtls_x509_crt_verify_with_profile is supposed to report a
+ * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED,
+ * with details encoded in the verification flags. All other kinds
+ * of error codes, including those from the user provided f_vrfy
+ * functions, are treated as fatal and lead to a failure of
+ * ssl_parse_certificate even if verification was optional. */
+ if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL &&
+ ( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ||
+ ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) )
+ {
+ ret = 0;
+ }
+
+ if( have_ca_chain == 0 && authmode == MBEDTLS_SSL_VERIFY_REQUIRED )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
+ ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED;
+ }
+
+ if( ret != 0 )
+ {
+ uint8_t alert;
+
+ /* The certificate may have been rejected for several reasons.
+ Pick one and send the corresponding alert. Which alert to send
+ may be a subject of debate in some cases. */
+ if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER )
+ alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH )
+ alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED )
+ alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED )
+ alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED;
+ else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED )
+ alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA;
+ else
+ alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN;
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ alert );
+ }
+
+#if defined(MBEDTLS_DEBUG_C)
+ if( ssl->session_negotiate->verify_result != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x",
+ ssl->session_negotiate->verify_result ) );
+ }
+ else
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) );
+ }
+#endif /* MBEDTLS_DEBUG_C */
+
+ return( ret );
+}
+
+#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+static int ssl_remember_peer_crt_digest( mbedtls_ssl_context *ssl,
+ unsigned char *start, size_t len )
+{
+ int ret;
+ /* Remember digest of the peer's end-CRT. */
+ ssl->session_negotiate->peer_cert_digest =
+ mbedtls_calloc( 1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN );
+ if( ssl->session_negotiate->peer_cert_digest == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
+ sizeof( MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ) ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ }
+
+ ret = mbedtls_md( mbedtls_md_info_from_type(
+ MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE ),
+ start, len,
+ ssl->session_negotiate->peer_cert_digest );
+
+ ssl->session_negotiate->peer_cert_digest_type =
+ MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE;
+ ssl->session_negotiate->peer_cert_digest_len =
+ MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN;
+
+ return( ret );
+}
+
+static int ssl_remember_peer_pubkey( mbedtls_ssl_context *ssl,
+ unsigned char *start, size_t len )
+{
+ unsigned char *end = start + len;
+ int ret;
+
+ /* Make a copy of the peer's raw public key. */
+ mbedtls_pk_init( &ssl->handshake->peer_pubkey );
+ ret = mbedtls_pk_parse_subpubkey( &start, end,
+ &ssl->handshake->peer_pubkey );
+ if( ret != 0 )
+ {
+ /* We should have parsed the public key before. */
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ return( 0 );
+}
+#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+
+int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+ int crt_expected;
+#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+ const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET
+ ? ssl->handshake->sni_authmode
+ : ssl->conf->authmode;
+#else
+ const int authmode = ssl->conf->authmode;
+#endif
+ void *rs_ctx = NULL;
+ mbedtls_x509_crt *chain = NULL;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
+
+ crt_expected = ssl_parse_certificate_coordinate( ssl, authmode );
+ if( crt_expected == SSL_CERTIFICATE_SKIP )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
+ goto exit;
+ }
+
+#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
+ if( ssl->handshake->ecrs_enabled &&
+ ssl->handshake->ecrs_state == ssl_ecrs_crt_verify )
+ {
+ chain = ssl->handshake->ecrs_peer_cert;
+ ssl->handshake->ecrs_peer_cert = NULL;
+ goto crt_verify;
+ }
+#endif
+
+ if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
+ {
+ /* mbedtls_ssl_read_record may have sent an alert already. We
+ let it decide whether to alert. */
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
+ goto exit;
+ }
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl_srv_check_client_no_crt_notification( ssl ) == 0 )
+ {
+ ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
+
+ if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
+ ret = 0;
+ else
+ ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE;
+
+ goto exit;
+ }
+#endif /* MBEDTLS_SSL_SRV_C */
+
+ /* Clear existing peer CRT structure in case we tried to
+ * reuse a session but it failed, and allocate a new one. */
+ ssl_clear_peer_cert( ssl->session_negotiate );
+
+ chain = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
+ if( chain == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
+ sizeof( mbedtls_x509_crt ) ) );
+ mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto exit;
+ }
+ mbedtls_x509_crt_init( chain );
+
+ ret = ssl_parse_certificate_chain( ssl, chain );
+ if( ret != 0 )
+ goto exit;
+
+#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
+ if( ssl->handshake->ecrs_enabled)
+ ssl->handshake->ecrs_state = ssl_ecrs_crt_verify;
+
+crt_verify:
+ if( ssl->handshake->ecrs_enabled)
+ rs_ctx = &ssl->handshake->ecrs_ctx;
+#endif
+
+ ret = ssl_parse_certificate_verify( ssl, authmode,
+ chain, rs_ctx );
+ if( ret != 0 )
+ goto exit;
+
+#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ {
+ unsigned char *crt_start, *pk_start;
+ size_t crt_len, pk_len;
+
+ /* We parse the CRT chain without copying, so
+ * these pointers point into the input buffer,
+ * and are hence still valid after freeing the
+ * CRT chain. */
+
+ crt_start = chain->raw.p;
+ crt_len = chain->raw.len;
+
+ pk_start = chain->pk_raw.p;
+ pk_len = chain->pk_raw.len;
+
+ /* Free the CRT structures before computing
+ * digest and copying the peer's public key. */
+ mbedtls_x509_crt_free( chain );
+ mbedtls_free( chain );
+ chain = NULL;
+
+ ret = ssl_remember_peer_crt_digest( ssl, crt_start, crt_len );
+ if( ret != 0 )
+ goto exit;
+
+ ret = ssl_remember_peer_pubkey( ssl, pk_start, pk_len );
+ if( ret != 0 )
+ goto exit;
+ }
+#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+ /* Pass ownership to session structure. */
+ ssl->session_negotiate->peer_cert = chain;
+ chain = NULL;
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
+
+exit:
+
+ if( ret == 0 )
+ ssl->state++;
+
+#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
+ if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+ {
+ ssl->handshake->ecrs_peer_cert = chain;
+ chain = NULL;
+ }
+#endif
+
+ if( chain != NULL )
+ {
+ mbedtls_x509_crt_free( chain );
+ mbedtls_free( chain );
+ }
+
+ return( ret );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
+
+int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl )
+{
+ int ret;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
+
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC;
+ ssl->out_msglen = 1;
+ ssl->out_msg[0] = 1;
+
+ ssl->state++;
+
+ if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
+
+ return( 0 );
+}
+
+int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl )
+{
+ int ret;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) );
+
+ if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
+ return( ret );
+ }
+
+ if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ /* CCS records are only accepted if they have length 1 and content '1',
+ * so we don't need to check this here. */
+
+ /*
+ * Switch to our negotiated transform and session parameters for inbound
+ * data.
+ */
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) );
+ ssl->transform_in = ssl->transform_negotiate;
+ ssl->session_in = ssl->session_negotiate;
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ ssl_dtls_replay_reset( ssl );
+#endif
+
+ /* Increment epoch */
+ if( ++ssl->in_epoch == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
+ /* This is highly unlikely to happen for legitimate reasons, so
+ treat it as an attack and don't send an alert. */
+ return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
+ }
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+ memset( ssl->in_ctr, 0, 8 );
+
+ ssl_update_in_pointers( ssl, ssl->transform_negotiate );
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_activate != NULL )
+ {
+ if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+
+ ssl->state++;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) );
+
+ return( 0 );
+}
+
+void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
+ const mbedtls_ssl_ciphersuite_t *ciphersuite_info )
+{
+ ((void) ciphersuite_info);
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
+ ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
+ else
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA512_C)
+ if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
+ ssl->handshake->update_checksum = ssl_update_checksum_sha384;
+ else
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 )
+ ssl->handshake->update_checksum = ssl_update_checksum_sha256;
+ else
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return;
+ }
+}
+
+void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl )
+{
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ mbedtls_md5_starts_ret( &ssl->handshake->fin_md5 );
+ mbedtls_sha1_starts_ret( &ssl->handshake->fin_sha1 );
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_abort( &ssl->handshake->fin_sha256_psa );
+ psa_hash_setup( &ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256 );
+#else
+ mbedtls_sha256_starts_ret( &ssl->handshake->fin_sha256, 0 );
+#endif
+#endif
+#if defined(MBEDTLS_SHA512_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_abort( &ssl->handshake->fin_sha384_psa );
+ psa_hash_setup( &ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384 );
+#else
+ mbedtls_sha512_starts_ret( &ssl->handshake->fin_sha512, 1 );
+#endif
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+}
+
+static void ssl_update_checksum_start( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len );
+ mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len );
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len );
+#else
+ mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len );
+#endif
+#endif
+#if defined(MBEDTLS_SHA512_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len );
+#else
+ mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len );
+#endif
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+}
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len );
+ mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len );
+}
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len );
+#else
+ mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len );
+#endif
+}
+#endif
+
+#if defined(MBEDTLS_SHA512_C)
+static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len );
+#else
+ mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len );
+#endif
+}
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+static void ssl_calc_finished_ssl(
+ mbedtls_ssl_context *ssl, unsigned char *buf, int from )
+{
+ const char *sender;
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+
+ unsigned char padbuf[48];
+ unsigned char md5sum[16];
+ unsigned char sha1sum[20];
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) );
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
+ mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
+
+ /*
+ * SSLv3:
+ * hash =
+ * MD5( master + pad2 +
+ * MD5( handshake + sender + master + pad1 ) )
+ * + SHA1( master + pad2 +
+ * SHA1( handshake + sender + master + pad1 ) )
+ */
+
+#if !defined(MBEDTLS_MD5_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
+ md5.state, sizeof( md5.state ) );
+#endif
+
+#if !defined(MBEDTLS_SHA1_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
+ sha1.state, sizeof( sha1.state ) );
+#endif
+
+ sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT"
+ : "SRVR";
+
+ memset( padbuf, 0x36, 48 );
+
+ mbedtls_md5_update_ret( &md5, (const unsigned char *) sender, 4 );
+ mbedtls_md5_update_ret( &md5, session->master, 48 );
+ mbedtls_md5_update_ret( &md5, padbuf, 48 );
+ mbedtls_md5_finish_ret( &md5, md5sum );
+
+ mbedtls_sha1_update_ret( &sha1, (const unsigned char *) sender, 4 );
+ mbedtls_sha1_update_ret( &sha1, session->master, 48 );
+ mbedtls_sha1_update_ret( &sha1, padbuf, 40 );
+ mbedtls_sha1_finish_ret( &sha1, sha1sum );
+
+ memset( padbuf, 0x5C, 48 );
+
+ mbedtls_md5_starts_ret( &md5 );
+ mbedtls_md5_update_ret( &md5, session->master, 48 );
+ mbedtls_md5_update_ret( &md5, padbuf, 48 );
+ mbedtls_md5_update_ret( &md5, md5sum, 16 );
+ mbedtls_md5_finish_ret( &md5, buf );
+
+ mbedtls_sha1_starts_ret( &sha1 );
+ mbedtls_sha1_update_ret( &sha1, session->master, 48 );
+ mbedtls_sha1_update_ret( &sha1, padbuf , 40 );
+ mbedtls_sha1_update_ret( &sha1, sha1sum, 20 );
+ mbedtls_sha1_finish_ret( &sha1, buf + 16 );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 );
+
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) );
+ mbedtls_platform_zeroize( md5sum, sizeof( md5sum ) );
+ mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+static void ssl_calc_finished_tls(
+ mbedtls_ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ mbedtls_md5_context md5;
+ mbedtls_sha1_context sha1;
+ unsigned char padbuf[36];
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) );
+
+ mbedtls_md5_init( &md5 );
+ mbedtls_sha1_init( &sha1 );
+
+ mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
+ mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
+
+ /*
+ * TLSv1:
+ * hash = PRF( master, finished_label,
+ * MD5( handshake ) + SHA1( handshake ) )[0..11]
+ */
+
+#if !defined(MBEDTLS_MD5_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
+ md5.state, sizeof( md5.state ) );
+#endif
+
+#if !defined(MBEDTLS_SHA1_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
+ sha1.state, sizeof( sha1.state ) );
+#endif
+
+ sender = ( from == MBEDTLS_SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+ mbedtls_md5_finish_ret( &md5, padbuf );
+ mbedtls_sha1_finish_ret( &sha1, padbuf + 16 );
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 36, buf, len );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ mbedtls_md5_free( &md5 );
+ mbedtls_sha1_free( &sha1 );
+
+ mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+static void ssl_calc_finished_tls_sha256(
+ mbedtls_ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ unsigned char padbuf[32];
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ size_t hash_size;
+ psa_hash_operation_t sha256_psa = PSA_HASH_OPERATION_INIT;
+ psa_status_t status;
+#else
+ mbedtls_sha256_context sha256;
+#endif
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ sender = ( from == MBEDTLS_SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ sha256_psa = psa_hash_operation_init();
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc PSA finished tls sha256" ) );
+
+ status = psa_hash_clone( &ssl->handshake->fin_sha256_psa, &sha256_psa );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) );
+ return;
+ }
+
+ status = psa_hash_finish( &sha256_psa, padbuf, sizeof( padbuf ), &hash_size );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) );
+ return;
+ }
+ MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 32 );
+#else
+
+ mbedtls_sha256_init( &sha256 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) );
+
+ mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
+
+ /*
+ * TLSv1.2:
+ * hash = PRF( master, finished_label,
+ * Hash( handshake ) )[0.11]
+ */
+
+#if !defined(MBEDTLS_SHA256_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *)
+ sha256.state, sizeof( sha256.state ) );
+#endif
+
+ mbedtls_sha256_finish_ret( &sha256, padbuf );
+ mbedtls_sha256_free( &sha256 );
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 32, buf, len );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* MBEDTLS_SHA256_C */
+
+#if defined(MBEDTLS_SHA512_C)
+static void ssl_calc_finished_tls_sha384(
+ mbedtls_ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ unsigned char padbuf[48];
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ size_t hash_size;
+ psa_hash_operation_t sha384_psa = PSA_HASH_OPERATION_INIT;
+ psa_status_t status;
+#else
+ mbedtls_sha512_context sha512;
+#endif
+
+ mbedtls_ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ sender = ( from == MBEDTLS_SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ sha384_psa = psa_hash_operation_init();
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc PSA finished tls sha384" ) );
+
+ status = psa_hash_clone( &ssl->handshake->fin_sha384_psa, &sha384_psa );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) );
+ return;
+ }
+
+ status = psa_hash_finish( &sha384_psa, padbuf, sizeof( padbuf ), &hash_size );
+ if( status != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) );
+ return;
+ }
+ MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 48 );
+#else
+ mbedtls_sha512_init( &sha512 );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) );
+
+ mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
+
+ /*
+ * TLSv1.2:
+ * hash = PRF( master, finished_label,
+ * Hash( handshake ) )[0.11]
+ */
+
+#if !defined(MBEDTLS_SHA512_ALT)
+ MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *)
+ sha512.state, sizeof( sha512.state ) );
+#endif
+
+ mbedtls_sha512_finish_ret( &sha512, padbuf );
+ mbedtls_sha512_free( &sha512 );
+#endif
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 48, buf, len );
+
+ MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* MBEDTLS_SHA512_C */
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl )
+{
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) );
+
+ /*
+ * Free our handshake params
+ */
+ mbedtls_ssl_handshake_free( ssl );
+ mbedtls_free( ssl->handshake );
+ ssl->handshake = NULL;
+
+ /*
+ * Free the previous transform and swith in the current one
+ */
+ if( ssl->transform )
+ {
+ mbedtls_ssl_transform_free( ssl->transform );
+ mbedtls_free( ssl->transform );
+ }
+ ssl->transform = ssl->transform_negotiate;
+ ssl->transform_negotiate = NULL;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) );
+}
+
+void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl )
+{
+ int resume = ssl->handshake->resume;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
+ {
+ ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE;
+ ssl->renego_records_seen = 0;
+ }
+#endif
+
+ /*
+ * Free the previous session and switch in the current one
+ */
+ if( ssl->session )
+ {
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ /* RFC 7366 3.1: keep the EtM state */
+ ssl->session_negotiate->encrypt_then_mac =
+ ssl->session->encrypt_then_mac;
+#endif
+
+ mbedtls_ssl_session_free( ssl->session );
+ mbedtls_free( ssl->session );
+ }
+ ssl->session = ssl->session_negotiate;
+ ssl->session_negotiate = NULL;
+
+ /*
+ * Add cache entry
+ */
+ if( ssl->conf->f_set_cache != NULL &&
+ ssl->session->id_len != 0 &&
+ resume == 0 )
+ {
+ if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 )
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->handshake->flight != NULL )
+ {
+ /* Cancel handshake timer */
+ ssl_set_timer( ssl, 0 );
+
+ /* Keep last flight around in case we need to resend it:
+ * we need the handshake and transform structures for that */
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) );
+ }
+ else
+#endif
+ ssl_handshake_wrapup_free_hs_transform( ssl );
+
+ ssl->state++;
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
+}
+
+int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl )
+{
+ int ret, hash_len;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
+
+ ssl_update_out_pointers( ssl, ssl->transform_negotiate );
+
+ ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint );
+
+ /*
+ * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites
+ * may define some other value. Currently (early 2016), no defined
+ * ciphersuite does this (and this is unlikely to change as activity has
+ * moved to TLS 1.3 now) so we can keep the hardcoded 12 here.
+ */
+ hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12;
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ ssl->verify_data_len = hash_len;
+ memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len );
+#endif
+
+ ssl->out_msglen = 4 + hash_len;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED;
+
+ /*
+ * In case of session resuming, invert the client and server
+ * ChangeCipherSpec messages order.
+ */
+ if( ssl->handshake->resume != 0 )
+ {
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
+#endif
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
+#endif
+ }
+ else
+ ssl->state++;
+
+ /*
+ * Switch to our negotiated transform and session parameters for outbound
+ * data.
+ */
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ unsigned char i;
+
+ /* Remember current epoch settings for resending */
+ ssl->handshake->alt_transform_out = ssl->transform_out;
+ memcpy( ssl->handshake->alt_out_ctr, ssl->cur_out_ctr, 8 );
+
+ /* Set sequence_number to zero */
+ memset( ssl->cur_out_ctr + 2, 0, 6 );
+
+ /* Increment epoch */
+ for( i = 2; i > 0; i-- )
+ if( ++ssl->cur_out_ctr[i - 1] != 0 )
+ break;
+
+ /* The loop goes to its end iff the counter is wrapping */
+ if( i == 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
+ return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
+ }
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+ memset( ssl->cur_out_ctr, 0, 8 );
+
+ ssl->transform_out = ssl->transform_negotiate;
+ ssl->session_out = ssl->session_negotiate;
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_activate != NULL )
+ {
+ if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ mbedtls_ssl_send_flight_completed( ssl );
+#endif
+
+ if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
+ return( ret );
+ }
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret );
+ return( ret );
+ }
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+#define SSL_MAX_HASH_LEN 36
+#else
+#define SSL_MAX_HASH_LEN 12
+#endif
+
+int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl )
+{
+ int ret;
+ unsigned int hash_len;
+ unsigned char buf[SSL_MAX_HASH_LEN];
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
+
+ ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 );
+
+ if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
+ return( ret );
+ }
+
+ if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ /* There is currently no ciphersuite using another length with TLS 1.2 */
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ hash_len = 36;
+ else
+#endif
+ hash_len = 12;
+
+ if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED ||
+ ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
+ }
+
+ if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ),
+ buf, hash_len ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+ return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
+ }
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ ssl->verify_data_len = hash_len;
+ memcpy( ssl->peer_verify_data, buf, hash_len );
+#endif
+
+ if( ssl->handshake->resume != 0 )
+ {
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
+#endif
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
+#endif
+ }
+ else
+ ssl->state++;
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ mbedtls_ssl_recv_flight_completed( ssl );
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
+
+ return( 0 );
+}
+
+static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
+{
+ memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) );
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ mbedtls_md5_init( &handshake->fin_md5 );
+ mbedtls_sha1_init( &handshake->fin_sha1 );
+ mbedtls_md5_starts_ret( &handshake->fin_md5 );
+ mbedtls_sha1_starts_ret( &handshake->fin_sha1 );
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ handshake->fin_sha256_psa = psa_hash_operation_init();
+ psa_hash_setup( &handshake->fin_sha256_psa, PSA_ALG_SHA_256 );
+#else
+ mbedtls_sha256_init( &handshake->fin_sha256 );
+ mbedtls_sha256_starts_ret( &handshake->fin_sha256, 0 );
+#endif
+#endif
+#if defined(MBEDTLS_SHA512_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ handshake->fin_sha384_psa = psa_hash_operation_init();
+ psa_hash_setup( &handshake->fin_sha384_psa, PSA_ALG_SHA_384 );
+#else
+ mbedtls_sha512_init( &handshake->fin_sha512 );
+ mbedtls_sha512_starts_ret( &handshake->fin_sha512, 1 );
+#endif
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ handshake->update_checksum = ssl_update_checksum_start;
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
+ defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+ mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs );
+#endif
+
+#if defined(MBEDTLS_DHM_C)
+ mbedtls_dhm_init( &handshake->dhm_ctx );
+#endif
+#if defined(MBEDTLS_ECDH_C)
+ mbedtls_ecdh_init( &handshake->ecdh_ctx );
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+ mbedtls_ecjpake_init( &handshake->ecjpake_ctx );
+#if defined(MBEDTLS_SSL_CLI_C)
+ handshake->ecjpake_cache = NULL;
+ handshake->ecjpake_cache_len = 0;
+#endif
+#endif
+
+#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
+ mbedtls_x509_crt_restart_init( &handshake->ecrs_ctx );
+#endif
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+ handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
+ !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ mbedtls_pk_init( &handshake->peer_pubkey );
+#endif
+}
+
+static void ssl_transform_init( mbedtls_ssl_transform *transform )
+{
+ memset( transform, 0, sizeof(mbedtls_ssl_transform) );
+
+ mbedtls_cipher_init( &transform->cipher_ctx_enc );
+ mbedtls_cipher_init( &transform->cipher_ctx_dec );
+
+ mbedtls_md_init( &transform->md_ctx_enc );
+ mbedtls_md_init( &transform->md_ctx_dec );
+}
+
+void mbedtls_ssl_session_init( mbedtls_ssl_session *session )
+{
+ memset( session, 0, sizeof(mbedtls_ssl_session) );
+}
+
+static int ssl_handshake_init( mbedtls_ssl_context *ssl )
+{
+ /* Clear old handshake information if present */
+ if( ssl->transform_negotiate )
+ mbedtls_ssl_transform_free( ssl->transform_negotiate );
+ if( ssl->session_negotiate )
+ mbedtls_ssl_session_free( ssl->session_negotiate );
+ if( ssl->handshake )
+ mbedtls_ssl_handshake_free( ssl );
+
+ /*
+ * Either the pointers are now NULL or cleared properly and can be freed.
+ * Now allocate missing structures.
+ */
+ if( ssl->transform_negotiate == NULL )
+ {
+ ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) );
+ }
+
+ if( ssl->session_negotiate == NULL )
+ {
+ ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) );
+ }
+
+ if( ssl->handshake == NULL )
+ {
+ ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) );
+ }
+
+ /* All pointers should exist and can be directly freed without issue */
+ if( ssl->handshake == NULL ||
+ ssl->transform_negotiate == NULL ||
+ ssl->session_negotiate == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) );
+
+ mbedtls_free( ssl->handshake );
+ mbedtls_free( ssl->transform_negotiate );
+ mbedtls_free( ssl->session_negotiate );
+
+ ssl->handshake = NULL;
+ ssl->transform_negotiate = NULL;
+ ssl->session_negotiate = NULL;
+
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ }
+
+ /* Initialize structures */
+ mbedtls_ssl_session_init( ssl->session_negotiate );
+ ssl_transform_init( ssl->transform_negotiate );
+ ssl_handshake_params_init( ssl->handshake );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ssl->handshake->alt_transform_out = ssl->transform_out;
+
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
+ else
+ ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
+
+ ssl_set_timer( ssl, 0 );
+ }
+#endif
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
+/* Dummy cookie callbacks for defaults */
+static int ssl_cookie_write_dummy( void *ctx,
+ unsigned char **p, unsigned char *end,
+ const unsigned char *cli_id, size_t cli_id_len )
+{
+ ((void) ctx);
+ ((void) p);
+ ((void) end);
+ ((void) cli_id);
+ ((void) cli_id_len);
+
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+}
+
+static int ssl_cookie_check_dummy( void *ctx,
+ const unsigned char *cookie, size_t cookie_len,
+ const unsigned char *cli_id, size_t cli_id_len )
+{
+ ((void) ctx);
+ ((void) cookie);
+ ((void) cookie_len);
+ ((void) cli_id);
+ ((void) cli_id_len);
+
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+}
+#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
+
+/* Once ssl->out_hdr as the address of the beginning of the
+ * next outgoing record is set, deduce the other pointers.
+ *
+ * Note: For TLS, we save the implicit record sequence number
+ * (entering MAC computation) in the 8 bytes before ssl->out_hdr,
+ * and the caller has to make sure there's space for this.
+ */
+
+static void ssl_update_out_pointers( mbedtls_ssl_context *ssl,
+ mbedtls_ssl_transform *transform )
+{
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ssl->out_ctr = ssl->out_hdr + 3;
+ ssl->out_len = ssl->out_hdr + 11;
+ ssl->out_iv = ssl->out_hdr + 13;
+ }
+ else
+#endif
+ {
+ ssl->out_ctr = ssl->out_hdr - 8;
+ ssl->out_len = ssl->out_hdr + 3;
+ ssl->out_iv = ssl->out_hdr + 5;
+ }
+
+ /* Adjust out_msg to make space for explicit IV, if used. */
+ if( transform != NULL &&
+ ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
+ {
+ ssl->out_msg = ssl->out_iv + transform->ivlen - transform->fixed_ivlen;
+ }
+ else
+ ssl->out_msg = ssl->out_iv;
+}
+
+/* Once ssl->in_hdr as the address of the beginning of the
+ * next incoming record is set, deduce the other pointers.
+ *
+ * Note: For TLS, we save the implicit record sequence number
+ * (entering MAC computation) in the 8 bytes before ssl->in_hdr,
+ * and the caller has to make sure there's space for this.
+ */
+
+static void ssl_update_in_pointers( mbedtls_ssl_context *ssl,
+ mbedtls_ssl_transform *transform )
+{
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ssl->in_ctr = ssl->in_hdr + 3;
+ ssl->in_len = ssl->in_hdr + 11;
+ ssl->in_iv = ssl->in_hdr + 13;
+ }
+ else
+#endif
+ {
+ ssl->in_ctr = ssl->in_hdr - 8;
+ ssl->in_len = ssl->in_hdr + 3;
+ ssl->in_iv = ssl->in_hdr + 5;
+ }
+
+ /* Offset in_msg from in_iv to allow space for explicit IV, if used. */
+ if( transform != NULL &&
+ ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
+ {
+ ssl->in_msg = ssl->in_iv + transform->ivlen - transform->fixed_ivlen;
+ }
+ else
+ ssl->in_msg = ssl->in_iv;
+}
+
+/*
+ * Initialize an SSL context
+ */
+void mbedtls_ssl_init( mbedtls_ssl_context *ssl )
+{
+ memset( ssl, 0, sizeof( mbedtls_ssl_context ) );
+}
+
+/*
+ * Setup an SSL context
+ */
+
+static void ssl_reset_in_out_pointers( mbedtls_ssl_context *ssl )
+{
+ /* Set the incoming and outgoing record pointers. */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ssl->out_hdr = ssl->out_buf;
+ ssl->in_hdr = ssl->in_buf;
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+ {
+ ssl->out_hdr = ssl->out_buf + 8;
+ ssl->in_hdr = ssl->in_buf + 8;
+ }
+
+ /* Derive other internal pointers. */
+ ssl_update_out_pointers( ssl, NULL /* no transform enabled */ );
+ ssl_update_in_pointers ( ssl, NULL /* no transform enabled */ );
+}
+
+int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
+ const mbedtls_ssl_config *conf )
+{
+ int ret;
+
+ ssl->conf = conf;
+
+ /*
+ * Prepare base structures
+ */
+
+ /* Set to NULL in case of an error condition */
+ ssl->out_buf = NULL;
+
+ ssl->in_buf = mbedtls_calloc( 1, MBEDTLS_SSL_IN_BUFFER_LEN );
+ if( ssl->in_buf == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_IN_BUFFER_LEN) );
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto error;
+ }
+
+ ssl->out_buf = mbedtls_calloc( 1, MBEDTLS_SSL_OUT_BUFFER_LEN );
+ if( ssl->out_buf == NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_OUT_BUFFER_LEN) );
+ ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+ goto error;
+ }
+
+ ssl_reset_in_out_pointers( ssl );
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ goto error;
+
+ return( 0 );
+
+error:
+ mbedtls_free( ssl->in_buf );
+ mbedtls_free( ssl->out_buf );
+
+ ssl->conf = NULL;
+
+ ssl->in_buf = NULL;
+ ssl->out_buf = NULL;
+
+ ssl->in_hdr = NULL;
+ ssl->in_ctr = NULL;
+ ssl->in_len = NULL;
+ ssl->in_iv = NULL;
+ ssl->in_msg = NULL;
+
+ ssl->out_hdr = NULL;
+ ssl->out_ctr = NULL;
+ ssl->out_len = NULL;
+ ssl->out_iv = NULL;
+ ssl->out_msg = NULL;
+
+ return( ret );
+}
+
+/*
+ * Reset an initialized and used SSL context for re-use while retaining
+ * all application-set variables, function pointers and data.
+ *
+ * If partial is non-zero, keep data in the input buffer and client ID.
+ * (Use when a DTLS client reconnects from the same port.)
+ */
+static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial )
+{
+ int ret;
+
+#if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || \
+ !defined(MBEDTLS_SSL_SRV_C)
+ ((void) partial);
+#endif
+
+ ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
+
+ /* Cancel any possibly running timer */
+ ssl_set_timer( ssl, 0 );
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
+ ssl->renego_records_seen = 0;
+
+ ssl->verify_data_len = 0;
+ memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
+ memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
+#endif
+ ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
+
+ ssl->in_offt = NULL;
+ ssl_reset_in_out_pointers( ssl );
+
+ ssl->in_msgtype = 0;
+ ssl->in_msglen = 0;
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ ssl->next_record_offset = 0;
+ ssl->in_epoch = 0;
+#endif
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ ssl_dtls_replay_reset( ssl );
+#endif
+
+ ssl->in_hslen = 0;
+ ssl->nb_zero = 0;
+
+ ssl->keep_current_message = 0;
+
+ ssl->out_msgtype = 0;
+ ssl->out_msglen = 0;
+ ssl->out_left = 0;
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+ if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED )
+ ssl->split_done = 0;
+#endif
+
+ memset( ssl->cur_out_ctr, 0, sizeof( ssl->cur_out_ctr ) );
+
+ ssl->transform_in = NULL;
+ ssl->transform_out = NULL;
+
+ ssl->session_in = NULL;
+ ssl->session_out = NULL;
+
+ memset( ssl->out_buf, 0, MBEDTLS_SSL_OUT_BUFFER_LEN );
+
+#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
+ if( partial == 0 )
+#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
+ {
+ ssl->in_left = 0;
+ memset( ssl->in_buf, 0, MBEDTLS_SSL_IN_BUFFER_LEN );
+ }
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_reset != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) );
+ if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret );
+ return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+
+ if( ssl->transform )
+ {
+ mbedtls_ssl_transform_free( ssl->transform );
+ mbedtls_free( ssl->transform );
+ ssl->transform = NULL;
+ }
+
+ if( ssl->session )
+ {
+ mbedtls_ssl_session_free( ssl->session );
+ mbedtls_free( ssl->session );
+ ssl->session = NULL;
+ }
+
+#if defined(MBEDTLS_SSL_ALPN)
+ ssl->alpn_chosen = NULL;
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
+#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE)
+ if( partial == 0 )
+#endif
+ {
+ mbedtls_free( ssl->cli_id );
+ ssl->cli_id = NULL;
+ ssl->cli_id_len = 0;
+ }
+#endif
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ return( ret );
+
+ return( 0 );
+}
+
+/*
+ * Reset an initialized and used SSL context for re-use while retaining
+ * all application-set variables, function pointers and data.
+ */
+int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl )
+{
+ return( ssl_session_reset_int( ssl, 0 ) );
+}
+
+/*
+ * SSL set accessors
+ */
+void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint )
+{
+ conf->endpoint = endpoint;
+}
+
+void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport )
+{
+ conf->transport = transport;
+}
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode )
+{
+ conf->anti_replay = mode;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
+void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit )
+{
+ conf->badmac_limit = limit;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+
+void mbedtls_ssl_set_datagram_packing( mbedtls_ssl_context *ssl,
+ unsigned allow_packing )
+{
+ ssl->disable_datagram_packing = !allow_packing;
+}
+
+void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf,
+ uint32_t min, uint32_t max )
+{
+ conf->hs_timeout_min = min;
+ conf->hs_timeout_max = max;
+}
+#endif
+
+void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode )
+{
+ conf->authmode = authmode;
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf,
+ int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
+ void *p_vrfy )
+{
+ conf->f_vrfy = f_vrfy;
+ conf->p_vrfy = p_vrfy;
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf,
+ int (*f_rng)(void *, unsigned char *, size_t),
+ void *p_rng )
+{
+ conf->f_rng = f_rng;
+ conf->p_rng = p_rng;
+}
+
+void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
+ void (*f_dbg)(void *, int, const char *, int, const char *),
+ void *p_dbg )
+{
+ conf->f_dbg = f_dbg;
+ conf->p_dbg = p_dbg;
+}
+
+void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl,
+ void *p_bio,
+ mbedtls_ssl_send_t *f_send,
+ mbedtls_ssl_recv_t *f_recv,
+ mbedtls_ssl_recv_timeout_t *f_recv_timeout )
+{
+ ssl->p_bio = p_bio;
+ ssl->f_send = f_send;
+ ssl->f_recv = f_recv;
+ ssl->f_recv_timeout = f_recv_timeout;
+}
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+void mbedtls_ssl_set_mtu( mbedtls_ssl_context *ssl, uint16_t mtu )
+{
+ ssl->mtu = mtu;
+}
+#endif
+
+void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout )
+{
+ conf->read_timeout = timeout;
+}
+
+void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
+ void *p_timer,
+ mbedtls_ssl_set_timer_t *f_set_timer,
+ mbedtls_ssl_get_timer_t *f_get_timer )
+{
+ ssl->p_timer = p_timer;
+ ssl->f_set_timer = f_set_timer;
+ ssl->f_get_timer = f_get_timer;
+
+ /* Make sure we start with no timer running */
+ ssl_set_timer( ssl, 0 );
+}
+
+#if defined(MBEDTLS_SSL_SRV_C)
+void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf,
+ void *p_cache,
+ int (*f_get_cache)(void *, mbedtls_ssl_session *),
+ int (*f_set_cache)(void *, const mbedtls_ssl_session *) )
+{
+ conf->p_cache = p_cache;
+ conf->f_get_cache = f_get_cache;
+ conf->f_set_cache = f_set_cache;
+}
+#endif /* MBEDTLS_SSL_SRV_C */
+
+#if defined(MBEDTLS_SSL_CLI_C)
+int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session )
+{
+ int ret;
+
+ if( ssl == NULL ||
+ session == NULL ||
+ ssl->session_negotiate == NULL ||
+ ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ if( ( ret = mbedtls_ssl_session_copy( ssl->session_negotiate,
+ session ) ) != 0 )
+ return( ret );
+
+ ssl->handshake->resume = 1;
+
+ return( 0 );
+}
+#endif /* MBEDTLS_SSL_CLI_C */
+
+void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf,
+ const int *ciphersuites )
+{
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites;
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites;
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites;
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites;
+}
+
+void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf,
+ const int *ciphersuites,
+ int major, int minor )
+{
+ if( major != MBEDTLS_SSL_MAJOR_VERSION_3 )
+ return;
+
+ if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 )
+ return;
+
+ conf->ciphersuite_list[minor] = ciphersuites;
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf,
+ const mbedtls_x509_crt_profile *profile )
+{
+ conf->cert_profile = profile;
+}
+
+/* Append a new keycert entry to a (possibly empty) list */
+static int ssl_append_key_cert( mbedtls_ssl_key_cert **head,
+ mbedtls_x509_crt *cert,
+ mbedtls_pk_context *key )
+{
+ mbedtls_ssl_key_cert *new_cert;
+
+ new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
+ if( new_cert == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ new_cert->cert = cert;
+ new_cert->key = key;
+ new_cert->next = NULL;
+
+ /* Update head is the list was null, else add to the end */
+ if( *head == NULL )
+ {
+ *head = new_cert;
+ }
+ else
+ {
+ mbedtls_ssl_key_cert *cur = *head;
+ while( cur->next != NULL )
+ cur = cur->next;
+ cur->next = new_cert;
+ }
+
+ return( 0 );
+}
+
+int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
+ mbedtls_x509_crt *own_cert,
+ mbedtls_pk_context *pk_key )
+{
+ return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) );
+}
+
+void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
+ mbedtls_x509_crt *ca_chain,
+ mbedtls_x509_crl *ca_crl )
+{
+ conf->ca_chain = ca_chain;
+ conf->ca_crl = ca_crl;
+
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+ /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb()
+ * cannot be used together. */
+ conf->f_ca_cb = NULL;
+ conf->p_ca_cb = NULL;
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+}
+
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+void mbedtls_ssl_conf_ca_cb( mbedtls_ssl_config *conf,
+ mbedtls_x509_crt_ca_cb_t f_ca_cb,
+ void *p_ca_cb )
+{
+ conf->f_ca_cb = f_ca_cb;
+ conf->p_ca_cb = p_ca_cb;
+
+ /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb()
+ * cannot be used together. */
+ conf->ca_chain = NULL;
+ conf->ca_crl = NULL;
+}
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
+ mbedtls_x509_crt *own_cert,
+ mbedtls_pk_context *pk_key )
+{
+ return( ssl_append_key_cert( &ssl->handshake->sni_key_cert,
+ own_cert, pk_key ) );
+}
+
+void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl,
+ mbedtls_x509_crt *ca_chain,
+ mbedtls_x509_crl *ca_crl )
+{
+ ssl->handshake->sni_ca_chain = ca_chain;
+ ssl->handshake->sni_ca_crl = ca_crl;
+}
+
+void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl,
+ int authmode )
+{
+ ssl->handshake->sni_authmode = authmode;
+}
+#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+void mbedtls_ssl_set_verify( mbedtls_ssl_context *ssl,
+ int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
+ void *p_vrfy )
+{
+ ssl->f_vrfy = f_vrfy;
+ ssl->p_vrfy = p_vrfy;
+}
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+/*
+ * Set EC J-PAKE password for current handshake
+ */
+int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl,
+ const unsigned char *pw,
+ size_t pw_len )
+{
+ mbedtls_ecjpake_role role;
+
+ if( ssl->handshake == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ role = MBEDTLS_ECJPAKE_SERVER;
+ else
+ role = MBEDTLS_ECJPAKE_CLIENT;
+
+ return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx,
+ role,
+ MBEDTLS_MD_SHA256,
+ MBEDTLS_ECP_DP_SECP256R1,
+ pw, pw_len ) );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
+
+#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
+
+static void ssl_conf_remove_psk( mbedtls_ssl_config *conf )
+{
+ /* Remove reference to existing PSK, if any. */
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ if( conf->psk_opaque != 0 )
+ {
+ /* The maintenance of the PSK key slot is the
+ * user's responsibility. */
+ conf->psk_opaque = 0;
+ }
+ /* This and the following branch should never
+ * be taken simultaenously as we maintain the
+ * invariant that raw and opaque PSKs are never
+ * configured simultaneously. As a safeguard,
+ * though, `else` is omitted here. */
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ if( conf->psk != NULL )
+ {
+ mbedtls_platform_zeroize( conf->psk, conf->psk_len );
+
+ mbedtls_free( conf->psk );
+ conf->psk = NULL;
+ conf->psk_len = 0;
+ }
+
+ /* Remove reference to PSK identity, if any. */
+ if( conf->psk_identity != NULL )
+ {
+ mbedtls_free( conf->psk_identity );
+ conf->psk_identity = NULL;
+ conf->psk_identity_len = 0;
+ }
+}
+
+/* This function assumes that PSK identity in the SSL config is unset.
+ * It checks that the provided identity is well-formed and attempts
+ * to make a copy of it in the SSL config.
+ * On failure, the PSK identity in the config remains unset. */
+static int ssl_conf_set_psk_identity( mbedtls_ssl_config *conf,
+ unsigned char const *psk_identity,
+ size_t psk_identity_len )
+{
+ /* Identity len will be encoded on two bytes */
+ if( psk_identity == NULL ||
+ ( psk_identity_len >> 16 ) != 0 ||
+ psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ conf->psk_identity = mbedtls_calloc( 1, psk_identity_len );
+ if( conf->psk_identity == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ conf->psk_identity_len = psk_identity_len;
+ memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
+
+ return( 0 );
+}
+
+int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
+ const unsigned char *psk, size_t psk_len,
+ const unsigned char *psk_identity, size_t psk_identity_len )
+{
+ int ret;
+ /* Remove opaque/raw PSK + PSK Identity */
+ ssl_conf_remove_psk( conf );
+
+ /* Check and set raw PSK */
+ if( psk == NULL || psk_len > MBEDTLS_PSK_MAX_LEN )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+ conf->psk_len = psk_len;
+ memcpy( conf->psk, psk, conf->psk_len );
+
+ /* Check and set PSK Identity */
+ ret = ssl_conf_set_psk_identity( conf, psk_identity, psk_identity_len );
+ if( ret != 0 )
+ ssl_conf_remove_psk( conf );
+
+ return( ret );
+}
+
+static void ssl_remove_psk( mbedtls_ssl_context *ssl )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ if( ssl->handshake->psk_opaque != 0 )
+ {
+ ssl->handshake->psk_opaque = 0;
+ }
+ else
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+ if( ssl->handshake->psk != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->handshake->psk,
+ ssl->handshake->psk_len );
+ mbedtls_free( ssl->handshake->psk );
+ ssl->handshake->psk_len = 0;
+ }
+}
+
+int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
+ const unsigned char *psk, size_t psk_len )
+{
+ if( psk == NULL || ssl->handshake == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( psk_len > MBEDTLS_PSK_MAX_LEN )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl_remove_psk( ssl );
+
+ if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ ssl->handshake->psk_len = psk_len;
+ memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
+
+ return( 0 );
+}
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+int mbedtls_ssl_conf_psk_opaque( mbedtls_ssl_config *conf,
+ psa_key_handle_t psk_slot,
+ const unsigned char *psk_identity,
+ size_t psk_identity_len )
+{
+ int ret;
+ /* Clear opaque/raw PSK + PSK Identity, if present. */
+ ssl_conf_remove_psk( conf );
+
+ /* Check and set opaque PSK */
+ if( psk_slot == 0 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ conf->psk_opaque = psk_slot;
+
+ /* Check and set PSK Identity */
+ ret = ssl_conf_set_psk_identity( conf, psk_identity,
+ psk_identity_len );
+ if( ret != 0 )
+ ssl_conf_remove_psk( conf );
+
+ return( ret );
+}
+
+int mbedtls_ssl_set_hs_psk_opaque( mbedtls_ssl_context *ssl,
+ psa_key_handle_t psk_slot )
+{
+ if( psk_slot == 0 || ssl->handshake == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl_remove_psk( ssl );
+ ssl->handshake->psk_opaque = psk_slot;
+ return( 0 );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
+ int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
+ size_t),
+ void *p_psk )
+{
+ conf->f_psk = f_psk;
+ conf->p_psk = p_psk;
+}
+#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G )
+{
+ int ret;
+
+ if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 ||
+ ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 )
+ {
+ mbedtls_mpi_free( &conf->dhm_P );
+ mbedtls_mpi_free( &conf->dhm_G );
+ return( ret );
+ }
+
+ return( 0 );
+}
+#endif /* MBEDTLS_DEPRECATED_REMOVED */
+
+int mbedtls_ssl_conf_dh_param_bin( mbedtls_ssl_config *conf,
+ const unsigned char *dhm_P, size_t P_len,
+ const unsigned char *dhm_G, size_t G_len )
+{
+ int ret;
+
+ if( ( ret = mbedtls_mpi_read_binary( &conf->dhm_P, dhm_P, P_len ) ) != 0 ||
+ ( ret = mbedtls_mpi_read_binary( &conf->dhm_G, dhm_G, G_len ) ) != 0 )
+ {
+ mbedtls_mpi_free( &conf->dhm_P );
+ mbedtls_mpi_free( &conf->dhm_G );
+ return( ret );
+ }
+
+ return( 0 );
+}
+
+int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx )
+{
+ int ret;
+
+ if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 ||
+ ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 )
+ {
+ mbedtls_mpi_free( &conf->dhm_P );
+ mbedtls_mpi_free( &conf->dhm_G );
+ return( ret );
+ }
+
+ return( 0 );
+}
+#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
+/*
+ * Set the minimum length for Diffie-Hellman parameters
+ */
+void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
+ unsigned int bitlen )
+{
+ conf->dhm_min_bitlen = bitlen;
+}
+#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
+
+#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+/*
+ * Set allowed/preferred hashes for handshake signatures
+ */
+void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf,
+ const int *hashes )
+{
+ conf->sig_hashes = hashes;
+}
+#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
+
+#if defined(MBEDTLS_ECP_C)
+/*
+ * Set the allowed elliptic curves
+ */
+void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
+ const mbedtls_ecp_group_id *curve_list )
+{
+ conf->curve_list = curve_list;
+}
+#endif /* MBEDTLS_ECP_C */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname )
+{
+ /* Initialize to suppress unnecessary compiler warning */
+ size_t hostname_len = 0;
+
+ /* Check if new hostname is valid before
+ * making any change to current one */
+ if( hostname != NULL )
+ {
+ hostname_len = strlen( hostname );
+
+ if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ /* Now it's clear that we will overwrite the old hostname,
+ * so we can free it safely */
+
+ if( ssl->hostname != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) );
+ mbedtls_free( ssl->hostname );
+ }
+
+ /* Passing NULL as hostname shall clear the old one */
+
+ if( hostname == NULL )
+ {
+ ssl->hostname = NULL;
+ }
+ else
+ {
+ ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );
+ if( ssl->hostname == NULL )
+ return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+
+ memcpy( ssl->hostname, hostname, hostname_len );
+
+ ssl->hostname[hostname_len] = '\0';
+ }
+
+ return( 0 );
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf,
+ int (*f_sni)(void *, mbedtls_ssl_context *,
+ const unsigned char *, size_t),
+ void *p_sni )
+{
+ conf->f_sni = f_sni;
+ conf->p_sni = p_sni;
+}
+#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
+
+#if defined(MBEDTLS_SSL_ALPN)
+int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos )
+{
+ size_t cur_len, tot_len;
+ const char **p;
+
+ /*
+ * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings
+ * MUST NOT be truncated."
+ * We check lengths now rather than later.
+ */
+ tot_len = 0;
+ for( p = protos; *p != NULL; p++ )
+ {
+ cur_len = strlen( *p );
+ tot_len += cur_len;
+
+ if( cur_len == 0 || cur_len > 255 || tot_len > 65535 )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ conf->alpn_list = protos;
+
+ return( 0 );
+}
+
+const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
+{
+ return( ssl->alpn_chosen );
+}
+#endif /* MBEDTLS_SSL_ALPN */
+
+void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
+{
+ conf->max_major_ver = major;
+ conf->max_minor_ver = minor;
+}
+
+void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor )
+{
+ conf->min_major_ver = major;
+ conf->min_minor_ver = minor;
+}
+
+#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
+void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback )
+{
+ conf->fallback = fallback;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_SRV_C)
+void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
+ char cert_req_ca_list )
+{
+ conf->cert_req_ca_list = cert_req_ca_list;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
+{
+ conf->encrypt_then_mac = etm;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems )
+{
+ conf->extended_ms = ems;
+}
+#endif
+
+#if defined(MBEDTLS_ARC4_C)
+void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 )
+{
+ conf->arc4_disabled = arc4;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
+{
+ if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
+ ssl_mfl_code_to_length( mfl_code ) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ conf->mfl_code = mfl_code;
+
+ return( 0 );
+}
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate )
+{
+ conf->trunc_hmac = truncate;
+}
+#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
+
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split )
+{
+ conf->cbc_record_splitting = split;
+}
+#endif
+
+void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
+{
+ conf->allow_legacy_renegotiation = allow_legacy;
+}
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation )
+{
+ conf->disable_renegotiation = renegotiation;
+}
+
+void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records )
+{
+ conf->renego_max_records = max_records;
+}
+
+void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf,
+ const unsigned char period[8] )
+{
+ memcpy( conf->renego_period, period, 8 );
+}
+#endif /* MBEDTLS_SSL_RENEGOTIATION */
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+#if defined(MBEDTLS_SSL_CLI_C)
+void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets )
+{
+ conf->session_tickets = use_tickets;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_SRV_C)
+void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf,
+ mbedtls_ssl_ticket_write_t *f_ticket_write,
+ mbedtls_ssl_ticket_parse_t *f_ticket_parse,
+ void *p_ticket )
+{
+ conf->f_ticket_write = f_ticket_write;
+ conf->f_ticket_parse = f_ticket_parse;
+ conf->p_ticket = p_ticket;
+}
+#endif
+#endif /* MBEDTLS_SSL_SESSION_TICKETS */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf,
+ mbedtls_ssl_export_keys_t *f_export_keys,
+ void *p_export_keys )
+{
+ conf->f_export_keys = f_export_keys;
+ conf->p_export_keys = p_export_keys;
+}
+#endif
+
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+void mbedtls_ssl_conf_async_private_cb(
+ mbedtls_ssl_config *conf,
+ mbedtls_ssl_async_sign_t *f_async_sign,
+ mbedtls_ssl_async_decrypt_t *f_async_decrypt,
+ mbedtls_ssl_async_resume_t *f_async_resume,
+ mbedtls_ssl_async_cancel_t *f_async_cancel,
+ void *async_config_data )
+{
+ conf->f_async_sign_start = f_async_sign;
+ conf->f_async_decrypt_start = f_async_decrypt;
+ conf->f_async_resume = f_async_resume;
+ conf->f_async_cancel = f_async_cancel;
+ conf->p_async_config_data = async_config_data;
+}
+
+void *mbedtls_ssl_conf_get_async_config_data( const mbedtls_ssl_config *conf )
+{
+ return( conf->p_async_config_data );
+}
+
+void *mbedtls_ssl_get_async_operation_data( const mbedtls_ssl_context *ssl )
+{
+ if( ssl->handshake == NULL )
+ return( NULL );
+ else
+ return( ssl->handshake->user_async_ctx );
+}
+
+void mbedtls_ssl_set_async_operation_data( mbedtls_ssl_context *ssl,
+ void *ctx )
+{
+ if( ssl->handshake != NULL )
+ ssl->handshake->user_async_ctx = ctx;
+}
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+
+/*
+ * SSL get accessors
+ */
+size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl )
+{
+ return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
+}
+
+int mbedtls_ssl_check_pending( const mbedtls_ssl_context *ssl )
+{
+ /*
+ * Case A: We're currently holding back
+ * a message for further processing.
+ */
+
+ if( ssl->keep_current_message == 1 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: record held back for processing" ) );
+ return( 1 );
+ }
+
+ /*
+ * Case B: Further records are pending in the current datagram.
+ */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->in_left > ssl->next_record_offset )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: more records within current datagram" ) );
+ return( 1 );
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+ /*
+ * Case C: A handshake message is being processed.
+ */
+
+ if( ssl->in_hslen > 0 && ssl->in_hslen < ssl->in_msglen )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: more handshake messages within current record" ) );
+ return( 1 );
+ }
+
+ /*
+ * Case D: An application data message is being processed
+ */
+ if( ssl->in_offt != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: application data record is being processed" ) );
+ return( 1 );
+ }
+
+ /*
+ * In all other cases, the rest of the message can be dropped.
+ * As in ssl_get_next_record, this needs to be adapted if
+ * we implement support for multiple alerts in single records.
+ */
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: nothing pending" ) );
+ return( 0 );
+}
+
+uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
+{
+ if( ssl->session != NULL )
+ return( ssl->session->verify_result );
+
+ if( ssl->session_negotiate != NULL )
+ return( ssl->session_negotiate->verify_result );
+
+ return( 0xFFFFFFFF );
+}
+
+const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
+{
+ if( ssl == NULL || ssl->session == NULL )
+ return( NULL );
+
+ return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
+}
+
+const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
+{
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ switch( ssl->minor_ver )
+ {
+ case MBEDTLS_SSL_MINOR_VERSION_2:
+ return( "DTLSv1.0" );
+
+ case MBEDTLS_SSL_MINOR_VERSION_3:
+ return( "DTLSv1.2" );
+
+ default:
+ return( "unknown (DTLS)" );
+ }
+ }
+#endif
+
+ switch( ssl->minor_ver )
+ {
+ case MBEDTLS_SSL_MINOR_VERSION_0:
+ return( "SSLv3.0" );
+
+ case MBEDTLS_SSL_MINOR_VERSION_1:
+ return( "TLSv1.0" );
+
+ case MBEDTLS_SSL_MINOR_VERSION_2:
+ return( "TLSv1.1" );
+
+ case MBEDTLS_SSL_MINOR_VERSION_3:
+ return( "TLSv1.2" );
+
+ default:
+ return( "unknown" );
+ }
+}
+
+int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
+{
+ size_t transform_expansion = 0;
+ const mbedtls_ssl_transform *transform = ssl->transform_out;
+ unsigned block_size;
+
+ if( transform == NULL )
+ return( (int) mbedtls_ssl_hdr_len( ssl ) );
+
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL )
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+#endif
+
+ switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
+ {
+ case MBEDTLS_MODE_GCM:
+ case MBEDTLS_MODE_CCM:
+ case MBEDTLS_MODE_CHACHAPOLY:
+ case MBEDTLS_MODE_STREAM:
+ transform_expansion = transform->minlen;
+ break;
+
+ case MBEDTLS_MODE_CBC:
+
+ block_size = mbedtls_cipher_get_block_size(
+ &transform->cipher_ctx_enc );
+
+ /* Expansion due to the addition of the MAC. */
+ transform_expansion += transform->maclen;
+
+ /* Expansion due to the addition of CBC padding;
+ * Theoretically up to 256 bytes, but we never use
+ * more than the block size of the underlying cipher. */
+ transform_expansion += block_size;
+
+ /* For TLS 1.1 or higher, an explicit IV is added
+ * after the record header. */
+#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
+ transform_expansion += block_size;
+#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
+
+ break;
+
+ default:
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) );
+}
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
+{
+ size_t max_len;
+
+ /*
+ * Assume mfl_code is correct since it was checked when set
+ */
+ max_len = ssl_mfl_code_to_length( ssl->conf->mfl_code );
+
+ /* Check if a smaller max length was negotiated */
+ if( ssl->session_out != NULL &&
+ ssl_mfl_code_to_length( ssl->session_out->mfl_code ) < max_len )
+ {
+ max_len = ssl_mfl_code_to_length( ssl->session_out->mfl_code );
+ }
+
+ /* During a handshake, use the value being negotiated */
+ if( ssl->session_negotiate != NULL &&
+ ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ) < max_len )
+ {
+ max_len = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code );
+ }
+
+ return( max_len );
+}
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+static size_t ssl_get_current_mtu( const mbedtls_ssl_context *ssl )
+{
+ /* Return unlimited mtu for client hello messages to avoid fragmentation. */
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
+ ( ssl->state == MBEDTLS_SSL_CLIENT_HELLO ||
+ ssl->state == MBEDTLS_SSL_SERVER_HELLO ) )
+ return ( 0 );
+
+ if( ssl->handshake == NULL || ssl->handshake->mtu == 0 )
+ return( ssl->mtu );
+
+ if( ssl->mtu == 0 )
+ return( ssl->handshake->mtu );
+
+ return( ssl->mtu < ssl->handshake->mtu ?
+ ssl->mtu : ssl->handshake->mtu );
+}
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl )
+{
+ size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
+
+#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
+ !defined(MBEDTLS_SSL_PROTO_DTLS)
+ (void) ssl;
+#endif
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+ const size_t mfl = mbedtls_ssl_get_max_frag_len( ssl );
+
+ if( max_len > mfl )
+ max_len = mfl;
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl_get_current_mtu( ssl ) != 0 )
+ {
+ const size_t mtu = ssl_get_current_mtu( ssl );
+ const int ret = mbedtls_ssl_get_record_expansion( ssl );
+ const size_t overhead = (size_t) ret;
+
+ if( ret < 0 )
+ return( ret );
+
+ if( mtu <= overhead )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "MTU too low for record expansion" ) );
+ return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+ }
+
+ if( max_len > mtu - overhead )
+ max_len = mtu - overhead;
+ }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
+ !defined(MBEDTLS_SSL_PROTO_DTLS)
+ ((void) ssl);
+#endif
+
+ return( (int) max_len );
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
+{
+ if( ssl == NULL || ssl->session == NULL )
+ return( NULL );
+
+#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ return( ssl->session->peer_cert );
+#else
+ return( NULL );
+#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_CLI_C)
+int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl,
+ mbedtls_ssl_session *dst )
+{
+ if( ssl == NULL ||
+ dst == NULL ||
+ ssl->session == NULL ||
+ ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
+ {
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ return( mbedtls_ssl_session_copy( dst, ssl->session ) );
+}
+#endif /* MBEDTLS_SSL_CLI_C */
+
+/*
+ * Perform a single step of the SSL handshake
+ */
+int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ ret = mbedtls_ssl_handshake_client_step( ssl );
+#endif
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ ret = mbedtls_ssl_handshake_server_step( ssl );
+#endif
+
+ return( ret );
+}
+
+/*
+ * Perform the SSL handshake
+ */
+int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
+{
+ int ret = 0;
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
+
+ while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ ret = mbedtls_ssl_handshake_step( ssl );
+
+ if( ret != 0 )
+ break;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
+
+ return( ret );
+}
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+#if defined(MBEDTLS_SSL_SRV_C)
+/*
+ * Write HelloRequest to request renegotiation on server
+ */
+static int ssl_write_hello_request( mbedtls_ssl_context *ssl )
+{
+ int ret;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
+
+ ssl->out_msglen = 4;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
+
+ if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
+
+ return( 0 );
+}
+#endif /* MBEDTLS_SSL_SRV_C */
+
+/*
+ * Actually renegotiate current connection, triggered by either:
+ * - any side: calling mbedtls_ssl_renegotiate(),
+ * - client: receiving a HelloRequest during mbedtls_ssl_read(),
+ * - server: receiving any handshake message on server during mbedtls_ssl_read() after
+ * the initial handshake is completed.
+ * If the handshake doesn't complete due to waiting for I/O, it will continue
+ * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
+ */
+static int ssl_start_renegotiation( mbedtls_ssl_context *ssl )
+{
+ int ret;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ return( ret );
+
+ /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
+ * the ServerHello will have message_seq = 1" */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
+ {
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ ssl->handshake->out_msg_seq = 1;
+ else
+ ssl->handshake->in_msg_seq = 1;
+ }
+#endif
+
+ ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
+ ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
+
+ if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
+ return( ret );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
+
+ return( 0 );
+}
+
+/*
+ * Renegotiate current connection on client,
+ * or request renegotiation on server
+ */
+int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
+{
+ int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ /* On server, just send the request */
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
+
+ /* Did we already try/start sending HelloRequest? */
+ if( ssl->out_left != 0 )
+ return( mbedtls_ssl_flush_output( ssl ) );
+
+ return( ssl_write_hello_request( ssl ) );
+ }
+#endif /* MBEDTLS_SSL_SRV_C */
+
+#if defined(MBEDTLS_SSL_CLI_C)
+ /*
+ * On client, either start the renegotiation process or,
+ * if already in progress, continue the handshake
+ */
+ if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
+ {
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
+ return( ret );
+ }
+ }
+ else
+ {
+ if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
+ return( ret );
+ }
+ }
+#endif /* MBEDTLS_SSL_CLI_C */
+
+ return( ret );
+}
+
+/*
+ * Check record counters and renegotiate if they're above the limit.
+ */
+static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl )
+{
+ size_t ep_len = ssl_ep_len( ssl );
+ int in_ctr_cmp;
+ int out_ctr_cmp;
+
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ||
+ ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ||
+ ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED )
+ {
+ return( 0 );
+ }
+
+ in_ctr_cmp = memcmp( ssl->in_ctr + ep_len,
+ ssl->conf->renego_period + ep_len, 8 - ep_len );
+ out_ctr_cmp = memcmp( ssl->cur_out_ctr + ep_len,
+ ssl->conf->renego_period + ep_len, 8 - ep_len );
+
+ if( in_ctr_cmp <= 0 && out_ctr_cmp <= 0 )
+ {
+ return( 0 );
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) );
+ return( mbedtls_ssl_renegotiate( ssl ) );
+}
+#endif /* MBEDTLS_SSL_RENEGOTIATION */
+
+/*
+ * Receive application data decrypted from the SSL layer
+ */
+int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
+{
+ int ret;
+ size_t n;
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
+ return( ret );
+
+ if( ssl->handshake != NULL &&
+ ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
+ {
+ if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
+ return( ret );
+ }
+ }
+#endif
+
+ /*
+ * Check if renegotiation is necessary and/or handshake is
+ * in process. If yes, perform/continue, and fall through
+ * if an unexpected packet is received while the client
+ * is waiting for the ServerHello.
+ *
+ * (There is no equivalent to the last condition on
+ * the server-side as it is not treated as within
+ * a handshake while waiting for the ClientHello
+ * after a renegotiation request.)
+ */
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ ret = ssl_check_ctr_renegotiate( ssl );
+ if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
+ ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
+ return( ret );
+ }
+#endif
+
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ ret = mbedtls_ssl_handshake( ssl );
+ if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
+ ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
+ return( ret );
+ }
+ }
+
+ /* Loop as long as no application data record is available */
+ while( ssl->in_offt == NULL )
+ {
+ /* Start timer if not already running */
+ if( ssl->f_get_timer != NULL &&
+ ssl->f_get_timer( ssl->p_timer ) == -1 )
+ {
+ ssl_set_timer( ssl, ssl->conf->read_timeout );
+ }
+
+ if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
+ {
+ if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
+ return( 0 );
+
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
+ return( ret );
+ }
+
+ if( ssl->in_msglen == 0 &&
+ ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA )
+ {
+ /*
+ * OpenSSL sends empty messages to randomize the IV
+ */
+ if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
+ {
+ if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
+ return( 0 );
+
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
+ return( ret );
+ }
+ }
+
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) );
+
+ /*
+ * - For client-side, expect SERVER_HELLO_REQUEST.
+ * - For server-side, expect CLIENT_HELLO.
+ * - Fail (TLS) or silently drop record (DTLS) in other cases.
+ */
+
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
+ ( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST ||
+ ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) );
+
+ /* With DTLS, drop the packet (probably from last handshake) */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ continue;
+ }
+#endif
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+#endif /* MBEDTLS_SSL_CLI_C */
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
+ ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) );
+
+ /* With DTLS, drop the packet (probably from last handshake) */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ continue;
+ }
+#endif
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+#endif /* MBEDTLS_SSL_SRV_C */
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ /* Determine whether renegotiation attempt should be accepted */
+ if( ! ( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ||
+ ( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
+ ssl->conf->allow_legacy_renegotiation ==
+ MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) ) )
+ {
+ /*
+ * Accept renegotiation request
+ */
+
+ /* DTLS clients need to know renego is server-initiated */
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+ ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
+ {
+ ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
+ }
+#endif
+ ret = ssl_start_renegotiation( ssl );
+ if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
+ ret != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
+ return( ret );
+ }
+ }
+ else
+#endif /* MBEDTLS_SSL_RENEGOTIATION */
+ {
+ /*
+ * Refuse renegotiation
+ */
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) );
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
+ {
+ /* SSLv3 does not have a "no_renegotiation" warning, so
+ we send a fatal alert and abort the connection. */
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_SSL3 */
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
+ {
+ if( ( ret = mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_WARNING,
+ MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 )
+ {
+ return( ret );
+ }
+ }
+ else
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 ||
+ MBEDTLS_SSL_PROTO_TLS1_2 */
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+
+ /* At this point, we don't know whether the renegotiation has been
+ * completed or not. The cases to consider are the following:
+ * 1) The renegotiation is complete. In this case, no new record
+ * has been read yet.
+ * 2) The renegotiation is incomplete because the client received
+ * an application data record while awaiting the ServerHello.
+ * 3) The renegotiation is incomplete because the client received
+ * a non-handshake, non-application data message while awaiting
+ * the ServerHello.
+ * In each of these case, looping will be the proper action:
+ * - For 1), the next iteration will read a new record and check
+ * if it's application data.
+ * - For 2), the loop condition isn't satisfied as application data
+ * is present, hence continue is the same as break
+ * - For 3), the loop condition is satisfied and read_record
+ * will re-deliver the message that was held back by the client
+ * when expecting the ServerHello.
+ */
+ continue;
+ }
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
+ {
+ if( ssl->conf->renego_max_records >= 0 )
+ {
+ if( ++ssl->renego_records_seen > ssl->conf->renego_max_records )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
+ "but not honored by client" ) );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+ }
+ }
+#endif /* MBEDTLS_SSL_RENEGOTIATION */
+
+ /* Fatal and closure alerts handled by mbedtls_ssl_read_record() */
+ if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) );
+ return( MBEDTLS_ERR_SSL_WANT_READ );
+ }
+
+ if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) );
+ return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ ssl->in_offt = ssl->in_msg;
+
+ /* We're going to return something now, cancel timer,
+ * except if handshake (renegotiation) is in progress */
+ if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
+ ssl_set_timer( ssl, 0 );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ /* If we requested renego but received AppData, resend HelloRequest.
+ * Do it now, after setting in_offt, to avoid taking this branch
+ * again if ssl_write_hello_request() returns WANT_WRITE */
+#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
+ if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
+ ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
+ {
+ if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
+ return( ret );
+ }
+ }
+#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+ }
+
+ n = ( len < ssl->in_msglen )
+ ? len : ssl->in_msglen;
+
+ memcpy( buf, ssl->in_offt, n );
+ ssl->in_msglen -= n;
+
+ if( ssl->in_msglen == 0 )
+ {
+ /* all bytes consumed */
+ ssl->in_offt = NULL;
+ ssl->keep_current_message = 0;
+ }
+ else
+ {
+ /* more data available */
+ ssl->in_offt += n;
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) );
+
+ return( (int) n );
+}
+
+/*
+ * Send application data to be encrypted by the SSL layer, taking care of max
+ * fragment length and buffer size.
+ *
+ * According to RFC 5246 Section 6.2.1:
+ *
+ * Zero-length fragments of Application data MAY be sent as they are
+ * potentially useful as a traffic analysis countermeasure.
+ *
+ * Therefore, it is possible that the input message length is 0 and the
+ * corresponding return code is 0 on success.
+ */
+static int ssl_write_real( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ int ret = mbedtls_ssl_get_max_out_record_payload( ssl );
+ const size_t max_len = (size_t) ret;
+
+ if( ret < 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_get_max_out_record_payload", ret );
+ return( ret );
+ }
+
+ if( len > max_len )
+ {
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) "
+ "maximum fragment length: %d > %d",
+ len, max_len ) );
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+ }
+ else
+#endif
+ len = max_len;
+ }
+
+ if( ssl->out_left != 0 )
+ {
+ /*
+ * The user has previously tried to send the data and
+ * MBEDTLS_ERR_SSL_WANT_WRITE or the message was only partially
+ * written. In this case, we expect the high-level write function
+ * (e.g. mbedtls_ssl_write()) to be called with the same parameters
+ */
+ if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
+ return( ret );
+ }
+ }
+ else
+ {
+ /*
+ * The user is trying to send a message the first time, so we need to
+ * copy the data into the internal buffers and setup the data structure
+ * to keep track of partial writes
+ */
+ ssl->out_msglen = len;
+ ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
+ memcpy( ssl->out_msg, buf, len );
+
+ if( ( ret = mbedtls_ssl_write_record( ssl, SSL_FORCE_FLUSH ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
+ return( ret );
+ }
+ }
+
+ return( (int) len );
+}
+
+/*
+ * Write application data, doing 1/n-1 splitting if necessary.
+ *
+ * With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
+ * then the caller will call us again with the same arguments, so
+ * remember whether we already did the split or not.
+ */
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+static int ssl_write_split( mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ int ret;
+
+ if( ssl->conf->cbc_record_splitting ==
+ MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ||
+ len <= 1 ||
+ ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 ||
+ mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc )
+ != MBEDTLS_MODE_CBC )
+ {
+ return( ssl_write_real( ssl, buf, len ) );
+ }
+
+ if( ssl->split_done == 0 )
+ {
+ if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 )
+ return( ret );
+ ssl->split_done = 1;
+ }
+
+ if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 )
+ return( ret );
+ ssl->split_done = 0;
+
+ return( ret + 1 );
+}
+#endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */
+
+/*
+ * Write application data (public-facing wrapper)
+ */
+int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len )
+{
+ int ret;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) );
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
+ return( ret );
+ }
+#endif
+
+ if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
+ return( ret );
+ }
+ }
+
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+ ret = ssl_write_split( ssl, buf, len );
+#else
+ ret = ssl_write_real( ssl, buf, len );
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) );
+
+ return( ret );
+}
+
+/*
+ * Notify the peer that the connection is being closed
+ */
+int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl )
+{
+ int ret;
+
+ if( ssl == NULL || ssl->conf == NULL )
+ return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
+
+ if( ssl->out_left != 0 )
+ return( mbedtls_ssl_flush_output( ssl ) );
+
+ if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
+ {
+ if( ( ret = mbedtls_ssl_send_alert_message( ssl,
+ MBEDTLS_SSL_ALERT_LEVEL_WARNING,
+ MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret );
+ return( ret );
+ }
+ }
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
+
+ return( 0 );
+}
+
+void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform )
+{
+ if( transform == NULL )
+ return;
+
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ deflateEnd( &transform->ctx_deflate );
+ inflateEnd( &transform->ctx_inflate );
+#endif
+
+ mbedtls_cipher_free( &transform->cipher_ctx_enc );
+ mbedtls_cipher_free( &transform->cipher_ctx_dec );
+
+ mbedtls_md_free( &transform->md_ctx_enc );
+ mbedtls_md_free( &transform->md_ctx_dec );
+
+ mbedtls_platform_zeroize( transform, sizeof( mbedtls_ssl_transform ) );
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert )
+{
+ mbedtls_ssl_key_cert *cur = key_cert, *next;
+
+ while( cur != NULL )
+ {
+ next = cur->next;
+ mbedtls_free( cur );
+ cur = next;
+ }
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+
+static void ssl_buffering_free( mbedtls_ssl_context *ssl )
+{
+ unsigned offset;
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+
+ if( hs == NULL )
+ return;
+
+ ssl_free_buffered_record( ssl );
+
+ for( offset = 0; offset < MBEDTLS_SSL_MAX_BUFFERED_HS; offset++ )
+ ssl_buffering_free_slot( ssl, offset );
+}
+
+static void ssl_buffering_free_slot( mbedtls_ssl_context *ssl,
+ uint8_t slot )
+{
+ mbedtls_ssl_handshake_params * const hs = ssl->handshake;
+ mbedtls_ssl_hs_buffer * const hs_buf = &hs->buffering.hs[slot];
+
+ if( slot >= MBEDTLS_SSL_MAX_BUFFERED_HS )
+ return;
+
+ if( hs_buf->is_valid == 1 )
+ {
+ hs->buffering.total_bytes_buffered -= hs_buf->data_len;
+ mbedtls_platform_zeroize( hs_buf->data, hs_buf->data_len );
+ mbedtls_free( hs_buf->data );
+ memset( hs_buf, 0, sizeof( mbedtls_ssl_hs_buffer ) );
+ }
+}
+
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl )
+{
+ mbedtls_ssl_handshake_params *handshake = ssl->handshake;
+
+ if( handshake == NULL )
+ return;
+
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+ if( ssl->conf->f_async_cancel != NULL && handshake->async_in_progress != 0 )
+ {
+ ssl->conf->f_async_cancel( ssl );
+ handshake->async_in_progress = 0;
+ }
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+ mbedtls_md5_free( &handshake->fin_md5 );
+ mbedtls_sha1_free( &handshake->fin_sha1 );
+#endif
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_SHA256_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_abort( &handshake->fin_sha256_psa );
+#else
+ mbedtls_sha256_free( &handshake->fin_sha256 );
+#endif
+#endif
+#if defined(MBEDTLS_SHA512_C)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_hash_abort( &handshake->fin_sha384_psa );
+#else
+ mbedtls_sha512_free( &handshake->fin_sha512 );
+#endif
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#if defined(MBEDTLS_DHM_C)
+ mbedtls_dhm_free( &handshake->dhm_ctx );
+#endif
+#if defined(MBEDTLS_ECDH_C)
+ mbedtls_ecdh_free( &handshake->ecdh_ctx );
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+ mbedtls_ecjpake_free( &handshake->ecjpake_ctx );
+#if defined(MBEDTLS_SSL_CLI_C)
+ mbedtls_free( handshake->ecjpake_cache );
+ handshake->ecjpake_cache = NULL;
+ handshake->ecjpake_cache_len = 0;
+#endif
+#endif
+
+#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
+ defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+ /* explicit void pointer cast for buggy MS compiler */
+ mbedtls_free( (void *) handshake->curves );
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
+ if( handshake->psk != NULL )
+ {
+ mbedtls_platform_zeroize( handshake->psk, handshake->psk_len );
+ mbedtls_free( handshake->psk );
+ }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
+ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+ /*
+ * Free only the linked list wrapper, not the keys themselves
+ * since the belong to the SNI callback
+ */
+ if( handshake->sni_key_cert != NULL )
+ {
+ mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next;
+
+ while( cur != NULL )
+ {
+ next = cur->next;
+ mbedtls_free( cur );
+ cur = next;
+ }
+ }
+#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
+
+#if defined(MBEDTLS_SSL__ECP_RESTARTABLE)
+ mbedtls_x509_crt_restart_free( &handshake->ecrs_ctx );
+ if( handshake->ecrs_peer_cert != NULL )
+ {
+ mbedtls_x509_crt_free( handshake->ecrs_peer_cert );
+ mbedtls_free( handshake->ecrs_peer_cert );
+ }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
+ !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
+ mbedtls_pk_free( &handshake->peer_pubkey );
+#endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ mbedtls_free( handshake->verify_cookie );
+ ssl_flight_free( handshake->flight );
+ ssl_buffering_free( ssl );
+#endif
+
+#if defined(MBEDTLS_ECDH_C) && \
+ defined(MBEDTLS_USE_PSA_CRYPTO)
+ psa_destroy_key( handshake->ecdh_psa_privkey );
+#endif /* MBEDTLS_ECDH_C && MBEDTLS_USE_PSA_CRYPTO */
+
+ mbedtls_platform_zeroize( handshake,
+ sizeof( mbedtls_ssl_handshake_params ) );
+}
+
+void mbedtls_ssl_session_free( mbedtls_ssl_session *session )
+{
+ if( session == NULL )
+ return;
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ ssl_clear_peer_cert( session );
+#endif
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
+ mbedtls_free( session->ticket );
+#endif
+
+ mbedtls_platform_zeroize( session, sizeof( mbedtls_ssl_session ) );
+}
+
+/*
+ * Free an SSL context
+ */
+void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
+{
+ if( ssl == NULL )
+ return;
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) );
+
+ if( ssl->out_buf != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->out_buf, MBEDTLS_SSL_OUT_BUFFER_LEN );
+ mbedtls_free( ssl->out_buf );
+ }
+
+ if( ssl->in_buf != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->in_buf, MBEDTLS_SSL_IN_BUFFER_LEN );
+ mbedtls_free( ssl->in_buf );
+ }
+
+#if defined(MBEDTLS_ZLIB_SUPPORT)
+ if( ssl->compress_buf != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->compress_buf, MBEDTLS_SSL_COMPRESS_BUFFER_LEN );
+ mbedtls_free( ssl->compress_buf );
+ }
+#endif
+
+ if( ssl->transform )
+ {
+ mbedtls_ssl_transform_free( ssl->transform );
+ mbedtls_free( ssl->transform );
+ }
+
+ if( ssl->handshake )
+ {
+ mbedtls_ssl_handshake_free( ssl );
+ mbedtls_ssl_transform_free( ssl->transform_negotiate );
+ mbedtls_ssl_session_free( ssl->session_negotiate );
+
+ mbedtls_free( ssl->handshake );
+ mbedtls_free( ssl->transform_negotiate );
+ mbedtls_free( ssl->session_negotiate );
+ }
+
+ if( ssl->session )
+ {
+ mbedtls_ssl_session_free( ssl->session );
+ mbedtls_free( ssl->session );
+ }
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ if( ssl->hostname != NULL )
+ {
+ mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) );
+ mbedtls_free( ssl->hostname );
+ }
+#endif
+
+#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
+ if( mbedtls_ssl_hw_record_finish != NULL )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) );
+ mbedtls_ssl_hw_record_finish( ssl );
+ }
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
+ mbedtls_free( ssl->cli_id );
+#endif
+
+ MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
+
+ /* Actually clear after last debug message */
+ mbedtls_platform_zeroize( ssl, sizeof( mbedtls_ssl_context ) );
+}
+
+/*
+ * Initialze mbedtls_ssl_config
+ */
+void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
+{
+ memset( conf, 0, sizeof( mbedtls_ssl_config ) );
+}
+
+#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+static int ssl_preset_default_hashes[] = {
+#if defined(MBEDTLS_SHA512_C)
+ MBEDTLS_MD_SHA512,
+ MBEDTLS_MD_SHA384,
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ MBEDTLS_MD_SHA256,
+ MBEDTLS_MD_SHA224,
+#endif
+#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE)
+ MBEDTLS_MD_SHA1,
+#endif
+ MBEDTLS_MD_NONE
+};
+#endif
+
+static int ssl_preset_suiteb_ciphersuites[] = {
+ MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+ MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+ 0
+};
+
+#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+static int ssl_preset_suiteb_hashes[] = {
+ MBEDTLS_MD_SHA256,
+ MBEDTLS_MD_SHA384,
+ MBEDTLS_MD_NONE
+};
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
+ MBEDTLS_ECP_DP_SECP256R1,
+ MBEDTLS_ECP_DP_SECP384R1,
+ MBEDTLS_ECP_DP_NONE
+};
+#endif
+
+/*
+ * Load default in mbedtls_ssl_config
+ */
+int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
+ int endpoint, int transport, int preset )
+{
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
+ int ret;
+#endif
+
+ /* Use the functions here so that they are covered in tests,
+ * but otherwise access member directly for efficiency */
+ mbedtls_ssl_conf_endpoint( conf, endpoint );
+ mbedtls_ssl_conf_transport( conf, transport );
+
+ /*
+ * Things that are common to all presets
+ */
+#if defined(MBEDTLS_SSL_CLI_C)
+ if( endpoint == MBEDTLS_SSL_IS_CLIENT )
+ {
+ conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+ conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED;
+#endif
+ }
+#endif
+
+#if defined(MBEDTLS_ARC4_C)
+ conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+ conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+ conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+ conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
+ conf->f_cookie_write = ssl_cookie_write_dummy;
+ conf->f_cookie_check = ssl_cookie_check_dummy;
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+ conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_SRV_C)
+ conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED;
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
+ conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;
+#endif
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+ conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT;
+ memset( conf->renego_period, 0x00, 2 );
+ memset( conf->renego_period + 2, 0xFF, 6 );
+#endif
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
+ if( endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ const unsigned char dhm_p[] =
+ MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN;
+ const unsigned char dhm_g[] =
+ MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN;
+
+ if ( ( ret = mbedtls_ssl_conf_dh_param_bin( conf,
+ dhm_p, sizeof( dhm_p ),
+ dhm_g, sizeof( dhm_g ) ) ) != 0 )
+ {
+ return( ret );
+ }
+ }
+#endif
+
+ /*
+ * Preset-specific defaults
+ */
+ switch( preset )
+ {
+ /*
+ * NSA Suite B
+ */
+ case MBEDTLS_SSL_PRESET_SUITEB:
+ conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
+ conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */
+ conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
+ conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
+
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
+ ssl_preset_suiteb_ciphersuites;
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ conf->cert_profile = &mbedtls_x509_crt_profile_suiteb;
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+ conf->sig_hashes = ssl_preset_suiteb_hashes;
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+ conf->curve_list = ssl_preset_suiteb_curves;
+#endif
+ break;
+
+ /*
+ * Default
+ */
+ default:
+ conf->min_major_ver = ( MBEDTLS_SSL_MIN_MAJOR_VERSION >
+ MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION ) ?
+ MBEDTLS_SSL_MIN_MAJOR_VERSION :
+ MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION;
+ conf->min_minor_ver = ( MBEDTLS_SSL_MIN_MINOR_VERSION >
+ MBEDTLS_SSL_MIN_VALID_MINOR_VERSION ) ?
+ MBEDTLS_SSL_MIN_MINOR_VERSION :
+ MBEDTLS_SSL_MIN_VALID_MINOR_VERSION;
+ conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
+ conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2;
+#endif
+
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
+ conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
+ mbedtls_ssl_list_ciphersuites();
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ conf->cert_profile = &mbedtls_x509_crt_profile_default;
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+ conf->sig_hashes = ssl_preset_default_hashes;
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+ conf->curve_list = mbedtls_ecp_grp_id_list();
+#endif
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
+ conf->dhm_min_bitlen = 1024;
+#endif
+ }
+
+ return( 0 );
+}
+
+/*
+ * Free mbedtls_ssl_config
+ */
+void mbedtls_ssl_config_free( mbedtls_ssl_config *conf )
+{
+#if defined(MBEDTLS_DHM_C)
+ mbedtls_mpi_free( &conf->dhm_P );
+ mbedtls_mpi_free( &conf->dhm_G );
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
+ if( conf->psk != NULL )
+ {
+ mbedtls_platform_zeroize( conf->psk, conf->psk_len );
+ mbedtls_free( conf->psk );
+ conf->psk = NULL;
+ conf->psk_len = 0;
+ }
+
+ if( conf->psk_identity != NULL )
+ {
+ mbedtls_platform_zeroize( conf->psk_identity, conf->psk_identity_len );
+ mbedtls_free( conf->psk_identity );
+ conf->psk_identity = NULL;
+ conf->psk_identity_len = 0;
+ }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ ssl_key_cert_free( conf->key_cert );
+#endif
+
+ mbedtls_platform_zeroize( conf, sizeof( mbedtls_ssl_config ) );
+}
+
+#if defined(MBEDTLS_PK_C) && \
+ ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) )
+/*
+ * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX
+ */
+unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk )
+{
+#if defined(MBEDTLS_RSA_C)
+ if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) )
+ return( MBEDTLS_SSL_SIG_RSA );
+#endif
+#if defined(MBEDTLS_ECDSA_C)
+ if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) )
+ return( MBEDTLS_SSL_SIG_ECDSA );
+#endif
+ return( MBEDTLS_SSL_SIG_ANON );
+}
+
+unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type )
+{
+ switch( type ) {
+ case MBEDTLS_PK_RSA:
+ return( MBEDTLS_SSL_SIG_RSA );
+ case MBEDTLS_PK_ECDSA:
+ case MBEDTLS_PK_ECKEY:
+ return( MBEDTLS_SSL_SIG_ECDSA );
+ default:
+ return( MBEDTLS_SSL_SIG_ANON );
+ }
+}
+
+mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig )
+{
+ switch( sig )
+ {
+#if defined(MBEDTLS_RSA_C)
+ case MBEDTLS_SSL_SIG_RSA:
+ return( MBEDTLS_PK_RSA );
+#endif
+#if defined(MBEDTLS_ECDSA_C)
+ case MBEDTLS_SSL_SIG_ECDSA:
+ return( MBEDTLS_PK_ECDSA );
+#endif
+ default:
+ return( MBEDTLS_PK_NONE );
+ }
+}
+#endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
+ defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+
+/* Find an entry in a signature-hash set matching a given hash algorithm. */
+mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set,
+ mbedtls_pk_type_t sig_alg )
+{
+ switch( sig_alg )
+ {
+ case MBEDTLS_PK_RSA:
+ return( set->rsa );
+ case MBEDTLS_PK_ECDSA:
+ return( set->ecdsa );
+ default:
+ return( MBEDTLS_MD_NONE );
+ }
+}
+
+/* Add a signature-hash-pair to a signature-hash set */
+void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set,
+ mbedtls_pk_type_t sig_alg,
+ mbedtls_md_type_t md_alg )
+{
+ switch( sig_alg )
+ {
+ case MBEDTLS_PK_RSA:
+ if( set->rsa == MBEDTLS_MD_NONE )
+ set->rsa = md_alg;
+ break;
+
+ case MBEDTLS_PK_ECDSA:
+ if( set->ecdsa == MBEDTLS_MD_NONE )
+ set->ecdsa = md_alg;
+ break;
+
+ default:
+ break;
+ }
+}
+
+/* Allow exactly one hash algorithm for each signature. */
+void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set,
+ mbedtls_md_type_t md_alg )
+{
+ set->rsa = md_alg;
+ set->ecdsa = md_alg;
+}
+
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2) &&
+ MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
+
+/*
+ * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX
+ */
+mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash )
+{
+ switch( hash )
+ {
+#if defined(MBEDTLS_MD5_C)
+ case MBEDTLS_SSL_HASH_MD5:
+ return( MBEDTLS_MD_MD5 );
+#endif
+#if defined(MBEDTLS_SHA1_C)
+ case MBEDTLS_SSL_HASH_SHA1:
+ return( MBEDTLS_MD_SHA1 );
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ case MBEDTLS_SSL_HASH_SHA224:
+ return( MBEDTLS_MD_SHA224 );
+ case MBEDTLS_SSL_HASH_SHA256:
+ return( MBEDTLS_MD_SHA256 );
+#endif
+#if defined(MBEDTLS_SHA512_C)
+ case MBEDTLS_SSL_HASH_SHA384:
+ return( MBEDTLS_MD_SHA384 );
+ case MBEDTLS_SSL_HASH_SHA512:
+ return( MBEDTLS_MD_SHA512 );
+#endif
+ default:
+ return( MBEDTLS_MD_NONE );
+ }
+}
+
+/*
+ * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX
+ */
+unsigned char mbedtls_ssl_hash_from_md_alg( int md )
+{
+ switch( md )
+ {
+#if defined(MBEDTLS_MD5_C)
+ case MBEDTLS_MD_MD5:
+ return( MBEDTLS_SSL_HASH_MD5 );
+#endif
+#if defined(MBEDTLS_SHA1_C)
+ case MBEDTLS_MD_SHA1:
+ return( MBEDTLS_SSL_HASH_SHA1 );
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ case MBEDTLS_MD_SHA224:
+ return( MBEDTLS_SSL_HASH_SHA224 );
+ case MBEDTLS_MD_SHA256:
+ return( MBEDTLS_SSL_HASH_SHA256 );
+#endif
+#if defined(MBEDTLS_SHA512_C)
+ case MBEDTLS_MD_SHA384:
+ return( MBEDTLS_SSL_HASH_SHA384 );
+ case MBEDTLS_MD_SHA512:
+ return( MBEDTLS_SSL_HASH_SHA512 );
+#endif
+ default:
+ return( MBEDTLS_SSL_HASH_NONE );
+ }
+}
+
+#if defined(MBEDTLS_ECP_C)
+/*
+ * Check if a curve proposed by the peer is in our list.
+ * Return 0 if we're willing to use it, -1 otherwise.
+ */
+int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id )
+{
+ const mbedtls_ecp_group_id *gid;
+
+ if( ssl->conf->curve_list == NULL )
+ return( -1 );
+
+ for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
+ if( *gid == grp_id )
+ return( 0 );
+
+ return( -1 );
+}
+#endif /* MBEDTLS_ECP_C */
+
+#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
+/*
+ * Check if a hash proposed by the peer is in our list.
+ * Return 0 if we're willing to use it, -1 otherwise.
+ */
+int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl,
+ mbedtls_md_type_t md )
+{
+ const int *cur;
+
+ if( ssl->conf->sig_hashes == NULL )
+ return( -1 );
+
+ for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
+ if( *cur == (int) md )
+ return( 0 );
+
+ return( -1 );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
+ const mbedtls_ssl_ciphersuite_t *ciphersuite,
+ int cert_endpoint,
+ uint32_t *flags )
+{
+ int ret = 0;
+#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
+ int usage = 0;
+#endif
+#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
+ const char *ext_oid;
+ size_t ext_len;
+#endif
+
+#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \
+ !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
+ ((void) cert);
+ ((void) cert_endpoint);
+ ((void) flags);
+#endif
+
+#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
+ if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ /* Server part of the key exchange */
+ switch( ciphersuite->key_exchange )
+ {
+ case MBEDTLS_KEY_EXCHANGE_RSA:
+ case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
+ usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
+ break;
+
+ case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
+ case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
+ case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
+ usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
+ break;
+
+ case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
+ case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
+ usage = MBEDTLS_X509_KU_KEY_AGREEMENT;
+ break;
+
+ /* Don't use default: we want warnings when adding new values */
+ case MBEDTLS_KEY_EXCHANGE_NONE:
+ case MBEDTLS_KEY_EXCHANGE_PSK:
+ case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
+ case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
+ case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
+ usage = 0;
+ }
+ }
+ else
+ {
+ /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */
+ usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
+ }
+
+ if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 )
+ {
+ *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE;
+ ret = -1;
+ }
+#else
+ ((void) ciphersuite);
+#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
+
+#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
+ if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
+ {
+ ext_oid = MBEDTLS_OID_SERVER_AUTH;
+ ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH );
+ }
+ else
+ {
+ ext_oid = MBEDTLS_OID_CLIENT_AUTH;
+ ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH );
+ }
+
+ if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
+ {
+ *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE;
+ ret = -1;
+ }
+#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
+
+ return( ret );
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+/*
+ * Convert version numbers to/from wire format
+ * and, for DTLS, to/from TLS equivalent.
+ *
+ * For TLS this is the identity.
+ * For DTLS, use 1's complement (v -> 255 - v, and then map as follows:
+ * 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1)
+ * 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2)
+ */
+void mbedtls_ssl_write_version( int major, int minor, int transport,
+ unsigned char ver[2] )
+{
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ if( minor == MBEDTLS_SSL_MINOR_VERSION_2 )
+ --minor; /* DTLS 1.0 stored as TLS 1.1 internally */
+
+ ver[0] = (unsigned char)( 255 - ( major - 2 ) );
+ ver[1] = (unsigned char)( 255 - ( minor - 1 ) );
+ }
+ else
+#else
+ ((void) transport);
+#endif
+ {
+ ver[0] = (unsigned char) major;
+ ver[1] = (unsigned char) minor;
+ }
+}
+
+void mbedtls_ssl_read_version( int *major, int *minor, int transport,
+ const unsigned char ver[2] )
+{
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+ if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ *major = 255 - ver[0] + 2;
+ *minor = 255 - ver[1] + 1;
+
+ if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 )
+ ++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */
+ }
+ else
+#else
+ ((void) transport);
+#endif
+ {
+ *major = ver[0];
+ *minor = ver[1];
+ }
+}
+
+int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
+{
+#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
+ return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
+
+ switch( md )
+ {
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
+#if defined(MBEDTLS_MD5_C)
+ case MBEDTLS_SSL_HASH_MD5:
+ return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
+#endif
+#if defined(MBEDTLS_SHA1_C)
+ case MBEDTLS_SSL_HASH_SHA1:
+ ssl->handshake->calc_verify = ssl_calc_verify_tls;
+ break;
+#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
+#if defined(MBEDTLS_SHA512_C)
+ case MBEDTLS_SSL_HASH_SHA384:
+ ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384;
+ break;
+#endif
+#if defined(MBEDTLS_SHA256_C)
+ case MBEDTLS_SSL_HASH_SHA256:
+ ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256;
+ break;
+#endif
+ default:
+ return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
+ }
+
+ return 0;
+#else /* !MBEDTLS_SSL_PROTO_TLS1_2 */
+ (void) ssl;
+ (void) md;
+
+ return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
+#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
+}
+
+#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_1)
+int mbedtls_ssl_get_key_exchange_md_ssl_tls( mbedtls_ssl_context *ssl,
+ unsigned char *output,
+ unsigned char *data, size_t data_len )
+{
+ int ret = 0;
+ mbedtls_md5_context mbedtls_md5;
+ mbedtls_sha1_context mbedtls_sha1;
+
+ mbedtls_md5_init( &mbedtls_md5 );
+ mbedtls_sha1_init( &mbedtls_sha1 );
+
+ /*
+ * digitally-signed struct {
+ * opaque md5_hash[16];
+ * opaque sha_hash[20];
+ * };
+ *
+ * md5_hash
+ * MD5(ClientHello.random + ServerHello.random
+ * + ServerParams);
+ * sha_hash
+ * SHA(ClientHello.random + ServerHello.random
+ * + ServerParams);
+ */
+ if( ( ret = mbedtls_md5_starts_ret( &mbedtls_md5 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_starts_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5,
+ ssl->handshake->randbytes, 64 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, data, data_len ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md5_finish_ret( &mbedtls_md5, output ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_finish_ret", ret );
+ goto exit;
+ }
+
+ if( ( ret = mbedtls_sha1_starts_ret( &mbedtls_sha1 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_starts_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1,
+ ssl->handshake->randbytes, 64 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, data,
+ data_len ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_sha1_finish_ret( &mbedtls_sha1,
+ output + 16 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_finish_ret", ret );
+ goto exit;
+ }
+
+exit:
+ mbedtls_md5_free( &mbedtls_md5 );
+ mbedtls_sha1_free( &mbedtls_sha1 );
+
+ if( ret != 0 )
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+
+ return( ret );
+
+}
+#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
+ MBEDTLS_SSL_PROTO_TLS1_1 */
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
+ defined(MBEDTLS_SSL_PROTO_TLS1_2)
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl,
+ unsigned char *hash, size_t *hashlen,
+ unsigned char *data, size_t data_len,
+ mbedtls_md_type_t md_alg )
+{
+ psa_status_t status;
+ psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT;
+ psa_algorithm_t hash_alg = mbedtls_psa_translate_md( md_alg );
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Perform PSA-based computation of digest of ServerKeyExchange" ) );
+
+ if( ( status = psa_hash_setup( &hash_operation,
+ hash_alg ) ) != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_setup", status );
+ goto exit;
+ }
+
+ if( ( status = psa_hash_update( &hash_operation, ssl->handshake->randbytes,
+ 64 ) ) != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_update", status );
+ goto exit;
+ }
+
+ if( ( status = psa_hash_update( &hash_operation,
+ data, data_len ) ) != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_update", status );
+ goto exit;
+ }
+
+ if( ( status = psa_hash_finish( &hash_operation, hash, MBEDTLS_MD_MAX_SIZE,
+ hashlen ) ) != PSA_SUCCESS )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_finish", status );
+ goto exit;
+ }
+
+exit:
+ if( status != PSA_SUCCESS )
+ {
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+ switch( status )
+ {
+ case PSA_ERROR_NOT_SUPPORTED:
+ return( MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE );
+ case PSA_ERROR_BAD_STATE: /* Intentional fallthrough */
+ case PSA_ERROR_BUFFER_TOO_SMALL:
+ return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
+ case PSA_ERROR_INSUFFICIENT_MEMORY:
+ return( MBEDTLS_ERR_MD_ALLOC_FAILED );
+ default:
+ return( MBEDTLS_ERR_MD_HW_ACCEL_FAILED );
+ }
+ }
+ return( 0 );
+}
+
+#else
+
+int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl,
+ unsigned char *hash, size_t *hashlen,
+ unsigned char *data, size_t data_len,
+ mbedtls_md_type_t md_alg )
+{
+ int ret = 0;
+ mbedtls_md_context_t ctx;
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg );
+ *hashlen = mbedtls_md_get_size( md_info );
+
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "Perform mbedtls-based computation of digest of ServerKeyExchange" ) );
+
+ mbedtls_md_init( &ctx );
+
+ /*
+ * digitally-signed struct {
+ * opaque client_random[32];
+ * opaque server_random[32];
+ * ServerDHParams params;
+ * };
+ */
+ if( ( ret = mbedtls_md_setup( &ctx, md_info, 0 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md_starts( &ctx ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_starts", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md_update( &ctx, data, data_len ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret );
+ goto exit;
+ }
+ if( ( ret = mbedtls_md_finish( &ctx, hash ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_finish", ret );
+ goto exit;
+ }
+
+exit:
+ mbedtls_md_free( &ctx );
+
+ if( ret != 0 )
+ mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+ MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+
+ return( ret );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
+ MBEDTLS_SSL_PROTO_TLS1_2 */
+
+#endif /* MBEDTLS_SSL_TLS_C */