| /* |
| * X.509 common functions for parsing and verification |
| * |
| * 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 ITU-T X.509 standard defines a certificate format for PKI. |
| * |
| * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs) |
| * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs) |
| * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10) |
| * |
| * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf |
| * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf |
| */ |
| |
| #if !defined(MBEDTLS_CONFIG_FILE) |
| #include "mbedtls/config.h" |
| #else |
| #include MBEDTLS_CONFIG_FILE |
| #endif |
| |
| #if defined(MBEDTLS_X509_USE_C) |
| |
| #include "mbedtls/x509.h" |
| #include "mbedtls/x509_internal.h" |
| #include "mbedtls/asn1.h" |
| #include "mbedtls/oid.h" |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #if defined(MBEDTLS_PEM_PARSE_C) |
| #include "mbedtls/pem.h" |
| #endif |
| |
| #if defined(MBEDTLS_PLATFORM_C) |
| #include "mbedtls/platform.h" |
| #else |
| #include <stdio.h> |
| #include <stdlib.h> |
| #define mbedtls_free free |
| #define mbedtls_calloc calloc |
| #define mbedtls_printf printf |
| #define mbedtls_snprintf snprintf |
| #endif |
| |
| #if defined(MBEDTLS_HAVE_TIME) |
| #include "mbedtls/platform_time.h" |
| #endif |
| #if defined(MBEDTLS_HAVE_TIME_DATE) |
| #include "mbedtls/platform_util.h" |
| #include <time.h> |
| #endif |
| |
| #define CHECK(code) if( ( ret = ( code ) ) != 0 ){ return( ret ); } |
| #define CHECK_RANGE(min, max, val) \ |
| do \ |
| { \ |
| if( ( val ) < ( min ) || ( val ) > ( max ) ) \ |
| { \ |
| return( ret ); \ |
| } \ |
| } while( 0 ) |
| |
| /* |
| * CertificateSerialNumber ::= INTEGER |
| */ |
| int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end, |
| mbedtls_x509_buf *serial ) |
| { |
| int ret; |
| |
| if( ( end - *p ) < 1 ) |
| return( MBEDTLS_ERR_X509_INVALID_SERIAL + |
| MBEDTLS_ERR_ASN1_OUT_OF_DATA ); |
| |
| if( **p != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_PRIMITIVE | 2 ) && |
| **p != MBEDTLS_ASN1_INTEGER ) |
| return( MBEDTLS_ERR_X509_INVALID_SERIAL + |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); |
| |
| serial->tag = *(*p)++; |
| |
| if( ( ret = mbedtls_asn1_get_len( p, end, &serial->len ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_SERIAL + ret ); |
| |
| serial->p = *p; |
| *p += serial->len; |
| |
| return( 0 ); |
| } |
| |
| /* Get an algorithm identifier without parameters (eg for signatures) |
| * |
| * AlgorithmIdentifier ::= SEQUENCE { |
| * algorithm OBJECT IDENTIFIER, |
| * parameters ANY DEFINED BY algorithm OPTIONAL } |
| */ |
| int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end, |
| mbedtls_x509_buf *alg ) |
| { |
| int ret; |
| |
| if( ( ret = mbedtls_asn1_get_alg_null( p, end, alg ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Parse an algorithm identifier with (optional) parameters |
| */ |
| int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end, |
| mbedtls_x509_buf *alg, mbedtls_x509_buf *params ) |
| { |
| int ret; |
| |
| if( ( ret = mbedtls_asn1_get_alg( p, end, alg, params ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) |
| /* |
| * HashAlgorithm ::= AlgorithmIdentifier |
| * |
| * AlgorithmIdentifier ::= SEQUENCE { |
| * algorithm OBJECT IDENTIFIER, |
| * parameters ANY DEFINED BY algorithm OPTIONAL } |
| * |
| * For HashAlgorithm, parameters MUST be NULL or absent. |
| */ |
| static int x509_get_hash_alg( const mbedtls_x509_buf *alg, mbedtls_md_type_t *md_alg ) |
| { |
| int ret; |
| unsigned char *p; |
| const unsigned char *end; |
| mbedtls_x509_buf md_oid; |
| size_t len; |
| |
| /* Make sure we got a SEQUENCE and setup bounds */ |
| if( alg->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); |
| |
| p = (unsigned char *) alg->p; |
| end = p + alg->len; |
| |
| if( p >= end ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_OUT_OF_DATA ); |
| |
| /* Parse md_oid */ |
| md_oid.tag = *p; |
| |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &md_oid.len, MBEDTLS_ASN1_OID ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| md_oid.p = p; |
| p += md_oid.len; |
| |
| /* Get md_alg from md_oid */ |
| if( ( ret = mbedtls_oid_get_md_alg( &md_oid, md_alg ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| /* Make sure params is absent of NULL */ |
| if( p == end ) |
| return( 0 ); |
| |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_NULL ) ) != 0 || len != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| if( p != end ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * RSASSA-PSS-params ::= SEQUENCE { |
| * hashAlgorithm [0] HashAlgorithm DEFAULT sha1Identifier, |
| * maskGenAlgorithm [1] MaskGenAlgorithm DEFAULT mgf1SHA1Identifier, |
| * saltLength [2] INTEGER DEFAULT 20, |
| * trailerField [3] INTEGER DEFAULT 1 } |
| * -- Note that the tags in this Sequence are explicit. |
| * |
| * RFC 4055 (which defines use of RSASSA-PSS in PKIX) states that the value |
| * of trailerField MUST be 1, and PKCS#1 v2.2 doesn't even define any other |
| * option. Enfore this at parsing time. |
| */ |
| int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params, |
| mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md, |
| int *salt_len ) |
| { |
| int ret; |
| unsigned char *p; |
| const unsigned char *end, *end2; |
| size_t len; |
| mbedtls_x509_buf alg_id, alg_params; |
| |
| /* First set everything to defaults */ |
| *md_alg = MBEDTLS_MD_SHA1; |
| *mgf_md = MBEDTLS_MD_SHA1; |
| *salt_len = 20; |
| |
| /* Make sure params is a SEQUENCE and setup bounds */ |
| if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); |
| |
| p = (unsigned char *) params->p; |
| end = p + params->len; |
| |
| if( p == end ) |
| return( 0 ); |
| |
| /* |
| * HashAlgorithm |
| */ |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 ) |
| { |
| end2 = p + len; |
| |
| /* HashAlgorithm ::= AlgorithmIdentifier (without parameters) */ |
| if( ( ret = mbedtls_x509_get_alg_null( &p, end2, &alg_id ) ) != 0 ) |
| return( ret ); |
| |
| if( ( ret = mbedtls_oid_get_md_alg( &alg_id, md_alg ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| if( p != end2 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| if( p == end ) |
| return( 0 ); |
| |
| /* |
| * MaskGenAlgorithm |
| */ |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 ) |
| { |
| end2 = p + len; |
| |
| /* MaskGenAlgorithm ::= AlgorithmIdentifier (params = HashAlgorithm) */ |
| if( ( ret = mbedtls_x509_get_alg( &p, end2, &alg_id, &alg_params ) ) != 0 ) |
| return( ret ); |
| |
| /* Only MFG1 is recognised for now */ |
| if( MBEDTLS_OID_CMP( MBEDTLS_OID_MGF1, &alg_id ) != 0 ) |
| return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE + |
| MBEDTLS_ERR_OID_NOT_FOUND ); |
| |
| /* Parse HashAlgorithm */ |
| if( ( ret = x509_get_hash_alg( &alg_params, mgf_md ) ) != 0 ) |
| return( ret ); |
| |
| if( p != end2 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| if( p == end ) |
| return( 0 ); |
| |
| /* |
| * salt_len |
| */ |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 2 ) ) == 0 ) |
| { |
| end2 = p + len; |
| |
| if( ( ret = mbedtls_asn1_get_int( &p, end2, salt_len ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| if( p != end2 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| if( p == end ) |
| return( 0 ); |
| |
| /* |
| * trailer_field (if present, must be 1) |
| */ |
| if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 3 ) ) == 0 ) |
| { |
| int trailer_field; |
| |
| end2 = p + len; |
| |
| if( ( ret = mbedtls_asn1_get_int( &p, end2, &trailer_field ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| if( p != end2 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| if( trailer_field != 1 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG ); |
| } |
| else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| if( p != end ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */ |
| |
| /* |
| * AttributeTypeAndValue ::= SEQUENCE { |
| * type AttributeType, |
| * value AttributeValue } |
| * |
| * AttributeType ::= OBJECT IDENTIFIER |
| * |
| * AttributeValue ::= ANY DEFINED BY AttributeType |
| * |
| * NOTE: This function returns an ASN.1 low-level error code. |
| */ |
| static int x509_get_attr_type_value( unsigned char **p, |
| const unsigned char *end, |
| mbedtls_x509_buf *oid, |
| mbedtls_x509_buf *val ) |
| { |
| int ret; |
| size_t len; |
| |
| ret = mbedtls_asn1_get_tag( p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE ); |
| if( ret != 0 ) |
| goto exit; |
| |
| end = *p + len; |
| |
| ret = mbedtls_asn1_get_tag( p, end, &oid->len, MBEDTLS_ASN1_OID ); |
| if( ret != 0 ) |
| goto exit; |
| |
| oid->tag = MBEDTLS_ASN1_OID; |
| oid->p = *p; |
| *p += oid->len; |
| |
| if( *p == end ) |
| { |
| ret = MBEDTLS_ERR_ASN1_OUT_OF_DATA; |
| goto exit; |
| } |
| |
| if( !MBEDTLS_ASN1_IS_STRING_TAG( **p ) ) |
| { |
| ret = MBEDTLS_ERR_ASN1_UNEXPECTED_TAG; |
| goto exit; |
| } |
| |
| val->tag = *(*p)++; |
| |
| ret = mbedtls_asn1_get_len( p, end, &val->len ); |
| if( ret != 0 ) |
| goto exit; |
| |
| val->p = *p; |
| *p += val->len; |
| |
| if( *p != end ) |
| ret = MBEDTLS_ERR_ASN1_LENGTH_MISMATCH; |
| |
| exit: |
| return( ret ); |
| } |
| |
| /* |
| * Name ::= CHOICE { -- only one possibility for now -- |
| * rdnSequence RDNSequence } |
| * |
| * RDNSequence ::= SEQUENCE OF RelativeDistinguishedName |
| * |
| * RelativeDistinguishedName ::= |
| * SET OF AttributeTypeAndValue |
| * |
| * AttributeTypeAndValue ::= SEQUENCE { |
| * type AttributeType, |
| * value AttributeValue } |
| * |
| * AttributeType ::= OBJECT IDENTIFIER |
| * |
| * AttributeValue ::= ANY DEFINED BY AttributeType |
| * |
| * The data structure is optimized for the common case where each RDN has only |
| * one element, which is represented as a list of AttributeTypeAndValue. |
| * For the general case we still use a flat list, but we mark elements of the |
| * same set so that they are "merged" together in the functions that consume |
| * this list, eg mbedtls_x509_dn_gets(). |
| * |
| * NOTE: This function returns an ASN.1 low-level error code. |
| */ |
| static int x509_set_sequence_iterate( unsigned char **p, |
| unsigned char const **end_set, |
| unsigned char const *end, |
| mbedtls_x509_buf *oid, |
| mbedtls_x509_buf *val ) |
| { |
| int ret; |
| size_t set_len; |
| |
| if( *p == *end_set ) |
| { |
| /* Parse next TLV of ASN.1 SET structure. */ |
| ret = mbedtls_asn1_get_tag( p, end, &set_len, |
| MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SET ); |
| if( ret != 0 ) |
| goto exit; |
| |
| *end_set = *p + set_len; |
| } |
| |
| /* x509_get_attr_type_value() returns ASN.1 low-level error codes. */ |
| ret = x509_get_attr_type_value( p, *end_set, oid, val ); |
| |
| exit: |
| return( ret ); |
| } |
| |
| /* |
| * Like memcmp, but case-insensitive and always returns -1 if different |
| */ |
| int mbedtls_x509_memcasecmp( const void *s1, const void *s2, |
| size_t len1, size_t len2 ) |
| { |
| size_t i; |
| unsigned char diff; |
| const unsigned char *n1 = s1, *n2 = s2; |
| |
| if( len1 != len2 ) |
| return( -1 ); |
| |
| for( i = 0; i < len1; i++ ) |
| { |
| diff = n1[i] ^ n2[i]; |
| |
| if( diff == 0 ) |
| continue; |
| |
| if( diff == 32 && |
| ( ( n1[i] >= 'a' && n1[i] <= 'z' ) || |
| ( n1[i] >= 'A' && n1[i] <= 'Z' ) ) ) |
| { |
| continue; |
| } |
| |
| return( -1 ); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Compare two X.509 strings, case-insensitive, and allowing for some encoding |
| * variations (but not all). |
| * |
| * Return 0 if equal, -1 otherwise. |
| */ |
| static int x509_string_cmp( const mbedtls_x509_buf *a, |
| const mbedtls_x509_buf *b ) |
| { |
| if( a->tag == b->tag && |
| a->len == b->len && |
| memcmp( a->p, b->p, b->len ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) && |
| ( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) && |
| mbedtls_x509_memcasecmp( a->p, b->p, |
| a->len, b->len ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| return( -1 ); |
| } |
| |
| /* |
| * Compare two X.509 Names (aka rdnSequence) given as raw ASN.1 data. |
| * |
| * See RFC 5280 section 7.1, though we don't implement the whole algorithm: |
| * We sometimes return unequal when the full algorithm would return equal, |
| * but never the other way. (In particular, we don't do Unicode normalisation |
| * or space folding.) |
| * |
| * Further, this function allows to pass a callback to be triggered for every |
| * pair of well-formed and equal entries in the two input name lists. |
| * |
| * Returns: |
| * - 0 if both sequences are well-formed, present the same X.509 name, |
| * and the callback (if provided) hasn't returned a non-zero value |
| * on any of the name components. |
| * - 1 if a difference was detected in the name components. |
| * - A non-zero error code if the abort callback returns a non-zero value. |
| * In this case, the returned error code is the error code from the callback. |
| * - A negative error code if a parsing error occurred in either |
| * of the two buffers. |
| * |
| * This function can be used to verify that a buffer contains a well-formed |
| * ASN.1 encoded X.509 name by calling it with equal parameters. |
| */ |
| int mbedtls_x509_name_cmp_raw( mbedtls_x509_buf_raw const *a, |
| mbedtls_x509_buf_raw const *b, |
| int (*abort_check)( void *ctx, |
| mbedtls_x509_buf *oid, |
| mbedtls_x509_buf *val, |
| int next_merged ), |
| void *abort_check_ctx ) |
| { |
| int ret; |
| size_t idx; |
| unsigned char *p[2], *end[2], *set[2]; |
| |
| p[0] = a->p; |
| p[1] = b->p; |
| end[0] = p[0] + a->len; |
| end[1] = p[1] + b->len; |
| |
| for( idx = 0; idx < 2; idx++ ) |
| { |
| size_t len; |
| ret = mbedtls_asn1_get_tag( &p[idx], end[idx], &len, |
| MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE ); |
| |
| if( end[idx] != p[idx] + len ) |
| { |
| return( MBEDTLS_ERR_X509_INVALID_NAME + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| |
| set[idx] = p[idx]; |
| } |
| |
| while( 1 ) |
| { |
| int next_merged; |
| mbedtls_x509_buf oid[2], val[2]; |
| |
| ret = x509_set_sequence_iterate( &p[0], (const unsigned char **) &set[0], |
| end[0], &oid[0], &val[0] ); |
| if( ret != 0 ) |
| goto exit; |
| |
| ret = x509_set_sequence_iterate( &p[1], (const unsigned char **) &set[1], |
| end[1], &oid[1], &val[1] ); |
| if( ret != 0 ) |
| goto exit; |
| |
| if( oid[0].len != oid[1].len || |
| memcmp( oid[0].p, oid[1].p, oid[1].len ) != 0 ) |
| { |
| return( 1 ); |
| } |
| |
| if( x509_string_cmp( &val[0], &val[1] ) != 0 ) |
| return( 1 ); |
| |
| next_merged = ( set[0] != p[0] ); |
| if( next_merged != ( set[1] != p[1] ) ) |
| return( 1 ); |
| |
| if( abort_check != NULL ) |
| { |
| ret = abort_check( abort_check_ctx, &oid[0], &val[0], |
| next_merged ); |
| if( ret != 0 ) |
| return( ret ); |
| } |
| |
| if( p[0] == end[0] && p[1] == end[1] ) |
| break; |
| } |
| |
| exit: |
| if( ret < 0 ) |
| ret += MBEDTLS_ERR_X509_INVALID_NAME; |
| |
| return( ret ); |
| } |
| |
| static int x509_get_name_cb( void *ctx, |
| mbedtls_x509_buf *oid, |
| mbedtls_x509_buf *val, |
| int next_merged ) |
| { |
| mbedtls_x509_name **cur_ptr = (mbedtls_x509_name**) ctx; |
| mbedtls_x509_name *cur = *cur_ptr; |
| |
| if( cur->oid.p != NULL ) |
| { |
| cur->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_name ) ); |
| if( cur->next == NULL ) |
| return( MBEDTLS_ERR_ASN1_ALLOC_FAILED ); |
| |
| cur = cur->next; |
| } |
| |
| cur->oid = *oid; |
| cur->val = *val; |
| cur->next_merged = next_merged; |
| |
| *cur_ptr = cur; |
| return( 0 ); |
| } |
| |
| int mbedtls_x509_get_name( unsigned char *p, |
| size_t len, |
| mbedtls_x509_name *cur ) |
| { |
| mbedtls_x509_buf_raw name_buf = { p, len }; |
| memset( cur, 0, sizeof( mbedtls_x509_name ) ); |
| return( mbedtls_x509_name_cmp_raw( &name_buf, &name_buf, |
| x509_get_name_cb, |
| &cur ) ); |
| } |
| |
| static int x509_parse_int( unsigned char **p, size_t n, int *res ) |
| { |
| *res = 0; |
| |
| for( ; n > 0; --n ) |
| { |
| if( ( **p < '0') || ( **p > '9' ) ) |
| return ( MBEDTLS_ERR_X509_INVALID_DATE ); |
| |
| *res *= 10; |
| *res += ( *(*p)++ - '0' ); |
| } |
| |
| return( 0 ); |
| } |
| |
| static int x509_date_is_valid(const mbedtls_x509_time *t ) |
| { |
| int ret = MBEDTLS_ERR_X509_INVALID_DATE; |
| int month_len; |
| |
| CHECK_RANGE( 0, 9999, t->year ); |
| CHECK_RANGE( 0, 23, t->hour ); |
| CHECK_RANGE( 0, 59, t->min ); |
| CHECK_RANGE( 0, 59, t->sec ); |
| |
| switch( t->mon ) |
| { |
| case 1: case 3: case 5: case 7: case 8: case 10: case 12: |
| month_len = 31; |
| break; |
| case 4: case 6: case 9: case 11: |
| month_len = 30; |
| break; |
| case 2: |
| if( ( !( t->year % 4 ) && t->year % 100 ) || |
| !( t->year % 400 ) ) |
| month_len = 29; |
| else |
| month_len = 28; |
| break; |
| default: |
| return( ret ); |
| } |
| CHECK_RANGE( 1, month_len, t->day ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Parse an ASN1_UTC_TIME (yearlen=2) or ASN1_GENERALIZED_TIME (yearlen=4) |
| * field. |
| */ |
| static int x509_parse_time( unsigned char **p, size_t len, size_t yearlen, |
| mbedtls_x509_time *tm ) |
| { |
| int ret; |
| |
| /* |
| * Minimum length is 10 or 12 depending on yearlen |
| */ |
| if ( len < yearlen + 8 ) |
| return ( MBEDTLS_ERR_X509_INVALID_DATE ); |
| len -= yearlen + 8; |
| |
| /* |
| * Parse year, month, day, hour, minute |
| */ |
| CHECK( x509_parse_int( p, yearlen, &tm->year ) ); |
| if ( 2 == yearlen ) |
| { |
| if ( tm->year < 50 ) |
| tm->year += 100; |
| |
| tm->year += 1900; |
| } |
| |
| CHECK( x509_parse_int( p, 2, &tm->mon ) ); |
| CHECK( x509_parse_int( p, 2, &tm->day ) ); |
| CHECK( x509_parse_int( p, 2, &tm->hour ) ); |
| CHECK( x509_parse_int( p, 2, &tm->min ) ); |
| |
| /* |
| * Parse seconds if present |
| */ |
| if ( len >= 2 ) |
| { |
| CHECK( x509_parse_int( p, 2, &tm->sec ) ); |
| len -= 2; |
| } |
| else |
| return ( MBEDTLS_ERR_X509_INVALID_DATE ); |
| |
| /* |
| * Parse trailing 'Z' if present |
| */ |
| if ( 1 == len && 'Z' == **p ) |
| { |
| (*p)++; |
| len--; |
| } |
| |
| /* |
| * We should have parsed all characters at this point |
| */ |
| if ( 0 != len ) |
| return ( MBEDTLS_ERR_X509_INVALID_DATE ); |
| |
| CHECK( x509_date_is_valid( tm ) ); |
| |
| return ( 0 ); |
| } |
| |
| /* |
| * Time ::= CHOICE { |
| * utcTime UTCTime, |
| * generalTime GeneralizedTime } |
| */ |
| int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end, |
| mbedtls_x509_time *tm ) |
| { |
| int ret; |
| size_t len, year_len; |
| unsigned char tag; |
| |
| if( ( end - *p ) < 1 ) |
| return( MBEDTLS_ERR_X509_INVALID_DATE + |
| MBEDTLS_ERR_ASN1_OUT_OF_DATA ); |
| |
| tag = **p; |
| |
| if( tag == MBEDTLS_ASN1_UTC_TIME ) |
| year_len = 2; |
| else if( tag == MBEDTLS_ASN1_GENERALIZED_TIME ) |
| year_len = 4; |
| else |
| return( MBEDTLS_ERR_X509_INVALID_DATE + |
| MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); |
| |
| (*p)++; |
| ret = mbedtls_asn1_get_len( p, end, &len ); |
| |
| if( ret != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_DATE + ret ); |
| |
| return x509_parse_time( p, len, year_len, tm ); |
| } |
| |
| int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig ) |
| { |
| int ret; |
| size_t len; |
| int tag_type; |
| |
| if( ( end - *p ) < 1 ) |
| return( MBEDTLS_ERR_X509_INVALID_SIGNATURE + |
| MBEDTLS_ERR_ASN1_OUT_OF_DATA ); |
| |
| tag_type = **p; |
| |
| if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_SIGNATURE + ret ); |
| |
| sig->tag = tag_type; |
| sig->len = len; |
| sig->p = *p; |
| |
| *p += len; |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_x509_get_sig_alg_raw( unsigned char **p, unsigned char const *end, |
| mbedtls_md_type_t *md_alg, |
| mbedtls_pk_type_t *pk_alg, |
| void **sig_opts ) |
| { |
| int ret; |
| mbedtls_asn1_buf alg, params; |
| ret = mbedtls_asn1_get_alg( p, end, &alg, ¶ms ); |
| if( ret != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG + ret ); |
| |
| return( mbedtls_x509_get_sig_alg( &alg, ¶ms, md_alg, |
| pk_alg, sig_opts ) ); |
| } |
| |
| /* |
| * Get signature algorithm from alg OID and optional parameters |
| */ |
| int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params, |
| mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg, |
| void **sig_opts ) |
| { |
| int ret; |
| |
| if( ( ret = mbedtls_oid_get_sig_alg( sig_oid, md_alg, pk_alg ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + ret ); |
| |
| #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) |
| if( *pk_alg == MBEDTLS_PK_RSASSA_PSS ) |
| { |
| mbedtls_pk_rsassa_pss_options *pss_opts; |
| |
| pss_opts = mbedtls_calloc( 1, sizeof( mbedtls_pk_rsassa_pss_options ) ); |
| if( pss_opts == NULL ) |
| return( MBEDTLS_ERR_X509_ALLOC_FAILED ); |
| |
| ret = mbedtls_x509_get_rsassa_pss_params( sig_params, |
| md_alg, |
| &pss_opts->mgf1_hash_id, |
| &pss_opts->expected_salt_len ); |
| if( ret != 0 ) |
| { |
| mbedtls_free( pss_opts ); |
| return( ret ); |
| } |
| |
| if( sig_opts != NULL ) |
| *sig_opts = (void *) pss_opts; |
| else |
| mbedtls_free( pss_opts ); |
| } |
| else |
| #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */ |
| { |
| /* Make sure parameters are absent or NULL */ |
| if( ( sig_params->tag != MBEDTLS_ASN1_NULL && sig_params->tag != 0 ) || |
| sig_params->len != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_ALG ); |
| |
| if( sig_opts != NULL ) |
| *sig_opts = NULL; |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * X.509 Extensions (No parsing of extensions, pointer should |
| * be either manually updated or extensions should be parsed!) |
| */ |
| int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end, |
| mbedtls_x509_buf *ext, int tag ) |
| { |
| int ret; |
| size_t len; |
| |
| /* Extension structure use EXPLICIT tagging. That is, the actual |
| * `Extensions` structure is wrapped by a tag-length pair using |
| * the respective context-specific tag. */ |
| ret = mbedtls_asn1_get_tag( p, end, &ext->len, |
| MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag ); |
| if( ret != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| ext->tag = MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag; |
| ext->p = *p; |
| end = *p + ext->len; |
| |
| /* |
| * Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension |
| */ |
| if( ( ret = mbedtls_asn1_get_tag( p, end, &len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( end != *p + len ) |
| return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Store the name in printable form into buf; no more |
| * than size characters will be written |
| */ |
| int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn ) |
| { |
| int ret; |
| size_t i, n; |
| unsigned char c, merge = 0; |
| const mbedtls_x509_name *name; |
| const char *short_name = NULL; |
| char s[MBEDTLS_X509_MAX_DN_NAME_SIZE], *p; |
| |
| memset( s, 0, sizeof( s ) ); |
| |
| name = dn; |
| p = buf; |
| n = size; |
| |
| while( name != NULL ) |
| { |
| if( !name->oid.p ) |
| { |
| name = name->next; |
| continue; |
| } |
| |
| if( name != dn ) |
| { |
| ret = mbedtls_snprintf( p, n, merge ? " + " : ", " ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| } |
| |
| ret = mbedtls_oid_get_attr_short_name( &name->oid, &short_name ); |
| |
| if( ret == 0 ) |
| ret = mbedtls_snprintf( p, n, "%s=", short_name ); |
| else |
| ret = mbedtls_snprintf( p, n, "\?\?=" ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| for( i = 0; i < name->val.len; i++ ) |
| { |
| if( i >= sizeof( s ) - 1 ) |
| break; |
| |
| c = name->val.p[i]; |
| if( c < 32 || c == 127 || ( c > 128 && c < 160 ) ) |
| s[i] = '?'; |
| else s[i] = c; |
| } |
| s[i] = '\0'; |
| ret = mbedtls_snprintf( p, n, "%s", s ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| merge = name->next_merged; |
| name = name->next; |
| } |
| |
| return( (int) ( size - n ) ); |
| } |
| |
| /* |
| * Store the serial in printable form into buf; no more |
| * than size characters will be written |
| */ |
| int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial ) |
| { |
| int ret; |
| size_t i, n, nr; |
| char *p; |
| |
| p = buf; |
| n = size; |
| |
| nr = ( serial->len <= 32 ) |
| ? serial->len : 28; |
| |
| for( i = 0; i < nr; i++ ) |
| { |
| if( i == 0 && nr > 1 && serial->p[i] == 0x0 ) |
| continue; |
| |
| ret = mbedtls_snprintf( p, n, "%02X%s", |
| serial->p[i], ( i < nr - 1 ) ? ":" : "" ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| } |
| |
| if( nr != serial->len ) |
| { |
| ret = mbedtls_snprintf( p, n, "...." ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| } |
| |
| return( (int) ( size - n ) ); |
| } |
| |
| #if !defined(MBEDTLS_X509_REMOVE_INFO) |
| /* |
| * Helper for writing signature algorithms |
| */ |
| int mbedtls_x509_sig_alg_gets( char *buf, size_t size, mbedtls_pk_type_t pk_alg, |
| mbedtls_md_type_t md_alg, const void *sig_opts ) |
| { |
| int ret; |
| char *p = buf; |
| size_t n = size; |
| const char *desc = NULL; |
| mbedtls_x509_buf sig_oid; |
| mbedtls_md_type_t tmp_md_alg = md_alg; |
| |
| #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) |
| /* The hash for RSASSA is determined by the algorithm parameters; |
| * in the OID list, the hash is set to MBEDTLS_MD_NONE. */ |
| if( pk_alg == MBEDTLS_PK_RSASSA_PSS ) |
| tmp_md_alg = MBEDTLS_MD_NONE; |
| #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */ |
| |
| sig_oid.tag = MBEDTLS_ASN1_OID; |
| ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, tmp_md_alg, |
| (const char**) &sig_oid.p, |
| &sig_oid.len ); |
| if( ret == 0 && |
| mbedtls_oid_get_sig_alg_desc( &sig_oid, &desc ) == 0 ) |
| { |
| ret = mbedtls_snprintf( p, n, "%s", desc ); |
| } |
| else |
| ret = mbedtls_snprintf( p, n, "???" ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) |
| if( pk_alg == MBEDTLS_PK_RSASSA_PSS ) |
| { |
| const mbedtls_pk_rsassa_pss_options *pss_opts; |
| const mbedtls_md_info_t *md_info, *mgf_md_info; |
| |
| pss_opts = (const mbedtls_pk_rsassa_pss_options *) sig_opts; |
| |
| md_info = mbedtls_md_info_from_type( md_alg ); |
| mgf_md_info = mbedtls_md_info_from_type( pss_opts->mgf1_hash_id ); |
| |
| ret = mbedtls_snprintf( p, n, " (%s, MGF1-%s, 0x%02X)", |
| md_info ? mbedtls_md_get_name( md_info ) : "???", |
| mgf_md_info ? mbedtls_md_get_name( mgf_md_info ) : "???", |
| pss_opts->expected_salt_len ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| } |
| #else |
| ((void) pk_alg); |
| ((void) md_alg); |
| ((void) sig_opts); |
| #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */ |
| |
| return( (int)( size - n ) ); |
| } |
| #endif /* !MBEDTLS_X509_REMOVE_INFO */ |
| |
| /* |
| * Helper for writing "RSA key size", "EC key size", etc |
| */ |
| int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name ) |
| { |
| char *p = buf; |
| size_t n = buf_size; |
| int ret; |
| |
| ret = mbedtls_snprintf( p, n, "%s key size", name ); |
| MBEDTLS_X509_SAFE_SNPRINTF; |
| |
| return( 0 ); |
| } |
| |
| #if defined(MBEDTLS_HAVE_TIME_DATE) |
| /* |
| * Set the time structure to the current time. |
| * Return 0 on success, non-zero on failure. |
| */ |
| static int x509_get_current_time( mbedtls_x509_time *now ) |
| { |
| struct tm *lt, tm_buf; |
| mbedtls_time_t tt; |
| int ret = 0; |
| |
| tt = mbedtls_time( NULL ); |
| lt = mbedtls_platform_gmtime_r( &tt, &tm_buf ); |
| |
| if( lt == NULL ) |
| ret = -1; |
| else |
| { |
| now->year = lt->tm_year + 1900; |
| now->mon = lt->tm_mon + 1; |
| now->day = lt->tm_mday; |
| now->hour = lt->tm_hour; |
| now->min = lt->tm_min; |
| now->sec = lt->tm_sec; |
| } |
| |
| return( ret ); |
| } |
| |
| /* |
| * Return 0 if before <= after, 1 otherwise |
| */ |
| static int x509_check_time( const mbedtls_x509_time *before, const mbedtls_x509_time *after ) |
| { |
| if( before->year > after->year ) |
| return( 1 ); |
| |
| if( before->year == after->year && |
| before->mon > after->mon ) |
| return( 1 ); |
| |
| if( before->year == after->year && |
| before->mon == after->mon && |
| before->day > after->day ) |
| return( 1 ); |
| |
| if( before->year == after->year && |
| before->mon == after->mon && |
| before->day == after->day && |
| before->hour > after->hour ) |
| return( 1 ); |
| |
| if( before->year == after->year && |
| before->mon == after->mon && |
| before->day == after->day && |
| before->hour == after->hour && |
| before->min > after->min ) |
| return( 1 ); |
| |
| if( before->year == after->year && |
| before->mon == after->mon && |
| before->day == after->day && |
| before->hour == after->hour && |
| before->min == after->min && |
| before->sec > after->sec ) |
| return( 1 ); |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_x509_time_is_past( const mbedtls_x509_time *to ) |
| { |
| mbedtls_x509_time now; |
| |
| if( x509_get_current_time( &now ) != 0 ) |
| return( 1 ); |
| |
| return( x509_check_time( &now, to ) ); |
| } |
| |
| int mbedtls_x509_time_is_future( const mbedtls_x509_time *from ) |
| { |
| mbedtls_x509_time now; |
| |
| if( x509_get_current_time( &now ) != 0 ) |
| return( 1 ); |
| |
| return( x509_check_time( from, &now ) ); |
| } |
| #endif /* MBEDTLS_HAVE_TIME_DATE */ |
| |
| void mbedtls_x509_name_free( mbedtls_x509_name *name ) |
| { |
| while( name != NULL ) |
| { |
| mbedtls_x509_name *next = name->next; |
| mbedtls_platform_zeroize( name, sizeof( *name ) ); |
| mbedtls_free( name ); |
| name = next; |
| } |
| } |
| |
| #if defined(MBEDTLS_SELF_TEST) |
| |
| #include "mbedtls/x509_crt.h" |
| #include "mbedtls/certs.h" |
| |
| /* |
| * Checkup routine |
| */ |
| int mbedtls_x509_self_test( int verbose ) |
| { |
| int ret = 0; |
| #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_SHA256_C) |
| uint32_t flags; |
| mbedtls_x509_crt cacert; |
| mbedtls_x509_crt clicert; |
| |
| if( verbose != 0 ) |
| mbedtls_printf( " X.509 certificate load: " ); |
| |
| mbedtls_x509_crt_init( &cacert ); |
| mbedtls_x509_crt_init( &clicert ); |
| |
| ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt, |
| mbedtls_test_cli_crt_len ); |
| if( ret != 0 ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( "failed\n" ); |
| |
| goto cleanup; |
| } |
| |
| ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_ca_crt, |
| mbedtls_test_ca_crt_len ); |
| if( ret != 0 ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( "failed\n" ); |
| |
| goto cleanup; |
| } |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "passed\n X.509 signature verify: "); |
| |
| ret = mbedtls_x509_crt_verify( &clicert, &cacert, NULL, NULL, &flags, NULL, NULL ); |
| if( ret != 0 ) |
| { |
| if( verbose != 0 ) |
| mbedtls_printf( "failed\n" ); |
| |
| goto cleanup; |
| } |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "passed\n\n"); |
| |
| cleanup: |
| mbedtls_x509_crt_free( &cacert ); |
| mbedtls_x509_crt_free( &clicert ); |
| #else |
| ((void) verbose); |
| #endif /* MBEDTLS_CERTS_C && MBEDTLS_SHA1_C */ |
| return( ret ); |
| } |
| |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| #endif /* MBEDTLS_X509_USE_C */ |