| /* |
| * X.509 certificate parsing and verification |
| * |
| * Copyright (C) 2006-2014, Brainspark B.V. |
| * |
| * This file is part of mbed TLS (http://www.polarssl.org) |
| * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> |
| * |
| * All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| /* |
| * 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(POLARSSL_CONFIG_FILE) |
| #include "polarssl/config.h" |
| #else |
| #include POLARSSL_CONFIG_FILE |
| #endif |
| |
| #if defined(POLARSSL_X509_CRT_PARSE_C) |
| |
| #include "polarssl/x509_crt.h" |
| #include "polarssl/oid.h" |
| #if defined(POLARSSL_PEM_PARSE_C) |
| #include "polarssl/pem.h" |
| #endif |
| |
| #if defined(POLARSSL_PLATFORM_C) |
| #include "polarssl/platform.h" |
| #else |
| #define polarssl_malloc malloc |
| #define polarssl_free free |
| #endif |
| |
| #if defined(POLARSSL_THREADING_C) |
| #include "polarssl/threading.h" |
| #endif |
| |
| #include <string.h> |
| #include <stdlib.h> |
| #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) |
| #include <windows.h> |
| #else |
| #include <time.h> |
| #endif |
| |
| #if defined(EFIX64) || defined(EFI32) |
| #include <stdio.h> |
| #endif |
| |
| #if defined(POLARSSL_FS_IO) |
| #include <stdio.h> |
| #if !defined(_WIN32) || defined(EFIX64) || defined(EFI32) |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <dirent.h> |
| #endif |
| #endif |
| |
| /* Implementation that should never be optimized out by the compiler */ |
| static void polarssl_zeroize( void *v, size_t n ) { |
| volatile unsigned char *p = v; while( n-- ) *p++ = 0; |
| } |
| |
| /* |
| * Version ::= INTEGER { v1(0), v2(1), v3(2) } |
| */ |
| static int x509_get_version( unsigned char **p, |
| const unsigned char *end, |
| int *ver ) |
| { |
| int ret; |
| size_t len; |
| |
| if( ( ret = asn1_get_tag( p, end, &len, |
| ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) ) != 0 ) |
| { |
| if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) |
| { |
| *ver = 0; |
| return( 0 ); |
| } |
| |
| return( ret ); |
| } |
| |
| end = *p + len; |
| |
| if( ( ret = asn1_get_int( p, end, ver ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_VERSION + ret ); |
| |
| if( *p != end ) |
| return( POLARSSL_ERR_X509_INVALID_VERSION + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Validity ::= SEQUENCE { |
| * notBefore Time, |
| * notAfter Time } |
| */ |
| static int x509_get_dates( unsigned char **p, |
| const unsigned char *end, |
| x509_time *from, |
| x509_time *to ) |
| { |
| int ret; |
| size_t len; |
| |
| if( ( ret = asn1_get_tag( p, end, &len, |
| ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_DATE + ret ); |
| |
| end = *p + len; |
| |
| if( ( ret = x509_get_time( p, end, from ) ) != 0 ) |
| return( ret ); |
| |
| if( ( ret = x509_get_time( p, end, to ) ) != 0 ) |
| return( ret ); |
| |
| if( *p != end ) |
| return( POLARSSL_ERR_X509_INVALID_DATE + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * X.509 v2/v3 unique identifier (not parsed) |
| */ |
| static int x509_get_uid( unsigned char **p, |
| const unsigned char *end, |
| x509_buf *uid, int n ) |
| { |
| int ret; |
| |
| if( *p == end ) |
| return( 0 ); |
| |
| uid->tag = **p; |
| |
| if( ( ret = asn1_get_tag( p, end, &uid->len, |
| ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | n ) ) != 0 ) |
| { |
| if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) |
| return( 0 ); |
| |
| return( ret ); |
| } |
| |
| uid->p = *p; |
| *p += uid->len; |
| |
| return( 0 ); |
| } |
| |
| static int x509_get_basic_constraints( unsigned char **p, |
| const unsigned char *end, |
| int *ca_istrue, |
| int *max_pathlen ) |
| { |
| int ret; |
| size_t len; |
| |
| /* |
| * BasicConstraints ::= SEQUENCE { |
| * cA BOOLEAN DEFAULT FALSE, |
| * pathLenConstraint INTEGER (0..MAX) OPTIONAL } |
| */ |
| *ca_istrue = 0; /* DEFAULT FALSE */ |
| *max_pathlen = 0; /* endless */ |
| |
| if( ( ret = asn1_get_tag( p, end, &len, |
| ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( *p == end ) |
| return( 0 ); |
| |
| if( ( ret = asn1_get_bool( p, end, ca_istrue ) ) != 0 ) |
| { |
| if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) |
| ret = asn1_get_int( p, end, ca_istrue ); |
| |
| if( ret != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( *ca_istrue != 0 ) |
| *ca_istrue = 1; |
| } |
| |
| if( *p == end ) |
| return( 0 ); |
| |
| if( ( ret = asn1_get_int( p, end, max_pathlen ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( *p != end ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| (*max_pathlen)++; |
| |
| return( 0 ); |
| } |
| |
| static int x509_get_ns_cert_type( unsigned char **p, |
| const unsigned char *end, |
| unsigned char *ns_cert_type) |
| { |
| int ret; |
| x509_bitstring bs = { 0, 0, NULL }; |
| |
| if( ( ret = asn1_get_bitstring( p, end, &bs ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( bs.len != 1 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_INVALID_LENGTH ); |
| |
| /* Get actual bitstring */ |
| *ns_cert_type = *bs.p; |
| return( 0 ); |
| } |
| |
| static int x509_get_key_usage( unsigned char **p, |
| const unsigned char *end, |
| unsigned char *key_usage) |
| { |
| int ret; |
| x509_bitstring bs = { 0, 0, NULL }; |
| |
| if( ( ret = asn1_get_bitstring( p, end, &bs ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( bs.len < 1 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_INVALID_LENGTH ); |
| |
| /* Get actual bitstring */ |
| *key_usage = *bs.p; |
| return( 0 ); |
| } |
| |
| /* |
| * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId |
| * |
| * KeyPurposeId ::= OBJECT IDENTIFIER |
| */ |
| static int x509_get_ext_key_usage( unsigned char **p, |
| const unsigned char *end, |
| x509_sequence *ext_key_usage) |
| { |
| int ret; |
| |
| if( ( ret = asn1_get_sequence_of( p, end, ext_key_usage, ASN1_OID ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| /* Sequence length must be >= 1 */ |
| if( ext_key_usage->buf.p == NULL ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_INVALID_LENGTH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * SubjectAltName ::= GeneralNames |
| * |
| * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName |
| * |
| * GeneralName ::= CHOICE { |
| * otherName [0] OtherName, |
| * rfc822Name [1] IA5String, |
| * dNSName [2] IA5String, |
| * x400Address [3] ORAddress, |
| * directoryName [4] Name, |
| * ediPartyName [5] EDIPartyName, |
| * uniformResourceIdentifier [6] IA5String, |
| * iPAddress [7] OCTET STRING, |
| * registeredID [8] OBJECT IDENTIFIER } |
| * |
| * OtherName ::= SEQUENCE { |
| * type-id OBJECT IDENTIFIER, |
| * value [0] EXPLICIT ANY DEFINED BY type-id } |
| * |
| * EDIPartyName ::= SEQUENCE { |
| * nameAssigner [0] DirectoryString OPTIONAL, |
| * partyName [1] DirectoryString } |
| * |
| * NOTE: we only parse and use dNSName at this point. |
| */ |
| static int x509_get_subject_alt_name( unsigned char **p, |
| const unsigned char *end, |
| x509_sequence *subject_alt_name ) |
| { |
| int ret; |
| size_t len, tag_len; |
| asn1_buf *buf; |
| unsigned char tag; |
| asn1_sequence *cur = subject_alt_name; |
| |
| /* Get main sequence tag */ |
| if( ( ret = asn1_get_tag( p, end, &len, |
| ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( *p + len != end ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| while( *p < end ) |
| { |
| if( ( end - *p ) < 1 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_OUT_OF_DATA ); |
| |
| tag = **p; |
| (*p)++; |
| if( ( ret = asn1_get_len( p, end, &tag_len ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| if( ( tag & ASN1_CONTEXT_SPECIFIC ) != ASN1_CONTEXT_SPECIFIC ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_UNEXPECTED_TAG ); |
| |
| /* Skip everything but DNS name */ |
| if( tag != ( ASN1_CONTEXT_SPECIFIC | 2 ) ) |
| { |
| *p += tag_len; |
| continue; |
| } |
| |
| /* Allocate and assign next pointer */ |
| if( cur->buf.p != NULL ) |
| { |
| if( cur->next != NULL ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS ); |
| |
| cur->next = (asn1_sequence *) polarssl_malloc( |
| sizeof( asn1_sequence ) ); |
| |
| if( cur->next == NULL ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_MALLOC_FAILED ); |
| |
| memset( cur->next, 0, sizeof( asn1_sequence ) ); |
| cur = cur->next; |
| } |
| |
| buf = &(cur->buf); |
| buf->tag = tag; |
| buf->p = *p; |
| buf->len = tag_len; |
| *p += buf->len; |
| } |
| |
| /* Set final sequence entry's next pointer to NULL */ |
| cur->next = NULL; |
| |
| if( *p != end ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * X.509 v3 extensions |
| * |
| * TODO: Perform all of the basic constraints tests required by the RFC |
| * TODO: Set values for undetected extensions to a sane default? |
| * |
| */ |
| static int x509_get_crt_ext( unsigned char **p, |
| const unsigned char *end, |
| x509_crt *crt ) |
| { |
| int ret; |
| size_t len; |
| unsigned char *end_ext_data, *end_ext_octet; |
| |
| if( ( ret = x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 ) |
| { |
| if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) |
| return( 0 ); |
| |
| return( ret ); |
| } |
| |
| while( *p < end ) |
| { |
| /* |
| * Extension ::= SEQUENCE { |
| * extnID OBJECT IDENTIFIER, |
| * critical BOOLEAN DEFAULT FALSE, |
| * extnValue OCTET STRING } |
| */ |
| x509_buf extn_oid = {0, 0, NULL}; |
| int is_critical = 0; /* DEFAULT FALSE */ |
| int ext_type = 0; |
| |
| if( ( ret = asn1_get_tag( p, end, &len, |
| ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| end_ext_data = *p + len; |
| |
| /* Get extension ID */ |
| extn_oid.tag = **p; |
| |
| if( ( ret = asn1_get_tag( p, end, &extn_oid.len, ASN1_OID ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| extn_oid.p = *p; |
| *p += extn_oid.len; |
| |
| if( ( end - *p ) < 1 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_OUT_OF_DATA ); |
| |
| /* Get optional critical */ |
| if( ( ret = asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 && |
| ( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| /* Data should be octet string type */ |
| if( ( ret = asn1_get_tag( p, end_ext_data, &len, |
| ASN1_OCTET_STRING ) ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret ); |
| |
| end_ext_octet = *p + len; |
| |
| if( end_ext_octet != end_ext_data ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| /* |
| * Detect supported extensions |
| */ |
| ret = oid_get_x509_ext_type( &extn_oid, &ext_type ); |
| |
| if( ret != 0 ) |
| { |
| /* No parser found, skip extension */ |
| *p = end_ext_octet; |
| |
| #if !defined(POLARSSL_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION) |
| if( is_critical ) |
| { |
| /* Data is marked as critical: fail */ |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_UNEXPECTED_TAG ); |
| } |
| #endif |
| continue; |
| } |
| |
| /* Forbid repeated extensions */ |
| if( ( crt->ext_types & ext_type ) != 0 ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS ); |
| |
| crt->ext_types |= ext_type; |
| |
| switch( ext_type ) |
| { |
| case EXT_BASIC_CONSTRAINTS: |
| /* Parse basic constraints */ |
| if( ( ret = x509_get_basic_constraints( p, end_ext_octet, |
| &crt->ca_istrue, &crt->max_pathlen ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| case EXT_KEY_USAGE: |
| /* Parse key usage */ |
| if( ( ret = x509_get_key_usage( p, end_ext_octet, |
| &crt->key_usage ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| case EXT_EXTENDED_KEY_USAGE: |
| /* Parse extended key usage */ |
| if( ( ret = x509_get_ext_key_usage( p, end_ext_octet, |
| &crt->ext_key_usage ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| case EXT_SUBJECT_ALT_NAME: |
| /* Parse subject alt name */ |
| if( ( ret = x509_get_subject_alt_name( p, end_ext_octet, |
| &crt->subject_alt_names ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| case EXT_NS_CERT_TYPE: |
| /* Parse netscape certificate type */ |
| if( ( ret = x509_get_ns_cert_type( p, end_ext_octet, |
| &crt->ns_cert_type ) ) != 0 ) |
| return( ret ); |
| break; |
| |
| default: |
| return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE ); |
| } |
| } |
| |
| if( *p != end ) |
| return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Parse and fill a single X.509 certificate in DER format |
| */ |
| static int x509_crt_parse_der_core( x509_crt *crt, const unsigned char *buf, |
| size_t buflen ) |
| { |
| int ret; |
| size_t len; |
| unsigned char *p, *end, *crt_end; |
| x509_buf sig_params1, sig_params2; |
| |
| memset( &sig_params1, 0, sizeof( x509_buf ) ); |
| memset( &sig_params2, 0, sizeof( x509_buf ) ); |
| |
| /* |
| * Check for valid input |
| */ |
| if( crt == NULL || buf == NULL ) |
| return( POLARSSL_ERR_X509_BAD_INPUT_DATA ); |
| |
| p = (unsigned char *) polarssl_malloc( len = buflen ); |
| |
| if( p == NULL ) |
| return( POLARSSL_ERR_X509_MALLOC_FAILED ); |
| |
| memcpy( p, buf, buflen ); |
| |
| crt->raw.p = p; |
| crt->raw.len = len; |
| end = p + len; |
| |
| /* |
| * Certificate ::= SEQUENCE { |
| * tbsCertificate TBSCertificate, |
| * signatureAlgorithm AlgorithmIdentifier, |
| * signatureValue BIT STRING } |
| */ |
| if( ( ret = asn1_get_tag( &p, end, &len, |
| ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_INVALID_FORMAT ); |
| } |
| |
| if( len > (size_t) ( end - p ) ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_INVALID_FORMAT + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| crt_end = p + len; |
| |
| /* |
| * TBSCertificate ::= SEQUENCE { |
| */ |
| crt->tbs.p = p; |
| |
| if( ( ret = asn1_get_tag( &p, end, &len, |
| ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_INVALID_FORMAT + ret ); |
| } |
| |
| end = p + len; |
| crt->tbs.len = end - crt->tbs.p; |
| |
| /* |
| * Version ::= INTEGER { v1(0), v2(1), v3(2) } |
| * |
| * CertificateSerialNumber ::= INTEGER |
| * |
| * signature AlgorithmIdentifier |
| */ |
| if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 || |
| ( ret = x509_get_serial( &p, end, &crt->serial ) ) != 0 || |
| ( ret = x509_get_alg( &p, end, &crt->sig_oid1, |
| &sig_params1 ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| crt->version++; |
| |
| if( crt->version > 3 ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_UNKNOWN_VERSION ); |
| } |
| |
| if( ( ret = x509_get_sig_alg( &crt->sig_oid1, &sig_params1, |
| &crt->sig_md, &crt->sig_pk, |
| &crt->sig_opts ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| /* |
| * issuer Name |
| */ |
| crt->issuer_raw.p = p; |
| |
| if( ( ret = asn1_get_tag( &p, end, &len, |
| ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_INVALID_FORMAT + ret ); |
| } |
| |
| if( ( ret = x509_get_name( &p, p + len, &crt->issuer ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| crt->issuer_raw.len = p - crt->issuer_raw.p; |
| |
| /* |
| * Validity ::= SEQUENCE { |
| * notBefore Time, |
| * notAfter Time } |
| * |
| */ |
| if( ( ret = x509_get_dates( &p, end, &crt->valid_from, |
| &crt->valid_to ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| /* |
| * subject Name |
| */ |
| crt->subject_raw.p = p; |
| |
| if( ( ret = asn1_get_tag( &p, end, &len, |
| ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_INVALID_FORMAT + ret ); |
| } |
| |
| if( len && ( ret = x509_get_name( &p, p + len, &crt->subject ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| crt->subject_raw.len = p - crt->subject_raw.p; |
| |
| /* |
| * SubjectPublicKeyInfo |
| */ |
| if( ( ret = pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| /* |
| * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL, |
| * -- If present, version shall be v2 or v3 |
| * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL, |
| * -- If present, version shall be v2 or v3 |
| * extensions [3] EXPLICIT Extensions OPTIONAL |
| * -- If present, version shall be v3 |
| */ |
| if( crt->version == 2 || crt->version == 3 ) |
| { |
| ret = x509_get_uid( &p, end, &crt->issuer_id, 1 ); |
| if( ret != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| } |
| |
| if( crt->version == 2 || crt->version == 3 ) |
| { |
| ret = x509_get_uid( &p, end, &crt->subject_id, 2 ); |
| if( ret != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| } |
| |
| #if !defined(POLARSSL_X509_ALLOW_EXTENSIONS_NON_V3) |
| if( crt->version == 3 ) |
| { |
| #endif |
| ret = x509_get_crt_ext( &p, end, crt ); |
| if( ret != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| #if !defined(POLARSSL_X509_ALLOW_EXTENSIONS_NON_V3) |
| } |
| #endif |
| |
| if( p != end ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_INVALID_FORMAT + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| |
| end = crt_end; |
| |
| /* |
| * } |
| * -- end of TBSCertificate |
| * |
| * signatureAlgorithm AlgorithmIdentifier, |
| * signatureValue BIT STRING |
| */ |
| if( ( ret = x509_get_alg( &p, end, &crt->sig_oid2, &sig_params2 ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| if( crt->sig_oid1.len != crt->sig_oid2.len || |
| memcmp( crt->sig_oid1.p, crt->sig_oid2.p, crt->sig_oid1.len ) != 0 || |
| sig_params1.len != sig_params2.len || |
| memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_SIG_MISMATCH ); |
| } |
| |
| if( ( ret = x509_get_sig( &p, end, &crt->sig ) ) != 0 ) |
| { |
| x509_crt_free( crt ); |
| return( ret ); |
| } |
| |
| if( p != end ) |
| { |
| x509_crt_free( crt ); |
| return( POLARSSL_ERR_X509_INVALID_FORMAT + |
| POLARSSL_ERR_ASN1_LENGTH_MISMATCH ); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Parse one X.509 certificate in DER format from a buffer and add them to a |
| * chained list |
| */ |
| int x509_crt_parse_der( x509_crt *chain, const unsigned char *buf, |
| size_t buflen ) |
| { |
| int ret; |
| x509_crt *crt = chain, *prev = NULL; |
| |
| /* |
| * Check for valid input |
| */ |
| if( crt == NULL || buf == NULL ) |
| return( POLARSSL_ERR_X509_BAD_INPUT_DATA ); |
| |
| while( crt->version != 0 && crt->next != NULL ) |
| { |
| prev = crt; |
| crt = crt->next; |
| } |
| |
| /* |
| * Add new certificate on the end of the chain if needed. |
| */ |
| if( crt->version != 0 && crt->next == NULL ) |
| { |
| crt->next = (x509_crt *) polarssl_malloc( sizeof( x509_crt ) ); |
| |
| if( crt->next == NULL ) |
| return( POLARSSL_ERR_X509_MALLOC_FAILED ); |
| |
| prev = crt; |
| x509_crt_init( crt->next ); |
| crt = crt->next; |
| } |
| |
| if( ( ret = x509_crt_parse_der_core( crt, buf, buflen ) ) != 0 ) |
| { |
| if( prev ) |
| prev->next = NULL; |
| |
| if( crt != chain ) |
| polarssl_free( crt ); |
| |
| return( ret ); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Parse one or more PEM certificates from a buffer and add them to the chained |
| * list |
| */ |
| int x509_crt_parse( x509_crt *chain, const unsigned char *buf, size_t buflen ) |
| { |
| int success = 0, first_error = 0, total_failed = 0; |
| int buf_format = X509_FORMAT_DER; |
| |
| /* |
| * Check for valid input |
| */ |
| if( chain == NULL || buf == NULL ) |
| return( POLARSSL_ERR_X509_BAD_INPUT_DATA ); |
| |
| /* |
| * Determine buffer content. Buffer contains either one DER certificate or |
| * one or more PEM certificates. |
| */ |
| #if defined(POLARSSL_PEM_PARSE_C) |
| if( strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL ) |
| buf_format = X509_FORMAT_PEM; |
| #endif |
| |
| if( buf_format == X509_FORMAT_DER ) |
| return x509_crt_parse_der( chain, buf, buflen ); |
| |
| #if defined(POLARSSL_PEM_PARSE_C) |
| if( buf_format == X509_FORMAT_PEM ) |
| { |
| int ret; |
| pem_context pem; |
| |
| while( buflen > 0 ) |
| { |
| size_t use_len; |
| pem_init( &pem ); |
| |
| ret = pem_read_buffer( &pem, |
| "-----BEGIN CERTIFICATE-----", |
| "-----END CERTIFICATE-----", |
| buf, NULL, 0, &use_len ); |
| |
| if( ret == 0 ) |
| { |
| /* |
| * Was PEM encoded |
| */ |
| buflen -= use_len; |
| buf += use_len; |
| } |
| else if( ret == POLARSSL_ERR_PEM_BAD_INPUT_DATA ) |
| { |
| return( ret ); |
| } |
| else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT ) |
| { |
| pem_free( &pem ); |
| |
| /* |
| * PEM header and footer were found |
| */ |
| buflen -= use_len; |
| buf += use_len; |
| |
| if( first_error == 0 ) |
| first_error = ret; |
| |
| total_failed++; |
| continue; |
| } |
| else |
| break; |
| |
| ret = x509_crt_parse_der( chain, pem.buf, pem.buflen ); |
| |
| pem_free( &pem ); |
| |
| if( ret != 0 ) |
| { |
| /* |
| * Quit parsing on a memory error |
| */ |
| if( ret == POLARSSL_ERR_X509_MALLOC_FAILED ) |
| return( ret ); |
| |
| if( first_error == 0 ) |
| first_error = ret; |
| |
| total_failed++; |
| continue; |
| } |
| |
| success = 1; |
| } |
| } |
| #endif /* POLARSSL_PEM_PARSE_C */ |
| |
| if( success ) |
| return( total_failed ); |
| else if( first_error ) |
| return( first_error ); |
| else |
| return( POLARSSL_ERR_X509_CERT_UNKNOWN_FORMAT ); |
| } |
| |
| #if defined(POLARSSL_FS_IO) |
| /* |
| * Load one or more certificates and add them to the chained list |
| */ |
| int x509_crt_parse_file( x509_crt *chain, const char *path ) |
| { |
| int ret; |
| size_t n; |
| unsigned char *buf; |
| |
| if( ( ret = pk_load_file( path, &buf, &n ) ) != 0 ) |
| return( ret ); |
| |
| ret = x509_crt_parse( chain, buf, n ); |
| |
| polarssl_zeroize( buf, n + 1 ); |
| polarssl_free( buf ); |
| |
| return( ret ); |
| } |
| |
| #if defined(POLARSSL_THREADING_PTHREAD) |
| static threading_mutex_t readdir_mutex = PTHREAD_MUTEX_INITIALIZER; |
| #endif |
| |
| int x509_crt_parse_path( x509_crt *chain, const char *path ) |
| { |
| int ret = 0; |
| #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) |
| int w_ret; |
| WCHAR szDir[MAX_PATH]; |
| char filename[MAX_PATH]; |
| char *p; |
| int len = (int) strlen( path ); |
| |
| WIN32_FIND_DATAW file_data; |
| HANDLE hFind; |
| |
| if( len > MAX_PATH - 3 ) |
| return( POLARSSL_ERR_X509_BAD_INPUT_DATA ); |
| |
| memset( szDir, 0, sizeof(szDir) ); |
| memset( filename, 0, MAX_PATH ); |
| memcpy( filename, path, len ); |
| filename[len++] = '\\'; |
| p = filename + len; |
| filename[len++] = '*'; |
| |
| w_ret = MultiByteToWideChar( CP_ACP, 0, filename, len, szDir, |
| MAX_PATH - 3 ); |
| |
| hFind = FindFirstFileW( szDir, &file_data ); |
| if( hFind == INVALID_HANDLE_VALUE ) |
| return( POLARSSL_ERR_X509_FILE_IO_ERROR ); |
| |
| len = MAX_PATH - len; |
| do |
| { |
| memset( p, 0, len ); |
| |
| if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ) |
| continue; |
| |
| w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName, |
| lstrlenW( file_data.cFileName ), |
| p, len - 1, |
| NULL, NULL ); |
| |
| w_ret = x509_crt_parse_file( chain, filename ); |
| if( w_ret < 0 ) |
| ret++; |
| else |
| ret += w_ret; |
| } |
| while( FindNextFileW( hFind, &file_data ) != 0 ); |
| |
| if( GetLastError() != ERROR_NO_MORE_FILES ) |
| ret = POLARSSL_ERR_X509_FILE_IO_ERROR; |
| |
| FindClose( hFind ); |
| #else /* _WIN32 */ |
| int t_ret; |
| struct stat sb; |
| struct dirent *entry; |
| char entry_name[255]; |
| DIR *dir = opendir( path ); |
| |
| if( dir == NULL ) |
| return( POLARSSL_ERR_X509_FILE_IO_ERROR ); |
| |
| #if defined(POLARSSL_THREADING_PTHREAD) |
| if( ( ret = polarssl_mutex_lock( &readdir_mutex ) ) != 0 ) |
| return( ret ); |
| #endif |
| |
| while( ( entry = readdir( dir ) ) != NULL ) |
| { |
| snprintf( entry_name, sizeof entry_name, "%s/%s", path, entry->d_name ); |
| |
| if( stat( entry_name, &sb ) == -1 ) |
| { |
| closedir( dir ); |
| ret = POLARSSL_ERR_X509_FILE_IO_ERROR; |
| goto cleanup; |
| } |
| |
| if( !S_ISREG( sb.st_mode ) ) |
| continue; |
| |
| // Ignore parse errors |
| // |
| t_ret = x509_crt_parse_file( chain, entry_name ); |
| if( t_ret < 0 ) |
| ret++; |
| else |
| ret += t_ret; |
| } |
| closedir( dir ); |
| |
| cleanup: |
| #if defined(POLARSSL_THREADING_PTHREAD) |
| if( polarssl_mutex_unlock( &readdir_mutex ) != 0 ) |
| ret = POLARSSL_ERR_THREADING_MUTEX_ERROR; |
| #endif |
| |
| #endif /* _WIN32 */ |
| |
| return( ret ); |
| } |
| #endif /* POLARSSL_FS_IO */ |
| |
| #if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \ |
| !defined(EFI32) |
| #include <stdarg.h> |
| |
| #if !defined vsnprintf |
| #define vsnprintf _vsnprintf |
| #endif // vsnprintf |
| |
| /* |
| * Windows _snprintf and _vsnprintf are not compatible to linux versions. |
| * Result value is not size of buffer needed, but -1 if no fit is possible. |
| * |
| * This fuction tries to 'fix' this by at least suggesting enlarging the |
| * size by 20. |
| */ |
| static int compat_snprintf( char *str, size_t size, const char *format, ... ) |
| { |
| va_list ap; |
| int res = -1; |
| |
| va_start( ap, format ); |
| |
| res = vsnprintf( str, size, format, ap ); |
| |
| va_end( ap ); |
| |
| // No quick fix possible |
| if( res < 0 ) |
| return( (int) size + 20 ); |
| |
| return( res ); |
| } |
| |
| #define snprintf compat_snprintf |
| #endif /* _MSC_VER && !snprintf && !EFIX64 && !EFI32 */ |
| |
| #define POLARSSL_ERR_DEBUG_BUF_TOO_SMALL -2 |
| |
| #define SAFE_SNPRINTF() \ |
| { \ |
| if( ret == -1 ) \ |
| return( -1 ); \ |
| \ |
| if( (unsigned int) ret > n ) { \ |
| p[n - 1] = '\0'; \ |
| return( POLARSSL_ERR_DEBUG_BUF_TOO_SMALL ); \ |
| } \ |
| \ |
| n -= (unsigned int) ret; \ |
| p += (unsigned int) ret; \ |
| } |
| |
| static int x509_info_subject_alt_name( char **buf, size_t *size, |
| const x509_sequence *subject_alt_name ) |
| { |
| size_t i; |
| size_t n = *size; |
| char *p = *buf; |
| const x509_sequence *cur = subject_alt_name; |
| const char *sep = ""; |
| size_t sep_len = 0; |
| |
| while( cur != NULL ) |
| { |
| if( cur->buf.len + sep_len >= n ) |
| { |
| *p = '\0'; |
| return( POLARSSL_ERR_DEBUG_BUF_TOO_SMALL ); |
| } |
| |
| n -= cur->buf.len + sep_len; |
| for( i = 0; i < sep_len; i++ ) |
| *p++ = sep[i]; |
| for( i = 0; i < cur->buf.len; i++ ) |
| *p++ = cur->buf.p[i]; |
| |
| sep = ", "; |
| sep_len = 2; |
| |
| cur = cur->next; |
| } |
| |
| *p = '\0'; |
| |
| *size = n; |
| *buf = p; |
| |
| return( 0 ); |
| } |
| |
| #define PRINT_ITEM(i) \ |
| { \ |
| ret = snprintf( p, n, "%s" i, sep ); \ |
| SAFE_SNPRINTF(); \ |
| sep = ", "; \ |
| } |
| |
| #define CERT_TYPE(type,name) \ |
| if( ns_cert_type & type ) \ |
| PRINT_ITEM( name ); |
| |
| static int x509_info_cert_type( char **buf, size_t *size, |
| unsigned char ns_cert_type ) |
| { |
| int ret; |
| size_t n = *size; |
| char *p = *buf; |
| const char *sep = ""; |
| |
| CERT_TYPE( NS_CERT_TYPE_SSL_CLIENT, "SSL Client" ); |
| CERT_TYPE( NS_CERT_TYPE_SSL_SERVER, "SSL Server" ); |
| CERT_TYPE( NS_CERT_TYPE_EMAIL, "Email" ); |
| CERT_TYPE( NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" ); |
| CERT_TYPE( NS_CERT_TYPE_RESERVED, "Reserved" ); |
| CERT_TYPE( NS_CERT_TYPE_SSL_CA, "SSL CA" ); |
| CERT_TYPE( NS_CERT_TYPE_EMAIL_CA, "Email CA" ); |
| CERT_TYPE( NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" ); |
| |
| *size = n; |
| *buf = p; |
| |
| return( 0 ); |
| } |
| |
| #define KEY_USAGE(code,name) \ |
| if( key_usage & code ) \ |
| PRINT_ITEM( name ); |
| |
| static int x509_info_key_usage( char **buf, size_t *size, |
| unsigned char key_usage ) |
| { |
| int ret; |
| size_t n = *size; |
| char *p = *buf; |
| const char *sep = ""; |
| |
| KEY_USAGE( KU_DIGITAL_SIGNATURE, "Digital Signature" ); |
| KEY_USAGE( KU_NON_REPUDIATION, "Non Repudiation" ); |
| KEY_USAGE( KU_KEY_ENCIPHERMENT, "Key Encipherment" ); |
| KEY_USAGE( KU_DATA_ENCIPHERMENT, "Data Encipherment" ); |
| KEY_USAGE( KU_KEY_AGREEMENT, "Key Agreement" ); |
| KEY_USAGE( KU_KEY_CERT_SIGN, "Key Cert Sign" ); |
| KEY_USAGE( KU_CRL_SIGN, "CRL Sign" ); |
| |
| *size = n; |
| *buf = p; |
| |
| return( 0 ); |
| } |
| |
| static int x509_info_ext_key_usage( char **buf, size_t *size, |
| const x509_sequence *extended_key_usage ) |
| { |
| int ret; |
| const char *desc; |
| size_t n = *size; |
| char *p = *buf; |
| const x509_sequence *cur = extended_key_usage; |
| const char *sep = ""; |
| |
| while( cur != NULL ) |
| { |
| if( oid_get_extended_key_usage( &cur->buf, &desc ) != 0 ) |
| desc = "???"; |
| |
| ret = snprintf( p, n, "%s%s", sep, desc ); |
| SAFE_SNPRINTF(); |
| |
| sep = ", "; |
| |
| cur = cur->next; |
| } |
| |
| *size = n; |
| *buf = p; |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Return an informational string about the certificate. |
| */ |
| #define BEFORE_COLON 18 |
| #define BC "18" |
| int x509_crt_info( char *buf, size_t size, const char *prefix, |
| const x509_crt *crt ) |
| { |
| int ret; |
| size_t n; |
| char *p; |
| char key_size_str[BEFORE_COLON]; |
| |
| p = buf; |
| n = size; |
| |
| ret = snprintf( p, n, "%scert. version : %d\n", |
| prefix, crt->version ); |
| SAFE_SNPRINTF(); |
| ret = snprintf( p, n, "%sserial number : ", |
| prefix ); |
| SAFE_SNPRINTF(); |
| |
| ret = x509_serial_gets( p, n, &crt->serial ); |
| SAFE_SNPRINTF(); |
| |
| ret = snprintf( p, n, "\n%sissuer name : ", prefix ); |
| SAFE_SNPRINTF(); |
| ret = x509_dn_gets( p, n, &crt->issuer ); |
| SAFE_SNPRINTF(); |
| |
| ret = snprintf( p, n, "\n%ssubject name : ", prefix ); |
| SAFE_SNPRINTF(); |
| ret = x509_dn_gets( p, n, &crt->subject ); |
| SAFE_SNPRINTF(); |
| |
| ret = snprintf( p, n, "\n%sissued on : " \ |
| "%04d-%02d-%02d %02d:%02d:%02d", prefix, |
| crt->valid_from.year, crt->valid_from.mon, |
| crt->valid_from.day, crt->valid_from.hour, |
| crt->valid_from.min, crt->valid_from.sec ); |
| SAFE_SNPRINTF(); |
| |
| ret = snprintf( p, n, "\n%sexpires on : " \ |
| "%04d-%02d-%02d %02d:%02d:%02d", prefix, |
| crt->valid_to.year, crt->valid_to.mon, |
| crt->valid_to.day, crt->valid_to.hour, |
| crt->valid_to.min, crt->valid_to.sec ); |
| SAFE_SNPRINTF(); |
| |
| ret = snprintf( p, n, "\n%ssigned using : ", prefix ); |
| SAFE_SNPRINTF(); |
| |
| ret = x509_sig_alg_gets( p, n, &crt->sig_oid1, crt->sig_pk, |
| crt->sig_md, crt->sig_opts ); |
| SAFE_SNPRINTF(); |
| |
| /* Key size */ |
| if( ( ret = x509_key_size_helper( key_size_str, BEFORE_COLON, |
| pk_get_name( &crt->pk ) ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| |
| ret = snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str, |
| (int) pk_get_size( &crt->pk ) ); |
| SAFE_SNPRINTF(); |
| |
| /* |
| * Optional extensions |
| */ |
| |
| if( crt->ext_types & EXT_BASIC_CONSTRAINTS ) |
| { |
| ret = snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix, |
| crt->ca_istrue ? "true" : "false" ); |
| SAFE_SNPRINTF(); |
| |
| if( crt->max_pathlen > 0 ) |
| { |
| ret = snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 ); |
| SAFE_SNPRINTF(); |
| } |
| } |
| |
| if( crt->ext_types & EXT_SUBJECT_ALT_NAME ) |
| { |
| ret = snprintf( p, n, "\n%ssubject alt name : ", prefix ); |
| SAFE_SNPRINTF(); |
| |
| if( ( ret = x509_info_subject_alt_name( &p, &n, |
| &crt->subject_alt_names ) ) != 0 ) |
| return( ret ); |
| } |
| |
| if( crt->ext_types & EXT_NS_CERT_TYPE ) |
| { |
| ret = snprintf( p, n, "\n%scert. type : ", prefix ); |
| SAFE_SNPRINTF(); |
| |
| if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 ) |
| return( ret ); |
| } |
| |
| if( crt->ext_types & EXT_KEY_USAGE ) |
| { |
| ret = snprintf( p, n, "\n%skey usage : ", prefix ); |
| SAFE_SNPRINTF(); |
| |
| if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 ) |
| return( ret ); |
| } |
| |
| if( crt->ext_types & EXT_EXTENDED_KEY_USAGE ) |
| { |
| ret = snprintf( p, n, "\n%sext key usage : ", prefix ); |
| SAFE_SNPRINTF(); |
| |
| if( ( ret = x509_info_ext_key_usage( &p, &n, |
| &crt->ext_key_usage ) ) != 0 ) |
| return( ret ); |
| } |
| |
| ret = snprintf( p, n, "\n" ); |
| SAFE_SNPRINTF(); |
| |
| return( (int) ( size - n ) ); |
| } |
| |
| #if defined(POLARSSL_X509_CHECK_KEY_USAGE) |
| int x509_crt_check_key_usage( const x509_crt *crt, int usage ) |
| { |
| if( ( crt->ext_types & EXT_KEY_USAGE ) != 0 && |
| ( crt->key_usage & usage ) != usage ) |
| return( POLARSSL_ERR_X509_BAD_INPUT_DATA ); |
| |
| return( 0 ); |
| } |
| #endif |
| |
| #if defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE) |
| int x509_crt_check_extended_key_usage( const x509_crt *crt, |
| const char *usage_oid, |
| size_t usage_len ) |
| { |
| const x509_sequence *cur; |
| |
| /* Extension is not mandatory, absent means no restriction */ |
| if( ( crt->ext_types & EXT_EXTENDED_KEY_USAGE ) == 0 ) |
| return( 0 ); |
| |
| /* |
| * Look for the requested usage (or wildcard ANY) in our list |
| */ |
| for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next ) |
| { |
| const x509_buf *cur_oid = &cur->buf; |
| |
| if( cur_oid->len == usage_len && |
| memcmp( cur_oid->p, usage_oid, usage_len ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| if( OID_CMP( OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) ) |
| return( 0 ); |
| } |
| |
| return( POLARSSL_ERR_X509_BAD_INPUT_DATA ); |
| } |
| #endif /* POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE */ |
| |
| #if defined(POLARSSL_X509_CRL_PARSE_C) |
| /* |
| * Return 1 if the certificate is revoked, or 0 otherwise. |
| */ |
| int x509_crt_revoked( const x509_crt *crt, const x509_crl *crl ) |
| { |
| const x509_crl_entry *cur = &crl->entry; |
| |
| while( cur != NULL && cur->serial.len != 0 ) |
| { |
| if( crt->serial.len == cur->serial.len && |
| memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 ) |
| { |
| if( x509_time_expired( &cur->revocation_date ) ) |
| return( 1 ); |
| } |
| |
| cur = cur->next; |
| } |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Check that the given certificate is valid according to the CRL. |
| */ |
| static int x509_crt_verifycrl( x509_crt *crt, x509_crt *ca, |
| x509_crl *crl_list) |
| { |
| int flags = 0; |
| unsigned char hash[POLARSSL_MD_MAX_SIZE]; |
| const md_info_t *md_info; |
| |
| if( ca == NULL ) |
| return( flags ); |
| |
| /* |
| * TODO: What happens if no CRL is present? |
| * Suggestion: Revocation state should be unknown if no CRL is present. |
| * For backwards compatibility this is not yet implemented. |
| */ |
| |
| while( crl_list != NULL ) |
| { |
| if( crl_list->version == 0 || |
| crl_list->issuer_raw.len != ca->subject_raw.len || |
| memcmp( crl_list->issuer_raw.p, ca->subject_raw.p, |
| crl_list->issuer_raw.len ) != 0 ) |
| { |
| crl_list = crl_list->next; |
| continue; |
| } |
| |
| /* |
| * Check if the CA is configured to sign CRLs |
| */ |
| #if defined(POLARSSL_X509_CHECK_KEY_USAGE) |
| if( x509_crt_check_key_usage( ca, KU_CRL_SIGN ) != 0 ) |
| { |
| flags |= BADCRL_NOT_TRUSTED; |
| break; |
| } |
| #endif |
| |
| /* |
| * Check if CRL is correctly signed by the trusted CA |
| */ |
| md_info = md_info_from_type( crl_list->sig_md ); |
| if( md_info == NULL ) |
| { |
| /* |
| * Cannot check 'unknown' hash |
| */ |
| flags |= BADCRL_NOT_TRUSTED; |
| break; |
| } |
| |
| md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash ); |
| |
| if( pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk, |
| crl_list->sig_md, hash, md_info->size, |
| crl_list->sig.p, crl_list->sig.len ) != 0 ) |
| { |
| flags |= BADCRL_NOT_TRUSTED; |
| break; |
| } |
| |
| /* |
| * Check for validity of CRL (Do not drop out) |
| */ |
| if( x509_time_expired( &crl_list->next_update ) ) |
| flags |= BADCRL_EXPIRED; |
| |
| if( x509_time_future( &crl_list->this_update ) ) |
| flags |= BADCRL_FUTURE; |
| |
| /* |
| * Check if certificate is revoked |
| */ |
| if( x509_crt_revoked( crt, crl_list ) ) |
| { |
| flags |= BADCERT_REVOKED; |
| break; |
| } |
| |
| crl_list = crl_list->next; |
| } |
| return( flags ); |
| } |
| #endif /* POLARSSL_X509_CRL_PARSE_C */ |
| |
| /* |
| * Like memcmp, but case-insensitive and always returns -1 if different |
| */ |
| static int x509_memcasecmp( const void *s1, const void *s2, size_t len ) |
| { |
| size_t i; |
| unsigned char diff; |
| const unsigned char *n1 = s1, *n2 = s2; |
| |
| for( i = 0; i < len; 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 ); |
| } |
| |
| /* |
| * Return 1 if match, 0 if not |
| * TODO: inverted return value! |
| */ |
| static int x509_wildcard_verify( const char *cn, x509_buf *name ) |
| { |
| size_t i; |
| size_t cn_idx = 0, cn_len = strlen( cn ); |
| |
| if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' ) |
| return( 0 ); |
| |
| for( i = 0; i < cn_len; ++i ) |
| { |
| if( cn[i] == '.' ) |
| { |
| cn_idx = i; |
| break; |
| } |
| } |
| |
| if( cn_idx == 0 ) |
| return( 0 ); |
| |
| if( cn_len - cn_idx == name->len - 1 && |
| x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 ) |
| { |
| 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 x509_buf *a, const 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 == ASN1_UTF8_STRING || a->tag == ASN1_PRINTABLE_STRING ) && |
| ( b->tag == ASN1_UTF8_STRING || b->tag == ASN1_PRINTABLE_STRING ) && |
| a->len == b->len && |
| x509_memcasecmp( a->p, b->p, b->len ) == 0 ) |
| { |
| return( 0 ); |
| } |
| |
| return( -1 ); |
| } |
| |
| /* |
| * Compare two X.509 Names (aka rdnSequence). |
| * |
| * 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.) |
| * |
| * Return 0 if equal, -1 otherwise. |
| */ |
| static int x509_name_cmp( const x509_name *a, const x509_name *b ) |
| { |
| /* Avoid recursion, it might not be optimised by the compiler */ |
| while( a != NULL || b != NULL ) |
| { |
| if( a == NULL || b == NULL ) |
| return( -1 ); |
| |
| /* type */ |
| if( a->oid.tag != b->oid.tag || |
| a->oid.len != b->oid.len || |
| memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 ) |
| { |
| return( -1 ); |
| } |
| |
| /* value */ |
| if( x509_string_cmp( &a->val, &b->val ) != 0 ) |
| return( -1 ); |
| |
| a = a->next; |
| b = b->next; |
| } |
| |
| /* a == NULL == b */ |
| return( 0 ); |
| } |
| |
| /* |
| * Check if 'parent' is a suitable parent (signing CA) for 'child'. |
| * Return 0 if yes, -1 if not. |
| * |
| * top means parent is a locally-trusted certificate |
| * bottom means child is the end entity cert |
| */ |
| static int x509_crt_check_parent( const x509_crt *child, |
| const x509_crt *parent, |
| int top, int bottom ) |
| { |
| int need_ca_bit; |
| |
| /* Parent must be the issuer */ |
| if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 ) |
| return( -1 ); |
| |
| /* Parent must have the basicConstraints CA bit set as a general rule */ |
| need_ca_bit = 1; |
| |
| /* Exception: v1/v2 certificates that are locally trusted. */ |
| if( top && parent->version < 3 ) |
| need_ca_bit = 0; |
| |
| /* Exception: self-signed end-entity certs that are locally trusted. */ |
| if( top && bottom && |
| child->raw.len == parent->raw.len && |
| memcmp( child->raw.p, parent->raw.p, child->raw.len ) == 0 ) |
| { |
| need_ca_bit = 0; |
| } |
| |
| if( need_ca_bit && ! parent->ca_istrue ) |
| return( -1 ); |
| |
| #if defined(POLARSSL_X509_CHECK_KEY_USAGE) |
| if( need_ca_bit && |
| x509_crt_check_key_usage( parent, KU_KEY_CERT_SIGN ) != 0 ) |
| { |
| return( -1 ); |
| } |
| #endif |
| |
| return( 0 ); |
| } |
| |
| static int x509_crt_verify_top( |
| x509_crt *child, x509_crt *trust_ca, |
| x509_crl *ca_crl, int path_cnt, int *flags, |
| int (*f_vrfy)(void *, x509_crt *, int, int *), |
| void *p_vrfy ) |
| { |
| int ret; |
| int ca_flags = 0, check_path_cnt = path_cnt + 1; |
| unsigned char hash[POLARSSL_MD_MAX_SIZE]; |
| const md_info_t *md_info; |
| |
| if( x509_time_expired( &child->valid_to ) ) |
| *flags |= BADCERT_EXPIRED; |
| |
| if( x509_time_future( &child->valid_from ) ) |
| *flags |= BADCERT_FUTURE; |
| |
| /* |
| * Child is the top of the chain. Check against the trust_ca list. |
| */ |
| *flags |= BADCERT_NOT_TRUSTED; |
| |
| md_info = md_info_from_type( child->sig_md ); |
| if( md_info == NULL ) |
| { |
| /* |
| * Cannot check 'unknown', no need to try any CA |
| */ |
| trust_ca = NULL; |
| } |
| else |
| md( md_info, child->tbs.p, child->tbs.len, hash ); |
| |
| for( /* trust_ca */ ; trust_ca != NULL; trust_ca = trust_ca->next ) |
| { |
| if( x509_crt_check_parent( child, trust_ca, 1, path_cnt == 0 ) != 0 ) |
| continue; |
| |
| /* |
| * Reduce path_len to check against if top of the chain is |
| * the same as the trusted CA |
| */ |
| if( child->subject_raw.len == trust_ca->subject_raw.len && |
| memcmp( child->subject_raw.p, trust_ca->subject_raw.p, |
| child->issuer_raw.len ) == 0 ) |
| { |
| check_path_cnt--; |
| } |
| |
| if( trust_ca->max_pathlen > 0 && |
| trust_ca->max_pathlen < check_path_cnt ) |
| { |
| continue; |
| } |
| |
| if( pk_verify_ext( child->sig_pk, child->sig_opts, &trust_ca->pk, |
| child->sig_md, hash, md_info->size, |
| child->sig.p, child->sig.len ) != 0 ) |
| { |
| continue; |
| } |
| |
| /* |
| * Top of chain is signed by a trusted CA |
| */ |
| *flags &= ~BADCERT_NOT_TRUSTED; |
| break; |
| } |
| |
| /* |
| * If top of chain is not the same as the trusted CA send a verify request |
| * to the callback for any issues with validity and CRL presence for the |
| * trusted CA certificate. |
| */ |
| if( trust_ca != NULL && |
| ( child->subject_raw.len != trust_ca->subject_raw.len || |
| memcmp( child->subject_raw.p, trust_ca->subject_raw.p, |
| child->issuer_raw.len ) != 0 ) ) |
| { |
| #if defined(POLARSSL_X509_CRL_PARSE_C) |
| /* Check trusted CA's CRL for the chain's top crt */ |
| *flags |= x509_crt_verifycrl( child, trust_ca, ca_crl ); |
| #else |
| ((void) ca_crl); |
| #endif |
| |
| if( x509_time_expired( &trust_ca->valid_to ) ) |
| ca_flags |= BADCERT_EXPIRED; |
| |
| if( x509_time_future( &trust_ca->valid_from ) ) |
| ca_flags |= BADCERT_FUTURE; |
| |
| if( NULL != f_vrfy ) |
| { |
| if( ( ret = f_vrfy( p_vrfy, trust_ca, path_cnt + 1, |
| &ca_flags ) ) != 0 ) |
| { |
| return( ret ); |
| } |
| } |
| } |
| |
| /* Call callback on top cert */ |
| if( NULL != f_vrfy ) |
| { |
| if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 ) |
| return( ret ); |
| } |
| |
| *flags |= ca_flags; |
| |
| return( 0 ); |
| } |
| |
| static int x509_crt_verify_child( |
| x509_crt *child, x509_crt *parent, x509_crt *trust_ca, |
| x509_crl *ca_crl, int path_cnt, int *flags, |
| int (*f_vrfy)(void *, x509_crt *, int, int *), |
| void *p_vrfy ) |
| { |
| int ret; |
| int parent_flags = 0; |
| unsigned char hash[POLARSSL_MD_MAX_SIZE]; |
| x509_crt *grandparent; |
| const md_info_t *md_info; |
| |
| /* path_cnt is 0 for the first intermediate CA */ |
| if( 1 + path_cnt > POLARSSL_X509_MAX_INTERMEDIATE_CA ) |
| { |
| *flags |= BADCERT_NOT_TRUSTED; |
| return( POLARSSL_ERR_X509_CERT_VERIFY_FAILED ); |
| } |
| |
| if( x509_time_expired( &child->valid_to ) ) |
| *flags |= BADCERT_EXPIRED; |
| |
| if( x509_time_future( &child->valid_from ) ) |
| *flags |= BADCERT_FUTURE; |
| |
| md_info = md_info_from_type( child->sig_md ); |
| if( md_info == NULL ) |
| { |
| /* |
| * Cannot check 'unknown' hash |
| */ |
| *flags |= BADCERT_NOT_TRUSTED; |
| } |
| else |
| { |
| md( md_info, child->tbs.p, child->tbs.len, hash ); |
| |
| if( pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk, |
| child->sig_md, hash, md_info->size, |
| child->sig.p, child->sig.len ) != 0 ) |
| { |
| *flags |= BADCERT_NOT_TRUSTED; |
| } |
| } |
| |
| #if defined(POLARSSL_X509_CRL_PARSE_C) |
| /* Check trusted CA's CRL for the given crt */ |
| *flags |= x509_crt_verifycrl(child, parent, ca_crl); |
| #endif |
| |
| /* Look for a grandparent upwards the chain */ |
| for( grandparent = parent->next; |
| grandparent != NULL; |
| grandparent = grandparent->next ) |
| { |
| if( x509_crt_check_parent( parent, grandparent, |
| 0, path_cnt == 0 ) == 0 ) |
| break; |
| } |
| |
| /* Is our parent part of the chain or at the top? */ |
| if( grandparent != NULL ) |
| { |
| ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl, |
| path_cnt + 1, &parent_flags, f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| return( ret ); |
| } |
| else |
| { |
| ret = x509_crt_verify_top( parent, trust_ca, ca_crl, |
| path_cnt + 1, &parent_flags, f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| return( ret ); |
| } |
| |
| /* child is verified to be a child of the parent, call verify callback */ |
| if( NULL != f_vrfy ) |
| if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 ) |
| return( ret ); |
| |
| *flags |= parent_flags; |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Verify the certificate validity |
| */ |
| int x509_crt_verify( x509_crt *crt, |
| x509_crt *trust_ca, |
| x509_crl *ca_crl, |
| const char *cn, int *flags, |
| int (*f_vrfy)(void *, x509_crt *, int, int *), |
| void *p_vrfy ) |
| { |
| size_t cn_len; |
| int ret; |
| int pathlen = 0; |
| x509_crt *parent; |
| x509_name *name; |
| x509_sequence *cur = NULL; |
| |
| *flags = 0; |
| |
| if( cn != NULL ) |
| { |
| name = &crt->subject; |
| cn_len = strlen( cn ); |
| |
| if( crt->ext_types & EXT_SUBJECT_ALT_NAME ) |
| { |
| cur = &crt->subject_alt_names; |
| |
| while( cur != NULL ) |
| { |
| if( cur->buf.len == cn_len && |
| x509_memcasecmp( cn, cur->buf.p, cn_len ) == 0 ) |
| break; |
| |
| if( cur->buf.len > 2 && |
| memcmp( cur->buf.p, "*.", 2 ) == 0 && |
| x509_wildcard_verify( cn, &cur->buf ) ) |
| break; |
| |
| cur = cur->next; |
| } |
| |
| if( cur == NULL ) |
| *flags |= BADCERT_CN_MISMATCH; |
| } |
| else |
| { |
| while( name != NULL ) |
| { |
| if( OID_CMP( OID_AT_CN, &name->oid ) ) |
| { |
| if( name->val.len == cn_len && |
| x509_memcasecmp( name->val.p, cn, cn_len ) == 0 ) |
| break; |
| |
| if( name->val.len > 2 && |
| memcmp( name->val.p, "*.", 2 ) == 0 && |
| x509_wildcard_verify( cn, &name->val ) ) |
| break; |
| } |
| |
| name = name->next; |
| } |
| |
| if( name == NULL ) |
| *flags |= BADCERT_CN_MISMATCH; |
| } |
| } |
| |
| /* Look for a parent upwards the chain */ |
| for( parent = crt->next; parent != NULL; parent = parent->next ) |
| { |
| if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 ) |
| break; |
| } |
| |
| /* Are we part of the chain or at the top? */ |
| if( parent != NULL ) |
| { |
| ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl, |
| pathlen, flags, f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| return( ret ); |
| } |
| else |
| { |
| ret = x509_crt_verify_top( crt, trust_ca, ca_crl, |
| pathlen, flags, f_vrfy, p_vrfy ); |
| if( ret != 0 ) |
| return( ret ); |
| } |
| |
| if( *flags != 0 ) |
| return( POLARSSL_ERR_X509_CERT_VERIFY_FAILED ); |
| |
| return( 0 ); |
| } |
| |
| /* |
| * Initialize a certificate chain |
| */ |
| void x509_crt_init( x509_crt *crt ) |
| { |
| memset( crt, 0, sizeof(x509_crt) ); |
| } |
| |
| /* |
| * Unallocate all certificate data |
| */ |
| void x509_crt_free( x509_crt *crt ) |
| { |
| x509_crt *cert_cur = crt; |
| x509_crt *cert_prv; |
| x509_name *name_cur; |
| x509_name *name_prv; |
| x509_sequence *seq_cur; |
| x509_sequence *seq_prv; |
| |
| if( crt == NULL ) |
| return; |
| |
| do |
| { |
| pk_free( &cert_cur->pk ); |
| |
| #if defined(POLARSSL_X509_RSASSA_PSS_SUPPORT) |
| polarssl_free( cert_cur->sig_opts ); |
| #endif |
| |
| name_cur = cert_cur->issuer.next; |
| while( name_cur != NULL ) |
| { |
| name_prv = name_cur; |
| name_cur = name_cur->next; |
| polarssl_zeroize( name_prv, sizeof( x509_name ) ); |
| polarssl_free( name_prv ); |
| } |
| |
| name_cur = cert_cur->subject.next; |
| while( name_cur != NULL ) |
| { |
| name_prv = name_cur; |
| name_cur = name_cur->next; |
| polarssl_zeroize( name_prv, sizeof( x509_name ) ); |
| polarssl_free( name_prv ); |
| } |
| |
| seq_cur = cert_cur->ext_key_usage.next; |
| while( seq_cur != NULL ) |
| { |
| seq_prv = seq_cur; |
| seq_cur = seq_cur->next; |
| polarssl_zeroize( seq_prv, sizeof( x509_sequence ) ); |
| polarssl_free( seq_prv ); |
| } |
| |
| seq_cur = cert_cur->subject_alt_names.next; |
| while( seq_cur != NULL ) |
| { |
| seq_prv = seq_cur; |
| seq_cur = seq_cur->next; |
| polarssl_zeroize( seq_prv, sizeof( x509_sequence ) ); |
| polarssl_free( seq_prv ); |
| } |
| |
| if( cert_cur->raw.p != NULL ) |
| { |
| polarssl_zeroize( cert_cur->raw.p, cert_cur->raw.len ); |
| polarssl_free( cert_cur->raw.p ); |
| } |
| |
| cert_cur = cert_cur->next; |
| } |
| while( cert_cur != NULL ); |
| |
| cert_cur = crt; |
| do |
| { |
| cert_prv = cert_cur; |
| cert_cur = cert_cur->next; |
| |
| polarssl_zeroize( cert_prv, sizeof( x509_crt ) ); |
| if( cert_prv != crt ) |
| polarssl_free( cert_prv ); |
| } |
| while( cert_cur != NULL ); |
| } |
| |
| #endif /* POLARSSL_X509_CRT_PARSE_C */ |