/* * 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" /* We include x509xxx.c files here so that x509.c is one compilation unit including * all the x509 files. This is done because some of the internal functions are shared. * For code size savings internal functions should be static so that compiler can do better job * when optimizing. We don't wan't x509.c file to get too big so including .c files. */ #include "x509_crl.c" #include "x509_crt.c" #include "x509_csr.c" #include "x509_create.c" #include "x509write_crt.c" #include "x509write_csr.c" #include #include #if defined(MBEDTLS_PEM_PARSE_C) #include "mbedtls/pem.h" #endif #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #include #include #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 #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 */ static 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 ); } #if defined(MBEDTLS_X509_CRL_PARSE_C) || defined(MBEDTLS_X509_CSR_PARSE_C) || \ ( !defined(MBEDTLS_X509_ON_DEMAND_PARSING) && defined(MBEDTLS_X509_CRT_PARSE_C) ) /* * Parse an algorithm identifier with (optional) parameters */ static 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 ); } #endif /* defined(MBEDTLS_X509_CRL_PARSE_C) || defined(MBEDTLS_X509_CSR_PARSE_C) || ( !defined(MBEDTLS_X509_ON_DEMAND_PARSING) && defined(MBEDTLS_X509_CRT_PARSE_C) ) */ #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) /* Get an algorithm identifier without parameters (eg for signatures) * * AlgorithmIdentifier ::= SEQUENCE { * algorithm OBJECT IDENTIFIER, * parameters ANY DEFINED BY algorithm OPTIONAL } */ static 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 ); } /* * 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 = 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. */ static 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 */ static 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 && mbedtls_platform_memequal( 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. */ static 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 || mbedtls_platform_memequal( 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 ); } static int mbedtls_x509_get_name( unsigned char *p, size_t len, mbedtls_x509_name *cur ) { mbedtls_x509_buf_raw name_buf = { p, len }; mbedtls_platform_memset( cur, 0, sizeof( mbedtls_x509_name ) ); return( mbedtls_x509_name_cmp_raw( &name_buf, &name_buf, x509_get_name_cb, &cur ) ); } #if ( !defined(MBEDTLS_X509_CRT_REMOVE_TIME) && defined(MBEDTLS_X509_CRT_PARSE_C) ) || \ defined(MBEDTLS_X509_CRL_PARSE_C) 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 } */ static 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 ); } #endif /* ( !defined(MBEDTLS_X509_CRT_REMOVE_TIME) && defined(MBEDTLS_X509_CRT_PARSE_C) ) || defined(MBEDTLS_X509_CRL_PARSE_C) */ static 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 ); } static 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 */ static 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 ); } #if defined(MBEDTLS_X509_CRL_PARSE_C) /* * X.509 Extensions (No parsing of extensions, pointer should * be either manually updated or extensions should be parsed!) */ static 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 ); } #endif /* defined(MBEDTLS_X509_CRL_PARSE_C) */ /* * 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 */ static 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; mbedtls_md_handle_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 ) ); } /* * Helper for writing "RSA key size", "EC key size", etc */ static 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 ); } #endif /* !MBEDTLS_X509_REMOVE_INFO */ #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, #if !defined(MBEDTLS_X509_REMOVE_HOSTNAME_VERIFICATION) NULL, #endif /* !MBEDTLS_X509_REMOVE_HOSTNAME_VERIFICATION */ &flags #if !defined(MBEDTLS_X509_REMOVE_VERIFY_CALLBACK) , NULL, NULL #endif ); 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_SHA256_C */ return( ret ); } #endif /* MBEDTLS_SELF_TEST */ #endif /* MBEDTLS_X509_USE_C */