From 9db10386430479067795bec66bb26343ff176ded Mon Sep 17 00:00:00 2001 From: Adam Harrison Date: Thu, 6 Jul 2023 06:37:41 -0400 Subject: Removed old mbedtls, replacing with submodule. --- lib/mbedtls-2.27.0/library/x509_crt.c | 3401 --------------------------------- 1 file changed, 3401 deletions(-) delete mode 100644 lib/mbedtls-2.27.0/library/x509_crt.c (limited to 'lib/mbedtls-2.27.0/library/x509_crt.c') diff --git a/lib/mbedtls-2.27.0/library/x509_crt.c b/lib/mbedtls-2.27.0/library/x509_crt.c deleted file mode 100644 index acdd545..0000000 --- a/lib/mbedtls-2.27.0/library/x509_crt.c +++ /dev/null @@ -1,3401 +0,0 @@ -/* - * X.509 certificate parsing and verification - * - * Copyright The Mbed TLS Contributors - * 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. - */ -/* - * 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 - * - * [SIRO] https://cabforum.org/wp-content/uploads/Chunghwatelecom201503cabforumV4.pdf - */ - -#include "common.h" - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - -#include "mbedtls/x509_crt.h" -#include "mbedtls/error.h" -#include "mbedtls/oid.h" -#include "mbedtls/platform_util.h" - -#include - -#if defined(MBEDTLS_PEM_PARSE_C) -#include "mbedtls/pem.h" -#endif - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -#include "psa/crypto.h" -#include "mbedtls/psa_util.h" -#endif - -#if defined(MBEDTLS_PLATFORM_C) -#include "mbedtls/platform.h" -#else -#include -#include -#define mbedtls_free free -#define mbedtls_calloc calloc -#define mbedtls_snprintf snprintf -#endif - -#if defined(MBEDTLS_THREADING_C) -#include "mbedtls/threading.h" -#endif - -#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) -#include -#else -#include -#endif - -#if defined(MBEDTLS_FS_IO) -#include -#if !defined(_WIN32) || defined(EFIX64) || defined(EFI32) -#include -#include -#include -#endif /* !_WIN32 || EFIX64 || EFI32 */ -#endif - -/* - * Item in a verification chain: cert and flags for it - */ -typedef struct { - mbedtls_x509_crt *crt; - uint32_t flags; -} x509_crt_verify_chain_item; - -/* - * Max size of verification chain: end-entity + intermediates + trusted root - */ -#define X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 ) - -/* Default profile. Do not remove items unless there are serious security - * concerns. */ -const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default = -{ -#if defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES) - /* Allow SHA-1 (weak, but still safe in controlled environments) */ - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 ) | -#endif - /* Only SHA-2 hashes */ - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ), - 0xFFFFFFF, /* Any PK alg */ - 0xFFFFFFF, /* Any curve */ - 2048, -}; - -/* - * Next-default profile - */ -const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next = -{ - /* Hashes from SHA-256 and above */ - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ), - 0xFFFFFFF, /* Any PK alg */ -#if defined(MBEDTLS_ECP_C) - /* Curves at or above 128-bit security level */ - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ), -#else - 0, -#endif - 2048, -}; - -/* - * NSA Suite B Profile - */ -const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb = -{ - /* Only SHA-256 and 384 */ - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ), - /* Only ECDSA */ - MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECKEY ), -#if defined(MBEDTLS_ECP_C) - /* Only NIST P-256 and P-384 */ - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) | - MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ), -#else - 0, -#endif - 0, -}; - -/* - * Check md_alg against profile - * Return 0 if md_alg is acceptable for this profile, -1 otherwise - */ -static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile, - mbedtls_md_type_t md_alg ) -{ - if( md_alg == MBEDTLS_MD_NONE ) - return( -1 ); - - if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 ) - return( 0 ); - - return( -1 ); -} - -/* - * Check pk_alg against profile - * Return 0 if pk_alg is acceptable for this profile, -1 otherwise - */ -static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile, - mbedtls_pk_type_t pk_alg ) -{ - if( pk_alg == MBEDTLS_PK_NONE ) - return( -1 ); - - if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 ) - return( 0 ); - - return( -1 ); -} - -/* - * Check key against profile - * Return 0 if pk is acceptable for this profile, -1 otherwise - */ -static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile, - const mbedtls_pk_context *pk ) -{ - const mbedtls_pk_type_t pk_alg = mbedtls_pk_get_type( pk ); - -#if defined(MBEDTLS_RSA_C) - if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS ) - { - if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen ) - return( 0 ); - - return( -1 ); - } -#endif - -#if defined(MBEDTLS_ECP_C) - if( pk_alg == MBEDTLS_PK_ECDSA || - pk_alg == MBEDTLS_PK_ECKEY || - pk_alg == MBEDTLS_PK_ECKEY_DH ) - { - const mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp.id; - - if( gid == MBEDTLS_ECP_DP_NONE ) - return( -1 ); - - if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 ) - return( 0 ); - - return( -1 ); - } -#endif - - return( -1 ); -} - -/* - * 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 0 if name matches wildcard, -1 otherwise - */ -static int x509_check_wildcard( const char *cn, const mbedtls_x509_buf *name ) -{ - size_t i; - size_t cn_idx = 0, cn_len = strlen( cn ); - - /* We can't have a match if there is no wildcard to match */ - if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' ) - return( -1 ); - - for( i = 0; i < cn_len; ++i ) - { - if( cn[i] == '.' ) - { - cn_idx = i; - break; - } - } - - if( cn_idx == 0 ) - return( -1 ); - - if( cn_len - cn_idx == name->len - 1 && - x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 ) - { - return( 0 ); - } - - return( -1 ); -} - -/* - * 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 ) && - 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 mbedtls_x509_name *a, const mbedtls_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 ); - - /* structure of the list of sets */ - if( a->next_merged != b->next_merged ) - return( -1 ); - - a = a->next; - b = b->next; - } - - /* a == NULL == b */ - return( 0 ); -} - -/* - * Reset (init or clear) a verify_chain - */ -static void x509_crt_verify_chain_reset( - mbedtls_x509_crt_verify_chain *ver_chain ) -{ - size_t i; - - for( i = 0; i < MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE; i++ ) - { - ver_chain->items[i].crt = NULL; - ver_chain->items[i].flags = (uint32_t) -1; - } - - ver_chain->len = 0; - -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) - ver_chain->trust_ca_cb_result = NULL; -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ -} - -/* - * Version ::= INTEGER { v1(0), v2(1), v3(2) } - */ -static int x509_get_version( unsigned char **p, - const unsigned char *end, - int *ver ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len; - - if( ( ret = mbedtls_asn1_get_tag( p, end, &len, - MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 ) - { - if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) - { - *ver = 0; - return( 0 ); - } - - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) ); - } - - end = *p + len; - - if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_VERSION, ret ) ); - - if( *p != end ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_VERSION, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - return( 0 ); -} - -/* - * Validity ::= SEQUENCE { - * notBefore Time, - * notAfter Time } - */ -static int x509_get_dates( unsigned char **p, - const unsigned char *end, - mbedtls_x509_time *from, - mbedtls_x509_time *to ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len; - - if( ( ret = mbedtls_asn1_get_tag( p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_DATE, ret ) ); - - end = *p + len; - - if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 ) - return( ret ); - - if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 ) - return( ret ); - - if( *p != end ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_DATE, - MBEDTLS_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, - mbedtls_x509_buf *uid, int n ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( *p == end ) - return( 0 ); - - uid->tag = **p; - - if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len, - MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 ) - { - if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) - return( 0 ); - - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, 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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - 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 = mbedtls_asn1_get_tag( p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( *p == end ) - return( 0 ); - - if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 ) - { - if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) - ret = mbedtls_asn1_get_int( p, end, ca_istrue ); - - if( ret != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( *ca_istrue != 0 ) - *ca_istrue = 1; - } - - if( *p == end ) - return( 0 ); - - if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( *p != end ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - /* Do not accept max_pathlen equal to INT_MAX to avoid a signed integer - * overflow, which is an undefined behavior. */ - if( *max_pathlen == INT_MAX ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_INVALID_LENGTH ) ); - - (*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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_x509_bitstring bs = { 0, 0, NULL }; - - if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( bs.len != 1 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_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 int *key_usage) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t i; - mbedtls_x509_bitstring bs = { 0, 0, NULL }; - - if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( bs.len < 1 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_INVALID_LENGTH ) ); - - /* Get actual bitstring */ - *key_usage = 0; - for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ ) - { - *key_usage |= (unsigned int) bs.p[i] << (8*i); - } - - 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, - mbedtls_x509_sequence *ext_key_usage) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - /* Sequence length must be >= 1 */ - if( ext_key_usage->buf.p == NULL ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_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 list all types, but only use dNSName and otherName - * of type HwModuleName, as defined in RFC 4108, at this point. - */ -static int x509_get_subject_alt_name( unsigned char **p, - const unsigned char *end, - mbedtls_x509_sequence *subject_alt_name ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len, tag_len; - mbedtls_asn1_buf *buf; - unsigned char tag; - mbedtls_asn1_sequence *cur = subject_alt_name; - - /* Get main sequence tag */ - if( ( ret = mbedtls_asn1_get_tag( p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( *p + len != end ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - while( *p < end ) - { - mbedtls_x509_subject_alternative_name dummy_san_buf; - memset( &dummy_san_buf, 0, sizeof( dummy_san_buf ) ); - - tag = **p; - (*p)++; - if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( ( tag & MBEDTLS_ASN1_TAG_CLASS_MASK ) != - MBEDTLS_ASN1_CONTEXT_SPECIFIC ) - { - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ); - } - - /* - * Check that the SAN is structured correctly. - */ - ret = mbedtls_x509_parse_subject_alt_name( &(cur->buf), &dummy_san_buf ); - /* - * In case the extension is malformed, return an error, - * and clear the allocated sequences. - */ - if( ret != 0 && ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ) - { - mbedtls_x509_sequence *seq_cur = subject_alt_name->next; - mbedtls_x509_sequence *seq_prv; - while( seq_cur != NULL ) - { - seq_prv = seq_cur; - seq_cur = seq_cur->next; - mbedtls_platform_zeroize( seq_prv, - sizeof( mbedtls_x509_sequence ) ); - mbedtls_free( seq_prv ); - } - subject_alt_name->next = NULL; - return( ret ); - } - - /* Allocate and assign next pointer */ - if( cur->buf.p != NULL ) - { - if( cur->next != NULL ) - return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); - - cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) ); - - if( cur->next == NULL ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_ALLOC_FAILED ) ); - - 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( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - return( 0 ); -} - -/* - * id-ce-certificatePolicies OBJECT IDENTIFIER ::= { id-ce 32 } - * - * anyPolicy OBJECT IDENTIFIER ::= { id-ce-certificatePolicies 0 } - * - * certificatePolicies ::= SEQUENCE SIZE (1..MAX) OF PolicyInformation - * - * PolicyInformation ::= SEQUENCE { - * policyIdentifier CertPolicyId, - * policyQualifiers SEQUENCE SIZE (1..MAX) OF - * PolicyQualifierInfo OPTIONAL } - * - * CertPolicyId ::= OBJECT IDENTIFIER - * - * PolicyQualifierInfo ::= SEQUENCE { - * policyQualifierId PolicyQualifierId, - * qualifier ANY DEFINED BY policyQualifierId } - * - * -- policyQualifierIds for Internet policy qualifiers - * - * id-qt OBJECT IDENTIFIER ::= { id-pkix 2 } - * id-qt-cps OBJECT IDENTIFIER ::= { id-qt 1 } - * id-qt-unotice OBJECT IDENTIFIER ::= { id-qt 2 } - * - * PolicyQualifierId ::= OBJECT IDENTIFIER ( id-qt-cps | id-qt-unotice ) - * - * Qualifier ::= CHOICE { - * cPSuri CPSuri, - * userNotice UserNotice } - * - * CPSuri ::= IA5String - * - * UserNotice ::= SEQUENCE { - * noticeRef NoticeReference OPTIONAL, - * explicitText DisplayText OPTIONAL } - * - * NoticeReference ::= SEQUENCE { - * organization DisplayText, - * noticeNumbers SEQUENCE OF INTEGER } - * - * DisplayText ::= CHOICE { - * ia5String IA5String (SIZE (1..200)), - * visibleString VisibleString (SIZE (1..200)), - * bmpString BMPString (SIZE (1..200)), - * utf8String UTF8String (SIZE (1..200)) } - * - * NOTE: we only parse and use anyPolicy without qualifiers at this point - * as defined in RFC 5280. - */ -static int x509_get_certificate_policies( unsigned char **p, - const unsigned char *end, - mbedtls_x509_sequence *certificate_policies ) -{ - int ret, parse_ret = 0; - size_t len; - mbedtls_asn1_buf *buf; - mbedtls_asn1_sequence *cur = certificate_policies; - - /* Get main sequence tag */ - ret = mbedtls_asn1_get_tag( p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ); - if( ret != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( *p + len != end ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - /* - * Cannot be an empty sequence. - */ - if( len == 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - while( *p < end ) - { - mbedtls_x509_buf policy_oid; - const unsigned char *policy_end; - - /* - * Get the policy sequence - */ - if( ( ret = mbedtls_asn1_get_tag( p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - policy_end = *p + len; - - if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len, - MBEDTLS_ASN1_OID ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - policy_oid.tag = MBEDTLS_ASN1_OID; - policy_oid.len = len; - policy_oid.p = *p; - - /* - * Only AnyPolicy is currently supported when enforcing policy. - */ - if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_POLICY, &policy_oid ) != 0 ) - { - /* - * Set the parsing return code but continue parsing, in case this - * extension is critical and MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION - * is configured. - */ - parse_ret = MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE; - } - - /* Allocate and assign next pointer */ - if( cur->buf.p != NULL ) - { - if( cur->next != NULL ) - return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); - - cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) ); - - if( cur->next == NULL ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_ALLOC_FAILED ) ); - - cur = cur->next; - } - - buf = &( cur->buf ); - buf->tag = policy_oid.tag; - buf->p = policy_oid.p; - buf->len = policy_oid.len; - - *p += len; - - /* - * If there is an optional qualifier, then *p < policy_end - * Check the Qualifier len to verify it doesn't exceed policy_end. - */ - if( *p < policy_end ) - { - if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - /* - * Skip the optional policy qualifiers. - */ - *p += len; - } - - if( *p != policy_end ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - } - - /* Set final sequence entry's next pointer to NULL */ - cur->next = NULL; - - if( *p != end ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - return( parse_ret ); -} - -/* - * X.509 v3 extensions - * - */ -static int x509_get_crt_ext( unsigned char **p, - const unsigned char *end, - mbedtls_x509_crt *crt, - mbedtls_x509_crt_ext_cb_t cb, - void *p_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len; - unsigned char *end_ext_data, *start_ext_octet, *end_ext_octet; - - if( *p == end ) - return( 0 ); - - if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 ) - return( ret ); - - end = crt->v3_ext.p + crt->v3_ext.len; - while( *p < end ) - { - /* - * Extension ::= SEQUENCE { - * extnID OBJECT IDENTIFIER, - * critical BOOLEAN DEFAULT FALSE, - * extnValue OCTET STRING } - */ - mbedtls_x509_buf extn_oid = {0, 0, NULL}; - int is_critical = 0; /* DEFAULT FALSE */ - int ext_type = 0; - - if( ( ret = mbedtls_asn1_get_tag( p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - end_ext_data = *p + len; - - /* Get extension ID */ - if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len, - MBEDTLS_ASN1_OID ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - extn_oid.tag = MBEDTLS_ASN1_OID; - extn_oid.p = *p; - *p += extn_oid.len; - - /* Get optional critical */ - if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 && - ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - /* Data should be octet string type */ - if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len, - MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - start_ext_octet = *p; - end_ext_octet = *p + len; - - if( end_ext_octet != end_ext_data ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - /* - * Detect supported extensions - */ - ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type ); - - if( ret != 0 ) - { - /* Give the callback (if any) a chance to handle the extension */ - if( cb != NULL ) - { - ret = cb( p_ctx, crt, &extn_oid, is_critical, *p, end_ext_octet ); - if( ret != 0 && is_critical ) - return( ret ); - *p = end_ext_octet; - continue; - } - - /* No parser found, skip extension */ - *p = end_ext_octet; - -#if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION) - if( is_critical ) - { - /* Data is marked as critical: fail */ - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ); - } -#endif - continue; - } - - /* Forbid repeated extensions */ - if( ( crt->ext_types & ext_type ) != 0 ) - return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); - - crt->ext_types |= ext_type; - - switch( ext_type ) - { - case MBEDTLS_X509_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 MBEDTLS_X509_EXT_KEY_USAGE: - /* Parse key usage */ - if( ( ret = x509_get_key_usage( p, end_ext_octet, - &crt->key_usage ) ) != 0 ) - return( ret ); - break; - - case MBEDTLS_X509_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 MBEDTLS_X509_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 MBEDTLS_X509_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; - - case MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES: - /* Parse certificate policies type */ - if( ( ret = x509_get_certificate_policies( p, end_ext_octet, - &crt->certificate_policies ) ) != 0 ) - { - /* Give the callback (if any) a chance to handle the extension - * if it contains unsupported policies */ - if( ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE && cb != NULL && - cb( p_ctx, crt, &extn_oid, is_critical, - start_ext_octet, end_ext_octet ) == 0 ) - break; - -#if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION) - if( is_critical ) - return( ret ); - else -#endif - /* - * If MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE is returned, then we - * cannot interpret or enforce the policy. However, it is up to - * the user to choose how to enforce the policies, - * unless the extension is critical. - */ - if( ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ) - return( ret ); - } - break; - - default: - /* - * If this is a non-critical extension, which the oid layer - * supports, but there isn't an x509 parser for it, - * skip the extension. - */ -#if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION) - if( is_critical ) - return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ); - else -#endif - *p = end_ext_octet; - } - } - - if( *p != end ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - - return( 0 ); -} - -/* - * Parse and fill a single X.509 certificate in DER format - */ -static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, - const unsigned char *buf, - size_t buflen, - int make_copy, - mbedtls_x509_crt_ext_cb_t cb, - void *p_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len; - unsigned char *p, *end, *crt_end; - mbedtls_x509_buf sig_params1, sig_params2, sig_oid2; - - memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) ); - memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) ); - memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) ); - - /* - * Check for valid input - */ - if( crt == NULL || buf == NULL ) - return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); - - /* Use the original buffer until we figure out actual length. */ - p = (unsigned char*) buf; - len = buflen; - end = p + len; - - /* - * Certificate ::= SEQUENCE { - * tbsCertificate TBSCertificate, - * signatureAlgorithm AlgorithmIdentifier, - * signatureValue BIT STRING } - */ - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( MBEDTLS_ERR_X509_INVALID_FORMAT ); - } - - end = crt_end = p + len; - crt->raw.len = crt_end - buf; - if( make_copy != 0 ) - { - /* Create and populate a new buffer for the raw field. */ - crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len ); - if( crt->raw.p == NULL ) - return( MBEDTLS_ERR_X509_ALLOC_FAILED ); - - memcpy( crt->raw.p, buf, crt->raw.len ); - crt->own_buffer = 1; - - p += crt->raw.len - len; - end = crt_end = p + len; - } - else - { - crt->raw.p = (unsigned char*) buf; - crt->own_buffer = 0; - } - - /* - * TBSCertificate ::= SEQUENCE { - */ - crt->tbs.p = p; - - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( MBEDTLS_ERROR_ADD( MBEDTLS_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 = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 || - ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid, - &sig_params1 ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - - if( crt->version < 0 || crt->version > 2 ) - { - mbedtls_x509_crt_free( crt ); - return( MBEDTLS_ERR_X509_UNKNOWN_VERSION ); - } - - crt->version++; - - if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1, - &crt->sig_md, &crt->sig_pk, - &crt->sig_opts ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - - /* - * issuer Name - */ - crt->issuer_raw.p = p; - - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) ); - } - - if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 ) - { - mbedtls_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 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - - /* - * subject Name - */ - crt->subject_raw.p = p; - - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) ); - } - - if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - - crt->subject_raw.len = p - crt->subject_raw.p; - - /* - * SubjectPublicKeyInfo - */ - crt->pk_raw.p = p; - if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - crt->pk_raw.len = p - crt->pk_raw.p; - - /* - * 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 ) - { - mbedtls_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 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - } - -#if !defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3) - if( crt->version == 3 ) -#endif - { - ret = x509_get_crt_ext( &p, end, crt, cb, p_ctx ); - if( ret != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - } - - if( p != end ) - { - mbedtls_x509_crt_free( crt ); - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - } - - end = crt_end; - - /* - * } - * -- end of TBSCertificate - * - * signatureAlgorithm AlgorithmIdentifier, - * signatureValue BIT STRING - */ - if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - - if( crt->sig_oid.len != sig_oid2.len || - memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 || - sig_params1.tag != sig_params2.tag || - sig_params1.len != sig_params2.len || - ( sig_params1.len != 0 && - memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) ) - { - mbedtls_x509_crt_free( crt ); - return( MBEDTLS_ERR_X509_SIG_MISMATCH ); - } - - if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 ) - { - mbedtls_x509_crt_free( crt ); - return( ret ); - } - - if( p != end ) - { - mbedtls_x509_crt_free( crt ); - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - } - - return( 0 ); -} - -/* - * Parse one X.509 certificate in DER format from a buffer and add them to a - * chained list - */ -static int mbedtls_x509_crt_parse_der_internal( mbedtls_x509_crt *chain, - const unsigned char *buf, - size_t buflen, - int make_copy, - mbedtls_x509_crt_ext_cb_t cb, - void *p_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_x509_crt *crt = chain, *prev = NULL; - - /* - * Check for valid input - */ - if( crt == NULL || buf == NULL ) - return( MBEDTLS_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 = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); - - if( crt->next == NULL ) - return( MBEDTLS_ERR_X509_ALLOC_FAILED ); - - prev = crt; - mbedtls_x509_crt_init( crt->next ); - crt = crt->next; - } - - ret = x509_crt_parse_der_core( crt, buf, buflen, make_copy, cb, p_ctx ); - if( ret != 0 ) - { - if( prev ) - prev->next = NULL; - - if( crt != chain ) - mbedtls_free( crt ); - - return( ret ); - } - - return( 0 ); -} - -int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain, - const unsigned char *buf, - size_t buflen ) -{ - return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 0, NULL, NULL ) ); -} - -int mbedtls_x509_crt_parse_der_with_ext_cb( mbedtls_x509_crt *chain, - const unsigned char *buf, - size_t buflen, - int make_copy, - mbedtls_x509_crt_ext_cb_t cb, - void *p_ctx ) -{ - return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, make_copy, cb, p_ctx ) ); -} - -int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, - const unsigned char *buf, - size_t buflen ) -{ - return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 1, NULL, NULL ) ); -} - -/* - * Parse one or more PEM certificates from a buffer and add them to the chained - * list - */ -int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, - const unsigned char *buf, - size_t buflen ) -{ -#if defined(MBEDTLS_PEM_PARSE_C) - int success = 0, first_error = 0, total_failed = 0; - int buf_format = MBEDTLS_X509_FORMAT_DER; -#endif - - /* - * Check for valid input - */ - if( chain == NULL || buf == NULL ) - return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); - - /* - * Determine buffer content. Buffer contains either one DER certificate or - * one or more PEM certificates. - */ -#if defined(MBEDTLS_PEM_PARSE_C) - if( buflen != 0 && buf[buflen - 1] == '\0' && - strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL ) - { - buf_format = MBEDTLS_X509_FORMAT_PEM; - } - - if( buf_format == MBEDTLS_X509_FORMAT_DER ) - return mbedtls_x509_crt_parse_der( chain, buf, buflen ); -#else - return mbedtls_x509_crt_parse_der( chain, buf, buflen ); -#endif - -#if defined(MBEDTLS_PEM_PARSE_C) - if( buf_format == MBEDTLS_X509_FORMAT_PEM ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_pem_context pem; - - /* 1 rather than 0 since the terminating NULL byte is counted in */ - while( buflen > 1 ) - { - size_t use_len; - mbedtls_pem_init( &pem ); - - /* If we get there, we know the string is null-terminated */ - ret = mbedtls_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 == MBEDTLS_ERR_PEM_BAD_INPUT_DATA ) - { - return( ret ); - } - else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT ) - { - mbedtls_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 = mbedtls_x509_crt_parse_der( chain, pem.buf, pem.buflen ); - - mbedtls_pem_free( &pem ); - - if( ret != 0 ) - { - /* - * Quit parsing on a memory error - */ - if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED ) - return( ret ); - - if( first_error == 0 ) - first_error = ret; - - total_failed++; - continue; - } - - success = 1; - } - } - - if( success ) - return( total_failed ); - else if( first_error ) - return( first_error ); - else - return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT ); -#endif /* MBEDTLS_PEM_PARSE_C */ -} - -#if defined(MBEDTLS_FS_IO) -/* - * Load one or more certificates and add them to the chained list - */ -int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t n; - unsigned char *buf; - - if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 ) - return( ret ); - - ret = mbedtls_x509_crt_parse( chain, buf, n ); - - mbedtls_platform_zeroize( buf, n ); - mbedtls_free( buf ); - - return( ret ); -} - -int mbedtls_x509_crt_parse_path( mbedtls_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; - size_t len = strlen( path ); - - WIN32_FIND_DATAW file_data; - HANDLE hFind; - - if( len > MAX_PATH - 3 ) - return( MBEDTLS_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, (int)len, szDir, - MAX_PATH - 3 ); - if( w_ret == 0 ) - return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); - - hFind = FindFirstFileW( szDir, &file_data ); - if( hFind == INVALID_HANDLE_VALUE ) - return( MBEDTLS_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, (int) len - 1, - NULL, NULL ); - if( w_ret == 0 ) - { - ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; - goto cleanup; - } - - w_ret = mbedtls_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 = MBEDTLS_ERR_X509_FILE_IO_ERROR; - -cleanup: - FindClose( hFind ); -#else /* _WIN32 */ - int t_ret; - int snp_ret; - struct stat sb; - struct dirent *entry; - char entry_name[MBEDTLS_X509_MAX_FILE_PATH_LEN]; - DIR *dir = opendir( path ); - - if( dir == NULL ) - return( MBEDTLS_ERR_X509_FILE_IO_ERROR ); - -#if defined(MBEDTLS_THREADING_C) - if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 ) - { - closedir( dir ); - return( ret ); - } -#endif /* MBEDTLS_THREADING_C */ - - memset( &sb, 0, sizeof( sb ) ); - - while( ( entry = readdir( dir ) ) != NULL ) - { - snp_ret = mbedtls_snprintf( entry_name, sizeof entry_name, - "%s/%s", path, entry->d_name ); - - if( snp_ret < 0 || (size_t)snp_ret >= sizeof entry_name ) - { - ret = MBEDTLS_ERR_X509_BUFFER_TOO_SMALL; - goto cleanup; - } - else if( stat( entry_name, &sb ) == -1 ) - { - ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; - goto cleanup; - } - - if( !S_ISREG( sb.st_mode ) ) - continue; - - // Ignore parse errors - // - t_ret = mbedtls_x509_crt_parse_file( chain, entry_name ); - if( t_ret < 0 ) - ret++; - else - ret += t_ret; - } - -cleanup: - closedir( dir ); - -#if defined(MBEDTLS_THREADING_C) - if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 ) - ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR; -#endif /* MBEDTLS_THREADING_C */ - -#endif /* _WIN32 */ - - return( ret ); -} -#endif /* MBEDTLS_FS_IO */ - -/* - * OtherName ::= SEQUENCE { - * type-id OBJECT IDENTIFIER, - * value [0] EXPLICIT ANY DEFINED BY type-id } - * - * HardwareModuleName ::= SEQUENCE { - * hwType OBJECT IDENTIFIER, - * hwSerialNum OCTET STRING } - * - * NOTE: we currently only parse and use otherName of type HwModuleName, - * as defined in RFC 4108. - */ -static int x509_get_other_name( const mbedtls_x509_buf *subject_alt_name, - mbedtls_x509_san_other_name *other_name ) -{ - int ret = 0; - size_t len; - unsigned char *p = subject_alt_name->p; - const unsigned char *end = p + subject_alt_name->len; - mbedtls_x509_buf cur_oid; - - if( ( subject_alt_name->tag & - ( MBEDTLS_ASN1_TAG_CLASS_MASK | MBEDTLS_ASN1_TAG_VALUE_MASK ) ) != - ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME ) ) - { - /* - * The given subject alternative name is not of type "othername". - */ - return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); - } - - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, - MBEDTLS_ASN1_OID ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - cur_oid.tag = MBEDTLS_ASN1_OID; - cur_oid.p = p; - cur_oid.len = len; - - /* - * Only HwModuleName is currently supported. - */ - if( MBEDTLS_OID_CMP( MBEDTLS_OID_ON_HW_MODULE_NAME, &cur_oid ) != 0 ) - { - return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ); - } - - if( p + len >= end ) - { - mbedtls_platform_zeroize( other_name, sizeof( *other_name ) ); - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - } - p += len; - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, - MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OID ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - other_name->value.hardware_module_name.oid.tag = MBEDTLS_ASN1_OID; - other_name->value.hardware_module_name.oid.p = p; - other_name->value.hardware_module_name.oid.len = len; - - if( p + len >= end ) - { - mbedtls_platform_zeroize( other_name, sizeof( *other_name ) ); - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - } - p += len; - if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, - MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) ); - - other_name->value.hardware_module_name.val.tag = MBEDTLS_ASN1_OCTET_STRING; - other_name->value.hardware_module_name.val.p = p; - other_name->value.hardware_module_name.val.len = len; - p += len; - if( p != end ) - { - mbedtls_platform_zeroize( other_name, - sizeof( *other_name ) ); - return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, - MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) ); - } - return( 0 ); -} - -static int x509_info_subject_alt_name( char **buf, size_t *size, - const mbedtls_x509_sequence - *subject_alt_name, - const char *prefix ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t n = *size; - char *p = *buf; - const mbedtls_x509_sequence *cur = subject_alt_name; - mbedtls_x509_subject_alternative_name san; - int parse_ret; - - while( cur != NULL ) - { - memset( &san, 0, sizeof( san ) ); - parse_ret = mbedtls_x509_parse_subject_alt_name( &cur->buf, &san ); - if( parse_ret != 0 ) - { - if( parse_ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ) - { - ret = mbedtls_snprintf( p, n, "\n%s ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - } - else - { - ret = mbedtls_snprintf( p, n, "\n%s ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - } - cur = cur->next; - continue; - } - - switch( san.type ) - { - /* - * otherName - */ - case MBEDTLS_X509_SAN_OTHER_NAME: - { - mbedtls_x509_san_other_name *other_name = &san.san.other_name; - - ret = mbedtls_snprintf( p, n, "\n%s otherName :", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - if( MBEDTLS_OID_CMP( MBEDTLS_OID_ON_HW_MODULE_NAME, - &other_name->value.hardware_module_name.oid ) != 0 ) - { - ret = mbedtls_snprintf( p, n, "\n%s hardware module name :", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - ret = mbedtls_snprintf( p, n, "\n%s hardware type : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_oid_get_numeric_string( p, n, &other_name->value.hardware_module_name.oid ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_snprintf( p, n, "\n%s hardware serial number : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - if( other_name->value.hardware_module_name.val.len >= n ) - { - *p = '\0'; - return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); - } - - memcpy( p, other_name->value.hardware_module_name.val.p, - other_name->value.hardware_module_name.val.len ); - p += other_name->value.hardware_module_name.val.len; - - n -= other_name->value.hardware_module_name.val.len; - - }/* MBEDTLS_OID_ON_HW_MODULE_NAME */ - } - break; - - /* - * dNSName - */ - case MBEDTLS_X509_SAN_DNS_NAME: - { - ret = mbedtls_snprintf( p, n, "\n%s dNSName : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - if( san.san.unstructured_name.len >= n ) - { - *p = '\0'; - return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); - } - - memcpy( p, san.san.unstructured_name.p, san.san.unstructured_name.len ); - p += san.san.unstructured_name.len; - n -= san.san.unstructured_name.len; - } - break; - - /* - * Type not supported, skip item. - */ - default: - ret = mbedtls_snprintf( p, n, "\n%s ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - break; - } - - cur = cur->next; - } - - *p = '\0'; - - *size = n; - *buf = p; - - return( 0 ); -} - -int mbedtls_x509_parse_subject_alt_name( const mbedtls_x509_buf *san_buf, - mbedtls_x509_subject_alternative_name *san ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - switch( san_buf->tag & - ( MBEDTLS_ASN1_TAG_CLASS_MASK | - MBEDTLS_ASN1_TAG_VALUE_MASK ) ) - { - /* - * otherName - */ - case( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME ): - { - mbedtls_x509_san_other_name other_name; - - ret = x509_get_other_name( san_buf, &other_name ); - if( ret != 0 ) - return( ret ); - - memset( san, 0, sizeof( mbedtls_x509_subject_alternative_name ) ); - san->type = MBEDTLS_X509_SAN_OTHER_NAME; - memcpy( &san->san.other_name, - &other_name, sizeof( other_name ) ); - - } - break; - - /* - * dNSName - */ - case( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_DNS_NAME ): - { - memset( san, 0, sizeof( mbedtls_x509_subject_alternative_name ) ); - san->type = MBEDTLS_X509_SAN_DNS_NAME; - - memcpy( &san->san.unstructured_name, - san_buf, sizeof( *san_buf ) ); - - } - break; - - /* - * Type not supported - */ - default: - return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ); - } - return( 0 ); -} - -#define PRINT_ITEM(i) \ - { \ - ret = mbedtls_snprintf( p, n, "%s" i, sep ); \ - MBEDTLS_X509_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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t n = *size; - char *p = *buf; - const char *sep = ""; - - CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" ); - CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" ); - CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" ); - CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" ); - CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" ); - CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" ); - CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" ); - CERT_TYPE( MBEDTLS_X509_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 int key_usage ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t n = *size; - char *p = *buf; - const char *sep = ""; - - KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" ); - KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" ); - KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" ); - KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" ); - KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" ); - KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" ); - KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" ); - KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" ); - KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" ); - - *size = n; - *buf = p; - - return( 0 ); -} - -static int x509_info_ext_key_usage( char **buf, size_t *size, - const mbedtls_x509_sequence *extended_key_usage ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const char *desc; - size_t n = *size; - char *p = *buf; - const mbedtls_x509_sequence *cur = extended_key_usage; - const char *sep = ""; - - while( cur != NULL ) - { - if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 ) - desc = "???"; - - ret = mbedtls_snprintf( p, n, "%s%s", sep, desc ); - MBEDTLS_X509_SAFE_SNPRINTF; - - sep = ", "; - - cur = cur->next; - } - - *size = n; - *buf = p; - - return( 0 ); -} - -static int x509_info_cert_policies( char **buf, size_t *size, - const mbedtls_x509_sequence *certificate_policies ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const char *desc; - size_t n = *size; - char *p = *buf; - const mbedtls_x509_sequence *cur = certificate_policies; - const char *sep = ""; - - while( cur != NULL ) - { - if( mbedtls_oid_get_certificate_policies( &cur->buf, &desc ) != 0 ) - desc = "???"; - - ret = mbedtls_snprintf( p, n, "%s%s", sep, desc ); - MBEDTLS_X509_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 mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix, - const mbedtls_x509_crt *crt ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t n; - char *p; - char key_size_str[BEFORE_COLON]; - - p = buf; - n = size; - - if( NULL == crt ) - { - ret = mbedtls_snprintf( p, n, "\nCertificate is uninitialised!\n" ); - MBEDTLS_X509_SAFE_SNPRINTF; - - return( (int) ( size - n ) ); - } - - ret = mbedtls_snprintf( p, n, "%scert. version : %d\n", - prefix, crt->version ); - MBEDTLS_X509_SAFE_SNPRINTF; - ret = mbedtls_snprintf( p, n, "%sserial number : ", - prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_x509_serial_gets( p, n, &crt->serial ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - ret = mbedtls_x509_dn_gets( p, n, &crt->issuer ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - ret = mbedtls_x509_dn_gets( p, n, &crt->subject ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_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 ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_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 ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - ret = mbedtls_x509_sig_alg_gets( p, n, &crt->sig_oid, crt->sig_pk, - crt->sig_md, crt->sig_opts ); - MBEDTLS_X509_SAFE_SNPRINTF; - - /* Key size */ - if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON, - mbedtls_pk_get_name( &crt->pk ) ) ) != 0 ) - { - return( ret ); - } - - ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str, - (int) mbedtls_pk_get_bitlen( &crt->pk ) ); - MBEDTLS_X509_SAFE_SNPRINTF; - - /* - * Optional extensions - */ - - if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS ) - { - ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix, - crt->ca_istrue ? "true" : "false" ); - MBEDTLS_X509_SAFE_SNPRINTF; - - if( crt->max_pathlen > 0 ) - { - ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 ); - MBEDTLS_X509_SAFE_SNPRINTF; - } - } - - if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME ) - { - ret = mbedtls_snprintf( p, n, "\n%ssubject alt name :", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - if( ( ret = x509_info_subject_alt_name( &p, &n, - &crt->subject_alt_names, - prefix ) ) != 0 ) - return( ret ); - } - - if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE ) - { - ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 ) - return( ret ); - } - - if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) - { - ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 ) - return( ret ); - } - - if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) - { - ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - if( ( ret = x509_info_ext_key_usage( &p, &n, - &crt->ext_key_usage ) ) != 0 ) - return( ret ); - } - - if( crt->ext_types & MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES ) - { - ret = mbedtls_snprintf( p, n, "\n%scertificate policies : ", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - - if( ( ret = x509_info_cert_policies( &p, &n, - &crt->certificate_policies ) ) != 0 ) - return( ret ); - } - - ret = mbedtls_snprintf( p, n, "\n" ); - MBEDTLS_X509_SAFE_SNPRINTF; - - return( (int) ( size - n ) ); -} - -struct x509_crt_verify_string { - int code; - const char *string; -}; - -static const struct x509_crt_verify_string x509_crt_verify_strings[] = { - { MBEDTLS_X509_BADCERT_EXPIRED, "The certificate validity has expired" }, - { MBEDTLS_X509_BADCERT_REVOKED, "The certificate has been revoked (is on a CRL)" }, - { MBEDTLS_X509_BADCERT_CN_MISMATCH, "The certificate Common Name (CN) does not match with the expected CN" }, - { MBEDTLS_X509_BADCERT_NOT_TRUSTED, "The certificate is not correctly signed by the trusted CA" }, - { MBEDTLS_X509_BADCRL_NOT_TRUSTED, "The CRL is not correctly signed by the trusted CA" }, - { MBEDTLS_X509_BADCRL_EXPIRED, "The CRL is expired" }, - { MBEDTLS_X509_BADCERT_MISSING, "Certificate was missing" }, - { MBEDTLS_X509_BADCERT_SKIP_VERIFY, "Certificate verification was skipped" }, - { MBEDTLS_X509_BADCERT_OTHER, "Other reason (can be used by verify callback)" }, - { MBEDTLS_X509_BADCERT_FUTURE, "The certificate validity starts in the future" }, - { MBEDTLS_X509_BADCRL_FUTURE, "The CRL is from the future" }, - { MBEDTLS_X509_BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" }, - { MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" }, - { MBEDTLS_X509_BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" }, - { MBEDTLS_X509_BADCERT_BAD_MD, "The certificate is signed with an unacceptable hash." }, - { MBEDTLS_X509_BADCERT_BAD_PK, "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." }, - { MBEDTLS_X509_BADCERT_BAD_KEY, "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." }, - { MBEDTLS_X509_BADCRL_BAD_MD, "The CRL is signed with an unacceptable hash." }, - { MBEDTLS_X509_BADCRL_BAD_PK, "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." }, - { MBEDTLS_X509_BADCRL_BAD_KEY, "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." }, - { 0, NULL } -}; - -int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix, - uint32_t flags ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const struct x509_crt_verify_string *cur; - char *p = buf; - size_t n = size; - - for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ ) - { - if( ( flags & cur->code ) == 0 ) - continue; - - ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string ); - MBEDTLS_X509_SAFE_SNPRINTF; - flags ^= cur->code; - } - - if( flags != 0 ) - { - ret = mbedtls_snprintf( p, n, "%sUnknown reason " - "(this should not happen)\n", prefix ); - MBEDTLS_X509_SAFE_SNPRINTF; - } - - return( (int) ( size - n ) ); -} - -#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) -int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt, - unsigned int usage ) -{ - unsigned int usage_must, usage_may; - unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY - | MBEDTLS_X509_KU_DECIPHER_ONLY; - - if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 ) - return( 0 ); - - usage_must = usage & ~may_mask; - - if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must ) - return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); - - usage_may = usage & may_mask; - - if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may ) - return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); - - return( 0 ); -} -#endif - -#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) -int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt, - const char *usage_oid, - size_t usage_len ) -{ - const mbedtls_x509_sequence *cur; - - /* Extension is not mandatory, absent means no restriction */ - if( ( crt->ext_types & MBEDTLS_X509_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 mbedtls_x509_buf *cur_oid = &cur->buf; - - if( cur_oid->len == usage_len && - memcmp( cur_oid->p, usage_oid, usage_len ) == 0 ) - { - return( 0 ); - } - - if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) == 0 ) - return( 0 ); - } - - return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); -} -#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ - -#if defined(MBEDTLS_X509_CRL_PARSE_C) -/* - * Return 1 if the certificate is revoked, or 0 otherwise. - */ -int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl ) -{ - const mbedtls_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 ) - { - return( 1 ); - } - - cur = cur->next; - } - - return( 0 ); -} - -/* - * Check that the given certificate is not revoked according to the CRL. - * Skip validation if no CRL for the given CA is present. - */ -static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca, - mbedtls_x509_crl *crl_list, - const mbedtls_x509_crt_profile *profile ) -{ - int flags = 0; - unsigned char hash[MBEDTLS_MD_MAX_SIZE]; - const mbedtls_md_info_t *md_info; - - if( ca == NULL ) - return( flags ); - - while( crl_list != NULL ) - { - if( crl_list->version == 0 || - x509_name_cmp( &crl_list->issuer, &ca->subject ) != 0 ) - { - crl_list = crl_list->next; - continue; - } - - /* - * Check if the CA is configured to sign CRLs - */ -#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) - if( mbedtls_x509_crt_check_key_usage( ca, - MBEDTLS_X509_KU_CRL_SIGN ) != 0 ) - { - flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; - break; - } -#endif - - /* - * Check if CRL is correctly signed by the trusted CA - */ - if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 ) - flags |= MBEDTLS_X509_BADCRL_BAD_MD; - - if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 ) - flags |= MBEDTLS_X509_BADCRL_BAD_PK; - - md_info = mbedtls_md_info_from_type( crl_list->sig_md ); - if( mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash ) != 0 ) - { - /* Note: this can't happen except after an internal error */ - flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; - break; - } - - if( x509_profile_check_key( profile, &ca->pk ) != 0 ) - flags |= MBEDTLS_X509_BADCERT_BAD_KEY; - - if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk, - crl_list->sig_md, hash, mbedtls_md_get_size( md_info ), - crl_list->sig.p, crl_list->sig.len ) != 0 ) - { - flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; - break; - } - - /* - * Check for validity of CRL (Do not drop out) - */ - if( mbedtls_x509_time_is_past( &crl_list->next_update ) ) - flags |= MBEDTLS_X509_BADCRL_EXPIRED; - - if( mbedtls_x509_time_is_future( &crl_list->this_update ) ) - flags |= MBEDTLS_X509_BADCRL_FUTURE; - - /* - * Check if certificate is revoked - */ - if( mbedtls_x509_crt_is_revoked( crt, crl_list ) ) - { - flags |= MBEDTLS_X509_BADCERT_REVOKED; - break; - } - - crl_list = crl_list->next; - } - - return( flags ); -} -#endif /* MBEDTLS_X509_CRL_PARSE_C */ - -/* - * Check the signature of a certificate by its parent - */ -static int x509_crt_check_signature( const mbedtls_x509_crt *child, - mbedtls_x509_crt *parent, - mbedtls_x509_crt_restart_ctx *rs_ctx ) -{ - unsigned char hash[MBEDTLS_MD_MAX_SIZE]; - size_t hash_len; -#if !defined(MBEDTLS_USE_PSA_CRYPTO) - const mbedtls_md_info_t *md_info; - md_info = mbedtls_md_info_from_type( child->sig_md ); - hash_len = mbedtls_md_get_size( md_info ); - - /* Note: hash errors can happen only after an internal error */ - if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 ) - return( -1 ); -#else - psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT; - psa_algorithm_t hash_alg = mbedtls_psa_translate_md( child->sig_md ); - - if( psa_hash_setup( &hash_operation, hash_alg ) != PSA_SUCCESS ) - return( -1 ); - - if( psa_hash_update( &hash_operation, child->tbs.p, child->tbs.len ) - != PSA_SUCCESS ) - { - return( -1 ); - } - - if( psa_hash_finish( &hash_operation, hash, sizeof( hash ), &hash_len ) - != PSA_SUCCESS ) - { - return( -1 ); - } -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - /* Skip expensive computation on obvious mismatch */ - if( ! mbedtls_pk_can_do( &parent->pk, child->sig_pk ) ) - return( -1 ); - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - if( rs_ctx != NULL && child->sig_pk == MBEDTLS_PK_ECDSA ) - { - return( mbedtls_pk_verify_restartable( &parent->pk, - child->sig_md, hash, hash_len, - child->sig.p, child->sig.len, &rs_ctx->pk ) ); - } -#else - (void) rs_ctx; -#endif - - return( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk, - child->sig_md, hash, hash_len, - child->sig.p, child->sig.len ) ); -} - -/* - * 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 - */ -static int x509_crt_check_parent( const mbedtls_x509_crt *child, - const mbedtls_x509_crt *parent, - int top ) -{ - 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; - - if( need_ca_bit && ! parent->ca_istrue ) - return( -1 ); - -#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) - if( need_ca_bit && - mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 ) - { - return( -1 ); - } -#endif - - return( 0 ); -} - -/* - * Find a suitable parent for child in candidates, or return NULL. - * - * Here suitable is defined as: - * 1. subject name matches child's issuer - * 2. if necessary, the CA bit is set and key usage allows signing certs - * 3. for trusted roots, the signature is correct - * (for intermediates, the signature is checked and the result reported) - * 4. pathlen constraints are satisfied - * - * If there's a suitable candidate which is also time-valid, return the first - * such. Otherwise, return the first suitable candidate (or NULL if there is - * none). - * - * The rationale for this rule is that someone could have a list of trusted - * roots with two versions on the same root with different validity periods. - * (At least one user reported having such a list and wanted it to just work.) - * The reason we don't just require time-validity is that generally there is - * only one version, and if it's expired we want the flags to state that - * rather than NOT_TRUSTED, as would be the case if we required it here. - * - * The rationale for rule 3 (signature for trusted roots) is that users might - * have two versions of the same CA with different keys in their list, and the - * way we select the correct one is by checking the signature (as we don't - * rely on key identifier extensions). (This is one way users might choose to - * handle key rollover, another relies on self-issued certs, see [SIRO].) - * - * Arguments: - * - [in] child: certificate for which we're looking for a parent - * - [in] candidates: chained list of potential parents - * - [out] r_parent: parent found (or NULL) - * - [out] r_signature_is_good: 1 if child signature by parent is valid, or 0 - * - [in] top: 1 if candidates consists of trusted roots, ie we're at the top - * of the chain, 0 otherwise - * - [in] path_cnt: number of intermediates seen so far - * - [in] self_cnt: number of self-signed intermediates seen so far - * (will never be greater than path_cnt) - * - [in-out] rs_ctx: context for restarting operations - * - * Return value: - * - 0 on success - * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise - */ -static int x509_crt_find_parent_in( - mbedtls_x509_crt *child, - mbedtls_x509_crt *candidates, - mbedtls_x509_crt **r_parent, - int *r_signature_is_good, - int top, - unsigned path_cnt, - unsigned self_cnt, - mbedtls_x509_crt_restart_ctx *rs_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_x509_crt *parent, *fallback_parent; - int signature_is_good = 0, fallback_signature_is_good; - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - /* did we have something in progress? */ - if( rs_ctx != NULL && rs_ctx->parent != NULL ) - { - /* restore saved state */ - parent = rs_ctx->parent; - fallback_parent = rs_ctx->fallback_parent; - fallback_signature_is_good = rs_ctx->fallback_signature_is_good; - - /* clear saved state */ - rs_ctx->parent = NULL; - rs_ctx->fallback_parent = NULL; - rs_ctx->fallback_signature_is_good = 0; - - /* resume where we left */ - goto check_signature; - } -#endif - - fallback_parent = NULL; - fallback_signature_is_good = 0; - - for( parent = candidates; parent != NULL; parent = parent->next ) - { - /* basic parenting skills (name, CA bit, key usage) */ - if( x509_crt_check_parent( child, parent, top ) != 0 ) - continue; - - /* +1 because stored max_pathlen is 1 higher that the actual value */ - if( parent->max_pathlen > 0 && - (size_t) parent->max_pathlen < 1 + path_cnt - self_cnt ) - { - continue; - } - - /* Signature */ -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) -check_signature: -#endif - ret = x509_crt_check_signature( child, parent, rs_ctx ); - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - { - /* save state */ - rs_ctx->parent = parent; - rs_ctx->fallback_parent = fallback_parent; - rs_ctx->fallback_signature_is_good = fallback_signature_is_good; - - return( ret ); - } -#else - (void) ret; -#endif - - signature_is_good = ret == 0; - if( top && ! signature_is_good ) - continue; - - /* optional time check */ - if( mbedtls_x509_time_is_past( &parent->valid_to ) || - mbedtls_x509_time_is_future( &parent->valid_from ) ) - { - if( fallback_parent == NULL ) - { - fallback_parent = parent; - fallback_signature_is_good = signature_is_good; - } - - continue; - } - - *r_parent = parent; - *r_signature_is_good = signature_is_good; - - break; - } - - if( parent == NULL ) - { - *r_parent = fallback_parent; - *r_signature_is_good = fallback_signature_is_good; - } - - return( 0 ); -} - -/* - * Find a parent in trusted CAs or the provided chain, or return NULL. - * - * Searches in trusted CAs first, and return the first suitable parent found - * (see find_parent_in() for definition of suitable). - * - * Arguments: - * - [in] child: certificate for which we're looking for a parent, followed - * by a chain of possible intermediates - * - [in] trust_ca: list of locally trusted certificates - * - [out] parent: parent found (or NULL) - * - [out] parent_is_trusted: 1 if returned `parent` is trusted, or 0 - * - [out] signature_is_good: 1 if child signature by parent is valid, or 0 - * - [in] path_cnt: number of links in the chain so far (EE -> ... -> child) - * - [in] self_cnt: number of self-signed certs in the chain so far - * (will always be no greater than path_cnt) - * - [in-out] rs_ctx: context for restarting operations - * - * Return value: - * - 0 on success - * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise - */ -static int x509_crt_find_parent( - mbedtls_x509_crt *child, - mbedtls_x509_crt *trust_ca, - mbedtls_x509_crt **parent, - int *parent_is_trusted, - int *signature_is_good, - unsigned path_cnt, - unsigned self_cnt, - mbedtls_x509_crt_restart_ctx *rs_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_x509_crt *search_list; - - *parent_is_trusted = 1; - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - /* restore then clear saved state if we have some stored */ - if( rs_ctx != NULL && rs_ctx->parent_is_trusted != -1 ) - { - *parent_is_trusted = rs_ctx->parent_is_trusted; - rs_ctx->parent_is_trusted = -1; - } -#endif - - while( 1 ) { - search_list = *parent_is_trusted ? trust_ca : child->next; - - ret = x509_crt_find_parent_in( child, search_list, - parent, signature_is_good, - *parent_is_trusted, - path_cnt, self_cnt, rs_ctx ); - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - { - /* save state */ - rs_ctx->parent_is_trusted = *parent_is_trusted; - return( ret ); - } -#else - (void) ret; -#endif - - /* stop here if found or already in second iteration */ - if( *parent != NULL || *parent_is_trusted == 0 ) - break; - - /* prepare second iteration */ - *parent_is_trusted = 0; - } - - /* extra precaution against mistakes in the caller */ - if( *parent == NULL ) - { - *parent_is_trusted = 0; - *signature_is_good = 0; - } - - return( 0 ); -} - -/* - * Check if an end-entity certificate is locally trusted - * - * Currently we require such certificates to be self-signed (actually only - * check for self-issued as self-signatures are not checked) - */ -static int x509_crt_check_ee_locally_trusted( - mbedtls_x509_crt *crt, - mbedtls_x509_crt *trust_ca ) -{ - mbedtls_x509_crt *cur; - - /* must be self-issued */ - if( x509_name_cmp( &crt->issuer, &crt->subject ) != 0 ) - return( -1 ); - - /* look for an exact match with trusted cert */ - for( cur = trust_ca; cur != NULL; cur = cur->next ) - { - if( crt->raw.len == cur->raw.len && - memcmp( crt->raw.p, cur->raw.p, crt->raw.len ) == 0 ) - { - return( 0 ); - } - } - - /* too bad */ - return( -1 ); -} - -/* - * Build and verify a certificate chain - * - * Given a peer-provided list of certificates EE, C1, ..., Cn and - * a list of trusted certs R1, ... Rp, try to build and verify a chain - * EE, Ci1, ... Ciq [, Rj] - * such that every cert in the chain is a child of the next one, - * jumping to a trusted root as early as possible. - * - * Verify that chain and return it with flags for all issues found. - * - * Special cases: - * - EE == Rj -> return a one-element list containing it - * - EE, Ci1, ..., Ciq cannot be continued with a trusted root - * -> return that chain with NOT_TRUSTED set on Ciq - * - * Tests for (aspects of) this function should include at least: - * - trusted EE - * - EE -> trusted root - * - EE -> intermediate CA -> trusted root - * - if relevant: EE untrusted - * - if relevant: EE -> intermediate, untrusted - * with the aspect under test checked at each relevant level (EE, int, root). - * For some aspects longer chains are required, but usually length 2 is - * enough (but length 1 is not in general). - * - * Arguments: - * - [in] crt: the cert list EE, C1, ..., Cn - * - [in] trust_ca: the trusted list R1, ..., Rp - * - [in] ca_crl, profile: as in verify_with_profile() - * - [out] ver_chain: the built and verified chain - * Only valid when return value is 0, may contain garbage otherwise! - * Restart note: need not be the same when calling again to resume. - * - [in-out] rs_ctx: context for restarting operations - * - * Return value: - * - non-zero if the chain could not be fully built and examined - * - 0 is the chain was successfully built and examined, - * even if it was found to be invalid - */ -static int x509_crt_verify_chain( - mbedtls_x509_crt *crt, - mbedtls_x509_crt *trust_ca, - mbedtls_x509_crl *ca_crl, - mbedtls_x509_crt_ca_cb_t f_ca_cb, - void *p_ca_cb, - const mbedtls_x509_crt_profile *profile, - mbedtls_x509_crt_verify_chain *ver_chain, - mbedtls_x509_crt_restart_ctx *rs_ctx ) -{ - /* Don't initialize any of those variables here, so that the compiler can - * catch potential issues with jumping ahead when restarting */ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - uint32_t *flags; - mbedtls_x509_crt_verify_chain_item *cur; - mbedtls_x509_crt *child; - mbedtls_x509_crt *parent; - int parent_is_trusted; - int child_is_trusted; - int signature_is_good; - unsigned self_cnt; - mbedtls_x509_crt *cur_trust_ca = NULL; - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - /* resume if we had an operation in progress */ - if( rs_ctx != NULL && rs_ctx->in_progress == x509_crt_rs_find_parent ) - { - /* restore saved state */ - *ver_chain = rs_ctx->ver_chain; /* struct copy */ - self_cnt = rs_ctx->self_cnt; - - /* restore derived state */ - cur = &ver_chain->items[ver_chain->len - 1]; - child = cur->crt; - flags = &cur->flags; - - goto find_parent; - } -#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ - - child = crt; - self_cnt = 0; - parent_is_trusted = 0; - child_is_trusted = 0; - - while( 1 ) { - /* Add certificate to the verification chain */ - cur = &ver_chain->items[ver_chain->len]; - cur->crt = child; - cur->flags = 0; - ver_chain->len++; - flags = &cur->flags; - - /* Check time-validity (all certificates) */ - if( mbedtls_x509_time_is_past( &child->valid_to ) ) - *flags |= MBEDTLS_X509_BADCERT_EXPIRED; - - if( mbedtls_x509_time_is_future( &child->valid_from ) ) - *flags |= MBEDTLS_X509_BADCERT_FUTURE; - - /* Stop here for trusted roots (but not for trusted EE certs) */ - if( child_is_trusted ) - return( 0 ); - - /* Check signature algorithm: MD & PK algs */ - if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 ) - *flags |= MBEDTLS_X509_BADCERT_BAD_MD; - - if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 ) - *flags |= MBEDTLS_X509_BADCERT_BAD_PK; - - /* Special case: EE certs that are locally trusted */ - if( ver_chain->len == 1 && - x509_crt_check_ee_locally_trusted( child, trust_ca ) == 0 ) - { - return( 0 ); - } - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) -find_parent: -#endif - - /* Obtain list of potential trusted signers from CA callback, - * or use statically provided list. */ -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) - if( f_ca_cb != NULL ) - { - mbedtls_x509_crt_free( ver_chain->trust_ca_cb_result ); - mbedtls_free( ver_chain->trust_ca_cb_result ); - ver_chain->trust_ca_cb_result = NULL; - - ret = f_ca_cb( p_ca_cb, child, &ver_chain->trust_ca_cb_result ); - if( ret != 0 ) - return( MBEDTLS_ERR_X509_FATAL_ERROR ); - - cur_trust_ca = ver_chain->trust_ca_cb_result; - } - else -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ - { - ((void) f_ca_cb); - ((void) p_ca_cb); - cur_trust_ca = trust_ca; - } - - /* Look for a parent in trusted CAs or up the chain */ - ret = x509_crt_find_parent( child, cur_trust_ca, &parent, - &parent_is_trusted, &signature_is_good, - ver_chain->len - 1, self_cnt, rs_ctx ); - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - { - /* save state */ - rs_ctx->in_progress = x509_crt_rs_find_parent; - rs_ctx->self_cnt = self_cnt; - rs_ctx->ver_chain = *ver_chain; /* struct copy */ - - return( ret ); - } -#else - (void) ret; -#endif - - /* No parent? We're done here */ - if( parent == NULL ) - { - *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; - return( 0 ); - } - - /* Count intermediate self-issued (not necessarily self-signed) certs. - * These can occur with some strategies for key rollover, see [SIRO], - * and should be excluded from max_pathlen checks. */ - if( ver_chain->len != 1 && - x509_name_cmp( &child->issuer, &child->subject ) == 0 ) - { - self_cnt++; - } - - /* path_cnt is 0 for the first intermediate CA, - * and if parent is trusted it's not an intermediate CA */ - if( ! parent_is_trusted && - ver_chain->len > MBEDTLS_X509_MAX_INTERMEDIATE_CA ) - { - /* return immediately to avoid overflow the chain array */ - return( MBEDTLS_ERR_X509_FATAL_ERROR ); - } - - /* signature was checked while searching parent */ - if( ! signature_is_good ) - *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; - - /* check size of signing key */ - if( x509_profile_check_key( profile, &parent->pk ) != 0 ) - *flags |= MBEDTLS_X509_BADCERT_BAD_KEY; - -#if defined(MBEDTLS_X509_CRL_PARSE_C) - /* Check trusted CA's CRL for the given crt */ - *flags |= x509_crt_verifycrl( child, parent, ca_crl, profile ); -#else - (void) ca_crl; -#endif - - /* prepare for next iteration */ - child = parent; - parent = NULL; - child_is_trusted = parent_is_trusted; - signature_is_good = 0; - } -} - -/* - * Check for CN match - */ -static int x509_crt_check_cn( const mbedtls_x509_buf *name, - const char *cn, size_t cn_len ) -{ - /* try exact match */ - if( name->len == cn_len && - x509_memcasecmp( cn, name->p, cn_len ) == 0 ) - { - return( 0 ); - } - - /* try wildcard match */ - if( x509_check_wildcard( cn, name ) == 0 ) - { - return( 0 ); - } - - return( -1 ); -} - -/* - * Check for SAN match, see RFC 5280 Section 4.2.1.6 - */ -static int x509_crt_check_san( const mbedtls_x509_buf *name, - const char *cn, size_t cn_len ) -{ - const unsigned char san_type = (unsigned char) name->tag & - MBEDTLS_ASN1_TAG_VALUE_MASK; - - /* dNSName */ - if( san_type == MBEDTLS_X509_SAN_DNS_NAME ) - return( x509_crt_check_cn( name, cn, cn_len ) ); - - /* (We may handle other types here later.) */ - - /* Unrecognized type */ - return( -1 ); -} - -/* - * Verify the requested CN - only call this if cn is not NULL! - */ -static void x509_crt_verify_name( const mbedtls_x509_crt *crt, - const char *cn, - uint32_t *flags ) -{ - const mbedtls_x509_name *name; - const mbedtls_x509_sequence *cur; - size_t cn_len = strlen( cn ); - - if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME ) - { - for( cur = &crt->subject_alt_names; cur != NULL; cur = cur->next ) - { - if( x509_crt_check_san( &cur->buf, cn, cn_len ) == 0 ) - break; - } - - if( cur == NULL ) - *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH; - } - else - { - for( name = &crt->subject; name != NULL; name = name->next ) - { - if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 && - x509_crt_check_cn( &name->val, cn, cn_len ) == 0 ) - { - break; - } - } - - if( name == NULL ) - *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH; - } -} - -/* - * Merge the flags for all certs in the chain, after calling callback - */ -static int x509_crt_merge_flags_with_cb( - uint32_t *flags, - const mbedtls_x509_crt_verify_chain *ver_chain, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned i; - uint32_t cur_flags; - const mbedtls_x509_crt_verify_chain_item *cur; - - for( i = ver_chain->len; i != 0; --i ) - { - cur = &ver_chain->items[i-1]; - cur_flags = cur->flags; - - if( NULL != f_vrfy ) - if( ( ret = f_vrfy( p_vrfy, cur->crt, (int) i-1, &cur_flags ) ) != 0 ) - return( ret ); - - *flags |= cur_flags; - } - - return( 0 ); -} - -/* - * Verify the certificate validity, with profile, restartable version - * - * This function: - * - checks the requested CN (if any) - * - checks the type and size of the EE cert's key, - * as that isn't done as part of chain building/verification currently - * - builds and verifies the chain - * - then calls the callback and merges the flags - * - * The parameters pairs `trust_ca`, `ca_crl` and `f_ca_cb`, `p_ca_cb` - * are mutually exclusive: If `f_ca_cb != NULL`, it will be used by the - * verification routine to search for trusted signers, and CRLs will - * be disabled. Otherwise, `trust_ca` will be used as the static list - * of trusted signers, and `ca_crl` will be use as the static list - * of CRLs. - */ -static int x509_crt_verify_restartable_ca_cb( mbedtls_x509_crt *crt, - mbedtls_x509_crt *trust_ca, - mbedtls_x509_crl *ca_crl, - mbedtls_x509_crt_ca_cb_t f_ca_cb, - void *p_ca_cb, - const mbedtls_x509_crt_profile *profile, - const char *cn, uint32_t *flags, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy, - mbedtls_x509_crt_restart_ctx *rs_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_pk_type_t pk_type; - mbedtls_x509_crt_verify_chain ver_chain; - uint32_t ee_flags; - - *flags = 0; - ee_flags = 0; - x509_crt_verify_chain_reset( &ver_chain ); - - if( profile == NULL ) - { - ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA; - goto exit; - } - - /* check name if requested */ - if( cn != NULL ) - x509_crt_verify_name( crt, cn, &ee_flags ); - - /* Check the type and size of the key */ - pk_type = mbedtls_pk_get_type( &crt->pk ); - - if( x509_profile_check_pk_alg( profile, pk_type ) != 0 ) - ee_flags |= MBEDTLS_X509_BADCERT_BAD_PK; - - if( x509_profile_check_key( profile, &crt->pk ) != 0 ) - ee_flags |= MBEDTLS_X509_BADCERT_BAD_KEY; - - /* Check the chain */ - ret = x509_crt_verify_chain( crt, trust_ca, ca_crl, - f_ca_cb, p_ca_cb, profile, - &ver_chain, rs_ctx ); - - if( ret != 0 ) - goto exit; - - /* Merge end-entity flags */ - ver_chain.items[0].flags |= ee_flags; - - /* Build final flags, calling callback on the way if any */ - ret = x509_crt_merge_flags_with_cb( flags, &ver_chain, f_vrfy, p_vrfy ); - -exit: - -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) - mbedtls_x509_crt_free( ver_chain.trust_ca_cb_result ); - mbedtls_free( ver_chain.trust_ca_cb_result ); - ver_chain.trust_ca_cb_result = NULL; -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) - if( rs_ctx != NULL && ret != MBEDTLS_ERR_ECP_IN_PROGRESS ) - mbedtls_x509_crt_restart_free( rs_ctx ); -#endif - - /* prevent misuse of the vrfy callback - VERIFY_FAILED would be ignored by - * the SSL module for authmode optional, but non-zero return from the - * callback means a fatal error so it shouldn't be ignored */ - if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ) - ret = MBEDTLS_ERR_X509_FATAL_ERROR; - - if( ret != 0 ) - { - *flags = (uint32_t) -1; - return( ret ); - } - - if( *flags != 0 ) - return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ); - - return( 0 ); -} - - -/* - * Verify the certificate validity (default profile, not restartable) - */ -int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt, - mbedtls_x509_crt *trust_ca, - mbedtls_x509_crl *ca_crl, - const char *cn, uint32_t *flags, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy ) -{ - return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl, - NULL, NULL, - &mbedtls_x509_crt_profile_default, - cn, flags, - f_vrfy, p_vrfy, NULL ) ); -} - -/* - * Verify the certificate validity (user-chosen profile, not restartable) - */ -int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt, - mbedtls_x509_crt *trust_ca, - mbedtls_x509_crl *ca_crl, - const mbedtls_x509_crt_profile *profile, - const char *cn, uint32_t *flags, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy ) -{ - return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl, - NULL, NULL, - profile, cn, flags, - f_vrfy, p_vrfy, NULL ) ); -} - -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) -/* - * Verify the certificate validity (user-chosen profile, CA callback, - * not restartable). - */ -int mbedtls_x509_crt_verify_with_ca_cb( mbedtls_x509_crt *crt, - mbedtls_x509_crt_ca_cb_t f_ca_cb, - void *p_ca_cb, - const mbedtls_x509_crt_profile *profile, - const char *cn, uint32_t *flags, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy ) -{ - return( x509_crt_verify_restartable_ca_cb( crt, NULL, NULL, - f_ca_cb, p_ca_cb, - profile, cn, flags, - f_vrfy, p_vrfy, NULL ) ); -} -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ - -int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt, - mbedtls_x509_crt *trust_ca, - mbedtls_x509_crl *ca_crl, - const mbedtls_x509_crt_profile *profile, - const char *cn, uint32_t *flags, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy, - mbedtls_x509_crt_restart_ctx *rs_ctx ) -{ - return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl, - NULL, NULL, - profile, cn, flags, - f_vrfy, p_vrfy, rs_ctx ) ); -} - - -/* - * Initialize a certificate chain - */ -void mbedtls_x509_crt_init( mbedtls_x509_crt *crt ) -{ - memset( crt, 0, sizeof(mbedtls_x509_crt) ); -} - -/* - * Unallocate all certificate data - */ -void mbedtls_x509_crt_free( mbedtls_x509_crt *crt ) -{ - mbedtls_x509_crt *cert_cur = crt; - mbedtls_x509_crt *cert_prv; - mbedtls_x509_name *name_cur; - mbedtls_x509_name *name_prv; - mbedtls_x509_sequence *seq_cur; - mbedtls_x509_sequence *seq_prv; - - if( crt == NULL ) - return; - - do - { - mbedtls_pk_free( &cert_cur->pk ); - -#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) - mbedtls_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; - mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); - mbedtls_free( name_prv ); - } - - name_cur = cert_cur->subject.next; - while( name_cur != NULL ) - { - name_prv = name_cur; - name_cur = name_cur->next; - mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); - mbedtls_free( name_prv ); - } - - seq_cur = cert_cur->ext_key_usage.next; - while( seq_cur != NULL ) - { - seq_prv = seq_cur; - seq_cur = seq_cur->next; - mbedtls_platform_zeroize( seq_prv, - sizeof( mbedtls_x509_sequence ) ); - mbedtls_free( seq_prv ); - } - - seq_cur = cert_cur->subject_alt_names.next; - while( seq_cur != NULL ) - { - seq_prv = seq_cur; - seq_cur = seq_cur->next; - mbedtls_platform_zeroize( seq_prv, - sizeof( mbedtls_x509_sequence ) ); - mbedtls_free( seq_prv ); - } - - seq_cur = cert_cur->certificate_policies.next; - while( seq_cur != NULL ) - { - seq_prv = seq_cur; - seq_cur = seq_cur->next; - mbedtls_platform_zeroize( seq_prv, - sizeof( mbedtls_x509_sequence ) ); - mbedtls_free( seq_prv ); - } - - if( cert_cur->raw.p != NULL && cert_cur->own_buffer ) - { - mbedtls_platform_zeroize( cert_cur->raw.p, cert_cur->raw.len ); - mbedtls_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; - - mbedtls_platform_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) ); - if( cert_prv != crt ) - mbedtls_free( cert_prv ); - } - while( cert_cur != NULL ); -} - -#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) -/* - * Initialize a restart context - */ -void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx ) -{ - mbedtls_pk_restart_init( &ctx->pk ); - - ctx->parent = NULL; - ctx->fallback_parent = NULL; - ctx->fallback_signature_is_good = 0; - - ctx->parent_is_trusted = -1; - - ctx->in_progress = x509_crt_rs_none; - ctx->self_cnt = 0; - x509_crt_verify_chain_reset( &ctx->ver_chain ); -} - -/* - * Free the components of a restart context - */ -void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx ) -{ - if( ctx == NULL ) - return; - - mbedtls_pk_restart_free( &ctx->pk ); - mbedtls_x509_crt_restart_init( ctx ); -} -#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ - -#endif /* MBEDTLS_X509_CRT_PARSE_C */ -- cgit v1.2.3