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Paul Bakker7c6b2c32013-09-16 13:49:26 +02001/*
Manuel Pégourié-Gonnard1c082f32014-06-12 22:34:55 +02002 * X.509 certificate parsing and verification
Paul Bakker7c6b2c32013-09-16 13:49:26 +02003 *
Manuel Pégourié-Gonnard6fb81872015-07-27 11:11:48 +02004 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Manuel Pégourié-Gonnard37ff1402015-09-04 14:21:07 +02005 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
Paul Bakker7c6b2c32013-09-16 13:49:26 +020018 *
Manuel Pégourié-Gonnardfe446432015-03-06 13:17:10 +000019 * This file is part of mbed TLS (https://tls.mbed.org)
Paul Bakker7c6b2c32013-09-16 13:49:26 +020020 */
21/*
22 * The ITU-T X.509 standard defines a certificate format for PKI.
23 *
Manuel Pégourié-Gonnard1c082f32014-06-12 22:34:55 +020024 * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
25 * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
26 * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
Paul Bakker7c6b2c32013-09-16 13:49:26 +020027 *
28 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
29 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
Manuel Pégourié-Gonnard2f09d592017-07-03 18:30:43 +020030 *
31 * [SIRO] https://cabforum.org/wp-content/uploads/Chunghwatelecom201503cabforumV4.pdf
Paul Bakker7c6b2c32013-09-16 13:49:26 +020032 */
33
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020034#if !defined(MBEDTLS_CONFIG_FILE)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000035#include "mbedtls/config.h"
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020036#else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020037#include MBEDTLS_CONFIG_FILE
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020038#endif
Paul Bakker7c6b2c32013-09-16 13:49:26 +020039
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020040#if defined(MBEDTLS_X509_CRT_PARSE_C)
Paul Bakker7c6b2c32013-09-16 13:49:26 +020041
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000042#include "mbedtls/x509_crt.h"
43#include "mbedtls/oid.h"
Andres Amaya Garcia1f6301b2018-04-17 09:51:09 -050044#include "mbedtls/platform_util.h"
Rich Evans00ab4702015-02-06 13:43:58 +000045
Rich Evans00ab4702015-02-06 13:43:58 +000046#include <string.h>
47
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020048#if defined(MBEDTLS_PEM_PARSE_C)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000049#include "mbedtls/pem.h"
Paul Bakker7c6b2c32013-09-16 13:49:26 +020050#endif
51
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020052#if defined(MBEDTLS_PLATFORM_C)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000053#include "mbedtls/platform.h"
Paul Bakker7c6b2c32013-09-16 13:49:26 +020054#else
Simon Butcherd2642582018-10-03 15:11:19 +010055#include <stdio.h>
Rich Evans00ab4702015-02-06 13:43:58 +000056#include <stdlib.h>
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020057#define mbedtls_free free
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +020058#define mbedtls_calloc calloc
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020059#define mbedtls_snprintf snprintf
Paul Bakker7c6b2c32013-09-16 13:49:26 +020060#endif
61
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020062#if defined(MBEDTLS_THREADING_C)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000063#include "mbedtls/threading.h"
Manuel Pégourié-Gonnard5ad68e42013-11-28 17:11:54 +010064#endif
65
Paul Bakkerfa6a6202013-10-28 18:48:30 +010066#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
Paul Bakker7c6b2c32013-09-16 13:49:26 +020067#include <windows.h>
68#else
69#include <time.h>
70#endif
71
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020072#if defined(MBEDTLS_FS_IO)
Rich Evans00ab4702015-02-06 13:43:58 +000073#include <stdio.h>
Paul Bakker5ff3f912014-04-04 15:08:20 +020074#if !defined(_WIN32) || defined(EFIX64) || defined(EFI32)
Paul Bakker7c6b2c32013-09-16 13:49:26 +020075#include <sys/types.h>
76#include <sys/stat.h>
77#include <dirent.h>
Rich Evans00ab4702015-02-06 13:43:58 +000078#endif /* !_WIN32 || EFIX64 || EFI32 */
Paul Bakker7c6b2c32013-09-16 13:49:26 +020079#endif
80
Manuel Pégourié-Gonnardc547d1a2017-07-05 13:28:45 +020081/*
82 * Item in a verification chain: cert and flags for it
83 */
84typedef struct {
85 mbedtls_x509_crt *crt;
86 uint32_t flags;
87} x509_crt_verify_chain_item;
88
89/*
90 * Max size of verification chain: end-entity + intermediates + trusted root
91 */
92#define X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 )
Paul Bakker34617722014-06-13 17:20:13 +020093
Paul Bakker7c6b2c32013-09-16 13:49:26 +020094/*
Manuel Pégourié-Gonnard88db5da2015-06-15 14:34:59 +020095 * Default profile
96 */
Manuel Pégourié-Gonnard88db5da2015-06-15 14:34:59 +020097const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default =
98{
Gilles Peskine5d2511c2017-05-12 13:16:40 +020099#if defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES)
Gilles Peskine5e79cb32017-05-04 16:17:21 +0200100 /* Allow SHA-1 (weak, but still safe in controlled environments) */
Manuel Pégourié-Gonnardf8ea8562015-06-15 15:33:19 +0200101 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 ) |
Gilles Peskine5e79cb32017-05-04 16:17:21 +0200102#endif
103 /* Only SHA-2 hashes */
Manuel Pégourié-Gonnardf8ea8562015-06-15 15:33:19 +0200104 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) |
105 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
106 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
107 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
108 0xFFFFFFF, /* Any PK alg */
109 0xFFFFFFF, /* Any curve */
Manuel Pégourié-Gonnard88db5da2015-06-15 14:34:59 +0200110 2048,
111};
112
113/*
114 * Next-default profile
115 */
Manuel Pégourié-Gonnard88db5da2015-06-15 14:34:59 +0200116const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next =
117{
Manuel Pégourié-Gonnardf8ea8562015-06-15 15:33:19 +0200118 /* Hashes from SHA-256 and above */
119 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
120 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
121 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
122 0xFFFFFFF, /* Any PK alg */
123#if defined(MBEDTLS_ECP_C)
124 /* Curves at or above 128-bit security level */
125 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
126 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) |
127 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) |
128 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) |
129 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) |
130 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) |
131 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ),
132#else
133 0,
134#endif
Manuel Pégourié-Gonnard88db5da2015-06-15 14:34:59 +0200135 2048,
136};
137
138/*
139 * NSA Suite B Profile
140 */
Manuel Pégourié-Gonnard88db5da2015-06-15 14:34:59 +0200141const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb =
142{
Manuel Pégourié-Gonnardf8ea8562015-06-15 15:33:19 +0200143 /* Only SHA-256 and 384 */
144 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
145 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ),
146 /* Only ECDSA */
Ron Eldor85e1dcf2018-02-06 15:59:38 +0200147 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ) |
148 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECKEY ),
Manuel Pégourié-Gonnardf8ea8562015-06-15 15:33:19 +0200149#if defined(MBEDTLS_ECP_C)
150 /* Only NIST P-256 and P-384 */
151 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
152 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ),
153#else
154 0,
155#endif
156 0,
Manuel Pégourié-Gonnard88db5da2015-06-15 14:34:59 +0200157};
158
159/*
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200160 * Check md_alg against profile
Manuel Pégourié-Gonnard3f816912017-10-26 10:24:16 +0200161 * Return 0 if md_alg is acceptable for this profile, -1 otherwise
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200162 */
163static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile,
164 mbedtls_md_type_t md_alg )
165{
Philippe Antoineb5b25432018-05-11 11:06:29 +0200166 if( md_alg == MBEDTLS_MD_NONE )
167 return( -1 );
168
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200169 if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 )
170 return( 0 );
171
172 return( -1 );
173}
174
175/*
176 * Check pk_alg against profile
Manuel Pégourié-Gonnard3f816912017-10-26 10:24:16 +0200177 * Return 0 if pk_alg is acceptable for this profile, -1 otherwise
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200178 */
179static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile,
180 mbedtls_pk_type_t pk_alg )
181{
Philippe Antoineb5b25432018-05-11 11:06:29 +0200182 if( pk_alg == MBEDTLS_PK_NONE )
183 return( -1 );
184
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200185 if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 )
186 return( 0 );
187
188 return( -1 );
189}
190
191/*
192 * Check key against profile
Manuel Pégourié-Gonnard3f816912017-10-26 10:24:16 +0200193 * Return 0 if pk is acceptable for this profile, -1 otherwise
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200194 */
195static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile,
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200196 const mbedtls_pk_context *pk )
197{
Manuel Pégourié-Gonnard3f816912017-10-26 10:24:16 +0200198 const mbedtls_pk_type_t pk_alg = mbedtls_pk_get_type( pk );
Manuel Pégourié-Gonnard19773ff2017-10-24 10:51:26 +0200199
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200200#if defined(MBEDTLS_RSA_C)
201 if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS )
202 {
Manuel Pégourié-Gonnard097c7bb2015-06-18 16:43:38 +0200203 if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen )
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200204 return( 0 );
205
206 return( -1 );
207 }
208#endif
209
Manuel Pégourié-Gonnard65eefc82015-10-23 14:08:48 +0200210#if defined(MBEDTLS_ECP_C)
211 if( pk_alg == MBEDTLS_PK_ECDSA ||
212 pk_alg == MBEDTLS_PK_ECKEY ||
213 pk_alg == MBEDTLS_PK_ECKEY_DH )
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200214 {
Manuel Pégourié-Gonnard3f816912017-10-26 10:24:16 +0200215 const mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp.id;
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200216
Philippe Antoineb5b25432018-05-11 11:06:29 +0200217 if( gid == MBEDTLS_ECP_DP_NONE )
218 return( -1 );
219
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +0200220 if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 )
221 return( 0 );
222
223 return( -1 );
224 }
225#endif
226
227 return( -1 );
228}
229
230/*
Hanno Becker1f8527f2018-11-02 09:19:16 +0000231 * Return 0 if name matches wildcard, -1 otherwise
232 */
233static int x509_check_wildcard( const char *cn, const mbedtls_x509_buf *name )
234{
235 size_t i;
236 size_t cn_idx = 0, cn_len = strlen( cn );
237
238 /* We can't have a match if there is no wildcard to match */
239 if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' )
240 return( -1 );
241
242 for( i = 0; i < cn_len; ++i )
243 {
244 if( cn[i] == '.' )
245 {
246 cn_idx = i;
247 break;
248 }
249 }
250
251 if( cn_idx == 0 )
252 return( -1 );
253
254 if( cn_len - cn_idx == name->len - 1 &&
Hanno Becker88de3422019-02-20 12:41:55 +0000255 mbedtls_x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
Hanno Becker1f8527f2018-11-02 09:19:16 +0000256 {
257 return( 0 );
258 }
259
260 return( -1 );
261}
262
263/*
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +0200264 * Reset (init or clear) a verify_chain
265 */
266static void x509_crt_verify_chain_reset(
267 mbedtls_x509_crt_verify_chain *ver_chain )
268{
269 size_t i;
270
271 for( i = 0; i < MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE; i++ )
272 {
273 ver_chain->items[i].crt = NULL;
Hanno Beckerd6ddcd62019-01-10 09:19:26 +0000274 ver_chain->items[i].flags = (uint32_t) -1;
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +0200275 }
276
277 ver_chain->len = 0;
278}
279
280/*
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200281 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
282 */
283static int x509_get_version( unsigned char **p,
284 const unsigned char *end,
285 int *ver )
286{
287 int ret;
288 size_t len;
289
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200290 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
291 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200292 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200293 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200294 {
295 *ver = 0;
296 return( 0 );
297 }
298
Hanno Becker2f472142019-02-12 11:52:10 +0000299 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200300 }
301
302 end = *p + len;
303
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200304 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
305 return( MBEDTLS_ERR_X509_INVALID_VERSION + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200306
307 if( *p != end )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200308 return( MBEDTLS_ERR_X509_INVALID_VERSION +
309 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200310
311 return( 0 );
312}
313
314/*
315 * Validity ::= SEQUENCE {
316 * notBefore Time,
317 * notAfter Time }
318 */
319static int x509_get_dates( unsigned char **p,
320 const unsigned char *end,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200321 mbedtls_x509_time *from,
322 mbedtls_x509_time *to )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200323{
324 int ret;
325 size_t len;
326
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200327 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
328 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
329 return( MBEDTLS_ERR_X509_INVALID_DATE + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200330
331 end = *p + len;
332
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200333 if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200334 return( ret );
335
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200336 if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200337 return( ret );
338
339 if( *p != end )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200340 return( MBEDTLS_ERR_X509_INVALID_DATE +
341 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200342
343 return( 0 );
344}
345
346/*
347 * X.509 v2/v3 unique identifier (not parsed)
348 */
349static int x509_get_uid( unsigned char **p,
350 const unsigned char *end,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200351 mbedtls_x509_buf *uid, int n )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200352{
353 int ret;
354
355 if( *p == end )
356 return( 0 );
357
358 uid->tag = **p;
359
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200360 if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len,
361 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200362 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200363 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200364 return( 0 );
365
Hanno Becker2f472142019-02-12 11:52:10 +0000366 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200367 }
368
369 uid->p = *p;
370 *p += uid->len;
371
372 return( 0 );
373}
374
375static int x509_get_basic_constraints( unsigned char **p,
376 const unsigned char *end,
377 int *ca_istrue,
378 int *max_pathlen )
379{
380 int ret;
381 size_t len;
382
383 /*
384 * BasicConstraints ::= SEQUENCE {
385 * cA BOOLEAN DEFAULT FALSE,
386 * pathLenConstraint INTEGER (0..MAX) OPTIONAL }
387 */
388 *ca_istrue = 0; /* DEFAULT FALSE */
389 *max_pathlen = 0; /* endless */
390
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200391 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
392 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
393 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200394
395 if( *p == end )
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200396 return( 0 );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200397
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200398 if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200399 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200400 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
401 ret = mbedtls_asn1_get_int( p, end, ca_istrue );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200402
403 if( ret != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200404 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200405
406 if( *ca_istrue != 0 )
407 *ca_istrue = 1;
408 }
409
410 if( *p == end )
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200411 return( 0 );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200412
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200413 if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 )
414 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200415
416 if( *p != end )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200417 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
418 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200419
420 (*max_pathlen)++;
421
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200422 return( 0 );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200423}
424
425static int x509_get_ns_cert_type( unsigned char **p,
426 const unsigned char *end,
427 unsigned char *ns_cert_type)
428{
429 int ret;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200430 mbedtls_x509_bitstring bs = { 0, 0, NULL };
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200431
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200432 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
433 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200434
435 if( bs.len != 1 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200436 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
437 MBEDTLS_ERR_ASN1_INVALID_LENGTH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200438
439 /* Get actual bitstring */
440 *ns_cert_type = *bs.p;
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200441 return( 0 );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200442}
443
444static int x509_get_key_usage( unsigned char **p,
445 const unsigned char *end,
Manuel Pégourié-Gonnard1d0ca1a2015-03-27 16:50:00 +0100446 unsigned int *key_usage)
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200447{
448 int ret;
Manuel Pégourié-Gonnard9a702252015-06-23 10:14:36 +0200449 size_t i;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200450 mbedtls_x509_bitstring bs = { 0, 0, NULL };
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200451
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200452 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
453 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200454
455 if( bs.len < 1 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200456 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
457 MBEDTLS_ERR_ASN1_INVALID_LENGTH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200458
459 /* Get actual bitstring */
Manuel Pégourié-Gonnard9a702252015-06-23 10:14:36 +0200460 *key_usage = 0;
461 for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ )
462 {
463 *key_usage |= (unsigned int) bs.p[i] << (8*i);
464 }
465
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200466 return( 0 );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200467}
468
469/*
470 * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
471 *
472 * KeyPurposeId ::= OBJECT IDENTIFIER
473 */
474static int x509_get_ext_key_usage( unsigned char **p,
475 const unsigned char *end,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200476 mbedtls_x509_sequence *ext_key_usage)
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200477{
478 int ret;
479
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200480 if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 )
481 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200482
483 /* Sequence length must be >= 1 */
484 if( ext_key_usage->buf.p == NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200485 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
486 MBEDTLS_ERR_ASN1_INVALID_LENGTH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200487
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200488 return( 0 );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200489}
490
491/*
492 * SubjectAltName ::= GeneralNames
493 *
494 * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
495 *
496 * GeneralName ::= CHOICE {
497 * otherName [0] OtherName,
498 * rfc822Name [1] IA5String,
499 * dNSName [2] IA5String,
500 * x400Address [3] ORAddress,
501 * directoryName [4] Name,
502 * ediPartyName [5] EDIPartyName,
503 * uniformResourceIdentifier [6] IA5String,
504 * iPAddress [7] OCTET STRING,
505 * registeredID [8] OBJECT IDENTIFIER }
506 *
507 * OtherName ::= SEQUENCE {
508 * type-id OBJECT IDENTIFIER,
509 * value [0] EXPLICIT ANY DEFINED BY type-id }
510 *
511 * EDIPartyName ::= SEQUENCE {
512 * nameAssigner [0] DirectoryString OPTIONAL,
513 * partyName [1] DirectoryString }
514 *
Manuel Pégourié-Gonnardb4fe3cb2015-01-22 16:11:05 +0000515 * NOTE: we only parse and use dNSName at this point.
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200516 */
517static int x509_get_subject_alt_name( unsigned char **p,
518 const unsigned char *end,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200519 mbedtls_x509_sequence *subject_alt_name )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200520{
521 int ret;
522 size_t len, tag_len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200523 mbedtls_asn1_buf *buf;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200524 unsigned char tag;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200525 mbedtls_asn1_sequence *cur = subject_alt_name;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200526
527 /* Get main sequence tag */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200528 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
529 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
530 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200531
532 if( *p + len != end )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200533 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
534 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200535
536 while( *p < end )
537 {
538 if( ( end - *p ) < 1 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200539 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
540 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200541
542 tag = **p;
543 (*p)++;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200544 if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 )
545 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200546
Andres Amaya Garcia849bc652017-08-25 17:13:12 +0100547 if( ( tag & MBEDTLS_ASN1_TAG_CLASS_MASK ) !=
548 MBEDTLS_ASN1_CONTEXT_SPECIFIC )
549 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200550 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
551 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
Andres Amaya Garcia849bc652017-08-25 17:13:12 +0100552 }
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200553
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +0200554 /* Skip everything but DNS name */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200555 if( tag != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | 2 ) )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200556 {
557 *p += tag_len;
558 continue;
559 }
560
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200561 /* Allocate and assign next pointer */
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +0200562 if( cur->buf.p != NULL )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200563 {
Manuel Pégourié-Gonnardb1340602014-11-11 23:11:16 +0100564 if( cur->next != NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200565 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
Manuel Pégourié-Gonnardb1340602014-11-11 23:11:16 +0100566
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200567 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200568
569 if( cur->next == NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200570 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200571 MBEDTLS_ERR_ASN1_ALLOC_FAILED );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200572
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200573 cur = cur->next;
574 }
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +0200575
576 buf = &(cur->buf);
577 buf->tag = tag;
578 buf->p = *p;
579 buf->len = tag_len;
580 *p += buf->len;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200581 }
582
583 /* Set final sequence entry's next pointer to NULL */
584 cur->next = NULL;
585
586 if( *p != end )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200587 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
588 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200589
590 return( 0 );
591}
592
593/*
594 * X.509 v3 extensions
595 *
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200596 */
597static int x509_get_crt_ext( unsigned char **p,
598 const unsigned char *end,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200599 mbedtls_x509_crt *crt )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200600{
601 int ret;
602 size_t len;
603 unsigned char *end_ext_data, *end_ext_octet;
604
Hanno Becker4e1bfc12019-02-12 17:22:36 +0000605 if( *p == end )
606 return( 0 );
607
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200608 if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200609 return( ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200610
Hanno Becker4e1bfc12019-02-12 17:22:36 +0000611 end = crt->v3_ext.p + crt->v3_ext.len;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200612 while( *p < end )
613 {
614 /*
615 * Extension ::= SEQUENCE {
616 * extnID OBJECT IDENTIFIER,
617 * critical BOOLEAN DEFAULT FALSE,
618 * extnValue OCTET STRING }
619 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200620 mbedtls_x509_buf extn_oid = {0, 0, NULL};
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200621 int is_critical = 0; /* DEFAULT FALSE */
622 int ext_type = 0;
623
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200624 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
625 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
626 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200627
628 end_ext_data = *p + len;
629
630 /* Get extension ID */
k-stachowiakdcae78a2018-06-28 16:32:54 +0200631 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len,
k-stachowiak463928a2018-07-24 12:50:59 +0200632 MBEDTLS_ASN1_OID ) ) != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200633 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200634
k-stachowiak463928a2018-07-24 12:50:59 +0200635 extn_oid.tag = MBEDTLS_ASN1_OID;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200636 extn_oid.p = *p;
637 *p += extn_oid.len;
638
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200639 /* Get optional critical */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200640 if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
641 ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) )
642 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200643
644 /* Data should be octet string type */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200645 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len,
646 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
647 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200648
649 end_ext_octet = *p + len;
650
651 if( end_ext_octet != end_ext_data )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200652 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
653 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200654
655 /*
656 * Detect supported extensions
657 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200658 ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200659
660 if( ret != 0 )
661 {
662 /* No parser found, skip extension */
663 *p = end_ext_octet;
664
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200665#if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200666 if( is_critical )
667 {
668 /* Data is marked as critical: fail */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200669 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
670 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200671 }
672#endif
673 continue;
674 }
675
Manuel Pégourié-Gonnard8a5e3d42014-11-12 17:47:28 +0100676 /* Forbid repeated extensions */
677 if( ( crt->ext_types & ext_type ) != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200678 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
Manuel Pégourié-Gonnard8a5e3d42014-11-12 17:47:28 +0100679
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200680 crt->ext_types |= ext_type;
681
682 switch( ext_type )
683 {
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +0100684 case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS:
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200685 /* Parse basic constraints */
686 if( ( ret = x509_get_basic_constraints( p, end_ext_octet,
687 &crt->ca_istrue, &crt->max_pathlen ) ) != 0 )
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200688 return( ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200689 break;
690
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200691 case MBEDTLS_X509_EXT_KEY_USAGE:
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200692 /* Parse key usage */
693 if( ( ret = x509_get_key_usage( p, end_ext_octet,
694 &crt->key_usage ) ) != 0 )
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200695 return( ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200696 break;
697
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200698 case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE:
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200699 /* Parse extended key usage */
Hanno Becker7ec9c362019-02-21 14:24:05 +0000700 crt->ext_key_usage_raw.p = *p;
701 crt->ext_key_usage_raw.len = end_ext_octet - *p;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200702 if( ( ret = x509_get_ext_key_usage( p, end_ext_octet,
703 &crt->ext_key_usage ) ) != 0 )
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200704 return( ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200705 break;
706
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +0100707 case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200708 /* Parse subject alt name */
709 if( ( ret = x509_get_subject_alt_name( p, end_ext_octet,
710 &crt->subject_alt_names ) ) != 0 )
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200711 return( ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200712 break;
713
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200714 case MBEDTLS_X509_EXT_NS_CERT_TYPE:
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200715 /* Parse netscape certificate type */
716 if( ( ret = x509_get_ns_cert_type( p, end_ext_octet,
717 &crt->ns_cert_type ) ) != 0 )
Paul Bakkerd8bb8262014-06-17 14:06:49 +0200718 return( ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200719 break;
720
721 default:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200722 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200723 }
724 }
725
726 if( *p != end )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200727 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
728 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200729
730 return( 0 );
731}
732
733/*
734 * Parse and fill a single X.509 certificate in DER format
735 */
Hanno Beckeraa8665a2019-01-31 08:57:44 +0000736static int x509_crt_parse_der_core( mbedtls_x509_crt *crt,
737 const unsigned char *buf,
738 size_t buflen,
739 int make_copy )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200740{
741 int ret;
742 size_t len;
743 unsigned char *p, *end, *crt_end;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200744 mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
Manuel Pégourié-Gonnard59a75d52014-01-22 10:12:57 +0100745
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200746 memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) );
747 memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) );
748 memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200749
750 /*
751 * Check for valid input
752 */
753 if( crt == NULL || buf == NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200754 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200755
Hanno Beckeraa8665a2019-01-31 08:57:44 +0000756 /* Use the original buffer until we figure out actual length. */
Janos Follathcc0e49d2016-02-17 14:34:12 +0000757 p = (unsigned char*) buf;
758 len = buflen;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200759 end = p + len;
760
761 /*
762 * Certificate ::= SEQUENCE {
763 * tbsCertificate TBSCertificate,
764 * signatureAlgorithm AlgorithmIdentifier,
765 * signatureValue BIT STRING }
766 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200767 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
768 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200769 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200770 mbedtls_x509_crt_free( crt );
771 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200772 }
773
Janos Follathcc0e49d2016-02-17 14:34:12 +0000774 end = crt_end = p + len;
Hanno Beckeraa8665a2019-01-31 08:57:44 +0000775 crt->raw.len = crt_end - buf;
776 if( make_copy != 0 )
777 {
778 /* Create and populate a new buffer for the raw field. */
779 crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len );
780 if( crt->raw.p == NULL )
781 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
782
783 memcpy( crt->raw.p, buf, crt->raw.len );
784 crt->own_buffer = 1;
785
786 p += crt->raw.len - len;
787 end = crt_end = p + len;
788 }
789 else
790 {
791 crt->raw.p = (unsigned char*) buf;
792 crt->own_buffer = 0;
793 }
Janos Follathcc0e49d2016-02-17 14:34:12 +0000794
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200795 /*
796 * TBSCertificate ::= SEQUENCE {
797 */
798 crt->tbs.p = p;
799
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200800 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
801 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200802 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200803 mbedtls_x509_crt_free( crt );
804 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200805 }
806
807 end = p + len;
808 crt->tbs.len = end - crt->tbs.p;
809
810 /*
811 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
812 *
813 * CertificateSerialNumber ::= INTEGER
814 *
815 * signature AlgorithmIdentifier
816 */
817 if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 ||
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200818 ( ret = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 ||
819 ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid,
Manuel Pégourié-Gonnarddddbb1d2014-06-05 17:02:24 +0200820 &sig_params1 ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200821 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200822 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200823 return( ret );
824 }
825
Andres AG7ca4a032017-03-09 16:16:11 +0000826 if( crt->version < 0 || crt->version > 2 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200827 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200828 mbedtls_x509_crt_free( crt );
829 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200830 }
831
Andres AG7ca4a032017-03-09 16:16:11 +0000832 crt->version++;
833
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200834 if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1,
Manuel Pégourié-Gonnardf75f2f72014-06-05 15:14:28 +0200835 &crt->sig_md, &crt->sig_pk,
836 &crt->sig_opts ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200837 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200838 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200839 return( ret );
840 }
841
842 /*
843 * issuer Name
844 */
845 crt->issuer_raw.p = p;
846
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200847 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
848 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200849 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200850 mbedtls_x509_crt_free( crt );
851 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200852 }
Hanno Beckerf8a42862019-02-20 13:45:16 +0000853 crt->issuer_raw_no_hdr.p = p;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200854
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200855 if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200856 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200857 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200858 return( ret );
859 }
860
Hanno Beckerf8a42862019-02-20 13:45:16 +0000861 crt->issuer_raw_no_hdr.len = p - crt->issuer_raw_no_hdr.p;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200862 crt->issuer_raw.len = p - crt->issuer_raw.p;
863
864 /*
865 * Validity ::= SEQUENCE {
866 * notBefore Time,
867 * notAfter Time }
868 *
869 */
870 if( ( ret = x509_get_dates( &p, end, &crt->valid_from,
871 &crt->valid_to ) ) != 0 )
872 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200873 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200874 return( ret );
875 }
876
877 /*
878 * subject Name
879 */
880 crt->subject_raw.p = p;
881
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200882 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
883 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200884 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200885 mbedtls_x509_crt_free( crt );
886 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200887 }
888
Hanno Beckerf8a42862019-02-20 13:45:16 +0000889 crt->subject_raw_no_hdr.p = p;
890
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200891 if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200892 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200893 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200894 return( ret );
895 }
896
Hanno Beckerf8a42862019-02-20 13:45:16 +0000897 crt->subject_raw_no_hdr.len = p - crt->subject_raw_no_hdr.p;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200898 crt->subject_raw.len = p - crt->subject_raw.p;
899
900 /*
901 * SubjectPublicKeyInfo
902 */
Hanno Becker32c530e2019-02-06 16:13:41 +0000903 crt->pk_raw.p = p;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200904 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200905 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200906 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200907 return( ret );
908 }
Hanno Becker32c530e2019-02-06 16:13:41 +0000909 crt->pk_raw.len = p - crt->pk_raw.p;
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200910
911 /*
912 * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
913 * -- If present, version shall be v2 or v3
914 * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
915 * -- If present, version shall be v2 or v3
916 * extensions [3] EXPLICIT Extensions OPTIONAL
917 * -- If present, version shall be v3
918 */
919 if( crt->version == 2 || crt->version == 3 )
920 {
921 ret = x509_get_uid( &p, end, &crt->issuer_id, 1 );
922 if( ret != 0 )
923 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200924 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200925 return( ret );
926 }
927 }
928
929 if( crt->version == 2 || crt->version == 3 )
930 {
931 ret = x509_get_uid( &p, end, &crt->subject_id, 2 );
932 if( ret != 0 )
933 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200934 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200935 return( ret );
936 }
937 }
938
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200939#if !defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3)
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200940 if( crt->version == 3 )
Paul Bakkerc27c4e22013-09-23 15:01:36 +0200941#endif
Manuel Pégourié-Gonnarda252af72015-03-27 16:15:55 +0100942 {
Paul Bakker66d5d072014-06-17 16:39:18 +0200943 ret = x509_get_crt_ext( &p, end, crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200944 if( ret != 0 )
945 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200946 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200947 return( ret );
948 }
949 }
950
951 if( p != end )
952 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200953 mbedtls_x509_crt_free( crt );
954 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
955 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200956 }
957
958 end = crt_end;
959
960 /*
961 * }
962 * -- end of TBSCertificate
963 *
964 * signatureAlgorithm AlgorithmIdentifier,
965 * signatureValue BIT STRING
966 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200967 if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200968 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200969 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200970 return( ret );
971 }
972
Manuel Pégourié-Gonnard1022fed2015-03-27 16:30:47 +0100973 if( crt->sig_oid.len != sig_oid2.len ||
974 memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 ||
Manuel Pégourié-Gonnarddddbb1d2014-06-05 17:02:24 +0200975 sig_params1.len != sig_params2.len ||
Manuel Pégourié-Gonnard159c5242015-04-30 11:15:22 +0200976 ( sig_params1.len != 0 &&
977 memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200978 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200979 mbedtls_x509_crt_free( crt );
980 return( MBEDTLS_ERR_X509_SIG_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200981 }
982
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200983 if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200984 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200985 mbedtls_x509_crt_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200986 return( ret );
987 }
988
989 if( p != end )
990 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200991 mbedtls_x509_crt_free( crt );
992 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
993 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Paul Bakker7c6b2c32013-09-16 13:49:26 +0200994 }
995
996 return( 0 );
997}
998
999/*
1000 * Parse one X.509 certificate in DER format from a buffer and add them to a
1001 * chained list
1002 */
Hanno Beckeraa8665a2019-01-31 08:57:44 +00001003static int mbedtls_x509_crt_parse_der_internal( mbedtls_x509_crt *chain,
1004 const unsigned char *buf,
1005 size_t buflen,
1006 int make_copy )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001007{
1008 int ret;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001009 mbedtls_x509_crt *crt = chain, *prev = NULL;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001010
1011 /*
1012 * Check for valid input
1013 */
1014 if( crt == NULL || buf == NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001015 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001016
1017 while( crt->version != 0 && crt->next != NULL )
1018 {
1019 prev = crt;
1020 crt = crt->next;
1021 }
1022
1023 /*
1024 * Add new certificate on the end of the chain if needed.
1025 */
Paul Bakker66d5d072014-06-17 16:39:18 +02001026 if( crt->version != 0 && crt->next == NULL )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001027 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02001028 crt->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001029
1030 if( crt->next == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02001031 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001032
1033 prev = crt;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001034 mbedtls_x509_crt_init( crt->next );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001035 crt = crt->next;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001036 }
1037
Hanno Beckeraa8665a2019-01-31 08:57:44 +00001038 if( ( ret = x509_crt_parse_der_core( crt, buf, buflen, make_copy ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001039 {
1040 if( prev )
1041 prev->next = NULL;
1042
1043 if( crt != chain )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001044 mbedtls_free( crt );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001045
1046 return( ret );
1047 }
1048
1049 return( 0 );
1050}
1051
Hanno Beckeraa8665a2019-01-31 08:57:44 +00001052int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain,
1053 const unsigned char *buf,
1054 size_t buflen )
1055{
1056 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 0 ) );
1057}
1058
1059int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
1060 const unsigned char *buf,
1061 size_t buflen )
1062{
1063 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 1 ) );
1064}
1065
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001066/*
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02001067 * Parse one or more PEM certificates from a buffer and add them to the chained
1068 * list
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001069 */
Hanno Beckeraa8665a2019-01-31 08:57:44 +00001070int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain,
1071 const unsigned char *buf,
1072 size_t buflen )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001073{
Janos Follath98e28a72016-05-31 14:03:54 +01001074#if defined(MBEDTLS_PEM_PARSE_C)
Andres AGc0db5112016-12-07 15:05:53 +00001075 int success = 0, first_error = 0, total_failed = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001076 int buf_format = MBEDTLS_X509_FORMAT_DER;
Janos Follath98e28a72016-05-31 14:03:54 +01001077#endif
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001078
1079 /*
1080 * Check for valid input
1081 */
1082 if( chain == NULL || buf == NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001083 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001084
1085 /*
1086 * Determine buffer content. Buffer contains either one DER certificate or
1087 * one or more PEM certificates.
1088 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001089#if defined(MBEDTLS_PEM_PARSE_C)
Manuel Pégourié-Gonnard0ece0f92015-05-12 12:43:54 +02001090 if( buflen != 0 && buf[buflen - 1] == '\0' &&
Manuel Pégourié-Gonnard43b37cb2015-05-12 11:20:10 +02001091 strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL )
1092 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001093 buf_format = MBEDTLS_X509_FORMAT_PEM;
Manuel Pégourié-Gonnard43b37cb2015-05-12 11:20:10 +02001094 }
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001095
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001096 if( buf_format == MBEDTLS_X509_FORMAT_DER )
1097 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
Janos Follath98e28a72016-05-31 14:03:54 +01001098#else
1099 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
1100#endif
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001101
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001102#if defined(MBEDTLS_PEM_PARSE_C)
1103 if( buf_format == MBEDTLS_X509_FORMAT_PEM )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001104 {
1105 int ret;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001106 mbedtls_pem_context pem;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001107
Manuel Pégourié-Gonnard43b37cb2015-05-12 11:20:10 +02001108 /* 1 rather than 0 since the terminating NULL byte is counted in */
1109 while( buflen > 1 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001110 {
1111 size_t use_len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001112 mbedtls_pem_init( &pem );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001113
Manuel Pégourié-Gonnard43b37cb2015-05-12 11:20:10 +02001114 /* If we get there, we know the string is null-terminated */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001115 ret = mbedtls_pem_read_buffer( &pem,
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001116 "-----BEGIN CERTIFICATE-----",
1117 "-----END CERTIFICATE-----",
1118 buf, NULL, 0, &use_len );
1119
1120 if( ret == 0 )
1121 {
1122 /*
1123 * Was PEM encoded
1124 */
1125 buflen -= use_len;
1126 buf += use_len;
1127 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001128 else if( ret == MBEDTLS_ERR_PEM_BAD_INPUT_DATA )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001129 {
1130 return( ret );
1131 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001132 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001133 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001134 mbedtls_pem_free( &pem );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001135
1136 /*
1137 * PEM header and footer were found
1138 */
1139 buflen -= use_len;
1140 buf += use_len;
1141
1142 if( first_error == 0 )
1143 first_error = ret;
1144
Paul Bakker5a5fa922014-09-26 14:53:04 +02001145 total_failed++;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001146 continue;
1147 }
1148 else
1149 break;
1150
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001151 ret = mbedtls_x509_crt_parse_der( chain, pem.buf, pem.buflen );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001152
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001153 mbedtls_pem_free( &pem );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001154
1155 if( ret != 0 )
1156 {
1157 /*
1158 * Quit parsing on a memory error
1159 */
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02001160 if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001161 return( ret );
1162
1163 if( first_error == 0 )
1164 first_error = ret;
1165
1166 total_failed++;
1167 continue;
1168 }
1169
1170 success = 1;
1171 }
1172 }
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001173
1174 if( success )
1175 return( total_failed );
1176 else if( first_error )
1177 return( first_error );
1178 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001179 return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT );
Janos Follath98e28a72016-05-31 14:03:54 +01001180#endif /* MBEDTLS_PEM_PARSE_C */
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001181}
1182
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001183#if defined(MBEDTLS_FS_IO)
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001184/*
1185 * Load one or more certificates and add them to the chained list
1186 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001187int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001188{
1189 int ret;
1190 size_t n;
1191 unsigned char *buf;
1192
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001193 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001194 return( ret );
1195
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001196 ret = mbedtls_x509_crt_parse( chain, buf, n );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001197
Andres Amaya Garcia1f6301b2018-04-17 09:51:09 -05001198 mbedtls_platform_zeroize( buf, n );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001199 mbedtls_free( buf );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001200
1201 return( ret );
1202}
1203
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001204int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001205{
1206 int ret = 0;
Paul Bakkerfa6a6202013-10-28 18:48:30 +01001207#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001208 int w_ret;
1209 WCHAR szDir[MAX_PATH];
1210 char filename[MAX_PATH];
Paul Bakker9af723c2014-05-01 13:03:14 +02001211 char *p;
Manuel Pégourié-Gonnard261faed2015-10-21 10:16:29 +02001212 size_t len = strlen( path );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001213
Paul Bakker9af723c2014-05-01 13:03:14 +02001214 WIN32_FIND_DATAW file_data;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001215 HANDLE hFind;
1216
1217 if( len > MAX_PATH - 3 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001218 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001219
Paul Bakker9af723c2014-05-01 13:03:14 +02001220 memset( szDir, 0, sizeof(szDir) );
1221 memset( filename, 0, MAX_PATH );
1222 memcpy( filename, path, len );
1223 filename[len++] = '\\';
1224 p = filename + len;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001225 filename[len++] = '*';
1226
Simon B3c6b18d2016-11-03 01:11:37 +00001227 w_ret = MultiByteToWideChar( CP_ACP, 0, filename, (int)len, szDir,
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02001228 MAX_PATH - 3 );
Manuel Pégourié-Gonnardacdb9b92015-01-23 17:50:34 +00001229 if( w_ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001230 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001231
1232 hFind = FindFirstFileW( szDir, &file_data );
Paul Bakker66d5d072014-06-17 16:39:18 +02001233 if( hFind == INVALID_HANDLE_VALUE )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001234 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001235
1236 len = MAX_PATH - len;
1237 do
1238 {
Paul Bakker9af723c2014-05-01 13:03:14 +02001239 memset( p, 0, len );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001240
1241 if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
1242 continue;
1243
Paul Bakker9af723c2014-05-01 13:03:14 +02001244 w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName,
Paul Bakker66d5d072014-06-17 16:39:18 +02001245 lstrlenW( file_data.cFileName ),
Manuel Pégourié-Gonnard261faed2015-10-21 10:16:29 +02001246 p, (int) len - 1,
Paul Bakker9af723c2014-05-01 13:03:14 +02001247 NULL, NULL );
Manuel Pégourié-Gonnardacdb9b92015-01-23 17:50:34 +00001248 if( w_ret == 0 )
Ron Eldor36d90422017-01-09 15:09:16 +02001249 {
1250 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1251 goto cleanup;
1252 }
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001253
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001254 w_ret = mbedtls_x509_crt_parse_file( chain, filename );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001255 if( w_ret < 0 )
1256 ret++;
1257 else
1258 ret += w_ret;
1259 }
1260 while( FindNextFileW( hFind, &file_data ) != 0 );
1261
Paul Bakker66d5d072014-06-17 16:39:18 +02001262 if( GetLastError() != ERROR_NO_MORE_FILES )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001263 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001264
Ron Eldor36d90422017-01-09 15:09:16 +02001265cleanup:
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001266 FindClose( hFind );
Paul Bakkerbe089b02013-10-14 15:51:50 +02001267#else /* _WIN32 */
Manuel Pégourié-Gonnard964bf9b2013-11-26 16:47:11 +01001268 int t_ret;
Andres AGf9113192016-09-02 14:06:04 +01001269 int snp_ret;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001270 struct stat sb;
Manuel Pégourié-Gonnard964bf9b2013-11-26 16:47:11 +01001271 struct dirent *entry;
Andres AGf9113192016-09-02 14:06:04 +01001272 char entry_name[MBEDTLS_X509_MAX_FILE_PATH_LEN];
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001273 DIR *dir = opendir( path );
1274
Paul Bakker66d5d072014-06-17 16:39:18 +02001275 if( dir == NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001276 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001277
Ron Eldor63140682017-01-09 19:27:59 +02001278#if defined(MBEDTLS_THREADING_C)
Manuel Pégourié-Gonnard944cfe82015-05-27 20:07:18 +02001279 if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 )
Manuel Pégourié-Gonnardf9b85d92015-06-22 18:39:57 +02001280 {
1281 closedir( dir );
Manuel Pégourié-Gonnard5ad68e42013-11-28 17:11:54 +01001282 return( ret );
Manuel Pégourié-Gonnardf9b85d92015-06-22 18:39:57 +02001283 }
Ron Eldor63140682017-01-09 19:27:59 +02001284#endif /* MBEDTLS_THREADING_C */
Manuel Pégourié-Gonnard5ad68e42013-11-28 17:11:54 +01001285
Manuel Pégourié-Gonnard964bf9b2013-11-26 16:47:11 +01001286 while( ( entry = readdir( dir ) ) != NULL )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001287 {
Andres AGf9113192016-09-02 14:06:04 +01001288 snp_ret = mbedtls_snprintf( entry_name, sizeof entry_name,
1289 "%s/%s", path, entry->d_name );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001290
Andres AGf9113192016-09-02 14:06:04 +01001291 if( snp_ret < 0 || (size_t)snp_ret >= sizeof entry_name )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001292 {
Andres AGf9113192016-09-02 14:06:04 +01001293 ret = MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
1294 goto cleanup;
1295 }
1296 else if( stat( entry_name, &sb ) == -1 )
1297 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001298 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
Manuel Pégourié-Gonnard5ad68e42013-11-28 17:11:54 +01001299 goto cleanup;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001300 }
1301
1302 if( !S_ISREG( sb.st_mode ) )
1303 continue;
1304
1305 // Ignore parse errors
1306 //
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001307 t_ret = mbedtls_x509_crt_parse_file( chain, entry_name );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001308 if( t_ret < 0 )
1309 ret++;
1310 else
1311 ret += t_ret;
1312 }
Manuel Pégourié-Gonnard5ad68e42013-11-28 17:11:54 +01001313
1314cleanup:
Andres AGf9113192016-09-02 14:06:04 +01001315 closedir( dir );
1316
Ron Eldor63140682017-01-09 19:27:59 +02001317#if defined(MBEDTLS_THREADING_C)
Manuel Pégourié-Gonnard944cfe82015-05-27 20:07:18 +02001318 if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001319 ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
Ron Eldor63140682017-01-09 19:27:59 +02001320#endif /* MBEDTLS_THREADING_C */
Manuel Pégourié-Gonnard5ad68e42013-11-28 17:11:54 +01001321
Paul Bakkerbe089b02013-10-14 15:51:50 +02001322#endif /* _WIN32 */
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001323
1324 return( ret );
1325}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001326#endif /* MBEDTLS_FS_IO */
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001327
Hanno Becker02a21932019-06-10 15:08:43 +01001328#if !defined(MBEDTLS_X509_REMOVE_INFO)
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +02001329static int x509_info_subject_alt_name( char **buf, size_t *size,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001330 const mbedtls_x509_sequence *subject_alt_name )
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +02001331{
1332 size_t i;
1333 size_t n = *size;
1334 char *p = *buf;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001335 const mbedtls_x509_sequence *cur = subject_alt_name;
Manuel Pégourié-Gonnard7b30cfc2014-04-01 18:00:07 +02001336 const char *sep = "";
1337 size_t sep_len = 0;
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +02001338
1339 while( cur != NULL )
1340 {
Manuel Pégourié-Gonnard7b30cfc2014-04-01 18:00:07 +02001341 if( cur->buf.len + sep_len >= n )
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +02001342 {
1343 *p = '\0';
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001344 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +02001345 }
1346
Manuel Pégourié-Gonnard7b30cfc2014-04-01 18:00:07 +02001347 n -= cur->buf.len + sep_len;
1348 for( i = 0; i < sep_len; i++ )
1349 *p++ = sep[i];
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +02001350 for( i = 0; i < cur->buf.len; i++ )
1351 *p++ = cur->buf.p[i];
1352
Manuel Pégourié-Gonnard7b30cfc2014-04-01 18:00:07 +02001353 sep = ", ";
1354 sep_len = 2;
1355
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +02001356 cur = cur->next;
1357 }
1358
1359 *p = '\0';
1360
1361 *size = n;
1362 *buf = p;
1363
1364 return( 0 );
1365}
1366
Manuel Pégourié-Gonnard0db29b02014-04-01 18:12:24 +02001367#define PRINT_ITEM(i) \
1368 { \
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001369 ret = mbedtls_snprintf( p, n, "%s" i, sep ); \
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001370 MBEDTLS_X509_SAFE_SNPRINTF; \
Manuel Pégourié-Gonnard0db29b02014-04-01 18:12:24 +02001371 sep = ", "; \
1372 }
1373
1374#define CERT_TYPE(type,name) \
Hanno Beckerd6028a12018-10-15 12:01:35 +01001375 if( ns_cert_type & (type) ) \
Manuel Pégourié-Gonnard0db29b02014-04-01 18:12:24 +02001376 PRINT_ITEM( name );
1377
Manuel Pégourié-Gonnard919f8f52014-04-01 13:01:11 +02001378static int x509_info_cert_type( char **buf, size_t *size,
1379 unsigned char ns_cert_type )
1380{
1381 int ret;
1382 size_t n = *size;
1383 char *p = *buf;
Manuel Pégourié-Gonnard7b30cfc2014-04-01 18:00:07 +02001384 const char *sep = "";
Manuel Pégourié-Gonnard919f8f52014-04-01 13:01:11 +02001385
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001386 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" );
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001387 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001388 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" );
1389 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" );
1390 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" );
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001391 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" );
1392 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" );
1393 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" );
Manuel Pégourié-Gonnard919f8f52014-04-01 13:01:11 +02001394
1395 *size = n;
1396 *buf = p;
1397
1398 return( 0 );
1399}
1400
Manuel Pégourié-Gonnard0db29b02014-04-01 18:12:24 +02001401#define KEY_USAGE(code,name) \
Hanno Beckerd6028a12018-10-15 12:01:35 +01001402 if( key_usage & (code) ) \
Manuel Pégourié-Gonnard0db29b02014-04-01 18:12:24 +02001403 PRINT_ITEM( name );
1404
Manuel Pégourié-Gonnard65c2ddc2014-04-01 14:12:11 +02001405static int x509_info_key_usage( char **buf, size_t *size,
Manuel Pégourié-Gonnard9a702252015-06-23 10:14:36 +02001406 unsigned int key_usage )
Manuel Pégourié-Gonnard65c2ddc2014-04-01 14:12:11 +02001407{
1408 int ret;
1409 size_t n = *size;
1410 char *p = *buf;
Manuel Pégourié-Gonnard7b30cfc2014-04-01 18:00:07 +02001411 const char *sep = "";
Manuel Pégourié-Gonnard65c2ddc2014-04-01 14:12:11 +02001412
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001413 KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" );
1414 KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" );
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001415 KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" );
1416 KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" );
1417 KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001418 KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" );
1419 KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" );
Manuel Pégourié-Gonnard9a702252015-06-23 10:14:36 +02001420 KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" );
1421 KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" );
Manuel Pégourié-Gonnard65c2ddc2014-04-01 14:12:11 +02001422
1423 *size = n;
1424 *buf = p;
1425
1426 return( 0 );
1427}
1428
Manuel Pégourié-Gonnardf6f4ab42014-04-01 17:32:44 +02001429static int x509_info_ext_key_usage( char **buf, size_t *size,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001430 const mbedtls_x509_sequence *extended_key_usage )
Manuel Pégourié-Gonnardf6f4ab42014-04-01 17:32:44 +02001431{
1432 int ret;
1433 const char *desc;
1434 size_t n = *size;
1435 char *p = *buf;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001436 const mbedtls_x509_sequence *cur = extended_key_usage;
Manuel Pégourié-Gonnard7b30cfc2014-04-01 18:00:07 +02001437 const char *sep = "";
Manuel Pégourié-Gonnardf6f4ab42014-04-01 17:32:44 +02001438
1439 while( cur != NULL )
1440 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001441 if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 )
Manuel Pégourié-Gonnardf6f4ab42014-04-01 17:32:44 +02001442 desc = "???";
1443
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001444 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001445 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnardf6f4ab42014-04-01 17:32:44 +02001446
Manuel Pégourié-Gonnard7b30cfc2014-04-01 18:00:07 +02001447 sep = ", ";
1448
Manuel Pégourié-Gonnardf6f4ab42014-04-01 17:32:44 +02001449 cur = cur->next;
1450 }
1451
1452 *size = n;
1453 *buf = p;
1454
1455 return( 0 );
1456}
1457
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001458/*
1459 * Return an informational string about the certificate.
1460 */
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001461#define BEFORE_COLON 18
1462#define BC "18"
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001463int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix,
1464 const mbedtls_x509_crt *crt )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001465{
1466 int ret;
1467 size_t n;
1468 char *p;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001469 char key_size_str[BEFORE_COLON];
1470
1471 p = buf;
1472 n = size;
1473
Janos Follath98e28a72016-05-31 14:03:54 +01001474 if( NULL == crt )
1475 {
1476 ret = mbedtls_snprintf( p, n, "\nCertificate is uninitialised!\n" );
1477 MBEDTLS_X509_SAFE_SNPRINTF;
1478
1479 return( (int) ( size - n ) );
1480 }
1481
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001482 ret = mbedtls_snprintf( p, n, "%scert. version : %d\n",
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001483 prefix, crt->version );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001484 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001485 ret = mbedtls_snprintf( p, n, "%sserial number : ",
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001486 prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001487 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001488
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001489 ret = mbedtls_x509_serial_gets( p, n, &crt->serial );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001490 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001491
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001492 ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001493 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001494 ret = mbedtls_x509_dn_gets( p, n, &crt->issuer );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001495 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001496
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001497 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001498 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001499 ret = mbedtls_x509_dn_gets( p, n, &crt->subject );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001500 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001501
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001502 ret = mbedtls_snprintf( p, n, "\n%sissued on : " \
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001503 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
1504 crt->valid_from.year, crt->valid_from.mon,
1505 crt->valid_from.day, crt->valid_from.hour,
1506 crt->valid_from.min, crt->valid_from.sec );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001507 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001508
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001509 ret = mbedtls_snprintf( p, n, "\n%sexpires on : " \
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001510 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
1511 crt->valid_to.year, crt->valid_to.mon,
1512 crt->valid_to.day, crt->valid_to.hour,
1513 crt->valid_to.min, crt->valid_to.sec );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001514 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001515
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001516 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001517 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001518
Hanno Becker83cd8672019-02-21 17:13:46 +00001519 ret = mbedtls_x509_sig_alg_gets( p, n, sig_info.sig_pk,
1520 sig_info.sig_md, sig_info.sig_opts );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001521 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001522
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001523 /* Key size */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001524 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
1525 mbedtls_pk_get_name( &crt->pk ) ) ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001526 {
1527 return( ret );
1528 }
1529
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001530 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str,
Manuel Pégourié-Gonnard097c7bb2015-06-18 16:43:38 +02001531 (int) mbedtls_pk_get_bitlen( &crt->pk ) );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001532 MBEDTLS_X509_SAFE_SNPRINTF;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001533
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001534 /*
1535 * Optional extensions
1536 */
1537
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001538 if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS )
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001539 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001540 ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix,
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001541 crt->ca_istrue ? "true" : "false" );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001542 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001543
1544 if( crt->max_pathlen > 0 )
1545 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001546 ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001547 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001548 }
1549 }
1550
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001551 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001552 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001553 ret = mbedtls_snprintf( p, n, "\n%ssubject alt name : ", prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001554 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnardbce2b302014-04-01 13:43:28 +02001555
1556 if( ( ret = x509_info_subject_alt_name( &p, &n,
1557 &crt->subject_alt_names ) ) != 0 )
1558 return( ret );
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001559 }
1560
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001561 if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE )
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001562 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001563 ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001564 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnard919f8f52014-04-01 13:01:11 +02001565
1566 if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 )
1567 return( ret );
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001568 }
1569
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001570 if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE )
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001571 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001572 ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001573 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnard65c2ddc2014-04-01 14:12:11 +02001574
1575 if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 )
1576 return( ret );
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001577 }
1578
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001579 if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE )
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001580 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001581 ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001582 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnardf6f4ab42014-04-01 17:32:44 +02001583
1584 if( ( ret = x509_info_ext_key_usage( &p, &n,
1585 &crt->ext_key_usage ) ) != 0 )
1586 return( ret );
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001587 }
1588
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001589 ret = mbedtls_snprintf( p, n, "\n" );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001590 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnardb28487d2014-04-01 12:19:09 +02001591
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001592 return( (int) ( size - n ) );
1593}
1594
Manuel Pégourié-Gonnardb5f48ad2015-04-20 10:38:13 +01001595struct x509_crt_verify_string {
1596 int code;
1597 const char *string;
1598};
1599
1600static const struct x509_crt_verify_string x509_crt_verify_strings[] = {
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001601 { MBEDTLS_X509_BADCERT_EXPIRED, "The certificate validity has expired" },
Manuel Pégourié-Gonnardb5f48ad2015-04-20 10:38:13 +01001602 { MBEDTLS_X509_BADCERT_REVOKED, "The certificate has been revoked (is on a CRL)" },
1603 { MBEDTLS_X509_BADCERT_CN_MISMATCH, "The certificate Common Name (CN) does not match with the expected CN" },
1604 { MBEDTLS_X509_BADCERT_NOT_TRUSTED, "The certificate is not correctly signed by the trusted CA" },
1605 { MBEDTLS_X509_BADCRL_NOT_TRUSTED, "The CRL is not correctly signed by the trusted CA" },
1606 { MBEDTLS_X509_BADCRL_EXPIRED, "The CRL is expired" },
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001607 { MBEDTLS_X509_BADCERT_MISSING, "Certificate was missing" },
1608 { MBEDTLS_X509_BADCERT_SKIP_VERIFY, "Certificate verification was skipped" },
1609 { MBEDTLS_X509_BADCERT_OTHER, "Other reason (can be used by verify callback)" },
Manuel Pégourié-Gonnardb5f48ad2015-04-20 10:38:13 +01001610 { MBEDTLS_X509_BADCERT_FUTURE, "The certificate validity starts in the future" },
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001611 { MBEDTLS_X509_BADCRL_FUTURE, "The CRL is from the future" },
1612 { MBEDTLS_X509_BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" },
1613 { MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" },
1614 { MBEDTLS_X509_BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" },
Manuel Pégourié-Gonnard95051642015-06-15 10:39:46 +02001615 { MBEDTLS_X509_BADCERT_BAD_MD, "The certificate is signed with an unacceptable hash." },
1616 { MBEDTLS_X509_BADCERT_BAD_PK, "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." },
1617 { MBEDTLS_X509_BADCERT_BAD_KEY, "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." },
1618 { MBEDTLS_X509_BADCRL_BAD_MD, "The CRL is signed with an unacceptable hash." },
1619 { MBEDTLS_X509_BADCRL_BAD_PK, "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." },
1620 { MBEDTLS_X509_BADCRL_BAD_KEY, "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." },
Manuel Pégourié-Gonnardb5f48ad2015-04-20 10:38:13 +01001621 { 0, NULL }
1622};
1623
1624int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +02001625 uint32_t flags )
Manuel Pégourié-Gonnardb5f48ad2015-04-20 10:38:13 +01001626{
1627 int ret;
1628 const struct x509_crt_verify_string *cur;
1629 char *p = buf;
1630 size_t n = size;
1631
1632 for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ )
1633 {
1634 if( ( flags & cur->code ) == 0 )
1635 continue;
1636
1637 ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001638 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnardb5f48ad2015-04-20 10:38:13 +01001639 flags ^= cur->code;
1640 }
1641
1642 if( flags != 0 )
1643 {
1644 ret = mbedtls_snprintf( p, n, "%sUnknown reason "
1645 "(this should not happen)\n", prefix );
Manuel Pégourié-Gonnard16853682015-06-22 11:12:02 +02001646 MBEDTLS_X509_SAFE_SNPRINTF;
Manuel Pégourié-Gonnardb5f48ad2015-04-20 10:38:13 +01001647 }
1648
1649 return( (int) ( size - n ) );
1650}
Hanno Becker02a21932019-06-10 15:08:43 +01001651#endif /* !MBEDTLS_X509_REMOVE_INFO */
Manuel Pégourié-Gonnardb5f48ad2015-04-20 10:38:13 +01001652
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001653#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
Manuel Pégourié-Gonnard655a9642015-06-23 10:48:44 +02001654int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt,
1655 unsigned int usage )
Manuel Pégourié-Gonnard603116c2014-04-09 09:50:03 +02001656{
Manuel Pégourié-Gonnard655a9642015-06-23 10:48:44 +02001657 unsigned int usage_must, usage_may;
1658 unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY
1659 | MBEDTLS_X509_KU_DECIPHER_ONLY;
1660
1661 if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 )
1662 return( 0 );
1663
1664 usage_must = usage & ~may_mask;
1665
1666 if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must )
1667 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1668
1669 usage_may = usage & may_mask;
1670
1671 if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001672 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard603116c2014-04-09 09:50:03 +02001673
1674 return( 0 );
1675}
1676#endif
1677
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001678#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
1679int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
Hanno Beckere1956af2019-02-21 14:28:12 +00001680 const char *usage_oid,
1681 size_t usage_len )
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001682{
Hanno Beckere1956af2019-02-21 14:28:12 +00001683 int ret;
1684 size_t len;
1685 unsigned ext_types;
1686 unsigned char *p, *end;
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001687
1688 /* Extension is not mandatory, absent means no restriction */
Hanno Beckere1956af2019-02-21 14:28:12 +00001689 ext_types = crt->ext_types;
1690 if( ( ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) == 0 )
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001691 return( 0 );
1692
Hanno Beckere1956af2019-02-21 14:28:12 +00001693 p = crt->ext_key_usage_raw.p;
1694 end = p + crt->ext_key_usage_raw.len;
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001695
Hanno Beckere1956af2019-02-21 14:28:12 +00001696 ret = mbedtls_asn1_get_tag( &p, end, &len,
1697 MBEDTLS_ASN1_CONSTRUCTED |
1698 MBEDTLS_ASN1_SEQUENCE );
1699 if( ret != 0 )
1700 goto exit;
1701
1702 if( end != p + len )
1703 {
1704 ret = MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
1705 goto exit;
1706 }
1707
1708 if( len == 0 )
1709 {
1710 ret = MBEDTLS_ERR_ASN1_INVALID_LENGTH;
1711 goto exit;
1712 }
1713
1714 while( p < end )
1715 {
1716 ret = mbedtls_asn1_get_tag( &p, end, &len,
1717 MBEDTLS_ASN1_OID );
1718 if( ret != 0 )
1719 goto exit;
1720
1721 if( usage_oid != NULL )
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001722 {
Hanno Beckere1956af2019-02-21 14:28:12 +00001723 if( len == usage_len && memcmp( p, usage_oid, len ) == 0 )
1724 return( 0 );
1725
1726 if( MBEDTLS_OID_CMP_RAW( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE,
1727 p, len ) == 0 )
1728 {
1729 return( 0 );
1730 }
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001731 }
1732
Hanno Beckere1956af2019-02-21 14:28:12 +00001733 p += len;
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001734 }
1735
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001736 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
Hanno Beckere1956af2019-02-21 14:28:12 +00001737
1738exit:
1739 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001740}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001741#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
Manuel Pégourié-Gonnard7afb8a02014-04-10 17:53:56 +02001742
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001743#if defined(MBEDTLS_X509_CRL_PARSE_C)
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001744/*
1745 * Return 1 if the certificate is revoked, or 0 otherwise.
1746 */
Manuel Pégourié-Gonnardc730ed32015-06-02 10:38:50 +01001747int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001748{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001749 const mbedtls_x509_crl_entry *cur = &crl->entry;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001750
1751 while( cur != NULL && cur->serial.len != 0 )
1752 {
1753 if( crt->serial.len == cur->serial.len &&
1754 memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 )
1755 {
Manuel Pégourié-Gonnardc730ed32015-06-02 10:38:50 +01001756 if( mbedtls_x509_time_is_past( &cur->revocation_date ) )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001757 return( 1 );
1758 }
1759
1760 cur = cur->next;
1761 }
1762
1763 return( 0 );
1764}
1765
1766/*
Manuel Pégourié-Gonnardeeef9472016-02-22 11:36:55 +01001767 * Check that the given certificate is not revoked according to the CRL.
Manuel Pégourié-Gonnard08eacec2017-10-18 14:20:24 +02001768 * Skip validation if no CRL for the given CA is present.
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001769 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001770static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
Manuel Pégourié-Gonnard95051642015-06-15 10:39:46 +02001771 mbedtls_x509_crl *crl_list,
1772 const mbedtls_x509_crt_profile *profile )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001773{
1774 int flags = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001775 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
1776 const mbedtls_md_info_t *md_info;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001777
1778 if( ca == NULL )
1779 return( flags );
1780
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001781 while( crl_list != NULL )
1782 {
1783 if( crl_list->version == 0 ||
Hanno Becker7dee12a2019-02-21 13:58:38 +00001784 mbedtls_x509_name_cmp_raw( &crl_list->issuer_raw_no_hdr,
Hanno Becker67284cc2019-02-21 14:31:51 +00001785 &ca->subject_raw_no_hdr,
1786 NULL, NULL ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001787 {
1788 crl_list = crl_list->next;
1789 continue;
1790 }
1791
1792 /*
Manuel Pégourié-Gonnard99d4f192014-04-08 15:10:07 +02001793 * Check if the CA is configured to sign CRLs
1794 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001795#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
Hanno Beckerb75ffb52018-11-02 09:19:54 +00001796 if( mbedtls_x509_crt_check_key_usage( ca,
1797 MBEDTLS_X509_KU_CRL_SIGN ) != 0 )
Manuel Pégourié-Gonnard99d4f192014-04-08 15:10:07 +02001798 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001799 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
Manuel Pégourié-Gonnard99d4f192014-04-08 15:10:07 +02001800 break;
1801 }
1802#endif
1803
1804 /*
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001805 * Check if CRL is correctly signed by the trusted CA
1806 */
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +02001807 if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 )
1808 flags |= MBEDTLS_X509_BADCRL_BAD_MD;
1809
1810 if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 )
1811 flags |= MBEDTLS_X509_BADCRL_BAD_PK;
1812
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001813 md_info = mbedtls_md_info_from_type( crl_list->sig_md );
Manuel Pégourié-Gonnard329e78c2017-06-26 12:22:17 +02001814 if( mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001815 {
Manuel Pégourié-Gonnard329e78c2017-06-26 12:22:17 +02001816 /* Note: this can't happen except after an internal error */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001817 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001818 break;
1819 }
1820
Manuel Pégourié-Gonnard3f816912017-10-26 10:24:16 +02001821 if( x509_profile_check_key( profile, &ca->pk ) != 0 )
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +02001822 flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
Manuel Pégourié-Gonnard95051642015-06-15 10:39:46 +02001823
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001824 if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk,
1825 crl_list->sig_md, hash, mbedtls_md_get_size( md_info ),
Manuel Pégourié-Gonnard53882022014-06-05 17:53:52 +02001826 crl_list->sig.p, crl_list->sig.len ) != 0 )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001827 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001828 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001829 break;
1830 }
1831
1832 /*
1833 * Check for validity of CRL (Do not drop out)
1834 */
Manuel Pégourié-Gonnardc730ed32015-06-02 10:38:50 +01001835 if( mbedtls_x509_time_is_past( &crl_list->next_update ) )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001836 flags |= MBEDTLS_X509_BADCRL_EXPIRED;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001837
Manuel Pégourié-Gonnardc730ed32015-06-02 10:38:50 +01001838 if( mbedtls_x509_time_is_future( &crl_list->this_update ) )
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01001839 flags |= MBEDTLS_X509_BADCRL_FUTURE;
Manuel Pégourié-Gonnard95337652014-03-10 13:15:18 +01001840
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001841 /*
1842 * Check if certificate is revoked
1843 */
Manuel Pégourié-Gonnardc730ed32015-06-02 10:38:50 +01001844 if( mbedtls_x509_crt_is_revoked( crt, crl_list ) )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001845 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001846 flags |= MBEDTLS_X509_BADCERT_REVOKED;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001847 break;
1848 }
1849
1850 crl_list = crl_list->next;
1851 }
Manuel Pégourié-Gonnardcbb1f6e2015-06-15 16:17:55 +02001852
Paul Bakkerd8bb8262014-06-17 14:06:49 +02001853 return( flags );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001854}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001855#endif /* MBEDTLS_X509_CRL_PARSE_C */
Paul Bakker7c6b2c32013-09-16 13:49:26 +02001856
Manuel Pégourié-Gonnard88421242014-10-17 11:36:18 +02001857/*
Manuel Pégourié-Gonnardf82a4d52017-07-03 19:26:25 +02001858 * Check the signature of a certificate by its parent
1859 */
1860static int x509_crt_check_signature( const mbedtls_x509_crt *child,
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02001861 mbedtls_x509_crt *parent,
1862 mbedtls_x509_crt_restart_ctx *rs_ctx )
Manuel Pégourié-Gonnardf82a4d52017-07-03 19:26:25 +02001863{
1864 const mbedtls_md_info_t *md_info;
1865 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
1866
1867 md_info = mbedtls_md_info_from_type( child->sig_md );
1868 if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 )
1869 {
1870 /* Note: this can't happen except after an internal error */
1871 return( -1 );
1872 }
1873
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02001874 /* Skip expensive computation on obvious mismatch */
1875 if( ! mbedtls_pk_can_do( &parent->pk, child->sig_pk ) )
Manuel Pégourié-Gonnardf82a4d52017-07-03 19:26:25 +02001876 return( -1 );
Manuel Pégourié-Gonnardf82a4d52017-07-03 19:26:25 +02001877
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02001878#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02001879 if( rs_ctx != NULL && child->sig_pk == MBEDTLS_PK_ECDSA )
1880 {
1881 return( mbedtls_pk_verify_restartable( &parent->pk,
1882 child->sig_md, hash, mbedtls_md_get_size( md_info ),
Manuel Pégourié-Gonnard15d7df22017-08-17 14:33:31 +02001883 child->sig.p, child->sig.len, &rs_ctx->pk ) );
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02001884 }
1885#else
1886 (void) rs_ctx;
1887#endif
1888
1889 return( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk,
1890 child->sig_md, hash, mbedtls_md_get_size( md_info ),
1891 child->sig.p, child->sig.len ) );
Manuel Pégourié-Gonnardf82a4d52017-07-03 19:26:25 +02001892}
1893
1894/*
Manuel Pégourié-Gonnard312010e2014-04-09 14:30:11 +02001895 * Check if 'parent' is a suitable parent (signing CA) for 'child'.
1896 * Return 0 if yes, -1 if not.
Manuel Pégourié-Gonnardd249b7a2014-06-24 11:49:16 +02001897 *
1898 * top means parent is a locally-trusted certificate
Manuel Pégourié-Gonnard3fed0b32014-04-08 13:18:01 +02001899 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001900static int x509_crt_check_parent( const mbedtls_x509_crt *child,
1901 const mbedtls_x509_crt *parent,
Manuel Pégourié-Gonnard27e94792017-07-04 00:49:31 +02001902 int top )
Manuel Pégourié-Gonnard3fed0b32014-04-08 13:18:01 +02001903{
Manuel Pégourié-Gonnardd249b7a2014-06-24 11:49:16 +02001904 int need_ca_bit;
1905
Manuel Pégourié-Gonnardc4eff162014-06-19 12:18:08 +02001906 /* Parent must be the issuer */
Hanno Becker7dee12a2019-02-21 13:58:38 +00001907 if( mbedtls_x509_name_cmp_raw( &child->issuer_raw_no_hdr,
Hanno Becker67284cc2019-02-21 14:31:51 +00001908 &parent->subject_raw_no_hdr,
1909 NULL, NULL ) != 0 )
Hanno Becker7dee12a2019-02-21 13:58:38 +00001910 {
Manuel Pégourié-Gonnard312010e2014-04-09 14:30:11 +02001911 return( -1 );
Hanno Becker7dee12a2019-02-21 13:58:38 +00001912 }
Manuel Pégourié-Gonnard3fed0b32014-04-08 13:18:01 +02001913
Manuel Pégourié-Gonnardd249b7a2014-06-24 11:49:16 +02001914 /* Parent must have the basicConstraints CA bit set as a general rule */
1915 need_ca_bit = 1;
1916
1917 /* Exception: v1/v2 certificates that are locally trusted. */
1918 if( top && parent->version < 3 )
1919 need_ca_bit = 0;
1920
Manuel Pégourié-Gonnardd249b7a2014-06-24 11:49:16 +02001921 if( need_ca_bit && ! parent->ca_istrue )
1922 return( -1 );
1923
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001924#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
Manuel Pégourié-Gonnardd249b7a2014-06-24 11:49:16 +02001925 if( need_ca_bit &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001926 mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 )
Manuel Pégourié-Gonnardc4eff162014-06-19 12:18:08 +02001927 {
1928 return( -1 );
1929 }
Manuel Pégourié-Gonnard312010e2014-04-09 14:30:11 +02001930#endif
1931
1932 return( 0 );
Manuel Pégourié-Gonnard3fed0b32014-04-08 13:18:01 +02001933}
1934
Manuel Pégourié-Gonnard35407c72017-06-29 10:45:25 +02001935/*
Manuel Pégourié-Gonnard3e329b82017-06-29 12:55:27 +02001936 * Find a suitable parent for child in candidates, or return NULL.
1937 *
1938 * Here suitable is defined as:
Manuel Pégourié-Gonnard2f09d592017-07-03 18:30:43 +02001939 * 1. subject name matches child's issuer
1940 * 2. if necessary, the CA bit is set and key usage allows signing certs
1941 * 3. for trusted roots, the signature is correct
Manuel Pégourié-Gonnardbe4ff422017-07-14 12:04:14 +02001942 * (for intermediates, the signature is checked and the result reported)
Manuel Pégourié-Gonnard2f09d592017-07-03 18:30:43 +02001943 * 4. pathlen constraints are satisfied
Manuel Pégourié-Gonnard3e329b82017-06-29 12:55:27 +02001944 *
Manuel Pégourié-Gonnard562df402017-08-08 18:09:14 +02001945 * If there's a suitable candidate which is also time-valid, return the first
1946 * such. Otherwise, return the first suitable candidate (or NULL if there is
1947 * none).
Manuel Pégourié-Gonnard3e329b82017-06-29 12:55:27 +02001948 *
1949 * The rationale for this rule is that someone could have a list of trusted
1950 * roots with two versions on the same root with different validity periods.
1951 * (At least one user reported having such a list and wanted it to just work.)
1952 * The reason we don't just require time-validity is that generally there is
1953 * only one version, and if it's expired we want the flags to state that
1954 * rather than NOT_TRUSTED, as would be the case if we required it here.
Manuel Pégourié-Gonnard2f09d592017-07-03 18:30:43 +02001955 *
1956 * The rationale for rule 3 (signature for trusted roots) is that users might
1957 * have two versions of the same CA with different keys in their list, and the
Manuel Pégourié-Gonnardbdc54402017-07-04 00:33:39 +02001958 * way we select the correct one is by checking the signature (as we don't
1959 * rely on key identifier extensions). (This is one way users might choose to
1960 * handle key rollover, another relies on self-issued certs, see [SIRO].)
Manuel Pégourié-Gonnard98a67782017-08-17 10:52:20 +02001961 *
1962 * Arguments:
Manuel Pégourié-Gonnarde57d7432018-03-07 10:00:57 +01001963 * - [in] child: certificate for which we're looking for a parent
1964 * - [in] candidates: chained list of potential parents
Manuel Pégourié-Gonnardda19f4c2018-06-12 12:40:54 +02001965 * - [out] r_parent: parent found (or NULL)
1966 * - [out] r_signature_is_good: 1 if child signature by parent is valid, or 0
Manuel Pégourié-Gonnarde57d7432018-03-07 10:00:57 +01001967 * - [in] top: 1 if candidates consists of trusted roots, ie we're at the top
1968 * of the chain, 0 otherwise
1969 * - [in] path_cnt: number of intermediates seen so far
1970 * - [in] self_cnt: number of self-signed intermediates seen so far
1971 * (will never be greater than path_cnt)
Manuel Pégourié-Gonnardda19f4c2018-06-12 12:40:54 +02001972 * - [in-out] rs_ctx: context for restarting operations
Manuel Pégourié-Gonnarde57d7432018-03-07 10:00:57 +01001973 *
1974 * Return value:
Manuel Pégourié-Gonnardda19f4c2018-06-12 12:40:54 +02001975 * - 0 on success
1976 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise
Manuel Pégourié-Gonnard2f1c33d2017-06-29 12:27:23 +02001977 */
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02001978static int x509_crt_find_parent_in(
1979 mbedtls_x509_crt *child,
1980 mbedtls_x509_crt *candidates,
1981 mbedtls_x509_crt **r_parent,
1982 int *r_signature_is_good,
1983 int top,
Manuel Pégourié-Gonnardbb216bd2017-08-28 13:25:55 +02001984 unsigned path_cnt,
1985 unsigned self_cnt,
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02001986 mbedtls_x509_crt_restart_ctx *rs_ctx )
Manuel Pégourié-Gonnard2f1c33d2017-06-29 12:27:23 +02001987{
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02001988 int ret;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02001989 mbedtls_x509_crt *parent, *fallback_parent;
Manuel Pégourié-Gonnard78d7e8c2018-07-02 12:33:14 +02001990 int signature_is_good, fallback_signature_is_good;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02001991
1992#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
Manuel Pégourié-Gonnard3627a8b2017-08-23 11:20:48 +02001993 /* did we have something in progress? */
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02001994 if( rs_ctx != NULL && rs_ctx->parent != NULL )
1995 {
Manuel Pégourié-Gonnard3627a8b2017-08-23 11:20:48 +02001996 /* restore saved state */
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02001997 parent = rs_ctx->parent;
1998 fallback_parent = rs_ctx->fallback_parent;
Manuel Pégourié-Gonnard78d7e8c2018-07-02 12:33:14 +02001999 fallback_signature_is_good = rs_ctx->fallback_signature_is_good;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002000
Manuel Pégourié-Gonnard3627a8b2017-08-23 11:20:48 +02002001 /* clear saved state */
2002 rs_ctx->parent = NULL;
2003 rs_ctx->fallback_parent = NULL;
Manuel Pégourié-Gonnard78d7e8c2018-07-02 12:33:14 +02002004 rs_ctx->fallback_signature_is_good = 0;
Manuel Pégourié-Gonnard3627a8b2017-08-23 11:20:48 +02002005
2006 /* resume where we left */
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002007 goto check_signature;
2008 }
2009#endif
2010
2011 fallback_parent = NULL;
Manuel Pégourié-Gonnard78d7e8c2018-07-02 12:33:14 +02002012 fallback_signature_is_good = 0;
Manuel Pégourié-Gonnard2f1c33d2017-06-29 12:27:23 +02002013
Manuel Pégourié-Gonnard2f1c33d2017-06-29 12:27:23 +02002014 for( parent = candidates; parent != NULL; parent = parent->next )
2015 {
Manuel Pégourié-Gonnard2f09d592017-07-03 18:30:43 +02002016 /* basic parenting skills (name, CA bit, key usage) */
Manuel Pégourié-Gonnard27e94792017-07-04 00:49:31 +02002017 if( x509_crt_check_parent( child, parent, top ) != 0 )
Manuel Pégourié-Gonnard2f1c33d2017-06-29 12:27:23 +02002018 continue;
2019
Manuel Pégourié-Gonnard9c6118c2017-06-29 12:38:42 +02002020 /* +1 because stored max_pathlen is 1 higher that the actual value */
2021 if( parent->max_pathlen > 0 &&
Manuel Pégourié-Gonnardbb216bd2017-08-28 13:25:55 +02002022 (size_t) parent->max_pathlen < 1 + path_cnt - self_cnt )
Manuel Pégourié-Gonnard9c6118c2017-06-29 12:38:42 +02002023 {
2024 continue;
2025 }
2026
Manuel Pégourié-Gonnard2f09d592017-07-03 18:30:43 +02002027 /* Signature */
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002028#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2029check_signature:
2030#endif
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002031 ret = x509_crt_check_signature( child, parent, rs_ctx );
2032
2033#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002034 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2035 {
2036 /* save state */
2037 rs_ctx->parent = parent;
2038 rs_ctx->fallback_parent = fallback_parent;
Manuel Pégourié-Gonnard78d7e8c2018-07-02 12:33:14 +02002039 rs_ctx->fallback_signature_is_good = fallback_signature_is_good;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002040
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002041 return( ret );
2042 }
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002043#else
2044 (void) ret;
2045#endif
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002046
2047 signature_is_good = ret == 0;
2048 if( top && ! signature_is_good )
Manuel Pégourié-Gonnardf82a4d52017-07-03 19:26:25 +02002049 continue;
Manuel Pégourié-Gonnard2f09d592017-07-03 18:30:43 +02002050
Manuel Pégourié-Gonnard562df402017-08-08 18:09:14 +02002051 /* optional time check */
Manuel Pégourié-Gonnard3e329b82017-06-29 12:55:27 +02002052 if( mbedtls_x509_time_is_past( &parent->valid_to ) ||
2053 mbedtls_x509_time_is_future( &parent->valid_from ) )
2054 {
Manuel Pégourié-Gonnardbe4ff422017-07-14 12:04:14 +02002055 if( fallback_parent == NULL )
2056 {
2057 fallback_parent = parent;
Manuel Pégourié-Gonnard78d7e8c2018-07-02 12:33:14 +02002058 fallback_signature_is_good = signature_is_good;
Manuel Pégourié-Gonnardbe4ff422017-07-14 12:04:14 +02002059 }
Manuel Pégourié-Gonnard3e329b82017-06-29 12:55:27 +02002060
2061 continue;
2062 }
2063
Manuel Pégourié-Gonnard2f1c33d2017-06-29 12:27:23 +02002064 break;
2065 }
2066
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002067 if( parent != NULL )
Manuel Pégourié-Gonnardbe4ff422017-07-14 12:04:14 +02002068 {
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002069 *r_parent = parent;
2070 *r_signature_is_good = signature_is_good;
2071 }
2072 else
2073 {
2074 *r_parent = fallback_parent;
Manuel Pégourié-Gonnard78d7e8c2018-07-02 12:33:14 +02002075 *r_signature_is_good = fallback_signature_is_good;
Manuel Pégourié-Gonnardbe4ff422017-07-14 12:04:14 +02002076 }
Manuel Pégourié-Gonnard3e329b82017-06-29 12:55:27 +02002077
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002078 return( 0 );
Manuel Pégourié-Gonnard2f1c33d2017-06-29 12:27:23 +02002079}
2080
2081/*
Manuel Pégourié-Gonnard63686122017-07-04 01:01:39 +02002082 * Find a parent in trusted CAs or the provided chain, or return NULL.
2083 *
2084 * Searches in trusted CAs first, and return the first suitable parent found
2085 * (see find_parent_in() for definition of suitable).
Manuel Pégourié-Gonnard98a67782017-08-17 10:52:20 +02002086 *
2087 * Arguments:
Manuel Pégourié-Gonnarde57d7432018-03-07 10:00:57 +01002088 * - [in] child: certificate for which we're looking for a parent, followed
2089 * by a chain of possible intermediates
Manuel Pégourié-Gonnardda19f4c2018-06-12 12:40:54 +02002090 * - [in] trust_ca: list of locally trusted certificates
2091 * - [out] parent: parent found (or NULL)
2092 * - [out] parent_is_trusted: 1 if returned `parent` is trusted, or 0
2093 * - [out] signature_is_good: 1 if child signature by parent is valid, or 0
2094 * - [in] path_cnt: number of links in the chain so far (EE -> ... -> child)
2095 * - [in] self_cnt: number of self-signed certs in the chain so far
Manuel Pégourié-Gonnarde57d7432018-03-07 10:00:57 +01002096 * (will always be no greater than path_cnt)
Manuel Pégourié-Gonnardda19f4c2018-06-12 12:40:54 +02002097 * - [in-out] rs_ctx: context for restarting operations
Manuel Pégourié-Gonnarde57d7432018-03-07 10:00:57 +01002098 *
2099 * Return value:
Manuel Pégourié-Gonnardda19f4c2018-06-12 12:40:54 +02002100 * - 0 on success
2101 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise
Manuel Pégourié-Gonnard63686122017-07-04 01:01:39 +02002102 */
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002103static int x509_crt_find_parent(
2104 mbedtls_x509_crt *child,
2105 mbedtls_x509_crt *trust_ca,
2106 mbedtls_x509_crt **parent,
2107 int *parent_is_trusted,
2108 int *signature_is_good,
Manuel Pégourié-Gonnardbb216bd2017-08-28 13:25:55 +02002109 unsigned path_cnt,
2110 unsigned self_cnt,
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002111 mbedtls_x509_crt_restart_ctx *rs_ctx )
Manuel Pégourié-Gonnard63686122017-07-04 01:01:39 +02002112{
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002113 int ret;
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002114 mbedtls_x509_crt *search_list;
Manuel Pégourié-Gonnard63686122017-07-04 01:01:39 +02002115
Manuel Pégourié-Gonnard63686122017-07-04 01:01:39 +02002116 *parent_is_trusted = 1;
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002117
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002118#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
Manuel Pégourié-Gonnard3627a8b2017-08-23 11:20:48 +02002119 /* restore then clear saved state if we have some stored */
2120 if( rs_ctx != NULL && rs_ctx->parent_is_trusted != -1 )
2121 {
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002122 *parent_is_trusted = rs_ctx->parent_is_trusted;
Manuel Pégourié-Gonnard3627a8b2017-08-23 11:20:48 +02002123 rs_ctx->parent_is_trusted = -1;
2124 }
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002125#endif
2126
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002127 while( 1 ) {
2128 search_list = *parent_is_trusted ? trust_ca : child->next;
2129
2130 ret = x509_crt_find_parent_in( child, search_list,
2131 parent, signature_is_good,
2132 *parent_is_trusted,
2133 path_cnt, self_cnt, rs_ctx );
Manuel Pégourié-Gonnard63686122017-07-04 01:01:39 +02002134
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002135#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002136 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2137 {
2138 /* save state */
2139 rs_ctx->parent_is_trusted = *parent_is_trusted;
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002140 return( ret );
2141 }
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002142#else
2143 (void) ret;
2144#endif
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002145
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002146 /* stop here if found or already in second iteration */
2147 if( *parent != NULL || *parent_is_trusted == 0 )
2148 break;
Manuel Pégourié-Gonnard63686122017-07-04 01:01:39 +02002149
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002150 /* prepare second iteration */
2151 *parent_is_trusted = 0;
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002152 }
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002153
2154 /* extra precaution against mistakes in the caller */
Krzysztof Stachowiakc388a8c2018-10-31 16:49:20 +01002155 if( *parent == NULL )
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002156 {
Manuel Pégourié-Gonnarda5a3e402018-10-16 11:27:23 +02002157 *parent_is_trusted = 0;
2158 *signature_is_good = 0;
Manuel Pégourié-Gonnard18547b52017-08-14 16:11:43 +02002159 }
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002160
2161 return( 0 );
Manuel Pégourié-Gonnard63686122017-07-04 01:01:39 +02002162}
2163
2164/*
Manuel Pégourié-Gonnard27e94792017-07-04 00:49:31 +02002165 * Check if an end-entity certificate is locally trusted
2166 *
2167 * Currently we require such certificates to be self-signed (actually only
2168 * check for self-issued as self-signatures are not checked)
2169 */
2170static int x509_crt_check_ee_locally_trusted(
2171 mbedtls_x509_crt *crt,
2172 mbedtls_x509_crt *trust_ca )
2173{
2174 mbedtls_x509_crt *cur;
2175
2176 /* must be self-issued */
Hanno Becker7dee12a2019-02-21 13:58:38 +00002177 if( mbedtls_x509_name_cmp_raw( &crt->issuer_raw_no_hdr,
Hanno Becker67284cc2019-02-21 14:31:51 +00002178 &crt->subject_raw_no_hdr,
2179 NULL, NULL ) != 0 )
Hanno Becker7dee12a2019-02-21 13:58:38 +00002180 {
Manuel Pégourié-Gonnard27e94792017-07-04 00:49:31 +02002181 return( -1 );
Hanno Becker7dee12a2019-02-21 13:58:38 +00002182 }
Manuel Pégourié-Gonnard27e94792017-07-04 00:49:31 +02002183
2184 /* look for an exact match with trusted cert */
2185 for( cur = trust_ca; cur != NULL; cur = cur->next )
2186 {
2187 if( crt->raw.len == cur->raw.len &&
2188 memcmp( crt->raw.p, cur->raw.p, crt->raw.len ) == 0 )
2189 {
2190 return( 0 );
2191 }
2192 }
2193
2194 /* too bad */
2195 return( -1 );
2196}
2197
2198/*
Manuel Pégourié-Gonnardf86f4912017-07-05 16:43:44 +02002199 * Build and verify a certificate chain
Manuel Pégourié-Gonnard35407c72017-06-29 10:45:25 +02002200 *
Manuel Pégourié-Gonnardf86f4912017-07-05 16:43:44 +02002201 * Given a peer-provided list of certificates EE, C1, ..., Cn and
2202 * a list of trusted certs R1, ... Rp, try to build and verify a chain
Manuel Pégourié-Gonnard562df402017-08-08 18:09:14 +02002203 * EE, Ci1, ... Ciq [, Rj]
Manuel Pégourié-Gonnardf86f4912017-07-05 16:43:44 +02002204 * such that every cert in the chain is a child of the next one,
2205 * jumping to a trusted root as early as possible.
Manuel Pégourié-Gonnardbdc54402017-07-04 00:33:39 +02002206 *
Manuel Pégourié-Gonnardf86f4912017-07-05 16:43:44 +02002207 * Verify that chain and return it with flags for all issues found.
2208 *
2209 * Special cases:
2210 * - EE == Rj -> return a one-element list containing it
2211 * - EE, Ci1, ..., Ciq cannot be continued with a trusted root
2212 * -> return that chain with NOT_TRUSTED set on Ciq
Manuel Pégourié-Gonnardbdc54402017-07-04 00:33:39 +02002213 *
Manuel Pégourié-Gonnardd19a41d2017-07-14 11:05:59 +02002214 * Tests for (aspects of) this function should include at least:
2215 * - trusted EE
2216 * - EE -> trusted root
2217 * - EE -> intermedate CA -> trusted root
2218 * - if relevant: EE untrusted
2219 * - if relevant: EE -> intermediate, untrusted
2220 * with the aspect under test checked at each relevant level (EE, int, root).
2221 * For some aspects longer chains are required, but usually length 2 is
2222 * enough (but length 1 is not in general).
2223 *
Manuel Pégourié-Gonnardbdc54402017-07-04 00:33:39 +02002224 * Arguments:
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002225 * - [in] crt: the cert list EE, C1, ..., Cn
2226 * - [in] trust_ca: the trusted list R1, ..., Rp
2227 * - [in] ca_crl, profile: as in verify_with_profile()
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002228 * - [out] ver_chain: the built and verified chain
Manuel Pégourié-Gonnarda9688432017-08-23 11:23:59 +02002229 * Only valid when return value is 0, may contain garbage otherwise!
2230 * Restart note: need not be the same when calling again to resume.
Manuel Pégourié-Gonnard98a67782017-08-17 10:52:20 +02002231 * - [in-out] rs_ctx: context for restarting operations
Manuel Pégourié-Gonnardf86f4912017-07-05 16:43:44 +02002232 *
2233 * Return value:
2234 * - non-zero if the chain could not be fully built and examined
2235 * - 0 is the chain was successfully built and examined,
2236 * even if it was found to be invalid
Manuel Pégourié-Gonnard35407c72017-06-29 10:45:25 +02002237 */
Manuel Pégourié-Gonnardbdc54402017-07-04 00:33:39 +02002238static int x509_crt_verify_chain(
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002239 mbedtls_x509_crt *crt,
2240 mbedtls_x509_crt *trust_ca,
2241 mbedtls_x509_crl *ca_crl,
Manuel Pégourié-Gonnard95051642015-06-15 10:39:46 +02002242 const mbedtls_x509_crt_profile *profile,
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002243 mbedtls_x509_crt_verify_chain *ver_chain,
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002244 mbedtls_x509_crt_restart_ctx *rs_ctx )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002245{
Manuel Pégourié-Gonnarda9688432017-08-23 11:23:59 +02002246 /* Don't initialize any of those variables here, so that the compiler can
2247 * catch potential issues with jumping ahead when restarting */
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002248 int ret;
Manuel Pégourié-Gonnardf86f4912017-07-05 16:43:44 +02002249 uint32_t *flags;
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002250 mbedtls_x509_crt_verify_chain_item *cur;
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002251 mbedtls_x509_crt *child;
Manuel Pégourié-Gonnard58dcd2d2017-07-03 21:35:04 +02002252 mbedtls_x509_crt *parent;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002253 int parent_is_trusted;
2254 int child_is_trusted;
2255 int signature_is_good;
Manuel Pégourié-Gonnardbb216bd2017-08-28 13:25:55 +02002256 unsigned self_cnt;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002257
2258#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2259 /* resume if we had an operation in progress */
Manuel Pégourié-Gonnarddaf04912017-08-23 12:32:19 +02002260 if( rs_ctx != NULL && rs_ctx->in_progress == x509_crt_rs_find_parent )
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002261 {
Manuel Pégourié-Gonnard3627a8b2017-08-23 11:20:48 +02002262 /* restore saved state */
Manuel Pégourié-Gonnarda9688432017-08-23 11:23:59 +02002263 *ver_chain = rs_ctx->ver_chain; /* struct copy */
Manuel Pégourié-Gonnarddaf04912017-08-23 12:32:19 +02002264 self_cnt = rs_ctx->self_cnt;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002265
Manuel Pégourié-Gonnarddaf04912017-08-23 12:32:19 +02002266 /* restore derived state */
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002267 cur = &ver_chain->items[ver_chain->len - 1];
Manuel Pégourié-Gonnarddaf04912017-08-23 12:32:19 +02002268 child = cur->crt;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002269 flags = &cur->flags;
2270
2271 goto find_parent;
2272 }
2273#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
Manuel Pégourié-Gonnard8f8c2822017-07-03 21:25:10 +02002274
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002275 child = crt;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002276 self_cnt = 0;
2277 parent_is_trusted = 0;
2278 child_is_trusted = 0;
Manuel Pégourié-Gonnardf86f4912017-07-05 16:43:44 +02002279
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002280 while( 1 ) {
2281 /* Add certificate to the verification chain */
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002282 cur = &ver_chain->items[ver_chain->len];
2283 cur->crt = child;
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002284 cur->flags = 0;
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002285 ver_chain->len++;
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002286 flags = &cur->flags;
Manuel Pégourié-Gonnard66fac752017-07-03 21:39:21 +02002287
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002288 /* Check time-validity (all certificates) */
2289 if( mbedtls_x509_time_is_past( &child->valid_to ) )
2290 *flags |= MBEDTLS_X509_BADCERT_EXPIRED;
Manuel Pégourié-Gonnard66fac752017-07-03 21:39:21 +02002291
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002292 if( mbedtls_x509_time_is_future( &child->valid_from ) )
2293 *flags |= MBEDTLS_X509_BADCERT_FUTURE;
Manuel Pégourié-Gonnardcb396102017-07-04 00:00:24 +02002294
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002295 /* Stop here for trusted roots (but not for trusted EE certs) */
2296 if( child_is_trusted )
2297 return( 0 );
Manuel Pégourié-Gonnard66fac752017-07-03 21:39:21 +02002298
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002299 /* Check signature algorithm: MD & PK algs */
2300 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 )
2301 *flags |= MBEDTLS_X509_BADCERT_BAD_MD;
Manuel Pégourié-Gonnard66fac752017-07-03 21:39:21 +02002302
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002303 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 )
2304 *flags |= MBEDTLS_X509_BADCERT_BAD_PK;
Manuel Pégourié-Gonnard27e94792017-07-04 00:49:31 +02002305
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002306 /* Special case: EE certs that are locally trusted */
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002307 if( ver_chain->len == 1 &&
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002308 x509_crt_check_ee_locally_trusted( child, trust_ca ) == 0 )
2309 {
2310 return( 0 );
2311 }
Manuel Pégourié-Gonnard8f8c2822017-07-03 21:25:10 +02002312
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002313#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2314find_parent:
2315#endif
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002316 /* Look for a parent in trusted CAs or up the chain */
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002317 ret = x509_crt_find_parent( child, trust_ca, &parent,
Manuel Pégourié-Gonnardbe4ff422017-07-14 12:04:14 +02002318 &parent_is_trusted, &signature_is_good,
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002319 ver_chain->len - 1, self_cnt, rs_ctx );
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002320
2321#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002322 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2323 {
2324 /* save state */
Manuel Pégourié-Gonnarddaf04912017-08-23 12:32:19 +02002325 rs_ctx->in_progress = x509_crt_rs_find_parent;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002326 rs_ctx->self_cnt = self_cnt;
Manuel Pégourié-Gonnarda9688432017-08-23 11:23:59 +02002327 rs_ctx->ver_chain = *ver_chain; /* struct copy */
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002328
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002329 return( ret );
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002330 }
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002331#else
2332 (void) ret;
2333#endif
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002334
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002335 /* No parent? We're done here */
2336 if( parent == NULL )
2337 {
2338 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2339 return( 0 );
2340 }
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002341
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002342 /* Count intermediate self-issued (not necessarily self-signed) certs.
2343 * These can occur with some strategies for key rollover, see [SIRO],
2344 * and should be excluded from max_pathlen checks. */
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002345 if( ver_chain->len != 1 &&
Hanno Becker7dee12a2019-02-21 13:58:38 +00002346 mbedtls_x509_name_cmp_raw( &child->issuer_raw_no_hdr,
Hanno Becker67284cc2019-02-21 14:31:51 +00002347 &child->subject_raw_no_hdr,
2348 NULL, NULL ) == 0 )
Manuel Pégourié-Gonnard24611f92017-08-09 10:28:07 +02002349 {
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002350 self_cnt++;
Manuel Pégourié-Gonnard24611f92017-08-09 10:28:07 +02002351 }
Manuel Pégourié-Gonnardfd6c85c2014-11-20 16:34:20 +01002352
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002353 /* path_cnt is 0 for the first intermediate CA,
2354 * and if parent is trusted it's not an intermediate CA */
2355 if( ! parent_is_trusted &&
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002356 ver_chain->len > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002357 {
2358 /* return immediately to avoid overflow the chain array */
2359 return( MBEDTLS_ERR_X509_FATAL_ERROR );
2360 }
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002361
Manuel Pégourié-Gonnard98a67782017-08-17 10:52:20 +02002362 /* signature was checked while searching parent */
Manuel Pégourié-Gonnardbe4ff422017-07-14 12:04:14 +02002363 if( ! signature_is_good )
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002364 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2365
2366 /* check size of signing key */
Manuel Pégourié-Gonnard3f816912017-10-26 10:24:16 +02002367 if( x509_profile_check_key( profile, &parent->pk ) != 0 )
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002368 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002369
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002370#if defined(MBEDTLS_X509_CRL_PARSE_C)
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002371 /* Check trusted CA's CRL for the given crt */
Manuel Pégourié-Gonnard562df402017-08-08 18:09:14 +02002372 *flags |= x509_crt_verifycrl( child, parent, ca_crl, profile );
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002373#else
2374 (void) ca_crl;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002375#endif
2376
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002377 /* prepare for next iteration */
2378 child = parent;
2379 parent = NULL;
2380 child_is_trusted = parent_is_trusted;
Manuel Pégourié-Gonnardbe4ff422017-07-14 12:04:14 +02002381 signature_is_good = 0;
Manuel Pégourié-Gonnardce6e52f2017-07-05 17:05:03 +02002382 }
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002383}
2384
2385/*
Manuel Pégourié-Gonnarda468eb12017-07-04 01:31:59 +02002386 * Check for CN match
2387 */
2388static int x509_crt_check_cn( const mbedtls_x509_buf *name,
2389 const char *cn, size_t cn_len )
2390{
2391 /* try exact match */
2392 if( name->len == cn_len &&
Hanno Becker88de3422019-02-20 12:41:55 +00002393 mbedtls_x509_memcasecmp( cn, name->p, cn_len ) == 0 )
Manuel Pégourié-Gonnarda468eb12017-07-04 01:31:59 +02002394 {
2395 return( 0 );
2396 }
2397
2398 /* try wildcard match */
Manuel Pégourié-Gonnard900fba62017-10-18 14:28:11 +02002399 if( x509_check_wildcard( cn, name ) == 0 )
Manuel Pégourié-Gonnarda468eb12017-07-04 01:31:59 +02002400 {
2401 return( 0 );
2402 }
2403
2404 return( -1 );
2405}
2406
Hanno Becker8b543b32019-02-21 11:50:44 +00002407/* Returns 1 on a match and 0 on a mismatch.
2408 * This is because this function is used as a callback for
2409 * mbedtls_x509_name_cmp_raw(), which continues the name
2410 * traversal as long as the callback returns 0. */
2411static int x509_crt_check_name( void *ctx,
2412 mbedtls_x509_buf *oid,
2413 mbedtls_x509_buf *val )
2414{
2415 char const *cn = (char const*) ctx;
2416 size_t cn_len = strlen( cn );
2417
2418 if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, oid ) == 0 &&
2419 x509_crt_check_cn( val, cn, cn_len ) == 0 )
2420 {
2421 return( 1 );
2422 }
2423
2424 return( 0 );
2425}
2426
Manuel Pégourié-Gonnarda468eb12017-07-04 01:31:59 +02002427/*
Manuel Pégourié-Gonnard1300e992017-07-04 01:13:44 +02002428 * Verify the requested CN - only call this if cn is not NULL!
2429 */
Manuel Pégourié-Gonnarda468eb12017-07-04 01:31:59 +02002430static void x509_crt_verify_name( const mbedtls_x509_crt *crt,
Manuel Pégourié-Gonnard1300e992017-07-04 01:13:44 +02002431 const char *cn,
2432 uint32_t *flags )
2433{
Manuel Pégourié-Gonnarda468eb12017-07-04 01:31:59 +02002434 const mbedtls_x509_sequence *cur;
2435 size_t cn_len = strlen( cn );
Manuel Pégourié-Gonnard1300e992017-07-04 01:13:44 +02002436
2437 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
2438 {
Manuel Pégourié-Gonnarda468eb12017-07-04 01:31:59 +02002439 for( cur = &crt->subject_alt_names; cur != NULL; cur = cur->next )
Manuel Pégourié-Gonnard1300e992017-07-04 01:13:44 +02002440 {
Manuel Pégourié-Gonnarda468eb12017-07-04 01:31:59 +02002441 if( x509_crt_check_cn( &cur->buf, cn, cn_len ) == 0 )
Manuel Pégourié-Gonnard1300e992017-07-04 01:13:44 +02002442 break;
Manuel Pégourié-Gonnard1300e992017-07-04 01:13:44 +02002443 }
2444
2445 if( cur == NULL )
2446 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
2447 }
2448 else
2449 {
Hanno Becker8b543b32019-02-21 11:50:44 +00002450 int ret;
2451 ret = mbedtls_x509_name_cmp_raw( &crt->subject_raw_no_hdr,
2452 &crt->subject_raw_no_hdr,
2453 x509_crt_check_name, (void*) cn );
2454 if( ret != 1 )
Manuel Pégourié-Gonnard1300e992017-07-04 01:13:44 +02002455 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
2456 }
2457}
2458
2459/*
Manuel Pégourié-Gonnarda707e1d2017-07-05 17:18:42 +02002460 * Merge the flags for all certs in the chain, after calling callback
2461 */
2462static int x509_crt_merge_flags_with_cb(
2463 uint32_t *flags,
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002464 const mbedtls_x509_crt_verify_chain *ver_chain,
Manuel Pégourié-Gonnarda707e1d2017-07-05 17:18:42 +02002465 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
2466 void *p_vrfy )
2467{
2468 int ret;
Manuel Pégourié-Gonnardbb216bd2017-08-28 13:25:55 +02002469 unsigned i;
Manuel Pégourié-Gonnarda707e1d2017-07-05 17:18:42 +02002470 uint32_t cur_flags;
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002471 const mbedtls_x509_crt_verify_chain_item *cur;
Manuel Pégourié-Gonnarda707e1d2017-07-05 17:18:42 +02002472
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002473 for( i = ver_chain->len; i != 0; --i )
Manuel Pégourié-Gonnarda707e1d2017-07-05 17:18:42 +02002474 {
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002475 cur = &ver_chain->items[i-1];
2476 cur_flags = cur->flags;
Manuel Pégourié-Gonnarda707e1d2017-07-05 17:18:42 +02002477
2478 if( NULL != f_vrfy )
Manuel Pégourié-Gonnardbb216bd2017-08-28 13:25:55 +02002479 if( ( ret = f_vrfy( p_vrfy, cur->crt, (int) i-1, &cur_flags ) ) != 0 )
Manuel Pégourié-Gonnarda707e1d2017-07-05 17:18:42 +02002480 return( ret );
2481
2482 *flags |= cur_flags;
2483 }
2484
2485 return( 0 );
2486}
2487
2488/*
Manuel Pégourié-Gonnardbc3f44a2017-07-11 11:02:20 +02002489 * Verify the certificate validity (default profile, not restartable)
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002490 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002491int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
2492 mbedtls_x509_crt *trust_ca,
2493 mbedtls_x509_crl *ca_crl,
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +02002494 const char *cn, uint32_t *flags,
2495 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
Paul Bakkerddf26b42013-09-18 13:46:23 +02002496 void *p_vrfy )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002497{
Manuel Pégourié-Gonnardbc3f44a2017-07-11 11:02:20 +02002498 return( mbedtls_x509_crt_verify_restartable( crt, trust_ca, ca_crl,
2499 &mbedtls_x509_crt_profile_default, cn, flags,
2500 f_vrfy, p_vrfy, NULL ) );
Manuel Pégourié-Gonnard95051642015-06-15 10:39:46 +02002501}
2502
Manuel Pégourié-Gonnard95051642015-06-15 10:39:46 +02002503/*
Manuel Pégourié-Gonnardbc3f44a2017-07-11 11:02:20 +02002504 * Verify the certificate validity (user-chosen profile, not restartable)
Manuel Pégourié-Gonnard95051642015-06-15 10:39:46 +02002505 */
2506int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
2507 mbedtls_x509_crt *trust_ca,
2508 mbedtls_x509_crl *ca_crl,
2509 const mbedtls_x509_crt_profile *profile,
2510 const char *cn, uint32_t *flags,
2511 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
2512 void *p_vrfy )
2513{
Manuel Pégourié-Gonnardbc3f44a2017-07-11 11:02:20 +02002514 return( mbedtls_x509_crt_verify_restartable( crt, trust_ca, ca_crl,
2515 profile, cn, flags, f_vrfy, p_vrfy, NULL ) );
2516}
2517
2518/*
2519 * Verify the certificate validity, with profile, restartable version
2520 *
2521 * This function:
2522 * - checks the requested CN (if any)
2523 * - checks the type and size of the EE cert's key,
2524 * as that isn't done as part of chain building/verification currently
2525 * - builds and verifies the chain
2526 * - then calls the callback and merges the flags
2527 */
2528int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt,
2529 mbedtls_x509_crt *trust_ca,
2530 mbedtls_x509_crl *ca_crl,
2531 const mbedtls_x509_crt_profile *profile,
2532 const char *cn, uint32_t *flags,
2533 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
2534 void *p_vrfy,
2535 mbedtls_x509_crt_restart_ctx *rs_ctx )
2536{
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002537 int ret;
Manuel Pégourié-Gonnard65eefc82015-10-23 14:08:48 +02002538 mbedtls_pk_type_t pk_type;
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002539 mbedtls_x509_crt_verify_chain ver_chain;
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002540 uint32_t ee_flags;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002541
2542 *flags = 0;
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002543 ee_flags = 0;
2544 x509_crt_verify_chain_reset( &ver_chain );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002545
Manuel Pégourié-Gonnardd15795a2017-06-22 12:19:27 +02002546 if( profile == NULL )
2547 {
2548 ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA;
2549 goto exit;
2550 }
2551
Manuel Pégourié-Gonnard1300e992017-07-04 01:13:44 +02002552 /* check name if requested */
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002553 if( cn != NULL )
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002554 x509_crt_verify_name( crt, cn, &ee_flags );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002555
Manuel Pégourié-Gonnard65eefc82015-10-23 14:08:48 +02002556 /* Check the type and size of the key */
2557 pk_type = mbedtls_pk_get_type( &crt->pk );
2558
2559 if( x509_profile_check_pk_alg( profile, pk_type ) != 0 )
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002560 ee_flags |= MBEDTLS_X509_BADCERT_BAD_PK;
Manuel Pégourié-Gonnard65eefc82015-10-23 14:08:48 +02002561
Manuel Pégourié-Gonnard3f816912017-10-26 10:24:16 +02002562 if( x509_profile_check_key( profile, &crt->pk ) != 0 )
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002563 ee_flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
Manuel Pégourié-Gonnard65eefc82015-10-23 14:08:48 +02002564
Manuel Pégourié-Gonnardbdc54402017-07-04 00:33:39 +02002565 /* Check the chain */
Manuel Pégourié-Gonnard505c3952017-07-05 17:36:47 +02002566 ret = x509_crt_verify_chain( crt, trust_ca, ca_crl, profile,
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002567 &ver_chain, rs_ctx );
Manuel Pégourié-Gonnarda4a5d1d2017-07-17 10:26:19 +02002568
Manuel Pégourié-Gonnardc547d1a2017-07-05 13:28:45 +02002569 if( ret != 0 )
2570 goto exit;
2571
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002572 /* Merge end-entity flags */
2573 ver_chain.items[0].flags |= ee_flags;
2574
Manuel Pégourié-Gonnarda707e1d2017-07-05 17:18:42 +02002575 /* Build final flags, calling callback on the way if any */
Manuel Pégourié-Gonnardc11e4ba2017-08-14 17:17:14 +02002576 ret = x509_crt_merge_flags_with_cb( flags, &ver_chain, f_vrfy, p_vrfy );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002577
Manuel Pégourié-Gonnardd15795a2017-06-22 12:19:27 +02002578exit:
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002579#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2580 if( rs_ctx != NULL && ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
2581 mbedtls_x509_crt_restart_free( rs_ctx );
2582#endif
2583
Manuel Pégourié-Gonnard9107b5f2017-07-06 12:16:25 +02002584 /* prevent misuse of the vrfy callback - VERIFY_FAILED would be ignored by
2585 * the SSL module for authmode optional, but non-zero return from the
2586 * callback means a fatal error so it shouldn't be ignored */
Manuel Pégourié-Gonnard31458a12017-06-26 10:11:49 +02002587 if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
2588 ret = MBEDTLS_ERR_X509_FATAL_ERROR;
2589
Manuel Pégourié-Gonnardd15795a2017-06-22 12:19:27 +02002590 if( ret != 0 )
2591 {
2592 *flags = (uint32_t) -1;
2593 return( ret );
2594 }
2595
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002596 if( *flags != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002597 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002598
2599 return( 0 );
2600}
2601
2602/*
Paul Bakker369d2eb2013-09-18 11:58:25 +02002603 * Initialize a certificate chain
2604 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002605void mbedtls_x509_crt_init( mbedtls_x509_crt *crt )
Paul Bakker369d2eb2013-09-18 11:58:25 +02002606{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002607 memset( crt, 0, sizeof(mbedtls_x509_crt) );
Paul Bakker369d2eb2013-09-18 11:58:25 +02002608}
2609
2610/*
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002611 * Unallocate all certificate data
2612 */
Hanno Beckercd03bb22019-02-15 17:15:53 +00002613
2614static void x509_free_sequence( mbedtls_x509_sequence *seq )
2615{
2616 while( seq != NULL )
2617 {
2618 mbedtls_x509_sequence *next = seq->next;
2619 mbedtls_platform_zeroize( seq, sizeof( *seq ) );
2620 mbedtls_free( seq );
2621 seq = next;
2622 }
2623}
2624
2625static void x509_free_name( mbedtls_x509_name *name )
2626{
2627 while( name != NULL )
2628 {
2629 mbedtls_x509_name *next = name->next;
2630 mbedtls_platform_zeroize( name, sizeof( *name ) );
2631 mbedtls_free( name );
2632 name = next;
2633 }
2634}
2635
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002636void mbedtls_x509_crt_free( mbedtls_x509_crt *crt )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002637{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002638 mbedtls_x509_crt *cert_cur = crt;
2639 mbedtls_x509_crt *cert_prv;
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002640
2641 if( crt == NULL )
2642 return;
2643
2644 do
2645 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002646 mbedtls_pk_free( &cert_cur->pk );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002647
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002648#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
2649 mbedtls_free( cert_cur->sig_opts );
Manuel Pégourié-Gonnardf75f2f72014-06-05 15:14:28 +02002650#endif
2651
Hanno Beckercd03bb22019-02-15 17:15:53 +00002652 x509_free_name( cert_cur->issuer.next );
2653 x509_free_name( cert_cur->subject.next );
2654 x509_free_sequence( cert_cur->ext_key_usage.next );
2655 x509_free_sequence( cert_cur->subject_alt_names.next );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002656
Hanno Beckeraa8665a2019-01-31 08:57:44 +00002657 if( cert_cur->raw.p != NULL && cert_cur->own_buffer )
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002658 {
Andres Amaya Garcia1f6301b2018-04-17 09:51:09 -05002659 mbedtls_platform_zeroize( cert_cur->raw.p, cert_cur->raw.len );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002660 mbedtls_free( cert_cur->raw.p );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002661 }
2662
2663 cert_cur = cert_cur->next;
2664 }
2665 while( cert_cur != NULL );
2666
2667 cert_cur = crt;
2668 do
2669 {
2670 cert_prv = cert_cur;
2671 cert_cur = cert_cur->next;
2672
Andres Amaya Garcia1f6301b2018-04-17 09:51:09 -05002673 mbedtls_platform_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002674 if( cert_prv != crt )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002675 mbedtls_free( cert_prv );
Paul Bakker7c6b2c32013-09-16 13:49:26 +02002676 }
2677 while( cert_cur != NULL );
2678}
2679
Manuel Pégourié-Gonnardbc3f44a2017-07-11 11:02:20 +02002680#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2681/*
2682 * Initialize a restart context
2683 */
2684void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx )
2685{
Manuel Pégourié-Gonnard15d7df22017-08-17 14:33:31 +02002686 mbedtls_pk_restart_init( &ctx->pk );
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002687
2688 ctx->parent = NULL;
2689 ctx->fallback_parent = NULL;
Manuel Pégourié-Gonnard78d7e8c2018-07-02 12:33:14 +02002690 ctx->fallback_signature_is_good = 0;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002691
2692 ctx->parent_is_trusted = -1;
2693
Manuel Pégourié-Gonnarddaf04912017-08-23 12:32:19 +02002694 ctx->in_progress = x509_crt_rs_none;
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002695 ctx->self_cnt = 0;
Manuel Pégourié-Gonnard83e923b2017-08-23 10:55:41 +02002696 x509_crt_verify_chain_reset( &ctx->ver_chain );
Manuel Pégourié-Gonnardbc3f44a2017-07-11 11:02:20 +02002697}
2698
2699/*
2700 * Free the components of a restart context
2701 */
2702void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx )
2703{
2704 if( ctx == NULL )
2705 return;
2706
Manuel Pégourié-Gonnard15d7df22017-08-17 14:33:31 +02002707 mbedtls_pk_restart_free( &ctx->pk );
Manuel Pégourié-Gonnard8b590492017-08-14 18:04:19 +02002708 mbedtls_x509_crt_restart_init( ctx );
Manuel Pégourié-Gonnardbc3f44a2017-07-11 11:02:20 +02002709}
2710#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
2711
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002712#endif /* MBEDTLS_X509_CRT_PARSE_C */