| 1 | /* |
| 2 | * X.509 Certidicate Revocation List (CRL) parsing |
| 3 | * |
| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved |
| 5 | * SPDX-License-Identifier: GPL-2.0 |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * This file is part of mbed TLS (https://tls.mbed.org) |
| 22 | */ |
| 23 | /* |
| 24 | * The ITU-T X.509 standard defines a certificate format for PKI. |
| 25 | * |
| 26 | * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs) |
| 27 | * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs) |
| 28 | * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10) |
| 29 | * |
| 30 | * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf |
| 31 | * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf |
| 32 | */ |
| 33 | |
| 34 | #if !defined(MBEDTLS_CONFIG_FILE) |
| 35 | #include "mbedtls/config.h" |
| 36 | #else |
| 37 | #include MBEDTLS_CONFIG_FILE |
| 38 | #endif |
| 39 | |
| 40 | #if defined(MBEDTLS_X509_CRL_PARSE_C) |
| 41 | |
| 42 | #include "mbedtls/x509_crl.h" |
| 43 | #include "mbedtls/oid.h" |
| 44 | #include "mbedtls/platform_util.h" |
| 45 | |
| 46 | #include <string.h> |
| 47 | |
| 48 | #if defined(MBEDTLS_PEM_PARSE_C) |
| 49 | #include "mbedtls/pem.h" |
| 50 | #endif |
| 51 | |
| 52 | #if defined(MBEDTLS_PLATFORM_C) |
| 53 | #include "mbedtls/platform.h" |
| 54 | #else |
| 55 | #include <stdlib.h> |
| 56 | #include <stdio.h> |
| 57 | #define mbedtls_free free |
| 58 | #define mbedtls_calloc calloc |
| 59 | #define mbedtls_snprintf snprintf |
| 60 | #endif |
| 61 | |
| 62 | #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) |
| 63 | #include <windows.h> |
| 64 | #else |
| 65 | #include <time.h> |
| 66 | #endif |
| 67 | |
| 68 | #if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32) |
| 69 | #include <stdio.h> |
| 70 | #endif |
| 71 | |
| 72 | /* |
| 73 | * Version ::= INTEGER { v1(0), v2(1) } |
| 74 | */ |
| 75 | static int x509_crl_get_version( unsigned char **p, |
| 76 | const unsigned char *end, |
| 77 | int *ver ) |
| 78 | { |
| 79 | int ret; |
| 80 | |
| 81 | if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 ) |
| 82 | { |
| 83 | if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| 84 | { |
| 85 | *ver = 0; |
| 86 | return( 0 ); |
| 87 | } |
| 88 | |
| 89 | return( MBEDTLS_ERR_X509_INVALID_VERSION + ret ); |
| 90 | } |
| 91 | |
| 92 | return( 0 ); |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * X.509 CRL v2 extensions |
| 97 | * |
| 98 | * We currently don't parse any extension's content, but we do check that the |
| 99 | * list of extensions is well-formed and abort on critical extensions (that |
| 100 | * are unsupported as we don't support any extension so far) |
| 101 | */ |
| 102 | static int x509_get_crl_ext( unsigned char **p, |
| 103 | const unsigned char *end, |
| 104 | mbedtls_x509_buf *ext ) |
| 105 | { |
| 106 | int ret; |
| 107 | |
| 108 | /* |
| 109 | * crlExtensions [0] EXPLICIT Extensions OPTIONAL |
| 110 | * -- if present, version MUST be v2 |
| 111 | */ |
| 112 | if( ( ret = mbedtls_x509_get_ext( p, end, ext, 0 ) ) != 0 ) |
| 113 | { |
| 114 | if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| 115 | return( 0 ); |
| 116 | |
| 117 | return( ret ); |
| 118 | } |
| 119 | |
| 120 | while( *p < end ) |
| 121 | { |
| 122 | /* |
| 123 | * Extension ::= SEQUENCE { |
| 124 | * extnID OBJECT IDENTIFIER, |
| 125 | * critical BOOLEAN DEFAULT FALSE, |
| 126 | * extnValue OCTET STRING } |
| 127 | */ |
| 128 | int is_critical = 0; |
| 129 | const unsigned char *end_ext_data; |
| 130 | size_t len; |
| 131 | |
| 132 | /* Get enclosing sequence tag */ |
| 133 | if( ( ret = mbedtls_asn1_get_tag( p, end, &len, |
| 134 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| 135 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| 136 | |
| 137 | end_ext_data = *p + len; |
| 138 | |
| 139 | /* Get OID (currently ignored) */ |
| 140 | if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len, |
| 141 | MBEDTLS_ASN1_OID ) ) != 0 ) |
| 142 | { |
| 143 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| 144 | } |
| 145 | *p += len; |
| 146 | |
| 147 | /* Get optional critical */ |
| 148 | if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, |
| 149 | &is_critical ) ) != 0 && |
| 150 | ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ) |
| 151 | { |
| 152 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| 153 | } |
| 154 | |
| 155 | /* Data should be octet string type */ |
| 156 | if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len, |
| 157 | MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) |
| 158 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| 159 | |
| 160 | /* Ignore data so far and just check its length */ |
| 161 | *p += len; |
| 162 | if( *p != end_ext_data ) |
| 163 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| 164 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| 165 | |
| 166 | /* Abort on (unsupported) critical extensions */ |
| 167 | if( is_critical ) |
| 168 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| 169 | MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); |
| 170 | } |
| 171 | |
| 172 | if( *p != end ) |
| 173 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| 174 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| 175 | |
| 176 | return( 0 ); |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * X.509 CRL v2 entry extensions (no extensions parsed yet.) |
| 181 | */ |
| 182 | static int x509_get_crl_entry_ext( unsigned char **p, |
| 183 | const unsigned char *end, |
| 184 | mbedtls_x509_buf *ext ) |
| 185 | { |
| 186 | int ret; |
| 187 | size_t len = 0; |
| 188 | |
| 189 | /* OPTIONAL */ |
| 190 | if( end <= *p ) |
| 191 | return( 0 ); |
| 192 | |
| 193 | ext->tag = **p; |
| 194 | ext->p = *p; |
| 195 | |
| 196 | /* |
| 197 | * Get CRL-entry extension sequence header |
| 198 | * crlEntryExtensions Extensions OPTIONAL -- if present, MUST be v2 |
| 199 | */ |
| 200 | if( ( ret = mbedtls_asn1_get_tag( p, end, &ext->len, |
| 201 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| 202 | { |
| 203 | if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| 204 | { |
| 205 | ext->p = NULL; |
| 206 | return( 0 ); |
| 207 | } |
| 208 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| 209 | } |
| 210 | |
| 211 | end = *p + ext->len; |
| 212 | |
| 213 | if( end != *p + ext->len ) |
| 214 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| 215 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| 216 | |
| 217 | while( *p < end ) |
| 218 | { |
| 219 | if( ( ret = mbedtls_asn1_get_tag( p, end, &len, |
| 220 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| 221 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); |
| 222 | |
| 223 | *p += len; |
| 224 | } |
| 225 | |
| 226 | if( *p != end ) |
| 227 | return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + |
| 228 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| 229 | |
| 230 | return( 0 ); |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * X.509 CRL Entries |
| 235 | */ |
| 236 | static int x509_get_entries( unsigned char **p, |
| 237 | const unsigned char *end, |
| 238 | mbedtls_x509_crl_entry *entry ) |
| 239 | { |
| 240 | int ret; |
| 241 | size_t entry_len; |
| 242 | mbedtls_x509_crl_entry *cur_entry = entry; |
| 243 | |
| 244 | if( *p == end ) |
| 245 | return( 0 ); |
| 246 | |
| 247 | if( ( ret = mbedtls_asn1_get_tag( p, end, &entry_len, |
| 248 | MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED ) ) != 0 ) |
| 249 | { |
| 250 | if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) |
| 251 | return( 0 ); |
| 252 | |
| 253 | return( ret ); |
| 254 | } |
| 255 | |
| 256 | end = *p + entry_len; |
| 257 | |
| 258 | while( *p < end ) |
| 259 | { |
| 260 | size_t len2; |
| 261 | const unsigned char *end2; |
| 262 | |
| 263 | if( ( ret = mbedtls_asn1_get_tag( p, end, &len2, |
| 264 | MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED ) ) != 0 ) |
| 265 | { |
| 266 | return( ret ); |
| 267 | } |
| 268 | |
| 269 | cur_entry->raw.tag = **p; |
| 270 | cur_entry->raw.p = *p; |
| 271 | cur_entry->raw.len = len2; |
| 272 | end2 = *p + len2; |
| 273 | |
| 274 | if( ( ret = mbedtls_x509_get_serial( p, end2, &cur_entry->serial ) ) != 0 ) |
| 275 | return( ret ); |
| 276 | |
| 277 | if( ( ret = mbedtls_x509_get_time( p, end2, |
| 278 | &cur_entry->revocation_date ) ) != 0 ) |
| 279 | return( ret ); |
| 280 | |
| 281 | if( ( ret = x509_get_crl_entry_ext( p, end2, |
| 282 | &cur_entry->entry_ext ) ) != 0 ) |
| 283 | return( ret ); |
| 284 | |
| 285 | if( *p < end ) |
| 286 | { |
| 287 | cur_entry->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crl_entry ) ); |
| 288 | |
| 289 | if( cur_entry->next == NULL ) |
| 290 | return( MBEDTLS_ERR_X509_ALLOC_FAILED ); |
| 291 | |
| 292 | cur_entry = cur_entry->next; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | return( 0 ); |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Parse one CRLs in DER format and append it to the chained list |
| 301 | */ |
| 302 | int mbedtls_x509_crl_parse_der( mbedtls_x509_crl *chain, |
| 303 | const unsigned char *buf, size_t buflen ) |
| 304 | { |
| 305 | int ret; |
| 306 | size_t len; |
| 307 | unsigned char *p = NULL, *end = NULL; |
| 308 | mbedtls_x509_buf sig_params1, sig_params2, sig_oid2; |
| 309 | mbedtls_x509_crl *crl = chain; |
| 310 | |
| 311 | /* |
| 312 | * Check for valid input |
| 313 | */ |
| 314 | if( crl == NULL || buf == NULL ) |
| 315 | return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| 316 | |
| 317 | memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) ); |
| 318 | memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) ); |
| 319 | memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) ); |
| 320 | |
| 321 | /* |
| 322 | * Add new CRL on the end of the chain if needed. |
| 323 | */ |
| 324 | while( crl->version != 0 && crl->next != NULL ) |
| 325 | crl = crl->next; |
| 326 | |
| 327 | if( crl->version != 0 && crl->next == NULL ) |
| 328 | { |
| 329 | crl->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crl ) ); |
| 330 | |
| 331 | if( crl->next == NULL ) |
| 332 | { |
| 333 | mbedtls_x509_crl_free( crl ); |
| 334 | return( MBEDTLS_ERR_X509_ALLOC_FAILED ); |
| 335 | } |
| 336 | |
| 337 | mbedtls_x509_crl_init( crl->next ); |
| 338 | crl = crl->next; |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * Copy raw DER-encoded CRL |
| 343 | */ |
| 344 | if( buflen == 0 ) |
| 345 | return( MBEDTLS_ERR_X509_INVALID_FORMAT ); |
| 346 | |
| 347 | p = mbedtls_calloc( 1, buflen ); |
| 348 | if( p == NULL ) |
| 349 | return( MBEDTLS_ERR_X509_ALLOC_FAILED ); |
| 350 | |
| 351 | memcpy( p, buf, buflen ); |
| 352 | |
| 353 | crl->raw.p = p; |
| 354 | crl->raw.len = buflen; |
| 355 | |
| 356 | end = p + buflen; |
| 357 | |
| 358 | /* |
| 359 | * CertificateList ::= SEQUENCE { |
| 360 | * tbsCertList TBSCertList, |
| 361 | * signatureAlgorithm AlgorithmIdentifier, |
| 362 | * signatureValue BIT STRING } |
| 363 | */ |
| 364 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| 365 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| 366 | { |
| 367 | mbedtls_x509_crl_free( crl ); |
| 368 | return( MBEDTLS_ERR_X509_INVALID_FORMAT ); |
| 369 | } |
| 370 | |
| 371 | if( len != (size_t) ( end - p ) ) |
| 372 | { |
| 373 | mbedtls_x509_crl_free( crl ); |
| 374 | return( MBEDTLS_ERR_X509_INVALID_FORMAT + |
| 375 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * TBSCertList ::= SEQUENCE { |
| 380 | */ |
| 381 | crl->tbs.p = p; |
| 382 | |
| 383 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| 384 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| 385 | { |
| 386 | mbedtls_x509_crl_free( crl ); |
| 387 | return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); |
| 388 | } |
| 389 | |
| 390 | end = p + len; |
| 391 | crl->tbs.len = end - crl->tbs.p; |
| 392 | |
| 393 | /* |
| 394 | * Version ::= INTEGER OPTIONAL { v1(0), v2(1) } |
| 395 | * -- if present, MUST be v2 |
| 396 | * |
| 397 | * signature AlgorithmIdentifier |
| 398 | */ |
| 399 | if( ( ret = x509_crl_get_version( &p, end, &crl->version ) ) != 0 || |
| 400 | ( ret = mbedtls_x509_get_alg( &p, end, &crl->sig_oid, &sig_params1 ) ) != 0 ) |
| 401 | { |
| 402 | mbedtls_x509_crl_free( crl ); |
| 403 | return( ret ); |
| 404 | } |
| 405 | |
| 406 | if( crl->version < 0 || crl->version > 1 ) |
| 407 | { |
| 408 | mbedtls_x509_crl_free( crl ); |
| 409 | return( MBEDTLS_ERR_X509_UNKNOWN_VERSION ); |
| 410 | } |
| 411 | |
| 412 | crl->version++; |
| 413 | |
| 414 | if( ( ret = mbedtls_x509_get_sig_alg( &crl->sig_oid, &sig_params1, |
| 415 | &crl->sig_md, &crl->sig_pk, |
| 416 | &crl->sig_opts ) ) != 0 ) |
| 417 | { |
| 418 | mbedtls_x509_crl_free( crl ); |
| 419 | return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG ); |
| 420 | } |
| 421 | |
| 422 | /* |
| 423 | * issuer Name |
| 424 | */ |
| 425 | crl->issuer_raw.p = p; |
| 426 | |
| 427 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, |
| 428 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
| 429 | { |
| 430 | mbedtls_x509_crl_free( crl ); |
| 431 | return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); |
| 432 | } |
| 433 | |
| 434 | if( ( ret = mbedtls_x509_get_name( &p, p + len, &crl->issuer ) ) != 0 ) |
| 435 | { |
| 436 | mbedtls_x509_crl_free( crl ); |
| 437 | return( ret ); |
| 438 | } |
| 439 | |
| 440 | crl->issuer_raw.len = p - crl->issuer_raw.p; |
| 441 | |
| 442 | /* |
| 443 | * thisUpdate Time |
| 444 | * nextUpdate Time OPTIONAL |
| 445 | */ |
| 446 | if( ( ret = mbedtls_x509_get_time( &p, end, &crl->this_update ) ) != 0 ) |
| 447 | { |
| 448 | mbedtls_x509_crl_free( crl ); |
| 449 | return( ret ); |
| 450 | } |
| 451 | |
| 452 | if( ( ret = mbedtls_x509_get_time( &p, end, &crl->next_update ) ) != 0 ) |
| 453 | { |
| 454 | if( ret != ( MBEDTLS_ERR_X509_INVALID_DATE + |
| 455 | MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) && |
| 456 | ret != ( MBEDTLS_ERR_X509_INVALID_DATE + |
| 457 | MBEDTLS_ERR_ASN1_OUT_OF_DATA ) ) |
| 458 | { |
| 459 | mbedtls_x509_crl_free( crl ); |
| 460 | return( ret ); |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | /* |
| 465 | * revokedCertificates SEQUENCE OF SEQUENCE { |
| 466 | * userCertificate CertificateSerialNumber, |
| 467 | * revocationDate Time, |
| 468 | * crlEntryExtensions Extensions OPTIONAL |
| 469 | * -- if present, MUST be v2 |
| 470 | * } OPTIONAL |
| 471 | */ |
| 472 | if( ( ret = x509_get_entries( &p, end, &crl->entry ) ) != 0 ) |
| 473 | { |
| 474 | mbedtls_x509_crl_free( crl ); |
| 475 | return( ret ); |
| 476 | } |
| 477 | |
| 478 | /* |
| 479 | * crlExtensions EXPLICIT Extensions OPTIONAL |
| 480 | * -- if present, MUST be v2 |
| 481 | */ |
| 482 | if( crl->version == 2 ) |
| 483 | { |
| 484 | ret = x509_get_crl_ext( &p, end, &crl->crl_ext ); |
| 485 | |
| 486 | if( ret != 0 ) |
| 487 | { |
| 488 | mbedtls_x509_crl_free( crl ); |
| 489 | return( ret ); |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | if( p != end ) |
| 494 | { |
| 495 | mbedtls_x509_crl_free( crl ); |
| 496 | return( MBEDTLS_ERR_X509_INVALID_FORMAT + |
| 497 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| 498 | } |
| 499 | |
| 500 | end = crl->raw.p + crl->raw.len; |
| 501 | |
| 502 | /* |
| 503 | * signatureAlgorithm AlgorithmIdentifier, |
| 504 | * signatureValue BIT STRING |
| 505 | */ |
| 506 | if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 ) |
| 507 | { |
| 508 | mbedtls_x509_crl_free( crl ); |
| 509 | return( ret ); |
| 510 | } |
| 511 | |
| 512 | if( crl->sig_oid.len != sig_oid2.len || |
| 513 | memcmp( crl->sig_oid.p, sig_oid2.p, crl->sig_oid.len ) != 0 || |
| 514 | sig_params1.len != sig_params2.len || |
| 515 | ( sig_params1.len != 0 && |
| 516 | memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) ) |
| 517 | { |
| 518 | mbedtls_x509_crl_free( crl ); |
| 519 | return( MBEDTLS_ERR_X509_SIG_MISMATCH ); |
| 520 | } |
| 521 | |
| 522 | if( ( ret = mbedtls_x509_get_sig( &p, end, &crl->sig ) ) != 0 ) |
| 523 | { |
| 524 | mbedtls_x509_crl_free( crl ); |
| 525 | return( ret ); |
| 526 | } |
| 527 | |
| 528 | if( p != end ) |
| 529 | { |
| 530 | mbedtls_x509_crl_free( crl ); |
| 531 | return( MBEDTLS_ERR_X509_INVALID_FORMAT + |
| 532 | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); |
| 533 | } |
| 534 | |
| 535 | return( 0 ); |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * Parse one or more CRLs and add them to the chained list |
| 540 | */ |
| 541 | int mbedtls_x509_crl_parse( mbedtls_x509_crl *chain, const unsigned char *buf, size_t buflen ) |
| 542 | { |
| 543 | #if defined(MBEDTLS_PEM_PARSE_C) |
| 544 | int ret; |
| 545 | size_t use_len; |
| 546 | mbedtls_pem_context pem; |
| 547 | int is_pem = 0; |
| 548 | |
| 549 | if( chain == NULL || buf == NULL ) |
| 550 | return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); |
| 551 | |
| 552 | do |
| 553 | { |
| 554 | mbedtls_pem_init( &pem ); |
| 555 | |
| 556 | // Avoid calling mbedtls_pem_read_buffer() on non-null-terminated |
| 557 | // string |
| 558 | if( buflen == 0 || buf[buflen - 1] != '\0' ) |
| 559 | ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; |
| 560 | else |
| 561 | ret = mbedtls_pem_read_buffer( &pem, |
| 562 | "-----BEGIN X509 CRL-----", |
| 563 | "-----END X509 CRL-----", |
| 564 | buf, NULL, 0, &use_len ); |
| 565 | |
| 566 | if( ret == 0 ) |
| 567 | { |
| 568 | /* |
| 569 | * Was PEM encoded |
| 570 | */ |
| 571 | is_pem = 1; |
| 572 | |
| 573 | buflen -= use_len; |
| 574 | buf += use_len; |
| 575 | |
| 576 | if( ( ret = mbedtls_x509_crl_parse_der( chain, |
| 577 | pem.buf, pem.buflen ) ) != 0 ) |
| 578 | { |
| 579 | mbedtls_pem_free( &pem ); |
| 580 | return( ret ); |
| 581 | } |
| 582 | } |
| 583 | else if( is_pem ) |
| 584 | { |
| 585 | mbedtls_pem_free( &pem ); |
| 586 | return( ret ); |
| 587 | } |
| 588 | |
| 589 | mbedtls_pem_free( &pem ); |
| 590 | } |
| 591 | /* In the PEM case, buflen is 1 at the end, for the terminated NULL byte. |
| 592 | * And a valid CRL cannot be less than 1 byte anyway. */ |
| 593 | while( is_pem && buflen > 1 ); |
| 594 | |
| 595 | if( is_pem ) |
| 596 | return( 0 ); |
| 597 | else |
| 598 | #endif /* MBEDTLS_PEM_PARSE_C */ |
| 599 | return( mbedtls_x509_crl_parse_der( chain, buf, buflen ) ); |
| 600 | } |
| 601 | |
| 602 | #if defined(MBEDTLS_FS_IO) |
| 603 | /* |
| 604 | * Load one or more CRLs and add them to the chained list |
| 605 | */ |
| 606 | int mbedtls_x509_crl_parse_file( mbedtls_x509_crl *chain, const char *path ) |
| 607 | { |
| 608 | int ret; |
| 609 | size_t n; |
| 610 | unsigned char *buf; |
| 611 | |
| 612 | if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 ) |
| 613 | return( ret ); |
| 614 | |
| 615 | ret = mbedtls_x509_crl_parse( chain, buf, n ); |
| 616 | |
| 617 | mbedtls_platform_zeroize( buf, n ); |
| 618 | mbedtls_free( buf ); |
| 619 | |
| 620 | return( ret ); |
| 621 | } |
| 622 | #endif /* MBEDTLS_FS_IO */ |
| 623 | |
| 624 | /* |
| 625 | * Return an informational string about the certificate. |
| 626 | */ |
| 627 | #define BEFORE_COLON 14 |
| 628 | #define BC "14" |
| 629 | /* |
| 630 | * Return an informational string about the CRL. |
| 631 | */ |
| 632 | int mbedtls_x509_crl_info( char *buf, size_t size, const char *prefix, |
| 633 | const mbedtls_x509_crl *crl ) |
| 634 | { |
| 635 | int ret; |
| 636 | size_t n; |
| 637 | char *p; |
| 638 | const mbedtls_x509_crl_entry *entry; |
| 639 | |
| 640 | p = buf; |
| 641 | n = size; |
| 642 | |
| 643 | ret = mbedtls_snprintf( p, n, "%sCRL version : %d", |
| 644 | prefix, crl->version ); |
| 645 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 646 | |
| 647 | ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix ); |
| 648 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 649 | ret = mbedtls_x509_dn_gets( p, n, &crl->issuer ); |
| 650 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 651 | |
| 652 | ret = mbedtls_snprintf( p, n, "\n%sthis update : " \ |
| 653 | "%04d-%02d-%02d %02d:%02d:%02d", prefix, |
| 654 | crl->this_update.year, crl->this_update.mon, |
| 655 | crl->this_update.day, crl->this_update.hour, |
| 656 | crl->this_update.min, crl->this_update.sec ); |
| 657 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 658 | |
| 659 | ret = mbedtls_snprintf( p, n, "\n%snext update : " \ |
| 660 | "%04d-%02d-%02d %02d:%02d:%02d", prefix, |
| 661 | crl->next_update.year, crl->next_update.mon, |
| 662 | crl->next_update.day, crl->next_update.hour, |
| 663 | crl->next_update.min, crl->next_update.sec ); |
| 664 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 665 | |
| 666 | entry = &crl->entry; |
| 667 | |
| 668 | ret = mbedtls_snprintf( p, n, "\n%sRevoked certificates:", |
| 669 | prefix ); |
| 670 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 671 | |
| 672 | while( entry != NULL && entry->raw.len != 0 ) |
| 673 | { |
| 674 | ret = mbedtls_snprintf( p, n, "\n%sserial number: ", |
| 675 | prefix ); |
| 676 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 677 | |
| 678 | ret = mbedtls_x509_serial_gets( p, n, &entry->serial ); |
| 679 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 680 | |
| 681 | ret = mbedtls_snprintf( p, n, " revocation date: " \ |
| 682 | "%04d-%02d-%02d %02d:%02d:%02d", |
| 683 | entry->revocation_date.year, entry->revocation_date.mon, |
| 684 | entry->revocation_date.day, entry->revocation_date.hour, |
| 685 | entry->revocation_date.min, entry->revocation_date.sec ); |
| 686 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 687 | |
| 688 | entry = entry->next; |
| 689 | } |
| 690 | |
| 691 | ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix ); |
| 692 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 693 | |
| 694 | ret = mbedtls_x509_sig_alg_gets( p, n, &crl->sig_oid, crl->sig_pk, crl->sig_md, |
| 695 | crl->sig_opts ); |
| 696 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 697 | |
| 698 | ret = mbedtls_snprintf( p, n, "\n" ); |
| 699 | MBEDTLS_X509_SAFE_SNPRINTF; |
| 700 | |
| 701 | return( (int) ( size - n ) ); |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * Initialize a CRL chain |
| 706 | */ |
| 707 | void mbedtls_x509_crl_init( mbedtls_x509_crl *crl ) |
| 708 | { |
| 709 | memset( crl, 0, sizeof(mbedtls_x509_crl) ); |
| 710 | } |
| 711 | |
| 712 | /* |
| 713 | * Unallocate all CRL data |
| 714 | */ |
| 715 | void mbedtls_x509_crl_free( mbedtls_x509_crl *crl ) |
| 716 | { |
| 717 | mbedtls_x509_crl *crl_cur = crl; |
| 718 | mbedtls_x509_crl *crl_prv; |
| 719 | mbedtls_x509_name *name_cur; |
| 720 | mbedtls_x509_name *name_prv; |
| 721 | mbedtls_x509_crl_entry *entry_cur; |
| 722 | mbedtls_x509_crl_entry *entry_prv; |
| 723 | |
| 724 | if( crl == NULL ) |
| 725 | return; |
| 726 | |
| 727 | do |
| 728 | { |
| 729 | #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) |
| 730 | mbedtls_free( crl_cur->sig_opts ); |
| 731 | #endif |
| 732 | |
| 733 | name_cur = crl_cur->issuer.next; |
| 734 | while( name_cur != NULL ) |
| 735 | { |
| 736 | name_prv = name_cur; |
| 737 | name_cur = name_cur->next; |
| 738 | mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); |
| 739 | mbedtls_free( name_prv ); |
| 740 | } |
| 741 | |
| 742 | entry_cur = crl_cur->entry.next; |
| 743 | while( entry_cur != NULL ) |
| 744 | { |
| 745 | entry_prv = entry_cur; |
| 746 | entry_cur = entry_cur->next; |
| 747 | mbedtls_platform_zeroize( entry_prv, |
| 748 | sizeof( mbedtls_x509_crl_entry ) ); |
| 749 | mbedtls_free( entry_prv ); |
| 750 | } |
| 751 | |
| 752 | if( crl_cur->raw.p != NULL ) |
| 753 | { |
| 754 | mbedtls_platform_zeroize( crl_cur->raw.p, crl_cur->raw.len ); |
| 755 | mbedtls_free( crl_cur->raw.p ); |
| 756 | } |
| 757 | |
| 758 | crl_cur = crl_cur->next; |
| 759 | } |
| 760 | while( crl_cur != NULL ); |
| 761 | |
| 762 | crl_cur = crl; |
| 763 | do |
| 764 | { |
| 765 | crl_prv = crl_cur; |
| 766 | crl_cur = crl_cur->next; |
| 767 | |
| 768 | mbedtls_platform_zeroize( crl_prv, sizeof( mbedtls_x509_crl ) ); |
| 769 | if( crl_prv != crl ) |
| 770 | mbedtls_free( crl_prv ); |
| 771 | } |
| 772 | while( crl_cur != NULL ); |
| 773 | } |
| 774 | |
| 775 | #endif /* MBEDTLS_X509_CRL_PARSE_C */ |