The Android Open Source Project | 845e012 | 2009-03-03 19:31:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * X.509v3 certificate parsing and processing (RFC 3280 profile) |
| 3 | * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * Alternatively, this software may be distributed under the terms of BSD |
| 10 | * license. |
| 11 | * |
| 12 | * See README and COPYING for more details. |
| 13 | */ |
| 14 | |
| 15 | #include "includes.h" |
| 16 | |
| 17 | #include "common.h" |
| 18 | |
| 19 | #ifdef CONFIG_INTERNAL_X509 |
| 20 | |
| 21 | #include "asn1.h" |
| 22 | #include "crypto.h" |
| 23 | #include "x509v3.h" |
| 24 | |
| 25 | |
| 26 | static void x509_free_name(struct x509_name *name) |
| 27 | { |
| 28 | os_free(name->cn); |
| 29 | os_free(name->c); |
| 30 | os_free(name->l); |
| 31 | os_free(name->st); |
| 32 | os_free(name->o); |
| 33 | os_free(name->ou); |
| 34 | os_free(name->email); |
| 35 | name->cn = name->c = name->l = name->st = name->o = name->ou = NULL; |
| 36 | name->email = NULL; |
| 37 | } |
| 38 | |
| 39 | |
| 40 | /** |
| 41 | * x509_certificate_free - Free an X.509 certificate |
| 42 | * @cert: Certificate to be freed |
| 43 | */ |
| 44 | void x509_certificate_free(struct x509_certificate *cert) |
| 45 | { |
| 46 | if (cert == NULL) |
| 47 | return; |
| 48 | if (cert->next) { |
| 49 | wpa_printf(MSG_DEBUG, "X509: x509_certificate_free: cer=%p " |
| 50 | "was still on a list (next=%p)\n", |
| 51 | cert, cert->next); |
| 52 | } |
| 53 | x509_free_name(&cert->issuer); |
| 54 | x509_free_name(&cert->subject); |
| 55 | os_free(cert->public_key); |
| 56 | os_free(cert->sign_value); |
| 57 | os_free(cert); |
| 58 | } |
| 59 | |
| 60 | |
| 61 | /** |
| 62 | * x509_certificate_free - Free an X.509 certificate chain |
| 63 | * @cert: Pointer to the first certificate in the chain |
| 64 | */ |
| 65 | void x509_certificate_chain_free(struct x509_certificate *cert) |
| 66 | { |
| 67 | struct x509_certificate *next; |
| 68 | |
| 69 | while (cert) { |
| 70 | next = cert->next; |
| 71 | cert->next = NULL; |
| 72 | x509_certificate_free(cert); |
| 73 | cert = next; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | |
| 78 | static int x509_whitespace(char c) |
| 79 | { |
| 80 | return c == ' ' || c == '\t'; |
| 81 | } |
| 82 | |
| 83 | |
| 84 | static void x509_str_strip_whitespace(char *a) |
| 85 | { |
| 86 | char *ipos, *opos; |
| 87 | int remove_whitespace = 1; |
| 88 | |
| 89 | ipos = opos = a; |
| 90 | |
| 91 | while (*ipos) { |
| 92 | if (remove_whitespace && x509_whitespace(*ipos)) |
| 93 | ipos++; |
| 94 | else { |
| 95 | remove_whitespace = x509_whitespace(*ipos); |
| 96 | *opos++ = *ipos++; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | *opos-- = '\0'; |
| 101 | if (opos > a && x509_whitespace(*opos)) |
| 102 | *opos = '\0'; |
| 103 | } |
| 104 | |
| 105 | |
| 106 | static int x509_str_compare(const char *a, const char *b) |
| 107 | { |
| 108 | char *aa, *bb; |
| 109 | int ret; |
| 110 | |
| 111 | if (!a && b) |
| 112 | return -1; |
| 113 | if (a && !b) |
| 114 | return 1; |
| 115 | if (!a && !b) |
| 116 | return 0; |
| 117 | |
| 118 | aa = os_strdup(a); |
| 119 | bb = os_strdup(b); |
| 120 | |
| 121 | if (aa == NULL || bb == NULL) { |
| 122 | os_free(aa); |
| 123 | os_free(bb); |
| 124 | return os_strcasecmp(a, b); |
| 125 | } |
| 126 | |
| 127 | x509_str_strip_whitespace(aa); |
| 128 | x509_str_strip_whitespace(bb); |
| 129 | |
| 130 | ret = os_strcasecmp(aa, bb); |
| 131 | |
| 132 | os_free(aa); |
| 133 | os_free(bb); |
| 134 | |
| 135 | return ret; |
| 136 | } |
| 137 | |
| 138 | |
| 139 | /** |
| 140 | * x509_name_compare - Compare X.509 certificate names |
| 141 | * @a: Certificate name |
| 142 | * @b: Certificate name |
| 143 | * Returns: <0, 0, or >0 based on whether a is less than, equal to, or |
| 144 | * greater than b |
| 145 | */ |
| 146 | int x509_name_compare(struct x509_name *a, struct x509_name *b) |
| 147 | { |
| 148 | int res; |
| 149 | |
| 150 | if (!a && b) |
| 151 | return -1; |
| 152 | if (a && !b) |
| 153 | return 1; |
| 154 | if (!a && !b) |
| 155 | return 0; |
| 156 | |
| 157 | res = x509_str_compare(a->cn, b->cn); |
| 158 | if (res) |
| 159 | return res; |
| 160 | res = x509_str_compare(a->c, b->c); |
| 161 | if (res) |
| 162 | return res; |
| 163 | res = x509_str_compare(a->l, b->l); |
| 164 | if (res) |
| 165 | return res; |
| 166 | res = x509_str_compare(a->st, b->st); |
| 167 | if (res) |
| 168 | return res; |
| 169 | res = x509_str_compare(a->o, b->o); |
| 170 | if (res) |
| 171 | return res; |
| 172 | res = x509_str_compare(a->ou, b->ou); |
| 173 | if (res) |
| 174 | return res; |
| 175 | res = x509_str_compare(a->email, b->email); |
| 176 | if (res) |
| 177 | return res; |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | |
| 183 | static int x509_parse_algorithm_identifier( |
| 184 | const u8 *buf, size_t len, |
| 185 | struct x509_algorithm_identifier *id, const u8 **next) |
| 186 | { |
| 187 | struct asn1_hdr hdr; |
| 188 | const u8 *pos, *end; |
| 189 | |
| 190 | /* |
| 191 | * AlgorithmIdentifier ::= SEQUENCE { |
| 192 | * algorithm OBJECT IDENTIFIER, |
| 193 | * parameters ANY DEFINED BY algorithm OPTIONAL |
| 194 | * } |
| 195 | */ |
| 196 | |
| 197 | if (asn1_get_next(buf, len, &hdr) < 0 || |
| 198 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 199 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 200 | wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE " |
| 201 | "(AlgorithmIdentifier) - found class %d tag 0x%x", |
| 202 | hdr.class, hdr.tag); |
| 203 | return -1; |
| 204 | } |
| 205 | pos = hdr.payload; |
| 206 | end = pos + hdr.length; |
| 207 | |
| 208 | if (end > buf + len) |
| 209 | return -1; |
| 210 | |
| 211 | *next = end; |
| 212 | |
| 213 | if (asn1_get_oid(pos, end - pos, &id->oid, &pos)) |
| 214 | return -1; |
| 215 | |
| 216 | /* TODO: optional parameters */ |
| 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | |
| 222 | static int x509_parse_public_key(const u8 *buf, size_t len, |
| 223 | struct x509_certificate *cert, |
| 224 | const u8 **next) |
| 225 | { |
| 226 | struct asn1_hdr hdr; |
| 227 | const u8 *pos, *end; |
| 228 | |
| 229 | /* |
| 230 | * SubjectPublicKeyInfo ::= SEQUENCE { |
| 231 | * algorithm AlgorithmIdentifier, |
| 232 | * subjectPublicKey BIT STRING |
| 233 | * } |
| 234 | */ |
| 235 | |
| 236 | pos = buf; |
| 237 | end = buf + len; |
| 238 | |
| 239 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 240 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 241 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 242 | wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE " |
| 243 | "(SubjectPublicKeyInfo) - found class %d tag 0x%x", |
| 244 | hdr.class, hdr.tag); |
| 245 | return -1; |
| 246 | } |
| 247 | pos = hdr.payload; |
| 248 | |
| 249 | if (pos + hdr.length > end) |
| 250 | return -1; |
| 251 | end = pos + hdr.length; |
| 252 | *next = end; |
| 253 | |
| 254 | if (x509_parse_algorithm_identifier(pos, end - pos, |
| 255 | &cert->public_key_alg, &pos)) |
| 256 | return -1; |
| 257 | |
| 258 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 259 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 260 | hdr.tag != ASN1_TAG_BITSTRING) { |
| 261 | wpa_printf(MSG_DEBUG, "X509: Expected BITSTRING " |
| 262 | "(subjectPublicKey) - found class %d tag 0x%x", |
| 263 | hdr.class, hdr.tag); |
| 264 | return -1; |
| 265 | } |
| 266 | if (hdr.length < 1) |
| 267 | return -1; |
| 268 | pos = hdr.payload; |
| 269 | if (*pos) { |
| 270 | wpa_printf(MSG_DEBUG, "X509: BITSTRING - %d unused bits", |
| 271 | *pos); |
| 272 | /* |
| 273 | * TODO: should this be rejected? X.509 certificates are |
| 274 | * unlikely to use such a construction. Now we would end up |
| 275 | * including the extra bits in the buffer which may also be |
| 276 | * ok. |
| 277 | */ |
| 278 | } |
| 279 | os_free(cert->public_key); |
| 280 | cert->public_key = os_malloc(hdr.length - 1); |
| 281 | if (cert->public_key == NULL) { |
| 282 | wpa_printf(MSG_DEBUG, "X509: Failed to allocate memory for " |
| 283 | "public key"); |
| 284 | return -1; |
| 285 | } |
| 286 | os_memcpy(cert->public_key, pos + 1, hdr.length - 1); |
| 287 | cert->public_key_len = hdr.length - 1; |
| 288 | wpa_hexdump(MSG_MSGDUMP, "X509: subjectPublicKey", |
| 289 | cert->public_key, cert->public_key_len); |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | |
| 295 | static int x509_parse_name(const u8 *buf, size_t len, struct x509_name *name, |
| 296 | const u8 **next) |
| 297 | { |
| 298 | struct asn1_hdr hdr; |
| 299 | const u8 *pos, *end, *set_pos, *set_end, *seq_pos, *seq_end; |
| 300 | struct asn1_oid oid; |
| 301 | char **fieldp; |
| 302 | |
| 303 | /* |
| 304 | * Name ::= CHOICE { RDNSequence } |
| 305 | * RDNSequence ::= SEQUENCE OF RelativeDistinguishedName |
| 306 | * RelativeDistinguishedName ::= SET OF AttributeTypeAndValue |
| 307 | * AttributeTypeAndValue ::= SEQUENCE { |
| 308 | * type AttributeType, |
| 309 | * value AttributeValue |
| 310 | * } |
| 311 | * AttributeType ::= OBJECT IDENTIFIER |
| 312 | * AttributeValue ::= ANY DEFINED BY AttributeType |
| 313 | */ |
| 314 | |
| 315 | if (asn1_get_next(buf, len, &hdr) < 0 || |
| 316 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 317 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 318 | wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE " |
| 319 | "(Name / RDNSequencer) - found class %d tag 0x%x", |
| 320 | hdr.class, hdr.tag); |
| 321 | return -1; |
| 322 | } |
| 323 | pos = hdr.payload; |
| 324 | |
| 325 | if (pos + hdr.length > buf + len) |
| 326 | return -1; |
| 327 | |
| 328 | end = *next = pos + hdr.length; |
| 329 | |
| 330 | while (pos < end) { |
| 331 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 332 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 333 | hdr.tag != ASN1_TAG_SET) { |
| 334 | wpa_printf(MSG_DEBUG, "X509: Expected SET " |
| 335 | "(RelativeDistinguishedName) - found class " |
| 336 | "%d tag 0x%x", hdr.class, hdr.tag); |
| 337 | x509_free_name(name); |
| 338 | return -1; |
| 339 | } |
| 340 | |
| 341 | set_pos = hdr.payload; |
| 342 | pos = set_end = hdr.payload + hdr.length; |
| 343 | |
| 344 | if (asn1_get_next(set_pos, set_end - set_pos, &hdr) < 0 || |
| 345 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 346 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 347 | wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE " |
| 348 | "(AttributeTypeAndValue) - found class %d " |
| 349 | "tag 0x%x", hdr.class, hdr.tag); |
| 350 | x509_free_name(name); |
| 351 | return -1; |
| 352 | } |
| 353 | |
| 354 | seq_pos = hdr.payload; |
| 355 | seq_end = hdr.payload + hdr.length; |
| 356 | |
| 357 | if (asn1_get_oid(seq_pos, seq_end - seq_pos, &oid, &seq_pos)) { |
| 358 | x509_free_name(name); |
| 359 | return -1; |
| 360 | } |
| 361 | |
| 362 | if (asn1_get_next(seq_pos, seq_end - seq_pos, &hdr) < 0 || |
| 363 | hdr.class != ASN1_CLASS_UNIVERSAL) { |
| 364 | wpa_printf(MSG_DEBUG, "X509: Failed to parse " |
| 365 | "AttributeValue"); |
| 366 | x509_free_name(name); |
| 367 | return -1; |
| 368 | } |
| 369 | |
| 370 | /* RFC 3280: |
| 371 | * MUST: country, organization, organizational-unit, |
| 372 | * distinguished name qualifier, state or province name, |
| 373 | * common name, serial number. |
| 374 | * SHOULD: locality, title, surname, given name, initials, |
| 375 | * pseudonym, generation qualifier. |
| 376 | * MUST: domainComponent (RFC 2247). |
| 377 | */ |
| 378 | fieldp = NULL; |
| 379 | if (oid.len == 4 && |
| 380 | oid.oid[0] == 2 && oid.oid[1] == 5 && oid.oid[2] == 4) { |
| 381 | /* id-at ::= 2.5.4 */ |
| 382 | switch (oid.oid[3]) { |
| 383 | case 3: |
| 384 | /* commonName */ |
| 385 | fieldp = &name->cn; |
| 386 | break; |
| 387 | case 6: |
| 388 | /* countryName */ |
| 389 | fieldp = &name->c; |
| 390 | break; |
| 391 | case 7: |
| 392 | /* localityName */ |
| 393 | fieldp = &name->l; |
| 394 | break; |
| 395 | case 8: |
| 396 | /* stateOrProvinceName */ |
| 397 | fieldp = &name->st; |
| 398 | break; |
| 399 | case 10: |
| 400 | /* organizationName */ |
| 401 | fieldp = &name->o; |
| 402 | break; |
| 403 | case 11: |
| 404 | /* organizationalUnitName */ |
| 405 | fieldp = &name->ou; |
| 406 | break; |
| 407 | } |
| 408 | } else if (oid.len == 7 && |
| 409 | oid.oid[0] == 1 && oid.oid[1] == 2 && |
| 410 | oid.oid[2] == 840 && oid.oid[3] == 113549 && |
| 411 | oid.oid[4] == 1 && oid.oid[5] == 9 && |
| 412 | oid.oid[6] == 1) { |
| 413 | /* 1.2.840.113549.1.9.1 - e-mailAddress */ |
| 414 | fieldp = &name->email; |
| 415 | } |
| 416 | |
| 417 | if (fieldp == NULL) { |
| 418 | wpa_hexdump(MSG_DEBUG, "X509: Unrecognized OID", |
| 419 | (u8 *) oid.oid, |
| 420 | oid.len * sizeof(oid.oid[0])); |
| 421 | wpa_hexdump_ascii(MSG_MSGDUMP, "X509: Attribute Data", |
| 422 | hdr.payload, hdr.length); |
| 423 | continue; |
| 424 | } |
| 425 | |
| 426 | os_free(*fieldp); |
| 427 | *fieldp = os_malloc(hdr.length + 1); |
| 428 | if (*fieldp == NULL) { |
| 429 | x509_free_name(name); |
| 430 | return -1; |
| 431 | } |
| 432 | os_memcpy(*fieldp, hdr.payload, hdr.length); |
| 433 | (*fieldp)[hdr.length] = '\0'; |
| 434 | } |
| 435 | |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | |
| 440 | /** |
| 441 | * x509_name_string - Convert an X.509 certificate name into a string |
| 442 | * @name: Name to convert |
| 443 | * @buf: Buffer for the string |
| 444 | * @len: Maximum buffer length |
| 445 | */ |
| 446 | void x509_name_string(struct x509_name *name, char *buf, size_t len) |
| 447 | { |
| 448 | char *pos, *end; |
| 449 | int ret; |
| 450 | |
| 451 | if (len == 0) |
| 452 | return; |
| 453 | |
| 454 | pos = buf; |
| 455 | end = buf + len; |
| 456 | |
| 457 | if (name->c) { |
| 458 | ret = os_snprintf(pos, end - pos, "C=%s, ", name->c); |
| 459 | if (ret < 0 || ret >= end - pos) |
| 460 | goto done; |
| 461 | pos += ret; |
| 462 | } |
| 463 | if (name->st) { |
| 464 | ret = os_snprintf(pos, end - pos, "ST=%s, ", name->st); |
| 465 | if (ret < 0 || ret >= end - pos) |
| 466 | goto done; |
| 467 | pos += ret; |
| 468 | } |
| 469 | if (name->l) { |
| 470 | ret = os_snprintf(pos, end - pos, "L=%s, ", name->l); |
| 471 | if (ret < 0 || ret >= end - pos) |
| 472 | goto done; |
| 473 | pos += ret; |
| 474 | } |
| 475 | if (name->o) { |
| 476 | ret = os_snprintf(pos, end - pos, "O=%s, ", name->o); |
| 477 | if (ret < 0 || ret >= end - pos) |
| 478 | goto done; |
| 479 | pos += ret; |
| 480 | } |
| 481 | if (name->ou) { |
| 482 | ret = os_snprintf(pos, end - pos, "OU=%s, ", name->ou); |
| 483 | if (ret < 0 || ret >= end - pos) |
| 484 | goto done; |
| 485 | pos += ret; |
| 486 | } |
| 487 | if (name->cn) { |
| 488 | ret = os_snprintf(pos, end - pos, "CN=%s, ", name->cn); |
| 489 | if (ret < 0 || ret >= end - pos) |
| 490 | goto done; |
| 491 | pos += ret; |
| 492 | } |
| 493 | |
| 494 | if (pos > buf + 1 && pos[-1] == ' ' && pos[-2] == ',') { |
| 495 | *pos-- = '\0'; |
| 496 | *pos-- = '\0'; |
| 497 | } |
| 498 | |
| 499 | if (name->email) { |
| 500 | ret = os_snprintf(pos, end - pos, "/emailAddress=%s", |
| 501 | name->email); |
| 502 | if (ret < 0 || ret >= end - pos) |
| 503 | goto done; |
| 504 | pos += ret; |
| 505 | } |
| 506 | |
| 507 | done: |
| 508 | end[-1] = '\0'; |
| 509 | } |
| 510 | |
| 511 | |
| 512 | static int x509_parse_time(const u8 *buf, size_t len, u8 asn1_tag, |
| 513 | os_time_t *val) |
| 514 | { |
| 515 | const char *pos; |
| 516 | int year, month, day, hour, min, sec; |
| 517 | |
| 518 | /* |
| 519 | * Time ::= CHOICE { |
| 520 | * utcTime UTCTime, |
| 521 | * generalTime GeneralizedTime |
| 522 | * } |
| 523 | * |
| 524 | * UTCTime: YYMMDDHHMMSSZ |
| 525 | * GeneralizedTime: YYYYMMDDHHMMSSZ |
| 526 | */ |
| 527 | |
| 528 | pos = (const char *) buf; |
| 529 | |
| 530 | switch (asn1_tag) { |
| 531 | case ASN1_TAG_UTCTIME: |
| 532 | if (len != 13 || buf[12] != 'Z') { |
| 533 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Unrecognized " |
| 534 | "UTCTime format", buf, len); |
| 535 | return -1; |
| 536 | } |
| 537 | if (sscanf(pos, "%02d", &year) != 1) { |
| 538 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse " |
| 539 | "UTCTime year", buf, len); |
| 540 | return -1; |
| 541 | } |
| 542 | if (year < 50) |
| 543 | year += 2000; |
| 544 | else |
| 545 | year += 1900; |
| 546 | pos += 2; |
| 547 | break; |
| 548 | case ASN1_TAG_GENERALIZEDTIME: |
| 549 | if (len != 15 || buf[14] != 'Z') { |
| 550 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Unrecognized " |
| 551 | "GeneralizedTime format", buf, len); |
| 552 | return -1; |
| 553 | } |
| 554 | if (sscanf(pos, "%04d", &year) != 1) { |
| 555 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse " |
| 556 | "GeneralizedTime year", buf, len); |
| 557 | return -1; |
| 558 | } |
| 559 | pos += 4; |
| 560 | break; |
| 561 | default: |
| 562 | wpa_printf(MSG_DEBUG, "X509: Expected UTCTime or " |
| 563 | "GeneralizedTime - found tag 0x%x", asn1_tag); |
| 564 | return -1; |
| 565 | } |
| 566 | |
| 567 | if (sscanf(pos, "%02d", &month) != 1) { |
| 568 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time " |
| 569 | "(month)", buf, len); |
| 570 | return -1; |
| 571 | } |
| 572 | pos += 2; |
| 573 | |
| 574 | if (sscanf(pos, "%02d", &day) != 1) { |
| 575 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time " |
| 576 | "(day)", buf, len); |
| 577 | return -1; |
| 578 | } |
| 579 | pos += 2; |
| 580 | |
| 581 | if (sscanf(pos, "%02d", &hour) != 1) { |
| 582 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time " |
| 583 | "(hour)", buf, len); |
| 584 | return -1; |
| 585 | } |
| 586 | pos += 2; |
| 587 | |
| 588 | if (sscanf(pos, "%02d", &min) != 1) { |
| 589 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time " |
| 590 | "(min)", buf, len); |
| 591 | return -1; |
| 592 | } |
| 593 | pos += 2; |
| 594 | |
| 595 | if (sscanf(pos, "%02d", &sec) != 1) { |
| 596 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time " |
| 597 | "(sec)", buf, len); |
| 598 | return -1; |
| 599 | } |
| 600 | |
| 601 | if (os_mktime(year, month, day, hour, min, sec, val) < 0) { |
| 602 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to convert Time", |
| 603 | buf, len); |
| 604 | if (year < 1970) { |
| 605 | /* |
| 606 | * At least some test certificates have been configured |
| 607 | * to use dates prior to 1970. Set the date to |
| 608 | * beginning of 1970 to handle these case. |
| 609 | */ |
| 610 | wpa_printf(MSG_DEBUG, "X509: Year=%d before epoch - " |
| 611 | "assume epoch as the time", year); |
| 612 | *val = 0; |
| 613 | return 0; |
| 614 | } |
| 615 | return -1; |
| 616 | } |
| 617 | |
| 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | |
| 622 | static int x509_parse_validity(const u8 *buf, size_t len, |
| 623 | struct x509_certificate *cert, const u8 **next) |
| 624 | { |
| 625 | struct asn1_hdr hdr; |
| 626 | const u8 *pos; |
| 627 | size_t plen; |
| 628 | |
| 629 | /* |
| 630 | * Validity ::= SEQUENCE { |
| 631 | * notBefore Time, |
| 632 | * notAfter Time |
| 633 | * } |
| 634 | * |
| 635 | * RFC 3280, 4.1.2.5: |
| 636 | * CAs conforming to this profile MUST always encode certificate |
| 637 | * validity dates through the year 2049 as UTCTime; certificate |
| 638 | * validity dates in 2050 or later MUST be encoded as GeneralizedTime. |
| 639 | */ |
| 640 | |
| 641 | if (asn1_get_next(buf, len, &hdr) < 0 || |
| 642 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 643 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 644 | wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE " |
| 645 | "(Validity) - found class %d tag 0x%x", |
| 646 | hdr.class, hdr.tag); |
| 647 | return -1; |
| 648 | } |
| 649 | pos = hdr.payload; |
| 650 | plen = hdr.length; |
| 651 | |
| 652 | if (pos + plen > buf + len) |
| 653 | return -1; |
| 654 | |
| 655 | *next = pos + plen; |
| 656 | |
| 657 | if (asn1_get_next(pos, plen, &hdr) < 0 || |
| 658 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 659 | x509_parse_time(hdr.payload, hdr.length, hdr.tag, |
| 660 | &cert->not_before) < 0) { |
| 661 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse notBefore " |
| 662 | "Time", hdr.payload, hdr.length); |
| 663 | return -1; |
| 664 | } |
| 665 | |
| 666 | pos = hdr.payload + hdr.length; |
| 667 | plen = *next - pos; |
| 668 | |
| 669 | if (asn1_get_next(pos, plen, &hdr) < 0 || |
| 670 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 671 | x509_parse_time(hdr.payload, hdr.length, hdr.tag, |
| 672 | &cert->not_after) < 0) { |
| 673 | wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse notAfter " |
| 674 | "Time", hdr.payload, hdr.length); |
| 675 | return -1; |
| 676 | } |
| 677 | |
| 678 | wpa_printf(MSG_MSGDUMP, "X509: Validity: notBefore: %lu notAfter: %lu", |
| 679 | (unsigned long) cert->not_before, |
| 680 | (unsigned long) cert->not_after); |
| 681 | |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | |
| 686 | static int x509_id_ce_oid(struct asn1_oid *oid) |
| 687 | { |
| 688 | /* id-ce arc from X.509 for standard X.509v3 extensions */ |
| 689 | return oid->len >= 4 && |
| 690 | oid->oid[0] == 2 /* joint-iso-ccitt */ && |
| 691 | oid->oid[1] == 5 /* ds */ && |
| 692 | oid->oid[2] == 29 /* id-ce */; |
| 693 | } |
| 694 | |
| 695 | |
| 696 | static int x509_parse_ext_key_usage(struct x509_certificate *cert, |
| 697 | const u8 *pos, size_t len) |
| 698 | { |
| 699 | struct asn1_hdr hdr; |
| 700 | |
| 701 | /* |
| 702 | * KeyUsage ::= BIT STRING { |
| 703 | * digitalSignature (0), |
| 704 | * nonRepudiation (1), |
| 705 | * keyEncipherment (2), |
| 706 | * dataEncipherment (3), |
| 707 | * keyAgreement (4), |
| 708 | * keyCertSign (5), |
| 709 | * cRLSign (6), |
| 710 | * encipherOnly (7), |
| 711 | * decipherOnly (8) } |
| 712 | */ |
| 713 | |
| 714 | if (asn1_get_next(pos, len, &hdr) < 0 || |
| 715 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 716 | hdr.tag != ASN1_TAG_BITSTRING || |
| 717 | hdr.length < 1) { |
| 718 | wpa_printf(MSG_DEBUG, "X509: Expected BIT STRING in " |
| 719 | "KeyUsage; found %d tag 0x%x len %d", |
| 720 | hdr.class, hdr.tag, hdr.length); |
| 721 | return -1; |
| 722 | } |
| 723 | |
| 724 | cert->extensions_present |= X509_EXT_KEY_USAGE; |
| 725 | cert->key_usage = asn1_bit_string_to_long(hdr.payload, hdr.length); |
| 726 | |
| 727 | wpa_printf(MSG_DEBUG, "X509: KeyUsage 0x%lx", cert->key_usage); |
| 728 | |
| 729 | return 0; |
| 730 | } |
| 731 | |
| 732 | |
| 733 | static int x509_parse_ext_basic_constraints(struct x509_certificate *cert, |
| 734 | const u8 *pos, size_t len) |
| 735 | { |
| 736 | struct asn1_hdr hdr; |
| 737 | unsigned long value; |
| 738 | size_t left; |
| 739 | |
| 740 | /* |
| 741 | * BasicConstraints ::= SEQUENCE { |
| 742 | * cA BOOLEAN DEFAULT FALSE, |
| 743 | * pathLenConstraint INTEGER (0..MAX) OPTIONAL } |
| 744 | */ |
| 745 | |
| 746 | if (asn1_get_next(pos, len, &hdr) < 0 || |
| 747 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 748 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 749 | wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE in " |
| 750 | "BasicConstraints; found %d tag 0x%x", |
| 751 | hdr.class, hdr.tag); |
| 752 | return -1; |
| 753 | } |
| 754 | |
| 755 | cert->extensions_present |= X509_EXT_BASIC_CONSTRAINTS; |
| 756 | |
| 757 | if (hdr.length == 0) |
| 758 | return 0; |
| 759 | |
| 760 | if (asn1_get_next(hdr.payload, hdr.length, &hdr) < 0 || |
| 761 | hdr.class != ASN1_CLASS_UNIVERSAL) { |
| 762 | wpa_printf(MSG_DEBUG, "X509: Failed to parse " |
| 763 | "BasicConstraints"); |
| 764 | return -1; |
| 765 | } |
| 766 | |
| 767 | if (hdr.tag == ASN1_TAG_BOOLEAN) { |
| 768 | if (hdr.length != 1) { |
| 769 | wpa_printf(MSG_DEBUG, "X509: Unexpected " |
| 770 | "Boolean length (%u) in BasicConstraints", |
| 771 | hdr.length); |
| 772 | return -1; |
| 773 | } |
| 774 | cert->ca = hdr.payload[0]; |
| 775 | |
| 776 | if (hdr.payload + hdr.length == pos + len) { |
| 777 | wpa_printf(MSG_DEBUG, "X509: BasicConstraints - cA=%d", |
| 778 | cert->ca); |
| 779 | return 0; |
| 780 | } |
| 781 | |
| 782 | if (asn1_get_next(hdr.payload + hdr.length, len - hdr.length, |
| 783 | &hdr) < 0 || |
| 784 | hdr.class != ASN1_CLASS_UNIVERSAL) { |
| 785 | wpa_printf(MSG_DEBUG, "X509: Failed to parse " |
| 786 | "BasicConstraints"); |
| 787 | return -1; |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | if (hdr.tag != ASN1_TAG_INTEGER) { |
| 792 | wpa_printf(MSG_DEBUG, "X509: Expected INTEGER in " |
| 793 | "BasicConstraints; found class %d tag 0x%x", |
| 794 | hdr.class, hdr.tag); |
| 795 | return -1; |
| 796 | } |
| 797 | |
| 798 | pos = hdr.payload; |
| 799 | left = hdr.length; |
| 800 | value = 0; |
| 801 | while (left) { |
| 802 | value <<= 8; |
| 803 | value |= *pos++; |
| 804 | left--; |
| 805 | } |
| 806 | |
| 807 | cert->path_len_constraint = value; |
| 808 | cert->extensions_present |= X509_EXT_PATH_LEN_CONSTRAINT; |
| 809 | |
| 810 | wpa_printf(MSG_DEBUG, "X509: BasicConstraints - cA=%d " |
| 811 | "pathLenConstraint=%lu", |
| 812 | cert->ca, cert->path_len_constraint); |
| 813 | |
| 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | |
| 818 | static int x509_parse_extension_data(struct x509_certificate *cert, |
| 819 | struct asn1_oid *oid, |
| 820 | const u8 *pos, size_t len) |
| 821 | { |
| 822 | if (!x509_id_ce_oid(oid)) |
| 823 | return 1; |
| 824 | |
| 825 | /* TODO: add other extensions required by RFC 3280, Ch 4.2: |
| 826 | * certificate policies (section 4.2.1.5) |
| 827 | * the subject alternative name (section 4.2.1.7) |
| 828 | * name constraints (section 4.2.1.11) |
| 829 | * policy constraints (section 4.2.1.12) |
| 830 | * extended key usage (section 4.2.1.13) |
| 831 | * inhibit any-policy (section 4.2.1.15) |
| 832 | */ |
| 833 | switch (oid->oid[3]) { |
| 834 | case 15: /* id-ce-keyUsage */ |
| 835 | return x509_parse_ext_key_usage(cert, pos, len); |
| 836 | case 19: /* id-ce-basicConstraints */ |
| 837 | return x509_parse_ext_basic_constraints(cert, pos, len); |
| 838 | default: |
| 839 | return 1; |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | |
| 844 | static int x509_parse_extension(struct x509_certificate *cert, |
| 845 | const u8 *pos, size_t len, const u8 **next) |
| 846 | { |
| 847 | const u8 *end; |
| 848 | struct asn1_hdr hdr; |
| 849 | struct asn1_oid oid; |
| 850 | int critical_ext = 0, res; |
| 851 | char buf[80]; |
| 852 | |
| 853 | /* |
| 854 | * Extension ::= SEQUENCE { |
| 855 | * extnID OBJECT IDENTIFIER, |
| 856 | * critical BOOLEAN DEFAULT FALSE, |
| 857 | * extnValue OCTET STRING |
| 858 | * } |
| 859 | */ |
| 860 | |
| 861 | if (asn1_get_next(pos, len, &hdr) < 0 || |
| 862 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 863 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 864 | wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 header in " |
| 865 | "Extensions: class %d tag 0x%x; expected SEQUENCE", |
| 866 | hdr.class, hdr.tag); |
| 867 | return -1; |
| 868 | } |
| 869 | pos = hdr.payload; |
| 870 | *next = end = pos + hdr.length; |
| 871 | |
| 872 | if (asn1_get_oid(pos, end - pos, &oid, &pos) < 0) { |
| 873 | wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 data for " |
| 874 | "Extension (expected OID)"); |
| 875 | return -1; |
| 876 | } |
| 877 | |
| 878 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 879 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 880 | (hdr.tag != ASN1_TAG_BOOLEAN && |
| 881 | hdr.tag != ASN1_TAG_OCTETSTRING)) { |
| 882 | wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 header in " |
| 883 | "Extensions: class %d tag 0x%x; expected BOOLEAN " |
| 884 | "or OCTET STRING", hdr.class, hdr.tag); |
| 885 | return -1; |
| 886 | } |
| 887 | |
| 888 | if (hdr.tag == ASN1_TAG_BOOLEAN) { |
| 889 | if (hdr.length != 1) { |
| 890 | wpa_printf(MSG_DEBUG, "X509: Unexpected " |
| 891 | "Boolean length (%u)", hdr.length); |
| 892 | return -1; |
| 893 | } |
| 894 | critical_ext = hdr.payload[0]; |
| 895 | pos = hdr.payload; |
| 896 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 897 | (hdr.class != ASN1_CLASS_UNIVERSAL && |
| 898 | hdr.class != ASN1_CLASS_PRIVATE) || |
| 899 | hdr.tag != ASN1_TAG_OCTETSTRING) { |
| 900 | wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 header " |
| 901 | "in Extensions: class %d tag 0x%x; " |
| 902 | "expected OCTET STRING", |
| 903 | hdr.class, hdr.tag); |
| 904 | return -1; |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | asn1_oid_to_str(&oid, buf, sizeof(buf)); |
| 909 | wpa_printf(MSG_DEBUG, "X509: Extension: extnID=%s critical=%d", |
| 910 | buf, critical_ext); |
| 911 | wpa_hexdump(MSG_MSGDUMP, "X509: extnValue", hdr.payload, hdr.length); |
| 912 | |
| 913 | res = x509_parse_extension_data(cert, &oid, hdr.payload, hdr.length); |
| 914 | if (res < 0) |
| 915 | return res; |
| 916 | if (res == 1 && critical_ext) { |
| 917 | wpa_printf(MSG_INFO, "X509: Unknown critical extension %s", |
| 918 | buf); |
| 919 | return -1; |
| 920 | } |
| 921 | |
| 922 | return 0; |
| 923 | } |
| 924 | |
| 925 | |
| 926 | static int x509_parse_extensions(struct x509_certificate *cert, |
| 927 | const u8 *pos, size_t len) |
| 928 | { |
| 929 | const u8 *end; |
| 930 | struct asn1_hdr hdr; |
| 931 | |
| 932 | /* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension */ |
| 933 | |
| 934 | if (asn1_get_next(pos, len, &hdr) < 0 || |
| 935 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 936 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 937 | wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 data " |
| 938 | "for Extensions: class %d tag 0x%x; " |
| 939 | "expected SEQUENCE", hdr.class, hdr.tag); |
| 940 | return -1; |
| 941 | } |
| 942 | |
| 943 | pos = hdr.payload; |
| 944 | end = pos + hdr.length; |
| 945 | |
| 946 | while (pos < end) { |
| 947 | if (x509_parse_extension(cert, pos, end - pos, &pos) |
| 948 | < 0) |
| 949 | return -1; |
| 950 | } |
| 951 | |
| 952 | return 0; |
| 953 | } |
| 954 | |
| 955 | |
| 956 | static int x509_parse_tbs_certificate(const u8 *buf, size_t len, |
| 957 | struct x509_certificate *cert, |
| 958 | const u8 **next) |
| 959 | { |
| 960 | struct asn1_hdr hdr; |
| 961 | const u8 *pos, *end; |
| 962 | size_t left; |
| 963 | char sbuf[128]; |
| 964 | unsigned long value; |
| 965 | |
| 966 | /* tbsCertificate TBSCertificate ::= SEQUENCE */ |
| 967 | if (asn1_get_next(buf, len, &hdr) < 0 || |
| 968 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 969 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 970 | wpa_printf(MSG_DEBUG, "X509: tbsCertificate did not start " |
| 971 | "with a valid SEQUENCE - found class %d tag 0x%x", |
| 972 | hdr.class, hdr.tag); |
| 973 | return -1; |
| 974 | } |
| 975 | pos = hdr.payload; |
| 976 | end = *next = pos + hdr.length; |
| 977 | |
| 978 | /* |
| 979 | * version [0] EXPLICIT Version DEFAULT v1 |
| 980 | * Version ::= INTEGER { v1(0), v2(1), v3(2) } |
| 981 | */ |
| 982 | if (asn1_get_next(pos, end - pos, &hdr) < 0) |
| 983 | return -1; |
| 984 | pos = hdr.payload; |
| 985 | |
| 986 | if (hdr.class == ASN1_CLASS_CONTEXT_SPECIFIC) { |
| 987 | if (asn1_get_next(pos, end - pos, &hdr) < 0) |
| 988 | return -1; |
| 989 | |
| 990 | if (hdr.class != ASN1_CLASS_UNIVERSAL || |
| 991 | hdr.tag != ASN1_TAG_INTEGER) { |
| 992 | wpa_printf(MSG_DEBUG, "X509: No INTEGER tag found for " |
| 993 | "version field - found class %d tag 0x%x", |
| 994 | hdr.class, hdr.tag); |
| 995 | return -1; |
| 996 | } |
| 997 | if (hdr.length != 1) { |
| 998 | wpa_printf(MSG_DEBUG, "X509: Unexpected version field " |
| 999 | "length %u (expected 1)", hdr.length); |
| 1000 | return -1; |
| 1001 | } |
| 1002 | pos = hdr.payload; |
| 1003 | left = hdr.length; |
| 1004 | value = 0; |
| 1005 | while (left) { |
| 1006 | value <<= 8; |
| 1007 | value |= *pos++; |
| 1008 | left--; |
| 1009 | } |
| 1010 | |
| 1011 | cert->version = value; |
| 1012 | if (cert->version != X509_CERT_V1 && |
| 1013 | cert->version != X509_CERT_V2 && |
| 1014 | cert->version != X509_CERT_V3) { |
| 1015 | wpa_printf(MSG_DEBUG, "X509: Unsupported version %d", |
| 1016 | cert->version + 1); |
| 1017 | return -1; |
| 1018 | } |
| 1019 | |
| 1020 | if (asn1_get_next(pos, end - pos, &hdr) < 0) |
| 1021 | return -1; |
| 1022 | } else |
| 1023 | cert->version = X509_CERT_V1; |
| 1024 | wpa_printf(MSG_MSGDUMP, "X509: Version X.509v%d", cert->version + 1); |
| 1025 | |
| 1026 | /* serialNumber CertificateSerialNumber ::= INTEGER */ |
| 1027 | if (hdr.class != ASN1_CLASS_UNIVERSAL || |
| 1028 | hdr.tag != ASN1_TAG_INTEGER) { |
| 1029 | wpa_printf(MSG_DEBUG, "X509: No INTEGER tag found for " |
| 1030 | "serialNumber; class=%d tag=0x%x", |
| 1031 | hdr.class, hdr.tag); |
| 1032 | return -1; |
| 1033 | } |
| 1034 | |
| 1035 | pos = hdr.payload; |
| 1036 | left = hdr.length; |
| 1037 | while (left) { |
| 1038 | cert->serial_number <<= 8; |
| 1039 | cert->serial_number |= *pos++; |
| 1040 | left--; |
| 1041 | } |
| 1042 | wpa_printf(MSG_MSGDUMP, "X509: serialNumber %lu", cert->serial_number); |
| 1043 | |
| 1044 | /* signature AlgorithmIdentifier */ |
| 1045 | if (x509_parse_algorithm_identifier(pos, end - pos, &cert->signature, |
| 1046 | &pos)) |
| 1047 | return -1; |
| 1048 | |
| 1049 | /* issuer Name */ |
| 1050 | if (x509_parse_name(pos, end - pos, &cert->issuer, &pos)) |
| 1051 | return -1; |
| 1052 | x509_name_string(&cert->issuer, sbuf, sizeof(sbuf)); |
| 1053 | wpa_printf(MSG_MSGDUMP, "X509: issuer %s", sbuf); |
| 1054 | |
| 1055 | /* validity Validity */ |
| 1056 | if (x509_parse_validity(pos, end - pos, cert, &pos)) |
| 1057 | return -1; |
| 1058 | |
| 1059 | /* subject Name */ |
| 1060 | if (x509_parse_name(pos, end - pos, &cert->subject, &pos)) |
| 1061 | return -1; |
| 1062 | x509_name_string(&cert->subject, sbuf, sizeof(sbuf)); |
| 1063 | wpa_printf(MSG_MSGDUMP, "X509: subject %s", sbuf); |
| 1064 | |
| 1065 | /* subjectPublicKeyInfo SubjectPublicKeyInfo */ |
| 1066 | if (x509_parse_public_key(pos, end - pos, cert, &pos)) |
| 1067 | return -1; |
| 1068 | |
| 1069 | if (pos == end) |
| 1070 | return 0; |
| 1071 | |
| 1072 | if (cert->version == X509_CERT_V1) |
| 1073 | return 0; |
| 1074 | |
| 1075 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 1076 | hdr.class != ASN1_CLASS_CONTEXT_SPECIFIC) { |
| 1077 | wpa_printf(MSG_DEBUG, "X509: Expected Context-Specific" |
| 1078 | " tag to parse optional tbsCertificate " |
| 1079 | "field(s); parsed class %d tag 0x%x", |
| 1080 | hdr.class, hdr.tag); |
| 1081 | return -1; |
| 1082 | } |
| 1083 | |
| 1084 | if (hdr.tag == 1) { |
| 1085 | /* issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL */ |
| 1086 | wpa_printf(MSG_DEBUG, "X509: issuerUniqueID"); |
| 1087 | /* TODO: parse UniqueIdentifier ::= BIT STRING */ |
| 1088 | |
| 1089 | if (hdr.payload + hdr.length == end) |
| 1090 | return 0; |
| 1091 | |
| 1092 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 1093 | hdr.class != ASN1_CLASS_CONTEXT_SPECIFIC) { |
| 1094 | wpa_printf(MSG_DEBUG, "X509: Expected Context-Specific" |
| 1095 | " tag to parse optional tbsCertificate " |
| 1096 | "field(s); parsed class %d tag 0x%x", |
| 1097 | hdr.class, hdr.tag); |
| 1098 | return -1; |
| 1099 | } |
| 1100 | } |
| 1101 | |
| 1102 | if (hdr.tag == 2) { |
| 1103 | /* subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL */ |
| 1104 | wpa_printf(MSG_DEBUG, "X509: subjectUniqueID"); |
| 1105 | /* TODO: parse UniqueIdentifier ::= BIT STRING */ |
| 1106 | |
| 1107 | if (hdr.payload + hdr.length == end) |
| 1108 | return 0; |
| 1109 | |
| 1110 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 1111 | hdr.class != ASN1_CLASS_CONTEXT_SPECIFIC) { |
| 1112 | wpa_printf(MSG_DEBUG, "X509: Expected Context-Specific" |
| 1113 | " tag to parse optional tbsCertificate " |
| 1114 | "field(s); parsed class %d tag 0x%x", |
| 1115 | hdr.class, hdr.tag); |
| 1116 | return -1; |
| 1117 | } |
| 1118 | } |
| 1119 | |
| 1120 | if (hdr.tag != 3) { |
| 1121 | wpa_printf(MSG_DEBUG, "X509: Ignored unexpected " |
| 1122 | "Context-Specific tag %d in optional " |
| 1123 | "tbsCertificate fields", hdr.tag); |
| 1124 | return 0; |
| 1125 | } |
| 1126 | |
| 1127 | /* extensions [3] EXPLICIT Extensions OPTIONAL */ |
| 1128 | |
| 1129 | if (cert->version != X509_CERT_V3) { |
| 1130 | wpa_printf(MSG_DEBUG, "X509: X.509%d certificate and " |
| 1131 | "Extensions data which are only allowed for " |
| 1132 | "version 3", cert->version + 1); |
| 1133 | return -1; |
| 1134 | } |
| 1135 | |
| 1136 | if (x509_parse_extensions(cert, hdr.payload, hdr.length) < 0) |
| 1137 | return -1; |
| 1138 | |
| 1139 | pos = hdr.payload + hdr.length; |
| 1140 | if (pos < end) { |
| 1141 | wpa_hexdump(MSG_DEBUG, |
| 1142 | "X509: Ignored extra tbsCertificate data", |
| 1143 | pos, end - pos); |
| 1144 | } |
| 1145 | |
| 1146 | return 0; |
| 1147 | } |
| 1148 | |
| 1149 | |
| 1150 | static int x509_rsadsi_oid(struct asn1_oid *oid) |
| 1151 | { |
| 1152 | return oid->len >= 4 && |
| 1153 | oid->oid[0] == 1 /* iso */ && |
| 1154 | oid->oid[1] == 2 /* member-body */ && |
| 1155 | oid->oid[2] == 840 /* us */ && |
| 1156 | oid->oid[3] == 113549 /* rsadsi */; |
| 1157 | } |
| 1158 | |
| 1159 | |
| 1160 | static int x509_pkcs_oid(struct asn1_oid *oid) |
| 1161 | { |
| 1162 | return oid->len >= 5 && |
| 1163 | x509_rsadsi_oid(oid) && |
| 1164 | oid->oid[4] == 1 /* pkcs */; |
| 1165 | } |
| 1166 | |
| 1167 | |
| 1168 | static int x509_digest_oid(struct asn1_oid *oid) |
| 1169 | { |
| 1170 | return oid->len >= 5 && |
| 1171 | x509_rsadsi_oid(oid) && |
| 1172 | oid->oid[4] == 2 /* digestAlgorithm */; |
| 1173 | } |
| 1174 | |
| 1175 | |
| 1176 | static int x509_sha1_oid(struct asn1_oid *oid) |
| 1177 | { |
| 1178 | return oid->len == 6 && |
| 1179 | oid->oid[0] == 1 /* iso */ && |
| 1180 | oid->oid[1] == 3 /* identified-organization */ && |
| 1181 | oid->oid[2] == 14 /* oiw */ && |
| 1182 | oid->oid[3] == 3 /* secsig */ && |
| 1183 | oid->oid[4] == 2 /* algorithms */ && |
| 1184 | oid->oid[5] == 26 /* id-sha1 */; |
| 1185 | } |
| 1186 | |
| 1187 | |
| 1188 | /** |
| 1189 | * x509_certificate_parse - Parse a X.509 certificate in DER format |
| 1190 | * @buf: Pointer to the X.509 certificate in DER format |
| 1191 | * @len: Buffer length |
| 1192 | * Returns: Pointer to the parsed certificate or %NULL on failure |
| 1193 | * |
| 1194 | * Caller is responsible for freeing the returned certificate by calling |
| 1195 | * x509_certificate_free(). |
| 1196 | */ |
| 1197 | struct x509_certificate * x509_certificate_parse(const u8 *buf, size_t len) |
| 1198 | { |
| 1199 | struct asn1_hdr hdr; |
| 1200 | const u8 *pos, *end, *hash_start; |
| 1201 | struct x509_certificate *cert; |
| 1202 | |
| 1203 | cert = os_zalloc(sizeof(*cert) + len); |
| 1204 | if (cert == NULL) |
| 1205 | return NULL; |
| 1206 | os_memcpy(cert + 1, buf, len); |
| 1207 | cert->cert_start = (u8 *) (cert + 1); |
| 1208 | cert->cert_len = len; |
| 1209 | |
| 1210 | pos = buf; |
| 1211 | end = buf + len; |
| 1212 | |
| 1213 | /* RFC 3280 - X.509 v3 certificate / ASN.1 DER */ |
| 1214 | |
| 1215 | /* Certificate ::= SEQUENCE */ |
| 1216 | if (asn1_get_next(pos, len, &hdr) < 0 || |
| 1217 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 1218 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 1219 | wpa_printf(MSG_DEBUG, "X509: Certificate did not start with " |
| 1220 | "a valid SEQUENCE - found class %d tag 0x%x", |
| 1221 | hdr.class, hdr.tag); |
| 1222 | x509_certificate_free(cert); |
| 1223 | return NULL; |
| 1224 | } |
| 1225 | pos = hdr.payload; |
| 1226 | |
| 1227 | if (pos + hdr.length > end) { |
| 1228 | x509_certificate_free(cert); |
| 1229 | return NULL; |
| 1230 | } |
| 1231 | |
| 1232 | if (pos + hdr.length < end) { |
| 1233 | wpa_hexdump(MSG_MSGDUMP, "X509: Ignoring extra data after DER " |
| 1234 | "encoded certificate", |
| 1235 | pos + hdr.length, end - pos + hdr.length); |
| 1236 | end = pos + hdr.length; |
| 1237 | } |
| 1238 | |
| 1239 | hash_start = pos; |
| 1240 | cert->tbs_cert_start = cert->cert_start + (hash_start - buf); |
| 1241 | if (x509_parse_tbs_certificate(pos, end - pos, cert, &pos)) { |
| 1242 | x509_certificate_free(cert); |
| 1243 | return NULL; |
| 1244 | } |
| 1245 | cert->tbs_cert_len = pos - hash_start; |
| 1246 | |
| 1247 | /* signatureAlgorithm AlgorithmIdentifier */ |
| 1248 | if (x509_parse_algorithm_identifier(pos, end - pos, |
| 1249 | &cert->signature_alg, &pos)) { |
| 1250 | x509_certificate_free(cert); |
| 1251 | return NULL; |
| 1252 | } |
| 1253 | |
| 1254 | /* signatureValue BIT STRING */ |
| 1255 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 1256 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 1257 | hdr.tag != ASN1_TAG_BITSTRING) { |
| 1258 | wpa_printf(MSG_DEBUG, "X509: Expected BITSTRING " |
| 1259 | "(signatureValue) - found class %d tag 0x%x", |
| 1260 | hdr.class, hdr.tag); |
| 1261 | x509_certificate_free(cert); |
| 1262 | return NULL; |
| 1263 | } |
| 1264 | if (hdr.length < 1) { |
| 1265 | x509_certificate_free(cert); |
| 1266 | return NULL; |
| 1267 | } |
| 1268 | pos = hdr.payload; |
| 1269 | if (*pos) { |
| 1270 | wpa_printf(MSG_DEBUG, "X509: BITSTRING - %d unused bits", |
| 1271 | *pos); |
| 1272 | /* PKCS #1 v1.5 10.2.1: |
| 1273 | * It is an error if the length in bits of the signature S is |
| 1274 | * not a multiple of eight. |
| 1275 | */ |
| 1276 | x509_certificate_free(cert); |
| 1277 | return NULL; |
| 1278 | } |
| 1279 | os_free(cert->sign_value); |
| 1280 | cert->sign_value = os_malloc(hdr.length - 1); |
| 1281 | if (cert->sign_value == NULL) { |
| 1282 | wpa_printf(MSG_DEBUG, "X509: Failed to allocate memory for " |
| 1283 | "signatureValue"); |
| 1284 | x509_certificate_free(cert); |
| 1285 | return NULL; |
| 1286 | } |
| 1287 | os_memcpy(cert->sign_value, pos + 1, hdr.length - 1); |
| 1288 | cert->sign_value_len = hdr.length - 1; |
| 1289 | wpa_hexdump(MSG_MSGDUMP, "X509: signature", |
| 1290 | cert->sign_value, cert->sign_value_len); |
| 1291 | |
| 1292 | return cert; |
| 1293 | } |
| 1294 | |
| 1295 | |
| 1296 | /** |
| 1297 | * x509_certificate_check_signature - Verify certificate signature |
| 1298 | * @issuer: Issuer certificate |
| 1299 | * @cert: Certificate to be verified |
| 1300 | * Returns: 0 if cert has a valid signature that was signed by the issuer, |
| 1301 | * -1 if not |
| 1302 | */ |
| 1303 | int x509_certificate_check_signature(struct x509_certificate *issuer, |
| 1304 | struct x509_certificate *cert) |
| 1305 | { |
| 1306 | struct crypto_public_key *pk; |
| 1307 | u8 *data; |
| 1308 | const u8 *pos, *end, *next, *da_end; |
| 1309 | size_t data_len; |
| 1310 | struct asn1_hdr hdr; |
| 1311 | struct asn1_oid oid; |
| 1312 | u8 hash[20]; |
| 1313 | size_t hash_len; |
| 1314 | |
| 1315 | if (!x509_pkcs_oid(&cert->signature.oid) || |
| 1316 | cert->signature.oid.len != 7 || |
| 1317 | cert->signature.oid.oid[5] != 1 /* pkcs-1 */) { |
| 1318 | wpa_printf(MSG_DEBUG, "X509: Unrecognized signature " |
| 1319 | "algorithm"); |
| 1320 | return -1; |
| 1321 | } |
| 1322 | |
| 1323 | pk = crypto_public_key_import(issuer->public_key, |
| 1324 | issuer->public_key_len); |
| 1325 | if (pk == NULL) |
| 1326 | return -1; |
| 1327 | |
| 1328 | data_len = cert->sign_value_len; |
| 1329 | data = os_malloc(data_len); |
| 1330 | if (data == NULL) { |
| 1331 | crypto_public_key_free(pk); |
| 1332 | return -1; |
| 1333 | } |
| 1334 | |
| 1335 | if (crypto_public_key_decrypt_pkcs1(pk, cert->sign_value, |
| 1336 | cert->sign_value_len, data, |
| 1337 | &data_len) < 0) { |
| 1338 | wpa_printf(MSG_DEBUG, "X509: Failed to decrypt signature"); |
| 1339 | crypto_public_key_free(pk); |
| 1340 | os_free(data); |
| 1341 | return -1; |
| 1342 | } |
| 1343 | crypto_public_key_free(pk); |
| 1344 | |
| 1345 | wpa_hexdump(MSG_MSGDUMP, "X509: Signature data D", data, data_len); |
| 1346 | |
| 1347 | /* |
| 1348 | * PKCS #1 v1.5, 10.1.2: |
| 1349 | * |
| 1350 | * DigestInfo ::= SEQUENCE { |
| 1351 | * digestAlgorithm DigestAlgorithmIdentifier, |
| 1352 | * digest Digest |
| 1353 | * } |
| 1354 | * |
| 1355 | * DigestAlgorithmIdentifier ::= AlgorithmIdentifier |
| 1356 | * |
| 1357 | * Digest ::= OCTET STRING |
| 1358 | * |
| 1359 | */ |
| 1360 | if (asn1_get_next(data, data_len, &hdr) < 0 || |
| 1361 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 1362 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 1363 | wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE " |
| 1364 | "(DigestInfo) - found class %d tag 0x%x", |
| 1365 | hdr.class, hdr.tag); |
| 1366 | os_free(data); |
| 1367 | return -1; |
| 1368 | } |
| 1369 | |
| 1370 | pos = hdr.payload; |
| 1371 | end = pos + hdr.length; |
| 1372 | |
| 1373 | /* |
| 1374 | * X.509: |
| 1375 | * AlgorithmIdentifier ::= SEQUENCE { |
| 1376 | * algorithm OBJECT IDENTIFIER, |
| 1377 | * parameters ANY DEFINED BY algorithm OPTIONAL |
| 1378 | * } |
| 1379 | */ |
| 1380 | |
| 1381 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 1382 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 1383 | hdr.tag != ASN1_TAG_SEQUENCE) { |
| 1384 | wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE " |
| 1385 | "(AlgorithmIdentifier) - found class %d tag 0x%x", |
| 1386 | hdr.class, hdr.tag); |
| 1387 | os_free(data); |
| 1388 | return -1; |
| 1389 | } |
| 1390 | da_end = hdr.payload + hdr.length; |
| 1391 | |
| 1392 | if (asn1_get_oid(hdr.payload, hdr.length, &oid, &next)) { |
| 1393 | wpa_printf(MSG_DEBUG, "X509: Failed to parse digestAlgorithm"); |
| 1394 | os_free(data); |
| 1395 | return -1; |
| 1396 | } |
| 1397 | |
| 1398 | if (x509_sha1_oid(&oid)) { |
| 1399 | if (cert->signature.oid.oid[6] != |
| 1400 | 5 /* sha-1WithRSAEncryption */) { |
| 1401 | wpa_printf(MSG_DEBUG, "X509: digestAlgorithm SHA1 " |
| 1402 | "does not match with certificate " |
| 1403 | "signatureAlgorithm (%lu)", |
| 1404 | cert->signature.oid.oid[6]); |
| 1405 | os_free(data); |
| 1406 | return -1; |
| 1407 | } |
| 1408 | goto skip_digest_oid; |
| 1409 | } |
| 1410 | |
| 1411 | if (!x509_digest_oid(&oid)) { |
| 1412 | wpa_printf(MSG_DEBUG, "X509: Unrecognized digestAlgorithm"); |
| 1413 | os_free(data); |
| 1414 | return -1; |
| 1415 | } |
| 1416 | switch (oid.oid[5]) { |
| 1417 | case 5: /* md5 */ |
| 1418 | if (cert->signature.oid.oid[6] != 4 /* md5WithRSAEncryption */) |
| 1419 | { |
| 1420 | wpa_printf(MSG_DEBUG, "X509: digestAlgorithm MD5 does " |
| 1421 | "not match with certificate " |
| 1422 | "signatureAlgorithm (%lu)", |
| 1423 | cert->signature.oid.oid[6]); |
| 1424 | os_free(data); |
| 1425 | return -1; |
| 1426 | } |
| 1427 | break; |
| 1428 | case 2: /* md2 */ |
| 1429 | case 4: /* md4 */ |
| 1430 | default: |
| 1431 | wpa_printf(MSG_DEBUG, "X509: Unsupported digestAlgorithm " |
| 1432 | "(%lu)", oid.oid[5]); |
| 1433 | os_free(data); |
| 1434 | return -1; |
| 1435 | } |
| 1436 | |
| 1437 | skip_digest_oid: |
| 1438 | /* Digest ::= OCTET STRING */ |
| 1439 | pos = da_end; |
| 1440 | end = data + data_len; |
| 1441 | |
| 1442 | if (asn1_get_next(pos, end - pos, &hdr) < 0 || |
| 1443 | hdr.class != ASN1_CLASS_UNIVERSAL || |
| 1444 | hdr.tag != ASN1_TAG_OCTETSTRING) { |
| 1445 | wpa_printf(MSG_DEBUG, "X509: Expected OCTETSTRING " |
| 1446 | "(Digest) - found class %d tag 0x%x", |
| 1447 | hdr.class, hdr.tag); |
| 1448 | os_free(data); |
| 1449 | return -1; |
| 1450 | } |
| 1451 | wpa_hexdump(MSG_MSGDUMP, "X509: Decrypted Digest", |
| 1452 | hdr.payload, hdr.length); |
| 1453 | |
| 1454 | switch (cert->signature.oid.oid[6]) { |
| 1455 | case 4: /* md5WithRSAEncryption */ |
| 1456 | md5_vector(1, &cert->tbs_cert_start, &cert->tbs_cert_len, |
| 1457 | hash); |
| 1458 | hash_len = 16; |
| 1459 | wpa_hexdump(MSG_MSGDUMP, "X509: Certificate hash (MD5)", |
| 1460 | hash, hash_len); |
| 1461 | break; |
| 1462 | case 5: /* sha-1WithRSAEncryption */ |
| 1463 | sha1_vector(1, &cert->tbs_cert_start, &cert->tbs_cert_len, |
| 1464 | hash); |
| 1465 | hash_len = 20; |
| 1466 | wpa_hexdump(MSG_MSGDUMP, "X509: Certificate hash (SHA1)", |
| 1467 | hash, hash_len); |
| 1468 | break; |
| 1469 | case 2: /* md2WithRSAEncryption */ |
| 1470 | case 11: /* sha256WithRSAEncryption */ |
| 1471 | case 12: /* sha384WithRSAEncryption */ |
| 1472 | case 13: /* sha512WithRSAEncryption */ |
| 1473 | default: |
| 1474 | wpa_printf(MSG_INFO, "X509: Unsupported certificate signature " |
| 1475 | "algorithm (%lu)", cert->signature.oid.oid[6]); |
| 1476 | os_free(data); |
| 1477 | return -1; |
| 1478 | } |
| 1479 | |
| 1480 | if (hdr.length != hash_len || |
| 1481 | os_memcmp(hdr.payload, hash, hdr.length) != 0) { |
| 1482 | wpa_printf(MSG_INFO, "X509: Certificate Digest does not match " |
| 1483 | "with calculated tbsCertificate hash"); |
| 1484 | os_free(data); |
| 1485 | return -1; |
| 1486 | } |
| 1487 | |
| 1488 | os_free(data); |
| 1489 | |
| 1490 | wpa_printf(MSG_DEBUG, "X509: Certificate Digest matches with " |
| 1491 | "calculated tbsCertificate hash"); |
| 1492 | |
| 1493 | return 0; |
| 1494 | } |
| 1495 | |
| 1496 | |
| 1497 | static int x509_valid_issuer(const struct x509_certificate *cert) |
| 1498 | { |
| 1499 | if ((cert->extensions_present & X509_EXT_BASIC_CONSTRAINTS) && |
| 1500 | !cert->ca) { |
| 1501 | wpa_printf(MSG_DEBUG, "X509: Non-CA certificate used as an " |
| 1502 | "issuer"); |
| 1503 | return -1; |
| 1504 | } |
| 1505 | |
| 1506 | if (cert->version == X509_CERT_V3 && |
| 1507 | !(cert->extensions_present & X509_EXT_BASIC_CONSTRAINTS)) { |
| 1508 | wpa_printf(MSG_DEBUG, "X509: v3 CA certificate did not " |
| 1509 | "include BasicConstraints extension"); |
| 1510 | return -1; |
| 1511 | } |
| 1512 | |
| 1513 | if ((cert->extensions_present & X509_EXT_KEY_USAGE) && |
| 1514 | !(cert->key_usage & X509_KEY_USAGE_KEY_CERT_SIGN)) { |
| 1515 | wpa_printf(MSG_DEBUG, "X509: Issuer certificate did not have " |
| 1516 | "keyCertSign bit in Key Usage"); |
| 1517 | return -1; |
| 1518 | } |
| 1519 | |
| 1520 | return 0; |
| 1521 | } |
| 1522 | |
| 1523 | |
| 1524 | /** |
| 1525 | * x509_certificate_chain_validate - Validate X.509 certificate chain |
| 1526 | * @trusted: List of trusted certificates |
| 1527 | * @chain: Certificate chain to be validated (first chain must be issued by |
| 1528 | * signed by the second certificate in the chain and so on) |
| 1529 | * @reason: Buffer for returning failure reason (X509_VALIDATE_*) |
| 1530 | * Returns: 0 if chain is valid, -1 if not |
| 1531 | */ |
| 1532 | int x509_certificate_chain_validate(struct x509_certificate *trusted, |
| 1533 | struct x509_certificate *chain, |
| 1534 | int *reason) |
| 1535 | { |
| 1536 | long unsigned idx; |
| 1537 | int chain_trusted = 0; |
| 1538 | struct x509_certificate *cert, *trust; |
| 1539 | char buf[128]; |
| 1540 | struct os_time now; |
| 1541 | |
| 1542 | *reason = X509_VALIDATE_OK; |
| 1543 | |
| 1544 | wpa_printf(MSG_DEBUG, "X509: Validate certificate chain"); |
| 1545 | os_get_time(&now); |
| 1546 | |
| 1547 | for (cert = chain, idx = 0; cert; cert = cert->next, idx++) { |
| 1548 | x509_name_string(&cert->subject, buf, sizeof(buf)); |
| 1549 | wpa_printf(MSG_DEBUG, "X509: %lu: %s", idx, buf); |
| 1550 | |
| 1551 | if (chain_trusted) |
| 1552 | continue; |
| 1553 | |
| 1554 | if ((unsigned long) now.sec < |
| 1555 | (unsigned long) cert->not_before || |
| 1556 | (unsigned long) now.sec > |
| 1557 | (unsigned long) cert->not_after) { |
| 1558 | wpa_printf(MSG_INFO, "X509: Certificate not valid " |
| 1559 | "(now=%lu not_before=%lu not_after=%lu)", |
| 1560 | now.sec, cert->not_before, cert->not_after); |
| 1561 | *reason = X509_VALIDATE_CERTIFICATE_EXPIRED; |
| 1562 | return -1; |
| 1563 | } |
| 1564 | |
| 1565 | if (cert->next) { |
| 1566 | if (x509_name_compare(&cert->issuer, |
| 1567 | &cert->next->subject) != 0) { |
| 1568 | wpa_printf(MSG_DEBUG, "X509: Certificate " |
| 1569 | "chain issuer name mismatch"); |
| 1570 | *reason = X509_VALIDATE_CERTIFICATE_UNKNOWN; |
| 1571 | return -1; |
| 1572 | } |
| 1573 | |
| 1574 | if (x509_valid_issuer(cert->next) < 0) { |
| 1575 | *reason = X509_VALIDATE_BAD_CERTIFICATE; |
| 1576 | return -1; |
| 1577 | } |
| 1578 | |
| 1579 | if ((cert->next->extensions_present & |
| 1580 | X509_EXT_PATH_LEN_CONSTRAINT) && |
| 1581 | idx > cert->next->path_len_constraint) { |
| 1582 | wpa_printf(MSG_DEBUG, "X509: pathLenConstraint" |
| 1583 | " not met (idx=%lu issuer " |
| 1584 | "pathLenConstraint=%lu)", idx, |
| 1585 | cert->next->path_len_constraint); |
| 1586 | *reason = X509_VALIDATE_BAD_CERTIFICATE; |
| 1587 | return -1; |
| 1588 | } |
| 1589 | |
| 1590 | if (x509_certificate_check_signature(cert->next, cert) |
| 1591 | < 0) { |
| 1592 | wpa_printf(MSG_DEBUG, "X509: Invalid " |
| 1593 | "certificate signature within " |
| 1594 | "chain"); |
| 1595 | *reason = X509_VALIDATE_BAD_CERTIFICATE; |
| 1596 | return -1; |
| 1597 | } |
| 1598 | } |
| 1599 | |
| 1600 | for (trust = trusted; trust; trust = trust->next) { |
| 1601 | if (x509_name_compare(&cert->issuer, &trust->subject) |
| 1602 | == 0) |
| 1603 | break; |
| 1604 | } |
| 1605 | |
| 1606 | if (trust) { |
| 1607 | wpa_printf(MSG_DEBUG, "X509: Found issuer from the " |
| 1608 | "list of trusted certificates"); |
| 1609 | if (x509_valid_issuer(trust) < 0) { |
| 1610 | *reason = X509_VALIDATE_BAD_CERTIFICATE; |
| 1611 | return -1; |
| 1612 | } |
| 1613 | |
| 1614 | if (x509_certificate_check_signature(trust, cert) < 0) |
| 1615 | { |
| 1616 | wpa_printf(MSG_DEBUG, "X509: Invalid " |
| 1617 | "certificate signature"); |
| 1618 | *reason = X509_VALIDATE_BAD_CERTIFICATE; |
| 1619 | return -1; |
| 1620 | } |
| 1621 | |
| 1622 | wpa_printf(MSG_DEBUG, "X509: Trusted certificate " |
| 1623 | "found to complete the chain"); |
| 1624 | chain_trusted = 1; |
| 1625 | } |
| 1626 | } |
| 1627 | |
| 1628 | if (!chain_trusted) { |
| 1629 | wpa_printf(MSG_DEBUG, "X509: Did not find any of the issuers " |
| 1630 | "from the list of trusted certificates"); |
| 1631 | if (trusted) { |
| 1632 | *reason = X509_VALIDATE_UNKNOWN_CA; |
| 1633 | return -1; |
| 1634 | } |
| 1635 | wpa_printf(MSG_DEBUG, "X509: Certificate chain validation " |
| 1636 | "disabled - ignore unknown CA issue"); |
| 1637 | } |
| 1638 | |
| 1639 | wpa_printf(MSG_DEBUG, "X509: Certificate chain valid"); |
| 1640 | |
| 1641 | return 0; |
| 1642 | } |
| 1643 | |
| 1644 | |
| 1645 | /** |
| 1646 | * x509_certificate_get_subject - Get a certificate based on Subject name |
| 1647 | * @chain: Certificate chain to search through |
| 1648 | * @name: Subject name to search for |
| 1649 | * Returns: Pointer to the certificate with the given Subject name or |
| 1650 | * %NULL on failure |
| 1651 | */ |
| 1652 | struct x509_certificate * |
| 1653 | x509_certificate_get_subject(struct x509_certificate *chain, |
| 1654 | struct x509_name *name) |
| 1655 | { |
| 1656 | struct x509_certificate *cert; |
| 1657 | |
| 1658 | for (cert = chain; cert; cert = cert->next) { |
| 1659 | if (x509_name_compare(&cert->subject, name) == 0) |
| 1660 | return cert; |
| 1661 | } |
| 1662 | return NULL; |
| 1663 | } |
| 1664 | |
| 1665 | |
| 1666 | /** |
| 1667 | * x509_certificate_self_signed - Is the certificate self-signed? |
| 1668 | * @cert: Certificate |
| 1669 | * Returns: 1 if certificate is self-signed, 0 if not |
| 1670 | */ |
| 1671 | int x509_certificate_self_signed(struct x509_certificate *cert) |
| 1672 | { |
| 1673 | return x509_name_compare(&cert->issuer, &cert->subject) == 0; |
| 1674 | } |
| 1675 | |
| 1676 | #endif /* CONFIG_INTERNAL_X509 */ |