1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* X.509 certificate parser 3 * 4 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #define pr_fmt(fmt) "X.509: "fmt 9 #include <linux/kernel.h> 10 #include <linux/export.h> 11 #include <linux/slab.h> 12 #include <linux/err.h> 13 #include <linux/oid_registry.h> 14 #include <crypto/public_key.h> 15 #include "x509_parser.h" 16 #include "x509.asn1.h" 17 #include "x509_akid.asn1.h" 18 19 struct x509_parse_context { 20 struct x509_certificate *cert; /* Certificate being constructed */ 21 unsigned long data; /* Start of data */ 22 const void *key; /* Key data */ 23 size_t key_size; /* Size of key data */ 24 const void *params; /* Key parameters */ 25 size_t params_size; /* Size of key parameters */ 26 enum OID key_algo; /* Algorithm used by the cert's key */ 27 enum OID last_oid; /* Last OID encountered */ 28 enum OID sig_algo; /* Algorithm used to sign the cert */ 29 u8 o_size; /* Size of organizationName (O) */ 30 u8 cn_size; /* Size of commonName (CN) */ 31 u8 email_size; /* Size of emailAddress */ 32 u16 o_offset; /* Offset of organizationName (O) */ 33 u16 cn_offset; /* Offset of commonName (CN) */ 34 u16 email_offset; /* Offset of emailAddress */ 35 unsigned raw_akid_size; 36 const void *raw_akid; /* Raw authorityKeyId in ASN.1 */ 37 const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */ 38 unsigned akid_raw_issuer_size; 39 }; 40 41 /* 42 * Free an X.509 certificate 43 */ 44 void x509_free_certificate(struct x509_certificate *cert) 45 { 46 if (cert) { 47 public_key_free(cert->pub); 48 public_key_signature_free(cert->sig); 49 kfree(cert->issuer); 50 kfree(cert->subject); 51 kfree(cert->id); 52 kfree(cert->skid); 53 kfree(cert); 54 } 55 } 56 EXPORT_SYMBOL_GPL(x509_free_certificate); 57 58 /* 59 * Parse an X.509 certificate 60 */ 61 struct x509_certificate *x509_cert_parse(const void *data, size_t datalen) 62 { 63 struct x509_certificate *cert __free(x509_free_certificate); 64 struct x509_parse_context *ctx __free(kfree) = NULL; 65 struct asymmetric_key_id *kid; 66 long ret; 67 68 cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL); 69 if (!cert) 70 return ERR_PTR(-ENOMEM); 71 cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL); 72 if (!cert->pub) 73 return ERR_PTR(-ENOMEM); 74 cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL); 75 if (!cert->sig) 76 return ERR_PTR(-ENOMEM); 77 ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL); 78 if (!ctx) 79 return ERR_PTR(-ENOMEM); 80 81 ctx->cert = cert; 82 ctx->data = (unsigned long)data; 83 84 /* Attempt to decode the certificate */ 85 ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen); 86 if (ret < 0) 87 return ERR_PTR(ret); 88 89 /* Decode the AuthorityKeyIdentifier */ 90 if (ctx->raw_akid) { 91 pr_devel("AKID: %u %*phN\n", 92 ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid); 93 ret = asn1_ber_decoder(&x509_akid_decoder, ctx, 94 ctx->raw_akid, ctx->raw_akid_size); 95 if (ret < 0) { 96 pr_warn("Couldn't decode AuthKeyIdentifier\n"); 97 return ERR_PTR(ret); 98 } 99 } 100 101 cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL); 102 if (!cert->pub->key) 103 return ERR_PTR(-ENOMEM); 104 105 cert->pub->keylen = ctx->key_size; 106 107 cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL); 108 if (!cert->pub->params) 109 return ERR_PTR(-ENOMEM); 110 111 cert->pub->paramlen = ctx->params_size; 112 cert->pub->algo = ctx->key_algo; 113 114 /* Grab the signature bits */ 115 ret = x509_get_sig_params(cert); 116 if (ret < 0) 117 return ERR_PTR(ret); 118 119 /* Generate cert issuer + serial number key ID */ 120 kid = asymmetric_key_generate_id(cert->raw_serial, 121 cert->raw_serial_size, 122 cert->raw_issuer, 123 cert->raw_issuer_size); 124 if (IS_ERR(kid)) 125 return ERR_CAST(kid); 126 cert->id = kid; 127 128 /* Detect self-signed certificates */ 129 ret = x509_check_for_self_signed(cert); 130 if (ret < 0) 131 return ERR_PTR(ret); 132 133 return_ptr(cert); 134 } 135 EXPORT_SYMBOL_GPL(x509_cert_parse); 136 137 /* 138 * Note an OID when we find one for later processing when we know how 139 * to interpret it. 140 */ 141 int x509_note_OID(void *context, size_t hdrlen, 142 unsigned char tag, 143 const void *value, size_t vlen) 144 { 145 struct x509_parse_context *ctx = context; 146 147 ctx->last_oid = look_up_OID(value, vlen); 148 if (ctx->last_oid == OID__NR) { 149 char buffer[50]; 150 sprint_oid(value, vlen, buffer, sizeof(buffer)); 151 pr_debug("Unknown OID: [%lu] %s\n", 152 (unsigned long)value - ctx->data, buffer); 153 } 154 return 0; 155 } 156 157 /* 158 * Save the position of the TBS data so that we can check the signature over it 159 * later. 160 */ 161 int x509_note_tbs_certificate(void *context, size_t hdrlen, 162 unsigned char tag, 163 const void *value, size_t vlen) 164 { 165 struct x509_parse_context *ctx = context; 166 167 pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n", 168 hdrlen, tag, (unsigned long)value - ctx->data, vlen); 169 170 ctx->cert->tbs = value - hdrlen; 171 ctx->cert->tbs_size = vlen + hdrlen; 172 return 0; 173 } 174 175 /* 176 * Record the algorithm that was used to sign this certificate. 177 */ 178 int x509_note_sig_algo(void *context, size_t hdrlen, unsigned char tag, 179 const void *value, size_t vlen) 180 { 181 struct x509_parse_context *ctx = context; 182 183 pr_debug("PubKey Algo: %u\n", ctx->last_oid); 184 185 switch (ctx->last_oid) { 186 default: 187 return -ENOPKG; /* Unsupported combination */ 188 189 case OID_sha1WithRSAEncryption: 190 ctx->cert->sig->hash_algo = "sha1"; 191 goto rsa_pkcs1; 192 193 case OID_sha256WithRSAEncryption: 194 ctx->cert->sig->hash_algo = "sha256"; 195 goto rsa_pkcs1; 196 197 case OID_sha384WithRSAEncryption: 198 ctx->cert->sig->hash_algo = "sha384"; 199 goto rsa_pkcs1; 200 201 case OID_sha512WithRSAEncryption: 202 ctx->cert->sig->hash_algo = "sha512"; 203 goto rsa_pkcs1; 204 205 case OID_sha224WithRSAEncryption: 206 ctx->cert->sig->hash_algo = "sha224"; 207 goto rsa_pkcs1; 208 209 case OID_id_ecdsa_with_sha1: 210 ctx->cert->sig->hash_algo = "sha1"; 211 goto ecdsa; 212 213 case OID_id_rsassa_pkcs1_v1_5_with_sha3_256: 214 ctx->cert->sig->hash_algo = "sha3-256"; 215 goto rsa_pkcs1; 216 217 case OID_id_rsassa_pkcs1_v1_5_with_sha3_384: 218 ctx->cert->sig->hash_algo = "sha3-384"; 219 goto rsa_pkcs1; 220 221 case OID_id_rsassa_pkcs1_v1_5_with_sha3_512: 222 ctx->cert->sig->hash_algo = "sha3-512"; 223 goto rsa_pkcs1; 224 225 case OID_id_ecdsa_with_sha224: 226 ctx->cert->sig->hash_algo = "sha224"; 227 goto ecdsa; 228 229 case OID_id_ecdsa_with_sha256: 230 ctx->cert->sig->hash_algo = "sha256"; 231 goto ecdsa; 232 233 case OID_id_ecdsa_with_sha384: 234 ctx->cert->sig->hash_algo = "sha384"; 235 goto ecdsa; 236 237 case OID_id_ecdsa_with_sha512: 238 ctx->cert->sig->hash_algo = "sha512"; 239 goto ecdsa; 240 241 case OID_id_ecdsa_with_sha3_256: 242 ctx->cert->sig->hash_algo = "sha3-256"; 243 goto ecdsa; 244 245 case OID_id_ecdsa_with_sha3_384: 246 ctx->cert->sig->hash_algo = "sha3-384"; 247 goto ecdsa; 248 249 case OID_id_ecdsa_with_sha3_512: 250 ctx->cert->sig->hash_algo = "sha3-512"; 251 goto ecdsa; 252 253 case OID_gost2012Signature256: 254 ctx->cert->sig->hash_algo = "streebog256"; 255 goto ecrdsa; 256 257 case OID_gost2012Signature512: 258 ctx->cert->sig->hash_algo = "streebog512"; 259 goto ecrdsa; 260 } 261 262 rsa_pkcs1: 263 ctx->cert->sig->pkey_algo = "rsa"; 264 ctx->cert->sig->encoding = "pkcs1"; 265 ctx->sig_algo = ctx->last_oid; 266 return 0; 267 ecrdsa: 268 ctx->cert->sig->pkey_algo = "ecrdsa"; 269 ctx->cert->sig->encoding = "raw"; 270 ctx->sig_algo = ctx->last_oid; 271 return 0; 272 ecdsa: 273 ctx->cert->sig->pkey_algo = "ecdsa"; 274 ctx->cert->sig->encoding = "x962"; 275 ctx->sig_algo = ctx->last_oid; 276 return 0; 277 } 278 279 /* 280 * Note the whereabouts and type of the signature. 281 */ 282 int x509_note_signature(void *context, size_t hdrlen, 283 unsigned char tag, 284 const void *value, size_t vlen) 285 { 286 struct x509_parse_context *ctx = context; 287 288 pr_debug("Signature: alg=%u, size=%zu\n", ctx->last_oid, vlen); 289 290 /* 291 * In X.509 certificates, the signature's algorithm is stored in two 292 * places: inside the TBSCertificate (the data that is signed), and 293 * alongside the signature. These *must* match. 294 */ 295 if (ctx->last_oid != ctx->sig_algo) { 296 pr_warn("signatureAlgorithm (%u) differs from tbsCertificate.signature (%u)\n", 297 ctx->last_oid, ctx->sig_algo); 298 return -EINVAL; 299 } 300 301 if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 || 302 strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0 || 303 strcmp(ctx->cert->sig->pkey_algo, "ecdsa") == 0) { 304 /* Discard the BIT STRING metadata */ 305 if (vlen < 1 || *(const u8 *)value != 0) 306 return -EBADMSG; 307 308 value++; 309 vlen--; 310 } 311 312 ctx->cert->raw_sig = value; 313 ctx->cert->raw_sig_size = vlen; 314 return 0; 315 } 316 317 /* 318 * Note the certificate serial number 319 */ 320 int x509_note_serial(void *context, size_t hdrlen, 321 unsigned char tag, 322 const void *value, size_t vlen) 323 { 324 struct x509_parse_context *ctx = context; 325 ctx->cert->raw_serial = value; 326 ctx->cert->raw_serial_size = vlen; 327 return 0; 328 } 329 330 /* 331 * Note some of the name segments from which we'll fabricate a name. 332 */ 333 int x509_extract_name_segment(void *context, size_t hdrlen, 334 unsigned char tag, 335 const void *value, size_t vlen) 336 { 337 struct x509_parse_context *ctx = context; 338 339 switch (ctx->last_oid) { 340 case OID_commonName: 341 ctx->cn_size = vlen; 342 ctx->cn_offset = (unsigned long)value - ctx->data; 343 break; 344 case OID_organizationName: 345 ctx->o_size = vlen; 346 ctx->o_offset = (unsigned long)value - ctx->data; 347 break; 348 case OID_email_address: 349 ctx->email_size = vlen; 350 ctx->email_offset = (unsigned long)value - ctx->data; 351 break; 352 default: 353 break; 354 } 355 356 return 0; 357 } 358 359 /* 360 * Fabricate and save the issuer and subject names 361 */ 362 static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen, 363 unsigned char tag, 364 char **_name, size_t vlen) 365 { 366 const void *name, *data = (const void *)ctx->data; 367 size_t namesize; 368 char *buffer; 369 370 if (*_name) 371 return -EINVAL; 372 373 /* Empty name string if no material */ 374 if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) { 375 buffer = kzalloc(1, GFP_KERNEL); 376 if (!buffer) 377 return -ENOMEM; 378 goto done; 379 } 380 381 if (ctx->cn_size && ctx->o_size) { 382 /* Consider combining O and CN, but use only the CN if it is 383 * prefixed by the O, or a significant portion thereof. 384 */ 385 namesize = ctx->cn_size; 386 name = data + ctx->cn_offset; 387 if (ctx->cn_size >= ctx->o_size && 388 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 389 ctx->o_size) == 0) 390 goto single_component; 391 if (ctx->cn_size >= 7 && 392 ctx->o_size >= 7 && 393 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0) 394 goto single_component; 395 396 buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1, 397 GFP_KERNEL); 398 if (!buffer) 399 return -ENOMEM; 400 401 memcpy(buffer, 402 data + ctx->o_offset, ctx->o_size); 403 buffer[ctx->o_size + 0] = ':'; 404 buffer[ctx->o_size + 1] = ' '; 405 memcpy(buffer + ctx->o_size + 2, 406 data + ctx->cn_offset, ctx->cn_size); 407 buffer[ctx->o_size + 2 + ctx->cn_size] = 0; 408 goto done; 409 410 } else if (ctx->cn_size) { 411 namesize = ctx->cn_size; 412 name = data + ctx->cn_offset; 413 } else if (ctx->o_size) { 414 namesize = ctx->o_size; 415 name = data + ctx->o_offset; 416 } else { 417 namesize = ctx->email_size; 418 name = data + ctx->email_offset; 419 } 420 421 single_component: 422 buffer = kmalloc(namesize + 1, GFP_KERNEL); 423 if (!buffer) 424 return -ENOMEM; 425 memcpy(buffer, name, namesize); 426 buffer[namesize] = 0; 427 428 done: 429 *_name = buffer; 430 ctx->cn_size = 0; 431 ctx->o_size = 0; 432 ctx->email_size = 0; 433 return 0; 434 } 435 436 int x509_note_issuer(void *context, size_t hdrlen, 437 unsigned char tag, 438 const void *value, size_t vlen) 439 { 440 struct x509_parse_context *ctx = context; 441 struct asymmetric_key_id *kid; 442 443 ctx->cert->raw_issuer = value; 444 ctx->cert->raw_issuer_size = vlen; 445 446 if (!ctx->cert->sig->auth_ids[2]) { 447 kid = asymmetric_key_generate_id(value, vlen, "", 0); 448 if (IS_ERR(kid)) 449 return PTR_ERR(kid); 450 ctx->cert->sig->auth_ids[2] = kid; 451 } 452 453 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen); 454 } 455 456 int x509_note_subject(void *context, size_t hdrlen, 457 unsigned char tag, 458 const void *value, size_t vlen) 459 { 460 struct x509_parse_context *ctx = context; 461 ctx->cert->raw_subject = value; 462 ctx->cert->raw_subject_size = vlen; 463 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen); 464 } 465 466 /* 467 * Extract the parameters for the public key 468 */ 469 int x509_note_params(void *context, size_t hdrlen, 470 unsigned char tag, 471 const void *value, size_t vlen) 472 { 473 struct x509_parse_context *ctx = context; 474 475 /* 476 * AlgorithmIdentifier is used three times in the x509, we should skip 477 * first and ignore third, using second one which is after subject and 478 * before subjectPublicKey. 479 */ 480 if (!ctx->cert->raw_subject || ctx->key) 481 return 0; 482 ctx->params = value - hdrlen; 483 ctx->params_size = vlen + hdrlen; 484 return 0; 485 } 486 487 /* 488 * Extract the data for the public key algorithm 489 */ 490 int x509_extract_key_data(void *context, size_t hdrlen, 491 unsigned char tag, 492 const void *value, size_t vlen) 493 { 494 struct x509_parse_context *ctx = context; 495 enum OID oid; 496 497 ctx->key_algo = ctx->last_oid; 498 switch (ctx->last_oid) { 499 case OID_rsaEncryption: 500 ctx->cert->pub->pkey_algo = "rsa"; 501 break; 502 case OID_gost2012PKey256: 503 case OID_gost2012PKey512: 504 ctx->cert->pub->pkey_algo = "ecrdsa"; 505 break; 506 case OID_id_ecPublicKey: 507 if (parse_OID(ctx->params, ctx->params_size, &oid) != 0) 508 return -EBADMSG; 509 510 switch (oid) { 511 case OID_id_prime192v1: 512 ctx->cert->pub->pkey_algo = "ecdsa-nist-p192"; 513 break; 514 case OID_id_prime256v1: 515 ctx->cert->pub->pkey_algo = "ecdsa-nist-p256"; 516 break; 517 case OID_id_ansip384r1: 518 ctx->cert->pub->pkey_algo = "ecdsa-nist-p384"; 519 break; 520 case OID_id_ansip521r1: 521 ctx->cert->pub->pkey_algo = "ecdsa-nist-p521"; 522 break; 523 default: 524 return -ENOPKG; 525 } 526 break; 527 default: 528 return -ENOPKG; 529 } 530 531 /* Discard the BIT STRING metadata */ 532 if (vlen < 1 || *(const u8 *)value != 0) 533 return -EBADMSG; 534 ctx->key = value + 1; 535 ctx->key_size = vlen - 1; 536 return 0; 537 } 538 539 /* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */ 540 #define SEQ_TAG_KEYID (ASN1_CONT << 6) 541 542 /* 543 * Process certificate extensions that are used to qualify the certificate. 544 */ 545 int x509_process_extension(void *context, size_t hdrlen, 546 unsigned char tag, 547 const void *value, size_t vlen) 548 { 549 struct x509_parse_context *ctx = context; 550 struct asymmetric_key_id *kid; 551 const unsigned char *v = value; 552 553 pr_debug("Extension: %u\n", ctx->last_oid); 554 555 if (ctx->last_oid == OID_subjectKeyIdentifier) { 556 /* Get hold of the key fingerprint */ 557 if (ctx->cert->skid || vlen < 3) 558 return -EBADMSG; 559 if (v[0] != ASN1_OTS || v[1] != vlen - 2) 560 return -EBADMSG; 561 v += 2; 562 vlen -= 2; 563 564 ctx->cert->raw_skid_size = vlen; 565 ctx->cert->raw_skid = v; 566 kid = asymmetric_key_generate_id(v, vlen, "", 0); 567 if (IS_ERR(kid)) 568 return PTR_ERR(kid); 569 ctx->cert->skid = kid; 570 pr_debug("subjkeyid %*phN\n", kid->len, kid->data); 571 return 0; 572 } 573 574 if (ctx->last_oid == OID_keyUsage) { 575 /* 576 * Get hold of the keyUsage bit string 577 * v[1] is the encoding size 578 * (Expect either 0x02 or 0x03, making it 1 or 2 bytes) 579 * v[2] is the number of unused bits in the bit string 580 * (If >= 3 keyCertSign is missing when v[1] = 0x02) 581 * v[3] and possibly v[4] contain the bit string 582 * 583 * From RFC 5280 4.2.1.3: 584 * 0x04 is where keyCertSign lands in this bit string 585 * 0x80 is where digitalSignature lands in this bit string 586 */ 587 if (v[0] != ASN1_BTS) 588 return -EBADMSG; 589 if (vlen < 4) 590 return -EBADMSG; 591 if (v[2] >= 8) 592 return -EBADMSG; 593 if (v[3] & 0x80) 594 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_DIGITALSIG; 595 if (v[1] == 0x02 && v[2] <= 2 && (v[3] & 0x04)) 596 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_KEYCERTSIGN; 597 else if (vlen > 4 && v[1] == 0x03 && (v[3] & 0x04)) 598 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_KEYCERTSIGN; 599 return 0; 600 } 601 602 if (ctx->last_oid == OID_authorityKeyIdentifier) { 603 /* Get hold of the CA key fingerprint */ 604 ctx->raw_akid = v; 605 ctx->raw_akid_size = vlen; 606 return 0; 607 } 608 609 if (ctx->last_oid == OID_basicConstraints) { 610 /* 611 * Get hold of the basicConstraints 612 * v[1] is the encoding size 613 * (Expect 0x2 or greater, making it 1 or more bytes) 614 * v[2] is the encoding type 615 * (Expect an ASN1_BOOL for the CA) 616 * v[3] is the contents of the ASN1_BOOL 617 * (Expect 1 if the CA is TRUE) 618 * vlen should match the entire extension size 619 */ 620 if (v[0] != (ASN1_CONS_BIT | ASN1_SEQ)) 621 return -EBADMSG; 622 if (vlen < 2) 623 return -EBADMSG; 624 if (v[1] != vlen - 2) 625 return -EBADMSG; 626 if (vlen >= 4 && v[1] != 0 && v[2] == ASN1_BOOL && v[3] == 1) 627 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_CA; 628 return 0; 629 } 630 631 return 0; 632 } 633 634 /** 635 * x509_decode_time - Decode an X.509 time ASN.1 object 636 * @_t: The time to fill in 637 * @hdrlen: The length of the object header 638 * @tag: The object tag 639 * @value: The object value 640 * @vlen: The size of the object value 641 * 642 * Decode an ASN.1 universal time or generalised time field into a struct the 643 * kernel can handle and check it for validity. The time is decoded thus: 644 * 645 * [RFC5280 §4.1.2.5] 646 * CAs conforming to this profile MUST always encode certificate validity 647 * dates through the year 2049 as UTCTime; certificate validity dates in 648 * 2050 or later MUST be encoded as GeneralizedTime. Conforming 649 * applications MUST be able to process validity dates that are encoded in 650 * either UTCTime or GeneralizedTime. 651 */ 652 int x509_decode_time(time64_t *_t, size_t hdrlen, 653 unsigned char tag, 654 const unsigned char *value, size_t vlen) 655 { 656 static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30, 657 31, 31, 30, 31, 30, 31 }; 658 const unsigned char *p = value; 659 unsigned year, mon, day, hour, min, sec, mon_len; 660 661 #define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; }) 662 #define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; }) 663 664 if (tag == ASN1_UNITIM) { 665 /* UTCTime: YYMMDDHHMMSSZ */ 666 if (vlen != 13) 667 goto unsupported_time; 668 year = DD2bin(p); 669 if (year >= 50) 670 year += 1900; 671 else 672 year += 2000; 673 } else if (tag == ASN1_GENTIM) { 674 /* GenTime: YYYYMMDDHHMMSSZ */ 675 if (vlen != 15) 676 goto unsupported_time; 677 year = DD2bin(p) * 100 + DD2bin(p); 678 if (year >= 1950 && year <= 2049) 679 goto invalid_time; 680 } else { 681 goto unsupported_time; 682 } 683 684 mon = DD2bin(p); 685 day = DD2bin(p); 686 hour = DD2bin(p); 687 min = DD2bin(p); 688 sec = DD2bin(p); 689 690 if (*p != 'Z') 691 goto unsupported_time; 692 693 if (year < 1970 || 694 mon < 1 || mon > 12) 695 goto invalid_time; 696 697 mon_len = month_lengths[mon - 1]; 698 if (mon == 2) { 699 if (year % 4 == 0) { 700 mon_len = 29; 701 if (year % 100 == 0) { 702 mon_len = 28; 703 if (year % 400 == 0) 704 mon_len = 29; 705 } 706 } 707 } 708 709 if (day < 1 || day > mon_len || 710 hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */ 711 min > 59 || 712 sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */ 713 goto invalid_time; 714 715 *_t = mktime64(year, mon, day, hour, min, sec); 716 return 0; 717 718 unsupported_time: 719 pr_debug("Got unsupported time [tag %02x]: '%*phN'\n", 720 tag, (int)vlen, value); 721 return -EBADMSG; 722 invalid_time: 723 pr_debug("Got invalid time [tag %02x]: '%*phN'\n", 724 tag, (int)vlen, value); 725 return -EBADMSG; 726 } 727 EXPORT_SYMBOL_GPL(x509_decode_time); 728 729 int x509_note_not_before(void *context, size_t hdrlen, 730 unsigned char tag, 731 const void *value, size_t vlen) 732 { 733 struct x509_parse_context *ctx = context; 734 return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen); 735 } 736 737 int x509_note_not_after(void *context, size_t hdrlen, 738 unsigned char tag, 739 const void *value, size_t vlen) 740 { 741 struct x509_parse_context *ctx = context; 742 return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen); 743 } 744 745 /* 746 * Note a key identifier-based AuthorityKeyIdentifier 747 */ 748 int x509_akid_note_kid(void *context, size_t hdrlen, 749 unsigned char tag, 750 const void *value, size_t vlen) 751 { 752 struct x509_parse_context *ctx = context; 753 struct asymmetric_key_id *kid; 754 755 pr_debug("AKID: keyid: %*phN\n", (int)vlen, value); 756 757 if (ctx->cert->sig->auth_ids[1]) 758 return 0; 759 760 kid = asymmetric_key_generate_id(value, vlen, "", 0); 761 if (IS_ERR(kid)) 762 return PTR_ERR(kid); 763 pr_debug("authkeyid %*phN\n", kid->len, kid->data); 764 ctx->cert->sig->auth_ids[1] = kid; 765 return 0; 766 } 767 768 /* 769 * Note a directoryName in an AuthorityKeyIdentifier 770 */ 771 int x509_akid_note_name(void *context, size_t hdrlen, 772 unsigned char tag, 773 const void *value, size_t vlen) 774 { 775 struct x509_parse_context *ctx = context; 776 777 pr_debug("AKID: name: %*phN\n", (int)vlen, value); 778 779 ctx->akid_raw_issuer = value; 780 ctx->akid_raw_issuer_size = vlen; 781 return 0; 782 } 783 784 /* 785 * Note a serial number in an AuthorityKeyIdentifier 786 */ 787 int x509_akid_note_serial(void *context, size_t hdrlen, 788 unsigned char tag, 789 const void *value, size_t vlen) 790 { 791 struct x509_parse_context *ctx = context; 792 struct asymmetric_key_id *kid; 793 794 pr_debug("AKID: serial: %*phN\n", (int)vlen, value); 795 796 if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0]) 797 return 0; 798 799 kid = asymmetric_key_generate_id(value, 800 vlen, 801 ctx->akid_raw_issuer, 802 ctx->akid_raw_issuer_size); 803 if (IS_ERR(kid)) 804 return PTR_ERR(kid); 805 806 pr_debug("authkeyid %*phN\n", kid->len, kid->data); 807 ctx->cert->sig->auth_ids[0] = kid; 808 return 0; 809 } 810