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; 64 struct x509_parse_context *ctx; 65 struct asymmetric_key_id *kid; 66 long ret; 67 68 ret = -ENOMEM; 69 cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL); 70 if (!cert) 71 goto error_no_cert; 72 cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL); 73 if (!cert->pub) 74 goto error_no_ctx; 75 cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL); 76 if (!cert->sig) 77 goto error_no_ctx; 78 ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL); 79 if (!ctx) 80 goto error_no_ctx; 81 82 ctx->cert = cert; 83 ctx->data = (unsigned long)data; 84 85 /* Attempt to decode the certificate */ 86 ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen); 87 if (ret < 0) 88 goto error_decode; 89 90 /* Decode the AuthorityKeyIdentifier */ 91 if (ctx->raw_akid) { 92 pr_devel("AKID: %u %*phN\n", 93 ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid); 94 ret = asn1_ber_decoder(&x509_akid_decoder, ctx, 95 ctx->raw_akid, ctx->raw_akid_size); 96 if (ret < 0) { 97 pr_warn("Couldn't decode AuthKeyIdentifier\n"); 98 goto error_decode; 99 } 100 } 101 102 ret = -ENOMEM; 103 cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL); 104 if (!cert->pub->key) 105 goto error_decode; 106 107 cert->pub->keylen = ctx->key_size; 108 109 cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL); 110 if (!cert->pub->params) 111 goto error_decode; 112 113 cert->pub->paramlen = ctx->params_size; 114 cert->pub->algo = ctx->key_algo; 115 116 /* Grab the signature bits */ 117 ret = x509_get_sig_params(cert); 118 if (ret < 0) 119 goto error_decode; 120 121 /* Generate cert issuer + serial number key ID */ 122 kid = asymmetric_key_generate_id(cert->raw_serial, 123 cert->raw_serial_size, 124 cert->raw_issuer, 125 cert->raw_issuer_size); 126 if (IS_ERR(kid)) { 127 ret = PTR_ERR(kid); 128 goto error_decode; 129 } 130 cert->id = kid; 131 132 /* Detect self-signed certificates */ 133 ret = x509_check_for_self_signed(cert); 134 if (ret < 0) 135 goto error_decode; 136 137 kfree(ctx); 138 return cert; 139 140 error_decode: 141 kfree(ctx); 142 error_no_ctx: 143 x509_free_certificate(cert); 144 error_no_cert: 145 return ERR_PTR(ret); 146 } 147 EXPORT_SYMBOL_GPL(x509_cert_parse); 148 149 /* 150 * Note an OID when we find one for later processing when we know how 151 * to interpret it. 152 */ 153 int x509_note_OID(void *context, size_t hdrlen, 154 unsigned char tag, 155 const void *value, size_t vlen) 156 { 157 struct x509_parse_context *ctx = context; 158 159 ctx->last_oid = look_up_OID(value, vlen); 160 if (ctx->last_oid == OID__NR) { 161 char buffer[50]; 162 sprint_oid(value, vlen, buffer, sizeof(buffer)); 163 pr_debug("Unknown OID: [%lu] %s\n", 164 (unsigned long)value - ctx->data, buffer); 165 } 166 return 0; 167 } 168 169 /* 170 * Save the position of the TBS data so that we can check the signature over it 171 * later. 172 */ 173 int x509_note_tbs_certificate(void *context, size_t hdrlen, 174 unsigned char tag, 175 const void *value, size_t vlen) 176 { 177 struct x509_parse_context *ctx = context; 178 179 pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n", 180 hdrlen, tag, (unsigned long)value - ctx->data, vlen); 181 182 ctx->cert->tbs = value - hdrlen; 183 ctx->cert->tbs_size = vlen + hdrlen; 184 return 0; 185 } 186 187 /* 188 * Record the algorithm that was used to sign this certificate. 189 */ 190 int x509_note_sig_algo(void *context, size_t hdrlen, unsigned char tag, 191 const void *value, size_t vlen) 192 { 193 struct x509_parse_context *ctx = context; 194 195 pr_debug("PubKey Algo: %u\n", ctx->last_oid); 196 197 switch (ctx->last_oid) { 198 default: 199 return -ENOPKG; /* Unsupported combination */ 200 201 case OID_sha256WithRSAEncryption: 202 ctx->cert->sig->hash_algo = "sha256"; 203 goto rsa_pkcs1; 204 205 case OID_sha384WithRSAEncryption: 206 ctx->cert->sig->hash_algo = "sha384"; 207 goto rsa_pkcs1; 208 209 case OID_sha512WithRSAEncryption: 210 ctx->cert->sig->hash_algo = "sha512"; 211 goto rsa_pkcs1; 212 213 case OID_sha224WithRSAEncryption: 214 ctx->cert->sig->hash_algo = "sha224"; 215 goto rsa_pkcs1; 216 217 case OID_id_rsassa_pkcs1_v1_5_with_sha3_256: 218 ctx->cert->sig->hash_algo = "sha3-256"; 219 goto rsa_pkcs1; 220 221 case OID_id_rsassa_pkcs1_v1_5_with_sha3_384: 222 ctx->cert->sig->hash_algo = "sha3-384"; 223 goto rsa_pkcs1; 224 225 case OID_id_rsassa_pkcs1_v1_5_with_sha3_512: 226 ctx->cert->sig->hash_algo = "sha3-512"; 227 goto rsa_pkcs1; 228 229 case OID_id_ecdsa_with_sha224: 230 ctx->cert->sig->hash_algo = "sha224"; 231 goto ecdsa; 232 233 case OID_id_ecdsa_with_sha256: 234 ctx->cert->sig->hash_algo = "sha256"; 235 goto ecdsa; 236 237 case OID_id_ecdsa_with_sha384: 238 ctx->cert->sig->hash_algo = "sha384"; 239 goto ecdsa; 240 241 case OID_id_ecdsa_with_sha512: 242 ctx->cert->sig->hash_algo = "sha512"; 243 goto ecdsa; 244 245 case OID_id_ecdsa_with_sha3_256: 246 ctx->cert->sig->hash_algo = "sha3-256"; 247 goto ecdsa; 248 249 case OID_id_ecdsa_with_sha3_384: 250 ctx->cert->sig->hash_algo = "sha3-384"; 251 goto ecdsa; 252 253 case OID_id_ecdsa_with_sha3_512: 254 ctx->cert->sig->hash_algo = "sha3-512"; 255 goto ecdsa; 256 257 case OID_gost2012Signature256: 258 ctx->cert->sig->hash_algo = "streebog256"; 259 goto ecrdsa; 260 261 case OID_gost2012Signature512: 262 ctx->cert->sig->hash_algo = "streebog512"; 263 goto ecrdsa; 264 265 case OID_SM2_with_SM3: 266 ctx->cert->sig->hash_algo = "sm3"; 267 goto sm2; 268 } 269 270 rsa_pkcs1: 271 ctx->cert->sig->pkey_algo = "rsa"; 272 ctx->cert->sig->encoding = "pkcs1"; 273 ctx->sig_algo = ctx->last_oid; 274 return 0; 275 ecrdsa: 276 ctx->cert->sig->pkey_algo = "ecrdsa"; 277 ctx->cert->sig->encoding = "raw"; 278 ctx->sig_algo = ctx->last_oid; 279 return 0; 280 sm2: 281 ctx->cert->sig->pkey_algo = "sm2"; 282 ctx->cert->sig->encoding = "raw"; 283 ctx->sig_algo = ctx->last_oid; 284 return 0; 285 ecdsa: 286 ctx->cert->sig->pkey_algo = "ecdsa"; 287 ctx->cert->sig->encoding = "x962"; 288 ctx->sig_algo = ctx->last_oid; 289 return 0; 290 } 291 292 /* 293 * Note the whereabouts and type of the signature. 294 */ 295 int x509_note_signature(void *context, size_t hdrlen, 296 unsigned char tag, 297 const void *value, size_t vlen) 298 { 299 struct x509_parse_context *ctx = context; 300 301 pr_debug("Signature: alg=%u, size=%zu\n", ctx->last_oid, vlen); 302 303 /* 304 * In X.509 certificates, the signature's algorithm is stored in two 305 * places: inside the TBSCertificate (the data that is signed), and 306 * alongside the signature. These *must* match. 307 */ 308 if (ctx->last_oid != ctx->sig_algo) { 309 pr_warn("signatureAlgorithm (%u) differs from tbsCertificate.signature (%u)\n", 310 ctx->last_oid, ctx->sig_algo); 311 return -EINVAL; 312 } 313 314 if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 || 315 strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0 || 316 strcmp(ctx->cert->sig->pkey_algo, "sm2") == 0 || 317 strcmp(ctx->cert->sig->pkey_algo, "ecdsa") == 0) { 318 /* Discard the BIT STRING metadata */ 319 if (vlen < 1 || *(const u8 *)value != 0) 320 return -EBADMSG; 321 322 value++; 323 vlen--; 324 } 325 326 ctx->cert->raw_sig = value; 327 ctx->cert->raw_sig_size = vlen; 328 return 0; 329 } 330 331 /* 332 * Note the certificate serial number 333 */ 334 int x509_note_serial(void *context, size_t hdrlen, 335 unsigned char tag, 336 const void *value, size_t vlen) 337 { 338 struct x509_parse_context *ctx = context; 339 ctx->cert->raw_serial = value; 340 ctx->cert->raw_serial_size = vlen; 341 return 0; 342 } 343 344 /* 345 * Note some of the name segments from which we'll fabricate a name. 346 */ 347 int x509_extract_name_segment(void *context, size_t hdrlen, 348 unsigned char tag, 349 const void *value, size_t vlen) 350 { 351 struct x509_parse_context *ctx = context; 352 353 switch (ctx->last_oid) { 354 case OID_commonName: 355 ctx->cn_size = vlen; 356 ctx->cn_offset = (unsigned long)value - ctx->data; 357 break; 358 case OID_organizationName: 359 ctx->o_size = vlen; 360 ctx->o_offset = (unsigned long)value - ctx->data; 361 break; 362 case OID_email_address: 363 ctx->email_size = vlen; 364 ctx->email_offset = (unsigned long)value - ctx->data; 365 break; 366 default: 367 break; 368 } 369 370 return 0; 371 } 372 373 /* 374 * Fabricate and save the issuer and subject names 375 */ 376 static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen, 377 unsigned char tag, 378 char **_name, size_t vlen) 379 { 380 const void *name, *data = (const void *)ctx->data; 381 size_t namesize; 382 char *buffer; 383 384 if (*_name) 385 return -EINVAL; 386 387 /* Empty name string if no material */ 388 if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) { 389 buffer = kmalloc(1, GFP_KERNEL); 390 if (!buffer) 391 return -ENOMEM; 392 buffer[0] = 0; 393 goto done; 394 } 395 396 if (ctx->cn_size && ctx->o_size) { 397 /* Consider combining O and CN, but use only the CN if it is 398 * prefixed by the O, or a significant portion thereof. 399 */ 400 namesize = ctx->cn_size; 401 name = data + ctx->cn_offset; 402 if (ctx->cn_size >= ctx->o_size && 403 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 404 ctx->o_size) == 0) 405 goto single_component; 406 if (ctx->cn_size >= 7 && 407 ctx->o_size >= 7 && 408 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0) 409 goto single_component; 410 411 buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1, 412 GFP_KERNEL); 413 if (!buffer) 414 return -ENOMEM; 415 416 memcpy(buffer, 417 data + ctx->o_offset, ctx->o_size); 418 buffer[ctx->o_size + 0] = ':'; 419 buffer[ctx->o_size + 1] = ' '; 420 memcpy(buffer + ctx->o_size + 2, 421 data + ctx->cn_offset, ctx->cn_size); 422 buffer[ctx->o_size + 2 + ctx->cn_size] = 0; 423 goto done; 424 425 } else if (ctx->cn_size) { 426 namesize = ctx->cn_size; 427 name = data + ctx->cn_offset; 428 } else if (ctx->o_size) { 429 namesize = ctx->o_size; 430 name = data + ctx->o_offset; 431 } else { 432 namesize = ctx->email_size; 433 name = data + ctx->email_offset; 434 } 435 436 single_component: 437 buffer = kmalloc(namesize + 1, GFP_KERNEL); 438 if (!buffer) 439 return -ENOMEM; 440 memcpy(buffer, name, namesize); 441 buffer[namesize] = 0; 442 443 done: 444 *_name = buffer; 445 ctx->cn_size = 0; 446 ctx->o_size = 0; 447 ctx->email_size = 0; 448 return 0; 449 } 450 451 int x509_note_issuer(void *context, size_t hdrlen, 452 unsigned char tag, 453 const void *value, size_t vlen) 454 { 455 struct x509_parse_context *ctx = context; 456 struct asymmetric_key_id *kid; 457 458 ctx->cert->raw_issuer = value; 459 ctx->cert->raw_issuer_size = vlen; 460 461 if (!ctx->cert->sig->auth_ids[2]) { 462 kid = asymmetric_key_generate_id(value, vlen, "", 0); 463 if (IS_ERR(kid)) 464 return PTR_ERR(kid); 465 ctx->cert->sig->auth_ids[2] = kid; 466 } 467 468 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen); 469 } 470 471 int x509_note_subject(void *context, size_t hdrlen, 472 unsigned char tag, 473 const void *value, size_t vlen) 474 { 475 struct x509_parse_context *ctx = context; 476 ctx->cert->raw_subject = value; 477 ctx->cert->raw_subject_size = vlen; 478 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen); 479 } 480 481 /* 482 * Extract the parameters for the public key 483 */ 484 int x509_note_params(void *context, size_t hdrlen, 485 unsigned char tag, 486 const void *value, size_t vlen) 487 { 488 struct x509_parse_context *ctx = context; 489 490 /* 491 * AlgorithmIdentifier is used three times in the x509, we should skip 492 * first and ignore third, using second one which is after subject and 493 * before subjectPublicKey. 494 */ 495 if (!ctx->cert->raw_subject || ctx->key) 496 return 0; 497 ctx->params = value - hdrlen; 498 ctx->params_size = vlen + hdrlen; 499 return 0; 500 } 501 502 /* 503 * Extract the data for the public key algorithm 504 */ 505 int x509_extract_key_data(void *context, size_t hdrlen, 506 unsigned char tag, 507 const void *value, size_t vlen) 508 { 509 struct x509_parse_context *ctx = context; 510 enum OID oid; 511 512 ctx->key_algo = ctx->last_oid; 513 switch (ctx->last_oid) { 514 case OID_rsaEncryption: 515 ctx->cert->pub->pkey_algo = "rsa"; 516 break; 517 case OID_gost2012PKey256: 518 case OID_gost2012PKey512: 519 ctx->cert->pub->pkey_algo = "ecrdsa"; 520 break; 521 case OID_sm2: 522 ctx->cert->pub->pkey_algo = "sm2"; 523 break; 524 case OID_id_ecPublicKey: 525 if (parse_OID(ctx->params, ctx->params_size, &oid) != 0) 526 return -EBADMSG; 527 528 switch (oid) { 529 case OID_sm2: 530 ctx->cert->pub->pkey_algo = "sm2"; 531 break; 532 case OID_id_prime192v1: 533 ctx->cert->pub->pkey_algo = "ecdsa-nist-p192"; 534 break; 535 case OID_id_prime256v1: 536 ctx->cert->pub->pkey_algo = "ecdsa-nist-p256"; 537 break; 538 case OID_id_ansip384r1: 539 ctx->cert->pub->pkey_algo = "ecdsa-nist-p384"; 540 break; 541 default: 542 return -ENOPKG; 543 } 544 break; 545 default: 546 return -ENOPKG; 547 } 548 549 /* Discard the BIT STRING metadata */ 550 if (vlen < 1 || *(const u8 *)value != 0) 551 return -EBADMSG; 552 ctx->key = value + 1; 553 ctx->key_size = vlen - 1; 554 return 0; 555 } 556 557 /* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */ 558 #define SEQ_TAG_KEYID (ASN1_CONT << 6) 559 560 /* 561 * Process certificate extensions that are used to qualify the certificate. 562 */ 563 int x509_process_extension(void *context, size_t hdrlen, 564 unsigned char tag, 565 const void *value, size_t vlen) 566 { 567 struct x509_parse_context *ctx = context; 568 struct asymmetric_key_id *kid; 569 const unsigned char *v = value; 570 571 pr_debug("Extension: %u\n", ctx->last_oid); 572 573 if (ctx->last_oid == OID_subjectKeyIdentifier) { 574 /* Get hold of the key fingerprint */ 575 if (ctx->cert->skid || vlen < 3) 576 return -EBADMSG; 577 if (v[0] != ASN1_OTS || v[1] != vlen - 2) 578 return -EBADMSG; 579 v += 2; 580 vlen -= 2; 581 582 ctx->cert->raw_skid_size = vlen; 583 ctx->cert->raw_skid = v; 584 kid = asymmetric_key_generate_id(v, vlen, "", 0); 585 if (IS_ERR(kid)) 586 return PTR_ERR(kid); 587 ctx->cert->skid = kid; 588 pr_debug("subjkeyid %*phN\n", kid->len, kid->data); 589 return 0; 590 } 591 592 if (ctx->last_oid == OID_keyUsage) { 593 /* 594 * Get hold of the keyUsage bit string 595 * v[1] is the encoding size 596 * (Expect either 0x02 or 0x03, making it 1 or 2 bytes) 597 * v[2] is the number of unused bits in the bit string 598 * (If >= 3 keyCertSign is missing when v[1] = 0x02) 599 * v[3] and possibly v[4] contain the bit string 600 * 601 * From RFC 5280 4.2.1.3: 602 * 0x04 is where keyCertSign lands in this bit string 603 * 0x80 is where digitalSignature lands in this bit string 604 */ 605 if (v[0] != ASN1_BTS) 606 return -EBADMSG; 607 if (vlen < 4) 608 return -EBADMSG; 609 if (v[2] >= 8) 610 return -EBADMSG; 611 if (v[3] & 0x80) 612 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_DIGITALSIG; 613 if (v[1] == 0x02 && v[2] <= 2 && (v[3] & 0x04)) 614 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_KEYCERTSIGN; 615 else if (vlen > 4 && v[1] == 0x03 && (v[3] & 0x04)) 616 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_KEYCERTSIGN; 617 return 0; 618 } 619 620 if (ctx->last_oid == OID_authorityKeyIdentifier) { 621 /* Get hold of the CA key fingerprint */ 622 ctx->raw_akid = v; 623 ctx->raw_akid_size = vlen; 624 return 0; 625 } 626 627 if (ctx->last_oid == OID_basicConstraints) { 628 /* 629 * Get hold of the basicConstraints 630 * v[1] is the encoding size 631 * (Expect 0x2 or greater, making it 1 or more bytes) 632 * v[2] is the encoding type 633 * (Expect an ASN1_BOOL for the CA) 634 * v[3] is the contents of the ASN1_BOOL 635 * (Expect 1 if the CA is TRUE) 636 * vlen should match the entire extension size 637 */ 638 if (v[0] != (ASN1_CONS_BIT | ASN1_SEQ)) 639 return -EBADMSG; 640 if (vlen < 2) 641 return -EBADMSG; 642 if (v[1] != vlen - 2) 643 return -EBADMSG; 644 if (vlen >= 4 && v[1] != 0 && v[2] == ASN1_BOOL && v[3] == 1) 645 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_CA; 646 return 0; 647 } 648 649 return 0; 650 } 651 652 /** 653 * x509_decode_time - Decode an X.509 time ASN.1 object 654 * @_t: The time to fill in 655 * @hdrlen: The length of the object header 656 * @tag: The object tag 657 * @value: The object value 658 * @vlen: The size of the object value 659 * 660 * Decode an ASN.1 universal time or generalised time field into a struct the 661 * kernel can handle and check it for validity. The time is decoded thus: 662 * 663 * [RFC5280 §4.1.2.5] 664 * CAs conforming to this profile MUST always encode certificate validity 665 * dates through the year 2049 as UTCTime; certificate validity dates in 666 * 2050 or later MUST be encoded as GeneralizedTime. Conforming 667 * applications MUST be able to process validity dates that are encoded in 668 * either UTCTime or GeneralizedTime. 669 */ 670 int x509_decode_time(time64_t *_t, size_t hdrlen, 671 unsigned char tag, 672 const unsigned char *value, size_t vlen) 673 { 674 static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30, 675 31, 31, 30, 31, 30, 31 }; 676 const unsigned char *p = value; 677 unsigned year, mon, day, hour, min, sec, mon_len; 678 679 #define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; }) 680 #define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; }) 681 682 if (tag == ASN1_UNITIM) { 683 /* UTCTime: YYMMDDHHMMSSZ */ 684 if (vlen != 13) 685 goto unsupported_time; 686 year = DD2bin(p); 687 if (year >= 50) 688 year += 1900; 689 else 690 year += 2000; 691 } else if (tag == ASN1_GENTIM) { 692 /* GenTime: YYYYMMDDHHMMSSZ */ 693 if (vlen != 15) 694 goto unsupported_time; 695 year = DD2bin(p) * 100 + DD2bin(p); 696 if (year >= 1950 && year <= 2049) 697 goto invalid_time; 698 } else { 699 goto unsupported_time; 700 } 701 702 mon = DD2bin(p); 703 day = DD2bin(p); 704 hour = DD2bin(p); 705 min = DD2bin(p); 706 sec = DD2bin(p); 707 708 if (*p != 'Z') 709 goto unsupported_time; 710 711 if (year < 1970 || 712 mon < 1 || mon > 12) 713 goto invalid_time; 714 715 mon_len = month_lengths[mon - 1]; 716 if (mon == 2) { 717 if (year % 4 == 0) { 718 mon_len = 29; 719 if (year % 100 == 0) { 720 mon_len = 28; 721 if (year % 400 == 0) 722 mon_len = 29; 723 } 724 } 725 } 726 727 if (day < 1 || day > mon_len || 728 hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */ 729 min > 59 || 730 sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */ 731 goto invalid_time; 732 733 *_t = mktime64(year, mon, day, hour, min, sec); 734 return 0; 735 736 unsupported_time: 737 pr_debug("Got unsupported time [tag %02x]: '%*phN'\n", 738 tag, (int)vlen, value); 739 return -EBADMSG; 740 invalid_time: 741 pr_debug("Got invalid time [tag %02x]: '%*phN'\n", 742 tag, (int)vlen, value); 743 return -EBADMSG; 744 } 745 EXPORT_SYMBOL_GPL(x509_decode_time); 746 747 int x509_note_not_before(void *context, size_t hdrlen, 748 unsigned char tag, 749 const void *value, size_t vlen) 750 { 751 struct x509_parse_context *ctx = context; 752 return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen); 753 } 754 755 int x509_note_not_after(void *context, size_t hdrlen, 756 unsigned char tag, 757 const void *value, size_t vlen) 758 { 759 struct x509_parse_context *ctx = context; 760 return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen); 761 } 762 763 /* 764 * Note a key identifier-based AuthorityKeyIdentifier 765 */ 766 int x509_akid_note_kid(void *context, size_t hdrlen, 767 unsigned char tag, 768 const void *value, size_t vlen) 769 { 770 struct x509_parse_context *ctx = context; 771 struct asymmetric_key_id *kid; 772 773 pr_debug("AKID: keyid: %*phN\n", (int)vlen, value); 774 775 if (ctx->cert->sig->auth_ids[1]) 776 return 0; 777 778 kid = asymmetric_key_generate_id(value, vlen, "", 0); 779 if (IS_ERR(kid)) 780 return PTR_ERR(kid); 781 pr_debug("authkeyid %*phN\n", kid->len, kid->data); 782 ctx->cert->sig->auth_ids[1] = kid; 783 return 0; 784 } 785 786 /* 787 * Note a directoryName in an AuthorityKeyIdentifier 788 */ 789 int x509_akid_note_name(void *context, size_t hdrlen, 790 unsigned char tag, 791 const void *value, size_t vlen) 792 { 793 struct x509_parse_context *ctx = context; 794 795 pr_debug("AKID: name: %*phN\n", (int)vlen, value); 796 797 ctx->akid_raw_issuer = value; 798 ctx->akid_raw_issuer_size = vlen; 799 return 0; 800 } 801 802 /* 803 * Note a serial number in an AuthorityKeyIdentifier 804 */ 805 int x509_akid_note_serial(void *context, size_t hdrlen, 806 unsigned char tag, 807 const void *value, size_t vlen) 808 { 809 struct x509_parse_context *ctx = context; 810 struct asymmetric_key_id *kid; 811 812 pr_debug("AKID: serial: %*phN\n", (int)vlen, value); 813 814 if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0]) 815 return 0; 816 817 kid = asymmetric_key_generate_id(value, 818 vlen, 819 ctx->akid_raw_issuer, 820 ctx->akid_raw_issuer_size); 821 if (IS_ERR(kid)) 822 return PTR_ERR(kid); 823 824 pr_debug("authkeyid %*phN\n", kid->len, kid->data); 825 ctx->cert->sig->auth_ids[0] = kid; 826 return 0; 827 } 828