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 19struct x509_parse_context { 20 struct x509_certificate *cert; /* Certificate being constructed */ 21 unsigned long data; /* Start of data */ 22 const void *cert_start; /* Start of cert content */ 23 const void *key; /* Key data */ 24 size_t key_size; /* Size of key data */ 25 const void *params; /* Key parameters */ 26 size_t params_size; /* Size of key parameters */ 27 enum OID key_algo; /* Public key algorithm */ 28 enum OID last_oid; /* Last OID encountered */ 29 enum OID algo_oid; /* Algorithm OID */ 30 unsigned char nr_mpi; /* Number of MPIs stored */ 31 u8 o_size; /* Size of organizationName (O) */ 32 u8 cn_size; /* Size of commonName (CN) */ 33 u8 email_size; /* Size of emailAddress */ 34 u16 o_offset; /* Offset of organizationName (O) */ 35 u16 cn_offset; /* Offset of commonName (CN) */ 36 u16 email_offset; /* Offset of emailAddress */ 37 unsigned raw_akid_size; 38 const void *raw_akid; /* Raw authorityKeyId in ASN.1 */ 39 const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */ 40 unsigned akid_raw_issuer_size; 41}; 42 43/* 44 * Free an X.509 certificate 45 */ 46void x509_free_certificate(struct x509_certificate *cert) 47{ 48 if (cert) { 49 public_key_free(cert->pub); 50 public_key_signature_free(cert->sig); 51 kfree(cert->issuer); 52 kfree(cert->subject); 53 kfree(cert->id); 54 kfree(cert->skid); 55 kfree(cert); 56 } 57} 58EXPORT_SYMBOL_GPL(x509_free_certificate); 59 60/* 61 * Parse an X.509 certificate 62 */ 63struct x509_certificate *x509_cert_parse(const void *data, size_t datalen) 64{ 65 struct x509_certificate *cert; 66 struct x509_parse_context *ctx; 67 struct asymmetric_key_id *kid; 68 long ret; 69 70 ret = -ENOMEM; 71 cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL); 72 if (!cert) 73 goto error_no_cert; 74 cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL); 75 if (!cert->pub) 76 goto error_no_ctx; 77 cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL); 78 if (!cert->sig) 79 goto error_no_ctx; 80 ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL); 81 if (!ctx) 82 goto error_no_ctx; 83 84 ctx->cert = cert; 85 ctx->data = (unsigned long)data; 86 87 /* Attempt to decode the certificate */ 88 ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen); 89 if (ret < 0) 90 goto error_decode; 91 92 /* Decode the AuthorityKeyIdentifier */ 93 if (ctx->raw_akid) { 94 pr_devel("AKID: %u %*phN\n", 95 ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid); 96 ret = asn1_ber_decoder(&x509_akid_decoder, ctx, 97 ctx->raw_akid, ctx->raw_akid_size); 98 if (ret < 0) { 99 pr_warn("Couldn't decode AuthKeyIdentifier\n"); 100 goto error_decode; 101 } 102 } 103 104 ret = -ENOMEM; 105 cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL); 106 if (!cert->pub->key) 107 goto error_decode; 108 109 cert->pub->keylen = ctx->key_size; 110 111 cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL); 112 if (!cert->pub->params) 113 goto error_decode; 114 115 cert->pub->paramlen = ctx->params_size; 116 cert->pub->algo = ctx->key_algo; 117 118 /* Grab the signature bits */ 119 ret = x509_get_sig_params(cert); 120 if (ret < 0) 121 goto error_decode; 122 123 /* Generate cert issuer + serial number key ID */ 124 kid = asymmetric_key_generate_id(cert->raw_serial, 125 cert->raw_serial_size, 126 cert->raw_issuer, 127 cert->raw_issuer_size); 128 if (IS_ERR(kid)) { 129 ret = PTR_ERR(kid); 130 goto error_decode; 131 } 132 cert->id = kid; 133 134 /* Detect self-signed certificates */ 135 ret = x509_check_for_self_signed(cert); 136 if (ret < 0) 137 goto error_decode; 138 139 kfree(ctx); 140 return cert; 141 142error_decode: 143 kfree(ctx); 144error_no_ctx: 145 x509_free_certificate(cert); 146error_no_cert: 147 return ERR_PTR(ret); 148} 149EXPORT_SYMBOL_GPL(x509_cert_parse); 150 151/* 152 * Note an OID when we find one for later processing when we know how 153 * to interpret it. 154 */ 155int x509_note_OID(void *context, size_t hdrlen, 156 unsigned char tag, 157 const void *value, size_t vlen) 158{ 159 struct x509_parse_context *ctx = context; 160 161 ctx->last_oid = look_up_OID(value, vlen); 162 if (ctx->last_oid == OID__NR) { 163 char buffer[50]; 164 sprint_oid(value, vlen, buffer, sizeof(buffer)); 165 pr_debug("Unknown OID: [%lu] %s\n", 166 (unsigned long)value - ctx->data, buffer); 167 } 168 return 0; 169} 170 171/* 172 * Save the position of the TBS data so that we can check the signature over it 173 * later. 174 */ 175int x509_note_tbs_certificate(void *context, size_t hdrlen, 176 unsigned char tag, 177 const void *value, size_t vlen) 178{ 179 struct x509_parse_context *ctx = context; 180 181 pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n", 182 hdrlen, tag, (unsigned long)value - ctx->data, vlen); 183 184 ctx->cert->tbs = value - hdrlen; 185 ctx->cert->tbs_size = vlen + hdrlen; 186 return 0; 187} 188 189/* 190 * Record the public key algorithm 191 */ 192int x509_note_pkey_algo(void *context, size_t hdrlen, 193 unsigned char tag, 194 const void *value, size_t vlen) 195{ 196 struct x509_parse_context *ctx = context; 197 198 pr_debug("PubKey Algo: %u\n", ctx->last_oid); 199 200 switch (ctx->last_oid) { 201 case OID_md2WithRSAEncryption: 202 case OID_md3WithRSAEncryption: 203 default: 204 return -ENOPKG; /* Unsupported combination */ 205 206 case OID_md4WithRSAEncryption: 207 ctx->cert->sig->hash_algo = "md4"; 208 goto rsa_pkcs1; 209 210 case OID_sha1WithRSAEncryption: 211 ctx->cert->sig->hash_algo = "sha1"; 212 goto rsa_pkcs1; 213 214 case OID_sha256WithRSAEncryption: 215 ctx->cert->sig->hash_algo = "sha256"; 216 goto rsa_pkcs1; 217 218 case OID_sha384WithRSAEncryption: 219 ctx->cert->sig->hash_algo = "sha384"; 220 goto rsa_pkcs1; 221 222 case OID_sha512WithRSAEncryption: 223 ctx->cert->sig->hash_algo = "sha512"; 224 goto rsa_pkcs1; 225 226 case OID_sha224WithRSAEncryption: 227 ctx->cert->sig->hash_algo = "sha224"; 228 goto rsa_pkcs1; 229 230 case OID_id_ecdsa_with_sha1: 231 ctx->cert->sig->hash_algo = "sha1"; 232 goto ecdsa; 233 234 case OID_id_ecdsa_with_sha224: 235 ctx->cert->sig->hash_algo = "sha224"; 236 goto ecdsa; 237 238 case OID_id_ecdsa_with_sha256: 239 ctx->cert->sig->hash_algo = "sha256"; 240 goto ecdsa; 241 242 case OID_id_ecdsa_with_sha384: 243 ctx->cert->sig->hash_algo = "sha384"; 244 goto ecdsa; 245 246 case OID_id_ecdsa_with_sha512: 247 ctx->cert->sig->hash_algo = "sha512"; 248 goto ecdsa; 249 250 case OID_gost2012Signature256: 251 ctx->cert->sig->hash_algo = "streebog256"; 252 goto ecrdsa; 253 254 case OID_gost2012Signature512: 255 ctx->cert->sig->hash_algo = "streebog512"; 256 goto ecrdsa; 257 258 case OID_SM2_with_SM3: 259 ctx->cert->sig->hash_algo = "sm3"; 260 goto sm2; 261 } 262 263rsa_pkcs1: 264 ctx->cert->sig->pkey_algo = "rsa"; 265 ctx->cert->sig->encoding = "pkcs1"; 266 ctx->algo_oid = ctx->last_oid; 267 return 0; 268ecrdsa: 269 ctx->cert->sig->pkey_algo = "ecrdsa"; 270 ctx->cert->sig->encoding = "raw"; 271 ctx->algo_oid = ctx->last_oid; 272 return 0; 273sm2: 274 ctx->cert->sig->pkey_algo = "sm2"; 275 ctx->cert->sig->encoding = "raw"; 276 ctx->algo_oid = ctx->last_oid; 277 return 0; 278ecdsa: 279 ctx->cert->sig->pkey_algo = "ecdsa"; 280 ctx->cert->sig->encoding = "x962"; 281 ctx->algo_oid = ctx->last_oid; 282 return 0; 283} 284 285/* 286 * Note the whereabouts and type of the signature. 287 */ 288int x509_note_signature(void *context, size_t hdrlen, 289 unsigned char tag, 290 const void *value, size_t vlen) 291{ 292 struct x509_parse_context *ctx = context; 293 294 pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen); 295 296 if (ctx->last_oid != ctx->algo_oid) { 297 pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n", 298 ctx->algo_oid, ctx->last_oid); 299 return -EINVAL; 300 } 301 302 if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 || 303 strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0 || 304 strcmp(ctx->cert->sig->pkey_algo, "sm2") == 0 || 305 strcmp(ctx->cert->sig->pkey_algo, "ecdsa") == 0) { 306 /* Discard the BIT STRING metadata */ 307 if (vlen < 1 || *(const u8 *)value != 0) 308 return -EBADMSG; 309 310 value++; 311 vlen--; 312 } 313 314 ctx->cert->raw_sig = value; 315 ctx->cert->raw_sig_size = vlen; 316 return 0; 317} 318 319/* 320 * Note the certificate serial number 321 */ 322int x509_note_serial(void *context, size_t hdrlen, 323 unsigned char tag, 324 const void *value, size_t vlen) 325{ 326 struct x509_parse_context *ctx = context; 327 ctx->cert->raw_serial = value; 328 ctx->cert->raw_serial_size = vlen; 329 return 0; 330} 331 332/* 333 * Note some of the name segments from which we'll fabricate a name. 334 */ 335int x509_extract_name_segment(void *context, size_t hdrlen, 336 unsigned char tag, 337 const void *value, size_t vlen) 338{ 339 struct x509_parse_context *ctx = context; 340 341 switch (ctx->last_oid) { 342 case OID_commonName: 343 ctx->cn_size = vlen; 344 ctx->cn_offset = (unsigned long)value - ctx->data; 345 break; 346 case OID_organizationName: 347 ctx->o_size = vlen; 348 ctx->o_offset = (unsigned long)value - ctx->data; 349 break; 350 case OID_email_address: 351 ctx->email_size = vlen; 352 ctx->email_offset = (unsigned long)value - ctx->data; 353 break; 354 default: 355 break; 356 } 357 358 return 0; 359} 360 361/* 362 * Fabricate and save the issuer and subject names 363 */ 364static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen, 365 unsigned char tag, 366 char **_name, size_t vlen) 367{ 368 const void *name, *data = (const void *)ctx->data; 369 size_t namesize; 370 char *buffer; 371 372 if (*_name) 373 return -EINVAL; 374 375 /* Empty name string if no material */ 376 if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) { 377 buffer = kmalloc(1, GFP_KERNEL); 378 if (!buffer) 379 return -ENOMEM; 380 buffer[0] = 0; 381 goto done; 382 } 383 384 if (ctx->cn_size && ctx->o_size) { 385 /* Consider combining O and CN, but use only the CN if it is 386 * prefixed by the O, or a significant portion thereof. 387 */ 388 namesize = ctx->cn_size; 389 name = data + ctx->cn_offset; 390 if (ctx->cn_size >= ctx->o_size && 391 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 392 ctx->o_size) == 0) 393 goto single_component; 394 if (ctx->cn_size >= 7 && 395 ctx->o_size >= 7 && 396 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0) 397 goto single_component; 398 399 buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1, 400 GFP_KERNEL); 401 if (!buffer) 402 return -ENOMEM; 403 404 memcpy(buffer, 405 data + ctx->o_offset, ctx->o_size); 406 buffer[ctx->o_size + 0] = ':'; 407 buffer[ctx->o_size + 1] = ' '; 408 memcpy(buffer + ctx->o_size + 2, 409 data + ctx->cn_offset, ctx->cn_size); 410 buffer[ctx->o_size + 2 + ctx->cn_size] = 0; 411 goto done; 412 413 } else if (ctx->cn_size) { 414 namesize = ctx->cn_size; 415 name = data + ctx->cn_offset; 416 } else if (ctx->o_size) { 417 namesize = ctx->o_size; 418 name = data + ctx->o_offset; 419 } else { 420 namesize = ctx->email_size; 421 name = data + ctx->email_offset; 422 } 423 424single_component: 425 buffer = kmalloc(namesize + 1, GFP_KERNEL); 426 if (!buffer) 427 return -ENOMEM; 428 memcpy(buffer, name, namesize); 429 buffer[namesize] = 0; 430 431done: 432 *_name = buffer; 433 ctx->cn_size = 0; 434 ctx->o_size = 0; 435 ctx->email_size = 0; 436 return 0; 437} 438 439int x509_note_issuer(void *context, size_t hdrlen, 440 unsigned char tag, 441 const void *value, size_t vlen) 442{ 443 struct x509_parse_context *ctx = context; 444 ctx->cert->raw_issuer = value; 445 ctx->cert->raw_issuer_size = vlen; 446 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen); 447} 448 449int x509_note_subject(void *context, size_t hdrlen, 450 unsigned char tag, 451 const void *value, size_t vlen) 452{ 453 struct x509_parse_context *ctx = context; 454 ctx->cert->raw_subject = value; 455 ctx->cert->raw_subject_size = vlen; 456 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen); 457} 458 459/* 460 * Extract the parameters for the public key 461 */ 462int x509_note_params(void *context, size_t hdrlen, 463 unsigned char tag, 464 const void *value, size_t vlen) 465{ 466 struct x509_parse_context *ctx = context; 467 468 /* 469 * AlgorithmIdentifier is used three times in the x509, we should skip 470 * first and ignore third, using second one which is after subject and 471 * before subjectPublicKey. 472 */ 473 if (!ctx->cert->raw_subject || ctx->key) 474 return 0; 475 ctx->params = value - hdrlen; 476 ctx->params_size = vlen + hdrlen; 477 return 0; 478} 479 480/* 481 * Extract the data for the public key algorithm 482 */ 483int x509_extract_key_data(void *context, size_t hdrlen, 484 unsigned char tag, 485 const void *value, size_t vlen) 486{ 487 struct x509_parse_context *ctx = context; 488 enum OID oid; 489 490 ctx->key_algo = ctx->last_oid; 491 switch (ctx->last_oid) { 492 case OID_rsaEncryption: 493 ctx->cert->pub->pkey_algo = "rsa"; 494 break; 495 case OID_gost2012PKey256: 496 case OID_gost2012PKey512: 497 ctx->cert->pub->pkey_algo = "ecrdsa"; 498 break; 499 case OID_id_ecPublicKey: 500 if (parse_OID(ctx->params, ctx->params_size, &oid) != 0) 501 return -EBADMSG; 502 503 switch (oid) { 504 case OID_sm2: 505 ctx->cert->pub->pkey_algo = "sm2"; 506 break; 507 case OID_id_prime192v1: 508 ctx->cert->pub->pkey_algo = "ecdsa-nist-p192"; 509 break; 510 case OID_id_prime256v1: 511 ctx->cert->pub->pkey_algo = "ecdsa-nist-p256"; 512 break; 513 case OID_id_ansip384r1: 514 ctx->cert->pub->pkey_algo = "ecdsa-nist-p384"; 515 break; 516 default: 517 return -ENOPKG; 518 } 519 break; 520 default: 521 return -ENOPKG; 522 } 523 524 /* Discard the BIT STRING metadata */ 525 if (vlen < 1 || *(const u8 *)value != 0) 526 return -EBADMSG; 527 ctx->key = value + 1; 528 ctx->key_size = vlen - 1; 529 return 0; 530} 531 532/* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */ 533#define SEQ_TAG_KEYID (ASN1_CONT << 6) 534 535/* 536 * Process certificate extensions that are used to qualify the certificate. 537 */ 538int x509_process_extension(void *context, size_t hdrlen, 539 unsigned char tag, 540 const void *value, size_t vlen) 541{ 542 struct x509_parse_context *ctx = context; 543 struct asymmetric_key_id *kid; 544 const unsigned char *v = value; 545 546 pr_debug("Extension: %u\n", ctx->last_oid); 547 548 if (ctx->last_oid == OID_subjectKeyIdentifier) { 549 /* Get hold of the key fingerprint */ 550 if (ctx->cert->skid || vlen < 3) 551 return -EBADMSG; 552 if (v[0] != ASN1_OTS || v[1] != vlen - 2) 553 return -EBADMSG; 554 v += 2; 555 vlen -= 2; 556 557 ctx->cert->raw_skid_size = vlen; 558 ctx->cert->raw_skid = v; 559 kid = asymmetric_key_generate_id(v, vlen, "", 0); 560 if (IS_ERR(kid)) 561 return PTR_ERR(kid); 562 ctx->cert->skid = kid; 563 pr_debug("subjkeyid %*phN\n", kid->len, kid->data); 564 return 0; 565 } 566 567 if (ctx->last_oid == OID_authorityKeyIdentifier) { 568 /* Get hold of the CA key fingerprint */ 569 ctx->raw_akid = v; 570 ctx->raw_akid_size = vlen; 571 return 0; 572 } 573 574 return 0; 575} 576 577/** 578 * x509_decode_time - Decode an X.509 time ASN.1 object 579 * @_t: The time to fill in 580 * @hdrlen: The length of the object header 581 * @tag: The object tag 582 * @value: The object value 583 * @vlen: The size of the object value 584 * 585 * Decode an ASN.1 universal time or generalised time field into a struct the 586 * kernel can handle and check it for validity. The time is decoded thus: 587 * 588 * [RFC5280 §4.1.2.5] 589 * CAs conforming to this profile MUST always encode certificate validity 590 * dates through the year 2049 as UTCTime; certificate validity dates in 591 * 2050 or later MUST be encoded as GeneralizedTime. Conforming 592 * applications MUST be able to process validity dates that are encoded in 593 * either UTCTime or GeneralizedTime. 594 */ 595int x509_decode_time(time64_t *_t, size_t hdrlen, 596 unsigned char tag, 597 const unsigned char *value, size_t vlen) 598{ 599 static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30, 600 31, 31, 30, 31, 30, 31 }; 601 const unsigned char *p = value; 602 unsigned year, mon, day, hour, min, sec, mon_len; 603 604#define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; }) 605#define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; }) 606 607 if (tag == ASN1_UNITIM) { 608 /* UTCTime: YYMMDDHHMMSSZ */ 609 if (vlen != 13) 610 goto unsupported_time; 611 year = DD2bin(p); 612 if (year >= 50) 613 year += 1900; 614 else 615 year += 2000; 616 } else if (tag == ASN1_GENTIM) { 617 /* GenTime: YYYYMMDDHHMMSSZ */ 618 if (vlen != 15) 619 goto unsupported_time; 620 year = DD2bin(p) * 100 + DD2bin(p); 621 if (year >= 1950 && year <= 2049) 622 goto invalid_time; 623 } else { 624 goto unsupported_time; 625 } 626 627 mon = DD2bin(p); 628 day = DD2bin(p); 629 hour = DD2bin(p); 630 min = DD2bin(p); 631 sec = DD2bin(p); 632 633 if (*p != 'Z') 634 goto unsupported_time; 635 636 if (year < 1970 || 637 mon < 1 || mon > 12) 638 goto invalid_time; 639 640 mon_len = month_lengths[mon - 1]; 641 if (mon == 2) { 642 if (year % 4 == 0) { 643 mon_len = 29; 644 if (year % 100 == 0) { 645 mon_len = 28; 646 if (year % 400 == 0) 647 mon_len = 29; 648 } 649 } 650 } 651 652 if (day < 1 || day > mon_len || 653 hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */ 654 min > 59 || 655 sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */ 656 goto invalid_time; 657 658 *_t = mktime64(year, mon, day, hour, min, sec); 659 return 0; 660 661unsupported_time: 662 pr_debug("Got unsupported time [tag %02x]: '%*phN'\n", 663 tag, (int)vlen, value); 664 return -EBADMSG; 665invalid_time: 666 pr_debug("Got invalid time [tag %02x]: '%*phN'\n", 667 tag, (int)vlen, value); 668 return -EBADMSG; 669} 670EXPORT_SYMBOL_GPL(x509_decode_time); 671 672int x509_note_not_before(void *context, size_t hdrlen, 673 unsigned char tag, 674 const void *value, size_t vlen) 675{ 676 struct x509_parse_context *ctx = context; 677 return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen); 678} 679 680int x509_note_not_after(void *context, size_t hdrlen, 681 unsigned char tag, 682 const void *value, size_t vlen) 683{ 684 struct x509_parse_context *ctx = context; 685 return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen); 686} 687 688/* 689 * Note a key identifier-based AuthorityKeyIdentifier 690 */ 691int x509_akid_note_kid(void *context, size_t hdrlen, 692 unsigned char tag, 693 const void *value, size_t vlen) 694{ 695 struct x509_parse_context *ctx = context; 696 struct asymmetric_key_id *kid; 697 698 pr_debug("AKID: keyid: %*phN\n", (int)vlen, value); 699 700 if (ctx->cert->sig->auth_ids[1]) 701 return 0; 702 703 kid = asymmetric_key_generate_id(value, vlen, "", 0); 704 if (IS_ERR(kid)) 705 return PTR_ERR(kid); 706 pr_debug("authkeyid %*phN\n", kid->len, kid->data); 707 ctx->cert->sig->auth_ids[1] = kid; 708 return 0; 709} 710 711/* 712 * Note a directoryName in an AuthorityKeyIdentifier 713 */ 714int x509_akid_note_name(void *context, size_t hdrlen, 715 unsigned char tag, 716 const void *value, size_t vlen) 717{ 718 struct x509_parse_context *ctx = context; 719 720 pr_debug("AKID: name: %*phN\n", (int)vlen, value); 721 722 ctx->akid_raw_issuer = value; 723 ctx->akid_raw_issuer_size = vlen; 724 return 0; 725} 726 727/* 728 * Note a serial number in an AuthorityKeyIdentifier 729 */ 730int x509_akid_note_serial(void *context, size_t hdrlen, 731 unsigned char tag, 732 const void *value, size_t vlen) 733{ 734 struct x509_parse_context *ctx = context; 735 struct asymmetric_key_id *kid; 736 737 pr_debug("AKID: serial: %*phN\n", (int)vlen, value); 738 739 if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0]) 740 return 0; 741 742 kid = asymmetric_key_generate_id(value, 743 vlen, 744 ctx->akid_raw_issuer, 745 ctx->akid_raw_issuer_size); 746 if (IS_ERR(kid)) 747 return PTR_ERR(kid); 748 749 pr_debug("authkeyid %*phN\n", kid->len, kid->data); 750 ctx->cert->sig->auth_ids[0] = kid; 751 return 0; 752} 753