1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
|
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 1999.
*/
/* ====================================================================
* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#include <CNIOBoringSSL_pkcs8.h>
#include <limits.h>
#include <CNIOBoringSSL_asn1t.h>
#include <CNIOBoringSSL_asn1.h>
#include <CNIOBoringSSL_bio.h>
#include <CNIOBoringSSL_buf.h>
#include <CNIOBoringSSL_bytestring.h>
#include <CNIOBoringSSL_err.h>
#include <CNIOBoringSSL_evp.h>
#include <CNIOBoringSSL_digest.h>
#include <CNIOBoringSSL_hmac.h>
#include <CNIOBoringSSL_mem.h>
#include <CNIOBoringSSL_rand.h>
#include <CNIOBoringSSL_x509.h>
#include "internal.h"
#include "../bytestring/internal.h"
#include "../internal.h"
int pkcs12_iterations_acceptable(uint64_t iterations) {
#if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
static const uint64_t kIterationsLimit = 2048;
#else
// Windows imposes a limit of 600K. Mozilla say: “so them increasing
// maximum to something like 100M or 1G (to have few decades of breathing
// room) would be very welcome”[1]. So here we set the limit to 100M.
//
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1436873#c14
static const uint64_t kIterationsLimit = 100 * 1000000;
#endif
return 0 < iterations && iterations <= kIterationsLimit;
}
// Minor tweak to operation: zero private key data
static int pkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
void *exarg) {
// Since the structure must still be valid use ASN1_OP_FREE_PRE
if (operation == ASN1_OP_FREE_PRE) {
PKCS8_PRIV_KEY_INFO *key = (PKCS8_PRIV_KEY_INFO *)*pval;
if (key->pkey) {
OPENSSL_cleanse(key->pkey->data, key->pkey->length);
}
}
return 1;
}
ASN1_SEQUENCE_cb(PKCS8_PRIV_KEY_INFO, pkey_cb) = {
ASN1_SIMPLE(PKCS8_PRIV_KEY_INFO, version, ASN1_INTEGER),
ASN1_SIMPLE(PKCS8_PRIV_KEY_INFO, pkeyalg, X509_ALGOR),
ASN1_SIMPLE(PKCS8_PRIV_KEY_INFO, pkey, ASN1_OCTET_STRING),
ASN1_IMP_SET_OF_OPT(PKCS8_PRIV_KEY_INFO, attributes, X509_ATTRIBUTE, 0)
} ASN1_SEQUENCE_END_cb(PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO)
IMPLEMENT_ASN1_FUNCTIONS(PKCS8_PRIV_KEY_INFO)
int PKCS8_pkey_set0(PKCS8_PRIV_KEY_INFO *priv, ASN1_OBJECT *aobj, int version,
int ptype, void *pval, uint8_t *penc, int penclen) {
if (version >= 0 &&
!ASN1_INTEGER_set(priv->version, version)) {
return 0;
}
if (!X509_ALGOR_set0(priv->pkeyalg, aobj, ptype, pval)) {
return 0;
}
if (penc != NULL) {
ASN1_STRING_set0(priv->pkey, penc, penclen);
}
return 1;
}
int PKCS8_pkey_get0(ASN1_OBJECT **ppkalg, const uint8_t **pk, int *ppklen,
X509_ALGOR **pa, PKCS8_PRIV_KEY_INFO *p8) {
if (ppkalg) {
*ppkalg = p8->pkeyalg->algorithm;
}
if (pk) {
*pk = ASN1_STRING_data(p8->pkey);
*ppklen = ASN1_STRING_length(p8->pkey);
}
if (pa) {
*pa = p8->pkeyalg;
}
return 1;
}
EVP_PKEY *EVP_PKCS82PKEY(PKCS8_PRIV_KEY_INFO *p8) {
uint8_t *der = NULL;
int der_len = i2d_PKCS8_PRIV_KEY_INFO(p8, &der);
if (der_len < 0) {
return NULL;
}
CBS cbs;
CBS_init(&cbs, der, (size_t)der_len);
EVP_PKEY *ret = EVP_parse_private_key(&cbs);
if (ret == NULL || CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR);
EVP_PKEY_free(ret);
OPENSSL_free(der);
return NULL;
}
OPENSSL_free(der);
return ret;
}
PKCS8_PRIV_KEY_INFO *EVP_PKEY2PKCS8(EVP_PKEY *pkey) {
CBB cbb;
uint8_t *der = NULL;
size_t der_len;
if (!CBB_init(&cbb, 0) ||
!EVP_marshal_private_key(&cbb, pkey) ||
!CBB_finish(&cbb, &der, &der_len) ||
der_len > LONG_MAX) {
CBB_cleanup(&cbb);
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_ENCODE_ERROR);
goto err;
}
const uint8_t *p = der;
PKCS8_PRIV_KEY_INFO *p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, (long)der_len);
if (p8 == NULL || p != der + der_len) {
PKCS8_PRIV_KEY_INFO_free(p8);
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR);
goto err;
}
OPENSSL_free(der);
return p8;
err:
OPENSSL_free(der);
return NULL;
}
PKCS8_PRIV_KEY_INFO *PKCS8_decrypt(X509_SIG *pkcs8, const char *pass,
int pass_len_in) {
size_t pass_len;
if (pass_len_in == -1 && pass != NULL) {
pass_len = strlen(pass);
} else {
pass_len = (size_t)pass_len_in;
}
PKCS8_PRIV_KEY_INFO *ret = NULL;
EVP_PKEY *pkey = NULL;
uint8_t *in = NULL;
// Convert the legacy ASN.1 object to a byte string.
int in_len = i2d_X509_SIG(pkcs8, &in);
if (in_len < 0) {
goto err;
}
CBS cbs;
CBS_init(&cbs, in, in_len);
pkey = PKCS8_parse_encrypted_private_key(&cbs, pass, pass_len);
if (pkey == NULL || CBS_len(&cbs) != 0) {
goto err;
}
ret = EVP_PKEY2PKCS8(pkey);
err:
OPENSSL_free(in);
EVP_PKEY_free(pkey);
return ret;
}
X509_SIG *PKCS8_encrypt(int pbe_nid, const EVP_CIPHER *cipher, const char *pass,
int pass_len_in, const uint8_t *salt, size_t salt_len,
int iterations, PKCS8_PRIV_KEY_INFO *p8inf) {
size_t pass_len;
if (pass_len_in == -1 && pass != NULL) {
pass_len = strlen(pass);
} else {
pass_len = (size_t)pass_len_in;
}
// Parse out the private key.
EVP_PKEY *pkey = EVP_PKCS82PKEY(p8inf);
if (pkey == NULL) {
return NULL;
}
X509_SIG *ret = NULL;
uint8_t *der = NULL;
size_t der_len;
CBB cbb;
if (!CBB_init(&cbb, 128) ||
!PKCS8_marshal_encrypted_private_key(&cbb, pbe_nid, cipher, pass,
pass_len, salt, salt_len, iterations,
pkey) ||
!CBB_finish(&cbb, &der, &der_len)) {
CBB_cleanup(&cbb);
goto err;
}
// Convert back to legacy ASN.1 objects.
const uint8_t *ptr = der;
ret = d2i_X509_SIG(NULL, &ptr, der_len);
if (ret == NULL || ptr != der + der_len) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_INTERNAL_ERROR);
X509_SIG_free(ret);
ret = NULL;
}
err:
OPENSSL_free(der);
EVP_PKEY_free(pkey);
return ret;
}
struct pkcs12_context {
EVP_PKEY **out_key;
STACK_OF(X509) *out_certs;
const char *password;
size_t password_len;
};
// PKCS12_handle_sequence parses a BER-encoded SEQUENCE of elements in a PKCS#12
// structure.
static int PKCS12_handle_sequence(
CBS *sequence, struct pkcs12_context *ctx,
int (*handle_element)(CBS *cbs, struct pkcs12_context *ctx)) {
uint8_t *storage = NULL;
CBS in;
int ret = 0;
// Although a BER->DER conversion is done at the beginning of |PKCS12_parse|,
// the ASN.1 data gets wrapped in OCTETSTRINGs and/or encrypted and the
// conversion cannot see through those wrappings. So each time we step
// through one we need to convert to DER again.
if (!CBS_asn1_ber_to_der(sequence, &in, &storage)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
CBS child;
if (!CBS_get_asn1(&in, &child, CBS_ASN1_SEQUENCE) ||
CBS_len(&in) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
while (CBS_len(&child) > 0) {
CBS element;
if (!CBS_get_asn1(&child, &element, CBS_ASN1_SEQUENCE)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (!handle_element(&element, ctx)) {
goto err;
}
}
ret = 1;
err:
OPENSSL_free(storage);
return ret;
}
// 1.2.840.113549.1.12.10.1.1
static const uint8_t kKeyBag[] = {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x01, 0x0c, 0x0a, 0x01, 0x01};
// 1.2.840.113549.1.12.10.1.2
static const uint8_t kPKCS8ShroudedKeyBag[] = {
0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x0c, 0x0a, 0x01, 0x02};
// 1.2.840.113549.1.12.10.1.3
static const uint8_t kCertBag[] = {0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x01, 0x0c, 0x0a, 0x01, 0x03};
// 1.2.840.113549.1.9.20
static const uint8_t kFriendlyName[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x09, 0x14};
// 1.2.840.113549.1.9.21
static const uint8_t kLocalKeyID[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x09, 0x15};
// 1.2.840.113549.1.9.22.1
static const uint8_t kX509Certificate[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x09, 0x16, 0x01};
// parse_bag_attributes parses the bagAttributes field of a SafeBag structure.
// It sets |*out_friendly_name| to a newly-allocated copy of the friendly name,
// encoded as a UTF-8 string, or NULL if there is none. It returns one on
// success and zero on error.
static int parse_bag_attributes(CBS *attrs, uint8_t **out_friendly_name,
size_t *out_friendly_name_len) {
*out_friendly_name = NULL;
*out_friendly_name_len = 0;
// See https://tools.ietf.org/html/rfc7292#section-4.2.
while (CBS_len(attrs) != 0) {
CBS attr, oid, values;
if (!CBS_get_asn1(attrs, &attr, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1(&attr, &oid, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(&attr, &values, CBS_ASN1_SET) ||
CBS_len(&attr) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (CBS_mem_equal(&oid, kFriendlyName, sizeof(kFriendlyName))) {
// See https://tools.ietf.org/html/rfc2985, section 5.5.1.
CBS value;
if (*out_friendly_name != NULL ||
!CBS_get_asn1(&values, &value, CBS_ASN1_BMPSTRING) ||
CBS_len(&values) != 0 ||
CBS_len(&value) == 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
// Convert the friendly name to UTF-8.
CBB cbb;
if (!CBB_init(&cbb, CBS_len(&value))) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
goto err;
}
while (CBS_len(&value) != 0) {
uint32_t c;
if (!cbs_get_ucs2_be(&value, &c) ||
!cbb_add_utf8(&cbb, c)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_INVALID_CHARACTERS);
CBB_cleanup(&cbb);
goto err;
}
}
if (!CBB_finish(&cbb, out_friendly_name, out_friendly_name_len)) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
CBB_cleanup(&cbb);
goto err;
}
}
}
return 1;
err:
OPENSSL_free(*out_friendly_name);
*out_friendly_name = NULL;
*out_friendly_name_len = 0;
return 0;
}
// PKCS12_handle_safe_bag parses a single SafeBag element in a PKCS#12
// structure.
static int PKCS12_handle_safe_bag(CBS *safe_bag, struct pkcs12_context *ctx) {
CBS bag_id, wrapped_value, bag_attrs;
if (!CBS_get_asn1(safe_bag, &bag_id, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(safe_bag, &wrapped_value,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
if (CBS_len(safe_bag) == 0) {
CBS_init(&bag_attrs, NULL, 0);
} else if (!CBS_get_asn1(safe_bag, &bag_attrs, CBS_ASN1_SET) ||
CBS_len(safe_bag) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
const int is_key_bag = CBS_mem_equal(&bag_id, kKeyBag, sizeof(kKeyBag));
const int is_shrouded_key_bag = CBS_mem_equal(&bag_id, kPKCS8ShroudedKeyBag,
sizeof(kPKCS8ShroudedKeyBag));
if (is_key_bag || is_shrouded_key_bag) {
// See RFC 7292, section 4.2.1 and 4.2.2.
if (*ctx->out_key) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_MULTIPLE_PRIVATE_KEYS_IN_PKCS12);
return 0;
}
EVP_PKEY *pkey =
is_key_bag ? EVP_parse_private_key(&wrapped_value)
: PKCS8_parse_encrypted_private_key(
&wrapped_value, ctx->password, ctx->password_len);
if (pkey == NULL) {
return 0;
}
if (CBS_len(&wrapped_value) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
EVP_PKEY_free(pkey);
return 0;
}
*ctx->out_key = pkey;
return 1;
}
if (CBS_mem_equal(&bag_id, kCertBag, sizeof(kCertBag))) {
// See RFC 7292, section 4.2.3.
CBS cert_bag, cert_type, wrapped_cert, cert;
if (!CBS_get_asn1(&wrapped_value, &cert_bag, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1(&cert_bag, &cert_type, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(&cert_bag, &wrapped_cert,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
!CBS_get_asn1(&wrapped_cert, &cert, CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
// Skip unknown certificate types.
if (!CBS_mem_equal(&cert_type, kX509Certificate,
sizeof(kX509Certificate))) {
return 1;
}
if (CBS_len(&cert) > LONG_MAX) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
const uint8_t *inp = CBS_data(&cert);
X509 *x509 = d2i_X509(NULL, &inp, (long)CBS_len(&cert));
if (!x509) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
if (inp != CBS_data(&cert) + CBS_len(&cert)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
X509_free(x509);
return 0;
}
uint8_t *friendly_name;
size_t friendly_name_len;
if (!parse_bag_attributes(&bag_attrs, &friendly_name, &friendly_name_len)) {
X509_free(x509);
return 0;
}
int ok = friendly_name_len == 0 ||
X509_alias_set1(x509, friendly_name, friendly_name_len);
OPENSSL_free(friendly_name);
if (!ok ||
0 == sk_X509_push(ctx->out_certs, x509)) {
X509_free(x509);
return 0;
}
return 1;
}
// Unknown element type - ignore it.
return 1;
}
// 1.2.840.113549.1.7.1
static const uint8_t kPKCS7Data[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x07, 0x01};
// 1.2.840.113549.1.7.6
static const uint8_t kPKCS7EncryptedData[] = {0x2a, 0x86, 0x48, 0x86, 0xf7,
0x0d, 0x01, 0x07, 0x06};
// PKCS12_handle_content_info parses a single PKCS#7 ContentInfo element in a
// PKCS#12 structure.
static int PKCS12_handle_content_info(CBS *content_info,
struct pkcs12_context *ctx) {
CBS content_type, wrapped_contents, contents;
int ret = 0;
uint8_t *storage = NULL;
if (!CBS_get_asn1(content_info, &content_type, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(content_info, &wrapped_contents,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0) ||
CBS_len(content_info) != 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (CBS_mem_equal(&content_type, kPKCS7EncryptedData,
sizeof(kPKCS7EncryptedData))) {
// See https://tools.ietf.org/html/rfc2315#section-13.
//
// PKCS#7 encrypted data inside a PKCS#12 structure is generally an
// encrypted certificate bag and it's generally encrypted with 40-bit
// RC2-CBC.
CBS version_bytes, eci, contents_type, ai, encrypted_contents;
uint8_t *out;
size_t out_len;
if (!CBS_get_asn1(&wrapped_contents, &contents, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1(&contents, &version_bytes, CBS_ASN1_INTEGER) ||
// EncryptedContentInfo, see
// https://tools.ietf.org/html/rfc2315#section-10.1
!CBS_get_asn1(&contents, &eci, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1(&eci, &contents_type, CBS_ASN1_OBJECT) ||
// AlgorithmIdentifier, see
// https://tools.ietf.org/html/rfc5280#section-4.1.1.2
!CBS_get_asn1(&eci, &ai, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1_implicit_string(
&eci, &encrypted_contents, &storage,
CBS_ASN1_CONTEXT_SPECIFIC | 0, CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (!CBS_mem_equal(&contents_type, kPKCS7Data, sizeof(kPKCS7Data))) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (!pkcs8_pbe_decrypt(&out, &out_len, &ai, ctx->password,
ctx->password_len, CBS_data(&encrypted_contents),
CBS_len(&encrypted_contents))) {
goto err;
}
CBS safe_contents;
CBS_init(&safe_contents, out, out_len);
ret = PKCS12_handle_sequence(&safe_contents, ctx, PKCS12_handle_safe_bag);
OPENSSL_free(out);
} else if (CBS_mem_equal(&content_type, kPKCS7Data, sizeof(kPKCS7Data))) {
CBS octet_string_contents;
if (!CBS_get_asn1(&wrapped_contents, &octet_string_contents,
CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
ret = PKCS12_handle_sequence(&octet_string_contents, ctx,
PKCS12_handle_safe_bag);
} else {
// Unknown element type - ignore it.
ret = 1;
}
err:
OPENSSL_free(storage);
return ret;
}
static int pkcs12_check_mac(int *out_mac_ok, const char *password,
size_t password_len, const CBS *salt,
unsigned iterations, const EVP_MD *md,
const CBS *authsafes, const CBS *expected_mac) {
int ret = 0;
uint8_t hmac_key[EVP_MAX_MD_SIZE];
if (!pkcs12_key_gen(password, password_len, CBS_data(salt), CBS_len(salt),
PKCS12_MAC_ID, iterations, EVP_MD_size(md), hmac_key,
md)) {
goto err;
}
uint8_t hmac[EVP_MAX_MD_SIZE];
unsigned hmac_len;
if (NULL == HMAC(md, hmac_key, EVP_MD_size(md), CBS_data(authsafes),
CBS_len(authsafes), hmac, &hmac_len)) {
goto err;
}
*out_mac_ok = CBS_mem_equal(expected_mac, hmac, hmac_len);
#if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
*out_mac_ok = 1;
#endif
ret = 1;
err:
OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
return ret;
}
int PKCS12_get_key_and_certs(EVP_PKEY **out_key, STACK_OF(X509) *out_certs,
CBS *ber_in, const char *password) {
uint8_t *storage = NULL;
CBS in, pfx, mac_data, authsafe, content_type, wrapped_authsafes, authsafes;
uint64_t version;
int ret = 0;
struct pkcs12_context ctx;
const size_t original_out_certs_len = sk_X509_num(out_certs);
// The input may be in BER format.
if (!CBS_asn1_ber_to_der(ber_in, &in, &storage)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
return 0;
}
*out_key = NULL;
OPENSSL_memset(&ctx, 0, sizeof(ctx));
// See ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1.pdf, section
// four.
if (!CBS_get_asn1(&in, &pfx, CBS_ASN1_SEQUENCE) ||
CBS_len(&in) != 0 ||
!CBS_get_asn1_uint64(&pfx, &version)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (version < 3) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_VERSION);
goto err;
}
if (!CBS_get_asn1(&pfx, &authsafe, CBS_ASN1_SEQUENCE)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
if (CBS_len(&pfx) == 0) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_MISSING_MAC);
goto err;
}
if (!CBS_get_asn1(&pfx, &mac_data, CBS_ASN1_SEQUENCE)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
// authsafe is a PKCS#7 ContentInfo. See
// https://tools.ietf.org/html/rfc2315#section-7.
if (!CBS_get_asn1(&authsafe, &content_type, CBS_ASN1_OBJECT) ||
!CBS_get_asn1(&authsafe, &wrapped_authsafes,
CBS_ASN1_CONTEXT_SPECIFIC | CBS_ASN1_CONSTRUCTED | 0)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
// The content type can either be data or signedData. The latter indicates
// that it's signed by a public key, which isn't supported.
if (!CBS_mem_equal(&content_type, kPKCS7Data, sizeof(kPKCS7Data))) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_PKCS12_PUBLIC_KEY_INTEGRITY_NOT_SUPPORTED);
goto err;
}
if (!CBS_get_asn1(&wrapped_authsafes, &authsafes, CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
ctx.out_key = out_key;
ctx.out_certs = out_certs;
ctx.password = password;
ctx.password_len = password != NULL ? strlen(password) : 0;
// Verify the MAC.
{
CBS mac, salt, expected_mac;
if (!CBS_get_asn1(&mac_data, &mac, CBS_ASN1_SEQUENCE)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
const EVP_MD *md = EVP_parse_digest_algorithm(&mac);
if (md == NULL) {
goto err;
}
if (!CBS_get_asn1(&mac, &expected_mac, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1(&mac_data, &salt, CBS_ASN1_OCTETSTRING)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
// The iteration count is optional and the default is one.
uint64_t iterations = 1;
if (CBS_len(&mac_data) > 0) {
if (!CBS_get_asn1_uint64(&mac_data, &iterations) ||
!pkcs12_iterations_acceptable(iterations)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_PKCS12_DATA);
goto err;
}
}
int mac_ok;
if (!pkcs12_check_mac(&mac_ok, ctx.password, ctx.password_len, &salt,
iterations, md, &authsafes, &expected_mac)) {
goto err;
}
if (!mac_ok && ctx.password_len == 0) {
// PKCS#12 encodes passwords as NUL-terminated UCS-2, so the empty
// password is encoded as {0, 0}. Some implementations use the empty byte
// array for "no password". OpenSSL considers a non-NULL password as {0,
// 0} and a NULL password as {}. It then, in high-level PKCS#12 parsing
// code, tries both options. We match this behavior.
ctx.password = ctx.password != NULL ? NULL : "";
if (!pkcs12_check_mac(&mac_ok, ctx.password, ctx.password_len, &salt,
iterations, md, &authsafes, &expected_mac)) {
goto err;
}
}
if (!mac_ok) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_INCORRECT_PASSWORD);
goto err;
}
}
// authsafes contains a series of PKCS#7 ContentInfos.
if (!PKCS12_handle_sequence(&authsafes, &ctx, PKCS12_handle_content_info)) {
goto err;
}
ret = 1;
err:
OPENSSL_free(storage);
if (!ret) {
EVP_PKEY_free(*out_key);
*out_key = NULL;
while (sk_X509_num(out_certs) > original_out_certs_len) {
X509 *x509 = sk_X509_pop(out_certs);
X509_free(x509);
}
}
return ret;
}
void PKCS12_PBE_add(void) {}
struct pkcs12_st {
uint8_t *ber_bytes;
size_t ber_len;
};
PKCS12 *d2i_PKCS12(PKCS12 **out_p12, const uint8_t **ber_bytes,
size_t ber_len) {
PKCS12 *p12;
p12 = OPENSSL_malloc(sizeof(PKCS12));
if (!p12) {
return NULL;
}
p12->ber_bytes = OPENSSL_malloc(ber_len);
if (!p12->ber_bytes) {
OPENSSL_free(p12);
return NULL;
}
OPENSSL_memcpy(p12->ber_bytes, *ber_bytes, ber_len);
p12->ber_len = ber_len;
*ber_bytes += ber_len;
if (out_p12) {
PKCS12_free(*out_p12);
*out_p12 = p12;
}
return p12;
}
PKCS12* d2i_PKCS12_bio(BIO *bio, PKCS12 **out_p12) {
size_t used = 0;
BUF_MEM *buf;
const uint8_t *dummy;
static const size_t kMaxSize = 256 * 1024;
PKCS12 *ret = NULL;
buf = BUF_MEM_new();
if (buf == NULL) {
return NULL;
}
if (BUF_MEM_grow(buf, 8192) == 0) {
goto out;
}
for (;;) {
int n = BIO_read(bio, &buf->data[used], buf->length - used);
if (n < 0) {
if (used == 0) {
goto out;
}
// Workaround a bug in node.js. It uses a memory BIO for this in the wrong
// mode.
n = 0;
}
if (n == 0) {
break;
}
used += n;
if (used < buf->length) {
continue;
}
if (buf->length > kMaxSize ||
BUF_MEM_grow(buf, buf->length * 2) == 0) {
goto out;
}
}
dummy = (uint8_t*) buf->data;
ret = d2i_PKCS12(out_p12, &dummy, used);
out:
BUF_MEM_free(buf);
return ret;
}
PKCS12* d2i_PKCS12_fp(FILE *fp, PKCS12 **out_p12) {
BIO *bio;
PKCS12 *ret;
bio = BIO_new_fp(fp, 0 /* don't take ownership */);
if (!bio) {
return NULL;
}
ret = d2i_PKCS12_bio(bio, out_p12);
BIO_free(bio);
return ret;
}
int i2d_PKCS12(const PKCS12 *p12, uint8_t **out) {
if (p12->ber_len > INT_MAX) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_OVERFLOW);
return -1;
}
if (out == NULL) {
return (int)p12->ber_len;
}
if (*out == NULL) {
*out = OPENSSL_malloc(p12->ber_len);
if (*out == NULL) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
return -1;
}
OPENSSL_memcpy(*out, p12->ber_bytes, p12->ber_len);
} else {
OPENSSL_memcpy(*out, p12->ber_bytes, p12->ber_len);
*out += p12->ber_len;
}
return (int)p12->ber_len;
}
int i2d_PKCS12_bio(BIO *bio, const PKCS12 *p12) {
return BIO_write_all(bio, p12->ber_bytes, p12->ber_len);
}
int i2d_PKCS12_fp(FILE *fp, const PKCS12 *p12) {
BIO *bio = BIO_new_fp(fp, 0 /* don't take ownership */);
if (bio == NULL) {
return 0;
}
int ret = i2d_PKCS12_bio(bio, p12);
BIO_free(bio);
return ret;
}
int PKCS12_parse(const PKCS12 *p12, const char *password, EVP_PKEY **out_pkey,
X509 **out_cert, STACK_OF(X509) **out_ca_certs) {
CBS ber_bytes;
STACK_OF(X509) *ca_certs = NULL;
char ca_certs_alloced = 0;
if (out_ca_certs != NULL && *out_ca_certs != NULL) {
ca_certs = *out_ca_certs;
}
if (!ca_certs) {
ca_certs = sk_X509_new_null();
if (ca_certs == NULL) {
OPENSSL_PUT_ERROR(PKCS8, ERR_R_MALLOC_FAILURE);
return 0;
}
ca_certs_alloced = 1;
}
CBS_init(&ber_bytes, p12->ber_bytes, p12->ber_len);
if (!PKCS12_get_key_and_certs(out_pkey, ca_certs, &ber_bytes, password)) {
if (ca_certs_alloced) {
sk_X509_free(ca_certs);
}
return 0;
}
// OpenSSL selects the last certificate which matches the private key as
// |out_cert|.
*out_cert = NULL;
size_t num_certs = sk_X509_num(ca_certs);
if (*out_pkey != NULL && num_certs > 0) {
for (size_t i = num_certs - 1; i < num_certs; i--) {
X509 *cert = sk_X509_value(ca_certs, i);
if (X509_check_private_key(cert, *out_pkey)) {
*out_cert = cert;
sk_X509_delete(ca_certs, i);
break;
}
ERR_clear_error();
}
}
if (out_ca_certs) {
*out_ca_certs = ca_certs;
} else {
sk_X509_pop_free(ca_certs, X509_free);
}
return 1;
}
int PKCS12_verify_mac(const PKCS12 *p12, const char *password,
int password_len) {
if (password == NULL) {
if (password_len != 0) {
return 0;
}
} else if (password_len != -1 &&
(password[password_len] != 0 ||
OPENSSL_memchr(password, 0, password_len) != NULL)) {
return 0;
}
EVP_PKEY *pkey = NULL;
X509 *cert = NULL;
if (!PKCS12_parse(p12, password, &pkey, &cert, NULL)) {
ERR_clear_error();
return 0;
}
EVP_PKEY_free(pkey);
X509_free(cert);
return 1;
}
// add_bag_attributes adds the bagAttributes field of a SafeBag structure,
// containing the specified friendlyName and localKeyId attributes.
static int add_bag_attributes(CBB *bag, const char *name, const uint8_t *key_id,
size_t key_id_len) {
if (name == NULL && key_id_len == 0) {
return 1; // Omit the OPTIONAL SET.
}
// See https://tools.ietf.org/html/rfc7292#section-4.2.
CBB attrs, attr, oid, values, value;
if (!CBB_add_asn1(bag, &attrs, CBS_ASN1_SET)) {
return 0;
}
if (name != NULL) {
// See https://tools.ietf.org/html/rfc2985, section 5.5.1.
if (!CBB_add_asn1(&attrs, &attr, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&attr, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, kFriendlyName, sizeof(kFriendlyName)) ||
!CBB_add_asn1(&attr, &values, CBS_ASN1_SET) ||
!CBB_add_asn1(&values, &value, CBS_ASN1_BMPSTRING)) {
return 0;
}
// Convert the friendly name to a BMPString.
CBS name_cbs;
CBS_init(&name_cbs, (const uint8_t *)name, strlen(name));
while (CBS_len(&name_cbs) != 0) {
uint32_t c;
if (!cbs_get_utf8(&name_cbs, &c) ||
!cbb_add_ucs2_be(&value, c)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_INVALID_CHARACTERS);
return 0;
}
}
}
if (key_id_len != 0) {
// See https://tools.ietf.org/html/rfc2985, section 5.5.2.
if (!CBB_add_asn1(&attrs, &attr, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&attr, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, kLocalKeyID, sizeof(kLocalKeyID)) ||
!CBB_add_asn1(&attr, &values, CBS_ASN1_SET) ||
!CBB_add_asn1(&values, &value, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&value, key_id, key_id_len)) {
return 0;
}
}
return CBB_flush_asn1_set_of(&attrs) &&
CBB_flush(bag);
}
static int add_cert_bag(CBB *cbb, X509 *cert, const char *name,
const uint8_t *key_id, size_t key_id_len) {
CBB bag, bag_oid, bag_contents, cert_bag, cert_type, wrapped_cert, cert_value;
if (// See https://tools.ietf.org/html/rfc7292#section-4.2.
!CBB_add_asn1(cbb, &bag, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&bag, &bag_oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&bag_oid, kCertBag, sizeof(kCertBag)) ||
!CBB_add_asn1(&bag, &bag_contents,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
// See https://tools.ietf.org/html/rfc7292#section-4.2.3.
!CBB_add_asn1(&bag_contents, &cert_bag, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&cert_bag, &cert_type, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&cert_type, kX509Certificate, sizeof(kX509Certificate)) ||
!CBB_add_asn1(&cert_bag, &wrapped_cert,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!CBB_add_asn1(&wrapped_cert, &cert_value, CBS_ASN1_OCTETSTRING)) {
return 0;
}
uint8_t *buf;
int len = i2d_X509(cert, NULL);
if (len < 0 ||
!CBB_add_space(&cert_value, &buf, (size_t)len) ||
i2d_X509(cert, &buf) < 0 ||
!add_bag_attributes(&bag, name, key_id, key_id_len) ||
!CBB_flush(cbb)) {
return 0;
}
return 1;
}
static int add_cert_safe_contents(CBB *cbb, X509 *cert,
const STACK_OF(X509) *chain, const char *name,
const uint8_t *key_id, size_t key_id_len) {
CBB safe_contents;
if (!CBB_add_asn1(cbb, &safe_contents, CBS_ASN1_SEQUENCE) ||
(cert != NULL &&
!add_cert_bag(&safe_contents, cert, name, key_id, key_id_len))) {
return 0;
}
for (size_t i = 0; i < sk_X509_num(chain); i++) {
// Only the leaf certificate gets attributes.
if (!add_cert_bag(&safe_contents, sk_X509_value(chain, i), NULL, NULL, 0)) {
return 0;
}
}
return CBB_flush(cbb);
}
static int add_encrypted_data(CBB *out, int pbe_nid, const char *password,
size_t password_len, unsigned iterations,
const uint8_t *in, size_t in_len) {
uint8_t salt[PKCS5_SALT_LEN];
if (!RAND_bytes(salt, sizeof(salt))) {
return 0;
}
int ret = 0;
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
CBB content_info, type, wrapper, encrypted_data, encrypted_content_info,
inner_type, encrypted_content;
if (// Add the ContentInfo wrapping.
!CBB_add_asn1(out, &content_info, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&content_info, &type, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&type, kPKCS7EncryptedData, sizeof(kPKCS7EncryptedData)) ||
!CBB_add_asn1(&content_info, &wrapper,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
// See https://tools.ietf.org/html/rfc2315#section-13.
!CBB_add_asn1(&wrapper, &encrypted_data, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1_uint64(&encrypted_data, 0 /* version */) ||
// See https://tools.ietf.org/html/rfc2315#section-10.1.
!CBB_add_asn1(&encrypted_data, &encrypted_content_info,
CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&encrypted_content_info, &inner_type, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&inner_type, kPKCS7Data, sizeof(kPKCS7Data)) ||
// Set up encryption and fill in contentEncryptionAlgorithm.
!pkcs12_pbe_encrypt_init(&encrypted_content_info, &ctx, pbe_nid,
iterations, password, password_len, salt,
sizeof(salt)) ||
// Note this tag is primitive. It is an implicitly-tagged OCTET_STRING, so
// it inherits the inner tag's constructed bit.
!CBB_add_asn1(&encrypted_content_info, &encrypted_content,
CBS_ASN1_CONTEXT_SPECIFIC | 0)) {
goto err;
}
size_t max_out = in_len + EVP_CIPHER_CTX_block_size(&ctx);
if (max_out < in_len) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_TOO_LONG);
goto err;
}
uint8_t *ptr;
int n1, n2;
if (!CBB_reserve(&encrypted_content, &ptr, max_out) ||
!EVP_CipherUpdate(&ctx, ptr, &n1, in, in_len) ||
!EVP_CipherFinal_ex(&ctx, ptr + n1, &n2) ||
!CBB_did_write(&encrypted_content, n1 + n2) ||
!CBB_flush(out)) {
goto err;
}
ret = 1;
err:
EVP_CIPHER_CTX_cleanup(&ctx);
return ret;
}
PKCS12 *PKCS12_create(const char *password, const char *name,
const EVP_PKEY *pkey, X509 *cert,
const STACK_OF(X509)* chain, int key_nid, int cert_nid,
int iterations, int mac_iterations, int key_type) {
if (key_nid == 0) {
key_nid = NID_pbe_WithSHA1And3_Key_TripleDES_CBC;
}
if (cert_nid == 0) {
cert_nid = NID_pbe_WithSHA1And40BitRC2_CBC;
}
if (iterations == 0) {
iterations = PKCS5_DEFAULT_ITERATIONS;
}
if (mac_iterations == 0) {
mac_iterations = 1;
}
if (// In OpenSSL, this specifies a non-standard Microsoft key usage extension
// which we do not currently support.
key_type != 0 ||
// In OpenSSL, -1 here means to omit the MAC, which we do not
// currently support. Omitting it is also invalid for a password-based
// PKCS#12 file.
mac_iterations < 0 ||
// Don't encode empty objects.
(pkey == NULL && cert == NULL && sk_X509_num(chain) == 0)) {
OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNSUPPORTED_OPTIONS);
return 0;
}
// PKCS#12 is a very confusing recursive data format, built out of another
// recursive data format. Section 5.1 of RFC7292 describes the encoding
// algorithm, but there is no clear overview. A quick summary:
//
// PKCS#7 defines a ContentInfo structure, which is a overgeneralized typed
// combinator structure for applying cryptography. We care about two types. A
// data ContentInfo contains an OCTET STRING and is a leaf node of the
// combinator tree. An encrypted-data ContentInfo contains encryption
// parameters (key derivation and encryption) and wraps another ContentInfo,
// usually data.
//
// A PKCS#12 file is a PFX structure (section 4), which contains a single data
// ContentInfo and a MAC over it. This root ContentInfo is the
// AuthenticatedSafe and its payload is a SEQUENCE of other ContentInfos, so
// that different parts of the PKCS#12 file can by differently protected.
//
// Each ContentInfo in the AuthenticatedSafe, after undoing all the PKCS#7
// combinators, has SafeContents payload. A SafeContents is a SEQUENCE of
// SafeBag. SafeBag is PKCS#12's typed structure, with subtypes such as KeyBag
// and CertBag. Confusingly, there is a SafeContents bag type which itself
// recursively contains more SafeBags, but we do not implement this. Bags also
// can have attributes.
//
// The grouping of SafeBags into intermediate ContentInfos does not appear to
// be significant, except that all SafeBags sharing a ContentInfo have the
// same level of protection. Additionally, while keys may be encrypted by
// placing a KeyBag in an encrypted-data ContentInfo, PKCS#12 also defines a
// key-specific encryption container, PKCS8ShroudedKeyBag, which is used
// instead.
// Note that |password| may be NULL to specify no password, rather than the
// empty string. They are encoded differently in PKCS#12. (One is the empty
// byte array and the other is NUL-terminated UCS-2.)
size_t password_len = password != NULL ? strlen(password) : 0;
uint8_t key_id[EVP_MAX_MD_SIZE];
unsigned key_id_len = 0;
if (cert != NULL && pkey != NULL) {
if (!X509_check_private_key(cert, pkey) ||
// Matching OpenSSL, use the SHA-1 hash of the certificate as the local
// key ID. Some PKCS#12 consumers require one to connect the private key
// and certificate.
!X509_digest(cert, EVP_sha1(), key_id, &key_id_len)) {
return 0;
}
}
// See https://tools.ietf.org/html/rfc7292#section-4.
PKCS12 *ret = NULL;
CBB cbb, pfx, auth_safe, auth_safe_oid, auth_safe_wrapper, auth_safe_data,
content_infos;
uint8_t mac_key[EVP_MAX_MD_SIZE];
if (!CBB_init(&cbb, 0) ||
!CBB_add_asn1(&cbb, &pfx, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1_uint64(&pfx, 3) ||
// auth_safe is a data ContentInfo.
!CBB_add_asn1(&pfx, &auth_safe, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&auth_safe, &auth_safe_oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&auth_safe_oid, kPKCS7Data, sizeof(kPKCS7Data)) ||
!CBB_add_asn1(&auth_safe, &auth_safe_wrapper,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!CBB_add_asn1(&auth_safe_wrapper, &auth_safe_data,
CBS_ASN1_OCTETSTRING) ||
// See https://tools.ietf.org/html/rfc7292#section-4.1. |auth_safe|'s
// contains a SEQUENCE of ContentInfos.
!CBB_add_asn1(&auth_safe_data, &content_infos, CBS_ASN1_SEQUENCE)) {
goto err;
}
// If there are any certificates, place them in CertBags wrapped in a single
// encrypted ContentInfo.
if (cert != NULL || sk_X509_num(chain) > 0) {
if (cert_nid < 0) {
// Place the certificates in an unencrypted ContentInfo. This could be
// more compactly-encoded by reusing the same ContentInfo as the key, but
// OpenSSL does not do this. We keep them separate for consistency. (Keys,
// even when encrypted, are always placed in unencrypted ContentInfos.
// PKCS#12 defines bag-level encryption for keys.)
CBB content_info, oid, wrapper, data;
if (!CBB_add_asn1(&content_infos, &content_info, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&content_info, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, kPKCS7Data, sizeof(kPKCS7Data)) ||
!CBB_add_asn1(&content_info, &wrapper,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!CBB_add_asn1(&wrapper, &data, CBS_ASN1_OCTETSTRING) ||
!add_cert_safe_contents(&data, cert, chain, name, key_id,
key_id_len) ||
!CBB_flush(&content_infos)) {
goto err;
}
} else {
CBB plaintext_cbb;
int ok = CBB_init(&plaintext_cbb, 0) &&
add_cert_safe_contents(&plaintext_cbb, cert, chain, name, key_id,
key_id_len) &&
add_encrypted_data(
&content_infos, cert_nid, password, password_len, iterations,
CBB_data(&plaintext_cbb), CBB_len(&plaintext_cbb));
CBB_cleanup(&plaintext_cbb);
if (!ok) {
goto err;
}
}
}
// If there is a key, place it in a single KeyBag or PKCS8ShroudedKeyBag
// wrapped in an unencrypted ContentInfo. (One could also place it in a KeyBag
// inside an encrypted ContentInfo, but OpenSSL does not do this and some
// PKCS#12 consumers do not support KeyBags.)
if (pkey != NULL) {
CBB content_info, oid, wrapper, data, safe_contents, bag, bag_oid,
bag_contents;
if (// Add another data ContentInfo.
!CBB_add_asn1(&content_infos, &content_info, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&content_info, &oid, CBS_ASN1_OBJECT) ||
!CBB_add_bytes(&oid, kPKCS7Data, sizeof(kPKCS7Data)) ||
!CBB_add_asn1(&content_info, &wrapper,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!CBB_add_asn1(&wrapper, &data, CBS_ASN1_OCTETSTRING) ||
!CBB_add_asn1(&data, &safe_contents, CBS_ASN1_SEQUENCE) ||
// Add a SafeBag containing a PKCS8ShroudedKeyBag.
!CBB_add_asn1(&safe_contents, &bag, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&bag, &bag_oid, CBS_ASN1_OBJECT)) {
goto err;
}
if (key_nid < 0) {
if (!CBB_add_bytes(&bag_oid, kKeyBag, sizeof(kKeyBag)) ||
!CBB_add_asn1(&bag, &bag_contents,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!EVP_marshal_private_key(&bag_contents, pkey)) {
goto err;
}
} else {
if (!CBB_add_bytes(&bag_oid, kPKCS8ShroudedKeyBag,
sizeof(kPKCS8ShroudedKeyBag)) ||
!CBB_add_asn1(&bag, &bag_contents,
CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) ||
!PKCS8_marshal_encrypted_private_key(
&bag_contents, key_nid, NULL, password, password_len,
NULL /* generate a random salt */,
0 /* use default salt length */, iterations, pkey)) {
goto err;
}
}
if (!add_bag_attributes(&bag, name, key_id, key_id_len) ||
!CBB_flush(&content_infos)) {
goto err;
}
}
// Compute the MAC. Match OpenSSL in using SHA-1 as the hash function. The MAC
// covers |auth_safe_data|.
const EVP_MD *mac_md = EVP_sha1();
uint8_t mac_salt[PKCS5_SALT_LEN];
uint8_t mac[EVP_MAX_MD_SIZE];
unsigned mac_len;
if (!CBB_flush(&auth_safe_data) ||
!RAND_bytes(mac_salt, sizeof(mac_salt)) ||
!pkcs12_key_gen(password, password_len, mac_salt, sizeof(mac_salt),
PKCS12_MAC_ID, mac_iterations, EVP_MD_size(mac_md),
mac_key, mac_md) ||
!HMAC(mac_md, mac_key, EVP_MD_size(mac_md), CBB_data(&auth_safe_data),
CBB_len(&auth_safe_data), mac, &mac_len)) {
goto err;
}
CBB mac_data, digest_info, mac_cbb, mac_salt_cbb;
if (!CBB_add_asn1(&pfx, &mac_data, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1(&mac_data, &digest_info, CBS_ASN1_SEQUENCE) ||
!EVP_marshal_digest_algorithm(&digest_info, mac_md) ||
!CBB_add_asn1(&digest_info, &mac_cbb, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&mac_cbb, mac, mac_len) ||
!CBB_add_asn1(&mac_data, &mac_salt_cbb, CBS_ASN1_OCTETSTRING) ||
!CBB_add_bytes(&mac_salt_cbb, mac_salt, sizeof(mac_salt)) ||
// The iteration count has a DEFAULT of 1, but RFC 7292 says "The default
// is for historical reasons and its use is deprecated." Thus we
// explicitly encode the iteration count, though it is not valid DER.
!CBB_add_asn1_uint64(&mac_data, mac_iterations)) {
goto err;
}
ret = OPENSSL_malloc(sizeof(PKCS12));
if (ret == NULL ||
!CBB_finish(&cbb, &ret->ber_bytes, &ret->ber_len)) {
OPENSSL_free(ret);
ret = NULL;
goto err;
}
err:
OPENSSL_cleanse(mac_key, sizeof(mac_key));
CBB_cleanup(&cbb);
return ret;
}
void PKCS12_free(PKCS12 *p12) {
if (p12 == NULL) {
return;
}
OPENSSL_free(p12->ber_bytes);
OPENSSL_free(p12);
}
|