1 /* 2 * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /* Simple PKCS#7 processing functions */ 11 12 #include <stdio.h> 13 #include "internal/cryptlib.h" 14 #include <openssl/x509.h> 15 #include <openssl/x509v3.h> 16 #include "pk7_local.h" 17 18 #define BUFFERSIZE 4096 19 20 21 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si); 22 23 PKCS7 *PKCS7_sign_ex(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, 24 BIO *data, int flags, OSSL_LIB_CTX *libctx, 25 const char *propq) 26 { 27 PKCS7 *p7; 28 int i; 29 30 if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) { 31 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 32 return NULL; 33 } 34 35 if (!PKCS7_set_type(p7, NID_pkcs7_signed)) 36 goto err; 37 38 if (!PKCS7_content_new(p7, NID_pkcs7_data)) 39 goto err; 40 41 if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) { 42 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNER_ERROR); 43 goto err; 44 } 45 46 if (!(flags & PKCS7_NOCERTS)) { 47 for (i = 0; i < sk_X509_num(certs); i++) { 48 if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i))) 49 goto err; 50 } 51 } 52 53 if (flags & PKCS7_DETACHED) 54 PKCS7_set_detached(p7, 1); 55 56 if (flags & (PKCS7_STREAM | PKCS7_PARTIAL)) 57 return p7; 58 59 if (PKCS7_final(p7, data, flags)) 60 return p7; 61 62 err: 63 PKCS7_free(p7); 64 return NULL; 65 } 66 67 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, 68 BIO *data, int flags) 69 { 70 return PKCS7_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL); 71 } 72 73 74 int PKCS7_final(PKCS7 *p7, BIO *data, int flags) 75 { 76 BIO *p7bio; 77 int ret = 0; 78 79 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) { 80 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 81 return 0; 82 } 83 84 if (!SMIME_crlf_copy(data, p7bio, flags)) 85 goto err; 86 87 (void)BIO_flush(p7bio); 88 89 if (!PKCS7_dataFinal(p7, p7bio)) { 90 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_DATASIGN); 91 goto err; 92 } 93 ret = 1; 94 err: 95 BIO_free_all(p7bio); 96 97 return ret; 98 99 } 100 101 /* Check to see if a cipher exists and if so add S/MIME capabilities */ 102 103 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg) 104 { 105 if (EVP_get_cipherbynid(nid)) 106 return PKCS7_simple_smimecap(sk, nid, arg); 107 return 1; 108 } 109 110 static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg) 111 { 112 if (EVP_get_digestbynid(nid)) 113 return PKCS7_simple_smimecap(sk, nid, arg); 114 return 1; 115 } 116 117 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, 118 EVP_PKEY *pkey, const EVP_MD *md, 119 int flags) 120 { 121 PKCS7_SIGNER_INFO *si = NULL; 122 STACK_OF(X509_ALGOR) *smcap = NULL; 123 124 if (!X509_check_private_key(signcert, pkey)) { 125 ERR_raise(ERR_LIB_PKCS7, 126 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 127 return NULL; 128 } 129 130 if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) { 131 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR); 132 return NULL; 133 } 134 135 si->ctx = ossl_pkcs7_get0_ctx(p7); 136 if (!(flags & PKCS7_NOCERTS)) { 137 if (!PKCS7_add_certificate(p7, signcert)) 138 goto err; 139 } 140 141 if (!(flags & PKCS7_NOATTR)) { 142 if (!PKCS7_add_attrib_content_type(si, NULL)) 143 goto err; 144 /* Add SMIMECapabilities */ 145 if (!(flags & PKCS7_NOSMIMECAP)) { 146 if ((smcap = sk_X509_ALGOR_new_null()) == NULL) { 147 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 148 goto err; 149 } 150 if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1) 151 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1) 152 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1) 153 || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1) 154 || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1) 155 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1) 156 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1) 157 || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1) 158 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128) 159 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64) 160 || !add_cipher_smcap(smcap, NID_des_cbc, -1) 161 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40) 162 || !PKCS7_add_attrib_smimecap(si, smcap)) 163 goto err; 164 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); 165 smcap = NULL; 166 } 167 if (flags & PKCS7_REUSE_DIGEST) { 168 if (!pkcs7_copy_existing_digest(p7, si)) 169 goto err; 170 if (!(flags & PKCS7_PARTIAL) 171 && !PKCS7_SIGNER_INFO_sign(si)) 172 goto err; 173 } 174 } 175 return si; 176 err: 177 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); 178 return NULL; 179 } 180 181 /* 182 * Search for a digest matching SignerInfo digest type and if found copy 183 * across. 184 */ 185 186 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si) 187 { 188 int i; 189 STACK_OF(PKCS7_SIGNER_INFO) *sinfos; 190 PKCS7_SIGNER_INFO *sitmp; 191 ASN1_OCTET_STRING *osdig = NULL; 192 sinfos = PKCS7_get_signer_info(p7); 193 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) { 194 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i); 195 if (si == sitmp) 196 break; 197 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0) 198 continue; 199 if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) { 200 osdig = PKCS7_digest_from_attributes(sitmp->auth_attr); 201 break; 202 } 203 204 } 205 206 if (osdig != NULL) 207 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length); 208 209 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND); 210 return 0; 211 } 212 213 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, 214 BIO *indata, BIO *out, int flags) 215 { 216 STACK_OF(X509) *signers; 217 X509 *signer; 218 STACK_OF(PKCS7_SIGNER_INFO) *sinfos; 219 PKCS7_SIGNER_INFO *si; 220 X509_STORE_CTX *cert_ctx = NULL; 221 char *buf = NULL; 222 int i, j = 0, k, ret = 0; 223 BIO *p7bio = NULL; 224 BIO *tmpin = NULL, *tmpout = NULL; 225 const PKCS7_CTX *p7_ctx; 226 227 if (p7 == NULL) { 228 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER); 229 return 0; 230 } 231 232 if (!PKCS7_type_is_signed(p7)) { 233 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE); 234 return 0; 235 } 236 237 /* Check for no data and no content: no data to verify signature */ 238 if (PKCS7_get_detached(p7) && !indata) { 239 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT); 240 return 0; 241 } 242 243 if (flags & PKCS7_NO_DUAL_CONTENT) { 244 /* 245 * This was originally "#if 0" because we thought that only old broken 246 * Netscape did this. It turns out that Authenticode uses this kind 247 * of "extended" PKCS7 format, and things like UEFI secure boot and 248 * tools like osslsigncode need it. In Authenticode the verification 249 * process is different, but the existing PKCs7 verification works. 250 */ 251 if (!PKCS7_get_detached(p7) && indata) { 252 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CONTENT_AND_DATA_PRESENT); 253 return 0; 254 } 255 } 256 257 sinfos = PKCS7_get_signer_info(p7); 258 259 if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) { 260 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNATURES_ON_DATA); 261 return 0; 262 } 263 264 signers = PKCS7_get0_signers(p7, certs, flags); 265 if (signers == NULL) 266 return 0; 267 268 /* Now verify the certificates */ 269 p7_ctx = ossl_pkcs7_get0_ctx(p7); 270 cert_ctx = X509_STORE_CTX_new_ex(ossl_pkcs7_ctx_get0_libctx(p7_ctx), 271 ossl_pkcs7_ctx_get0_propq(p7_ctx)); 272 if (cert_ctx == NULL) 273 goto err; 274 if (!(flags & PKCS7_NOVERIFY)) 275 for (k = 0; k < sk_X509_num(signers); k++) { 276 signer = sk_X509_value(signers, k); 277 if (!(flags & PKCS7_NOCHAIN)) { 278 if (!X509_STORE_CTX_init(cert_ctx, store, signer, 279 p7->d.sign->cert)) { 280 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB); 281 goto err; 282 } 283 if (!X509_STORE_CTX_set_default(cert_ctx, "smime_sign")) 284 goto err; 285 } else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) { 286 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB); 287 goto err; 288 } 289 if (!(flags & PKCS7_NOCRL)) 290 X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl); 291 i = X509_verify_cert(cert_ctx); 292 if (i <= 0) 293 j = X509_STORE_CTX_get_error(cert_ctx); 294 if (i <= 0) { 295 ERR_raise_data(ERR_LIB_PKCS7, PKCS7_R_CERTIFICATE_VERIFY_ERROR, 296 "Verify error: %s", 297 X509_verify_cert_error_string(j)); 298 goto err; 299 } 300 /* Check for revocation status here */ 301 } 302 303 /* 304 * Performance optimization: if the content is a memory BIO then store 305 * its contents in a temporary read only memory BIO. This avoids 306 * potentially large numbers of slow copies of data which will occur when 307 * reading from a read write memory BIO when signatures are calculated. 308 */ 309 310 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) { 311 char *ptr; 312 long len; 313 len = BIO_get_mem_data(indata, &ptr); 314 tmpin = (len == 0) ? indata : BIO_new_mem_buf(ptr, len); 315 if (tmpin == NULL) { 316 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 317 goto err; 318 } 319 } else 320 tmpin = indata; 321 322 if ((p7bio = PKCS7_dataInit(p7, tmpin)) == NULL) 323 goto err; 324 325 if (flags & PKCS7_TEXT) { 326 if ((tmpout = BIO_new(BIO_s_mem())) == NULL) { 327 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 328 goto err; 329 } 330 BIO_set_mem_eof_return(tmpout, 0); 331 } else 332 tmpout = out; 333 334 /* We now have to 'read' from p7bio to calculate digests etc. */ 335 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) { 336 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 337 goto err; 338 } 339 for (;;) { 340 i = BIO_read(p7bio, buf, BUFFERSIZE); 341 if (i <= 0) 342 break; 343 if (tmpout) 344 BIO_write(tmpout, buf, i); 345 } 346 347 if (flags & PKCS7_TEXT) { 348 if (!SMIME_text(tmpout, out)) { 349 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SMIME_TEXT_ERROR); 350 BIO_free(tmpout); 351 goto err; 352 } 353 BIO_free(tmpout); 354 } 355 356 /* Now Verify All Signatures */ 357 if (!(flags & PKCS7_NOSIGS)) 358 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) { 359 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i); 360 signer = sk_X509_value(signers, i); 361 j = PKCS7_signatureVerify(p7bio, p7, si, signer); 362 if (j <= 0) { 363 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE); 364 goto err; 365 } 366 } 367 368 ret = 1; 369 370 err: 371 X509_STORE_CTX_free(cert_ctx); 372 OPENSSL_free(buf); 373 if (tmpin == indata) { 374 if (indata) 375 BIO_pop(p7bio); 376 } 377 BIO_free_all(p7bio); 378 sk_X509_free(signers); 379 return ret; 380 } 381 382 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, 383 int flags) 384 { 385 STACK_OF(X509) *signers; 386 STACK_OF(PKCS7_SIGNER_INFO) *sinfos; 387 PKCS7_SIGNER_INFO *si; 388 PKCS7_ISSUER_AND_SERIAL *ias; 389 X509 *signer; 390 int i; 391 392 if (p7 == NULL) { 393 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER); 394 return NULL; 395 } 396 397 if (!PKCS7_type_is_signed(p7)) { 398 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE); 399 return NULL; 400 } 401 402 /* Collect all the signers together */ 403 404 sinfos = PKCS7_get_signer_info(p7); 405 406 if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) { 407 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNERS); 408 return 0; 409 } 410 411 if ((signers = sk_X509_new_null()) == NULL) { 412 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 413 return NULL; 414 } 415 416 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) { 417 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i); 418 ias = si->issuer_and_serial; 419 signer = NULL; 420 /* If any certificates passed they take priority */ 421 if (certs) 422 signer = X509_find_by_issuer_and_serial(certs, 423 ias->issuer, ias->serial); 424 if (!signer && !(flags & PKCS7_NOINTERN) 425 && p7->d.sign->cert) 426 signer = 427 X509_find_by_issuer_and_serial(p7->d.sign->cert, 428 ias->issuer, ias->serial); 429 if (!signer) { 430 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND); 431 sk_X509_free(signers); 432 return 0; 433 } 434 435 if (!sk_X509_push(signers, signer)) { 436 sk_X509_free(signers); 437 return NULL; 438 } 439 } 440 return signers; 441 } 442 443 /* Build a complete PKCS#7 enveloped data */ 444 445 PKCS7 *PKCS7_encrypt_ex(STACK_OF(X509) *certs, BIO *in, 446 const EVP_CIPHER *cipher, int flags, 447 OSSL_LIB_CTX *libctx, const char *propq) 448 { 449 PKCS7 *p7; 450 BIO *p7bio = NULL; 451 int i; 452 X509 *x509; 453 454 if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) { 455 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 456 return NULL; 457 } 458 459 if (!PKCS7_set_type(p7, NID_pkcs7_enveloped)) 460 goto err; 461 if (!PKCS7_set_cipher(p7, cipher)) { 462 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_SETTING_CIPHER); 463 goto err; 464 } 465 466 for (i = 0; i < sk_X509_num(certs); i++) { 467 x509 = sk_X509_value(certs, i); 468 if (!PKCS7_add_recipient(p7, x509)) { 469 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_ADDING_RECIPIENT); 470 goto err; 471 } 472 } 473 474 if (flags & PKCS7_STREAM) 475 return p7; 476 477 if (PKCS7_final(p7, in, flags)) 478 return p7; 479 480 err: 481 482 BIO_free_all(p7bio); 483 PKCS7_free(p7); 484 return NULL; 485 486 } 487 488 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, 489 int flags) 490 { 491 return PKCS7_encrypt_ex(certs, in, cipher, flags, NULL, NULL); 492 } 493 494 495 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags) 496 { 497 BIO *tmpmem; 498 int ret = 0, i; 499 char *buf = NULL; 500 501 if (p7 == NULL) { 502 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER); 503 return 0; 504 } 505 506 if (!PKCS7_type_is_enveloped(p7)) { 507 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE); 508 return 0; 509 } 510 511 if (cert && !X509_check_private_key(cert, pkey)) { 512 ERR_raise(ERR_LIB_PKCS7, 513 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 514 return 0; 515 } 516 517 if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) { 518 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DECRYPT_ERROR); 519 return 0; 520 } 521 522 if (flags & PKCS7_TEXT) { 523 BIO *tmpbuf, *bread; 524 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */ 525 if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) { 526 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 527 BIO_free_all(tmpmem); 528 return 0; 529 } 530 if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) { 531 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 532 BIO_free_all(tmpbuf); 533 BIO_free_all(tmpmem); 534 return 0; 535 } 536 ret = SMIME_text(bread, data); 537 if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) { 538 if (BIO_get_cipher_status(tmpmem) <= 0) 539 ret = 0; 540 } 541 BIO_free_all(bread); 542 return ret; 543 } 544 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) { 545 ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE); 546 goto err; 547 } 548 for (;;) { 549 i = BIO_read(tmpmem, buf, BUFFERSIZE); 550 if (i <= 0) { 551 ret = 1; 552 if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) { 553 if (BIO_get_cipher_status(tmpmem) <= 0) 554 ret = 0; 555 } 556 557 break; 558 } 559 if (BIO_write(data, buf, i) != i) { 560 break; 561 } 562 } 563 err: 564 OPENSSL_free(buf); 565 BIO_free_all(tmpmem); 566 return ret; 567 } 568