Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* pk7_smime.c */ |
| 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 3 | * project. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in |
| 17 | * the documentation and/or other materials provided with the |
| 18 | * distribution. |
| 19 | * |
| 20 | * 3. All advertising materials mentioning features or use of this |
| 21 | * software must display the following acknowledgment: |
| 22 | * "This product includes software developed by the OpenSSL Project |
| 23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 24 | * |
| 25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 26 | * endorse or promote products derived from this software without |
| 27 | * prior written permission. For written permission, please contact |
| 28 | * licensing@OpenSSL.org. |
| 29 | * |
| 30 | * 5. Products derived from this software may not be called "OpenSSL" |
| 31 | * nor may "OpenSSL" appear in their names without prior written |
| 32 | * permission of the OpenSSL Project. |
| 33 | * |
| 34 | * 6. Redistributions of any form whatsoever must retain the following |
| 35 | * acknowledgment: |
| 36 | * "This product includes software developed by the OpenSSL Project |
| 37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 38 | * |
| 39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 50 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 51 | * ==================================================================== |
| 52 | * |
| 53 | * This product includes cryptographic software written by Eric Young |
| 54 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@cryptsoft.com). |
| 56 | * |
| 57 | */ |
| 58 | |
| 59 | /* Simple PKCS#7 processing functions */ |
| 60 | |
| 61 | #include <stdio.h> |
| 62 | #include "cryptlib.h" |
| 63 | #include <openssl/x509.h> |
| 64 | #include <openssl/x509v3.h> |
| 65 | |
| 66 | static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si); |
| 67 | |
| 68 | PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, |
| 69 | BIO *data, int flags) |
| 70 | { |
| 71 | PKCS7 *p7; |
| 72 | int i; |
| 73 | |
| 74 | if(!(p7 = PKCS7_new())) |
| 75 | { |
| 76 | PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE); |
| 77 | return NULL; |
| 78 | } |
| 79 | |
| 80 | if (!PKCS7_set_type(p7, NID_pkcs7_signed)) |
| 81 | goto err; |
| 82 | |
| 83 | if (!PKCS7_content_new(p7, NID_pkcs7_data)) |
| 84 | goto err; |
| 85 | |
| 86 | if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) |
| 87 | { |
| 88 | PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNER_ERROR); |
| 89 | goto err; |
| 90 | } |
| 91 | |
| 92 | if(!(flags & PKCS7_NOCERTS)) |
| 93 | { |
| 94 | for(i = 0; i < sk_X509_num(certs); i++) |
| 95 | { |
| 96 | if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i))) |
| 97 | goto err; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | if(flags & PKCS7_DETACHED) |
| 102 | PKCS7_set_detached(p7, 1); |
| 103 | |
| 104 | if (flags & (PKCS7_STREAM|PKCS7_PARTIAL)) |
| 105 | return p7; |
| 106 | |
| 107 | if (PKCS7_final(p7, data, flags)) |
| 108 | return p7; |
| 109 | |
| 110 | err: |
| 111 | PKCS7_free(p7); |
| 112 | return NULL; |
| 113 | } |
| 114 | |
| 115 | int PKCS7_final(PKCS7 *p7, BIO *data, int flags) |
| 116 | { |
| 117 | BIO *p7bio; |
| 118 | int ret = 0; |
| 119 | if (!(p7bio = PKCS7_dataInit(p7, NULL))) |
| 120 | { |
| 121 | PKCS7err(PKCS7_F_PKCS7_FINAL,ERR_R_MALLOC_FAILURE); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | SMIME_crlf_copy(data, p7bio, flags); |
| 126 | |
| 127 | (void)BIO_flush(p7bio); |
| 128 | |
| 129 | |
| 130 | if (!PKCS7_dataFinal(p7,p7bio)) |
| 131 | { |
| 132 | PKCS7err(PKCS7_F_PKCS7_FINAL,PKCS7_R_PKCS7_DATASIGN); |
| 133 | goto err; |
| 134 | } |
| 135 | |
| 136 | ret = 1; |
| 137 | |
| 138 | err: |
| 139 | BIO_free_all(p7bio); |
| 140 | |
| 141 | return ret; |
| 142 | |
| 143 | } |
| 144 | |
| 145 | /* Check to see if a cipher exists and if so add S/MIME capabilities */ |
| 146 | |
| 147 | static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg) |
| 148 | { |
| 149 | if (EVP_get_cipherbynid(nid)) |
| 150 | return PKCS7_simple_smimecap(sk, nid, arg); |
| 151 | return 1; |
| 152 | } |
| 153 | |
| 154 | static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg) |
| 155 | { |
| 156 | if (EVP_get_digestbynid(nid)) |
| 157 | return PKCS7_simple_smimecap(sk, nid, arg); |
| 158 | return 1; |
| 159 | } |
| 160 | |
| 161 | PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, |
| 162 | EVP_PKEY *pkey, const EVP_MD *md, |
| 163 | int flags) |
| 164 | { |
| 165 | PKCS7_SIGNER_INFO *si = NULL; |
| 166 | STACK_OF(X509_ALGOR) *smcap = NULL; |
| 167 | if(!X509_check_private_key(signcert, pkey)) |
| 168 | { |
| 169 | PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, |
| 170 | PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); |
| 171 | return NULL; |
| 172 | } |
| 173 | |
| 174 | if (!(si = PKCS7_add_signature(p7,signcert,pkey, md))) |
| 175 | { |
| 176 | PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, |
| 177 | PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR); |
| 178 | return NULL; |
| 179 | } |
| 180 | |
| 181 | if(!(flags & PKCS7_NOCERTS)) |
| 182 | { |
| 183 | if (!PKCS7_add_certificate(p7, signcert)) |
| 184 | goto err; |
| 185 | } |
| 186 | |
| 187 | if(!(flags & PKCS7_NOATTR)) |
| 188 | { |
| 189 | if (!PKCS7_add_attrib_content_type(si, NULL)) |
| 190 | goto err; |
| 191 | /* Add SMIMECapabilities */ |
| 192 | if(!(flags & PKCS7_NOSMIMECAP)) |
| 193 | { |
| 194 | if(!(smcap = sk_X509_ALGOR_new_null())) |
| 195 | { |
| 196 | PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, |
| 197 | ERR_R_MALLOC_FAILURE); |
| 198 | goto err; |
| 199 | } |
| 200 | if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1) |
| 201 | || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1) |
| 202 | || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1) |
| 203 | || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1) |
| 204 | || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1) |
| 205 | || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1) |
| 206 | || !add_cipher_smcap(smcap, NID_rc2_cbc, 128) |
| 207 | || !add_cipher_smcap(smcap, NID_rc2_cbc, 64) |
| 208 | || !add_cipher_smcap(smcap, NID_des_cbc, -1) |
| 209 | || !add_cipher_smcap(smcap, NID_rc2_cbc, 40) |
| 210 | || !PKCS7_add_attrib_smimecap (si, smcap)) |
| 211 | goto err; |
| 212 | sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); |
| 213 | smcap = NULL; |
| 214 | } |
| 215 | if (flags & PKCS7_REUSE_DIGEST) |
| 216 | { |
| 217 | if (!pkcs7_copy_existing_digest(p7, si)) |
| 218 | goto err; |
| 219 | if (!(flags & PKCS7_PARTIAL) && |
| 220 | !PKCS7_SIGNER_INFO_sign(si)) |
| 221 | goto err; |
| 222 | } |
| 223 | } |
| 224 | return si; |
| 225 | err: |
| 226 | if (smcap) |
| 227 | sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); |
| 228 | return NULL; |
| 229 | } |
| 230 | |
| 231 | /* Search for a digest matching SignerInfo digest type and if found |
| 232 | * copy across. |
| 233 | */ |
| 234 | |
| 235 | static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si) |
| 236 | { |
| 237 | int i; |
| 238 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos; |
| 239 | PKCS7_SIGNER_INFO *sitmp; |
| 240 | ASN1_OCTET_STRING *osdig = NULL; |
| 241 | sinfos = PKCS7_get_signer_info(p7); |
| 242 | for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) |
| 243 | { |
| 244 | sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i); |
| 245 | if (si == sitmp) |
| 246 | break; |
| 247 | if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0) |
| 248 | continue; |
| 249 | if (!OBJ_cmp(si->digest_alg->algorithm, |
| 250 | sitmp->digest_alg->algorithm)) |
| 251 | { |
| 252 | osdig = PKCS7_digest_from_attributes(sitmp->auth_attr); |
| 253 | break; |
| 254 | } |
| 255 | |
| 256 | } |
| 257 | |
| 258 | if (osdig) |
| 259 | return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length); |
| 260 | |
| 261 | PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST, |
| 262 | PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND); |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, |
| 267 | BIO *indata, BIO *out, int flags) |
| 268 | { |
| 269 | STACK_OF(X509) *signers; |
| 270 | X509 *signer; |
| 271 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos; |
| 272 | PKCS7_SIGNER_INFO *si; |
| 273 | X509_STORE_CTX cert_ctx; |
| 274 | char buf[4096]; |
| 275 | int i, j=0, k, ret = 0; |
| 276 | BIO *p7bio; |
| 277 | BIO *tmpin, *tmpout; |
| 278 | |
| 279 | if(!p7) { |
| 280 | PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER); |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | if(!PKCS7_type_is_signed(p7)) { |
| 285 | PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE); |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | /* Check for no data and no content: no data to verify signature */ |
| 290 | if(PKCS7_get_detached(p7) && !indata) { |
| 291 | PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT); |
| 292 | return 0; |
| 293 | } |
| 294 | #if 0 |
| 295 | /* NB: this test commented out because some versions of Netscape |
| 296 | * illegally include zero length content when signing data. |
| 297 | */ |
| 298 | |
| 299 | /* Check for data and content: two sets of data */ |
| 300 | if(!PKCS7_get_detached(p7) && indata) { |
| 301 | PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT); |
| 302 | return 0; |
| 303 | } |
| 304 | #endif |
| 305 | |
| 306 | sinfos = PKCS7_get_signer_info(p7); |
| 307 | |
| 308 | if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) { |
| 309 | PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA); |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | |
| 314 | signers = PKCS7_get0_signers(p7, certs, flags); |
| 315 | |
| 316 | if(!signers) return 0; |
| 317 | |
| 318 | /* Now verify the certificates */ |
| 319 | |
| 320 | if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) { |
| 321 | signer = sk_X509_value (signers, k); |
| 322 | if (!(flags & PKCS7_NOCHAIN)) { |
| 323 | if(!X509_STORE_CTX_init(&cert_ctx, store, signer, |
| 324 | p7->d.sign->cert)) |
| 325 | { |
| 326 | PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB); |
| 327 | sk_X509_free(signers); |
| 328 | return 0; |
| 329 | } |
| 330 | X509_STORE_CTX_set_default(&cert_ctx, "smime_sign"); |
| 331 | } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) { |
| 332 | PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB); |
| 333 | sk_X509_free(signers); |
| 334 | return 0; |
| 335 | } |
| 336 | if (!(flags & PKCS7_NOCRL)) |
| 337 | X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl); |
| 338 | i = X509_verify_cert(&cert_ctx); |
| 339 | if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx); |
| 340 | X509_STORE_CTX_cleanup(&cert_ctx); |
| 341 | if (i <= 0) { |
| 342 | PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR); |
| 343 | ERR_add_error_data(2, "Verify error:", |
| 344 | X509_verify_cert_error_string(j)); |
| 345 | sk_X509_free(signers); |
| 346 | return 0; |
| 347 | } |
| 348 | /* Check for revocation status here */ |
| 349 | } |
| 350 | |
| 351 | /* Performance optimization: if the content is a memory BIO then |
| 352 | * store its contents in a temporary read only memory BIO. This |
| 353 | * avoids potentially large numbers of slow copies of data which will |
| 354 | * occur when reading from a read write memory BIO when signatures |
| 355 | * are calculated. |
| 356 | */ |
| 357 | |
| 358 | if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) |
| 359 | { |
| 360 | char *ptr; |
| 361 | long len; |
| 362 | len = BIO_get_mem_data(indata, &ptr); |
| 363 | tmpin = BIO_new_mem_buf(ptr, len); |
| 364 | if (tmpin == NULL) |
| 365 | { |
| 366 | PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE); |
| 367 | return 0; |
| 368 | } |
| 369 | } |
| 370 | else |
| 371 | tmpin = indata; |
| 372 | |
| 373 | |
| 374 | if (!(p7bio=PKCS7_dataInit(p7,tmpin))) |
| 375 | goto err; |
| 376 | |
| 377 | if(flags & PKCS7_TEXT) { |
| 378 | if(!(tmpout = BIO_new(BIO_s_mem()))) { |
| 379 | PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE); |
| 380 | goto err; |
| 381 | } |
| 382 | BIO_set_mem_eof_return(tmpout, 0); |
| 383 | } else tmpout = out; |
| 384 | |
| 385 | /* We now have to 'read' from p7bio to calculate digests etc. */ |
| 386 | for (;;) |
| 387 | { |
| 388 | i=BIO_read(p7bio,buf,sizeof(buf)); |
| 389 | if (i <= 0) break; |
| 390 | if (tmpout) BIO_write(tmpout, buf, i); |
| 391 | } |
| 392 | |
| 393 | if(flags & PKCS7_TEXT) { |
| 394 | if(!SMIME_text(tmpout, out)) { |
| 395 | PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR); |
| 396 | BIO_free(tmpout); |
| 397 | goto err; |
| 398 | } |
| 399 | BIO_free(tmpout); |
| 400 | } |
| 401 | |
| 402 | /* Now Verify All Signatures */ |
| 403 | if (!(flags & PKCS7_NOSIGS)) |
| 404 | for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++) |
| 405 | { |
| 406 | si=sk_PKCS7_SIGNER_INFO_value(sinfos,i); |
| 407 | signer = sk_X509_value (signers, i); |
| 408 | j=PKCS7_signatureVerify(p7bio,p7,si, signer); |
| 409 | if (j <= 0) { |
| 410 | PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE); |
| 411 | goto err; |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | ret = 1; |
| 416 | |
| 417 | err: |
| 418 | |
| 419 | if (tmpin == indata) |
| 420 | { |
| 421 | if (indata) BIO_pop(p7bio); |
| 422 | } |
| 423 | BIO_free_all(p7bio); |
| 424 | |
| 425 | sk_X509_free(signers); |
| 426 | |
| 427 | return ret; |
| 428 | } |
| 429 | |
| 430 | STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags) |
| 431 | { |
| 432 | STACK_OF(X509) *signers; |
| 433 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos; |
| 434 | PKCS7_SIGNER_INFO *si; |
| 435 | PKCS7_ISSUER_AND_SERIAL *ias; |
| 436 | X509 *signer; |
| 437 | int i; |
| 438 | |
| 439 | if(!p7) { |
| 440 | PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER); |
| 441 | return NULL; |
| 442 | } |
| 443 | |
| 444 | if(!PKCS7_type_is_signed(p7)) { |
| 445 | PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE); |
| 446 | return NULL; |
| 447 | } |
| 448 | |
| 449 | /* Collect all the signers together */ |
| 450 | |
| 451 | sinfos = PKCS7_get_signer_info(p7); |
| 452 | |
| 453 | if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) { |
| 454 | PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS); |
| 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | if(!(signers = sk_X509_new_null())) { |
| 459 | PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE); |
| 460 | return NULL; |
| 461 | } |
| 462 | |
| 463 | for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) |
| 464 | { |
| 465 | si = sk_PKCS7_SIGNER_INFO_value(sinfos, i); |
| 466 | ias = si->issuer_and_serial; |
| 467 | signer = NULL; |
| 468 | /* If any certificates passed they take priority */ |
| 469 | if (certs) signer = X509_find_by_issuer_and_serial (certs, |
| 470 | ias->issuer, ias->serial); |
| 471 | if (!signer && !(flags & PKCS7_NOINTERN) |
| 472 | && p7->d.sign->cert) signer = |
| 473 | X509_find_by_issuer_and_serial (p7->d.sign->cert, |
| 474 | ias->issuer, ias->serial); |
| 475 | if (!signer) { |
| 476 | PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND); |
| 477 | sk_X509_free(signers); |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | if (!sk_X509_push(signers, signer)) { |
| 482 | sk_X509_free(signers); |
| 483 | return NULL; |
| 484 | } |
| 485 | } |
| 486 | return signers; |
| 487 | } |
| 488 | |
| 489 | |
| 490 | /* Build a complete PKCS#7 enveloped data */ |
| 491 | |
| 492 | PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, |
| 493 | int flags) |
| 494 | { |
| 495 | PKCS7 *p7; |
| 496 | BIO *p7bio = NULL; |
| 497 | int i; |
| 498 | X509 *x509; |
| 499 | if(!(p7 = PKCS7_new())) { |
| 500 | PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE); |
| 501 | return NULL; |
| 502 | } |
| 503 | |
| 504 | if (!PKCS7_set_type(p7, NID_pkcs7_enveloped)) |
| 505 | goto err; |
| 506 | if (!PKCS7_set_cipher(p7, cipher)) { |
| 507 | PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER); |
| 508 | goto err; |
| 509 | } |
| 510 | |
| 511 | for(i = 0; i < sk_X509_num(certs); i++) { |
| 512 | x509 = sk_X509_value(certs, i); |
| 513 | if(!PKCS7_add_recipient(p7, x509)) { |
| 514 | PKCS7err(PKCS7_F_PKCS7_ENCRYPT, |
| 515 | PKCS7_R_ERROR_ADDING_RECIPIENT); |
| 516 | goto err; |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | if (flags & PKCS7_STREAM) |
| 521 | return p7; |
| 522 | |
| 523 | if (PKCS7_final(p7, in, flags)) |
| 524 | return p7; |
| 525 | |
| 526 | err: |
| 527 | |
| 528 | BIO_free_all(p7bio); |
| 529 | PKCS7_free(p7); |
| 530 | return NULL; |
| 531 | |
| 532 | } |
| 533 | |
| 534 | int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags) |
| 535 | { |
| 536 | BIO *tmpmem; |
| 537 | int ret, i; |
| 538 | char buf[4096]; |
| 539 | |
| 540 | if(!p7) { |
| 541 | PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER); |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | if(!PKCS7_type_is_enveloped(p7)) { |
| 546 | PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE); |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | if(cert && !X509_check_private_key(cert, pkey)) { |
| 551 | PKCS7err(PKCS7_F_PKCS7_DECRYPT, |
| 552 | PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) { |
| 557 | PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR); |
| 558 | return 0; |
| 559 | } |
| 560 | |
| 561 | if (flags & PKCS7_TEXT) { |
| 562 | BIO *tmpbuf, *bread; |
| 563 | /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */ |
| 564 | if(!(tmpbuf = BIO_new(BIO_f_buffer()))) { |
| 565 | PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE); |
| 566 | BIO_free_all(tmpmem); |
| 567 | return 0; |
| 568 | } |
| 569 | if(!(bread = BIO_push(tmpbuf, tmpmem))) { |
| 570 | PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE); |
| 571 | BIO_free_all(tmpbuf); |
| 572 | BIO_free_all(tmpmem); |
| 573 | return 0; |
| 574 | } |
| 575 | ret = SMIME_text(bread, data); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 576 | BIO_free_all(bread); |
| 577 | return ret; |
| 578 | } else { |
| 579 | for(;;) { |
| 580 | i = BIO_read(tmpmem, buf, sizeof(buf)); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 581 | if(i <= 0) break; |
| 582 | BIO_write(data, buf, i); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 583 | } |
| 584 | BIO_free_all(tmpmem); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 585 | return 1; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 586 | } |
| 587 | } |