1/* pk7_smime.c */ 2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL 3 * project 1999. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1999-2003 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 66PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, 67 BIO *data, int flags) 68{ 69 PKCS7 *p7; 70 PKCS7_SIGNER_INFO *si; 71 BIO *p7bio; 72 STACK_OF(X509_ALGOR) *smcap; 73 int i; 74 75 if(!X509_check_private_key(signcert, pkey)) { 76 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 77 return NULL; 78 } 79 80 if(!(p7 = PKCS7_new())) { 81 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE); 82 return NULL; 83 } 84 85 PKCS7_set_type(p7, NID_pkcs7_signed); 86 87 PKCS7_content_new(p7, NID_pkcs7_data); 88 89 if (!(si = PKCS7_add_signature(p7,signcert,pkey,EVP_sha1()))) { 90 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR); 91 return NULL; 92 } 93 94 if(!(flags & PKCS7_NOCERTS)) { 95 PKCS7_add_certificate(p7, signcert); 96 if(certs) for(i = 0; i < sk_X509_num(certs); i++) 97 PKCS7_add_certificate(p7, sk_X509_value(certs, i)); 98 } 99 100 if(!(p7bio = PKCS7_dataInit(p7, NULL))) { 101 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE); 102 return NULL; 103 } 104 105 106 SMIME_crlf_copy(data, p7bio, flags); 107 108 if(!(flags & PKCS7_NOATTR)) { 109 PKCS7_add_signed_attribute(si, NID_pkcs9_contentType, 110 V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data)); 111 /* Add SMIMECapabilities */ 112 if(!(flags & PKCS7_NOSMIMECAP)) 113 { 114 if(!(smcap = sk_X509_ALGOR_new_null())) { 115 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE); 116 return NULL; 117 } 118#ifndef OPENSSL_NO_DES 119 PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1); 120#endif 121#ifndef OPENSSL_NO_RC2 122 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128); 123 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64); 124#endif 125#ifndef OPENSSL_NO_DES 126 PKCS7_simple_smimecap (smcap, NID_des_cbc, -1); 127#endif 128#ifndef OPENSSL_NO_RC2 129 PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40); 130#endif 131 PKCS7_add_attrib_smimecap (si, smcap); 132 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free); 133 } 134 } 135 136 if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1); 137 138 if (!PKCS7_dataFinal(p7,p7bio)) { 139 PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN); 140 return NULL; 141 } 142 143 BIO_free_all(p7bio); 144 return p7; 145} 146 147int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, 148 BIO *indata, BIO *out, int flags) 149{ 150 STACK_OF(X509) *signers; 151 X509 *signer; 152 STACK_OF(PKCS7_SIGNER_INFO) *sinfos; 153 PKCS7_SIGNER_INFO *si; 154 X509_STORE_CTX cert_ctx; 155 char buf[4096]; 156 int i, j=0, k, ret = 0; 157 BIO *p7bio; 158 BIO *tmpin, *tmpout; 159 160 if(!p7) { 161 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_INVALID_NULL_POINTER); 162 return 0; 163 } 164 165 if(!PKCS7_type_is_signed(p7)) { 166 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_WRONG_CONTENT_TYPE); 167 return 0; 168 } 169 170 /* Check for no data and no content: no data to verify signature */ 171 if(PKCS7_get_detached(p7) && !indata) { 172 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_CONTENT); 173 return 0; 174 } 175#if 0 176 /* NB: this test commented out because some versions of Netscape 177 * illegally include zero length content when signing data. 178 */ 179 180 /* Check for data and content: two sets of data */ 181 if(!PKCS7_get_detached(p7) && indata) { 182 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CONTENT_AND_DATA_PRESENT); 183 return 0; 184 } 185#endif 186 187 sinfos = PKCS7_get_signer_info(p7); 188 189 if(!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) { 190 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_NO_SIGNATURES_ON_DATA); 191 return 0; 192 } 193 194 195 signers = PKCS7_get0_signers(p7, certs, flags); 196 197 if(!signers) return 0; 198 199 /* Now verify the certificates */ 200 201 if (!(flags & PKCS7_NOVERIFY)) for (k = 0; k < sk_X509_num(signers); k++) { 202 signer = sk_X509_value (signers, k); 203 if (!(flags & PKCS7_NOCHAIN)) { 204 if(!X509_STORE_CTX_init(&cert_ctx, store, signer, 205 p7->d.sign->cert)) 206 { 207 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB); 208 sk_X509_free(signers); 209 return 0; 210 } 211 X509_STORE_CTX_set_purpose(&cert_ctx, 212 X509_PURPOSE_SMIME_SIGN); 213 } else if(!X509_STORE_CTX_init (&cert_ctx, store, signer, NULL)) { 214 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_X509_LIB); 215 sk_X509_free(signers); 216 return 0; 217 } 218 i = X509_verify_cert(&cert_ctx); 219 if (i <= 0) j = X509_STORE_CTX_get_error(&cert_ctx); 220 X509_STORE_CTX_cleanup(&cert_ctx); 221 if (i <= 0) { 222 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_CERTIFICATE_VERIFY_ERROR); 223 ERR_add_error_data(2, "Verify error:", 224 X509_verify_cert_error_string(j)); 225 sk_X509_free(signers); 226 return 0; 227 } 228 /* Check for revocation status here */ 229 } 230 231 /* Performance optimization: if the content is a memory BIO then 232 * store its contents in a temporary read only memory BIO. This 233 * avoids potentially large numbers of slow copies of data which will 234 * occur when reading from a read write memory BIO when signatures 235 * are calculated. 236 */ 237 238 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) 239 { 240 char *ptr; 241 long len; 242 len = BIO_get_mem_data(indata, &ptr); 243 tmpin = BIO_new_mem_buf(ptr, len); 244 if (tmpin == NULL) 245 { 246 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE); 247 return 0; 248 } 249 } 250 else 251 tmpin = indata; 252 253 254 p7bio=PKCS7_dataInit(p7,tmpin); 255 256 if(flags & PKCS7_TEXT) { 257 if(!(tmpout = BIO_new(BIO_s_mem()))) { 258 PKCS7err(PKCS7_F_PKCS7_VERIFY,ERR_R_MALLOC_FAILURE); 259 goto err; 260 } 261 } else tmpout = out; 262 263 /* We now have to 'read' from p7bio to calculate digests etc. */ 264 for (;;) 265 { 266 i=BIO_read(p7bio,buf,sizeof(buf)); 267 if (i <= 0) break; 268 if (tmpout) BIO_write(tmpout, buf, i); 269 } 270 271 if(flags & PKCS7_TEXT) { 272 if(!SMIME_text(tmpout, out)) { 273 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SMIME_TEXT_ERROR); 274 BIO_free(tmpout); 275 goto err; 276 } 277 BIO_free(tmpout); 278 } 279 280 /* Now Verify All Signatures */ 281 if (!(flags & PKCS7_NOSIGS)) 282 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sinfos); i++) 283 { 284 si=sk_PKCS7_SIGNER_INFO_value(sinfos,i); 285 signer = sk_X509_value (signers, i); 286 j=PKCS7_signatureVerify(p7bio,p7,si, signer); 287 if (j <= 0) { 288 PKCS7err(PKCS7_F_PKCS7_VERIFY,PKCS7_R_SIGNATURE_FAILURE); 289 goto err; 290 } 291 } 292 293 ret = 1; 294 295 err: 296 297 if (tmpin == indata) 298 { 299 if(indata) BIO_pop(p7bio); 300 BIO_free_all(p7bio); 301 } 302 else 303 BIO_free_all(tmpin); 304 305 sk_X509_free(signers); 306 307 return ret; 308} 309 310STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags) 311{ 312 STACK_OF(X509) *signers; 313 STACK_OF(PKCS7_SIGNER_INFO) *sinfos; 314 PKCS7_SIGNER_INFO *si; 315 PKCS7_ISSUER_AND_SERIAL *ias; 316 X509 *signer; 317 int i; 318 319 if(!p7) { 320 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_INVALID_NULL_POINTER); 321 return NULL; 322 } 323 324 if(!PKCS7_type_is_signed(p7)) { 325 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE); 326 return NULL; 327 } 328 329 /* Collect all the signers together */ 330 331 sinfos = PKCS7_get_signer_info(p7); 332 333 if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) { 334 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS); 335 return 0; 336 } 337 338 if(!(signers = sk_X509_new_null())) { 339 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE); 340 return NULL; 341 } 342 343 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) 344 { 345 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i); 346 ias = si->issuer_and_serial; 347 signer = NULL; 348 /* If any certificates passed they take priority */ 349 if (certs) signer = X509_find_by_issuer_and_serial (certs, 350 ias->issuer, ias->serial); 351 if (!signer && !(flags & PKCS7_NOINTERN) 352 && p7->d.sign->cert) signer = 353 X509_find_by_issuer_and_serial (p7->d.sign->cert, 354 ias->issuer, ias->serial); 355 if (!signer) { 356 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND); 357 sk_X509_free(signers); 358 return 0; 359 } 360 361 sk_X509_push(signers, signer); 362 } 363 return signers; 364} 365 366 367/* Build a complete PKCS#7 enveloped data */ 368 369PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, 370 int flags) 371{ 372 PKCS7 *p7; 373 BIO *p7bio = NULL; 374 int i; 375 X509 *x509; 376 if(!(p7 = PKCS7_new())) { 377 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE); 378 return NULL; 379 } 380 381 PKCS7_set_type(p7, NID_pkcs7_enveloped); 382 if(!PKCS7_set_cipher(p7, cipher)) { 383 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER); 384 goto err; 385 } 386 387 for(i = 0; i < sk_X509_num(certs); i++) { 388 x509 = sk_X509_value(certs, i); 389 if(!PKCS7_add_recipient(p7, x509)) { 390 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, 391 PKCS7_R_ERROR_ADDING_RECIPIENT); 392 goto err; 393 } 394 } 395 396 if(!(p7bio = PKCS7_dataInit(p7, NULL))) { 397 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE); 398 goto err; 399 } 400 401 SMIME_crlf_copy(in, p7bio, flags); 402 403 BIO_flush(p7bio); 404 405 if (!PKCS7_dataFinal(p7,p7bio)) { 406 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR); 407 goto err; 408 } 409 BIO_free_all(p7bio); 410 411 return p7; 412 413 err: 414 415 BIO_free(p7bio); 416 PKCS7_free(p7); 417 return NULL; 418 419} 420 421int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags) 422{ 423 BIO *tmpmem; 424 int ret, i; 425 char buf[4096]; 426 427 if(!p7) { 428 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_INVALID_NULL_POINTER); 429 return 0; 430 } 431 432 if(!PKCS7_type_is_enveloped(p7)) { 433 PKCS7err(PKCS7_F_PKCS7_DECRYPT,PKCS7_R_WRONG_CONTENT_TYPE); 434 return 0; 435 } 436 437 if(!X509_check_private_key(cert, pkey)) { 438 PKCS7err(PKCS7_F_PKCS7_DECRYPT, 439 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE); 440 return 0; 441 } 442 443 if(!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) { 444 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR); 445 return 0; 446 } 447 448 if (flags & PKCS7_TEXT) { 449 BIO *tmpbuf, *bread; 450 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */ 451 if(!(tmpbuf = BIO_new(BIO_f_buffer()))) { 452 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE); 453 return 0; 454 } 455 if(!(bread = BIO_push(tmpbuf, tmpmem))) { 456 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE); 457 return 0; 458 } 459 ret = SMIME_text(bread, data); 460 BIO_free_all(bread); 461 return ret; 462 } else { 463 for(;;) { 464 i = BIO_read(tmpmem, buf, sizeof(buf)); 465 if(i <= 0) break; 466 BIO_write(data, buf, i); 467 } 468 BIO_free_all(tmpmem); 469 return 1; 470 } 471} 472