1 /* crypto/pkcs7/pk7_doit.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 #include "cryptlib.h" 61 #include <openssl/rand.h> 62 #include <openssl/objects.h> 63 #include <openssl/x509.h> 64 #include <openssl/x509v3.h> 65 66 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype, 67 void *value); 68 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid); 69 70 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio) 71 { 72 int i,j; 73 BIO *out=NULL,*btmp=NULL; 74 X509_ALGOR *xa; 75 const EVP_MD *evp_md; 76 const EVP_CIPHER *evp_cipher=NULL; 77 STACK_OF(X509_ALGOR) *md_sk=NULL; 78 STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL; 79 X509_ALGOR *xalg=NULL; 80 PKCS7_RECIP_INFO *ri=NULL; 81 EVP_PKEY *pkey; 82 83 i=OBJ_obj2nid(p7->type); 84 p7->state=PKCS7_S_HEADER; 85 86 switch (i) 87 { 88 case NID_pkcs7_signed: 89 md_sk=p7->d.sign->md_algs; 90 break; 91 case NID_pkcs7_signedAndEnveloped: 92 rsk=p7->d.signed_and_enveloped->recipientinfo; 93 md_sk=p7->d.signed_and_enveloped->md_algs; 94 xalg=p7->d.signed_and_enveloped->enc_data->algorithm; 95 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher; 96 if (evp_cipher == NULL) 97 { 98 PKCS7err(PKCS7_F_PKCS7_DATAINIT, 99 PKCS7_R_CIPHER_NOT_INITIALIZED); 100 goto err; 101 } 102 break; 103 case NID_pkcs7_enveloped: 104 rsk=p7->d.enveloped->recipientinfo; 105 xalg=p7->d.enveloped->enc_data->algorithm; 106 evp_cipher=p7->d.enveloped->enc_data->cipher; 107 if (evp_cipher == NULL) 108 { 109 PKCS7err(PKCS7_F_PKCS7_DATAINIT, 110 PKCS7_R_CIPHER_NOT_INITIALIZED); 111 goto err; 112 } 113 break; 114 default: 115 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE); 116 goto err; 117 } 118 119 if (md_sk != NULL) 120 { 121 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++) 122 { 123 xa=sk_X509_ALGOR_value(md_sk,i); 124 if ((btmp=BIO_new(BIO_f_md())) == NULL) 125 { 126 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB); 127 goto err; 128 } 129 130 j=OBJ_obj2nid(xa->algorithm); 131 evp_md=EVP_get_digestbyname(OBJ_nid2sn(j)); 132 if (evp_md == NULL) 133 { 134 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE); 135 goto err; 136 } 137 138 BIO_set_md(btmp,evp_md); 139 if (out == NULL) 140 out=btmp; 141 else 142 BIO_push(out,btmp); 143 btmp=NULL; 144 } 145 } 146 147 if (evp_cipher != NULL) 148 { 149 unsigned char key[EVP_MAX_KEY_LENGTH]; 150 unsigned char iv[EVP_MAX_IV_LENGTH]; 151 int keylen,ivlen; 152 int jj,max; 153 unsigned char *tmp; 154 EVP_CIPHER_CTX *ctx; 155 156 if ((btmp=BIO_new(BIO_f_cipher())) == NULL) 157 { 158 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB); 159 goto err; 160 } 161 BIO_get_cipher_ctx(btmp, &ctx); 162 keylen=EVP_CIPHER_key_length(evp_cipher); 163 ivlen=EVP_CIPHER_iv_length(evp_cipher); 164 if (RAND_bytes(key,keylen) <= 0) 165 goto err; 166 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher)); 167 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen); 168 EVP_CipherInit(ctx, evp_cipher, key, iv, 1); 169 170 if (ivlen > 0) { 171 if (xalg->parameter == NULL) 172 xalg->parameter=ASN1_TYPE_new(); 173 if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0) 174 goto err; 175 } 176 177 /* Lets do the pub key stuff :-) */ 178 max=0; 179 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) 180 { 181 ri=sk_PKCS7_RECIP_INFO_value(rsk,i); 182 if (ri->cert == NULL) 183 { 184 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO); 185 goto err; 186 } 187 pkey=X509_get_pubkey(ri->cert); 188 jj=EVP_PKEY_size(pkey); 189 EVP_PKEY_free(pkey); 190 if (max < jj) max=jj; 191 } 192 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL) 193 { 194 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE); 195 goto err; 196 } 197 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) 198 { 199 ri=sk_PKCS7_RECIP_INFO_value(rsk,i); 200 pkey=X509_get_pubkey(ri->cert); 201 jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey); 202 EVP_PKEY_free(pkey); 203 if (jj <= 0) 204 { 205 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB); 206 OPENSSL_free(tmp); 207 goto err; 208 } 209 M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj); 210 } 211 OPENSSL_free(tmp); 212 memset(key, 0, keylen); 213 214 if (out == NULL) 215 out=btmp; 216 else 217 BIO_push(out,btmp); 218 btmp=NULL; 219 } 220 221 if (bio == NULL) { 222 if (p7->detached) 223 bio=BIO_new(BIO_s_null()); 224 else { 225 if (PKCS7_type_is_signed(p7) && 226 PKCS7_type_is_data(p7->d.sign->contents)) { 227 ASN1_OCTET_STRING *os; 228 os=p7->d.sign->contents->d.data; 229 if (os->length > 0) bio = 230 BIO_new_mem_buf(os->data, os->length); 231 } 232 if(bio == NULL) { 233 bio=BIO_new(BIO_s_mem()); 234 BIO_set_mem_eof_return(bio,0); 235 } 236 } 237 } 238 BIO_push(out,bio); 239 bio=NULL; 240 if (0) 241 { 242 err: 243 if (out != NULL) 244 BIO_free_all(out); 245 if (btmp != NULL) 246 BIO_free_all(btmp); 247 out=NULL; 248 } 249 return(out); 250 } 251 252 /* int */ 253 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert) 254 { 255 int i,j; 256 BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL; 257 unsigned char *tmp=NULL; 258 X509_ALGOR *xa; 259 ASN1_OCTET_STRING *data_body=NULL; 260 const EVP_MD *evp_md; 261 const EVP_CIPHER *evp_cipher=NULL; 262 EVP_CIPHER_CTX *evp_ctx=NULL; 263 X509_ALGOR *enc_alg=NULL; 264 STACK_OF(X509_ALGOR) *md_sk=NULL; 265 STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL; 266 X509_ALGOR *xalg=NULL; 267 PKCS7_RECIP_INFO *ri=NULL; 268 269 i=OBJ_obj2nid(p7->type); 270 p7->state=PKCS7_S_HEADER; 271 272 switch (i) 273 { 274 case NID_pkcs7_signed: 275 data_body=p7->d.sign->contents->d.data; 276 md_sk=p7->d.sign->md_algs; 277 break; 278 case NID_pkcs7_signedAndEnveloped: 279 rsk=p7->d.signed_and_enveloped->recipientinfo; 280 md_sk=p7->d.signed_and_enveloped->md_algs; 281 data_body=p7->d.signed_and_enveloped->enc_data->enc_data; 282 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm; 283 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm))); 284 if (evp_cipher == NULL) 285 { 286 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE); 287 goto err; 288 } 289 xalg=p7->d.signed_and_enveloped->enc_data->algorithm; 290 break; 291 case NID_pkcs7_enveloped: 292 rsk=p7->d.enveloped->recipientinfo; 293 enc_alg=p7->d.enveloped->enc_data->algorithm; 294 data_body=p7->d.enveloped->enc_data->enc_data; 295 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm))); 296 if (evp_cipher == NULL) 297 { 298 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE); 299 goto err; 300 } 301 xalg=p7->d.enveloped->enc_data->algorithm; 302 break; 303 default: 304 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE); 305 goto err; 306 } 307 308 /* We will be checking the signature */ 309 if (md_sk != NULL) 310 { 311 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++) 312 { 313 xa=sk_X509_ALGOR_value(md_sk,i); 314 if ((btmp=BIO_new(BIO_f_md())) == NULL) 315 { 316 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB); 317 goto err; 318 } 319 320 j=OBJ_obj2nid(xa->algorithm); 321 evp_md=EVP_get_digestbyname(OBJ_nid2sn(j)); 322 if (evp_md == NULL) 323 { 324 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE); 325 goto err; 326 } 327 328 BIO_set_md(btmp,evp_md); 329 if (out == NULL) 330 out=btmp; 331 else 332 BIO_push(out,btmp); 333 btmp=NULL; 334 } 335 } 336 337 if (evp_cipher != NULL) 338 { 339 #if 0 340 unsigned char key[EVP_MAX_KEY_LENGTH]; 341 unsigned char iv[EVP_MAX_IV_LENGTH]; 342 unsigned char *p; 343 int keylen,ivlen; 344 int max; 345 X509_OBJECT ret; 346 #endif 347 int jj; 348 349 if ((etmp=BIO_new(BIO_f_cipher())) == NULL) 350 { 351 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB); 352 goto err; 353 } 354 355 /* It was encrypted, we need to decrypt the secret key 356 * with the private key */ 357 358 /* Find the recipientInfo which matches the passed certificate 359 * (if any) 360 */ 361 362 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) { 363 ri=sk_PKCS7_RECIP_INFO_value(rsk,i); 364 if(!X509_NAME_cmp(ri->issuer_and_serial->issuer, 365 pcert->cert_info->issuer) && 366 !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber, 367 ri->issuer_and_serial->serial)) break; 368 ri=NULL; 369 } 370 if (ri == NULL) { 371 PKCS7err(PKCS7_F_PKCS7_DATADECODE, 372 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE); 373 goto err; 374 } 375 376 jj=EVP_PKEY_size(pkey); 377 tmp=(unsigned char *)OPENSSL_malloc(jj+10); 378 if (tmp == NULL) 379 { 380 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE); 381 goto err; 382 } 383 384 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key), 385 M_ASN1_STRING_length(ri->enc_key), pkey); 386 if (jj <= 0) 387 { 388 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB); 389 goto err; 390 } 391 392 evp_ctx=NULL; 393 BIO_get_cipher_ctx(etmp,&evp_ctx); 394 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0); 395 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0) 396 goto err; 397 398 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) { 399 /* Some S/MIME clients don't use the same key 400 * and effective key length. The key length is 401 * determined by the size of the decrypted RSA key. 402 */ 403 if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj)) 404 { 405 PKCS7err(PKCS7_F_PKCS7_DATADECODE, 406 PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH); 407 goto err; 408 } 409 } 410 EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0); 411 412 memset(tmp,0,jj); 413 414 if (out == NULL) 415 out=etmp; 416 else 417 BIO_push(out,etmp); 418 etmp=NULL; 419 } 420 421 #if 1 422 if (p7->detached || (in_bio != NULL)) 423 { 424 bio=in_bio; 425 } 426 else 427 { 428 #if 0 429 bio=BIO_new(BIO_s_mem()); 430 /* We need to set this so that when we have read all 431 * the data, the encrypt BIO, if present, will read 432 * EOF and encode the last few bytes */ 433 BIO_set_mem_eof_return(bio,0); 434 435 if (data_body->length > 0) 436 BIO_write(bio,(char *)data_body->data,data_body->length); 437 #else 438 if (data_body->length > 0) 439 bio = BIO_new_mem_buf(data_body->data,data_body->length); 440 else { 441 bio=BIO_new(BIO_s_mem()); 442 BIO_set_mem_eof_return(bio,0); 443 } 444 #endif 445 } 446 BIO_push(out,bio); 447 bio=NULL; 448 #endif 449 if (0) 450 { 451 err: 452 if (out != NULL) BIO_free_all(out); 453 if (btmp != NULL) BIO_free_all(btmp); 454 if (etmp != NULL) BIO_free_all(etmp); 455 if (bio != NULL) BIO_free_all(bio); 456 out=NULL; 457 } 458 if (tmp != NULL) 459 OPENSSL_free(tmp); 460 return(out); 461 } 462 463 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio) 464 { 465 int ret=0; 466 int i,j; 467 BIO *btmp; 468 BUF_MEM *buf_mem=NULL; 469 BUF_MEM *buf=NULL; 470 PKCS7_SIGNER_INFO *si; 471 EVP_MD_CTX *mdc,ctx_tmp; 472 STACK_OF(X509_ATTRIBUTE) *sk; 473 STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL; 474 unsigned char *p,*pp=NULL; 475 int x; 476 ASN1_OCTET_STRING *os=NULL; 477 478 i=OBJ_obj2nid(p7->type); 479 p7->state=PKCS7_S_HEADER; 480 481 switch (i) 482 { 483 case NID_pkcs7_signedAndEnveloped: 484 /* XXXXXXXXXXXXXXXX */ 485 si_sk=p7->d.signed_and_enveloped->signer_info; 486 os=M_ASN1_OCTET_STRING_new(); 487 p7->d.signed_and_enveloped->enc_data->enc_data=os; 488 break; 489 case NID_pkcs7_enveloped: 490 /* XXXXXXXXXXXXXXXX */ 491 os=M_ASN1_OCTET_STRING_new(); 492 p7->d.enveloped->enc_data->enc_data=os; 493 break; 494 case NID_pkcs7_signed: 495 si_sk=p7->d.sign->signer_info; 496 os=p7->d.sign->contents->d.data; 497 /* If detached data then the content is excluded */ 498 if(p7->detached) { 499 M_ASN1_OCTET_STRING_free(os); 500 p7->d.sign->contents->d.data = NULL; 501 } 502 break; 503 } 504 505 if (si_sk != NULL) 506 { 507 if ((buf=BUF_MEM_new()) == NULL) 508 { 509 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB); 510 goto err; 511 } 512 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++) 513 { 514 si=sk_PKCS7_SIGNER_INFO_value(si_sk,i); 515 if (si->pkey == NULL) continue; 516 517 j=OBJ_obj2nid(si->digest_alg->algorithm); 518 519 btmp=bio; 520 for (;;) 521 { 522 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) 523 == NULL) 524 { 525 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST); 526 goto err; 527 } 528 BIO_get_md_ctx(btmp,&mdc); 529 if (mdc == NULL) 530 { 531 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR); 532 goto err; 533 } 534 if (EVP_MD_CTX_type(mdc) == j) 535 break; 536 else 537 btmp=BIO_next(btmp); 538 } 539 540 /* We now have the EVP_MD_CTX, lets do the 541 * signing. */ 542 memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp)); 543 if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey))) 544 { 545 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB); 546 goto err; 547 } 548 549 sk=si->auth_attr; 550 551 /* If there are attributes, we add the digest 552 * attribute and only sign the attributes */ 553 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) 554 { 555 unsigned char md_data[EVP_MAX_MD_SIZE]; 556 unsigned int md_len; 557 ASN1_OCTET_STRING *digest; 558 ASN1_UTCTIME *sign_time; 559 const EVP_MD *md_tmp; 560 561 /* Add signing time */ 562 sign_time=X509_gmtime_adj(NULL,0); 563 PKCS7_add_signed_attribute(si, 564 NID_pkcs9_signingTime, 565 V_ASN1_UTCTIME,sign_time); 566 567 /* Add digest */ 568 md_tmp=EVP_MD_CTX_md(&ctx_tmp); 569 EVP_DigestFinal(&ctx_tmp,md_data,&md_len); 570 digest=M_ASN1_OCTET_STRING_new(); 571 M_ASN1_OCTET_STRING_set(digest,md_data,md_len); 572 PKCS7_add_signed_attribute(si, 573 NID_pkcs9_messageDigest, 574 V_ASN1_OCTET_STRING,digest); 575 576 /* Now sign the mess */ 577 EVP_SignInit(&ctx_tmp,md_tmp); 578 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL, 579 i2d_X509_ATTRIBUTE, 580 V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET); 581 pp=(unsigned char *)OPENSSL_malloc(x); 582 p=pp; 583 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p, 584 i2d_X509_ATTRIBUTE, 585 V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET); 586 EVP_SignUpdate(&ctx_tmp,pp,x); 587 OPENSSL_free(pp); 588 pp=NULL; 589 } 590 591 #ifndef NO_DSA 592 if (si->pkey->type == EVP_PKEY_DSA) 593 ctx_tmp.digest=EVP_dss1(); 594 #endif 595 596 if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data, 597 (unsigned int *)&buf->length,si->pkey)) 598 { 599 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB); 600 goto err; 601 } 602 if (!ASN1_STRING_set(si->enc_digest, 603 (unsigned char *)buf->data,buf->length)) 604 { 605 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB); 606 goto err; 607 } 608 } 609 } 610 611 if (!p7->detached) 612 { 613 btmp=BIO_find_type(bio,BIO_TYPE_MEM); 614 if (btmp == NULL) 615 { 616 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO); 617 goto err; 618 } 619 BIO_get_mem_ptr(btmp,&buf_mem); 620 /* Mark the BIO read only then we can use its copy of the data 621 * instead of making an extra copy. 622 */ 623 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY); 624 BIO_set_mem_eof_return(btmp, 0); 625 os->data = (unsigned char *)buf_mem->data; 626 os->length = buf_mem->length; 627 #if 0 628 M_ASN1_OCTET_STRING_set(os, 629 (unsigned char *)buf_mem->data,buf_mem->length); 630 #endif 631 } 632 if (pp != NULL) OPENSSL_free(pp); 633 pp=NULL; 634 635 ret=1; 636 err: 637 if (buf != NULL) BUF_MEM_free(buf); 638 return(ret); 639 } 640 641 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio, 642 PKCS7 *p7, PKCS7_SIGNER_INFO *si) 643 { 644 PKCS7_ISSUER_AND_SERIAL *ias; 645 int ret=0,i; 646 STACK_OF(X509) *cert; 647 X509 *x509; 648 649 if (PKCS7_type_is_signed(p7)) 650 { 651 cert=p7->d.sign->cert; 652 } 653 else if (PKCS7_type_is_signedAndEnveloped(p7)) 654 { 655 cert=p7->d.signed_and_enveloped->cert; 656 } 657 else 658 { 659 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE); 660 goto err; 661 } 662 /* XXXXXXXXXXXXXXXXXXXXXXX */ 663 ias=si->issuer_and_serial; 664 665 x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial); 666 667 /* were we able to find the cert in passed to us */ 668 if (x509 == NULL) 669 { 670 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE); 671 goto err; 672 } 673 674 /* Lets verify */ 675 X509_STORE_CTX_init(ctx,cert_store,x509,cert); 676 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN); 677 i=X509_verify_cert(ctx); 678 if (i <= 0) 679 { 680 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB); 681 X509_STORE_CTX_cleanup(ctx); 682 goto err; 683 } 684 X509_STORE_CTX_cleanup(ctx); 685 686 return PKCS7_signatureVerify(bio, p7, si, x509); 687 err: 688 return ret; 689 } 690 691 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si, 692 X509 *x509) 693 { 694 ASN1_OCTET_STRING *os; 695 EVP_MD_CTX mdc_tmp,*mdc; 696 unsigned char *pp,*p; 697 int ret=0,i; 698 int md_type; 699 STACK_OF(X509_ATTRIBUTE) *sk; 700 BIO *btmp; 701 EVP_PKEY *pkey; 702 703 if (!PKCS7_type_is_signed(p7) && 704 !PKCS7_type_is_signedAndEnveloped(p7)) { 705 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, 706 PKCS7_R_WRONG_PKCS7_TYPE); 707 goto err; 708 } 709 710 md_type=OBJ_obj2nid(si->digest_alg->algorithm); 711 712 btmp=bio; 713 for (;;) 714 { 715 if ((btmp == NULL) || 716 ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL)) 717 { 718 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, 719 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST); 720 goto err; 721 } 722 BIO_get_md_ctx(btmp,&mdc); 723 if (mdc == NULL) 724 { 725 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, 726 PKCS7_R_INTERNAL_ERROR); 727 goto err; 728 } 729 if (EVP_MD_CTX_type(mdc) == md_type) 730 break; 731 btmp=BIO_next(btmp); 732 } 733 734 /* mdc is the digest ctx that we want, unless there are attributes, 735 * in which case the digest is the signed attributes */ 736 memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp)); 737 738 sk=si->auth_attr; 739 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) 740 { 741 unsigned char md_dat[EVP_MAX_MD_SIZE]; 742 unsigned int md_len; 743 ASN1_OCTET_STRING *message_digest; 744 745 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len); 746 message_digest=PKCS7_digest_from_attributes(sk); 747 if (!message_digest) 748 { 749 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, 750 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST); 751 goto err; 752 } 753 if ((message_digest->length != (int)md_len) || 754 (memcmp(message_digest->data,md_dat,md_len))) 755 { 756 #if 0 757 { 758 int ii; 759 for (ii=0; ii<message_digest->length; ii++) 760 printf("%02X",message_digest->data[ii]); printf(" sent\n"); 761 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n"); 762 } 763 #endif 764 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, 765 PKCS7_R_DIGEST_FAILURE); 766 ret= -1; 767 goto err; 768 } 769 770 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type)); 771 /* Note: when forming the encoding of the attributes we 772 * shouldn't reorder them or this will break the signature. 773 * This is done by using the IS_SEQUENCE flag. 774 */ 775 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE, 776 V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE); 777 pp=OPENSSL_malloc(i); 778 p=pp; 779 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE, 780 V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE); 781 EVP_VerifyUpdate(&mdc_tmp,pp,i); 782 783 OPENSSL_free(pp); 784 } 785 786 os=si->enc_digest; 787 pkey = X509_get_pubkey(x509); 788 if (!pkey) 789 { 790 ret = -1; 791 goto err; 792 } 793 #ifndef NO_DSA 794 if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1(); 795 #endif 796 797 i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey); 798 EVP_PKEY_free(pkey); 799 if (i <= 0) 800 { 801 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, 802 PKCS7_R_SIGNATURE_FAILURE); 803 ret= -1; 804 goto err; 805 } 806 else 807 ret=1; 808 err: 809 return(ret); 810 } 811 812 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx) 813 { 814 STACK_OF(PKCS7_RECIP_INFO) *rsk; 815 PKCS7_RECIP_INFO *ri; 816 int i; 817 818 i=OBJ_obj2nid(p7->type); 819 if (i != NID_pkcs7_signedAndEnveloped) return(NULL); 820 rsk=p7->d.signed_and_enveloped->recipientinfo; 821 ri=sk_PKCS7_RECIP_INFO_value(rsk,0); 822 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL); 823 ri=sk_PKCS7_RECIP_INFO_value(rsk,idx); 824 return(ri->issuer_and_serial); 825 } 826 827 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid) 828 { 829 return(get_attribute(si->auth_attr,nid)); 830 } 831 832 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid) 833 { 834 return(get_attribute(si->unauth_attr,nid)); 835 } 836 837 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid) 838 { 839 int i; 840 X509_ATTRIBUTE *xa; 841 ASN1_OBJECT *o; 842 843 o=OBJ_nid2obj(nid); 844 if (!o || !sk) return(NULL); 845 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++) 846 { 847 xa=sk_X509_ATTRIBUTE_value(sk,i); 848 if (OBJ_cmp(xa->object,o) == 0) 849 { 850 if (xa->set && sk_ASN1_TYPE_num(xa->value.set)) 851 return(sk_ASN1_TYPE_value(xa->value.set,0)); 852 else 853 return(NULL); 854 } 855 } 856 return(NULL); 857 } 858 859 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk) 860 { 861 ASN1_TYPE *astype; 862 if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL; 863 return astype->value.octet_string; 864 } 865 866 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, 867 STACK_OF(X509_ATTRIBUTE) *sk) 868 { 869 int i; 870 871 if (p7si->auth_attr != NULL) 872 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free); 873 p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk); 874 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++) 875 { 876 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i, 877 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i)))) 878 == NULL) 879 return(0); 880 } 881 return(1); 882 } 883 884 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk) 885 { 886 int i; 887 888 if (p7si->unauth_attr != NULL) 889 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, 890 X509_ATTRIBUTE_free); 891 p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk); 892 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++) 893 { 894 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i, 895 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i)))) 896 == NULL) 897 return(0); 898 } 899 return(1); 900 } 901 902 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype, 903 void *value) 904 { 905 return(add_attribute(&(p7si->auth_attr),nid,atrtype,value)); 906 } 907 908 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype, 909 void *value) 910 { 911 return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value)); 912 } 913 914 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype, 915 void *value) 916 { 917 X509_ATTRIBUTE *attr=NULL; 918 919 if (*sk == NULL) 920 { 921 *sk = sk_X509_ATTRIBUTE_new_null(); 922 new_attrib: 923 attr=X509_ATTRIBUTE_create(nid,atrtype,value); 924 sk_X509_ATTRIBUTE_push(*sk,attr); 925 } 926 else 927 { 928 int i; 929 930 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++) 931 { 932 attr=sk_X509_ATTRIBUTE_value(*sk,i); 933 if (OBJ_obj2nid(attr->object) == nid) 934 { 935 X509_ATTRIBUTE_free(attr); 936 attr=X509_ATTRIBUTE_create(nid,atrtype,value); 937 sk_X509_ATTRIBUTE_set(*sk,i,attr); 938 goto end; 939 } 940 } 941 goto new_attrib; 942 } 943 end: 944 return(1); 945 } 946 947