crypto/pkcs7/pk7_doit.c

   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 #include <openssl/err.h>
  66
  67 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
  68                          void *value);
  69 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
  70
  71 static int PKCS7_type_is_other(PKCS7* p7)
  72         {
  73         int isOther=1;
  74
  75         int nid=OBJ_obj2nid(p7->type);
  76
  77         switch( nid )
  78                 {
  79         case NID_pkcs7_data:
  80         case NID_pkcs7_signed:
  81         case NID_pkcs7_enveloped:
  82         case NID_pkcs7_signedAndEnveloped:
  83         case NID_pkcs7_digest:
  84         case NID_pkcs7_encrypted:
  85                 isOther=0;
  86                 break;
  87         default:
  88                 isOther=1;
  89                 }
  90
  91         return isOther;
  92
  93         }
  94
  95 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
  96         {
  97         if ( PKCS7_type_is_data(p7))
  98                 return p7->d.data;
  99         if ( PKCS7_type_is_other(p7) && p7->d.other
 100                 && (p7->d.other->type == V_ASN1_OCTET_STRING))
 101                 return p7->d.other->value.octet_string;
 102         return NULL;
 103         }
 104
 105 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
 106         {
 107         BIO *btmp;
 108         const EVP_MD *md;
 109         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 110                 {
 111                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 112                 goto err;
 113                 }
 114
 115         md=EVP_get_digestbyobj(alg->algorithm);
 116         if (md == NULL)
 117                 {
 118                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 119                 goto err;
 120                 }
 121
 122         BIO_set_md(btmp,md);
 123         if (*pbio == NULL)
 124                 *pbio=btmp;
 125         else if (!BIO_push(*pbio,btmp))
 126                 {
 127                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 128                 goto err;
 129                 }
 130         btmp=NULL;
 131
 132         return 1;
 133
 134         err:
 135         if (btmp)
 136                 BIO_free(btmp);
 137         return 0;
 138
 139         }
 140
 141 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 142         {
 143         int i;
 144         BIO *out=NULL,*btmp=NULL;
 145         X509_ALGOR *xa = NULL;
 146         const EVP_CIPHER *evp_cipher=NULL;
 147         STACK_OF(X509_ALGOR) *md_sk=NULL;
 148         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 149         X509_ALGOR *xalg=NULL;
 150         PKCS7_RECIP_INFO *ri=NULL;
 151         EVP_PKEY *pkey;
 152         ASN1_OCTET_STRING *os=NULL;
 153
 154         i=OBJ_obj2nid(p7->type);
 155         p7->state=PKCS7_S_HEADER;
 156
 157         switch (i)
 158                 {
 159         case NID_pkcs7_signed:
 160                 md_sk=p7->d.sign->md_algs;
 161                 os = PKCS7_get_octet_string(p7->d.sign->contents);
 162                 break;
 163         case NID_pkcs7_signedAndEnveloped:
 164                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 165                 md_sk=p7->d.signed_and_enveloped->md_algs;
 166                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 167                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 168                 if (evp_cipher == NULL)
 169                         {
 170                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 171                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 172                         goto err;
 173                         }
 174                 break;
 175         case NID_pkcs7_enveloped:
 176                 rsk=p7->d.enveloped->recipientinfo;
 177                 xalg=p7->d.enveloped->enc_data->algorithm;
 178                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 179                 if (evp_cipher == NULL)
 180                         {
 181                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 182                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 183                         goto err;
 184                         }
 185                 break;
 186         case NID_pkcs7_digest:
 187                 xa = p7->d.digest->md;
 188                 os = PKCS7_get_octet_string(p7->d.digest->contents);
 189                 break;
 190         default:
 191                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 192                 goto err;
 193                 }
 194
 195         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 196                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 197                         goto err;
 198
 199         if (xa && !PKCS7_bio_add_digest(&out, xa))
 200                         goto err;
 201
 202         if (evp_cipher != NULL)
 203                 {
 204                 unsigned char key[EVP_MAX_KEY_LENGTH];
 205                 unsigned char iv[EVP_MAX_IV_LENGTH];
 206                 int keylen,ivlen;
 207                 int jj,max;
 208                 unsigned char *tmp;
 209                 EVP_CIPHER_CTX *ctx;
 210
 211                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 212                         {
 213                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 214                         goto err;
 215                         }
 216                 BIO_get_cipher_ctx(btmp, &ctx);
 217                 keylen=EVP_CIPHER_key_length(evp_cipher);
 218                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 219                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 220                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
 221                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
 222                         goto err;
 223                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 224                         goto err;
 225                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 226                         goto err;
 227
 228                 if (ivlen > 0) {
 229                         if (xalg->parameter == NULL)
 230                                                 xalg->parameter=ASN1_TYPE_new();
 231                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 232                                                                        goto err;
 233                 }
 234
 235                 /* Lets do the pub key stuff :-) */
 236                 max=0;
 237                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 238                         {
 239                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 240                         if (ri->cert == NULL)
 241                                 {
 242                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 243                                 goto err;
 244                                 }
 245                         pkey=X509_get_pubkey(ri->cert);
 246                         jj=EVP_PKEY_size(pkey);
 247                         EVP_PKEY_free(pkey);
 248                         if (max < jj) max=jj;
 249                         }
 250                 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
 251                         {
 252                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 253                         goto err;
 254                         }
 255                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 256                         {
 257                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 258                         pkey=X509_get_pubkey(ri->cert);
 259                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 260                         EVP_PKEY_free(pkey);
 261                         if (jj <= 0)
 262                                 {
 263                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 264                                 OPENSSL_free(tmp);
 265                                 goto err;
 266                                 }
 267                         if (!M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj))
 268                                 {
 269                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 270                                         ERR_R_MALLOC_FAILURE);
 271                                 OPENSSL_free(tmp);
 272                                 goto err;
 273                                 }
 274                         }
 275                 OPENSSL_free(tmp);
 276                 OPENSSL_cleanse(key, keylen);
 277
 278                 if (out == NULL)
 279                         out=btmp;
 280                 else
 281                         BIO_push(out,btmp);
 282                 btmp=NULL;
 283                 }
 284
 285         if (bio == NULL)
 286                 {
 287                 if (PKCS7_is_detached(p7))
 288                         bio=BIO_new(BIO_s_null());
 289                 else if (os && os->length > 0)
 290                         bio = BIO_new_mem_buf(os->data, os->length);
 291                 if(bio == NULL)
 292                         {
 293                         bio=BIO_new(BIO_s_mem());
 294                         BIO_set_mem_eof_return(bio,0);
 295                         }
 296                 }
 297         BIO_push(out,bio);
 298         bio=NULL;
 299         if (0)
 300                 {
 301 err:
 302                 if (out != NULL)
 303                         BIO_free_all(out);
 304                 if (btmp != NULL)
 305                         BIO_free_all(btmp);
 306                 out=NULL;
 307                 }
 308         return(out);
 309         }
 310
 311 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
 312         {
 313         int ret;
 314         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
 315                                 pcert->cert_info->issuer);
 316         if (ret)
 317                 return ret;
 318         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 319                                         ri->issuer_and_serial->serial);
 320         }
 321
 322 /* int */
 323 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 324         {
 325         int i,j;
 326         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 327         unsigned char *tmp=NULL;
 328         X509_ALGOR *xa;
 329         ASN1_OCTET_STRING *data_body=NULL;
 330         const EVP_MD *evp_md;
 331         const EVP_CIPHER *evp_cipher=NULL;
 332         EVP_CIPHER_CTX *evp_ctx=NULL;
 333         X509_ALGOR *enc_alg=NULL;
 334         STACK_OF(X509_ALGOR) *md_sk=NULL;
 335         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 336         X509_ALGOR *xalg=NULL;
 337         PKCS7_RECIP_INFO *ri=NULL;
 338
 339         i=OBJ_obj2nid(p7->type);
 340         p7->state=PKCS7_S_HEADER;
 341
 342         switch (i)
 343                 {
 344         case NID_pkcs7_signed:
 345                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 346                 md_sk=p7->d.sign->md_algs;
 347                 break;
 348         case NID_pkcs7_signedAndEnveloped:
 349                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 350                 md_sk=p7->d.signed_and_enveloped->md_algs;
 351                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 352                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 353                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 354                 if (evp_cipher == NULL)
 355                         {
 356                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 357                         goto err;
 358                         }
 359                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 360                 break;
 361         case NID_pkcs7_enveloped:
 362                 rsk=p7->d.enveloped->recipientinfo;
 363                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 364                 data_body=p7->d.enveloped->enc_data->enc_data;
 365                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 366                 if (evp_cipher == NULL)
 367                         {
 368                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 369                         goto err;
 370                         }
 371                 xalg=p7->d.enveloped->enc_data->algorithm;
 372                 break;
 373         default:
 374                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 375                 goto err;
 376                 }
 377
 378         /* We will be checking the signature */
 379         if (md_sk != NULL)
 380                 {
 381                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 382                         {
 383                         xa=sk_X509_ALGOR_value(md_sk,i);
 384                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 385                                 {
 386                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 387                                 goto err;
 388                                 }
 389
 390                         j=OBJ_obj2nid(xa->algorithm);
 391                         evp_md=EVP_get_digestbynid(j);
 392                         if (evp_md == NULL)
 393                                 {
 394                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 395                                 goto err;
 396                                 }
 397
 398                         BIO_set_md(btmp,evp_md);
 399                         if (out == NULL)
 400                                 out=btmp;
 401                         else
 402                                 BIO_push(out,btmp);
 403                         btmp=NULL;
 404                         }
 405                 }
 406
 407         if (evp_cipher != NULL)
 408                 {
 409 #if 0
 410                 unsigned char key[EVP_MAX_KEY_LENGTH];
 411                 unsigned char iv[EVP_MAX_IV_LENGTH];
 412                 unsigned char *p;
 413                 int keylen,ivlen;
 414                 int max;
 415                 X509_OBJECT ret;
 416 #endif
 417                 int jj;
 418
 419                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 420                         {
 421                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 422                         goto err;
 423                         }
 424
 425                 /* It was encrypted, we need to decrypt the secret key
 426                  * with the private key */
 427
 428                 /* Find the recipientInfo which matches the passed certificate
 429                  * (if any)
 430                  */
 431
 432                 if (pcert) {
 433                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 434                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 435                                 if (!pkcs7_cmp_ri(ri, pcert))
 436                                         break;
 437                                 ri=NULL;
 438                         }
 439                         if (ri == NULL) {
 440                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 441                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 442                                 goto err;
 443                         }
 444                 }
 445
 446                 jj=EVP_PKEY_size(pkey);
 447                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
 448                 if (tmp == NULL)
 449                         {
 450                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 451                         goto err;
 452                         }
 453
 454                 /* If we haven't got a certificate try each ri in turn */
 455
 456                 if (pcert == NULL)
 457                         {
 458                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 459                                 {
 460                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 461                                 jj=EVP_PKEY_decrypt(tmp,
 462                                         M_ASN1_STRING_data(ri->enc_key),
 463                                         M_ASN1_STRING_length(ri->enc_key),
 464                                                 pkey);
 465                                 if (jj > 0)
 466                                         break;
 467                                 ERR_clear_error();
 468                                 ri = NULL;
 469                                 }
 470                         if (ri == NULL)
 471                                 {
 472                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 473                                       PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
 474                                 goto err;
 475                                 }
 476                         }
 477                 else
 478                         {
 479                         jj=EVP_PKEY_decrypt(tmp,
 480                                 M_ASN1_STRING_data(ri->enc_key),
 481                                 M_ASN1_STRING_length(ri->enc_key), pkey);
 482                         if (jj <= 0)
 483                                 {
 484                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 485                                                                 ERR_R_EVP_LIB);
 486                                 goto err;
 487                                 }
 488                         }
 489
 490                 evp_ctx=NULL;
 491                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 492                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 493                         goto err;
 494                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 495                         goto err;
 496
 497                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 498                         /* Some S/MIME clients don't use the same key
 499                          * and effective key length. The key length is
 500                          * determined by the size of the decrypted RSA key.
 501                          */
 502                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 503                                 {
 504                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 505                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 506                                 goto err;
 507                                 }
 508                 }
 509                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0)
 510                         goto err;
 511
 512                 OPENSSL_cleanse(tmp,jj);
 513
 514                 if (out == NULL)
 515                         out=etmp;
 516                 else
 517                         BIO_push(out,etmp);
 518                 etmp=NULL;
 519                 }
 520
 521 #if 1
 522         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 523                 {
 524                 bio=in_bio;
 525                 }
 526         else
 527                 {
 528 #if 0
 529                 bio=BIO_new(BIO_s_mem());
 530                 /* We need to set this so that when we have read all
 531                  * the data, the encrypt BIO, if present, will read
 532                  * EOF and encode the last few bytes */
 533                 BIO_set_mem_eof_return(bio,0);
 534
 535                 if (data_body->length > 0)
 536                         BIO_write(bio,(char *)data_body->data,data_body->length);
 537 #else
 538                 if (data_body->length > 0)
 539                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 540                 else {
 541                         bio=BIO_new(BIO_s_mem());
 542                         BIO_set_mem_eof_return(bio,0);
 543                 }
 544 #endif
 545                 }
 546         BIO_push(out,bio);
 547         bio=NULL;
 548 #endif
 549         if (0)
 550                 {
 551 err:
 552                 if (out != NULL) BIO_free_all(out);
 553                 if (btmp != NULL) BIO_free_all(btmp);
 554                 if (etmp != NULL) BIO_free_all(etmp);
 555                 if (bio != NULL) BIO_free_all(bio);
 556                 out=NULL;
 557                 }
 558         if (tmp != NULL)
 559                 OPENSSL_free(tmp);
 560         return(out);
 561         }
 562
 563 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 564         {
 565         for (;;)
 566                 {
 567                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 568                 if (bio == NULL)
 569                         {
 570                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 571                         return NULL;
 572                         }
 573                 BIO_get_md_ctx(bio,pmd);
 574                 if (*pmd == NULL)
 575                         {
 576                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
 577                         return NULL;
 578                         }
 579                 if (EVP_MD_CTX_type(*pmd) == nid)
 580                         return bio;
 581                 bio=BIO_next(bio);
 582                 }
 583         return NULL;
 584         }
 585
 586 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 587         {
 588         int ret=0;
 589         int i,j;
 590         BIO *btmp;
 591         BUF_MEM *buf_mem=NULL;
 592         BUF_MEM *buf=NULL;
 593         PKCS7_SIGNER_INFO *si;
 594         EVP_MD_CTX *mdc,ctx_tmp;
 595         STACK_OF(X509_ATTRIBUTE) *sk;
 596         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 597         ASN1_OCTET_STRING *os=NULL;
 598
 599         EVP_MD_CTX_init(&ctx_tmp);
 600         i=OBJ_obj2nid(p7->type);
 601         p7->state=PKCS7_S_HEADER;
 602
 603         switch (i)
 604                 {
 605         case NID_pkcs7_signedAndEnveloped:
 606                 /* XXXXXXXXXXXXXXXX */
 607                 si_sk=p7->d.signed_and_enveloped->signer_info;
 608                 if (!(os=M_ASN1_OCTET_STRING_new()))
 609                         {
 610                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 611                         goto err;
 612                         }
 613                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 614                 break;
 615         case NID_pkcs7_enveloped:
 616                 /* XXXXXXXXXXXXXXXX */
 617                 if (!(os=M_ASN1_OCTET_STRING_new()))
 618                         {
 619                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 620                         goto err;
 621                         }
 622                 p7->d.enveloped->enc_data->enc_data=os;
 623                 break;
 624         case NID_pkcs7_signed:
 625                 si_sk=p7->d.sign->signer_info;
 626                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 627                 /* If detached data then the content is excluded */
 628                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 629                         M_ASN1_OCTET_STRING_free(os);
 630                         p7->d.sign->contents->d.data = NULL;
 631                 }
 632                 break;
 633
 634         case NID_pkcs7_digest:
 635                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 636                 /* If detached data then the content is excluded */
 637                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 638                         {
 639                         M_ASN1_OCTET_STRING_free(os);
 640                         p7->d.digest->contents->d.data = NULL;
 641                         }
 642                 break;
 643
 644                 }
 645
 646         if (si_sk != NULL)
 647                 {
 648                 if ((buf=BUF_MEM_new()) == NULL)
 649                         {
 650                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
 651                         goto err;
 652                         }
 653                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 654                         {
 655                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 656                         if (si->pkey == NULL) continue;
 657
 658                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 659
 660                         btmp=bio;
 661
 662                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 663
 664                         if (btmp == NULL)
 665                                 goto err;
 666
 667                         /* We now have the EVP_MD_CTX, lets do the
 668                          * signing. */
 669                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 670                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
 671                                 {
 672                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
 673                                 goto err;
 674                                 }
 675
 676                         sk=si->auth_attr;
 677
 678                         /* If there are attributes, we add the digest
 679                          * attribute and only sign the attributes */
 680                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 681                                 {
 682                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
 683                                 unsigned int md_len, alen;
 684                                 ASN1_OCTET_STRING *digest;
 685                                 ASN1_UTCTIME *sign_time;
 686                                 const EVP_MD *md_tmp;
 687
 688                                 /* Add signing time if not already present */
 689                                 if (!PKCS7_get_signed_attribute(si,
 690                                                         NID_pkcs9_signingTime))
 691                                         {
 692                                         if (!(sign_time=X509_gmtime_adj(NULL,0)))
 693                                                 {
 694                                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 695                                                         ERR_R_MALLOC_FAILURE);
 696                                                 goto err;
 697                                                 }
 698                                         PKCS7_add_signed_attribute(si,
 699                                                 NID_pkcs9_signingTime,
 700                                                 V_ASN1_UTCTIME,sign_time);
 701                                         }
 702
 703                                 /* Add digest */
 704                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 705                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
 706                                 if (!(digest=M_ASN1_OCTET_STRING_new()))
 707                                         {
 708                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 709                                                 ERR_R_MALLOC_FAILURE);
 710                                         goto err;
 711                                         }
 712                                 if (!M_ASN1_OCTET_STRING_set(digest,md_data,
 713                                                                 md_len))
 714                                         {
 715                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 716                                                 ERR_R_MALLOC_FAILURE);
 717                                         goto err;
 718                                         }
 719                                 PKCS7_add_signed_attribute(si,
 720                                         NID_pkcs9_messageDigest,
 721                                         V_ASN1_OCTET_STRING,digest);
 722
 723                                 /* Now sign the attributes */
 724                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
 725                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
 726                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 727                                 if(!abuf) goto err;
 728                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
 729                                 OPENSSL_free(abuf);
 730                                 }
 731
 732 #ifndef OPENSSL_NO_DSA
 733                         if (si->pkey->type == EVP_PKEY_DSA)
 734                                 ctx_tmp.digest=EVP_dss1();
 735 #endif
 736 #ifndef OPENSSL_NO_ECDSA
 737                         if (si->pkey->type == EVP_PKEY_EC)
 738                                 ctx_tmp.digest=EVP_ecdsa();
 739 #endif
 740
 741                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 742                                 (unsigned int *)&buf->length,si->pkey))
 743                                 {
 744                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_EVP_LIB);
 745                                 goto err;
 746                                 }
 747                         if (!ASN1_STRING_set(si->enc_digest,
 748                                 (unsigned char *)buf->data,buf->length))
 749                                 {
 750                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_ASN1_LIB);
 751                                 goto err;
 752                                 }
 753                         }
 754                 }
 755         else if (i == NID_pkcs7_digest)
 756                 {
 757                 unsigned char md_data[EVP_MAX_MD_SIZE];
 758                 unsigned int md_len;
 759                 if (!PKCS7_find_digest(&mdc, bio,
 760                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 761                         goto err;
 762                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
 763                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 764                 }
 765
 766         if (!PKCS7_is_detached(p7))
 767                 {
 768                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 769                 if (btmp == NULL)
 770                         {
 771                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 772                         goto err;
 773                         }
 774                 BIO_get_mem_ptr(btmp,&buf_mem);
 775                 /* Mark the BIO read only then we can use its copy of the data
 776                  * instead of making an extra copy.
 777                  */
 778                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 779                 BIO_set_mem_eof_return(btmp, 0);
 780                 os->data = (unsigned char *)buf_mem->data;
 781                 os->length = buf_mem->length;
 782 #if 0
 783                 M_ASN1_OCTET_STRING_set(os,
 784                         (unsigned char *)buf_mem->data,buf_mem->length);
 785 #endif
 786                 }
 787         ret=1;
 788 err:
 789         EVP_MD_CTX_cleanup(&ctx_tmp);
 790         if (buf != NULL) BUF_MEM_free(buf);
 791         return(ret);
 792         }
 793
 794 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 795              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 796         {
 797         PKCS7_ISSUER_AND_SERIAL *ias;
 798         int ret=0,i;
 799         STACK_OF(X509) *cert;
 800         X509 *x509;
 801
 802         if (PKCS7_type_is_signed(p7))
 803                 {
 804                 cert=p7->d.sign->cert;
 805                 }
 806         else if (PKCS7_type_is_signedAndEnveloped(p7))
 807                 {
 808                 cert=p7->d.signed_and_enveloped->cert;
 809                 }
 810         else
 811                 {
 812                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 813                 goto err;
 814                 }
 815         /* XXXXXXXXXXXXXXXXXXXXXXX */
 816         ias=si->issuer_and_serial;
 817
 818         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 819
 820         /* were we able to find the cert in passed to us */
 821         if (x509 == NULL)
 822                 {
 823                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 824                 goto err;
 825                 }
 826
 827         /* Lets verify */
 828         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 829                 {
 830                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 831                 goto err;
 832                 }
 833         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 834         i=X509_verify_cert(ctx);
 835         if (i <= 0)
 836                 {
 837                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 838                 X509_STORE_CTX_cleanup(ctx);
 839                 goto err;
 840                 }
 841         X509_STORE_CTX_cleanup(ctx);
 842
 843         return PKCS7_signatureVerify(bio, p7, si, x509);
 844         err:
 845         return ret;
 846         }
 847
 848 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 849                                                                 X509 *x509)
 850         {
 851         ASN1_OCTET_STRING *os;
 852         EVP_MD_CTX mdc_tmp,*mdc;
 853         int ret=0,i;
 854         int md_type;
 855         STACK_OF(X509_ATTRIBUTE) *sk;
 856         BIO *btmp;
 857         EVP_PKEY *pkey;
 858
 859         EVP_MD_CTX_init(&mdc_tmp);
 860
 861         if (!PKCS7_type_is_signed(p7) &&
 862                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 863                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 864                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 865                 goto err;
 866         }
 867
 868         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 869
 870         btmp=bio;
 871         for (;;)
 872                 {
 873                 if ((btmp == NULL) ||
 874                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 875                         {
 876                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 877                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 878                         goto err;
 879                         }
 880                 BIO_get_md_ctx(btmp,&mdc);
 881                 if (mdc == NULL)
 882                         {
 883                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 884                                                         ERR_R_INTERNAL_ERROR);
 885                         goto err;
 886                         }
 887                 if (EVP_MD_CTX_type(mdc) == md_type)
 888                         break;
 889                 /* Workaround for some broken clients that put the signature
 890                  * OID instead of the digest OID in digest_alg->algorithm
 891                  */
 892                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
 893                         break;
 894                 btmp=BIO_next(btmp);
 895                 }
 896
 897         /* mdc is the digest ctx that we want, unless there are attributes,
 898          * in which case the digest is the signed attributes */
 899         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
 900
 901         sk=si->auth_attr;
 902         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 903                 {
 904                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
 905                 unsigned int md_len, alen;
 906                 ASN1_OCTET_STRING *message_digest;
 907
 908                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
 909                 message_digest=PKCS7_digest_from_attributes(sk);
 910                 if (!message_digest)
 911                         {
 912                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 913                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 914                         goto err;
 915                         }
 916                 if ((message_digest->length != (int)md_len) ||
 917                         (memcmp(message_digest->data,md_dat,md_len)))
 918                         {
 919 #if 0
 920 {
 921 int ii;
 922 for (ii=0; ii<message_digest->length; ii++)
 923         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 924 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 925 }
 926 #endif
 927                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 928                                                         PKCS7_R_DIGEST_FAILURE);
 929                         ret= -1;
 930                         goto err;
 931                         }
 932
 933                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
 934
 935                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
 936                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
 937                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
 938
 939                 OPENSSL_free(abuf);
 940                 }
 941
 942         os=si->enc_digest;
 943         pkey = X509_get_pubkey(x509);
 944         if (!pkey)
 945                 {
 946                 ret = -1;
 947                 goto err;
 948                 }
 949 #ifndef OPENSSL_NO_DSA
 950         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 951 #endif
 952 #ifndef OPENSSL_NO_ECDSA
 953         if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
 954 #endif
 955
 956         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 957         EVP_PKEY_free(pkey);
 958         if (i <= 0)
 959                 {
 960                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 961                                                 PKCS7_R_SIGNATURE_FAILURE);
 962                 ret= -1;
 963                 goto err;
 964                 }
 965         else
 966                 ret=1;
 967 err:
 968         EVP_MD_CTX_cleanup(&mdc_tmp);
 969         return(ret);
 970         }
 971
 972 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 973         {
 974         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 975         PKCS7_RECIP_INFO *ri;
 976         int i;
 977
 978         i=OBJ_obj2nid(p7->type);
 979         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 980         rsk=p7->d.signed_and_enveloped->recipientinfo;
 981         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 982         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 983         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 984         return(ri->issuer_and_serial);
 985         }
 986
 987 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 988         {
 989         return(get_attribute(si->auth_attr,nid));
 990         }
 991
 992 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 993         {
 994         return(get_attribute(si->unauth_attr,nid));
 995         }
 996
 997 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 998         {
 999         int i;
1000         X509_ATTRIBUTE *xa;
1001         ASN1_OBJECT *o;
1002
1003         o=OBJ_nid2obj(nid);
1004         if (!o || !sk) return(NULL);
1005         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1006                 {
1007                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1008                 if (OBJ_cmp(xa->object,o) == 0)
1009                         {
1010                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1011                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1012                         else
1013                                 return(NULL);
1014                         }
1015                 }
1016         return(NULL);
1017         }
1018
1019 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1020 {
1021         ASN1_TYPE *astype;
1022         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1023         return astype->value.octet_string;
1024 }
1025
1026 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1027                                 STACK_OF(X509_ATTRIBUTE) *sk)
1028         {
1029         int i;
1030
1031         if (p7si->auth_attr != NULL)
1032                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1033         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1034         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1035                 {
1036                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1037                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1038                     == NULL)
1039                         return(0);
1040                 }
1041         return(1);
1042         }
1043
1044 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1045         {
1046         int i;
1047
1048         if (p7si->unauth_attr != NULL)
1049                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1050                                            X509_ATTRIBUTE_free);
1051         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1052         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1053                 {
1054                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1055                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1056                     == NULL)
1057                         return(0);
1058                 }
1059         return(1);
1060         }
1061
1062 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1063              void *value)
1064         {
1065         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1066         }
1067
1068 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1069              void *value)
1070         {
1071         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1072         }
1073
1074 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1075                          void *value)
1076         {
1077         X509_ATTRIBUTE *attr=NULL;
1078
1079         if (*sk == NULL)
1080                 {
1081                 *sk = sk_X509_ATTRIBUTE_new_null();
1082 new_attrib:
1083                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1084                 sk_X509_ATTRIBUTE_push(*sk,attr);
1085                 }
1086         else
1087                 {
1088                 int i;
1089
1090                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1091                         {
1092                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1093                         if (OBJ_obj2nid(attr->object) == nid)
1094                                 {
1095                                 X509_ATTRIBUTE_free(attr);
1096                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1097                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1098                                 goto end;
1099                                 }
1100                         }
1101                 goto new_attrib;
1102                 }
1103 end:
1104         return(1);
1105         }
1106