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 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
 142                                         unsigned char *key, int keylen)
 143         {
 144         EVP_PKEY_CTX *pctx = NULL;
 145         EVP_PKEY *pkey = NULL;
 146         unsigned char *ek = NULL;
 147         int ret = 0;
 148         int eklen;
 149
 150         pkey = X509_get_pubkey(ri->cert);
 151
 152         if (!pkey)
 153                 return 0;
 154
 155         pctx = EVP_PKEY_CTX_new(pkey, NULL);
 156         if (!pctx)
 157                 return 0;
 158
 159         if (EVP_PKEY_encrypt_init(pctx) <= 0)
 160                 goto err;
 161
 162         if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
 163                                 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0)
 164                 {
 165                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
 166                 goto err;
 167                 }
 168
 169         if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
 170                 goto err;
 171
 172         ek = OPENSSL_malloc(eklen);
 173
 174         if (ek == NULL)
 175                 {
 176                 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
 177                 goto err;
 178                 }
 179
 180         if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
 181                 goto err;
 182
 183         ASN1_STRING_set0(ri->enc_key, ek, eklen);
 184         ek = NULL;
 185
 186         ret = 1;
 187
 188         err:
 189         if (pkey)
 190                 EVP_PKEY_free(pkey);
 191         if (pctx)
 192                 EVP_PKEY_CTX_free(pctx);
 193         if (ek)
 194                 OPENSSL_free(ek);
 195         return ret;
 196
 197         }
 198
 199
 200
 201 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 202         {
 203         int i;
 204         BIO *out=NULL,*btmp=NULL;
 205         X509_ALGOR *xa = NULL;
 206         const EVP_CIPHER *evp_cipher=NULL;
 207         STACK_OF(X509_ALGOR) *md_sk=NULL;
 208         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 209         X509_ALGOR *xalg=NULL;
 210         PKCS7_RECIP_INFO *ri=NULL;
 211         ASN1_OCTET_STRING *os=NULL;
 212
 213         i=OBJ_obj2nid(p7->type);
 214         p7->state=PKCS7_S_HEADER;
 215
 216         switch (i)
 217                 {
 218         case NID_pkcs7_signed:
 219                 md_sk=p7->d.sign->md_algs;
 220                 os = PKCS7_get_octet_string(p7->d.sign->contents);
 221                 break;
 222         case NID_pkcs7_signedAndEnveloped:
 223                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 224                 md_sk=p7->d.signed_and_enveloped->md_algs;
 225                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 226                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 227                 if (evp_cipher == NULL)
 228                         {
 229                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 230                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 231                         goto err;
 232                         }
 233                 break;
 234         case NID_pkcs7_enveloped:
 235                 rsk=p7->d.enveloped->recipientinfo;
 236                 xalg=p7->d.enveloped->enc_data->algorithm;
 237                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 238                 if (evp_cipher == NULL)
 239                         {
 240                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 241                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 242                         goto err;
 243                         }
 244                 break;
 245         case NID_pkcs7_digest:
 246                 xa = p7->d.digest->md;
 247                 os = PKCS7_get_octet_string(p7->d.digest->contents);
 248                 break;
 249         default:
 250                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 251                 goto err;
 252                 }
 253
 254         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 255                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 256                         goto err;
 257
 258         if (xa && !PKCS7_bio_add_digest(&out, xa))
 259                         goto err;
 260
 261         if (evp_cipher != NULL)
 262                 {
 263                 unsigned char key[EVP_MAX_KEY_LENGTH];
 264                 unsigned char iv[EVP_MAX_IV_LENGTH];
 265                 int keylen,ivlen;
 266                 EVP_CIPHER_CTX *ctx;
 267
 268                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 269                         {
 270                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 271                         goto err;
 272                         }
 273                 BIO_get_cipher_ctx(btmp, &ctx);
 274                 keylen=EVP_CIPHER_key_length(evp_cipher);
 275                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 276                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 277                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
 278                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
 279                         goto err;
 280                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 281                         goto err;
 282                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 283                         goto err;
 284
 285                 if (ivlen > 0) {
 286                         if (xalg->parameter == NULL)
 287                                                 xalg->parameter=ASN1_TYPE_new();
 288                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 289                                                                        goto err;
 290                 }
 291
 292                 /* Lets do the pub key stuff :-) */
 293                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 294                         {
 295                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 296                         if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
 297                                 goto err;
 298                         }
 299                 OPENSSL_cleanse(key, keylen);
 300
 301                 if (out == NULL)
 302                         out=btmp;
 303                 else
 304                         BIO_push(out,btmp);
 305                 btmp=NULL;
 306                 }
 307
 308         if (bio == NULL)
 309                 {
 310                 if (PKCS7_is_detached(p7))
 311                         bio=BIO_new(BIO_s_null());
 312                 else if (os && os->length > 0)
 313                         bio = BIO_new_mem_buf(os->data, os->length);
 314                 if(bio == NULL)
 315                         {
 316                         bio=BIO_new(BIO_s_mem());
 317                         BIO_set_mem_eof_return(bio,0);
 318                         }
 319                 }
 320         BIO_push(out,bio);
 321         bio=NULL;
 322         if (0)
 323                 {
 324 err:
 325                 if (out != NULL)
 326                         BIO_free_all(out);
 327                 if (btmp != NULL)
 328                         BIO_free_all(btmp);
 329                 out=NULL;
 330                 }
 331         return(out);
 332         }
 333
 334 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
 335         {
 336         int ret;
 337         ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
 338                                 pcert->cert_info->issuer);
 339         if (ret)
 340                 return ret;
 341         return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 342                                         ri->issuer_and_serial->serial);
 343         }
 344
 345 /* int */
 346 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 347         {
 348         int i,j;
 349         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 350         unsigned char *tmp=NULL;
 351         X509_ALGOR *xa;
 352         ASN1_OCTET_STRING *data_body=NULL;
 353         const EVP_MD *evp_md;
 354         const EVP_CIPHER *evp_cipher=NULL;
 355         EVP_CIPHER_CTX *evp_ctx=NULL;
 356         X509_ALGOR *enc_alg=NULL;
 357         STACK_OF(X509_ALGOR) *md_sk=NULL;
 358         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 359         X509_ALGOR *xalg=NULL;
 360         PKCS7_RECIP_INFO *ri=NULL;
 361
 362         i=OBJ_obj2nid(p7->type);
 363         p7->state=PKCS7_S_HEADER;
 364
 365         switch (i)
 366                 {
 367         case NID_pkcs7_signed:
 368                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 369                 md_sk=p7->d.sign->md_algs;
 370                 break;
 371         case NID_pkcs7_signedAndEnveloped:
 372                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 373                 md_sk=p7->d.signed_and_enveloped->md_algs;
 374                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 375                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 376                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 377                 if (evp_cipher == NULL)
 378                         {
 379                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 380                         goto err;
 381                         }
 382                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 383                 break;
 384         case NID_pkcs7_enveloped:
 385                 rsk=p7->d.enveloped->recipientinfo;
 386                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 387                 data_body=p7->d.enveloped->enc_data->enc_data;
 388                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 389                 if (evp_cipher == NULL)
 390                         {
 391                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 392                         goto err;
 393                         }
 394                 xalg=p7->d.enveloped->enc_data->algorithm;
 395                 break;
 396         default:
 397                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 398                 goto err;
 399                 }
 400
 401         /* We will be checking the signature */
 402         if (md_sk != NULL)
 403                 {
 404                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 405                         {
 406                         xa=sk_X509_ALGOR_value(md_sk,i);
 407                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 408                                 {
 409                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 410                                 goto err;
 411                                 }
 412
 413                         j=OBJ_obj2nid(xa->algorithm);
 414                         evp_md=EVP_get_digestbynid(j);
 415                         if (evp_md == NULL)
 416                                 {
 417                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 418                                 goto err;
 419                                 }
 420
 421                         BIO_set_md(btmp,evp_md);
 422                         if (out == NULL)
 423                                 out=btmp;
 424                         else
 425                                 BIO_push(out,btmp);
 426                         btmp=NULL;
 427                         }
 428                 }
 429
 430         if (evp_cipher != NULL)
 431                 {
 432 #if 0
 433                 unsigned char key[EVP_MAX_KEY_LENGTH];
 434                 unsigned char iv[EVP_MAX_IV_LENGTH];
 435                 unsigned char *p;
 436                 int keylen,ivlen;
 437                 int max;
 438                 X509_OBJECT ret;
 439 #endif
 440                 int jj;
 441
 442                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 443                         {
 444                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 445                         goto err;
 446                         }
 447
 448                 /* It was encrypted, we need to decrypt the secret key
 449                  * with the private key */
 450
 451                 /* Find the recipientInfo which matches the passed certificate
 452                  * (if any)
 453                  */
 454
 455                 if (pcert) {
 456                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 457                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 458                                 if (!pkcs7_cmp_ri(ri, pcert))
 459                                         break;
 460                                 ri=NULL;
 461                         }
 462                         if (ri == NULL) {
 463                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 464                                       PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 465                                 goto err;
 466                         }
 467                 }
 468
 469                 jj=EVP_PKEY_size(pkey);
 470                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
 471                 if (tmp == NULL)
 472                         {
 473                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 474                         goto err;
 475                         }
 476
 477                 /* If we haven't got a certificate try each ri in turn */
 478
 479                 if (pcert == NULL)
 480                         {
 481                         for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 482                                 {
 483                                 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 484                                 jj=EVP_PKEY_decrypt_old(tmp,
 485                                         M_ASN1_STRING_data(ri->enc_key),
 486                                         M_ASN1_STRING_length(ri->enc_key),
 487                                                 pkey);
 488                                 if (jj > 0)
 489                                         break;
 490                                 ERR_clear_error();
 491                                 ri = NULL;
 492                                 }
 493                         if (ri == NULL)
 494                                 {
 495                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 496                                       PKCS7_R_NO_RECIPIENT_MATCHES_KEY);
 497                                 goto err;
 498                                 }
 499                         }
 500                 else
 501                         {
 502                         jj=EVP_PKEY_decrypt_old(tmp,
 503                                 M_ASN1_STRING_data(ri->enc_key),
 504                                 M_ASN1_STRING_length(ri->enc_key), pkey);
 505                         if (jj <= 0)
 506                                 {
 507                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 508                                                                 ERR_R_EVP_LIB);
 509                                 goto err;
 510                                 }
 511                         }
 512
 513                 evp_ctx=NULL;
 514                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 515                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 516                         goto err;
 517                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 518                         goto err;
 519
 520                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 521                         /* Some S/MIME clients don't use the same key
 522                          * and effective key length. The key length is
 523                          * determined by the size of the decrypted RSA key.
 524                          */
 525                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 526                                 {
 527                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 528                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 529                                 goto err;
 530                                 }
 531                 }
 532                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0)
 533                         goto err;
 534
 535                 OPENSSL_cleanse(tmp,jj);
 536
 537                 if (out == NULL)
 538                         out=etmp;
 539                 else
 540                         BIO_push(out,etmp);
 541                 etmp=NULL;
 542                 }
 543
 544 #if 1
 545         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 546                 {
 547                 bio=in_bio;
 548                 }
 549         else
 550                 {
 551 #if 0
 552                 bio=BIO_new(BIO_s_mem());
 553                 /* We need to set this so that when we have read all
 554                  * the data, the encrypt BIO, if present, will read
 555                  * EOF and encode the last few bytes */
 556                 BIO_set_mem_eof_return(bio,0);
 557
 558                 if (data_body->length > 0)
 559                         BIO_write(bio,(char *)data_body->data,data_body->length);
 560 #else
 561                 if (data_body->length > 0)
 562                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 563                 else {
 564                         bio=BIO_new(BIO_s_mem());
 565                         BIO_set_mem_eof_return(bio,0);
 566                 }
 567 #endif
 568                 }
 569         BIO_push(out,bio);
 570         bio=NULL;
 571 #endif
 572         if (0)
 573                 {
 574 err:
 575                 if (out != NULL) BIO_free_all(out);
 576                 if (btmp != NULL) BIO_free_all(btmp);
 577                 if (etmp != NULL) BIO_free_all(etmp);
 578                 if (bio != NULL) BIO_free_all(bio);
 579                 out=NULL;
 580                 }
 581         if (tmp != NULL)
 582                 OPENSSL_free(tmp);
 583         return(out);
 584         }
 585
 586 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 587         {
 588         for (;;)
 589                 {
 590                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 591                 if (bio == NULL)
 592                         {
 593                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 594                         return NULL;
 595                         }
 596                 BIO_get_md_ctx(bio,pmd);
 597                 if (*pmd == NULL)
 598                         {
 599                         PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
 600                         return NULL;
 601                         }
 602                 if (EVP_MD_CTX_type(*pmd) == nid)
 603                         return bio;
 604                 bio=BIO_next(bio);
 605                 }
 606         return NULL;
 607         }
 608
 609 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 610         {
 611         int ret=0;
 612         int i,j;
 613         BIO *btmp;
 614         BUF_MEM *buf_mem=NULL;
 615         BUF_MEM *buf=NULL;
 616         PKCS7_SIGNER_INFO *si;
 617         EVP_MD_CTX *mdc,ctx_tmp;
 618         STACK_OF(X509_ATTRIBUTE) *sk;
 619         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 620         ASN1_OCTET_STRING *os=NULL;
 621
 622         EVP_MD_CTX_init(&ctx_tmp);
 623         i=OBJ_obj2nid(p7->type);
 624         p7->state=PKCS7_S_HEADER;
 625
 626         switch (i)
 627                 {
 628         case NID_pkcs7_signedAndEnveloped:
 629                 /* XXXXXXXXXXXXXXXX */
 630                 si_sk=p7->d.signed_and_enveloped->signer_info;
 631                 if (!(os=M_ASN1_OCTET_STRING_new()))
 632                         {
 633                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 634                         goto err;
 635                         }
 636                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 637                 break;
 638         case NID_pkcs7_enveloped:
 639                 /* XXXXXXXXXXXXXXXX */
 640                 if (!(os=M_ASN1_OCTET_STRING_new()))
 641                         {
 642                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
 643                         goto err;
 644                         }
 645                 p7->d.enveloped->enc_data->enc_data=os;
 646                 break;
 647         case NID_pkcs7_signed:
 648                 si_sk=p7->d.sign->signer_info;
 649                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 650                 /* If detached data then the content is excluded */
 651                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 652                         M_ASN1_OCTET_STRING_free(os);
 653                         p7->d.sign->contents->d.data = NULL;
 654                 }
 655                 break;
 656
 657         case NID_pkcs7_digest:
 658                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 659                 /* If detached data then the content is excluded */
 660                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 661                         {
 662                         M_ASN1_OCTET_STRING_free(os);
 663                         p7->d.digest->contents->d.data = NULL;
 664                         }
 665                 break;
 666
 667                 }
 668
 669         if (si_sk != NULL)
 670                 {
 671                 if ((buf=BUF_MEM_new()) == NULL)
 672                         {
 673                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
 674                         goto err;
 675                         }
 676                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 677                         {
 678                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 679                         if (si->pkey == NULL) continue;
 680
 681                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 682
 683                         btmp=bio;
 684
 685                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 686
 687                         if (btmp == NULL)
 688                                 goto err;
 689
 690                         /* We now have the EVP_MD_CTX, lets do the
 691                          * signing. */
 692                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 693                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
 694                                 {
 695                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_BIO_LIB);
 696                                 goto err;
 697                                 }
 698
 699                         sk=si->auth_attr;
 700
 701                         /* If there are attributes, we add the digest
 702                          * attribute and only sign the attributes */
 703                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 704                                 {
 705                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
 706                                 unsigned int md_len, alen;
 707                                 ASN1_OCTET_STRING *digest;
 708                                 ASN1_UTCTIME *sign_time;
 709                                 const EVP_MD *md_tmp;
 710
 711                                 /* Add signing time if not already present */
 712                                 if (!PKCS7_get_signed_attribute(si,
 713                                                         NID_pkcs9_signingTime))
 714                                         {
 715                                         if (!(sign_time=X509_gmtime_adj(NULL,0)))
 716                                                 {
 717                                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 718                                                         ERR_R_MALLOC_FAILURE);
 719                                                 goto err;
 720                                                 }
 721                                         PKCS7_add_signed_attribute(si,
 722                                                 NID_pkcs9_signingTime,
 723                                                 V_ASN1_UTCTIME,sign_time);
 724                                         }
 725
 726                                 /* Add digest */
 727                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 728                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
 729                                 if (!(digest=M_ASN1_OCTET_STRING_new()))
 730                                         {
 731                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 732                                                 ERR_R_MALLOC_FAILURE);
 733                                         goto err;
 734                                         }
 735                                 if (!M_ASN1_OCTET_STRING_set(digest,md_data,
 736                                                                 md_len))
 737                                         {
 738                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
 739                                                 ERR_R_MALLOC_FAILURE);
 740                                         goto err;
 741                                         }
 742                                 PKCS7_add_signed_attribute(si,
 743                                         NID_pkcs9_messageDigest,
 744                                         V_ASN1_OCTET_STRING,digest);
 745
 746                                 /* Now sign the attributes */
 747                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
 748                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
 749                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 750                                 if(!abuf) goto err;
 751                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
 752                                 OPENSSL_free(abuf);
 753                                 }
 754
 755 #ifndef OPENSSL_NO_DSA
 756                         if (si->pkey->type == EVP_PKEY_DSA)
 757                                 ctx_tmp.digest=EVP_dss1();
 758 #endif
 759 #ifndef OPENSSL_NO_ECDSA
 760                         if (si->pkey->type == EVP_PKEY_EC)
 761                                 ctx_tmp.digest=EVP_ecdsa();
 762 #endif
 763
 764                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 765                                 (unsigned int *)&buf->length,si->pkey))
 766                                 {
 767                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_EVP_LIB);
 768                                 goto err;
 769                                 }
 770                         if (!ASN1_STRING_set(si->enc_digest,
 771                                 (unsigned char *)buf->data,buf->length))
 772                                 {
 773                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_ASN1_LIB);
 774                                 goto err;
 775                                 }
 776                         }
 777                 }
 778         else if (i == NID_pkcs7_digest)
 779                 {
 780                 unsigned char md_data[EVP_MAX_MD_SIZE];
 781                 unsigned int md_len;
 782                 if (!PKCS7_find_digest(&mdc, bio,
 783                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 784                         goto err;
 785                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
 786                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 787                 }
 788
 789         if (!PKCS7_is_detached(p7))
 790                 {
 791                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 792                 if (btmp == NULL)
 793                         {
 794                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 795                         goto err;
 796                         }
 797                 BIO_get_mem_ptr(btmp,&buf_mem);
 798                 /* Mark the BIO read only then we can use its copy of the data
 799                  * instead of making an extra copy.
 800                  */
 801                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 802                 BIO_set_mem_eof_return(btmp, 0);
 803                 os->data = (unsigned char *)buf_mem->data;
 804                 os->length = buf_mem->length;
 805 #if 0
 806                 M_ASN1_OCTET_STRING_set(os,
 807                         (unsigned char *)buf_mem->data,buf_mem->length);
 808 #endif
 809                 }
 810         ret=1;
 811 err:
 812         EVP_MD_CTX_cleanup(&ctx_tmp);
 813         if (buf != NULL) BUF_MEM_free(buf);
 814         return(ret);
 815         }
 816
 817 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 818              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 819         {
 820         PKCS7_ISSUER_AND_SERIAL *ias;
 821         int ret=0,i;
 822         STACK_OF(X509) *cert;
 823         X509 *x509;
 824
 825         if (PKCS7_type_is_signed(p7))
 826                 {
 827                 cert=p7->d.sign->cert;
 828                 }
 829         else if (PKCS7_type_is_signedAndEnveloped(p7))
 830                 {
 831                 cert=p7->d.signed_and_enveloped->cert;
 832                 }
 833         else
 834                 {
 835                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 836                 goto err;
 837                 }
 838         /* XXXXXXXXXXXXXXXXXXXXXXX */
 839         ias=si->issuer_and_serial;
 840
 841         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 842
 843         /* were we able to find the cert in passed to us */
 844         if (x509 == NULL)
 845                 {
 846                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 847                 goto err;
 848                 }
 849
 850         /* Lets verify */
 851         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 852                 {
 853                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 854                 goto err;
 855                 }
 856         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 857         i=X509_verify_cert(ctx);
 858         if (i <= 0)
 859                 {
 860                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 861                 X509_STORE_CTX_cleanup(ctx);
 862                 goto err;
 863                 }
 864         X509_STORE_CTX_cleanup(ctx);
 865
 866         return PKCS7_signatureVerify(bio, p7, si, x509);
 867         err:
 868         return ret;
 869         }
 870
 871 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 872                                                                 X509 *x509)
 873         {
 874         ASN1_OCTET_STRING *os;
 875         EVP_MD_CTX mdc_tmp,*mdc;
 876         int ret=0,i;
 877         int md_type;
 878         STACK_OF(X509_ATTRIBUTE) *sk;
 879         BIO *btmp;
 880         EVP_PKEY *pkey;
 881
 882         EVP_MD_CTX_init(&mdc_tmp);
 883
 884         if (!PKCS7_type_is_signed(p7) &&
 885                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 886                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 887                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 888                 goto err;
 889         }
 890
 891         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 892
 893         btmp=bio;
 894         for (;;)
 895                 {
 896                 if ((btmp == NULL) ||
 897                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 898                         {
 899                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 900                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 901                         goto err;
 902                         }
 903                 BIO_get_md_ctx(btmp,&mdc);
 904                 if (mdc == NULL)
 905                         {
 906                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 907                                                         ERR_R_INTERNAL_ERROR);
 908                         goto err;
 909                         }
 910                 if (EVP_MD_CTX_type(mdc) == md_type)
 911                         break;
 912                 /* Workaround for some broken clients that put the signature
 913                  * OID instead of the digest OID in digest_alg->algorithm
 914                  */
 915                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
 916                         break;
 917                 btmp=BIO_next(btmp);
 918                 }
 919
 920         /* mdc is the digest ctx that we want, unless there are attributes,
 921          * in which case the digest is the signed attributes */
 922         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
 923
 924         sk=si->auth_attr;
 925         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 926                 {
 927                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
 928                 unsigned int md_len, alen;
 929                 ASN1_OCTET_STRING *message_digest;
 930
 931                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
 932                 message_digest=PKCS7_digest_from_attributes(sk);
 933                 if (!message_digest)
 934                         {
 935                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 936                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 937                         goto err;
 938                         }
 939                 if ((message_digest->length != (int)md_len) ||
 940                         (memcmp(message_digest->data,md_dat,md_len)))
 941                         {
 942 #if 0
 943 {
 944 int ii;
 945 for (ii=0; ii<message_digest->length; ii++)
 946         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 947 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 948 }
 949 #endif
 950                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 951                                                         PKCS7_R_DIGEST_FAILURE);
 952                         ret= -1;
 953                         goto err;
 954                         }
 955
 956                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
 957
 958                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
 959                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
 960                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
 961
 962                 OPENSSL_free(abuf);
 963                 }
 964
 965         os=si->enc_digest;
 966         pkey = X509_get_pubkey(x509);
 967         if (!pkey)
 968                 {
 969                 ret = -1;
 970                 goto err;
 971                 }
 972 #if 0
 973 #ifndef OPENSSL_NO_DSA
 974         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 975 #endif
 976 #ifndef OPENSSL_NO_ECDSA
 977         if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
 978 #endif
 979 #endif
 980
 981         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 982         EVP_PKEY_free(pkey);
 983         if (i <= 0)
 984                 {
 985                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 986                                                 PKCS7_R_SIGNATURE_FAILURE);
 987                 ret= -1;
 988                 goto err;
 989                 }
 990         else
 991                 ret=1;
 992 err:
 993         EVP_MD_CTX_cleanup(&mdc_tmp);
 994         return(ret);
 995         }
 996
 997 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 998         {
 999         STACK_OF(PKCS7_RECIP_INFO) *rsk;
1000         PKCS7_RECIP_INFO *ri;
1001         int i;
1002
1003         i=OBJ_obj2nid(p7->type);
1004         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
1005         rsk=p7->d.signed_and_enveloped->recipientinfo;
1006         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1007         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1008         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1009         return(ri->issuer_and_serial);
1010         }
1011
1012 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1013         {
1014         return(get_attribute(si->auth_attr,nid));
1015         }
1016
1017 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1018         {
1019         return(get_attribute(si->unauth_attr,nid));
1020         }
1021
1022 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1023         {
1024         int i;
1025         X509_ATTRIBUTE *xa;
1026         ASN1_OBJECT *o;
1027
1028         o=OBJ_nid2obj(nid);
1029         if (!o || !sk) return(NULL);
1030         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1031                 {
1032                 xa=sk_X509_ATTRIBUTE_value(sk,i);
1033                 if (OBJ_cmp(xa->object,o) == 0)
1034                         {
1035                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1036                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
1037                         else
1038                                 return(NULL);
1039                         }
1040                 }
1041         return(NULL);
1042         }
1043
1044 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1045 {
1046         ASN1_TYPE *astype;
1047         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1048         return astype->value.octet_string;
1049 }
1050
1051 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1052                                 STACK_OF(X509_ATTRIBUTE) *sk)
1053         {
1054         int i;
1055
1056         if (p7si->auth_attr != NULL)
1057                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1058         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1059         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1060                 {
1061                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1062                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1063                     == NULL)
1064                         return(0);
1065                 }
1066         return(1);
1067         }
1068
1069 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1070         {
1071         int i;
1072
1073         if (p7si->unauth_attr != NULL)
1074                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1075                                            X509_ATTRIBUTE_free);
1076         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1077         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1078                 {
1079                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1080                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1081                     == NULL)
1082                         return(0);
1083                 }
1084         return(1);
1085         }
1086
1087 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1088              void *value)
1089         {
1090         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1091         }
1092
1093 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1094              void *value)
1095         {
1096         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1097         }
1098
1099 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1100                          void *value)
1101         {
1102         X509_ATTRIBUTE *attr=NULL;
1103
1104         if (*sk == NULL)
1105                 {
1106                 *sk = sk_X509_ATTRIBUTE_new_null();
1107 new_attrib:
1108                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1109                 sk_X509_ATTRIBUTE_push(*sk,attr);
1110                 }
1111         else
1112                 {
1113                 int i;
1114
1115                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1116                         {
1117                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1118                         if (OBJ_obj2nid(attr->object) == nid)
1119                                 {
1120                                 X509_ATTRIBUTE_free(attr);
1121                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1122                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1123                                 goto end;
1124                                 }
1125                         }
1126                 goto new_attrib;
1127                 }
1128 end:
1129         return(1);
1130         }
1131