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
  66 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
  67                          void *value);
  68 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
  69
  70 static int PKCS7_type_is_other(PKCS7* p7)
  71         {
  72         int isOther=1;
  73
  74         int nid=OBJ_obj2nid(p7->type);
  75
  76         switch( nid )
  77                 {
  78         case NID_pkcs7_data:
  79         case NID_pkcs7_signed:
  80         case NID_pkcs7_enveloped:
  81         case NID_pkcs7_signedAndEnveloped:
  82         case NID_pkcs7_digest:
  83         case NID_pkcs7_encrypted:
  84                 isOther=0;
  85                 break;
  86         default:
  87                 isOther=1;
  88                 }
  89
  90         return isOther;
  91
  92         }
  93
  94 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
  95         {
  96         if ( PKCS7_type_is_data(p7))
  97                 return p7->d.data;
  98         if ( PKCS7_type_is_other(p7) && p7->d.other
  99                 && (p7->d.other->type == V_ASN1_OCTET_STRING))
 100                 return p7->d.other->value.octet_string;
 101         return NULL;
 102         }
 103
 104 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
 105         {
 106         BIO *btmp;
 107         const EVP_MD *md;
 108         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 109                 {
 110                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 111                 goto err;
 112                 }
 113
 114         md=EVP_get_digestbyobj(alg->algorithm);
 115         if (md == NULL)
 116                 {
 117                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 118                 goto err;
 119                 }
 120
 121         BIO_set_md(btmp,md);
 122         if (*pbio == NULL)
 123                 *pbio=btmp;
 124         else if (!BIO_push(*pbio,btmp))
 125                 {
 126                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 127                 goto err;
 128                 }
 129         btmp=NULL;
 130
 131         return 1;
 132
 133         err:
 134         if (btmp)
 135                 BIO_free(btmp);
 136         return 0;
 137
 138         }
 139
 140 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 141         {
 142         int i;
 143         BIO *out=NULL,*btmp=NULL;
 144         X509_ALGOR *xa = NULL;
 145         const EVP_CIPHER *evp_cipher=NULL;
 146         STACK_OF(X509_ALGOR) *md_sk=NULL;
 147         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 148         X509_ALGOR *xalg=NULL;
 149         PKCS7_RECIP_INFO *ri=NULL;
 150         EVP_PKEY *pkey;
 151         ASN1_OCTET_STRING *os=NULL;
 152
 153         i=OBJ_obj2nid(p7->type);
 154         p7->state=PKCS7_S_HEADER;
 155
 156         switch (i)
 157                 {
 158         case NID_pkcs7_signed:
 159                 md_sk=p7->d.sign->md_algs;
 160                 os = PKCS7_get_octet_string(p7->d.sign->contents);
 161                 break;
 162         case NID_pkcs7_signedAndEnveloped:
 163                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 164                 md_sk=p7->d.signed_and_enveloped->md_algs;
 165                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 166                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 167                 if (evp_cipher == NULL)
 168                         {
 169                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 170                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 171                         goto err;
 172                         }
 173                 break;
 174         case NID_pkcs7_enveloped:
 175                 rsk=p7->d.enveloped->recipientinfo;
 176                 xalg=p7->d.enveloped->enc_data->algorithm;
 177                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 178                 if (evp_cipher == NULL)
 179                         {
 180                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 181                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 182                         goto err;
 183                         }
 184                 break;
 185         case NID_pkcs7_digest:
 186                 xa = p7->d.digest->md;
 187                 os = PKCS7_get_octet_string(p7->d.digest->contents);
 188                 break;
 189         default:
 190                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 191                 goto err;
 192                 }
 193
 194         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 195                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 196                         goto err;
 197
 198         if (xa && !PKCS7_bio_add_digest(&out, xa))
 199                         goto err;
 200
 201         if (evp_cipher != NULL)
 202                 {
 203                 unsigned char key[EVP_MAX_KEY_LENGTH];
 204                 unsigned char iv[EVP_MAX_IV_LENGTH];
 205                 int keylen,ivlen;
 206                 int jj,max;
 207                 unsigned char *tmp;
 208                 EVP_CIPHER_CTX *ctx;
 209
 210                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 211                         {
 212                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 213                         goto err;
 214                         }
 215                 BIO_get_cipher_ctx(btmp, &ctx);
 216                 keylen=EVP_CIPHER_key_length(evp_cipher);
 217                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 218                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 219                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
 220                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
 221                         goto err;
 222                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 223                         goto err;
 224                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 225                         goto err;
 226
 227                 if (ivlen > 0) {
 228                         if (xalg->parameter == NULL)
 229                                                 xalg->parameter=ASN1_TYPE_new();
 230                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 231                                                                        goto err;
 232                 }
 233
 234                 /* Lets do the pub key stuff :-) */
 235                 max=0;
 236                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 237                         {
 238                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 239                         if (ri->cert == NULL)
 240                                 {
 241                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 242                                 goto err;
 243                                 }
 244                         pkey=X509_get_pubkey(ri->cert);
 245                         jj=EVP_PKEY_size(pkey);
 246                         EVP_PKEY_free(pkey);
 247                         if (max < jj) max=jj;
 248                         }
 249                 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
 250                         {
 251                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 252                         goto err;
 253                         }
 254                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 255                         {
 256                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 257                         pkey=X509_get_pubkey(ri->cert);
 258                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 259                         EVP_PKEY_free(pkey);
 260                         if (jj <= 0)
 261                                 {
 262                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 263                                 OPENSSL_free(tmp);
 264                                 goto err;
 265                                 }
 266                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 267                         }
 268                 OPENSSL_free(tmp);
 269                 OPENSSL_cleanse(key, keylen);
 270
 271                 if (out == NULL)
 272                         out=btmp;
 273                 else
 274                         BIO_push(out,btmp);
 275                 btmp=NULL;
 276                 }
 277
 278         if (bio == NULL)
 279                 {
 280                 if (PKCS7_is_detached(p7))
 281                         bio=BIO_new(BIO_s_null());
 282                 else if (os && os->length > 0)
 283                         bio = BIO_new_mem_buf(os->data, os->length);
 284                 if(bio == NULL)
 285                         {
 286                         bio=BIO_new(BIO_s_mem());
 287                         BIO_set_mem_eof_return(bio,0);
 288                         }
 289                 }
 290         BIO_push(out,bio);
 291         bio=NULL;
 292         if (0)
 293                 {
 294 err:
 295                 if (out != NULL)
 296                         BIO_free_all(out);
 297                 if (btmp != NULL)
 298                         BIO_free_all(btmp);
 299                 out=NULL;
 300                 }
 301         return(out);
 302         }
 303
 304 /* int */
 305 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 306         {
 307         int i,j;
 308         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 309         unsigned char *tmp=NULL;
 310         X509_ALGOR *xa;
 311         ASN1_OCTET_STRING *data_body=NULL;
 312         const EVP_MD *evp_md;
 313         const EVP_CIPHER *evp_cipher=NULL;
 314         EVP_CIPHER_CTX *evp_ctx=NULL;
 315         X509_ALGOR *enc_alg=NULL;
 316         STACK_OF(X509_ALGOR) *md_sk=NULL;
 317         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 318         X509_ALGOR *xalg=NULL;
 319         PKCS7_RECIP_INFO *ri=NULL;
 320
 321         i=OBJ_obj2nid(p7->type);
 322         p7->state=PKCS7_S_HEADER;
 323
 324         switch (i)
 325                 {
 326         case NID_pkcs7_signed:
 327                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 328                 md_sk=p7->d.sign->md_algs;
 329                 break;
 330         case NID_pkcs7_signedAndEnveloped:
 331                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 332                 md_sk=p7->d.signed_and_enveloped->md_algs;
 333                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 334                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 335                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 336                 if (evp_cipher == NULL)
 337                         {
 338                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 339                         goto err;
 340                         }
 341                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 342                 break;
 343         case NID_pkcs7_enveloped:
 344                 rsk=p7->d.enveloped->recipientinfo;
 345                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 346                 data_body=p7->d.enveloped->enc_data->enc_data;
 347                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 348                 if (evp_cipher == NULL)
 349                         {
 350                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 351                         goto err;
 352                         }
 353                 xalg=p7->d.enveloped->enc_data->algorithm;
 354                 break;
 355         default:
 356                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 357                 goto err;
 358                 }
 359
 360         /* We will be checking the signature */
 361         if (md_sk != NULL)
 362                 {
 363                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 364                         {
 365                         xa=sk_X509_ALGOR_value(md_sk,i);
 366                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 367                                 {
 368                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 369                                 goto err;
 370                                 }
 371
 372                         j=OBJ_obj2nid(xa->algorithm);
 373                         evp_md=EVP_get_digestbynid(j);
 374                         if (evp_md == NULL)
 375                                 {
 376                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 377                                 goto err;
 378                                 }
 379
 380                         BIO_set_md(btmp,evp_md);
 381                         if (out == NULL)
 382                                 out=btmp;
 383                         else
 384                                 BIO_push(out,btmp);
 385                         btmp=NULL;
 386                         }
 387                 }
 388
 389         if (evp_cipher != NULL)
 390                 {
 391 #if 0
 392                 unsigned char key[EVP_MAX_KEY_LENGTH];
 393                 unsigned char iv[EVP_MAX_IV_LENGTH];
 394                 unsigned char *p;
 395                 int keylen,ivlen;
 396                 int max;
 397                 X509_OBJECT ret;
 398 #endif
 399                 int jj;
 400
 401                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 402                         {
 403                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 404                         goto err;
 405                         }
 406
 407                 /* It was encrypted, we need to decrypt the secret key
 408                  * with the private key */
 409
 410                 /* Find the recipientInfo which matches the passed certificate
 411                  * (if any)
 412                  */
 413
 414                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 415                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 416                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 417                                         pcert->cert_info->issuer) &&
 418                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 419                                         ri->issuer_and_serial->serial)) break;
 420                         ri=NULL;
 421                 }
 422                 if (ri == NULL) {
 423                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 424                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 425                         goto err;
 426                 }
 427
 428                 jj=EVP_PKEY_size(pkey);
 429                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
 430                 if (tmp == NULL)
 431                         {
 432                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 433                         goto err;
 434                         }
 435
 436                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 437                         M_ASN1_STRING_length(ri->enc_key), pkey);
 438                 if (jj <= 0)
 439                         {
 440                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 441                         goto err;
 442                         }
 443
 444                 evp_ctx=NULL;
 445                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 446                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 447                         goto err;
 448                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 449                         goto err;
 450
 451                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 452                         /* Some S/MIME clients don't use the same key
 453                          * and effective key length. The key length is
 454                          * determined by the size of the decrypted RSA key.
 455                          */
 456                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 457                                 {
 458                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 459                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 460                                 goto err;
 461                                 }
 462                 }
 463                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0)
 464                         goto err;
 465
 466                 OPENSSL_cleanse(tmp,jj);
 467
 468                 if (out == NULL)
 469                         out=etmp;
 470                 else
 471                         BIO_push(out,etmp);
 472                 etmp=NULL;
 473                 }
 474
 475 #if 1
 476         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 477                 {
 478                 bio=in_bio;
 479                 }
 480         else
 481                 {
 482 #if 0
 483                 bio=BIO_new(BIO_s_mem());
 484                 /* We need to set this so that when we have read all
 485                  * the data, the encrypt BIO, if present, will read
 486                  * EOF and encode the last few bytes */
 487                 BIO_set_mem_eof_return(bio,0);
 488
 489                 if (data_body->length > 0)
 490                         BIO_write(bio,(char *)data_body->data,data_body->length);
 491 #else
 492                 if (data_body->length > 0)
 493                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 494                 else {
 495                         bio=BIO_new(BIO_s_mem());
 496                         BIO_set_mem_eof_return(bio,0);
 497                 }
 498 #endif
 499                 }
 500         BIO_push(out,bio);
 501         bio=NULL;
 502 #endif
 503         if (0)
 504                 {
 505 err:
 506                 if (out != NULL) BIO_free_all(out);
 507                 if (btmp != NULL) BIO_free_all(btmp);
 508                 if (etmp != NULL) BIO_free_all(etmp);
 509                 if (bio != NULL) BIO_free_all(bio);
 510                 out=NULL;
 511                 }
 512         if (tmp != NULL)
 513                 OPENSSL_free(tmp);
 514         return(out);
 515         }
 516
 517 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 518         {
 519         for (;;)
 520                 {
 521                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 522                 if (bio == NULL)
 523                         {
 524                         PKCS7err(PKCS7_F_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 525                         return NULL;
 526                         }
 527                 BIO_get_md_ctx(bio,pmd);
 528                 if (*pmd == NULL)
 529                         {
 530                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_INTERNAL_ERROR);
 531                         return NULL;
 532                         }
 533                 if (EVP_MD_CTX_type(*pmd) == nid)
 534                         return bio;
 535                 bio=BIO_next(bio);
 536                 }
 537         return NULL;
 538         }
 539
 540 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 541         {
 542         int ret=0;
 543         int i,j;
 544         BIO *btmp;
 545         BUF_MEM *buf_mem=NULL;
 546         BUF_MEM *buf=NULL;
 547         PKCS7_SIGNER_INFO *si;
 548         EVP_MD_CTX *mdc,ctx_tmp;
 549         STACK_OF(X509_ATTRIBUTE) *sk;
 550         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 551         ASN1_OCTET_STRING *os=NULL;
 552
 553         EVP_MD_CTX_init(&ctx_tmp);
 554         i=OBJ_obj2nid(p7->type);
 555         p7->state=PKCS7_S_HEADER;
 556
 557         switch (i)
 558                 {
 559         case NID_pkcs7_signedAndEnveloped:
 560                 /* XXXXXXXXXXXXXXXX */
 561                 si_sk=p7->d.signed_and_enveloped->signer_info;
 562                 os=M_ASN1_OCTET_STRING_new();
 563                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 564                 break;
 565         case NID_pkcs7_enveloped:
 566                 /* XXXXXXXXXXXXXXXX */
 567                 os=M_ASN1_OCTET_STRING_new();
 568                 p7->d.enveloped->enc_data->enc_data=os;
 569                 break;
 570         case NID_pkcs7_signed:
 571                 si_sk=p7->d.sign->signer_info;
 572                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 573                 /* If detached data then the content is excluded */
 574                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 575                         M_ASN1_OCTET_STRING_free(os);
 576                         p7->d.sign->contents->d.data = NULL;
 577                 }
 578                 break;
 579
 580         case NID_pkcs7_digest:
 581                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 582                 /* If detached data then the content is excluded */
 583                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 584                         {
 585                         M_ASN1_OCTET_STRING_free(os);
 586                         p7->d.digest->contents->d.data = NULL;
 587                         }
 588                 break;
 589
 590                 }
 591
 592         if (si_sk != NULL)
 593                 {
 594                 if ((buf=BUF_MEM_new()) == NULL)
 595                         {
 596                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 597                         goto err;
 598                         }
 599                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 600                         {
 601                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 602                         if (si->pkey == NULL) continue;
 603
 604                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 605
 606                         btmp=bio;
 607
 608                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 609
 610                         if (btmp == NULL)
 611                                 goto err;
 612
 613                         /* We now have the EVP_MD_CTX, lets do the
 614                          * signing. */
 615                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 616                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
 617                                 {
 618                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 619                                 goto err;
 620                                 }
 621
 622                         sk=si->auth_attr;
 623
 624                         /* If there are attributes, we add the digest
 625                          * attribute and only sign the attributes */
 626                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 627                                 {
 628                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
 629                                 unsigned int md_len, alen;
 630                                 ASN1_OCTET_STRING *digest;
 631                                 ASN1_UTCTIME *sign_time;
 632                                 const EVP_MD *md_tmp;
 633
 634                                 /* Add signing time if not already present */
 635                                 if (!PKCS7_get_signed_attribute(si,
 636                                                         NID_pkcs9_signingTime))
 637                                         {
 638                                         sign_time=X509_gmtime_adj(NULL,0);
 639                                         PKCS7_add_signed_attribute(si,
 640                                                 NID_pkcs9_signingTime,
 641                                                 V_ASN1_UTCTIME,sign_time);
 642                                         }
 643
 644                                 /* Add digest */
 645                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 646                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
 647                                 digest=M_ASN1_OCTET_STRING_new();
 648                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 649                                 PKCS7_add_signed_attribute(si,
 650                                         NID_pkcs9_messageDigest,
 651                                         V_ASN1_OCTET_STRING,digest);
 652
 653                                 /* Now sign the attributes */
 654                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
 655                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
 656                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 657                                 if(!abuf) goto err;
 658                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
 659                                 OPENSSL_free(abuf);
 660                                 }
 661
 662 #ifndef OPENSSL_NO_DSA
 663                         if (si->pkey->type == EVP_PKEY_DSA)
 664                                 ctx_tmp.digest=EVP_dss1();
 665 #endif
 666 #ifndef OPENSSL_NO_ECDSA
 667                         if (si->pkey->type == EVP_PKEY_EC)
 668                                 ctx_tmp.digest=EVP_ecdsa();
 669 #endif
 670
 671                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 672                                 (unsigned int *)&buf->length,si->pkey))
 673                                 {
 674                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 675                                 goto err;
 676                                 }
 677                         if (!ASN1_STRING_set(si->enc_digest,
 678                                 (unsigned char *)buf->data,buf->length))
 679                                 {
 680                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 681                                 goto err;
 682                                 }
 683                         }
 684                 }
 685         else if (i == NID_pkcs7_digest)
 686                 {
 687                 unsigned char md_data[EVP_MAX_MD_SIZE];
 688                 unsigned int md_len;
 689                 if (!PKCS7_find_digest(&mdc, bio,
 690                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 691                         goto err;
 692                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
 693                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 694                 }
 695
 696         if (!PKCS7_is_detached(p7))
 697                 {
 698                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 699                 if (btmp == NULL)
 700                         {
 701                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 702                         goto err;
 703                         }
 704                 BIO_get_mem_ptr(btmp,&buf_mem);
 705                 /* Mark the BIO read only then we can use its copy of the data
 706                  * instead of making an extra copy.
 707                  */
 708                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 709                 BIO_set_mem_eof_return(btmp, 0);
 710                 os->data = (unsigned char *)buf_mem->data;
 711                 os->length = buf_mem->length;
 712 #if 0
 713                 M_ASN1_OCTET_STRING_set(os,
 714                         (unsigned char *)buf_mem->data,buf_mem->length);
 715 #endif
 716                 }
 717         ret=1;
 718 err:
 719         EVP_MD_CTX_cleanup(&ctx_tmp);
 720         if (buf != NULL) BUF_MEM_free(buf);
 721         return(ret);
 722         }
 723
 724 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 725              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 726         {
 727         PKCS7_ISSUER_AND_SERIAL *ias;
 728         int ret=0,i;
 729         STACK_OF(X509) *cert;
 730         X509 *x509;
 731
 732         if (PKCS7_type_is_signed(p7))
 733                 {
 734                 cert=p7->d.sign->cert;
 735                 }
 736         else if (PKCS7_type_is_signedAndEnveloped(p7))
 737                 {
 738                 cert=p7->d.signed_and_enveloped->cert;
 739                 }
 740         else
 741                 {
 742                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 743                 goto err;
 744                 }
 745         /* XXXXXXXXXXXXXXXXXXXXXXX */
 746         ias=si->issuer_and_serial;
 747
 748         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 749
 750         /* were we able to find the cert in passed to us */
 751         if (x509 == NULL)
 752                 {
 753                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 754                 goto err;
 755                 }
 756
 757         /* Lets verify */
 758         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 759                 {
 760                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 761                 goto err;
 762                 }
 763         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 764         i=X509_verify_cert(ctx);
 765         if (i <= 0)
 766                 {
 767                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 768                 X509_STORE_CTX_cleanup(ctx);
 769                 goto err;
 770                 }
 771         X509_STORE_CTX_cleanup(ctx);
 772
 773         return PKCS7_signatureVerify(bio, p7, si, x509);
 774         err:
 775         return ret;
 776         }
 777
 778 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 779                                                                 X509 *x509)
 780         {
 781         ASN1_OCTET_STRING *os;
 782         EVP_MD_CTX mdc_tmp,*mdc;
 783         int ret=0,i;
 784         int md_type;
 785         STACK_OF(X509_ATTRIBUTE) *sk;
 786         BIO *btmp;
 787         EVP_PKEY *pkey;
 788
 789         EVP_MD_CTX_init(&mdc_tmp);
 790
 791         if (!PKCS7_type_is_signed(p7) &&
 792                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 793                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 794                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 795                 goto err;
 796         }
 797
 798         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 799
 800         btmp=bio;
 801         for (;;)
 802                 {
 803                 if ((btmp == NULL) ||
 804                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 805                         {
 806                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 807                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 808                         goto err;
 809                         }
 810                 BIO_get_md_ctx(btmp,&mdc);
 811                 if (mdc == NULL)
 812                         {
 813                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 814                                                         ERR_R_INTERNAL_ERROR);
 815                         goto err;
 816                         }
 817                 if (EVP_MD_CTX_type(mdc) == md_type)
 818                         break;
 819                 /* Workaround for some broken clients that put the signature
 820                  * OID instead of the digest OID in digest_alg->algorithm
 821                  */
 822                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
 823                         break;
 824                 btmp=BIO_next(btmp);
 825                 }
 826
 827         /* mdc is the digest ctx that we want, unless there are attributes,
 828          * in which case the digest is the signed attributes */
 829         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
 830
 831         sk=si->auth_attr;
 832         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 833                 {
 834                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
 835                 unsigned int md_len, alen;
 836                 ASN1_OCTET_STRING *message_digest;
 837
 838                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
 839                 message_digest=PKCS7_digest_from_attributes(sk);
 840                 if (!message_digest)
 841                         {
 842                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 843                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 844                         goto err;
 845                         }
 846                 if ((message_digest->length != (int)md_len) ||
 847                         (memcmp(message_digest->data,md_dat,md_len)))
 848                         {
 849 #if 0
 850 {
 851 int ii;
 852 for (ii=0; ii<message_digest->length; ii++)
 853         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 854 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 855 }
 856 #endif
 857                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 858                                                         PKCS7_R_DIGEST_FAILURE);
 859                         ret= -1;
 860                         goto err;
 861                         }
 862
 863                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
 864
 865                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
 866                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
 867                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
 868
 869                 OPENSSL_free(abuf);
 870                 }
 871
 872         os=si->enc_digest;
 873         pkey = X509_get_pubkey(x509);
 874         if (!pkey)
 875                 {
 876                 ret = -1;
 877                 goto err;
 878                 }
 879 #ifndef OPENSSL_NO_DSA
 880         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 881 #endif
 882 #ifndef OPENSSL_NO_ECDSA
 883         if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
 884 #endif
 885
 886         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 887         EVP_PKEY_free(pkey);
 888         if (i <= 0)
 889                 {
 890                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 891                                                 PKCS7_R_SIGNATURE_FAILURE);
 892                 ret= -1;
 893                 goto err;
 894                 }
 895         else
 896                 ret=1;
 897 err:
 898         EVP_MD_CTX_cleanup(&mdc_tmp);
 899         return(ret);
 900         }
 901
 902 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 903         {
 904         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 905         PKCS7_RECIP_INFO *ri;
 906         int i;
 907
 908         i=OBJ_obj2nid(p7->type);
 909         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 910         rsk=p7->d.signed_and_enveloped->recipientinfo;
 911         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 912         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 913         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 914         return(ri->issuer_and_serial);
 915         }
 916
 917 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 918         {
 919         return(get_attribute(si->auth_attr,nid));
 920         }
 921
 922 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 923         {
 924         return(get_attribute(si->unauth_attr,nid));
 925         }
 926
 927 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 928         {
 929         int i;
 930         X509_ATTRIBUTE *xa;
 931         ASN1_OBJECT *o;
 932
 933         o=OBJ_nid2obj(nid);
 934         if (!o || !sk) return(NULL);
 935         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 936                 {
 937                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 938                 if (OBJ_cmp(xa->object,o) == 0)
 939                         {
 940                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
 941                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 942                         else
 943                                 return(NULL);
 944                         }
 945                 }
 946         return(NULL);
 947         }
 948
 949 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 950 {
 951         ASN1_TYPE *astype;
 952         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 953         return astype->value.octet_string;
 954 }
 955
 956 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 957                                 STACK_OF(X509_ATTRIBUTE) *sk)
 958         {
 959         int i;
 960
 961         if (p7si->auth_attr != NULL)
 962                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 963         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 964         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 965                 {
 966                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 967                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 968                     == NULL)
 969                         return(0);
 970                 }
 971         return(1);
 972         }
 973
 974 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 975         {
 976         int i;
 977
 978         if (p7si->unauth_attr != NULL)
 979                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 980                                            X509_ATTRIBUTE_free);
 981         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 982         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 983                 {
 984                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 985                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 986                     == NULL)
 987                         return(0);
 988                 }
 989         return(1);
 990         }
 991
 992 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 993              void *value)
 994         {
 995         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 996         }
 997
 998 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 999              void *value)
1000         {
1001         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1002         }
1003
1004 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1005                          void *value)
1006         {
1007         X509_ATTRIBUTE *attr=NULL;
1008
1009         if (*sk == NULL)
1010                 {
1011                 *sk = sk_X509_ATTRIBUTE_new_null();
1012 new_attrib:
1013                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1014                 sk_X509_ATTRIBUTE_push(*sk,attr);
1015                 }
1016         else
1017                 {
1018                 int i;
1019
1020                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1021                         {
1022                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1023                         if (OBJ_obj2nid(attr->object) == nid)
1024                                 {
1025                                 X509_ATTRIBUTE_free(attr);
1026                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1027                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1028                                 goto end;
1029                                 }
1030                         }
1031                 goto new_attrib;
1032                 }
1033 end:
1034         return(1);
1035         }
1036