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