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 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 105         {
 106         int i,j;
 107         BIO *out=NULL,*btmp=NULL;
 108         X509_ALGOR *xa;
 109         const EVP_MD *evp_md;
 110         const EVP_CIPHER *evp_cipher=NULL;
 111         STACK_OF(X509_ALGOR) *md_sk=NULL;
 112         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 113         X509_ALGOR *xalg=NULL;
 114         PKCS7_RECIP_INFO *ri=NULL;
 115         EVP_PKEY *pkey;
 116
 117         i=OBJ_obj2nid(p7->type);
 118         p7->state=PKCS7_S_HEADER;
 119
 120         switch (i)
 121                 {
 122         case NID_pkcs7_signed:
 123                 md_sk=p7->d.sign->md_algs;
 124                 break;
 125         case NID_pkcs7_signedAndEnveloped:
 126                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 127                 md_sk=p7->d.signed_and_enveloped->md_algs;
 128                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 129                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 130                 if (evp_cipher == NULL)
 131                         {
 132                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 133                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 134                         goto err;
 135                         }
 136                 break;
 137         case NID_pkcs7_enveloped:
 138                 rsk=p7->d.enveloped->recipientinfo;
 139                 xalg=p7->d.enveloped->enc_data->algorithm;
 140                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 141                 if (evp_cipher == NULL)
 142                         {
 143                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 144                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 145                         goto err;
 146                         }
 147                 break;
 148         default:
 149                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 150                 goto err;
 151                 }
 152
 153         if (md_sk != NULL)
 154                 {
 155                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 156                         {
 157                         xa=sk_X509_ALGOR_value(md_sk,i);
 158                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 159                                 {
 160                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 161                                 goto err;
 162                                 }
 163
 164                         j=OBJ_obj2nid(xa->algorithm);
 165                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 166                         if (evp_md == NULL)
 167                                 {
 168                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 169                                 goto err;
 170                                 }
 171
 172                         BIO_set_md(btmp,evp_md);
 173                         if (out == NULL)
 174                                 out=btmp;
 175                         else
 176                                 BIO_push(out,btmp);
 177                         btmp=NULL;
 178                         }
 179                 }
 180
 181         if (evp_cipher != NULL)
 182                 {
 183                 unsigned char key[EVP_MAX_KEY_LENGTH];
 184                 unsigned char iv[EVP_MAX_IV_LENGTH];
 185                 int keylen,ivlen;
 186                 int jj,max;
 187                 unsigned char *tmp;
 188                 EVP_CIPHER_CTX *ctx;
 189
 190                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 191                         {
 192                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 193                         goto err;
 194                         }
 195                 BIO_get_cipher_ctx(btmp, &ctx);
 196                 keylen=EVP_CIPHER_key_length(evp_cipher);
 197                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 198                 if (RAND_bytes(key,keylen) <= 0)
 199                         goto err;
 200                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 201                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
 202                 EVP_CipherInit_ex(ctx, evp_cipher, NULL, key, iv, 1);
 203
 204                 if (ivlen > 0) {
 205                         if (xalg->parameter == NULL)
 206                                                 xalg->parameter=ASN1_TYPE_new();
 207                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 208                                                                        goto err;
 209                 }
 210
 211                 /* Lets do the pub key stuff :-) */
 212                 max=0;
 213                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 214                         {
 215                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 216                         if (ri->cert == NULL)
 217                                 {
 218                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 219                                 goto err;
 220                                 }
 221                         pkey=X509_get_pubkey(ri->cert);
 222                         jj=EVP_PKEY_size(pkey);
 223                         EVP_PKEY_free(pkey);
 224                         if (max < jj) max=jj;
 225                         }
 226                 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
 227                         {
 228                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 229                         goto err;
 230                         }
 231                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 232                         {
 233                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 234                         pkey=X509_get_pubkey(ri->cert);
 235                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 236                         EVP_PKEY_free(pkey);
 237                         if (jj <= 0)
 238                                 {
 239                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 240                                 OPENSSL_free(tmp);
 241                                 goto err;
 242                                 }
 243                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 244                         }
 245                 OPENSSL_free(tmp);
 246                 OPENSSL_cleanse(key, keylen);
 247
 248                 if (out == NULL)
 249                         out=btmp;
 250                 else
 251                         BIO_push(out,btmp);
 252                 btmp=NULL;
 253                 }
 254
 255         if (bio == NULL)
 256                 {
 257                 if (PKCS7_is_detached(p7))
 258                         bio=BIO_new(BIO_s_null());
 259                 else
 260                         {
 261                         ASN1_OCTET_STRING *os;
 262                         os = PKCS7_get_octet_string(p7->d.sign->contents);
 263                         if (os && os->length > 0)
 264                                 bio = BIO_new_mem_buf(os->data, os->length);
 265                         if(bio == NULL)
 266                                 {
 267                                 bio=BIO_new(BIO_s_mem());
 268                                 BIO_set_mem_eof_return(bio,0);
 269                                 }
 270                         }
 271         }
 272         BIO_push(out,bio);
 273         bio=NULL;
 274         if (0)
 275                 {
 276 err:
 277                 if (out != NULL)
 278                         BIO_free_all(out);
 279                 if (btmp != NULL)
 280                         BIO_free_all(btmp);
 281                 out=NULL;
 282                 }
 283         return(out);
 284         }
 285
 286 /* int */
 287 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 288         {
 289         int i,j;
 290         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 291         unsigned char *tmp=NULL;
 292         X509_ALGOR *xa;
 293         ASN1_OCTET_STRING *data_body=NULL;
 294         const EVP_MD *evp_md;
 295         const EVP_CIPHER *evp_cipher=NULL;
 296         EVP_CIPHER_CTX *evp_ctx=NULL;
 297         X509_ALGOR *enc_alg=NULL;
 298         STACK_OF(X509_ALGOR) *md_sk=NULL;
 299         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 300         X509_ALGOR *xalg=NULL;
 301         PKCS7_RECIP_INFO *ri=NULL;
 302
 303         i=OBJ_obj2nid(p7->type);
 304         p7->state=PKCS7_S_HEADER;
 305
 306         switch (i)
 307                 {
 308         case NID_pkcs7_signed:
 309                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 310                 md_sk=p7->d.sign->md_algs;
 311                 break;
 312         case NID_pkcs7_signedAndEnveloped:
 313                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 314                 md_sk=p7->d.signed_and_enveloped->md_algs;
 315                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 316                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 317                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 318                 if (evp_cipher == NULL)
 319                         {
 320                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 321                         goto err;
 322                         }
 323                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 324                 break;
 325         case NID_pkcs7_enveloped:
 326                 rsk=p7->d.enveloped->recipientinfo;
 327                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 328                 data_body=p7->d.enveloped->enc_data->enc_data;
 329                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 330                 if (evp_cipher == NULL)
 331                         {
 332                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 333                         goto err;
 334                         }
 335                 xalg=p7->d.enveloped->enc_data->algorithm;
 336                 break;
 337         default:
 338                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 339                 goto err;
 340                 }
 341
 342         /* We will be checking the signature */
 343         if (md_sk != NULL)
 344                 {
 345                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 346                         {
 347                         xa=sk_X509_ALGOR_value(md_sk,i);
 348                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 349                                 {
 350                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 351                                 goto err;
 352                                 }
 353
 354                         j=OBJ_obj2nid(xa->algorithm);
 355                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 356                         if (evp_md == NULL)
 357                                 {
 358                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 359                                 goto err;
 360                                 }
 361
 362                         BIO_set_md(btmp,evp_md);
 363                         if (out == NULL)
 364                                 out=btmp;
 365                         else
 366                                 BIO_push(out,btmp);
 367                         btmp=NULL;
 368                         }
 369                 }
 370
 371         if (evp_cipher != NULL)
 372                 {
 373 #if 0
 374                 unsigned char key[EVP_MAX_KEY_LENGTH];
 375                 unsigned char iv[EVP_MAX_IV_LENGTH];
 376                 unsigned char *p;
 377                 int keylen,ivlen;
 378                 int max;
 379                 X509_OBJECT ret;
 380 #endif
 381                 int jj;
 382
 383                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 384                         {
 385                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 386                         goto err;
 387                         }
 388
 389                 /* It was encrypted, we need to decrypt the secret key
 390                  * with the private key */
 391
 392                 /* Find the recipientInfo which matches the passed certificate
 393                  * (if any)
 394                  */
 395
 396                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 397                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 398                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 399                                         pcert->cert_info->issuer) &&
 400                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 401                                         ri->issuer_and_serial->serial)) break;
 402                         ri=NULL;
 403                 }
 404                 if (ri == NULL) {
 405                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 406                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 407                         goto err;
 408                 }
 409
 410                 jj=EVP_PKEY_size(pkey);
 411                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
 412                 if (tmp == NULL)
 413                         {
 414                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 415                         goto err;
 416                         }
 417
 418                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 419                         M_ASN1_STRING_length(ri->enc_key), pkey);
 420                 if (jj <= 0)
 421                         {
 422                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 423                         goto err;
 424                         }
 425
 426                 evp_ctx=NULL;
 427                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 428                 EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0);
 429                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 430                         goto err;
 431
 432                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 433                         /* Some S/MIME clients don't use the same key
 434                          * and effective key length. The key length is
 435                          * determined by the size of the decrypted RSA key.
 436                          */
 437                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 438                                 {
 439                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 440                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 441                                 goto err;
 442                                 }
 443                 }
 444                 EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0);
 445
 446                 OPENSSL_cleanse(tmp,jj);
 447
 448                 if (out == NULL)
 449                         out=etmp;
 450                 else
 451                         BIO_push(out,etmp);
 452                 etmp=NULL;
 453                 }
 454
 455 #if 1
 456         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 457                 {
 458                 bio=in_bio;
 459                 }
 460         else
 461                 {
 462 #if 0
 463                 bio=BIO_new(BIO_s_mem());
 464                 /* We need to set this so that when we have read all
 465                  * the data, the encrypt BIO, if present, will read
 466                  * EOF and encode the last few bytes */
 467                 BIO_set_mem_eof_return(bio,0);
 468
 469                 if (data_body->length > 0)
 470                         BIO_write(bio,(char *)data_body->data,data_body->length);
 471 #else
 472                 if (data_body->length > 0)
 473                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 474                 else {
 475                         bio=BIO_new(BIO_s_mem());
 476                         BIO_set_mem_eof_return(bio,0);
 477                 }
 478 #endif
 479                 }
 480         BIO_push(out,bio);
 481         bio=NULL;
 482 #endif
 483         if (0)
 484                 {
 485 err:
 486                 if (out != NULL) BIO_free_all(out);
 487                 if (btmp != NULL) BIO_free_all(btmp);
 488                 if (etmp != NULL) BIO_free_all(etmp);
 489                 if (bio != NULL) BIO_free_all(bio);
 490                 out=NULL;
 491                 }
 492         if (tmp != NULL)
 493                 OPENSSL_free(tmp);
 494         return(out);
 495         }
 496
 497 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 498         {
 499         int ret=0;
 500         int i,j;
 501         BIO *btmp;
 502         BUF_MEM *buf_mem=NULL;
 503         BUF_MEM *buf=NULL;
 504         PKCS7_SIGNER_INFO *si;
 505         EVP_MD_CTX *mdc,ctx_tmp;
 506         STACK_OF(X509_ATTRIBUTE) *sk;
 507         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 508         ASN1_OCTET_STRING *os=NULL;
 509
 510         EVP_MD_CTX_init(&ctx_tmp);
 511         i=OBJ_obj2nid(p7->type);
 512         p7->state=PKCS7_S_HEADER;
 513
 514         switch (i)
 515                 {
 516         case NID_pkcs7_signedAndEnveloped:
 517                 /* XXXXXXXXXXXXXXXX */
 518                 si_sk=p7->d.signed_and_enveloped->signer_info;
 519                 os=M_ASN1_OCTET_STRING_new();
 520                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 521                 break;
 522         case NID_pkcs7_enveloped:
 523                 /* XXXXXXXXXXXXXXXX */
 524                 os=M_ASN1_OCTET_STRING_new();
 525                 p7->d.enveloped->enc_data->enc_data=os;
 526                 break;
 527         case NID_pkcs7_signed:
 528                 si_sk=p7->d.sign->signer_info;
 529                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 530                 /* If detached data then the content is excluded */
 531                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 532                         M_ASN1_OCTET_STRING_free(os);
 533                         p7->d.sign->contents->d.data = NULL;
 534                 }
 535                 break;
 536                 }
 537
 538         if (si_sk != NULL)
 539                 {
 540                 if ((buf=BUF_MEM_new()) == NULL)
 541                         {
 542                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 543                         goto err;
 544                         }
 545                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 546                         {
 547                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 548                         if (si->pkey == NULL) continue;
 549
 550                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 551
 552                         btmp=bio;
 553                         for (;;)
 554                                 {
 555                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 556                                         == NULL)
 557                                         {
 558                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 559                                         goto err;
 560                                         }
 561                                 BIO_get_md_ctx(btmp,&mdc);
 562                                 if (mdc == NULL)
 563                                         {
 564                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_INTERNAL_ERROR);
 565                                         goto err;
 566                                         }
 567                                 if (EVP_MD_CTX_type(mdc) == j)
 568                                         break;
 569                                 else
 570                                         btmp=BIO_next(btmp);
 571                                 }
 572
 573                         /* We now have the EVP_MD_CTX, lets do the
 574                          * signing. */
 575                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 576                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
 577                                 {
 578                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 579                                 goto err;
 580                                 }
 581
 582                         sk=si->auth_attr;
 583
 584                         /* If there are attributes, we add the digest
 585                          * attribute and only sign the attributes */
 586                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 587                                 {
 588                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
 589                                 unsigned int md_len, alen;
 590                                 ASN1_OCTET_STRING *digest;
 591                                 ASN1_UTCTIME *sign_time;
 592                                 const EVP_MD *md_tmp;
 593
 594                                 /* Add signing time if not already present */
 595                                 if (!PKCS7_get_signed_attribute(si,
 596                                                         NID_pkcs9_signingTime))
 597                                         {
 598                                         sign_time=X509_gmtime_adj(NULL,0);
 599                                         PKCS7_add_signed_attribute(si,
 600                                                 NID_pkcs9_signingTime,
 601                                                 V_ASN1_UTCTIME,sign_time);
 602                                         }
 603
 604                                 /* Add digest */
 605                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 606                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
 607                                 digest=M_ASN1_OCTET_STRING_new();
 608                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 609                                 PKCS7_add_signed_attribute(si,
 610                                         NID_pkcs9_messageDigest,
 611                                         V_ASN1_OCTET_STRING,digest);
 612
 613                                 /* Now sign the attributes */
 614                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
 615                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
 616                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 617                                 if(!abuf) goto err;
 618                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
 619                                 OPENSSL_free(abuf);
 620                                 }
 621
 622 #ifndef OPENSSL_NO_DSA
 623                         if (si->pkey->type == EVP_PKEY_DSA)
 624                                 ctx_tmp.digest=EVP_dss1();
 625 #endif
 626 #ifndef OPENSSL_NO_ECDSA
 627                         if (si->pkey->type == EVP_PKEY_EC)
 628                                 ctx_tmp.digest=EVP_ecdsa();
 629 #endif
 630
 631                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 632                                 (unsigned int *)&buf->length,si->pkey))
 633                                 {
 634                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 635                                 goto err;
 636                                 }
 637                         if (!ASN1_STRING_set(si->enc_digest,
 638                                 (unsigned char *)buf->data,buf->length))
 639                                 {
 640                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 641                                 goto err;
 642                                 }
 643                         }
 644                 }
 645
 646         if (!PKCS7_is_detached(p7))
 647                 {
 648                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 649                 if (btmp == NULL)
 650                         {
 651                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 652                         goto err;
 653                         }
 654                 BIO_get_mem_ptr(btmp,&buf_mem);
 655                 /* Mark the BIO read only then we can use its copy of the data
 656                  * instead of making an extra copy.
 657                  */
 658                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 659                 BIO_set_mem_eof_return(btmp, 0);
 660                 os->data = (unsigned char *)buf_mem->data;
 661                 os->length = buf_mem->length;
 662 #if 0
 663                 M_ASN1_OCTET_STRING_set(os,
 664                         (unsigned char *)buf_mem->data,buf_mem->length);
 665 #endif
 666                 }
 667         ret=1;
 668 err:
 669         EVP_MD_CTX_cleanup(&ctx_tmp);
 670         if (buf != NULL) BUF_MEM_free(buf);
 671         return(ret);
 672         }
 673
 674 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 675              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 676         {
 677         PKCS7_ISSUER_AND_SERIAL *ias;
 678         int ret=0,i;
 679         STACK_OF(X509) *cert;
 680         X509 *x509;
 681
 682         if (PKCS7_type_is_signed(p7))
 683                 {
 684                 cert=p7->d.sign->cert;
 685                 }
 686         else if (PKCS7_type_is_signedAndEnveloped(p7))
 687                 {
 688                 cert=p7->d.signed_and_enveloped->cert;
 689                 }
 690         else
 691                 {
 692                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 693                 goto err;
 694                 }
 695         /* XXXXXXXXXXXXXXXXXXXXXXX */
 696         ias=si->issuer_and_serial;
 697
 698         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 699
 700         /* were we able to find the cert in passed to us */
 701         if (x509 == NULL)
 702                 {
 703                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 704                 goto err;
 705                 }
 706
 707         /* Lets verify */
 708         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 709                 {
 710                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 711                 goto err;
 712                 }
 713         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 714         i=X509_verify_cert(ctx);
 715         if (i <= 0)
 716                 {
 717                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 718                 X509_STORE_CTX_cleanup(ctx);
 719                 goto err;
 720                 }
 721         X509_STORE_CTX_cleanup(ctx);
 722
 723         return PKCS7_signatureVerify(bio, p7, si, x509);
 724         err:
 725         return ret;
 726         }
 727
 728 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 729                                                                 X509 *x509)
 730         {
 731         ASN1_OCTET_STRING *os;
 732         EVP_MD_CTX mdc_tmp,*mdc;
 733         int ret=0,i;
 734         int md_type;
 735         STACK_OF(X509_ATTRIBUTE) *sk;
 736         BIO *btmp;
 737         EVP_PKEY *pkey;
 738
 739         EVP_MD_CTX_init(&mdc_tmp);
 740
 741         if (!PKCS7_type_is_signed(p7) &&
 742                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 743                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 744                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 745                 goto err;
 746         }
 747
 748         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 749
 750         btmp=bio;
 751         for (;;)
 752                 {
 753                 if ((btmp == NULL) ||
 754                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 755                         {
 756                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 757                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 758                         goto err;
 759                         }
 760                 BIO_get_md_ctx(btmp,&mdc);
 761                 if (mdc == NULL)
 762                         {
 763                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 764                                                         ERR_R_INTERNAL_ERROR);
 765                         goto err;
 766                         }
 767                 if (EVP_MD_CTX_type(mdc) == md_type)
 768                         break;
 769                 /* Workaround for some broken clients that put the signature
 770                  * OID instead of the digest OID in digest_alg->algorithm
 771                  */
 772                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
 773                         break;
 774                 btmp=BIO_next(btmp);
 775                 }
 776
 777         /* mdc is the digest ctx that we want, unless there are attributes,
 778          * in which case the digest is the signed attributes */
 779         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
 780
 781         sk=si->auth_attr;
 782         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 783                 {
 784                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
 785                 unsigned int md_len, alen;
 786                 ASN1_OCTET_STRING *message_digest;
 787
 788                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
 789                 message_digest=PKCS7_digest_from_attributes(sk);
 790                 if (!message_digest)
 791                         {
 792                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 793                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 794                         goto err;
 795                         }
 796                 if ((message_digest->length != (int)md_len) ||
 797                         (memcmp(message_digest->data,md_dat,md_len)))
 798                         {
 799 #if 0
 800 {
 801 int ii;
 802 for (ii=0; ii<message_digest->length; ii++)
 803         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 804 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 805 }
 806 #endif
 807                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 808                                                         PKCS7_R_DIGEST_FAILURE);
 809                         ret= -1;
 810                         goto err;
 811                         }
 812
 813                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
 814
 815                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
 816                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
 817                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
 818
 819                 OPENSSL_free(abuf);
 820                 }
 821
 822         os=si->enc_digest;
 823         pkey = X509_get_pubkey(x509);
 824         if (!pkey)
 825                 {
 826                 ret = -1;
 827                 goto err;
 828                 }
 829 #ifndef OPENSSL_NO_DSA
 830         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 831 #endif
 832 #ifndef OPENSSL_NO_ECDSA
 833         if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
 834 #endif
 835
 836         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 837         EVP_PKEY_free(pkey);
 838         if (i <= 0)
 839                 {
 840                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 841                                                 PKCS7_R_SIGNATURE_FAILURE);
 842                 ret= -1;
 843                 goto err;
 844                 }
 845         else
 846                 ret=1;
 847 err:
 848         EVP_MD_CTX_cleanup(&mdc_tmp);
 849         return(ret);
 850         }
 851
 852 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 853         {
 854         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 855         PKCS7_RECIP_INFO *ri;
 856         int i;
 857
 858         i=OBJ_obj2nid(p7->type);
 859         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 860         rsk=p7->d.signed_and_enveloped->recipientinfo;
 861         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 862         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 863         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 864         return(ri->issuer_and_serial);
 865         }
 866
 867 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 868         {
 869         return(get_attribute(si->auth_attr,nid));
 870         }
 871
 872 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 873         {
 874         return(get_attribute(si->unauth_attr,nid));
 875         }
 876
 877 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 878         {
 879         int i;
 880         X509_ATTRIBUTE *xa;
 881         ASN1_OBJECT *o;
 882
 883         o=OBJ_nid2obj(nid);
 884         if (!o || !sk) return(NULL);
 885         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 886                 {
 887                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 888                 if (OBJ_cmp(xa->object,o) == 0)
 889                         {
 890                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
 891                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 892                         else
 893                                 return(NULL);
 894                         }
 895                 }
 896         return(NULL);
 897         }
 898
 899 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 900 {
 901         ASN1_TYPE *astype;
 902         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 903         return astype->value.octet_string;
 904 }
 905
 906 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 907                                 STACK_OF(X509_ATTRIBUTE) *sk)
 908         {
 909         int i;
 910
 911         if (p7si->auth_attr != NULL)
 912                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 913         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 914         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 915                 {
 916                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 917                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 918                     == NULL)
 919                         return(0);
 920                 }
 921         return(1);
 922         }
 923
 924 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 925         {
 926         int i;
 927
 928         if (p7si->unauth_attr != NULL)
 929                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 930                                            X509_ATTRIBUTE_free);
 931         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 932         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 933                 {
 934                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 935                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 936                     == NULL)
 937                         return(0);
 938                 }
 939         return(1);
 940         }
 941
 942 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 943              void *value)
 944         {
 945         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 946         }
 947
 948 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 949              void *value)
 950         {
 951         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 952         }
 953
 954 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 955                          void *value)
 956         {
 957         X509_ATTRIBUTE *attr=NULL;
 958
 959         if (*sk == NULL)
 960                 {
 961                 *sk = sk_X509_ATTRIBUTE_new_null();
 962 new_attrib:
 963                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 964                 sk_X509_ATTRIBUTE_push(*sk,attr);
 965                 }
 966         else
 967                 {
 968                 int i;
 969
 970                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 971                         {
 972                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 973                         if (OBJ_obj2nid(attr->object) == nid)
 974                                 {
 975                                 X509_ATTRIBUTE_free(attr);
 976                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 977                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 978                                 goto end;
 979                                 }
 980                         }
 981                 goto new_attrib;
 982                 }
 983 end:
 984         return(1);
 985         }
 986