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