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 int PKCS7_type_is_octet_string(PKCS7* p7)
  95         {
  96         if ( 0==PKCS7_type_is_other(p7) )
  97                 return 0;
  98
  99         return (V_ASN1_OCTET_STRING==p7->d.other->type) ? 1 : 0;
 100         }
 101
 102 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 103         {
 104         int i,j;
 105         BIO *out=NULL,*btmp=NULL;
 106         X509_ALGOR *xa;
 107         const EVP_MD *evp_md;
 108         const EVP_CIPHER *evp_cipher=NULL;
 109         STACK_OF(X509_ALGOR) *md_sk=NULL;
 110         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 111         X509_ALGOR *xalg=NULL;
 112         PKCS7_RECIP_INFO *ri=NULL;
 113         EVP_PKEY *pkey;
 114
 115         i=OBJ_obj2nid(p7->type);
 116         p7->state=PKCS7_S_HEADER;
 117
 118         switch (i)
 119                 {
 120         case NID_pkcs7_signed:
 121                 md_sk=p7->d.sign->md_algs;
 122                 break;
 123         case NID_pkcs7_signedAndEnveloped:
 124                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 125                 md_sk=p7->d.signed_and_enveloped->md_algs;
 126                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 127                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 128                 if (evp_cipher == NULL)
 129                         {
 130                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 131                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 132                         goto err;
 133                         }
 134                 break;
 135         case NID_pkcs7_enveloped:
 136                 rsk=p7->d.enveloped->recipientinfo;
 137                 xalg=p7->d.enveloped->enc_data->algorithm;
 138                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 139                 if (evp_cipher == NULL)
 140                         {
 141                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 142                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 143                         goto err;
 144                         }
 145                 break;
 146         default:
 147                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 148                 goto err;
 149                 }
 150
 151         if (md_sk != NULL)
 152                 {
 153                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 154                         {
 155                         xa=sk_X509_ALGOR_value(md_sk,i);
 156                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 157                                 {
 158                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 159                                 goto err;
 160                                 }
 161
 162                         j=OBJ_obj2nid(xa->algorithm);
 163                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 164                         if (evp_md == NULL)
 165                                 {
 166                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 167                                 goto err;
 168                                 }
 169
 170                         BIO_set_md(btmp,evp_md);
 171                         if (out == NULL)
 172                                 out=btmp;
 173                         else
 174                                 BIO_push(out,btmp);
 175                         btmp=NULL;
 176                         }
 177                 }
 178
 179         if (evp_cipher != NULL)
 180                 {
 181                 unsigned char key[EVP_MAX_KEY_LENGTH];
 182                 unsigned char iv[EVP_MAX_IV_LENGTH];
 183                 int keylen,ivlen;
 184                 int jj,max;
 185                 unsigned char *tmp;
 186                 EVP_CIPHER_CTX *ctx;
 187
 188                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 189                         {
 190                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 191                         goto err;
 192                         }
 193                 BIO_get_cipher_ctx(btmp, &ctx);
 194                 keylen=EVP_CIPHER_key_length(evp_cipher);
 195                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 196                 if (RAND_bytes(key,keylen) <= 0)
 197                         goto err;
 198                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 199                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
 200                 EVP_CipherInit_ex(ctx, evp_cipher, NULL, key, iv, 1);
 201
 202                 if (ivlen > 0) {
 203                         if (xalg->parameter == NULL)
 204                                                 xalg->parameter=ASN1_TYPE_new();
 205                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 206                                                                        goto err;
 207                 }
 208
 209                 /* Lets do the pub key stuff :-) */
 210                 max=0;
 211                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 212                         {
 213                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 214                         if (ri->cert == NULL)
 215                                 {
 216                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 217                                 goto err;
 218                                 }
 219                         pkey=X509_get_pubkey(ri->cert);
 220                         jj=EVP_PKEY_size(pkey);
 221                         EVP_PKEY_free(pkey);
 222                         if (max < jj) max=jj;
 223                         }
 224                 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
 225                         {
 226                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 227                         goto err;
 228                         }
 229                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 230                         {
 231                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 232                         pkey=X509_get_pubkey(ri->cert);
 233                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 234                         EVP_PKEY_free(pkey);
 235                         if (jj <= 0)
 236                                 {
 237                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 238                                 OPENSSL_free(tmp);
 239                                 goto err;
 240                                 }
 241                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 242                         }
 243                 OPENSSL_free(tmp);
 244                 OPENSSL_cleanse(key, keylen);
 245
 246                 if (out == NULL)
 247                         out=btmp;
 248                 else
 249                         BIO_push(out,btmp);
 250                 btmp=NULL;
 251                 }
 252
 253         if (bio == NULL) {
 254                 if (PKCS7_is_detached(p7))
 255                         bio=BIO_new(BIO_s_null());
 256                 else {
 257                         if (PKCS7_type_is_signed(p7) ) {
 258                                 if ( PKCS7_type_is_data(p7->d.sign->contents)) {
 259                                         ASN1_OCTET_STRING *os;
 260                                         os=p7->d.sign->contents->d.data;
 261                                         if (os->length > 0)
 262                                                 bio = BIO_new_mem_buf(os->data, os->length);
 263                                 }
 264                                 else if ( PKCS7_type_is_octet_string(p7->d.sign->contents) ) {
 265                                         ASN1_OCTET_STRING *os;
 266                                         os=p7->d.sign->contents->d.other->value.octet_string;
 267                                         if (os->length > 0)
 268                                                 bio = BIO_new_mem_buf(os->data, os->length);
 269                                 }
 270                         }
 271                         if(bio == NULL) {
 272                                 bio=BIO_new(BIO_s_mem());
 273                                 BIO_set_mem_eof_return(bio,0);
 274                         }
 275                 }
 276         }
 277         BIO_push(out,bio);
 278         bio=NULL;
 279         if (0)
 280                 {
 281 err:
 282                 if (out != NULL)
 283                         BIO_free_all(out);
 284                 if (btmp != NULL)
 285                         BIO_free_all(btmp);
 286                 out=NULL;
 287                 }
 288         return(out);
 289         }
 290
 291 /* int */
 292 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 293         {
 294         int i,j;
 295         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 296         unsigned char *tmp=NULL;
 297         X509_ALGOR *xa;
 298         ASN1_OCTET_STRING *data_body=NULL;
 299         const EVP_MD *evp_md;
 300         const EVP_CIPHER *evp_cipher=NULL;
 301         EVP_CIPHER_CTX *evp_ctx=NULL;
 302         X509_ALGOR *enc_alg=NULL;
 303         STACK_OF(X509_ALGOR) *md_sk=NULL;
 304         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 305         X509_ALGOR *xalg=NULL;
 306         PKCS7_RECIP_INFO *ri=NULL;
 307
 308         i=OBJ_obj2nid(p7->type);
 309         p7->state=PKCS7_S_HEADER;
 310
 311         switch (i)
 312                 {
 313         case NID_pkcs7_signed:
 314                 data_body=p7->d.sign->contents->d.data;
 315                 md_sk=p7->d.sign->md_algs;
 316                 break;
 317         case NID_pkcs7_signedAndEnveloped:
 318                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 319                 md_sk=p7->d.signed_and_enveloped->md_algs;
 320                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 321                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 322                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 323                 if (evp_cipher == NULL)
 324                         {
 325                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 326                         goto err;
 327                         }
 328                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 329                 break;
 330         case NID_pkcs7_enveloped:
 331                 rsk=p7->d.enveloped->recipientinfo;
 332                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 333                 data_body=p7->d.enveloped->enc_data->enc_data;
 334                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 335                 if (evp_cipher == NULL)
 336                         {
 337                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 338                         goto err;
 339                         }
 340                 xalg=p7->d.enveloped->enc_data->algorithm;
 341                 break;
 342         default:
 343                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 344                 goto err;
 345                 }
 346
 347         /* We will be checking the signature */
 348         if (md_sk != NULL)
 349                 {
 350                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 351                         {
 352                         xa=sk_X509_ALGOR_value(md_sk,i);
 353                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 354                                 {
 355                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 356                                 goto err;
 357                                 }
 358
 359                         j=OBJ_obj2nid(xa->algorithm);
 360                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 361                         if (evp_md == NULL)
 362                                 {
 363                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 364                                 goto err;
 365                                 }
 366
 367                         BIO_set_md(btmp,evp_md);
 368                         if (out == NULL)
 369                                 out=btmp;
 370                         else
 371                                 BIO_push(out,btmp);
 372                         btmp=NULL;
 373                         }
 374                 }
 375
 376         if (evp_cipher != NULL)
 377                 {
 378 #if 0
 379                 unsigned char key[EVP_MAX_KEY_LENGTH];
 380                 unsigned char iv[EVP_MAX_IV_LENGTH];
 381                 unsigned char *p;
 382                 int keylen,ivlen;
 383                 int max;
 384                 X509_OBJECT ret;
 385 #endif
 386                 int jj;
 387
 388                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 389                         {
 390                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 391                         goto err;
 392                         }
 393
 394                 /* It was encrypted, we need to decrypt the secret key
 395                  * with the private key */
 396
 397                 /* Find the recipientInfo which matches the passed certificate
 398                  * (if any)
 399                  */
 400
 401                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 402                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 403                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 404                                         pcert->cert_info->issuer) &&
 405                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 406                                         ri->issuer_and_serial->serial)) break;
 407                         ri=NULL;
 408                 }
 409                 if (ri == NULL) {
 410                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 411                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 412                         goto err;
 413                 }
 414
 415                 jj=EVP_PKEY_size(pkey);
 416                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
 417                 if (tmp == NULL)
 418                         {
 419                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 420                         goto err;
 421                         }
 422
 423                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 424                         M_ASN1_STRING_length(ri->enc_key), pkey);
 425                 if (jj <= 0)
 426                         {
 427                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 428                         goto err;
 429                         }
 430
 431                 evp_ctx=NULL;
 432                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 433                 EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0);
 434                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 435                         goto err;
 436
 437                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 438                         /* Some S/MIME clients don't use the same key
 439                          * and effective key length. The key length is
 440                          * determined by the size of the decrypted RSA key.
 441                          */
 442                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 443                                 {
 444                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 445                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 446                                 goto err;
 447                                 }
 448                 }
 449                 EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0);
 450
 451                 OPENSSL_cleanse(tmp,jj);
 452
 453                 if (out == NULL)
 454                         out=etmp;
 455                 else
 456                         BIO_push(out,etmp);
 457                 etmp=NULL;
 458                 }
 459
 460 #if 1
 461         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 462                 {
 463                 bio=in_bio;
 464                 }
 465         else
 466                 {
 467 #if 0
 468                 bio=BIO_new(BIO_s_mem());
 469                 /* We need to set this so that when we have read all
 470                  * the data, the encrypt BIO, if present, will read
 471                  * EOF and encode the last few bytes */
 472                 BIO_set_mem_eof_return(bio,0);
 473
 474                 if (data_body->length > 0)
 475                         BIO_write(bio,(char *)data_body->data,data_body->length);
 476 #else
 477                 if (data_body->length > 0)
 478                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 479                 else {
 480                         bio=BIO_new(BIO_s_mem());
 481                         BIO_set_mem_eof_return(bio,0);
 482                 }
 483 #endif
 484                 }
 485         BIO_push(out,bio);
 486         bio=NULL;
 487 #endif
 488         if (0)
 489                 {
 490 err:
 491                 if (out != NULL) BIO_free_all(out);
 492                 if (btmp != NULL) BIO_free_all(btmp);
 493                 if (etmp != NULL) BIO_free_all(etmp);
 494                 if (bio != NULL) BIO_free_all(bio);
 495                 out=NULL;
 496                 }
 497         if (tmp != NULL)
 498                 OPENSSL_free(tmp);
 499         return(out);
 500         }
 501
 502 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 503         {
 504         int ret=0;
 505         int i,j;
 506         BIO *btmp;
 507         BUF_MEM *buf_mem=NULL;
 508         BUF_MEM *buf=NULL;
 509         PKCS7_SIGNER_INFO *si;
 510         EVP_MD_CTX *mdc,ctx_tmp;
 511         STACK_OF(X509_ATTRIBUTE) *sk;
 512         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 513         ASN1_OCTET_STRING *os=NULL;
 514
 515         EVP_MD_CTX_init(&ctx_tmp);
 516         i=OBJ_obj2nid(p7->type);
 517         p7->state=PKCS7_S_HEADER;
 518
 519         switch (i)
 520                 {
 521         case NID_pkcs7_signedAndEnveloped:
 522                 /* XXXXXXXXXXXXXXXX */
 523                 si_sk=p7->d.signed_and_enveloped->signer_info;
 524                 os=M_ASN1_OCTET_STRING_new();
 525                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 526                 break;
 527         case NID_pkcs7_enveloped:
 528                 /* XXXXXXXXXXXXXXXX */
 529                 os=M_ASN1_OCTET_STRING_new();
 530                 p7->d.enveloped->enc_data->enc_data=os;
 531                 break;
 532         case NID_pkcs7_signed:
 533                 si_sk=p7->d.sign->signer_info;
 534                 os=p7->d.sign->contents->d.data;
 535                 /* If detached data then the content is excluded */
 536                 if(p7->detached) {
 537                         M_ASN1_OCTET_STRING_free(os);
 538                         p7->d.sign->contents->d.data = NULL;
 539                 }
 540                 break;
 541                 }
 542
 543         if (si_sk != NULL)
 544                 {
 545                 if ((buf=BUF_MEM_new()) == NULL)
 546                         {
 547                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 548                         goto err;
 549                         }
 550                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 551                         {
 552                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 553                         if (si->pkey == NULL) continue;
 554
 555                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 556
 557                         btmp=bio;
 558                         for (;;)
 559                                 {
 560                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 561                                         == NULL)
 562                                         {
 563                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 564                                         goto err;
 565                                         }
 566                                 BIO_get_md_ctx(btmp,&mdc);
 567                                 if (mdc == NULL)
 568                                         {
 569                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_INTERNAL_ERROR);
 570                                         goto err;
 571                                         }
 572                                 if (EVP_MD_CTX_type(mdc) == j)
 573                                         break;
 574                                 else
 575                                         btmp=BIO_next(btmp);
 576                                 }
 577
 578                         /* We now have the EVP_MD_CTX, lets do the
 579                          * signing. */
 580                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 581                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
 582                                 {
 583                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 584                                 goto err;
 585                                 }
 586
 587                         sk=si->auth_attr;
 588
 589                         /* If there are attributes, we add the digest
 590                          * attribute and only sign the attributes */
 591                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 592                                 {
 593                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
 594                                 unsigned int md_len, alen;
 595                                 ASN1_OCTET_STRING *digest;
 596                                 ASN1_UTCTIME *sign_time;
 597                                 const EVP_MD *md_tmp;
 598
 599                                 /* Add signing time if not already present */
 600                                 if (!PKCS7_get_signed_attribute(si,
 601                                                         NID_pkcs9_signingTime))
 602                                         {
 603                                         sign_time=X509_gmtime_adj(NULL,0);
 604                                         PKCS7_add_signed_attribute(si,
 605                                                 NID_pkcs9_signingTime,
 606                                                 V_ASN1_UTCTIME,sign_time);
 607                                         }
 608
 609                                 /* Add digest */
 610                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 611                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
 612                                 digest=M_ASN1_OCTET_STRING_new();
 613                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 614                                 PKCS7_add_signed_attribute(si,
 615                                         NID_pkcs9_messageDigest,
 616                                         V_ASN1_OCTET_STRING,digest);
 617
 618                                 /* Now sign the attributes */
 619                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
 620                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
 621                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 622                                 if(!abuf) goto err;
 623                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
 624                                 OPENSSL_free(abuf);
 625                                 }
 626
 627 #ifndef OPENSSL_NO_DSA
 628                         if (si->pkey->type == EVP_PKEY_DSA)
 629                                 ctx_tmp.digest=EVP_dss1();
 630 #endif
 631 #ifndef OPENSSL_NO_ECDSA
 632                         if (si->pkey->type == EVP_PKEY_EC)
 633                                 ctx_tmp.digest=EVP_ecdsa();
 634 #endif
 635
 636                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 637                                 (unsigned int *)&buf->length,si->pkey))
 638                                 {
 639                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 640                                 goto err;
 641                                 }
 642                         if (!ASN1_STRING_set(si->enc_digest,
 643                                 (unsigned char *)buf->data,buf->length))
 644                                 {
 645                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 646                                 goto err;
 647                                 }
 648                         }
 649                 }
 650
 651         if (!PKCS7_is_detached(p7))
 652                 {
 653                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 654                 if (btmp == NULL)
 655                         {
 656                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 657                         goto err;
 658                         }
 659                 BIO_get_mem_ptr(btmp,&buf_mem);
 660                 /* Mark the BIO read only then we can use its copy of the data
 661                  * instead of making an extra copy.
 662                  */
 663                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 664                 BIO_set_mem_eof_return(btmp, 0);
 665                 os->data = (unsigned char *)buf_mem->data;
 666                 os->length = buf_mem->length;
 667 #if 0
 668                 M_ASN1_OCTET_STRING_set(os,
 669                         (unsigned char *)buf_mem->data,buf_mem->length);
 670 #endif
 671                 }
 672         ret=1;
 673 err:
 674         EVP_MD_CTX_cleanup(&ctx_tmp);
 675         if (buf != NULL) BUF_MEM_free(buf);
 676         return(ret);
 677         }
 678
 679 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 680              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 681         {
 682         PKCS7_ISSUER_AND_SERIAL *ias;
 683         int ret=0,i;
 684         STACK_OF(X509) *cert;
 685         X509 *x509;
 686
 687         if (PKCS7_type_is_signed(p7))
 688                 {
 689                 cert=p7->d.sign->cert;
 690                 }
 691         else if (PKCS7_type_is_signedAndEnveloped(p7))
 692                 {
 693                 cert=p7->d.signed_and_enveloped->cert;
 694                 }
 695         else
 696                 {
 697                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 698                 goto err;
 699                 }
 700         /* XXXXXXXXXXXXXXXXXXXXXXX */
 701         ias=si->issuer_and_serial;
 702
 703         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 704
 705         /* were we able to find the cert in passed to us */
 706         if (x509 == NULL)
 707                 {
 708                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 709                 goto err;
 710                 }
 711
 712         /* Lets verify */
 713         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 714                 {
 715                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 716                 goto err;
 717                 }
 718         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 719         i=X509_verify_cert(ctx);
 720         if (i <= 0)
 721                 {
 722                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 723                 X509_STORE_CTX_cleanup(ctx);
 724                 goto err;
 725                 }
 726         X509_STORE_CTX_cleanup(ctx);
 727
 728         return PKCS7_signatureVerify(bio, p7, si, x509);
 729         err:
 730         return ret;
 731         }
 732
 733 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 734                                                                 X509 *x509)
 735         {
 736         ASN1_OCTET_STRING *os;
 737         EVP_MD_CTX mdc_tmp,*mdc;
 738         int ret=0,i;
 739         int md_type;
 740         STACK_OF(X509_ATTRIBUTE) *sk;
 741         BIO *btmp;
 742         EVP_PKEY *pkey;
 743
 744         EVP_MD_CTX_init(&mdc_tmp);
 745
 746         if (!PKCS7_type_is_signed(p7) &&
 747                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 748                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 749                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 750                 goto err;
 751         }
 752
 753         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 754
 755         btmp=bio;
 756         for (;;)
 757                 {
 758                 if ((btmp == NULL) ||
 759                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 760                         {
 761                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 762                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 763                         goto err;
 764                         }
 765                 BIO_get_md_ctx(btmp,&mdc);
 766                 if (mdc == NULL)
 767                         {
 768                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 769                                                         ERR_R_INTERNAL_ERROR);
 770                         goto err;
 771                         }
 772                 if (EVP_MD_CTX_type(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