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 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
  71         {
  72         int i,j;
  73         BIO *out=NULL,*btmp=NULL;
  74         X509_ALGOR *xa;
  75         const EVP_MD *evp_md;
  76         const EVP_CIPHER *evp_cipher=NULL;
  77         STACK_OF(X509_ALGOR) *md_sk=NULL;
  78         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
  79         X509_ALGOR *xalg=NULL;
  80         PKCS7_RECIP_INFO *ri=NULL;
  81         EVP_PKEY *pkey;
  82
  83         i=OBJ_obj2nid(p7->type);
  84         p7->state=PKCS7_S_HEADER;
  85
  86         switch (i)
  87                 {
  88         case NID_pkcs7_signed:
  89                 md_sk=p7->d.sign->md_algs;
  90                 break;
  91         case NID_pkcs7_signedAndEnveloped:
  92                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  93                 md_sk=p7->d.signed_and_enveloped->md_algs;
  94                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  95                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
  96                 if (evp_cipher == NULL)
  97                         {
  98                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
  99                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 100                         goto err;
 101                         }
 102                 break;
 103         case NID_pkcs7_enveloped:
 104                 rsk=p7->d.enveloped->recipientinfo;
 105                 xalg=p7->d.enveloped->enc_data->algorithm;
 106                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 107                 if (evp_cipher == NULL)
 108                         {
 109                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 110                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 111                         goto err;
 112                         }
 113                 break;
 114         default:
 115                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 116                 goto err;
 117                 }
 118
 119         if (md_sk != NULL)
 120                 {
 121                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 122                         {
 123                         xa=sk_X509_ALGOR_value(md_sk,i);
 124                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 125                                 {
 126                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 127                                 goto err;
 128                                 }
 129
 130                         j=OBJ_obj2nid(xa->algorithm);
 131                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 132                         if (evp_md == NULL)
 133                                 {
 134                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 135                                 goto err;
 136                                 }
 137
 138                         BIO_set_md(btmp,evp_md);
 139                         if (out == NULL)
 140                                 out=btmp;
 141                         else
 142                                 BIO_push(out,btmp);
 143                         btmp=NULL;
 144                         }
 145                 }
 146
 147         if (evp_cipher != NULL)
 148                 {
 149                 unsigned char key[EVP_MAX_KEY_LENGTH];
 150                 unsigned char iv[EVP_MAX_IV_LENGTH];
 151                 int keylen,ivlen;
 152                 int jj,max;
 153                 unsigned char *tmp;
 154                 EVP_CIPHER_CTX *ctx;
 155
 156                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 157                         {
 158                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 159                         goto err;
 160                         }
 161                 BIO_get_cipher_ctx(btmp, &ctx);
 162                 keylen=EVP_CIPHER_key_length(evp_cipher);
 163                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 164                 if (RAND_bytes(key,keylen) <= 0)
 165                         goto err;
 166                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 167                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
 168                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
 169
 170                 if (ivlen > 0) {
 171                         if (xalg->parameter == NULL)
 172                                                 xalg->parameter=ASN1_TYPE_new();
 173                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 174                                                                        goto err;
 175                 }
 176
 177                 /* Lets do the pub key stuff :-) */
 178                 max=0;
 179                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 180                         {
 181                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 182                         if (ri->cert == NULL)
 183                                 {
 184                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 185                                 goto err;
 186                                 }
 187                         pkey=X509_get_pubkey(ri->cert);
 188                         jj=EVP_PKEY_size(pkey);
 189                         EVP_PKEY_free(pkey);
 190                         if (max < jj) max=jj;
 191                         }
 192                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 193                         {
 194                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 195                         goto err;
 196                         }
 197                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 198                         {
 199                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 200                         pkey=X509_get_pubkey(ri->cert);
 201                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 202                         EVP_PKEY_free(pkey);
 203                         if (jj <= 0)
 204                                 {
 205                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 206                                 Free(tmp);
 207                                 goto err;
 208                                 }
 209                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 210                         }
 211                 Free(tmp);
 212                 memset(key, 0, keylen);
 213
 214                 if (out == NULL)
 215                         out=btmp;
 216                 else
 217                         BIO_push(out,btmp);
 218                 btmp=NULL;
 219                 }
 220
 221         if (bio == NULL) {
 222                 if (p7->detached)
 223                         bio=BIO_new(BIO_s_null());
 224                 else {
 225                         if (PKCS7_type_is_signed(p7) &&
 226                                 PKCS7_type_is_data(p7->d.sign->contents)) {
 227                                 ASN1_OCTET_STRING *os;
 228                                 os=p7->d.sign->contents->d.data;
 229                                 if (os->length > 0) bio =
 230                                         BIO_new_mem_buf(os->data, os->length);
 231                         }
 232                         if(bio == NULL) {
 233                                 bio=BIO_new(BIO_s_mem());
 234                                 BIO_set_mem_eof_return(bio,0);
 235                         }
 236                 }
 237         }
 238         BIO_push(out,bio);
 239         bio=NULL;
 240         if (0)
 241                 {
 242 err:
 243                 if (out != NULL)
 244                         BIO_free_all(out);
 245                 if (btmp != NULL)
 246                         BIO_free_all(btmp);
 247                 out=NULL;
 248                 }
 249         return(out);
 250         }
 251
 252 /* int */
 253 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 254         {
 255         int i,j;
 256         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 257         unsigned char *tmp=NULL;
 258         X509_ALGOR *xa;
 259         ASN1_OCTET_STRING *data_body=NULL;
 260         const EVP_MD *evp_md;
 261         const EVP_CIPHER *evp_cipher=NULL;
 262         EVP_CIPHER_CTX *evp_ctx=NULL;
 263         X509_ALGOR *enc_alg=NULL;
 264         STACK_OF(X509_ALGOR) *md_sk=NULL;
 265         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 266         X509_ALGOR *xalg=NULL;
 267         PKCS7_RECIP_INFO *ri=NULL;
 268
 269         i=OBJ_obj2nid(p7->type);
 270         p7->state=PKCS7_S_HEADER;
 271
 272         switch (i)
 273                 {
 274         case NID_pkcs7_signed:
 275                 data_body=p7->d.sign->contents->d.data;
 276                 md_sk=p7->d.sign->md_algs;
 277                 break;
 278         case NID_pkcs7_signedAndEnveloped:
 279                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 280                 md_sk=p7->d.signed_and_enveloped->md_algs;
 281                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 282                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 283                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 284                 if (evp_cipher == NULL)
 285                         {
 286                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 287                         goto err;
 288                         }
 289                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 290                 break;
 291         case NID_pkcs7_enveloped:
 292                 rsk=p7->d.enveloped->recipientinfo;
 293                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 294                 data_body=p7->d.enveloped->enc_data->enc_data;
 295                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 296                 if (evp_cipher == NULL)
 297                         {
 298                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 299                         goto err;
 300                         }
 301                 xalg=p7->d.enveloped->enc_data->algorithm;
 302                 break;
 303         default:
 304                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 305                 goto err;
 306                 }
 307
 308         /* We will be checking the signature */
 309         if (md_sk != NULL)
 310                 {
 311                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 312                         {
 313                         xa=sk_X509_ALGOR_value(md_sk,i);
 314                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 315                                 {
 316                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 317                                 goto err;
 318                                 }
 319
 320                         j=OBJ_obj2nid(xa->algorithm);
 321                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 322                         if (evp_md == NULL)
 323                                 {
 324                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 325                                 goto err;
 326                                 }
 327
 328                         BIO_set_md(btmp,evp_md);
 329                         if (out == NULL)
 330                                 out=btmp;
 331                         else
 332                                 BIO_push(out,btmp);
 333                         btmp=NULL;
 334                         }
 335                 }
 336
 337         if (evp_cipher != NULL)
 338                 {
 339 #if 0
 340                 unsigned char key[EVP_MAX_KEY_LENGTH];
 341                 unsigned char iv[EVP_MAX_IV_LENGTH];
 342                 unsigned char *p;
 343                 int keylen,ivlen;
 344                 int max;
 345                 X509_OBJECT ret;
 346 #endif
 347                 int jj;
 348
 349                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 350                         {
 351                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 352                         goto err;
 353                         }
 354
 355                 /* It was encrypted, we need to decrypt the secret key
 356                  * with the private key */
 357
 358                 /* Find the recipientInfo which matches the passed certificate
 359                  * (if any)
 360                  */
 361
 362                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 363                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 364                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 365                                         pcert->cert_info->issuer) &&
 366                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 367                                         ri->issuer_and_serial->serial)) break;
 368                         ri=NULL;
 369                 }
 370                 if (ri == NULL) {
 371                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 372                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 373                         return(NULL);
 374                 }
 375
 376                 jj=EVP_PKEY_size(pkey);
 377                 tmp=(unsigned char *)Malloc(jj+10);
 378                 if (tmp == NULL)
 379                         {
 380                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 381                         goto err;
 382                         }
 383
 384                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 385                         M_ASN1_STRING_length(ri->enc_key), pkey);
 386                 if (jj <= 0)
 387                         {
 388                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 389                         goto err;
 390                         }
 391
 392                 evp_ctx=NULL;
 393                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 394                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 395                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 396                         return(NULL);
 397
 398                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 399                         /* Some S/MIME clients don't use the same key
 400                          * and effective key length. The key length is
 401                          * determined by the size of the decrypted RSA key.
 402                          */
 403                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 404                                 {
 405                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 406                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 407                                 goto err;
 408                                 }
 409                 }
 410                 EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
 411
 412                 memset(tmp,0,jj);
 413
 414                 if (out == NULL)
 415                         out=etmp;
 416                 else
 417                         BIO_push(out,etmp);
 418                 etmp=NULL;
 419                 }
 420
 421 #if 1
 422         if (p7->detached || (in_bio != NULL))
 423                 {
 424                 bio=in_bio;
 425                 }
 426         else
 427                 {
 428 #if 0
 429                 bio=BIO_new(BIO_s_mem());
 430                 /* We need to set this so that when we have read all
 431                  * the data, the encrypt BIO, if present, will read
 432                  * EOF and encode the last few bytes */
 433                 BIO_set_mem_eof_return(bio,0);
 434
 435                 if (data_body->length > 0)
 436                         BIO_write(bio,(char *)data_body->data,data_body->length);
 437 #else
 438                 if (data_body->length > 0)
 439                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 440                 else {
 441                         bio=BIO_new(BIO_s_mem());
 442                         BIO_set_mem_eof_return(bio,0);
 443                 }
 444 #endif
 445                 }
 446         BIO_push(out,bio);
 447         bio=NULL;
 448 #endif
 449         if (0)
 450                 {
 451 err:
 452                 if (out != NULL) BIO_free_all(out);
 453                 if (btmp != NULL) BIO_free_all(btmp);
 454                 if (etmp != NULL) BIO_free_all(etmp);
 455                 if (bio != NULL) BIO_free_all(bio);
 456                 out=NULL;
 457                 }
 458         if (tmp != NULL)
 459                 Free(tmp);
 460         return(out);
 461         }
 462
 463 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 464         {
 465         int ret=0;
 466         int i,j;
 467         BIO *btmp;
 468         BUF_MEM *buf_mem=NULL;
 469         BUF_MEM *buf=NULL;
 470         PKCS7_SIGNER_INFO *si;
 471         EVP_MD_CTX *mdc,ctx_tmp;
 472         STACK_OF(X509_ATTRIBUTE) *sk;
 473         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 474         unsigned char *p,*pp=NULL;
 475         int x;
 476         ASN1_OCTET_STRING *os=NULL;
 477
 478         i=OBJ_obj2nid(p7->type);
 479         p7->state=PKCS7_S_HEADER;
 480
 481         switch (i)
 482                 {
 483         case NID_pkcs7_signedAndEnveloped:
 484                 /* XXXXXXXXXXXXXXXX */
 485                 si_sk=p7->d.signed_and_enveloped->signer_info;
 486                 os=M_ASN1_OCTET_STRING_new();
 487                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 488                 break;
 489         case NID_pkcs7_enveloped:
 490                 /* XXXXXXXXXXXXXXXX */
 491                 os=M_ASN1_OCTET_STRING_new();
 492                 p7->d.enveloped->enc_data->enc_data=os;
 493                 break;
 494         case NID_pkcs7_signed:
 495                 si_sk=p7->d.sign->signer_info;
 496                 os=p7->d.sign->contents->d.data;
 497                 /* If detached data then the content is excluded */
 498                 if(p7->detached) {
 499                         M_ASN1_OCTET_STRING_free(os);
 500                         p7->d.sign->contents->d.data = NULL;
 501                 }
 502                 break;
 503                 }
 504
 505         if (si_sk != NULL)
 506                 {
 507                 if ((buf=BUF_MEM_new()) == NULL)
 508                         {
 509                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 510                         goto err;
 511                         }
 512                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 513                         {
 514                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 515                         if (si->pkey == NULL) continue;
 516
 517                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 518
 519                         btmp=bio;
 520                         for (;;)
 521                                 {
 522                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 523                                         == NULL)
 524                                         {
 525                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 526                                         goto err;
 527                                         }
 528                                 BIO_get_md_ctx(btmp,&mdc);
 529                                 if (mdc == NULL)
 530                                         {
 531                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 532                                         goto err;
 533                                         }
 534                                 if (EVP_MD_CTX_type(mdc) == j)
 535                                         break;
 536                                 else
 537                                         btmp=btmp->next_bio;
 538                                 }
 539
 540                         /* We now have the EVP_MD_CTX, lets do the
 541                          * signing. */
 542                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 543                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 544                                 {
 545                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 546                                 goto err;
 547                                 }
 548
 549                         sk=si->auth_attr;
 550
 551                         /* If there are attributes, we add the digest
 552                          * attribute and only sign the attributes */
 553                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 554                                 {
 555                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 556                                 unsigned int md_len;
 557                                 ASN1_OCTET_STRING *digest;
 558                                 ASN1_UTCTIME *sign_time;
 559                                 const EVP_MD *md_tmp;
 560
 561                                 /* Add signing time */
 562                                 sign_time=X509_gmtime_adj(NULL,0);
 563                                 PKCS7_add_signed_attribute(si,
 564                                         NID_pkcs9_signingTime,
 565                                         V_ASN1_UTCTIME,sign_time);
 566
 567                                 /* Add digest */
 568                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 569                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 570                                 digest=M_ASN1_OCTET_STRING_new();
 571                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 572                                 PKCS7_add_signed_attribute(si,
 573                                         NID_pkcs9_messageDigest,
 574                                         V_ASN1_OCTET_STRING,digest);
 575
 576                                 /* Now sign the mess */
 577                                 EVP_SignInit(&ctx_tmp,md_tmp);
 578                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
 579                                            i2d_X509_ATTRIBUTE,
 580                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 581                                 pp=(unsigned char *)Malloc(x);
 582                                 p=pp;
 583                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
 584                                            i2d_X509_ATTRIBUTE,
 585                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 586                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 587                                 Free(pp);
 588                                 pp=NULL;
 589                                 }
 590
 591                         if (si->pkey->type == EVP_PKEY_DSA)
 592                                 ctx_tmp.digest=EVP_dss1();
 593
 594                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 595                                 (unsigned int *)&buf->length,si->pkey))
 596                                 {
 597                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 598                                 goto err;
 599                                 }
 600                         if (!ASN1_STRING_set(si->enc_digest,
 601                                 (unsigned char *)buf->data,buf->length))
 602                                 {
 603                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 604                                 goto err;
 605                                 }
 606                         }
 607                 }
 608
 609         if (!p7->detached)
 610                 {
 611                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 612                 if (btmp == NULL)
 613                         {
 614                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 615                         goto err;
 616                         }
 617                 BIO_get_mem_ptr(btmp,&buf_mem);
 618                 /* Mark the BIO read only then we can use its copy of the data
 619                  * instead of making an extra copy.
 620                  */
 621                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 622                 BIO_set_mem_eof_return(btmp, 0);
 623                 os->data = (unsigned char *)buf_mem->data;
 624                 os->length = buf_mem->length;
 625 #if 0
 626                 M_ASN1_OCTET_STRING_set(os,
 627                         (unsigned char *)buf_mem->data,buf_mem->length);
 628 #endif
 629                 }
 630         if (pp != NULL) Free(pp);
 631         pp=NULL;
 632
 633         ret=1;
 634 err:
 635         if (buf != NULL) BUF_MEM_free(buf);
 636         return(ret);
 637         }
 638
 639 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 640              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 641         {
 642         PKCS7_ISSUER_AND_SERIAL *ias;
 643         int ret=0,i;
 644         STACK_OF(X509) *cert;
 645         X509 *x509;
 646
 647         if (PKCS7_type_is_signed(p7))
 648                 {
 649                 cert=p7->d.sign->cert;
 650                 }
 651         else if (PKCS7_type_is_signedAndEnveloped(p7))
 652                 {
 653                 cert=p7->d.signed_and_enveloped->cert;
 654                 }
 655         else
 656                 {
 657                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 658                 goto err;
 659                 }
 660         /* XXXXXXXXXXXXXXXXXXXXXXX */
 661         ias=si->issuer_and_serial;
 662
 663         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 664
 665         /* were we able to find the cert in passed to us */
 666         if (x509 == NULL)
 667                 {
 668                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 669                 goto err;
 670                 }
 671
 672         /* Lets verify */
 673         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 674         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 675         i=X509_verify_cert(ctx);
 676         if (i <= 0)
 677                 {
 678                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 679                 X509_STORE_CTX_cleanup(ctx);
 680                 goto err;
 681                 }
 682         X509_STORE_CTX_cleanup(ctx);
 683
 684         return PKCS7_signatureVerify(bio, p7, si, x509);
 685         err:
 686         return ret;
 687         }
 688
 689 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 690                                                                 X509 *x509)
 691         {
 692         ASN1_OCTET_STRING *os;
 693         EVP_MD_CTX mdc_tmp,*mdc;
 694         unsigned char *pp,*p;
 695         int ret=0,i;
 696         int md_type;
 697         STACK_OF(X509_ATTRIBUTE) *sk;
 698         BIO *btmp;
 699         EVP_PKEY *pkey;
 700
 701         if (!PKCS7_type_is_signed(p7) &&
 702                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 703                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 704                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 705                 goto err;
 706         }
 707
 708         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 709
 710         btmp=bio;
 711         for (;;)
 712                 {
 713                 if ((btmp == NULL) ||
 714                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 715                         {
 716                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 717                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 718                         goto err;
 719                         }
 720                 BIO_get_md_ctx(btmp,&mdc);
 721                 if (mdc == NULL)
 722                         {
 723                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 724                                                         PKCS7_R_INTERNAL_ERROR);
 725                         goto err;
 726                         }
 727                 if (EVP_MD_CTX_type(mdc) == md_type)
 728                         break;
 729                 btmp=btmp->next_bio;
 730                 }
 731
 732         /* mdc is the digest ctx that we want, unless there are attributes,
 733          * in which case the digest is the signed attributes */
 734         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 735
 736         sk=si->auth_attr;
 737         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 738                 {
 739                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 740                 unsigned int md_len;
 741                 ASN1_OCTET_STRING *message_digest;
 742
 743                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 744                 message_digest=PKCS7_digest_from_attributes(sk);
 745                 if (!message_digest)
 746                         {
 747                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 748                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 749                         goto err;
 750                         }
 751                 if ((message_digest->length != (int)md_len) ||
 752                         (memcmp(message_digest->data,md_dat,md_len)))
 753                         {
 754 #if 0
 755 {
 756 int ii;
 757 for (ii=0; ii<message_digest->length; ii++)
 758         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 759 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 760 }
 761 #endif
 762                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 763                                                         PKCS7_R_DIGEST_FAILURE);
 764                         ret= -1;
 765                         goto err;
 766                         }
 767
 768                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 769                 /* Note: when forming the encoding of the attributes we
 770                  * shouldn't reorder them or this will break the signature.
 771                  * This is done by using the IS_SEQUENCE flag.
 772                  */
 773                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
 774                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 775                 pp=Malloc(i);
 776                 p=pp;
 777                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
 778                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 779                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 780
 781                 Free(pp);
 782                 }
 783
 784         os=si->enc_digest;
 785         pkey = X509_get_pubkey(x509);
 786         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 787
 788         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 789         EVP_PKEY_free(pkey);
 790         if (i <= 0)
 791                 {
 792                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 793                                                 PKCS7_R_SIGNATURE_FAILURE);
 794                 ret= -1;
 795                 goto err;
 796                 }
 797         else
 798                 ret=1;
 799 err:
 800         return(ret);
 801         }
 802
 803 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 804         {
 805         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 806         PKCS7_RECIP_INFO *ri;
 807         int i;
 808
 809         i=OBJ_obj2nid(p7->type);
 810         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 811         rsk=p7->d.signed_and_enveloped->recipientinfo;
 812         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 813         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 814         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 815         return(ri->issuer_and_serial);
 816         }
 817
 818 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 819         {
 820         return(get_attribute(si->auth_attr,nid));
 821         }
 822
 823 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 824         {
 825         return(get_attribute(si->unauth_attr,nid));
 826         }
 827
 828 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 829         {
 830         int i;
 831         X509_ATTRIBUTE *xa;
 832         ASN1_OBJECT *o;
 833
 834         o=OBJ_nid2obj(nid);
 835         if (!o || !sk) return(NULL);
 836         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 837                 {
 838                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 839                 if (OBJ_cmp(xa->object,o) == 0)
 840                         {
 841                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 842                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 843                         else
 844                                 return(NULL);
 845                         }
 846                 }
 847         return(NULL);
 848         }
 849
 850 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 851 {
 852         ASN1_TYPE *astype;
 853         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 854         return astype->value.octet_string;
 855 }
 856
 857 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 858                                 STACK_OF(X509_ATTRIBUTE) *sk)
 859         {
 860         int i;
 861
 862         if (p7si->auth_attr != NULL)
 863                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 864         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 865         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 866                 {
 867                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 868                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 869                     == NULL)
 870                         return(0);
 871                 }
 872         return(1);
 873         }
 874
 875 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 876         {
 877         int i;
 878
 879         if (p7si->unauth_attr != NULL)
 880                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 881                                            X509_ATTRIBUTE_free);
 882         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 883         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 884                 {
 885                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 886                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 887                     == NULL)
 888                         return(0);
 889                 }
 890         return(1);
 891         }
 892
 893 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 894              void *value)
 895         {
 896         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 897         }
 898
 899 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 900              void *value)
 901         {
 902         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 903         }
 904
 905 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 906                          void *value)
 907         {
 908         X509_ATTRIBUTE *attr=NULL;
 909
 910         if (*sk == NULL)
 911                 {
 912                 *sk = sk_X509_ATTRIBUTE_new(NULL);
 913 new_attrib:
 914                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 915                 sk_X509_ATTRIBUTE_push(*sk,attr);
 916                 }
 917         else
 918                 {
 919                 int i;
 920
 921                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 922                         {
 923                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 924                         if (OBJ_obj2nid(attr->object) == nid)
 925                                 {
 926                                 X509_ATTRIBUTE_free(attr);
 927                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 928                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 929                                 goto end;
 930                                 }
 931                         }
 932                 goto new_attrib;
 933                 }
 934 end:
 935         return(1);
 936         }
 937