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 #ifndef NO_RC2
 269         char is_rc2 = 0;
 270 #endif
 271 /*      EVP_PKEY *pkey; */
 272 #if 0
 273         X509_STORE_CTX s_ctx;
 274 #endif
 275
 276         i=OBJ_obj2nid(p7->type);
 277         p7->state=PKCS7_S_HEADER;
 278
 279         switch (i)
 280                 {
 281         case NID_pkcs7_signed:
 282                 data_body=p7->d.sign->contents->d.data;
 283                 md_sk=p7->d.sign->md_algs;
 284                 break;
 285         case NID_pkcs7_signedAndEnveloped:
 286                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 287                 md_sk=p7->d.signed_and_enveloped->md_algs;
 288                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 289                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 290                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 291                 if (evp_cipher == NULL)
 292                         {
 293                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 294                         goto err;
 295                         }
 296                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 297                 break;
 298         case NID_pkcs7_enveloped:
 299                 rsk=p7->d.enveloped->recipientinfo;
 300                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 301                 data_body=p7->d.enveloped->enc_data->enc_data;
 302                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 303                 if (evp_cipher == NULL)
 304                         {
 305                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 306                         goto err;
 307                         }
 308                 xalg=p7->d.enveloped->enc_data->algorithm;
 309                 break;
 310         default:
 311                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 312                 goto err;
 313                 }
 314
 315         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc)
 316                 {
 317 #ifndef NO_RC2
 318                 is_rc2 = 1;
 319 #else
 320                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 321                 goto err;
 322 #endif
 323                 }
 324
 325         /* We will be checking the signature */
 326         if (md_sk != NULL)
 327                 {
 328                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 329                         {
 330                         xa=sk_X509_ALGOR_value(md_sk,i);
 331                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 332                                 {
 333                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 334                                 goto err;
 335                                 }
 336
 337                         j=OBJ_obj2nid(xa->algorithm);
 338                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 339                         if (evp_md == NULL)
 340                                 {
 341                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 342                                 goto err;
 343                                 }
 344
 345                         BIO_set_md(btmp,evp_md);
 346                         if (out == NULL)
 347                                 out=btmp;
 348                         else
 349                                 BIO_push(out,btmp);
 350                         btmp=NULL;
 351                         }
 352                 }
 353
 354         if (evp_cipher != NULL)
 355                 {
 356 #if 0
 357                 unsigned char key[EVP_MAX_KEY_LENGTH];
 358                 unsigned char iv[EVP_MAX_IV_LENGTH];
 359                 unsigned char *p;
 360                 int keylen,ivlen;
 361                 int max;
 362                 X509_OBJECT ret;
 363 #endif
 364                 int jj;
 365
 366                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 367                         {
 368                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 369                         goto err;
 370                         }
 371
 372                 /* It was encrypted, we need to decrypt the secret key
 373                  * with the private key */
 374
 375                 /* Find the recipientInfo which matches the passed certificate
 376                  * (if any)
 377                  */
 378
 379                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 380                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 381                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 382                                         pcert->cert_info->issuer) &&
 383                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 384                                         ri->issuer_and_serial->serial)) break;
 385                         ri=NULL;
 386                 }
 387                 if (ri == NULL) {
 388                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 389                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 390                         return(NULL);
 391                 }
 392
 393                 jj=EVP_PKEY_size(pkey);
 394                 tmp=(unsigned char *)Malloc(jj+10);
 395                 if (tmp == NULL)
 396                         {
 397                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 398                         goto err;
 399                         }
 400
 401                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 402                         M_ASN1_STRING_length(ri->enc_key), pkey);
 403                 if (jj <= 0)
 404                         {
 405                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 406                         goto err;
 407                         }
 408
 409                 evp_ctx=NULL;
 410                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 411                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 412                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 413                         return(NULL);
 414
 415                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 416                         /* HACK: some S/MIME clients don't use the same key
 417                          * and effective key length. The key length is
 418                          * determined by the size of the decrypted RSA key.
 419                          * So we hack things to manually set the RC2 key
 420                          * because we currently can't do this with the EVP
 421                          * interface.
 422                          */
 423 #ifndef NO_RC2
 424                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
 425                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
 426                         else
 427 #endif
 428                                 {
 429                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 430                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 431                                 goto err;
 432                                 }
 433                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
 434
 435                 memset(tmp,0,jj);
 436
 437                 if (out == NULL)
 438                         out=etmp;
 439                 else
 440                         BIO_push(out,etmp);
 441                 etmp=NULL;
 442                 }
 443
 444 #if 1
 445         if (p7->detached || (in_bio != NULL))
 446                 {
 447                 bio=in_bio;
 448                 }
 449         else
 450                 {
 451 #if 0
 452                 bio=BIO_new(BIO_s_mem());
 453                 /* We need to set this so that when we have read all
 454                  * the data, the encrypt BIO, if present, will read
 455                  * EOF and encode the last few bytes */
 456                 BIO_set_mem_eof_return(bio,0);
 457
 458                 if (data_body->length > 0)
 459                         BIO_write(bio,(char *)data_body->data,data_body->length);
 460 #else
 461                 if (data_body->length > 0)
 462                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 463                 else {
 464                         bio=BIO_new(BIO_s_mem());
 465                         BIO_set_mem_eof_return(bio,0);
 466                 }
 467 #endif
 468                 }
 469         BIO_push(out,bio);
 470         bio=NULL;
 471 #endif
 472         if (0)
 473                 {
 474 err:
 475                 if (out != NULL) BIO_free_all(out);
 476                 if (btmp != NULL) BIO_free_all(btmp);
 477                 if (etmp != NULL) BIO_free_all(etmp);
 478                 if (bio != NULL) BIO_free_all(bio);
 479                 out=NULL;
 480                 }
 481         if (tmp != NULL)
 482                 Free(tmp);
 483         return(out);
 484         }
 485
 486 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 487         {
 488         int ret=0;
 489         int i,j;
 490         BIO *btmp;
 491         BUF_MEM *buf_mem=NULL;
 492         BUF_MEM *buf=NULL;
 493         PKCS7_SIGNER_INFO *si;
 494         EVP_MD_CTX *mdc,ctx_tmp;
 495         STACK_OF(X509_ATTRIBUTE) *sk;
 496         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 497         unsigned char *p,*pp=NULL;
 498         int x;
 499         ASN1_OCTET_STRING *os=NULL;
 500
 501         i=OBJ_obj2nid(p7->type);
 502         p7->state=PKCS7_S_HEADER;
 503
 504         switch (i)
 505                 {
 506         case NID_pkcs7_signedAndEnveloped:
 507                 /* XXXXXXXXXXXXXXXX */
 508                 si_sk=p7->d.signed_and_enveloped->signer_info;
 509                 os=M_ASN1_OCTET_STRING_new();
 510                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 511                 break;
 512         case NID_pkcs7_enveloped:
 513                 /* XXXXXXXXXXXXXXXX */
 514                 os=M_ASN1_OCTET_STRING_new();
 515                 p7->d.enveloped->enc_data->enc_data=os;
 516                 break;
 517         case NID_pkcs7_signed:
 518                 si_sk=p7->d.sign->signer_info;
 519                 os=p7->d.sign->contents->d.data;
 520                 /* If detached data then the content is excluded */
 521                 if(p7->detached) {
 522                         M_ASN1_OCTET_STRING_free(os);
 523                         p7->d.sign->contents->d.data = NULL;
 524                 }
 525                 break;
 526                 }
 527
 528         if (si_sk != NULL)
 529                 {
 530                 if ((buf=BUF_MEM_new()) == NULL)
 531                         {
 532                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 533                         goto err;
 534                         }
 535                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 536                         {
 537                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 538                         if (si->pkey == NULL) continue;
 539
 540                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 541
 542                         btmp=bio;
 543                         for (;;)
 544                                 {
 545                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 546                                         == NULL)
 547                                         {
 548                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 549                                         goto err;
 550                                         }
 551                                 BIO_get_md_ctx(btmp,&mdc);
 552                                 if (mdc == NULL)
 553                                         {
 554                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 555                                         goto err;
 556                                         }
 557                                 if (EVP_MD_CTX_type(mdc) == j)
 558                                         break;
 559                                 else
 560                                         btmp=btmp->next_bio;
 561                                 }
 562
 563                         /* We now have the EVP_MD_CTX, lets do the
 564                          * signing. */
 565                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 566                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 567                                 {
 568                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 569                                 goto err;
 570                                 }
 571
 572                         sk=si->auth_attr;
 573
 574                         /* If there are attributes, we add the digest
 575                          * attribute and only sign the attributes */
 576                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 577                                 {
 578                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 579                                 unsigned int md_len;
 580                                 ASN1_OCTET_STRING *digest;
 581                                 ASN1_UTCTIME *sign_time;
 582                                 const EVP_MD *md_tmp;
 583
 584                                 /* Add signing time */
 585                                 sign_time=X509_gmtime_adj(NULL,0);
 586                                 PKCS7_add_signed_attribute(si,
 587                                         NID_pkcs9_signingTime,
 588                                         V_ASN1_UTCTIME,sign_time);
 589
 590                                 /* Add digest */
 591                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 592                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 593                                 digest=M_ASN1_OCTET_STRING_new();
 594                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 595                                 PKCS7_add_signed_attribute(si,
 596                                         NID_pkcs9_messageDigest,
 597                                         V_ASN1_OCTET_STRING,digest);
 598
 599                                 /* Now sign the mess */
 600                                 EVP_SignInit(&ctx_tmp,md_tmp);
 601                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
 602                                            i2d_X509_ATTRIBUTE,
 603                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 604                                 pp=(unsigned char *)Malloc(x);
 605                                 p=pp;
 606                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
 607                                            i2d_X509_ATTRIBUTE,
 608                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 609                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 610                                 Free(pp);
 611                                 pp=NULL;
 612                                 }
 613
 614                         if (si->pkey->type == EVP_PKEY_DSA)
 615                                 ctx_tmp.digest=EVP_dss1();
 616
 617                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 618                                 (unsigned int *)&buf->length,si->pkey))
 619                                 {
 620                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 621                                 goto err;
 622                                 }
 623                         if (!ASN1_STRING_set(si->enc_digest,
 624                                 (unsigned char *)buf->data,buf->length))
 625                                 {
 626                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 627                                 goto err;
 628                                 }
 629                         }
 630                 }
 631
 632         if (!p7->detached)
 633                 {
 634                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 635                 if (btmp == NULL)
 636                         {
 637                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 638                         goto err;
 639                         }
 640                 BIO_get_mem_ptr(btmp,&buf_mem);
 641                 /* Mark the BIO read only then we can use its copy of the data
 642                  * instead of making an extra copy.
 643                  */
 644                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 645                 BIO_set_mem_eof_return(btmp, 0);
 646                 os->data = (unsigned char *)buf_mem->data;
 647                 os->length = buf_mem->length;
 648 #if 0
 649                 M_ASN1_OCTET_STRING_set(os,
 650                         (unsigned char *)buf_mem->data,buf_mem->length);
 651 #endif
 652                 }
 653         if (pp != NULL) Free(pp);
 654         pp=NULL;
 655
 656         ret=1;
 657 err:
 658         if (buf != NULL) BUF_MEM_free(buf);
 659         return(ret);
 660         }
 661
 662 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 663              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 664         {
 665         PKCS7_ISSUER_AND_SERIAL *ias;
 666         int ret=0,i;
 667         STACK_OF(X509) *cert;
 668         X509 *x509;
 669
 670         if (PKCS7_type_is_signed(p7))
 671                 {
 672                 cert=p7->d.sign->cert;
 673                 }
 674         else if (PKCS7_type_is_signedAndEnveloped(p7))
 675                 {
 676                 cert=p7->d.signed_and_enveloped->cert;
 677                 }
 678         else
 679                 {
 680                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 681                 goto err;
 682                 }
 683         /* XXXXXXXXXXXXXXXXXXXXXXX */
 684         ias=si->issuer_and_serial;
 685
 686         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 687
 688         /* were we able to find the cert in passed to us */
 689         if (x509 == NULL)
 690                 {
 691                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 692                 goto err;
 693                 }
 694
 695         /* Lets verify */
 696         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 697         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 698         i=X509_verify_cert(ctx);
 699         if (i <= 0)
 700                 {
 701                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 702                 goto err;
 703                 }
 704         X509_STORE_CTX_cleanup(ctx);
 705
 706         return PKCS7_signatureVerify(bio, p7, si, x509);
 707         err:
 708         return ret;
 709         }
 710
 711 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 712                                                                 X509 *x509)
 713         {
 714         ASN1_OCTET_STRING *os;
 715         EVP_MD_CTX mdc_tmp,*mdc;
 716         unsigned char *pp,*p;
 717         int ret=0,i;
 718         int md_type;
 719         STACK_OF(X509_ATTRIBUTE) *sk;
 720         BIO *btmp;
 721         EVP_PKEY *pkey;
 722
 723         if (!PKCS7_type_is_signed(p7) &&
 724                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 725                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 726                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 727                 goto err;
 728         }
 729
 730         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 731
 732         btmp=bio;
 733         for (;;)
 734                 {
 735                 if ((btmp == NULL) ||
 736                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 737                         {
 738                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 739                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 740                         goto err;
 741                         }
 742                 BIO_get_md_ctx(btmp,&mdc);
 743                 if (mdc == NULL)
 744                         {
 745                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 746                                                         PKCS7_R_INTERNAL_ERROR);
 747                         goto err;
 748                         }
 749                 if (EVP_MD_CTX_type(mdc) == md_type)
 750                         break;
 751                 btmp=btmp->next_bio;
 752                 }
 753
 754         /* mdc is the digest ctx that we want, unless there are attributes,
 755          * in which case the digest is the signed attributes */
 756         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 757
 758         sk=si->auth_attr;
 759         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 760                 {
 761                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 762                 unsigned int md_len;
 763                 ASN1_OCTET_STRING *message_digest;
 764
 765                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 766                 message_digest=PKCS7_digest_from_attributes(sk);
 767                 if (!message_digest)
 768                         {
 769                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 770                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 771                         goto err;
 772                         }
 773                 if ((message_digest->length != (int)md_len) ||
 774                         (memcmp(message_digest->data,md_dat,md_len)))
 775                         {
 776 #if 0
 777 {
 778 int ii;
 779 for (ii=0; ii<message_digest->length; ii++)
 780         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 781 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 782 }
 783 #endif
 784                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 785                                                         PKCS7_R_DIGEST_FAILURE);
 786                         ret= -1;
 787                         goto err;
 788                         }
 789
 790                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 791                 /* Note: when forming the encoding of the attributes we
 792                  * shouldn't reorder them or this will break the signature.
 793                  * This is done by using the IS_SEQUENCE flag.
 794                  */
 795                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
 796                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 797                 pp=Malloc(i);
 798                 p=pp;
 799                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
 800                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 801                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 802
 803                 Free(pp);
 804                 }
 805
 806         os=si->enc_digest;
 807         pkey = X509_get_pubkey(x509);
 808         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 809
 810         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 811         EVP_PKEY_free(pkey);
 812         if (i <= 0)
 813                 {
 814                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 815                                                 PKCS7_R_SIGNATURE_FAILURE);
 816                 ret= -1;
 817                 goto err;
 818                 }
 819         else
 820                 ret=1;
 821 err:
 822         return(ret);
 823         }
 824
 825 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 826         {
 827         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 828         PKCS7_RECIP_INFO *ri;
 829         int i;
 830
 831         i=OBJ_obj2nid(p7->type);
 832         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 833         rsk=p7->d.signed_and_enveloped->recipientinfo;
 834         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 835         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 836         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 837         return(ri->issuer_and_serial);
 838         }
 839
 840 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 841         {
 842         return(get_attribute(si->auth_attr,nid));
 843         }
 844
 845 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 846         {
 847         return(get_attribute(si->unauth_attr,nid));
 848         }
 849
 850 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 851         {
 852         int i;
 853         X509_ATTRIBUTE *xa;
 854         ASN1_OBJECT *o;
 855
 856         o=OBJ_nid2obj(nid);
 857         if (!o || !sk) return(NULL);
 858         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 859                 {
 860                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 861                 if (OBJ_cmp(xa->object,o) == 0)
 862                         {
 863                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 864                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 865                         else
 866                                 return(NULL);
 867                         }
 868                 }
 869         return(NULL);
 870         }
 871
 872 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 873 {
 874         ASN1_TYPE *astype;
 875         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 876         return astype->value.octet_string;
 877 }
 878
 879 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 880                                 STACK_OF(X509_ATTRIBUTE) *sk)
 881         {
 882         int i;
 883
 884         if (p7si->auth_attr != NULL)
 885                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 886         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 887         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 888                 {
 889                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 890                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 891                     == NULL)
 892                         return(0);
 893                 }
 894         return(1);
 895         }
 896
 897 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 898         {
 899         int i;
 900
 901         if (p7si->unauth_attr != NULL)
 902                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 903                                            X509_ATTRIBUTE_free);
 904         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 905         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 906                 {
 907                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 908                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 909                     == NULL)
 910                         return(0);
 911                 }
 912         return(1);
 913         }
 914
 915 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 916              void *value)
 917         {
 918         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 919         }
 920
 921 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 922              void *value)
 923         {
 924         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 925         }
 926
 927 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 928                          void *value)
 929         {
 930         X509_ATTRIBUTE *attr=NULL;
 931
 932         if (*sk == NULL)
 933                 {
 934                 *sk = sk_X509_ATTRIBUTE_new(NULL);
 935 new_attrib:
 936                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 937                 sk_X509_ATTRIBUTE_push(*sk,attr);
 938                 }
 939         else
 940                 {
 941                 int i;
 942
 943                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 944                         {
 945                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 946                         if (OBJ_obj2nid(attr->object) == nid)
 947                                 {
 948                                 X509_ATTRIBUTE_free(attr);
 949                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 950                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 951                                 goto end;
 952                                 }
 953                         }
 954                 goto new_attrib;
 955                 }
 956 end:
 957         return(1);
 958         }
 959