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
  65 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
  66                          void *value);
  67 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
  68
  69 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
  70         {
  71         int i,j;
  72         BIO *out=NULL,*btmp=NULL;
  73         X509_ALGOR *xa;
  74         const EVP_MD *evp_md;
  75         const EVP_CIPHER *evp_cipher=NULL;
  76         STACK_OF(X509_ALGOR) *md_sk=NULL;
  77         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
  78         X509_ALGOR *xalg=NULL;
  79         PKCS7_RECIP_INFO *ri=NULL;
  80         EVP_PKEY *pkey;
  81
  82         i=OBJ_obj2nid(p7->type);
  83         p7->state=PKCS7_S_HEADER;
  84
  85         switch (i)
  86                 {
  87         case NID_pkcs7_signed:
  88                 md_sk=p7->d.sign->md_algs;
  89                 break;
  90         case NID_pkcs7_signedAndEnveloped:
  91                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  92                 md_sk=p7->d.signed_and_enveloped->md_algs;
  93                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  94                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
  95                 if (evp_cipher == NULL)
  96                         {
  97                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
  98                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
  99                         goto err;
 100                         }
 101                 break;
 102         case NID_pkcs7_enveloped:
 103                 rsk=p7->d.enveloped->recipientinfo;
 104                 xalg=p7->d.enveloped->enc_data->algorithm;
 105                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 106                 if (evp_cipher == NULL)
 107                         {
 108                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 109                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 110                         goto err;
 111                         }
 112                 break;
 113         default:
 114                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 115                 goto err;
 116                 }
 117
 118         if (md_sk != NULL)
 119                 {
 120                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 121                         {
 122                         xa=sk_X509_ALGOR_value(md_sk,i);
 123                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 124                                 {
 125                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 126                                 goto err;
 127                                 }
 128
 129                         j=OBJ_obj2nid(xa->algorithm);
 130                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 131                         if (evp_md == NULL)
 132                                 {
 133                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 134                                 goto err;
 135                                 }
 136
 137                         BIO_set_md(btmp,evp_md);
 138                         if (out == NULL)
 139                                 out=btmp;
 140                         else
 141                                 BIO_push(out,btmp);
 142                         btmp=NULL;
 143                         }
 144                 }
 145
 146         if (evp_cipher != NULL)
 147                 {
 148                 unsigned char key[EVP_MAX_KEY_LENGTH];
 149                 unsigned char iv[EVP_MAX_IV_LENGTH];
 150                 int keylen,ivlen;
 151                 int jj,max;
 152                 unsigned char *tmp;
 153                 EVP_CIPHER_CTX *ctx;
 154
 155                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 156                         {
 157                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 158                         goto err;
 159                         }
 160                 BIO_get_cipher_ctx(btmp, &ctx);
 161                 keylen=EVP_CIPHER_key_length(evp_cipher);
 162                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 163                 RAND_bytes(key,keylen);
 164                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 165                 if (ivlen > 0) RAND_bytes(iv,ivlen);
 166                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
 167
 168                 if (ivlen > 0) {
 169                         if (xalg->parameter == NULL)
 170                                                 xalg->parameter=ASN1_TYPE_new();
 171                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 172                                                                        goto err;
 173                 }
 174
 175                 /* Lets do the pub key stuff :-) */
 176                 max=0;
 177                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 178                         {
 179                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 180                         if (ri->cert == NULL)
 181                                 {
 182                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 183                                 goto err;
 184                                 }
 185                         pkey=X509_get_pubkey(ri->cert);
 186                         jj=EVP_PKEY_size(pkey);
 187                         EVP_PKEY_free(pkey);
 188                         if (max < jj) max=jj;
 189                         }
 190                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 191                         {
 192                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 193                         goto err;
 194                         }
 195                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 196                         {
 197                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 198                         pkey=X509_get_pubkey(ri->cert);
 199                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 200                         EVP_PKEY_free(pkey);
 201                         if (jj <= 0)
 202                                 {
 203                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 204                                 Free(tmp);
 205                                 goto err;
 206                                 }
 207                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 208                         }
 209                 Free(tmp);
 210                 memset(key, 0, keylen);
 211
 212                 if (out == NULL)
 213                         out=btmp;
 214                 else
 215                         BIO_push(out,btmp);
 216                 btmp=NULL;
 217                 }
 218
 219         if (bio == NULL) {
 220                 if (p7->detached)
 221                         bio=BIO_new(BIO_s_null());
 222                 else {
 223                         if (PKCS7_type_is_signed(p7) &&
 224                                 PKCS7_type_is_data(p7->d.sign->contents)) {
 225                                 ASN1_OCTET_STRING *os;
 226                                 os=p7->d.sign->contents->d.data;
 227                                 if (os->length > 0) bio =
 228                                         BIO_new_mem_buf(os->data, os->length);
 229                         }
 230                         if(bio == NULL) {
 231                                 bio=BIO_new(BIO_s_mem());
 232                                 BIO_set_mem_eof_return(bio,0);
 233                         }
 234                 }
 235         }
 236         BIO_push(out,bio);
 237         bio=NULL;
 238         if (0)
 239                 {
 240 err:
 241                 if (out != NULL)
 242                         BIO_free_all(out);
 243                 if (btmp != NULL)
 244                         BIO_free_all(btmp);
 245                 out=NULL;
 246                 }
 247         return(out);
 248         }
 249
 250 /* int */
 251 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 252         {
 253         int i,j;
 254         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 255         unsigned char *tmp=NULL;
 256         X509_ALGOR *xa;
 257         ASN1_OCTET_STRING *data_body=NULL;
 258         const EVP_MD *evp_md;
 259         const EVP_CIPHER *evp_cipher=NULL;
 260         EVP_CIPHER_CTX *evp_ctx=NULL;
 261         X509_ALGOR *enc_alg=NULL;
 262         STACK_OF(X509_ALGOR) *md_sk=NULL;
 263         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 264         X509_ALGOR *xalg=NULL;
 265         PKCS7_RECIP_INFO *ri=NULL;
 266         char is_rc2 = 0;
 267 /*      EVP_PKEY *pkey; */
 268 #if 0
 269         X509_STORE_CTX s_ctx;
 270 #endif
 271
 272         i=OBJ_obj2nid(p7->type);
 273         p7->state=PKCS7_S_HEADER;
 274
 275         switch (i)
 276                 {
 277         case NID_pkcs7_signed:
 278                 data_body=p7->d.sign->contents->d.data;
 279                 md_sk=p7->d.sign->md_algs;
 280                 break;
 281         case NID_pkcs7_signedAndEnveloped:
 282                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 283                 md_sk=p7->d.signed_and_enveloped->md_algs;
 284                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 285                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 286                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 287                 if (evp_cipher == NULL)
 288                         {
 289                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 290                         goto err;
 291                         }
 292                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 293                 break;
 294         case NID_pkcs7_enveloped:
 295                 rsk=p7->d.enveloped->recipientinfo;
 296                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 297                 data_body=p7->d.enveloped->enc_data->enc_data;
 298                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 299                 if (evp_cipher == NULL)
 300                         {
 301                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 302                         goto err;
 303                         }
 304                 xalg=p7->d.enveloped->enc_data->algorithm;
 305                 break;
 306         default:
 307                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 308                 goto err;
 309                 }
 310
 311         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc) is_rc2 = 1;
 312
 313         /* We will be checking the signature */
 314         if (md_sk != NULL)
 315                 {
 316                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 317                         {
 318                         xa=sk_X509_ALGOR_value(md_sk,i);
 319                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 320                                 {
 321                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 322                                 goto err;
 323                                 }
 324
 325                         j=OBJ_obj2nid(xa->algorithm);
 326                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 327                         if (evp_md == NULL)
 328                                 {
 329                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 330                                 goto err;
 331                                 }
 332
 333                         BIO_set_md(btmp,evp_md);
 334                         if (out == NULL)
 335                                 out=btmp;
 336                         else
 337                                 BIO_push(out,btmp);
 338                         btmp=NULL;
 339                         }
 340                 }
 341
 342         if (evp_cipher != NULL)
 343                 {
 344 #if 0
 345                 unsigned char key[EVP_MAX_KEY_LENGTH];
 346                 unsigned char iv[EVP_MAX_IV_LENGTH];
 347                 unsigned char *p;
 348                 int keylen,ivlen;
 349                 int max;
 350                 X509_OBJECT ret;
 351 #endif
 352                 int jj;
 353
 354                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 355                         {
 356                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 357                         goto err;
 358                         }
 359
 360                 /* It was encrypted, we need to decrypt the secret key
 361                  * with the private key */
 362
 363                 /* Find the recipientInfo which matches the passed certificate
 364                  * (if any)
 365                  */
 366
 367                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 368                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 369                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 370                                         pcert->cert_info->issuer) &&
 371                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 372                                         ri->issuer_and_serial->serial)) break;
 373                         ri=NULL;
 374                 }
 375                 if (ri == NULL) {
 376                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 377                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 378                         return(NULL);
 379                 }
 380
 381                 jj=EVP_PKEY_size(pkey);
 382                 tmp=(unsigned char *)Malloc(jj+10);
 383                 if (tmp == NULL)
 384                         {
 385                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 386                         goto err;
 387                         }
 388
 389                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 390                         M_ASN1_STRING_length(ri->enc_key), pkey);
 391                 if (jj <= 0)
 392                         {
 393                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 394                         goto err;
 395                         }
 396
 397                 evp_ctx=NULL;
 398                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 399                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 400                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 401                         return(NULL);
 402
 403                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 404                         /* HACK: some S/MIME clients don't use the same key
 405                          * and effective key length. The key length is
 406                          * determined by the size of the decrypted RSA key.
 407                          * So we hack things to manually set the RC2 key
 408                          * because we currently can't do this with the EVP
 409                          * interface.
 410                          */
 411                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
 412                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
 413                         else {
 414
 415                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 416                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 417                                 goto err;
 418                         }
 419                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
 420
 421                 memset(tmp,0,jj);
 422
 423                 if (out == NULL)
 424                         out=etmp;
 425                 else
 426                         BIO_push(out,etmp);
 427                 etmp=NULL;
 428                 }
 429
 430 #if 1
 431         if (p7->detached || (in_bio != NULL))
 432                 {
 433                 bio=in_bio;
 434                 }
 435         else
 436                 {
 437 #if 0
 438                 bio=BIO_new(BIO_s_mem());
 439                 /* We need to set this so that when we have read all
 440                  * the data, the encrypt BIO, if present, will read
 441                  * EOF and encode the last few bytes */
 442                 BIO_set_mem_eof_return(bio,0);
 443
 444                 if (data_body->length > 0)
 445                         BIO_write(bio,(char *)data_body->data,data_body->length);
 446 #else
 447                 if (data_body->length > 0)
 448                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 449                 else {
 450                         bio=BIO_new(BIO_s_mem());
 451                         BIO_set_mem_eof_return(bio,0);
 452                 }
 453 #endif
 454                 }
 455         BIO_push(out,bio);
 456         bio=NULL;
 457 #endif
 458         if (0)
 459                 {
 460 err:
 461                 if (out != NULL) BIO_free_all(out);
 462                 if (btmp != NULL) BIO_free_all(btmp);
 463                 if (etmp != NULL) BIO_free_all(etmp);
 464                 if (bio != NULL) BIO_free_all(bio);
 465                 out=NULL;
 466                 }
 467         if (tmp != NULL)
 468                 Free(tmp);
 469         return(out);
 470         }
 471
 472 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 473         {
 474         int ret=0;
 475         int i,j;
 476         BIO *btmp;
 477         BUF_MEM *buf_mem=NULL;
 478         BUF_MEM *buf=NULL;
 479         PKCS7_SIGNER_INFO *si;
 480         EVP_MD_CTX *mdc,ctx_tmp;
 481         STACK_OF(X509_ATTRIBUTE) *sk;
 482         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 483         unsigned char *p,*pp=NULL;
 484         int x;
 485         ASN1_OCTET_STRING *os=NULL;
 486
 487         i=OBJ_obj2nid(p7->type);
 488         p7->state=PKCS7_S_HEADER;
 489
 490         switch (i)
 491                 {
 492         case NID_pkcs7_signedAndEnveloped:
 493                 /* XXXXXXXXXXXXXXXX */
 494                 si_sk=p7->d.signed_and_enveloped->signer_info;
 495                 os=M_ASN1_OCTET_STRING_new();
 496                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 497                 break;
 498         case NID_pkcs7_enveloped:
 499                 /* XXXXXXXXXXXXXXXX */
 500                 os=M_ASN1_OCTET_STRING_new();
 501                 p7->d.enveloped->enc_data->enc_data=os;
 502                 break;
 503         case NID_pkcs7_signed:
 504                 si_sk=p7->d.sign->signer_info;
 505                 os=p7->d.sign->contents->d.data;
 506                 /* If detached data then the content is excluded */
 507                 if(p7->detached) {
 508                         M_ASN1_OCTET_STRING_free(os);
 509                         p7->d.sign->contents->d.data = NULL;
 510                 }
 511                 break;
 512                 }
 513
 514         if (si_sk != NULL)
 515                 {
 516                 if ((buf=BUF_MEM_new()) == NULL)
 517                         {
 518                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 519                         goto err;
 520                         }
 521                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 522                         {
 523                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 524                         if (si->pkey == NULL) continue;
 525
 526                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 527
 528                         btmp=bio;
 529                         for (;;)
 530                                 {
 531                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 532                                         == NULL)
 533                                         {
 534                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 535                                         goto err;
 536                                         }
 537                                 BIO_get_md_ctx(btmp,&mdc);
 538                                 if (mdc == NULL)
 539                                         {
 540                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 541                                         goto err;
 542                                         }
 543                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 544                                         break;
 545                                 else
 546                                         btmp=btmp->next_bio;
 547                                 }
 548
 549                         /* We now have the EVP_MD_CTX, lets do the
 550                          * signing. */
 551                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 552                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 553                                 {
 554                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 555                                 goto err;
 556                                 }
 557
 558                         sk=si->auth_attr;
 559
 560                         /* If there are attributes, we add the digest
 561                          * attribute and only sign the attributes */
 562                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 563                                 {
 564                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 565                                 unsigned int md_len;
 566                                 ASN1_OCTET_STRING *digest;
 567                                 ASN1_UTCTIME *sign_time;
 568                                 const EVP_MD *md_tmp;
 569
 570                                 /* Add signing time */
 571                                 sign_time=X509_gmtime_adj(NULL,0);
 572                                 PKCS7_add_signed_attribute(si,
 573                                         NID_pkcs9_signingTime,
 574                                         V_ASN1_UTCTIME,sign_time);
 575
 576                                 /* Add digest */
 577                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 578                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 579                                 digest=M_ASN1_OCTET_STRING_new();
 580                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 581                                 PKCS7_add_signed_attribute(si,
 582                                         NID_pkcs9_messageDigest,
 583                                         V_ASN1_OCTET_STRING,digest);
 584
 585                                 /* Now sign the mess */
 586                                 EVP_SignInit(&ctx_tmp,md_tmp);
 587                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
 588                                            i2d_X509_ATTRIBUTE,
 589                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 590                                 pp=(unsigned char *)Malloc(x);
 591                                 p=pp;
 592                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
 593                                            i2d_X509_ATTRIBUTE,
 594                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 595                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 596                                 Free(pp);
 597                                 pp=NULL;
 598                                 }
 599
 600                         if (si->pkey->type == EVP_PKEY_DSA)
 601                                 ctx_tmp.digest=EVP_dss1();
 602
 603                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 604                                 (unsigned int *)&buf->length,si->pkey))
 605                                 {
 606                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 607                                 goto err;
 608                                 }
 609                         if (!ASN1_STRING_set(si->enc_digest,
 610                                 (unsigned char *)buf->data,buf->length))
 611                                 {
 612                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 613                                 goto err;
 614                                 }
 615                         }
 616                 }
 617
 618         if (!p7->detached)
 619                 {
 620                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 621                 if (btmp == NULL)
 622                         {
 623                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 624                         goto err;
 625                         }
 626                 BIO_get_mem_ptr(btmp,&buf_mem);
 627                 /* Mark the BIO read only then we can use its copy of the data
 628                  * instead of making an extra copy.
 629                  */
 630                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 631                 BIO_set_mem_eof_return(btmp, 0);
 632                 os->data = (unsigned char *)buf_mem->data;
 633                 os->length = buf_mem->length;
 634 #if 0
 635                 M_ASN1_OCTET_STRING_set(os,
 636                         (unsigned char *)buf_mem->data,buf_mem->length);
 637 #endif
 638                 }
 639         if (pp != NULL) Free(pp);
 640         pp=NULL;
 641
 642         ret=1;
 643 err:
 644         if (buf != NULL) BUF_MEM_free(buf);
 645         return(ret);
 646         }
 647
 648 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 649              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 650         {
 651         PKCS7_ISSUER_AND_SERIAL *ias;
 652         int ret=0,i;
 653         STACK_OF(X509) *cert;
 654         X509 *x509;
 655
 656         if (PKCS7_type_is_signed(p7))
 657                 {
 658                 cert=p7->d.sign->cert;
 659                 }
 660         else if (PKCS7_type_is_signedAndEnveloped(p7))
 661                 {
 662                 cert=p7->d.signed_and_enveloped->cert;
 663                 }
 664         else
 665                 {
 666                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 667                 goto err;
 668                 }
 669         /* XXXXXXXXXXXXXXXXXXXXXXX */
 670         ias=si->issuer_and_serial;
 671
 672         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 673
 674         /* were we able to find the cert in passed to us */
 675         if (x509 == NULL)
 676                 {
 677                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 678                 goto err;
 679                 }
 680
 681         /* Lets verify */
 682         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 683         i=X509_verify_cert(ctx);
 684         if (i <= 0)
 685                 {
 686                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 687                 goto err;
 688                 }
 689         X509_STORE_CTX_cleanup(ctx);
 690
 691         return PKCS7_signatureVerify(bio, p7, si, x509);
 692         err:
 693         return ret;
 694         }
 695
 696 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 697                                                                 X509 *x509)
 698         {
 699         ASN1_OCTET_STRING *os;
 700         EVP_MD_CTX mdc_tmp,*mdc;
 701         unsigned char *pp,*p;
 702         int ret=0,i;
 703         int md_type;
 704         STACK_OF(X509_ATTRIBUTE) *sk;
 705         BIO *btmp;
 706         EVP_PKEY *pkey;
 707
 708         if (!PKCS7_type_is_signed(p7) &&
 709                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 710                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 711                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 712                 goto err;
 713         }
 714
 715         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 716
 717         btmp=bio;
 718         for (;;)
 719                 {
 720                 if ((btmp == NULL) ||
 721                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 722                         {
 723                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 724                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 725                         goto err;
 726                         }
 727                 BIO_get_md_ctx(btmp,&mdc);
 728                 if (mdc == NULL)
 729                         {
 730                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 731                                                         PKCS7_R_INTERNAL_ERROR);
 732                         goto err;
 733                         }
 734                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 735                         break;
 736                 btmp=btmp->next_bio;
 737                 }
 738
 739         /* mdc is the digest ctx that we want, unless there are attributes,
 740          * in which case the digest is the signed attributes */
 741         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 742
 743         sk=si->auth_attr;
 744         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 745                 {
 746                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 747                 unsigned int md_len;
 748                 ASN1_OCTET_STRING *message_digest;
 749
 750                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 751                 message_digest=PKCS7_digest_from_attributes(sk);
 752                 if (!message_digest)
 753                         {
 754                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 755                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 756                         goto err;
 757                         }
 758                 if ((message_digest->length != (int)md_len) ||
 759                         (memcmp(message_digest->data,md_dat,md_len)))
 760                         {
 761 #if 0
 762 {
 763 int ii;
 764 for (ii=0; ii<message_digest->length; ii++)
 765         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 766 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 767 }
 768 #endif
 769                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 770                                                         PKCS7_R_DIGEST_FAILURE);
 771                         ret= -1;
 772                         goto err;
 773                         }
 774
 775                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 776                 /* Note: when forming the encoding of the attributes we
 777                  * shouldn't reorder them or this will break the signature.
 778                  * This is done by using the IS_SEQUENCE flag.
 779                  */
 780                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
 781                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 782                 pp=Malloc(i);
 783                 p=pp;
 784                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
 785                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 786                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 787
 788                 Free(pp);
 789                 }
 790
 791         os=si->enc_digest;
 792         pkey = X509_get_pubkey(x509);
 793         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 794
 795         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 796         EVP_PKEY_free(pkey);
 797         if (i <= 0)
 798                 {
 799                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 800                                                 PKCS7_R_SIGNATURE_FAILURE);
 801                 ret= -1;
 802                 goto err;
 803                 }
 804         else
 805                 ret=1;
 806 err:
 807         return(ret);
 808         }
 809
 810 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 811         {
 812         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 813         PKCS7_RECIP_INFO *ri;
 814         int i;
 815
 816         i=OBJ_obj2nid(p7->type);
 817         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 818         rsk=p7->d.signed_and_enveloped->recipientinfo;
 819         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 820         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 821         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 822         return(ri->issuer_and_serial);
 823         }
 824
 825 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 826         {
 827         return(get_attribute(si->auth_attr,nid));
 828         }
 829
 830 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 831         {
 832         return(get_attribute(si->unauth_attr,nid));
 833         }
 834
 835 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 836         {
 837         int i;
 838         X509_ATTRIBUTE *xa;
 839         ASN1_OBJECT *o;
 840
 841         o=OBJ_nid2obj(nid);
 842         if (!o || !sk) return(NULL);
 843         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 844                 {
 845                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 846                 if (OBJ_cmp(xa->object,o) == 0)
 847                         {
 848                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 849                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 850                         else
 851                                 return(NULL);
 852                         }
 853                 }
 854         return(NULL);
 855         }
 856
 857 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 858 {
 859         ASN1_TYPE *astype;
 860         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 861         return astype->value.octet_string;
 862 }
 863
 864 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 865                                 STACK_OF(X509_ATTRIBUTE) *sk)
 866         {
 867         int i;
 868
 869         if (p7si->auth_attr != NULL)
 870                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 871         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 872         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 873                 {
 874                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 875                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 876                     == NULL)
 877                         return(0);
 878                 }
 879         return(1);
 880         }
 881
 882 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 883         {
 884         int i;
 885
 886         if (p7si->unauth_attr != NULL)
 887                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 888                                            X509_ATTRIBUTE_free);
 889         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 890         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 891                 {
 892                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 893                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 894                     == NULL)
 895                         return(0);
 896                 }
 897         return(1);
 898         }
 899
 900 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 901              void *value)
 902         {
 903         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 904         }
 905
 906 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 907              void *value)
 908         {
 909         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 910         }
 911
 912 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 913                          void *value)
 914         {
 915         X509_ATTRIBUTE *attr=NULL;
 916
 917         if (*sk == NULL)
 918                 {
 919                 *sk = sk_X509_ATTRIBUTE_new(NULL);
 920 new_attrib:
 921                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 922                 sk_X509_ATTRIBUTE_push(*sk,attr);
 923                 }
 924         else
 925                 {
 926                 int i;
 927
 928                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 929                         {
 930                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 931                         if (OBJ_obj2nid(attr->object) == nid)
 932                                 {
 933                                 X509_ATTRIBUTE_free(attr);
 934                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 935                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 936                                 goto end;
 937                                 }
 938                         }
 939                 goto new_attrib;
 940                 }
 941 end:
 942         return(1);
 943         }
 944