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                 RAND_bytes(key,keylen);
 165                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 166                 if (ivlen > 0) RAND_bytes(iv,ivlen);
 167                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
 168
 169                 if (ivlen > 0) {
 170                         if (xalg->parameter == NULL)
 171                                                 xalg->parameter=ASN1_TYPE_new();
 172                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 173                                                                        goto err;
 174                 }
 175
 176                 /* Lets do the pub key stuff :-) */
 177                 max=0;
 178                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 179                         {
 180                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 181                         if (ri->cert == NULL)
 182                                 {
 183                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 184                                 goto err;
 185                                 }
 186                         pkey=X509_get_pubkey(ri->cert);
 187                         jj=EVP_PKEY_size(pkey);
 188                         EVP_PKEY_free(pkey);
 189                         if (max < jj) max=jj;
 190                         }
 191                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 192                         {
 193                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 194                         goto err;
 195                         }
 196                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 197                         {
 198                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 199                         pkey=X509_get_pubkey(ri->cert);
 200                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 201                         EVP_PKEY_free(pkey);
 202                         if (jj <= 0)
 203                                 {
 204                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 205                                 Free(tmp);
 206                                 goto err;
 207                                 }
 208                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 209                         }
 210                 Free(tmp);
 211                 memset(key, 0, keylen);
 212
 213                 if (out == NULL)
 214                         out=btmp;
 215                 else
 216                         BIO_push(out,btmp);
 217                 btmp=NULL;
 218                 }
 219
 220         if (bio == NULL) {
 221                 if (p7->detached)
 222                         bio=BIO_new(BIO_s_null());
 223                 else {
 224                         if (PKCS7_type_is_signed(p7) &&
 225                                 PKCS7_type_is_data(p7->d.sign->contents)) {
 226                                 ASN1_OCTET_STRING *os;
 227                                 os=p7->d.sign->contents->d.data;
 228                                 if (os->length > 0) bio =
 229                                         BIO_new_mem_buf(os->data, os->length);
 230                         }
 231                         if(bio == NULL) {
 232                                 bio=BIO_new(BIO_s_mem());
 233                                 BIO_set_mem_eof_return(bio,0);
 234                         }
 235                 }
 236         }
 237         BIO_push(out,bio);
 238         bio=NULL;
 239         if (0)
 240                 {
 241 err:
 242                 if (out != NULL)
 243                         BIO_free_all(out);
 244                 if (btmp != NULL)
 245                         BIO_free_all(btmp);
 246                 out=NULL;
 247                 }
 248         return(out);
 249         }
 250
 251 /* int */
 252 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 253         {
 254         int i,j;
 255         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 256         unsigned char *tmp=NULL;
 257         X509_ALGOR *xa;
 258         ASN1_OCTET_STRING *data_body=NULL;
 259         const EVP_MD *evp_md;
 260         const EVP_CIPHER *evp_cipher=NULL;
 261         EVP_CIPHER_CTX *evp_ctx=NULL;
 262         X509_ALGOR *enc_alg=NULL;
 263         STACK_OF(X509_ALGOR) *md_sk=NULL;
 264         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 265         X509_ALGOR *xalg=NULL;
 266         PKCS7_RECIP_INFO *ri=NULL;
 267         char is_rc2 = 0;
 268 /*      EVP_PKEY *pkey; */
 269 #if 0
 270         X509_STORE_CTX s_ctx;
 271 #endif
 272
 273         i=OBJ_obj2nid(p7->type);
 274         p7->state=PKCS7_S_HEADER;
 275
 276         switch (i)
 277                 {
 278         case NID_pkcs7_signed:
 279                 data_body=p7->d.sign->contents->d.data;
 280                 md_sk=p7->d.sign->md_algs;
 281                 break;
 282         case NID_pkcs7_signedAndEnveloped:
 283                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 284                 md_sk=p7->d.signed_and_enveloped->md_algs;
 285                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 286                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 287                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 288                 if (evp_cipher == NULL)
 289                         {
 290                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 291                         goto err;
 292                         }
 293                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 294                 break;
 295         case NID_pkcs7_enveloped:
 296                 rsk=p7->d.enveloped->recipientinfo;
 297                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 298                 data_body=p7->d.enveloped->enc_data->enc_data;
 299                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 300                 if (evp_cipher == NULL)
 301                         {
 302                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 303                         goto err;
 304                         }
 305                 xalg=p7->d.enveloped->enc_data->algorithm;
 306                 break;
 307         default:
 308                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 309                 goto err;
 310                 }
 311
 312         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc) is_rc2 = 1;
 313
 314         /* We will be checking the signature */
 315         if (md_sk != NULL)
 316                 {
 317                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 318                         {
 319                         xa=sk_X509_ALGOR_value(md_sk,i);
 320                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 321                                 {
 322                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 323                                 goto err;
 324                                 }
 325
 326                         j=OBJ_obj2nid(xa->algorithm);
 327                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 328                         if (evp_md == NULL)
 329                                 {
 330                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 331                                 goto err;
 332                                 }
 333
 334                         BIO_set_md(btmp,evp_md);
 335                         if (out == NULL)
 336                                 out=btmp;
 337                         else
 338                                 BIO_push(out,btmp);
 339                         btmp=NULL;
 340                         }
 341                 }
 342
 343         if (evp_cipher != NULL)
 344                 {
 345 #if 0
 346                 unsigned char key[EVP_MAX_KEY_LENGTH];
 347                 unsigned char iv[EVP_MAX_IV_LENGTH];
 348                 unsigned char *p;
 349                 int keylen,ivlen;
 350                 int max;
 351                 X509_OBJECT ret;
 352 #endif
 353                 int jj;
 354
 355                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 356                         {
 357                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 358                         goto err;
 359                         }
 360
 361                 /* It was encrypted, we need to decrypt the secret key
 362                  * with the private key */
 363
 364                 /* Find the recipientInfo which matches the passed certificate
 365                  * (if any)
 366                  */
 367
 368                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 369                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 370                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 371                                         pcert->cert_info->issuer) &&
 372                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 373                                         ri->issuer_and_serial->serial)) break;
 374                         ri=NULL;
 375                 }
 376                 if (ri == NULL) {
 377                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 378                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 379                         return(NULL);
 380                 }
 381
 382                 jj=EVP_PKEY_size(pkey);
 383                 tmp=(unsigned char *)Malloc(jj+10);
 384                 if (tmp == NULL)
 385                         {
 386                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 387                         goto err;
 388                         }
 389
 390                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 391                         M_ASN1_STRING_length(ri->enc_key), pkey);
 392                 if (jj <= 0)
 393                         {
 394                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 395                         goto err;
 396                         }
 397
 398                 evp_ctx=NULL;
 399                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 400                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 401                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 402                         return(NULL);
 403
 404                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 405                         /* HACK: some S/MIME clients don't use the same key
 406                          * and effective key length. The key length is
 407                          * determined by the size of the decrypted RSA key.
 408                          * So we hack things to manually set the RC2 key
 409                          * because we currently can't do this with the EVP
 410                          * interface.
 411                          */
 412                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
 413                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
 414                         else {
 415
 416                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 417                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 418                                 goto err;
 419                         }
 420                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
 421
 422                 memset(tmp,0,jj);
 423
 424                 if (out == NULL)
 425                         out=etmp;
 426                 else
 427                         BIO_push(out,etmp);
 428                 etmp=NULL;
 429                 }
 430
 431 #if 1
 432         if (p7->detached || (in_bio != NULL))
 433                 {
 434                 bio=in_bio;
 435                 }
 436         else
 437                 {
 438 #if 0
 439                 bio=BIO_new(BIO_s_mem());
 440                 /* We need to set this so that when we have read all
 441                  * the data, the encrypt BIO, if present, will read
 442                  * EOF and encode the last few bytes */
 443                 BIO_set_mem_eof_return(bio,0);
 444
 445                 if (data_body->length > 0)
 446                         BIO_write(bio,(char *)data_body->data,data_body->length);
 447 #else
 448                 if (data_body->length > 0)
 449                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 450                 else {
 451                         bio=BIO_new(BIO_s_mem());
 452                         BIO_set_mem_eof_return(bio,0);
 453                 }
 454 #endif
 455                 }
 456         BIO_push(out,bio);
 457         bio=NULL;
 458 #endif
 459         if (0)
 460                 {
 461 err:
 462                 if (out != NULL) BIO_free_all(out);
 463                 if (btmp != NULL) BIO_free_all(btmp);
 464                 if (etmp != NULL) BIO_free_all(etmp);
 465                 if (bio != NULL) BIO_free_all(bio);
 466                 out=NULL;
 467                 }
 468         if (tmp != NULL)
 469                 Free(tmp);
 470         return(out);
 471         }
 472
 473 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 474         {
 475         int ret=0;
 476         int i,j;
 477         BIO *btmp;
 478         BUF_MEM *buf_mem=NULL;
 479         BUF_MEM *buf=NULL;
 480         PKCS7_SIGNER_INFO *si;
 481         EVP_MD_CTX *mdc,ctx_tmp;
 482         STACK_OF(X509_ATTRIBUTE) *sk;
 483         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 484         unsigned char *p,*pp=NULL;
 485         int x;
 486         ASN1_OCTET_STRING *os=NULL;
 487
 488         i=OBJ_obj2nid(p7->type);
 489         p7->state=PKCS7_S_HEADER;
 490
 491         switch (i)
 492                 {
 493         case NID_pkcs7_signedAndEnveloped:
 494                 /* XXXXXXXXXXXXXXXX */
 495                 si_sk=p7->d.signed_and_enveloped->signer_info;
 496                 os=M_ASN1_OCTET_STRING_new();
 497                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 498                 break;
 499         case NID_pkcs7_enveloped:
 500                 /* XXXXXXXXXXXXXXXX */
 501                 os=M_ASN1_OCTET_STRING_new();
 502                 p7->d.enveloped->enc_data->enc_data=os;
 503                 break;
 504         case NID_pkcs7_signed:
 505                 si_sk=p7->d.sign->signer_info;
 506                 os=p7->d.sign->contents->d.data;
 507                 /* If detached data then the content is excluded */
 508                 if(p7->detached) {
 509                         M_ASN1_OCTET_STRING_free(os);
 510                         p7->d.sign->contents->d.data = NULL;
 511                 }
 512                 break;
 513                 }
 514
 515         if (si_sk != NULL)
 516                 {
 517                 if ((buf=BUF_MEM_new()) == NULL)
 518                         {
 519                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 520                         goto err;
 521                         }
 522                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 523                         {
 524                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 525                         if (si->pkey == NULL) continue;
 526
 527                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 528
 529                         btmp=bio;
 530                         for (;;)
 531                                 {
 532                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 533                                         == NULL)
 534                                         {
 535                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 536                                         goto err;
 537                                         }
 538                                 BIO_get_md_ctx(btmp,&mdc);
 539                                 if (mdc == NULL)
 540                                         {
 541                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 542                                         goto err;
 543                                         }
 544                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 545                                         break;
 546                                 else
 547                                         btmp=btmp->next_bio;
 548                                 }
 549
 550                         /* We now have the EVP_MD_CTX, lets do the
 551                          * signing. */
 552                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 553                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 554                                 {
 555                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 556                                 goto err;
 557                                 }
 558
 559                         sk=si->auth_attr;
 560
 561                         /* If there are attributes, we add the digest
 562                          * attribute and only sign the attributes */
 563                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 564                                 {
 565                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 566                                 unsigned int md_len;
 567                                 ASN1_OCTET_STRING *digest;
 568                                 ASN1_UTCTIME *sign_time;
 569                                 const EVP_MD *md_tmp;
 570
 571                                 /* Add signing time */
 572                                 sign_time=X509_gmtime_adj(NULL,0);
 573                                 PKCS7_add_signed_attribute(si,
 574                                         NID_pkcs9_signingTime,
 575                                         V_ASN1_UTCTIME,sign_time);
 576
 577                                 /* Add digest */
 578                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 579                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 580                                 digest=M_ASN1_OCTET_STRING_new();
 581                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 582                                 PKCS7_add_signed_attribute(si,
 583                                         NID_pkcs9_messageDigest,
 584                                         V_ASN1_OCTET_STRING,digest);
 585
 586                                 /* Now sign the mess */
 587                                 EVP_SignInit(&ctx_tmp,md_tmp);
 588                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
 589                                            i2d_X509_ATTRIBUTE,
 590                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 591                                 pp=(unsigned char *)Malloc(x);
 592                                 p=pp;
 593                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
 594                                            i2d_X509_ATTRIBUTE,
 595                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 596                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 597                                 Free(pp);
 598                                 pp=NULL;
 599                                 }
 600
 601                         if (si->pkey->type == EVP_PKEY_DSA)
 602                                 ctx_tmp.digest=EVP_dss1();
 603
 604                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 605                                 (unsigned int *)&buf->length,si->pkey))
 606                                 {
 607                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 608                                 goto err;
 609                                 }
 610                         if (!ASN1_STRING_set(si->enc_digest,
 611                                 (unsigned char *)buf->data,buf->length))
 612                                 {
 613                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 614                                 goto err;
 615                                 }
 616                         }
 617                 }
 618
 619         if (!p7->detached)
 620                 {
 621                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 622                 if (btmp == NULL)
 623                         {
 624                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 625                         goto err;
 626                         }
 627                 BIO_get_mem_ptr(btmp,&buf_mem);
 628                 /* Mark the BIO read only then we can use its copy of the data
 629                  * instead of making an extra copy.
 630                  */
 631                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 632                 BIO_set_mem_eof_return(btmp, 0);
 633                 os->data = (unsigned char *)buf_mem->data;
 634                 os->length = buf_mem->length;
 635 #if 0
 636                 M_ASN1_OCTET_STRING_set(os,
 637                         (unsigned char *)buf_mem->data,buf_mem->length);
 638 #endif
 639                 }
 640         if (pp != NULL) Free(pp);
 641         pp=NULL;
 642
 643         ret=1;
 644 err:
 645         if (buf != NULL) BUF_MEM_free(buf);
 646         return(ret);
 647         }
 648
 649 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 650              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 651         {
 652         PKCS7_ISSUER_AND_SERIAL *ias;
 653         int ret=0,i;
 654         STACK_OF(X509) *cert;
 655         X509 *x509;
 656
 657         if (PKCS7_type_is_signed(p7))
 658                 {
 659                 cert=p7->d.sign->cert;
 660                 }
 661         else if (PKCS7_type_is_signedAndEnveloped(p7))
 662                 {
 663                 cert=p7->d.signed_and_enveloped->cert;
 664                 }
 665         else
 666                 {
 667                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 668                 goto err;
 669                 }
 670         /* XXXXXXXXXXXXXXXXXXXXXXX */
 671         ias=si->issuer_and_serial;
 672
 673         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 674
 675         /* were we able to find the cert in passed to us */
 676         if (x509 == NULL)
 677                 {
 678                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 679                 goto err;
 680                 }
 681
 682         /* Lets verify */
 683         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 684         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 685         i=X509_verify_cert(ctx);
 686         if (i <= 0)
 687                 {
 688                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 689                 goto err;
 690                 }
 691         X509_STORE_CTX_cleanup(ctx);
 692
 693         return PKCS7_signatureVerify(bio, p7, si, x509);
 694         err:
 695         return ret;
 696         }
 697
 698 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 699                                                                 X509 *x509)
 700         {
 701         ASN1_OCTET_STRING *os;
 702         EVP_MD_CTX mdc_tmp,*mdc;
 703         unsigned char *pp,*p;
 704         int ret=0,i;
 705         int md_type;
 706         STACK_OF(X509_ATTRIBUTE) *sk;
 707         BIO *btmp;
 708         EVP_PKEY *pkey;
 709
 710         if (!PKCS7_type_is_signed(p7) &&
 711                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 712                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 713                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 714                 goto err;
 715         }
 716
 717         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 718
 719         btmp=bio;
 720         for (;;)
 721                 {
 722                 if ((btmp == NULL) ||
 723                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 724                         {
 725                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 726                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 727                         goto err;
 728                         }
 729                 BIO_get_md_ctx(btmp,&mdc);
 730                 if (mdc == NULL)
 731                         {
 732                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 733                                                         PKCS7_R_INTERNAL_ERROR);
 734                         goto err;
 735                         }
 736                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 737                         break;
 738                 btmp=btmp->next_bio;
 739                 }
 740
 741         /* mdc is the digest ctx that we want, unless there are attributes,
 742          * in which case the digest is the signed attributes */
 743         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 744
 745         sk=si->auth_attr;
 746         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 747                 {
 748                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 749                 unsigned int md_len;
 750                 ASN1_OCTET_STRING *message_digest;
 751
 752                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 753                 message_digest=PKCS7_digest_from_attributes(sk);
 754                 if (!message_digest)
 755                         {
 756                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 757                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 758                         goto err;
 759                         }
 760                 if ((message_digest->length != (int)md_len) ||
 761                         (memcmp(message_digest->data,md_dat,md_len)))
 762                         {
 763 #if 0
 764 {
 765 int ii;
 766 for (ii=0; ii<message_digest->length; ii++)
 767         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 768 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 769 }
 770 #endif
 771                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 772                                                         PKCS7_R_DIGEST_FAILURE);
 773                         ret= -1;
 774                         goto err;
 775                         }
 776
 777                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 778                 /* Note: when forming the encoding of the attributes we
 779                  * shouldn't reorder them or this will break the signature.
 780                  * This is done by using the IS_SEQUENCE flag.
 781                  */
 782                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
 783                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 784                 pp=Malloc(i);
 785                 p=pp;
 786                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
 787                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 788                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 789
 790                 Free(pp);
 791                 }
 792
 793         os=si->enc_digest;
 794         pkey = X509_get_pubkey(x509);
 795         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 796
 797         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 798         EVP_PKEY_free(pkey);
 799         if (i <= 0)
 800                 {
 801                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 802                                                 PKCS7_R_SIGNATURE_FAILURE);
 803                 ret= -1;
 804                 goto err;
 805                 }
 806         else
 807                 ret=1;
 808 err:
 809         return(ret);
 810         }
 811
 812 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 813         {
 814         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 815         PKCS7_RECIP_INFO *ri;
 816         int i;
 817
 818         i=OBJ_obj2nid(p7->type);
 819         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 820         rsk=p7->d.signed_and_enveloped->recipientinfo;
 821         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 822         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 823         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 824         return(ri->issuer_and_serial);
 825         }
 826
 827 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 828         {
 829         return(get_attribute(si->auth_attr,nid));
 830         }
 831
 832 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 833         {
 834         return(get_attribute(si->unauth_attr,nid));
 835         }
 836
 837 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 838         {
 839         int i;
 840         X509_ATTRIBUTE *xa;
 841         ASN1_OBJECT *o;
 842
 843         o=OBJ_nid2obj(nid);
 844         if (!o || !sk) return(NULL);
 845         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 846                 {
 847                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 848                 if (OBJ_cmp(xa->object,o) == 0)
 849                         {
 850                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 851                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 852                         else
 853                                 return(NULL);
 854                         }
 855                 }
 856         return(NULL);
 857         }
 858
 859 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 860 {
 861         ASN1_TYPE *astype;
 862         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 863         return astype->value.octet_string;
 864 }
 865
 866 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 867                                 STACK_OF(X509_ATTRIBUTE) *sk)
 868         {
 869         int i;
 870
 871         if (p7si->auth_attr != NULL)
 872                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 873         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 874         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 875                 {
 876                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 877                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 878                     == NULL)
 879                         return(0);
 880                 }
 881         return(1);
 882         }
 883
 884 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 885         {
 886         int i;
 887
 888         if (p7si->unauth_attr != NULL)
 889                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 890                                            X509_ATTRIBUTE_free);
 891         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 892         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 893                 {
 894                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 895                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 896                     == NULL)
 897                         return(0);
 898                 }
 899         return(1);
 900         }
 901
 902 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 903              void *value)
 904         {
 905         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 906         }
 907
 908 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 909              void *value)
 910         {
 911         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 912         }
 913
 914 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 915                          void *value)
 916         {
 917         X509_ATTRIBUTE *attr=NULL;
 918
 919         if (*sk == NULL)
 920                 {
 921                 *sk = sk_X509_ATTRIBUTE_new(NULL);
 922 new_attrib:
 923                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 924                 sk_X509_ATTRIBUTE_push(*sk,attr);
 925                 }
 926         else
 927                 {
 928                 int i;
 929
 930                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 931                         {
 932                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 933                         if (OBJ_obj2nid(attr->object) == nid)
 934                                 {
 935                                 X509_ATTRIBUTE_free(attr);
 936                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 937                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 938                                 goto end;
 939                                 }
 940                         }
 941                 goto new_attrib;
 942                 }
 943 end:
 944         return(1);
 945         }
 946