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 "rand.h"
  62 #include "objects.h"
  63 #include "x509.h"
  64
  65 static int add_attribute(STACK **sk, int nid, int atrtype, char *value);
  66 static ASN1_TYPE *get_attribute(STACK *sk, int nid);
  67
  68 #if 1
  69 BIO *PKCS7_dataInit(p7,bio)
  70 PKCS7 *p7;
  71 BIO *bio;
  72         {
  73         int i,j;
  74         BIO *out=NULL,*btmp=NULL;
  75         X509_ALGOR *xa;
  76         EVP_MD *evp_md;
  77         EVP_CIPHER *evp_cipher=NULL;
  78         STACK *md_sk=NULL,*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                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
  95                 if (evp_cipher == NULL)
  96                         {
  97                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
  98                         goto err;
  99                         }
 100                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 101                 break;
 102         case NID_pkcs7_enveloped:
 103                 rsk=p7->d.enveloped->recipientinfo;
 104                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.enveloped->enc_data->algorithm->algorithm)));
 105                 if (evp_cipher == NULL)
 106                         {
 107                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 108                         goto err;
 109                         }
 110                 xalg=p7->d.enveloped->enc_data->algorithm;
 111                 break;
 112         default:
 113                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 114                 goto err;
 115                 }
 116
 117         if (md_sk != NULL)
 118                 {
 119                 for (i=0; i<sk_num(md_sk); i++)
 120                         {
 121                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 122                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 123                                 {
 124                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 125                                 goto err;
 126                                 }
 127
 128                         j=OBJ_obj2nid(xa->algorithm);
 129                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 130                         if (evp_md == NULL)
 131                                 {
 132                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 133                                 goto err;
 134                                 }
 135
 136                         BIO_set_md(btmp,evp_md);
 137                         if (out == NULL)
 138                                 out=btmp;
 139                         else
 140                                 BIO_push(out,btmp);
 141                         btmp=NULL;
 142                         }
 143                 }
 144
 145         if (evp_cipher != NULL)
 146                 {
 147                 unsigned char key[EVP_MAX_KEY_LENGTH];
 148                 unsigned char iv[EVP_MAX_IV_LENGTH];
 149                 int keylen,ivlen;
 150                 int jj,max;
 151                 unsigned char *tmp;
 152
 153                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 154                         {
 155                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 156                         goto err;
 157                         }
 158                 keylen=EVP_CIPHER_key_length(evp_cipher);
 159                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 160
 161                 if (ivlen > 0)
 162                         {
 163                         ASN1_OCTET_STRING *os;
 164
 165                         RAND_bytes(iv,ivlen);
 166                         os=ASN1_OCTET_STRING_new();
 167                         ASN1_OCTET_STRING_set(os,iv,ivlen);
 168 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX this needs to change */
 169                         if (xalg->parameter == NULL)
 170                                 xalg->parameter=ASN1_TYPE_new();
 171                         ASN1_TYPE_set(xalg->parameter,V_ASN1_OCTET_STRING,
 172                                 (char *)os);
 173                         }
 174                 RAND_bytes(key,keylen);
 175
 176                 /* Lets do the pub key stuff :-) */
 177                 max=0;
 178                 for (i=0; i<sk_num(rsk); i++)
 179                         {
 180                         ri=(PKCS7_RECIP_INFO *)sk_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_num(rsk); i++)
 197                         {
 198                         ri=(PKCS7_RECIP_INFO *)sk_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                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 209                         }
 210                 Free(tmp);
 211
 212                 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
 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                 {
 223                 if (p7->detached)
 224                         bio=BIO_new(BIO_s_null());
 225                 else
 226                         {
 227                         bio=BIO_new(BIO_s_mem());
 228                         /* We need to set this so that when we have read all
 229                          * the data, the encrypt BIO, if present, will read
 230                          * EOF and encode the last few bytes */
 231                         BIO_set_mem_eof_return(bio,0);
 232
 233                         if (PKCS7_type_is_signed(p7) &&
 234                                 PKCS7_type_is_data(p7->d.sign->contents))
 235                                 {
 236                                 ASN1_OCTET_STRING *os;
 237
 238                                 os=p7->d.sign->contents->d.data;
 239                                 if (os->length > 0)
 240                                         BIO_write(bio,(char *)os->data,
 241                                                 os->length);
 242                                 }
 243                         }
 244                 }
 245         BIO_push(out,bio);
 246         bio=NULL;
 247         if (0)
 248                 {
 249 err:
 250                 if (out != NULL)
 251                         BIO_free_all(out);
 252                 if (btmp != NULL)
 253                         BIO_free_all(btmp);
 254                 out=NULL;
 255                 }
 256         return(out);
 257         }
 258
 259 /* int */
 260 BIO *PKCS7_dataDecode(p7,pkey,in_bio,xs)
 261 PKCS7 *p7;
 262 EVP_PKEY *pkey;
 263 BIO *in_bio;
 264 X509_STORE *xs;
 265         {
 266         int i,j;
 267         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 268         char *tmp=NULL;
 269         X509_ALGOR *xa;
 270         ASN1_OCTET_STRING *data_body=NULL;
 271         EVP_MD *evp_md;
 272         EVP_CIPHER *evp_cipher=NULL;
 273         EVP_CIPHER_CTX *evp_ctx=NULL;
 274         X509_ALGOR *enc_alg=NULL;
 275         STACK *md_sk=NULL,*rsk=NULL;
 276         X509_ALGOR *xalg=NULL;
 277         PKCS7_RECIP_INFO *ri=NULL;
 278 /*      EVP_PKEY *pkey; */
 279 #if 0
 280         X509_STORE_CTX s_ctx;
 281 #endif
 282
 283         i=OBJ_obj2nid(p7->type);
 284         p7->state=PKCS7_S_HEADER;
 285
 286         switch (i)
 287                 {
 288         case NID_pkcs7_signed:
 289                 data_body=p7->d.sign->contents->d.data;
 290                 md_sk=p7->d.sign->md_algs;
 291                 break;
 292         case NID_pkcs7_signedAndEnveloped:
 293                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 294                 md_sk=p7->d.signed_and_enveloped->md_algs;
 295                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 296                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 297                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 298                 if (evp_cipher == NULL)
 299                         {
 300                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 301                         goto err;
 302                         }
 303                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 304                 break;
 305         case NID_pkcs7_enveloped:
 306                 rsk=p7->d.enveloped->recipientinfo;
 307                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 308                 data_body=p7->d.enveloped->enc_data->enc_data;
 309                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 310                 if (evp_cipher == NULL)
 311                         {
 312                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 313                         goto err;
 314                         }
 315                 xalg=p7->d.enveloped->enc_data->algorithm;
 316                 break;
 317         default:
 318                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 319                 goto err;
 320                 }
 321
 322         /* We will be checking the signature */
 323         if (md_sk != NULL)
 324                 {
 325                 for (i=0; i<sk_num(md_sk); i++)
 326                         {
 327                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 328                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 329                                 {
 330                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
 331                                 goto err;
 332                                 }
 333
 334                         j=OBJ_obj2nid(xa->algorithm);
 335                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 336                         if (evp_md == NULL)
 337                                 {
 338                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 339                                 goto err;
 340                                 }
 341
 342                         BIO_set_md(btmp,evp_md);
 343                         if (out == NULL)
 344                                 out=btmp;
 345                         else
 346                                 BIO_push(out,btmp);
 347                         btmp=NULL;
 348                         }
 349                 }
 350
 351         if (evp_cipher != NULL)
 352                 {
 353 #if 0
 354                 unsigned char key[EVP_MAX_KEY_LENGTH];
 355                 unsigned char iv[EVP_MAX_IV_LENGTH];
 356                 unsigned char *p;
 357                 int keylen,ivlen;
 358                 int max;
 359                 X509_OBJECT ret;
 360 #endif
 361                 int jj;
 362
 363                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 364                         {
 365                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
 366                         goto err;
 367                         }
 368
 369                 /* It was encrypted, we need to decrypt the secret key
 370                  * with the private key */
 371
 372                 /* We need to find a private key for one of the people in the
 373                  * recipentinfo list */
 374                 if (rsk == NULL)
 375                         return(NULL);
 376
 377                 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 378 #if 0
 379                 X509_STORE_CTX_init(&s_ctx,xs,NULL,NULL);
 380                 for (i=0; i<sk_num(rsk); i++)
 381                         {
 382                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 383                         uf (X509_STORE_get_by_issuer_serial(&s_ctx,
 384                                 X509_LU_PKEY,
 385                                 ri->issuer_and_serial->issuer,
 386                                 ri->issuer_and_serial->serial,
 387                                 &ret))
 388                                 break;
 389                         ri=NULL;
 390                         }
 391                 if (ri == NULL) return(NULL);
 392                 pkey=ret.data.pkey;
 393 #endif
 394                 if (pkey == NULL)
 395                         {
 396                         return(NULL);
 397                         }
 398
 399                 jj=EVP_PKEY_size(pkey);
 400                 tmp=Malloc(jj+10);
 401                 if (tmp == NULL)
 402                         {
 403                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_MALLOC_FAILURE);
 404                         goto err;
 405                         }
 406
 407                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
 408                         ASN1_STRING_data(ri->enc_key),
 409                         ASN1_STRING_length(ri->enc_key),
 410                         pkey);
 411                 if (jj <= 0)
 412                         {
 413                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_EVP_LIB);
 414                         goto err;
 415                         }
 416
 417                 evp_ctx=NULL;
 418                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 419                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 420                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 421                         return(NULL);
 422
 423                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
 424                         {
 425                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 426                         goto err;
 427                         }
 428                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
 429
 430                 memset(tmp,0,jj);
 431
 432                 if (out == NULL)
 433                         out=etmp;
 434                 else
 435                         BIO_push(out,etmp);
 436                 etmp=NULL;
 437                 }
 438
 439 #if 1
 440         if (p7->detached || (in_bio != NULL))
 441                 {
 442                 bio=in_bio;
 443                 }
 444         else
 445                 {
 446                 bio=BIO_new(BIO_s_mem());
 447                 /* We need to set this so that when we have read all
 448                  * the data, the encrypt BIO, if present, will read
 449                  * EOF and encode the last few bytes */
 450                 BIO_set_mem_eof_return(bio,0);
 451
 452                 if (data_body->length > 0)
 453                         BIO_write(bio,(char *)data_body->data,data_body->length);
 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 #endif
 472
 473 int PKCS7_dataFinal(p7,bio)
 474 PKCS7 *p7;
 475 BIO *bio;
 476         {
 477         int ret=0;
 478         int i,j;
 479         BIO *btmp;
 480         BUF_MEM *buf_mem=NULL;
 481         BUF_MEM *buf=NULL;
 482         PKCS7_SIGNER_INFO *si;
 483         EVP_MD_CTX *mdc,ctx_tmp;
 484         STACK *sk,*si_sk=NULL;
 485         unsigned char *p,*pp=NULL;
 486         int x;
 487         ASN1_OCTET_STRING *os=NULL;
 488
 489         i=OBJ_obj2nid(p7->type);
 490         p7->state=PKCS7_S_HEADER;
 491
 492         switch (i)
 493                 {
 494         case NID_pkcs7_signedAndEnveloped:
 495                 /* XXXXXXXXXXXXXXXX */
 496                 si_sk=p7->d.signed_and_enveloped->signer_info;
 497                 os=ASN1_OCTET_STRING_new();
 498                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 499                 break;
 500         case NID_pkcs7_enveloped:
 501                 /* XXXXXXXXXXXXXXXX */
 502                 os=ASN1_OCTET_STRING_new();
 503                 p7->d.enveloped->enc_data->enc_data=os;
 504                 break;
 505         case NID_pkcs7_signed:
 506                 si_sk=p7->d.sign->signer_info;
 507                 os=p7->d.sign->contents->d.data;
 508                 /* If detached data then the content is excluded */
 509                 if(p7->detached) {
 510                         ASN1_OCTET_STRING_free(os);
 511                         p7->d.sign->contents->d.data = NULL;
 512                 }
 513                 break;
 514                 }
 515
 516         if (si_sk != NULL)
 517                 {
 518                 if ((buf=BUF_MEM_new()) == NULL)
 519                         {
 520                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 521                         goto err;
 522                         }
 523                 for (i=0; i<sk_num(si_sk); i++)
 524                         {
 525                         si=(PKCS7_SIGNER_INFO *)
 526                                 sk_value(si_sk,i);
 527                         if (si->pkey == NULL) continue;
 528
 529                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 530
 531                         btmp=bio;
 532                         for (;;)
 533                                 {
 534                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 535                                         == NULL)
 536                                         {
 537                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 538                                         goto err;
 539                                         }
 540                                 BIO_get_md_ctx(btmp,&mdc);
 541                                 if (mdc == NULL)
 542                                         {
 543                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 544                                         goto err;
 545                                         }
 546                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 547                                         break;
 548                                 else
 549                                         btmp=btmp->next_bio;
 550                                 }
 551
 552                         /* We now have the EVP_MD_CTX, lets do the
 553                          * signing. */
 554                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 555                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 556                                 {
 557                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 558                                 goto err;
 559                                 }
 560
 561                         sk=si->auth_attr;
 562
 563                         /* If there are attributes, we add the digest
 564                          * attribute and only sign the attributes */
 565                         if ((sk != NULL) && (sk_num(sk) != 0))
 566                                 {
 567                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 568                                 unsigned int md_len;
 569                                 ASN1_OCTET_STRING *digest;
 570                                 ASN1_UTCTIME *sign_time;
 571                                 EVP_MD *md_tmp;
 572
 573                                 /* Add signing time */
 574                                 sign_time=X509_gmtime_adj(NULL,0);
 575                                 PKCS7_add_signed_attribute(si,
 576                                         NID_pkcs9_signingTime,
 577                                         V_ASN1_UTCTIME,(char *)sign_time);
 578
 579                                 /* Add digest */
 580                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 581                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 582                                 digest=ASN1_OCTET_STRING_new();
 583                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
 584                                 PKCS7_add_signed_attribute(si,NID_pkcs9_messageDigest,
 585                                         V_ASN1_OCTET_STRING,(char *)digest);
 586
 587                                 /* Now sign the mess */
 588                                 EVP_SignInit(&ctx_tmp,md_tmp);
 589                                 x=i2d_ASN1_SET(sk,NULL,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(sk,&p,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                 ASN1_OCTET_STRING_set(os,
 628                         (unsigned char *)buf_mem->data,buf_mem->length);
 629                 }
 630         if (pp != NULL) Free(pp);
 631         pp=NULL;
 632
 633         ret=1;
 634 err:
 635         if (buf != NULL) BUF_MEM_free(buf);
 636         return(ret);
 637         }
 638
 639 int PKCS7_dataVerify(cert_store,ctx,bio,p7,si)
 640 X509_STORE *cert_store;
 641 X509_STORE_CTX *ctx;
 642 BIO *bio;
 643 PKCS7 *p7;
 644 PKCS7_SIGNER_INFO *si;
 645         {
 646 /*      PKCS7_SIGNED *s; */
 647         ASN1_OCTET_STRING *os;
 648         EVP_MD_CTX mdc_tmp,*mdc;
 649         unsigned char *pp,*p;
 650         PKCS7_ISSUER_AND_SERIAL *ias;
 651         int ret=0,i;
 652         int md_type;
 653         STACK *sk,*cert;
 654         BIO *btmp;
 655         X509 *x509;
 656         EVP_PKEY *pkey;
 657
 658         if (PKCS7_type_is_signed(p7))
 659                 {
 660                 cert=p7->d.sign->cert;
 661                 }
 662         else if (PKCS7_type_is_signedAndEnveloped(p7))
 663                 {
 664                 cert=p7->d.signed_and_enveloped->cert;
 665                 }
 666         else
 667                 {
 668                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 669                 goto err;
 670                 }
 671         /* XXXXXXXXXXXXXXXXXXXXXXX */
 672         ias=si->issuer_and_serial;
 673
 674         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 675
 676         /* were we able to find the cert in passed to us */
 677         if (x509 == NULL)
 678                 {
 679                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 680                 goto err;
 681                 }
 682
 683         /* Lets verify */
 684         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 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         /* So we like 'x509', lets check the signature. */
 694         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 695
 696         btmp=bio;
 697         for (;;)
 698                 {
 699                 if ((btmp == NULL) ||
 700                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 701                         {
 702                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 703                         goto err;
 704                         }
 705                 BIO_get_md_ctx(btmp,&mdc);
 706                 if (mdc == NULL)
 707                         {
 708                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
 709                         goto err;
 710                         }
 711                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 712                         break;
 713                 btmp=btmp->next_bio;
 714                 }
 715
 716         /* mdc is the digest ctx that we want, unless there are attributes,
 717          * in which case the digest is the signed attributes */
 718         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 719
 720         sk=si->auth_attr;
 721         if ((sk != NULL) && (sk_num(sk) != 0))
 722                 {
 723                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 724                 int md_len;
 725                 ASN1_OCTET_STRING *message_digest;
 726
 727                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 728                 message_digest=PKCS7_digest_from_attributes(sk);
 729                 if (!message_digest)
 730                         {
 731                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 732                         goto err;
 733                         }
 734                 if ((message_digest->length != md_len) ||
 735                         (memcmp(message_digest->data,md_dat,md_len)))
 736                         {
 737 #if 0
 738 {
 739 int ii;
 740 for (ii=0; ii<message_digest->length; ii++)
 741         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 742 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 743 }
 744 #endif
 745                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
 746                         ret= -1;
 747                         goto err;
 748                         }
 749
 750                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 751                 /* Note: when forming the encoding of the attributes we
 752                  * shouldn't reorder them or this will break the signature.
 753                  * This is done by using the IS_SEQUENCE flag.
 754                  */
 755                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 756                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 757                 pp=(unsigned char *)Malloc(i);
 758                 p=pp;
 759                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 760                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 761                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 762
 763                 Free(pp);
 764                 }
 765
 766         os=si->enc_digest;
 767         pkey = X509_get_pubkey(x509);
 768         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 769
 770         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 771         EVP_PKEY_free(pkey);
 772         if (i <= 0)
 773                 {
 774                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
 775                 ret= -1;
 776                 goto err;
 777                 }
 778         else
 779                 ret=1;
 780 err:
 781         return(ret);
 782         }
 783
 784 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(p7,idx)
 785 PKCS7 *p7;
 786 int idx;
 787         {
 788         STACK *rsk;
 789         PKCS7_RECIP_INFO *ri;
 790         int i;
 791
 792         i=OBJ_obj2nid(p7->type);
 793         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 794         rsk=p7->d.signed_and_enveloped->recipientinfo;
 795         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 796         if (sk_num(rsk) <= idx) return(NULL);
 797         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
 798         return(ri->issuer_and_serial);
 799         }
 800
 801 ASN1_TYPE *PKCS7_get_signed_attribute(si,nid)
 802 PKCS7_SIGNER_INFO *si;
 803 int nid;
 804         {
 805         return(get_attribute(si->auth_attr,nid));
 806         }
 807
 808 ASN1_TYPE *PKCS7_get_attribute(si,nid)
 809 PKCS7_SIGNER_INFO *si;
 810 int nid;
 811         {
 812         return(get_attribute(si->unauth_attr,nid));
 813         }
 814
 815 static ASN1_TYPE *get_attribute(sk,nid)
 816 STACK *sk;
 817 int nid;
 818         {
 819         int i;
 820         X509_ATTRIBUTE *xa;
 821         ASN1_OBJECT *o;
 822
 823         o=OBJ_nid2obj(nid);
 824         if (o == NULL) return(NULL);
 825         for (i=0; i<sk_num(sk); i++)
 826                 {
 827                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
 828                 if (OBJ_cmp(xa->object,o) == 0)
 829                         {
 830                         if (xa->set && sk_num(xa->value.set))
 831                                 return((ASN1_TYPE *)sk_value(xa->value.set,0));
 832                         else
 833                                 return(NULL);
 834                         }
 835                 }
 836         return(NULL);
 837         }
 838
 839 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(sk)
 840 STACK *sk;
 841         {
 842         X509_ATTRIBUTE *attr;
 843         ASN1_TYPE *astype;
 844         int i;
 845         if (!sk || !sk_num(sk)) return NULL;
 846         /* Search the attributes for a digest */
 847         for (i = 0; i < sk_num(sk); i++)
 848                 {
 849                 attr = (X509_ATTRIBUTE *) sk_value(sk, i);
 850                 if (OBJ_obj2nid(attr->object) == NID_pkcs9_messageDigest)
 851                         {
 852                         if (!attr->set) return NULL;
 853                         if (!attr->value.set ||
 854                                  !sk_num (attr->value.set) ) return NULL;
 855                         astype = (ASN1_TYPE *) sk_value(attr->value.set, 0);
 856                         return astype->value.octet_string;
 857                         }
 858                 }
 859         return NULL;
 860         }
 861
 862 int PKCS7_set_signed_attributes(p7si,sk)
 863 PKCS7_SIGNER_INFO *p7si;
 864 STACK *sk;
 865         {
 866         int i;
 867
 868         if (p7si->auth_attr != NULL)
 869                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 870         p7si->auth_attr=sk_dup(sk);
 871         for (i=0; i<sk_num(sk); i++)
 872                 {
 873                 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 874                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 875                         return(0);
 876                 }
 877         return(1);
 878         }
 879
 880 int PKCS7_set_attributes(p7si,sk)
 881 PKCS7_SIGNER_INFO *p7si;
 882 STACK *sk;
 883         {
 884         int i;
 885
 886         if (p7si->unauth_attr != NULL)
 887                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
 888         p7si->unauth_attr=sk_dup(sk);
 889         for (i=0; i<sk_num(sk); i++)
 890                 {
 891                 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 892                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 893                         return(0);
 894                 }
 895         return(1);
 896         }
 897
 898 int PKCS7_add_signed_attribute(p7si,nid,atrtype,value)
 899 PKCS7_SIGNER_INFO *p7si;
 900 int nid;
 901 int atrtype;
 902 char *value;
 903         {
 904         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 905         }
 906
 907 int PKCS7_add_attribute(p7si,nid,atrtype,value)
 908 PKCS7_SIGNER_INFO *p7si;
 909 int nid;
 910 int atrtype;
 911 char *value;
 912         {
 913         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 914         }
 915
 916 static int add_attribute(sk, nid, atrtype, value)
 917 STACK **sk;
 918 int nid;
 919 int atrtype;
 920 char *value;
 921         {
 922         X509_ATTRIBUTE *attr=NULL;
 923
 924         if (*sk == NULL)
 925                 {
 926                 *sk = sk_new(NULL);
 927 new_attrib:
 928                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 929                 sk_push(*sk,(char *)attr);
 930                 }
 931         else
 932                 {
 933                 int i;
 934
 935                 for (i=0; i<sk_num(*sk); i++)
 936                         {
 937                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
 938                         if (OBJ_obj2nid(attr->object) == nid)
 939                                 {
 940                                 X509_ATTRIBUTE_free(attr);
 941                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 942                                 sk_value(*sk,i)=(char *)attr;
 943                                 goto end;
 944                                 }
 945                         }
 946                 goto new_attrib;
 947                 }
 948 end:
 949         return(1);
 950         }
 951