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 **sk, int nid, int atrtype, void *value);
  66 static ASN1_TYPE *get_attribute(STACK *sk, int nid);
  67
  68 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
  69         {
  70         int i,j;
  71         BIO *out=NULL,*btmp=NULL;
  72         X509_ALGOR *xa;
  73         const EVP_MD *evp_md;
  74         const EVP_CIPHER *evp_cipher=NULL;
  75         STACK *md_sk=NULL,*rsk=NULL;
  76         X509_ALGOR *xalg=NULL;
  77         PKCS7_RECIP_INFO *ri=NULL;
  78         EVP_PKEY *pkey;
  79
  80         i=OBJ_obj2nid(p7->type);
  81         p7->state=PKCS7_S_HEADER;
  82
  83         switch (i)
  84                 {
  85         case NID_pkcs7_signed:
  86                 md_sk=p7->d.sign->md_algs;
  87                 break;
  88         case NID_pkcs7_signedAndEnveloped:
  89                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  90                 md_sk=p7->d.signed_and_enveloped->md_algs;
  91                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
  92                 if (evp_cipher == NULL)
  93                         {
  94                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
  95                         goto err;
  96                         }
  97                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  98                 break;
  99         case NID_pkcs7_enveloped:
 100                 rsk=p7->d.enveloped->recipientinfo;
 101                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.enveloped->enc_data->algorithm->algorithm)));
 102                 if (evp_cipher == NULL)
 103                         {
 104                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 105                         goto err;
 106                         }
 107                 xalg=p7->d.enveloped->enc_data->algorithm;
 108                 break;
 109         default:
 110                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 111                 goto err;
 112                 }
 113
 114         if (md_sk != NULL)
 115                 {
 116                 for (i=0; i<sk_num(md_sk); i++)
 117                         {
 118                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 119                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 120                                 {
 121                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 122                                 goto err;
 123                                 }
 124
 125                         j=OBJ_obj2nid(xa->algorithm);
 126                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 127                         if (evp_md == NULL)
 128                                 {
 129                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 130                                 goto err;
 131                                 }
 132
 133                         BIO_set_md(btmp,evp_md);
 134                         if (out == NULL)
 135                                 out=btmp;
 136                         else
 137                                 BIO_push(out,btmp);
 138                         btmp=NULL;
 139                         }
 140                 }
 141
 142         if (evp_cipher != NULL)
 143                 {
 144                 unsigned char key[EVP_MAX_KEY_LENGTH];
 145                 unsigned char iv[EVP_MAX_IV_LENGTH];
 146                 int keylen,ivlen;
 147                 int jj,max;
 148                 unsigned char *tmp;
 149
 150                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 151                         {
 152                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 153                         goto err;
 154                         }
 155                 keylen=EVP_CIPHER_key_length(evp_cipher);
 156                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 157
 158                 if (ivlen > 0) {
 159                         EVP_CIPHER_CTX *ctx;
 160                         BIO_get_cipher_ctx(btmp, &ctx);
 161                         if (xalg->parameter == NULL)
 162                                                 xalg->parameter=ASN1_TYPE_new();
 163                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 164                                                                        goto err;
 165                 }
 166                 RAND_bytes(key,keylen);
 167
 168                 /* Lets do the pub key stuff :-) */
 169                 max=0;
 170                 for (i=0; i<sk_num(rsk); i++)
 171                         {
 172                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 173                         if (ri->cert == NULL)
 174                                 {
 175                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 176                                 goto err;
 177                                 }
 178                         pkey=X509_get_pubkey(ri->cert);
 179                         jj=EVP_PKEY_size(pkey);
 180                         EVP_PKEY_free(pkey);
 181                         if (max < jj) max=jj;
 182                         }
 183                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 184                         {
 185                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 186                         goto err;
 187                         }
 188                 for (i=0; i<sk_num(rsk); i++)
 189                         {
 190                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 191                         pkey=X509_get_pubkey(ri->cert);
 192                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 193                         EVP_PKEY_free(pkey);
 194                         if (jj <= 0)
 195                                 {
 196                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 197                                 Free(tmp);
 198                                 goto err;
 199                                 }
 200                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 201                         }
 202                 Free(tmp);
 203
 204                 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
 205
 206                 if (out == NULL)
 207                         out=btmp;
 208                 else
 209                         BIO_push(out,btmp);
 210                 btmp=NULL;
 211                 }
 212
 213         if (bio == NULL) /* ??????????? */
 214                 {
 215                 if (p7->detached)
 216                         bio=BIO_new(BIO_s_null());
 217                 else
 218                         {
 219                         bio=BIO_new(BIO_s_mem());
 220                         /* We need to set this so that when we have read all
 221                          * the data, the encrypt BIO, if present, will read
 222                          * EOF and encode the last few bytes */
 223                         BIO_set_mem_eof_return(bio,0);
 224
 225                         if (PKCS7_type_is_signed(p7) &&
 226                                 PKCS7_type_is_data(p7->d.sign->contents))
 227                                 {
 228                                 ASN1_OCTET_STRING *os;
 229
 230                                 os=p7->d.sign->contents->d.data;
 231                                 if (os->length > 0)
 232                                         BIO_write(bio,(char *)os->data,
 233                                                 os->length);
 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,
 253              X509_STORE *xs)
 254         {
 255         int i,j;
 256         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 257         char *tmp=NULL;
 258         X509_ALGOR *xa;
 259         ASN1_OCTET_STRING *data_body=NULL;
 260         const EVP_MD *evp_md;
 261         const EVP_CIPHER *evp_cipher=NULL;
 262         EVP_CIPHER_CTX *evp_ctx=NULL;
 263         X509_ALGOR *enc_alg=NULL;
 264         STACK *md_sk=NULL,*rsk=NULL;
 265         X509_ALGOR *xalg=NULL;
 266         PKCS7_RECIP_INFO *ri=NULL;
 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_SIGNENVELOPEDECRYPT,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_SIGNENVELOPEDECRYPT,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_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 308                 goto err;
 309                 }
 310
 311         /* We will be checking the signature */
 312         if (md_sk != NULL)
 313                 {
 314                 for (i=0; i<sk_num(md_sk); i++)
 315                         {
 316                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 317                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 318                                 {
 319                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
 320                                 goto err;
 321                                 }
 322
 323                         j=OBJ_obj2nid(xa->algorithm);
 324                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 325                         if (evp_md == NULL)
 326                                 {
 327                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 328                                 goto err;
 329                                 }
 330
 331                         BIO_set_md(btmp,evp_md);
 332                         if (out == NULL)
 333                                 out=btmp;
 334                         else
 335                                 BIO_push(out,btmp);
 336                         btmp=NULL;
 337                         }
 338                 }
 339
 340         if (evp_cipher != NULL)
 341                 {
 342 #if 0
 343                 unsigned char key[EVP_MAX_KEY_LENGTH];
 344                 unsigned char iv[EVP_MAX_IV_LENGTH];
 345                 unsigned char *p;
 346                 int keylen,ivlen;
 347                 int max;
 348                 X509_OBJECT ret;
 349 #endif
 350                 int jj;
 351
 352                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 353                         {
 354                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
 355                         goto err;
 356                         }
 357
 358                 /* It was encrypted, we need to decrypt the secret key
 359                  * with the private key */
 360
 361                 /* We need to find a private key for one of the people in the
 362                  * recipentinfo list */
 363                 if (rsk == NULL)
 364                         return(NULL);
 365
 366                 /* FIXME: this assumes that the passed private key
 367                  * corresponds to the first RecipientInfo. This in
 368                  * general is not true
 369                  */
 370
 371                 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 372 #if 0
 373                 X509_STORE_CTX_init(&s_ctx,xs,NULL,NULL);
 374                 for (i=0; i<sk_num(rsk); i++)
 375                         {
 376                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 377                         uf (X509_STORE_get_by_issuer_serial(&s_ctx,
 378                                 X509_LU_PKEY,
 379                                 ri->issuer_and_serial->issuer,
 380                                 ri->issuer_and_serial->serial,
 381                                 &ret))
 382                                 break;
 383                         ri=NULL;
 384                         }
 385                 if (ri == NULL) return(NULL);
 386                 pkey=ret.data.pkey;
 387 #endif
 388                 if (pkey == NULL)
 389                         {
 390                         return(NULL);
 391                         }
 392
 393                 jj=EVP_PKEY_size(pkey);
 394                 tmp=Malloc(jj+10);
 395                 if (tmp == NULL)
 396                         {
 397                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_MALLOC_FAILURE);
 398                         goto err;
 399                         }
 400
 401                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
 402                         ASN1_STRING_data(ri->enc_key),
 403                         ASN1_STRING_length(ri->enc_key),
 404                         pkey);
 405                 if (jj <= 0)
 406                         {
 407                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_EVP_LIB);
 408                         goto err;
 409                         }
 410
 411                 evp_ctx=NULL;
 412                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 413                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 414                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 415                         return(NULL);
 416
 417                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
 418                         {
 419                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 420                         goto err;
 421                         }
 422                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
 423
 424                 memset(tmp,0,jj);
 425
 426                 if (out == NULL)
 427                         out=etmp;
 428                 else
 429                         BIO_push(out,etmp);
 430                 etmp=NULL;
 431                 }
 432
 433 #if 1
 434         if (p7->detached || (in_bio != NULL))
 435                 {
 436                 bio=in_bio;
 437                 }
 438         else
 439                 {
 440                 bio=BIO_new(BIO_s_mem());
 441                 /* We need to set this so that when we have read all
 442                  * the data, the encrypt BIO, if present, will read
 443                  * EOF and encode the last few bytes */
 444                 BIO_set_mem_eof_return(bio,0);
 445
 446                 if (data_body->length > 0)
 447                         BIO_write(bio,(char *)data_body->data,data_body->length);
 448                 }
 449         BIO_push(out,bio);
 450         bio=NULL;
 451 #endif
 452         if (0)
 453                 {
 454 err:
 455                 if (out != NULL) BIO_free_all(out);
 456                 if (btmp != NULL) BIO_free_all(btmp);
 457                 if (etmp != NULL) BIO_free_all(etmp);
 458                 if (bio != NULL) BIO_free_all(bio);
 459                 out=NULL;
 460                 }
 461         if (tmp != NULL)
 462                 Free(tmp);
 463         return(out);
 464         }
 465
 466 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 467         {
 468         int ret=0;
 469         int i,j;
 470         BIO *btmp;
 471         BUF_MEM *buf_mem=NULL;
 472         BUF_MEM *buf=NULL;
 473         PKCS7_SIGNER_INFO *si;
 474         EVP_MD_CTX *mdc,ctx_tmp;
 475         STACK *sk,*si_sk=NULL;
 476         unsigned char *p,*pp=NULL;
 477         int x;
 478         ASN1_OCTET_STRING *os=NULL;
 479
 480         i=OBJ_obj2nid(p7->type);
 481         p7->state=PKCS7_S_HEADER;
 482
 483         switch (i)
 484                 {
 485         case NID_pkcs7_signedAndEnveloped:
 486                 /* XXXXXXXXXXXXXXXX */
 487                 si_sk=p7->d.signed_and_enveloped->signer_info;
 488                 os=ASN1_OCTET_STRING_new();
 489                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 490                 break;
 491         case NID_pkcs7_enveloped:
 492                 /* XXXXXXXXXXXXXXXX */
 493                 os=ASN1_OCTET_STRING_new();
 494                 p7->d.enveloped->enc_data->enc_data=os;
 495                 break;
 496         case NID_pkcs7_signed:
 497                 si_sk=p7->d.sign->signer_info;
 498                 os=p7->d.sign->contents->d.data;
 499                 /* If detached data then the content is excluded */
 500                 if(p7->detached) {
 501                         ASN1_OCTET_STRING_free(os);
 502                         p7->d.sign->contents->d.data = NULL;
 503                 }
 504                 break;
 505                 }
 506
 507         if (si_sk != NULL)
 508                 {
 509                 if ((buf=BUF_MEM_new()) == NULL)
 510                         {
 511                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 512                         goto err;
 513                         }
 514                 for (i=0; i<sk_num(si_sk); i++)
 515                         {
 516                         si=(PKCS7_SIGNER_INFO *)
 517                                 sk_value(si_sk,i);
 518                         if (si->pkey == NULL) continue;
 519
 520                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 521
 522                         btmp=bio;
 523                         for (;;)
 524                                 {
 525                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 526                                         == NULL)
 527                                         {
 528                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 529                                         goto err;
 530                                         }
 531                                 BIO_get_md_ctx(btmp,&mdc);
 532                                 if (mdc == NULL)
 533                                         {
 534                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 535                                         goto err;
 536                                         }
 537                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 538                                         break;
 539                                 else
 540                                         btmp=btmp->next_bio;
 541                                 }
 542
 543                         /* We now have the EVP_MD_CTX, lets do the
 544                          * signing. */
 545                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 546                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 547                                 {
 548                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 549                                 goto err;
 550                                 }
 551
 552                         sk=si->auth_attr;
 553
 554                         /* If there are attributes, we add the digest
 555                          * attribute and only sign the attributes */
 556                         if ((sk != NULL) && (sk_num(sk) != 0))
 557                                 {
 558                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 559                                 unsigned int md_len;
 560                                 ASN1_OCTET_STRING *digest;
 561                                 ASN1_UTCTIME *sign_time;
 562                                 const EVP_MD *md_tmp;
 563
 564                                 /* Add signing time */
 565                                 sign_time=X509_gmtime_adj(NULL,0);
 566                                 PKCS7_add_signed_attribute(si,
 567                                         NID_pkcs9_signingTime,
 568                                         V_ASN1_UTCTIME,sign_time);
 569
 570                                 /* Add digest */
 571                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 572                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 573                                 digest=ASN1_OCTET_STRING_new();
 574                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
 575                                 PKCS7_add_signed_attribute(si,
 576                                         NID_pkcs9_messageDigest,
 577                                         V_ASN1_OCTET_STRING,digest);
 578
 579                                 /* Now sign the mess */
 580                                 EVP_SignInit(&ctx_tmp,md_tmp);
 581                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 582                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
 583                                 pp=(unsigned char *)Malloc(x);
 584                                 p=pp;
 585                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 586                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
 587                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 588                                 Free(pp);
 589                                 pp=NULL;
 590                                 }
 591
 592                         if (si->pkey->type == EVP_PKEY_DSA)
 593                                 ctx_tmp.digest=EVP_dss1();
 594
 595                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 596                                 (unsigned int *)&buf->length,si->pkey))
 597                                 {
 598                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 599                                 goto err;
 600                                 }
 601                         if (!ASN1_STRING_set(si->enc_digest,
 602                                 (unsigned char *)buf->data,buf->length))
 603                                 {
 604                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 605                                 goto err;
 606                                 }
 607                         }
 608                 }
 609
 610         if (!p7->detached)
 611                 {
 612                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 613                 if (btmp == NULL)
 614                         {
 615                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 616                         goto err;
 617                         }
 618                 BIO_get_mem_ptr(btmp,&buf_mem);
 619                 ASN1_OCTET_STRING_set(os,
 620                         (unsigned char *)buf_mem->data,buf_mem->length);
 621                 }
 622         if (pp != NULL) Free(pp);
 623         pp=NULL;
 624
 625         ret=1;
 626 err:
 627         if (buf != NULL) BUF_MEM_free(buf);
 628         return(ret);
 629         }
 630
 631 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 632              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 633         {
 634 /*      PKCS7_SIGNED *s; */
 635         ASN1_OCTET_STRING *os;
 636         EVP_MD_CTX mdc_tmp,*mdc;
 637         unsigned char *pp,*p;
 638         PKCS7_ISSUER_AND_SERIAL *ias;
 639         int ret=0,i;
 640         int md_type;
 641         STACK *sk;
 642         STACK_OF(X509) *cert;
 643         BIO *btmp;
 644         X509 *x509;
 645         EVP_PKEY *pkey;
 646
 647         if (PKCS7_type_is_signed(p7))
 648                 {
 649                 cert=p7->d.sign->cert;
 650                 }
 651         else if (PKCS7_type_is_signedAndEnveloped(p7))
 652                 {
 653                 cert=p7->d.signed_and_enveloped->cert;
 654                 }
 655         else
 656                 {
 657                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 658                 goto err;
 659                 }
 660         /* XXXXXXXXXXXXXXXXXXXXXXX */
 661         ias=si->issuer_and_serial;
 662
 663         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 664
 665         /* were we able to find the cert in passed to us */
 666         if (x509 == NULL)
 667                 {
 668                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 669                 goto err;
 670                 }
 671
 672         /* Lets verify */
 673         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 674         i=X509_verify_cert(ctx);
 675         if (i <= 0)
 676                 {
 677                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 678                 goto err;
 679                 }
 680         X509_STORE_CTX_cleanup(ctx);
 681
 682         /* So we like 'x509', lets check the signature. */
 683         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 684
 685         btmp=bio;
 686         for (;;)
 687                 {
 688                 if ((btmp == NULL) ||
 689                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 690                         {
 691                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 692                         goto err;
 693                         }
 694                 BIO_get_md_ctx(btmp,&mdc);
 695                 if (mdc == NULL)
 696                         {
 697                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
 698                         goto err;
 699                         }
 700                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 701                         break;
 702                 btmp=btmp->next_bio;
 703                 }
 704
 705         /* mdc is the digest ctx that we want, unless there are attributes,
 706          * in which case the digest is the signed attributes */
 707         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 708
 709         sk=si->auth_attr;
 710         if ((sk != NULL) && (sk_num(sk) != 0))
 711                 {
 712                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 713                 unsigned int md_len;
 714                 ASN1_OCTET_STRING *message_digest;
 715
 716                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 717                 message_digest=PKCS7_digest_from_attributes(sk);
 718                 if (!message_digest)
 719                         {
 720                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 721                         goto err;
 722                         }
 723                 if ((message_digest->length != (int)md_len) ||
 724                         (memcmp(message_digest->data,md_dat,md_len)))
 725                         {
 726 #if 0
 727 {
 728 int ii;
 729 for (ii=0; ii<message_digest->length; ii++)
 730         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 731 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 732 }
 733 #endif
 734                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
 735                         ret= -1;
 736                         goto err;
 737                         }
 738
 739                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 740                 /* Note: when forming the encoding of the attributes we
 741                  * shouldn't reorder them or this will break the signature.
 742                  * This is done by using the IS_SEQUENCE flag.
 743                  */
 744                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 745                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 746                 pp=(unsigned char *)Malloc(i);
 747                 p=pp;
 748                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 749                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 750                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 751
 752                 Free(pp);
 753                 }
 754
 755         os=si->enc_digest;
 756         pkey = X509_get_pubkey(x509);
 757         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 758
 759         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 760         EVP_PKEY_free(pkey);
 761         if (i <= 0)
 762                 {
 763                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
 764                 ret= -1;
 765                 goto err;
 766                 }
 767         else
 768                 ret=1;
 769 err:
 770         return(ret);
 771         }
 772
 773 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 774         {
 775         STACK *rsk;
 776         PKCS7_RECIP_INFO *ri;
 777         int i;
 778
 779         i=OBJ_obj2nid(p7->type);
 780         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 781         rsk=p7->d.signed_and_enveloped->recipientinfo;
 782         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 783         if (sk_num(rsk) <= idx) return(NULL);
 784         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
 785         return(ri->issuer_and_serial);
 786         }
 787
 788 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 789         {
 790         return(get_attribute(si->auth_attr,nid));
 791         }
 792
 793 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 794         {
 795         return(get_attribute(si->unauth_attr,nid));
 796         }
 797
 798 static ASN1_TYPE *get_attribute(STACK *sk, int nid)
 799         {
 800         int i;
 801         X509_ATTRIBUTE *xa;
 802         ASN1_OBJECT *o;
 803
 804         o=OBJ_nid2obj(nid);
 805         if (!o || !sk) return(NULL);
 806         for (i=0; i<sk_num(sk); i++)
 807                 {
 808                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
 809                 if (OBJ_cmp(xa->object,o) == 0)
 810                         {
 811                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 812                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 813                         else
 814                                 return(NULL);
 815                         }
 816                 }
 817         return(NULL);
 818         }
 819
 820 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK *sk)
 821 {
 822         ASN1_TYPE *astype;
 823         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 824         return astype->value.octet_string;
 825 }
 826
 827 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
 828         {
 829         int i;
 830
 831         if (p7si->auth_attr != NULL)
 832                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 833         p7si->auth_attr=sk_dup(sk);
 834         for (i=0; i<sk_num(sk); i++)
 835                 {
 836                 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 837                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 838                         return(0);
 839                 }
 840         return(1);
 841         }
 842
 843 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
 844         {
 845         int i;
 846
 847         if (p7si->unauth_attr != NULL)
 848                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
 849         p7si->unauth_attr=sk_dup(sk);
 850         for (i=0; i<sk_num(sk); i++)
 851                 {
 852                 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 853                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 854                         return(0);
 855                 }
 856         return(1);
 857         }
 858
 859 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 860              void *value)
 861         {
 862         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 863         }
 864
 865 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 866              void *value)
 867         {
 868         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 869         }
 870
 871 static int add_attribute(STACK **sk, int nid, int atrtype, void *value)
 872         {
 873         X509_ATTRIBUTE *attr=NULL;
 874
 875         if (*sk == NULL)
 876                 {
 877                 *sk = sk_new(NULL);
 878 new_attrib:
 879                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 880                 sk_push(*sk,(char *)attr);
 881                 }
 882         else
 883                 {
 884                 int i;
 885
 886                 for (i=0; i<sk_num(*sk); i++)
 887                         {
 888                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
 889                         if (OBJ_obj2nid(attr->object) == nid)
 890                                 {
 891                                 X509_ATTRIBUTE_free(attr);
 892                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 893                                 sk_value(*sk,i)=(char *)attr;
 894                                 goto end;
 895                                 }
 896                         }
 897                 goto new_attrib;
 898                 }
 899 end:
 900         return(1);
 901         }
 902