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, char *value);
  66 static ASN1_TYPE *get_attribute(STACK *sk, int nid);
  67
  68 #if 1
  69 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
  70         {
  71         int i,j;
  72         BIO *out=NULL,*btmp=NULL;
  73         X509_ALGOR *xa;
  74         const EVP_MD *evp_md;
  75         const EVP_CIPHER *evp_cipher=NULL;
  76         STACK *md_sk=NULL,*rsk=NULL;
  77         X509_ALGOR *xalg=NULL;
  78         PKCS7_RECIP_INFO *ri=NULL;
  79         EVP_PKEY *pkey;
  80
  81         i=OBJ_obj2nid(p7->type);
  82         p7->state=PKCS7_S_HEADER;
  83
  84         switch (i)
  85                 {
  86         case NID_pkcs7_signed:
  87                 md_sk=p7->d.sign->md_algs;
  88                 break;
  89         case NID_pkcs7_signedAndEnveloped:
  90                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  91                 md_sk=p7->d.signed_and_enveloped->md_algs;
  92                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
  93                 if (evp_cipher == NULL)
  94                         {
  95                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
  96                         goto err;
  97                         }
  98                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  99                 break;
 100         case NID_pkcs7_enveloped:
 101                 rsk=p7->d.enveloped->recipientinfo;
 102                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.enveloped->enc_data->algorithm->algorithm)));
 103                 if (evp_cipher == NULL)
 104                         {
 105                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 106                         goto err;
 107                         }
 108                 xalg=p7->d.enveloped->enc_data->algorithm;
 109                 break;
 110         default:
 111                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 112                 goto err;
 113                 }
 114
 115         if (md_sk != NULL)
 116                 {
 117                 for (i=0; i<sk_num(md_sk); i++)
 118                         {
 119                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 120                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 121                                 {
 122                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 123                                 goto err;
 124                                 }
 125
 126                         j=OBJ_obj2nid(xa->algorithm);
 127                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 128                         if (evp_md == NULL)
 129                                 {
 130                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 131                                 goto err;
 132                                 }
 133
 134                         BIO_set_md(btmp,evp_md);
 135                         if (out == NULL)
 136                                 out=btmp;
 137                         else
 138                                 BIO_push(out,btmp);
 139                         btmp=NULL;
 140                         }
 141                 }
 142
 143         if (evp_cipher != NULL)
 144                 {
 145                 unsigned char key[EVP_MAX_KEY_LENGTH];
 146                 unsigned char iv[EVP_MAX_IV_LENGTH];
 147                 int keylen,ivlen;
 148                 int jj,max;
 149                 unsigned char *tmp;
 150
 151                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 152                         {
 153                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 154                         goto err;
 155                         }
 156                 keylen=EVP_CIPHER_key_length(evp_cipher);
 157                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 158
 159                 if (ivlen > 0)
 160                         {
 161                         ASN1_OCTET_STRING *os;
 162
 163                         RAND_bytes(iv,ivlen);
 164                         os=ASN1_OCTET_STRING_new();
 165                         ASN1_OCTET_STRING_set(os,iv,ivlen);
 166 /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX this needs to change */
 167                         if (xalg->parameter == NULL)
 168                                 xalg->parameter=ASN1_TYPE_new();
 169                         ASN1_TYPE_set(xalg->parameter,V_ASN1_OCTET_STRING,
 170                                 (char *)os);
 171                         }
 172                 RAND_bytes(key,keylen);
 173
 174                 /* Lets do the pub key stuff :-) */
 175                 max=0;
 176                 for (i=0; i<sk_num(rsk); i++)
 177                         {
 178                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 179                         if (ri->cert == NULL)
 180                                 {
 181                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 182                                 goto err;
 183                                 }
 184                         pkey=X509_get_pubkey(ri->cert);
 185                         jj=EVP_PKEY_size(pkey);
 186                         EVP_PKEY_free(pkey);
 187                         if (max < jj) max=jj;
 188                         }
 189                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 190                         {
 191                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 192                         goto err;
 193                         }
 194                 for (i=0; i<sk_num(rsk); i++)
 195                         {
 196                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 197                         pkey=X509_get_pubkey(ri->cert);
 198                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 199                         EVP_PKEY_free(pkey);
 200                         if (jj <= 0)
 201                                 {
 202                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 203                                 Free(tmp);
 204                                 goto err;
 205                                 }
 206                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 207                         }
 208                 Free(tmp);
 209
 210                 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
 211
 212                 if (out == NULL)
 213                         out=btmp;
 214                 else
 215                         BIO_push(out,btmp);
 216                 btmp=NULL;
 217                 }
 218
 219         if (bio == NULL) /* ??????????? */
 220                 {
 221                 if (p7->detached)
 222                         bio=BIO_new(BIO_s_null());
 223                 else
 224                         {
 225                         bio=BIO_new(BIO_s_mem());
 226                         /* We need to set this so that when we have read all
 227                          * the data, the encrypt BIO, if present, will read
 228                          * EOF and encode the last few bytes */
 229                         BIO_set_mem_eof_return(bio,0);
 230
 231                         if (PKCS7_type_is_signed(p7) &&
 232                                 PKCS7_type_is_data(p7->d.sign->contents))
 233                                 {
 234                                 ASN1_OCTET_STRING *os;
 235
 236                                 os=p7->d.sign->contents->d.data;
 237                                 if (os->length > 0)
 238                                         BIO_write(bio,(char *)os->data,
 239                                                 os->length);
 240                                 }
 241                         }
 242                 }
 243         BIO_push(out,bio);
 244         bio=NULL;
 245         if (0)
 246                 {
 247 err:
 248                 if (out != NULL)
 249                         BIO_free_all(out);
 250                 if (btmp != NULL)
 251                         BIO_free_all(btmp);
 252                 out=NULL;
 253                 }
 254         return(out);
 255         }
 256
 257 /* int */
 258 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio,
 259              X509_STORE *xs)
 260         {
 261         int i,j;
 262         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 263         char *tmp=NULL;
 264         X509_ALGOR *xa;
 265         ASN1_OCTET_STRING *data_body=NULL;
 266         const EVP_MD *evp_md;
 267         const EVP_CIPHER *evp_cipher=NULL;
 268         EVP_CIPHER_CTX *evp_ctx=NULL;
 269         X509_ALGOR *enc_alg=NULL;
 270         STACK *md_sk=NULL,*rsk=NULL;
 271         X509_ALGOR *xalg=NULL;
 272         PKCS7_RECIP_INFO *ri=NULL;
 273 /*      EVP_PKEY *pkey; */
 274 #if 0
 275         X509_STORE_CTX s_ctx;
 276 #endif
 277
 278         i=OBJ_obj2nid(p7->type);
 279         p7->state=PKCS7_S_HEADER;
 280
 281         switch (i)
 282                 {
 283         case NID_pkcs7_signed:
 284                 data_body=p7->d.sign->contents->d.data;
 285                 md_sk=p7->d.sign->md_algs;
 286                 break;
 287         case NID_pkcs7_signedAndEnveloped:
 288                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 289                 md_sk=p7->d.signed_and_enveloped->md_algs;
 290                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 291                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 292                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 293                 if (evp_cipher == NULL)
 294                         {
 295                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 296                         goto err;
 297                         }
 298                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 299                 break;
 300         case NID_pkcs7_enveloped:
 301                 rsk=p7->d.enveloped->recipientinfo;
 302                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 303                 data_body=p7->d.enveloped->enc_data->enc_data;
 304                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 305                 if (evp_cipher == NULL)
 306                         {
 307                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 308                         goto err;
 309                         }
 310                 xalg=p7->d.enveloped->enc_data->algorithm;
 311                 break;
 312         default:
 313                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 314                 goto err;
 315                 }
 316
 317         /* We will be checking the signature */
 318         if (md_sk != NULL)
 319                 {
 320                 for (i=0; i<sk_num(md_sk); i++)
 321                         {
 322                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 323                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 324                                 {
 325                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
 326                                 goto err;
 327                                 }
 328
 329                         j=OBJ_obj2nid(xa->algorithm);
 330                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 331                         if (evp_md == NULL)
 332                                 {
 333                                 PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 334                                 goto err;
 335                                 }
 336
 337                         BIO_set_md(btmp,evp_md);
 338                         if (out == NULL)
 339                                 out=btmp;
 340                         else
 341                                 BIO_push(out,btmp);
 342                         btmp=NULL;
 343                         }
 344                 }
 345
 346         if (evp_cipher != NULL)
 347                 {
 348 #if 0
 349                 unsigned char key[EVP_MAX_KEY_LENGTH];
 350                 unsigned char iv[EVP_MAX_IV_LENGTH];
 351                 unsigned char *p;
 352                 int keylen,ivlen;
 353                 int max;
 354                 X509_OBJECT ret;
 355 #endif
 356                 int jj;
 357
 358                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 359                         {
 360                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_BIO_LIB);
 361                         goto err;
 362                         }
 363
 364                 /* It was encrypted, we need to decrypt the secret key
 365                  * with the private key */
 366
 367                 /* We need to find a private key for one of the people in the
 368                  * recipentinfo list */
 369                 if (rsk == NULL)
 370                         return(NULL);
 371
 372                 ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 373 #if 0
 374                 X509_STORE_CTX_init(&s_ctx,xs,NULL,NULL);
 375                 for (i=0; i<sk_num(rsk); i++)
 376                         {
 377                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 378                         uf (X509_STORE_get_by_issuer_serial(&s_ctx,
 379                                 X509_LU_PKEY,
 380                                 ri->issuer_and_serial->issuer,
 381                                 ri->issuer_and_serial->serial,
 382                                 &ret))
 383                                 break;
 384                         ri=NULL;
 385                         }
 386                 if (ri == NULL) return(NULL);
 387                 pkey=ret.data.pkey;
 388 #endif
 389                 if (pkey == NULL)
 390                         {
 391                         return(NULL);
 392                         }
 393
 394                 jj=EVP_PKEY_size(pkey);
 395                 tmp=Malloc(jj+10);
 396                 if (tmp == NULL)
 397                         {
 398                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_MALLOC_FAILURE);
 399                         goto err;
 400                         }
 401
 402                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
 403                         ASN1_STRING_data(ri->enc_key),
 404                         ASN1_STRING_length(ri->enc_key),
 405                         pkey);
 406                 if (jj <= 0)
 407                         {
 408                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,ERR_R_EVP_LIB);
 409                         goto err;
 410                         }
 411
 412                 evp_ctx=NULL;
 413                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 414                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 415                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 416                         return(NULL);
 417
 418                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
 419                         {
 420                         PKCS7err(PKCS7_F_PKCS7_SIGNENVELOPEDECRYPT,PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 421                         goto err;
 422                         }
 423                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
 424
 425                 memset(tmp,0,jj);
 426
 427                 if (out == NULL)
 428                         out=etmp;
 429                 else
 430                         BIO_push(out,etmp);
 431                 etmp=NULL;
 432                 }
 433
 434 #if 1
 435         if (p7->detached || (in_bio != NULL))
 436                 {
 437                 bio=in_bio;
 438                 }
 439         else
 440                 {
 441                 bio=BIO_new(BIO_s_mem());
 442                 /* We need to set this so that when we have read all
 443                  * the data, the encrypt BIO, if present, will read
 444                  * EOF and encode the last few bytes */
 445                 BIO_set_mem_eof_return(bio,0);
 446
 447                 if (data_body->length > 0)
 448                         BIO_write(bio,(char *)data_body->data,data_body->length);
 449                 }
 450         BIO_push(out,bio);
 451         bio=NULL;
 452 #endif
 453         if (0)
 454                 {
 455 err:
 456                 if (out != NULL) BIO_free_all(out);
 457                 if (btmp != NULL) BIO_free_all(btmp);
 458                 if (etmp != NULL) BIO_free_all(etmp);
 459                 if (bio != NULL) BIO_free_all(bio);
 460                 out=NULL;
 461                 }
 462         if (tmp != NULL)
 463                 Free(tmp);
 464         return(out);
 465         }
 466 #endif
 467
 468 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 469         {
 470         int ret=0;
 471         int i,j;
 472         BIO *btmp;
 473         BUF_MEM *buf_mem=NULL;
 474         BUF_MEM *buf=NULL;
 475         PKCS7_SIGNER_INFO *si;
 476         EVP_MD_CTX *mdc,ctx_tmp;
 477         STACK *sk,*si_sk=NULL;
 478         unsigned char *p,*pp=NULL;
 479         int x;
 480         ASN1_OCTET_STRING *os=NULL;
 481
 482         i=OBJ_obj2nid(p7->type);
 483         p7->state=PKCS7_S_HEADER;
 484
 485         switch (i)
 486                 {
 487         case NID_pkcs7_signedAndEnveloped:
 488                 /* XXXXXXXXXXXXXXXX */
 489                 si_sk=p7->d.signed_and_enveloped->signer_info;
 490                 os=ASN1_OCTET_STRING_new();
 491                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 492                 break;
 493         case NID_pkcs7_enveloped:
 494                 /* XXXXXXXXXXXXXXXX */
 495                 os=ASN1_OCTET_STRING_new();
 496                 p7->d.enveloped->enc_data->enc_data=os;
 497                 break;
 498         case NID_pkcs7_signed:
 499                 si_sk=p7->d.sign->signer_info;
 500                 os=p7->d.sign->contents->d.data;
 501                 /* If detached data then the content is excluded */
 502                 if(p7->detached) {
 503                         ASN1_OCTET_STRING_free(os);
 504                         p7->d.sign->contents->d.data = NULL;
 505                 }
 506                 break;
 507                 }
 508
 509         if (si_sk != NULL)
 510                 {
 511                 if ((buf=BUF_MEM_new()) == NULL)
 512                         {
 513                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 514                         goto err;
 515                         }
 516                 for (i=0; i<sk_num(si_sk); i++)
 517                         {
 518                         si=(PKCS7_SIGNER_INFO *)
 519                                 sk_value(si_sk,i);
 520                         if (si->pkey == NULL) continue;
 521
 522                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 523
 524                         btmp=bio;
 525                         for (;;)
 526                                 {
 527                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 528                                         == NULL)
 529                                         {
 530                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 531                                         goto err;
 532                                         }
 533                                 BIO_get_md_ctx(btmp,&mdc);
 534                                 if (mdc == NULL)
 535                                         {
 536                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 537                                         goto err;
 538                                         }
 539                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 540                                         break;
 541                                 else
 542                                         btmp=btmp->next_bio;
 543                                 }
 544
 545                         /* We now have the EVP_MD_CTX, lets do the
 546                          * signing. */
 547                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 548                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 549                                 {
 550                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 551                                 goto err;
 552                                 }
 553
 554                         sk=si->auth_attr;
 555
 556                         /* If there are attributes, we add the digest
 557                          * attribute and only sign the attributes */
 558                         if ((sk != NULL) && (sk_num(sk) != 0))
 559                                 {
 560                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 561                                 unsigned int md_len;
 562                                 ASN1_OCTET_STRING *digest;
 563                                 ASN1_UTCTIME *sign_time;
 564                                 const EVP_MD *md_tmp;
 565
 566                                 /* Add signing time */
 567                                 sign_time=X509_gmtime_adj(NULL,0);
 568                                 PKCS7_add_signed_attribute(si,
 569                                         NID_pkcs9_signingTime,
 570                                         V_ASN1_UTCTIME,(char *)sign_time);
 571
 572                                 /* Add digest */
 573                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 574                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 575                                 digest=ASN1_OCTET_STRING_new();
 576                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
 577                                 PKCS7_add_signed_attribute(si,NID_pkcs9_messageDigest,
 578                                         V_ASN1_OCTET_STRING,(char *)digest);
 579
 580                                 /* Now sign the mess */
 581                                 EVP_SignInit(&ctx_tmp,md_tmp);
 582                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 583                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
 584                                 pp=(unsigned char *)Malloc(x);
 585                                 p=pp;
 586                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 587                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
 588                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 589                                 Free(pp);
 590                                 pp=NULL;
 591                                 }
 592
 593                         if (si->pkey->type == EVP_PKEY_DSA)
 594                                 ctx_tmp.digest=EVP_dss1();
 595
 596                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 597                                 (unsigned int *)&buf->length,si->pkey))
 598                                 {
 599                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 600                                 goto err;
 601                                 }
 602                         if (!ASN1_STRING_set(si->enc_digest,
 603                                 (unsigned char *)buf->data,buf->length))
 604                                 {
 605                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 606                                 goto err;
 607                                 }
 608                         }
 609                 }
 610
 611         if (!p7->detached)
 612                 {
 613                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 614                 if (btmp == NULL)
 615                         {
 616                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 617                         goto err;
 618                         }
 619                 BIO_get_mem_ptr(btmp,&buf_mem);
 620                 ASN1_OCTET_STRING_set(os,
 621                         (unsigned char *)buf_mem->data,buf_mem->length);
 622                 }
 623         if (pp != NULL) Free(pp);
 624         pp=NULL;
 625
 626         ret=1;
 627 err:
 628         if (buf != NULL) BUF_MEM_free(buf);
 629         return(ret);
 630         }
 631
 632 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 633              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 634         {
 635 /*      PKCS7_SIGNED *s; */
 636         ASN1_OCTET_STRING *os;
 637         EVP_MD_CTX mdc_tmp,*mdc;
 638         unsigned char *pp,*p;
 639         PKCS7_ISSUER_AND_SERIAL *ias;
 640         int ret=0,i;
 641         int md_type;
 642         STACK *sk;
 643         STACK_OF(X509) *cert;
 644         BIO *btmp;
 645         X509 *x509;
 646         EVP_PKEY *pkey;
 647
 648         if (PKCS7_type_is_signed(p7))
 649                 {
 650                 cert=p7->d.sign->cert;
 651                 }
 652         else if (PKCS7_type_is_signedAndEnveloped(p7))
 653                 {
 654                 cert=p7->d.signed_and_enveloped->cert;
 655                 }
 656         else
 657                 {
 658                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 659                 goto err;
 660                 }
 661         /* XXXXXXXXXXXXXXXXXXXXXXX */
 662         ias=si->issuer_and_serial;
 663
 664         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 665
 666         /* were we able to find the cert in passed to us */
 667         if (x509 == NULL)
 668                 {
 669                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 670                 goto err;
 671                 }
 672
 673         /* Lets verify */
 674         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 675         i=X509_verify_cert(ctx);
 676         if (i <= 0)
 677                 {
 678                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 679                 goto err;
 680                 }
 681         X509_STORE_CTX_cleanup(ctx);
 682
 683         /* So we like 'x509', lets check the signature. */
 684         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 685
 686         btmp=bio;
 687         for (;;)
 688                 {
 689                 if ((btmp == NULL) ||
 690                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 691                         {
 692                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 693                         goto err;
 694                         }
 695                 BIO_get_md_ctx(btmp,&mdc);
 696                 if (mdc == NULL)
 697                         {
 698                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
 699                         goto err;
 700                         }
 701                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 702                         break;
 703                 btmp=btmp->next_bio;
 704                 }
 705
 706         /* mdc is the digest ctx that we want, unless there are attributes,
 707          * in which case the digest is the signed attributes */
 708         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 709
 710         sk=si->auth_attr;
 711         if ((sk != NULL) && (sk_num(sk) != 0))
 712                 {
 713                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 714                 unsigned int md_len;
 715                 ASN1_OCTET_STRING *message_digest;
 716
 717                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 718                 message_digest=PKCS7_digest_from_attributes(sk);
 719                 if (!message_digest)
 720                         {
 721                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 722                         goto err;
 723                         }
 724                 if ((message_digest->length != (int)md_len) ||
 725                         (memcmp(message_digest->data,md_dat,md_len)))
 726                         {
 727 #if 0
 728 {
 729 int ii;
 730 for (ii=0; ii<message_digest->length; ii++)
 731         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 732 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 733 }
 734 #endif
 735                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
 736                         ret= -1;
 737                         goto err;
 738                         }
 739
 740                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 741                 /* Note: when forming the encoding of the attributes we
 742                  * shouldn't reorder them or this will break the signature.
 743                  * This is done by using the IS_SEQUENCE flag.
 744                  */
 745                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 746                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 747                 pp=(unsigned char *)Malloc(i);
 748                 p=pp;
 749                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 750                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 751                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 752
 753                 Free(pp);
 754                 }
 755
 756         os=si->enc_digest;
 757         pkey = X509_get_pubkey(x509);
 758         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 759
 760         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 761         EVP_PKEY_free(pkey);
 762         if (i <= 0)
 763                 {
 764                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
 765                 ret= -1;
 766                 goto err;
 767                 }
 768         else
 769                 ret=1;
 770 err:
 771         return(ret);
 772         }
 773
 774 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 775         {
 776         STACK *rsk;
 777         PKCS7_RECIP_INFO *ri;
 778         int i;
 779
 780         i=OBJ_obj2nid(p7->type);
 781         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 782         rsk=p7->d.signed_and_enveloped->recipientinfo;
 783         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 784         if (sk_num(rsk) <= idx) return(NULL);
 785         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
 786         return(ri->issuer_and_serial);
 787         }
 788
 789 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 790         {
 791         return(get_attribute(si->auth_attr,nid));
 792         }
 793
 794 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 795         {
 796         return(get_attribute(si->unauth_attr,nid));
 797         }
 798
 799 static ASN1_TYPE *get_attribute(STACK *sk, int nid)
 800         {
 801         int i;
 802         X509_ATTRIBUTE *xa;
 803         ASN1_OBJECT *o;
 804
 805         o=OBJ_nid2obj(nid);
 806         if (o == NULL) return(NULL);
 807         for (i=0; i<sk_num(sk); i++)
 808                 {
 809                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
 810                 if (OBJ_cmp(xa->object,o) == 0)
 811                         {
 812                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 813                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 814                         else
 815                                 return(NULL);
 816                         }
 817                 }
 818         return(NULL);
 819         }
 820
 821 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK *sk)
 822         {
 823         X509_ATTRIBUTE *attr;
 824         ASN1_TYPE *astype;
 825         int i;
 826         if (!sk || !sk_num(sk)) return NULL;
 827         /* Search the attributes for a digest */
 828         for (i = 0; i < sk_num(sk); i++)
 829                 {
 830                 attr = (X509_ATTRIBUTE *) sk_value(sk, i);
 831                 if (OBJ_obj2nid(attr->object) == NID_pkcs9_messageDigest)
 832                         {
 833                         if (!attr->set) return NULL;
 834                         if (!attr->value.set
 835                             || !sk_ASN1_TYPE_num(attr->value.set) )
 836                             return NULL;
 837                         astype = sk_ASN1_TYPE_value(attr->value.set, 0);
 838                         return astype->value.octet_string;
 839                         }
 840                 }
 841         return NULL;
 842         }
 843
 844 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
 845         {
 846         int i;
 847
 848         if (p7si->auth_attr != NULL)
 849                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 850         p7si->auth_attr=sk_dup(sk);
 851         for (i=0; i<sk_num(sk); i++)
 852                 {
 853                 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 854                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 855                         return(0);
 856                 }
 857         return(1);
 858         }
 859
 860 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
 861         {
 862         int i;
 863
 864         if (p7si->unauth_attr != NULL)
 865                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
 866         p7si->unauth_attr=sk_dup(sk);
 867         for (i=0; i<sk_num(sk); i++)
 868                 {
 869                 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 870                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 871                         return(0);
 872                 }
 873         return(1);
 874         }
 875
 876 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 877              char *value)
 878         {
 879         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 880         }
 881
 882 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 883              char *value)
 884         {
 885         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 886         }
 887
 888 static int add_attribute(STACK **sk, int nid, int atrtype, char *value)
 889         {
 890         X509_ATTRIBUTE *attr=NULL;
 891
 892         if (*sk == NULL)
 893                 {
 894                 *sk = sk_new(NULL);
 895 new_attrib:
 896                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 897                 sk_push(*sk,(char *)attr);
 898                 }
 899         else
 900                 {
 901                 int i;
 902
 903                 for (i=0; i<sk_num(*sk); i++)
 904                         {
 905                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
 906                         if (OBJ_obj2nid(attr->object) == nid)
 907                                 {
 908                                 X509_ATTRIBUTE_free(attr);
 909                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 910                                 sk_value(*sk,i)=(char *)attr;
 911                                 goto end;
 912                                 }
 913                         }
 914                 goto new_attrib;
 915                 }
 916 end:
 917         return(1);
 918         }
 919