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                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  92                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
  93                 if (evp_cipher == NULL)
  94                         {
  95                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
  96                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
  97                         goto err;
  98                         }
  99                 break;
 100         case NID_pkcs7_enveloped:
 101                 rsk=p7->d.enveloped->recipientinfo;
 102                 xalg=p7->d.enveloped->enc_data->algorithm;
 103                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 104                 if (evp_cipher == NULL)
 105                         {
 106                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 107                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 108                         goto err;
 109                         }
 110                 break;
 111         default:
 112                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 113                 goto err;
 114                 }
 115
 116         if (md_sk != NULL)
 117                 {
 118                 for (i=0; i<sk_num(md_sk); i++)
 119                         {
 120                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 121                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 122                                 {
 123                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 124                                 goto err;
 125                                 }
 126
 127                         j=OBJ_obj2nid(xa->algorithm);
 128                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 129                         if (evp_md == NULL)
 130                                 {
 131                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 132                                 goto err;
 133                                 }
 134
 135                         BIO_set_md(btmp,evp_md);
 136                         if (out == NULL)
 137                                 out=btmp;
 138                         else
 139                                 BIO_push(out,btmp);
 140                         btmp=NULL;
 141                         }
 142                 }
 143
 144         if (evp_cipher != NULL)
 145                 {
 146                 unsigned char key[EVP_MAX_KEY_LENGTH];
 147                 unsigned char iv[EVP_MAX_IV_LENGTH];
 148                 int keylen,ivlen;
 149                 int jj,max;
 150                 unsigned char *tmp;
 151                 EVP_CIPHER_CTX *ctx;
 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                 BIO_get_cipher_ctx(btmp, &ctx);
 159                 keylen=EVP_CIPHER_key_length(evp_cipher);
 160                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 161                 RAND_bytes(key,keylen);
 162                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 163                 if (ivlen > 0) RAND_bytes(iv,ivlen);
 164                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
 165
 166                 if (ivlen > 0) {
 167                         if (xalg->parameter == NULL)
 168                                                 xalg->parameter=ASN1_TYPE_new();
 169                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 170                                                                        goto err;
 171                 }
 172
 173                 /* Lets do the pub key stuff :-) */
 174                 max=0;
 175                 for (i=0; i<sk_num(rsk); i++)
 176                         {
 177                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 178                         if (ri->cert == NULL)
 179                                 {
 180                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 181                                 goto err;
 182                                 }
 183                         pkey=X509_get_pubkey(ri->cert);
 184                         jj=EVP_PKEY_size(pkey);
 185                         EVP_PKEY_free(pkey);
 186                         if (max < jj) max=jj;
 187                         }
 188                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 189                         {
 190                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 191                         goto err;
 192                         }
 193                 for (i=0; i<sk_num(rsk); i++)
 194                         {
 195                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 196                         pkey=X509_get_pubkey(ri->cert);
 197                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 198                         EVP_PKEY_free(pkey);
 199                         if (jj <= 0)
 200                                 {
 201                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 202                                 Free(tmp);
 203                                 goto err;
 204                                 }
 205                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 206                         }
 207                 Free(tmp);
 208                 memset(key, 0, keylen);
 209
 210                 if (out == NULL)
 211                         out=btmp;
 212                 else
 213                         BIO_push(out,btmp);
 214                 btmp=NULL;
 215                 }
 216
 217         if (bio == NULL) /* ??????????? */
 218                 {
 219                 if (p7->detached)
 220                         bio=BIO_new(BIO_s_null());
 221                 else
 222                         {
 223                         bio=BIO_new(BIO_s_mem());
 224                         /* We need to set this so that when we have read all
 225                          * the data, the encrypt BIO, if present, will read
 226                          * EOF and encode the last few bytes */
 227                         BIO_set_mem_eof_return(bio,0);
 228
 229                         if (PKCS7_type_is_signed(p7) &&
 230                                 PKCS7_type_is_data(p7->d.sign->contents))
 231                                 {
 232                                 ASN1_OCTET_STRING *os;
 233
 234                                 os=p7->d.sign->contents->d.data;
 235                                 if (os->length > 0)
 236                                         BIO_write(bio,(char *)os->data,
 237                                                 os->length);
 238                                 }
 239                         }
 240                 }
 241         BIO_push(out,bio);
 242         bio=NULL;
 243         if (0)
 244                 {
 245 err:
 246                 if (out != NULL)
 247                         BIO_free_all(out);
 248                 if (btmp != NULL)
 249                         BIO_free_all(btmp);
 250                 out=NULL;
 251                 }
 252         return(out);
 253         }
 254
 255 /* int */
 256 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 257         {
 258         int i,j;
 259         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 260         char *tmp=NULL;
 261         X509_ALGOR *xa;
 262         ASN1_OCTET_STRING *data_body=NULL;
 263         const EVP_MD *evp_md;
 264         const EVP_CIPHER *evp_cipher=NULL;
 265         EVP_CIPHER_CTX *evp_ctx=NULL;
 266         X509_ALGOR *enc_alg=NULL;
 267         STACK *md_sk=NULL,*rsk=NULL;
 268         X509_ALGOR *xalg=NULL;
 269         PKCS7_RECIP_INFO *ri=NULL;
 270 /*      EVP_PKEY *pkey; */
 271 #if 0
 272         X509_STORE_CTX s_ctx;
 273 #endif
 274
 275         i=OBJ_obj2nid(p7->type);
 276         p7->state=PKCS7_S_HEADER;
 277
 278         switch (i)
 279                 {
 280         case NID_pkcs7_signed:
 281                 data_body=p7->d.sign->contents->d.data;
 282                 md_sk=p7->d.sign->md_algs;
 283                 break;
 284         case NID_pkcs7_signedAndEnveloped:
 285                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 286                 md_sk=p7->d.signed_and_enveloped->md_algs;
 287                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 288                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 289                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 290                 if (evp_cipher == NULL)
 291                         {
 292                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 293                         goto err;
 294                         }
 295                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 296                 break;
 297         case NID_pkcs7_enveloped:
 298                 rsk=p7->d.enveloped->recipientinfo;
 299                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 300                 data_body=p7->d.enveloped->enc_data->enc_data;
 301                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 302                 if (evp_cipher == NULL)
 303                         {
 304                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 305                         goto err;
 306                         }
 307                 xalg=p7->d.enveloped->enc_data->algorithm;
 308                 break;
 309         default:
 310                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 311                 goto err;
 312                 }
 313
 314         /* We will be checking the signature */
 315         if (md_sk != NULL)
 316                 {
 317                 for (i=0; i<sk_num(md_sk); i++)
 318                         {
 319                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 320                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 321                                 {
 322                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 323                                 goto err;
 324                                 }
 325
 326                         j=OBJ_obj2nid(xa->algorithm);
 327                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 328                         if (evp_md == NULL)
 329                                 {
 330                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 331                                 goto err;
 332                                 }
 333
 334                         BIO_set_md(btmp,evp_md);
 335                         if (out == NULL)
 336                                 out=btmp;
 337                         else
 338                                 BIO_push(out,btmp);
 339                         btmp=NULL;
 340                         }
 341                 }
 342
 343         if (evp_cipher != NULL)
 344                 {
 345 #if 0
 346                 unsigned char key[EVP_MAX_KEY_LENGTH];
 347                 unsigned char iv[EVP_MAX_IV_LENGTH];
 348                 unsigned char *p;
 349                 int keylen,ivlen;
 350                 int max;
 351                 X509_OBJECT ret;
 352 #endif
 353                 int jj;
 354
 355                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 356                         {
 357                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 358                         goto err;
 359                         }
 360
 361                 /* It was encrypted, we need to decrypt the secret key
 362                  * with the private key */
 363
 364                 /* Find the recipientInfo which matches the passed certificate
 365                  * (if any)
 366                  */
 367
 368                 for (i=0; i<sk_num(rsk); i++) {
 369                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 370                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 371                                         pcert->cert_info->issuer) &&
 372                              !ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 373                                         ri->issuer_and_serial->serial)) break;
 374                         ri=NULL;
 375                 }
 376                 if (ri == NULL) {
 377                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 378                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 379                         return(NULL);
 380                 }
 381
 382                 jj=EVP_PKEY_size(pkey);
 383                 tmp=Malloc(jj+10);
 384                 if (tmp == NULL)
 385                         {
 386                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 387                         goto err;
 388                         }
 389
 390                 jj=EVP_PKEY_decrypt((unsigned char *)tmp,
 391                         ASN1_STRING_data(ri->enc_key),
 392                         ASN1_STRING_length(ri->enc_key),
 393                         pkey);
 394                 if (jj <= 0)
 395                         {
 396                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 397                         goto err;
 398                         }
 399
 400                 evp_ctx=NULL;
 401                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 402                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 403                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 404                         return(NULL);
 405
 406                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx))
 407                         {
 408                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 409                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 410                         goto err;
 411                         }
 412                 EVP_CipherInit(evp_ctx,NULL,(unsigned char *)tmp,NULL,0);
 413
 414                 memset(tmp,0,jj);
 415
 416                 if (out == NULL)
 417                         out=etmp;
 418                 else
 419                         BIO_push(out,etmp);
 420                 etmp=NULL;
 421                 }
 422
 423 #if 1
 424         if (p7->detached || (in_bio != NULL))
 425                 {
 426                 bio=in_bio;
 427                 }
 428         else
 429                 {
 430                 bio=BIO_new(BIO_s_mem());
 431                 /* We need to set this so that when we have read all
 432                  * the data, the encrypt BIO, if present, will read
 433                  * EOF and encode the last few bytes */
 434                 BIO_set_mem_eof_return(bio,0);
 435
 436                 if (data_body->length > 0)
 437                         BIO_write(bio,(char *)data_body->data,data_body->length);
 438                 }
 439         BIO_push(out,bio);
 440         bio=NULL;
 441 #endif
 442         if (0)
 443                 {
 444 err:
 445                 if (out != NULL) BIO_free_all(out);
 446                 if (btmp != NULL) BIO_free_all(btmp);
 447                 if (etmp != NULL) BIO_free_all(etmp);
 448                 if (bio != NULL) BIO_free_all(bio);
 449                 out=NULL;
 450                 }
 451         if (tmp != NULL)
 452                 Free(tmp);
 453         return(out);
 454         }
 455
 456 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 457         {
 458         int ret=0;
 459         int i,j;
 460         BIO *btmp;
 461         BUF_MEM *buf_mem=NULL;
 462         BUF_MEM *buf=NULL;
 463         PKCS7_SIGNER_INFO *si;
 464         EVP_MD_CTX *mdc,ctx_tmp;
 465         STACK *sk,*si_sk=NULL;
 466         unsigned char *p,*pp=NULL;
 467         int x;
 468         ASN1_OCTET_STRING *os=NULL;
 469
 470         i=OBJ_obj2nid(p7->type);
 471         p7->state=PKCS7_S_HEADER;
 472
 473         switch (i)
 474                 {
 475         case NID_pkcs7_signedAndEnveloped:
 476                 /* XXXXXXXXXXXXXXXX */
 477                 si_sk=p7->d.signed_and_enveloped->signer_info;
 478                 os=ASN1_OCTET_STRING_new();
 479                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 480                 break;
 481         case NID_pkcs7_enveloped:
 482                 /* XXXXXXXXXXXXXXXX */
 483                 os=ASN1_OCTET_STRING_new();
 484                 p7->d.enveloped->enc_data->enc_data=os;
 485                 break;
 486         case NID_pkcs7_signed:
 487                 si_sk=p7->d.sign->signer_info;
 488                 os=p7->d.sign->contents->d.data;
 489                 /* If detached data then the content is excluded */
 490                 if(p7->detached) {
 491                         ASN1_OCTET_STRING_free(os);
 492                         p7->d.sign->contents->d.data = NULL;
 493                 }
 494                 break;
 495                 }
 496
 497         if (si_sk != NULL)
 498                 {
 499                 if ((buf=BUF_MEM_new()) == NULL)
 500                         {
 501                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 502                         goto err;
 503                         }
 504                 for (i=0; i<sk_num(si_sk); i++)
 505                         {
 506                         si=(PKCS7_SIGNER_INFO *)
 507                                 sk_value(si_sk,i);
 508                         if (si->pkey == NULL) continue;
 509
 510                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 511
 512                         btmp=bio;
 513                         for (;;)
 514                                 {
 515                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 516                                         == NULL)
 517                                         {
 518                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 519                                         goto err;
 520                                         }
 521                                 BIO_get_md_ctx(btmp,&mdc);
 522                                 if (mdc == NULL)
 523                                         {
 524                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 525                                         goto err;
 526                                         }
 527                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 528                                         break;
 529                                 else
 530                                         btmp=btmp->next_bio;
 531                                 }
 532
 533                         /* We now have the EVP_MD_CTX, lets do the
 534                          * signing. */
 535                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 536                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 537                                 {
 538                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 539                                 goto err;
 540                                 }
 541
 542                         sk=si->auth_attr;
 543
 544                         /* If there are attributes, we add the digest
 545                          * attribute and only sign the attributes */
 546                         if ((sk != NULL) && (sk_num(sk) != 0))
 547                                 {
 548                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 549                                 unsigned int md_len;
 550                                 ASN1_OCTET_STRING *digest;
 551                                 ASN1_UTCTIME *sign_time;
 552                                 const EVP_MD *md_tmp;
 553
 554                                 /* Add signing time */
 555                                 sign_time=X509_gmtime_adj(NULL,0);
 556                                 PKCS7_add_signed_attribute(si,
 557                                         NID_pkcs9_signingTime,
 558                                         V_ASN1_UTCTIME,sign_time);
 559
 560                                 /* Add digest */
 561                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 562                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 563                                 digest=ASN1_OCTET_STRING_new();
 564                                 ASN1_OCTET_STRING_set(digest,md_data,md_len);
 565                                 PKCS7_add_signed_attribute(si,
 566                                         NID_pkcs9_messageDigest,
 567                                         V_ASN1_OCTET_STRING,digest);
 568
 569                                 /* Now sign the mess */
 570                                 EVP_SignInit(&ctx_tmp,md_tmp);
 571                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 572                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
 573                                 pp=(unsigned char *)Malloc(x);
 574                                 p=pp;
 575                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 576                                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SET);
 577                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 578                                 Free(pp);
 579                                 pp=NULL;
 580                                 }
 581
 582                         if (si->pkey->type == EVP_PKEY_DSA)
 583                                 ctx_tmp.digest=EVP_dss1();
 584
 585                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 586                                 (unsigned int *)&buf->length,si->pkey))
 587                                 {
 588                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 589                                 goto err;
 590                                 }
 591                         if (!ASN1_STRING_set(si->enc_digest,
 592                                 (unsigned char *)buf->data,buf->length))
 593                                 {
 594                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 595                                 goto err;
 596                                 }
 597                         }
 598                 }
 599
 600         if (!p7->detached)
 601                 {
 602                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 603                 if (btmp == NULL)
 604                         {
 605                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 606                         goto err;
 607                         }
 608                 BIO_get_mem_ptr(btmp,&buf_mem);
 609                 ASN1_OCTET_STRING_set(os,
 610                         (unsigned char *)buf_mem->data,buf_mem->length);
 611                 }
 612         if (pp != NULL) Free(pp);
 613         pp=NULL;
 614
 615         ret=1;
 616 err:
 617         if (buf != NULL) BUF_MEM_free(buf);
 618         return(ret);
 619         }
 620
 621 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 622              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 623         {
 624 /*      PKCS7_SIGNED *s; */
 625         ASN1_OCTET_STRING *os;
 626         EVP_MD_CTX mdc_tmp,*mdc;
 627         unsigned char *pp,*p;
 628         PKCS7_ISSUER_AND_SERIAL *ias;
 629         int ret=0,i;
 630         int md_type;
 631         STACK *sk;
 632         STACK_OF(X509) *cert;
 633         BIO *btmp;
 634         X509 *x509;
 635         EVP_PKEY *pkey;
 636
 637         if (PKCS7_type_is_signed(p7))
 638                 {
 639                 cert=p7->d.sign->cert;
 640                 }
 641         else if (PKCS7_type_is_signedAndEnveloped(p7))
 642                 {
 643                 cert=p7->d.signed_and_enveloped->cert;
 644                 }
 645         else
 646                 {
 647                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 648                 goto err;
 649                 }
 650         /* XXXXXXXXXXXXXXXXXXXXXXX */
 651         ias=si->issuer_and_serial;
 652
 653         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 654
 655         /* were we able to find the cert in passed to us */
 656         if (x509 == NULL)
 657                 {
 658                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 659                 goto err;
 660                 }
 661
 662         /* Lets verify */
 663         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 664         i=X509_verify_cert(ctx);
 665         if (i <= 0)
 666                 {
 667                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 668                 goto err;
 669                 }
 670         X509_STORE_CTX_cleanup(ctx);
 671
 672         /* So we like 'x509', lets check the signature. */
 673         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 674
 675         btmp=bio;
 676         for (;;)
 677                 {
 678                 if ((btmp == NULL) ||
 679                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 680                         {
 681                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 682                         goto err;
 683                         }
 684                 BIO_get_md_ctx(btmp,&mdc);
 685                 if (mdc == NULL)
 686                         {
 687                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
 688                         goto err;
 689                         }
 690                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 691                         break;
 692                 btmp=btmp->next_bio;
 693                 }
 694
 695         /* mdc is the digest ctx that we want, unless there are attributes,
 696          * in which case the digest is the signed attributes */
 697         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 698
 699         sk=si->auth_attr;
 700         if ((sk != NULL) && (sk_num(sk) != 0))
 701                 {
 702                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 703                 unsigned int md_len;
 704                 ASN1_OCTET_STRING *message_digest;
 705
 706                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 707                 message_digest=PKCS7_digest_from_attributes(sk);
 708                 if (!message_digest)
 709                         {
 710                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 711                         goto err;
 712                         }
 713                 if ((message_digest->length != (int)md_len) ||
 714                         (memcmp(message_digest->data,md_dat,md_len)))
 715                         {
 716 #if 0
 717 {
 718 int ii;
 719 for (ii=0; ii<message_digest->length; ii++)
 720         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 721 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 722 }
 723 #endif
 724                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_DIGEST_FAILURE);
 725                         ret= -1;
 726                         goto err;
 727                         }
 728
 729                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 730                 /* Note: when forming the encoding of the attributes we
 731                  * shouldn't reorder them or this will break the signature.
 732                  * This is done by using the IS_SEQUENCE flag.
 733                  */
 734                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 735                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 736                 pp=(unsigned char *)Malloc(i);
 737                 p=pp;
 738                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 739                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 740                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 741
 742                 Free(pp);
 743                 }
 744
 745         os=si->enc_digest;
 746         pkey = X509_get_pubkey(x509);
 747         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 748
 749         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 750         EVP_PKEY_free(pkey);
 751         if (i <= 0)
 752                 {
 753                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
 754                 ret= -1;
 755                 goto err;
 756                 }
 757         else
 758                 ret=1;
 759 err:
 760         return(ret);
 761         }
 762
 763 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 764         {
 765         STACK *rsk;
 766         PKCS7_RECIP_INFO *ri;
 767         int i;
 768
 769         i=OBJ_obj2nid(p7->type);
 770         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 771         rsk=p7->d.signed_and_enveloped->recipientinfo;
 772         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,0);
 773         if (sk_num(rsk) <= idx) return(NULL);
 774         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,idx);
 775         return(ri->issuer_and_serial);
 776         }
 777
 778 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 779         {
 780         return(get_attribute(si->auth_attr,nid));
 781         }
 782
 783 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 784         {
 785         return(get_attribute(si->unauth_attr,nid));
 786         }
 787
 788 static ASN1_TYPE *get_attribute(STACK *sk, int nid)
 789         {
 790         int i;
 791         X509_ATTRIBUTE *xa;
 792         ASN1_OBJECT *o;
 793
 794         o=OBJ_nid2obj(nid);
 795         if (!o || !sk) return(NULL);
 796         for (i=0; i<sk_num(sk); i++)
 797                 {
 798                 xa=(X509_ATTRIBUTE *)sk_value(sk,i);
 799                 if (OBJ_cmp(xa->object,o) == 0)
 800                         {
 801                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 802                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 803                         else
 804                                 return(NULL);
 805                         }
 806                 }
 807         return(NULL);
 808         }
 809
 810 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK *sk)
 811 {
 812         ASN1_TYPE *astype;
 813         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 814         return astype->value.octet_string;
 815 }
 816
 817 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
 818         {
 819         int i;
 820
 821         if (p7si->auth_attr != NULL)
 822                 sk_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 823         p7si->auth_attr=sk_dup(sk);
 824         for (i=0; i<sk_num(sk); i++)
 825                 {
 826                 if ((sk_value(p7si->auth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 827                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 828                         return(0);
 829                 }
 830         return(1);
 831         }
 832
 833 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK *sk)
 834         {
 835         int i;
 836
 837         if (p7si->unauth_attr != NULL)
 838                 sk_pop_free(p7si->unauth_attr,X509_ATTRIBUTE_free);
 839         p7si->unauth_attr=sk_dup(sk);
 840         for (i=0; i<sk_num(sk); i++)
 841                 {
 842                 if ((sk_value(p7si->unauth_attr,i)=(char *)X509_ATTRIBUTE_dup(
 843                         (X509_ATTRIBUTE *)sk_value(sk,i))) == NULL)
 844                         return(0);
 845                 }
 846         return(1);
 847         }
 848
 849 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 850              void *value)
 851         {
 852         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 853         }
 854
 855 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 856              void *value)
 857         {
 858         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 859         }
 860
 861 static int add_attribute(STACK **sk, int nid, int atrtype, void *value)
 862         {
 863         X509_ATTRIBUTE *attr=NULL;
 864
 865         if (*sk == NULL)
 866                 {
 867                 *sk = sk_new(NULL);
 868 new_attrib:
 869                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 870                 sk_push(*sk,(char *)attr);
 871                 }
 872         else
 873                 {
 874                 int i;
 875
 876                 for (i=0; i<sk_num(*sk); i++)
 877                         {
 878                         attr=(X509_ATTRIBUTE *)sk_value(*sk,i);
 879                         if (OBJ_obj2nid(attr->object) == nid)
 880                                 {
 881                                 X509_ATTRIBUTE_free(attr);
 882                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 883                                 sk_value(*sk,i)=(char *)attr;
 884                                 goto end;
 885                                 }
 886                         }
 887                 goto new_attrib;
 888                 }
 889 end:
 890         return(1);
 891         }
 892