crypto/pkcs7/pk7_doit.c

   1 /* crypto/pkcs7/pk7_doit.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/rand.h>
  62 #include <openssl/objects.h>
  63 #include <openssl/x509.h>
  64 #include <openssl/x509v3.h>
  65
  66 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
  67                          void *value);
  68 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
  69
  70 static int PKCS7_type_is_other(PKCS7* p7)
  71         {
  72         int isOther=1;
  73
  74         int nid=OBJ_obj2nid(p7->type);
  75
  76         switch( nid )
  77                 {
  78         case NID_pkcs7_data:
  79         case NID_pkcs7_signed:
  80         case NID_pkcs7_enveloped:
  81         case NID_pkcs7_signedAndEnveloped:
  82         case NID_pkcs7_digest:
  83         case NID_pkcs7_encrypted:
  84                 isOther=0;
  85                 break;
  86         default:
  87                 isOther=1;
  88                 }
  89
  90         return isOther;
  91
  92         }
  93
  94 static int PKCS7_type_is_octet_string(PKCS7* p7)
  95         {
  96         if ( 0==PKCS7_type_is_other(p7) )
  97                 return 0;
  98
  99         return (V_ASN1_OCTET_STRING==p7->d.other->type) ? 1 : 0;
 100         }
 101
 102 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 103         {
 104         int i,j;
 105         BIO *out=NULL,*btmp=NULL;
 106         X509_ALGOR *xa;
 107         const EVP_MD *evp_md;
 108         const EVP_CIPHER *evp_cipher=NULL;
 109         STACK_OF(X509_ALGOR) *md_sk=NULL;
 110         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 111         X509_ALGOR *xalg=NULL;
 112         PKCS7_RECIP_INFO *ri=NULL;
 113         EVP_PKEY *pkey;
 114
 115         i=OBJ_obj2nid(p7->type);
 116         p7->state=PKCS7_S_HEADER;
 117
 118         switch (i)
 119                 {
 120         case NID_pkcs7_signed:
 121                 md_sk=p7->d.sign->md_algs;
 122                 break;
 123         case NID_pkcs7_signedAndEnveloped:
 124                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 125                 md_sk=p7->d.signed_and_enveloped->md_algs;
 126                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 127                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 128                 if (evp_cipher == NULL)
 129                         {
 130                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 131                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 132                         goto err;
 133                         }
 134                 break;
 135         case NID_pkcs7_enveloped:
 136                 rsk=p7->d.enveloped->recipientinfo;
 137                 xalg=p7->d.enveloped->enc_data->algorithm;
 138                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 139                 if (evp_cipher == NULL)
 140                         {
 141                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 142                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 143                         goto err;
 144                         }
 145                 break;
 146         default:
 147                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 148                 goto err;
 149                 }
 150
 151         if (md_sk != NULL)
 152                 {
 153                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 154                         {
 155                         xa=sk_X509_ALGOR_value(md_sk,i);
 156                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 157                                 {
 158                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 159                                 goto err;
 160                                 }
 161
 162                         j=OBJ_obj2nid(xa->algorithm);
 163                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 164                         if (evp_md == NULL)
 165                                 {
 166                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 167                                 goto err;
 168                                 }
 169
 170                         BIO_set_md(btmp,evp_md);
 171                         if (out == NULL)
 172                                 out=btmp;
 173                         else
 174                                 BIO_push(out,btmp);
 175                         btmp=NULL;
 176                         }
 177                 }
 178
 179         if (evp_cipher != NULL)
 180                 {
 181                 unsigned char key[EVP_MAX_KEY_LENGTH];
 182                 unsigned char iv[EVP_MAX_IV_LENGTH];
 183                 int keylen,ivlen;
 184                 int jj,max;
 185                 unsigned char *tmp;
 186                 EVP_CIPHER_CTX *ctx;
 187
 188                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 189                         {
 190                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 191                         goto err;
 192                         }
 193                 BIO_get_cipher_ctx(btmp, &ctx);
 194                 keylen=EVP_CIPHER_key_length(evp_cipher);
 195                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 196                 if (RAND_bytes(key,keylen) <= 0)
 197                         goto err;
 198                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 199                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
 200                 EVP_CipherInit_ex(ctx, evp_cipher, NULL, key, iv, 1);
 201
 202                 if (ivlen > 0) {
 203                         if (xalg->parameter == NULL)
 204                                                 xalg->parameter=ASN1_TYPE_new();
 205                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 206                                                                        goto err;
 207                 }
 208
 209                 /* Lets do the pub key stuff :-) */
 210                 max=0;
 211                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 212                         {
 213                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 214                         if (ri->cert == NULL)
 215                                 {
 216                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 217                                 goto err;
 218                                 }
 219                         pkey=X509_get_pubkey(ri->cert);
 220                         jj=EVP_PKEY_size(pkey);
 221                         EVP_PKEY_free(pkey);
 222                         if (max < jj) max=jj;
 223                         }
 224                 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
 225                         {
 226                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 227                         goto err;
 228                         }
 229                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 230                         {
 231                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 232                         pkey=X509_get_pubkey(ri->cert);
 233                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 234                         EVP_PKEY_free(pkey);
 235                         if (jj <= 0)
 236                                 {
 237                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 238                                 OPENSSL_free(tmp);
 239                                 goto err;
 240                                 }
 241                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 242                         }
 243                 OPENSSL_free(tmp);
 244                 memset(key, 0, keylen);
 245
 246                 if (out == NULL)
 247                         out=btmp;
 248                 else
 249                         BIO_push(out,btmp);
 250                 btmp=NULL;
 251                 }
 252
 253         if (bio == NULL) {
 254                 if (PKCS7_is_detached(p7))
 255                         bio=BIO_new(BIO_s_null());
 256                 else {
 257                         if (PKCS7_type_is_signed(p7) ) {
 258                                 if ( PKCS7_type_is_data(p7->d.sign->contents)) {
 259                                         ASN1_OCTET_STRING *os;
 260                                         os=p7->d.sign->contents->d.data;
 261                                         if (os->length > 0)
 262                                                 bio = BIO_new_mem_buf(os->data, os->length);
 263                                 }
 264                                 else if ( PKCS7_type_is_octet_string(p7->d.sign->contents) ) {
 265                                         ASN1_OCTET_STRING *os;
 266                                         os=p7->d.sign->contents->d.other->value.octet_string;
 267                                         if (os->length > 0)
 268                                                 bio = BIO_new_mem_buf(os->data, os->length);
 269                                 }
 270                         }
 271                         if(bio == NULL) {
 272                                 bio=BIO_new(BIO_s_mem());
 273                                 BIO_set_mem_eof_return(bio,0);
 274                         }
 275                 }
 276         }
 277         BIO_push(out,bio);
 278         bio=NULL;
 279         if (0)
 280                 {
 281 err:
 282                 if (out != NULL)
 283                         BIO_free_all(out);
 284                 if (btmp != NULL)
 285                         BIO_free_all(btmp);
 286                 out=NULL;
 287                 }
 288         return(out);
 289         }
 290
 291 /* int */
 292 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 293         {
 294         int i,j;
 295         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 296         unsigned char *tmp=NULL;
 297         X509_ALGOR *xa;
 298         ASN1_OCTET_STRING *data_body=NULL;
 299         const EVP_MD *evp_md;
 300         const EVP_CIPHER *evp_cipher=NULL;
 301         EVP_CIPHER_CTX *evp_ctx=NULL;
 302         X509_ALGOR *enc_alg=NULL;
 303         STACK_OF(X509_ALGOR) *md_sk=NULL;
 304         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 305         X509_ALGOR *xalg=NULL;
 306         PKCS7_RECIP_INFO *ri=NULL;
 307
 308         i=OBJ_obj2nid(p7->type);
 309         p7->state=PKCS7_S_HEADER;
 310
 311         switch (i)
 312                 {
 313         case NID_pkcs7_signed:
 314                 data_body=p7->d.sign->contents->d.data;
 315                 md_sk=p7->d.sign->md_algs;
 316                 break;
 317         case NID_pkcs7_signedAndEnveloped:
 318                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 319                 md_sk=p7->d.signed_and_enveloped->md_algs;
 320                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 321                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 322                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 323                 if (evp_cipher == NULL)
 324                         {
 325                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 326                         goto err;
 327                         }
 328                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 329                 break;
 330         case NID_pkcs7_enveloped:
 331                 rsk=p7->d.enveloped->recipientinfo;
 332                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 333                 data_body=p7->d.enveloped->enc_data->enc_data;
 334                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 335                 if (evp_cipher == NULL)
 336                         {
 337                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 338                         goto err;
 339                         }
 340                 xalg=p7->d.enveloped->enc_data->algorithm;
 341                 break;
 342         default:
 343                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 344                 goto err;
 345                 }
 346
 347         /* We will be checking the signature */
 348         if (md_sk != NULL)
 349                 {
 350                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 351                         {
 352                         xa=sk_X509_ALGOR_value(md_sk,i);
 353                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 354                                 {
 355                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 356                                 goto err;
 357                                 }
 358
 359                         j=OBJ_obj2nid(xa->algorithm);
 360                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 361                         if (evp_md == NULL)
 362                                 {
 363                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 364                                 goto err;
 365                                 }
 366
 367                         BIO_set_md(btmp,evp_md);
 368                         if (out == NULL)
 369                                 out=btmp;
 370                         else
 371                                 BIO_push(out,btmp);
 372                         btmp=NULL;
 373                         }
 374                 }
 375
 376         if (evp_cipher != NULL)
 377                 {
 378 #if 0
 379                 unsigned char key[EVP_MAX_KEY_LENGTH];
 380                 unsigned char iv[EVP_MAX_IV_LENGTH];
 381                 unsigned char *p;
 382                 int keylen,ivlen;
 383                 int max;
 384                 X509_OBJECT ret;
 385 #endif
 386                 int jj;
 387
 388                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 389                         {
 390                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 391                         goto err;
 392                         }
 393
 394                 /* It was encrypted, we need to decrypt the secret key
 395                  * with the private key */
 396
 397                 /* Find the recipientInfo which matches the passed certificate
 398                  * (if any)
 399                  */
 400
 401                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 402                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 403                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 404                                         pcert->cert_info->issuer) &&
 405                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 406                                         ri->issuer_and_serial->serial)) break;
 407                         ri=NULL;
 408                 }
 409                 if (ri == NULL) {
 410                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 411                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 412                         goto err;
 413                 }
 414
 415                 jj=EVP_PKEY_size(pkey);
 416                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
 417                 if (tmp == NULL)
 418                         {
 419                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 420                         goto err;
 421                         }
 422
 423                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 424                         M_ASN1_STRING_length(ri->enc_key), pkey);
 425                 if (jj <= 0)
 426                         {
 427                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 428                         goto err;
 429                         }
 430
 431                 evp_ctx=NULL;
 432                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 433                 EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0);
 434                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 435                         goto err;
 436
 437                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 438                         /* Some S/MIME clients don't use the same key
 439                          * and effective key length. The key length is
 440                          * determined by the size of the decrypted RSA key.
 441                          */
 442                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 443                                 {
 444                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 445                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 446                                 goto err;
 447                                 }
 448                 }
 449                 EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0);
 450
 451                 memset(tmp,0,jj);
 452
 453                 if (out == NULL)
 454                         out=etmp;
 455                 else
 456                         BIO_push(out,etmp);
 457                 etmp=NULL;
 458                 }
 459
 460 #if 1
 461         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 462                 {
 463                 bio=in_bio;
 464                 }
 465         else
 466                 {
 467 #if 0
 468                 bio=BIO_new(BIO_s_mem());
 469                 /* We need to set this so that when we have read all
 470                  * the data, the encrypt BIO, if present, will read
 471                  * EOF and encode the last few bytes */
 472                 BIO_set_mem_eof_return(bio,0);
 473
 474                 if (data_body->length > 0)
 475                         BIO_write(bio,(char *)data_body->data,data_body->length);
 476 #else
 477                 if (data_body->length > 0)
 478                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 479                 else {
 480                         bio=BIO_new(BIO_s_mem());
 481                         BIO_set_mem_eof_return(bio,0);
 482                 }
 483 #endif
 484                 }
 485         BIO_push(out,bio);
 486         bio=NULL;
 487 #endif
 488         if (0)
 489                 {
 490 err:
 491                 if (out != NULL) BIO_free_all(out);
 492                 if (btmp != NULL) BIO_free_all(btmp);
 493                 if (etmp != NULL) BIO_free_all(etmp);
 494                 if (bio != NULL) BIO_free_all(bio);
 495                 out=NULL;
 496                 }
 497         if (tmp != NULL)
 498                 OPENSSL_free(tmp);
 499         return(out);
 500         }
 501
 502 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 503         {
 504         int ret=0;
 505         int i,j;
 506         BIO *btmp;
 507         BUF_MEM *buf_mem=NULL;
 508         BUF_MEM *buf=NULL;
 509         PKCS7_SIGNER_INFO *si;
 510         EVP_MD_CTX *mdc,ctx_tmp;
 511         STACK_OF(X509_ATTRIBUTE) *sk;
 512         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 513         ASN1_OCTET_STRING *os=NULL;
 514
 515         i=OBJ_obj2nid(p7->type);
 516         p7->state=PKCS7_S_HEADER;
 517
 518         switch (i)
 519                 {
 520         case NID_pkcs7_signedAndEnveloped:
 521                 /* XXXXXXXXXXXXXXXX */
 522                 si_sk=p7->d.signed_and_enveloped->signer_info;
 523                 os=M_ASN1_OCTET_STRING_new();
 524                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 525                 break;
 526         case NID_pkcs7_enveloped:
 527                 /* XXXXXXXXXXXXXXXX */
 528                 os=M_ASN1_OCTET_STRING_new();
 529                 p7->d.enveloped->enc_data->enc_data=os;
 530                 break;
 531         case NID_pkcs7_signed:
 532                 si_sk=p7->d.sign->signer_info;
 533                 os=p7->d.sign->contents->d.data;
 534                 /* If detached data then the content is excluded */
 535                 if(p7->detached) {
 536                         M_ASN1_OCTET_STRING_free(os);
 537                         p7->d.sign->contents->d.data = NULL;
 538                 }
 539                 break;
 540                 }
 541
 542         if (si_sk != NULL)
 543                 {
 544                 if ((buf=BUF_MEM_new()) == NULL)
 545                         {
 546                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 547                         goto err;
 548                         }
 549                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 550                         {
 551                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 552                         if (si->pkey == NULL) continue;
 553
 554                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 555
 556                         btmp=bio;
 557                         for (;;)
 558                                 {
 559                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 560                                         == NULL)
 561                                         {
 562                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 563                                         goto err;
 564                                         }
 565                                 BIO_get_md_ctx(btmp,&mdc);
 566                                 if (mdc == NULL)
 567                                         {
 568                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_INTERNAL_ERROR);
 569                                         goto err;
 570                                         }
 571                                 if (EVP_MD_CTX_type(mdc) == j)
 572                                         break;
 573                                 else
 574                                         btmp=BIO_next(btmp);
 575                                 }
 576
 577                         /* We now have the EVP_MD_CTX, lets do the
 578                          * signing. */
 579                         EVP_MD_CTX_init(&ctx_tmp);
 580                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 581                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 582                                 {
 583                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 584                                 goto err;
 585                                 }
 586
 587                         sk=si->auth_attr;
 588
 589                         /* If there are attributes, we add the digest
 590                          * attribute and only sign the attributes */
 591                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 592                                 {
 593                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
 594                                 unsigned int md_len, alen;
 595                                 ASN1_OCTET_STRING *digest;
 596                                 ASN1_UTCTIME *sign_time;
 597                                 const EVP_MD *md_tmp;
 598
 599                                 /* Add signing time if not already present */
 600                                 if (!PKCS7_get_signed_attribute(si,
 601                                                         NID_pkcs9_signingTime))
 602                                         {
 603                                         sign_time=X509_gmtime_adj(NULL,0);
 604                                         PKCS7_add_signed_attribute(si,
 605                                                 NID_pkcs9_signingTime,
 606                                                 V_ASN1_UTCTIME,sign_time);
 607                                         }
 608
 609                                 /* Add digest */
 610                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 611                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
 612                                 digest=M_ASN1_OCTET_STRING_new();
 613                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 614                                 PKCS7_add_signed_attribute(si,
 615                                         NID_pkcs9_messageDigest,
 616                                         V_ASN1_OCTET_STRING,digest);
 617
 618                                 /* Now sign the attributes */
 619                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
 620                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
 621                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 622                                 if(!abuf) goto err;
 623                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
 624                                 OPENSSL_free(abuf);
 625                                 }
 626
 627 #ifndef OPENSSL_NO_DSA
 628                         if (si->pkey->type == EVP_PKEY_DSA)
 629                                 ctx_tmp.digest=EVP_dss1();
 630 #endif
 631
 632                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 633                                 (unsigned int *)&buf->length,si->pkey))
 634                                 {
 635                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 636                                 goto err;
 637                                 }
 638                         if (!ASN1_STRING_set(si->enc_digest,
 639                                 (unsigned char *)buf->data,buf->length))
 640                                 {
 641                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 642                                 goto err;
 643                                 }
 644                         }
 645                 }
 646
 647         if (!PKCS7_is_detached(p7))
 648                 {
 649                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 650                 if (btmp == NULL)
 651                         {
 652                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 653                         goto err;
 654                         }
 655                 BIO_get_mem_ptr(btmp,&buf_mem);
 656                 /* Mark the BIO read only then we can use its copy of the data
 657                  * instead of making an extra copy.
 658                  */
 659                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 660                 BIO_set_mem_eof_return(btmp, 0);
 661                 os->data = (unsigned char *)buf_mem->data;
 662                 os->length = buf_mem->length;
 663 #if 0
 664                 M_ASN1_OCTET_STRING_set(os,
 665                         (unsigned char *)buf_mem->data,buf_mem->length);
 666 #endif
 667                 }
 668         ret=1;
 669 err:
 670         EVP_MD_CTX_cleanup(&ctx_tmp);
 671         if (buf != NULL) BUF_MEM_free(buf);
 672         return(ret);
 673         }
 674
 675 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 676              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 677         {
 678         PKCS7_ISSUER_AND_SERIAL *ias;
 679         int ret=0,i;
 680         STACK_OF(X509) *cert;
 681         X509 *x509;
 682
 683         if (PKCS7_type_is_signed(p7))
 684                 {
 685                 cert=p7->d.sign->cert;
 686                 }
 687         else if (PKCS7_type_is_signedAndEnveloped(p7))
 688                 {
 689                 cert=p7->d.signed_and_enveloped->cert;
 690                 }
 691         else
 692                 {
 693                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 694                 goto err;
 695                 }
 696         /* XXXXXXXXXXXXXXXXXXXXXXX */
 697         ias=si->issuer_and_serial;
 698
 699         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 700
 701         /* were we able to find the cert in passed to us */
 702         if (x509 == NULL)
 703                 {
 704                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 705                 goto err;
 706                 }
 707
 708         /* Lets verify */
 709         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 710                 {
 711                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 712                 goto err;
 713                 }
 714         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 715         i=X509_verify_cert(ctx);
 716         if (i <= 0)
 717                 {
 718                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 719                 X509_STORE_CTX_cleanup(ctx);
 720                 goto err;
 721                 }
 722         X509_STORE_CTX_cleanup(ctx);
 723
 724         return PKCS7_signatureVerify(bio, p7, si, x509);
 725         err:
 726         return ret;
 727         }
 728
 729 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 730                                                                 X509 *x509)
 731         {
 732         ASN1_OCTET_STRING *os;
 733         EVP_MD_CTX mdc_tmp,*mdc;
 734         int ret=0,i;
 735         int md_type;
 736         STACK_OF(X509_ATTRIBUTE) *sk;
 737         BIO *btmp;
 738         EVP_PKEY *pkey;
 739
 740         EVP_MD_CTX_init(&mdc_tmp);
 741
 742         if (!PKCS7_type_is_signed(p7) &&
 743                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 744                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 745                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 746                 goto err;
 747         }
 748
 749         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 750
 751         btmp=bio;
 752         for (;;)
 753                 {
 754                 if ((btmp == NULL) ||
 755                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 756                         {
 757                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 758                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 759                         goto err;
 760                         }
 761                 BIO_get_md_ctx(btmp,&mdc);
 762                 if (mdc == NULL)
 763                         {
 764                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 765                                                         ERR_R_INTERNAL_ERROR);
 766                         goto err;
 767                         }
 768                 if (EVP_MD_CTX_type(mdc) == md_type)
 769                         break;
 770                 btmp=BIO_next(btmp);
 771                 }
 772
 773         /* mdc is the digest ctx that we want, unless there are attributes,
 774          * in which case the digest is the signed attributes */
 775         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
 776
 777         sk=si->auth_attr;
 778         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 779                 {
 780                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
 781                 unsigned int md_len, alen;
 782                 ASN1_OCTET_STRING *message_digest;
 783
 784                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
 785                 message_digest=PKCS7_digest_from_attributes(sk);
 786                 if (!message_digest)
 787                         {
 788                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 789                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 790                         goto err;
 791                         }
 792                 if ((message_digest->length != (int)md_len) ||
 793                         (memcmp(message_digest->data,md_dat,md_len)))
 794                         {
 795 #if 0
 796 {
 797 int ii;
 798 for (ii=0; ii<message_digest->length; ii++)
 799         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 800 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 801 }
 802 #endif
 803                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 804                                                         PKCS7_R_DIGEST_FAILURE);
 805                         ret= -1;
 806                         goto err;
 807                         }
 808
 809                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
 810
 811                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
 812                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
 813                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
 814
 815                 OPENSSL_free(abuf);
 816                 }
 817
 818         os=si->enc_digest;
 819         pkey = X509_get_pubkey(x509);
 820         if (!pkey)
 821                 {
 822                 ret = -1;
 823                 goto err;
 824                 }
 825 #ifndef OPENSSL_NO_DSA
 826         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 827 #endif
 828
 829         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 830         EVP_PKEY_free(pkey);
 831         if (i <= 0)
 832                 {
 833                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 834                                                 PKCS7_R_SIGNATURE_FAILURE);
 835                 ret= -1;
 836                 goto err;
 837                 }
 838         else
 839                 ret=1;
 840 err:
 841         EVP_MD_CTX_cleanup(&mdc_tmp);
 842         return(ret);
 843         }
 844
 845 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 846         {
 847         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 848         PKCS7_RECIP_INFO *ri;
 849         int i;
 850
 851         i=OBJ_obj2nid(p7->type);
 852         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 853         rsk=p7->d.signed_and_enveloped->recipientinfo;
 854         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 855         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 856         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 857         return(ri->issuer_and_serial);
 858         }
 859
 860 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 861         {
 862         return(get_attribute(si->auth_attr,nid));
 863         }
 864
 865 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 866         {
 867         return(get_attribute(si->unauth_attr,nid));
 868         }
 869
 870 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 871         {
 872         int i;
 873         X509_ATTRIBUTE *xa;
 874         ASN1_OBJECT *o;
 875
 876         o=OBJ_nid2obj(nid);
 877         if (!o || !sk) return(NULL);
 878         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 879                 {
 880                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 881                 if (OBJ_cmp(xa->object,o) == 0)
 882                         {
 883                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
 884                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 885                         else
 886                                 return(NULL);
 887                         }
 888                 }
 889         return(NULL);
 890         }
 891
 892 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 893 {
 894         ASN1_TYPE *astype;
 895         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 896         return astype->value.octet_string;
 897 }
 898
 899 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 900                                 STACK_OF(X509_ATTRIBUTE) *sk)
 901         {
 902         int i;
 903
 904         if (p7si->auth_attr != NULL)
 905                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 906         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 907         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 908                 {
 909                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 910                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 911                     == NULL)
 912                         return(0);
 913                 }
 914         return(1);
 915         }
 916
 917 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 918         {
 919         int i;
 920
 921         if (p7si->unauth_attr != NULL)
 922                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 923                                            X509_ATTRIBUTE_free);
 924         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 925         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 926                 {
 927                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 928                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 929                     == NULL)
 930                         return(0);
 931                 }
 932         return(1);
 933         }
 934
 935 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 936              void *value)
 937         {
 938         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 939         }
 940
 941 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 942              void *value)
 943         {
 944         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 945         }
 946
 947 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 948                          void *value)
 949         {
 950         X509_ATTRIBUTE *attr=NULL;
 951
 952         if (*sk == NULL)
 953                 {
 954                 *sk = sk_X509_ATTRIBUTE_new_null();
 955 new_attrib:
 956                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 957                 sk_X509_ATTRIBUTE_push(*sk,attr);
 958                 }
 959         else
 960                 {
 961                 int i;
 962
 963                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 964                         {
 965                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 966                         if (OBJ_obj2nid(attr->object) == nid)
 967                                 {
 968                                 X509_ATTRIBUTE_free(attr);
 969                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 970                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 971                                 goto end;
 972                                 }
 973                         }
 974                 goto new_attrib;
 975                 }
 976 end:
 977         return(1);
 978         }
 979