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 ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
  95         {
  96         if ( PKCS7_type_is_data(p7))
  97                 return p7->d.data;
  98         if ( PKCS7_type_is_other(p7) && p7->d.other
  99                 && (p7->d.other->type == V_ASN1_OCTET_STRING))
 100                 return p7->d.other->value.octet_string;
 101         return NULL;
 102         }
 103
 104 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
 105         {
 106         BIO *btmp;
 107         const EVP_MD *md;
 108         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 109                 {
 110                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 111                 goto err;
 112                 }
 113
 114         md=EVP_get_digestbyobj(alg->algorithm);
 115         if (md == NULL)
 116                 {
 117                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 118                 goto err;
 119                 }
 120
 121         BIO_set_md(btmp,md);
 122         if (*pbio == NULL)
 123                 *pbio=btmp;
 124         else if (!BIO_push(*pbio,btmp))
 125                 {
 126                 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
 127                 goto err;
 128                 }
 129         btmp=NULL;
 130
 131         return 1;
 132
 133         err:
 134         if (btmp)
 135                 BIO_free(btmp);
 136         return 0;
 137
 138         }
 139
 140 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 141         {
 142         int i;
 143         BIO *out=NULL,*btmp=NULL;
 144         X509_ALGOR *xa = NULL;
 145         const EVP_CIPHER *evp_cipher=NULL;
 146         STACK_OF(X509_ALGOR) *md_sk=NULL;
 147         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 148         X509_ALGOR *xalg=NULL;
 149         PKCS7_RECIP_INFO *ri=NULL;
 150         EVP_PKEY *pkey;
 151         ASN1_OCTET_STRING *os=NULL;
 152
 153         i=OBJ_obj2nid(p7->type);
 154         p7->state=PKCS7_S_HEADER;
 155
 156         switch (i)
 157                 {
 158         case NID_pkcs7_signed:
 159                 md_sk=p7->d.sign->md_algs;
 160                 os = PKCS7_get_octet_string(p7->d.sign->contents);
 161                 break;
 162         case NID_pkcs7_signedAndEnveloped:
 163                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 164                 md_sk=p7->d.signed_and_enveloped->md_algs;
 165                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 166                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
 167                 if (evp_cipher == NULL)
 168                         {
 169                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 170                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 171                         goto err;
 172                         }
 173                 break;
 174         case NID_pkcs7_enveloped:
 175                 rsk=p7->d.enveloped->recipientinfo;
 176                 xalg=p7->d.enveloped->enc_data->algorithm;
 177                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 178                 if (evp_cipher == NULL)
 179                         {
 180                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 181                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 182                         goto err;
 183                         }
 184                 break;
 185         case NID_pkcs7_digest:
 186                 xa = p7->d.digest->md;
 187                 os = PKCS7_get_octet_string(p7->d.digest->contents);
 188                 break;
 189         default:
 190                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 191                 goto err;
 192                 }
 193
 194         for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 195                 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
 196                         goto err;
 197
 198         if (xa && !PKCS7_bio_add_digest(&out, xa))
 199                         goto err;
 200
 201         if (evp_cipher != NULL)
 202                 {
 203                 unsigned char key[EVP_MAX_KEY_LENGTH];
 204                 unsigned char iv[EVP_MAX_IV_LENGTH];
 205                 int keylen,ivlen;
 206                 int jj,max;
 207                 unsigned char *tmp;
 208                 EVP_CIPHER_CTX *ctx;
 209
 210                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 211                         {
 212                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 213                         goto err;
 214                         }
 215                 BIO_get_cipher_ctx(btmp, &ctx);
 216                 keylen=EVP_CIPHER_key_length(evp_cipher);
 217                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 218                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 219                 if (ivlen > 0) RAND_pseudo_bytes(iv,ivlen);
 220                 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
 221                         goto err;
 222                 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
 223                         goto err;
 224                 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
 225                         goto err;
 226
 227                 if (ivlen > 0) {
 228                         if (xalg->parameter == NULL)
 229                                                 xalg->parameter=ASN1_TYPE_new();
 230                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 231                                                                        goto err;
 232                 }
 233
 234                 /* Lets do the pub key stuff :-) */
 235                 max=0;
 236                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 237                         {
 238                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 239                         if (ri->cert == NULL)
 240                                 {
 241                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 242                                 goto err;
 243                                 }
 244                         pkey=X509_get_pubkey(ri->cert);
 245                         jj=EVP_PKEY_size(pkey);
 246                         EVP_PKEY_free(pkey);
 247                         if (max < jj) max=jj;
 248                         }
 249                 if ((tmp=(unsigned char *)OPENSSL_malloc(max)) == NULL)
 250                         {
 251                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 252                         goto err;
 253                         }
 254                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 255                         {
 256                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 257                         pkey=X509_get_pubkey(ri->cert);
 258                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 259                         EVP_PKEY_free(pkey);
 260                         if (jj <= 0)
 261                                 {
 262                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 263                                 OPENSSL_free(tmp);
 264                                 goto err;
 265                                 }
 266                         if (!M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj))
 267                                 {
 268                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 269                                         ERR_R_MALLOC_FAILURE);
 270                                 OPENSSL_free(tmp);
 271                                 goto err;
 272                                 }
 273                         }
 274                 OPENSSL_free(tmp);
 275                 OPENSSL_cleanse(key, keylen);
 276
 277                 if (out == NULL)
 278                         out=btmp;
 279                 else
 280                         BIO_push(out,btmp);
 281                 btmp=NULL;
 282                 }
 283
 284         if (bio == NULL)
 285                 {
 286                 if (PKCS7_is_detached(p7))
 287                         bio=BIO_new(BIO_s_null());
 288                 else if (os && os->length > 0)
 289                         bio = BIO_new_mem_buf(os->data, os->length);
 290                 if(bio == NULL)
 291                         {
 292                         bio=BIO_new(BIO_s_mem());
 293                         BIO_set_mem_eof_return(bio,0);
 294                         }
 295                 }
 296         BIO_push(out,bio);
 297         bio=NULL;
 298         if (0)
 299                 {
 300 err:
 301                 if (out != NULL)
 302                         BIO_free_all(out);
 303                 if (btmp != NULL)
 304                         BIO_free_all(btmp);
 305                 out=NULL;
 306                 }
 307         return(out);
 308         }
 309
 310 /* int */
 311 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 312         {
 313         int i,j;
 314         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 315         unsigned char *tmp=NULL;
 316         X509_ALGOR *xa;
 317         ASN1_OCTET_STRING *data_body=NULL;
 318         const EVP_MD *evp_md;
 319         const EVP_CIPHER *evp_cipher=NULL;
 320         EVP_CIPHER_CTX *evp_ctx=NULL;
 321         X509_ALGOR *enc_alg=NULL;
 322         STACK_OF(X509_ALGOR) *md_sk=NULL;
 323         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 324         X509_ALGOR *xalg=NULL;
 325         PKCS7_RECIP_INFO *ri=NULL;
 326
 327         i=OBJ_obj2nid(p7->type);
 328         p7->state=PKCS7_S_HEADER;
 329
 330         switch (i)
 331                 {
 332         case NID_pkcs7_signed:
 333                 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 334                 md_sk=p7->d.sign->md_algs;
 335                 break;
 336         case NID_pkcs7_signedAndEnveloped:
 337                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 338                 md_sk=p7->d.signed_and_enveloped->md_algs;
 339                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 340                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 341                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 342                 if (evp_cipher == NULL)
 343                         {
 344                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 345                         goto err;
 346                         }
 347                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 348                 break;
 349         case NID_pkcs7_enveloped:
 350                 rsk=p7->d.enveloped->recipientinfo;
 351                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 352                 data_body=p7->d.enveloped->enc_data->enc_data;
 353                 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
 354                 if (evp_cipher == NULL)
 355                         {
 356                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 357                         goto err;
 358                         }
 359                 xalg=p7->d.enveloped->enc_data->algorithm;
 360                 break;
 361         default:
 362                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 363                 goto err;
 364                 }
 365
 366         /* We will be checking the signature */
 367         if (md_sk != NULL)
 368                 {
 369                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 370                         {
 371                         xa=sk_X509_ALGOR_value(md_sk,i);
 372                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 373                                 {
 374                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 375                                 goto err;
 376                                 }
 377
 378                         j=OBJ_obj2nid(xa->algorithm);
 379                         evp_md=EVP_get_digestbynid(j);
 380                         if (evp_md == NULL)
 381                                 {
 382                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 383                                 goto err;
 384                                 }
 385
 386                         BIO_set_md(btmp,evp_md);
 387                         if (out == NULL)
 388                                 out=btmp;
 389                         else
 390                                 BIO_push(out,btmp);
 391                         btmp=NULL;
 392                         }
 393                 }
 394
 395         if (evp_cipher != NULL)
 396                 {
 397 #if 0
 398                 unsigned char key[EVP_MAX_KEY_LENGTH];
 399                 unsigned char iv[EVP_MAX_IV_LENGTH];
 400                 unsigned char *p;
 401                 int keylen,ivlen;
 402                 int max;
 403                 X509_OBJECT ret;
 404 #endif
 405                 int jj;
 406
 407                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 408                         {
 409                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 410                         goto err;
 411                         }
 412
 413                 /* It was encrypted, we need to decrypt the secret key
 414                  * with the private key */
 415
 416                 /* Find the recipientInfo which matches the passed certificate
 417                  * (if any)
 418                  */
 419
 420                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 421                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 422                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 423                                         pcert->cert_info->issuer) &&
 424                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 425                                         ri->issuer_and_serial->serial)) break;
 426                         ri=NULL;
 427                 }
 428                 if (ri == NULL) {
 429                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 430                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 431                         goto err;
 432                 }
 433
 434                 jj=EVP_PKEY_size(pkey);
 435                 tmp=(unsigned char *)OPENSSL_malloc(jj+10);
 436                 if (tmp == NULL)
 437                         {
 438                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 439                         goto err;
 440                         }
 441
 442                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 443                         M_ASN1_STRING_length(ri->enc_key), pkey);
 444                 if (jj <= 0)
 445                         {
 446                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 447                         goto err;
 448                         }
 449
 450                 evp_ctx=NULL;
 451                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 452                 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
 453                         goto err;
 454                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 455                         goto err;
 456
 457                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 458                         /* Some S/MIME clients don't use the same key
 459                          * and effective key length. The key length is
 460                          * determined by the size of the decrypted RSA key.
 461                          */
 462                         if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, jj))
 463                                 {
 464                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 465                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 466                                 goto err;
 467                                 }
 468                 }
 469                 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,tmp,NULL,0) <= 0)
 470                         goto err;
 471
 472                 OPENSSL_cleanse(tmp,jj);
 473
 474                 if (out == NULL)
 475                         out=etmp;
 476                 else
 477                         BIO_push(out,etmp);
 478                 etmp=NULL;
 479                 }
 480
 481 #if 1
 482         if (PKCS7_is_detached(p7) || (in_bio != NULL))
 483                 {
 484                 bio=in_bio;
 485                 }
 486         else
 487                 {
 488 #if 0
 489                 bio=BIO_new(BIO_s_mem());
 490                 /* We need to set this so that when we have read all
 491                  * the data, the encrypt BIO, if present, will read
 492                  * EOF and encode the last few bytes */
 493                 BIO_set_mem_eof_return(bio,0);
 494
 495                 if (data_body->length > 0)
 496                         BIO_write(bio,(char *)data_body->data,data_body->length);
 497 #else
 498                 if (data_body->length > 0)
 499                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 500                 else {
 501                         bio=BIO_new(BIO_s_mem());
 502                         BIO_set_mem_eof_return(bio,0);
 503                 }
 504 #endif
 505                 }
 506         BIO_push(out,bio);
 507         bio=NULL;
 508 #endif
 509         if (0)
 510                 {
 511 err:
 512                 if (out != NULL) BIO_free_all(out);
 513                 if (btmp != NULL) BIO_free_all(btmp);
 514                 if (etmp != NULL) BIO_free_all(etmp);
 515                 if (bio != NULL) BIO_free_all(bio);
 516                 out=NULL;
 517                 }
 518         if (tmp != NULL)
 519                 OPENSSL_free(tmp);
 520         return(out);
 521         }
 522
 523 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
 524         {
 525         for (;;)
 526                 {
 527                 bio=BIO_find_type(bio,BIO_TYPE_MD);
 528                 if (bio == NULL)
 529                         {
 530                         PKCS7err(PKCS7_F_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 531                         return NULL;
 532                         }
 533                 BIO_get_md_ctx(bio,pmd);
 534                 if (*pmd == NULL)
 535                         {
 536                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_INTERNAL_ERROR);
 537                         return NULL;
 538                         }
 539                 if (EVP_MD_CTX_type(*pmd) == nid)
 540                         return bio;
 541                 bio=BIO_next(bio);
 542                 }
 543         return NULL;
 544         }
 545
 546 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 547         {
 548         int ret=0;
 549         int i,j;
 550         BIO *btmp;
 551         BUF_MEM *buf_mem=NULL;
 552         BUF_MEM *buf=NULL;
 553         PKCS7_SIGNER_INFO *si;
 554         EVP_MD_CTX *mdc,ctx_tmp;
 555         STACK_OF(X509_ATTRIBUTE) *sk;
 556         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 557         ASN1_OCTET_STRING *os=NULL;
 558
 559         EVP_MD_CTX_init(&ctx_tmp);
 560         i=OBJ_obj2nid(p7->type);
 561         p7->state=PKCS7_S_HEADER;
 562
 563         switch (i)
 564                 {
 565         case NID_pkcs7_signedAndEnveloped:
 566                 /* XXXXXXXXXXXXXXXX */
 567                 si_sk=p7->d.signed_and_enveloped->signer_info;
 568                 if (!(os=M_ASN1_OCTET_STRING_new()))
 569                         {
 570                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_MALLOC_FAILURE);
 571                         goto err;
 572                         }
 573                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 574                 break;
 575         case NID_pkcs7_enveloped:
 576                 /* XXXXXXXXXXXXXXXX */
 577                 if (!(os=M_ASN1_OCTET_STRING_new()))
 578                         {
 579                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_MALLOC_FAILURE);
 580                         goto err;
 581                         }
 582                 p7->d.enveloped->enc_data->enc_data=os;
 583                 break;
 584         case NID_pkcs7_signed:
 585                 si_sk=p7->d.sign->signer_info;
 586                 os=PKCS7_get_octet_string(p7->d.sign->contents);
 587                 /* If detached data then the content is excluded */
 588                 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 589                         M_ASN1_OCTET_STRING_free(os);
 590                         p7->d.sign->contents->d.data = NULL;
 591                 }
 592                 break;
 593
 594         case NID_pkcs7_digest:
 595                 os=PKCS7_get_octet_string(p7->d.digest->contents);
 596                 /* If detached data then the content is excluded */
 597                 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 598                         {
 599                         M_ASN1_OCTET_STRING_free(os);
 600                         p7->d.digest->contents->d.data = NULL;
 601                         }
 602                 break;
 603
 604                 }
 605
 606         if (si_sk != NULL)
 607                 {
 608                 if ((buf=BUF_MEM_new()) == NULL)
 609                         {
 610                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 611                         goto err;
 612                         }
 613                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 614                         {
 615                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 616                         if (si->pkey == NULL) continue;
 617
 618                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 619
 620                         btmp=bio;
 621
 622                         btmp = PKCS7_find_digest(&mdc, btmp, j);
 623
 624                         if (btmp == NULL)
 625                                 goto err;
 626
 627                         /* We now have the EVP_MD_CTX, lets do the
 628                          * signing. */
 629                         EVP_MD_CTX_copy_ex(&ctx_tmp,mdc);
 630                         if (!BUF_MEM_grow_clean(buf,EVP_PKEY_size(si->pkey)))
 631                                 {
 632                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 633                                 goto err;
 634                                 }
 635
 636                         sk=si->auth_attr;
 637
 638                         /* If there are attributes, we add the digest
 639                          * attribute and only sign the attributes */
 640                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 641                                 {
 642                                 unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL;
 643                                 unsigned int md_len, alen;
 644                                 ASN1_OCTET_STRING *digest;
 645                                 ASN1_UTCTIME *sign_time;
 646                                 const EVP_MD *md_tmp;
 647
 648                                 /* Add signing time if not already present */
 649                                 if (!PKCS7_get_signed_attribute(si,
 650                                                         NID_pkcs9_signingTime))
 651                                         {
 652                                         if (!(sign_time=X509_gmtime_adj(NULL,0)))
 653                                                 {
 654                                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,
 655                                                         ERR_R_MALLOC_FAILURE);
 656                                                 goto err;
 657                                                 }
 658                                         PKCS7_add_signed_attribute(si,
 659                                                 NID_pkcs9_signingTime,
 660                                                 V_ASN1_UTCTIME,sign_time);
 661                                         }
 662
 663                                 /* Add digest */
 664                                 md_tmp=EVP_MD_CTX_md(&ctx_tmp);
 665                                 EVP_DigestFinal_ex(&ctx_tmp,md_data,&md_len);
 666                                 if (!(digest=M_ASN1_OCTET_STRING_new()))
 667                                         {
 668                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,
 669                                                 ERR_R_MALLOC_FAILURE);
 670                                         goto err;
 671                                         }
 672                                 if (!M_ASN1_OCTET_STRING_set(digest,md_data,
 673                                                                 md_len))
 674                                         {
 675                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,
 676                                                 ERR_R_MALLOC_FAILURE);
 677                                         goto err;
 678                                         }
 679                                 PKCS7_add_signed_attribute(si,
 680                                         NID_pkcs9_messageDigest,
 681                                         V_ASN1_OCTET_STRING,digest);
 682
 683                                 /* Now sign the attributes */
 684                                 EVP_SignInit_ex(&ctx_tmp,md_tmp,NULL);
 685                                 alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf,
 686                                                         ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
 687                                 if(!abuf) goto err;
 688                                 EVP_SignUpdate(&ctx_tmp,abuf,alen);
 689                                 OPENSSL_free(abuf);
 690                                 }
 691
 692 #ifndef OPENSSL_NO_DSA
 693                         if (si->pkey->type == EVP_PKEY_DSA)
 694                                 ctx_tmp.digest=EVP_dss1();
 695 #endif
 696 #ifndef OPENSSL_NO_ECDSA
 697                         if (si->pkey->type == EVP_PKEY_EC)
 698                                 ctx_tmp.digest=EVP_ecdsa();
 699 #endif
 700
 701                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 702                                 (unsigned int *)&buf->length,si->pkey))
 703                                 {
 704                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 705                                 goto err;
 706                                 }
 707                         if (!ASN1_STRING_set(si->enc_digest,
 708                                 (unsigned char *)buf->data,buf->length))
 709                                 {
 710                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 711                                 goto err;
 712                                 }
 713                         }
 714                 }
 715         else if (i == NID_pkcs7_digest)
 716                 {
 717                 unsigned char md_data[EVP_MAX_MD_SIZE];
 718                 unsigned int md_len;
 719                 if (!PKCS7_find_digest(&mdc, bio,
 720                                 OBJ_obj2nid(p7->d.digest->md->algorithm)))
 721                         goto err;
 722                 EVP_DigestFinal_ex(mdc,md_data,&md_len);
 723                 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 724                 }
 725
 726         if (!PKCS7_is_detached(p7))
 727                 {
 728                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 729                 if (btmp == NULL)
 730                         {
 731                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 732                         goto err;
 733                         }
 734                 BIO_get_mem_ptr(btmp,&buf_mem);
 735                 /* Mark the BIO read only then we can use its copy of the data
 736                  * instead of making an extra copy.
 737                  */
 738                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 739                 BIO_set_mem_eof_return(btmp, 0);
 740                 os->data = (unsigned char *)buf_mem->data;
 741                 os->length = buf_mem->length;
 742 #if 0
 743                 M_ASN1_OCTET_STRING_set(os,
 744                         (unsigned char *)buf_mem->data,buf_mem->length);
 745 #endif
 746                 }
 747         ret=1;
 748 err:
 749         EVP_MD_CTX_cleanup(&ctx_tmp);
 750         if (buf != NULL) BUF_MEM_free(buf);
 751         return(ret);
 752         }
 753
 754 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 755              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 756         {
 757         PKCS7_ISSUER_AND_SERIAL *ias;
 758         int ret=0,i;
 759         STACK_OF(X509) *cert;
 760         X509 *x509;
 761
 762         if (PKCS7_type_is_signed(p7))
 763                 {
 764                 cert=p7->d.sign->cert;
 765                 }
 766         else if (PKCS7_type_is_signedAndEnveloped(p7))
 767                 {
 768                 cert=p7->d.signed_and_enveloped->cert;
 769                 }
 770         else
 771                 {
 772                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 773                 goto err;
 774                 }
 775         /* XXXXXXXXXXXXXXXXXXXXXXX */
 776         ias=si->issuer_and_serial;
 777
 778         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 779
 780         /* were we able to find the cert in passed to us */
 781         if (x509 == NULL)
 782                 {
 783                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 784                 goto err;
 785                 }
 786
 787         /* Lets verify */
 788         if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
 789                 {
 790                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 791                 goto err;
 792                 }
 793         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 794         i=X509_verify_cert(ctx);
 795         if (i <= 0)
 796                 {
 797                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 798                 X509_STORE_CTX_cleanup(ctx);
 799                 goto err;
 800                 }
 801         X509_STORE_CTX_cleanup(ctx);
 802
 803         return PKCS7_signatureVerify(bio, p7, si, x509);
 804         err:
 805         return ret;
 806         }
 807
 808 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 809                                                                 X509 *x509)
 810         {
 811         ASN1_OCTET_STRING *os;
 812         EVP_MD_CTX mdc_tmp,*mdc;
 813         int ret=0,i;
 814         int md_type;
 815         STACK_OF(X509_ATTRIBUTE) *sk;
 816         BIO *btmp;
 817         EVP_PKEY *pkey;
 818
 819         EVP_MD_CTX_init(&mdc_tmp);
 820
 821         if (!PKCS7_type_is_signed(p7) &&
 822                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 823                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 824                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 825                 goto err;
 826         }
 827
 828         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 829
 830         btmp=bio;
 831         for (;;)
 832                 {
 833                 if ((btmp == NULL) ||
 834                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 835                         {
 836                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 837                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 838                         goto err;
 839                         }
 840                 BIO_get_md_ctx(btmp,&mdc);
 841                 if (mdc == NULL)
 842                         {
 843                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 844                                                         ERR_R_INTERNAL_ERROR);
 845                         goto err;
 846                         }
 847                 if (EVP_MD_CTX_type(mdc) == md_type)
 848                         break;
 849                 /* Workaround for some broken clients that put the signature
 850                  * OID instead of the digest OID in digest_alg->algorithm
 851                  */
 852                 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
 853                         break;
 854                 btmp=BIO_next(btmp);
 855                 }
 856
 857         /* mdc is the digest ctx that we want, unless there are attributes,
 858          * in which case the digest is the signed attributes */
 859         EVP_MD_CTX_copy_ex(&mdc_tmp,mdc);
 860
 861         sk=si->auth_attr;
 862         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 863                 {
 864                 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
 865                 unsigned int md_len, alen;
 866                 ASN1_OCTET_STRING *message_digest;
 867
 868                 EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len);
 869                 message_digest=PKCS7_digest_from_attributes(sk);
 870                 if (!message_digest)
 871                         {
 872                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 873                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 874                         goto err;
 875                         }
 876                 if ((message_digest->length != (int)md_len) ||
 877                         (memcmp(message_digest->data,md_dat,md_len)))
 878                         {
 879 #if 0
 880 {
 881 int ii;
 882 for (ii=0; ii<message_digest->length; ii++)
 883         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 884 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 885 }
 886 #endif
 887                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 888                                                         PKCS7_R_DIGEST_FAILURE);
 889                         ret= -1;
 890                         goto err;
 891                         }
 892
 893                 EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL);
 894
 895                 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
 896                                                 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
 897                 EVP_VerifyUpdate(&mdc_tmp, abuf, alen);
 898
 899                 OPENSSL_free(abuf);
 900                 }
 901
 902         os=si->enc_digest;
 903         pkey = X509_get_pubkey(x509);
 904         if (!pkey)
 905                 {
 906                 ret = -1;
 907                 goto err;
 908                 }
 909 #ifndef OPENSSL_NO_DSA
 910         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 911 #endif
 912 #ifndef OPENSSL_NO_ECDSA
 913         if (pkey->type == EVP_PKEY_EC) mdc_tmp.digest=EVP_ecdsa();
 914 #endif
 915
 916         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 917         EVP_PKEY_free(pkey);
 918         if (i <= 0)
 919                 {
 920                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 921                                                 PKCS7_R_SIGNATURE_FAILURE);
 922                 ret= -1;
 923                 goto err;
 924                 }
 925         else
 926                 ret=1;
 927 err:
 928         EVP_MD_CTX_cleanup(&mdc_tmp);
 929         return(ret);
 930         }
 931
 932 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 933         {
 934         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 935         PKCS7_RECIP_INFO *ri;
 936         int i;
 937
 938         i=OBJ_obj2nid(p7->type);
 939         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 940         rsk=p7->d.signed_and_enveloped->recipientinfo;
 941         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 942         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 943         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 944         return(ri->issuer_and_serial);
 945         }
 946
 947 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 948         {
 949         return(get_attribute(si->auth_attr,nid));
 950         }
 951
 952 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 953         {
 954         return(get_attribute(si->unauth_attr,nid));
 955         }
 956
 957 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 958         {
 959         int i;
 960         X509_ATTRIBUTE *xa;
 961         ASN1_OBJECT *o;
 962
 963         o=OBJ_nid2obj(nid);
 964         if (!o || !sk) return(NULL);
 965         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 966                 {
 967                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 968                 if (OBJ_cmp(xa->object,o) == 0)
 969                         {
 970                         if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
 971                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 972                         else
 973                                 return(NULL);
 974                         }
 975                 }
 976         return(NULL);
 977         }
 978
 979 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 980 {
 981         ASN1_TYPE *astype;
 982         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 983         return astype->value.octet_string;
 984 }
 985
 986 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 987                                 STACK_OF(X509_ATTRIBUTE) *sk)
 988         {
 989         int i;
 990
 991         if (p7si->auth_attr != NULL)
 992                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 993         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 994         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 995                 {
 996                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 997                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 998                     == NULL)
 999                         return(0);
1000                 }
1001         return(1);
1002         }
1003
1004 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1005         {
1006         int i;
1007
1008         if (p7si->unauth_attr != NULL)
1009                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1010                                            X509_ATTRIBUTE_free);
1011         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1012         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1013                 {
1014                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1015                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1016                     == NULL)
1017                         return(0);
1018                 }
1019         return(1);
1020         }
1021
1022 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1023              void *value)
1024         {
1025         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1026         }
1027
1028 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1029              void *value)
1030         {
1031         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1032         }
1033
1034 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1035                          void *value)
1036         {
1037         X509_ATTRIBUTE *attr=NULL;
1038
1039         if (*sk == NULL)
1040                 {
1041                 *sk = sk_X509_ATTRIBUTE_new_null();
1042 new_attrib:
1043                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1044                 sk_X509_ATTRIBUTE_push(*sk,attr);
1045                 }
1046         else
1047                 {
1048                 int i;
1049
1050                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1051                         {
1052                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
1053                         if (OBJ_obj2nid(attr->object) == nid)
1054                                 {
1055                                 X509_ATTRIBUTE_free(attr);
1056                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1057                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
1058                                 goto end;
1059                                 }
1060                         }
1061                 goto new_attrib;
1062                 }
1063 end:
1064         return(1);
1065         }
1066