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_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
  66                          void *value);
  67 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
  68
  69 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
  70         {
  71         int i,j;
  72         BIO *out=NULL,*btmp=NULL;
  73         X509_ALGOR *xa;
  74         const EVP_MD *evp_md;
  75         const EVP_CIPHER *evp_cipher=NULL;
  76         STACK_OF(X509_ALGOR) *md_sk=NULL;
  77         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
  78         X509_ALGOR *xalg=NULL;
  79         PKCS7_RECIP_INFO *ri=NULL;
  80         EVP_PKEY *pkey;
  81
  82         i=OBJ_obj2nid(p7->type);
  83         p7->state=PKCS7_S_HEADER;
  84
  85         switch (i)
  86                 {
  87         case NID_pkcs7_signed:
  88                 md_sk=p7->d.sign->md_algs;
  89                 break;
  90         case NID_pkcs7_signedAndEnveloped:
  91                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  92                 md_sk=p7->d.signed_and_enveloped->md_algs;
  93                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  94                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
  95                 if (evp_cipher == NULL)
  96                         {
  97                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
  98                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
  99                         goto err;
 100                         }
 101                 break;
 102         case NID_pkcs7_enveloped:
 103                 rsk=p7->d.enveloped->recipientinfo;
 104                 xalg=p7->d.enveloped->enc_data->algorithm;
 105                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 106                 if (evp_cipher == NULL)
 107                         {
 108                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 109                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 110                         goto err;
 111                         }
 112                 break;
 113         default:
 114                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 115                 goto err;
 116                 }
 117
 118         if (md_sk != NULL)
 119                 {
 120                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 121                         {
 122                         xa=sk_X509_ALGOR_value(md_sk,i);
 123                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 124                                 {
 125                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 126                                 goto err;
 127                                 }
 128
 129                         j=OBJ_obj2nid(xa->algorithm);
 130                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 131                         if (evp_md == NULL)
 132                                 {
 133                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 134                                 goto err;
 135                                 }
 136
 137                         BIO_set_md(btmp,evp_md);
 138                         if (out == NULL)
 139                                 out=btmp;
 140                         else
 141                                 BIO_push(out,btmp);
 142                         btmp=NULL;
 143                         }
 144                 }
 145
 146         if (evp_cipher != NULL)
 147                 {
 148                 unsigned char key[EVP_MAX_KEY_LENGTH];
 149                 unsigned char iv[EVP_MAX_IV_LENGTH];
 150                 int keylen,ivlen;
 151                 int jj,max;
 152                 unsigned char *tmp;
 153                 EVP_CIPHER_CTX *ctx;
 154
 155                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 156                         {
 157                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 158                         goto err;
 159                         }
 160                 BIO_get_cipher_ctx(btmp, &ctx);
 161                 keylen=EVP_CIPHER_key_length(evp_cipher);
 162                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 163                 RAND_bytes(key,keylen);
 164                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 165                 if (ivlen > 0) RAND_bytes(iv,ivlen);
 166                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
 167
 168                 if (ivlen > 0) {
 169                         if (xalg->parameter == NULL)
 170                                                 xalg->parameter=ASN1_TYPE_new();
 171                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 172                                                                        goto err;
 173                 }
 174
 175                 /* Lets do the pub key stuff :-) */
 176                 max=0;
 177                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 178                         {
 179                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 180                         if (ri->cert == NULL)
 181                                 {
 182                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 183                                 goto err;
 184                                 }
 185                         pkey=X509_get_pubkey(ri->cert);
 186                         jj=EVP_PKEY_size(pkey);
 187                         EVP_PKEY_free(pkey);
 188                         if (max < jj) max=jj;
 189                         }
 190                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 191                         {
 192                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 193                         goto err;
 194                         }
 195                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 196                         {
 197                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 198                         pkey=X509_get_pubkey(ri->cert);
 199                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 200                         EVP_PKEY_free(pkey);
 201                         if (jj <= 0)
 202                                 {
 203                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 204                                 Free(tmp);
 205                                 goto err;
 206                                 }
 207                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 208                         }
 209                 Free(tmp);
 210                 memset(key, 0, keylen);
 211
 212                 if (out == NULL)
 213                         out=btmp;
 214                 else
 215                         BIO_push(out,btmp);
 216                 btmp=NULL;
 217                 }
 218
 219         if (bio == NULL) {
 220                 if (p7->detached)
 221                         bio=BIO_new(BIO_s_null());
 222                 else {
 223                         if (PKCS7_type_is_signed(p7) &&
 224                                 PKCS7_type_is_data(p7->d.sign->contents)) {
 225                                 ASN1_OCTET_STRING *os;
 226                                 os=p7->d.sign->contents->d.data;
 227                                 if (os->length > 0) bio =
 228                                         BIO_new_mem_buf(os->data, os->length);
 229                         } else {
 230                                 bio=BIO_new(BIO_s_mem());
 231                                 BIO_set_mem_eof_return(bio,0);
 232                         }
 233                 }
 234         }
 235         BIO_push(out,bio);
 236         bio=NULL;
 237         if (0)
 238                 {
 239 err:
 240                 if (out != NULL)
 241                         BIO_free_all(out);
 242                 if (btmp != NULL)
 243                         BIO_free_all(btmp);
 244                 out=NULL;
 245                 }
 246         return(out);
 247         }
 248
 249 /* int */
 250 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 251         {
 252         int i,j;
 253         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 254         unsigned char *tmp=NULL;
 255         X509_ALGOR *xa;
 256         ASN1_OCTET_STRING *data_body=NULL;
 257         const EVP_MD *evp_md;
 258         const EVP_CIPHER *evp_cipher=NULL;
 259         EVP_CIPHER_CTX *evp_ctx=NULL;
 260         X509_ALGOR *enc_alg=NULL;
 261         STACK_OF(X509_ALGOR) *md_sk=NULL;
 262         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 263         X509_ALGOR *xalg=NULL;
 264         PKCS7_RECIP_INFO *ri=NULL;
 265         char is_rc2 = 0;
 266 /*      EVP_PKEY *pkey; */
 267 #if 0
 268         X509_STORE_CTX s_ctx;
 269 #endif
 270
 271         i=OBJ_obj2nid(p7->type);
 272         p7->state=PKCS7_S_HEADER;
 273
 274         switch (i)
 275                 {
 276         case NID_pkcs7_signed:
 277                 data_body=p7->d.sign->contents->d.data;
 278                 md_sk=p7->d.sign->md_algs;
 279                 break;
 280         case NID_pkcs7_signedAndEnveloped:
 281                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 282                 md_sk=p7->d.signed_and_enveloped->md_algs;
 283                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 284                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 285                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 286                 if (evp_cipher == NULL)
 287                         {
 288                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 289                         goto err;
 290                         }
 291                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 292                 break;
 293         case NID_pkcs7_enveloped:
 294                 rsk=p7->d.enveloped->recipientinfo;
 295                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 296                 data_body=p7->d.enveloped->enc_data->enc_data;
 297                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 298                 if (evp_cipher == NULL)
 299                         {
 300                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 301                         goto err;
 302                         }
 303                 xalg=p7->d.enveloped->enc_data->algorithm;
 304                 break;
 305         default:
 306                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 307                 goto err;
 308                 }
 309
 310         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc) is_rc2 = 1;
 311
 312         /* We will be checking the signature */
 313         if (md_sk != NULL)
 314                 {
 315                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 316                         {
 317                         xa=sk_X509_ALGOR_value(md_sk,i);
 318                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 319                                 {
 320                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 321                                 goto err;
 322                                 }
 323
 324                         j=OBJ_obj2nid(xa->algorithm);
 325                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 326                         if (evp_md == NULL)
 327                                 {
 328                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 329                                 goto err;
 330                                 }
 331
 332                         BIO_set_md(btmp,evp_md);
 333                         if (out == NULL)
 334                                 out=btmp;
 335                         else
 336                                 BIO_push(out,btmp);
 337                         btmp=NULL;
 338                         }
 339                 }
 340
 341         if (evp_cipher != NULL)
 342                 {
 343 #if 0
 344                 unsigned char key[EVP_MAX_KEY_LENGTH];
 345                 unsigned char iv[EVP_MAX_IV_LENGTH];
 346                 unsigned char *p;
 347                 int keylen,ivlen;
 348                 int max;
 349                 X509_OBJECT ret;
 350 #endif
 351                 int jj;
 352
 353                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 354                         {
 355                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 356                         goto err;
 357                         }
 358
 359                 /* It was encrypted, we need to decrypt the secret key
 360                  * with the private key */
 361
 362                 /* Find the recipientInfo which matches the passed certificate
 363                  * (if any)
 364                  */
 365
 366                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 367                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 368                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 369                                         pcert->cert_info->issuer) &&
 370                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 371                                         ri->issuer_and_serial->serial)) break;
 372                         ri=NULL;
 373                 }
 374                 if (ri == NULL) {
 375                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 376                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 377                         return(NULL);
 378                 }
 379
 380                 jj=EVP_PKEY_size(pkey);
 381                 tmp=(unsigned char *)Malloc(jj+10);
 382                 if (tmp == NULL)
 383                         {
 384                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 385                         goto err;
 386                         }
 387
 388                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 389                         M_ASN1_STRING_length(ri->enc_key), pkey);
 390                 if (jj <= 0)
 391                         {
 392                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 393                         goto err;
 394                         }
 395
 396                 evp_ctx=NULL;
 397                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 398                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 399                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 400                         return(NULL);
 401
 402                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 403                         /* HACK: some S/MIME clients don't use the same key
 404                          * and effective key length. The key length is
 405                          * determined by the size of the decrypted RSA key.
 406                          * So we hack things to manually set the RC2 key
 407                          * because we currently can't do this with the EVP
 408                          * interface.
 409                          */
 410                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
 411                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
 412                         else {
 413
 414                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 415                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 416                                 goto err;
 417                         }
 418                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
 419
 420                 memset(tmp,0,jj);
 421
 422                 if (out == NULL)
 423                         out=etmp;
 424                 else
 425                         BIO_push(out,etmp);
 426                 etmp=NULL;
 427                 }
 428
 429 #if 1
 430         if (p7->detached || (in_bio != NULL))
 431                 {
 432                 bio=in_bio;
 433                 }
 434         else
 435                 {
 436 #if 0
 437                 bio=BIO_new(BIO_s_mem());
 438                 /* We need to set this so that when we have read all
 439                  * the data, the encrypt BIO, if present, will read
 440                  * EOF and encode the last few bytes */
 441                 BIO_set_mem_eof_return(bio,0);
 442
 443                 if (data_body->length > 0)
 444                         BIO_write(bio,(char *)data_body->data,data_body->length);
 445 #else
 446                 if (data_body->length > 0)
 447                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 448                 else {
 449                         bio=BIO_new(BIO_s_mem());
 450                         BIO_set_mem_eof_return(bio,0);
 451                 }
 452 #endif
 453                 }
 454         BIO_push(out,bio);
 455         bio=NULL;
 456 #endif
 457         if (0)
 458                 {
 459 err:
 460                 if (out != NULL) BIO_free_all(out);
 461                 if (btmp != NULL) BIO_free_all(btmp);
 462                 if (etmp != NULL) BIO_free_all(etmp);
 463                 if (bio != NULL) BIO_free_all(bio);
 464                 out=NULL;
 465                 }
 466         if (tmp != NULL)
 467                 Free(tmp);
 468         return(out);
 469         }
 470
 471 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 472         {
 473         int ret=0;
 474         int i,j;
 475         BIO *btmp;
 476         BUF_MEM *buf_mem=NULL;
 477         BUF_MEM *buf=NULL;
 478         PKCS7_SIGNER_INFO *si;
 479         EVP_MD_CTX *mdc,ctx_tmp;
 480         STACK_OF(X509_ATTRIBUTE) *sk;
 481         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 482         unsigned char *p,*pp=NULL;
 483         int x;
 484         ASN1_OCTET_STRING *os=NULL;
 485
 486         i=OBJ_obj2nid(p7->type);
 487         p7->state=PKCS7_S_HEADER;
 488
 489         switch (i)
 490                 {
 491         case NID_pkcs7_signedAndEnveloped:
 492                 /* XXXXXXXXXXXXXXXX */
 493                 si_sk=p7->d.signed_and_enveloped->signer_info;
 494                 os=M_ASN1_OCTET_STRING_new();
 495                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 496                 break;
 497         case NID_pkcs7_enveloped:
 498                 /* XXXXXXXXXXXXXXXX */
 499                 os=M_ASN1_OCTET_STRING_new();
 500                 p7->d.enveloped->enc_data->enc_data=os;
 501                 break;
 502         case NID_pkcs7_signed:
 503                 si_sk=p7->d.sign->signer_info;
 504                 os=p7->d.sign->contents->d.data;
 505                 /* If detached data then the content is excluded */
 506                 if(p7->detached) {
 507                         M_ASN1_OCTET_STRING_free(os);
 508                         p7->d.sign->contents->d.data = NULL;
 509                 }
 510                 break;
 511                 }
 512
 513         if (si_sk != NULL)
 514                 {
 515                 if ((buf=BUF_MEM_new()) == NULL)
 516                         {
 517                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 518                         goto err;
 519                         }
 520                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 521                         {
 522                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 523                         if (si->pkey == NULL) continue;
 524
 525                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 526
 527                         btmp=bio;
 528                         for (;;)
 529                                 {
 530                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 531                                         == NULL)
 532                                         {
 533                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 534                                         goto err;
 535                                         }
 536                                 BIO_get_md_ctx(btmp,&mdc);
 537                                 if (mdc == NULL)
 538                                         {
 539                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 540                                         goto err;
 541                                         }
 542                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 543                                         break;
 544                                 else
 545                                         btmp=btmp->next_bio;
 546                                 }
 547
 548                         /* We now have the EVP_MD_CTX, lets do the
 549                          * signing. */
 550                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 551                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 552                                 {
 553                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 554                                 goto err;
 555                                 }
 556
 557                         sk=si->auth_attr;
 558
 559                         /* If there are attributes, we add the digest
 560                          * attribute and only sign the attributes */
 561                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 562                                 {
 563                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 564                                 unsigned int md_len;
 565                                 ASN1_OCTET_STRING *digest;
 566                                 ASN1_UTCTIME *sign_time;
 567                                 const EVP_MD *md_tmp;
 568
 569                                 /* Add signing time */
 570                                 sign_time=X509_gmtime_adj(NULL,0);
 571                                 PKCS7_add_signed_attribute(si,
 572                                         NID_pkcs9_signingTime,
 573                                         V_ASN1_UTCTIME,sign_time);
 574
 575                                 /* Add digest */
 576                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 577                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 578                                 digest=M_ASN1_OCTET_STRING_new();
 579                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 580                                 PKCS7_add_signed_attribute(si,
 581                                         NID_pkcs9_messageDigest,
 582                                         V_ASN1_OCTET_STRING,digest);
 583
 584                                 /* Now sign the mess */
 585                                 EVP_SignInit(&ctx_tmp,md_tmp);
 586                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
 587                                            i2d_X509_ATTRIBUTE,
 588                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 589                                 pp=(unsigned char *)Malloc(x);
 590                                 p=pp;
 591                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
 592                                            i2d_X509_ATTRIBUTE,
 593                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 594                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 595                                 Free(pp);
 596                                 pp=NULL;
 597                                 }
 598
 599                         if (si->pkey->type == EVP_PKEY_DSA)
 600                                 ctx_tmp.digest=EVP_dss1();
 601
 602                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 603                                 (unsigned int *)&buf->length,si->pkey))
 604                                 {
 605                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 606                                 goto err;
 607                                 }
 608                         if (!ASN1_STRING_set(si->enc_digest,
 609                                 (unsigned char *)buf->data,buf->length))
 610                                 {
 611                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 612                                 goto err;
 613                                 }
 614                         }
 615                 }
 616
 617         if (!p7->detached)
 618                 {
 619                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 620                 if (btmp == NULL)
 621                         {
 622                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 623                         goto err;
 624                         }
 625                 BIO_get_mem_ptr(btmp,&buf_mem);
 626                 /* Mark the BIO read only then we can use its copy of the data
 627                  * instead of making an extra copy.
 628                  */
 629                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 630                 BIO_set_mem_eof_return(btmp, 0);
 631                 os->data = (unsigned char *)buf_mem->data;
 632                 os->length = buf_mem->length;
 633 #if 0
 634                 M_ASN1_OCTET_STRING_set(os,
 635                         (unsigned char *)buf_mem->data,buf_mem->length);
 636 #endif
 637                 }
 638         if (pp != NULL) Free(pp);
 639         pp=NULL;
 640
 641         ret=1;
 642 err:
 643         if (buf != NULL) BUF_MEM_free(buf);
 644         return(ret);
 645         }
 646
 647 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 648              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 649         {
 650         PKCS7_ISSUER_AND_SERIAL *ias;
 651         int ret=0,i;
 652         STACK_OF(X509) *cert;
 653         X509 *x509;
 654
 655         if (PKCS7_type_is_signed(p7))
 656                 {
 657                 cert=p7->d.sign->cert;
 658                 }
 659         else if (PKCS7_type_is_signedAndEnveloped(p7))
 660                 {
 661                 cert=p7->d.signed_and_enveloped->cert;
 662                 }
 663         else
 664                 {
 665                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 666                 goto err;
 667                 }
 668         /* XXXXXXXXXXXXXXXXXXXXXXX */
 669         ias=si->issuer_and_serial;
 670
 671         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 672
 673         /* were we able to find the cert in passed to us */
 674         if (x509 == NULL)
 675                 {
 676                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 677                 goto err;
 678                 }
 679
 680         /* Lets verify */
 681         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 682         i=X509_verify_cert(ctx);
 683         if (i <= 0)
 684                 {
 685                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 686                 goto err;
 687                 }
 688         X509_STORE_CTX_cleanup(ctx);
 689
 690         return PKCS7_signatureVerify(bio, p7, si, x509);
 691         err:
 692         return ret;
 693         }
 694
 695 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 696                                                                 X509 *x509)
 697         {
 698         ASN1_OCTET_STRING *os;
 699         EVP_MD_CTX mdc_tmp,*mdc;
 700         unsigned char *pp,*p;
 701         int ret=0,i;
 702         int md_type;
 703         STACK_OF(X509_ATTRIBUTE) *sk;
 704         BIO *btmp;
 705         EVP_PKEY *pkey;
 706
 707         if (!PKCS7_type_is_signed(p7) &&
 708                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 709                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 710                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 711                 goto err;
 712         }
 713
 714         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 715
 716         btmp=bio;
 717         for (;;)
 718                 {
 719                 if ((btmp == NULL) ||
 720                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 721                         {
 722                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 723                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 724                         goto err;
 725                         }
 726                 BIO_get_md_ctx(btmp,&mdc);
 727                 if (mdc == NULL)
 728                         {
 729                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 730                                                         PKCS7_R_INTERNAL_ERROR);
 731                         goto err;
 732                         }
 733                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 734                         break;
 735                 btmp=btmp->next_bio;
 736                 }
 737
 738         /* mdc is the digest ctx that we want, unless there are attributes,
 739          * in which case the digest is the signed attributes */
 740         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 741
 742         sk=si->auth_attr;
 743         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 744                 {
 745                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 746                 unsigned int md_len;
 747                 ASN1_OCTET_STRING *message_digest;
 748
 749                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 750                 message_digest=PKCS7_digest_from_attributes(sk);
 751                 if (!message_digest)
 752                         {
 753                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 754                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 755                         goto err;
 756                         }
 757                 if ((message_digest->length != (int)md_len) ||
 758                         (memcmp(message_digest->data,md_dat,md_len)))
 759                         {
 760 #if 0
 761 {
 762 int ii;
 763 for (ii=0; ii<message_digest->length; ii++)
 764         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 765 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 766 }
 767 #endif
 768                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 769                                                         PKCS7_R_DIGEST_FAILURE);
 770                         ret= -1;
 771                         goto err;
 772                         }
 773
 774                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 775                 /* Note: when forming the encoding of the attributes we
 776                  * shouldn't reorder them or this will break the signature.
 777                  * This is done by using the IS_SEQUENCE flag.
 778                  */
 779                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
 780                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 781                 pp=Malloc(i);
 782                 p=pp;
 783                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
 784                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 785                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 786
 787                 Free(pp);
 788                 }
 789
 790         os=si->enc_digest;
 791         pkey = X509_get_pubkey(x509);
 792         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 793
 794         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 795         EVP_PKEY_free(pkey);
 796         if (i <= 0)
 797                 {
 798                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 799                                                 PKCS7_R_SIGNATURE_FAILURE);
 800                 ret= -1;
 801                 goto err;
 802                 }
 803         else
 804                 ret=1;
 805 err:
 806         return(ret);
 807         }
 808
 809 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 810         {
 811         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 812         PKCS7_RECIP_INFO *ri;
 813         int i;
 814
 815         i=OBJ_obj2nid(p7->type);
 816         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 817         rsk=p7->d.signed_and_enveloped->recipientinfo;
 818         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 819         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 820         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 821         return(ri->issuer_and_serial);
 822         }
 823
 824 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 825         {
 826         return(get_attribute(si->auth_attr,nid));
 827         }
 828
 829 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 830         {
 831         return(get_attribute(si->unauth_attr,nid));
 832         }
 833
 834 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 835         {
 836         int i;
 837         X509_ATTRIBUTE *xa;
 838         ASN1_OBJECT *o;
 839
 840         o=OBJ_nid2obj(nid);
 841         if (!o || !sk) return(NULL);
 842         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 843                 {
 844                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 845                 if (OBJ_cmp(xa->object,o) == 0)
 846                         {
 847                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 848                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 849                         else
 850                                 return(NULL);
 851                         }
 852                 }
 853         return(NULL);
 854         }
 855
 856 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 857 {
 858         ASN1_TYPE *astype;
 859         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 860         return astype->value.octet_string;
 861 }
 862
 863 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 864                                 STACK_OF(X509_ATTRIBUTE) *sk)
 865         {
 866         int i;
 867
 868         if (p7si->auth_attr != NULL)
 869                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 870         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 871         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 872                 {
 873                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 874                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 875                     == NULL)
 876                         return(0);
 877                 }
 878         return(1);
 879         }
 880
 881 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 882         {
 883         int i;
 884
 885         if (p7si->unauth_attr != NULL)
 886                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 887                                            X509_ATTRIBUTE_free);
 888         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 889         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 890                 {
 891                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 892                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 893                     == NULL)
 894                         return(0);
 895                 }
 896         return(1);
 897         }
 898
 899 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 900              void *value)
 901         {
 902         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 903         }
 904
 905 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 906              void *value)
 907         {
 908         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 909         }
 910
 911 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 912                          void *value)
 913         {
 914         X509_ATTRIBUTE *attr=NULL;
 915
 916         if (*sk == NULL)
 917                 {
 918                 *sk = sk_X509_ATTRIBUTE_new(NULL);
 919 new_attrib:
 920                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 921                 sk_X509_ATTRIBUTE_push(*sk,attr);
 922                 }
 923         else
 924                 {
 925                 int i;
 926
 927                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 928                         {
 929                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 930                         if (OBJ_obj2nid(attr->object) == nid)
 931                                 {
 932                                 X509_ATTRIBUTE_free(attr);
 933                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 934                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 935                                 goto end;
 936                                 }
 937                         }
 938                 goto new_attrib;
 939                 }
 940 end:
 941         return(1);
 942         }
 943