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 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
  71         {
  72         int i,j;
  73         BIO *out=NULL,*btmp=NULL;
  74         X509_ALGOR *xa;
  75         const EVP_MD *evp_md;
  76         const EVP_CIPHER *evp_cipher=NULL;
  77         STACK_OF(X509_ALGOR) *md_sk=NULL;
  78         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
  79         X509_ALGOR *xalg=NULL;
  80         PKCS7_RECIP_INFO *ri=NULL;
  81         EVP_PKEY *pkey;
  82
  83         i=OBJ_obj2nid(p7->type);
  84         p7->state=PKCS7_S_HEADER;
  85
  86         switch (i)
  87                 {
  88         case NID_pkcs7_signed:
  89                 md_sk=p7->d.sign->md_algs;
  90                 break;
  91         case NID_pkcs7_signedAndEnveloped:
  92                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  93                 md_sk=p7->d.signed_and_enveloped->md_algs;
  94                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  95                 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
  96                 if (evp_cipher == NULL)
  97                         {
  98                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
  99                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 100                         goto err;
 101                         }
 102                 break;
 103         case NID_pkcs7_enveloped:
 104                 rsk=p7->d.enveloped->recipientinfo;
 105                 xalg=p7->d.enveloped->enc_data->algorithm;
 106                 evp_cipher=p7->d.enveloped->enc_data->cipher;
 107                 if (evp_cipher == NULL)
 108                         {
 109                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,
 110                                                 PKCS7_R_CIPHER_NOT_INITIALIZED);
 111                         goto err;
 112                         }
 113                 break;
 114         default:
 115                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 116                 goto err;
 117                 }
 118
 119         if (md_sk != NULL)
 120                 {
 121                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 122                         {
 123                         xa=sk_X509_ALGOR_value(md_sk,i);
 124                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 125                                 {
 126                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 127                                 goto err;
 128                                 }
 129
 130                         j=OBJ_obj2nid(xa->algorithm);
 131                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 132                         if (evp_md == NULL)
 133                                 {
 134                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 135                                 goto err;
 136                                 }
 137
 138                         BIO_set_md(btmp,evp_md);
 139                         if (out == NULL)
 140                                 out=btmp;
 141                         else
 142                                 BIO_push(out,btmp);
 143                         btmp=NULL;
 144                         }
 145                 }
 146
 147         if (evp_cipher != NULL)
 148                 {
 149                 unsigned char key[EVP_MAX_KEY_LENGTH];
 150                 unsigned char iv[EVP_MAX_IV_LENGTH];
 151                 int keylen,ivlen;
 152                 int jj,max;
 153                 unsigned char *tmp;
 154                 EVP_CIPHER_CTX *ctx;
 155
 156                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
 157                         {
 158                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
 159                         goto err;
 160                         }
 161                 BIO_get_cipher_ctx(btmp, &ctx);
 162                 keylen=EVP_CIPHER_key_length(evp_cipher);
 163                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 164                 RAND_bytes(key,keylen);
 165                 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
 166                 if (ivlen > 0) RAND_bytes(iv,ivlen);
 167                 EVP_CipherInit(ctx, evp_cipher, key, iv, 1);
 168
 169                 if (ivlen > 0) {
 170                         if (xalg->parameter == NULL)
 171                                                 xalg->parameter=ASN1_TYPE_new();
 172                         if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
 173                                                                        goto err;
 174                 }
 175
 176                 /* Lets do the pub key stuff :-) */
 177                 max=0;
 178                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 179                         {
 180                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 181                         if (ri->cert == NULL)
 182                                 {
 183                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_MISSING_CERIPEND_INFO);
 184                                 goto err;
 185                                 }
 186                         pkey=X509_get_pubkey(ri->cert);
 187                         jj=EVP_PKEY_size(pkey);
 188                         EVP_PKEY_free(pkey);
 189                         if (max < jj) max=jj;
 190                         }
 191                 if ((tmp=(unsigned char *)Malloc(max)) == NULL)
 192                         {
 193                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_MALLOC_FAILURE);
 194                         goto err;
 195                         }
 196                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
 197                         {
 198                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 199                         pkey=X509_get_pubkey(ri->cert);
 200                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 201                         EVP_PKEY_free(pkey);
 202                         if (jj <= 0)
 203                                 {
 204                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_EVP_LIB);
 205                                 Free(tmp);
 206                                 goto err;
 207                                 }
 208                         M_ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 209                         }
 210                 Free(tmp);
 211                 memset(key, 0, keylen);
 212
 213                 if (out == NULL)
 214                         out=btmp;
 215                 else
 216                         BIO_push(out,btmp);
 217                 btmp=NULL;
 218                 }
 219
 220         if (bio == NULL) {
 221                 if (p7->detached)
 222                         bio=BIO_new(BIO_s_null());
 223                 else {
 224                         if (PKCS7_type_is_signed(p7) &&
 225                                 PKCS7_type_is_data(p7->d.sign->contents)) {
 226                                 ASN1_OCTET_STRING *os;
 227                                 os=p7->d.sign->contents->d.data;
 228                                 if (os->length > 0) bio =
 229                                         BIO_new_mem_buf(os->data, os->length);
 230                         }
 231                         if(bio == NULL) {
 232                                 bio=BIO_new(BIO_s_mem());
 233                                 BIO_set_mem_eof_return(bio,0);
 234                         }
 235                 }
 236         }
 237         BIO_push(out,bio);
 238         bio=NULL;
 239         if (0)
 240                 {
 241 err:
 242                 if (out != NULL)
 243                         BIO_free_all(out);
 244                 if (btmp != NULL)
 245                         BIO_free_all(btmp);
 246                 out=NULL;
 247                 }
 248         return(out);
 249         }
 250
 251 /* int */
 252 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 253         {
 254         int i,j;
 255         BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
 256         unsigned char *tmp=NULL;
 257         X509_ALGOR *xa;
 258         ASN1_OCTET_STRING *data_body=NULL;
 259         const EVP_MD *evp_md;
 260         const EVP_CIPHER *evp_cipher=NULL;
 261         EVP_CIPHER_CTX *evp_ctx=NULL;
 262         X509_ALGOR *enc_alg=NULL;
 263         STACK_OF(X509_ALGOR) *md_sk=NULL;
 264         STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
 265         X509_ALGOR *xalg=NULL;
 266         PKCS7_RECIP_INFO *ri=NULL;
 267 #ifndef NO_RC2
 268         char is_rc2 = 0;
 269 #endif
 270 /*      EVP_PKEY *pkey; */
 271 #if 0
 272         X509_STORE_CTX s_ctx;
 273 #endif
 274
 275         i=OBJ_obj2nid(p7->type);
 276         p7->state=PKCS7_S_HEADER;
 277
 278         switch (i)
 279                 {
 280         case NID_pkcs7_signed:
 281                 data_body=p7->d.sign->contents->d.data;
 282                 md_sk=p7->d.sign->md_algs;
 283                 break;
 284         case NID_pkcs7_signedAndEnveloped:
 285                 rsk=p7->d.signed_and_enveloped->recipientinfo;
 286                 md_sk=p7->d.signed_and_enveloped->md_algs;
 287                 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 288                 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 289                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 290                 if (evp_cipher == NULL)
 291                         {
 292                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 293                         goto err;
 294                         }
 295                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
 296                 break;
 297         case NID_pkcs7_enveloped:
 298                 rsk=p7->d.enveloped->recipientinfo;
 299                 enc_alg=p7->d.enveloped->enc_data->algorithm;
 300                 data_body=p7->d.enveloped->enc_data->enc_data;
 301                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm)));
 302                 if (evp_cipher == NULL)
 303                         {
 304                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 305                         goto err;
 306                         }
 307                 xalg=p7->d.enveloped->enc_data->algorithm;
 308                 break;
 309         default:
 310                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 311                 goto err;
 312                 }
 313
 314         if(EVP_CIPHER_nid(evp_cipher) == NID_rc2_cbc)
 315                 {
 316 #ifndef NO_RC2
 317                 is_rc2 = 1;
 318 #else
 319                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
 320                 goto err;
 321 #endif
 322                 }
 323
 324         /* We will be checking the signature */
 325         if (md_sk != NULL)
 326                 {
 327                 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
 328                         {
 329                         xa=sk_X509_ALGOR_value(md_sk,i);
 330                         if ((btmp=BIO_new(BIO_f_md())) == NULL)
 331                                 {
 332                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 333                                 goto err;
 334                                 }
 335
 336                         j=OBJ_obj2nid(xa->algorithm);
 337                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 338                         if (evp_md == NULL)
 339                                 {
 340                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 341                                 goto err;
 342                                 }
 343
 344                         BIO_set_md(btmp,evp_md);
 345                         if (out == NULL)
 346                                 out=btmp;
 347                         else
 348                                 BIO_push(out,btmp);
 349                         btmp=NULL;
 350                         }
 351                 }
 352
 353         if (evp_cipher != NULL)
 354                 {
 355 #if 0
 356                 unsigned char key[EVP_MAX_KEY_LENGTH];
 357                 unsigned char iv[EVP_MAX_IV_LENGTH];
 358                 unsigned char *p;
 359                 int keylen,ivlen;
 360                 int max;
 361                 X509_OBJECT ret;
 362 #endif
 363                 int jj;
 364
 365                 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
 366                         {
 367                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
 368                         goto err;
 369                         }
 370
 371                 /* It was encrypted, we need to decrypt the secret key
 372                  * with the private key */
 373
 374                 /* Find the recipientInfo which matches the passed certificate
 375                  * (if any)
 376                  */
 377
 378                 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++) {
 379                         ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
 380                         if(!X509_NAME_cmp(ri->issuer_and_serial->issuer,
 381                                         pcert->cert_info->issuer) &&
 382                              !M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
 383                                         ri->issuer_and_serial->serial)) break;
 384                         ri=NULL;
 385                 }
 386                 if (ri == NULL) {
 387                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 388                                  PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
 389                         return(NULL);
 390                 }
 391
 392                 jj=EVP_PKEY_size(pkey);
 393                 tmp=(unsigned char *)Malloc(jj+10);
 394                 if (tmp == NULL)
 395                         {
 396                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_MALLOC_FAILURE);
 397                         goto err;
 398                         }
 399
 400                 jj=EVP_PKEY_decrypt(tmp, M_ASN1_STRING_data(ri->enc_key),
 401                         M_ASN1_STRING_length(ri->enc_key), pkey);
 402                 if (jj <= 0)
 403                         {
 404                         PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_EVP_LIB);
 405                         goto err;
 406                         }
 407
 408                 evp_ctx=NULL;
 409                 BIO_get_cipher_ctx(etmp,&evp_ctx);
 410                 EVP_CipherInit(evp_ctx,evp_cipher,NULL,NULL,0);
 411                 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
 412                         return(NULL);
 413
 414                 if (jj != EVP_CIPHER_CTX_key_length(evp_ctx)) {
 415                         /* HACK: some S/MIME clients don't use the same key
 416                          * and effective key length. The key length is
 417                          * determined by the size of the decrypted RSA key.
 418                          * So we hack things to manually set the RC2 key
 419                          * because we currently can't do this with the EVP
 420                          * interface.
 421                          */
 422 #ifndef NO_RC2
 423                         if(is_rc2) RC2_set_key(&(evp_ctx->c.rc2_ks),jj, tmp,
 424                                         EVP_CIPHER_CTX_key_length(evp_ctx)*8);
 425                         else
 426 #endif
 427                                 {
 428                                 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
 429                                         PKCS7_R_DECRYPTED_KEY_IS_WRONG_LENGTH);
 430                                 goto err;
 431                                 }
 432                 } else EVP_CipherInit(evp_ctx,NULL,tmp,NULL,0);
 433
 434                 memset(tmp,0,jj);
 435
 436                 if (out == NULL)
 437                         out=etmp;
 438                 else
 439                         BIO_push(out,etmp);
 440                 etmp=NULL;
 441                 }
 442
 443 #if 1
 444         if (p7->detached || (in_bio != NULL))
 445                 {
 446                 bio=in_bio;
 447                 }
 448         else
 449                 {
 450 #if 0
 451                 bio=BIO_new(BIO_s_mem());
 452                 /* We need to set this so that when we have read all
 453                  * the data, the encrypt BIO, if present, will read
 454                  * EOF and encode the last few bytes */
 455                 BIO_set_mem_eof_return(bio,0);
 456
 457                 if (data_body->length > 0)
 458                         BIO_write(bio,(char *)data_body->data,data_body->length);
 459 #else
 460                 if (data_body->length > 0)
 461                       bio = BIO_new_mem_buf(data_body->data,data_body->length);
 462                 else {
 463                         bio=BIO_new(BIO_s_mem());
 464                         BIO_set_mem_eof_return(bio,0);
 465                 }
 466 #endif
 467                 }
 468         BIO_push(out,bio);
 469         bio=NULL;
 470 #endif
 471         if (0)
 472                 {
 473 err:
 474                 if (out != NULL) BIO_free_all(out);
 475                 if (btmp != NULL) BIO_free_all(btmp);
 476                 if (etmp != NULL) BIO_free_all(etmp);
 477                 if (bio != NULL) BIO_free_all(bio);
 478                 out=NULL;
 479                 }
 480         if (tmp != NULL)
 481                 Free(tmp);
 482         return(out);
 483         }
 484
 485 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 486         {
 487         int ret=0;
 488         int i,j;
 489         BIO *btmp;
 490         BUF_MEM *buf_mem=NULL;
 491         BUF_MEM *buf=NULL;
 492         PKCS7_SIGNER_INFO *si;
 493         EVP_MD_CTX *mdc,ctx_tmp;
 494         STACK_OF(X509_ATTRIBUTE) *sk;
 495         STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 496         unsigned char *p,*pp=NULL;
 497         int x;
 498         ASN1_OCTET_STRING *os=NULL;
 499
 500         i=OBJ_obj2nid(p7->type);
 501         p7->state=PKCS7_S_HEADER;
 502
 503         switch (i)
 504                 {
 505         case NID_pkcs7_signedAndEnveloped:
 506                 /* XXXXXXXXXXXXXXXX */
 507                 si_sk=p7->d.signed_and_enveloped->signer_info;
 508                 os=M_ASN1_OCTET_STRING_new();
 509                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 510                 break;
 511         case NID_pkcs7_enveloped:
 512                 /* XXXXXXXXXXXXXXXX */
 513                 os=M_ASN1_OCTET_STRING_new();
 514                 p7->d.enveloped->enc_data->enc_data=os;
 515                 break;
 516         case NID_pkcs7_signed:
 517                 si_sk=p7->d.sign->signer_info;
 518                 os=p7->d.sign->contents->d.data;
 519                 /* If detached data then the content is excluded */
 520                 if(p7->detached) {
 521                         M_ASN1_OCTET_STRING_free(os);
 522                         p7->d.sign->contents->d.data = NULL;
 523                 }
 524                 break;
 525                 }
 526
 527         if (si_sk != NULL)
 528                 {
 529                 if ((buf=BUF_MEM_new()) == NULL)
 530                         {
 531                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 532                         goto err;
 533                         }
 534                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
 535                         {
 536                         si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
 537                         if (si->pkey == NULL) continue;
 538
 539                         j=OBJ_obj2nid(si->digest_alg->algorithm);
 540
 541                         btmp=bio;
 542                         for (;;)
 543                                 {
 544                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 545                                         == NULL)
 546                                         {
 547                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 548                                         goto err;
 549                                         }
 550                                 BIO_get_md_ctx(btmp,&mdc);
 551                                 if (mdc == NULL)
 552                                         {
 553                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 554                                         goto err;
 555                                         }
 556                                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == j)
 557                                         break;
 558                                 else
 559                                         btmp=btmp->next_bio;
 560                                 }
 561
 562                         /* We now have the EVP_MD_CTX, lets do the
 563                          * signing. */
 564                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 565                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 566                                 {
 567                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_BIO_LIB);
 568                                 goto err;
 569                                 }
 570
 571                         sk=si->auth_attr;
 572
 573                         /* If there are attributes, we add the digest
 574                          * attribute and only sign the attributes */
 575                         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 576                                 {
 577                                 unsigned char md_data[EVP_MAX_MD_SIZE];
 578                                 unsigned int md_len;
 579                                 ASN1_OCTET_STRING *digest;
 580                                 ASN1_UTCTIME *sign_time;
 581                                 const EVP_MD *md_tmp;
 582
 583                                 /* Add signing time */
 584                                 sign_time=X509_gmtime_adj(NULL,0);
 585                                 PKCS7_add_signed_attribute(si,
 586                                         NID_pkcs9_signingTime,
 587                                         V_ASN1_UTCTIME,sign_time);
 588
 589                                 /* Add digest */
 590                                 md_tmp=EVP_MD_CTX_type(&ctx_tmp);
 591                                 EVP_DigestFinal(&ctx_tmp,md_data,&md_len);
 592                                 digest=M_ASN1_OCTET_STRING_new();
 593                                 M_ASN1_OCTET_STRING_set(digest,md_data,md_len);
 594                                 PKCS7_add_signed_attribute(si,
 595                                         NID_pkcs9_messageDigest,
 596                                         V_ASN1_OCTET_STRING,digest);
 597
 598                                 /* Now sign the mess */
 599                                 EVP_SignInit(&ctx_tmp,md_tmp);
 600                                 x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,
 601                                            i2d_X509_ATTRIBUTE,
 602                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 603                                 pp=(unsigned char *)Malloc(x);
 604                                 p=pp;
 605                                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,
 606                                            i2d_X509_ATTRIBUTE,
 607                                            V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET);
 608                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 609                                 Free(pp);
 610                                 pp=NULL;
 611                                 }
 612
 613                         if (si->pkey->type == EVP_PKEY_DSA)
 614                                 ctx_tmp.digest=EVP_dss1();
 615
 616                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 617                                 (unsigned int *)&buf->length,si->pkey))
 618                                 {
 619                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_EVP_LIB);
 620                                 goto err;
 621                                 }
 622                         if (!ASN1_STRING_set(si->enc_digest,
 623                                 (unsigned char *)buf->data,buf->length))
 624                                 {
 625                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,ERR_R_ASN1_LIB);
 626                                 goto err;
 627                                 }
 628                         }
 629                 }
 630
 631         if (!p7->detached)
 632                 {
 633                 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 634                 if (btmp == NULL)
 635                         {
 636                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 637                         goto err;
 638                         }
 639                 BIO_get_mem_ptr(btmp,&buf_mem);
 640                 /* Mark the BIO read only then we can use its copy of the data
 641                  * instead of making an extra copy.
 642                  */
 643                 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
 644                 BIO_set_mem_eof_return(btmp, 0);
 645                 os->data = (unsigned char *)buf_mem->data;
 646                 os->length = buf_mem->length;
 647 #if 0
 648                 M_ASN1_OCTET_STRING_set(os,
 649                         (unsigned char *)buf_mem->data,buf_mem->length);
 650 #endif
 651                 }
 652         if (pp != NULL) Free(pp);
 653         pp=NULL;
 654
 655         ret=1;
 656 err:
 657         if (buf != NULL) BUF_MEM_free(buf);
 658         return(ret);
 659         }
 660
 661 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
 662              PKCS7 *p7, PKCS7_SIGNER_INFO *si)
 663         {
 664         PKCS7_ISSUER_AND_SERIAL *ias;
 665         int ret=0,i;
 666         STACK_OF(X509) *cert;
 667         X509 *x509;
 668
 669         if (PKCS7_type_is_signed(p7))
 670                 {
 671                 cert=p7->d.sign->cert;
 672                 }
 673         else if (PKCS7_type_is_signedAndEnveloped(p7))
 674                 {
 675                 cert=p7->d.signed_and_enveloped->cert;
 676                 }
 677         else
 678                 {
 679                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
 680                 goto err;
 681                 }
 682         /* XXXXXXXXXXXXXXXXXXXXXXX */
 683         ias=si->issuer_and_serial;
 684
 685         x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
 686
 687         /* were we able to find the cert in passed to us */
 688         if (x509 == NULL)
 689                 {
 690                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 691                 goto err;
 692                 }
 693
 694         /* Lets verify */
 695         X509_STORE_CTX_init(ctx,cert_store,x509,cert);
 696         X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
 697         i=X509_verify_cert(ctx);
 698         if (i <= 0)
 699                 {
 700                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
 701                 goto err;
 702                 }
 703         X509_STORE_CTX_cleanup(ctx);
 704
 705         return PKCS7_signatureVerify(bio, p7, si, x509);
 706         err:
 707         return ret;
 708         }
 709
 710 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
 711                                                                 X509 *x509)
 712         {
 713         ASN1_OCTET_STRING *os;
 714         EVP_MD_CTX mdc_tmp,*mdc;
 715         unsigned char *pp,*p;
 716         int ret=0,i;
 717         int md_type;
 718         STACK_OF(X509_ATTRIBUTE) *sk;
 719         BIO *btmp;
 720         EVP_PKEY *pkey;
 721
 722         if (!PKCS7_type_is_signed(p7) &&
 723                                 !PKCS7_type_is_signedAndEnveloped(p7)) {
 724                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 725                                                 PKCS7_R_WRONG_PKCS7_TYPE);
 726                 goto err;
 727         }
 728
 729         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 730
 731         btmp=bio;
 732         for (;;)
 733                 {
 734                 if ((btmp == NULL) ||
 735                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 736                         {
 737                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 738                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 739                         goto err;
 740                         }
 741                 BIO_get_md_ctx(btmp,&mdc);
 742                 if (mdc == NULL)
 743                         {
 744                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 745                                                         PKCS7_R_INTERNAL_ERROR);
 746                         goto err;
 747                         }
 748                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 749                         break;
 750                 btmp=btmp->next_bio;
 751                 }
 752
 753         /* mdc is the digest ctx that we want, unless there are attributes,
 754          * in which case the digest is the signed attributes */
 755         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 756
 757         sk=si->auth_attr;
 758         if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
 759                 {
 760                 unsigned char md_dat[EVP_MAX_MD_SIZE];
 761                 unsigned int md_len;
 762                 ASN1_OCTET_STRING *message_digest;
 763
 764                 EVP_DigestFinal(&mdc_tmp,md_dat,&md_len);
 765                 message_digest=PKCS7_digest_from_attributes(sk);
 766                 if (!message_digest)
 767                         {
 768                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 769                                         PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 770                         goto err;
 771                         }
 772                 if ((message_digest->length != (int)md_len) ||
 773                         (memcmp(message_digest->data,md_dat,md_len)))
 774                         {
 775 #if 0
 776 {
 777 int ii;
 778 for (ii=0; ii<message_digest->length; ii++)
 779         printf("%02X",message_digest->data[ii]); printf(" sent\n");
 780 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
 781 }
 782 #endif
 783                         PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 784                                                         PKCS7_R_DIGEST_FAILURE);
 785                         ret= -1;
 786                         goto err;
 787                         }
 788
 789                 EVP_VerifyInit(&mdc_tmp,EVP_get_digestbynid(md_type));
 790                 /* Note: when forming the encoding of the attributes we
 791                  * shouldn't reorder them or this will break the signature.
 792                  * This is done by using the IS_SEQUENCE flag.
 793                  */
 794                 i=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL,i2d_X509_ATTRIBUTE,
 795                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 796                 pp=Malloc(i);
 797                 p=pp;
 798                 i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p,i2d_X509_ATTRIBUTE,
 799                         V_ASN1_SET,V_ASN1_UNIVERSAL, IS_SEQUENCE);
 800                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 801
 802                 Free(pp);
 803                 }
 804
 805         os=si->enc_digest;
 806         pkey = X509_get_pubkey(x509);
 807         if(pkey->type == EVP_PKEY_DSA) mdc_tmp.digest=EVP_dss1();
 808
 809         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
 810         EVP_PKEY_free(pkey);
 811         if (i <= 0)
 812                 {
 813                 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
 814                                                 PKCS7_R_SIGNATURE_FAILURE);
 815                 ret= -1;
 816                 goto err;
 817                 }
 818         else
 819                 ret=1;
 820 err:
 821         return(ret);
 822         }
 823
 824 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
 825         {
 826         STACK_OF(PKCS7_RECIP_INFO) *rsk;
 827         PKCS7_RECIP_INFO *ri;
 828         int i;
 829
 830         i=OBJ_obj2nid(p7->type);
 831         if (i != NID_pkcs7_signedAndEnveloped) return(NULL);
 832         rsk=p7->d.signed_and_enveloped->recipientinfo;
 833         ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
 834         if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
 835         ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
 836         return(ri->issuer_and_serial);
 837         }
 838
 839 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
 840         {
 841         return(get_attribute(si->auth_attr,nid));
 842         }
 843
 844 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
 845         {
 846         return(get_attribute(si->unauth_attr,nid));
 847         }
 848
 849 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
 850         {
 851         int i;
 852         X509_ATTRIBUTE *xa;
 853         ASN1_OBJECT *o;
 854
 855         o=OBJ_nid2obj(nid);
 856         if (!o || !sk) return(NULL);
 857         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 858                 {
 859                 xa=sk_X509_ATTRIBUTE_value(sk,i);
 860                 if (OBJ_cmp(xa->object,o) == 0)
 861                         {
 862                         if (xa->set && sk_ASN1_TYPE_num(xa->value.set))
 863                                 return(sk_ASN1_TYPE_value(xa->value.set,0));
 864                         else
 865                                 return(NULL);
 866                         }
 867                 }
 868         return(NULL);
 869         }
 870
 871 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
 872 {
 873         ASN1_TYPE *astype;
 874         if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
 875         return astype->value.octet_string;
 876 }
 877
 878 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
 879                                 STACK_OF(X509_ATTRIBUTE) *sk)
 880         {
 881         int i;
 882
 883         if (p7si->auth_attr != NULL)
 884                 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
 885         p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
 886         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 887                 {
 888                 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
 889                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 890                     == NULL)
 891                         return(0);
 892                 }
 893         return(1);
 894         }
 895
 896 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
 897         {
 898         int i;
 899
 900         if (p7si->unauth_attr != NULL)
 901                 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
 902                                            X509_ATTRIBUTE_free);
 903         p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
 904         for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
 905                 {
 906                 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
 907                         X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
 908                     == NULL)
 909                         return(0);
 910                 }
 911         return(1);
 912         }
 913
 914 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 915              void *value)
 916         {
 917         return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
 918         }
 919
 920 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
 921              void *value)
 922         {
 923         return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
 924         }
 925
 926 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
 927                          void *value)
 928         {
 929         X509_ATTRIBUTE *attr=NULL;
 930
 931         if (*sk == NULL)
 932                 {
 933                 *sk = sk_X509_ATTRIBUTE_new(NULL);
 934 new_attrib:
 935                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 936                 sk_X509_ATTRIBUTE_push(*sk,attr);
 937                 }
 938         else
 939                 {
 940                 int i;
 941
 942                 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
 943                         {
 944                         attr=sk_X509_ATTRIBUTE_value(*sk,i);
 945                         if (OBJ_obj2nid(attr->object) == nid)
 946                                 {
 947                                 X509_ATTRIBUTE_free(attr);
 948                                 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
 949                                 sk_X509_ATTRIBUTE_set(*sk,i,attr);
 950                                 goto end;
 951                                 }
 952                         }
 953                 goto new_attrib;
 954                 }
 955 end:
 956         return(1);
 957         }
 958