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 "rand.h"
  62 #include "objects.h"
  63 #include "x509.h"
  64
  65 BIO *PKCS7_dataInit(p7,bio)
  66 PKCS7 *p7;
  67 BIO *bio;
  68         {
  69         int i,j;
  70         BIO *out=NULL,*btmp;
  71         X509_ALGOR *xa;
  72         EVP_MD *evp_md;
  73         EVP_CIPHER *evp_cipher=NULL;
  74         STACK *md_sk=NULL,*rsk=NULL;
  75         X509_ALGOR *xalg=NULL;
  76         PKCS7_RECIP_INFO *ri=NULL;
  77         EVP_PKEY *pkey;
  78
  79         i=OBJ_obj2nid(p7->type);
  80         p7->state=PKCS7_S_HEADER;
  81
  82         switch (i)
  83                 {
  84         case NID_pkcs7_signed:
  85                 md_sk=p7->d.sign->md_algs;
  86                 break;
  87         case NID_pkcs7_signedAndEnveloped:
  88                 rsk=p7->d.signed_and_enveloped->recipientinfo;
  89                 md_sk=p7->d.signed_and_enveloped->md_algs;
  90                 evp_cipher=EVP_get_cipherbyname(OBJ_nid2sn(OBJ_obj2nid(p7->d.signed_and_enveloped->enc_data->algorithm->algorithm)));
  91                 if (evp_cipher == NULL)
  92                         {
  93                         PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
  94                         goto err;
  95                         }
  96                 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
  97                 break;
  98         default:
  99                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 100                 goto err;
 101                 }
 102
 103         if (md_sk != NULL)
 104                 {
 105                 for (i=0; i<sk_num(md_sk); i++)
 106                         {
 107                         xa=(X509_ALGOR *)sk_value(md_sk,i);
 108                         if ((btmp=BIO_new(BIO_f_md())) == NULL) goto err;
 109
 110                         j=OBJ_obj2nid(xa->algorithm);
 111                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
 112                         if (evp_md == NULL)
 113                                 {
 114                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
 115                                 goto err;
 116                                 }
 117
 118                         BIO_set_md(btmp,evp_md);
 119                         if (out == NULL)
 120                                 out=btmp;
 121                         else
 122                                 BIO_push(out,btmp);
 123                         }
 124                 }
 125
 126         if (evp_cipher != NULL)
 127                 {
 128                 unsigned char key[EVP_MAX_KEY_LENGTH];
 129                 unsigned char iv[EVP_MAX_IV_LENGTH];
 130                 int keylen,ivlen;
 131                 int jj,max;
 132                 unsigned char *tmp;
 133
 134                 if ((btmp=BIO_new(BIO_f_cipher())) == NULL) goto err;
 135                 keylen=EVP_CIPHER_key_length(evp_cipher);
 136                 ivlen=EVP_CIPHER_iv_length(evp_cipher);
 137
 138                 if (ivlen > 0)
 139                         {
 140                         ASN1_OCTET_STRING *os;
 141
 142                         RAND_bytes(iv,ivlen);
 143                         os=ASN1_OCTET_STRING_new();
 144                         ASN1_OCTET_STRING_set(os,iv,ivlen);
 145                 /*      ASN1_TYPE_set(xalg->parameter,V_ASN1_OCTET_STRING,
 146                                 (char *)os);
 147                 */      }
 148                 RAND_bytes(key,keylen);
 149
 150                 /* Lets do the pub key stuff :-) */
 151                 max=0;
 152                 for (i=0; i<sk_num(rsk); i++)
 153                         {
 154                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 155                         if (ri->cert == NULL) abort();
 156                         pkey=X509_get_pubkey(ri->cert);
 157                         jj=EVP_PKEY_size(pkey);
 158                         if (max < jj) max=jj;
 159                         }
 160                 if ((tmp=(unsigned char *)Malloc(max)) == NULL) abort();
 161                 for (i=0; i<sk_num(rsk); i++)
 162                         {
 163                         ri=(PKCS7_RECIP_INFO *)sk_value(rsk,i);
 164                         pkey=X509_get_pubkey(ri->cert);
 165                         jj=EVP_PKEY_encrypt(tmp,key,keylen,pkey);
 166                         if (jj <= 0) abort();
 167                         ASN1_OCTET_STRING_set(ri->enc_key,tmp,jj);
 168                         }
 169
 170                 BIO_set_cipher(btmp,evp_cipher,key,iv,1);
 171
 172                 if (out == NULL)
 173                         out=btmp;
 174                 else
 175                         BIO_push(out,btmp);
 176                 }
 177
 178         if (bio == NULL) /* ??????????? */
 179                 {
 180                 if (p7->detached)
 181                         bio=BIO_new(BIO_s_null());
 182                 else
 183                         {
 184                         bio=BIO_new(BIO_s_mem());
 185                         if (PKCS7_type_is_signed(p7) &&
 186                                 PKCS7_type_is_data(p7->d.sign->contents))
 187                                 {
 188                                 ASN1_OCTET_STRING *os;
 189
 190                                 os=p7->d.sign->contents->d.data;
 191                                 if (os->length > 0)
 192                                         BIO_write(bio,(char *)os->data,
 193                                                 os->length);
 194                                 }
 195                         }
 196                 }
 197         BIO_push(out,bio);
 198         return(out);
 199 err:
 200         return(NULL);
 201         }
 202
 203 int PKCS7_dataSign(p7,bio)
 204 PKCS7 *p7;
 205 BIO *bio;
 206         {
 207         int ret=0;
 208         int i,j;
 209         BIO *btmp;
 210         BUF_MEM *buf_mem=NULL;
 211         BUF_MEM *buf=NULL;
 212         PKCS7_SIGNER_INFO *si;
 213         EVP_MD_CTX *mdc,ctx_tmp;
 214         STACK *sk,*si_sk=NULL;
 215         unsigned char *p,*pp=NULL;
 216         int x;
 217         ASN1_OCTET_STRING *os=NULL;
 218
 219         i=OBJ_obj2nid(p7->type);
 220         p7->state=PKCS7_S_HEADER;
 221
 222         switch (i)
 223                 {
 224         case NID_pkcs7_signedAndEnveloped:
 225                 /* XXXXXXXXXXXXXXXX */
 226                 si_sk=p7->d.signed_and_enveloped->signer_info;
 227                 os=ASN1_OCTET_STRING_new();
 228                 p7->d.signed_and_enveloped->enc_data->enc_data=os;
 229                 break;
 230         case NID_pkcs7_signed:
 231                 si_sk=p7->d.sign->signer_info;
 232                 os=p7->d.sign->contents->d.data;
 233                 break;
 234                 }
 235
 236         if (si_sk != NULL)
 237                 {
 238                 if ((buf=BUF_MEM_new()) == NULL) goto err;
 239                 for (i=0; i<sk_num(si_sk); i++)
 240                         {
 241                         si=(PKCS7_SIGNER_INFO *)
 242                                 sk_value(si_sk,i);
 243                         if (si->pkey == NULL)
 244                                 continue;
 245                         j=OBJ_obj2nid(si->digest_enc_alg->algorithm);
 246
 247                         btmp=bio;
 248                         for (;;)
 249                                 {
 250                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 251                                         == NULL)
 252                                         {
 253                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 254                                         goto err;
 255                                         }
 256                                 BIO_get_md_ctx(btmp,&mdc);
 257                                 if (mdc == NULL)
 258                                         {
 259                                         PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_INTERNAL_ERROR);
 260                                         goto err;
 261                                         }
 262                                 if (EVP_MD_pkey_type(EVP_MD_CTX_type(mdc)) == j)
 263                                         break;
 264                                 else
 265                                         btmp=btmp->next_bio;
 266                                 }
 267
 268                         /* We now have the EVP_MD_CTX, lets do the
 269                          * signing. */
 270                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 271                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 272                                 goto err;
 273
 274                         sk=si->auth_attr;
 275                         if ((sk != NULL) && (sk_num(sk) != 0))
 276                                 {
 277                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 278                                         V_ASN1_SET,V_ASN1_UNIVERSAL);
 279                                 pp=(unsigned char *)Malloc(i);
 280                                 p=pp;
 281                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 282                                         V_ASN1_SET,V_ASN1_UNIVERSAL);
 283                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 284                                 Free(pp);
 285                                 }
 286
 287                         if (!EVP_SignFinal(&ctx_tmp,(unsigned char *)buf->data,
 288                                 (unsigned int *)&buf->length,si->pkey))
 289                                 goto err;
 290                         if (!ASN1_STRING_set(si->enc_digest,
 291                                 (unsigned char *)buf->data,buf->length))
 292                                 goto err;
 293                         }
 294                 if (p7->detached)
 295                         ASN1_OCTET_STRING_set(os,(unsigned char *)"",0);
 296                 else
 297                         {
 298                         btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 299                         if (btmp == NULL)
 300                                 {
 301                                 PKCS7err(PKCS7_F_PKCS7_DATASIGN,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 302                                 goto err;
 303                                 }
 304                         BIO_get_mem_ptr(btmp,&buf_mem);
 305                         ASN1_OCTET_STRING_set(os,
 306                                 (unsigned char *)buf_mem->data,buf_mem->length);
 307                         }
 308                 if (pp != NULL) Free(pp);
 309                 pp=NULL;
 310                 }
 311
 312         ret=1;
 313 err:
 314         if (buf != NULL) BUF_MEM_free(buf);
 315         return(ret);
 316         }
 317
 318 int PKCS7_dataVerify(cert_store,ctx,bio,p7,si)
 319 X509_STORE *cert_store;
 320 X509_STORE_CTX *ctx;
 321 BIO *bio;
 322 PKCS7 *p7;
 323 PKCS7_SIGNER_INFO *si;
 324         {
 325         PKCS7_SIGNED *s;
 326         ASN1_OCTET_STRING *os;
 327         EVP_MD_CTX mdc_tmp,*mdc;
 328         unsigned char *pp,*p;
 329         PKCS7_ISSUER_AND_SERIAL *ias;
 330         int ret=0,md_type,i;
 331         STACK *sk;
 332         BIO *btmp;
 333         X509 *x509;
 334
 335         if (!PKCS7_type_is_signed(p7)) abort();
 336         /* XXXXXXXXXXXXXXXXXXXXXXX */
 337         ias=si->issuer_and_serial;
 338         s=p7->d.sign;
 339
 340         x509=X509_find_by_issuer_and_serial(s->cert,ias->issuer,ias->serial);
 341
 342         /* were we able to find the cert in passed to us */
 343         if (x509 == NULL)
 344                 {
 345                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 346                 goto err;
 347                 }
 348
 349         /* Lets verify */
 350         X509_STORE_CTX_init(ctx,cert_store,x509,s->cert);
 351         i=X509_verify_cert(ctx);
 352         if (i <= 0) goto err;
 353         X509_STORE_CTX_cleanup(ctx);
 354
 355         /* So we like 'x509', lets check the signature. */
 356         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 357
 358         btmp=bio;
 359         for (;;)
 360                 {
 361                 if ((btmp == NULL) ||
 362                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 363                         {
 364                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 365                         goto err;
 366                         }
 367                 BIO_get_md_ctx(btmp,&mdc);
 368                 if (mdc == NULL)
 369                         {
 370                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
 371                         goto err;
 372                         }
 373                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 374                         break;
 375                 btmp=btmp->next_bio;
 376                 }
 377
 378         /* mdc is the digest ctx that we want */
 379         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 380
 381         sk=si->auth_attr;
 382         if ((sk != NULL) && (sk_num(sk) != 0))
 383                 {
 384                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 385                         V_ASN1_SET,V_ASN1_UNIVERSAL);
 386                 pp=(unsigned char *)malloc(i);
 387                 p=pp;
 388                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 389                         V_ASN1_SET,V_ASN1_UNIVERSAL);
 390                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 391                 free(pp);
 392                 }
 393
 394         os=si->enc_digest;
 395         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length,
 396                 X509_get_pubkey(x509));
 397         if (i <= 0)
 398                 {
 399                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
 400                 ret= -1;
 401                 goto err;
 402                 }
 403         else
 404                 ret=1;
 405 err:
 406         return(ret);
 407         }
 408