crypto/pkcs7/pk7_doit.c

   1 /* crypto/pkcs7/pk7_doit.c */
   2 /* Copyright (C) 1995-1997 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 "objects.h"
  62 #include "x509.h"
  63
  64 BIO *PKCS7_dataInit(p7,bio)
  65 PKCS7 *p7;
  66 BIO *bio;
  67         {
  68         int i,j;
  69         BIO *out=NULL,*btmp;
  70         X509_ALGOR *xa;
  71         EVP_MD *evp_md;
  72
  73         i=OBJ_obj2nid(p7->type);
  74         p7->state=PKCS7_S_HEADER;
  75
  76         switch (i)
  77                 {
  78         case NID_pkcs7_signed:
  79                 for (i=0; i<sk_num(p7->d.sign->md_algs); i++)
  80                         {
  81                         xa=(X509_ALGOR *)sk_value(p7->d.sign->md_algs,i);
  82                         if ((btmp=BIO_new(BIO_f_md())) == NULL) goto err;
  83
  84                         j=OBJ_obj2nid(xa->algorithm);
  85                         evp_md=EVP_get_digestbyname(OBJ_nid2sn(j));
  86                         if (evp_md == NULL)
  87                                 {
  88                                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNKNOWN_DIGEST_TYPE);
  89                                 goto err;
  90                                 }
  91
  92                         BIO_set_md(btmp,evp_md);
  93                         if (out == NULL)
  94                                 out=btmp;
  95                         else
  96                                 BIO_push(out,btmp);
  97                         }
  98                 break;
  99         default:
 100                 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 101                 goto err;
 102                 }
 103         if (bio == NULL)
 104                 {
 105                 if (p7->detached)
 106                         bio=BIO_new(BIO_s_null());
 107                 else
 108                         {
 109                         bio=BIO_new(BIO_s_mem());
 110                         if (PKCS7_type_is_signed(p7) &&
 111                                 PKCS7_type_is_data(p7->d.sign->contents))
 112                                 {
 113                                 ASN1_OCTET_STRING *os;
 114
 115                                 os=p7->d.sign->contents->d.data;
 116                                 if (os->length > 0)
 117                                         BIO_write(bio,os->data,os->length);
 118                                 }
 119                         }
 120                 }
 121         BIO_push(out,bio);
 122         return(out);
 123 err:
 124         return(NULL);
 125         }
 126
 127 int PKCS7_dataSign(p7,bio)
 128 PKCS7 *p7;
 129 BIO *bio;
 130         {
 131         int ret=0;
 132         int i,j;
 133         BIO *btmp;
 134         BUF_MEM *buf_mem=NULL;
 135         BUF_MEM *buf=NULL;
 136         PKCS7_SIGNER_INFO *si;
 137         EVP_MD_CTX *mdc,ctx_tmp;
 138         STACK *sk;
 139         unsigned char *p,*pp=NULL;
 140         int x;
 141
 142         i=OBJ_obj2nid(p7->type);
 143         p7->state=PKCS7_S_HEADER;
 144
 145         switch (i)
 146                 {
 147         case NID_pkcs7_signed:
 148
 149                 if ((buf=BUF_MEM_new()) == NULL) goto err;
 150                 for (i=0; i<sk_num(p7->d.sign->signer_info); i++)
 151                         {
 152                         si=(PKCS7_SIGNER_INFO *)
 153                                 sk_value(p7->d.sign->signer_info,i);
 154                         if (si->pkey == NULL)
 155                                 continue;
 156                         j=OBJ_obj2nid(si->digest_enc_alg->algorithm);
 157
 158                         btmp=bio;
 159                         for (;;)
 160                                 {
 161                                 if ((btmp=BIO_find_type(btmp,BIO_TYPE_MD))
 162                                         == NULL)
 163                                         {
 164                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 165                                         goto err;
 166                                         }
 167                                 BIO_get_md_ctx(btmp,&mdc);
 168                                 if (mdc == NULL)
 169                                         {
 170                                         PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_INTERNAL_ERROR);
 171                                         goto err;
 172                                         }
 173                                 if (EVP_MD_pkey_type(EVP_MD_CTX_type(mdc)) == j)
 174                                         break;
 175                                 else
 176                                         btmp=btmp->next_bio;
 177                                 }
 178
 179                         /* We now have the EVP_MD_CTX, lets do the
 180                          * signing. */
 181                         memcpy(&ctx_tmp,mdc,sizeof(ctx_tmp));
 182                         if (!BUF_MEM_grow(buf,EVP_PKEY_size(si->pkey)))
 183                                 goto err;
 184
 185                         sk=si->auth_attr;
 186                         if ((sk != NULL) && (sk_num(sk) != 0))
 187                                 {
 188                                 x=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 189                                         V_ASN1_SET,V_ASN1_UNIVERSAL);
 190                                 pp=(unsigned char *)Malloc(i);
 191                                 p=pp;
 192                                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 193                                         V_ASN1_SET,V_ASN1_UNIVERSAL);
 194                                 EVP_SignUpdate(&ctx_tmp,pp,x);
 195                                 Free(pp);
 196                                 }
 197
 198                         if (!EVP_SignFinal(&ctx_tmp,buf->data,
 199                                 (unsigned int *)&buf->length,si->pkey))
 200                                 goto err;
 201                         if (!ASN1_STRING_set(si->enc_digest,
 202                                 (unsigned char *)buf->data,buf->length))
 203                                 goto err;
 204
 205                         }
 206                 if (p7->detached)
 207                         PKCS7_content_free(p7->d.sign->contents);
 208                 else
 209                         {
 210                         btmp=BIO_find_type(bio,BIO_TYPE_MEM);
 211                         if (btmp == NULL)
 212                                 {
 213                                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
 214                                 goto err;
 215                                 }
 216                         BIO_get_mem_ptr(btmp,&buf_mem);
 217                         ASN1_OCTET_STRING_set(p7->d.sign->contents->d.data,
 218                                 (unsigned char *)buf_mem->data,buf_mem->length);
 219                         }
 220                 if (pp != NULL) Free(pp);
 221                 pp=NULL;
 222                 break;
 223         default:
 224                 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
 225                 goto err;
 226                 }
 227
 228         if (p7->detached)
 229                 {
 230
 231                 }
 232         ret=1;
 233 err:
 234         if (buf != NULL) BUF_MEM_free(buf);
 235         return(ret);
 236         }
 237
 238 int PKCS7_dataVerify(cert_store,ctx,bio,p7,si)
 239 X509_STORE *cert_store;
 240 X509_STORE_CTX *ctx;
 241 BIO *bio;
 242 PKCS7 *p7;
 243 PKCS7_SIGNER_INFO *si;
 244         {
 245         PKCS7_SIGNED *s;
 246         ASN1_OCTET_STRING *os;
 247         EVP_MD_CTX mdc_tmp,*mdc;
 248         unsigned char *pp,*p;
 249         PKCS7_ISSUER_AND_SERIAL *ias;
 250         int ret=0,md_type,i;
 251         STACK *sk;
 252         BIO *btmp;
 253         X509 *x509;
 254
 255         if (!PKCS7_type_is_signed(p7)) abort();
 256         ias=si->issuer_and_serial;
 257         s=p7->d.sign;
 258
 259         x509=X509_find_by_issuer_and_serial(s->cert,ias->issuer,ias->serial);
 260
 261         /* were we able to find the cert in passed to us */
 262         if (x509 == NULL)
 263                 {
 264                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
 265                 goto err;
 266                 }
 267
 268         /* Lets verify */
 269         X509_STORE_CTX_init(ctx,cert_store,x509,s->cert);
 270         i=X509_verify_cert(ctx);
 271         if (i <= 0) goto err;
 272         X509_STORE_CTX_cleanup(ctx);
 273
 274         /* So we like 'x509', lets check the signature. */
 275         md_type=OBJ_obj2nid(si->digest_alg->algorithm);
 276
 277         btmp=bio;
 278         for (;;)
 279                 {
 280                 if ((btmp == NULL) ||
 281                         ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
 282                         {
 283                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
 284                         goto err;
 285                         }
 286                 BIO_get_md_ctx(btmp,&mdc);
 287                 if (mdc == NULL)
 288                         {
 289                         PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_INTERNAL_ERROR);
 290                         goto err;
 291                         }
 292                 if (EVP_MD_type(EVP_MD_CTX_type(mdc)) == md_type)
 293                         break;
 294                 btmp=btmp->next_bio;
 295                 }
 296
 297         /* mdc is the digest ctx that we want */
 298         memcpy(&mdc_tmp,mdc,sizeof(mdc_tmp));
 299
 300         sk=si->auth_attr;
 301         if ((sk != NULL) && (sk_num(sk) != 0))
 302                 {
 303                 i=i2d_ASN1_SET(sk,NULL,i2d_X509_ATTRIBUTE,
 304                         V_ASN1_SET,V_ASN1_UNIVERSAL);
 305                 pp=(unsigned char *)malloc(i);
 306                 p=pp;
 307                 i2d_ASN1_SET(sk,&p,i2d_X509_ATTRIBUTE,
 308                         V_ASN1_SET,V_ASN1_UNIVERSAL);
 309                 EVP_VerifyUpdate(&mdc_tmp,pp,i);
 310                 free(pp);
 311                 }
 312
 313         os=si->enc_digest;
 314         i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length,
 315                 X509_get_pubkey(x509));
 316         if (i <= 0)
 317                 {
 318                 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_SIGNATURE_FAILURE);
 319                 ret= -1;
 320                 goto err;
 321                 }
 322         else
 323                 ret=1;
 324 err:
 325         return(ret);
 326         }
 327