crypto/openssl-0.9.7e/crypto/pkcs7/dec.c

   1 /* crypto/pkcs7/verify.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 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <openssl/bio.h>
  62 #include <openssl/x509.h>
  63 #include <openssl/pem.h>
  64 #include <openssl/err.h>
  65 #include <openssl/asn1.h>
  66
  67 int verify_callback(int ok, X509_STORE_CTX *ctx);
  68
  69 BIO *bio_err=NULL;
  70
  71 int main(argc,argv)
  72 int argc;
  73 char *argv[];
  74         {
  75         char *keyfile=NULL;
  76         BIO *in;
  77         EVP_PKEY *pkey;
  78         X509 *x509;
  79         PKCS7 *p7;
  80         PKCS7_SIGNER_INFO *si;
  81         X509_STORE_CTX cert_ctx;
  82         X509_STORE *cert_store=NULL;
  83         BIO *data,*detached=NULL,*p7bio=NULL;
  84         char buf[1024*4];
  85         unsigned char *pp;
  86         int i,printit=0;
  87         STACK_OF(PKCS7_SIGNER_INFO) *sk;
  88
  89         OpenSSL_add_all_algorithms();
  90         bio_err=BIO_new_fp(stderr,BIO_NOCLOSE);
  91
  92         data=BIO_new(BIO_s_file());
  93         pp=NULL;
  94         while (argc > 1)
  95                 {
  96                 argc--;
  97                 argv++;
  98                 if (strcmp(argv[0],"-p") == 0)
  99                         {
 100                         printit=1;
 101                         }
 102                 else if ((strcmp(argv[0],"-k") == 0) && (argc >= 2)) {
 103                         keyfile = argv[1];
 104                         argc-=1;
 105                         argv+=1;
 106                 } else if ((strcmp(argv[0],"-d") == 0) && (argc >= 2))
 107                         {
 108                         detached=BIO_new(BIO_s_file());
 109                         if (!BIO_read_filename(detached,argv[1]))
 110                                 goto err;
 111                         argc-=1;
 112                         argv+=1;
 113                         }
 114                 else break;
 115                 }
 116
 117          if (!BIO_read_filename(data,argv[0])) goto err;
 118
 119         if(!keyfile) {
 120                 fprintf(stderr, "No private key file specified\n");
 121                 goto err;
 122         }
 123
 124         if ((in=BIO_new_file(keyfile,"r")) == NULL) goto err;
 125         if ((x509=PEM_read_bio_X509(in,NULL,NULL,NULL)) == NULL) goto err;
 126         BIO_reset(in);
 127         if ((pkey=PEM_read_bio_PrivateKey(in,NULL,NULL,NULL)) == NULL)
 128                 goto err;
 129         BIO_free(in);
 130
 131         if (pp == NULL)
 132                 BIO_set_fp(data,stdin,BIO_NOCLOSE);
 133
 134
 135         /* Load the PKCS7 object from a file */
 136         if ((p7=PEM_read_bio_PKCS7(data,NULL,NULL,NULL)) == NULL) goto err;
 137
 138
 139
 140         /* This stuff is being setup for certificate verification.
 141          * When using SSL, it could be replaced with a
 142          * cert_stre=SSL_CTX_get_cert_store(ssl_ctx); */
 143         cert_store=X509_STORE_new();
 144         X509_STORE_set_default_paths(cert_store);
 145         X509_STORE_load_locations(cert_store,NULL,"../../certs");
 146         X509_STORE_set_verify_cb_func(cert_store,verify_callback);
 147
 148         ERR_clear_error();
 149
 150         /* We need to process the data */
 151         /* We cannot support detached encryption */
 152         p7bio=PKCS7_dataDecode(p7,pkey,detached,x509);
 153
 154         if (p7bio == NULL)
 155                 {
 156                 printf("problems decoding\n");
 157                 goto err;
 158                 }
 159
 160         /* We now have to 'read' from p7bio to calculate digests etc. */
 161         for (;;)
 162                 {
 163                 i=BIO_read(p7bio,buf,sizeof(buf));
 164                 /* print it? */
 165                 if (i <= 0) break;
 166                 fwrite(buf,1, i, stdout);
 167                 }
 168
 169         /* We can now verify signatures */
 170         sk=PKCS7_get_signer_info(p7);
 171         if (sk == NULL)
 172                 {
 173                 fprintf(stderr, "there are no signatures on this data\n");
 174                 }
 175         else
 176                 {
 177                 /* Ok, first we need to, for each subject entry,
 178                  * see if we can verify */
 179                 ERR_clear_error();
 180                 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sk); i++)
 181                         {
 182                         si=sk_PKCS7_SIGNER_INFO_value(sk,i);
 183                         i=PKCS7_dataVerify(cert_store,&cert_ctx,p7bio,p7,si);
 184                         if (i <= 0)
 185                                 goto err;
 186                         else
 187                                 fprintf(stderr,"Signature verified\n");
 188                         }
 189                 }
 190         X509_STORE_free(cert_store);
 191
 192         exit(0);
 193 err:
 194         ERR_load_crypto_strings();
 195         ERR_print_errors_fp(stderr);
 196         exit(1);
 197         }
 198
 199 /* should be X509 * but we can just have them as char *. */
 200 int verify_callback(int ok, X509_STORE_CTX *ctx)
 201         {
 202         char buf[256];
 203         X509 *err_cert;
 204         int err,depth;
 205
 206         err_cert=X509_STORE_CTX_get_current_cert(ctx);
 207         err=    X509_STORE_CTX_get_error(ctx);
 208         depth=  X509_STORE_CTX_get_error_depth(ctx);
 209
 210         X509_NAME_oneline(X509_get_subject_name(err_cert),buf,256);
 211         BIO_printf(bio_err,"depth=%d %s\n",depth,buf);
 212         if (!ok)
 213                 {
 214                 BIO_printf(bio_err,"verify error:num=%d:%s\n",err,
 215                         X509_verify_cert_error_string(err));
 216                 if (depth < 6)
 217                         {
 218                         ok=1;
 219                         X509_STORE_CTX_set_error(ctx,X509_V_OK);
 220                         }
 221                 else
 222                         {
 223                         ok=0;
 224                         X509_STORE_CTX_set_error(ctx,X509_V_ERR_CERT_CHAIN_TOO_LONG);
 225                         }
 226                 }
 227         switch (ctx->error)
 228                 {
 229         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
 230                 X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert),buf,256);
 231                 BIO_printf(bio_err,"issuer= %s\n",buf);
 232                 break;
 233         case X509_V_ERR_CERT_NOT_YET_VALID:
 234         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
 235                 BIO_printf(bio_err,"notBefore=");
 236                 ASN1_UTCTIME_print(bio_err,X509_get_notBefore(ctx->current_cert));
 237                 BIO_printf(bio_err,"\n");
 238                 break;
 239         case X509_V_ERR_CERT_HAS_EXPIRED:
 240         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 241                 BIO_printf(bio_err,"notAfter=");
 242                 ASN1_UTCTIME_print(bio_err,X509_get_notAfter(ctx->current_cert));
 243                 BIO_printf(bio_err,"\n");
 244                 break;
 245                 }
 246         BIO_printf(bio_err,"verify return:%d\n",ok);
 247         return(ok);
 248         }