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 <string.h> 60#include <openssl/bio.h> 61#include <openssl/asn1.h> 62#include <openssl/x509.h> 63#include <openssl/pem.h> 64#include <openssl/err.h> 65#include "example.h" 66 67int verify_callback(int ok, X509_STORE_CTX *ctx); 68 69BIO *bio_err=NULL; 70BIO *bio_out=NULL; 71 72int main(argc,argv) 73int argc; 74char *argv[]; 75 { 76 PKCS7 *p7; 77 PKCS7_SIGNER_INFO *si; 78 X509_STORE_CTX cert_ctx; 79 X509_STORE *cert_store=NULL; 80 BIO *data,*detached=NULL,*p7bio=NULL; 81 char buf[1024*4]; 82 char *pp; 83 int i,printit=0; 84 STACK_OF(PKCS7_SIGNER_INFO) *sk; 85 86 bio_err=BIO_new_fp(stderr,BIO_NOCLOSE); 87 bio_out=BIO_new_fp(stdout,BIO_NOCLOSE); 88#ifndef OPENSSL_NO_MD2 89 EVP_add_digest(EVP_md2()); 90#endif 91#ifndef OPENSSL_NO_MD5 92 EVP_add_digest(EVP_md5()); 93#endif 94#ifndef OPENSSL_NO_SHA1 95 EVP_add_digest(EVP_sha1()); 96#endif 97#ifndef OPENSSL_NO_MDC2 98 EVP_add_digest(EVP_mdc2()); 99#endif 100 101 data=BIO_new(BIO_s_file()); 102 103 pp=NULL; 104 while (argc > 1) 105 { 106 argc--; 107 argv++; 108 if (strcmp(argv[0],"-p") == 0) 109 { 110 printit=1; 111 } 112 else if ((strcmp(argv[0],"-d") == 0) && (argc >= 2)) 113 { 114 detached=BIO_new(BIO_s_file()); 115 if (!BIO_read_filename(detached,argv[1])) 116 goto err; 117 argc--; 118 argv++; 119 } 120 else 121 { 122 pp=argv[0]; 123 if (!BIO_read_filename(data,argv[0])) 124 goto err; 125 } 126 } 127 128 if (pp == NULL) 129 BIO_set_fp(data,stdin,BIO_NOCLOSE); 130 131 132 /* Load the PKCS7 object from a file */ 133 if ((p7=PEM_read_bio_PKCS7(data,NULL,NULL,NULL)) == NULL) goto err; 134 135 /* This stuff is being setup for certificate verification. 136 * When using SSL, it could be replaced with a 137 * cert_stre=SSL_CTX_get_cert_store(ssl_ctx); */ 138 cert_store=X509_STORE_new(); 139 X509_STORE_set_default_paths(cert_store); 140 X509_STORE_load_locations(cert_store,NULL,"../../certs"); 141 X509_STORE_set_verify_cb_func(cert_store,verify_callback); 142 143 ERR_clear_error(); 144 145 /* We need to process the data */ 146 if ((PKCS7_get_detached(p7) || detached)) 147 { 148 if (detached == NULL) 149 { 150 printf("no data to verify the signature on\n"); 151 exit(1); 152 } 153 else 154 p7bio=PKCS7_dataInit(p7,detached); 155 } 156 else 157 { 158 p7bio=PKCS7_dataInit(p7,NULL); 159 } 160 161 /* We now have to 'read' from p7bio to calculate digests etc. */ 162 for (;;) 163 { 164 i=BIO_read(p7bio,buf,sizeof(buf)); 165 /* print it? */ 166 if (i <= 0) break; 167 } 168 169 /* We can now verify signatures */ 170 sk=PKCS7_get_signer_info(p7); 171 if (sk == NULL) 172 { 173 printf("there are no signatures on this data\n"); 174 exit(1); 175 } 176 177 /* Ok, first we need to, for each subject entry, see if we can verify */ 178 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(sk); i++) 179 { 180 ASN1_UTCTIME *tm; 181 char *str1,*str2; 182 int rc; 183 184 si=sk_PKCS7_SIGNER_INFO_value(sk,i); 185 rc=PKCS7_dataVerify(cert_store,&cert_ctx,p7bio,p7,si); 186 if (rc <= 0) 187 goto err; 188 printf("signer info\n"); 189 if ((tm=get_signed_time(si)) != NULL) 190 { 191 BIO_printf(bio_out,"Signed time:"); 192 ASN1_UTCTIME_print(bio_out,tm); 193 ASN1_UTCTIME_free(tm); 194 BIO_printf(bio_out,"\n"); 195 } 196 if (get_signed_seq2string(si,&str1,&str2)) 197 { 198 BIO_printf(bio_out,"String 1 is %s\n",str1); 199 BIO_printf(bio_out,"String 2 is %s\n",str2); 200 } 201 202 } 203 204 X509_STORE_free(cert_store); 205 206 printf("done\n"); 207 exit(0); 208err: 209 ERR_load_crypto_strings(); 210 ERR_print_errors_fp(stderr); 211 exit(1); 212 } 213 214/* should be X509 * but we can just have them as char *. */ 215int verify_callback(int ok, X509_STORE_CTX *ctx) 216 { 217 char buf[256]; 218 X509 *err_cert; 219 int err,depth; 220 221 err_cert=X509_STORE_CTX_get_current_cert(ctx); 222 err= X509_STORE_CTX_get_error(ctx); 223 depth= X509_STORE_CTX_get_error_depth(ctx); 224 225 X509_NAME_oneline(X509_get_subject_name(err_cert),buf,256); 226 BIO_printf(bio_err,"depth=%d %s\n",depth,buf); 227 if (!ok) 228 { 229 BIO_printf(bio_err,"verify error:num=%d:%s\n",err, 230 X509_verify_cert_error_string(err)); 231 if (depth < 6) 232 { 233 ok=1; 234 X509_STORE_CTX_set_error(ctx,X509_V_OK); 235 } 236 else 237 { 238 ok=0; 239 X509_STORE_CTX_set_error(ctx,X509_V_ERR_CERT_CHAIN_TOO_LONG); 240 } 241 } 242 switch (ctx->error) 243 { 244 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: 245 X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert),buf,256); 246 BIO_printf(bio_err,"issuer= %s\n",buf); 247 break; 248 case X509_V_ERR_CERT_NOT_YET_VALID: 249 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: 250 BIO_printf(bio_err,"notBefore="); 251 ASN1_UTCTIME_print(bio_err,X509_get_notBefore(ctx->current_cert)); 252 BIO_printf(bio_err,"\n"); 253 break; 254 case X509_V_ERR_CERT_HAS_EXPIRED: 255 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: 256 BIO_printf(bio_err,"notAfter="); 257 ASN1_UTCTIME_print(bio_err,X509_get_notAfter(ctx->current_cert)); 258 BIO_printf(bio_err,"\n"); 259 break; 260 } 261 BIO_printf(bio_err,"verify return:%d\n",ok); 262 return(ok); 263 } 264