Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |
| 67 | int verify_callback(int ok, X509_STORE_CTX *ctx); |
| 68 | |
| 69 | BIO *bio_err=NULL; |
| 70 | BIO *bio_out=NULL; |
| 71 | |
| 72 | int main(argc,argv) |
| 73 | int argc; |
| 74 | char *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); |
| 208 | err: |
| 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 *. */ |
| 215 | int 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 | } |