apps/verify.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include "apps.h"
  62 #include <openssl/bio.h>
  63 #include <openssl/err.h>
  64 #include <openssl/x509.h>
  65 #include <openssl/x509v3.h>
  66 #include <openssl/pem.h>
  67
  68 static int cb(int ok, X509_STORE_CTX *ctx);
  69 static int check(X509_STORE *ctx, char *file,
  70                  STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
  71                  STACK_OF(X509_CRL) *crls, ENGINE *e, int show_chain);
  72 static int v_verbose = 0, vflags = 0;
  73
  74 typedef enum OPTION_choice {
  75     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  76     OPT_ENGINE, OPT_CAPATH, OPT_CAFILE, OPT_NOCAPATH, OPT_NOCAFILE,
  77     OPT_UNTRUSTED, OPT_TRUSTED, OPT_CRLFILE, OPT_CRL_DOWNLOAD, OPT_SHOW_CHAIN,
  78     OPT_V_ENUM,
  79     OPT_VERBOSE
  80 } OPTION_CHOICE;
  81
  82 OPTIONS verify_options[] = {
  83     {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
  84     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  85     {"help", OPT_HELP, '-', "Display this summary"},
  86     {"verbose", OPT_VERBOSE, '-',
  87         "Print extra information about the operations being performed."},
  88     {"CApath", OPT_CAPATH, '/', "A directory of trusted certificates"},
  89     {"CAfile", OPT_CAFILE, '<', "A file of trusted certificates"},
  90     {"no-CAfile", OPT_NOCAFILE, '-',
  91      "Do not load the default certificates file"},
  92     {"no-CApath", OPT_NOCAPATH, '-',
  93      "Do not load certificates from the default certificates directory"},
  94     {"untrusted", OPT_UNTRUSTED, '<', "A file of untrusted certificates"},
  95     {"trusted", OPT_TRUSTED, '<', "A file of trusted certificates"},
  96     {"CRLfile", OPT_CRLFILE, '<',
  97         "File containing one or more CRL's (in PEM format) to load"},
  98     {"crl_download", OPT_CRL_DOWNLOAD, '-',
  99         "Attempt to download CRL information for this certificate"},
 100     {"show_chain", OPT_SHOW_CHAIN, '-',
 101         "Display information about the certificate chain"},
 102     OPT_V_OPTIONS,
 103 #ifndef OPENSSL_NO_ENGINE
 104     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 105 #endif
 106     {NULL}
 107 };
 108
 109 int verify_main(int argc, char **argv)
 110 {
 111     ENGINE *e = NULL;
 112     STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
 113     STACK_OF(X509_CRL) *crls = NULL;
 114     X509_STORE *store = NULL;
 115     X509_VERIFY_PARAM *vpm = NULL;
 116     char *prog, *CApath = NULL, *CAfile = NULL;
 117     int noCApath = 0, noCAfile = 0;
 118     char *untfile = NULL, *trustfile = NULL, *crlfile = NULL;
 119     int vpmtouched = 0, crl_download = 0, show_chain = 0, i = 0, ret = 1;
 120     OPTION_CHOICE o;
 121
 122     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
 123         goto end;
 124
 125     prog = opt_init(argc, argv, verify_options);
 126     while ((o = opt_next()) != OPT_EOF) {
 127         switch (o) {
 128         case OPT_EOF:
 129         case OPT_ERR:
 130             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 131             goto end;
 132         case OPT_HELP:
 133             opt_help(verify_options);
 134             BIO_printf(bio_err, "Recognized usages:\n");
 135             for (i = 0; i < X509_PURPOSE_get_count(); i++) {
 136                 X509_PURPOSE *ptmp;
 137                 ptmp = X509_PURPOSE_get0(i);
 138                 BIO_printf(bio_err, "\t%-10s\t%s\n",
 139                         X509_PURPOSE_get0_sname(ptmp),
 140                         X509_PURPOSE_get0_name(ptmp));
 141             }
 142
 143             BIO_printf(bio_err, "Recognized verify names:\n");
 144             for (i = 0; i < X509_VERIFY_PARAM_get_count(); i++) {
 145                 const X509_VERIFY_PARAM *vptmp;
 146                 vptmp = X509_VERIFY_PARAM_get0(i);
 147                 BIO_printf(bio_err, "\t%-10s\n",
 148                         X509_VERIFY_PARAM_get0_name(vptmp));
 149             }
 150             ret = 0;
 151             goto end;
 152         case OPT_V_CASES:
 153             if (!opt_verify(o, vpm))
 154                 goto end;
 155             vpmtouched++;
 156             break;
 157         case OPT_CAPATH:
 158             CApath = opt_arg();
 159             break;
 160         case OPT_CAFILE:
 161             CAfile = opt_arg();
 162             break;
 163         case OPT_NOCAPATH:
 164             noCApath = 1;
 165             break;
 166         case OPT_NOCAFILE:
 167             noCAfile = 1;
 168             break;
 169         case OPT_UNTRUSTED:
 170             untfile = opt_arg();
 171             break;
 172         case OPT_TRUSTED:
 173             trustfile = opt_arg();
 174             break;
 175         case OPT_CRLFILE:
 176             crlfile = opt_arg();
 177             break;
 178         case OPT_CRL_DOWNLOAD:
 179             crl_download = 1;
 180             break;
 181         case OPT_SHOW_CHAIN:
 182             show_chain = 1;
 183             break;
 184         case OPT_ENGINE:
 185             e = setup_engine(opt_arg(), 0);
 186             break;
 187         case OPT_VERBOSE:
 188             v_verbose = 1;
 189             break;
 190         }
 191     }
 192     argc = opt_num_rest();
 193     argv = opt_rest();
 194     if (trustfile && (CAfile || CApath)) {
 195         BIO_printf(bio_err,
 196                    "%s: Cannot use -trusted with -CAfile or -CApath\n",
 197                    prog);
 198         goto end;
 199     }
 200
 201     if ((store = setup_verify(CAfile, CApath, noCAfile, noCApath)) == NULL)
 202         goto end;
 203     X509_STORE_set_verify_cb(store, cb);
 204
 205     if (vpmtouched)
 206         X509_STORE_set1_param(store, vpm);
 207
 208     ERR_clear_error();
 209
 210     if (untfile) {
 211         if (!load_certs(untfile, &untrusted, FORMAT_PEM, NULL, e,
 212                         "untrusted certificates"))
 213             goto end;
 214     }
 215
 216     if (trustfile) {
 217         if (!load_certs(trustfile, &trusted, FORMAT_PEM, NULL, e,
 218                         "trusted certificates"))
 219             goto end;
 220     }
 221
 222     if (crlfile) {
 223         if (!load_crls(crlfile, &crls, FORMAT_PEM, NULL, e, "other CRLs"))
 224             goto end;
 225     }
 226
 227     if (crl_download)
 228         store_setup_crl_download(store);
 229
 230     ret = 0;
 231     if (argc < 1) {
 232         if (check(store, NULL, untrusted, trusted, crls, e, show_chain) != 1)
 233             ret = -1;
 234     } else {
 235         for (i = 0; i < argc; i++)
 236             if (check(store, argv[i], untrusted, trusted, crls, e,
 237                       show_chain) != 1)
 238                 ret = -1;
 239     }
 240
 241  end:
 242     X509_VERIFY_PARAM_free(vpm);
 243     X509_STORE_free(store);
 244     sk_X509_pop_free(untrusted, X509_free);
 245     sk_X509_pop_free(trusted, X509_free);
 246     sk_X509_CRL_pop_free(crls, X509_CRL_free);
 247     return (ret < 0 ? 2 : ret);
 248 }
 249
 250 static int check(X509_STORE *ctx, char *file,
 251                  STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
 252                  STACK_OF(X509_CRL) *crls, ENGINE *e, int show_chain)
 253 {
 254     X509 *x = NULL;
 255     int i = 0, ret = 0;
 256     X509_STORE_CTX *csc;
 257     STACK_OF(X509) *chain = NULL;
 258     int num_untrusted;
 259
 260     x = load_cert(file, FORMAT_PEM, NULL, e, "certificate file");
 261     if (x == NULL)
 262         goto end;
 263
 264     csc = X509_STORE_CTX_new();
 265     if (csc == NULL) {
 266         printf("error %s: X.509 store context allocation failed\n",
 267                (file == NULL) ? "stdin" : file);
 268         goto end;
 269     }
 270     X509_STORE_set_flags(ctx, vflags);
 271     if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) {
 272         printf("error %s: X.509 store context initialization failed\n",
 273                (file == NULL) ? "stdin" : file);
 274         goto end;
 275     }
 276     if (tchain)
 277         X509_STORE_CTX_trusted_stack(csc, tchain);
 278     if (crls)
 279         X509_STORE_CTX_set0_crls(csc, crls);
 280     i = X509_verify_cert(csc);
 281     if (i > 0 && X509_STORE_CTX_get_error(csc) == X509_V_OK) {
 282         printf("%s: OK\n", (file == NULL) ? "stdin" : file);
 283         ret = 1;
 284         if (show_chain) {
 285             int j;
 286
 287             chain = X509_STORE_CTX_get1_chain(csc);
 288             num_untrusted = X509_STORE_CTX_get_num_untrusted(csc);
 289             printf("Chain:\n");
 290             for (j = 0; j < sk_X509_num(chain); j++) {
 291                 X509 *cert = sk_X509_value(chain, j);
 292                 printf("depth=%d: ", j);
 293                 X509_NAME_print_ex_fp(stdout,
 294                                       X509_get_subject_name(cert),
 295                                       0, XN_FLAG_ONELINE);
 296                 if (j < num_untrusted)
 297                     printf(" (untrusted)");
 298                 printf("\n");
 299             }
 300             sk_X509_pop_free(chain, X509_free);
 301         }
 302     } else {
 303         printf("error %s: verification failed\n", (file == NULL) ? "stdin" : file);
 304     }
 305     X509_STORE_CTX_free(csc);
 306
 307  end:
 308     if (i <= 0)
 309         ERR_print_errors(bio_err);
 310     X509_free(x);
 311
 312     return ret;
 313 }
 314
 315 static int cb(int ok, X509_STORE_CTX *ctx)
 316 {
 317     int cert_error = X509_STORE_CTX_get_error(ctx);
 318     X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);
 319
 320     if (!ok) {
 321         if (current_cert) {
 322             X509_NAME_print_ex(bio_err,
 323                             X509_get_subject_name(current_cert),
 324                             0, XN_FLAG_ONELINE);
 325             BIO_printf(bio_err, "\n");
 326         }
 327         BIO_printf(bio_err, "%serror %d at %d depth lookup: %s\n",
 328                X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path] " : "",
 329                cert_error,
 330                X509_STORE_CTX_get_error_depth(ctx),
 331                X509_verify_cert_error_string(cert_error));
 332         switch (cert_error) {
 333         case X509_V_ERR_NO_EXPLICIT_POLICY:
 334             policies_print(ctx);
 335         case X509_V_ERR_CERT_HAS_EXPIRED:
 336
 337             /*
 338              * since we are just checking the certificates, it is ok if they
 339              * are self signed. But we should still warn the user.
 340              */
 341         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 342             /* Continue after extension errors too */
 343         case X509_V_ERR_INVALID_CA:
 344         case X509_V_ERR_INVALID_NON_CA:
 345         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 346         case X509_V_ERR_INVALID_PURPOSE:
 347         case X509_V_ERR_CRL_HAS_EXPIRED:
 348         case X509_V_ERR_CRL_NOT_YET_VALID:
 349         case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
 350             ok = 1;
 351         }
 352
 353         return ok;
 354
 355     }
 356     if (cert_error == X509_V_OK && ok == 2)
 357         policies_print(ctx);
 358     if (!v_verbose)
 359         ERR_clear_error();
 360     return (ok);
 361 }