apps/verify.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include "apps.h"
  14 #include <openssl/bio.h>
  15 #include <openssl/err.h>
  16 #include <openssl/x509.h>
  17 #include <openssl/x509v3.h>
  18 #include <openssl/pem.h>
  19
  20 static int cb(int ok, X509_STORE_CTX *ctx);
  21 static int check(X509_STORE *ctx, const char *file,
  22                  STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
  23                  STACK_OF(X509_CRL) *crls, int show_chain);
  24 static int v_verbose = 0, vflags = 0;
  25
  26 typedef enum OPTION_choice {
  27     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  28     OPT_ENGINE, OPT_CAPATH, OPT_CAFILE, OPT_NOCAPATH, OPT_NOCAFILE,
  29     OPT_UNTRUSTED, OPT_TRUSTED, OPT_CRLFILE, OPT_CRL_DOWNLOAD, OPT_SHOW_CHAIN,
  30     OPT_V_ENUM, OPT_NAMEOPT,
  31     OPT_VERBOSE
  32 } OPTION_CHOICE;
  33
  34 const OPTIONS verify_options[] = {
  35     {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
  36     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  37     {"help", OPT_HELP, '-', "Display this summary"},
  38     {"verbose", OPT_VERBOSE, '-',
  39         "Print extra information about the operations being performed."},
  40     {"CApath", OPT_CAPATH, '/', "A directory of trusted certificates"},
  41     {"CAfile", OPT_CAFILE, '<', "A file of trusted certificates"},
  42     {"no-CAfile", OPT_NOCAFILE, '-',
  43      "Do not load the default certificates file"},
  44     {"no-CApath", OPT_NOCAPATH, '-',
  45      "Do not load certificates from the default certificates directory"},
  46     {"untrusted", OPT_UNTRUSTED, '<', "A file of untrusted certificates"},
  47     {"trusted", OPT_TRUSTED, '<', "A file of trusted certificates"},
  48     {"CRLfile", OPT_CRLFILE, '<',
  49         "File containing one or more CRL's (in PEM format) to load"},
  50     {"crl_download", OPT_CRL_DOWNLOAD, '-',
  51         "Attempt to download CRL information for this certificate"},
  52     {"show_chain", OPT_SHOW_CHAIN, '-',
  53         "Display information about the certificate chain"},
  54     {"nameopt", OPT_NAMEOPT, 's', "Various certificate name options"},
  55     OPT_V_OPTIONS,
  56 #ifndef OPENSSL_NO_ENGINE
  57     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  58 #endif
  59     {NULL}
  60 };
  61
  62 int verify_main(int argc, char **argv)
  63 {
  64     ENGINE *e = NULL;
  65     STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
  66     STACK_OF(X509_CRL) *crls = NULL;
  67     X509_STORE *store = NULL;
  68     X509_VERIFY_PARAM *vpm = NULL;
  69     const char *prog, *CApath = NULL, *CAfile = NULL;
  70     int noCApath = 0, noCAfile = 0;
  71     int vpmtouched = 0, crl_download = 0, show_chain = 0, i = 0, ret = 1;
  72     OPTION_CHOICE o;
  73
  74     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
  75         goto end;
  76
  77     prog = opt_init(argc, argv, verify_options);
  78     while ((o = opt_next()) != OPT_EOF) {
  79         switch (o) {
  80         case OPT_EOF:
  81         case OPT_ERR:
  82             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  83             goto end;
  84         case OPT_HELP:
  85             opt_help(verify_options);
  86             BIO_printf(bio_err, "Recognized usages:\n");
  87             for (i = 0; i < X509_PURPOSE_get_count(); i++) {
  88                 X509_PURPOSE *ptmp;
  89                 ptmp = X509_PURPOSE_get0(i);
  90                 BIO_printf(bio_err, "\t%-10s\t%s\n",
  91                         X509_PURPOSE_get0_sname(ptmp),
  92                         X509_PURPOSE_get0_name(ptmp));
  93             }
  94
  95             BIO_printf(bio_err, "Recognized verify names:\n");
  96             for (i = 0; i < X509_VERIFY_PARAM_get_count(); i++) {
  97                 const X509_VERIFY_PARAM *vptmp;
  98                 vptmp = X509_VERIFY_PARAM_get0(i);
  99                 BIO_printf(bio_err, "\t%-10s\n",
 100                         X509_VERIFY_PARAM_get0_name(vptmp));
 101             }
 102             ret = 0;
 103             goto end;
 104         case OPT_V_CASES:
 105             if (!opt_verify(o, vpm))
 106                 goto end;
 107             vpmtouched++;
 108             break;
 109         case OPT_CAPATH:
 110             CApath = opt_arg();
 111             break;
 112         case OPT_CAFILE:
 113             CAfile = opt_arg();
 114             break;
 115         case OPT_NOCAPATH:
 116             noCApath = 1;
 117             break;
 118         case OPT_NOCAFILE:
 119             noCAfile = 1;
 120             break;
 121         case OPT_UNTRUSTED:
 122             /* Zero or more times */
 123             if (!load_certs(opt_arg(), &untrusted, FORMAT_PEM, NULL,
 124                             "untrusted certificates"))
 125                 goto end;
 126             break;
 127         case OPT_TRUSTED:
 128             /* Zero or more times */
 129             noCAfile = 1;
 130             noCApath = 1;
 131             if (!load_certs(opt_arg(), &trusted, FORMAT_PEM, NULL,
 132                             "trusted certificates"))
 133                 goto end;
 134             break;
 135         case OPT_CRLFILE:
 136             /* Zero or more times */
 137             if (!load_crls(opt_arg(), &crls, FORMAT_PEM, NULL,
 138                            "other CRLs"))
 139                 goto end;
 140             break;
 141         case OPT_CRL_DOWNLOAD:
 142             crl_download = 1;
 143             break;
 144         case OPT_ENGINE:
 145             if ((e = setup_engine(opt_arg(), 0)) == NULL) {
 146                 /* Failure message already displayed */
 147                 goto end;
 148             }
 149             break;
 150         case OPT_SHOW_CHAIN:
 151             show_chain = 1;
 152             break;
 153         case OPT_NAMEOPT:
 154             if (!set_nameopt(opt_arg()))
 155                 goto end;
 156             break;
 157         case OPT_VERBOSE:
 158             v_verbose = 1;
 159             break;
 160         }
 161     }
 162     argc = opt_num_rest();
 163     argv = opt_rest();
 164     if (trusted != NULL && (CAfile || CApath)) {
 165         BIO_printf(bio_err,
 166                    "%s: Cannot use -trusted with -CAfile or -CApath\n",
 167                    prog);
 168         goto end;
 169     }
 170
 171     if ((store = setup_verify(CAfile, CApath, noCAfile, noCApath)) == NULL)
 172         goto end;
 173     X509_STORE_set_verify_cb(store, cb);
 174
 175     if (vpmtouched)
 176         X509_STORE_set1_param(store, vpm);
 177
 178     ERR_clear_error();
 179
 180     if (crl_download)
 181         store_setup_crl_download(store);
 182
 183     ret = 0;
 184     if (argc < 1) {
 185         if (check(store, NULL, untrusted, trusted, crls, show_chain) != 1)
 186             ret = -1;
 187     } else {
 188         for (i = 0; i < argc; i++)
 189             if (check(store, argv[i], untrusted, trusted, crls,
 190                       show_chain) != 1)
 191                 ret = -1;
 192     }
 193
 194  end:
 195     X509_VERIFY_PARAM_free(vpm);
 196     X509_STORE_free(store);
 197     sk_X509_pop_free(untrusted, X509_free);
 198     sk_X509_pop_free(trusted, X509_free);
 199     sk_X509_CRL_pop_free(crls, X509_CRL_free);
 200     release_engine(e);
 201     return (ret < 0 ? 2 : ret);
 202 }
 203
 204 static int check(X509_STORE *ctx, const char *file,
 205                  STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
 206                  STACK_OF(X509_CRL) *crls, int show_chain)
 207 {
 208     X509 *x = NULL;
 209     int i = 0, ret = 0;
 210     X509_STORE_CTX *csc;
 211     STACK_OF(X509) *chain = NULL;
 212     int num_untrusted;
 213
 214     x = load_cert(file, FORMAT_PEM, "certificate file");
 215     if (x == NULL)
 216         goto end;
 217
 218     csc = X509_STORE_CTX_new();
 219     if (csc == NULL) {
 220         printf("error %s: X.509 store context allocation failed\n",
 221                (file == NULL) ? "stdin" : file);
 222         goto end;
 223     }
 224
 225     X509_STORE_set_flags(ctx, vflags);
 226     if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) {
 227         printf("error %s: X.509 store context initialization failed\n",
 228                (file == NULL) ? "stdin" : file);
 229         goto end;
 230     }
 231     if (tchain)
 232         X509_STORE_CTX_set0_trusted_stack(csc, tchain);
 233     if (crls)
 234         X509_STORE_CTX_set0_crls(csc, crls);
 235     i = X509_verify_cert(csc);
 236     if (i > 0 && X509_STORE_CTX_get_error(csc) == X509_V_OK) {
 237         printf("%s: OK\n", (file == NULL) ? "stdin" : file);
 238         ret = 1;
 239         if (show_chain) {
 240             int j;
 241
 242             chain = X509_STORE_CTX_get1_chain(csc);
 243             num_untrusted = X509_STORE_CTX_get_num_untrusted(csc);
 244             printf("Chain:\n");
 245             for (j = 0; j < sk_X509_num(chain); j++) {
 246                 X509 *cert = sk_X509_value(chain, j);
 247                 printf("depth=%d: ", j);
 248                 X509_NAME_print_ex_fp(stdout,
 249                                       X509_get_subject_name(cert),
 250                                       0, get_nameopt());
 251                 if (j < num_untrusted)
 252                     printf(" (untrusted)");
 253                 printf("\n");
 254             }
 255             sk_X509_pop_free(chain, X509_free);
 256         }
 257     } else {
 258         printf("error %s: verification failed\n", (file == NULL) ? "stdin" : file);
 259     }
 260     X509_STORE_CTX_free(csc);
 261
 262  end:
 263     if (i <= 0)
 264         ERR_print_errors(bio_err);
 265     X509_free(x);
 266
 267     return ret;
 268 }
 269
 270 static int cb(int ok, X509_STORE_CTX *ctx)
 271 {
 272     int cert_error = X509_STORE_CTX_get_error(ctx);
 273     X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);
 274
 275     if (!ok) {
 276         if (current_cert) {
 277             X509_NAME_print_ex(bio_err,
 278                             X509_get_subject_name(current_cert),
 279                             0, get_nameopt());
 280             BIO_printf(bio_err, "\n");
 281         }
 282         BIO_printf(bio_err, "%serror %d at %d depth lookup: %s\n",
 283                X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path] " : "",
 284                cert_error,
 285                X509_STORE_CTX_get_error_depth(ctx),
 286                X509_verify_cert_error_string(cert_error));
 287         switch (cert_error) {
 288         case X509_V_ERR_NO_EXPLICIT_POLICY:
 289             policies_print(ctx);
 290             /* fall thru */
 291         case X509_V_ERR_CERT_HAS_EXPIRED:
 292
 293             /*
 294              * since we are just checking the certificates, it is ok if they
 295              * are self signed. But we should still warn the user.
 296              */
 297         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 298             /* Continue after extension errors too */
 299         case X509_V_ERR_INVALID_CA:
 300         case X509_V_ERR_INVALID_NON_CA:
 301         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 302         case X509_V_ERR_INVALID_PURPOSE:
 303         case X509_V_ERR_CRL_HAS_EXPIRED:
 304         case X509_V_ERR_CRL_NOT_YET_VALID:
 305         case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
 306             ok = 1;
 307         }
 308
 309         return ok;
 310
 311     }
 312     if (cert_error == X509_V_OK && ok == 2)
 313         policies_print(ctx);
 314     if (!v_verbose)
 315         ERR_clear_error();
 316     return (ok);
 317 }