apps/verify.c

   1 /*
   2  * Copyright 1995-2018 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 "progs.h"
  15 #include <openssl/bio.h>
  16 #include <openssl/err.h>
  17 #include <openssl/x509.h>
  18 #include <openssl/x509v3.h>
  19 #include <openssl/pem.h>
  20
  21 static int cb(int ok, X509_STORE_CTX *ctx);
  22 static int check(X509_STORE *ctx, const char *file,
  23                  STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
  24                  STACK_OF(X509_CRL) *crls, int show_chain);
  25 static int v_verbose = 0, vflags = 0;
  26
  27 typedef enum OPTION_choice {
  28     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  29     OPT_ENGINE, OPT_CAPATH, OPT_CAFILE, OPT_NOCAPATH, OPT_NOCAFILE,
  30     OPT_UNTRUSTED, OPT_TRUSTED, OPT_CRLFILE, OPT_CRL_DOWNLOAD, OPT_SHOW_CHAIN,
  31     OPT_V_ENUM, OPT_NAMEOPT,
  32     OPT_VERBOSE
  33 } OPTION_CHOICE;
  34
  35 const OPTIONS verify_options[] = {
  36     {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
  37     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
  38     {"help", OPT_HELP, '-', "Display this summary"},
  39     {"verbose", OPT_VERBOSE, '-',
  40         "Print extra information about the operations being performed."},
  41     {"CApath", OPT_CAPATH, '/', "A directory of trusted certificates"},
  42     {"CAfile", OPT_CAFILE, '<', "A file of trusted certificates"},
  43     {"no-CAfile", OPT_NOCAFILE, '-',
  44      "Do not load the default certificates file"},
  45     {"no-CApath", OPT_NOCAPATH, '-',
  46      "Do not load certificates from the default certificates directory"},
  47     {"untrusted", OPT_UNTRUSTED, '<', "A file of untrusted certificates"},
  48     {"trusted", OPT_TRUSTED, '<', "A file of trusted certificates"},
  49     {"CRLfile", OPT_CRLFILE, '<',
  50         "File containing one or more CRL's (in PEM format) to load"},
  51     {"crl_download", OPT_CRL_DOWNLOAD, '-',
  52         "Attempt to download CRL information for this certificate"},
  53     {"show_chain", OPT_SHOW_CHAIN, '-',
  54         "Display information about the certificate chain"},
  55     {"nameopt", OPT_NAMEOPT, 's', "Various certificate name options"},
  56     OPT_V_OPTIONS,
  57 #ifndef OPENSSL_NO_ENGINE
  58     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  59 #endif
  60     {NULL}
  61 };
  62
  63 int verify_main(int argc, char **argv)
  64 {
  65     ENGINE *e = NULL;
  66     STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
  67     STACK_OF(X509_CRL) *crls = NULL;
  68     X509_STORE *store = NULL;
  69     X509_VERIFY_PARAM *vpm = NULL;
  70     const char *prog, *CApath = NULL, *CAfile = NULL;
  71     int noCApath = 0, noCAfile = 0;
  72     int vpmtouched = 0, crl_download = 0, show_chain = 0, i = 0, ret = 1;
  73     OPTION_CHOICE o;
  74
  75     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
  76         goto end;
  77
  78     prog = opt_init(argc, argv, verify_options);
  79     while ((o = opt_next()) != OPT_EOF) {
  80         switch (o) {
  81         case OPT_EOF:
  82         case OPT_ERR:
  83             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
  84             goto end;
  85         case OPT_HELP:
  86             opt_help(verify_options);
  87             BIO_printf(bio_err, "Recognized usages:\n");
  88             for (i = 0; i < X509_PURPOSE_get_count(); i++) {
  89                 X509_PURPOSE *ptmp;
  90                 ptmp = X509_PURPOSE_get0(i);
  91                 BIO_printf(bio_err, "\t%-10s\t%s\n",
  92                         X509_PURPOSE_get0_sname(ptmp),
  93                         X509_PURPOSE_get0_name(ptmp));
  94             }
  95
  96             BIO_printf(bio_err, "Recognized verify names:\n");
  97             for (i = 0; i < X509_VERIFY_PARAM_get_count(); i++) {
  98                 const X509_VERIFY_PARAM *vptmp;
  99                 vptmp = X509_VERIFY_PARAM_get0(i);
 100                 BIO_printf(bio_err, "\t%-10s\n",
 101                         X509_VERIFY_PARAM_get0_name(vptmp));
 102             }
 103             ret = 0;
 104             goto end;
 105         case OPT_V_CASES:
 106             if (!opt_verify(o, vpm))
 107                 goto end;
 108             vpmtouched++;
 109             break;
 110         case OPT_CAPATH:
 111             CApath = opt_arg();
 112             break;
 113         case OPT_CAFILE:
 114             CAfile = opt_arg();
 115             break;
 116         case OPT_NOCAPATH:
 117             noCApath = 1;
 118             break;
 119         case OPT_NOCAFILE:
 120             noCAfile = 1;
 121             break;
 122         case OPT_UNTRUSTED:
 123             /* Zero or more times */
 124             if (!load_certs(opt_arg(), &untrusted, FORMAT_PEM, NULL,
 125                             "untrusted certificates"))
 126                 goto end;
 127             break;
 128         case OPT_TRUSTED:
 129             /* Zero or more times */
 130             noCAfile = 1;
 131             noCApath = 1;
 132             if (!load_certs(opt_arg(), &trusted, FORMAT_PEM, NULL,
 133                             "trusted certificates"))
 134                 goto end;
 135             break;
 136         case OPT_CRLFILE:
 137             /* Zero or more times */
 138             if (!load_crls(opt_arg(), &crls, FORMAT_PEM, NULL,
 139                            "other CRLs"))
 140                 goto end;
 141             break;
 142         case OPT_CRL_DOWNLOAD:
 143             crl_download = 1;
 144             break;
 145         case OPT_ENGINE:
 146             if ((e = setup_engine(opt_arg(), 0)) == NULL) {
 147                 /* Failure message already displayed */
 148                 goto end;
 149             }
 150             break;
 151         case OPT_SHOW_CHAIN:
 152             show_chain = 1;
 153             break;
 154         case OPT_NAMEOPT:
 155             if (!set_nameopt(opt_arg()))
 156                 goto end;
 157             break;
 158         case OPT_VERBOSE:
 159             v_verbose = 1;
 160             break;
 161         }
 162     }
 163     argc = opt_num_rest();
 164     argv = opt_rest();
 165     if (trusted != NULL && (CAfile || CApath)) {
 166         BIO_printf(bio_err,
 167                    "%s: Cannot use -trusted with -CAfile or -CApath\n",
 168                    prog);
 169         goto end;
 170     }
 171
 172     if ((store = setup_verify(CAfile, CApath, noCAfile, noCApath)) == NULL)
 173         goto end;
 174     X509_STORE_set_verify_cb(store, cb);
 175
 176     if (vpmtouched)
 177         X509_STORE_set1_param(store, vpm);
 178
 179     ERR_clear_error();
 180
 181     if (crl_download)
 182         store_setup_crl_download(store);
 183
 184     ret = 0;
 185     if (argc < 1) {
 186         if (check(store, NULL, untrusted, trusted, crls, show_chain) != 1)
 187             ret = -1;
 188     } else {
 189         for (i = 0; i < argc; i++)
 190             if (check(store, argv[i], untrusted, trusted, crls,
 191                       show_chain) != 1)
 192                 ret = -1;
 193     }
 194
 195  end:
 196     X509_VERIFY_PARAM_free(vpm);
 197     X509_STORE_free(store);
 198     sk_X509_pop_free(untrusted, X509_free);
 199     sk_X509_pop_free(trusted, X509_free);
 200     sk_X509_CRL_pop_free(crls, X509_CRL_free);
 201     release_engine(e);
 202     return (ret < 0 ? 2 : ret);
 203 }
 204
 205 static int check(X509_STORE *ctx, const char *file,
 206                  STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
 207                  STACK_OF(X509_CRL) *crls, int show_chain)
 208 {
 209     X509 *x = NULL;
 210     int i = 0, ret = 0;
 211     X509_STORE_CTX *csc;
 212     STACK_OF(X509) *chain = NULL;
 213     int num_untrusted;
 214
 215     x = load_cert(file, FORMAT_PEM, "certificate file");
 216     if (x == NULL)
 217         goto end;
 218
 219     csc = X509_STORE_CTX_new();
 220     if (csc == NULL) {
 221         printf("error %s: X.509 store context allocation failed\n",
 222                (file == NULL) ? "stdin" : file);
 223         goto end;
 224     }
 225
 226     X509_STORE_set_flags(ctx, vflags);
 227     if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) {
 228         printf("error %s: X.509 store context initialization failed\n",
 229                (file == NULL) ? "stdin" : file);
 230         goto end;
 231     }
 232     if (tchain != NULL)
 233         X509_STORE_CTX_set0_trusted_stack(csc, tchain);
 234     if (crls != NULL)
 235         X509_STORE_CTX_set0_crls(csc, crls);
 236     i = X509_verify_cert(csc);
 237     if (i > 0 && X509_STORE_CTX_get_error(csc) == X509_V_OK) {
 238         printf("%s: OK\n", (file == NULL) ? "stdin" : file);
 239         ret = 1;
 240         if (show_chain) {
 241             int j;
 242
 243             chain = X509_STORE_CTX_get1_chain(csc);
 244             num_untrusted = X509_STORE_CTX_get_num_untrusted(csc);
 245             printf("Chain:\n");
 246             for (j = 0; j < sk_X509_num(chain); j++) {
 247                 X509 *cert = sk_X509_value(chain, j);
 248                 printf("depth=%d: ", j);
 249                 X509_NAME_print_ex_fp(stdout,
 250                                       X509_get_subject_name(cert),
 251                                       0, get_nameopt());
 252                 if (j < num_untrusted)
 253                     printf(" (untrusted)");
 254                 printf("\n");
 255             }
 256             sk_X509_pop_free(chain, X509_free);
 257         }
 258     } else {
 259         printf("error %s: verification failed\n", (file == NULL) ? "stdin" : file);
 260     }
 261     X509_STORE_CTX_free(csc);
 262
 263  end:
 264     if (i <= 0)
 265         ERR_print_errors(bio_err);
 266     X509_free(x);
 267
 268     return ret;
 269 }
 270
 271 static int cb(int ok, X509_STORE_CTX *ctx)
 272 {
 273     int cert_error = X509_STORE_CTX_get_error(ctx);
 274     X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);
 275
 276     if (!ok) {
 277         if (current_cert != NULL) {
 278             X509_NAME_print_ex(bio_err,
 279                             X509_get_subject_name(current_cert),
 280                             0, get_nameopt());
 281             BIO_printf(bio_err, "\n");
 282         }
 283         BIO_printf(bio_err, "%serror %d at %d depth lookup: %s\n",
 284                X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path] " : "",
 285                cert_error,
 286                X509_STORE_CTX_get_error_depth(ctx),
 287                X509_verify_cert_error_string(cert_error));
 288         switch (cert_error) {
 289         case X509_V_ERR_NO_EXPLICIT_POLICY:
 290             policies_print(ctx);
 291             /* fall thru */
 292         case X509_V_ERR_CERT_HAS_EXPIRED:
 293
 294             /*
 295              * since we are just checking the certificates, it is ok if they
 296              * are self signed. But we should still warn the user.
 297              */
 298         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 299             /* Continue after extension errors too */
 300         case X509_V_ERR_INVALID_CA:
 301         case X509_V_ERR_INVALID_NON_CA:
 302         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 303         case X509_V_ERR_INVALID_PURPOSE:
 304         case X509_V_ERR_CRL_HAS_EXPIRED:
 305         case X509_V_ERR_CRL_NOT_YET_VALID:
 306         case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
 307             ok = 1;
 308         }
 309
 310         return ok;
 311
 312     }
 313     if (cert_error == X509_V_OK && ok == 2)
 314         policies_print(ctx);
 315     if (!v_verbose)
 316         ERR_clear_error();
 317     return ok;
 318 }