apps/verify.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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                  unsigned char *sm2id, size_t sm2idlen);
  26 static int v_verbose = 0, vflags = 0;
  27
  28 typedef enum OPTION_choice {
  29     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  30     OPT_ENGINE, OPT_CAPATH, OPT_CAFILE, OPT_CASTORE,
  31     OPT_NOCAPATH, OPT_NOCAFILE, OPT_NOCASTORE,
  32     OPT_UNTRUSTED, OPT_TRUSTED, OPT_CRLFILE, OPT_CRL_DOWNLOAD, OPT_SHOW_CHAIN,
  33     OPT_V_ENUM, OPT_NAMEOPT,
  34     OPT_VERBOSE, OPT_SM2ID, OPT_SM2HEXID
  35 } OPTION_CHOICE;
  36
  37 const OPTIONS verify_options[] = {
  38     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert...]\n"},
  39
  40     OPT_SECTION("General"),
  41     {"help", OPT_HELP, '-', "Display this summary"},
  42 #ifndef OPENSSL_NO_ENGINE
  43     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  44 #endif
  45     {"verbose", OPT_VERBOSE, '-',
  46         "Print extra information about the operations being performed."},
  47     {"nameopt", OPT_NAMEOPT, 's', "Various certificate name options"},
  48
  49     OPT_SECTION("Certificate chain"),
  50     {"CApath", OPT_CAPATH, '/', "A directory of trusted certificates"},
  51     {"CAfile", OPT_CAFILE, '<', "A file of trusted certificates"},
  52     {"CAstore", OPT_CASTORE, ':', "URI to a store of trusted certificates"},
  53     {"no-CAfile", OPT_NOCAFILE, '-',
  54      "Do not load the default certificates file"},
  55     {"no-CApath", OPT_NOCAPATH, '-',
  56      "Do not load certificates from the default certificates directory"},
  57     {"no-CAstore", OPT_NOCAPATH, '-',
  58      "Do not load certificates from the default certificates store"},
  59     {"untrusted", OPT_UNTRUSTED, '<', "A file of untrusted certificates"},
  60     {"trusted", OPT_TRUSTED, '<', "A file of trusted certificates"},
  61     {"CRLfile", OPT_CRLFILE, '<',
  62         "File containing one or more CRL's (in PEM format) to load"},
  63     {"crl_download", OPT_CRL_DOWNLOAD, '-',
  64         "Attempt to download CRL information for this certificate"},
  65     {"show_chain", OPT_SHOW_CHAIN, '-',
  66         "Display information about the certificate chain"},
  67
  68     OPT_V_OPTIONS,
  69 #ifndef OPENSSL_NO_SM2
  70     {"sm2-id", OPT_SM2ID, 's',
  71      "Specify an ID string to verify an SM2 certificate"},
  72     {"sm2-hex-id", OPT_SM2HEXID, 's',
  73      "Specify a hex ID string to verify an SM2 certificate"},
  74 #endif
  75
  76     OPT_PARAMETERS(),
  77     {"cert", 0, 0, "Certificate(s) to verify (optional; stdin used otherwise)"},
  78     {NULL}
  79 };
  80
  81 int verify_main(int argc, char **argv)
  82 {
  83     ENGINE *e = NULL;
  84     STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
  85     STACK_OF(X509_CRL) *crls = NULL;
  86     X509_STORE *store = NULL;
  87     X509_VERIFY_PARAM *vpm = NULL;
  88     const char *prog, *CApath = NULL, *CAfile = NULL, *CAstore = NULL;
  89     int noCApath = 0, noCAfile = 0, noCAstore = 0;
  90     int vpmtouched = 0, crl_download = 0, show_chain = 0, i = 0, ret = 1;
  91     OPTION_CHOICE o;
  92     unsigned char *sm2_id = NULL;
  93     size_t sm2_idlen = 0;
  94     int sm2_free = 0;
  95
  96     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
  97         goto end;
  98
  99     prog = opt_init(argc, argv, verify_options);
 100     while ((o = opt_next()) != OPT_EOF) {
 101         switch (o) {
 102         case OPT_EOF:
 103         case OPT_ERR:
 104             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 105             goto end;
 106         case OPT_HELP:
 107             opt_help(verify_options);
 108             BIO_printf(bio_err, "\nRecognized certificate chain purposes:\n");
 109             for (i = 0; i < X509_PURPOSE_get_count(); i++) {
 110                 X509_PURPOSE *ptmp = X509_PURPOSE_get0(i);
 111
 112                 BIO_printf(bio_err, "  %-15s  %s\n",
 113                         X509_PURPOSE_get0_sname(ptmp),
 114                         X509_PURPOSE_get0_name(ptmp));
 115             }
 116
 117             BIO_printf(bio_err, "Recognized certificate policy names:\n");
 118             for (i = 0; i < X509_VERIFY_PARAM_get_count(); i++) {
 119                 const X509_VERIFY_PARAM *vptmp = X509_VERIFY_PARAM_get0(i);
 120
 121                 BIO_printf(bio_err, "  %s\n",
 122                         X509_VERIFY_PARAM_get0_name(vptmp));
 123             }
 124             ret = 0;
 125             goto end;
 126         case OPT_V_CASES:
 127             if (!opt_verify(o, vpm))
 128                 goto end;
 129             vpmtouched++;
 130             break;
 131         case OPT_CAPATH:
 132             CApath = opt_arg();
 133             break;
 134         case OPT_CAFILE:
 135             CAfile = opt_arg();
 136             break;
 137         case OPT_CASTORE:
 138             CAstore = opt_arg();
 139             break;
 140         case OPT_NOCAPATH:
 141             noCApath = 1;
 142             break;
 143         case OPT_NOCAFILE:
 144             noCAfile = 1;
 145             break;
 146         case OPT_NOCASTORE:
 147             noCAstore = 1;
 148             break;
 149         case OPT_UNTRUSTED:
 150             /* Zero or more times */
 151             if (!load_certs(opt_arg(), &untrusted, FORMAT_PEM, NULL,
 152                             "untrusted certificates"))
 153                 goto end;
 154             break;
 155         case OPT_TRUSTED:
 156             /* Zero or more times */
 157             noCAfile = 1;
 158             noCApath = 1;
 159             noCAstore = 1;
 160             if (!load_certs(opt_arg(), &trusted, FORMAT_PEM, NULL,
 161                             "trusted certificates"))
 162                 goto end;
 163             break;
 164         case OPT_CRLFILE:
 165             /* Zero or more times */
 166             if (!load_crls(opt_arg(), &crls, FORMAT_PEM, NULL,
 167                            "other CRLs"))
 168                 goto end;
 169             break;
 170         case OPT_CRL_DOWNLOAD:
 171             crl_download = 1;
 172             break;
 173         case OPT_ENGINE:
 174             if ((e = setup_engine(opt_arg(), 0)) == NULL) {
 175                 /* Failure message already displayed */
 176                 goto end;
 177             }
 178             break;
 179         case OPT_SHOW_CHAIN:
 180             show_chain = 1;
 181             break;
 182         case OPT_NAMEOPT:
 183             if (!set_nameopt(opt_arg()))
 184                 goto end;
 185             break;
 186         case OPT_VERBOSE:
 187             v_verbose = 1;
 188             break;
 189         case OPT_SM2ID:
 190             if (sm2_id != NULL) {
 191                 BIO_printf(bio_err,
 192                            "Use one of the options 'sm2-hex-id' or 'sm2-id' \n");
 193                 goto end;
 194             }
 195             sm2_id = (unsigned char *)opt_arg();
 196             sm2_idlen = strlen((const char *)sm2_id);
 197             break;
 198         case OPT_SM2HEXID:
 199             if (sm2_id != NULL) {
 200                 BIO_printf(bio_err,
 201                            "Use one of the options 'sm2-hex-id' or 'sm2-id' \n");
 202                 goto end;
 203             }
 204             /* try to parse the input as hex string first */
 205             sm2_free = 1;
 206             sm2_id = OPENSSL_hexstr2buf(opt_arg(), (long *)&sm2_idlen);
 207             if (sm2_id == NULL) {
 208                 BIO_printf(bio_err, "Invalid hex string input\n");
 209                 goto end;
 210             }
 211             break;
 212         }
 213     }
 214     argc = opt_num_rest();
 215     argv = opt_rest();
 216     if (trusted != NULL
 217         && (CAfile != NULL || CApath != NULL || CAstore != NULL)) {
 218         BIO_printf(bio_err,
 219                    "%s: Cannot use -trusted with -CAfile, -CApath or -CAstore\n",
 220                    prog);
 221         goto end;
 222     }
 223
 224     if ((store = setup_verify(CAfile, noCAfile, CApath, noCApath,
 225                               CAstore, noCAstore)) == NULL)
 226         goto end;
 227     X509_STORE_set_verify_cb(store, cb);
 228
 229     if (vpmtouched)
 230         X509_STORE_set1_param(store, vpm);
 231
 232     ERR_clear_error();
 233
 234     if (crl_download)
 235         store_setup_crl_download(store);
 236
 237     ret = 0;
 238     if (argc < 1) {
 239         if (check(store, NULL, untrusted, trusted, crls, show_chain,
 240                   sm2_id, sm2_idlen) != 1)
 241             ret = -1;
 242     } else {
 243         for (i = 0; i < argc; i++)
 244             if (check(store, argv[i], untrusted, trusted, crls,
 245                       show_chain, sm2_id, sm2_idlen) != 1)
 246                 ret = -1;
 247     }
 248
 249  end:
 250     if (sm2_free)
 251         OPENSSL_free(sm2_id);
 252     X509_VERIFY_PARAM_free(vpm);
 253     X509_STORE_free(store);
 254     sk_X509_pop_free(untrusted, X509_free);
 255     sk_X509_pop_free(trusted, X509_free);
 256     sk_X509_CRL_pop_free(crls, X509_CRL_free);
 257     release_engine(e);
 258     return (ret < 0 ? 2 : ret);
 259 }
 260
 261 static int check(X509_STORE *ctx, const char *file,
 262                  STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
 263                  STACK_OF(X509_CRL) *crls, int show_chain,
 264                  unsigned char *sm2id, size_t sm2idlen)
 265 {
 266     X509 *x = NULL;
 267     int i = 0, ret = 0;
 268     X509_STORE_CTX *csc;
 269     STACK_OF(X509) *chain = NULL;
 270     int num_untrusted;
 271
 272     x = load_cert(file, FORMAT_PEM, "certificate file");
 273     if (x == NULL)
 274         goto end;
 275
 276     if (sm2id != NULL) {
 277 #ifndef OPENSSL_NO_SM2
 278         ASN1_OCTET_STRING *v;
 279
 280         v = ASN1_OCTET_STRING_new();
 281         if (v == NULL) {
 282             BIO_printf(bio_err, "error: SM2 ID allocation failed\n");
 283             goto end;
 284         }
 285
 286         if (!ASN1_OCTET_STRING_set(v, sm2id, sm2idlen)) {
 287             BIO_printf(bio_err, "error: setting SM2 ID failed\n");
 288             ASN1_OCTET_STRING_free(v);
 289             goto end;
 290         }
 291
 292         X509_set0_sm2_id(x, v);
 293 #endif
 294     }
 295
 296     csc = X509_STORE_CTX_new();
 297     if (csc == NULL) {
 298         BIO_printf(bio_err, "error %s: X.509 store context allocation failed\n",
 299                    (file == NULL) ? "stdin" : file);
 300         goto end;
 301     }
 302
 303     X509_STORE_set_flags(ctx, vflags);
 304     if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) {
 305         X509_STORE_CTX_free(csc);
 306         BIO_printf(bio_err,
 307                    "error %s: X.509 store context initialization failed\n",
 308                    (file == NULL) ? "stdin" : file);
 309         goto end;
 310     }
 311     if (tchain != NULL)
 312         X509_STORE_CTX_set0_trusted_stack(csc, tchain);
 313     if (crls != NULL)
 314         X509_STORE_CTX_set0_crls(csc, crls);
 315     i = X509_verify_cert(csc);
 316     if (i > 0 && X509_STORE_CTX_get_error(csc) == X509_V_OK) {
 317         BIO_printf(bio_out, "%s: OK\n", (file == NULL) ? "stdin" : file);
 318         ret = 1;
 319         if (show_chain) {
 320             int j;
 321
 322             chain = X509_STORE_CTX_get1_chain(csc);
 323             num_untrusted = X509_STORE_CTX_get_num_untrusted(csc);
 324             BIO_printf(bio_out, "Chain:\n");
 325             for (j = 0; j < sk_X509_num(chain); j++) {
 326                 X509 *cert = sk_X509_value(chain, j);
 327                 BIO_printf(bio_out, "depth=%d: ", j);
 328                 X509_NAME_print_ex_fp(stdout,
 329                                       X509_get_subject_name(cert),
 330                                       0, get_nameopt());
 331                 if (j < num_untrusted)
 332                     BIO_printf(bio_out, " (untrusted)");
 333                 BIO_printf(bio_out, "\n");
 334             }
 335             sk_X509_pop_free(chain, X509_free);
 336         }
 337     } else {
 338         BIO_printf(bio_err,
 339                    "error %s: verification failed\n",
 340                    (file == NULL) ? "stdin" : file);
 341     }
 342     X509_STORE_CTX_free(csc);
 343
 344  end:
 345     if (i <= 0)
 346         ERR_print_errors(bio_err);
 347     X509_free(x);
 348
 349     return ret;
 350 }
 351
 352 static int cb(int ok, X509_STORE_CTX *ctx)
 353 {
 354     int cert_error = X509_STORE_CTX_get_error(ctx);
 355     X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);
 356
 357     if (!ok) {
 358         if (current_cert != NULL) {
 359             X509_NAME_print_ex(bio_err,
 360                             X509_get_subject_name(current_cert),
 361                             0, get_nameopt());
 362             BIO_printf(bio_err, "\n");
 363         }
 364         BIO_printf(bio_err, "%serror %d at %d depth lookup: %s\n",
 365                X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path] " : "",
 366                cert_error,
 367                X509_STORE_CTX_get_error_depth(ctx),
 368                X509_verify_cert_error_string(cert_error));
 369
 370         /*
 371          * Pretend that some errors are ok, so they don't stop further
 372          * processing of the certificate chain.  Setting ok = 1 does this.
 373          * After X509_verify_cert() is done, we verify that there were
 374          * no actual errors, even if the returned value was positive.
 375          */
 376         switch (cert_error) {
 377         case X509_V_ERR_NO_EXPLICIT_POLICY:
 378             policies_print(ctx);
 379             /* fall thru */
 380         case X509_V_ERR_CERT_HAS_EXPIRED:
 381             /* Continue even if the leaf is a self signed cert */
 382         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 383             /* Continue after extension errors too */
 384         case X509_V_ERR_INVALID_CA:
 385         case X509_V_ERR_INVALID_NON_CA:
 386         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 387         case X509_V_ERR_INVALID_PURPOSE:
 388         case X509_V_ERR_CRL_HAS_EXPIRED:
 389         case X509_V_ERR_CRL_NOT_YET_VALID:
 390         case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
 391             ok = 1;
 392         }
 393
 394         return ok;
 395
 396     }
 397     if (cert_error == X509_V_OK && ok == 2)
 398         policies_print(ctx);
 399     if (!v_verbose)
 400         ERR_clear_error();
 401     return ok;
 402 }