apps/verify.c

   1 /*
   2  * Copyright 1995-2020 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                  STACK_OF(OPENSSL_STRING) *opts);
  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, OPT_VFYOPT,
  34     OPT_VERBOSE,
  35     OPT_PROV_ENUM
  36 } OPTION_CHOICE;
  37
  38 const OPTIONS verify_options[] = {
  39     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [cert...]\n"},
  40
  41     OPT_SECTION("General"),
  42     {"help", OPT_HELP, '-', "Display this summary"},
  43 #ifndef OPENSSL_NO_ENGINE
  44     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  45 #endif
  46     {"verbose", OPT_VERBOSE, '-',
  47         "Print extra information about the operations being performed."},
  48     {"nameopt", OPT_NAMEOPT, 's', "Certificate subject/issuer name printing options"},
  49
  50     OPT_SECTION("Certificate chain"),
  51     {"trusted", OPT_TRUSTED, '<', "A file of trusted certificates"},
  52     {"CAfile", OPT_CAFILE, '<', "A file of trusted certificates"},
  53     {"CApath", OPT_CAPATH, '/', "A directory of files with trusted certificates"},
  54     {"CAstore", OPT_CASTORE, ':', "URI to a store of trusted certificates"},
  55     {"no-CAfile", OPT_NOCAFILE, '-',
  56      "Do not load the default trusted certificates file"},
  57     {"no-CApath", OPT_NOCAPATH, '-',
  58      "Do not load trusted certificates from the default directory"},
  59     {"no-CAstore", OPT_NOCASTORE, '-',
  60      "Do not load trusted certificates from the default certificates store"},
  61     {"untrusted", OPT_UNTRUSTED, '<', "A file of untrusted certificates"},
  62     {"CRLfile", OPT_CRLFILE, '<',
  63         "File containing one or more CRL's (in PEM format) to load"},
  64     {"crl_download", OPT_CRL_DOWNLOAD, '-',
  65         "Try downloading CRL information for certificates via their CDP entries"},
  66     {"show_chain", OPT_SHOW_CHAIN, '-',
  67         "Display information about the certificate chain"},
  68
  69     OPT_V_OPTIONS,
  70     {"vfyopt", OPT_VFYOPT, 's', "Verification parameter in n:v form"},
  71
  72     OPT_PROV_OPTIONS,
  73
  74     OPT_PARAMETERS(),
  75     {"cert", 0, 0, "Certificate(s) to verify (optional; stdin used otherwise)"},
  76     {NULL}
  77 };
  78
  79 int verify_main(int argc, char **argv)
  80 {
  81     ENGINE *e = NULL;
  82     STACK_OF(X509) *untrusted = NULL, *trusted = NULL;
  83     STACK_OF(X509_CRL) *crls = NULL;
  84     STACK_OF(OPENSSL_STRING) *vfyopts = NULL;
  85     X509_STORE *store = NULL;
  86     X509_VERIFY_PARAM *vpm = NULL;
  87     const char *prog, *CApath = NULL, *CAfile = NULL, *CAstore = NULL;
  88     int noCApath = 0, noCAfile = 0, noCAstore = 0;
  89     int vpmtouched = 0, crl_download = 0, show_chain = 0, i = 0, ret = 1;
  90     OPTION_CHOICE o;
  91
  92     if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
  93         goto end;
  94
  95     prog = opt_init(argc, argv, verify_options);
  96     while ((o = opt_next()) != OPT_EOF) {
  97         switch (o) {
  98         case OPT_EOF:
  99         case OPT_ERR:
 100  opthelp:
 101             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 102             goto end;
 103         case OPT_HELP:
 104             opt_help(verify_options);
 105             BIO_printf(bio_err, "\nRecognized certificate chain purposes:\n");
 106             for (i = 0; i < X509_PURPOSE_get_count(); i++) {
 107                 X509_PURPOSE *ptmp = X509_PURPOSE_get0(i);
 108
 109                 BIO_printf(bio_err, "  %-15s  %s\n",
 110                         X509_PURPOSE_get0_sname(ptmp),
 111                         X509_PURPOSE_get0_name(ptmp));
 112             }
 113
 114             BIO_printf(bio_err, "Recognized certificate policy names:\n");
 115             for (i = 0; i < X509_VERIFY_PARAM_get_count(); i++) {
 116                 const X509_VERIFY_PARAM *vptmp = X509_VERIFY_PARAM_get0(i);
 117
 118                 BIO_printf(bio_err, "  %s\n",
 119                         X509_VERIFY_PARAM_get0_name(vptmp));
 120             }
 121             ret = 0;
 122             goto end;
 123         case OPT_V_CASES:
 124             if (!opt_verify(o, vpm))
 125                 goto end;
 126             vpmtouched++;
 127             break;
 128         case OPT_CAPATH:
 129             CApath = opt_arg();
 130             break;
 131         case OPT_CAFILE:
 132             CAfile = opt_arg();
 133             break;
 134         case OPT_CASTORE:
 135             CAstore = opt_arg();
 136             break;
 137         case OPT_NOCAPATH:
 138             noCApath = 1;
 139             break;
 140         case OPT_NOCAFILE:
 141             noCAfile = 1;
 142             break;
 143         case OPT_NOCASTORE:
 144             noCAstore = 1;
 145             break;
 146         case OPT_UNTRUSTED:
 147             /* Zero or more times */
 148             if (!load_certs(opt_arg(), &untrusted, NULL,
 149                             "untrusted certificates"))
 150                 goto end;
 151             break;
 152         case OPT_TRUSTED:
 153             /* Zero or more times */
 154             noCAfile = 1;
 155             noCApath = 1;
 156             noCAstore = 1;
 157             if (!load_certs(opt_arg(), &trusted, NULL, "trusted certificates"))
 158                 goto end;
 159             break;
 160         case OPT_CRLFILE:
 161             /* Zero or more times */
 162             if (!load_crls(opt_arg(), &crls, NULL, "other CRLs"))
 163                 goto end;
 164             break;
 165         case OPT_CRL_DOWNLOAD:
 166             crl_download = 1;
 167             break;
 168         case OPT_ENGINE:
 169             if ((e = setup_engine(opt_arg(), 0)) == NULL) {
 170                 /* Failure message already displayed */
 171                 goto end;
 172             }
 173             break;
 174         case OPT_SHOW_CHAIN:
 175             show_chain = 1;
 176             break;
 177         case OPT_NAMEOPT:
 178             if (!set_nameopt(opt_arg()))
 179                 goto end;
 180             break;
 181         case OPT_VFYOPT:
 182             if (!vfyopts)
 183                 vfyopts = sk_OPENSSL_STRING_new_null();
 184             if (!vfyopts || !sk_OPENSSL_STRING_push(vfyopts, opt_arg()))
 185                 goto opthelp;
 186             break;
 187         case OPT_VERBOSE:
 188             v_verbose = 1;
 189             break;
 190         case OPT_PROV_CASES:
 191             if (!opt_provider(o))
 192                 goto end;
 193             break;
 194         }
 195     }
 196     argc = opt_num_rest();
 197     argv = opt_rest();
 198     if (trusted != NULL
 199         && (CAfile != NULL || CApath != NULL || CAstore != NULL)) {
 200         BIO_printf(bio_err,
 201                    "%s: Cannot use -trusted with -CAfile, -CApath or -CAstore\n",
 202                    prog);
 203         goto end;
 204     }
 205
 206     if ((store = setup_verify(CAfile, noCAfile, CApath, noCApath,
 207                               CAstore, noCAstore)) == NULL)
 208         goto end;
 209     X509_STORE_set_verify_cb(store, cb);
 210
 211     if (vpmtouched)
 212         X509_STORE_set1_param(store, vpm);
 213
 214     ERR_clear_error();
 215
 216     if (crl_download)
 217         store_setup_crl_download(store);
 218
 219     ret = 0;
 220     if (argc < 1) {
 221         if (check(store, NULL, untrusted, trusted, crls, show_chain,
 222                   vfyopts) != 1)
 223             ret = -1;
 224     } else {
 225         for (i = 0; i < argc; i++)
 226             if (check(store, argv[i], untrusted, trusted, crls, show_chain,
 227                       vfyopts) != 1)
 228                 ret = -1;
 229     }
 230
 231  end:
 232     X509_VERIFY_PARAM_free(vpm);
 233     X509_STORE_free(store);
 234     sk_X509_pop_free(untrusted, X509_free);
 235     sk_X509_pop_free(trusted, X509_free);
 236     sk_X509_CRL_pop_free(crls, X509_CRL_free);
 237     sk_OPENSSL_STRING_free(vfyopts);
 238     release_engine(e);
 239     return (ret < 0 ? 2 : ret);
 240 }
 241
 242 static int check(X509_STORE *ctx, const char *file,
 243                  STACK_OF(X509) *uchain, STACK_OF(X509) *tchain,
 244                  STACK_OF(X509_CRL) *crls, int show_chain,
 245                  STACK_OF(OPENSSL_STRING) *opts)
 246 {
 247     X509 *x = NULL;
 248     int i = 0, ret = 0;
 249     X509_STORE_CTX *csc;
 250     STACK_OF(X509) *chain = NULL;
 251     int num_untrusted;
 252
 253     x = load_cert(file, FORMAT_UNDEF, "certificate file");
 254     if (x == NULL)
 255         goto end;
 256
 257     if (opts != NULL) {
 258         for (i = 0; i < sk_OPENSSL_STRING_num(opts); i++) {
 259             char *opt = sk_OPENSSL_STRING_value(opts, i);
 260             if (x509_ctrl_string(x, opt) <= 0) {
 261                 BIO_printf(bio_err, "parameter error \"%s\"\n", opt);
 262                 ERR_print_errors(bio_err);
 263                 return 0;
 264             }
 265         }
 266     }
 267
 268     csc = X509_STORE_CTX_new();
 269     if (csc == NULL) {
 270         BIO_printf(bio_err, "error %s: X.509 store context allocation failed\n",
 271                    (file == NULL) ? "stdin" : file);
 272         goto end;
 273     }
 274
 275     X509_STORE_set_flags(ctx, vflags);
 276     if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) {
 277         X509_STORE_CTX_free(csc);
 278         BIO_printf(bio_err,
 279                    "error %s: X.509 store context initialization failed\n",
 280                    (file == NULL) ? "stdin" : file);
 281         goto end;
 282     }
 283     if (tchain != NULL)
 284         X509_STORE_CTX_set0_trusted_stack(csc, tchain);
 285     if (crls != NULL)
 286         X509_STORE_CTX_set0_crls(csc, crls);
 287     i = X509_verify_cert(csc);
 288     if (i > 0 && X509_STORE_CTX_get_error(csc) == X509_V_OK) {
 289         BIO_printf(bio_out, "%s: OK\n", (file == NULL) ? "stdin" : file);
 290         ret = 1;
 291         if (show_chain) {
 292             int j;
 293
 294             chain = X509_STORE_CTX_get1_chain(csc);
 295             num_untrusted = X509_STORE_CTX_get_num_untrusted(csc);
 296             BIO_printf(bio_out, "Chain:\n");
 297             for (j = 0; j < sk_X509_num(chain); j++) {
 298                 X509 *cert = sk_X509_value(chain, j);
 299                 BIO_printf(bio_out, "depth=%d: ", j);
 300                 X509_NAME_print_ex_fp(stdout,
 301                                       X509_get_subject_name(cert),
 302                                       0, get_nameopt());
 303                 if (j < num_untrusted)
 304                     BIO_printf(bio_out, " (untrusted)");
 305                 BIO_printf(bio_out, "\n");
 306             }
 307             sk_X509_pop_free(chain, X509_free);
 308         }
 309     } else {
 310         BIO_printf(bio_err,
 311                    "error %s: verification failed\n",
 312                    (file == NULL) ? "stdin" : file);
 313     }
 314     X509_STORE_CTX_free(csc);
 315
 316  end:
 317     if (i <= 0)
 318         ERR_print_errors(bio_err);
 319     X509_free(x);
 320
 321     return ret;
 322 }
 323
 324 static int cb(int ok, X509_STORE_CTX *ctx)
 325 {
 326     int cert_error = X509_STORE_CTX_get_error(ctx);
 327     X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx);
 328
 329     if (!ok) {
 330         if (current_cert != NULL) {
 331             X509_NAME_print_ex(bio_err,
 332                             X509_get_subject_name(current_cert),
 333                             0, get_nameopt());
 334             BIO_printf(bio_err, "\n");
 335         }
 336         BIO_printf(bio_err, "%serror %d at %d depth lookup: %s\n",
 337                X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path] " : "",
 338                cert_error,
 339                X509_STORE_CTX_get_error_depth(ctx),
 340                X509_verify_cert_error_string(cert_error));
 341
 342         /*
 343          * Pretend that some errors are ok, so they don't stop further
 344          * processing of the certificate chain.  Setting ok = 1 does this.
 345          * After X509_verify_cert() is done, we verify that there were
 346          * no actual errors, even if the returned value was positive.
 347          */
 348         switch (cert_error) {
 349         case X509_V_ERR_NO_EXPLICIT_POLICY:
 350             policies_print(ctx);
 351             /* fall thru */
 352         case X509_V_ERR_CERT_HAS_EXPIRED:
 353             /* Continue even if the leaf is a self-signed cert */
 354         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
 355             /* Continue after extension errors too */
 356         case X509_V_ERR_INVALID_CA:
 357         case X509_V_ERR_INVALID_NON_CA:
 358         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
 359         case X509_V_ERR_INVALID_PURPOSE:
 360         case X509_V_ERR_CRL_HAS_EXPIRED:
 361         case X509_V_ERR_CRL_NOT_YET_VALID:
 362         case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
 363             ok = 1;
 364         }
 365
 366         return ok;
 367
 368     }
 369     if (cert_error == X509_V_OK && ok == 2)
 370         policies_print(ctx);
 371     if (!v_verbose)
 372         ERR_clear_error();
 373     return ok;
 374 }