1 /* $OpenBSD: verify.c,v 1.14 2021/02/15 17:57:58 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include "apps.h" 64 65 #include <openssl/bio.h> 66 #include <openssl/err.h> 67 #include <openssl/pem.h> 68 #include <openssl/x509.h> 69 #include <openssl/x509v3.h> 70 71 static int cb(int ok, X509_STORE_CTX *ctx); 72 static int check(X509_STORE *ctx, char *file, STACK_OF(X509) *uchain, 73 STACK_OF(X509) *tchain, STACK_OF(X509_CRL) *crls); 74 static int vflags = 0; 75 76 static struct { 77 char *CAfile; 78 char *CApath; 79 char *crlfile; 80 char *trustfile; 81 char *untfile; 82 int verbose; 83 X509_VERIFY_PARAM *vpm; 84 } verify_config; 85 86 static int 87 verify_opt_args(int argc, char **argv, int *argsused) 88 { 89 int oargc = argc; 90 int badarg = 0; 91 92 if (!args_verify(&argv, &argc, &badarg, bio_err, &verify_config.vpm)) 93 return (1); 94 if (badarg) 95 return (1); 96 97 *argsused = oargc - argc; 98 99 return (0); 100 } 101 102 static const struct option verify_options[] = { 103 { 104 .name = "CAfile", 105 .argname = "file", 106 .desc = "Certificate Authority file", 107 .type = OPTION_ARG, 108 .opt.arg = &verify_config.CAfile, 109 }, 110 { 111 .name = "CApath", 112 .argname = "path", 113 .desc = "Certificate Authority path", 114 .type = OPTION_ARG, 115 .opt.arg = &verify_config.CApath, 116 }, 117 { 118 .name = "CRLfile", 119 .argname = "file", 120 .desc = "Certificate Revocation List file", 121 .type = OPTION_ARG, 122 .opt.arg = &verify_config.crlfile, 123 }, 124 { 125 .name = "trusted", 126 .argname = "file", 127 .desc = "Trusted certificates file", 128 .type = OPTION_ARG, 129 .opt.arg = &verify_config.trustfile, 130 }, 131 { 132 .name = "untrusted", 133 .argname = "file", 134 .desc = "Untrusted certificates file", 135 .type = OPTION_ARG, 136 .opt.arg = &verify_config.untfile, 137 }, 138 { 139 .name = "verbose", 140 .desc = "Verbose", 141 .type = OPTION_FLAG, 142 .opt.flag = &verify_config.verbose, 143 }, 144 { 145 .name = NULL, 146 .desc = "", 147 .type = OPTION_ARGV_FUNC, 148 .opt.argvfunc = verify_opt_args, 149 }, 150 { NULL }, 151 }; 152 153 static const struct option verify_shared_options[] = { 154 { 155 .name = "attime", 156 .argname = "epoch", 157 .desc = "Use epoch as the verification time", 158 }, 159 { 160 .name = "check_ss_sig", 161 .desc = "Check the root CA self-signed certificate signature", 162 }, 163 { 164 .name = "crl_check", 165 .desc = "Enable CRL checking for the leaf certificate", 166 }, 167 { 168 .name = "crl_check_all", 169 .desc = "Enable CRL checking for the entire certificate chain", 170 }, 171 { 172 .name = "explicit_policy", 173 .desc = "Require explicit policy (per RFC 3280)", 174 }, 175 { 176 .name = "extended_crl", 177 .desc = "Enable extended CRL support", 178 }, 179 { 180 .name = "ignore_critical", 181 .desc = "Disable critical extension checking", 182 }, 183 { 184 .name = "inhibit_any", 185 .desc = "Inhibit any policy (per RFC 3280)", 186 }, 187 { 188 .name = "inhibit_map", 189 .desc = "Inhibit policy mapping (per RFC 3280)", 190 }, 191 { 192 .name = "issuer_checks", 193 .desc = "Enable debugging of certificate issuer checks", 194 }, 195 { 196 .name = "legacy_verify", 197 .desc = "Use legacy certificate chain verification", 198 }, 199 { 200 .name = "policy", 201 .argname = "name", 202 .desc = "Add given policy to the acceptable set", 203 }, 204 { 205 .name = "policy_check", 206 .desc = "Enable certificate policy checking", 207 }, 208 { 209 .name = "policy_print", 210 .desc = "Print policy", 211 }, 212 { 213 .name = "purpose", 214 .argname = "name", 215 .desc = "Verify for the given purpose", 216 }, 217 { 218 .name = "use_deltas", 219 .desc = "Use delta CRLS (if present)", 220 }, 221 { 222 .name = "verify_depth", 223 .argname = "num", 224 .desc = "Limit verification to the given depth", 225 }, 226 { 227 .name = "x509_strict", 228 .desc = "Use strict X.509 rules (disables workarounds)", 229 }, 230 { NULL }, 231 }; 232 233 static void 234 verify_usage(void) 235 { 236 int i; 237 238 fprintf(stderr, 239 "usage: verify [-CAfile file] [-CApath directory] [-check_ss_sig]\n" 240 " [-CRLfile file] [-crl_check] [-crl_check_all]\n" 241 " [-explicit_policy] [-extended_crl]\n" 242 " [-ignore_critical] [-inhibit_any] [-inhibit_map]\n" 243 " [-issuer_checks] [-policy_check] [-purpose purpose]\n" 244 " [-trusted file] [-untrusted file] [-verbose]\n" 245 " [-x509_strict] [certificates]\n\n"); 246 247 options_usage(verify_options); 248 249 fprintf(stderr, "\nVerification options:\n\n"); 250 options_usage(verify_shared_options); 251 252 fprintf(stderr, "\nValid purposes:\n\n"); 253 for (i = 0; i < X509_PURPOSE_get_count(); i++) { 254 X509_PURPOSE *ptmp = X509_PURPOSE_get0(i); 255 fprintf(stderr, " %-18s%s\n", X509_PURPOSE_get0_sname(ptmp), 256 X509_PURPOSE_get0_name(ptmp)); 257 } 258 } 259 260 int 261 verify_main(int argc, char **argv) 262 { 263 STACK_OF(X509) *untrusted = NULL, *trusted = NULL; 264 STACK_OF(X509_CRL) *crls = NULL; 265 X509_STORE *cert_ctx = NULL; 266 X509_LOOKUP *lookup = NULL; 267 char **cert_files = NULL; 268 int argsused; 269 int ret = 1; 270 271 if (single_execution) { 272 if (pledge("stdio rpath", NULL) == -1) { 273 perror("pledge"); 274 exit(1); 275 } 276 } 277 278 memset(&verify_config, 0, sizeof(verify_config)); 279 280 if (options_parse(argc, argv, verify_options, NULL, &argsused) != 0) { 281 verify_usage(); 282 goto end; 283 } 284 285 if (argsused < argc) 286 cert_files = &argv[argsused]; 287 288 cert_ctx = X509_STORE_new(); 289 if (cert_ctx == NULL) 290 goto end; 291 X509_STORE_set_verify_cb(cert_ctx, cb); 292 293 if (verify_config.vpm) 294 X509_STORE_set1_param(cert_ctx, verify_config.vpm); 295 296 lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file()); 297 if (lookup == NULL) 298 abort(); /* XXX */ 299 if (verify_config.CAfile) { 300 if (!X509_LOOKUP_load_file(lookup, verify_config.CAfile, 301 X509_FILETYPE_PEM)) { 302 BIO_printf(bio_err, "Error loading file %s\n", 303 verify_config.CAfile); 304 ERR_print_errors(bio_err); 305 goto end; 306 } 307 } else 308 X509_LOOKUP_load_file(lookup, NULL, X509_FILETYPE_DEFAULT); 309 310 lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_hash_dir()); 311 if (lookup == NULL) 312 abort(); /* XXX */ 313 if (verify_config.CApath) { 314 if (!X509_LOOKUP_add_dir(lookup, verify_config.CApath, 315 X509_FILETYPE_PEM)) { 316 BIO_printf(bio_err, "Error loading directory %s\n", 317 verify_config.CApath); 318 ERR_print_errors(bio_err); 319 goto end; 320 } 321 } else 322 X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT); 323 324 ERR_clear_error(); 325 326 if (verify_config.untfile) { 327 untrusted = load_certs(bio_err, verify_config.untfile, 328 FORMAT_PEM, NULL, "untrusted certificates"); 329 if (!untrusted) 330 goto end; 331 } 332 if (verify_config.trustfile) { 333 trusted = load_certs(bio_err, verify_config.trustfile, 334 FORMAT_PEM, NULL, "trusted certificates"); 335 if (!trusted) 336 goto end; 337 } 338 if (verify_config.crlfile) { 339 crls = load_crls(bio_err, verify_config.crlfile, FORMAT_PEM, 340 NULL, "other CRLs"); 341 if (!crls) 342 goto end; 343 } 344 ret = 0; 345 if (cert_files == NULL) { 346 if (1 != check(cert_ctx, NULL, untrusted, trusted, crls)) 347 ret = -1; 348 } else { 349 do { 350 if (1 != check(cert_ctx, *cert_files++, untrusted, 351 trusted, crls)) 352 ret = -1; 353 } while (*cert_files != NULL); 354 } 355 356 end: 357 if (verify_config.vpm) 358 X509_VERIFY_PARAM_free(verify_config.vpm); 359 if (cert_ctx != NULL) 360 X509_STORE_free(cert_ctx); 361 sk_X509_pop_free(untrusted, X509_free); 362 sk_X509_pop_free(trusted, X509_free); 363 sk_X509_CRL_pop_free(crls, X509_CRL_free); 364 365 return (ret < 0 ? 2 : ret); 366 } 367 368 static int 369 check(X509_STORE *ctx, char *file, STACK_OF(X509) *uchain, 370 STACK_OF(X509) *tchain, STACK_OF(X509_CRL) *crls) 371 { 372 X509 *x = NULL; 373 X509_STORE_CTX *csc = NULL; 374 const char *certfile = (file == NULL) ? "stdin" : file; 375 int verify_err; 376 int i = 0, ret = 0; 377 378 x = load_cert(bio_err, file, FORMAT_PEM, NULL, "certificate file"); 379 if (x == NULL) 380 goto end; 381 382 if ((csc = X509_STORE_CTX_new()) == NULL) 383 goto end; 384 X509_STORE_set_flags(ctx, vflags); 385 if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) 386 goto end; 387 if (tchain) 388 X509_STORE_CTX_trusted_stack(csc, tchain); 389 if (crls) 390 X509_STORE_CTX_set0_crls(csc, crls); 391 392 i = X509_verify_cert(csc); 393 verify_err = X509_STORE_CTX_get_error(csc); 394 395 if (i > 0 && verify_err == X509_V_OK) { 396 fprintf(stdout, "%s: OK\n", certfile); 397 ret = 1; 398 } else { 399 fprintf(stdout, "%s: verification failed: %d (%s)\n", certfile, 400 verify_err, X509_verify_cert_error_string(verify_err)); 401 } 402 403 end: 404 if (i <= 0) 405 ERR_print_errors(bio_err); 406 X509_free(x); 407 X509_STORE_CTX_free(csc); 408 409 return (ret); 410 } 411 412 static int 413 cb(int ok, X509_STORE_CTX *ctx) 414 { 415 int cert_error = X509_STORE_CTX_get_error(ctx); 416 X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx); 417 418 if (!ok) { 419 if (current_cert) { 420 X509_NAME_print_ex_fp(stdout, 421 X509_get_subject_name(current_cert), 422 0, XN_FLAG_ONELINE); 423 printf("\n"); 424 } 425 printf("%serror %d at %d depth lookup:%s\n", 426 X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path]" : "", 427 cert_error, 428 X509_STORE_CTX_get_error_depth(ctx), 429 X509_verify_cert_error_string(cert_error)); 430 switch (cert_error) { 431 case X509_V_ERR_NO_EXPLICIT_POLICY: 432 policies_print(NULL, ctx); 433 case X509_V_ERR_CERT_HAS_EXPIRED: 434 435 /* 436 * since we are just checking the certificates, it is 437 * ok if they are self signed. But we should still 438 * warn the user. 439 */ 440 441 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: 442 /* Continue after extension errors too */ 443 case X509_V_ERR_INVALID_CA: 444 case X509_V_ERR_INVALID_NON_CA: 445 case X509_V_ERR_PATH_LENGTH_EXCEEDED: 446 case X509_V_ERR_INVALID_PURPOSE: 447 case X509_V_ERR_CRL_HAS_EXPIRED: 448 case X509_V_ERR_CRL_NOT_YET_VALID: 449 case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION: 450 ok = 1; 451 452 } 453 454 return ok; 455 456 } 457 if (cert_error == X509_V_OK && ok == 2) 458 policies_print(NULL, ctx); 459 if (!verify_config.verbose) 460 ERR_clear_error(); 461 return (ok); 462 } 463