1/* 2 * Copyright 1995-2022 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 21static int cb(int ok, X509_STORE_CTX *ctx); 22static 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); 26static int v_verbose = 0, vflags = 0; 27 28typedef enum OPTION_choice { 29 OPT_COMMON, 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 38const 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 79int 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(), 0, &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(), 0, &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 } 196 197 /* Extra arguments are certificates to verify. */ 198 argc = opt_num_rest(); 199 argv = opt_rest(); 200 201 if (trusted != NULL 202 && (CAfile != NULL || CApath != NULL || CAstore != NULL)) { 203 BIO_printf(bio_err, 204 "%s: Cannot use -trusted with -CAfile, -CApath or -CAstore\n", 205 prog); 206 goto end; 207 } 208 209 if ((store = setup_verify(CAfile, noCAfile, CApath, noCApath, 210 CAstore, noCAstore)) == NULL) 211 goto end; 212 X509_STORE_set_verify_cb(store, cb); 213 214 if (vpmtouched) 215 X509_STORE_set1_param(store, vpm); 216 217 ERR_clear_error(); 218 219 if (crl_download) 220 store_setup_crl_download(store); 221 222 ret = 0; 223 if (argc < 1) { 224 if (check(store, NULL, untrusted, trusted, crls, show_chain, 225 vfyopts) != 1) 226 ret = -1; 227 } else { 228 for (i = 0; i < argc; i++) 229 if (check(store, argv[i], untrusted, trusted, crls, show_chain, 230 vfyopts) != 1) 231 ret = -1; 232 } 233 234 end: 235 X509_VERIFY_PARAM_free(vpm); 236 X509_STORE_free(store); 237 sk_X509_pop_free(untrusted, X509_free); 238 sk_X509_pop_free(trusted, X509_free); 239 sk_X509_CRL_pop_free(crls, X509_CRL_free); 240 sk_OPENSSL_STRING_free(vfyopts); 241 release_engine(e); 242 return (ret < 0 ? 2 : ret); 243} 244 245static int check(X509_STORE *ctx, const char *file, 246 STACK_OF(X509) *uchain, STACK_OF(X509) *tchain, 247 STACK_OF(X509_CRL) *crls, int show_chain, 248 STACK_OF(OPENSSL_STRING) *opts) 249{ 250 X509 *x = NULL; 251 int i = 0, ret = 0; 252 X509_STORE_CTX *csc; 253 STACK_OF(X509) *chain = NULL; 254 int num_untrusted; 255 256 x = load_cert(file, FORMAT_UNDEF, "certificate file"); 257 if (x == NULL) 258 goto end; 259 260 if (opts != NULL) { 261 for (i = 0; i < sk_OPENSSL_STRING_num(opts); i++) { 262 char *opt = sk_OPENSSL_STRING_value(opts, i); 263 if (x509_ctrl_string(x, opt) <= 0) { 264 BIO_printf(bio_err, "parameter error \"%s\"\n", opt); 265 ERR_print_errors(bio_err); 266 X509_free(x); 267 return 0; 268 } 269 } 270 } 271 272 csc = X509_STORE_CTX_new(); 273 if (csc == NULL) { 274 BIO_printf(bio_err, "error %s: X.509 store context allocation failed\n", 275 (file == NULL) ? "stdin" : file); 276 goto end; 277 } 278 279 X509_STORE_set_flags(ctx, vflags); 280 if (!X509_STORE_CTX_init(csc, ctx, x, uchain)) { 281 X509_STORE_CTX_free(csc); 282 BIO_printf(bio_err, 283 "error %s: X.509 store context initialization failed\n", 284 (file == NULL) ? "stdin" : file); 285 goto end; 286 } 287 if (tchain != NULL) 288 X509_STORE_CTX_set0_trusted_stack(csc, tchain); 289 if (crls != NULL) 290 X509_STORE_CTX_set0_crls(csc, crls); 291 i = X509_verify_cert(csc); 292 if (i > 0 && X509_STORE_CTX_get_error(csc) == X509_V_OK) { 293 BIO_printf(bio_out, "%s: OK\n", (file == NULL) ? "stdin" : file); 294 ret = 1; 295 if (show_chain) { 296 int j; 297 298 chain = X509_STORE_CTX_get1_chain(csc); 299 num_untrusted = X509_STORE_CTX_get_num_untrusted(csc); 300 BIO_printf(bio_out, "Chain:\n"); 301 for (j = 0; j < sk_X509_num(chain); j++) { 302 X509 *cert = sk_X509_value(chain, j); 303 BIO_printf(bio_out, "depth=%d: ", j); 304 X509_NAME_print_ex_fp(stdout, 305 X509_get_subject_name(cert), 306 0, get_nameopt()); 307 if (j < num_untrusted) 308 BIO_printf(bio_out, " (untrusted)"); 309 BIO_printf(bio_out, "\n"); 310 } 311 sk_X509_pop_free(chain, X509_free); 312 } 313 } else { 314 BIO_printf(bio_err, 315 "error %s: verification failed\n", 316 (file == NULL) ? "stdin" : file); 317 } 318 X509_STORE_CTX_free(csc); 319 320 end: 321 if (i <= 0) 322 ERR_print_errors(bio_err); 323 X509_free(x); 324 325 return ret; 326} 327 328static int cb(int ok, X509_STORE_CTX *ctx) 329{ 330 int cert_error = X509_STORE_CTX_get_error(ctx); 331 X509 *current_cert = X509_STORE_CTX_get_current_cert(ctx); 332 333 if (!ok) { 334 if (current_cert != NULL) { 335 X509_NAME_print_ex(bio_err, 336 X509_get_subject_name(current_cert), 337 0, get_nameopt()); 338 BIO_printf(bio_err, "\n"); 339 } 340 BIO_printf(bio_err, "%serror %d at %d depth lookup: %s\n", 341 X509_STORE_CTX_get0_parent_ctx(ctx) ? "[CRL path] " : "", 342 cert_error, 343 X509_STORE_CTX_get_error_depth(ctx), 344 X509_verify_cert_error_string(cert_error)); 345 346 /* 347 * Pretend that some errors are ok, so they don't stop further 348 * processing of the certificate chain. Setting ok = 1 does this. 349 * After X509_verify_cert() is done, we verify that there were 350 * no actual errors, even if the returned value was positive. 351 */ 352 switch (cert_error) { 353 case X509_V_ERR_NO_EXPLICIT_POLICY: 354 policies_print(ctx); 355 /* fall thru */ 356 case X509_V_ERR_CERT_HAS_EXPIRED: 357 /* Continue even if the leaf is a self-signed cert */ 358 case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: 359 /* Continue after extension errors too */ 360 case X509_V_ERR_INVALID_CA: 361 case X509_V_ERR_INVALID_NON_CA: 362 case X509_V_ERR_PATH_LENGTH_EXCEEDED: 363 case X509_V_ERR_CRL_HAS_EXPIRED: 364 case X509_V_ERR_CRL_NOT_YET_VALID: 365 case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION: 366 /* errors due to strict conformance checking (-x509_strict) */ 367 case X509_V_ERR_INVALID_PURPOSE: 368 case X509_V_ERR_PATHLEN_INVALID_FOR_NON_CA: 369 case X509_V_ERR_PATHLEN_WITHOUT_KU_KEY_CERT_SIGN: 370 case X509_V_ERR_CA_BCONS_NOT_CRITICAL: 371 case X509_V_ERR_CA_CERT_MISSING_KEY_USAGE: 372 case X509_V_ERR_KU_KEY_CERT_SIGN_INVALID_FOR_NON_CA: 373 case X509_V_ERR_ISSUER_NAME_EMPTY: 374 case X509_V_ERR_SUBJECT_NAME_EMPTY: 375 case X509_V_ERR_EMPTY_SUBJECT_SAN_NOT_CRITICAL: 376 case X509_V_ERR_EMPTY_SUBJECT_ALT_NAME: 377 case X509_V_ERR_SIGNATURE_ALGORITHM_INCONSISTENCY: 378 case X509_V_ERR_AUTHORITY_KEY_IDENTIFIER_CRITICAL: 379 case X509_V_ERR_SUBJECT_KEY_IDENTIFIER_CRITICAL: 380 case X509_V_ERR_MISSING_AUTHORITY_KEY_IDENTIFIER: 381 case X509_V_ERR_MISSING_SUBJECT_KEY_IDENTIFIER: 382 case X509_V_ERR_EXTENSIONS_REQUIRE_VERSION_3: 383 ok = 1; 384 } 385 return ok; 386 387 } 388 if (cert_error == X509_V_OK && ok == 2) 389 policies_print(ctx); 390 if (!v_verbose) 391 ERR_clear_error(); 392 return ok; 393} 394