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
verify_opt_args(int argc,char ** argv,int * argsused)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
verify_usage(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
verify_main(int argc,char ** argv)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
check(X509_STORE * ctx,char * file,STACK_OF (X509)* uchain,STACK_OF (X509)* tchain,STACK_OF (X509_CRL)* crls)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
cb(int ok,X509_STORE_CTX * ctx)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