1 /*
2 * Certificate reading application
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20 #include "mbedtls/build_info.h"
21
22 #include "mbedtls/platform.h"
23
24 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
25 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
26 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
27 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
28 !defined(MBEDTLS_CTR_DRBG_C) || defined(MBEDTLS_X509_REMOVE_INFO)
main(void)29 int main(void)
30 {
31 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
32 "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
33 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
34 "MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_FS_IO and/or "
35 "MBEDTLS_CTR_DRBG_C not defined and/or MBEDTLS_X509_REMOVE_INFO defined.\n");
36 mbedtls_exit(0);
37 }
38 #else
39
40 #include "mbedtls/entropy.h"
41 #include "mbedtls/ctr_drbg.h"
42 #include "mbedtls/net_sockets.h"
43 #include "mbedtls/ssl.h"
44 #include "mbedtls/x509.h"
45 #include "mbedtls/debug.h"
46
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50
51 #define MODE_NONE 0
52 #define MODE_FILE 1
53 #define MODE_SSL 2
54
55 #define DFL_MODE MODE_NONE
56 #define DFL_FILENAME "cert.crt"
57 #define DFL_CA_FILE ""
58 #define DFL_CRL_FILE ""
59 #define DFL_CA_PATH ""
60 #define DFL_SERVER_NAME "localhost"
61 #define DFL_SERVER_PORT "4433"
62 #define DFL_DEBUG_LEVEL 0
63 #define DFL_PERMISSIVE 0
64
65 #define USAGE_IO \
66 " ca_file=%%s The single file containing the top-level CA(s) you fully trust\n" \
67 " default: \"\" (none)\n" \
68 " crl_file=%%s The single CRL file you want to use\n" \
69 " default: \"\" (none)\n" \
70 " ca_path=%%s The path containing the top-level CA(s) you fully trust\n" \
71 " default: \"\" (none) (overrides ca_file)\n"
72
73 #define USAGE \
74 "\n usage: cert_app param=<>...\n" \
75 "\n acceptable parameters:\n" \
76 " mode=file|ssl default: none\n" \
77 " filename=%%s default: cert.crt\n" \
78 USAGE_IO \
79 " server_name=%%s default: localhost\n" \
80 " server_port=%%d default: 4433\n" \
81 " debug_level=%%d default: 0 (disabled)\n" \
82 " permissive=%%d default: 0 (disabled)\n" \
83 "\n"
84
85
86 /*
87 * global options
88 */
89 struct options {
90 int mode; /* the mode to run the application in */
91 const char *filename; /* filename of the certificate file */
92 const char *ca_file; /* the file with the CA certificate(s) */
93 const char *crl_file; /* the file with the CRL to use */
94 const char *ca_path; /* the path with the CA certificate(s) reside */
95 const char *server_name; /* hostname of the server (client only) */
96 const char *server_port; /* port on which the ssl service runs */
97 int debug_level; /* level of debugging */
98 int permissive; /* permissive parsing */
99 } opt;
100
my_debug(void * ctx,int level,const char * file,int line,const char * str)101 static void my_debug(void *ctx, int level,
102 const char *file, int line,
103 const char *str)
104 {
105 ((void) level);
106
107 mbedtls_fprintf((FILE *) ctx, "%s:%04d: %s", file, line, str);
108 fflush((FILE *) ctx);
109 }
110
my_verify(void * data,mbedtls_x509_crt * crt,int depth,uint32_t * flags)111 static int my_verify(void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags)
112 {
113 char buf[1024];
114 ((void) data);
115
116 mbedtls_printf("\nVerify requested for (Depth %d):\n", depth);
117 mbedtls_x509_crt_info(buf, sizeof(buf) - 1, "", crt);
118 mbedtls_printf("%s", buf);
119
120 if ((*flags) == 0) {
121 mbedtls_printf(" This certificate has no flags\n");
122 } else {
123 mbedtls_x509_crt_verify_info(buf, sizeof(buf), " ! ", *flags);
124 mbedtls_printf("%s\n", buf);
125 }
126
127 return 0;
128 }
129
main(int argc,char * argv[])130 int main(int argc, char *argv[])
131 {
132 int ret = 1;
133 int exit_code = MBEDTLS_EXIT_FAILURE;
134 mbedtls_net_context server_fd;
135 unsigned char buf[1024];
136 mbedtls_entropy_context entropy;
137 mbedtls_ctr_drbg_context ctr_drbg;
138 mbedtls_ssl_context ssl;
139 mbedtls_ssl_config conf;
140 mbedtls_x509_crt cacert;
141 mbedtls_x509_crl cacrl;
142 int i, j;
143 uint32_t flags;
144 int verify = 0;
145 char *p, *q;
146 const char *pers = "cert_app";
147
148 /*
149 * Set to sane values
150 */
151 mbedtls_net_init(&server_fd);
152 mbedtls_ctr_drbg_init(&ctr_drbg);
153 mbedtls_ssl_init(&ssl);
154 mbedtls_ssl_config_init(&conf);
155 mbedtls_x509_crt_init(&cacert);
156 #if defined(MBEDTLS_X509_CRL_PARSE_C)
157 mbedtls_x509_crl_init(&cacrl);
158 #else
159 /* Zeroize structure as CRL parsing is not supported and we have to pass
160 it to the verify function */
161 memset(&cacrl, 0, sizeof(mbedtls_x509_crl));
162 #endif
163
164 if (argc < 2) {
165 usage:
166 mbedtls_printf(USAGE);
167 goto exit;
168 }
169
170 opt.mode = DFL_MODE;
171 opt.filename = DFL_FILENAME;
172 opt.ca_file = DFL_CA_FILE;
173 opt.crl_file = DFL_CRL_FILE;
174 opt.ca_path = DFL_CA_PATH;
175 opt.server_name = DFL_SERVER_NAME;
176 opt.server_port = DFL_SERVER_PORT;
177 opt.debug_level = DFL_DEBUG_LEVEL;
178 opt.permissive = DFL_PERMISSIVE;
179
180 for (i = 1; i < argc; i++) {
181 p = argv[i];
182 if ((q = strchr(p, '=')) == NULL) {
183 goto usage;
184 }
185 *q++ = '\0';
186
187 for (j = 0; p + j < q; j++) {
188 if (argv[i][j] >= 'A' && argv[i][j] <= 'Z') {
189 argv[i][j] |= 0x20;
190 }
191 }
192
193 if (strcmp(p, "mode") == 0) {
194 if (strcmp(q, "file") == 0) {
195 opt.mode = MODE_FILE;
196 } else if (strcmp(q, "ssl") == 0) {
197 opt.mode = MODE_SSL;
198 } else {
199 goto usage;
200 }
201 } else if (strcmp(p, "filename") == 0) {
202 opt.filename = q;
203 } else if (strcmp(p, "ca_file") == 0) {
204 opt.ca_file = q;
205 } else if (strcmp(p, "crl_file") == 0) {
206 opt.crl_file = q;
207 } else if (strcmp(p, "ca_path") == 0) {
208 opt.ca_path = q;
209 } else if (strcmp(p, "server_name") == 0) {
210 opt.server_name = q;
211 } else if (strcmp(p, "server_port") == 0) {
212 opt.server_port = q;
213 } else if (strcmp(p, "debug_level") == 0) {
214 opt.debug_level = atoi(q);
215 if (opt.debug_level < 0 || opt.debug_level > 65535) {
216 goto usage;
217 }
218 } else if (strcmp(p, "permissive") == 0) {
219 opt.permissive = atoi(q);
220 if (opt.permissive < 0 || opt.permissive > 1) {
221 goto usage;
222 }
223 } else {
224 goto usage;
225 }
226 }
227
228 /*
229 * 1.1. Load the trusted CA
230 */
231 mbedtls_printf(" . Loading the CA root certificate ...");
232 fflush(stdout);
233
234 if (strlen(opt.ca_path)) {
235 if ((ret = mbedtls_x509_crt_parse_path(&cacert, opt.ca_path)) < 0) {
236 mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse_path returned -0x%x\n\n",
237 (unsigned int) -ret);
238 goto exit;
239 }
240
241 verify = 1;
242 } else if (strlen(opt.ca_file)) {
243 if ((ret = mbedtls_x509_crt_parse_file(&cacert, opt.ca_file)) < 0) {
244 mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse_file returned -0x%x\n\n",
245 (unsigned int) -ret);
246 goto exit;
247 }
248
249 verify = 1;
250 }
251
252 mbedtls_printf(" ok (%d skipped)\n", ret);
253
254 #if defined(MBEDTLS_X509_CRL_PARSE_C)
255 if (strlen(opt.crl_file)) {
256 if ((ret = mbedtls_x509_crl_parse_file(&cacrl, opt.crl_file)) != 0) {
257 mbedtls_printf(" failed\n ! mbedtls_x509_crl_parse returned -0x%x\n\n",
258 (unsigned int) -ret);
259 goto exit;
260 }
261
262 verify = 1;
263 }
264 #endif
265
266 if (opt.mode == MODE_FILE) {
267 mbedtls_x509_crt crt;
268 mbedtls_x509_crt *cur = &crt;
269 mbedtls_x509_crt_init(&crt);
270
271 /*
272 * 1.1. Load the certificate(s)
273 */
274 mbedtls_printf("\n . Loading the certificate(s) ...");
275 fflush(stdout);
276
277 ret = mbedtls_x509_crt_parse_file(&crt, opt.filename);
278
279 if (ret < 0) {
280 mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse_file returned %d\n\n", ret);
281 mbedtls_x509_crt_free(&crt);
282 goto exit;
283 }
284
285 if (opt.permissive == 0 && ret > 0) {
286 mbedtls_printf(
287 " failed\n ! mbedtls_x509_crt_parse failed to parse %d certificates\n\n",
288 ret);
289 mbedtls_x509_crt_free(&crt);
290 goto exit;
291 }
292
293 mbedtls_printf(" ok\n");
294
295 /*
296 * 1.2 Print the certificate(s)
297 */
298 while (cur != NULL) {
299 mbedtls_printf(" . Peer certificate information ...\n");
300 ret = mbedtls_x509_crt_info((char *) buf, sizeof(buf) - 1, " ",
301 cur);
302 if (ret == -1) {
303 mbedtls_printf(" failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret);
304 mbedtls_x509_crt_free(&crt);
305 goto exit;
306 }
307
308 mbedtls_printf("%s\n", buf);
309
310 cur = cur->next;
311 }
312
313 /*
314 * 1.3 Verify the certificate
315 */
316 if (verify) {
317 mbedtls_printf(" . Verifying X.509 certificate...");
318
319 if ((ret = mbedtls_x509_crt_verify(&crt, &cacert, &cacrl, NULL, &flags,
320 my_verify, NULL)) != 0) {
321 char vrfy_buf[512];
322
323 mbedtls_printf(" failed\n");
324
325 mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), " ! ", flags);
326
327 mbedtls_printf("%s\n", vrfy_buf);
328 } else {
329 mbedtls_printf(" ok\n");
330 }
331 }
332
333 mbedtls_x509_crt_free(&crt);
334 } else if (opt.mode == MODE_SSL) {
335 /*
336 * 1. Initialize the RNG and the session data
337 */
338 mbedtls_printf("\n . Seeding the random number generator...");
339 fflush(stdout);
340
341 mbedtls_entropy_init(&entropy);
342 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
343 (const unsigned char *) pers,
344 strlen(pers))) != 0) {
345 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret);
346 goto ssl_exit;
347 }
348
349 mbedtls_printf(" ok\n");
350
351 #if defined(MBEDTLS_DEBUG_C)
352 mbedtls_debug_set_threshold(opt.debug_level);
353 #endif
354
355 /*
356 * 2. Start the connection
357 */
358 mbedtls_printf(" . SSL connection to tcp/%s/%s...", opt.server_name,
359 opt.server_port);
360 fflush(stdout);
361
362 if ((ret = mbedtls_net_connect(&server_fd, opt.server_name,
363 opt.server_port, MBEDTLS_NET_PROTO_TCP)) != 0) {
364 mbedtls_printf(" failed\n ! mbedtls_net_connect returned %d\n\n", ret);
365 goto ssl_exit;
366 }
367
368 /*
369 * 3. Setup stuff
370 */
371 if ((ret = mbedtls_ssl_config_defaults(&conf,
372 MBEDTLS_SSL_IS_CLIENT,
373 MBEDTLS_SSL_TRANSPORT_STREAM,
374 MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
375 mbedtls_printf(" failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret);
376 goto exit;
377 }
378
379 if (verify) {
380 mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_REQUIRED);
381 mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
382 mbedtls_ssl_conf_verify(&conf, my_verify, NULL);
383 } else {
384 mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_NONE);
385 }
386
387 mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
388 mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
389
390 if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
391 mbedtls_printf(" failed\n ! mbedtls_ssl_setup returned %d\n\n", ret);
392 goto ssl_exit;
393 }
394
395 if ((ret = mbedtls_ssl_set_hostname(&ssl, opt.server_name)) != 0) {
396 mbedtls_printf(" failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret);
397 goto ssl_exit;
398 }
399
400 mbedtls_ssl_set_bio(&ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
401
402 /*
403 * 4. Handshake
404 */
405 while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
406 if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
407 mbedtls_printf(" failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret);
408 goto ssl_exit;
409 }
410 }
411
412 mbedtls_printf(" ok\n");
413
414 /*
415 * 5. Print the certificate
416 */
417 #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
418 mbedtls_printf(" . Peer certificate information ... skipped\n");
419 #else
420 mbedtls_printf(" . Peer certificate information ...\n");
421 ret = mbedtls_x509_crt_info((char *) buf, sizeof(buf) - 1, " ",
422 mbedtls_ssl_get_peer_cert(&ssl));
423 if (ret == -1) {
424 mbedtls_printf(" failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret);
425 goto ssl_exit;
426 }
427
428 mbedtls_printf("%s\n", buf);
429 #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
430
431 mbedtls_ssl_close_notify(&ssl);
432
433 ssl_exit:
434 mbedtls_ssl_free(&ssl);
435 mbedtls_ssl_config_free(&conf);
436 } else {
437 goto usage;
438 }
439
440 exit_code = MBEDTLS_EXIT_SUCCESS;
441
442 exit:
443
444 mbedtls_net_free(&server_fd);
445 mbedtls_x509_crt_free(&cacert);
446 #if defined(MBEDTLS_X509_CRL_PARSE_C)
447 mbedtls_x509_crl_free(&cacrl);
448 #endif
449 mbedtls_ctr_drbg_free(&ctr_drbg);
450 mbedtls_entropy_free(&entropy);
451
452 mbedtls_exit(exit_code);
453 }
454 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
455 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
456 MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
457
