1 /*
2 * Certificate request generation
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21
22 #if !defined(MBEDTLS_CONFIG_FILE)
23 #include "mbedtls/config.h"
24 #else
25 #include MBEDTLS_CONFIG_FILE
26 #endif
27
28 #if defined(MBEDTLS_PLATFORM_C)
29 #include "mbedtls/platform.h"
30 #else
31 #include <stdio.h>
32 #define mbedtls_printf printf
33 #endif
34
35 #if !defined(MBEDTLS_X509_CSR_WRITE_C) || !defined(MBEDTLS_FS_IO) || \
36 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_SHA256_C) || \
37 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
38 !defined(MBEDTLS_PEM_WRITE_C)
main(void)39 int main( void )
40 {
41 mbedtls_printf( "MBEDTLS_X509_CSR_WRITE_C and/or MBEDTLS_FS_IO and/or "
42 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_SHA256_C and/or "
43 "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C "
44 "not defined.\n");
45 return( 0 );
46 }
47 #else
48
49 #include "mbedtls/x509_csr.h"
50 #include "mbedtls/entropy.h"
51 #include "mbedtls/ctr_drbg.h"
52 #include "mbedtls/error.h"
53
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57
58 #define DFL_FILENAME "keyfile.key"
59 #define DFL_DEBUG_LEVEL 0
60 #define DFL_OUTPUT_FILENAME "cert.req"
61 #define DFL_SUBJECT_NAME "CN=Cert,O=mbed TLS,C=UK"
62 #define DFL_KEY_USAGE 0
63 #define DFL_NS_CERT_TYPE 0
64
65 #define USAGE \
66 "\n usage: cert_req param=<>...\n" \
67 "\n acceptable parameters:\n" \
68 " filename=%%s default: keyfile.key\n" \
69 " debug_level=%%d default: 0 (disabled)\n" \
70 " output_file=%%s default: cert.req\n" \
71 " subject_name=%%s default: CN=Cert,O=mbed TLS,C=UK\n" \
72 " key_usage=%%s default: (empty)\n" \
73 " Comma-separated-list of values:\n" \
74 " digital_signature\n" \
75 " non_repudiation\n" \
76 " key_encipherment\n" \
77 " data_encipherment\n" \
78 " key_agreement\n" \
79 " key_cert_sign\n" \
80 " crl_sign\n" \
81 " ns_cert_type=%%s default: (empty)\n" \
82 " Comma-separated-list of values:\n" \
83 " ssl_client\n" \
84 " ssl_server\n" \
85 " email\n" \
86 " object_signing\n" \
87 " ssl_ca\n" \
88 " email_ca\n" \
89 " object_signing_ca\n" \
90 "\n"
91
92 /*
93 * global options
94 */
95 struct options
96 {
97 const char *filename; /* filename of the key file */
98 int debug_level; /* level of debugging */
99 const char *output_file; /* where to store the constructed key file */
100 const char *subject_name; /* subject name for certificate request */
101 unsigned char key_usage; /* key usage flags */
102 unsigned char ns_cert_type; /* NS cert type */
103 } opt;
104
write_certificate_request(mbedtls_x509write_csr * req,const char * output_file,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)105 int write_certificate_request( mbedtls_x509write_csr *req, const char *output_file,
106 int (*f_rng)(void *, unsigned char *, size_t),
107 void *p_rng )
108 {
109 int ret;
110 FILE *f;
111 unsigned char output_buf[4096];
112 size_t len = 0;
113
114 memset( output_buf, 0, 4096 );
115 if( ( ret = mbedtls_x509write_csr_pem( req, output_buf, 4096, f_rng, p_rng ) ) < 0 )
116 return( ret );
117
118 len = strlen( (char *) output_buf );
119
120 if( ( f = fopen( output_file, "w" ) ) == NULL )
121 return( -1 );
122
123 if( fwrite( output_buf, 1, len, f ) != len )
124 {
125 fclose( f );
126 return( -1 );
127 }
128
129 fclose( f );
130
131 return( 0 );
132 }
133
main(int argc,char * argv[])134 int main( int argc, char *argv[] )
135 {
136 int ret = 0;
137 mbedtls_pk_context key;
138 char buf[1024];
139 int i;
140 char *p, *q, *r;
141 mbedtls_x509write_csr req;
142 mbedtls_entropy_context entropy;
143 mbedtls_ctr_drbg_context ctr_drbg;
144 const char *pers = "csr example app";
145
146 /*
147 * Set to sane values
148 */
149 mbedtls_x509write_csr_init( &req );
150 mbedtls_x509write_csr_set_md_alg( &req, MBEDTLS_MD_SHA256 );
151 mbedtls_pk_init( &key );
152 mbedtls_ctr_drbg_init( &ctr_drbg );
153 memset( buf, 0, sizeof( buf ) );
154
155 if( argc == 0 )
156 {
157 usage:
158 mbedtls_printf( USAGE );
159 ret = 1;
160 goto exit;
161 }
162
163 opt.filename = DFL_FILENAME;
164 opt.debug_level = DFL_DEBUG_LEVEL;
165 opt.output_file = DFL_OUTPUT_FILENAME;
166 opt.subject_name = DFL_SUBJECT_NAME;
167 opt.key_usage = DFL_KEY_USAGE;
168 opt.ns_cert_type = DFL_NS_CERT_TYPE;
169
170 for( i = 1; i < argc; i++ )
171 {
172
173 p = argv[i];
174 if( ( q = strchr( p, '=' ) ) == NULL )
175 goto usage;
176 *q++ = '\0';
177
178 if( strcmp( p, "filename" ) == 0 )
179 opt.filename = q;
180 else if( strcmp( p, "output_file" ) == 0 )
181 opt.output_file = q;
182 else if( strcmp( p, "debug_level" ) == 0 )
183 {
184 opt.debug_level = atoi( q );
185 if( opt.debug_level < 0 || opt.debug_level > 65535 )
186 goto usage;
187 }
188 else if( strcmp( p, "subject_name" ) == 0 )
189 {
190 opt.subject_name = q;
191 }
192 else if( strcmp( p, "key_usage" ) == 0 )
193 {
194 while( q != NULL )
195 {
196 if( ( r = strchr( q, ',' ) ) != NULL )
197 *r++ = '\0';
198
199 if( strcmp( q, "digital_signature" ) == 0 )
200 opt.key_usage |= MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
201 else if( strcmp( q, "non_repudiation" ) == 0 )
202 opt.key_usage |= MBEDTLS_X509_KU_NON_REPUDIATION;
203 else if( strcmp( q, "key_encipherment" ) == 0 )
204 opt.key_usage |= MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
205 else if( strcmp( q, "data_encipherment" ) == 0 )
206 opt.key_usage |= MBEDTLS_X509_KU_DATA_ENCIPHERMENT;
207 else if( strcmp( q, "key_agreement" ) == 0 )
208 opt.key_usage |= MBEDTLS_X509_KU_KEY_AGREEMENT;
209 else if( strcmp( q, "key_cert_sign" ) == 0 )
210 opt.key_usage |= MBEDTLS_X509_KU_KEY_CERT_SIGN;
211 else if( strcmp( q, "crl_sign" ) == 0 )
212 opt.key_usage |= MBEDTLS_X509_KU_CRL_SIGN;
213 else
214 goto usage;
215
216 q = r;
217 }
218 }
219 else if( strcmp( p, "ns_cert_type" ) == 0 )
220 {
221 while( q != NULL )
222 {
223 if( ( r = strchr( q, ',' ) ) != NULL )
224 *r++ = '\0';
225
226 if( strcmp( q, "ssl_client" ) == 0 )
227 opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT;
228 else if( strcmp( q, "ssl_server" ) == 0 )
229 opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER;
230 else if( strcmp( q, "email" ) == 0 )
231 opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL;
232 else if( strcmp( q, "object_signing" ) == 0 )
233 opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING;
234 else if( strcmp( q, "ssl_ca" ) == 0 )
235 opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CA;
236 else if( strcmp( q, "email_ca" ) == 0 )
237 opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA;
238 else if( strcmp( q, "object_signing_ca" ) == 0 )
239 opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA;
240 else
241 goto usage;
242
243 q = r;
244 }
245 }
246 else
247 goto usage;
248 }
249
250 if( opt.key_usage )
251 mbedtls_x509write_csr_set_key_usage( &req, opt.key_usage );
252
253 if( opt.ns_cert_type )
254 mbedtls_x509write_csr_set_ns_cert_type( &req, opt.ns_cert_type );
255
256 /*
257 * 0. Seed the PRNG
258 */
259 mbedtls_printf( " . Seeding the random number generator..." );
260 fflush( stdout );
261
262 mbedtls_entropy_init( &entropy );
263 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
264 (const unsigned char *) pers,
265 strlen( pers ) ) ) != 0 )
266 {
267 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d", ret );
268 goto exit;
269 }
270
271 mbedtls_printf( " ok\n" );
272
273 /*
274 * 1.0. Check the subject name for validity
275 */
276 mbedtls_printf( " . Checking subject name..." );
277 fflush( stdout );
278
279 if( ( ret = mbedtls_x509write_csr_set_subject_name( &req, opt.subject_name ) ) != 0 )
280 {
281 mbedtls_printf( " failed\n ! mbedtls_x509write_csr_set_subject_name returned %d", ret );
282 goto exit;
283 }
284
285 mbedtls_printf( " ok\n" );
286
287 /*
288 * 1.1. Load the key
289 */
290 mbedtls_printf( " . Loading the private key ..." );
291 fflush( stdout );
292
293 ret = mbedtls_pk_parse_keyfile( &key, opt.filename, NULL );
294
295 if( ret != 0 )
296 {
297 mbedtls_printf( " failed\n ! mbedtls_pk_parse_keyfile returned %d", ret );
298 goto exit;
299 }
300
301 mbedtls_x509write_csr_set_key( &req, &key );
302
303 mbedtls_printf( " ok\n" );
304
305 /*
306 * 1.2. Writing the request
307 */
308 mbedtls_printf( " . Writing the certificate request ..." );
309 fflush( stdout );
310
311 if( ( ret = write_certificate_request( &req, opt.output_file,
312 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
313 {
314 mbedtls_printf( " failed\n ! write_certifcate_request %d", ret );
315 goto exit;
316 }
317
318 mbedtls_printf( " ok\n" );
319
320 exit:
321
322 if( ret != 0 && ret != 1)
323 {
324 #ifdef MBEDTLS_ERROR_C
325 mbedtls_strerror( ret, buf, sizeof( buf ) );
326 mbedtls_printf( " - %s\n", buf );
327 #else
328 mbedtls_printf("\n");
329 #endif
330 }
331
332 mbedtls_x509write_csr_free( &req );
333 mbedtls_pk_free( &key );
334 mbedtls_ctr_drbg_free( &ctr_drbg );
335 mbedtls_entropy_free( &entropy );
336
337 #if defined(_WIN32)
338 mbedtls_printf( " + Press Enter to exit this program.\n" );
339 fflush( stdout ); getchar();
340 #endif
341
342 return( ret );
343 }
344 #endif /* MBEDTLS_X509_CSR_WRITE_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
345 MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_WRITE_C */
346
