source: azure_iot_hub_mbedtls/trunk/mbedtls-2.16.1/library/x509_csr.c@ 398

Last change on this file since 398 was 398, checked in by coas-nagasima, 5 years ago

mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
  • Property svn:eol-style set to native
  • Property svn:mime-type set to text/x-csrc;charset=UTF-8
File size: 10.9 KB
Line 
1/*
2 * X.509 Certificate Signing Request (CSR) parsing
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 * The ITU-T X.509 standard defines a certificate format for PKI.
23 *
24 * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
25 * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
26 * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
27 *
28 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
29 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
30 */
31
32#if !defined(MBEDTLS_CONFIG_FILE)
33#include "mbedtls/config.h"
34#else
35#include MBEDTLS_CONFIG_FILE
36#endif
37
38#if defined(MBEDTLS_X509_CSR_PARSE_C)
39
40#include "mbedtls/x509_csr.h"
41#include "mbedtls/oid.h"
42#include "mbedtls/platform_util.h"
43
44#include <string.h>
45
46#if defined(MBEDTLS_PEM_PARSE_C)
47#include "mbedtls/pem.h"
48#endif
49
50#if defined(MBEDTLS_PLATFORM_C)
51#include "mbedtls/platform.h"
52#else
53#include <stdlib.h>
54#include <stdio.h>
55#define mbedtls_free free
56#define mbedtls_calloc calloc
57#define mbedtls_snprintf snprintf
58#endif
59
60#if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32)
61#include <stdio.h>
62#endif
63
64/*
65 * Version ::= INTEGER { v1(0) }
66 */
67static int x509_csr_get_version( unsigned char **p,
68 const unsigned char *end,
69 int *ver )
70{
71 int ret;
72
73 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
74 {
75 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
76 {
77 *ver = 0;
78 return( 0 );
79 }
80
81 return( MBEDTLS_ERR_X509_INVALID_VERSION + ret );
82 }
83
84 return( 0 );
85}
86
87/*
88 * Parse a CSR in DER format
89 */
90int mbedtls_x509_csr_parse_der( mbedtls_x509_csr *csr,
91 const unsigned char *buf, size_t buflen )
92{
93 int ret;
94 size_t len;
95 unsigned char *p, *end;
96 mbedtls_x509_buf sig_params;
97
98 memset( &sig_params, 0, sizeof( mbedtls_x509_buf ) );
99
100 /*
101 * Check for valid input
102 */
103 if( csr == NULL || buf == NULL || buflen == 0 )
104 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
105
106 mbedtls_x509_csr_init( csr );
107
108 /*
109 * first copy the raw DER data
110 */
111 p = mbedtls_calloc( 1, len = buflen );
112
113 if( p == NULL )
114 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
115
116 memcpy( p, buf, buflen );
117
118 csr->raw.p = p;
119 csr->raw.len = len;
120 end = p + len;
121
122 /*
123 * CertificationRequest ::= SEQUENCE {
124 * certificationRequestInfo CertificationRequestInfo,
125 * signatureAlgorithm AlgorithmIdentifier,
126 * signature BIT STRING
127 * }
128 */
129 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
130 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
131 {
132 mbedtls_x509_csr_free( csr );
133 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
134 }
135
136 if( len != (size_t) ( end - p ) )
137 {
138 mbedtls_x509_csr_free( csr );
139 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
140 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
141 }
142
143 /*
144 * CertificationRequestInfo ::= SEQUENCE {
145 */
146 csr->cri.p = p;
147
148 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
149 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
150 {
151 mbedtls_x509_csr_free( csr );
152 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
153 }
154
155 end = p + len;
156 csr->cri.len = end - csr->cri.p;
157
158 /*
159 * Version ::= INTEGER { v1(0) }
160 */
161 if( ( ret = x509_csr_get_version( &p, end, &csr->version ) ) != 0 )
162 {
163 mbedtls_x509_csr_free( csr );
164 return( ret );
165 }
166
167 if( csr->version != 0 )
168 {
169 mbedtls_x509_csr_free( csr );
170 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
171 }
172
173 csr->version++;
174
175 /*
176 * subject Name
177 */
178 csr->subject_raw.p = p;
179
180 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
181 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
182 {
183 mbedtls_x509_csr_free( csr );
184 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
185 }
186
187 if( ( ret = mbedtls_x509_get_name( &p, p + len, &csr->subject ) ) != 0 )
188 {
189 mbedtls_x509_csr_free( csr );
190 return( ret );
191 }
192
193 csr->subject_raw.len = p - csr->subject_raw.p;
194
195 /*
196 * subjectPKInfo SubjectPublicKeyInfo
197 */
198 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &csr->pk ) ) != 0 )
199 {
200 mbedtls_x509_csr_free( csr );
201 return( ret );
202 }
203
204 /*
205 * attributes [0] Attributes
206 *
207 * The list of possible attributes is open-ended, though RFC 2985
208 * (PKCS#9) defines a few in section 5.4. We currently don't support any,
209 * so we just ignore them. This is a safe thing to do as the worst thing
210 * that could happen is that we issue a certificate that does not match
211 * the requester's expectations - this cannot cause a violation of our
212 * signature policies.
213 */
214 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
215 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ) != 0 )
216 {
217 mbedtls_x509_csr_free( csr );
218 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
219 }
220
221 p += len;
222
223 end = csr->raw.p + csr->raw.len;
224
225 /*
226 * signatureAlgorithm AlgorithmIdentifier,
227 * signature BIT STRING
228 */
229 if( ( ret = mbedtls_x509_get_alg( &p, end, &csr->sig_oid, &sig_params ) ) != 0 )
230 {
231 mbedtls_x509_csr_free( csr );
232 return( ret );
233 }
234
235 if( ( ret = mbedtls_x509_get_sig_alg( &csr->sig_oid, &sig_params,
236 &csr->sig_md, &csr->sig_pk,
237 &csr->sig_opts ) ) != 0 )
238 {
239 mbedtls_x509_csr_free( csr );
240 return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG );
241 }
242
243 if( ( ret = mbedtls_x509_get_sig( &p, end, &csr->sig ) ) != 0 )
244 {
245 mbedtls_x509_csr_free( csr );
246 return( ret );
247 }
248
249 if( p != end )
250 {
251 mbedtls_x509_csr_free( csr );
252 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
253 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
254 }
255
256 return( 0 );
257}
258
259/*
260 * Parse a CSR, allowing for PEM or raw DER encoding
261 */
262int mbedtls_x509_csr_parse( mbedtls_x509_csr *csr, const unsigned char *buf, size_t buflen )
263{
264#if defined(MBEDTLS_PEM_PARSE_C)
265 int ret;
266 size_t use_len;
267 mbedtls_pem_context pem;
268#endif
269
270 /*
271 * Check for valid input
272 */
273 if( csr == NULL || buf == NULL || buflen == 0 )
274 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
275
276#if defined(MBEDTLS_PEM_PARSE_C)
277 /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
278 if( buf[buflen - 1] == '\0' )
279 {
280 mbedtls_pem_init( &pem );
281 ret = mbedtls_pem_read_buffer( &pem,
282 "-----BEGIN CERTIFICATE REQUEST-----",
283 "-----END CERTIFICATE REQUEST-----",
284 buf, NULL, 0, &use_len );
285 if( ret == MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
286 {
287 ret = mbedtls_pem_read_buffer( &pem,
288 "-----BEGIN NEW CERTIFICATE REQUEST-----",
289 "-----END NEW CERTIFICATE REQUEST-----",
290 buf, NULL, 0, &use_len );
291 }
292
293 if( ret == 0 )
294 {
295 /*
296 * Was PEM encoded, parse the result
297 */
298 ret = mbedtls_x509_csr_parse_der( csr, pem.buf, pem.buflen );
299 }
300
301 mbedtls_pem_free( &pem );
302 if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
303 return( ret );
304 }
305#endif /* MBEDTLS_PEM_PARSE_C */
306 return( mbedtls_x509_csr_parse_der( csr, buf, buflen ) );
307}
308
309#if defined(MBEDTLS_FS_IO)
310/*
311 * Load a CSR into the structure
312 */
313int mbedtls_x509_csr_parse_file( mbedtls_x509_csr *csr, const char *path )
314{
315 int ret;
316 size_t n;
317 unsigned char *buf;
318
319 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
320 return( ret );
321
322 ret = mbedtls_x509_csr_parse( csr, buf, n );
323
324 mbedtls_platform_zeroize( buf, n );
325 mbedtls_free( buf );
326
327 return( ret );
328}
329#endif /* MBEDTLS_FS_IO */
330
331#define BEFORE_COLON 14
332#define BC "14"
333/*
334 * Return an informational string about the CSR.
335 */
336int mbedtls_x509_csr_info( char *buf, size_t size, const char *prefix,
337 const mbedtls_x509_csr *csr )
338{
339 int ret;
340 size_t n;
341 char *p;
342 char key_size_str[BEFORE_COLON];
343
344 p = buf;
345 n = size;
346
347 ret = mbedtls_snprintf( p, n, "%sCSR version : %d",
348 prefix, csr->version );
349 MBEDTLS_X509_SAFE_SNPRINTF;
350
351 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
352 MBEDTLS_X509_SAFE_SNPRINTF;
353 ret = mbedtls_x509_dn_gets( p, n, &csr->subject );
354 MBEDTLS_X509_SAFE_SNPRINTF;
355
356 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
357 MBEDTLS_X509_SAFE_SNPRINTF;
358
359 ret = mbedtls_x509_sig_alg_gets( p, n, &csr->sig_oid, csr->sig_pk, csr->sig_md,
360 csr->sig_opts );
361 MBEDTLS_X509_SAFE_SNPRINTF;
362
363 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
364 mbedtls_pk_get_name( &csr->pk ) ) ) != 0 )
365 {
366 return( ret );
367 }
368
369 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str,
370 (int) mbedtls_pk_get_bitlen( &csr->pk ) );
371 MBEDTLS_X509_SAFE_SNPRINTF;
372
373 return( (int) ( size - n ) );
374}
375
376/*
377 * Initialize a CSR
378 */
379void mbedtls_x509_csr_init( mbedtls_x509_csr *csr )
380{
381 memset( csr, 0, sizeof(mbedtls_x509_csr) );
382}
383
384/*
385 * Unallocate all CSR data
386 */
387void mbedtls_x509_csr_free( mbedtls_x509_csr *csr )
388{
389 mbedtls_x509_name *name_cur;
390 mbedtls_x509_name *name_prv;
391
392 if( csr == NULL )
393 return;
394
395 mbedtls_pk_free( &csr->pk );
396
397#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
398 mbedtls_free( csr->sig_opts );
399#endif
400
401 name_cur = csr->subject.next;
402 while( name_cur != NULL )
403 {
404 name_prv = name_cur;
405 name_cur = name_cur->next;
406 mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
407 mbedtls_free( name_prv );
408 }
409
410 if( csr->raw.p != NULL )
411 {
412 mbedtls_platform_zeroize( csr->raw.p, csr->raw.len );
413 mbedtls_free( csr->raw.p );
414 }
415
416 mbedtls_platform_zeroize( csr, sizeof( mbedtls_x509_csr ) );
417}
418
419#endif /* MBEDTLS_X509_CSR_PARSE_C */
Note: See TracBrowser for help on using the repository browser.