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1 /**
2 * \file asn1.h
3 *
4 * \brief Generic ASN.1 parsing
5 */
6 /*
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: GPL-2.0
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 *
24 * This file is part of mbed TLS (https://tls.mbed.org)
25 */
26 #ifndef MBEDTLS_ASN1_H
27 #define MBEDTLS_ASN1_H
28
29 #if !defined(MBEDTLS_CONFIG_FILE)
30 #include "config.h"
31 #else
32 #include MBEDTLS_CONFIG_FILE
33 #endif
34
35 #include <stddef.h>
36
37 #if defined(MBEDTLS_BIGNUM_C)
38 #include "bignum.h"
39 #endif
40
41 /**
42 * \addtogroup asn1_module
43 * \{
44 */
45
46 /**
47 * \name ASN1 Error codes
48 * These error codes are OR'ed to X509 error codes for
49 * higher error granularity.
50 * ASN1 is a standard to specify data structures.
51 * \{
52 */
53 #define MBEDTLS_ERR_ASN1_OUT_OF_DATA -0x0060 /**< Out of data when parsing an ASN1 data structure. */
54 #define MBEDTLS_ERR_ASN1_UNEXPECTED_TAG -0x0062 /**< ASN1 tag was of an unexpected value. */
55 #define MBEDTLS_ERR_ASN1_INVALID_LENGTH -0x0064 /**< Error when trying to determine the length or invalid length. */
56 #define MBEDTLS_ERR_ASN1_LENGTH_MISMATCH -0x0066 /**< Actual length differs from expected length. */
57 #define MBEDTLS_ERR_ASN1_INVALID_DATA -0x0068 /**< Data is invalid. (not used) */
58 #define MBEDTLS_ERR_ASN1_ALLOC_FAILED -0x006A /**< Memory allocation failed */
59 #define MBEDTLS_ERR_ASN1_BUF_TOO_SMALL -0x006C /**< Buffer too small when writing ASN.1 data structure. */
60
61 /* \} name */
62
63 /**
64 * \name DER constants
65 * These constants comply with the DER encoded ASN.1 type tags.
66 * DER encoding uses hexadecimal representation.
67 * An example DER sequence is:\n
68 * - 0x02 -- tag indicating INTEGER
69 * - 0x01 -- length in octets
70 * - 0x05 -- value
71 * Such sequences are typically read into \c ::mbedtls_x509_buf.
72 * \{
73 */
74 #define MBEDTLS_ASN1_BOOLEAN 0x01
75 #define MBEDTLS_ASN1_INTEGER 0x02
76 #define MBEDTLS_ASN1_BIT_STRING 0x03
77 #define MBEDTLS_ASN1_OCTET_STRING 0x04
78 #define MBEDTLS_ASN1_NULL 0x05
79 #define MBEDTLS_ASN1_OID 0x06
80 #define MBEDTLS_ASN1_UTF8_STRING 0x0C
81 #define MBEDTLS_ASN1_SEQUENCE 0x10
82 #define MBEDTLS_ASN1_SET 0x11
83 #define MBEDTLS_ASN1_PRINTABLE_STRING 0x13
84 #define MBEDTLS_ASN1_T61_STRING 0x14
85 #define MBEDTLS_ASN1_IA5_STRING 0x16
86 #define MBEDTLS_ASN1_UTC_TIME 0x17
87 #define MBEDTLS_ASN1_GENERALIZED_TIME 0x18
88 #define MBEDTLS_ASN1_UNIVERSAL_STRING 0x1C
89 #define MBEDTLS_ASN1_BMP_STRING 0x1E
90 #define MBEDTLS_ASN1_PRIMITIVE 0x00
91 #define MBEDTLS_ASN1_CONSTRUCTED 0x20
92 #define MBEDTLS_ASN1_CONTEXT_SPECIFIC 0x80
93
94 /*
95 * Bit masks for each of the components of an ASN.1 tag as specified in
96 * ITU X.690 (08/2015), section 8.1 "General rules for encoding",
97 * paragraph 8.1.2.2:
98 *
99 * Bit 8 7 6 5 1
100 * +-------+-----+------------+
101 * | Class | P/C | Tag number |
102 * +-------+-----+------------+
103 */
104 #define MBEDTLS_ASN1_TAG_CLASS_MASK 0xC0
105 #define MBEDTLS_ASN1_TAG_PC_MASK 0x20
106 #define MBEDTLS_ASN1_TAG_VALUE_MASK 0x1F
107
108 /* \} name */
109 /* \} addtogroup asn1_module */
110
111 /** Returns the size of the binary string, without the trailing \\0 */
112 #define MBEDTLS_OID_SIZE(x) (sizeof(x) - 1)
113
114 /**
115 * Compares an mbedtls_asn1_buf structure to a reference OID.
116 *
117 * Only works for 'defined' oid_str values (MBEDTLS_OID_HMAC_SHA1), you cannot use a
118 * 'unsigned char *oid' here!
119 */
120 #define MBEDTLS_OID_CMP(oid_str, oid_buf) \
121 ( ( MBEDTLS_OID_SIZE(oid_str) != (oid_buf)->len ) || \
122 memcmp( (oid_str), (oid_buf)->p, (oid_buf)->len) != 0 )
123
124 #ifdef __cplusplus
125 extern "C" {
126 #endif
127
128 /**
129 * \name Functions to parse ASN.1 data structures
130 * \{
131 */
132
133 /**
134 * Type-length-value structure that allows for ASN1 using DER.
135 */
136 typedef struct mbedtls_asn1_buf
137 {
138 int tag; /**< ASN1 type, e.g. MBEDTLS_ASN1_UTF8_STRING. */
139 size_t len; /**< ASN1 length, in octets. */
140 unsigned char *p; /**< ASN1 data, e.g. in ASCII. */
141 }
142 mbedtls_asn1_buf;
143
144 /**
145 * Container for ASN1 bit strings.
146 */
147 typedef struct mbedtls_asn1_bitstring
148 {
149 size_t len; /**< ASN1 length, in octets. */
150 unsigned char unused_bits; /**< Number of unused bits at the end of the string */
151 unsigned char *p; /**< Raw ASN1 data for the bit string */
152 }
153 mbedtls_asn1_bitstring;
154
155 /**
156 * Container for a sequence of ASN.1 items
157 */
158 typedef struct mbedtls_asn1_sequence
159 {
160 mbedtls_asn1_buf buf; /**< Buffer containing the given ASN.1 item. */
161 struct mbedtls_asn1_sequence *next; /**< The next entry in the sequence. */
162 }
163 mbedtls_asn1_sequence;
164
165 /**
166 * Container for a sequence or list of 'named' ASN.1 data items
167 */
168 typedef struct mbedtls_asn1_named_data
169 {
170 mbedtls_asn1_buf oid; /**< The object identifier. */
171 mbedtls_asn1_buf val; /**< The named value. */
172 struct mbedtls_asn1_named_data *next; /**< The next entry in the sequence. */
173 unsigned char next_merged; /**< Merge next item into the current one? */
174 }
175 mbedtls_asn1_named_data;
176
177 /**
178 * \brief Get the length of an ASN.1 element.
179 * Updates the pointer to immediately behind the length.
180 *
181 * \param p The position in the ASN.1 data
182 * \param end End of data
183 * \param len The variable that will receive the value
184 *
185 * \return 0 if successful, MBEDTLS_ERR_ASN1_OUT_OF_DATA on reaching
186 * end of data, MBEDTLS_ERR_ASN1_INVALID_LENGTH if length is
187 * unparseable.
188 */
189 int mbedtls_asn1_get_len( unsigned char **p,
190 const unsigned char *end,
191 size_t *len );
192
193 /**
194 * \brief Get the tag and length of the tag. Check for the requested tag.
195 * Updates the pointer to immediately behind the tag and length.
196 *
197 * \param p The position in the ASN.1 data
198 * \param end End of data
199 * \param len The variable that will receive the length
200 * \param tag The expected tag
201 *
202 * \return 0 if successful, MBEDTLS_ERR_ASN1_UNEXPECTED_TAG if tag did
203 * not match requested tag, or another specific ASN.1 error code.
204 */
205 int mbedtls_asn1_get_tag( unsigned char **p,
206 const unsigned char *end,
207 size_t *len, int tag );
208
209 /**
210 * \brief Retrieve a boolean ASN.1 tag and its value.
211 * Updates the pointer to immediately behind the full tag.
212 *
213 * \param p The position in the ASN.1 data
214 * \param end End of data
215 * \param val The variable that will receive the value
216 *
217 * \return 0 if successful or a specific ASN.1 error code.
218 */
219 int mbedtls_asn1_get_bool( unsigned char **p,
220 const unsigned char *end,
221 int *val );
222
223 /**
224 * \brief Retrieve an integer ASN.1 tag and its value.
225 * Updates the pointer to immediately behind the full tag.
226 *
227 * \param p The position in the ASN.1 data
228 * \param end End of data
229 * \param val The variable that will receive the value
230 *
231 * \return 0 if successful or a specific ASN.1 error code.
232 */
233 int mbedtls_asn1_get_int( unsigned char **p,
234 const unsigned char *end,
235 int *val );
236
237 /**
238 * \brief Retrieve a bitstring ASN.1 tag and its value.
239 * Updates the pointer to immediately behind the full tag.
240 *
241 * \param p The position in the ASN.1 data
242 * \param end End of data
243 * \param bs The variable that will receive the value
244 *
245 * \return 0 if successful or a specific ASN.1 error code.
246 */
247 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
248 mbedtls_asn1_bitstring *bs);
249
250 /**
251 * \brief Retrieve a bitstring ASN.1 tag without unused bits and its
252 * value.
253 * Updates the pointer to the beginning of the bit/octet string.
254 *
255 * \param p The position in the ASN.1 data
256 * \param end End of data
257 * \param len Length of the actual bit/octect string in bytes
258 *
259 * \return 0 if successful or a specific ASN.1 error code.
260 */
261 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
262 size_t *len );
263
264 /**
265 * \brief Parses and splits an ASN.1 "SEQUENCE OF <tag>"
266 * Updated the pointer to immediately behind the full sequence tag.
267 *
268 * \param p The position in the ASN.1 data
269 * \param end End of data
270 * \param cur First variable in the chain to fill
271 * \param tag Type of sequence
272 *
273 * \return 0 if successful or a specific ASN.1 error code.
274 */
275 int mbedtls_asn1_get_sequence_of( unsigned char **p,
276 const unsigned char *end,
277 mbedtls_asn1_sequence *cur,
278 int tag);
279
280 #if defined(MBEDTLS_BIGNUM_C)
281 /**
282 * \brief Retrieve a MPI value from an integer ASN.1 tag.
283 * Updates the pointer to immediately behind the full tag.
284 *
285 * \param p The position in the ASN.1 data
286 * \param end End of data
287 * \param X The MPI that will receive the value
288 *
289 * \return 0 if successful or a specific ASN.1 or MPI error code.
290 */
291 int mbedtls_asn1_get_mpi( unsigned char **p,
292 const unsigned char *end,
293 mbedtls_mpi *X );
294 #endif /* MBEDTLS_BIGNUM_C */
295
296 /**
297 * \brief Retrieve an AlgorithmIdentifier ASN.1 sequence.
298 * Updates the pointer to immediately behind the full
299 * AlgorithmIdentifier.
300 *
301 * \param p The position in the ASN.1 data
302 * \param end End of data
303 * \param alg The buffer to receive the OID
304 * \param params The buffer to receive the params (if any)
305 *
306 * \return 0 if successful or a specific ASN.1 or MPI error code.
307 */
308 int mbedtls_asn1_get_alg( unsigned char **p,
309 const unsigned char *end,
310 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params );
311
312 /**
313 * \brief Retrieve an AlgorithmIdentifier ASN.1 sequence with NULL or no
314 * params.
315 * Updates the pointer to immediately behind the full
316 * AlgorithmIdentifier.
317 *
318 * \param p The position in the ASN.1 data
319 * \param end End of data
320 * \param alg The buffer to receive the OID
321 *
322 * \return 0 if successful or a specific ASN.1 or MPI error code.
323 */
324 int mbedtls_asn1_get_alg_null( unsigned char **p,
325 const unsigned char *end,
326 mbedtls_asn1_buf *alg );
327
328 /**
329 * \brief Find a specific named_data entry in a sequence or list based on
330 * the OID.
331 *
332 * \param list The list to seek through
333 * \param oid The OID to look for
334 * \param len Size of the OID
335 *
336 * \return NULL if not found, or a pointer to the existing entry.
337 */
338 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
339 const char *oid, size_t len );
340
341 /**
342 * \brief Free a mbedtls_asn1_named_data entry
343 *
344 * \param entry The named data entry to free
345 */
346 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *entry );
347
348 /**
349 * \brief Free all entries in a mbedtls_asn1_named_data list
350 * Head will be set to NULL
351 *
352 * \param head Pointer to the head of the list of named data entries to free
353 */
354 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head );
355
356 #ifdef __cplusplus
357 }
358 #endif
359
360 #endif /* asn1.h */
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