4 * \brief X.509 generic defines and structures
6 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
7 * SPDX-License-Identifier: Apache-2.0
9 * Licensed under the Apache License, Version 2.0 (the "License"); you may
10 * not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
13 * http://www.apache.org/licenses/LICENSE-2.0
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
17 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
21 * This file is part of mbed TLS (https://tls.mbed.org)
23 #ifndef MBEDTLS_X509_H
24 #define MBEDTLS_X509_H
26 #if !defined(MBEDTLS_CONFIG_FILE)
29 #include MBEDTLS_CONFIG_FILE
35 #if defined(MBEDTLS_RSA_C)
40 * \addtogroup x509_module
44 #if !defined(MBEDTLS_X509_MAX_INTERMEDIATE_CA)
46 * Maximum number of intermediate CAs in a verification chain.
47 * That is, maximum length of the chain, excluding the end-entity certificate
48 * and the trusted root certificate.
50 * Set this to a low value to prevent an adversary from making you waste
51 * resources verifying an overlong certificate chain.
53 #define MBEDTLS_X509_MAX_INTERMEDIATE_CA 8
57 * \name X509 Error codes
60 #define MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE -0x2080 /**< Unavailable feature, e.g. RSA hashing/encryption combination. */
61 #define MBEDTLS_ERR_X509_UNKNOWN_OID -0x2100 /**< Requested OID is unknown. */
62 #define MBEDTLS_ERR_X509_INVALID_FORMAT -0x2180 /**< The CRT/CRL/CSR format is invalid, e.g. different type expected. */
63 #define MBEDTLS_ERR_X509_INVALID_VERSION -0x2200 /**< The CRT/CRL/CSR version element is invalid. */
64 #define MBEDTLS_ERR_X509_INVALID_SERIAL -0x2280 /**< The serial tag or value is invalid. */
65 #define MBEDTLS_ERR_X509_INVALID_ALG -0x2300 /**< The algorithm tag or value is invalid. */
66 #define MBEDTLS_ERR_X509_INVALID_NAME -0x2380 /**< The name tag or value is invalid. */
67 #define MBEDTLS_ERR_X509_INVALID_DATE -0x2400 /**< The date tag or value is invalid. */
68 #define MBEDTLS_ERR_X509_INVALID_SIGNATURE -0x2480 /**< The signature tag or value invalid. */
69 #define MBEDTLS_ERR_X509_INVALID_EXTENSIONS -0x2500 /**< The extension tag or value is invalid. */
70 #define MBEDTLS_ERR_X509_UNKNOWN_VERSION -0x2580 /**< CRT/CRL/CSR has an unsupported version number. */
71 #define MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG -0x2600 /**< Signature algorithm (oid) is unsupported. */
72 #define MBEDTLS_ERR_X509_SIG_MISMATCH -0x2680 /**< Signature algorithms do not match. (see \c ::mbedtls_x509_crt sig_oid) */
73 #define MBEDTLS_ERR_X509_CERT_VERIFY_FAILED -0x2700 /**< Certificate verification failed, e.g. CRL, CA or signature check failed. */
74 #define MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT -0x2780 /**< Format not recognized as DER or PEM. */
75 #define MBEDTLS_ERR_X509_BAD_INPUT_DATA -0x2800 /**< Input invalid. */
76 #define MBEDTLS_ERR_X509_ALLOC_FAILED -0x2880 /**< Allocation of memory failed. */
77 #define MBEDTLS_ERR_X509_FILE_IO_ERROR -0x2900 /**< Read/write of file failed. */
78 #define MBEDTLS_ERR_X509_BUFFER_TOO_SMALL -0x2980 /**< Destination buffer is too small. */
82 * \name X509 Verify codes
85 /* Reminder: update x509_crt_verify_strings[] in library/x509_crt.c */
86 #define MBEDTLS_X509_BADCERT_EXPIRED 0x01 /**< The certificate validity has expired. */
87 #define MBEDTLS_X509_BADCERT_REVOKED 0x02 /**< The certificate has been revoked (is on a CRL). */
88 #define MBEDTLS_X509_BADCERT_CN_MISMATCH 0x04 /**< The certificate Common Name (CN) does not match with the expected CN. */
89 #define MBEDTLS_X509_BADCERT_NOT_TRUSTED 0x08 /**< The certificate is not correctly signed by the trusted CA. */
90 #define MBEDTLS_X509_BADCRL_NOT_TRUSTED 0x10 /**< The CRL is not correctly signed by the trusted CA. */
91 #define MBEDTLS_X509_BADCRL_EXPIRED 0x20 /**< The CRL is expired. */
92 #define MBEDTLS_X509_BADCERT_MISSING 0x40 /**< Certificate was missing. */
93 #define MBEDTLS_X509_BADCERT_SKIP_VERIFY 0x80 /**< Certificate verification was skipped. */
94 #define MBEDTLS_X509_BADCERT_OTHER 0x0100 /**< Other reason (can be used by verify callback) */
95 #define MBEDTLS_X509_BADCERT_FUTURE 0x0200 /**< The certificate validity starts in the future. */
96 #define MBEDTLS_X509_BADCRL_FUTURE 0x0400 /**< The CRL is from the future */
97 #define MBEDTLS_X509_BADCERT_KEY_USAGE 0x0800 /**< Usage does not match the keyUsage extension. */
98 #define MBEDTLS_X509_BADCERT_EXT_KEY_USAGE 0x1000 /**< Usage does not match the extendedKeyUsage extension. */
99 #define MBEDTLS_X509_BADCERT_NS_CERT_TYPE 0x2000 /**< Usage does not match the nsCertType extension. */
100 #define MBEDTLS_X509_BADCERT_BAD_MD 0x4000 /**< The certificate is signed with an unacceptable hash. */
101 #define MBEDTLS_X509_BADCERT_BAD_PK 0x8000 /**< The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
102 #define MBEDTLS_X509_BADCERT_BAD_KEY 0x010000 /**< The certificate is signed with an unacceptable key (eg bad curve, RSA too short). */
103 #define MBEDTLS_X509_BADCRL_BAD_MD 0x020000 /**< The CRL is signed with an unacceptable hash. */
104 #define MBEDTLS_X509_BADCRL_BAD_PK 0x040000 /**< The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
105 #define MBEDTLS_X509_BADCRL_BAD_KEY 0x080000 /**< The CRL is signed with an unacceptable key (eg bad curve, RSA too short). */
108 /* \} addtogroup x509_module */
111 * X.509 v3 Key Usage Extension flags
112 * Reminder: update x509_info_key_usage() when adding new flags.
114 #define MBEDTLS_X509_KU_DIGITAL_SIGNATURE (0x80) /* bit 0 */
115 #define MBEDTLS_X509_KU_NON_REPUDIATION (0x40) /* bit 1 */
116 #define MBEDTLS_X509_KU_KEY_ENCIPHERMENT (0x20) /* bit 2 */
117 #define MBEDTLS_X509_KU_DATA_ENCIPHERMENT (0x10) /* bit 3 */
118 #define MBEDTLS_X509_KU_KEY_AGREEMENT (0x08) /* bit 4 */
119 #define MBEDTLS_X509_KU_KEY_CERT_SIGN (0x04) /* bit 5 */
120 #define MBEDTLS_X509_KU_CRL_SIGN (0x02) /* bit 6 */
121 #define MBEDTLS_X509_KU_ENCIPHER_ONLY (0x01) /* bit 7 */
122 #define MBEDTLS_X509_KU_DECIPHER_ONLY (0x8000) /* bit 8 */
125 * Netscape certificate types
126 * (http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html)
129 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT (0x80) /* bit 0 */
130 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER (0x40) /* bit 1 */
131 #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL (0x20) /* bit 2 */
132 #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING (0x10) /* bit 3 */
133 #define MBEDTLS_X509_NS_CERT_TYPE_RESERVED (0x08) /* bit 4 */
134 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CA (0x04) /* bit 5 */
135 #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA (0x02) /* bit 6 */
136 #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA (0x01) /* bit 7 */
139 * X.509 extension types
141 * Comments refer to the status for using certificates. Status can be
142 * different for writing certificates or reading CRLs or CSRs.
144 #define MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER (1 << 0)
145 #define MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER (1 << 1)
146 #define MBEDTLS_X509_EXT_KEY_USAGE (1 << 2)
147 #define MBEDTLS_X509_EXT_CERTIFICATE_POLICIES (1 << 3)
148 #define MBEDTLS_X509_EXT_POLICY_MAPPINGS (1 << 4)
149 #define MBEDTLS_X509_EXT_SUBJECT_ALT_NAME (1 << 5) /* Supported (DNS) */
150 #define MBEDTLS_X509_EXT_ISSUER_ALT_NAME (1 << 6)
151 #define MBEDTLS_X509_EXT_SUBJECT_DIRECTORY_ATTRS (1 << 7)
152 #define MBEDTLS_X509_EXT_BASIC_CONSTRAINTS (1 << 8) /* Supported */
153 #define MBEDTLS_X509_EXT_NAME_CONSTRAINTS (1 << 9)
154 #define MBEDTLS_X509_EXT_POLICY_CONSTRAINTS (1 << 10)
155 #define MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE (1 << 11)
156 #define MBEDTLS_X509_EXT_CRL_DISTRIBUTION_POINTS (1 << 12)
157 #define MBEDTLS_X509_EXT_INIHIBIT_ANYPOLICY (1 << 13)
158 #define MBEDTLS_X509_EXT_FRESHEST_CRL (1 << 14)
160 #define MBEDTLS_X509_EXT_NS_CERT_TYPE (1 << 16) /* Parsed (and then ?) */
163 * Storage format identifiers
164 * Recognized formats: PEM and DER
166 #define MBEDTLS_X509_FORMAT_DER 1
167 #define MBEDTLS_X509_FORMAT_PEM 2
169 #define MBEDTLS_X509_MAX_DN_NAME_SIZE 256 /**< Maximum value size of a DN entry */
176 * \addtogroup x509_module
180 * \name Structures for parsing X.509 certificates, CRLs and CSRs
185 * Type-length-value structure that allows for ASN1 using DER.
187 typedef mbedtls_asn1_buf mbedtls_x509_buf;
190 * Container for ASN1 bit strings.
192 typedef mbedtls_asn1_bitstring mbedtls_x509_bitstring;
195 * Container for ASN1 named information objects.
196 * It allows for Relative Distinguished Names (e.g. cn=localhost,ou=code,etc.).
198 typedef mbedtls_asn1_named_data mbedtls_x509_name;
201 * Container for a sequence of ASN.1 items
203 typedef mbedtls_asn1_sequence mbedtls_x509_sequence;
205 /** Container for date and time (precision in seconds). */
206 typedef struct mbedtls_x509_time
208 int year, mon, day; /**< Date. */
209 int hour, min, sec; /**< Time. */
213 /** \} name Structures for parsing X.509 certificates, CRLs and CSRs */
214 /** \} addtogroup x509_module */
217 * \brief Store the certificate DN in printable form into buf;
218 * no more than size characters will be written.
220 * \param buf Buffer to write to
221 * \param size Maximum size of buffer
222 * \param dn The X509 name to represent
224 * \return The length of the string written (not including the
225 * terminated nul byte), or a negative error code.
227 int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn );
230 * \brief Store the certificate serial in printable form into buf;
231 * no more than size characters will be written.
233 * \param buf Buffer to write to
234 * \param size Maximum size of buffer
235 * \param serial The X509 serial to represent
237 * \return The length of the string written (not including the
238 * terminated nul byte), or a negative error code.
240 int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial );
243 * \brief Check a given mbedtls_x509_time against the system time
244 * and tell if it's in the past.
246 * \note Intended usage is "if( is_past( valid_to ) ) ERROR".
247 * Hence the return value of 1 if on internal errors.
249 * \param time mbedtls_x509_time to check
251 * \return 1 if the given time is in the past or an error occured,
254 int mbedtls_x509_time_is_past( const mbedtls_x509_time *time );
257 * \brief Check a given mbedtls_x509_time against the system time
258 * and tell if it's in the future.
260 * \note Intended usage is "if( is_future( valid_from ) ) ERROR".
261 * Hence the return value of 1 if on internal errors.
263 * \param time mbedtls_x509_time to check
265 * \return 1 if the given time is in the future or an error occured,
268 int mbedtls_x509_time_is_future( const mbedtls_x509_time *time );
271 * \brief Checkup routine
273 * \return 0 if successful, or 1 if the test failed
275 int mbedtls_x509_self_test( int verbose );
278 * Internal module functions. You probably do not want to use these unless you
281 int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
282 mbedtls_x509_name *cur );
283 int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end,
284 mbedtls_x509_buf *alg );
285 int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
286 mbedtls_x509_buf *alg, mbedtls_x509_buf *params );
287 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
288 int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params,
289 mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
292 int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig );
293 int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
294 mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
296 int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
297 mbedtls_x509_time *time );
298 int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
299 mbedtls_x509_buf *serial );
300 int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
301 mbedtls_x509_buf *ext, int tag );
302 int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
303 mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
304 const void *sig_opts );
305 int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name );
306 int mbedtls_x509_string_to_names( mbedtls_asn1_named_data **head, const char *name );
307 int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
308 int critical, const unsigned char *val,
310 int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start,
311 mbedtls_asn1_named_data *first );
312 int mbedtls_x509_write_names( unsigned char **p, unsigned char *start,
313 mbedtls_asn1_named_data *first );
314 int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start,
315 const char *oid, size_t oid_len,
316 unsigned char *sig, size_t size );
318 #define MBEDTLS_X509_SAFE_SNPRINTF \
320 if( ret < 0 || (size_t) ret >= n ) \
321 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); \