4 * \brief X.509 generic defines and structures
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: Apache-2.0
10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
11 * not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
14 * http://www.apache.org/licenses/LICENSE-2.0
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
22 * This file is part of mbed TLS (https://tls.mbed.org)
24 #ifndef MBEDTLS_X509_H
25 #define MBEDTLS_X509_H
27 #if !defined(MBEDTLS_CONFIG_FILE)
30 #include MBEDTLS_CONFIG_FILE
36 #if defined(MBEDTLS_RSA_C)
41 * \addtogroup x509_module
45 #if !defined(MBEDTLS_X509_MAX_INTERMEDIATE_CA)
47 * Maximum number of intermediate CAs in a verification chain.
48 * That is, maximum length of the chain, excluding the end-entity certificate
49 * and the trusted root certificate.
51 * Set this to a low value to prevent an adversary from making you waste
52 * resources verifying an overlong certificate chain.
54 #define MBEDTLS_X509_MAX_INTERMEDIATE_CA 8
58 * \name X509 Error codes
61 #define MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE -0x2080 /**< Unavailable feature, e.g. RSA hashing/encryption combination. */
62 #define MBEDTLS_ERR_X509_UNKNOWN_OID -0x2100 /**< Requested OID is unknown. */
63 #define MBEDTLS_ERR_X509_INVALID_FORMAT -0x2180 /**< The CRT/CRL/CSR format is invalid, e.g. different type expected. */
64 #define MBEDTLS_ERR_X509_INVALID_VERSION -0x2200 /**< The CRT/CRL/CSR version element is invalid. */
65 #define MBEDTLS_ERR_X509_INVALID_SERIAL -0x2280 /**< The serial tag or value is invalid. */
66 #define MBEDTLS_ERR_X509_INVALID_ALG -0x2300 /**< The algorithm tag or value is invalid. */
67 #define MBEDTLS_ERR_X509_INVALID_NAME -0x2380 /**< The name tag or value is invalid. */
68 #define MBEDTLS_ERR_X509_INVALID_DATE -0x2400 /**< The date tag or value is invalid. */
69 #define MBEDTLS_ERR_X509_INVALID_SIGNATURE -0x2480 /**< The signature tag or value invalid. */
70 #define MBEDTLS_ERR_X509_INVALID_EXTENSIONS -0x2500 /**< The extension tag or value is invalid. */
71 #define MBEDTLS_ERR_X509_UNKNOWN_VERSION -0x2580 /**< CRT/CRL/CSR has an unsupported version number. */
72 #define MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG -0x2600 /**< Signature algorithm (oid) is unsupported. */
73 #define MBEDTLS_ERR_X509_SIG_MISMATCH -0x2680 /**< Signature algorithms do not match. (see \c ::mbedtls_x509_crt sig_oid) */
74 #define MBEDTLS_ERR_X509_CERT_VERIFY_FAILED -0x2700 /**< Certificate verification failed, e.g. CRL, CA or signature check failed. */
75 #define MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT -0x2780 /**< Format not recognized as DER or PEM. */
76 #define MBEDTLS_ERR_X509_BAD_INPUT_DATA -0x2800 /**< Input invalid. */
77 #define MBEDTLS_ERR_X509_ALLOC_FAILED -0x2880 /**< Allocation of memory failed. */
78 #define MBEDTLS_ERR_X509_FILE_IO_ERROR -0x2900 /**< Read/write of file failed. */
79 #define MBEDTLS_ERR_X509_BUFFER_TOO_SMALL -0x2980 /**< Destination buffer is too small. */
80 #define MBEDTLS_ERR_X509_FATAL_ERROR -0x3000 /**< A fatal error occurred, eg the chain is too long or the vrfy callback failed. */
84 * \name X509 Verify codes
87 /* Reminder: update x509_crt_verify_strings[] in library/x509_crt.c */
88 #define MBEDTLS_X509_BADCERT_EXPIRED 0x01 /**< The certificate validity has expired. */
89 #define MBEDTLS_X509_BADCERT_REVOKED 0x02 /**< The certificate has been revoked (is on a CRL). */
90 #define MBEDTLS_X509_BADCERT_CN_MISMATCH 0x04 /**< The certificate Common Name (CN) does not match with the expected CN. */
91 #define MBEDTLS_X509_BADCERT_NOT_TRUSTED 0x08 /**< The certificate is not correctly signed by the trusted CA. */
92 #define MBEDTLS_X509_BADCRL_NOT_TRUSTED 0x10 /**< The CRL is not correctly signed by the trusted CA. */
93 #define MBEDTLS_X509_BADCRL_EXPIRED 0x20 /**< The CRL is expired. */
94 #define MBEDTLS_X509_BADCERT_MISSING 0x40 /**< Certificate was missing. */
95 #define MBEDTLS_X509_BADCERT_SKIP_VERIFY 0x80 /**< Certificate verification was skipped. */
96 #define MBEDTLS_X509_BADCERT_OTHER 0x0100 /**< Other reason (can be used by verify callback) */
97 #define MBEDTLS_X509_BADCERT_FUTURE 0x0200 /**< The certificate validity starts in the future. */
98 #define MBEDTLS_X509_BADCRL_FUTURE 0x0400 /**< The CRL is from the future */
99 #define MBEDTLS_X509_BADCERT_KEY_USAGE 0x0800 /**< Usage does not match the keyUsage extension. */
100 #define MBEDTLS_X509_BADCERT_EXT_KEY_USAGE 0x1000 /**< Usage does not match the extendedKeyUsage extension. */
101 #define MBEDTLS_X509_BADCERT_NS_CERT_TYPE 0x2000 /**< Usage does not match the nsCertType extension. */
102 #define MBEDTLS_X509_BADCERT_BAD_MD 0x4000 /**< The certificate is signed with an unacceptable hash. */
103 #define MBEDTLS_X509_BADCERT_BAD_PK 0x8000 /**< The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
104 #define MBEDTLS_X509_BADCERT_BAD_KEY 0x010000 /**< The certificate is signed with an unacceptable key (eg bad curve, RSA too short). */
105 #define MBEDTLS_X509_BADCRL_BAD_MD 0x020000 /**< The CRL is signed with an unacceptable hash. */
106 #define MBEDTLS_X509_BADCRL_BAD_PK 0x040000 /**< The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
107 #define MBEDTLS_X509_BADCRL_BAD_KEY 0x080000 /**< The CRL is signed with an unacceptable key (eg bad curve, RSA too short). */
110 /* \} addtogroup x509_module */
113 * X.509 v3 Subject Alternative Name types.
114 * otherName [0] OtherName,
115 * rfc822Name [1] IA5String,
116 * dNSName [2] IA5String,
117 * x400Address [3] ORAddress,
118 * directoryName [4] Name,
119 * ediPartyName [5] EDIPartyName,
120 * uniformResourceIdentifier [6] IA5String,
121 * iPAddress [7] OCTET STRING,
122 * registeredID [8] OBJECT IDENTIFIER
124 #define MBEDTLS_X509_SAN_OTHER_NAME 0
125 #define MBEDTLS_X509_SAN_RFC822_NAME 1
126 #define MBEDTLS_X509_SAN_DNS_NAME 2
127 #define MBEDTLS_X509_SAN_X400_ADDRESS_NAME 3
128 #define MBEDTLS_X509_SAN_DIRECTORY_NAME 4
129 #define MBEDTLS_X509_SAN_EDI_PARTY_NAME 5
130 #define MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER 6
131 #define MBEDTLS_X509_SAN_IP_ADDRESS 7
132 #define MBEDTLS_X509_SAN_REGISTERED_ID 8
135 * X.509 v3 Key Usage Extension flags
136 * Reminder: update x509_info_key_usage() when adding new flags.
138 #define MBEDTLS_X509_KU_DIGITAL_SIGNATURE (0x80) /* bit 0 */
139 #define MBEDTLS_X509_KU_NON_REPUDIATION (0x40) /* bit 1 */
140 #define MBEDTLS_X509_KU_KEY_ENCIPHERMENT (0x20) /* bit 2 */
141 #define MBEDTLS_X509_KU_DATA_ENCIPHERMENT (0x10) /* bit 3 */
142 #define MBEDTLS_X509_KU_KEY_AGREEMENT (0x08) /* bit 4 */
143 #define MBEDTLS_X509_KU_KEY_CERT_SIGN (0x04) /* bit 5 */
144 #define MBEDTLS_X509_KU_CRL_SIGN (0x02) /* bit 6 */
145 #define MBEDTLS_X509_KU_ENCIPHER_ONLY (0x01) /* bit 7 */
146 #define MBEDTLS_X509_KU_DECIPHER_ONLY (0x8000) /* bit 8 */
149 * Netscape certificate types
150 * (http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html)
153 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT (0x80) /* bit 0 */
154 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER (0x40) /* bit 1 */
155 #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL (0x20) /* bit 2 */
156 #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING (0x10) /* bit 3 */
157 #define MBEDTLS_X509_NS_CERT_TYPE_RESERVED (0x08) /* bit 4 */
158 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CA (0x04) /* bit 5 */
159 #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA (0x02) /* bit 6 */
160 #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA (0x01) /* bit 7 */
163 * X.509 extension types
165 * Comments refer to the status for using certificates. Status can be
166 * different for writing certificates or reading CRLs or CSRs.
168 * Those are defined in oid.h as oid.c needs them in a data structure. Since
169 * these were previously defined here, let's have aliases for compatibility.
171 #define MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER MBEDTLS_OID_X509_EXT_AUTHORITY_KEY_IDENTIFIER
172 #define MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER MBEDTLS_OID_X509_EXT_SUBJECT_KEY_IDENTIFIER
173 #define MBEDTLS_X509_EXT_KEY_USAGE MBEDTLS_OID_X509_EXT_KEY_USAGE
174 #define MBEDTLS_X509_EXT_CERTIFICATE_POLICIES MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES
175 #define MBEDTLS_X509_EXT_POLICY_MAPPINGS MBEDTLS_OID_X509_EXT_POLICY_MAPPINGS
176 #define MBEDTLS_X509_EXT_SUBJECT_ALT_NAME MBEDTLS_OID_X509_EXT_SUBJECT_ALT_NAME /* Supported (DNS) */
177 #define MBEDTLS_X509_EXT_ISSUER_ALT_NAME MBEDTLS_OID_X509_EXT_ISSUER_ALT_NAME
178 #define MBEDTLS_X509_EXT_SUBJECT_DIRECTORY_ATTRS MBEDTLS_OID_X509_EXT_SUBJECT_DIRECTORY_ATTRS
179 #define MBEDTLS_X509_EXT_BASIC_CONSTRAINTS MBEDTLS_OID_X509_EXT_BASIC_CONSTRAINTS /* Supported */
180 #define MBEDTLS_X509_EXT_NAME_CONSTRAINTS MBEDTLS_OID_X509_EXT_NAME_CONSTRAINTS
181 #define MBEDTLS_X509_EXT_POLICY_CONSTRAINTS MBEDTLS_OID_X509_EXT_POLICY_CONSTRAINTS
182 #define MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE MBEDTLS_OID_X509_EXT_EXTENDED_KEY_USAGE
183 #define MBEDTLS_X509_EXT_CRL_DISTRIBUTION_POINTS MBEDTLS_OID_X509_EXT_CRL_DISTRIBUTION_POINTS
184 #define MBEDTLS_X509_EXT_INIHIBIT_ANYPOLICY MBEDTLS_OID_X509_EXT_INIHIBIT_ANYPOLICY
185 #define MBEDTLS_X509_EXT_FRESHEST_CRL MBEDTLS_OID_X509_EXT_FRESHEST_CRL
186 #define MBEDTLS_X509_EXT_NS_CERT_TYPE MBEDTLS_OID_X509_EXT_NS_CERT_TYPE
189 * Storage format identifiers
190 * Recognized formats: PEM and DER
192 #define MBEDTLS_X509_FORMAT_DER 1
193 #define MBEDTLS_X509_FORMAT_PEM 2
195 #define MBEDTLS_X509_MAX_DN_NAME_SIZE 256 /**< Maximum value size of a DN entry */
202 * \addtogroup x509_module
206 * \name Structures for parsing X.509 certificates, CRLs and CSRs
211 * Type-length-value structure that allows for ASN1 using DER.
213 typedef mbedtls_asn1_buf mbedtls_x509_buf;
216 * Container for ASN1 bit strings.
218 typedef mbedtls_asn1_bitstring mbedtls_x509_bitstring;
221 * Container for ASN1 named information objects.
222 * It allows for Relative Distinguished Names (e.g. cn=localhost,ou=code,etc.).
224 typedef mbedtls_asn1_named_data mbedtls_x509_name;
227 * Container for a sequence of ASN.1 items
229 typedef mbedtls_asn1_sequence mbedtls_x509_sequence;
231 /** Container for date and time (precision in seconds). */
232 typedef struct mbedtls_x509_time
234 int year, mon, day; /**< Date. */
235 int hour, min, sec; /**< Time. */
239 /** \} name Structures for parsing X.509 certificates, CRLs and CSRs */
240 /** \} addtogroup x509_module */
243 * \brief Store the certificate DN in printable form into buf;
244 * no more than size characters will be written.
246 * \param buf Buffer to write to
247 * \param size Maximum size of buffer
248 * \param dn The X509 name to represent
250 * \return The length of the string written (not including the
251 * terminated nul byte), or a negative error code.
253 int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn );
256 * \brief Store the certificate serial in printable form into buf;
257 * no more than size characters will be written.
259 * \param buf Buffer to write to
260 * \param size Maximum size of buffer
261 * \param serial The X509 serial to represent
263 * \return The length of the string written (not including the
264 * terminated nul byte), or a negative error code.
266 int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial );
269 * \brief Check a given mbedtls_x509_time against the system time
270 * and tell if it's in the past.
272 * \note Intended usage is "if( is_past( valid_to ) ) ERROR".
273 * Hence the return value of 1 if on internal errors.
275 * \param to mbedtls_x509_time to check
277 * \return 1 if the given time is in the past or an error occurred,
280 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to );
283 * \brief Check a given mbedtls_x509_time against the system time
284 * and tell if it's in the future.
286 * \note Intended usage is "if( is_future( valid_from ) ) ERROR".
287 * Hence the return value of 1 if on internal errors.
289 * \param from mbedtls_x509_time to check
291 * \return 1 if the given time is in the future or an error occurred,
294 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from );
296 #if defined(MBEDTLS_SELF_TEST)
299 * \brief Checkup routine
301 * \return 0 if successful, or 1 if the test failed
303 int mbedtls_x509_self_test( int verbose );
305 #endif /* MBEDTLS_SELF_TEST */
308 * Internal module functions. You probably do not want to use these unless you
311 int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
312 mbedtls_x509_name *cur );
313 int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end,
314 mbedtls_x509_buf *alg );
315 int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
316 mbedtls_x509_buf *alg, mbedtls_x509_buf *params );
317 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
318 int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params,
319 mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
322 int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig );
323 int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
324 mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
326 int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
327 mbedtls_x509_time *t );
328 int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
329 mbedtls_x509_buf *serial );
330 int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
331 mbedtls_x509_buf *ext, int tag );
332 int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
333 mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
334 const void *sig_opts );
335 int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name );
336 int mbedtls_x509_string_to_names( mbedtls_asn1_named_data **head, const char *name );
337 int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
338 int critical, const unsigned char *val,
340 int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start,
341 mbedtls_asn1_named_data *first );
342 int mbedtls_x509_write_names( unsigned char **p, unsigned char *start,
343 mbedtls_asn1_named_data *first );
344 int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start,
345 const char *oid, size_t oid_len,
346 unsigned char *sig, size_t size );
348 #define MBEDTLS_X509_SAFE_SNPRINTF \
350 if( ret < 0 || (size_t) ret >= n ) \
351 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); \