1 /** 2 * \file x509.h 3 * 4 * \brief X.509 generic defines and structures 5 */ 6 /* 7 * Copyright The Mbed TLS Contributors 8 * SPDX-License-Identifier: Apache-2.0 9 * 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 13 * 14 * http://www.apache.org/licenses/LICENSE-2.0 15 * 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. 21 */ 22 #ifndef MBEDTLS_X509_H 23 #define MBEDTLS_X509_H 24 25 #if !defined(MBEDTLS_CONFIG_FILE) 26 #include "mbedtls/config.h" 27 #else 28 #include MBEDTLS_CONFIG_FILE 29 #endif 30 31 #include "mbedtls/asn1.h" 32 #include "mbedtls/pk.h" 33 34 #if defined(MBEDTLS_RSA_C) 35 #include "mbedtls/rsa.h" 36 #endif 37 38 /** 39 * \addtogroup x509_module 40 * \{ 41 */ 42 43 #if !defined(MBEDTLS_X509_MAX_INTERMEDIATE_CA) 44 /** 45 * Maximum number of intermediate CAs in a verification chain. 46 * That is, maximum length of the chain, excluding the end-entity certificate 47 * and the trusted root certificate. 48 * 49 * Set this to a low value to prevent an adversary from making you waste 50 * resources verifying an overlong certificate chain. 51 */ 52 #define MBEDTLS_X509_MAX_INTERMEDIATE_CA 8 53 #endif 54 55 /** 56 * \name X509 Error codes 57 * \{ 58 */ 59 #define MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE -0x2080 /**< Unavailable feature, e.g. RSA hashing/encryption combination. */ 60 #define MBEDTLS_ERR_X509_UNKNOWN_OID -0x2100 /**< Requested OID is unknown. */ 61 #define MBEDTLS_ERR_X509_INVALID_FORMAT -0x2180 /**< The CRT/CRL/CSR format is invalid, e.g. different type expected. */ 62 #define MBEDTLS_ERR_X509_INVALID_VERSION -0x2200 /**< The CRT/CRL/CSR version element is invalid. */ 63 #define MBEDTLS_ERR_X509_INVALID_SERIAL -0x2280 /**< The serial tag or value is invalid. */ 64 #define MBEDTLS_ERR_X509_INVALID_ALG -0x2300 /**< The algorithm tag or value is invalid. */ 65 #define MBEDTLS_ERR_X509_INVALID_NAME -0x2380 /**< The name tag or value is invalid. */ 66 #define MBEDTLS_ERR_X509_INVALID_DATE -0x2400 /**< The date tag or value is invalid. */ 67 #define MBEDTLS_ERR_X509_INVALID_SIGNATURE -0x2480 /**< The signature tag or value invalid. */ 68 #define MBEDTLS_ERR_X509_INVALID_EXTENSIONS -0x2500 /**< The extension tag or value is invalid. */ 69 #define MBEDTLS_ERR_X509_UNKNOWN_VERSION -0x2580 /**< CRT/CRL/CSR has an unsupported version number. */ 70 #define MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG -0x2600 /**< Signature algorithm (oid) is unsupported. */ 71 #define MBEDTLS_ERR_X509_SIG_MISMATCH -0x2680 /**< Signature algorithms do not match. (see \c ::mbedtls_x509_crt sig_oid) */ 72 #define MBEDTLS_ERR_X509_CERT_VERIFY_FAILED -0x2700 /**< Certificate verification failed, e.g. CRL, CA or signature check failed. */ 73 #define MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT -0x2780 /**< Format not recognized as DER or PEM. */ 74 #define MBEDTLS_ERR_X509_BAD_INPUT_DATA -0x2800 /**< Input invalid. */ 75 #define MBEDTLS_ERR_X509_ALLOC_FAILED -0x2880 /**< Allocation of memory failed. */ 76 #define MBEDTLS_ERR_X509_FILE_IO_ERROR -0x2900 /**< Read/write of file failed. */ 77 #define MBEDTLS_ERR_X509_BUFFER_TOO_SMALL -0x2980 /**< Destination buffer is too small. */ 78 #define MBEDTLS_ERR_X509_FATAL_ERROR -0x3000 /**< A fatal error occurred, eg the chain is too long or the vrfy callback failed. */ 79 /* \} name */ 80 81 /** 82 * \name X509 Verify codes 83 * \{ 84 */ 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). */ 106 107 /* \} name */ 108 /* \} addtogroup x509_module */ 109 110 /* 111 * X.509 v3 Subject Alternative Name types. 112 * otherName [0] OtherName, 113 * rfc822Name [1] IA5String, 114 * dNSName [2] IA5String, 115 * x400Address [3] ORAddress, 116 * directoryName [4] Name, 117 * ediPartyName [5] EDIPartyName, 118 * uniformResourceIdentifier [6] IA5String, 119 * iPAddress [7] OCTET STRING, 120 * registeredID [8] OBJECT IDENTIFIER 121 */ 122 #define MBEDTLS_X509_SAN_OTHER_NAME 0 123 #define MBEDTLS_X509_SAN_RFC822_NAME 1 124 #define MBEDTLS_X509_SAN_DNS_NAME 2 125 #define MBEDTLS_X509_SAN_X400_ADDRESS_NAME 3 126 #define MBEDTLS_X509_SAN_DIRECTORY_NAME 4 127 #define MBEDTLS_X509_SAN_EDI_PARTY_NAME 5 128 #define MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER 6 129 #define MBEDTLS_X509_SAN_IP_ADDRESS 7 130 #define MBEDTLS_X509_SAN_REGISTERED_ID 8 131 132 /* 133 * X.509 v3 Key Usage Extension flags 134 * Reminder: update x509_info_key_usage() when adding new flags. 135 */ 136 #define MBEDTLS_X509_KU_DIGITAL_SIGNATURE (0x80) /* bit 0 */ 137 #define MBEDTLS_X509_KU_NON_REPUDIATION (0x40) /* bit 1 */ 138 #define MBEDTLS_X509_KU_KEY_ENCIPHERMENT (0x20) /* bit 2 */ 139 #define MBEDTLS_X509_KU_DATA_ENCIPHERMENT (0x10) /* bit 3 */ 140 #define MBEDTLS_X509_KU_KEY_AGREEMENT (0x08) /* bit 4 */ 141 #define MBEDTLS_X509_KU_KEY_CERT_SIGN (0x04) /* bit 5 */ 142 #define MBEDTLS_X509_KU_CRL_SIGN (0x02) /* bit 6 */ 143 #define MBEDTLS_X509_KU_ENCIPHER_ONLY (0x01) /* bit 7 */ 144 #define MBEDTLS_X509_KU_DECIPHER_ONLY (0x8000) /* bit 8 */ 145 146 /* 147 * Netscape certificate types 148 * (http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html) 149 */ 150 151 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT (0x80) /* bit 0 */ 152 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER (0x40) /* bit 1 */ 153 #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL (0x20) /* bit 2 */ 154 #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING (0x10) /* bit 3 */ 155 #define MBEDTLS_X509_NS_CERT_TYPE_RESERVED (0x08) /* bit 4 */ 156 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CA (0x04) /* bit 5 */ 157 #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA (0x02) /* bit 6 */ 158 #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA (0x01) /* bit 7 */ 159 160 /* 161 * X.509 extension types 162 * 163 * Comments refer to the status for using certificates. Status can be 164 * different for writing certificates or reading CRLs or CSRs. 165 * 166 * Those are defined in oid.h as oid.c needs them in a data structure. Since 167 * these were previously defined here, let's have aliases for compatibility. 168 */ 169 #define MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER MBEDTLS_OID_X509_EXT_AUTHORITY_KEY_IDENTIFIER 170 #define MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER MBEDTLS_OID_X509_EXT_SUBJECT_KEY_IDENTIFIER 171 #define MBEDTLS_X509_EXT_KEY_USAGE MBEDTLS_OID_X509_EXT_KEY_USAGE 172 #define MBEDTLS_X509_EXT_CERTIFICATE_POLICIES MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES 173 #define MBEDTLS_X509_EXT_POLICY_MAPPINGS MBEDTLS_OID_X509_EXT_POLICY_MAPPINGS 174 #define MBEDTLS_X509_EXT_SUBJECT_ALT_NAME MBEDTLS_OID_X509_EXT_SUBJECT_ALT_NAME /* Supported (DNS) */ 175 #define MBEDTLS_X509_EXT_ISSUER_ALT_NAME MBEDTLS_OID_X509_EXT_ISSUER_ALT_NAME 176 #define MBEDTLS_X509_EXT_SUBJECT_DIRECTORY_ATTRS MBEDTLS_OID_X509_EXT_SUBJECT_DIRECTORY_ATTRS 177 #define MBEDTLS_X509_EXT_BASIC_CONSTRAINTS MBEDTLS_OID_X509_EXT_BASIC_CONSTRAINTS /* Supported */ 178 #define MBEDTLS_X509_EXT_NAME_CONSTRAINTS MBEDTLS_OID_X509_EXT_NAME_CONSTRAINTS 179 #define MBEDTLS_X509_EXT_POLICY_CONSTRAINTS MBEDTLS_OID_X509_EXT_POLICY_CONSTRAINTS 180 #define MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE MBEDTLS_OID_X509_EXT_EXTENDED_KEY_USAGE 181 #define MBEDTLS_X509_EXT_CRL_DISTRIBUTION_POINTS MBEDTLS_OID_X509_EXT_CRL_DISTRIBUTION_POINTS 182 #define MBEDTLS_X509_EXT_INIHIBIT_ANYPOLICY MBEDTLS_OID_X509_EXT_INIHIBIT_ANYPOLICY 183 #define MBEDTLS_X509_EXT_FRESHEST_CRL MBEDTLS_OID_X509_EXT_FRESHEST_CRL 184 #define MBEDTLS_X509_EXT_NS_CERT_TYPE MBEDTLS_OID_X509_EXT_NS_CERT_TYPE 185 186 /* 187 * Storage format identifiers 188 * Recognized formats: PEM and DER 189 */ 190 #define MBEDTLS_X509_FORMAT_DER 1 191 #define MBEDTLS_X509_FORMAT_PEM 2 192 193 #define MBEDTLS_X509_MAX_DN_NAME_SIZE 256 /**< Maximum value size of a DN entry */ 194 195 #ifdef __cplusplus 196 extern "C" { 197 #endif 198 199 /** 200 * \addtogroup x509_module 201 * \{ */ 202 203 /** 204 * \name Structures for parsing X.509 certificates, CRLs and CSRs 205 * \{ 206 */ 207 208 /** 209 * Type-length-value structure that allows for ASN1 using DER. 210 */ 211 typedef mbedtls_asn1_buf mbedtls_x509_buf; 212 213 /** 214 * Container for ASN1 bit strings. 215 */ 216 typedef mbedtls_asn1_bitstring mbedtls_x509_bitstring; 217 218 /** 219 * Container for ASN1 named information objects. 220 * It allows for Relative Distinguished Names (e.g. cn=localhost,ou=code,etc.). 221 */ 222 typedef mbedtls_asn1_named_data mbedtls_x509_name; 223 224 /** 225 * Container for a sequence of ASN.1 items 226 */ 227 typedef mbedtls_asn1_sequence mbedtls_x509_sequence; 228 229 /** Container for date and time (precision in seconds). */ 230 typedef struct mbedtls_x509_time 231 { 232 int year, mon, day; /**< Date. */ 233 int hour, min, sec; /**< Time. */ 234 } 235 mbedtls_x509_time; 236 237 /** \} name Structures for parsing X.509 certificates, CRLs and CSRs */ 238 /** \} addtogroup x509_module */ 239 240 /** 241 * \brief Store the certificate DN in printable form into buf; 242 * no more than size characters will be written. 243 * 244 * \param buf Buffer to write to 245 * \param size Maximum size of buffer 246 * \param dn The X509 name to represent 247 * 248 * \return The length of the string written (not including the 249 * terminated nul byte), or a negative error code. 250 */ 251 int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn ); 252 253 /** 254 * \brief Store the certificate serial in printable form into buf; 255 * no more than size characters will be written. 256 * 257 * \param buf Buffer to write to 258 * \param size Maximum size of buffer 259 * \param serial The X509 serial to represent 260 * 261 * \return The length of the string written (not including the 262 * terminated nul byte), or a negative error code. 263 */ 264 int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial ); 265 266 /** 267 * \brief Check a given mbedtls_x509_time against the system time 268 * and tell if it's in the past. 269 * 270 * \note Intended usage is "if( is_past( valid_to ) ) ERROR". 271 * Hence the return value of 1 if on internal errors. 272 * 273 * \param to mbedtls_x509_time to check 274 * 275 * \return 1 if the given time is in the past or an error occurred, 276 * 0 otherwise. 277 */ 278 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to ); 279 280 /** 281 * \brief Check a given mbedtls_x509_time against the system time 282 * and tell if it's in the future. 283 * 284 * \note Intended usage is "if( is_future( valid_from ) ) ERROR". 285 * Hence the return value of 1 if on internal errors. 286 * 287 * \param from mbedtls_x509_time to check 288 * 289 * \return 1 if the given time is in the future or an error occurred, 290 * 0 otherwise. 291 */ 292 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from ); 293 294 #if defined(MBEDTLS_SELF_TEST) 295 296 /** 297 * \brief Checkup routine 298 * 299 * \return 0 if successful, or 1 if the test failed 300 */ 301 int mbedtls_x509_self_test( int verbose ); 302 303 #endif /* MBEDTLS_SELF_TEST */ 304 305 /* 306 * Internal module functions. You probably do not want to use these unless you 307 * know you do. 308 */ 309 int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end, 310 mbedtls_x509_name *cur ); 311 int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end, 312 mbedtls_x509_buf *alg ); 313 int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end, 314 mbedtls_x509_buf *alg, mbedtls_x509_buf *params ); 315 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) 316 int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params, 317 mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md, 318 int *salt_len ); 319 #endif 320 int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig ); 321 int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params, 322 mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg, 323 void **sig_opts ); 324 int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end, 325 mbedtls_x509_time *t ); 326 int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end, 327 mbedtls_x509_buf *serial ); 328 int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end, 329 mbedtls_x509_buf *ext, int tag ); 330 int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid, 331 mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg, 332 const void *sig_opts ); 333 int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name ); 334 int mbedtls_x509_string_to_names( mbedtls_asn1_named_data **head, const char *name ); 335 int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len, 336 int critical, const unsigned char *val, 337 size_t val_len ); 338 int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start, 339 mbedtls_asn1_named_data *first ); 340 int mbedtls_x509_write_names( unsigned char **p, unsigned char *start, 341 mbedtls_asn1_named_data *first ); 342 int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start, 343 const char *oid, size_t oid_len, 344 unsigned char *sig, size_t size ); 345 346 #define MBEDTLS_X509_SAFE_SNPRINTF \ 347 do { \ 348 if( ret < 0 || (size_t) ret >= n ) \ 349 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); \ 350 \ 351 n -= (size_t) ret; \ 352 p += (size_t) ret; \ 353 } while( 0 ) 354 355 #ifdef __cplusplus 356 } 357 #endif 358 359 #endif /* x509.h */ 360