4 * \brief X.509 generic defines and structures
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7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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8 * SPDX-License-Identifier: Apache-2.0
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10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
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11 * not use this file except in compliance with the License.
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12 * You may obtain a copy of the License at
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14 * http://www.apache.org/licenses/LICENSE-2.0
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16 * Unless required by applicable law or agreed to in writing, software
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17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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19 * See the License for the specific language governing permissions and
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20 * limitations under the License.
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22 * This file is part of mbed TLS (https://tls.mbed.org)
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24 #ifndef MBEDTLS_X509_H
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25 #define MBEDTLS_X509_H
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27 #if !defined(MBEDTLS_CONFIG_FILE)
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30 #include MBEDTLS_CONFIG_FILE
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36 #if defined(MBEDTLS_RSA_C)
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41 * \addtogroup x509_module
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45 #if !defined(MBEDTLS_X509_MAX_INTERMEDIATE_CA)
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47 * Maximum number of intermediate CAs in a verification chain.
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48 * That is, maximum length of the chain, excluding the end-entity certificate
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49 * and the trusted root certificate.
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51 * Set this to a low value to prevent an adversary from making you waste
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52 * resources verifying an overlong certificate chain.
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54 #define MBEDTLS_X509_MAX_INTERMEDIATE_CA 8
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58 * \name X509 Error codes
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61 #define MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE -0x2080 /**< Unavailable feature, e.g. RSA hashing/encryption combination. */
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62 #define MBEDTLS_ERR_X509_UNKNOWN_OID -0x2100 /**< Requested OID is unknown. */
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63 #define MBEDTLS_ERR_X509_INVALID_FORMAT -0x2180 /**< The CRT/CRL/CSR format is invalid, e.g. different type expected. */
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64 #define MBEDTLS_ERR_X509_INVALID_VERSION -0x2200 /**< The CRT/CRL/CSR version element is invalid. */
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65 #define MBEDTLS_ERR_X509_INVALID_SERIAL -0x2280 /**< The serial tag or value is invalid. */
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66 #define MBEDTLS_ERR_X509_INVALID_ALG -0x2300 /**< The algorithm tag or value is invalid. */
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67 #define MBEDTLS_ERR_X509_INVALID_NAME -0x2380 /**< The name tag or value is invalid. */
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68 #define MBEDTLS_ERR_X509_INVALID_DATE -0x2400 /**< The date tag or value is invalid. */
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69 #define MBEDTLS_ERR_X509_INVALID_SIGNATURE -0x2480 /**< The signature tag or value invalid. */
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70 #define MBEDTLS_ERR_X509_INVALID_EXTENSIONS -0x2500 /**< The extension tag or value is invalid. */
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71 #define MBEDTLS_ERR_X509_UNKNOWN_VERSION -0x2580 /**< CRT/CRL/CSR has an unsupported version number. */
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72 #define MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG -0x2600 /**< Signature algorithm (oid) is unsupported. */
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73 #define MBEDTLS_ERR_X509_SIG_MISMATCH -0x2680 /**< Signature algorithms do not match. (see \c ::mbedtls_x509_crt sig_oid) */
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74 #define MBEDTLS_ERR_X509_CERT_VERIFY_FAILED -0x2700 /**< Certificate verification failed, e.g. CRL, CA or signature check failed. */
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75 #define MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT -0x2780 /**< Format not recognized as DER or PEM. */
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76 #define MBEDTLS_ERR_X509_BAD_INPUT_DATA -0x2800 /**< Input invalid. */
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77 #define MBEDTLS_ERR_X509_ALLOC_FAILED -0x2880 /**< Allocation of memory failed. */
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78 #define MBEDTLS_ERR_X509_FILE_IO_ERROR -0x2900 /**< Read/write of file failed. */
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79 #define MBEDTLS_ERR_X509_BUFFER_TOO_SMALL -0x2980 /**< Destination buffer is too small. */
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80 #define MBEDTLS_ERR_X509_FATAL_ERROR -0x3000 /**< A fatal error occurred, eg the chain is too long or the vrfy callback failed. */
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84 * \name X509 Verify codes
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87 /* Reminder: update x509_crt_verify_strings[] in library/x509_crt.c */
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88 #define MBEDTLS_X509_BADCERT_EXPIRED 0x01 /**< The certificate validity has expired. */
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89 #define MBEDTLS_X509_BADCERT_REVOKED 0x02 /**< The certificate has been revoked (is on a CRL). */
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90 #define MBEDTLS_X509_BADCERT_CN_MISMATCH 0x04 /**< The certificate Common Name (CN) does not match with the expected CN. */
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91 #define MBEDTLS_X509_BADCERT_NOT_TRUSTED 0x08 /**< The certificate is not correctly signed by the trusted CA. */
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92 #define MBEDTLS_X509_BADCRL_NOT_TRUSTED 0x10 /**< The CRL is not correctly signed by the trusted CA. */
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93 #define MBEDTLS_X509_BADCRL_EXPIRED 0x20 /**< The CRL is expired. */
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94 #define MBEDTLS_X509_BADCERT_MISSING 0x40 /**< Certificate was missing. */
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95 #define MBEDTLS_X509_BADCERT_SKIP_VERIFY 0x80 /**< Certificate verification was skipped. */
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96 #define MBEDTLS_X509_BADCERT_OTHER 0x0100 /**< Other reason (can be used by verify callback) */
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97 #define MBEDTLS_X509_BADCERT_FUTURE 0x0200 /**< The certificate validity starts in the future. */
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98 #define MBEDTLS_X509_BADCRL_FUTURE 0x0400 /**< The CRL is from the future */
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99 #define MBEDTLS_X509_BADCERT_KEY_USAGE 0x0800 /**< Usage does not match the keyUsage extension. */
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100 #define MBEDTLS_X509_BADCERT_EXT_KEY_USAGE 0x1000 /**< Usage does not match the extendedKeyUsage extension. */
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101 #define MBEDTLS_X509_BADCERT_NS_CERT_TYPE 0x2000 /**< Usage does not match the nsCertType extension. */
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102 #define MBEDTLS_X509_BADCERT_BAD_MD 0x4000 /**< The certificate is signed with an unacceptable hash. */
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103 #define MBEDTLS_X509_BADCERT_BAD_PK 0x8000 /**< The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
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104 #define MBEDTLS_X509_BADCERT_BAD_KEY 0x010000 /**< The certificate is signed with an unacceptable key (eg bad curve, RSA too short). */
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105 #define MBEDTLS_X509_BADCRL_BAD_MD 0x020000 /**< The CRL is signed with an unacceptable hash. */
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106 #define MBEDTLS_X509_BADCRL_BAD_PK 0x040000 /**< The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
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107 #define MBEDTLS_X509_BADCRL_BAD_KEY 0x080000 /**< The CRL is signed with an unacceptable key (eg bad curve, RSA too short). */
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110 /* \} addtogroup x509_module */
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113 * X.509 v3 Subject Alternative Name types.
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114 * otherName [0] OtherName,
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115 * rfc822Name [1] IA5String,
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116 * dNSName [2] IA5String,
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117 * x400Address [3] ORAddress,
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118 * directoryName [4] Name,
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119 * ediPartyName [5] EDIPartyName,
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120 * uniformResourceIdentifier [6] IA5String,
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121 * iPAddress [7] OCTET STRING,
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122 * registeredID [8] OBJECT IDENTIFIER
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124 #define MBEDTLS_X509_SAN_OTHER_NAME 0
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125 #define MBEDTLS_X509_SAN_RFC822_NAME 1
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126 #define MBEDTLS_X509_SAN_DNS_NAME 2
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127 #define MBEDTLS_X509_SAN_X400_ADDRESS_NAME 3
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128 #define MBEDTLS_X509_SAN_DIRECTORY_NAME 4
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129 #define MBEDTLS_X509_SAN_EDI_PARTY_NAME 5
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130 #define MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER 6
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131 #define MBEDTLS_X509_SAN_IP_ADDRESS 7
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132 #define MBEDTLS_X509_SAN_REGISTERED_ID 8
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135 * X.509 v3 Key Usage Extension flags
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136 * Reminder: update x509_info_key_usage() when adding new flags.
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138 #define MBEDTLS_X509_KU_DIGITAL_SIGNATURE (0x80) /* bit 0 */
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139 #define MBEDTLS_X509_KU_NON_REPUDIATION (0x40) /* bit 1 */
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140 #define MBEDTLS_X509_KU_KEY_ENCIPHERMENT (0x20) /* bit 2 */
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141 #define MBEDTLS_X509_KU_DATA_ENCIPHERMENT (0x10) /* bit 3 */
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142 #define MBEDTLS_X509_KU_KEY_AGREEMENT (0x08) /* bit 4 */
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143 #define MBEDTLS_X509_KU_KEY_CERT_SIGN (0x04) /* bit 5 */
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144 #define MBEDTLS_X509_KU_CRL_SIGN (0x02) /* bit 6 */
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145 #define MBEDTLS_X509_KU_ENCIPHER_ONLY (0x01) /* bit 7 */
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146 #define MBEDTLS_X509_KU_DECIPHER_ONLY (0x8000) /* bit 8 */
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149 * Netscape certificate types
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150 * (http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html)
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153 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT (0x80) /* bit 0 */
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154 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER (0x40) /* bit 1 */
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155 #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL (0x20) /* bit 2 */
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156 #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING (0x10) /* bit 3 */
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157 #define MBEDTLS_X509_NS_CERT_TYPE_RESERVED (0x08) /* bit 4 */
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158 #define MBEDTLS_X509_NS_CERT_TYPE_SSL_CA (0x04) /* bit 5 */
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159 #define MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA (0x02) /* bit 6 */
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160 #define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA (0x01) /* bit 7 */
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163 * X.509 extension types
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165 * Comments refer to the status for using certificates. Status can be
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166 * different for writing certificates or reading CRLs or CSRs.
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168 * Those are defined in oid.h as oid.c needs them in a data structure. Since
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169 * these were previously defined here, let's have aliases for compatibility.
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171 #define MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER MBEDTLS_OID_X509_EXT_AUTHORITY_KEY_IDENTIFIER
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172 #define MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER MBEDTLS_OID_X509_EXT_SUBJECT_KEY_IDENTIFIER
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173 #define MBEDTLS_X509_EXT_KEY_USAGE MBEDTLS_OID_X509_EXT_KEY_USAGE
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174 #define MBEDTLS_X509_EXT_CERTIFICATE_POLICIES MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES
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175 #define MBEDTLS_X509_EXT_POLICY_MAPPINGS MBEDTLS_OID_X509_EXT_POLICY_MAPPINGS
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176 #define MBEDTLS_X509_EXT_SUBJECT_ALT_NAME MBEDTLS_OID_X509_EXT_SUBJECT_ALT_NAME /* Supported (DNS) */
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177 #define MBEDTLS_X509_EXT_ISSUER_ALT_NAME MBEDTLS_OID_X509_EXT_ISSUER_ALT_NAME
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178 #define MBEDTLS_X509_EXT_SUBJECT_DIRECTORY_ATTRS MBEDTLS_OID_X509_EXT_SUBJECT_DIRECTORY_ATTRS
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179 #define MBEDTLS_X509_EXT_BASIC_CONSTRAINTS MBEDTLS_OID_X509_EXT_BASIC_CONSTRAINTS /* Supported */
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180 #define MBEDTLS_X509_EXT_NAME_CONSTRAINTS MBEDTLS_OID_X509_EXT_NAME_CONSTRAINTS
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181 #define MBEDTLS_X509_EXT_POLICY_CONSTRAINTS MBEDTLS_OID_X509_EXT_POLICY_CONSTRAINTS
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182 #define MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE MBEDTLS_OID_X509_EXT_EXTENDED_KEY_USAGE
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183 #define MBEDTLS_X509_EXT_CRL_DISTRIBUTION_POINTS MBEDTLS_OID_X509_EXT_CRL_DISTRIBUTION_POINTS
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184 #define MBEDTLS_X509_EXT_INIHIBIT_ANYPOLICY MBEDTLS_OID_X509_EXT_INIHIBIT_ANYPOLICY
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185 #define MBEDTLS_X509_EXT_FRESHEST_CRL MBEDTLS_OID_X509_EXT_FRESHEST_CRL
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186 #define MBEDTLS_X509_EXT_NS_CERT_TYPE MBEDTLS_OID_X509_EXT_NS_CERT_TYPE
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189 * Storage format identifiers
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190 * Recognized formats: PEM and DER
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192 #define MBEDTLS_X509_FORMAT_DER 1
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193 #define MBEDTLS_X509_FORMAT_PEM 2
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195 #define MBEDTLS_X509_MAX_DN_NAME_SIZE 256 /**< Maximum value size of a DN entry */
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202 * \addtogroup x509_module
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206 * \name Structures for parsing X.509 certificates, CRLs and CSRs
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211 * Type-length-value structure that allows for ASN1 using DER.
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213 typedef mbedtls_asn1_buf mbedtls_x509_buf;
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216 * Container for ASN1 bit strings.
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218 typedef mbedtls_asn1_bitstring mbedtls_x509_bitstring;
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221 * Container for ASN1 named information objects.
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222 * It allows for Relative Distinguished Names (e.g. cn=localhost,ou=code,etc.).
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224 typedef mbedtls_asn1_named_data mbedtls_x509_name;
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227 * Container for a sequence of ASN.1 items
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229 typedef mbedtls_asn1_sequence mbedtls_x509_sequence;
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231 /** Container for date and time (precision in seconds). */
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232 typedef struct mbedtls_x509_time
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234 int year, mon, day; /**< Date. */
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235 int hour, min, sec; /**< Time. */
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239 /** \} name Structures for parsing X.509 certificates, CRLs and CSRs */
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240 /** \} addtogroup x509_module */
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243 * \brief Store the certificate DN in printable form into buf;
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244 * no more than size characters will be written.
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246 * \param buf Buffer to write to
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247 * \param size Maximum size of buffer
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248 * \param dn The X509 name to represent
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250 * \return The length of the string written (not including the
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251 * terminated nul byte), or a negative error code.
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253 int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn );
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256 * \brief Store the certificate serial in printable form into buf;
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257 * no more than size characters will be written.
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259 * \param buf Buffer to write to
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260 * \param size Maximum size of buffer
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261 * \param serial The X509 serial to represent
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263 * \return The length of the string written (not including the
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264 * terminated nul byte), or a negative error code.
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266 int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial );
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269 * \brief Check a given mbedtls_x509_time against the system time
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270 * and tell if it's in the past.
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272 * \note Intended usage is "if( is_past( valid_to ) ) ERROR".
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273 * Hence the return value of 1 if on internal errors.
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275 * \param to mbedtls_x509_time to check
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277 * \return 1 if the given time is in the past or an error occurred,
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280 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to );
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283 * \brief Check a given mbedtls_x509_time against the system time
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284 * and tell if it's in the future.
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286 * \note Intended usage is "if( is_future( valid_from ) ) ERROR".
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287 * Hence the return value of 1 if on internal errors.
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289 * \param from mbedtls_x509_time to check
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291 * \return 1 if the given time is in the future or an error occurred,
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294 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from );
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296 #if defined(MBEDTLS_SELF_TEST)
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299 * \brief Checkup routine
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301 * \return 0 if successful, or 1 if the test failed
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303 int mbedtls_x509_self_test( int verbose );
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305 #endif /* MBEDTLS_SELF_TEST */
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308 * Internal module functions. You probably do not want to use these unless you
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311 int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
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312 mbedtls_x509_name *cur );
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313 int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end,
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314 mbedtls_x509_buf *alg );
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315 int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
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316 mbedtls_x509_buf *alg, mbedtls_x509_buf *params );
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317 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
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318 int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params,
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319 mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
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322 int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig );
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323 int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
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324 mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
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326 int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
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327 mbedtls_x509_time *t );
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328 int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
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329 mbedtls_x509_buf *serial );
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330 int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
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331 mbedtls_x509_buf *ext, int tag );
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332 int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
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333 mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
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334 const void *sig_opts );
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335 int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name );
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336 int mbedtls_x509_string_to_names( mbedtls_asn1_named_data **head, const char *name );
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337 int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
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338 int critical, const unsigned char *val,
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340 int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start,
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341 mbedtls_asn1_named_data *first );
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342 int mbedtls_x509_write_names( unsigned char **p, unsigned char *start,
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343 mbedtls_asn1_named_data *first );
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344 int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start,
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345 const char *oid, size_t oid_len,
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346 unsigned char *sig, size_t size );
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348 #define MBEDTLS_X509_SAFE_SNPRINTF \
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350 if( ret < 0 || (size_t) ret >= n ) \
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351 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); \
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353 n -= (size_t) ret; \
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354 p += (size_t) ret; \
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361 #endif /* x509.h */
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