1 /* 2 * X.509v3 certificate parsing and processing 3 * Copyright (c) 2006-2011, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #ifndef X509V3_H 10 #define X509V3_H 11 12 #include "asn1.h" 13 14 struct x509_algorithm_identifier { 15 struct asn1_oid oid; 16 }; 17 18 struct x509_name_attr { 19 enum x509_name_attr_type { 20 X509_NAME_ATTR_NOT_USED, 21 X509_NAME_ATTR_DC, 22 X509_NAME_ATTR_CN, 23 X509_NAME_ATTR_C, 24 X509_NAME_ATTR_L, 25 X509_NAME_ATTR_ST, 26 X509_NAME_ATTR_O, 27 X509_NAME_ATTR_OU 28 } type; 29 char *value; 30 }; 31 32 #define X509_MAX_NAME_ATTRIBUTES 20 33 34 struct x509_name { 35 struct x509_name_attr attr[X509_MAX_NAME_ATTRIBUTES]; 36 size_t num_attr; 37 char *email; /* emailAddress */ 38 39 /* from alternative name extension */ 40 char *alt_email; /* rfc822Name */ 41 char *dns; /* dNSName */ 42 char *uri; /* uniformResourceIdentifier */ 43 u8 *ip; /* iPAddress */ 44 size_t ip_len; /* IPv4: 4, IPv6: 16 */ 45 struct asn1_oid rid; /* registeredID */ 46 }; 47 48 #define X509_MAX_SERIAL_NUM_LEN 20 49 50 struct x509_certificate { 51 struct x509_certificate *next; 52 enum { X509_CERT_V1 = 0, X509_CERT_V2 = 1, X509_CERT_V3 = 2 } version; 53 u8 serial_number[X509_MAX_SERIAL_NUM_LEN]; 54 size_t serial_number_len; 55 struct x509_algorithm_identifier signature; 56 struct x509_name issuer; 57 struct x509_name subject; 58 u8 *subject_dn; 59 size_t subject_dn_len; 60 os_time_t not_before; 61 os_time_t not_after; 62 struct x509_algorithm_identifier public_key_alg; 63 u8 *public_key; 64 size_t public_key_len; 65 struct x509_algorithm_identifier signature_alg; 66 u8 *sign_value; 67 size_t sign_value_len; 68 69 /* Extensions */ 70 unsigned int extensions_present; 71 #define X509_EXT_BASIC_CONSTRAINTS (1 << 0) 72 #define X509_EXT_PATH_LEN_CONSTRAINT (1 << 1) 73 #define X509_EXT_KEY_USAGE (1 << 2) 74 #define X509_EXT_SUBJECT_ALT_NAME (1 << 3) 75 #define X509_EXT_ISSUER_ALT_NAME (1 << 4) 76 #define X509_EXT_EXT_KEY_USAGE (1 << 5) 77 78 /* BasicConstraints */ 79 int ca; /* cA */ 80 unsigned long path_len_constraint; /* pathLenConstraint */ 81 82 /* KeyUsage */ 83 unsigned long key_usage; 84 #define X509_KEY_USAGE_DIGITAL_SIGNATURE (1 << 0) 85 #define X509_KEY_USAGE_NON_REPUDIATION (1 << 1) 86 #define X509_KEY_USAGE_KEY_ENCIPHERMENT (1 << 2) 87 #define X509_KEY_USAGE_DATA_ENCIPHERMENT (1 << 3) 88 #define X509_KEY_USAGE_KEY_AGREEMENT (1 << 4) 89 #define X509_KEY_USAGE_KEY_CERT_SIGN (1 << 5) 90 #define X509_KEY_USAGE_CRL_SIGN (1 << 6) 91 #define X509_KEY_USAGE_ENCIPHER_ONLY (1 << 7) 92 #define X509_KEY_USAGE_DECIPHER_ONLY (1 << 8) 93 94 /* ExtKeyUsage */ 95 unsigned long ext_key_usage; 96 #define X509_EXT_KEY_USAGE_ANY (1 << 0) 97 #define X509_EXT_KEY_USAGE_SERVER_AUTH (1 << 1) 98 #define X509_EXT_KEY_USAGE_CLIENT_AUTH (1 << 2) 99 #define X509_EXT_KEY_USAGE_OCSP (1 << 3) 100 101 /* 102 * The DER format certificate follows struct x509_certificate. These 103 * pointers point to that buffer. 104 */ 105 const u8 *cert_start; 106 size_t cert_len; 107 const u8 *tbs_cert_start; 108 size_t tbs_cert_len; 109 110 /* Meta data used for certificate validation */ 111 unsigned int ocsp_good:1; 112 unsigned int ocsp_revoked:1; 113 unsigned int issuer_trusted:1; 114 }; 115 116 enum { 117 X509_VALIDATE_OK, 118 X509_VALIDATE_BAD_CERTIFICATE, 119 X509_VALIDATE_UNSUPPORTED_CERTIFICATE, 120 X509_VALIDATE_CERTIFICATE_REVOKED, 121 X509_VALIDATE_CERTIFICATE_EXPIRED, 122 X509_VALIDATE_CERTIFICATE_UNKNOWN, 123 X509_VALIDATE_UNKNOWN_CA 124 }; 125 126 void x509_certificate_free(struct x509_certificate *cert); 127 int x509_parse_algorithm_identifier(const u8 *buf, size_t len, 128 struct x509_algorithm_identifier *id, 129 const u8 **next); 130 int x509_parse_name(const u8 *buf, size_t len, struct x509_name *name, 131 const u8 **next); 132 int x509_parse_time(const u8 *buf, size_t len, u8 asn1_tag, os_time_t *val); 133 struct x509_certificate * x509_certificate_parse(const u8 *buf, size_t len); 134 void x509_free_name(struct x509_name *name); 135 void x509_name_string(struct x509_name *name, char *buf, size_t len); 136 int x509_name_compare(struct x509_name *a, struct x509_name *b); 137 void x509_certificate_chain_free(struct x509_certificate *cert); 138 int x509_check_signature(struct x509_certificate *issuer, 139 struct x509_algorithm_identifier *signature, 140 const u8 *sign_value, size_t sign_value_len, 141 const u8 *signed_data, size_t signed_data_len); 142 int x509_certificate_check_signature(struct x509_certificate *issuer, 143 struct x509_certificate *cert); 144 int x509_certificate_chain_validate(struct x509_certificate *trusted, 145 struct x509_certificate *chain, 146 int *reason, int disable_time_checks); 147 struct x509_certificate * 148 x509_certificate_get_subject(struct x509_certificate *chain, 149 struct x509_name *name); 150 int x509_certificate_self_signed(struct x509_certificate *cert); 151 152 int x509_sha1_oid(struct asn1_oid *oid); 153 int x509_sha256_oid(struct asn1_oid *oid); 154 int x509_sha384_oid(struct asn1_oid *oid); 155 int x509_sha512_oid(struct asn1_oid *oid); 156 157 #endif /* X509V3_H */ 158
