1 /*
2  * X.509v3 certificate parsing and processing
3  * Copyright (c) 2006-2011, Jouni Malinen <j@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 struct x509_certificate {
49 	struct x509_certificate *next;
50 	enum { X509_CERT_V1 = 0, X509_CERT_V2 = 1, X509_CERT_V3 = 2 } version;
51 	unsigned long serial_number;
52 	struct x509_algorithm_identifier signature;
53 	struct x509_name issuer;
54 	struct x509_name subject;
55 	os_time_t not_before;
56 	os_time_t not_after;
57 	struct x509_algorithm_identifier public_key_alg;
58 	u8 *public_key;
59 	size_t public_key_len;
60 	struct x509_algorithm_identifier signature_alg;
61 	u8 *sign_value;
62 	size_t sign_value_len;
63 
64 	/* Extensions */
65 	unsigned int extensions_present;
66 #define X509_EXT_BASIC_CONSTRAINTS		(1 << 0)
67 #define X509_EXT_PATH_LEN_CONSTRAINT		(1 << 1)
68 #define X509_EXT_KEY_USAGE			(1 << 2)
69 #define X509_EXT_SUBJECT_ALT_NAME		(1 << 3)
70 #define X509_EXT_ISSUER_ALT_NAME		(1 << 4)
71 
72 	/* BasicConstraints */
73 	int ca; /* cA */
74 	unsigned long path_len_constraint; /* pathLenConstraint */
75 
76 	/* KeyUsage */
77 	unsigned long key_usage;
78 #define X509_KEY_USAGE_DIGITAL_SIGNATURE	(1 << 0)
79 #define X509_KEY_USAGE_NON_REPUDIATION		(1 << 1)
80 #define X509_KEY_USAGE_KEY_ENCIPHERMENT		(1 << 2)
81 #define X509_KEY_USAGE_DATA_ENCIPHERMENT	(1 << 3)
82 #define X509_KEY_USAGE_KEY_AGREEMENT		(1 << 4)
83 #define X509_KEY_USAGE_KEY_CERT_SIGN		(1 << 5)
84 #define X509_KEY_USAGE_CRL_SIGN			(1 << 6)
85 #define X509_KEY_USAGE_ENCIPHER_ONLY		(1 << 7)
86 #define X509_KEY_USAGE_DECIPHER_ONLY		(1 << 8)
87 
88 	/*
89 	 * The DER format certificate follows struct x509_certificate. These
90 	 * pointers point to that buffer.
91 	 */
92 	const u8 *cert_start;
93 	size_t cert_len;
94 	const u8 *tbs_cert_start;
95 	size_t tbs_cert_len;
96 };
97 
98 enum {
99 	X509_VALIDATE_OK,
100 	X509_VALIDATE_BAD_CERTIFICATE,
101 	X509_VALIDATE_UNSUPPORTED_CERTIFICATE,
102 	X509_VALIDATE_CERTIFICATE_REVOKED,
103 	X509_VALIDATE_CERTIFICATE_EXPIRED,
104 	X509_VALIDATE_CERTIFICATE_UNKNOWN,
105 	X509_VALIDATE_UNKNOWN_CA
106 };
107 
108 void x509_certificate_free(struct x509_certificate *cert);
109 struct x509_certificate * x509_certificate_parse(const u8 *buf, size_t len);
110 void x509_name_string(struct x509_name *name, char *buf, size_t len);
111 int x509_name_compare(struct x509_name *a, struct x509_name *b);
112 void x509_certificate_chain_free(struct x509_certificate *cert);
113 int x509_certificate_check_signature(struct x509_certificate *issuer,
114 				     struct x509_certificate *cert);
115 int x509_certificate_chain_validate(struct x509_certificate *trusted,
116 				    struct x509_certificate *chain,
117 				    int *reason, int disable_time_checks);
118 struct x509_certificate *
119 x509_certificate_get_subject(struct x509_certificate *chain,
120 			     struct x509_name *name);
121 int x509_certificate_self_signed(struct x509_certificate *cert);
122 
123 #endif /* X509V3_H */
124