1 /*
2 * EAP server method registration
3 * Copyright (c) 2004-2009, 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 #include "includes.h"
10
11 #include "common.h"
12 #include "eap_i.h"
13 #include "eap_methods.h"
14
15
16 static struct eap_method *eap_methods;
17
18
19 /**
20 * eap_server_get_eap_method - Get EAP method based on type number
21 * @vendor: EAP Vendor-Id (0 = IETF)
22 * @method: EAP type number
23 * Returns: Pointer to EAP method or %NULL if not found
24 */
eap_server_get_eap_method(int vendor,EapType method)25 const struct eap_method * eap_server_get_eap_method(int vendor, EapType method)
26 {
27 struct eap_method *m;
28 for (m = eap_methods; m; m = m->next) {
29 if (m->vendor == vendor && m->method == method)
30 return m;
31 }
32 return NULL;
33 }
34
35
36 /**
37 * eap_server_get_type - Get EAP type for the given EAP method name
38 * @name: EAP method name, e.g., TLS
39 * @vendor: Buffer for returning EAP Vendor-Id
40 * Returns: EAP method type or %EAP_TYPE_NONE if not found
41 *
42 * This function maps EAP type names into EAP type numbers based on the list of
43 * EAP methods included in the build.
44 */
eap_server_get_type(const char * name,int * vendor)45 EapType eap_server_get_type(const char *name, int *vendor)
46 {
47 struct eap_method *m;
48 for (m = eap_methods; m; m = m->next) {
49 if (os_strcmp(m->name, name) == 0) {
50 *vendor = m->vendor;
51 return m->method;
52 }
53 }
54 *vendor = EAP_VENDOR_IETF;
55 return EAP_TYPE_NONE;
56 }
57
58
59 /**
60 * eap_server_method_alloc - Allocate EAP server method structure
61 * @version: Version of the EAP server method interface (set to
62 * EAP_SERVER_METHOD_INTERFACE_VERSION)
63 * @vendor: EAP Vendor-ID (EAP_VENDOR_*) (0 = IETF)
64 * @method: EAP type number (EAP_TYPE_*)
65 * @name: Name of the method (e.g., "TLS")
66 * Returns: Allocated EAP method structure or %NULL on failure
67 *
68 * The returned structure should be freed with eap_server_method_free() when it
69 * is not needed anymore.
70 */
eap_server_method_alloc(int version,int vendor,EapType method,const char * name)71 struct eap_method * eap_server_method_alloc(int version, int vendor,
72 EapType method, const char *name)
73 {
74 struct eap_method *eap;
75 eap = os_zalloc(sizeof(*eap));
76 if (eap == NULL)
77 return NULL;
78 eap->version = version;
79 eap->vendor = vendor;
80 eap->method = method;
81 eap->name = name;
82 return eap;
83 }
84
85
86 /**
87 * eap_server_method_free - Free EAP server method structure
88 * @method: Method structure allocated with eap_server_method_alloc()
89 */
eap_server_method_free(struct eap_method * method)90 static void eap_server_method_free(struct eap_method *method)
91 {
92 os_free(method);
93 }
94
95
96 /**
97 * eap_server_method_register - Register an EAP server method
98 * @method: EAP method to register from eap_server_method_alloc()
99 * Returns: 0 on success, -1 on invalid method, or -2 if a matching EAP method
100 * has already been registered
101 *
102 * Each EAP server method needs to call this function to register itself as a
103 * supported EAP method. The caller must not free the allocated method data
104 * regardless of the return value.
105 */
eap_server_method_register(struct eap_method * method)106 int eap_server_method_register(struct eap_method *method)
107 {
108 struct eap_method *m, *last = NULL;
109
110 if (method == NULL || method->name == NULL ||
111 method->version != EAP_SERVER_METHOD_INTERFACE_VERSION) {
112 eap_server_method_free(method);
113 return -1;
114 }
115
116 for (m = eap_methods; m; m = m->next) {
117 if ((m->vendor == method->vendor &&
118 m->method == method->method) ||
119 os_strcmp(m->name, method->name) == 0) {
120 eap_server_method_free(method);
121 return -2;
122 }
123 last = m;
124 }
125
126 if (last)
127 last->next = method;
128 else
129 eap_methods = method;
130
131 return 0;
132 }
133
134
135 /**
136 * eap_server_unregister_methods - Unregister EAP server methods
137 *
138 * This function is called at program termination to unregister all EAP server
139 * methods.
140 */
eap_server_unregister_methods(void)141 void eap_server_unregister_methods(void)
142 {
143 struct eap_method *m;
144
145 while (eap_methods) {
146 m = eap_methods;
147 eap_methods = eap_methods->next;
148
149 if (m->free)
150 m->free(m);
151 else
152 eap_server_method_free(m);
153 }
154 }
155
156
157 /**
158 * eap_server_get_name - Get EAP method name for the given EAP type
159 * @vendor: EAP Vendor-Id (0 = IETF)
160 * @type: EAP method type
161 * Returns: EAP method name, e.g., TLS, or "unknown" if not found
162 *
163 * This function maps EAP type numbers into EAP type names based on the list of
164 * EAP methods included in the build.
165 */
eap_server_get_name(int vendor,EapType type)166 const char * eap_server_get_name(int vendor, EapType type)
167 {
168 struct eap_method *m;
169 if (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_EXPANDED)
170 return "expanded";
171 for (m = eap_methods; m; m = m->next) {
172 if (m->vendor == vendor && m->method == type)
173 return m->name;
174 }
175 return "unknown";
176 }
177