eap_server_identity.c revision 252726 
1/*
2 * hostapd / EAP-Identity
3 * Copyright (c) 2004-2006, 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
14
15struct eap_identity_data {
16	enum { CONTINUE, SUCCESS, FAILURE } state;
17	int pick_up;
18};
19
20
21static void * eap_identity_init(struct eap_sm *sm)
22{
23	struct eap_identity_data *data;
24
25	data = os_zalloc(sizeof(*data));
26	if (data == NULL)
27		return NULL;
28	data->state = CONTINUE;
29
30	return data;
31}
32
33
34static void * eap_identity_initPickUp(struct eap_sm *sm)
35{
36	struct eap_identity_data *data;
37	data = eap_identity_init(sm);
38	if (data) {
39		data->pick_up = 1;
40	}
41	return data;
42}
43
44
45static void eap_identity_reset(struct eap_sm *sm, void *priv)
46{
47	struct eap_identity_data *data = priv;
48	os_free(data);
49}
50
51
52static struct wpabuf * eap_identity_buildReq(struct eap_sm *sm, void *priv,
53					     u8 id)
54{
55	struct eap_identity_data *data = priv;
56	struct wpabuf *req;
57	const char *req_data;
58	size_t req_data_len;
59
60	if (sm->eapol_cb->get_eap_req_id_text) {
61		req_data = sm->eapol_cb->get_eap_req_id_text(sm->eapol_ctx,
62							     &req_data_len);
63	} else {
64		req_data = NULL;
65		req_data_len = 0;
66	}
67	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, req_data_len,
68			    EAP_CODE_REQUEST, id);
69	if (req == NULL) {
70		wpa_printf(MSG_ERROR, "EAP-Identity: Failed to allocate "
71			   "memory for request");
72		data->state = FAILURE;
73		return NULL;
74	}
75
76	wpabuf_put_data(req, req_data, req_data_len);
77
78	return req;
79}
80
81
82static Boolean eap_identity_check(struct eap_sm *sm, void *priv,
83				  struct wpabuf *respData)
84{
85	const u8 *pos;
86	size_t len;
87
88	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
89			       respData, &len);
90	if (pos == NULL) {
91		wpa_printf(MSG_INFO, "EAP-Identity: Invalid frame");
92		return TRUE;
93	}
94
95	return FALSE;
96}
97
98
99static void eap_identity_process(struct eap_sm *sm, void *priv,
100				 struct wpabuf *respData)
101{
102	struct eap_identity_data *data = priv;
103	const u8 *pos;
104	size_t len;
105
106	if (data->pick_up) {
107		if (eap_identity_check(sm, data, respData)) {
108			wpa_printf(MSG_DEBUG, "EAP-Identity: failed to pick "
109				   "up already started negotiation");
110			data->state = FAILURE;
111			return;
112		}
113		data->pick_up = 0;
114	}
115
116	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
117			       respData, &len);
118	if (pos == NULL)
119		return; /* Should not happen - frame already validated */
120
121	wpa_hexdump_ascii(MSG_DEBUG, "EAP-Identity: Peer identity", pos, len);
122	if (sm->identity)
123		sm->update_user = TRUE;
124	os_free(sm->identity);
125	sm->identity = os_malloc(len ? len : 1);
126	if (sm->identity == NULL) {
127		data->state = FAILURE;
128	} else {
129		os_memcpy(sm->identity, pos, len);
130		sm->identity_len = len;
131		data->state = SUCCESS;
132	}
133}
134
135
136static Boolean eap_identity_isDone(struct eap_sm *sm, void *priv)
137{
138	struct eap_identity_data *data = priv;
139	return data->state != CONTINUE;
140}
141
142
143static Boolean eap_identity_isSuccess(struct eap_sm *sm, void *priv)
144{
145	struct eap_identity_data *data = priv;
146	return data->state == SUCCESS;
147}
148
149
150int eap_server_identity_register(void)
151{
152	struct eap_method *eap;
153	int ret;
154
155	eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
156				      EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
157				      "Identity");
158	if (eap == NULL)
159		return -1;
160
161	eap->init = eap_identity_init;
162	eap->initPickUp = eap_identity_initPickUp;
163	eap->reset = eap_identity_reset;
164	eap->buildReq = eap_identity_buildReq;
165	eap->check = eap_identity_check;
166	eap->process = eap_identity_process;
167	eap->isDone = eap_identity_isDone;
168	eap->isSuccess = eap_identity_isSuccess;
169
170	ret = eap_server_method_register(eap);
171	if (ret)
172		eap_server_method_free(eap);
173	return ret;
174}
175