eap_server_identity.c revision 8d520ff1dc2da35cdca849e982051b86468016d8 
1/*
2 * hostapd / EAP-Identity
3 * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15#include "includes.h"
16
17#include "common.h"
18#include "eap_i.h"
19
20
21struct eap_identity_data {
22	enum { CONTINUE, SUCCESS, FAILURE } state;
23	int pick_up;
24};
25
26
27static void * eap_identity_init(struct eap_sm *sm)
28{
29	struct eap_identity_data *data;
30
31	data = os_zalloc(sizeof(*data));
32	if (data == NULL)
33		return NULL;
34	data->state = CONTINUE;
35
36	return data;
37}
38
39
40static void * eap_identity_initPickUp(struct eap_sm *sm)
41{
42	struct eap_identity_data *data;
43	data = eap_identity_init(sm);
44	if (data) {
45		data->pick_up = 1;
46	}
47	return data;
48}
49
50
51static void eap_identity_reset(struct eap_sm *sm, void *priv)
52{
53	struct eap_identity_data *data = priv;
54	os_free(data);
55}
56
57
58static struct wpabuf * eap_identity_buildReq(struct eap_sm *sm, void *priv,
59					     u8 id)
60{
61	struct eap_identity_data *data = priv;
62	struct wpabuf *req;
63	const char *req_data;
64	size_t req_data_len;
65
66	if (sm->eapol_cb->get_eap_req_id_text) {
67		req_data = sm->eapol_cb->get_eap_req_id_text(sm->eapol_ctx,
68							     &req_data_len);
69	} else {
70		req_data = NULL;
71		req_data_len = 0;
72	}
73	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, req_data_len,
74			    EAP_CODE_REQUEST, id);
75	if (req == NULL) {
76		wpa_printf(MSG_ERROR, "EAP-Identity: Failed to allocate "
77			   "memory for request");
78		data->state = FAILURE;
79		return NULL;
80	}
81
82	wpabuf_put_data(req, req_data, req_data_len);
83
84	return req;
85}
86
87
88static Boolean eap_identity_check(struct eap_sm *sm, void *priv,
89				  struct wpabuf *respData)
90{
91	const u8 *pos;
92	size_t len;
93
94	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
95			       respData, &len);
96	if (pos == NULL) {
97		wpa_printf(MSG_INFO, "EAP-Identity: Invalid frame");
98		return TRUE;
99	}
100
101	return FALSE;
102}
103
104
105static void eap_identity_process(struct eap_sm *sm, void *priv,
106				 struct wpabuf *respData)
107{
108	struct eap_identity_data *data = priv;
109	const u8 *pos;
110	size_t len;
111
112	if (data->pick_up) {
113		if (eap_identity_check(sm, data, respData)) {
114			wpa_printf(MSG_DEBUG, "EAP-Identity: failed to pick "
115				   "up already started negotiation");
116			data->state = FAILURE;
117			return;
118		}
119		data->pick_up = 0;
120	}
121
122	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
123			       respData, &len);
124	if (pos == NULL)
125		return; /* Should not happen - frame already validated */
126
127	wpa_hexdump_ascii(MSG_DEBUG, "EAP-Identity: Peer identity", pos, len);
128	if (sm->identity)
129		sm->update_user = TRUE;
130	os_free(sm->identity);
131	sm->identity = os_malloc(len ? len : 1);
132	if (sm->identity == NULL) {
133		data->state = FAILURE;
134	} else {
135		os_memcpy(sm->identity, pos, len);
136		sm->identity_len = len;
137		data->state = SUCCESS;
138	}
139}
140
141
142static Boolean eap_identity_isDone(struct eap_sm *sm, void *priv)
143{
144	struct eap_identity_data *data = priv;
145	return data->state != CONTINUE;
146}
147
148
149static Boolean eap_identity_isSuccess(struct eap_sm *sm, void *priv)
150{
151	struct eap_identity_data *data = priv;
152	return data->state == SUCCESS;
153}
154
155
156int eap_server_identity_register(void)
157{
158	struct eap_method *eap;
159	int ret;
160
161	eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
162				      EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
163				      "Identity");
164	if (eap == NULL)
165		return -1;
166
167	eap->init = eap_identity_init;
168	eap->initPickUp = eap_identity_initPickUp;
169	eap->reset = eap_identity_reset;
170	eap->buildReq = eap_identity_buildReq;
171	eap->check = eap_identity_check;
172	eap->process = eap_identity_process;
173	eap->isDone = eap_identity_isDone;
174	eap->isSuccess = eap_identity_isSuccess;
175
176	ret = eap_server_method_register(eap);
177	if (ret)
178		eap_server_method_free(eap);
179	return ret;
180}
181