Line data Source code
1 : /*
2 : * hostapd / EAP-GTC (RFC 3748)
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 :
15 : struct eap_gtc_data {
16 : enum { CONTINUE, SUCCESS, FAILURE } state;
17 : int prefix;
18 : };
19 :
20 :
21 8 : static void * eap_gtc_init(struct eap_sm *sm)
22 : {
23 : struct eap_gtc_data *data;
24 :
25 8 : data = os_zalloc(sizeof(*data));
26 8 : if (data == NULL)
27 0 : return NULL;
28 8 : data->state = CONTINUE;
29 :
30 : #ifdef EAP_SERVER_FAST
31 16 : if (sm->m && sm->m->vendor == EAP_VENDOR_IETF &&
32 8 : sm->m->method == EAP_TYPE_FAST) {
33 4 : wpa_printf(MSG_DEBUG, "EAP-GTC: EAP-FAST tunnel - use prefix "
34 : "with challenge/response");
35 4 : data->prefix = 1;
36 : }
37 : #endif /* EAP_SERVER_FAST */
38 :
39 8 : return data;
40 : }
41 :
42 :
43 8 : static void eap_gtc_reset(struct eap_sm *sm, void *priv)
44 : {
45 8 : struct eap_gtc_data *data = priv;
46 8 : os_free(data);
47 8 : }
48 :
49 :
50 8 : static struct wpabuf * eap_gtc_buildReq(struct eap_sm *sm, void *priv, u8 id)
51 : {
52 8 : struct eap_gtc_data *data = priv;
53 : struct wpabuf *req;
54 : char *msg;
55 : size_t msg_len;
56 :
57 8 : msg = data->prefix ? "CHALLENGE=Password" : "Password";
58 :
59 8 : msg_len = os_strlen(msg);
60 8 : req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GTC, msg_len,
61 : EAP_CODE_REQUEST, id);
62 8 : if (req == NULL) {
63 0 : wpa_printf(MSG_ERROR, "EAP-GTC: Failed to allocate memory for "
64 : "request");
65 0 : data->state = FAILURE;
66 0 : return NULL;
67 : }
68 :
69 8 : wpabuf_put_data(req, msg, msg_len);
70 :
71 8 : data->state = CONTINUE;
72 :
73 8 : return req;
74 : }
75 :
76 :
77 8 : static Boolean eap_gtc_check(struct eap_sm *sm, void *priv,
78 : struct wpabuf *respData)
79 : {
80 : const u8 *pos;
81 : size_t len;
82 :
83 8 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GTC, respData, &len);
84 8 : if (pos == NULL || len < 1) {
85 0 : wpa_printf(MSG_INFO, "EAP-GTC: Invalid frame");
86 0 : return TRUE;
87 : }
88 :
89 8 : return FALSE;
90 : }
91 :
92 :
93 8 : static void eap_gtc_process(struct eap_sm *sm, void *priv,
94 : struct wpabuf *respData)
95 : {
96 8 : struct eap_gtc_data *data = priv;
97 : const u8 *pos;
98 : size_t rlen;
99 :
100 8 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GTC, respData, &rlen);
101 8 : if (pos == NULL || rlen < 1)
102 0 : return; /* Should not happen - frame already validated */
103 :
104 8 : wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-GTC: Response", pos, rlen);
105 :
106 : #ifdef EAP_SERVER_FAST
107 8 : if (data->prefix) {
108 : const u8 *pos2, *end;
109 : /* "RESPONSE=<user>\0<password>" */
110 4 : if (rlen < 10) {
111 0 : wpa_printf(MSG_DEBUG, "EAP-GTC: Too short response "
112 : "for EAP-FAST prefix");
113 0 : data->state = FAILURE;
114 0 : return;
115 : }
116 :
117 4 : end = pos + rlen;
118 4 : pos += 9;
119 4 : pos2 = pos;
120 24 : while (pos2 < end && *pos2)
121 16 : pos2++;
122 4 : if (pos2 == end) {
123 0 : wpa_printf(MSG_DEBUG, "EAP-GTC: No password in "
124 : "response to EAP-FAST prefix");
125 0 : data->state = FAILURE;
126 0 : return;
127 : }
128 :
129 4 : wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-GTC: Response user",
130 4 : pos, pos2 - pos);
131 5 : if (sm->identity && sm->require_identity_match &&
132 2 : (pos2 - pos != (int) sm->identity_len ||
133 1 : os_memcmp(pos, sm->identity, sm->identity_len))) {
134 0 : wpa_printf(MSG_DEBUG, "EAP-GTC: Phase 2 Identity did "
135 : "not match with required Identity");
136 0 : wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-GTC: Expected "
137 : "identity",
138 0 : sm->identity, sm->identity_len);
139 0 : data->state = FAILURE;
140 0 : return;
141 : } else {
142 4 : os_free(sm->identity);
143 4 : sm->identity_len = pos2 - pos;
144 4 : sm->identity = os_malloc(sm->identity_len);
145 4 : if (sm->identity == NULL) {
146 0 : data->state = FAILURE;
147 0 : return;
148 : }
149 4 : os_memcpy(sm->identity, pos, sm->identity_len);
150 : }
151 :
152 4 : if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
153 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-GTC: Phase2 "
154 : "Identity not found in the user "
155 : "database",
156 0 : sm->identity, sm->identity_len);
157 0 : data->state = FAILURE;
158 0 : return;
159 : }
160 :
161 4 : pos = pos2 + 1;
162 4 : rlen = end - pos;
163 4 : wpa_hexdump_ascii_key(MSG_MSGDUMP,
164 : "EAP-GTC: Response password",
165 : pos, rlen);
166 : }
167 : #endif /* EAP_SERVER_FAST */
168 :
169 16 : if (sm->user == NULL || sm->user->password == NULL ||
170 8 : sm->user->password_hash) {
171 0 : wpa_printf(MSG_INFO, "EAP-GTC: Plaintext password not "
172 : "configured");
173 0 : data->state = FAILURE;
174 0 : return;
175 : }
176 :
177 16 : if (rlen != sm->user->password_len ||
178 8 : os_memcmp(pos, sm->user->password, rlen) != 0) {
179 0 : wpa_printf(MSG_DEBUG, "EAP-GTC: Done - Failure");
180 0 : data->state = FAILURE;
181 : } else {
182 8 : wpa_printf(MSG_DEBUG, "EAP-GTC: Done - Success");
183 8 : data->state = SUCCESS;
184 : }
185 : }
186 :
187 :
188 8 : static Boolean eap_gtc_isDone(struct eap_sm *sm, void *priv)
189 : {
190 8 : struct eap_gtc_data *data = priv;
191 8 : return data->state != CONTINUE;
192 : }
193 :
194 :
195 8 : static Boolean eap_gtc_isSuccess(struct eap_sm *sm, void *priv)
196 : {
197 8 : struct eap_gtc_data *data = priv;
198 8 : return data->state == SUCCESS;
199 : }
200 :
201 :
202 2 : int eap_server_gtc_register(void)
203 : {
204 : struct eap_method *eap;
205 : int ret;
206 :
207 2 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
208 : EAP_VENDOR_IETF, EAP_TYPE_GTC, "GTC");
209 2 : if (eap == NULL)
210 0 : return -1;
211 :
212 2 : eap->init = eap_gtc_init;
213 2 : eap->reset = eap_gtc_reset;
214 2 : eap->buildReq = eap_gtc_buildReq;
215 2 : eap->check = eap_gtc_check;
216 2 : eap->process = eap_gtc_process;
217 2 : eap->isDone = eap_gtc_isDone;
218 2 : eap->isSuccess = eap_gtc_isSuccess;
219 :
220 2 : ret = eap_server_method_register(eap);
221 2 : if (ret)
222 0 : eap_server_method_free(eap);
223 2 : return ret;
224 : }
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