Line data Source code
1 : /*
2 : * EAP peer method: LEAP
3 : * Copyright (c) 2004-2007, 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 "crypto/ms_funcs.h"
13 : #include "crypto/crypto.h"
14 : #include "crypto/random.h"
15 : #include "eap_i.h"
16 :
17 : #define LEAP_VERSION 1
18 : #define LEAP_CHALLENGE_LEN 8
19 : #define LEAP_RESPONSE_LEN 24
20 : #define LEAP_KEY_LEN 16
21 :
22 :
23 : struct eap_leap_data {
24 : enum {
25 : LEAP_WAIT_CHALLENGE,
26 : LEAP_WAIT_SUCCESS,
27 : LEAP_WAIT_RESPONSE,
28 : LEAP_DONE
29 : } state;
30 :
31 : u8 peer_challenge[LEAP_CHALLENGE_LEN];
32 : u8 peer_response[LEAP_RESPONSE_LEN];
33 :
34 : u8 ap_challenge[LEAP_CHALLENGE_LEN];
35 : u8 ap_response[LEAP_RESPONSE_LEN];
36 : };
37 :
38 :
39 0 : static void * eap_leap_init(struct eap_sm *sm)
40 : {
41 : struct eap_leap_data *data;
42 :
43 0 : data = os_zalloc(sizeof(*data));
44 0 : if (data == NULL)
45 0 : return NULL;
46 0 : data->state = LEAP_WAIT_CHALLENGE;
47 :
48 0 : sm->leap_done = FALSE;
49 0 : return data;
50 : }
51 :
52 :
53 0 : static void eap_leap_deinit(struct eap_sm *sm, void *priv)
54 : {
55 0 : os_free(priv);
56 0 : }
57 :
58 :
59 0 : static struct wpabuf * eap_leap_process_request(struct eap_sm *sm, void *priv,
60 : struct eap_method_ret *ret,
61 : const struct wpabuf *reqData)
62 : {
63 0 : struct eap_leap_data *data = priv;
64 : struct wpabuf *resp;
65 : const u8 *pos, *challenge, *identity, *password;
66 : u8 challenge_len, *rpos;
67 : size_t identity_len, password_len, len;
68 : int pwhash;
69 :
70 0 : wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Request");
71 :
72 0 : identity = eap_get_config_identity(sm, &identity_len);
73 0 : password = eap_get_config_password2(sm, &password_len, &pwhash);
74 0 : if (identity == NULL || password == NULL)
75 0 : return NULL;
76 :
77 0 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_LEAP, reqData, &len);
78 0 : if (pos == NULL || len < 3) {
79 0 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid EAP-Request frame");
80 0 : ret->ignore = TRUE;
81 0 : return NULL;
82 : }
83 :
84 0 : if (*pos != LEAP_VERSION) {
85 0 : wpa_printf(MSG_WARNING, "EAP-LEAP: Unsupported LEAP version "
86 0 : "%d", *pos);
87 0 : ret->ignore = TRUE;
88 0 : return NULL;
89 : }
90 0 : pos++;
91 :
92 0 : pos++; /* skip unused byte */
93 :
94 0 : challenge_len = *pos++;
95 0 : if (challenge_len != LEAP_CHALLENGE_LEN || challenge_len > len - 3) {
96 0 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid challenge "
97 : "(challenge_len=%d reqDataLen=%lu)",
98 : challenge_len, (unsigned long) wpabuf_len(reqData));
99 0 : ret->ignore = TRUE;
100 0 : return NULL;
101 : }
102 0 : challenge = pos;
103 0 : os_memcpy(data->peer_challenge, challenge, LEAP_CHALLENGE_LEN);
104 0 : wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Challenge from AP",
105 : challenge, LEAP_CHALLENGE_LEN);
106 :
107 0 : wpa_printf(MSG_DEBUG, "EAP-LEAP: Generating Challenge Response");
108 :
109 0 : resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_LEAP,
110 : 3 + LEAP_RESPONSE_LEN + identity_len,
111 0 : EAP_CODE_RESPONSE, eap_get_id(reqData));
112 0 : if (resp == NULL)
113 0 : return NULL;
114 0 : wpabuf_put_u8(resp, LEAP_VERSION);
115 0 : wpabuf_put_u8(resp, 0); /* unused */
116 0 : wpabuf_put_u8(resp, LEAP_RESPONSE_LEN);
117 0 : rpos = wpabuf_put(resp, LEAP_RESPONSE_LEN);
118 0 : if (pwhash)
119 0 : challenge_response(challenge, password, rpos);
120 : else
121 0 : nt_challenge_response(challenge, password, password_len, rpos);
122 0 : os_memcpy(data->peer_response, rpos, LEAP_RESPONSE_LEN);
123 0 : wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Response",
124 : rpos, LEAP_RESPONSE_LEN);
125 0 : wpabuf_put_data(resp, identity, identity_len);
126 :
127 0 : data->state = LEAP_WAIT_SUCCESS;
128 :
129 0 : return resp;
130 : }
131 :
132 :
133 0 : static struct wpabuf * eap_leap_process_success(struct eap_sm *sm, void *priv,
134 : struct eap_method_ret *ret,
135 : const struct wpabuf *reqData)
136 : {
137 0 : struct eap_leap_data *data = priv;
138 : struct wpabuf *resp;
139 : u8 *pos;
140 : const u8 *identity;
141 : size_t identity_len;
142 :
143 0 : wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Success");
144 :
145 0 : identity = eap_get_config_identity(sm, &identity_len);
146 0 : if (identity == NULL)
147 0 : return NULL;
148 :
149 0 : if (data->state != LEAP_WAIT_SUCCESS) {
150 0 : wpa_printf(MSG_INFO, "EAP-LEAP: EAP-Success received in "
151 0 : "unexpected state (%d) - ignored", data->state);
152 0 : ret->ignore = TRUE;
153 0 : return NULL;
154 : }
155 :
156 0 : resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_LEAP,
157 : 3 + LEAP_CHALLENGE_LEN + identity_len,
158 0 : EAP_CODE_REQUEST, eap_get_id(reqData));
159 0 : if (resp == NULL)
160 0 : return NULL;
161 0 : wpabuf_put_u8(resp, LEAP_VERSION);
162 0 : wpabuf_put_u8(resp, 0); /* unused */
163 0 : wpabuf_put_u8(resp, LEAP_CHALLENGE_LEN);
164 0 : pos = wpabuf_put(resp, LEAP_CHALLENGE_LEN);
165 0 : if (random_get_bytes(pos, LEAP_CHALLENGE_LEN)) {
166 0 : wpa_printf(MSG_WARNING, "EAP-LEAP: Failed to read random data "
167 : "for challenge");
168 0 : wpabuf_free(resp);
169 0 : ret->ignore = TRUE;
170 0 : return NULL;
171 : }
172 0 : os_memcpy(data->ap_challenge, pos, LEAP_CHALLENGE_LEN);
173 0 : wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Challenge to AP/AS", pos,
174 : LEAP_CHALLENGE_LEN);
175 0 : wpabuf_put_data(resp, identity, identity_len);
176 :
177 0 : data->state = LEAP_WAIT_RESPONSE;
178 :
179 0 : return resp;
180 : }
181 :
182 :
183 0 : static struct wpabuf * eap_leap_process_response(struct eap_sm *sm, void *priv,
184 : struct eap_method_ret *ret,
185 : const struct wpabuf *reqData)
186 : {
187 0 : struct eap_leap_data *data = priv;
188 : const u8 *pos, *password;
189 : u8 response_len, pw_hash[16], pw_hash_hash[16],
190 : expected[LEAP_RESPONSE_LEN];
191 : size_t password_len, len;
192 : int pwhash;
193 :
194 0 : wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Response");
195 :
196 0 : password = eap_get_config_password2(sm, &password_len, &pwhash);
197 0 : if (password == NULL)
198 0 : return NULL;
199 :
200 0 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_LEAP, reqData, &len);
201 0 : if (pos == NULL || len < 3) {
202 0 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid EAP-Response frame");
203 0 : ret->ignore = TRUE;
204 0 : return NULL;
205 : }
206 :
207 0 : if (*pos != LEAP_VERSION) {
208 0 : wpa_printf(MSG_WARNING, "EAP-LEAP: Unsupported LEAP version "
209 0 : "%d", *pos);
210 0 : ret->ignore = TRUE;
211 0 : return NULL;
212 : }
213 0 : pos++;
214 :
215 0 : pos++; /* skip unused byte */
216 :
217 0 : response_len = *pos++;
218 0 : if (response_len != LEAP_RESPONSE_LEN || response_len > len - 3) {
219 0 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid response "
220 : "(response_len=%d reqDataLen=%lu)",
221 : response_len, (unsigned long) wpabuf_len(reqData));
222 0 : ret->ignore = TRUE;
223 0 : return NULL;
224 : }
225 :
226 0 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: Response from AP",
227 : pos, LEAP_RESPONSE_LEN);
228 0 : os_memcpy(data->ap_response, pos, LEAP_RESPONSE_LEN);
229 :
230 0 : if (pwhash) {
231 0 : if (hash_nt_password_hash(password, pw_hash_hash)) {
232 0 : ret->ignore = TRUE;
233 0 : return NULL;
234 : }
235 : } else {
236 0 : if (nt_password_hash(password, password_len, pw_hash) ||
237 0 : hash_nt_password_hash(pw_hash, pw_hash_hash)) {
238 0 : ret->ignore = TRUE;
239 0 : return NULL;
240 : }
241 : }
242 0 : challenge_response(data->ap_challenge, pw_hash_hash, expected);
243 :
244 0 : ret->methodState = METHOD_DONE;
245 0 : ret->allowNotifications = FALSE;
246 :
247 0 : if (os_memcmp(pos, expected, LEAP_RESPONSE_LEN) != 0) {
248 0 : wpa_printf(MSG_WARNING, "EAP-LEAP: AP sent an invalid "
249 : "response - authentication failed");
250 0 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: Expected response from AP",
251 : expected, LEAP_RESPONSE_LEN);
252 0 : ret->decision = DECISION_FAIL;
253 0 : return NULL;
254 : }
255 :
256 0 : ret->decision = DECISION_UNCOND_SUCC;
257 :
258 : /* LEAP is somewhat odd method since it sends EAP-Success in the middle
259 : * of the authentication. Use special variable to transit EAP state
260 : * machine to SUCCESS state. */
261 0 : sm->leap_done = TRUE;
262 0 : data->state = LEAP_DONE;
263 :
264 : /* No more authentication messages expected; AP will send EAPOL-Key
265 : * frames if encryption is enabled. */
266 0 : return NULL;
267 : }
268 :
269 :
270 0 : static struct wpabuf * eap_leap_process(struct eap_sm *sm, void *priv,
271 : struct eap_method_ret *ret,
272 : const struct wpabuf *reqData)
273 : {
274 : const struct eap_hdr *eap;
275 : size_t password_len;
276 : const u8 *password;
277 :
278 0 : password = eap_get_config_password(sm, &password_len);
279 0 : if (password == NULL) {
280 0 : wpa_printf(MSG_INFO, "EAP-LEAP: Password not configured");
281 0 : eap_sm_request_password(sm);
282 0 : ret->ignore = TRUE;
283 0 : return NULL;
284 : }
285 :
286 : /*
287 : * LEAP needs to be able to handle EAP-Success frame which does not
288 : * include Type field. Consequently, eap_hdr_validate() cannot be used
289 : * here. This validation will be done separately for EAP-Request and
290 : * EAP-Response frames.
291 : */
292 0 : eap = wpabuf_head(reqData);
293 0 : if (wpabuf_len(reqData) < sizeof(*eap) ||
294 0 : be_to_host16(eap->length) > wpabuf_len(reqData)) {
295 0 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid frame");
296 0 : ret->ignore = TRUE;
297 0 : return NULL;
298 : }
299 :
300 0 : ret->ignore = FALSE;
301 0 : ret->allowNotifications = TRUE;
302 0 : ret->methodState = METHOD_MAY_CONT;
303 0 : ret->decision = DECISION_FAIL;
304 :
305 0 : sm->leap_done = FALSE;
306 :
307 0 : switch (eap->code) {
308 : case EAP_CODE_REQUEST:
309 0 : return eap_leap_process_request(sm, priv, ret, reqData);
310 : case EAP_CODE_SUCCESS:
311 0 : return eap_leap_process_success(sm, priv, ret, reqData);
312 : case EAP_CODE_RESPONSE:
313 0 : return eap_leap_process_response(sm, priv, ret, reqData);
314 : default:
315 0 : wpa_printf(MSG_INFO, "EAP-LEAP: Unexpected EAP code (%d) - "
316 0 : "ignored", eap->code);
317 0 : ret->ignore = TRUE;
318 0 : return NULL;
319 : }
320 : }
321 :
322 :
323 0 : static Boolean eap_leap_isKeyAvailable(struct eap_sm *sm, void *priv)
324 : {
325 0 : struct eap_leap_data *data = priv;
326 0 : return data->state == LEAP_DONE;
327 : }
328 :
329 :
330 0 : static u8 * eap_leap_getKey(struct eap_sm *sm, void *priv, size_t *len)
331 : {
332 0 : struct eap_leap_data *data = priv;
333 : u8 *key, pw_hash_hash[16], pw_hash[16];
334 : const u8 *addr[5], *password;
335 : size_t elen[5], password_len;
336 : int pwhash;
337 :
338 0 : if (data->state != LEAP_DONE)
339 0 : return NULL;
340 :
341 0 : password = eap_get_config_password2(sm, &password_len, &pwhash);
342 0 : if (password == NULL)
343 0 : return NULL;
344 :
345 0 : key = os_malloc(LEAP_KEY_LEN);
346 0 : if (key == NULL)
347 0 : return NULL;
348 :
349 0 : if (pwhash) {
350 0 : if (hash_nt_password_hash(password, pw_hash_hash)) {
351 0 : os_free(key);
352 0 : return NULL;
353 : }
354 : } else {
355 0 : if (nt_password_hash(password, password_len, pw_hash) ||
356 0 : hash_nt_password_hash(pw_hash, pw_hash_hash)) {
357 0 : os_free(key);
358 0 : return NULL;
359 : }
360 : }
361 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-LEAP: pw_hash_hash",
362 : pw_hash_hash, 16);
363 0 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: peer_challenge",
364 0 : data->peer_challenge, LEAP_CHALLENGE_LEN);
365 0 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: peer_response",
366 0 : data->peer_response, LEAP_RESPONSE_LEN);
367 0 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: ap_challenge",
368 0 : data->ap_challenge, LEAP_CHALLENGE_LEN);
369 0 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: ap_response",
370 0 : data->ap_response, LEAP_RESPONSE_LEN);
371 :
372 0 : addr[0] = pw_hash_hash;
373 0 : elen[0] = 16;
374 0 : addr[1] = data->ap_challenge;
375 0 : elen[1] = LEAP_CHALLENGE_LEN;
376 0 : addr[2] = data->ap_response;
377 0 : elen[2] = LEAP_RESPONSE_LEN;
378 0 : addr[3] = data->peer_challenge;
379 0 : elen[3] = LEAP_CHALLENGE_LEN;
380 0 : addr[4] = data->peer_response;
381 0 : elen[4] = LEAP_RESPONSE_LEN;
382 0 : md5_vector(5, addr, elen, key);
383 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-LEAP: master key", key, LEAP_KEY_LEN);
384 0 : *len = LEAP_KEY_LEN;
385 :
386 0 : return key;
387 : }
388 :
389 :
390 4 : int eap_peer_leap_register(void)
391 : {
392 : struct eap_method *eap;
393 : int ret;
394 :
395 4 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
396 : EAP_VENDOR_IETF, EAP_TYPE_LEAP, "LEAP");
397 4 : if (eap == NULL)
398 0 : return -1;
399 :
400 4 : eap->init = eap_leap_init;
401 4 : eap->deinit = eap_leap_deinit;
402 4 : eap->process = eap_leap_process;
403 4 : eap->isKeyAvailable = eap_leap_isKeyAvailable;
404 4 : eap->getKey = eap_leap_getKey;
405 :
406 4 : ret = eap_peer_method_register(eap);
407 4 : if (ret)
408 0 : eap_peer_method_free(eap);
409 4 : return ret;
410 : }
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