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 12 : static void * eap_leap_init(struct eap_sm *sm)
40 : {
41 : struct eap_leap_data *data;
42 :
43 12 : data = os_zalloc(sizeof(*data));
44 12 : if (data == NULL)
45 0 : return NULL;
46 12 : data->state = LEAP_WAIT_CHALLENGE;
47 :
48 12 : sm->leap_done = FALSE;
49 12 : return data;
50 : }
51 :
52 :
53 12 : static void eap_leap_deinit(struct eap_sm *sm, void *priv)
54 : {
55 12 : os_free(priv);
56 12 : }
57 :
58 :
59 12 : 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 12 : 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 12 : wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Request");
71 :
72 12 : identity = eap_get_config_identity(sm, &identity_len);
73 12 : password = eap_get_config_password2(sm, &password_len, &pwhash);
74 12 : if (identity == NULL || password == NULL)
75 0 : return NULL;
76 :
77 12 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_LEAP, reqData, &len);
78 12 : if (pos == NULL || len < 3) {
79 1 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid EAP-Request frame");
80 1 : ret->ignore = TRUE;
81 1 : return NULL;
82 : }
83 :
84 11 : if (*pos != LEAP_VERSION) {
85 1 : wpa_printf(MSG_WARNING, "EAP-LEAP: Unsupported LEAP version "
86 1 : "%d", *pos);
87 1 : ret->ignore = TRUE;
88 1 : return NULL;
89 : }
90 10 : pos++;
91 :
92 10 : pos++; /* skip unused byte */
93 :
94 10 : challenge_len = *pos++;
95 10 : if (challenge_len != LEAP_CHALLENGE_LEN || challenge_len > len - 3) {
96 2 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid challenge "
97 : "(challenge_len=%d reqDataLen=%lu)",
98 : challenge_len, (unsigned long) wpabuf_len(reqData));
99 2 : ret->ignore = TRUE;
100 2 : return NULL;
101 : }
102 8 : challenge = pos;
103 8 : os_memcpy(data->peer_challenge, challenge, LEAP_CHALLENGE_LEN);
104 8 : wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Challenge from AP",
105 : challenge, LEAP_CHALLENGE_LEN);
106 :
107 8 : wpa_printf(MSG_DEBUG, "EAP-LEAP: Generating Challenge Response");
108 :
109 8 : resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_LEAP,
110 : 3 + LEAP_RESPONSE_LEN + identity_len,
111 8 : EAP_CODE_RESPONSE, eap_get_id(reqData));
112 8 : if (resp == NULL)
113 0 : return NULL;
114 8 : wpabuf_put_u8(resp, LEAP_VERSION);
115 8 : wpabuf_put_u8(resp, 0); /* unused */
116 8 : wpabuf_put_u8(resp, LEAP_RESPONSE_LEN);
117 8 : rpos = wpabuf_put(resp, LEAP_RESPONSE_LEN);
118 8 : if (pwhash)
119 0 : challenge_response(challenge, password, rpos);
120 : else
121 8 : nt_challenge_response(challenge, password, password_len, rpos);
122 8 : os_memcpy(data->peer_response, rpos, LEAP_RESPONSE_LEN);
123 8 : wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Response",
124 : rpos, LEAP_RESPONSE_LEN);
125 8 : wpabuf_put_data(resp, identity, identity_len);
126 :
127 8 : data->state = LEAP_WAIT_SUCCESS;
128 :
129 8 : return resp;
130 : }
131 :
132 :
133 1 : 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 1 : struct eap_leap_data *data = priv;
138 : struct wpabuf *resp;
139 : u8 *pos;
140 : const u8 *identity;
141 : size_t identity_len;
142 :
143 1 : wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Success");
144 :
145 1 : identity = eap_get_config_identity(sm, &identity_len);
146 1 : if (identity == NULL)
147 0 : return NULL;
148 :
149 1 : 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 1 : resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_LEAP,
157 : 3 + LEAP_CHALLENGE_LEN + identity_len,
158 1 : EAP_CODE_REQUEST, eap_get_id(reqData));
159 1 : if (resp == NULL)
160 0 : return NULL;
161 1 : wpabuf_put_u8(resp, LEAP_VERSION);
162 1 : wpabuf_put_u8(resp, 0); /* unused */
163 1 : wpabuf_put_u8(resp, LEAP_CHALLENGE_LEN);
164 1 : pos = wpabuf_put(resp, LEAP_CHALLENGE_LEN);
165 1 : 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 1 : os_memcpy(data->ap_challenge, pos, LEAP_CHALLENGE_LEN);
173 1 : wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Challenge to AP/AS", pos,
174 : LEAP_CHALLENGE_LEN);
175 1 : wpabuf_put_data(resp, identity, identity_len);
176 :
177 1 : data->state = LEAP_WAIT_RESPONSE;
178 :
179 1 : return resp;
180 : }
181 :
182 :
183 6 : 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 6 : 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 6 : wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Response");
195 :
196 6 : password = eap_get_config_password2(sm, &password_len, &pwhash);
197 6 : if (password == NULL)
198 0 : return NULL;
199 :
200 6 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_LEAP, reqData, &len);
201 6 : if (pos == NULL || len < 3) {
202 1 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid EAP-Response frame");
203 1 : ret->ignore = TRUE;
204 1 : return NULL;
205 : }
206 :
207 5 : if (*pos != LEAP_VERSION) {
208 1 : wpa_printf(MSG_WARNING, "EAP-LEAP: Unsupported LEAP version "
209 1 : "%d", *pos);
210 1 : ret->ignore = TRUE;
211 1 : return NULL;
212 : }
213 4 : pos++;
214 :
215 4 : pos++; /* skip unused byte */
216 :
217 4 : response_len = *pos++;
218 4 : if (response_len != LEAP_RESPONSE_LEN || response_len > len - 3) {
219 2 : wpa_printf(MSG_INFO, "EAP-LEAP: Invalid response "
220 : "(response_len=%d reqDataLen=%lu)",
221 : response_len, (unsigned long) wpabuf_len(reqData));
222 2 : ret->ignore = TRUE;
223 2 : return NULL;
224 : }
225 :
226 2 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: Response from AP",
227 : pos, LEAP_RESPONSE_LEN);
228 2 : os_memcpy(data->ap_response, pos, LEAP_RESPONSE_LEN);
229 :
230 2 : 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 4 : if (nt_password_hash(password, password_len, pw_hash) ||
237 2 : hash_nt_password_hash(pw_hash, pw_hash_hash)) {
238 0 : ret->ignore = TRUE;
239 0 : return NULL;
240 : }
241 : }
242 2 : challenge_response(data->ap_challenge, pw_hash_hash, expected);
243 :
244 2 : ret->methodState = METHOD_DONE;
245 2 : ret->allowNotifications = FALSE;
246 :
247 2 : if (os_memcmp_const(pos, expected, LEAP_RESPONSE_LEN) != 0) {
248 1 : wpa_printf(MSG_WARNING, "EAP-LEAP: AP sent an invalid "
249 : "response - authentication failed");
250 1 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: Expected response from AP",
251 : expected, LEAP_RESPONSE_LEN);
252 1 : ret->decision = DECISION_FAIL;
253 1 : return NULL;
254 : }
255 :
256 1 : 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 1 : sm->leap_done = TRUE;
262 1 : data->state = LEAP_DONE;
263 :
264 : /* No more authentication messages expected; AP will send EAPOL-Key
265 : * frames if encryption is enabled. */
266 1 : return NULL;
267 : }
268 :
269 :
270 19 : 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 19 : password = eap_get_config_password(sm, &password_len);
279 19 : 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 19 : eap = wpabuf_head(reqData);
293 38 : if (wpabuf_len(reqData) < sizeof(*eap) ||
294 19 : 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 19 : ret->ignore = FALSE;
301 19 : ret->allowNotifications = TRUE;
302 19 : ret->methodState = METHOD_MAY_CONT;
303 19 : ret->decision = DECISION_FAIL;
304 :
305 19 : sm->leap_done = FALSE;
306 :
307 19 : switch (eap->code) {
308 : case EAP_CODE_REQUEST:
309 12 : return eap_leap_process_request(sm, priv, ret, reqData);
310 : case EAP_CODE_SUCCESS:
311 1 : return eap_leap_process_success(sm, priv, ret, reqData);
312 : case EAP_CODE_RESPONSE:
313 6 : 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 11 : static Boolean eap_leap_isKeyAvailable(struct eap_sm *sm, void *priv)
324 : {
325 11 : struct eap_leap_data *data = priv;
326 11 : return data->state == LEAP_DONE;
327 : }
328 :
329 :
330 1 : static u8 * eap_leap_getKey(struct eap_sm *sm, void *priv, size_t *len)
331 : {
332 1 : 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 1 : if (data->state != LEAP_DONE)
339 0 : return NULL;
340 :
341 1 : password = eap_get_config_password2(sm, &password_len, &pwhash);
342 1 : if (password == NULL)
343 0 : return NULL;
344 :
345 1 : key = os_malloc(LEAP_KEY_LEN);
346 1 : if (key == NULL)
347 0 : return NULL;
348 :
349 1 : 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 2 : if (nt_password_hash(password, password_len, pw_hash) ||
356 1 : hash_nt_password_hash(pw_hash, pw_hash_hash)) {
357 0 : os_free(key);
358 0 : return NULL;
359 : }
360 : }
361 1 : wpa_hexdump_key(MSG_DEBUG, "EAP-LEAP: pw_hash_hash",
362 : pw_hash_hash, 16);
363 1 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: peer_challenge",
364 1 : data->peer_challenge, LEAP_CHALLENGE_LEN);
365 1 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: peer_response",
366 1 : data->peer_response, LEAP_RESPONSE_LEN);
367 1 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: ap_challenge",
368 1 : data->ap_challenge, LEAP_CHALLENGE_LEN);
369 1 : wpa_hexdump(MSG_DEBUG, "EAP-LEAP: ap_response",
370 1 : data->ap_response, LEAP_RESPONSE_LEN);
371 :
372 1 : addr[0] = pw_hash_hash;
373 1 : elen[0] = 16;
374 1 : addr[1] = data->ap_challenge;
375 1 : elen[1] = LEAP_CHALLENGE_LEN;
376 1 : addr[2] = data->ap_response;
377 1 : elen[2] = LEAP_RESPONSE_LEN;
378 1 : addr[3] = data->peer_challenge;
379 1 : elen[3] = LEAP_CHALLENGE_LEN;
380 1 : addr[4] = data->peer_response;
381 1 : elen[4] = LEAP_RESPONSE_LEN;
382 1 : md5_vector(5, addr, elen, key);
383 1 : wpa_hexdump_key(MSG_DEBUG, "EAP-LEAP: master key", key, LEAP_KEY_LEN);
384 1 : *len = LEAP_KEY_LEN;
385 :
386 1 : os_memset(pw_hash, 0, sizeof(pw_hash));
387 1 : os_memset(pw_hash_hash, 0, sizeof(pw_hash_hash));
388 :
389 1 : return key;
390 : }
391 :
392 :
393 30 : int eap_peer_leap_register(void)
394 : {
395 : struct eap_method *eap;
396 : int ret;
397 :
398 30 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
399 : EAP_VENDOR_IETF, EAP_TYPE_LEAP, "LEAP");
400 30 : if (eap == NULL)
401 0 : return -1;
402 :
403 30 : eap->init = eap_leap_init;
404 30 : eap->deinit = eap_leap_deinit;
405 30 : eap->process = eap_leap_process;
406 30 : eap->isKeyAvailable = eap_leap_isKeyAvailable;
407 30 : eap->getKey = eap_leap_getKey;
408 :
409 30 : ret = eap_peer_method_register(eap);
410 30 : if (ret)
411 0 : eap_peer_method_free(eap);
412 30 : return ret;
413 : }
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