Line data Source code
1 : /*
2 : * hostapd / EAP-PAX (RFC 4746) server
3 : * Copyright (c) 2005-2007, 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/random.h"
13 : #include "eap_server/eap_i.h"
14 : #include "eap_common/eap_pax_common.h"
15 :
16 : /*
17 : * Note: only PAX_STD subprotocol is currently supported
18 : *
19 : * TODO: Add support with PAX_SEC with the mandatory to implement ciphersuite
20 : * (HMAC_SHA1_128, IANA DH Group 14 (2048 bits), RSA-PKCS1-V1_5) and
21 : * recommended ciphersuite (HMAC_SHA256_128, IANA DH Group 15 (3072 bits),
22 : * RSAES-OAEP).
23 : */
24 :
25 : struct eap_pax_data {
26 : enum { PAX_STD_1, PAX_STD_3, SUCCESS, FAILURE } state;
27 : u8 mac_id;
28 : union {
29 : u8 e[2 * EAP_PAX_RAND_LEN];
30 : struct {
31 : u8 x[EAP_PAX_RAND_LEN]; /* server rand */
32 : u8 y[EAP_PAX_RAND_LEN]; /* client rand */
33 : } r;
34 : } rand;
35 : u8 ak[EAP_PAX_AK_LEN];
36 : u8 mk[EAP_PAX_MK_LEN];
37 : u8 ck[EAP_PAX_CK_LEN];
38 : u8 ick[EAP_PAX_ICK_LEN];
39 : u8 mid[EAP_PAX_MID_LEN];
40 : int keys_set;
41 : char *cid;
42 : size_t cid_len;
43 : };
44 :
45 :
46 39 : static void * eap_pax_init(struct eap_sm *sm)
47 : {
48 : struct eap_pax_data *data;
49 :
50 39 : data = os_zalloc(sizeof(*data));
51 39 : if (data == NULL)
52 0 : return NULL;
53 39 : data->state = PAX_STD_1;
54 : /*
55 : * TODO: make this configurable once EAP_PAX_HMAC_SHA256_128 is
56 : * supported
57 : */
58 39 : data->mac_id = EAP_PAX_MAC_HMAC_SHA1_128;
59 :
60 39 : return data;
61 : }
62 :
63 :
64 39 : static void eap_pax_reset(struct eap_sm *sm, void *priv)
65 : {
66 39 : struct eap_pax_data *data = priv;
67 39 : os_free(data->cid);
68 39 : bin_clear_free(data, sizeof(*data));
69 39 : }
70 :
71 :
72 39 : static struct wpabuf * eap_pax_build_std_1(struct eap_sm *sm,
73 : struct eap_pax_data *data, u8 id)
74 : {
75 : struct wpabuf *req;
76 : struct eap_pax_hdr *pax;
77 : u8 *pos;
78 :
79 39 : wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (sending)");
80 :
81 39 : if (random_get_bytes(data->rand.r.x, EAP_PAX_RAND_LEN)) {
82 0 : wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data");
83 0 : data->state = FAILURE;
84 0 : return NULL;
85 : }
86 :
87 39 : req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PAX,
88 : sizeof(*pax) + 2 + EAP_PAX_RAND_LEN +
89 : EAP_PAX_ICV_LEN, EAP_CODE_REQUEST, id);
90 39 : if (req == NULL) {
91 0 : wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory "
92 : "request");
93 0 : data->state = FAILURE;
94 0 : return NULL;
95 : }
96 :
97 39 : pax = wpabuf_put(req, sizeof(*pax));
98 39 : pax->op_code = EAP_PAX_OP_STD_1;
99 39 : pax->flags = 0;
100 39 : pax->mac_id = data->mac_id;
101 39 : pax->dh_group_id = EAP_PAX_DH_GROUP_NONE;
102 39 : pax->public_key_id = EAP_PAX_PUBLIC_KEY_NONE;
103 :
104 39 : wpabuf_put_be16(req, EAP_PAX_RAND_LEN);
105 39 : wpabuf_put_data(req, data->rand.r.x, EAP_PAX_RAND_LEN);
106 39 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: A = X (server rand)",
107 39 : data->rand.r.x, EAP_PAX_RAND_LEN);
108 :
109 39 : pos = wpabuf_put(req, EAP_PAX_MAC_LEN);
110 78 : eap_pax_mac(data->mac_id, (u8 *) "", 0,
111 78 : wpabuf_mhead(req), wpabuf_len(req) - EAP_PAX_ICV_LEN,
112 : NULL, 0, NULL, 0, pos);
113 39 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN);
114 :
115 39 : return req;
116 : }
117 :
118 :
119 38 : static struct wpabuf * eap_pax_build_std_3(struct eap_sm *sm,
120 : struct eap_pax_data *data, u8 id)
121 : {
122 : struct wpabuf *req;
123 : struct eap_pax_hdr *pax;
124 : u8 *pos;
125 :
126 38 : wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (sending)");
127 :
128 38 : req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PAX,
129 : sizeof(*pax) + 2 + EAP_PAX_MAC_LEN +
130 : EAP_PAX_ICV_LEN, EAP_CODE_REQUEST, id);
131 38 : if (req == NULL) {
132 0 : wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory "
133 : "request");
134 0 : data->state = FAILURE;
135 0 : return NULL;
136 : }
137 :
138 38 : pax = wpabuf_put(req, sizeof(*pax));
139 38 : pax->op_code = EAP_PAX_OP_STD_3;
140 38 : pax->flags = 0;
141 38 : pax->mac_id = data->mac_id;
142 38 : pax->dh_group_id = EAP_PAX_DH_GROUP_NONE;
143 38 : pax->public_key_id = EAP_PAX_PUBLIC_KEY_NONE;
144 :
145 38 : wpabuf_put_be16(req, EAP_PAX_MAC_LEN);
146 38 : pos = wpabuf_put(req, EAP_PAX_MAC_LEN);
147 76 : eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN,
148 38 : data->rand.r.y, EAP_PAX_RAND_LEN,
149 38 : (u8 *) data->cid, data->cid_len, NULL, 0, pos);
150 38 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)",
151 : pos, EAP_PAX_MAC_LEN);
152 :
153 : /* Optional ADE could be added here, if needed */
154 :
155 38 : pos = wpabuf_put(req, EAP_PAX_MAC_LEN);
156 76 : eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
157 76 : wpabuf_mhead(req), wpabuf_len(req) - EAP_PAX_ICV_LEN,
158 : NULL, 0, NULL, 0, pos);
159 38 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN);
160 :
161 38 : return req;
162 : }
163 :
164 :
165 77 : static struct wpabuf * eap_pax_buildReq(struct eap_sm *sm, void *priv, u8 id)
166 : {
167 77 : struct eap_pax_data *data = priv;
168 :
169 77 : switch (data->state) {
170 : case PAX_STD_1:
171 39 : return eap_pax_build_std_1(sm, data, id);
172 : case PAX_STD_3:
173 38 : return eap_pax_build_std_3(sm, data, id);
174 : default:
175 0 : wpa_printf(MSG_DEBUG, "EAP-PAX: Unknown state %d in buildReq",
176 0 : data->state);
177 0 : break;
178 : }
179 0 : return NULL;
180 : }
181 :
182 :
183 77 : static Boolean eap_pax_check(struct eap_sm *sm, void *priv,
184 : struct wpabuf *respData)
185 : {
186 77 : struct eap_pax_data *data = priv;
187 : struct eap_pax_hdr *resp;
188 : const u8 *pos;
189 : size_t len, mlen;
190 : u8 icvbuf[EAP_PAX_ICV_LEN], *icv;
191 :
192 77 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len);
193 77 : if (pos == NULL || len < sizeof(*resp)) {
194 0 : wpa_printf(MSG_INFO, "EAP-PAX: Invalid frame");
195 0 : return TRUE;
196 : }
197 :
198 77 : mlen = sizeof(struct eap_hdr) + 1 + len;
199 77 : resp = (struct eap_pax_hdr *) pos;
200 :
201 385 : wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x "
202 : "flags 0x%x mac_id 0x%x dh_group_id 0x%x "
203 : "public_key_id 0x%x",
204 308 : resp->op_code, resp->flags, resp->mac_id, resp->dh_group_id,
205 77 : resp->public_key_id);
206 77 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload",
207 77 : (u8 *) (resp + 1), len - sizeof(*resp) - EAP_PAX_ICV_LEN);
208 :
209 116 : if (data->state == PAX_STD_1 &&
210 39 : resp->op_code != EAP_PAX_OP_STD_2) {
211 0 : wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX_STD-2 - "
212 0 : "ignore op %d", resp->op_code);
213 0 : return TRUE;
214 : }
215 :
216 115 : if (data->state == PAX_STD_3 &&
217 38 : resp->op_code != EAP_PAX_OP_ACK) {
218 0 : wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX-ACK - "
219 0 : "ignore op %d", resp->op_code);
220 0 : return TRUE;
221 : }
222 :
223 115 : if (resp->op_code != EAP_PAX_OP_STD_2 &&
224 38 : resp->op_code != EAP_PAX_OP_ACK) {
225 0 : wpa_printf(MSG_DEBUG, "EAP-PAX: Unknown op_code 0x%x",
226 0 : resp->op_code);
227 : }
228 :
229 77 : if (data->mac_id != resp->mac_id) {
230 0 : wpa_printf(MSG_DEBUG, "EAP-PAX: Expected MAC ID 0x%x, "
231 0 : "received 0x%x", data->mac_id, resp->mac_id);
232 0 : return TRUE;
233 : }
234 :
235 77 : if (resp->dh_group_id != EAP_PAX_DH_GROUP_NONE) {
236 0 : wpa_printf(MSG_INFO, "EAP-PAX: Expected DH Group ID 0x%x, "
237 : "received 0x%x", EAP_PAX_DH_GROUP_NONE,
238 0 : resp->dh_group_id);
239 0 : return TRUE;
240 : }
241 :
242 77 : if (resp->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) {
243 0 : wpa_printf(MSG_INFO, "EAP-PAX: Expected Public Key ID 0x%x, "
244 : "received 0x%x", EAP_PAX_PUBLIC_KEY_NONE,
245 0 : resp->public_key_id);
246 0 : return TRUE;
247 : }
248 :
249 77 : if (resp->flags & EAP_PAX_FLAGS_MF) {
250 : /* TODO: add support for reassembling fragments */
251 0 : wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported");
252 0 : return TRUE;
253 : }
254 :
255 77 : if (resp->flags & EAP_PAX_FLAGS_CE) {
256 0 : wpa_printf(MSG_INFO, "EAP-PAX: Unexpected CE flag");
257 0 : return TRUE;
258 : }
259 :
260 77 : if (data->keys_set) {
261 38 : if (len - sizeof(*resp) < EAP_PAX_ICV_LEN) {
262 0 : wpa_printf(MSG_INFO, "EAP-PAX: No ICV in the packet");
263 0 : return TRUE;
264 : }
265 38 : icv = wpabuf_mhead_u8(respData) + mlen - EAP_PAX_ICV_LEN;
266 38 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN);
267 76 : eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
268 38 : wpabuf_mhead(respData),
269 38 : wpabuf_len(respData) - EAP_PAX_ICV_LEN,
270 : NULL, 0, NULL, 0, icvbuf);
271 38 : if (os_memcmp_const(icvbuf, icv, EAP_PAX_ICV_LEN) != 0) {
272 0 : wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV");
273 0 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV",
274 : icvbuf, EAP_PAX_ICV_LEN);
275 0 : return TRUE;
276 : }
277 : }
278 :
279 77 : return FALSE;
280 : }
281 :
282 :
283 39 : static void eap_pax_process_std_2(struct eap_sm *sm,
284 : struct eap_pax_data *data,
285 : struct wpabuf *respData)
286 : {
287 : struct eap_pax_hdr *resp;
288 : u8 mac[EAP_PAX_MAC_LEN], icvbuf[EAP_PAX_ICV_LEN];
289 : const u8 *pos;
290 : size_t len, left, cid_len;
291 : int i;
292 :
293 39 : if (data->state != PAX_STD_1)
294 1 : return;
295 :
296 39 : wpa_printf(MSG_DEBUG, "EAP-PAX: Received PAX_STD-2");
297 :
298 39 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len);
299 39 : if (pos == NULL || len < sizeof(*resp) + EAP_PAX_ICV_LEN)
300 0 : return;
301 :
302 39 : resp = (struct eap_pax_hdr *) pos;
303 39 : pos = (u8 *) (resp + 1);
304 39 : left = len - sizeof(*resp);
305 :
306 78 : if (left < 2 + EAP_PAX_RAND_LEN ||
307 39 : WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) {
308 0 : wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (B)");
309 0 : return;
310 : }
311 39 : pos += 2;
312 39 : left -= 2;
313 39 : os_memcpy(data->rand.r.y, pos, EAP_PAX_RAND_LEN);
314 39 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)",
315 39 : data->rand.r.y, EAP_PAX_RAND_LEN);
316 39 : pos += EAP_PAX_RAND_LEN;
317 39 : left -= EAP_PAX_RAND_LEN;
318 :
319 39 : if (left < 2 || (size_t) 2 + WPA_GET_BE16(pos) > left) {
320 0 : wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (CID)");
321 0 : return;
322 : }
323 39 : cid_len = WPA_GET_BE16(pos);
324 39 : if (cid_len > 1500) {
325 0 : wpa_printf(MSG_INFO, "EAP-PAX: Too long CID");
326 0 : return;
327 : }
328 39 : data->cid_len = cid_len;
329 39 : os_free(data->cid);
330 39 : data->cid = os_malloc(data->cid_len);
331 39 : if (data->cid == NULL) {
332 0 : wpa_printf(MSG_INFO, "EAP-PAX: Failed to allocate memory for "
333 : "CID");
334 0 : return;
335 : }
336 39 : os_memcpy(data->cid, pos + 2, data->cid_len);
337 39 : pos += 2 + data->cid_len;
338 39 : left -= 2 + data->cid_len;
339 78 : wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID",
340 39 : (u8 *) data->cid, data->cid_len);
341 :
342 78 : if (left < 2 + EAP_PAX_MAC_LEN ||
343 39 : WPA_GET_BE16(pos) != EAP_PAX_MAC_LEN) {
344 0 : wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (MAC_CK)");
345 0 : return;
346 : }
347 39 : pos += 2;
348 39 : left -= 2;
349 39 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)",
350 : pos, EAP_PAX_MAC_LEN);
351 :
352 39 : if (eap_user_get(sm, (u8 *) data->cid, data->cid_len, 0) < 0) {
353 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: unknown CID",
354 0 : (u8 *) data->cid, data->cid_len);
355 0 : data->state = FAILURE;
356 0 : return;
357 : }
358 :
359 78 : for (i = 0;
360 39 : i < EAP_MAX_METHODS &&
361 78 : (sm->user->methods[i].vendor != EAP_VENDOR_IETF ||
362 39 : sm->user->methods[i].method != EAP_TYPE_NONE);
363 0 : i++) {
364 78 : if (sm->user->methods[i].vendor == EAP_VENDOR_IETF &&
365 39 : sm->user->methods[i].method == EAP_TYPE_PAX)
366 39 : break;
367 : }
368 :
369 78 : if (i >= EAP_MAX_METHODS ||
370 78 : sm->user->methods[i].vendor != EAP_VENDOR_IETF ||
371 39 : sm->user->methods[i].method != EAP_TYPE_PAX) {
372 0 : wpa_hexdump_ascii(MSG_DEBUG,
373 : "EAP-PAX: EAP-PAX not enabled for CID",
374 0 : (u8 *) data->cid, data->cid_len);
375 0 : data->state = FAILURE;
376 0 : return;
377 : }
378 :
379 78 : if (sm->user->password == NULL ||
380 39 : sm->user->password_len != EAP_PAX_AK_LEN) {
381 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: invalid password in "
382 : "user database for CID",
383 0 : (u8 *) data->cid, data->cid_len);
384 0 : data->state = FAILURE;
385 0 : return;
386 : }
387 39 : os_memcpy(data->ak, sm->user->password, EAP_PAX_AK_LEN);
388 :
389 39 : if (eap_pax_initial_key_derivation(data->mac_id, data->ak,
390 39 : data->rand.e, data->mk, data->ck,
391 39 : data->ick, data->mid) < 0) {
392 0 : wpa_printf(MSG_INFO, "EAP-PAX: Failed to complete initial "
393 : "key derivation");
394 0 : data->state = FAILURE;
395 0 : return;
396 : }
397 39 : data->keys_set = 1;
398 :
399 78 : eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN,
400 39 : data->rand.r.x, EAP_PAX_RAND_LEN,
401 39 : data->rand.r.y, EAP_PAX_RAND_LEN,
402 39 : (u8 *) data->cid, data->cid_len, mac);
403 39 : if (os_memcmp_const(mac, pos, EAP_PAX_MAC_LEN) != 0) {
404 1 : wpa_printf(MSG_INFO, "EAP-PAX: Invalid MAC_CK(A, B, CID) in "
405 : "PAX_STD-2");
406 1 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected MAC_CK(A, B, CID)",
407 : mac, EAP_PAX_MAC_LEN);
408 1 : data->state = FAILURE;
409 1 : return;
410 : }
411 :
412 38 : pos += EAP_PAX_MAC_LEN;
413 38 : left -= EAP_PAX_MAC_LEN;
414 :
415 38 : if (left < EAP_PAX_ICV_LEN) {
416 0 : wpa_printf(MSG_INFO, "EAP-PAX: Too short ICV (%lu) in "
417 : "PAX_STD-2", (unsigned long) left);
418 0 : return;
419 : }
420 38 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN);
421 76 : eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN,
422 38 : wpabuf_head(respData),
423 38 : wpabuf_len(respData) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0,
424 : icvbuf);
425 38 : if (os_memcmp_const(icvbuf, pos, EAP_PAX_ICV_LEN) != 0) {
426 0 : wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV in PAX_STD-2");
427 0 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV",
428 : icvbuf, EAP_PAX_ICV_LEN);
429 0 : return;
430 : }
431 38 : pos += EAP_PAX_ICV_LEN;
432 38 : left -= EAP_PAX_ICV_LEN;
433 :
434 38 : if (left > 0) {
435 0 : wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload",
436 : pos, left);
437 : }
438 :
439 38 : data->state = PAX_STD_3;
440 : }
441 :
442 :
443 38 : static void eap_pax_process_ack(struct eap_sm *sm,
444 : struct eap_pax_data *data,
445 : struct wpabuf *respData)
446 : {
447 38 : if (data->state != PAX_STD_3)
448 38 : return;
449 :
450 38 : wpa_printf(MSG_DEBUG, "EAP-PAX: Received PAX-ACK - authentication "
451 : "completed successfully");
452 38 : data->state = SUCCESS;
453 : }
454 :
455 :
456 77 : static void eap_pax_process(struct eap_sm *sm, void *priv,
457 : struct wpabuf *respData)
458 : {
459 77 : struct eap_pax_data *data = priv;
460 : struct eap_pax_hdr *resp;
461 : const u8 *pos;
462 : size_t len;
463 :
464 77 : if (sm->user == NULL || sm->user->password == NULL) {
465 0 : wpa_printf(MSG_INFO, "EAP-PAX: Plaintext password not "
466 : "configured");
467 0 : data->state = FAILURE;
468 0 : return;
469 : }
470 :
471 77 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len);
472 77 : if (pos == NULL || len < sizeof(*resp))
473 0 : return;
474 :
475 77 : resp = (struct eap_pax_hdr *) pos;
476 :
477 77 : switch (resp->op_code) {
478 : case EAP_PAX_OP_STD_2:
479 39 : eap_pax_process_std_2(sm, data, respData);
480 39 : break;
481 : case EAP_PAX_OP_ACK:
482 38 : eap_pax_process_ack(sm, data, respData);
483 38 : break;
484 : }
485 : }
486 :
487 :
488 78 : static Boolean eap_pax_isDone(struct eap_sm *sm, void *priv)
489 : {
490 78 : struct eap_pax_data *data = priv;
491 78 : return data->state == SUCCESS || data->state == FAILURE;
492 : }
493 :
494 :
495 39 : static u8 * eap_pax_getKey(struct eap_sm *sm, void *priv, size_t *len)
496 : {
497 39 : struct eap_pax_data *data = priv;
498 : u8 *key;
499 :
500 39 : if (data->state != SUCCESS)
501 1 : return NULL;
502 :
503 38 : key = os_malloc(EAP_MSK_LEN);
504 38 : if (key == NULL)
505 0 : return NULL;
506 :
507 38 : *len = EAP_MSK_LEN;
508 38 : eap_pax_kdf(data->mac_id, data->mk, EAP_PAX_MK_LEN,
509 38 : "Master Session Key", data->rand.e, 2 * EAP_PAX_RAND_LEN,
510 : EAP_MSK_LEN, key);
511 :
512 38 : return key;
513 : }
514 :
515 :
516 2 : static u8 * eap_pax_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
517 : {
518 2 : struct eap_pax_data *data = priv;
519 : u8 *key;
520 :
521 2 : if (data->state != SUCCESS)
522 0 : return NULL;
523 :
524 2 : key = os_malloc(EAP_EMSK_LEN);
525 2 : if (key == NULL)
526 0 : return NULL;
527 :
528 2 : *len = EAP_EMSK_LEN;
529 2 : eap_pax_kdf(data->mac_id, data->mk, EAP_PAX_MK_LEN,
530 : "Extended Master Session Key",
531 2 : data->rand.e, 2 * EAP_PAX_RAND_LEN,
532 : EAP_EMSK_LEN, key);
533 :
534 2 : return key;
535 : }
536 :
537 :
538 40 : static Boolean eap_pax_isSuccess(struct eap_sm *sm, void *priv)
539 : {
540 40 : struct eap_pax_data *data = priv;
541 40 : return data->state == SUCCESS;
542 : }
543 :
544 :
545 39 : static u8 * eap_pax_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
546 : {
547 39 : struct eap_pax_data *data = priv;
548 : u8 *sid;
549 :
550 39 : if (data->state != SUCCESS)
551 1 : return NULL;
552 :
553 38 : sid = os_malloc(1 + EAP_PAX_MID_LEN);
554 38 : if (sid == NULL)
555 0 : return NULL;
556 :
557 38 : *len = 1 + EAP_PAX_MID_LEN;
558 38 : sid[0] = EAP_TYPE_PAX;
559 38 : os_memcpy(sid + 1, data->mid, EAP_PAX_MID_LEN);
560 :
561 38 : return sid;
562 : }
563 :
564 :
565 25 : int eap_server_pax_register(void)
566 : {
567 : struct eap_method *eap;
568 : int ret;
569 :
570 25 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
571 : EAP_VENDOR_IETF, EAP_TYPE_PAX, "PAX");
572 25 : if (eap == NULL)
573 0 : return -1;
574 :
575 25 : eap->init = eap_pax_init;
576 25 : eap->reset = eap_pax_reset;
577 25 : eap->buildReq = eap_pax_buildReq;
578 25 : eap->check = eap_pax_check;
579 25 : eap->process = eap_pax_process;
580 25 : eap->isDone = eap_pax_isDone;
581 25 : eap->getKey = eap_pax_getKey;
582 25 : eap->isSuccess = eap_pax_isSuccess;
583 25 : eap->get_emsk = eap_pax_get_emsk;
584 25 : eap->getSessionId = eap_pax_get_session_id;
585 :
586 25 : ret = eap_server_method_register(eap);
587 25 : if (ret)
588 0 : eap_server_method_free(eap);
589 25 : return ret;
590 : }
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