xref: /freebsd/contrib/wpa/src/eap_server/eap_server_gpsk.c (revision d3d381b2b194b4d24853e92eecef55f262688d1a)
1 /*
2  * hostapd / EAP-GPSK (RFC 5433) server
3  * Copyright (c) 2006-2007, 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_gpsk_common.h"
15 
16 
17 struct eap_gpsk_data {
18 	enum { GPSK_1, GPSK_3, SUCCESS, FAILURE } state;
19 	u8 rand_server[EAP_GPSK_RAND_LEN];
20 	u8 rand_peer[EAP_GPSK_RAND_LEN];
21 	u8 msk[EAP_MSK_LEN];
22 	u8 emsk[EAP_EMSK_LEN];
23 	u8 sk[EAP_GPSK_MAX_SK_LEN];
24 	size_t sk_len;
25 	u8 pk[EAP_GPSK_MAX_PK_LEN];
26 	size_t pk_len;
27 	u8 session_id[128];
28 	size_t id_len;
29 	u8 *id_peer;
30 	size_t id_peer_len;
31 #define MAX_NUM_CSUITES 2
32 	struct eap_gpsk_csuite csuite_list[MAX_NUM_CSUITES];
33 	size_t csuite_count;
34 	int vendor; /* CSuite/Vendor */
35 	int specifier; /* CSuite/Specifier */
36 };
37 
38 
39 static const char * eap_gpsk_state_txt(int state)
40 {
41 	switch (state) {
42 	case GPSK_1:
43 		return "GPSK-1";
44 	case GPSK_3:
45 		return "GPSK-3";
46 	case SUCCESS:
47 		return "SUCCESS";
48 	case FAILURE:
49 		return "FAILURE";
50 	default:
51 		return "?";
52 	}
53 }
54 
55 
56 static void eap_gpsk_state(struct eap_gpsk_data *data, int state)
57 {
58 	wpa_printf(MSG_DEBUG, "EAP-GPSK: %s -> %s",
59 		   eap_gpsk_state_txt(data->state),
60 		   eap_gpsk_state_txt(state));
61 	data->state = state;
62 }
63 
64 
65 static void * eap_gpsk_init(struct eap_sm *sm)
66 {
67 	struct eap_gpsk_data *data;
68 
69 	data = os_zalloc(sizeof(*data));
70 	if (data == NULL)
71 		return NULL;
72 	data->state = GPSK_1;
73 
74 	data->csuite_count = 0;
75 	if (eap_gpsk_supported_ciphersuite(EAP_GPSK_VENDOR_IETF,
76 					   EAP_GPSK_CIPHER_AES)) {
77 		WPA_PUT_BE32(data->csuite_list[data->csuite_count].vendor,
78 			     EAP_GPSK_VENDOR_IETF);
79 		WPA_PUT_BE16(data->csuite_list[data->csuite_count].specifier,
80 			     EAP_GPSK_CIPHER_AES);
81 		data->csuite_count++;
82 	}
83 	if (eap_gpsk_supported_ciphersuite(EAP_GPSK_VENDOR_IETF,
84 					   EAP_GPSK_CIPHER_SHA256)) {
85 		WPA_PUT_BE32(data->csuite_list[data->csuite_count].vendor,
86 			     EAP_GPSK_VENDOR_IETF);
87 		WPA_PUT_BE16(data->csuite_list[data->csuite_count].specifier,
88 			     EAP_GPSK_CIPHER_SHA256);
89 		data->csuite_count++;
90 	}
91 
92 	return data;
93 }
94 
95 
96 static void eap_gpsk_reset(struct eap_sm *sm, void *priv)
97 {
98 	struct eap_gpsk_data *data = priv;
99 	os_free(data->id_peer);
100 	bin_clear_free(data, sizeof(*data));
101 }
102 
103 
104 static struct wpabuf * eap_gpsk_build_gpsk_1(struct eap_sm *sm,
105 					     struct eap_gpsk_data *data, u8 id)
106 {
107 	size_t len;
108 	struct wpabuf *req;
109 
110 	wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-1");
111 
112 	if (random_get_bytes(data->rand_server, EAP_GPSK_RAND_LEN)) {
113 		wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to get random data");
114 		eap_gpsk_state(data, FAILURE);
115 		return NULL;
116 	}
117 	wpa_hexdump(MSG_MSGDUMP, "EAP-GPSK: RAND_Server",
118 		    data->rand_server, EAP_GPSK_RAND_LEN);
119 
120 	len = 1 + 2 + sm->server_id_len + EAP_GPSK_RAND_LEN + 2 +
121 		data->csuite_count * sizeof(struct eap_gpsk_csuite);
122 	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, len,
123 			    EAP_CODE_REQUEST, id);
124 	if (req == NULL) {
125 		wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
126 			   "for request/GPSK-1");
127 		eap_gpsk_state(data, FAILURE);
128 		return NULL;
129 	}
130 
131 	wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_1);
132 	wpabuf_put_be16(req, sm->server_id_len);
133 	wpabuf_put_data(req, sm->server_id, sm->server_id_len);
134 	wpabuf_put_data(req, data->rand_server, EAP_GPSK_RAND_LEN);
135 	wpabuf_put_be16(req,
136 			data->csuite_count * sizeof(struct eap_gpsk_csuite));
137 	wpabuf_put_data(req, data->csuite_list,
138 			data->csuite_count * sizeof(struct eap_gpsk_csuite));
139 
140 	return req;
141 }
142 
143 
144 static struct wpabuf * eap_gpsk_build_gpsk_3(struct eap_sm *sm,
145 					     struct eap_gpsk_data *data, u8 id)
146 {
147 	u8 *pos, *start;
148 	size_t len, miclen;
149 	struct eap_gpsk_csuite *csuite;
150 	struct wpabuf *req;
151 
152 	wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-3");
153 
154 	miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
155 	len = 1 + 2 * EAP_GPSK_RAND_LEN + 2 + sm->server_id_len +
156 		sizeof(struct eap_gpsk_csuite) + 2 + miclen;
157 	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, len,
158 			    EAP_CODE_REQUEST, id);
159 	if (req == NULL) {
160 		wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
161 			   "for request/GPSK-3");
162 		eap_gpsk_state(data, FAILURE);
163 		return NULL;
164 	}
165 
166 	wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_3);
167 	start = wpabuf_put(req, 0);
168 
169 	wpabuf_put_data(req, data->rand_peer, EAP_GPSK_RAND_LEN);
170 	wpabuf_put_data(req, data->rand_server, EAP_GPSK_RAND_LEN);
171 	wpabuf_put_be16(req, sm->server_id_len);
172 	wpabuf_put_data(req, sm->server_id, sm->server_id_len);
173 	csuite = wpabuf_put(req, sizeof(*csuite));
174 	WPA_PUT_BE32(csuite->vendor, data->vendor);
175 	WPA_PUT_BE16(csuite->specifier, data->specifier);
176 
177 	/* no PD_Payload_2 */
178 	wpabuf_put_be16(req, 0);
179 
180 	pos = wpabuf_put(req, miclen);
181 	if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
182 				 data->specifier, start, pos - start, pos) < 0)
183 	{
184 		os_free(req);
185 		eap_gpsk_state(data, FAILURE);
186 		return NULL;
187 	}
188 
189 	return req;
190 }
191 
192 
193 static struct wpabuf * eap_gpsk_buildReq(struct eap_sm *sm, void *priv, u8 id)
194 {
195 	struct eap_gpsk_data *data = priv;
196 
197 	switch (data->state) {
198 	case GPSK_1:
199 		return eap_gpsk_build_gpsk_1(sm, data, id);
200 	case GPSK_3:
201 		return eap_gpsk_build_gpsk_3(sm, data, id);
202 	default:
203 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Unknown state %d in buildReq",
204 			   data->state);
205 		break;
206 	}
207 	return NULL;
208 }
209 
210 
211 static Boolean eap_gpsk_check(struct eap_sm *sm, void *priv,
212 			      struct wpabuf *respData)
213 {
214 	struct eap_gpsk_data *data = priv;
215 	const u8 *pos;
216 	size_t len;
217 
218 	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
219 	if (pos == NULL || len < 1) {
220 		wpa_printf(MSG_INFO, "EAP-GPSK: Invalid frame");
221 		return TRUE;
222 	}
223 
224 	wpa_printf(MSG_DEBUG, "EAP-GPSK: Received frame: opcode=%d", *pos);
225 
226 	if (data->state == GPSK_1 && *pos == EAP_GPSK_OPCODE_GPSK_2)
227 		return FALSE;
228 
229 	if (data->state == GPSK_3 && *pos == EAP_GPSK_OPCODE_GPSK_4)
230 		return FALSE;
231 
232 	wpa_printf(MSG_INFO, "EAP-GPSK: Unexpected opcode=%d in state=%d",
233 		   *pos, data->state);
234 
235 	return TRUE;
236 }
237 
238 
239 static void eap_gpsk_process_gpsk_2(struct eap_sm *sm,
240 				    struct eap_gpsk_data *data,
241 				    const u8 *payload, size_t payloadlen)
242 {
243 	const u8 *pos, *end;
244 	u16 alen;
245 	const struct eap_gpsk_csuite *csuite;
246 	size_t i, miclen;
247 	u8 mic[EAP_GPSK_MAX_MIC_LEN];
248 
249 	if (data->state != GPSK_1)
250 		return;
251 
252 	wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-2");
253 
254 	pos = payload;
255 	end = payload + payloadlen;
256 
257 	if (end - pos < 2) {
258 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
259 			   "ID_Peer length");
260 		eap_gpsk_state(data, FAILURE);
261 		return;
262 	}
263 	alen = WPA_GET_BE16(pos);
264 	pos += 2;
265 	if (end - pos < alen) {
266 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
267 			   "ID_Peer");
268 		eap_gpsk_state(data, FAILURE);
269 		return;
270 	}
271 	os_free(data->id_peer);
272 	data->id_peer = os_malloc(alen);
273 	if (data->id_peer == NULL) {
274 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Not enough memory to store "
275 			   "%d-octet ID_Peer", alen);
276 		return;
277 	}
278 	os_memcpy(data->id_peer, pos, alen);
279 	data->id_peer_len = alen;
280 	wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Peer",
281 			  data->id_peer, data->id_peer_len);
282 	pos += alen;
283 
284 	if (end - pos < 2) {
285 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
286 			   "ID_Server length");
287 		eap_gpsk_state(data, FAILURE);
288 		return;
289 	}
290 	alen = WPA_GET_BE16(pos);
291 	pos += 2;
292 	if (end - pos < alen) {
293 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
294 			   "ID_Server");
295 		eap_gpsk_state(data, FAILURE);
296 		return;
297 	}
298 	if (alen != sm->server_id_len ||
299 	    os_memcmp(pos, sm->server_id, alen) != 0) {
300 		wpa_printf(MSG_DEBUG, "EAP-GPSK: ID_Server in GPSK-1 and "
301 			   "GPSK-2 did not match");
302 		eap_gpsk_state(data, FAILURE);
303 		return;
304 	}
305 	pos += alen;
306 
307 	if (end - pos < EAP_GPSK_RAND_LEN) {
308 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
309 			   "RAND_Peer");
310 		eap_gpsk_state(data, FAILURE);
311 		return;
312 	}
313 	os_memcpy(data->rand_peer, pos, EAP_GPSK_RAND_LEN);
314 	wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Peer",
315 		    data->rand_peer, EAP_GPSK_RAND_LEN);
316 	pos += EAP_GPSK_RAND_LEN;
317 
318 	if (end - pos < EAP_GPSK_RAND_LEN) {
319 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
320 			   "RAND_Server");
321 		eap_gpsk_state(data, FAILURE);
322 		return;
323 	}
324 	if (os_memcmp(data->rand_server, pos, EAP_GPSK_RAND_LEN) != 0) {
325 		wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1 and "
326 			   "GPSK-2 did not match");
327 		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1",
328 			    data->rand_server, EAP_GPSK_RAND_LEN);
329 		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-2",
330 			    pos, EAP_GPSK_RAND_LEN);
331 		eap_gpsk_state(data, FAILURE);
332 		return;
333 	}
334 	pos += EAP_GPSK_RAND_LEN;
335 
336 	if (end - pos < 2) {
337 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
338 			   "CSuite_List length");
339 		eap_gpsk_state(data, FAILURE);
340 		return;
341 	}
342 	alen = WPA_GET_BE16(pos);
343 	pos += 2;
344 	if (end - pos < alen) {
345 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
346 			   "CSuite_List");
347 		eap_gpsk_state(data, FAILURE);
348 		return;
349 	}
350 	if (alen != data->csuite_count * sizeof(struct eap_gpsk_csuite) ||
351 	    os_memcmp(pos, data->csuite_list, alen) != 0) {
352 		wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_List in GPSK-1 and "
353 			   "GPSK-2 did not match");
354 		eap_gpsk_state(data, FAILURE);
355 		return;
356 	}
357 	pos += alen;
358 
359 	if (end - pos < (int) sizeof(*csuite)) {
360 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
361 			   "CSuite_Sel");
362 		eap_gpsk_state(data, FAILURE);
363 		return;
364 	}
365 	csuite = (const struct eap_gpsk_csuite *) pos;
366 	for (i = 0; i < data->csuite_count; i++) {
367 		if (os_memcmp(csuite, &data->csuite_list[i], sizeof(*csuite))
368 		    == 0)
369 			break;
370 	}
371 	if (i == data->csuite_count) {
372 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Peer selected unsupported "
373 			   "ciphersuite %d:%d",
374 			   WPA_GET_BE32(csuite->vendor),
375 			   WPA_GET_BE16(csuite->specifier));
376 		eap_gpsk_state(data, FAILURE);
377 		return;
378 	}
379 	data->vendor = WPA_GET_BE32(csuite->vendor);
380 	data->specifier = WPA_GET_BE16(csuite->specifier);
381 	wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_Sel %d:%d",
382 		   data->vendor, data->specifier);
383 	pos += sizeof(*csuite);
384 
385 	if (end - pos < 2) {
386 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
387 			   "PD_Payload_1 length");
388 		eap_gpsk_state(data, FAILURE);
389 		return;
390 	}
391 	alen = WPA_GET_BE16(pos);
392 	pos += 2;
393 	if (end - pos < alen) {
394 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
395 			   "PD_Payload_1");
396 		eap_gpsk_state(data, FAILURE);
397 		return;
398 	}
399 	wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
400 	pos += alen;
401 
402 	if (sm->user == NULL || sm->user->password == NULL) {
403 		wpa_printf(MSG_INFO, "EAP-GPSK: No PSK/password configured "
404 			   "for the user");
405 		eap_gpsk_state(data, FAILURE);
406 		return;
407 	}
408 
409 	if (eap_gpsk_derive_keys(sm->user->password, sm->user->password_len,
410 				 data->vendor, data->specifier,
411 				 data->rand_peer, data->rand_server,
412 				 data->id_peer, data->id_peer_len,
413 				 sm->server_id, sm->server_id_len,
414 				 data->msk, data->emsk,
415 				 data->sk, &data->sk_len,
416 				 data->pk, &data->pk_len) < 0) {
417 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to derive keys");
418 		eap_gpsk_state(data, FAILURE);
419 		return;
420 	}
421 
422 	if (eap_gpsk_derive_session_id(sm->user->password,
423 				       sm->user->password_len,
424 				       data->vendor, data->specifier,
425 				       data->rand_peer, data->rand_server,
426 				       data->id_peer, data->id_peer_len,
427 				       sm->server_id, sm->server_id_len,
428 				       EAP_TYPE_GPSK,
429 				       data->session_id, &data->id_len) < 0) {
430 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to derive Session-Id");
431 		eap_gpsk_state(data, FAILURE);
432 		return;
433 	}
434 	wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Derived Session-Id",
435 		    data->session_id, data->id_len);
436 
437 	miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
438 	if (end - pos < (int) miclen) {
439 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
440 			   "(left=%lu miclen=%lu)",
441 			   (unsigned long) (end - pos),
442 			   (unsigned long) miclen);
443 		eap_gpsk_state(data, FAILURE);
444 		return;
445 	}
446 	if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
447 				 data->specifier, payload, pos - payload, mic)
448 	    < 0) {
449 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
450 		eap_gpsk_state(data, FAILURE);
451 		return;
452 	}
453 	if (os_memcmp_const(mic, pos, miclen) != 0) {
454 		wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-2");
455 		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
456 		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
457 		eap_gpsk_state(data, FAILURE);
458 		return;
459 	}
460 	pos += miclen;
461 
462 	if (pos != end) {
463 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
464 			   "data in the end of GPSK-2",
465 			   (unsigned long) (end - pos));
466 	}
467 
468 	eap_gpsk_state(data, GPSK_3);
469 }
470 
471 
472 static void eap_gpsk_process_gpsk_4(struct eap_sm *sm,
473 				    struct eap_gpsk_data *data,
474 				    const u8 *payload, size_t payloadlen)
475 {
476 	const u8 *pos, *end;
477 	u16 alen;
478 	size_t miclen;
479 	u8 mic[EAP_GPSK_MAX_MIC_LEN];
480 
481 	if (data->state != GPSK_3)
482 		return;
483 
484 	wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-4");
485 
486 	pos = payload;
487 	end = payload + payloadlen;
488 
489 	if (end - pos < 2) {
490 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
491 			   "PD_Payload_1 length");
492 		eap_gpsk_state(data, FAILURE);
493 		return;
494 	}
495 	alen = WPA_GET_BE16(pos);
496 	pos += 2;
497 	if (end - pos < alen) {
498 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
499 			   "PD_Payload_1");
500 		eap_gpsk_state(data, FAILURE);
501 		return;
502 	}
503 	wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
504 	pos += alen;
505 
506 	miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
507 	if (end - pos < (int) miclen) {
508 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
509 			   "(left=%lu miclen=%lu)",
510 			   (unsigned long) (end - pos),
511 			   (unsigned long) miclen);
512 		eap_gpsk_state(data, FAILURE);
513 		return;
514 	}
515 	if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
516 				 data->specifier, payload, pos - payload, mic)
517 	    < 0) {
518 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
519 		eap_gpsk_state(data, FAILURE);
520 		return;
521 	}
522 	if (os_memcmp_const(mic, pos, miclen) != 0) {
523 		wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-4");
524 		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
525 		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
526 		eap_gpsk_state(data, FAILURE);
527 		return;
528 	}
529 	pos += miclen;
530 
531 	if (pos != end) {
532 		wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
533 			   "data in the end of GPSK-4",
534 			   (unsigned long) (end - pos));
535 	}
536 
537 	eap_gpsk_state(data, SUCCESS);
538 }
539 
540 
541 static void eap_gpsk_process(struct eap_sm *sm, void *priv,
542 			     struct wpabuf *respData)
543 {
544 	struct eap_gpsk_data *data = priv;
545 	const u8 *pos;
546 	size_t len;
547 
548 	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
549 	if (pos == NULL || len < 1)
550 		return;
551 
552 	switch (*pos) {
553 	case EAP_GPSK_OPCODE_GPSK_2:
554 		eap_gpsk_process_gpsk_2(sm, data, pos + 1, len - 1);
555 		break;
556 	case EAP_GPSK_OPCODE_GPSK_4:
557 		eap_gpsk_process_gpsk_4(sm, data, pos + 1, len - 1);
558 		break;
559 	}
560 }
561 
562 
563 static Boolean eap_gpsk_isDone(struct eap_sm *sm, void *priv)
564 {
565 	struct eap_gpsk_data *data = priv;
566 	return data->state == SUCCESS || data->state == FAILURE;
567 }
568 
569 
570 static u8 * eap_gpsk_getKey(struct eap_sm *sm, void *priv, size_t *len)
571 {
572 	struct eap_gpsk_data *data = priv;
573 	u8 *key;
574 
575 	if (data->state != SUCCESS)
576 		return NULL;
577 
578 	key = os_malloc(EAP_MSK_LEN);
579 	if (key == NULL)
580 		return NULL;
581 	os_memcpy(key, data->msk, EAP_MSK_LEN);
582 	*len = EAP_MSK_LEN;
583 
584 	return key;
585 }
586 
587 
588 static u8 * eap_gpsk_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
589 {
590 	struct eap_gpsk_data *data = priv;
591 	u8 *key;
592 
593 	if (data->state != SUCCESS)
594 		return NULL;
595 
596 	key = os_malloc(EAP_EMSK_LEN);
597 	if (key == NULL)
598 		return NULL;
599 	os_memcpy(key, data->emsk, EAP_EMSK_LEN);
600 	*len = EAP_EMSK_LEN;
601 
602 	return key;
603 }
604 
605 
606 static Boolean eap_gpsk_isSuccess(struct eap_sm *sm, void *priv)
607 {
608 	struct eap_gpsk_data *data = priv;
609 	return data->state == SUCCESS;
610 }
611 
612 
613 static u8 * eap_gpsk_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
614 {
615 	struct eap_gpsk_data *data = priv;
616 	u8 *sid;
617 
618 	if (data->state != SUCCESS)
619 		return NULL;
620 
621 	sid = os_malloc(data->id_len);
622 	if (sid == NULL)
623 		return NULL;
624 	os_memcpy(sid, data->session_id, data->id_len);
625 	*len = data->id_len;
626 
627 	return sid;
628 }
629 
630 
631 int eap_server_gpsk_register(void)
632 {
633 	struct eap_method *eap;
634 
635 	eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
636 				      EAP_VENDOR_IETF, EAP_TYPE_GPSK, "GPSK");
637 	if (eap == NULL)
638 		return -1;
639 
640 	eap->init = eap_gpsk_init;
641 	eap->reset = eap_gpsk_reset;
642 	eap->buildReq = eap_gpsk_buildReq;
643 	eap->check = eap_gpsk_check;
644 	eap->process = eap_gpsk_process;
645 	eap->isDone = eap_gpsk_isDone;
646 	eap->getKey = eap_gpsk_getKey;
647 	eap->isSuccess = eap_gpsk_isSuccess;
648 	eap->get_emsk = eap_gpsk_get_emsk;
649 	eap->getSessionId = eap_gpsk_get_session_id;
650 
651 	return eap_server_method_register(eap);
652 }
653