2 * hostapd / EAP-GPSK (RFC 5433) server
3 * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
12 #include "crypto/random.h"
13 #include "eap_server/eap_i.h"
14 #include "eap_common/eap_gpsk_common.h"
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];
22 u8 emsk[EAP_EMSK_LEN];
23 u8 sk[EAP_GPSK_MAX_SK_LEN];
25 u8 pk[EAP_GPSK_MAX_PK_LEN];
31 #define MAX_NUM_CSUITES 2
32 struct eap_gpsk_csuite csuite_list[MAX_NUM_CSUITES];
34 int vendor; /* CSuite/Vendor */
35 int specifier; /* CSuite/Specifier */
39 static const char * eap_gpsk_state_txt(int state)
56 static void eap_gpsk_state(struct eap_gpsk_data *data, int state)
58 wpa_printf(MSG_DEBUG, "EAP-GPSK: %s -> %s",
59 eap_gpsk_state_txt(data->state),
60 eap_gpsk_state_txt(state));
65 static void * eap_gpsk_init(struct eap_sm *sm)
67 struct eap_gpsk_data *data;
69 data = os_zalloc(sizeof(*data));
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,
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);
96 static void eap_gpsk_reset(struct eap_sm *sm, void *priv)
98 struct eap_gpsk_data *data = priv;
99 os_free(data->id_peer);
100 bin_clear_free(data, sizeof(*data));
104 static struct wpabuf * eap_gpsk_build_gpsk_1(struct eap_sm *sm,
105 struct eap_gpsk_data *data, u8 id)
110 wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-1");
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);
117 wpa_hexdump(MSG_MSGDUMP, "EAP-GPSK: RAND_Server",
118 data->rand_server, EAP_GPSK_RAND_LEN);
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);
125 wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
126 "for request/GPSK-1");
127 eap_gpsk_state(data, FAILURE);
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);
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));
144 static struct wpabuf * eap_gpsk_build_gpsk_3(struct eap_sm *sm,
145 struct eap_gpsk_data *data, u8 id)
149 struct eap_gpsk_csuite *csuite;
152 wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-3");
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);
160 wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
161 "for request/GPSK-3");
162 eap_gpsk_state(data, FAILURE);
166 wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_3);
167 start = wpabuf_put(req, 0);
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);
177 /* no PD_Payload_2 */
178 wpabuf_put_be16(req, 0);
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)
185 eap_gpsk_state(data, FAILURE);
193 static struct wpabuf * eap_gpsk_buildReq(struct eap_sm *sm, void *priv, u8 id)
195 struct eap_gpsk_data *data = priv;
197 switch (data->state) {
199 return eap_gpsk_build_gpsk_1(sm, data, id);
201 return eap_gpsk_build_gpsk_3(sm, data, id);
203 wpa_printf(MSG_DEBUG, "EAP-GPSK: Unknown state %d in buildReq",
211 static Boolean eap_gpsk_check(struct eap_sm *sm, void *priv,
212 struct wpabuf *respData)
214 struct eap_gpsk_data *data = priv;
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");
224 wpa_printf(MSG_DEBUG, "EAP-GPSK: Received frame: opcode=%d", *pos);
226 if (data->state == GPSK_1 && *pos == EAP_GPSK_OPCODE_GPSK_2)
229 if (data->state == GPSK_3 && *pos == EAP_GPSK_OPCODE_GPSK_4)
232 wpa_printf(MSG_INFO, "EAP-GPSK: Unexpected opcode=%d in state=%d",
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)
245 const struct eap_gpsk_csuite *csuite;
247 u8 mic[EAP_GPSK_MAX_MIC_LEN];
249 if (data->state != GPSK_1)
252 wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-2");
255 end = payload + payloadlen;
258 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
260 eap_gpsk_state(data, FAILURE);
263 alen = WPA_GET_BE16(pos);
265 if (end - pos < alen) {
266 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
268 eap_gpsk_state(data, FAILURE);
271 os_free(data->id_peer);
272 data->id_peer = os_memdup(pos, 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);
278 data->id_peer_len = alen;
279 wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Peer",
280 data->id_peer, data->id_peer_len);
284 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
286 eap_gpsk_state(data, FAILURE);
289 alen = WPA_GET_BE16(pos);
291 if (end - pos < alen) {
292 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
294 eap_gpsk_state(data, FAILURE);
297 if (alen != sm->server_id_len ||
298 os_memcmp(pos, sm->server_id, alen) != 0) {
299 wpa_printf(MSG_DEBUG, "EAP-GPSK: ID_Server in GPSK-1 and "
300 "GPSK-2 did not match");
301 eap_gpsk_state(data, FAILURE);
306 if (end - pos < EAP_GPSK_RAND_LEN) {
307 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
309 eap_gpsk_state(data, FAILURE);
312 os_memcpy(data->rand_peer, pos, EAP_GPSK_RAND_LEN);
313 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Peer",
314 data->rand_peer, EAP_GPSK_RAND_LEN);
315 pos += EAP_GPSK_RAND_LEN;
317 if (end - pos < EAP_GPSK_RAND_LEN) {
318 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
320 eap_gpsk_state(data, FAILURE);
323 if (os_memcmp(data->rand_server, pos, EAP_GPSK_RAND_LEN) != 0) {
324 wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1 and "
325 "GPSK-2 did not match");
326 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1",
327 data->rand_server, EAP_GPSK_RAND_LEN);
328 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-2",
329 pos, EAP_GPSK_RAND_LEN);
330 eap_gpsk_state(data, FAILURE);
333 pos += EAP_GPSK_RAND_LEN;
336 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
337 "CSuite_List length");
338 eap_gpsk_state(data, FAILURE);
341 alen = WPA_GET_BE16(pos);
343 if (end - pos < alen) {
344 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
346 eap_gpsk_state(data, FAILURE);
349 if (alen != data->csuite_count * sizeof(struct eap_gpsk_csuite) ||
350 os_memcmp(pos, data->csuite_list, alen) != 0) {
351 wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_List in GPSK-1 and "
352 "GPSK-2 did not match");
353 eap_gpsk_state(data, FAILURE);
358 if (end - pos < (int) sizeof(*csuite)) {
359 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
361 eap_gpsk_state(data, FAILURE);
364 csuite = (const struct eap_gpsk_csuite *) pos;
365 for (i = 0; i < data->csuite_count; i++) {
366 if (os_memcmp(csuite, &data->csuite_list[i], sizeof(*csuite))
370 if (i == data->csuite_count) {
371 wpa_printf(MSG_DEBUG, "EAP-GPSK: Peer selected unsupported "
373 WPA_GET_BE32(csuite->vendor),
374 WPA_GET_BE16(csuite->specifier));
375 eap_gpsk_state(data, FAILURE);
378 data->vendor = WPA_GET_BE32(csuite->vendor);
379 data->specifier = WPA_GET_BE16(csuite->specifier);
380 wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_Sel %d:%d",
381 data->vendor, data->specifier);
382 pos += sizeof(*csuite);
385 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
386 "PD_Payload_1 length");
387 eap_gpsk_state(data, FAILURE);
390 alen = WPA_GET_BE16(pos);
392 if (end - pos < alen) {
393 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
395 eap_gpsk_state(data, FAILURE);
398 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
401 if (sm->user == NULL || sm->user->password == NULL) {
402 wpa_printf(MSG_INFO, "EAP-GPSK: No PSK/password configured "
404 eap_gpsk_state(data, FAILURE);
408 if (eap_gpsk_derive_keys(sm->user->password, sm->user->password_len,
409 data->vendor, data->specifier,
410 data->rand_peer, data->rand_server,
411 data->id_peer, data->id_peer_len,
412 sm->server_id, sm->server_id_len,
413 data->msk, data->emsk,
414 data->sk, &data->sk_len,
415 data->pk, &data->pk_len) < 0) {
416 wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to derive keys");
417 eap_gpsk_state(data, FAILURE);
421 if (eap_gpsk_derive_session_id(sm->user->password,
422 sm->user->password_len,
423 data->vendor, data->specifier,
424 data->rand_peer, data->rand_server,
425 data->id_peer, data->id_peer_len,
426 sm->server_id, sm->server_id_len,
428 data->session_id, &data->id_len) < 0) {
429 wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to derive Session-Id");
430 eap_gpsk_state(data, FAILURE);
433 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Derived Session-Id",
434 data->session_id, data->id_len);
436 miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
437 if (end - pos < (int) miclen) {
438 wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
439 "(left=%lu miclen=%lu)",
440 (unsigned long) (end - pos),
441 (unsigned long) miclen);
442 eap_gpsk_state(data, FAILURE);
445 if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
446 data->specifier, payload, pos - payload, mic)
448 wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
449 eap_gpsk_state(data, FAILURE);
452 if (os_memcmp_const(mic, pos, miclen) != 0) {
453 wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-2");
454 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
455 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
456 eap_gpsk_state(data, FAILURE);
462 wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
463 "data in the end of GPSK-2",
464 (unsigned long) (end - pos));
467 eap_gpsk_state(data, GPSK_3);
471 static void eap_gpsk_process_gpsk_4(struct eap_sm *sm,
472 struct eap_gpsk_data *data,
473 const u8 *payload, size_t payloadlen)
478 u8 mic[EAP_GPSK_MAX_MIC_LEN];
480 if (data->state != GPSK_3)
483 wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-4");
486 end = payload + payloadlen;
489 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
490 "PD_Payload_1 length");
491 eap_gpsk_state(data, FAILURE);
494 alen = WPA_GET_BE16(pos);
496 if (end - pos < alen) {
497 wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
499 eap_gpsk_state(data, FAILURE);
502 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
505 miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
506 if (end - pos < (int) miclen) {
507 wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
508 "(left=%lu miclen=%lu)",
509 (unsigned long) (end - pos),
510 (unsigned long) miclen);
511 eap_gpsk_state(data, FAILURE);
514 if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
515 data->specifier, payload, pos - payload, mic)
517 wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
518 eap_gpsk_state(data, FAILURE);
521 if (os_memcmp_const(mic, pos, miclen) != 0) {
522 wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-4");
523 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
524 wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
525 eap_gpsk_state(data, FAILURE);
531 wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
532 "data in the end of GPSK-4",
533 (unsigned long) (end - pos));
536 eap_gpsk_state(data, SUCCESS);
540 static void eap_gpsk_process(struct eap_sm *sm, void *priv,
541 struct wpabuf *respData)
543 struct eap_gpsk_data *data = priv;
547 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
548 if (pos == NULL || len < 1)
552 case EAP_GPSK_OPCODE_GPSK_2:
553 eap_gpsk_process_gpsk_2(sm, data, pos + 1, len - 1);
555 case EAP_GPSK_OPCODE_GPSK_4:
556 eap_gpsk_process_gpsk_4(sm, data, pos + 1, len - 1);
562 static Boolean eap_gpsk_isDone(struct eap_sm *sm, void *priv)
564 struct eap_gpsk_data *data = priv;
565 return data->state == SUCCESS || data->state == FAILURE;
569 static u8 * eap_gpsk_getKey(struct eap_sm *sm, void *priv, size_t *len)
571 struct eap_gpsk_data *data = priv;
574 if (data->state != SUCCESS)
577 key = os_memdup(data->msk, EAP_MSK_LEN);
586 static u8 * eap_gpsk_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
588 struct eap_gpsk_data *data = priv;
591 if (data->state != SUCCESS)
594 key = os_memdup(data->emsk, EAP_EMSK_LEN);
603 static Boolean eap_gpsk_isSuccess(struct eap_sm *sm, void *priv)
605 struct eap_gpsk_data *data = priv;
606 return data->state == SUCCESS;
610 static u8 * eap_gpsk_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
612 struct eap_gpsk_data *data = priv;
615 if (data->state != SUCCESS)
618 sid = os_memdup(data->session_id, data->id_len);
627 int eap_server_gpsk_register(void)
629 struct eap_method *eap;
631 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
632 EAP_VENDOR_IETF, EAP_TYPE_GPSK, "GPSK");
636 eap->init = eap_gpsk_init;
637 eap->reset = eap_gpsk_reset;
638 eap->buildReq = eap_gpsk_buildReq;
639 eap->check = eap_gpsk_check;
640 eap->process = eap_gpsk_process;
641 eap->isDone = eap_gpsk_isDone;
642 eap->getKey = eap_gpsk_getKey;
643 eap->isSuccess = eap_gpsk_isSuccess;
644 eap->get_emsk = eap_gpsk_get_emsk;
645 eap->getSessionId = eap_gpsk_get_session_id;
647 return eap_server_method_register(eap);