1 /*
2 * EAP-WSC peer for Wi-Fi Protected Setup
3 * Copyright (c) 2007-2009, 2012, 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 "uuid.h"
13 #include "eap_i.h"
14 #include "eap_common/eap_wsc_common.h"
15 #include "wps/wps.h"
16 #include "wps/wps_defs.h"
17
18
19 struct eap_wsc_data {
20 enum { WAIT_START, MESG, WAIT_FRAG_ACK, FAIL } state;
21 int registrar;
22 struct wpabuf *in_buf;
23 struct wpabuf *out_buf;
24 enum wsc_op_code in_op_code, out_op_code;
25 size_t out_used;
26 size_t fragment_size;
27 struct wps_data *wps;
28 struct wps_context *wps_ctx;
29 };
30
31
eap_wsc_state_txt(int state)32 static const char * eap_wsc_state_txt(int state)
33 {
34 switch (state) {
35 case WAIT_START:
36 return "WAIT_START";
37 case MESG:
38 return "MESG";
39 case WAIT_FRAG_ACK:
40 return "WAIT_FRAG_ACK";
41 case FAIL:
42 return "FAIL";
43 default:
44 return "?";
45 }
46 }
47
48
eap_wsc_state(struct eap_wsc_data * data,int state)49 static void eap_wsc_state(struct eap_wsc_data *data, int state)
50 {
51 wpa_printf(MSG_DEBUG, "EAP-WSC: %s -> %s",
52 eap_wsc_state_txt(data->state),
53 eap_wsc_state_txt(state));
54 data->state = state;
55 }
56
57
eap_wsc_new_ap_settings(struct wps_credential * cred,const char * params)58 static int eap_wsc_new_ap_settings(struct wps_credential *cred,
59 const char *params)
60 {
61 const char *pos, *end;
62 size_t len;
63
64 os_memset(cred, 0, sizeof(*cred));
65
66 pos = os_strstr(params, "new_ssid=");
67 if (pos == NULL)
68 return 0;
69 pos += 9;
70 end = os_strchr(pos, ' ');
71 if (end == NULL)
72 len = os_strlen(pos);
73 else
74 len = end - pos;
75 if ((len & 1) || len > 2 * sizeof(cred->ssid) ||
76 hexstr2bin(pos, cred->ssid, len / 2)) {
77 wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid new_ssid");
78 return -1;
79 }
80 cred->ssid_len = len / 2;
81
82 pos = os_strstr(params, "new_auth=");
83 if (pos == NULL) {
84 wpa_printf(MSG_DEBUG, "EAP-WSC: Missing new_auth");
85 return -1;
86 }
87 if (os_strncmp(pos + 9, "OPEN", 4) == 0)
88 cred->auth_type = WPS_AUTH_OPEN;
89 else if (os_strncmp(pos + 9, "WPAPSK", 6) == 0)
90 cred->auth_type = WPS_AUTH_WPAPSK;
91 else if (os_strncmp(pos + 9, "WPA2PSK", 7) == 0)
92 cred->auth_type = WPS_AUTH_WPA2PSK;
93 else {
94 wpa_printf(MSG_DEBUG, "EAP-WSC: Unknown new_auth");
95 return -1;
96 }
97
98 pos = os_strstr(params, "new_encr=");
99 if (pos == NULL) {
100 wpa_printf(MSG_DEBUG, "EAP-WSC: Missing new_encr");
101 return -1;
102 }
103 if (os_strncmp(pos + 9, "NONE", 4) == 0)
104 cred->encr_type = WPS_ENCR_NONE;
105 #ifdef CONFIG_TESTING_OPTIONS
106 else if (os_strncmp(pos + 9, "WEP", 3) == 0)
107 cred->encr_type = WPS_ENCR_WEP;
108 #endif /* CONFIG_TESTING_OPTIONS */
109 else if (os_strncmp(pos + 9, "TKIP", 4) == 0)
110 cred->encr_type = WPS_ENCR_TKIP;
111 else if (os_strncmp(pos + 9, "CCMP", 4) == 0)
112 cred->encr_type = WPS_ENCR_AES;
113 else {
114 wpa_printf(MSG_DEBUG, "EAP-WSC: Unknown new_encr");
115 return -1;
116 }
117
118 pos = os_strstr(params, "new_key=");
119 if (pos == NULL)
120 return 0;
121 pos += 8;
122 end = os_strchr(pos, ' ');
123 if (end == NULL)
124 len = os_strlen(pos);
125 else
126 len = end - pos;
127 if ((len & 1) || len > 2 * sizeof(cred->key) ||
128 hexstr2bin(pos, cred->key, len / 2)) {
129 wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid new_key");
130 return -1;
131 }
132 cred->key_len = len / 2;
133
134 return 1;
135 }
136
137
eap_wsc_init(struct eap_sm * sm)138 static void * eap_wsc_init(struct eap_sm *sm)
139 {
140 struct eap_wsc_data *data;
141 const u8 *identity;
142 size_t identity_len;
143 int registrar;
144 struct wps_config cfg;
145 const char *pos, *end;
146 const char *phase1;
147 struct wps_context *wps;
148 struct wps_credential new_ap_settings;
149 int res;
150 int nfc = 0;
151 u8 pkhash[WPS_OOB_PUBKEY_HASH_LEN];
152
153 wps = sm->wps;
154 if (wps == NULL) {
155 wpa_printf(MSG_ERROR, "EAP-WSC: WPS context not available");
156 return NULL;
157 }
158
159 identity = eap_get_config_identity(sm, &identity_len);
160
161 if (identity && identity_len == WSC_ID_REGISTRAR_LEN &&
162 os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0)
163 registrar = 1; /* Supplicant is Registrar */
164 else if (identity && identity_len == WSC_ID_ENROLLEE_LEN &&
165 os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0)
166 registrar = 0; /* Supplicant is Enrollee */
167 else {
168 wpa_hexdump_ascii(MSG_INFO, "EAP-WSC: Unexpected identity",
169 identity, identity_len);
170 return NULL;
171 }
172
173 data = os_zalloc(sizeof(*data));
174 if (data == NULL)
175 return NULL;
176 data->state = registrar ? MESG : WAIT_START;
177 data->registrar = registrar;
178 data->wps_ctx = wps;
179
180 os_memset(&cfg, 0, sizeof(cfg));
181 cfg.wps = wps;
182 cfg.registrar = registrar;
183
184 phase1 = eap_get_config_phase1(sm);
185 if (phase1 == NULL) {
186 wpa_printf(MSG_INFO, "EAP-WSC: phase1 configuration data not "
187 "set");
188 os_free(data);
189 return NULL;
190 }
191
192 pos = os_strstr(phase1, "pin=");
193 if (pos) {
194 pos += 4;
195 cfg.pin = (const u8 *) pos;
196 while (*pos != '\0' && *pos != ' ')
197 pos++;
198 cfg.pin_len = pos - (const char *) cfg.pin;
199 if (cfg.pin_len == 6 &&
200 os_strncmp((const char *) cfg.pin, "nfc-pw", 6) == 0) {
201 cfg.pin = NULL;
202 cfg.pin_len = 0;
203 nfc = 1;
204 }
205 } else {
206 pos = os_strstr(phase1, "pbc=1");
207 if (pos)
208 cfg.pbc = 1;
209 }
210
211 pos = os_strstr(phase1, "dev_pw_id=");
212 if (pos) {
213 u16 id = atoi(pos + 10);
214 if (id == DEV_PW_NFC_CONNECTION_HANDOVER)
215 nfc = 1;
216 if (cfg.pin || id == DEV_PW_NFC_CONNECTION_HANDOVER)
217 cfg.dev_pw_id = id;
218 }
219
220 if (cfg.pin == NULL && !cfg.pbc && !nfc) {
221 wpa_printf(MSG_INFO, "EAP-WSC: PIN or PBC not set in phase1 "
222 "configuration data");
223 os_free(data);
224 return NULL;
225 }
226
227 pos = os_strstr(phase1, " pkhash=");
228 if (pos) {
229 size_t len;
230 pos += 8;
231 end = os_strchr(pos, ' ');
232 if (end)
233 len = end - pos;
234 else
235 len = os_strlen(pos);
236 if (len != 2 * WPS_OOB_PUBKEY_HASH_LEN ||
237 hexstr2bin(pos, pkhash, WPS_OOB_PUBKEY_HASH_LEN)) {
238 wpa_printf(MSG_INFO, "EAP-WSC: Invalid pkhash");
239 os_free(data);
240 return NULL;
241 }
242 cfg.peer_pubkey_hash = pkhash;
243 }
244
245 res = eap_wsc_new_ap_settings(&new_ap_settings, phase1);
246 if (res < 0) {
247 os_free(data);
248 wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to parse new AP "
249 "settings");
250 return NULL;
251 }
252 if (res == 1) {
253 wpa_printf(MSG_DEBUG, "EAP-WSC: Provide new AP settings for "
254 "WPS");
255 cfg.new_ap_settings = &new_ap_settings;
256 }
257
258 pos = os_strstr(phase1, "multi_ap=");
259 if (pos) {
260 u16 id = atoi(pos + 9);
261
262 if (id != 0) {
263 cfg.multi_ap_backhaul_sta = 1;
264 cfg.multi_ap_profile = id;
265 } else {
266 wpa_printf(MSG_DEBUG,
267 "EAP-WSC: Invalid multi_ap setting");
268 }
269 }
270
271 data->wps = wps_init(&cfg);
272 if (data->wps == NULL) {
273 os_free(data);
274 wpa_printf(MSG_DEBUG, "EAP-WSC: wps_init failed");
275 return NULL;
276 }
277 res = eap_get_config_fragment_size(sm);
278 if (res > 0)
279 data->fragment_size = res;
280 else
281 data->fragment_size = WSC_FRAGMENT_SIZE;
282 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment size limit %u",
283 (unsigned int) data->fragment_size);
284
285 if (registrar && cfg.pin) {
286 wps_registrar_add_pin(data->wps_ctx->registrar, NULL, NULL,
287 cfg.pin, cfg.pin_len, 0);
288 }
289
290 /* Use reduced client timeout for WPS to avoid long wait */
291 if (sm->ClientTimeout > 30)
292 sm->ClientTimeout = 30;
293
294 return data;
295 }
296
297
eap_wsc_deinit(struct eap_sm * sm,void * priv)298 static void eap_wsc_deinit(struct eap_sm *sm, void *priv)
299 {
300 struct eap_wsc_data *data = priv;
301 wpabuf_free(data->in_buf);
302 wpabuf_free(data->out_buf);
303 wps_deinit(data->wps);
304 os_free(data->wps_ctx->network_key);
305 data->wps_ctx->network_key = NULL;
306 os_free(data);
307 }
308
309
eap_wsc_build_msg(struct eap_wsc_data * data,struct eap_method_ret * ret,u8 id)310 static struct wpabuf * eap_wsc_build_msg(struct eap_wsc_data *data,
311 struct eap_method_ret *ret, u8 id)
312 {
313 struct wpabuf *resp;
314 u8 flags;
315 size_t send_len, plen;
316
317 ret->ignore = false;
318 wpa_printf(MSG_DEBUG, "EAP-WSC: Generating Response");
319 ret->allowNotifications = true;
320
321 flags = 0;
322 send_len = wpabuf_len(data->out_buf) - data->out_used;
323 if (2 + send_len > data->fragment_size) {
324 send_len = data->fragment_size - 2;
325 flags |= WSC_FLAGS_MF;
326 if (data->out_used == 0) {
327 flags |= WSC_FLAGS_LF;
328 send_len -= 2;
329 }
330 }
331 plen = 2 + send_len;
332 if (flags & WSC_FLAGS_LF)
333 plen += 2;
334 resp = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, plen,
335 EAP_CODE_RESPONSE, id);
336 if (resp == NULL)
337 return NULL;
338
339 wpabuf_put_u8(resp, data->out_op_code); /* Op-Code */
340 wpabuf_put_u8(resp, flags); /* Flags */
341 if (flags & WSC_FLAGS_LF)
342 wpabuf_put_be16(resp, wpabuf_len(data->out_buf));
343
344 wpabuf_put_data(resp, wpabuf_head_u8(data->out_buf) + data->out_used,
345 send_len);
346 data->out_used += send_len;
347
348 ret->methodState = METHOD_MAY_CONT;
349 ret->decision = DECISION_FAIL;
350
351 if (data->out_used == wpabuf_len(data->out_buf)) {
352 wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
353 "(message sent completely)",
354 (unsigned long) send_len);
355 wpabuf_free(data->out_buf);
356 data->out_buf = NULL;
357 data->out_used = 0;
358 if ((data->state == FAIL && data->out_op_code == WSC_ACK) ||
359 data->out_op_code == WSC_NACK ||
360 data->out_op_code == WSC_Done) {
361 eap_wsc_state(data, FAIL);
362 ret->methodState = METHOD_DONE;
363 } else
364 eap_wsc_state(data, MESG);
365 } else {
366 wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
367 "(%lu more to send)", (unsigned long) send_len,
368 (unsigned long) wpabuf_len(data->out_buf) -
369 data->out_used);
370 eap_wsc_state(data, WAIT_FRAG_ACK);
371 }
372
373 return resp;
374 }
375
376
eap_wsc_process_cont(struct eap_wsc_data * data,const u8 * buf,size_t len,u8 op_code)377 static int eap_wsc_process_cont(struct eap_wsc_data *data,
378 const u8 *buf, size_t len, u8 op_code)
379 {
380 /* Process continuation of a pending message */
381 if (op_code != data->in_op_code) {
382 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d in "
383 "fragment (expected %d)",
384 op_code, data->in_op_code);
385 return -1;
386 }
387
388 if (len > wpabuf_tailroom(data->in_buf)) {
389 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment overflow");
390 eap_wsc_state(data, FAIL);
391 return -1;
392 }
393
394 wpabuf_put_data(data->in_buf, buf, len);
395 wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes, waiting "
396 "for %lu bytes more", (unsigned long) len,
397 (unsigned long) wpabuf_tailroom(data->in_buf));
398
399 return 0;
400 }
401
402
eap_wsc_process_fragment(struct eap_wsc_data * data,struct eap_method_ret * ret,u8 id,u8 flags,u8 op_code,u16 message_length,const u8 * buf,size_t len)403 static struct wpabuf * eap_wsc_process_fragment(struct eap_wsc_data *data,
404 struct eap_method_ret *ret,
405 u8 id, u8 flags, u8 op_code,
406 u16 message_length,
407 const u8 *buf, size_t len)
408 {
409 /* Process a fragment that is not the last one of the message */
410 if (data->in_buf == NULL && !(flags & WSC_FLAGS_LF)) {
411 wpa_printf(MSG_DEBUG, "EAP-WSC: No Message Length field in a "
412 "fragmented packet");
413 ret->ignore = true;
414 return NULL;
415 }
416
417 if (data->in_buf == NULL) {
418 /* First fragment of the message */
419 data->in_buf = wpabuf_alloc(message_length);
420 if (data->in_buf == NULL) {
421 wpa_printf(MSG_DEBUG, "EAP-WSC: No memory for "
422 "message");
423 ret->ignore = true;
424 return NULL;
425 }
426 data->in_op_code = op_code;
427 wpabuf_put_data(data->in_buf, buf, len);
428 wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes in first "
429 "fragment, waiting for %lu bytes more",
430 (unsigned long) len,
431 (unsigned long) wpabuf_tailroom(data->in_buf));
432 }
433
434 return eap_wsc_build_frag_ack(id, EAP_CODE_RESPONSE);
435 }
436
437
eap_wsc_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)438 static struct wpabuf * eap_wsc_process(struct eap_sm *sm, void *priv,
439 struct eap_method_ret *ret,
440 const struct wpabuf *reqData)
441 {
442 struct eap_wsc_data *data = priv;
443 const u8 *start, *pos, *end;
444 size_t len;
445 u8 op_code, flags, id;
446 u16 message_length = 0;
447 enum wps_process_res res;
448 struct wpabuf tmpbuf;
449 struct wpabuf *r;
450
451 pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, reqData,
452 &len);
453 if (pos == NULL || len < 2) {
454 ret->ignore = true;
455 return NULL;
456 }
457
458 id = eap_get_id(reqData);
459
460 start = pos;
461 end = start + len;
462
463 op_code = *pos++;
464 flags = *pos++;
465 if (flags & WSC_FLAGS_LF) {
466 if (end - pos < 2) {
467 wpa_printf(MSG_DEBUG, "EAP-WSC: Message underflow");
468 ret->ignore = true;
469 return NULL;
470 }
471 message_length = WPA_GET_BE16(pos);
472 pos += 2;
473
474 if (message_length < end - pos || message_length > 50000) {
475 wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid Message "
476 "Length");
477 ret->ignore = true;
478 return NULL;
479 }
480 }
481
482 wpa_printf(MSG_DEBUG, "EAP-WSC: Received packet: Op-Code %d "
483 "Flags 0x%x Message Length %d",
484 op_code, flags, message_length);
485
486 if (data->state == WAIT_FRAG_ACK) {
487 if (op_code != WSC_FRAG_ACK) {
488 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
489 "in WAIT_FRAG_ACK state", op_code);
490 ret->ignore = true;
491 return NULL;
492 }
493 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment acknowledged");
494 eap_wsc_state(data, MESG);
495 return eap_wsc_build_msg(data, ret, id);
496 }
497
498 if (op_code != WSC_ACK && op_code != WSC_NACK && op_code != WSC_MSG &&
499 op_code != WSC_Done && op_code != WSC_Start) {
500 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
501 op_code);
502 ret->ignore = true;
503 return NULL;
504 }
505
506 if (data->state == WAIT_START) {
507 if (op_code != WSC_Start) {
508 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
509 "in WAIT_START state", op_code);
510 ret->ignore = true;
511 return NULL;
512 }
513 wpa_printf(MSG_DEBUG, "EAP-WSC: Received start");
514 eap_wsc_state(data, MESG);
515 /* Start message has empty payload, skip processing */
516 goto send_msg;
517 } else if (op_code == WSC_Start) {
518 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
519 op_code);
520 ret->ignore = true;
521 return NULL;
522 }
523
524 if (data->in_buf &&
525 eap_wsc_process_cont(data, pos, end - pos, op_code) < 0) {
526 ret->ignore = true;
527 return NULL;
528 }
529
530 if (flags & WSC_FLAGS_MF) {
531 return eap_wsc_process_fragment(data, ret, id, flags, op_code,
532 message_length, pos,
533 end - pos);
534 }
535
536 if (data->in_buf == NULL) {
537 /* Wrap unfragmented messages as wpabuf without extra copy */
538 wpabuf_set(&tmpbuf, pos, end - pos);
539 data->in_buf = &tmpbuf;
540 }
541
542 res = wps_process_msg(data->wps, op_code, data->in_buf);
543 switch (res) {
544 case WPS_DONE:
545 wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing completed "
546 "successfully - wait for EAP failure");
547 eap_wsc_state(data, FAIL);
548 break;
549 case WPS_CONTINUE:
550 eap_wsc_state(data, MESG);
551 break;
552 case WPS_FAILURE:
553 case WPS_PENDING:
554 wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing failed");
555 eap_wsc_state(data, FAIL);
556 break;
557 }
558
559 if (data->in_buf != &tmpbuf)
560 wpabuf_free(data->in_buf);
561 data->in_buf = NULL;
562
563 send_msg:
564 if (data->out_buf == NULL) {
565 data->out_buf = wps_get_msg(data->wps, &data->out_op_code);
566 if (data->out_buf == NULL) {
567 wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to receive "
568 "message from WPS");
569 eap_wsc_state(data, FAIL);
570 ret->methodState = METHOD_DONE;
571 ret->decision = DECISION_FAIL;
572 return NULL;
573 }
574 data->out_used = 0;
575 }
576
577 eap_wsc_state(data, MESG);
578 r = eap_wsc_build_msg(data, ret, id);
579 if (data->state == FAIL && ret->methodState == METHOD_DONE) {
580 /* Use reduced client timeout for WPS to avoid long wait */
581 if (sm->ClientTimeout > 2)
582 sm->ClientTimeout = 2;
583 }
584 return r;
585 }
586
587
eap_peer_wsc_register(void)588 int eap_peer_wsc_register(void)
589 {
590 struct eap_method *eap;
591
592 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
593 EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
594 "WSC");
595 if (eap == NULL)
596 return -1;
597
598 eap->init = eap_wsc_init;
599 eap->deinit = eap_wsc_deinit;
600 eap->process = eap_wsc_process;
601
602 return eap_peer_method_register(eap);
603 }
604