Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / eap_peer / eap_wsc.c
CommitLineData
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1/*
2 * EAP-WSC peer for Wi-Fi Protected Setup
4781064b 3 * Copyright (c) 2007-2009, 2012, Jouni Malinen <j@w1.fi>
a875087d 4 *
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5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
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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
19struct eap_wsc_data {
20 enum { WAIT_START, MESG, FRAG_ACK, WAIT_FRAG_ACK, DONE, 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
32static 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 FRAG_ACK:
40 return "FRAG_ACK";
41 case WAIT_FRAG_ACK:
42 return "WAIT_FRAG_ACK";
43 case DONE:
44 return "DONE";
45 case FAIL:
46 return "FAIL";
47 default:
48 return "?";
49 }
50}
51
52
53static void eap_wsc_state(struct eap_wsc_data *data, int state)
54{
55 wpa_printf(MSG_DEBUG, "EAP-WSC: %s -> %s",
56 eap_wsc_state_txt(data->state),
57 eap_wsc_state_txt(state));
58 data->state = state;
59}
60
61
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62static int eap_wsc_new_ap_settings(struct wps_credential *cred,
63 const char *params)
64{
65 const char *pos, *end;
66 size_t len;
67
68 os_memset(cred, 0, sizeof(*cred));
69
70 pos = os_strstr(params, "new_ssid=");
71 if (pos == NULL)
72 return 0;
73 pos += 9;
74 end = os_strchr(pos, ' ');
75 if (end == NULL)
76 len = os_strlen(pos);
77 else
78 len = end - pos;
79 if ((len & 1) || len > 2 * sizeof(cred->ssid) ||
80 hexstr2bin(pos, cred->ssid, len / 2)) {
81 wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid new_ssid");
82 return -1;
83 }
84 cred->ssid_len = len / 2;
85
86 pos = os_strstr(params, "new_auth=");
87 if (pos == NULL) {
88 wpa_printf(MSG_DEBUG, "EAP-WSC: Missing new_auth");
89 return -1;
90 }
91 if (os_strncmp(pos + 9, "OPEN", 4) == 0)
92 cred->auth_type = WPS_AUTH_OPEN;
93 else if (os_strncmp(pos + 9, "WPAPSK", 6) == 0)
94 cred->auth_type = WPS_AUTH_WPAPSK;
95 else if (os_strncmp(pos + 9, "WPA2PSK", 7) == 0)
96 cred->auth_type = WPS_AUTH_WPA2PSK;
97 else {
98 wpa_printf(MSG_DEBUG, "EAP-WSC: Unknown new_auth");
99 return -1;
100 }
101
102 pos = os_strstr(params, "new_encr=");
103 if (pos == NULL) {
104 wpa_printf(MSG_DEBUG, "EAP-WSC: Missing new_encr");
105 return -1;
106 }
107 if (os_strncmp(pos + 9, "NONE", 4) == 0)
108 cred->encr_type = WPS_ENCR_NONE;
109 else if (os_strncmp(pos + 9, "WEP", 3) == 0)
110 cred->encr_type = WPS_ENCR_WEP;
111 else if (os_strncmp(pos + 9, "TKIP", 4) == 0)
112 cred->encr_type = WPS_ENCR_TKIP;
113 else if (os_strncmp(pos + 9, "CCMP", 4) == 0)
114 cred->encr_type = WPS_ENCR_AES;
115 else {
116 wpa_printf(MSG_DEBUG, "EAP-WSC: Unknown new_encr");
117 return -1;
118 }
119
120 pos = os_strstr(params, "new_key=");
121 if (pos == NULL)
122 return 0;
123 pos += 8;
124 end = os_strchr(pos, ' ');
125 if (end == NULL)
126 len = os_strlen(pos);
127 else
128 len = end - pos;
129 if ((len & 1) || len > 2 * sizeof(cred->key) ||
130 hexstr2bin(pos, cred->key, len / 2)) {
131 wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid new_key");
132 return -1;
133 }
134 cred->key_len = len / 2;
135
136 return 1;
137}
138
139
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140static void * eap_wsc_init(struct eap_sm *sm)
141{
142 struct eap_wsc_data *data;
143 const u8 *identity;
144 size_t identity_len;
145 int registrar;
146 struct wps_config cfg;
4781064b 147 const char *pos, *end;
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148 const char *phase1;
149 struct wps_context *wps;
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150 struct wps_credential new_ap_settings;
151 int res;
152 int nfc = 0;
153 u8 pkhash[WPS_OOB_PUBKEY_HASH_LEN];
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154
155 wps = sm->wps;
156 if (wps == NULL) {
157 wpa_printf(MSG_ERROR, "EAP-WSC: WPS context not available");
158 return NULL;
159 }
160
161 identity = eap_get_config_identity(sm, &identity_len);
162
163 if (identity && identity_len == WSC_ID_REGISTRAR_LEN &&
164 os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0)
165 registrar = 1; /* Supplicant is Registrar */
166 else if (identity && identity_len == WSC_ID_ENROLLEE_LEN &&
167 os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0)
168 registrar = 0; /* Supplicant is Enrollee */
169 else {
170 wpa_hexdump_ascii(MSG_INFO, "EAP-WSC: Unexpected identity",
171 identity, identity_len);
172 return NULL;
173 }
174
175 data = os_zalloc(sizeof(*data));
176 if (data == NULL)
177 return NULL;
178 data->state = registrar ? MESG : WAIT_START;
179 data->registrar = registrar;
180 data->wps_ctx = wps;
181
182 os_memset(&cfg, 0, sizeof(cfg));
183 cfg.wps = wps;
184 cfg.registrar = registrar;
185
186 phase1 = eap_get_config_phase1(sm);
187 if (phase1 == NULL) {
188 wpa_printf(MSG_INFO, "EAP-WSC: phase1 configuration data not "
189 "set");
190 os_free(data);
191 return NULL;
192 }
193
194 pos = os_strstr(phase1, "pin=");
195 if (pos) {
196 pos += 4;
197 cfg.pin = (const u8 *) pos;
198 while (*pos != '\0' && *pos != ' ')
199 pos++;
200 cfg.pin_len = pos - (const char *) cfg.pin;
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201 if (cfg.pin_len == 6 &&
202 os_strncmp((const char *) cfg.pin, "nfc-pw", 6) == 0) {
203 cfg.pin = NULL;
204 cfg.pin_len = 0;
205 nfc = 1;
206 }
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207 } else {
208 pos = os_strstr(phase1, "pbc=1");
209 if (pos)
210 cfg.pbc = 1;
211 }
212
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213 pos = os_strstr(phase1, "dev_pw_id=");
214 if (pos) {
215 u16 id = atoi(pos + 10);
216 if (id == DEV_PW_NFC_CONNECTION_HANDOVER)
217 nfc = 1;
218 if (cfg.pin || id == DEV_PW_NFC_CONNECTION_HANDOVER)
219 cfg.dev_pw_id = id;
220 }
221
222 if (cfg.pin == NULL && !cfg.pbc && !nfc) {
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223 wpa_printf(MSG_INFO, "EAP-WSC: PIN or PBC not set in phase1 "
224 "configuration data");
225 os_free(data);
226 return NULL;
227 }
228
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229 pos = os_strstr(phase1, " pkhash=");
230 if (pos) {
231 size_t len;
232 pos += 8;
233 end = os_strchr(pos, ' ');
234 if (end)
235 len = end - pos;
236 else
237 len = os_strlen(pos);
238 if (len != 2 * WPS_OOB_PUBKEY_HASH_LEN ||
239 hexstr2bin(pos, pkhash, WPS_OOB_PUBKEY_HASH_LEN)) {
240 wpa_printf(MSG_INFO, "EAP-WSC: Invalid pkhash");
241 os_free(data);
242 return NULL;
243 }
244 cfg.peer_pubkey_hash = pkhash;
245 }
246
247 res = eap_wsc_new_ap_settings(&new_ap_settings, phase1);
248 if (res < 0) {
249 os_free(data);
250 wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to parse new AP "
251 "settings");
252 return NULL;
253 }
254 if (res == 1) {
255 wpa_printf(MSG_DEBUG, "EAP-WSC: Provide new AP settings for "
256 "WPS");
257 cfg.new_ap_settings = &new_ap_settings;
258 }
259
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260 data->wps = wps_init(&cfg);
261 if (data->wps == NULL) {
262 os_free(data);
4781064b 263 wpa_printf(MSG_DEBUG, "EAP-WSC: wps_init failed");
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264 return NULL;
265 }
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266 res = eap_get_config_fragment_size(sm);
267 if (res > 0)
268 data->fragment_size = res;
269 else
270 data->fragment_size = WSC_FRAGMENT_SIZE;
271 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment size limit %u",
272 (unsigned int) data->fragment_size);
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273
274 if (registrar && cfg.pin) {
4781064b 275 wps_registrar_add_pin(data->wps_ctx->registrar, NULL, NULL,
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276 cfg.pin, cfg.pin_len, 0);
277 }
278
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279 /* Use reduced client timeout for WPS to avoid long wait */
280 if (sm->ClientTimeout > 30)
281 sm->ClientTimeout = 30;
282
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283 return data;
284}
285
286
287static void eap_wsc_deinit(struct eap_sm *sm, void *priv)
288{
289 struct eap_wsc_data *data = priv;
290 wpabuf_free(data->in_buf);
291 wpabuf_free(data->out_buf);
292 wps_deinit(data->wps);
293 os_free(data->wps_ctx->network_key);
294 data->wps_ctx->network_key = NULL;
295 os_free(data);
296}
297
298
299static struct wpabuf * eap_wsc_build_msg(struct eap_wsc_data *data,
300 struct eap_method_ret *ret, u8 id)
301{
302 struct wpabuf *resp;
303 u8 flags;
304 size_t send_len, plen;
305
306 ret->ignore = FALSE;
307 wpa_printf(MSG_DEBUG, "EAP-WSC: Generating Response");
308 ret->allowNotifications = TRUE;
309
310 flags = 0;
311 send_len = wpabuf_len(data->out_buf) - data->out_used;
312 if (2 + send_len > data->fragment_size) {
313 send_len = data->fragment_size - 2;
314 flags |= WSC_FLAGS_MF;
315 if (data->out_used == 0) {
316 flags |= WSC_FLAGS_LF;
317 send_len -= 2;
318 }
319 }
320 plen = 2 + send_len;
321 if (flags & WSC_FLAGS_LF)
322 plen += 2;
323 resp = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, plen,
324 EAP_CODE_RESPONSE, id);
325 if (resp == NULL)
326 return NULL;
327
328 wpabuf_put_u8(resp, data->out_op_code); /* Op-Code */
329 wpabuf_put_u8(resp, flags); /* Flags */
330 if (flags & WSC_FLAGS_LF)
331 wpabuf_put_be16(resp, wpabuf_len(data->out_buf));
332
333 wpabuf_put_data(resp, wpabuf_head_u8(data->out_buf) + data->out_used,
334 send_len);
335 data->out_used += send_len;
336
337 ret->methodState = METHOD_MAY_CONT;
338 ret->decision = DECISION_FAIL;
339
340 if (data->out_used == wpabuf_len(data->out_buf)) {
341 wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
342 "(message sent completely)",
343 (unsigned long) send_len);
344 wpabuf_free(data->out_buf);
345 data->out_buf = NULL;
346 data->out_used = 0;
347 if ((data->state == FAIL && data->out_op_code == WSC_ACK) ||
348 data->out_op_code == WSC_NACK ||
349 data->out_op_code == WSC_Done) {
350 eap_wsc_state(data, FAIL);
351 ret->methodState = METHOD_DONE;
352 } else
353 eap_wsc_state(data, MESG);
354 } else {
355 wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
356 "(%lu more to send)", (unsigned long) send_len,
357 (unsigned long) wpabuf_len(data->out_buf) -
358 data->out_used);
359 eap_wsc_state(data, WAIT_FRAG_ACK);
360 }
361
362 return resp;
363}
364
365
366static int eap_wsc_process_cont(struct eap_wsc_data *data,
367 const u8 *buf, size_t len, u8 op_code)
368{
369 /* Process continuation of a pending message */
370 if (op_code != data->in_op_code) {
371 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d in "
372 "fragment (expected %d)",
373 op_code, data->in_op_code);
374 return -1;
375 }
376
377 if (len > wpabuf_tailroom(data->in_buf)) {
378 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment overflow");
379 eap_wsc_state(data, FAIL);
380 return -1;
381 }
382
383 wpabuf_put_data(data->in_buf, buf, len);
384 wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes, waiting "
385 "for %lu bytes more", (unsigned long) len,
386 (unsigned long) wpabuf_tailroom(data->in_buf));
387
388 return 0;
389}
390
391
392static struct wpabuf * eap_wsc_process_fragment(struct eap_wsc_data *data,
393 struct eap_method_ret *ret,
394 u8 id, u8 flags, u8 op_code,
395 u16 message_length,
396 const u8 *buf, size_t len)
397{
398 /* Process a fragment that is not the last one of the message */
399 if (data->in_buf == NULL && !(flags & WSC_FLAGS_LF)) {
400 wpa_printf(MSG_DEBUG, "EAP-WSC: No Message Length field in a "
401 "fragmented packet");
402 ret->ignore = TRUE;
403 return NULL;
404 }
405
406 if (data->in_buf == NULL) {
407 /* First fragment of the message */
408 data->in_buf = wpabuf_alloc(message_length);
409 if (data->in_buf == NULL) {
410 wpa_printf(MSG_DEBUG, "EAP-WSC: No memory for "
411 "message");
412 ret->ignore = TRUE;
413 return NULL;
414 }
415 data->in_op_code = op_code;
416 wpabuf_put_data(data->in_buf, buf, len);
417 wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes in first "
418 "fragment, waiting for %lu bytes more",
419 (unsigned long) len,
420 (unsigned long) wpabuf_tailroom(data->in_buf));
421 }
422
423 return eap_wsc_build_frag_ack(id, EAP_CODE_RESPONSE);
424}
425
426
427static struct wpabuf * eap_wsc_process(struct eap_sm *sm, void *priv,
428 struct eap_method_ret *ret,
429 const struct wpabuf *reqData)
430{
431 struct eap_wsc_data *data = priv;
432 const u8 *start, *pos, *end;
433 size_t len;
434 u8 op_code, flags, id;
435 u16 message_length = 0;
436 enum wps_process_res res;
437 struct wpabuf tmpbuf;
4781064b 438 struct wpabuf *r;
a875087d
JL
439
440 pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, reqData,
441 &len);
442 if (pos == NULL || len < 2) {
443 ret->ignore = TRUE;
444 return NULL;
445 }
446
447 id = eap_get_id(reqData);
448
449 start = pos;
450 end = start + len;
451
452 op_code = *pos++;
453 flags = *pos++;
454 if (flags & WSC_FLAGS_LF) {
455 if (end - pos < 2) {
456 wpa_printf(MSG_DEBUG, "EAP-WSC: Message underflow");
457 ret->ignore = TRUE;
458 return NULL;
459 }
460 message_length = WPA_GET_BE16(pos);
461 pos += 2;
462
463 if (message_length < end - pos) {
464 wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid Message "
465 "Length");
466 ret->ignore = TRUE;
467 return NULL;
468 }
469 }
470
471 wpa_printf(MSG_DEBUG, "EAP-WSC: Received packet: Op-Code %d "
472 "Flags 0x%x Message Length %d",
473 op_code, flags, message_length);
474
475 if (data->state == WAIT_FRAG_ACK) {
476 if (op_code != WSC_FRAG_ACK) {
477 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
478 "in WAIT_FRAG_ACK state", op_code);
479 ret->ignore = TRUE;
480 return NULL;
481 }
482 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment acknowledged");
483 eap_wsc_state(data, MESG);
484 return eap_wsc_build_msg(data, ret, id);
485 }
486
487 if (op_code != WSC_ACK && op_code != WSC_NACK && op_code != WSC_MSG &&
488 op_code != WSC_Done && op_code != WSC_Start) {
489 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
490 op_code);
491 ret->ignore = TRUE;
492 return NULL;
493 }
494
495 if (data->state == WAIT_START) {
496 if (op_code != WSC_Start) {
497 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
498 "in WAIT_START state", op_code);
499 ret->ignore = TRUE;
500 return NULL;
501 }
502 wpa_printf(MSG_DEBUG, "EAP-WSC: Received start");
503 eap_wsc_state(data, MESG);
504 /* Start message has empty payload, skip processing */
505 goto send_msg;
506 } else if (op_code == WSC_Start) {
507 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
508 op_code);
509 ret->ignore = TRUE;
510 return NULL;
511 }
512
513 if (data->in_buf &&
514 eap_wsc_process_cont(data, pos, end - pos, op_code) < 0) {
515 ret->ignore = TRUE;
516 return NULL;
517 }
518
519 if (flags & WSC_FLAGS_MF) {
520 return eap_wsc_process_fragment(data, ret, id, flags, op_code,
521 message_length, pos,
522 end - pos);
523 }
524
525 if (data->in_buf == NULL) {
526 /* Wrap unfragmented messages as wpabuf without extra copy */
527 wpabuf_set(&tmpbuf, pos, end - pos);
528 data->in_buf = &tmpbuf;
529 }
530
531 res = wps_process_msg(data->wps, op_code, data->in_buf);
532 switch (res) {
533 case WPS_DONE:
534 wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing completed "
535 "successfully - wait for EAP failure");
536 eap_wsc_state(data, FAIL);
537 break;
538 case WPS_CONTINUE:
539 eap_wsc_state(data, MESG);
540 break;
541 case WPS_FAILURE:
542 case WPS_PENDING:
543 wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing failed");
544 eap_wsc_state(data, FAIL);
545 break;
546 }
547
548 if (data->in_buf != &tmpbuf)
549 wpabuf_free(data->in_buf);
550 data->in_buf = NULL;
551
552send_msg:
553 if (data->out_buf == NULL) {
554 data->out_buf = wps_get_msg(data->wps, &data->out_op_code);
555 if (data->out_buf == NULL) {
556 wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to receive "
557 "message from WPS");
558 return NULL;
559 }
560 data->out_used = 0;
561 }
562
563 eap_wsc_state(data, MESG);
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564 r = eap_wsc_build_msg(data, ret, id);
565 if (data->state == FAIL && ret->methodState == METHOD_DONE) {
566 /* Use reduced client timeout for WPS to avoid long wait */
567 if (sm->ClientTimeout > 2)
568 sm->ClientTimeout = 2;
569 }
570 return r;
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571}
572
573
574int eap_peer_wsc_register(void)
575{
576 struct eap_method *eap;
577 int ret;
578
579 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
580 EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
581 "WSC");
582 if (eap == NULL)
583 return -1;
584
585 eap->init = eap_wsc_init;
586 eap->deinit = eap_wsc_deinit;
587 eap->process = eap_wsc_process;
588
589 ret = eap_peer_method_register(eap);
590 if (ret)
591 eap_peer_method_free(eap);
592 return ret;
593}