2 * EAP-WSC peer for Wi-Fi Protected Setup
3 * Copyright (c) 2007-2009, 2012, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
14 #include "eap_common/eap_wsc_common.h"
16 #include "wps/wps_defs.h"
20 enum { WAIT_START, MESG, WAIT_FRAG_ACK, FAIL } state;
22 struct wpabuf *in_buf;
23 struct wpabuf *out_buf;
24 enum wsc_op_code in_op_code, out_op_code;
28 struct wps_context *wps_ctx;
32 static const char * eap_wsc_state_txt(int state)
40 return "WAIT_FRAG_ACK";
49 static void eap_wsc_state(struct eap_wsc_data *data, int state)
51 wpa_printf(MSG_DEBUG, "EAP-WSC: %s -> %s",
52 eap_wsc_state_txt(data->state),
53 eap_wsc_state_txt(state));
58 static int eap_wsc_new_ap_settings(struct wps_credential *cred,
61 const char *pos, *end;
64 os_memset(cred, 0, sizeof(*cred));
66 pos = os_strstr(params, "new_ssid=");
70 end = os_strchr(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");
80 cred->ssid_len = len / 2;
82 pos = os_strstr(params, "new_auth=");
84 wpa_printf(MSG_DEBUG, "EAP-WSC: Missing new_auth");
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;
94 wpa_printf(MSG_DEBUG, "EAP-WSC: Unknown new_auth");
98 pos = os_strstr(params, "new_encr=");
100 wpa_printf(MSG_DEBUG, "EAP-WSC: Missing new_encr");
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;
114 wpa_printf(MSG_DEBUG, "EAP-WSC: Unknown new_encr");
118 pos = os_strstr(params, "new_key=");
122 end = os_strchr(pos, ' ');
124 len = os_strlen(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");
132 cred->key_len = len / 2;
138 static void * eap_wsc_init(struct eap_sm *sm)
140 struct eap_wsc_data *data;
144 struct wps_config cfg;
145 const char *pos, *end;
147 struct wps_context *wps;
148 struct wps_credential new_ap_settings;
151 u8 pkhash[WPS_OOB_PUBKEY_HASH_LEN];
155 wpa_printf(MSG_ERROR, "EAP-WSC: WPS context not available");
159 identity = eap_get_config_identity(sm, &identity_len);
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 */
168 wpa_hexdump_ascii(MSG_INFO, "EAP-WSC: Unexpected identity",
169 identity, identity_len);
173 data = os_zalloc(sizeof(*data));
176 data->state = registrar ? MESG : WAIT_START;
177 data->registrar = registrar;
180 os_memset(&cfg, 0, sizeof(cfg));
182 cfg.registrar = registrar;
184 phase1 = eap_get_config_phase1(sm);
185 if (phase1 == NULL) {
186 wpa_printf(MSG_INFO, "EAP-WSC: phase1 configuration data not "
192 pos = os_strstr(phase1, "pin=");
195 cfg.pin = (const u8 *) pos;
196 while (*pos != '\0' && *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) {
206 pos = os_strstr(phase1, "pbc=1");
211 pos = os_strstr(phase1, "dev_pw_id=");
213 u16 id = atoi(pos + 10);
214 if (id == DEV_PW_NFC_CONNECTION_HANDOVER)
216 if (cfg.pin || id == DEV_PW_NFC_CONNECTION_HANDOVER)
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");
227 pos = os_strstr(phase1, " pkhash=");
231 end = os_strchr(pos, ' ');
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");
242 cfg.peer_pubkey_hash = pkhash;
245 res = eap_wsc_new_ap_settings(&new_ap_settings, phase1);
248 wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to parse new AP "
253 wpa_printf(MSG_DEBUG, "EAP-WSC: Provide new AP settings for "
255 cfg.new_ap_settings = &new_ap_settings;
258 data->wps = wps_init(&cfg);
259 if (data->wps == NULL) {
261 wpa_printf(MSG_DEBUG, "EAP-WSC: wps_init failed");
264 res = eap_get_config_fragment_size(sm);
266 data->fragment_size = res;
268 data->fragment_size = WSC_FRAGMENT_SIZE;
269 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment size limit %u",
270 (unsigned int) data->fragment_size);
272 if (registrar && cfg.pin) {
273 wps_registrar_add_pin(data->wps_ctx->registrar, NULL, NULL,
274 cfg.pin, cfg.pin_len, 0);
277 /* Use reduced client timeout for WPS to avoid long wait */
278 if (sm->ClientTimeout > 30)
279 sm->ClientTimeout = 30;
285 static void eap_wsc_deinit(struct eap_sm *sm, void *priv)
287 struct eap_wsc_data *data = priv;
288 wpabuf_free(data->in_buf);
289 wpabuf_free(data->out_buf);
290 wps_deinit(data->wps);
291 os_free(data->wps_ctx->network_key);
292 data->wps_ctx->network_key = NULL;
297 static struct wpabuf * eap_wsc_build_msg(struct eap_wsc_data *data,
298 struct eap_method_ret *ret, u8 id)
302 size_t send_len, plen;
305 wpa_printf(MSG_DEBUG, "EAP-WSC: Generating Response");
306 ret->allowNotifications = TRUE;
309 send_len = wpabuf_len(data->out_buf) - data->out_used;
310 if (2 + send_len > data->fragment_size) {
311 send_len = data->fragment_size - 2;
312 flags |= WSC_FLAGS_MF;
313 if (data->out_used == 0) {
314 flags |= WSC_FLAGS_LF;
319 if (flags & WSC_FLAGS_LF)
321 resp = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, plen,
322 EAP_CODE_RESPONSE, id);
326 wpabuf_put_u8(resp, data->out_op_code); /* Op-Code */
327 wpabuf_put_u8(resp, flags); /* Flags */
328 if (flags & WSC_FLAGS_LF)
329 wpabuf_put_be16(resp, wpabuf_len(data->out_buf));
331 wpabuf_put_data(resp, wpabuf_head_u8(data->out_buf) + data->out_used,
333 data->out_used += send_len;
335 ret->methodState = METHOD_MAY_CONT;
336 ret->decision = DECISION_FAIL;
338 if (data->out_used == wpabuf_len(data->out_buf)) {
339 wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
340 "(message sent completely)",
341 (unsigned long) send_len);
342 wpabuf_free(data->out_buf);
343 data->out_buf = NULL;
345 if ((data->state == FAIL && data->out_op_code == WSC_ACK) ||
346 data->out_op_code == WSC_NACK ||
347 data->out_op_code == WSC_Done) {
348 eap_wsc_state(data, FAIL);
349 ret->methodState = METHOD_DONE;
351 eap_wsc_state(data, MESG);
353 wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
354 "(%lu more to send)", (unsigned long) send_len,
355 (unsigned long) wpabuf_len(data->out_buf) -
357 eap_wsc_state(data, WAIT_FRAG_ACK);
364 static int eap_wsc_process_cont(struct eap_wsc_data *data,
365 const u8 *buf, size_t len, u8 op_code)
367 /* Process continuation of a pending message */
368 if (op_code != data->in_op_code) {
369 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d in "
370 "fragment (expected %d)",
371 op_code, data->in_op_code);
375 if (len > wpabuf_tailroom(data->in_buf)) {
376 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment overflow");
377 eap_wsc_state(data, FAIL);
381 wpabuf_put_data(data->in_buf, buf, len);
382 wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes, waiting "
383 "for %lu bytes more", (unsigned long) len,
384 (unsigned long) wpabuf_tailroom(data->in_buf));
390 static struct wpabuf * eap_wsc_process_fragment(struct eap_wsc_data *data,
391 struct eap_method_ret *ret,
392 u8 id, u8 flags, u8 op_code,
394 const u8 *buf, size_t len)
396 /* Process a fragment that is not the last one of the message */
397 if (data->in_buf == NULL && !(flags & WSC_FLAGS_LF)) {
398 wpa_printf(MSG_DEBUG, "EAP-WSC: No Message Length field in a "
399 "fragmented packet");
404 if (data->in_buf == NULL) {
405 /* First fragment of the message */
406 data->in_buf = wpabuf_alloc(message_length);
407 if (data->in_buf == NULL) {
408 wpa_printf(MSG_DEBUG, "EAP-WSC: No memory for "
413 data->in_op_code = op_code;
414 wpabuf_put_data(data->in_buf, buf, len);
415 wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes in first "
416 "fragment, waiting for %lu bytes more",
418 (unsigned long) wpabuf_tailroom(data->in_buf));
421 return eap_wsc_build_frag_ack(id, EAP_CODE_RESPONSE);
425 static struct wpabuf * eap_wsc_process(struct eap_sm *sm, void *priv,
426 struct eap_method_ret *ret,
427 const struct wpabuf *reqData)
429 struct eap_wsc_data *data = priv;
430 const u8 *start, *pos, *end;
432 u8 op_code, flags, id;
433 u16 message_length = 0;
434 enum wps_process_res res;
435 struct wpabuf tmpbuf;
438 pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, reqData,
440 if (pos == NULL || len < 2) {
445 id = eap_get_id(reqData);
452 if (flags & WSC_FLAGS_LF) {
454 wpa_printf(MSG_DEBUG, "EAP-WSC: Message underflow");
458 message_length = WPA_GET_BE16(pos);
461 if (message_length < end - pos || message_length > 50000) {
462 wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid Message "
469 wpa_printf(MSG_DEBUG, "EAP-WSC: Received packet: Op-Code %d "
470 "Flags 0x%x Message Length %d",
471 op_code, flags, message_length);
473 if (data->state == WAIT_FRAG_ACK) {
474 if (op_code != WSC_FRAG_ACK) {
475 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
476 "in WAIT_FRAG_ACK state", op_code);
480 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment acknowledged");
481 eap_wsc_state(data, MESG);
482 return eap_wsc_build_msg(data, ret, id);
485 if (op_code != WSC_ACK && op_code != WSC_NACK && op_code != WSC_MSG &&
486 op_code != WSC_Done && op_code != WSC_Start) {
487 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
493 if (data->state == WAIT_START) {
494 if (op_code != WSC_Start) {
495 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
496 "in WAIT_START state", op_code);
500 wpa_printf(MSG_DEBUG, "EAP-WSC: Received start");
501 eap_wsc_state(data, MESG);
502 /* Start message has empty payload, skip processing */
504 } else if (op_code == WSC_Start) {
505 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
512 eap_wsc_process_cont(data, pos, end - pos, op_code) < 0) {
517 if (flags & WSC_FLAGS_MF) {
518 return eap_wsc_process_fragment(data, ret, id, flags, op_code,
523 if (data->in_buf == NULL) {
524 /* Wrap unfragmented messages as wpabuf without extra copy */
525 wpabuf_set(&tmpbuf, pos, end - pos);
526 data->in_buf = &tmpbuf;
529 res = wps_process_msg(data->wps, op_code, data->in_buf);
532 wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing completed "
533 "successfully - wait for EAP failure");
534 eap_wsc_state(data, FAIL);
537 eap_wsc_state(data, MESG);
541 wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing failed");
542 eap_wsc_state(data, FAIL);
546 if (data->in_buf != &tmpbuf)
547 wpabuf_free(data->in_buf);
551 if (data->out_buf == NULL) {
552 data->out_buf = wps_get_msg(data->wps, &data->out_op_code);
553 if (data->out_buf == NULL) {
554 wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to receive "
556 eap_wsc_state(data, FAIL);
557 ret->methodState = METHOD_DONE;
558 ret->decision = DECISION_FAIL;
564 eap_wsc_state(data, MESG);
565 r = eap_wsc_build_msg(data, ret, id);
566 if (data->state == FAIL && ret->methodState == METHOD_DONE) {
567 /* Use reduced client timeout for WPS to avoid long wait */
568 if (sm->ClientTimeout > 2)
569 sm->ClientTimeout = 2;
575 int eap_peer_wsc_register(void)
577 struct eap_method *eap;
579 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
580 EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
585 eap->init = eap_wsc_init;
586 eap->deinit = eap_wsc_deinit;
587 eap->process = eap_wsc_process;
589 return eap_peer_method_register(eap);