2 * EAP-WSC peer for Wi-Fi Protected Setup
3 * Copyright (c) 2007-2009, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
20 #include "eap_common/eap_wsc_common.h"
22 #include "wps/wps_defs.h"
26 enum { WAIT_START, MESG, FRAG_ACK, WAIT_FRAG_ACK, DONE, FAIL } state;
28 struct wpabuf *in_buf;
29 struct wpabuf *out_buf;
30 enum wsc_op_code in_op_code, out_op_code;
34 struct wps_context *wps_ctx;
38 static const char * eap_wsc_state_txt(int state)
48 return "WAIT_FRAG_ACK";
59 static void eap_wsc_state(struct eap_wsc_data *data, int state)
61 wpa_printf(MSG_DEBUG, "EAP-WSC: %s -> %s",
62 eap_wsc_state_txt(data->state),
63 eap_wsc_state_txt(state));
68 static int eap_wsc_new_ap_settings(struct wps_credential *cred,
71 const char *pos, *end;
74 os_memset(cred, 0, sizeof(*cred));
76 pos = os_strstr(params, "new_ssid=");
80 end = os_strchr(pos, ' ');
85 if ((len & 1) || len > 2 * sizeof(cred->ssid) ||
86 hexstr2bin(pos, cred->ssid, len / 2))
88 cred->ssid_len = len / 2;
90 pos = os_strstr(params, "new_auth=");
93 if (os_strncmp(pos + 9, "OPEN", 4) == 0)
94 cred->auth_type = WPS_AUTH_OPEN;
95 else if (os_strncmp(pos + 9, "WPAPSK", 6) == 0)
96 cred->auth_type = WPS_AUTH_WPAPSK;
97 else if (os_strncmp(pos + 9, "WPA2PSK", 7) == 0)
98 cred->auth_type = WPS_AUTH_WPA2PSK;
102 pos = os_strstr(params, "new_encr=");
105 if (os_strncmp(pos + 9, "NONE", 4) == 0)
106 cred->encr_type = WPS_ENCR_NONE;
107 else if (os_strncmp(pos + 9, "WEP", 3) == 0)
108 cred->encr_type = WPS_ENCR_WEP;
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;
116 pos = os_strstr(params, "new_key=");
120 end = os_strchr(pos, ' ');
122 len = os_strlen(pos);
125 if ((len & 1) || len > 2 * sizeof(cred->key) ||
126 hexstr2bin(pos, cred->key, len / 2))
128 cred->key_len = len / 2;
134 static void * eap_wsc_init(struct eap_sm *sm)
136 struct eap_wsc_data *data;
140 struct wps_config cfg;
143 struct wps_context *wps;
144 struct wps_credential new_ap_settings;
149 wpa_printf(MSG_ERROR, "EAP-WSC: WPS context not available");
153 identity = eap_get_config_identity(sm, &identity_len);
155 if (identity && identity_len == WSC_ID_REGISTRAR_LEN &&
156 os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0)
157 registrar = 1; /* Supplicant is Registrar */
158 else if (identity && identity_len == WSC_ID_ENROLLEE_LEN &&
159 os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0)
160 registrar = 0; /* Supplicant is Enrollee */
162 wpa_hexdump_ascii(MSG_INFO, "EAP-WSC: Unexpected identity",
163 identity, identity_len);
167 data = os_zalloc(sizeof(*data));
170 data->state = registrar ? MESG : WAIT_START;
171 data->registrar = registrar;
174 os_memset(&cfg, 0, sizeof(cfg));
176 cfg.registrar = registrar;
178 phase1 = eap_get_config_phase1(sm);
179 if (phase1 == NULL) {
180 wpa_printf(MSG_INFO, "EAP-WSC: phase1 configuration data not "
186 pos = os_strstr(phase1, "pin=");
189 cfg.pin = (const u8 *) pos;
190 while (*pos != '\0' && *pos != ' ')
192 cfg.pin_len = pos - (const char *) cfg.pin;
194 pos = os_strstr(phase1, "pbc=1");
199 if (cfg.pin == NULL && !cfg.pbc) {
200 wpa_printf(MSG_INFO, "EAP-WSC: PIN or PBC not set in phase1 "
201 "configuration data");
206 pos = os_strstr(phase1, "dev_pw_id=");
208 cfg.dev_pw_id = atoi(pos + 10);
210 res = eap_wsc_new_ap_settings(&new_ap_settings, phase1);
216 wpa_printf(MSG_DEBUG, "EAP-WSC: Provide new AP settings for "
218 cfg.new_ap_settings = &new_ap_settings;
221 data->wps = wps_init(&cfg);
222 if (data->wps == NULL) {
226 res = eap_get_config_fragment_size(sm);
228 data->fragment_size = res;
230 data->fragment_size = WSC_FRAGMENT_SIZE;
231 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment size limit %u",
232 (unsigned int) data->fragment_size);
234 if (registrar && cfg.pin) {
235 wps_registrar_add_pin(data->wps_ctx->registrar, NULL, NULL,
236 cfg.pin, cfg.pin_len, 0);
239 /* Use reduced client timeout for WPS to avoid long wait */
240 if (sm->ClientTimeout > 30)
241 sm->ClientTimeout = 30;
247 static void eap_wsc_deinit(struct eap_sm *sm, void *priv)
249 struct eap_wsc_data *data = priv;
250 wpabuf_free(data->in_buf);
251 wpabuf_free(data->out_buf);
252 wps_deinit(data->wps);
253 os_free(data->wps_ctx->network_key);
254 data->wps_ctx->network_key = NULL;
259 static struct wpabuf * eap_wsc_build_msg(struct eap_wsc_data *data,
260 struct eap_method_ret *ret, u8 id)
264 size_t send_len, plen;
267 wpa_printf(MSG_DEBUG, "EAP-WSC: Generating Response");
268 ret->allowNotifications = TRUE;
271 send_len = wpabuf_len(data->out_buf) - data->out_used;
272 if (2 + send_len > data->fragment_size) {
273 send_len = data->fragment_size - 2;
274 flags |= WSC_FLAGS_MF;
275 if (data->out_used == 0) {
276 flags |= WSC_FLAGS_LF;
281 if (flags & WSC_FLAGS_LF)
283 resp = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, plen,
284 EAP_CODE_RESPONSE, id);
288 wpabuf_put_u8(resp, data->out_op_code); /* Op-Code */
289 wpabuf_put_u8(resp, flags); /* Flags */
290 if (flags & WSC_FLAGS_LF)
291 wpabuf_put_be16(resp, wpabuf_len(data->out_buf));
293 wpabuf_put_data(resp, wpabuf_head_u8(data->out_buf) + data->out_used,
295 data->out_used += send_len;
297 ret->methodState = METHOD_MAY_CONT;
298 ret->decision = DECISION_FAIL;
300 if (data->out_used == wpabuf_len(data->out_buf)) {
301 wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
302 "(message sent completely)",
303 (unsigned long) send_len);
304 wpabuf_free(data->out_buf);
305 data->out_buf = NULL;
307 if ((data->state == FAIL && data->out_op_code == WSC_ACK) ||
308 data->out_op_code == WSC_NACK ||
309 data->out_op_code == WSC_Done) {
310 eap_wsc_state(data, FAIL);
311 ret->methodState = METHOD_DONE;
313 eap_wsc_state(data, MESG);
315 wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
316 "(%lu more to send)", (unsigned long) send_len,
317 (unsigned long) wpabuf_len(data->out_buf) -
319 eap_wsc_state(data, WAIT_FRAG_ACK);
326 static int eap_wsc_process_cont(struct eap_wsc_data *data,
327 const u8 *buf, size_t len, u8 op_code)
329 /* Process continuation of a pending message */
330 if (op_code != data->in_op_code) {
331 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d in "
332 "fragment (expected %d)",
333 op_code, data->in_op_code);
337 if (len > wpabuf_tailroom(data->in_buf)) {
338 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment overflow");
339 eap_wsc_state(data, FAIL);
343 wpabuf_put_data(data->in_buf, buf, len);
344 wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes, waiting "
345 "for %lu bytes more", (unsigned long) len,
346 (unsigned long) wpabuf_tailroom(data->in_buf));
352 static struct wpabuf * eap_wsc_process_fragment(struct eap_wsc_data *data,
353 struct eap_method_ret *ret,
354 u8 id, u8 flags, u8 op_code,
356 const u8 *buf, size_t len)
358 /* Process a fragment that is not the last one of the message */
359 if (data->in_buf == NULL && !(flags & WSC_FLAGS_LF)) {
360 wpa_printf(MSG_DEBUG, "EAP-WSC: No Message Length field in a "
361 "fragmented packet");
366 if (data->in_buf == NULL) {
367 /* First fragment of the message */
368 data->in_buf = wpabuf_alloc(message_length);
369 if (data->in_buf == NULL) {
370 wpa_printf(MSG_DEBUG, "EAP-WSC: No memory for "
375 data->in_op_code = op_code;
376 wpabuf_put_data(data->in_buf, buf, len);
377 wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes in first "
378 "fragment, waiting for %lu bytes more",
380 (unsigned long) wpabuf_tailroom(data->in_buf));
383 return eap_wsc_build_frag_ack(id, EAP_CODE_RESPONSE);
387 static struct wpabuf * eap_wsc_process(struct eap_sm *sm, void *priv,
388 struct eap_method_ret *ret,
389 const struct wpabuf *reqData)
391 struct eap_wsc_data *data = priv;
392 const u8 *start, *pos, *end;
394 u8 op_code, flags, id;
395 u16 message_length = 0;
396 enum wps_process_res res;
397 struct wpabuf tmpbuf;
400 pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, reqData,
402 if (pos == NULL || len < 2) {
407 id = eap_get_id(reqData);
414 if (flags & WSC_FLAGS_LF) {
416 wpa_printf(MSG_DEBUG, "EAP-WSC: Message underflow");
420 message_length = WPA_GET_BE16(pos);
423 if (message_length < end - pos) {
424 wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid Message "
431 wpa_printf(MSG_DEBUG, "EAP-WSC: Received packet: Op-Code %d "
432 "Flags 0x%x Message Length %d",
433 op_code, flags, message_length);
435 if (data->state == WAIT_FRAG_ACK) {
436 if (op_code != WSC_FRAG_ACK) {
437 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
438 "in WAIT_FRAG_ACK state", op_code);
442 wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment acknowledged");
443 eap_wsc_state(data, MESG);
444 return eap_wsc_build_msg(data, ret, id);
447 if (op_code != WSC_ACK && op_code != WSC_NACK && op_code != WSC_MSG &&
448 op_code != WSC_Done && op_code != WSC_Start) {
449 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
455 if (data->state == WAIT_START) {
456 if (op_code != WSC_Start) {
457 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
458 "in WAIT_START state", op_code);
462 wpa_printf(MSG_DEBUG, "EAP-WSC: Received start");
463 eap_wsc_state(data, MESG);
464 /* Start message has empty payload, skip processing */
466 } else if (op_code == WSC_Start) {
467 wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
474 eap_wsc_process_cont(data, pos, end - pos, op_code) < 0) {
479 if (flags & WSC_FLAGS_MF) {
480 return eap_wsc_process_fragment(data, ret, id, flags, op_code,
485 if (data->in_buf == NULL) {
486 /* Wrap unfragmented messages as wpabuf without extra copy */
487 wpabuf_set(&tmpbuf, pos, end - pos);
488 data->in_buf = &tmpbuf;
491 res = wps_process_msg(data->wps, op_code, data->in_buf);
494 wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing completed "
495 "successfully - wait for EAP failure");
496 eap_wsc_state(data, FAIL);
499 eap_wsc_state(data, MESG);
503 wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing failed");
504 eap_wsc_state(data, FAIL);
508 if (data->in_buf != &tmpbuf)
509 wpabuf_free(data->in_buf);
513 if (data->out_buf == NULL) {
514 data->out_buf = wps_get_msg(data->wps, &data->out_op_code);
515 if (data->out_buf == NULL) {
516 wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to receive "
523 eap_wsc_state(data, MESG);
524 r = eap_wsc_build_msg(data, ret, id);
525 if (data->state == FAIL && ret->methodState == METHOD_DONE) {
526 /* Use reduced client timeout for WPS to avoid long wait */
527 if (sm->ClientTimeout > 2)
528 sm->ClientTimeout = 2;
534 int eap_peer_wsc_register(void)
536 struct eap_method *eap;
539 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
540 EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
545 eap->init = eap_wsc_init;
546 eap->deinit = eap_wsc_deinit;
547 eap->process = eap_wsc_process;
549 ret = eap_peer_method_register(eap);
551 eap_peer_method_free(eap);