2 * EAP server method: EAP-TNC (Trusted Network Connect)
3 * Copyright (c) 2007-2010, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
18 START, CONTINUE, RECOMMENDATION, FRAG_ACK, WAIT_FRAG_ACK, DONE,
21 enum { ALLOW, ISOLATE, NO_ACCESS, NO_RECOMMENDATION } recommendation;
22 struct tncs_data *tncs;
23 struct wpabuf *in_buf;
24 struct wpabuf *out_buf;
27 unsigned int was_done:1;
28 unsigned int was_fail:1;
33 #define EAP_TNC_FLAGS_LENGTH_INCLUDED 0x80
34 #define EAP_TNC_FLAGS_MORE_FRAGMENTS 0x40
35 #define EAP_TNC_FLAGS_START 0x20
36 #define EAP_TNC_VERSION_MASK 0x07
38 #define EAP_TNC_VERSION 1
41 static const char * eap_tnc_state_txt(enum eap_tnc_state state)
49 return "RECOMMENDATION";
53 return "WAIT_FRAG_ACK";
63 static void eap_tnc_set_state(struct eap_tnc_data *data,
64 enum eap_tnc_state new_state)
66 wpa_printf(MSG_DEBUG, "EAP-TNC: %s -> %s",
67 eap_tnc_state_txt(data->state),
68 eap_tnc_state_txt(new_state));
69 data->state = new_state;
73 static void * eap_tnc_init(struct eap_sm *sm)
75 struct eap_tnc_data *data;
77 data = os_zalloc(sizeof(*data));
80 eap_tnc_set_state(data, START);
81 data->tncs = tncs_init();
82 if (data->tncs == NULL) {
87 data->fragment_size = sm->fragment_size > 100 ?
88 sm->fragment_size - 98 : 1300;
94 static void eap_tnc_reset(struct eap_sm *sm, void *priv)
96 struct eap_tnc_data *data = priv;
97 wpabuf_free(data->in_buf);
98 wpabuf_free(data->out_buf);
99 tncs_deinit(data->tncs);
104 static struct wpabuf * eap_tnc_build_start(struct eap_sm *sm,
105 struct eap_tnc_data *data, u8 id)
109 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, EAP_CODE_REQUEST,
112 wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory for "
114 eap_tnc_set_state(data, FAIL);
118 wpabuf_put_u8(req, EAP_TNC_FLAGS_START | EAP_TNC_VERSION);
120 eap_tnc_set_state(data, CONTINUE);
126 static struct wpabuf * eap_tnc_build(struct eap_sm *sm,
127 struct eap_tnc_data *data)
132 char *start_buf, *end_buf;
133 size_t start_len, end_len;
136 imv_len = tncs_total_send_len(data->tncs);
138 start_buf = tncs_if_tnccs_start(data->tncs);
139 if (start_buf == NULL)
141 start_len = os_strlen(start_buf);
142 end_buf = tncs_if_tnccs_end();
143 if (end_buf == NULL) {
147 end_len = os_strlen(end_buf);
149 rlen = start_len + imv_len + end_len;
150 req = wpabuf_alloc(rlen);
157 wpabuf_put_data(req, start_buf, start_len);
160 rpos1 = wpabuf_put(req, 0);
161 rpos = tncs_copy_send_buf(data->tncs, rpos1);
162 wpabuf_put(req, rpos - rpos1);
164 wpabuf_put_data(req, end_buf, end_len);
167 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Request",
168 wpabuf_head(req), wpabuf_len(req));
174 static struct wpabuf * eap_tnc_build_recommendation(struct eap_sm *sm,
175 struct eap_tnc_data *data)
177 switch (data->recommendation) {
179 eap_tnc_set_state(data, DONE);
182 eap_tnc_set_state(data, FAIL);
183 /* TODO: support assignment to a different VLAN */
186 eap_tnc_set_state(data, FAIL);
188 case NO_RECOMMENDATION:
189 eap_tnc_set_state(data, DONE);
192 wpa_printf(MSG_DEBUG, "EAP-TNC: Unknown recommendation");
196 return eap_tnc_build(sm, data);
200 static struct wpabuf * eap_tnc_build_frag_ack(u8 id, u8 code)
204 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, code, id);
206 wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory "
210 wpabuf_put_u8(msg, EAP_TNC_VERSION); /* Flags */
212 wpa_printf(MSG_DEBUG, "EAP-TNC: Send fragment ack");
218 static struct wpabuf * eap_tnc_build_msg(struct eap_tnc_data *data, u8 id)
222 size_t send_len, plen;
224 wpa_printf(MSG_DEBUG, "EAP-TNC: Generating Request");
226 flags = EAP_TNC_VERSION;
227 send_len = wpabuf_len(data->out_buf) - data->out_used;
228 if (1 + send_len > data->fragment_size) {
229 send_len = data->fragment_size - 1;
230 flags |= EAP_TNC_FLAGS_MORE_FRAGMENTS;
231 if (data->out_used == 0) {
232 flags |= EAP_TNC_FLAGS_LENGTH_INCLUDED;
238 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
240 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, plen,
241 EAP_CODE_REQUEST, id);
245 wpabuf_put_u8(req, flags); /* Flags */
246 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
247 wpabuf_put_be32(req, wpabuf_len(data->out_buf));
249 wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
251 data->out_used += send_len;
253 if (data->out_used == wpabuf_len(data->out_buf)) {
254 wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
255 "(message sent completely)",
256 (unsigned long) send_len);
257 wpabuf_free(data->out_buf);
258 data->out_buf = NULL;
261 eap_tnc_set_state(data, FAIL);
262 else if (data->was_done)
263 eap_tnc_set_state(data, DONE);
265 wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
266 "(%lu more to send)", (unsigned long) send_len,
267 (unsigned long) wpabuf_len(data->out_buf) -
269 if (data->state == FAIL)
271 else if (data->state == DONE)
273 eap_tnc_set_state(data, WAIT_FRAG_ACK);
280 static struct wpabuf * eap_tnc_buildReq(struct eap_sm *sm, void *priv, u8 id)
282 struct eap_tnc_data *data = priv;
284 switch (data->state) {
286 tncs_init_connection(data->tncs);
287 return eap_tnc_build_start(sm, data, id);
289 if (data->out_buf == NULL) {
290 data->out_buf = eap_tnc_build(sm, data);
291 if (data->out_buf == NULL) {
292 wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
298 return eap_tnc_build_msg(data, id);
300 if (data->out_buf == NULL) {
301 data->out_buf = eap_tnc_build_recommendation(sm, data);
302 if (data->out_buf == NULL) {
303 wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
304 "generate recommendation message");
309 return eap_tnc_build_msg(data, id);
311 return eap_tnc_build_msg(data, id);
313 return eap_tnc_build_frag_ack(id, EAP_CODE_REQUEST);
323 static Boolean eap_tnc_check(struct eap_sm *sm, void *priv,
324 struct wpabuf *respData)
326 struct eap_tnc_data *data = priv;
330 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData,
333 wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame");
337 if (len == 0 && data->state != WAIT_FRAG_ACK) {
338 wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame (empty)");
343 return FALSE; /* Fragment ACK does not include flags */
345 if ((*pos & EAP_TNC_VERSION_MASK) != EAP_TNC_VERSION) {
346 wpa_printf(MSG_DEBUG, "EAP-TNC: Unsupported version %d",
347 *pos & EAP_TNC_VERSION_MASK);
351 if (*pos & EAP_TNC_FLAGS_START) {
352 wpa_printf(MSG_DEBUG, "EAP-TNC: Peer used Start flag");
360 static void tncs_process(struct eap_tnc_data *data, struct wpabuf *inbuf)
362 enum tncs_process_res res;
364 res = tncs_process_if_tnccs(data->tncs, wpabuf_head(inbuf),
367 case TNCCS_RECOMMENDATION_ALLOW:
368 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS allowed access");
369 eap_tnc_set_state(data, RECOMMENDATION);
370 data->recommendation = ALLOW;
372 case TNCCS_RECOMMENDATION_NO_RECOMMENDATION:
373 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS has no recommendation");
374 eap_tnc_set_state(data, RECOMMENDATION);
375 data->recommendation = NO_RECOMMENDATION;
377 case TNCCS_RECOMMENDATION_ISOLATE:
378 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS requested isolation");
379 eap_tnc_set_state(data, RECOMMENDATION);
380 data->recommendation = ISOLATE;
382 case TNCCS_RECOMMENDATION_NO_ACCESS:
383 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS rejected access");
384 eap_tnc_set_state(data, RECOMMENDATION);
385 data->recommendation = NO_ACCESS;
387 case TNCCS_PROCESS_ERROR:
388 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS processing error");
389 eap_tnc_set_state(data, FAIL);
397 static int eap_tnc_process_cont(struct eap_tnc_data *data,
398 const u8 *buf, size_t len)
400 /* Process continuation of a pending message */
401 if (len > wpabuf_tailroom(data->in_buf)) {
402 wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment overflow");
403 eap_tnc_set_state(data, FAIL);
407 wpabuf_put_data(data->in_buf, buf, len);
408 wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes, waiting for %lu "
409 "bytes more", (unsigned long) len,
410 (unsigned long) wpabuf_tailroom(data->in_buf));
416 static int eap_tnc_process_fragment(struct eap_tnc_data *data,
417 u8 flags, u32 message_length,
418 const u8 *buf, size_t len)
420 /* Process a fragment that is not the last one of the message */
421 if (data->in_buf == NULL && !(flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)) {
422 wpa_printf(MSG_DEBUG, "EAP-TNC: No Message Length field in a "
423 "fragmented packet");
427 if (data->in_buf == NULL) {
428 /* First fragment of the message */
429 data->in_buf = wpabuf_alloc(message_length);
430 if (data->in_buf == NULL) {
431 wpa_printf(MSG_DEBUG, "EAP-TNC: No memory for "
435 wpabuf_put_data(data->in_buf, buf, len);
436 wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes in first "
437 "fragment, waiting for %lu bytes more",
439 (unsigned long) wpabuf_tailroom(data->in_buf));
446 static void eap_tnc_process(struct eap_sm *sm, void *priv,
447 struct wpabuf *respData)
449 struct eap_tnc_data *data = priv;
453 u32 message_length = 0;
454 struct wpabuf tmpbuf;
456 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData, &len);
458 return; /* Should not happen; message already verified */
462 if (len == 1 && (data->state == DONE || data->state == FAIL)) {
463 wpa_printf(MSG_DEBUG, "EAP-TNC: Peer acknowledged the last "
474 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED) {
476 wpa_printf(MSG_DEBUG, "EAP-TNC: Message underflow");
477 eap_tnc_set_state(data, FAIL);
480 message_length = WPA_GET_BE32(pos);
483 if (message_length < (u32) (end - pos)) {
484 wpa_printf(MSG_DEBUG, "EAP-TNC: Invalid Message "
485 "Length (%d; %ld remaining in this msg)",
486 message_length, (long) (end - pos));
487 eap_tnc_set_state(data, FAIL);
491 wpa_printf(MSG_DEBUG, "EAP-TNC: Received packet: Flags 0x%x "
492 "Message Length %u", flags, message_length);
494 if (data->state == WAIT_FRAG_ACK) {
496 wpa_printf(MSG_DEBUG, "EAP-TNC: Unexpected payload "
497 "in WAIT_FRAG_ACK state");
498 eap_tnc_set_state(data, FAIL);
501 wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment acknowledged");
502 eap_tnc_set_state(data, CONTINUE);
506 if (data->in_buf && eap_tnc_process_cont(data, pos, end - pos) < 0) {
507 eap_tnc_set_state(data, FAIL);
511 if (flags & EAP_TNC_FLAGS_MORE_FRAGMENTS) {
512 if (eap_tnc_process_fragment(data, flags, message_length,
514 eap_tnc_set_state(data, FAIL);
516 eap_tnc_set_state(data, FRAG_ACK);
518 } else if (data->state == FRAG_ACK) {
519 wpa_printf(MSG_DEBUG, "EAP-TNC: All fragments received");
520 eap_tnc_set_state(data, CONTINUE);
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 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Received payload",
530 wpabuf_head(data->in_buf), wpabuf_len(data->in_buf));
531 tncs_process(data, data->in_buf);
533 if (data->in_buf != &tmpbuf)
534 wpabuf_free(data->in_buf);
539 static Boolean eap_tnc_isDone(struct eap_sm *sm, void *priv)
541 struct eap_tnc_data *data = priv;
542 return data->state == DONE || data->state == FAIL;
546 static Boolean eap_tnc_isSuccess(struct eap_sm *sm, void *priv)
548 struct eap_tnc_data *data = priv;
549 return data->state == DONE;
553 int eap_server_tnc_register(void)
555 struct eap_method *eap;
558 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
559 EAP_VENDOR_IETF, EAP_TYPE_TNC, "TNC");
563 eap->init = eap_tnc_init;
564 eap->reset = eap_tnc_reset;
565 eap->buildReq = eap_tnc_buildReq;
566 eap->check = eap_tnc_check;
567 eap->process = eap_tnc_process;
568 eap->isDone = eap_tnc_isDone;
569 eap->isSuccess = eap_tnc_isSuccess;
571 ret = eap_server_method_register(eap);
573 eap_server_method_free(eap);