2 * EAP server method: EAP-TNC (Trusted Network Connect)
3 * Copyright (c) 2007-2010, 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.
25 START, CONTINUE, RECOMMENDATION, FRAG_ACK, WAIT_FRAG_ACK, DONE,
28 enum { ALLOW, ISOLATE, NO_ACCESS, NO_RECOMMENDATION } recommendation;
29 struct tncs_data *tncs;
30 struct wpabuf *in_buf;
31 struct wpabuf *out_buf;
34 unsigned int was_done:1;
35 unsigned int was_fail:1;
40 #define EAP_TNC_FLAGS_LENGTH_INCLUDED 0x80
41 #define EAP_TNC_FLAGS_MORE_FRAGMENTS 0x40
42 #define EAP_TNC_FLAGS_START 0x20
43 #define EAP_TNC_VERSION_MASK 0x07
45 #define EAP_TNC_VERSION 1
48 static const char * eap_tnc_state_txt(enum eap_tnc_state state)
56 return "RECOMMENDATION";
60 return "WAIT_FRAG_ACK";
70 static void eap_tnc_set_state(struct eap_tnc_data *data,
71 enum eap_tnc_state new_state)
73 wpa_printf(MSG_DEBUG, "EAP-TNC: %s -> %s",
74 eap_tnc_state_txt(data->state),
75 eap_tnc_state_txt(new_state));
76 data->state = new_state;
80 static void * eap_tnc_init(struct eap_sm *sm)
82 struct eap_tnc_data *data;
84 data = os_zalloc(sizeof(*data));
87 eap_tnc_set_state(data, START);
88 data->tncs = tncs_init();
89 if (data->tncs == NULL) {
94 data->fragment_size = 1300;
100 static void eap_tnc_reset(struct eap_sm *sm, void *priv)
102 struct eap_tnc_data *data = priv;
103 wpabuf_free(data->in_buf);
104 wpabuf_free(data->out_buf);
105 tncs_deinit(data->tncs);
110 static struct wpabuf * eap_tnc_build_start(struct eap_sm *sm,
111 struct eap_tnc_data *data, u8 id)
115 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, EAP_CODE_REQUEST,
118 wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory for "
120 eap_tnc_set_state(data, FAIL);
124 wpabuf_put_u8(req, EAP_TNC_FLAGS_START | EAP_TNC_VERSION);
126 eap_tnc_set_state(data, CONTINUE);
132 static struct wpabuf * eap_tnc_build(struct eap_sm *sm,
133 struct eap_tnc_data *data)
138 char *start_buf, *end_buf;
139 size_t start_len, end_len;
142 imv_len = tncs_total_send_len(data->tncs);
144 start_buf = tncs_if_tnccs_start(data->tncs);
145 if (start_buf == NULL)
147 start_len = os_strlen(start_buf);
148 end_buf = tncs_if_tnccs_end();
149 if (end_buf == NULL) {
153 end_len = os_strlen(end_buf);
155 rlen = start_len + imv_len + end_len;
156 req = wpabuf_alloc(rlen);
163 wpabuf_put_data(req, start_buf, start_len);
166 rpos1 = wpabuf_put(req, 0);
167 rpos = tncs_copy_send_buf(data->tncs, rpos1);
168 wpabuf_put(req, rpos - rpos1);
170 wpabuf_put_data(req, end_buf, end_len);
173 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Request",
174 wpabuf_head(req), wpabuf_len(req));
180 static struct wpabuf * eap_tnc_build_recommendation(struct eap_sm *sm,
181 struct eap_tnc_data *data)
183 switch (data->recommendation) {
185 eap_tnc_set_state(data, DONE);
188 eap_tnc_set_state(data, FAIL);
189 /* TODO: support assignment to a different VLAN */
192 eap_tnc_set_state(data, FAIL);
194 case NO_RECOMMENDATION:
195 eap_tnc_set_state(data, DONE);
198 wpa_printf(MSG_DEBUG, "EAP-TNC: Unknown recommendation");
202 return eap_tnc_build(sm, data);
206 static struct wpabuf * eap_tnc_build_frag_ack(u8 id, u8 code)
210 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, code, id);
212 wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory "
216 wpabuf_put_u8(msg, EAP_TNC_VERSION); /* Flags */
218 wpa_printf(MSG_DEBUG, "EAP-TNC: Send fragment ack");
224 static struct wpabuf * eap_tnc_build_msg(struct eap_tnc_data *data, u8 id)
228 size_t send_len, plen;
230 wpa_printf(MSG_DEBUG, "EAP-TNC: Generating Request");
232 flags = EAP_TNC_VERSION;
233 send_len = wpabuf_len(data->out_buf) - data->out_used;
234 if (1 + send_len > data->fragment_size) {
235 send_len = data->fragment_size - 1;
236 flags |= EAP_TNC_FLAGS_MORE_FRAGMENTS;
237 if (data->out_used == 0) {
238 flags |= EAP_TNC_FLAGS_LENGTH_INCLUDED;
244 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
246 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, plen,
247 EAP_CODE_REQUEST, id);
251 wpabuf_put_u8(req, flags); /* Flags */
252 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
253 wpabuf_put_be32(req, wpabuf_len(data->out_buf));
255 wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
257 data->out_used += send_len;
259 if (data->out_used == wpabuf_len(data->out_buf)) {
260 wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
261 "(message sent completely)",
262 (unsigned long) send_len);
263 wpabuf_free(data->out_buf);
264 data->out_buf = NULL;
267 eap_tnc_set_state(data, FAIL);
268 else if (data->was_done)
269 eap_tnc_set_state(data, DONE);
271 wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
272 "(%lu more to send)", (unsigned long) send_len,
273 (unsigned long) wpabuf_len(data->out_buf) -
275 if (data->state == FAIL)
277 else if (data->state == DONE)
279 eap_tnc_set_state(data, WAIT_FRAG_ACK);
286 static struct wpabuf * eap_tnc_buildReq(struct eap_sm *sm, void *priv, u8 id)
288 struct eap_tnc_data *data = priv;
290 switch (data->state) {
292 tncs_init_connection(data->tncs);
293 return eap_tnc_build_start(sm, data, id);
295 if (data->out_buf == NULL) {
296 data->out_buf = eap_tnc_build(sm, data);
297 if (data->out_buf == NULL) {
298 wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
304 return eap_tnc_build_msg(data, id);
306 if (data->out_buf == NULL) {
307 data->out_buf = eap_tnc_build_recommendation(sm, data);
308 if (data->out_buf == NULL) {
309 wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
310 "generate recommendation message");
315 return eap_tnc_build_msg(data, id);
317 return eap_tnc_build_msg(data, id);
319 return eap_tnc_build_frag_ack(id, EAP_CODE_REQUEST);
329 static Boolean eap_tnc_check(struct eap_sm *sm, void *priv,
330 struct wpabuf *respData)
332 struct eap_tnc_data *data = priv;
336 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData,
339 wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame");
343 if (len == 0 && data->state != WAIT_FRAG_ACK) {
344 wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame (empty)");
349 return FALSE; /* Fragment ACK does not include flags */
351 if ((*pos & EAP_TNC_VERSION_MASK) != EAP_TNC_VERSION) {
352 wpa_printf(MSG_DEBUG, "EAP-TNC: Unsupported version %d",
353 *pos & EAP_TNC_VERSION_MASK);
357 if (*pos & EAP_TNC_FLAGS_START) {
358 wpa_printf(MSG_DEBUG, "EAP-TNC: Peer used Start flag");
366 static void tncs_process(struct eap_tnc_data *data, struct wpabuf *inbuf)
368 enum tncs_process_res res;
370 res = tncs_process_if_tnccs(data->tncs, wpabuf_head(inbuf),
373 case TNCCS_RECOMMENDATION_ALLOW:
374 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS allowed access");
375 eap_tnc_set_state(data, RECOMMENDATION);
376 data->recommendation = ALLOW;
378 case TNCCS_RECOMMENDATION_NO_RECOMMENDATION:
379 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS has no recommendation");
380 eap_tnc_set_state(data, RECOMMENDATION);
381 data->recommendation = NO_RECOMMENDATION;
383 case TNCCS_RECOMMENDATION_ISOLATE:
384 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS requested isolation");
385 eap_tnc_set_state(data, RECOMMENDATION);
386 data->recommendation = ISOLATE;
388 case TNCCS_RECOMMENDATION_NO_ACCESS:
389 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS rejected access");
390 eap_tnc_set_state(data, RECOMMENDATION);
391 data->recommendation = NO_ACCESS;
393 case TNCCS_PROCESS_ERROR:
394 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS processing error");
395 eap_tnc_set_state(data, FAIL);
403 static int eap_tnc_process_cont(struct eap_tnc_data *data,
404 const u8 *buf, size_t len)
406 /* Process continuation of a pending message */
407 if (len > wpabuf_tailroom(data->in_buf)) {
408 wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment overflow");
409 eap_tnc_set_state(data, FAIL);
413 wpabuf_put_data(data->in_buf, buf, len);
414 wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes, waiting for %lu "
415 "bytes more", (unsigned long) len,
416 (unsigned long) wpabuf_tailroom(data->in_buf));
422 static int eap_tnc_process_fragment(struct eap_tnc_data *data,
423 u8 flags, u32 message_length,
424 const u8 *buf, size_t len)
426 /* Process a fragment that is not the last one of the message */
427 if (data->in_buf == NULL && !(flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)) {
428 wpa_printf(MSG_DEBUG, "EAP-TNC: No Message Length field in a "
429 "fragmented packet");
433 if (data->in_buf == NULL) {
434 /* First fragment of the message */
435 data->in_buf = wpabuf_alloc(message_length);
436 if (data->in_buf == NULL) {
437 wpa_printf(MSG_DEBUG, "EAP-TNC: No memory for "
441 wpabuf_put_data(data->in_buf, buf, len);
442 wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes in first "
443 "fragment, waiting for %lu bytes more",
445 (unsigned long) wpabuf_tailroom(data->in_buf));
452 static void eap_tnc_process(struct eap_sm *sm, void *priv,
453 struct wpabuf *respData)
455 struct eap_tnc_data *data = priv;
459 u32 message_length = 0;
460 struct wpabuf tmpbuf;
462 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData, &len);
464 return; /* Should not happen; message already verified */
468 if (len == 1 && (data->state == DONE || data->state == FAIL)) {
469 wpa_printf(MSG_DEBUG, "EAP-TNC: Peer acknowledged the last "
480 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED) {
482 wpa_printf(MSG_DEBUG, "EAP-TNC: Message underflow");
483 eap_tnc_set_state(data, FAIL);
486 message_length = WPA_GET_BE32(pos);
489 if (message_length < (u32) (end - pos)) {
490 wpa_printf(MSG_DEBUG, "EAP-TNC: Invalid Message "
491 "Length (%d; %ld remaining in this msg)",
492 message_length, (long) (end - pos));
493 eap_tnc_set_state(data, FAIL);
497 wpa_printf(MSG_DEBUG, "EAP-TNC: Received packet: Flags 0x%x "
498 "Message Length %u", flags, message_length);
500 if (data->state == WAIT_FRAG_ACK) {
502 wpa_printf(MSG_DEBUG, "EAP-TNC: Unexpected payload "
503 "in WAIT_FRAG_ACK state");
504 eap_tnc_set_state(data, FAIL);
507 wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment acknowledged");
508 eap_tnc_set_state(data, CONTINUE);
512 if (data->in_buf && eap_tnc_process_cont(data, pos, end - pos) < 0) {
513 eap_tnc_set_state(data, FAIL);
517 if (flags & EAP_TNC_FLAGS_MORE_FRAGMENTS) {
518 if (eap_tnc_process_fragment(data, flags, message_length,
520 eap_tnc_set_state(data, FAIL);
522 eap_tnc_set_state(data, FRAG_ACK);
524 } else if (data->state == FRAG_ACK) {
525 wpa_printf(MSG_DEBUG, "EAP-TNC: All fragments received");
526 eap_tnc_set_state(data, CONTINUE);
529 if (data->in_buf == NULL) {
530 /* Wrap unfragmented messages as wpabuf without extra copy */
531 wpabuf_set(&tmpbuf, pos, end - pos);
532 data->in_buf = &tmpbuf;
535 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Received payload",
536 wpabuf_head(data->in_buf), wpabuf_len(data->in_buf));
537 tncs_process(data, data->in_buf);
539 if (data->in_buf != &tmpbuf)
540 wpabuf_free(data->in_buf);
545 static Boolean eap_tnc_isDone(struct eap_sm *sm, void *priv)
547 struct eap_tnc_data *data = priv;
548 return data->state == DONE || data->state == FAIL;
552 static Boolean eap_tnc_isSuccess(struct eap_sm *sm, void *priv)
554 struct eap_tnc_data *data = priv;
555 return data->state == DONE;
559 int eap_server_tnc_register(void)
561 struct eap_method *eap;
564 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
565 EAP_VENDOR_IETF, EAP_TYPE_TNC, "TNC");
569 eap->init = eap_tnc_init;
570 eap->reset = eap_tnc_reset;
571 eap->buildReq = eap_tnc_buildReq;
572 eap->check = eap_tnc_check;
573 eap->process = eap_tnc_process;
574 eap->isDone = eap_tnc_isDone;
575 eap->isSuccess = eap_tnc_isSuccess;
577 ret = eap_server_method_register(eap);
579 eap_server_method_free(eap);