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.
24 enum { START, CONTINUE, RECOMMENDATION, FRAG_ACK, WAIT_FRAG_ACK, DONE,
26 enum { ALLOW, ISOLATE, NO_ACCESS, NO_RECOMMENDATION } recommendation;
27 struct tncs_data *tncs;
28 struct wpabuf *in_buf;
29 struct wpabuf *out_buf;
32 unsigned int was_done:1;
33 unsigned int was_fail:1;
38 #define EAP_TNC_FLAGS_LENGTH_INCLUDED 0x80
39 #define EAP_TNC_FLAGS_MORE_FRAGMENTS 0x40
40 #define EAP_TNC_FLAGS_START 0x20
41 #define EAP_TNC_VERSION_MASK 0x07
43 #define EAP_TNC_VERSION 1
46 static void * eap_tnc_init(struct eap_sm *sm)
48 struct eap_tnc_data *data;
50 data = os_zalloc(sizeof(*data));
54 data->tncs = tncs_init();
55 if (data->tncs == NULL) {
60 data->fragment_size = 1300;
66 static void eap_tnc_reset(struct eap_sm *sm, void *priv)
68 struct eap_tnc_data *data = priv;
69 wpabuf_free(data->in_buf);
70 wpabuf_free(data->out_buf);
71 tncs_deinit(data->tncs);
76 static struct wpabuf * eap_tnc_build_start(struct eap_sm *sm,
77 struct eap_tnc_data *data, u8 id)
81 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, EAP_CODE_REQUEST,
84 wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory for "
90 wpabuf_put_u8(req, EAP_TNC_FLAGS_START | EAP_TNC_VERSION);
92 data->state = CONTINUE;
98 static struct wpabuf * eap_tnc_build(struct eap_sm *sm,
99 struct eap_tnc_data *data)
104 char *start_buf, *end_buf;
105 size_t start_len, end_len;
108 imv_len = tncs_total_send_len(data->tncs);
110 start_buf = tncs_if_tnccs_start(data->tncs);
111 if (start_buf == NULL)
113 start_len = os_strlen(start_buf);
114 end_buf = tncs_if_tnccs_end();
115 if (end_buf == NULL) {
119 end_len = os_strlen(end_buf);
121 rlen = start_len + imv_len + end_len;
122 req = wpabuf_alloc(rlen);
129 wpabuf_put_data(req, start_buf, start_len);
132 rpos1 = wpabuf_put(req, 0);
133 rpos = tncs_copy_send_buf(data->tncs, rpos1);
134 wpabuf_put(req, rpos - rpos1);
136 wpabuf_put_data(req, end_buf, end_len);
139 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Request",
140 wpabuf_head(req), wpabuf_len(req));
146 static struct wpabuf * eap_tnc_build_recommendation(struct eap_sm *sm,
147 struct eap_tnc_data *data)
149 switch (data->recommendation) {
155 /* TODO: support assignment to a different VLAN */
160 case NO_RECOMMENDATION:
164 wpa_printf(MSG_DEBUG, "EAP-TNC: Unknown recommendation");
168 return eap_tnc_build(sm, data);
172 static struct wpabuf * eap_tnc_build_frag_ack(u8 id, u8 code)
176 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, code, id);
178 wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory "
182 wpabuf_put_u8(msg, EAP_TNC_VERSION); /* Flags */
184 wpa_printf(MSG_DEBUG, "EAP-TNC: Send fragment ack");
190 static struct wpabuf * eap_tnc_build_msg(struct eap_tnc_data *data, u8 id)
194 size_t send_len, plen;
196 wpa_printf(MSG_DEBUG, "EAP-TNC: Generating Request");
198 flags = EAP_TNC_VERSION;
199 send_len = wpabuf_len(data->out_buf) - data->out_used;
200 if (1 + send_len > data->fragment_size) {
201 send_len = data->fragment_size - 1;
202 flags |= EAP_TNC_FLAGS_MORE_FRAGMENTS;
203 if (data->out_used == 0) {
204 flags |= EAP_TNC_FLAGS_LENGTH_INCLUDED;
210 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
212 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, plen,
213 EAP_CODE_REQUEST, id);
217 wpabuf_put_u8(req, flags); /* Flags */
218 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
219 wpabuf_put_be32(req, wpabuf_len(data->out_buf));
221 wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
223 data->out_used += send_len;
225 if (data->out_used == wpabuf_len(data->out_buf)) {
226 wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
227 "(message sent completely)",
228 (unsigned long) send_len);
229 wpabuf_free(data->out_buf);
230 data->out_buf = NULL;
234 else if (data->was_done)
237 wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
238 "(%lu more to send)", (unsigned long) send_len,
239 (unsigned long) wpabuf_len(data->out_buf) -
241 if (data->state == FAIL)
243 else if (data->state == DONE)
245 data->state = WAIT_FRAG_ACK;
252 static struct wpabuf * eap_tnc_buildReq(struct eap_sm *sm, void *priv, u8 id)
254 struct eap_tnc_data *data = priv;
256 switch (data->state) {
258 tncs_init_connection(data->tncs);
259 return eap_tnc_build_start(sm, data, id);
261 if (data->out_buf == NULL) {
262 data->out_buf = eap_tnc_build(sm, data);
263 if (data->out_buf == NULL) {
264 wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
270 return eap_tnc_build_msg(data, id);
272 if (data->out_buf == NULL) {
273 data->out_buf = eap_tnc_build_recommendation(sm, data);
274 if (data->out_buf == NULL) {
275 wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
276 "generate recommendation message");
281 return eap_tnc_build_msg(data, id);
283 return eap_tnc_build_msg(data, id);
285 return eap_tnc_build_frag_ack(id, EAP_CODE_REQUEST);
295 static Boolean eap_tnc_check(struct eap_sm *sm, void *priv,
296 struct wpabuf *respData)
298 struct eap_tnc_data *data = priv;
302 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData,
305 wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame");
309 if (len == 0 && data->state != WAIT_FRAG_ACK) {
310 wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame (empty)");
315 return FALSE; /* Fragment ACK does not include flags */
317 if ((*pos & EAP_TNC_VERSION_MASK) != EAP_TNC_VERSION) {
318 wpa_printf(MSG_DEBUG, "EAP-TNC: Unsupported version %d",
319 *pos & EAP_TNC_VERSION_MASK);
323 if (*pos & EAP_TNC_FLAGS_START) {
324 wpa_printf(MSG_DEBUG, "EAP-TNC: Peer used Start flag");
332 static void tncs_process(struct eap_tnc_data *data, struct wpabuf *inbuf)
334 enum tncs_process_res res;
336 res = tncs_process_if_tnccs(data->tncs, wpabuf_head(inbuf),
339 case TNCCS_RECOMMENDATION_ALLOW:
340 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS allowed access");
341 data->state = RECOMMENDATION;
342 data->recommendation = ALLOW;
344 case TNCCS_RECOMMENDATION_NO_RECOMMENDATION:
345 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS has no recommendation");
346 data->state = RECOMMENDATION;
347 data->recommendation = NO_RECOMMENDATION;
349 case TNCCS_RECOMMENDATION_ISOLATE:
350 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS requested isolation");
351 data->state = RECOMMENDATION;
352 data->recommendation = ISOLATE;
354 case TNCCS_RECOMMENDATION_NO_ACCESS:
355 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS rejected access");
356 data->state = RECOMMENDATION;
357 data->recommendation = NO_ACCESS;
359 case TNCCS_PROCESS_ERROR:
360 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS processing error");
369 static int eap_tnc_process_cont(struct eap_tnc_data *data,
370 const u8 *buf, size_t len)
372 /* Process continuation of a pending message */
373 if (len > wpabuf_tailroom(data->in_buf)) {
374 wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment overflow");
379 wpabuf_put_data(data->in_buf, buf, len);
380 wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes, waiting for %lu "
381 "bytes more", (unsigned long) len,
382 (unsigned long) wpabuf_tailroom(data->in_buf));
388 static int eap_tnc_process_fragment(struct eap_tnc_data *data,
389 u8 flags, u32 message_length,
390 const u8 *buf, size_t len)
392 /* Process a fragment that is not the last one of the message */
393 if (data->in_buf == NULL && !(flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)) {
394 wpa_printf(MSG_DEBUG, "EAP-TNC: No Message Length field in a "
395 "fragmented packet");
399 if (data->in_buf == NULL) {
400 /* First fragment of the message */
401 data->in_buf = wpabuf_alloc(message_length);
402 if (data->in_buf == NULL) {
403 wpa_printf(MSG_DEBUG, "EAP-TNC: No memory for "
407 wpabuf_put_data(data->in_buf, buf, len);
408 wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes in first "
409 "fragment, waiting for %lu bytes more",
411 (unsigned long) wpabuf_tailroom(data->in_buf));
418 static void eap_tnc_process(struct eap_sm *sm, void *priv,
419 struct wpabuf *respData)
421 struct eap_tnc_data *data = priv;
425 u32 message_length = 0;
426 struct wpabuf tmpbuf;
428 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData, &len);
430 return; /* Should not happen; message already verified */
434 if (len == 1 && (data->state == DONE || data->state == FAIL)) {
435 wpa_printf(MSG_DEBUG, "EAP-TNC: Peer acknowledged the last "
446 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED) {
448 wpa_printf(MSG_DEBUG, "EAP-TNC: Message underflow");
452 message_length = WPA_GET_BE32(pos);
455 if (message_length < (u32) (end - pos)) {
456 wpa_printf(MSG_DEBUG, "EAP-TNC: Invalid Message "
457 "Length (%d; %ld remaining in this msg)",
458 message_length, (long) (end - pos));
463 wpa_printf(MSG_DEBUG, "EAP-TNC: Received packet: Flags 0x%x "
464 "Message Length %u", flags, message_length);
466 if (data->state == WAIT_FRAG_ACK) {
468 wpa_printf(MSG_DEBUG, "EAP-TNC: Unexpected payload "
469 "in WAIT_FRAG_ACK state");
473 wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment acknowledged");
474 data->state = CONTINUE;
478 if (data->in_buf && eap_tnc_process_cont(data, pos, end - pos) < 0) {
483 if (flags & EAP_TNC_FLAGS_MORE_FRAGMENTS) {
484 if (eap_tnc_process_fragment(data, flags, message_length,
488 data->state = FRAG_ACK;
490 } else if (data->state == FRAG_ACK) {
491 wpa_printf(MSG_DEBUG, "EAP-TNC: All fragments received");
492 data->state = CONTINUE;
495 if (data->in_buf == NULL) {
496 /* Wrap unfragmented messages as wpabuf without extra copy */
497 wpabuf_set(&tmpbuf, pos, end - pos);
498 data->in_buf = &tmpbuf;
501 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Received payload",
502 wpabuf_head(data->in_buf), wpabuf_len(data->in_buf));
503 tncs_process(data, data->in_buf);
505 if (data->in_buf != &tmpbuf)
506 wpabuf_free(data->in_buf);
511 static Boolean eap_tnc_isDone(struct eap_sm *sm, void *priv)
513 struct eap_tnc_data *data = priv;
514 return data->state == DONE || data->state == FAIL;
518 static Boolean eap_tnc_isSuccess(struct eap_sm *sm, void *priv)
520 struct eap_tnc_data *data = priv;
521 return data->state == DONE;
525 int eap_server_tnc_register(void)
527 struct eap_method *eap;
530 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
531 EAP_VENDOR_IETF, EAP_TYPE_TNC, "TNC");
535 eap->init = eap_tnc_init;
536 eap->reset = eap_tnc_reset;
537 eap->buildReq = eap_tnc_buildReq;
538 eap->check = eap_tnc_check;
539 eap->process = eap_tnc_process;
540 eap->isDone = eap_tnc_isDone;
541 eap->isSuccess = eap_tnc_isSuccess;
543 ret = eap_server_method_register(eap);
545 eap_server_method_free(eap);