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;
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;
233 wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
234 "(%lu more to send)", (unsigned long) send_len,
235 (unsigned long) wpabuf_len(data->out_buf) -
237 if (data->state == FAIL)
239 else if (data->state == DONE)
241 data->state = WAIT_FRAG_ACK;
248 static struct wpabuf * eap_tnc_buildReq(struct eap_sm *sm, void *priv, u8 id)
250 struct eap_tnc_data *data = priv;
252 switch (data->state) {
254 tncs_init_connection(data->tncs);
255 return eap_tnc_build_start(sm, data, id);
257 if (data->out_buf == NULL) {
258 data->out_buf = eap_tnc_build(sm, data);
259 if (data->out_buf == NULL) {
260 wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
266 return eap_tnc_build_msg(data, id);
268 if (data->out_buf == NULL) {
269 data->out_buf = eap_tnc_build_recommendation(sm, data);
270 if (data->out_buf == NULL) {
271 wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
272 "generate recommendation message");
277 return eap_tnc_build_msg(data, id);
279 return eap_tnc_build_msg(data, id);
281 return eap_tnc_build_frag_ack(id, EAP_CODE_REQUEST);
291 static Boolean eap_tnc_check(struct eap_sm *sm, void *priv,
292 struct wpabuf *respData)
294 struct eap_tnc_data *data = priv;
298 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData,
301 wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame");
305 if (len == 0 && data->state != WAIT_FRAG_ACK) {
306 wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame (empty)");
311 return FALSE; /* Fragment ACK does not include flags */
313 if ((*pos & EAP_TNC_VERSION_MASK) != EAP_TNC_VERSION) {
314 wpa_printf(MSG_DEBUG, "EAP-TNC: Unsupported version %d",
315 *pos & EAP_TNC_VERSION_MASK);
319 if (*pos & EAP_TNC_FLAGS_START) {
320 wpa_printf(MSG_DEBUG, "EAP-TNC: Peer used Start flag");
328 static void tncs_process(struct eap_tnc_data *data, struct wpabuf *inbuf)
330 enum tncs_process_res res;
332 res = tncs_process_if_tnccs(data->tncs, wpabuf_head(inbuf),
335 case TNCCS_RECOMMENDATION_ALLOW:
336 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS allowed access");
337 data->state = RECOMMENDATION;
338 data->recommendation = ALLOW;
340 case TNCCS_RECOMMENDATION_NO_RECOMMENDATION:
341 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS has no recommendation");
342 data->state = RECOMMENDATION;
343 data->recommendation = NO_RECOMMENDATION;
345 case TNCCS_RECOMMENDATION_ISOLATE:
346 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS requested isolation");
347 data->state = RECOMMENDATION;
348 data->recommendation = ISOLATE;
350 case TNCCS_RECOMMENDATION_NO_ACCESS:
351 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS rejected access");
352 data->state = RECOMMENDATION;
353 data->recommendation = NO_ACCESS;
355 case TNCCS_PROCESS_ERROR:
356 wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS processing error");
365 static int eap_tnc_process_cont(struct eap_tnc_data *data,
366 const u8 *buf, size_t len)
368 /* Process continuation of a pending message */
369 if (len > wpabuf_tailroom(data->in_buf)) {
370 wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment overflow");
375 wpabuf_put_data(data->in_buf, buf, len);
376 wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes, waiting for %lu "
377 "bytes more", (unsigned long) len,
378 (unsigned long) wpabuf_tailroom(data->in_buf));
384 static int eap_tnc_process_fragment(struct eap_tnc_data *data,
385 u8 flags, u32 message_length,
386 const u8 *buf, size_t len)
388 /* Process a fragment that is not the last one of the message */
389 if (data->in_buf == NULL && !(flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)) {
390 wpa_printf(MSG_DEBUG, "EAP-TNC: No Message Length field in a "
391 "fragmented packet");
395 if (data->in_buf == NULL) {
396 /* First fragment of the message */
397 data->in_buf = wpabuf_alloc(message_length);
398 if (data->in_buf == NULL) {
399 wpa_printf(MSG_DEBUG, "EAP-TNC: No memory for "
403 wpabuf_put_data(data->in_buf, buf, len);
404 wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes in first "
405 "fragment, waiting for %lu bytes more",
407 (unsigned long) wpabuf_tailroom(data->in_buf));
414 static void eap_tnc_process(struct eap_sm *sm, void *priv,
415 struct wpabuf *respData)
417 struct eap_tnc_data *data = priv;
421 u32 message_length = 0;
422 struct wpabuf tmpbuf;
424 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData, &len);
426 return; /* Should not happen; message already verified */
430 if (len == 1 && (data->state == DONE || data->state == FAIL)) {
431 wpa_printf(MSG_DEBUG, "EAP-TNC: Peer acknowledged the last "
442 if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED) {
444 wpa_printf(MSG_DEBUG, "EAP-TNC: Message underflow");
448 message_length = WPA_GET_BE32(pos);
451 if (message_length < (u32) (end - pos)) {
452 wpa_printf(MSG_DEBUG, "EAP-TNC: Invalid Message "
453 "Length (%d; %ld remaining in this msg)",
454 message_length, (long) (end - pos));
459 wpa_printf(MSG_DEBUG, "EAP-TNC: Received packet: Flags 0x%x "
460 "Message Length %u", flags, message_length);
462 if (data->state == WAIT_FRAG_ACK) {
464 wpa_printf(MSG_DEBUG, "EAP-TNC: Unexpected payload "
465 "in WAIT_FRAG_ACK state");
469 wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment acknowledged");
472 else if (data->was_done)
475 data->state = CONTINUE;
479 if (data->in_buf && eap_tnc_process_cont(data, pos, end - pos) < 0) {
484 if (flags & EAP_TNC_FLAGS_MORE_FRAGMENTS) {
485 if (eap_tnc_process_fragment(data, flags, message_length,
489 data->state = FRAG_ACK;
491 } else if (data->state == FRAG_ACK) {
492 wpa_printf(MSG_DEBUG, "EAP-TNC: All fragments received");
493 data->state = CONTINUE;
496 if (data->in_buf == NULL) {
497 /* Wrap unfragmented messages as wpabuf without extra copy */
498 wpabuf_set(&tmpbuf, pos, end - pos);
499 data->in_buf = &tmpbuf;
502 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Received payload",
503 wpabuf_head(data->in_buf), wpabuf_len(data->in_buf));
504 tncs_process(data, data->in_buf);
506 if (data->in_buf != &tmpbuf)
507 wpabuf_free(data->in_buf);
512 static Boolean eap_tnc_isDone(struct eap_sm *sm, void *priv)
514 struct eap_tnc_data *data = priv;
515 return data->state == DONE || data->state == FAIL;
519 static Boolean eap_tnc_isSuccess(struct eap_sm *sm, void *priv)
521 struct eap_tnc_data *data = priv;
522 return data->state == DONE;
526 int eap_server_tnc_register(void)
528 struct eap_method *eap;
531 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
532 EAP_VENDOR_IETF, EAP_TYPE_TNC, "TNC");
536 eap->init = eap_tnc_init;
537 eap->reset = eap_tnc_reset;
538 eap->buildReq = eap_tnc_buildReq;
539 eap->check = eap_tnc_check;
540 eap->process = eap_tnc_process;
541 eap->isDone = eap_tnc_isDone;
542 eap->isSuccess = eap_tnc_isSuccess;
544 ret = eap_server_method_register(eap);
546 eap_server_method_free(eap);