+++ /dev/null
-/*
- * EAP server method: EAP-TNC (Trusted Network Connect)
- * Copyright (c) 2007-2010, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
-
-#include "includes.h"
-
-#include "common.h"
-#include "base64.h"
-#include "eap_i.h"
-#include "tncs.h"
-
-
-struct eap_tnc_data {
- enum eap_tnc_state {
- START, CONTINUE, RECOMMENDATION, FRAG_ACK, WAIT_FRAG_ACK, DONE,
- FAIL
- } state;
- enum { ALLOW, ISOLATE, NO_ACCESS, NO_RECOMMENDATION } recommendation;
- struct tncs_data *tncs;
- struct wpabuf *in_buf;
- struct wpabuf *out_buf;
- size_t out_used;
- size_t fragment_size;
- unsigned int was_done:1;
- unsigned int was_fail:1;
-};
-
-
-/* EAP-TNC Flags */
-#define EAP_TNC_FLAGS_LENGTH_INCLUDED 0x80
-#define EAP_TNC_FLAGS_MORE_FRAGMENTS 0x40
-#define EAP_TNC_FLAGS_START 0x20
-#define EAP_TNC_VERSION_MASK 0x07
-
-#define EAP_TNC_VERSION 1
-
-
-static const char * eap_tnc_state_txt(enum eap_tnc_state state)
-{
- switch (state) {
- case START:
- return "START";
- case CONTINUE:
- return "CONTINUE";
- case RECOMMENDATION:
- return "RECOMMENDATION";
- case FRAG_ACK:
- return "FRAG_ACK";
- case WAIT_FRAG_ACK:
- return "WAIT_FRAG_ACK";
- case DONE:
- return "DONE";
- case FAIL:
- return "FAIL";
- }
- return "??";
-}
-
-
-static void eap_tnc_set_state(struct eap_tnc_data *data,
- enum eap_tnc_state new_state)
-{
- wpa_printf(MSG_DEBUG, "EAP-TNC: %s -> %s",
- eap_tnc_state_txt(data->state),
- eap_tnc_state_txt(new_state));
- data->state = new_state;
-}
-
-
-static void * eap_tnc_init(struct eap_sm *sm)
-{
- struct eap_tnc_data *data;
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
- eap_tnc_set_state(data, START);
- data->tncs = tncs_init();
- if (data->tncs == NULL) {
- os_free(data);
- return NULL;
- }
-
- data->fragment_size = sm->fragment_size > 100 ?
- sm->fragment_size - 98 : 1300;
-
- return data;
-}
-
-
-static void eap_tnc_reset(struct eap_sm *sm, void *priv)
-{
- struct eap_tnc_data *data = priv;
- wpabuf_free(data->in_buf);
- wpabuf_free(data->out_buf);
- tncs_deinit(data->tncs);
- os_free(data);
-}
-
-
-static struct wpabuf * eap_tnc_build_start(struct eap_sm *sm,
- struct eap_tnc_data *data, u8 id)
-{
- struct wpabuf *req;
-
- req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, EAP_CODE_REQUEST,
- id);
- if (req == NULL) {
- wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory for "
- "request");
- eap_tnc_set_state(data, FAIL);
- return NULL;
- }
-
- wpabuf_put_u8(req, EAP_TNC_FLAGS_START | EAP_TNC_VERSION);
-
- eap_tnc_set_state(data, CONTINUE);
-
- return req;
-}
-
-
-static struct wpabuf * eap_tnc_build(struct eap_sm *sm,
- struct eap_tnc_data *data)
-{
- struct wpabuf *req;
- u8 *rpos, *rpos1;
- size_t rlen;
- char *start_buf, *end_buf;
- size_t start_len, end_len;
- size_t imv_len;
-
- imv_len = tncs_total_send_len(data->tncs);
-
- start_buf = tncs_if_tnccs_start(data->tncs);
- if (start_buf == NULL)
- return NULL;
- start_len = os_strlen(start_buf);
- end_buf = tncs_if_tnccs_end();
- if (end_buf == NULL) {
- os_free(start_buf);
- return NULL;
- }
- end_len = os_strlen(end_buf);
-
- rlen = start_len + imv_len + end_len;
- req = wpabuf_alloc(rlen);
- if (req == NULL) {
- os_free(start_buf);
- os_free(end_buf);
- return NULL;
- }
-
- wpabuf_put_data(req, start_buf, start_len);
- os_free(start_buf);
-
- rpos1 = wpabuf_put(req, 0);
- rpos = tncs_copy_send_buf(data->tncs, rpos1);
- wpabuf_put(req, rpos - rpos1);
-
- wpabuf_put_data(req, end_buf, end_len);
- os_free(end_buf);
-
- wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Request",
- wpabuf_head(req), wpabuf_len(req));
-
- return req;
-}
-
-
-static struct wpabuf * eap_tnc_build_recommendation(struct eap_sm *sm,
- struct eap_tnc_data *data)
-{
- switch (data->recommendation) {
- case ALLOW:
- eap_tnc_set_state(data, DONE);
- break;
- case ISOLATE:
- eap_tnc_set_state(data, FAIL);
- /* TODO: support assignment to a different VLAN */
- break;
- case NO_ACCESS:
- eap_tnc_set_state(data, FAIL);
- break;
- case NO_RECOMMENDATION:
- eap_tnc_set_state(data, DONE);
- break;
- default:
- wpa_printf(MSG_DEBUG, "EAP-TNC: Unknown recommendation");
- return NULL;
- }
-
- return eap_tnc_build(sm, data);
-}
-
-
-static struct wpabuf * eap_tnc_build_frag_ack(u8 id, u8 code)
-{
- struct wpabuf *msg;
-
- msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, 1, code, id);
- if (msg == NULL) {
- wpa_printf(MSG_ERROR, "EAP-TNC: Failed to allocate memory "
- "for fragment ack");
- return NULL;
- }
- wpabuf_put_u8(msg, EAP_TNC_VERSION); /* Flags */
-
- wpa_printf(MSG_DEBUG, "EAP-TNC: Send fragment ack");
-
- return msg;
-}
-
-
-static struct wpabuf * eap_tnc_build_msg(struct eap_tnc_data *data, u8 id)
-{
- struct wpabuf *req;
- u8 flags;
- size_t send_len, plen;
-
- wpa_printf(MSG_DEBUG, "EAP-TNC: Generating Request");
-
- flags = EAP_TNC_VERSION;
- send_len = wpabuf_len(data->out_buf) - data->out_used;
- if (1 + send_len > data->fragment_size) {
- send_len = data->fragment_size - 1;
- flags |= EAP_TNC_FLAGS_MORE_FRAGMENTS;
- if (data->out_used == 0) {
- flags |= EAP_TNC_FLAGS_LENGTH_INCLUDED;
- send_len -= 4;
- }
- }
-
- plen = 1 + send_len;
- if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
- plen += 4;
- req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TNC, plen,
- EAP_CODE_REQUEST, id);
- if (req == NULL)
- return NULL;
-
- wpabuf_put_u8(req, flags); /* Flags */
- if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)
- wpabuf_put_be32(req, wpabuf_len(data->out_buf));
-
- wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
- send_len);
- data->out_used += send_len;
-
- if (data->out_used == wpabuf_len(data->out_buf)) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
- "(message sent completely)",
- (unsigned long) send_len);
- wpabuf_free(data->out_buf);
- data->out_buf = NULL;
- data->out_used = 0;
- if (data->was_fail)
- eap_tnc_set_state(data, FAIL);
- else if (data->was_done)
- eap_tnc_set_state(data, DONE);
- } else {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Sending out %lu bytes "
- "(%lu more to send)", (unsigned long) send_len,
- (unsigned long) wpabuf_len(data->out_buf) -
- data->out_used);
- if (data->state == FAIL)
- data->was_fail = 1;
- else if (data->state == DONE)
- data->was_done = 1;
- eap_tnc_set_state(data, WAIT_FRAG_ACK);
- }
-
- return req;
-}
-
-
-static struct wpabuf * eap_tnc_buildReq(struct eap_sm *sm, void *priv, u8 id)
-{
- struct eap_tnc_data *data = priv;
-
- switch (data->state) {
- case START:
- tncs_init_connection(data->tncs);
- return eap_tnc_build_start(sm, data, id);
- case CONTINUE:
- if (data->out_buf == NULL) {
- data->out_buf = eap_tnc_build(sm, data);
- if (data->out_buf == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
- "generate message");
- return NULL;
- }
- data->out_used = 0;
- }
- return eap_tnc_build_msg(data, id);
- case RECOMMENDATION:
- if (data->out_buf == NULL) {
- data->out_buf = eap_tnc_build_recommendation(sm, data);
- if (data->out_buf == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Failed to "
- "generate recommendation message");
- return NULL;
- }
- data->out_used = 0;
- }
- return eap_tnc_build_msg(data, id);
- case WAIT_FRAG_ACK:
- return eap_tnc_build_msg(data, id);
- case FRAG_ACK:
- return eap_tnc_build_frag_ack(id, EAP_CODE_REQUEST);
- case DONE:
- case FAIL:
- return NULL;
- }
-
- return NULL;
-}
-
-
-static Boolean eap_tnc_check(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- struct eap_tnc_data *data = priv;
- const u8 *pos;
- size_t len;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData,
- &len);
- if (pos == NULL) {
- wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame");
- return TRUE;
- }
-
- if (len == 0 && data->state != WAIT_FRAG_ACK) {
- wpa_printf(MSG_INFO, "EAP-TNC: Invalid frame (empty)");
- return TRUE;
- }
-
- if (len == 0)
- return FALSE; /* Fragment ACK does not include flags */
-
- if ((*pos & EAP_TNC_VERSION_MASK) != EAP_TNC_VERSION) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Unsupported version %d",
- *pos & EAP_TNC_VERSION_MASK);
- return TRUE;
- }
-
- if (*pos & EAP_TNC_FLAGS_START) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Peer used Start flag");
- return TRUE;
- }
-
- return FALSE;
-}
-
-
-static void tncs_process(struct eap_tnc_data *data, struct wpabuf *inbuf)
-{
- enum tncs_process_res res;
-
- res = tncs_process_if_tnccs(data->tncs, wpabuf_head(inbuf),
- wpabuf_len(inbuf));
- switch (res) {
- case TNCCS_RECOMMENDATION_ALLOW:
- wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS allowed access");
- eap_tnc_set_state(data, RECOMMENDATION);
- data->recommendation = ALLOW;
- break;
- case TNCCS_RECOMMENDATION_NO_RECOMMENDATION:
- wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS has no recommendation");
- eap_tnc_set_state(data, RECOMMENDATION);
- data->recommendation = NO_RECOMMENDATION;
- break;
- case TNCCS_RECOMMENDATION_ISOLATE:
- wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS requested isolation");
- eap_tnc_set_state(data, RECOMMENDATION);
- data->recommendation = ISOLATE;
- break;
- case TNCCS_RECOMMENDATION_NO_ACCESS:
- wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS rejected access");
- eap_tnc_set_state(data, RECOMMENDATION);
- data->recommendation = NO_ACCESS;
- break;
- case TNCCS_PROCESS_ERROR:
- wpa_printf(MSG_DEBUG, "EAP-TNC: TNCS processing error");
- eap_tnc_set_state(data, FAIL);
- break;
- default:
- break;
- }
-}
-
-
-static int eap_tnc_process_cont(struct eap_tnc_data *data,
- const u8 *buf, size_t len)
-{
- /* Process continuation of a pending message */
- if (len > wpabuf_tailroom(data->in_buf)) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment overflow");
- eap_tnc_set_state(data, FAIL);
- return -1;
- }
-
- wpabuf_put_data(data->in_buf, buf, len);
- wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes, waiting for %lu "
- "bytes more", (unsigned long) len,
- (unsigned long) wpabuf_tailroom(data->in_buf));
-
- return 0;
-}
-
-
-static int eap_tnc_process_fragment(struct eap_tnc_data *data,
- u8 flags, u32 message_length,
- const u8 *buf, size_t len)
-{
- /* Process a fragment that is not the last one of the message */
- if (data->in_buf == NULL && !(flags & EAP_TNC_FLAGS_LENGTH_INCLUDED)) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: No Message Length field in a "
- "fragmented packet");
- return -1;
- }
-
- if (data->in_buf == NULL) {
- /* First fragment of the message */
- data->in_buf = wpabuf_alloc(message_length);
- if (data->in_buf == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: No memory for "
- "message");
- return -1;
- }
- wpabuf_put_data(data->in_buf, buf, len);
- wpa_printf(MSG_DEBUG, "EAP-TNC: Received %lu bytes in first "
- "fragment, waiting for %lu bytes more",
- (unsigned long) len,
- (unsigned long) wpabuf_tailroom(data->in_buf));
- }
-
- return 0;
-}
-
-
-static void eap_tnc_process(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- struct eap_tnc_data *data = priv;
- const u8 *pos, *end;
- size_t len;
- u8 flags;
- u32 message_length = 0;
- struct wpabuf tmpbuf;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TNC, respData, &len);
- if (pos == NULL)
- return; /* Should not happen; message already verified */
-
- end = pos + len;
-
- if (len == 1 && (data->state == DONE || data->state == FAIL)) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Peer acknowledged the last "
- "message");
- return;
- }
-
- if (len == 0) {
- /* fragment ack */
- flags = 0;
- } else
- flags = *pos++;
-
- if (flags & EAP_TNC_FLAGS_LENGTH_INCLUDED) {
- if (end - pos < 4) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Message underflow");
- eap_tnc_set_state(data, FAIL);
- return;
- }
- message_length = WPA_GET_BE32(pos);
- pos += 4;
-
- if (message_length < (u32) (end - pos)) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Invalid Message "
- "Length (%d; %ld remaining in this msg)",
- message_length, (long) (end - pos));
- eap_tnc_set_state(data, FAIL);
- return;
- }
- }
- wpa_printf(MSG_DEBUG, "EAP-TNC: Received packet: Flags 0x%x "
- "Message Length %u", flags, message_length);
-
- if (data->state == WAIT_FRAG_ACK) {
- if (len > 1) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: Unexpected payload "
- "in WAIT_FRAG_ACK state");
- eap_tnc_set_state(data, FAIL);
- return;
- }
- wpa_printf(MSG_DEBUG, "EAP-TNC: Fragment acknowledged");
- eap_tnc_set_state(data, CONTINUE);
- return;
- }
-
- if (data->in_buf && eap_tnc_process_cont(data, pos, end - pos) < 0) {
- eap_tnc_set_state(data, FAIL);
- return;
- }
-
- if (flags & EAP_TNC_FLAGS_MORE_FRAGMENTS) {
- if (eap_tnc_process_fragment(data, flags, message_length,
- pos, end - pos) < 0)
- eap_tnc_set_state(data, FAIL);
- else
- eap_tnc_set_state(data, FRAG_ACK);
- return;
- } else if (data->state == FRAG_ACK) {
- wpa_printf(MSG_DEBUG, "EAP-TNC: All fragments received");
- eap_tnc_set_state(data, CONTINUE);
- }
-
- if (data->in_buf == NULL) {
- /* Wrap unfragmented messages as wpabuf without extra copy */
- wpabuf_set(&tmpbuf, pos, end - pos);
- data->in_buf = &tmpbuf;
- }
-
- wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TNC: Received payload",
- wpabuf_head(data->in_buf), wpabuf_len(data->in_buf));
- tncs_process(data, data->in_buf);
-
- if (data->in_buf != &tmpbuf)
- wpabuf_free(data->in_buf);
- data->in_buf = NULL;
-}
-
-
-static Boolean eap_tnc_isDone(struct eap_sm *sm, void *priv)
-{
- struct eap_tnc_data *data = priv;
- return data->state == DONE || data->state == FAIL;
-}
-
-
-static Boolean eap_tnc_isSuccess(struct eap_sm *sm, void *priv)
-{
- struct eap_tnc_data *data = priv;
- return data->state == DONE;
-}
-
-
-int eap_server_tnc_register(void)
-{
- struct eap_method *eap;
- int ret;
-
- eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_TNC, "TNC");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_tnc_init;
- eap->reset = eap_tnc_reset;
- eap->buildReq = eap_tnc_buildReq;
- eap->check = eap_tnc_check;
- eap->process = eap_tnc_process;
- eap->isDone = eap_tnc_isDone;
- eap->isSuccess = eap_tnc_isSuccess;
-
- ret = eap_server_method_register(eap);
- if (ret)
- eap_server_method_free(eap);
- return ret;
-}
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