Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/dist/hostapd/eapol_sm.c

1260 lines
31 KiB
C
Raw Blame History

/*
* Host AP (software wireless LAN access point) user space daemon for
* Host AP kernel driver / IEEE 802.1X Authenticator - EAPOL state machine
* Copyright (c) 2002-2005, Jouni Malinen <jkmaline@cc.hut.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 <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>
#include "hostapd.h"
#include "ieee802_1x.h"
#include "eapol_sm.h"
#include "eloop.h"
#include "wpa.h"
#include "sta_info.h"
#include "eap.h"
static struct eapol_callbacks eapol_cb;
/* EAPOL state machines are described in IEEE Std 802.1X-REV-d11, Chap. 8.2 */
#define setPortAuthorized() \
ieee802_1x_set_sta_authorized(sm->hapd, sm->sta, 1)
#define setPortUnauthorized() \
ieee802_1x_set_sta_authorized(sm->hapd, sm->sta, 0)
/* procedures */
#define txCannedFail() ieee802_1x_tx_canned_eap(sm->hapd, sm->sta, 0)
#define txCannedSuccess() ieee802_1x_tx_canned_eap(sm->hapd, sm->sta, 1)
#define txReq() ieee802_1x_tx_req(sm->hapd, sm->sta)
#define sendRespToServer() ieee802_1x_send_resp_to_server(sm->hapd, sm->sta)
#define abortAuth() ieee802_1x_abort_auth(sm->hapd, sm->sta)
#define txKey() ieee802_1x_tx_key(sm->hapd, sm->sta)
#define processKey() do { } while (0)
/* Definitions for clarifying state machine implementation */
#define SM_STATE(machine, state) \
static void sm_ ## machine ## _ ## state ## _Enter(struct eapol_state_machine \
*sm)
#define SM_ENTRY(machine, _state, _data) \
sm->_data.state = machine ## _ ## _state; \
if (sm->hapd->conf->debug >= HOSTAPD_DEBUG_MINIMAL) \
printf("IEEE 802.1X: " MACSTR " " #machine " entering state " #_state \
"\n", MAC2STR(sm->addr));
#define SM_ENTER(machine, state) sm_ ## machine ## _ ## state ## _Enter(sm)
#define SM_STEP(machine) \
static void sm_ ## machine ## _Step(struct eapol_state_machine *sm)
#define SM_STEP_RUN(machine) sm_ ## machine ## _Step(sm)
static void eapol_sm_step_run(struct eapol_state_machine *sm);
static void eapol_sm_step_cb(void *eloop_ctx, void *timeout_ctx);
/* Port Timers state machine - implemented as a function that will be called
* once a second as a registered event loop timeout */
static void eapol_port_timers_tick(void *eloop_ctx, void *timeout_ctx)
{
struct eapol_state_machine *state = timeout_ctx;
if (state->aWhile > 0) {
state->aWhile--;
if (state->aWhile == 0) {
wpa_printf(MSG_DEBUG, "IEEE 802.1X: " MACSTR
" - aWhile --> 0",
MAC2STR(state->addr));
}
}
if (state->quietWhile > 0) {
state->quietWhile--;
if (state->quietWhile == 0) {
wpa_printf(MSG_DEBUG, "IEEE 802.1X: " MACSTR
" - quietWhile --> 0",
MAC2STR(state->addr));
}
}
if (state->reAuthWhen > 0) {
state->reAuthWhen--;
if (state->reAuthWhen == 0) {
wpa_printf(MSG_DEBUG, "IEEE 802.1X: " MACSTR
" - reAuthWhen --> 0",
MAC2STR(state->addr));
}
}
eapol_sm_step_run(state);
eloop_register_timeout(1, 0, eapol_port_timers_tick, eloop_ctx, state);
}
/* Authenticator PAE state machine */
SM_STATE(AUTH_PAE, INITIALIZE)
{
SM_ENTRY(AUTH_PAE, INITIALIZE, auth_pae);
sm->auth_pae.portMode = Auto;
sm->currentId = 255;
}
SM_STATE(AUTH_PAE, DISCONNECTED)
{
int from_initialize = sm->auth_pae.state == AUTH_PAE_INITIALIZE;
if (sm->auth_pae.eapolLogoff) {
if (sm->auth_pae.state == AUTH_PAE_CONNECTING)
sm->auth_pae.authEapLogoffsWhileConnecting++;
else if (sm->auth_pae.state == AUTH_PAE_AUTHENTICATED)
sm->auth_pae.authAuthEapLogoffWhileAuthenticated++;
}
SM_ENTRY(AUTH_PAE, DISCONNECTED, auth_pae);
sm->authPortStatus = Unauthorized;
setPortUnauthorized();
sm->auth_pae.reAuthCount = 0;
sm->auth_pae.eapolLogoff = FALSE;
if (!from_initialize) {
if (sm->flags & EAPOL_SM_PREAUTH)
rsn_preauth_finished(sm->hapd, sm->sta, 0);
else
ieee802_1x_finished(sm->hapd, sm->sta, 0);
}
}
SM_STATE(AUTH_PAE, RESTART)
{
if (sm->auth_pae.state == AUTH_PAE_AUTHENTICATED) {
if (sm->reAuthenticate)
sm->auth_pae.authAuthReauthsWhileAuthenticated++;
if (sm->auth_pae.eapolStart)
sm->auth_pae.authAuthEapStartsWhileAuthenticated++;
if (sm->auth_pae.eapolLogoff)
sm->auth_pae.authAuthEapLogoffWhileAuthenticated++;
}
SM_ENTRY(AUTH_PAE, RESTART, auth_pae);
sm->auth_pae.eapRestart = TRUE;
ieee802_1x_request_identity(sm->hapd, sm->sta);
}
SM_STATE(AUTH_PAE, CONNECTING)
{
if (sm->auth_pae.state != AUTH_PAE_CONNECTING)
sm->auth_pae.authEntersConnecting++;
SM_ENTRY(AUTH_PAE, CONNECTING, auth_pae);
sm->reAuthenticate = FALSE;
sm->auth_pae.reAuthCount++;
}
SM_STATE(AUTH_PAE, HELD)
{
if (sm->auth_pae.state == AUTH_PAE_AUTHENTICATING && sm->authFail)
sm->auth_pae.authAuthFailWhileAuthenticating++;
SM_ENTRY(AUTH_PAE, HELD, auth_pae);
sm->authPortStatus = Unauthorized;
setPortUnauthorized();
sm->quietWhile = sm->auth_pae.quietPeriod;
sm->auth_pae.eapolLogoff = FALSE;
hostapd_logger(sm->hapd, sm->addr, HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_WARNING, "authentication failed");
if (sm->flags & EAPOL_SM_PREAUTH)
rsn_preauth_finished(sm->hapd, sm->sta, 0);
else
ieee802_1x_finished(sm->hapd, sm->sta, 0);
}
SM_STATE(AUTH_PAE, AUTHENTICATED)
{
if (sm->auth_pae.state == AUTH_PAE_AUTHENTICATING && sm->authSuccess)
sm->auth_pae.authAuthSuccessesWhileAuthenticating++;
SM_ENTRY(AUTH_PAE, AUTHENTICATED, auth_pae);
sm->authPortStatus = Authorized;
setPortAuthorized();
sm->auth_pae.reAuthCount = 0;
hostapd_logger(sm->hapd, sm->addr, HOSTAPD_MODULE_IEEE8021X,
HOSTAPD_LEVEL_INFO, "authenticated");
if (sm->flags & EAPOL_SM_PREAUTH)
rsn_preauth_finished(sm->hapd, sm->sta, 1);
else
ieee802_1x_finished(sm->hapd, sm->sta, 1);
}
SM_STATE(AUTH_PAE, AUTHENTICATING)
{
if (sm->auth_pae.state == AUTH_PAE_CONNECTING && sm->rx_identity) {
sm->auth_pae.authEntersAuthenticating++;
sm->rx_identity = FALSE;
}
SM_ENTRY(AUTH_PAE, AUTHENTICATING, auth_pae);
sm->auth_pae.eapolStart = FALSE;
sm->authSuccess = FALSE;
sm->authFail = FALSE;
sm->authTimeout = FALSE;
sm->authStart = TRUE;
sm->keyRun = FALSE;
sm->keyDone = FALSE;
}
SM_STATE(AUTH_PAE, ABORTING)
{
if (sm->auth_pae.state == AUTH_PAE_AUTHENTICATING) {
if (sm->authTimeout)
sm->auth_pae.authAuthTimeoutsWhileAuthenticating++;
if (sm->auth_pae.eapolStart)
sm->auth_pae.authAuthEapStartsWhileAuthenticating++;
if (sm->auth_pae.eapolLogoff)
sm->auth_pae.authAuthEapLogoffWhileAuthenticating++;
}
SM_ENTRY(AUTH_PAE, ABORTING, auth_pae);
sm->authAbort = TRUE;
sm->keyRun = FALSE;
sm->keyDone = FALSE;
}
SM_STATE(AUTH_PAE, FORCE_AUTH)
{
SM_ENTRY(AUTH_PAE, FORCE_AUTH, auth_pae);
sm->authPortStatus = Authorized;
setPortAuthorized();
sm->auth_pae.portMode = ForceAuthorized;
sm->auth_pae.eapolStart = FALSE;
txCannedSuccess();
}
SM_STATE(AUTH_PAE, FORCE_UNAUTH)
{
SM_ENTRY(AUTH_PAE, FORCE_UNAUTH, auth_pae);
sm->authPortStatus = Unauthorized;
setPortUnauthorized();
sm->auth_pae.portMode = ForceUnauthorized;
sm->auth_pae.eapolStart = FALSE;
txCannedFail();
}
SM_STEP(AUTH_PAE)
{
if ((sm->portControl == Auto &&
sm->auth_pae.portMode != sm->portControl) ||
sm->initialize || !sm->portEnabled)
SM_ENTER(AUTH_PAE, INITIALIZE);
else if (sm->portControl == ForceAuthorized &&
sm->auth_pae.portMode != sm->portControl &&
!(sm->initialize || !sm->portEnabled))
SM_ENTER(AUTH_PAE, FORCE_AUTH);
else if (sm->portControl == ForceUnauthorized &&
sm->auth_pae.portMode != sm->portControl &&
!(sm->initialize || !sm->portEnabled))
SM_ENTER(AUTH_PAE, FORCE_UNAUTH);
else {
switch (sm->auth_pae.state) {
case AUTH_PAE_INITIALIZE:
SM_ENTER(AUTH_PAE, DISCONNECTED);
break;
case AUTH_PAE_DISCONNECTED:
SM_ENTER(AUTH_PAE, RESTART);
break;
case AUTH_PAE_RESTART:
if (!sm->auth_pae.eapRestart)
SM_ENTER(AUTH_PAE, CONNECTING);
break;
case AUTH_PAE_HELD:
if (sm->quietWhile == 0)
SM_ENTER(AUTH_PAE, RESTART);
break;
case AUTH_PAE_CONNECTING:
if (sm->auth_pae.eapolLogoff ||
sm->auth_pae.reAuthCount > sm->auth_pae.reAuthMax)
SM_ENTER(AUTH_PAE, DISCONNECTED);
else if ((sm->be_auth.eapReq &&
sm->auth_pae.reAuthCount <=
sm->auth_pae.reAuthMax) ||
sm->eapSuccess || sm->eapFail)
SM_ENTER(AUTH_PAE, AUTHENTICATING);
break;
case AUTH_PAE_AUTHENTICATED:
if (sm->auth_pae.eapolStart || sm->reAuthenticate)
SM_ENTER(AUTH_PAE, RESTART);
else if (sm->auth_pae.eapolLogoff || !sm->portValid)
SM_ENTER(AUTH_PAE, DISCONNECTED);
break;
case AUTH_PAE_AUTHENTICATING:
if (sm->authSuccess && sm->portValid)
SM_ENTER(AUTH_PAE, AUTHENTICATED);
else if (sm->authFail ||
(sm->keyDone && !sm->portValid))
SM_ENTER(AUTH_PAE, HELD);
else if (sm->auth_pae.eapolStart ||
sm->auth_pae.eapolLogoff || sm->authTimeout)
SM_ENTER(AUTH_PAE, ABORTING);
break;
case AUTH_PAE_ABORTING:
if (sm->auth_pae.eapolLogoff && !sm->authAbort)
SM_ENTER(AUTH_PAE, DISCONNECTED);
else if (!sm->auth_pae.eapolLogoff && !sm->authAbort)
SM_ENTER(AUTH_PAE, RESTART);
break;
case AUTH_PAE_FORCE_AUTH:
if (sm->auth_pae.eapolStart)
SM_ENTER(AUTH_PAE, FORCE_AUTH);
break;
case AUTH_PAE_FORCE_UNAUTH:
if (sm->auth_pae.eapolStart)
SM_ENTER(AUTH_PAE, FORCE_UNAUTH);
break;
}
}
}
/* Backend Authentication state machine */
SM_STATE(BE_AUTH, INITIALIZE)
{
SM_ENTRY(BE_AUTH, INITIALIZE, be_auth);
abortAuth();
sm->be_auth.eapNoReq = FALSE;
sm->authAbort = FALSE;
}
SM_STATE(BE_AUTH, REQUEST)
{
SM_ENTRY(BE_AUTH, REQUEST, be_auth);
txReq();
sm->be_auth.eapReq = FALSE;
sm->be_auth.backendOtherRequestsToSupplicant++;
/*
* Clearing eapolEap here is not specified in IEEE Std 802.1X-2004, but
* it looks like this would be logical thing to do there since the old
* EAP response would not be valid anymore after the new EAP request
* was sent out.
*
* A race condition has been reported, in which hostapd ended up
* sending out EAP-Response/Identity as a response to the first
* EAP-Request from the main EAP method. This can be avoided by
* clearing eapolEap here.
*/
sm->eapolEap = FALSE;
}
SM_STATE(BE_AUTH, RESPONSE)
{
SM_ENTRY(BE_AUTH, RESPONSE, be_auth);
sm->authTimeout = FALSE;
sm->eapolEap = FALSE;
sm->be_auth.eapNoReq = FALSE;
sm->aWhile = sm->be_auth.serverTimeout;
sm->be_auth.eapResp = TRUE;
sendRespToServer();
sm->be_auth.backendResponses++;
}
SM_STATE(BE_AUTH, SUCCESS)
{
SM_ENTRY(BE_AUTH, SUCCESS, be_auth);
txReq();
sm->authSuccess = TRUE;
sm->keyRun = TRUE;
}
SM_STATE(BE_AUTH, FAIL)
{
SM_ENTRY(BE_AUTH, FAIL, be_auth);
/* Note: IEEE 802.1X-REV-d11 has unconditional txReq() here.
* txCannelFail() is used as a workaround for the case where
* authentication server does not include EAP-Message with
* Access-Reject. */
if (sm->last_eap_radius == NULL)
txCannedFail();
else
txReq();
sm->authFail = TRUE;
}
SM_STATE(BE_AUTH, TIMEOUT)
{
SM_ENTRY(BE_AUTH, TIMEOUT, be_auth);
sm->authTimeout = TRUE;
}
SM_STATE(BE_AUTH, IDLE)
{
SM_ENTRY(BE_AUTH, IDLE, be_auth);
sm->authStart = FALSE;
}
SM_STATE(BE_AUTH, IGNORE)
{
SM_ENTRY(BE_AUTH, IGNORE, be_auth);
sm->be_auth.eapNoReq = FALSE;
}
SM_STEP(BE_AUTH)
{
if (sm->portControl != Auto || sm->initialize || sm->authAbort) {
SM_ENTER(BE_AUTH, INITIALIZE);
return;
}
switch (sm->be_auth.state) {
case BE_AUTH_INITIALIZE:
SM_ENTER(BE_AUTH, IDLE);
break;
case BE_AUTH_REQUEST:
if (sm->eapolEap)
SM_ENTER(BE_AUTH, RESPONSE);
else if (sm->be_auth.eapReq)
SM_ENTER(BE_AUTH, REQUEST);
else if (sm->eapTimeout)
SM_ENTER(BE_AUTH, TIMEOUT);
break;
case BE_AUTH_RESPONSE:
if (sm->be_auth.eapNoReq)
SM_ENTER(BE_AUTH, IGNORE);
if (sm->be_auth.eapReq) {
sm->be_auth.backendAccessChallenges++;
SM_ENTER(BE_AUTH, REQUEST);
} else if (sm->aWhile == 0)
SM_ENTER(BE_AUTH, TIMEOUT);
else if (sm->eapFail) {
sm->be_auth.backendAuthFails++;
SM_ENTER(BE_AUTH, FAIL);
} else if (sm->eapSuccess) {
sm->be_auth.backendAuthSuccesses++;
SM_ENTER(BE_AUTH, SUCCESS);
}
break;
case BE_AUTH_SUCCESS:
SM_ENTER(BE_AUTH, IDLE);
break;
case BE_AUTH_FAIL:
SM_ENTER(BE_AUTH, IDLE);
break;
case BE_AUTH_TIMEOUT:
SM_ENTER(BE_AUTH, IDLE);
break;
case BE_AUTH_IDLE:
if (sm->eapFail && sm->authStart)
SM_ENTER(BE_AUTH, FAIL);
else if (sm->be_auth.eapReq && sm->authStart)
SM_ENTER(BE_AUTH, REQUEST);
else if (sm->eapSuccess && sm->authStart)
SM_ENTER(BE_AUTH, SUCCESS);
break;
case BE_AUTH_IGNORE:
if (sm->eapolEap)
SM_ENTER(BE_AUTH, RESPONSE);
else if (sm->be_auth.eapReq)
SM_ENTER(BE_AUTH, REQUEST);
else if (sm->eapTimeout)
SM_ENTER(BE_AUTH, TIMEOUT);
break;
}
}
/* Reauthentication Timer state machine */
SM_STATE(REAUTH_TIMER, INITIALIZE)
{
SM_ENTRY(REAUTH_TIMER, INITIALIZE, reauth_timer);
sm->reAuthWhen = sm->reauth_timer.reAuthPeriod;
}
SM_STATE(REAUTH_TIMER, REAUTHENTICATE)
{
SM_ENTRY(REAUTH_TIMER, REAUTHENTICATE, reauth_timer);
sm->reAuthenticate = TRUE;
wpa_sm_event(sm->hapd, sm->sta, WPA_REAUTH_EAPOL);
}
SM_STEP(REAUTH_TIMER)
{
if (sm->portControl != Auto || sm->initialize ||
sm->authPortStatus == Unauthorized ||
!sm->reauth_timer.reAuthEnabled) {
SM_ENTER(REAUTH_TIMER, INITIALIZE);
return;
}
switch (sm->reauth_timer.state) {
case REAUTH_TIMER_INITIALIZE:
if (sm->reAuthWhen == 0)
SM_ENTER(REAUTH_TIMER, REAUTHENTICATE);
break;
case REAUTH_TIMER_REAUTHENTICATE:
SM_ENTER(REAUTH_TIMER, INITIALIZE);
break;
}
}
/* Authenticator Key Transmit state machine */
SM_STATE(AUTH_KEY_TX, NO_KEY_TRANSMIT)
{
SM_ENTRY(AUTH_KEY_TX, NO_KEY_TRANSMIT, auth_key_tx);
}
SM_STATE(AUTH_KEY_TX, KEY_TRANSMIT)
{
SM_ENTRY(AUTH_KEY_TX, KEY_TRANSMIT, auth_key_tx);
txKey();
sm->keyAvailable = FALSE;
sm->keyDone = TRUE;
}
SM_STEP(AUTH_KEY_TX)
{
if (sm->initialize || sm->portControl != Auto) {
SM_ENTER(AUTH_KEY_TX, NO_KEY_TRANSMIT);
return;
}
switch (sm->auth_key_tx.state) {
case AUTH_KEY_TX_NO_KEY_TRANSMIT:
if (sm->keyTxEnabled && sm->keyAvailable && sm->keyRun &&
!sm->sta->wpa)
SM_ENTER(AUTH_KEY_TX, KEY_TRANSMIT);
break;
case AUTH_KEY_TX_KEY_TRANSMIT:
if (!sm->keyTxEnabled || !sm->keyRun)
SM_ENTER(AUTH_KEY_TX, NO_KEY_TRANSMIT);
else if (sm->keyAvailable)
SM_ENTER(AUTH_KEY_TX, KEY_TRANSMIT);
break;
}
}
/* Key Receive state machine */
SM_STATE(KEY_RX, NO_KEY_RECEIVE)
{
SM_ENTRY(KEY_RX, NO_KEY_RECEIVE, key_rx);
}
SM_STATE(KEY_RX, KEY_RECEIVE)
{
SM_ENTRY(KEY_RX, KEY_RECEIVE, key_rx);
processKey();
sm->key_rx.rxKey = FALSE;
}
SM_STEP(KEY_RX)
{
if (sm->initialize || !sm->portEnabled) {
SM_ENTER(KEY_RX, NO_KEY_RECEIVE);
return;
}
switch (sm->key_rx.state) {
case KEY_RX_NO_KEY_RECEIVE:
if (sm->key_rx.rxKey)
SM_ENTER(KEY_RX, KEY_RECEIVE);
break;
case KEY_RX_KEY_RECEIVE:
if (sm->key_rx.rxKey)
SM_ENTER(KEY_RX, KEY_RECEIVE);
break;
}
}
/* Controlled Directions state machine */
SM_STATE(CTRL_DIR, FORCE_BOTH)
{
SM_ENTRY(CTRL_DIR, FORCE_BOTH, ctrl_dir);
sm->ctrl_dir.operControlledDirections = Both;
}
SM_STATE(CTRL_DIR, IN_OR_BOTH)
{
SM_ENTRY(CTRL_DIR, IN_OR_BOTH, ctrl_dir);
sm->ctrl_dir.operControlledDirections =
sm->ctrl_dir.adminControlledDirections;
}
SM_STEP(CTRL_DIR)
{
if (sm->initialize) {
SM_ENTER(CTRL_DIR, IN_OR_BOTH);
return;
}
switch (sm->ctrl_dir.state) {
case CTRL_DIR_FORCE_BOTH:
if (sm->portEnabled && sm->ctrl_dir.operEdge)
SM_ENTER(CTRL_DIR, IN_OR_BOTH);
break;
case CTRL_DIR_IN_OR_BOTH:
if (sm->ctrl_dir.operControlledDirections !=
sm->ctrl_dir.adminControlledDirections)
SM_ENTER(CTRL_DIR, IN_OR_BOTH);
if (!sm->portEnabled || !sm->ctrl_dir.operEdge)
SM_ENTER(CTRL_DIR, FORCE_BOTH);
break;
}
}
struct eapol_state_machine *
eapol_sm_alloc(hostapd *hapd, struct sta_info *sta)
{
struct eapol_state_machine *sm;
sm = (struct eapol_state_machine *) malloc(sizeof(*sm));
if (sm == NULL) {
printf("IEEE 802.1X port state allocation failed\n");
return NULL;
}
memset(sm, 0, sizeof(*sm));
sm->radius_identifier = -1;
memcpy(sm->addr, sta->addr, ETH_ALEN);
if (sta->flags & WLAN_STA_PREAUTH)
sm->flags |= EAPOL_SM_PREAUTH;
sm->hapd = hapd;
sm->sta = sta;
/* Set default values for state machine constants */
sm->auth_pae.state = AUTH_PAE_INITIALIZE;
sm->auth_pae.quietPeriod = AUTH_PAE_DEFAULT_quietPeriod;
sm->auth_pae.reAuthMax = AUTH_PAE_DEFAULT_reAuthMax;
sm->be_auth.state = BE_AUTH_INITIALIZE;
sm->be_auth.serverTimeout = BE_AUTH_DEFAULT_serverTimeout;
sm->reauth_timer.state = REAUTH_TIMER_INITIALIZE;
sm->reauth_timer.reAuthPeriod = hapd->conf->eap_reauth_period;
sm->reauth_timer.reAuthEnabled = hapd->conf->eap_reauth_period > 0 ?
TRUE : FALSE;
sm->auth_key_tx.state = AUTH_KEY_TX_NO_KEY_TRANSMIT;
sm->key_rx.state = KEY_RX_NO_KEY_RECEIVE;
sm->ctrl_dir.state = CTRL_DIR_IN_OR_BOTH;
sm->portEnabled = FALSE;
sm->portControl = Auto;
sm->keyAvailable = FALSE;
if (!hapd->conf->wpa &&
(hapd->default_wep_key || hapd->conf->individual_wep_key_len > 0))
sm->keyTxEnabled = TRUE;
else
sm->keyTxEnabled = FALSE;
if (hapd->conf->wpa)
sm->portValid = FALSE;
else
sm->portValid = TRUE;
if (hapd->conf->eap_server) {
struct eap_config eap_conf;
memset(&eap_conf, 0, sizeof(eap_conf));
eap_conf.ssl_ctx = hapd->ssl_ctx;
eap_conf.eap_sim_db_priv = hapd->eap_sim_db_priv;
sm->eap = eap_sm_init(sm, &eapol_cb, &eap_conf);
if (sm->eap == NULL) {
eapol_sm_free(sm);
return NULL;
}
}
eapol_sm_initialize(sm);
return sm;
}
void eapol_sm_free(struct eapol_state_machine *sm)
{
if (sm == NULL)
return;
eloop_cancel_timeout(eapol_port_timers_tick, sm->hapd, sm);
eloop_cancel_timeout(eapol_sm_step_cb, sm, NULL);
if (sm->eap)
eap_sm_deinit(sm->eap);
free(sm);
}
static int eapol_sm_sta_entry_alive(struct hostapd_data *hapd, u8 *addr)
{
struct sta_info *sta;
sta = ap_get_sta(hapd, addr);
if (sta == NULL || sta->eapol_sm == NULL)
return 0;
return 1;
}
static void eapol_sm_step_run(struct eapol_state_machine *sm)
{
struct hostapd_data *hapd = sm->hapd;
u8 addr[ETH_ALEN];
int prev_auth_pae, prev_be_auth, prev_reauth_timer, prev_auth_key_tx,
prev_key_rx, prev_ctrl_dir;
int max_steps = 100;
memcpy(addr, sm->sta->addr, ETH_ALEN);
/*
* Allow EAPOL state machines to run as long as there are state
* changes, but exit and return here through event loop if more than
* 100 steps is needed as a precaution against infinite loops inside
* eloop callback.
*/
restart:
prev_auth_pae = sm->auth_pae.state;
prev_be_auth = sm->be_auth.state;
prev_reauth_timer = sm->reauth_timer.state;
prev_auth_key_tx = sm->auth_key_tx.state;
prev_key_rx = sm->key_rx.state;
prev_ctrl_dir = sm->ctrl_dir.state;
SM_STEP_RUN(AUTH_PAE);
if (sm->initializing || eapol_sm_sta_entry_alive(hapd, addr))
SM_STEP_RUN(BE_AUTH);
if (sm->initializing || eapol_sm_sta_entry_alive(hapd, addr))
SM_STEP_RUN(REAUTH_TIMER);
if (sm->initializing || eapol_sm_sta_entry_alive(hapd, addr))
SM_STEP_RUN(AUTH_KEY_TX);
if (sm->initializing || eapol_sm_sta_entry_alive(hapd, addr))
SM_STEP_RUN(KEY_RX);
if (sm->initializing || eapol_sm_sta_entry_alive(hapd, addr))
SM_STEP_RUN(CTRL_DIR);
if (prev_auth_pae != sm->auth_pae.state ||
prev_be_auth != sm->be_auth.state ||
prev_reauth_timer != sm->reauth_timer.state ||
prev_auth_key_tx != sm->auth_key_tx.state ||
prev_key_rx != sm->key_rx.state ||
prev_ctrl_dir != sm->ctrl_dir.state) {
if (--max_steps > 0)
goto restart;
/* Re-run from eloop timeout */
eapol_sm_step(sm);
return;
}
if (eapol_sm_sta_entry_alive(hapd, addr) && sm->eap) {
if (eap_sm_step(sm->eap)) {
if (--max_steps > 0)
goto restart;
/* Re-run from eloop timeout */
eapol_sm_step(sm);
return;
}
}
if (eapol_sm_sta_entry_alive(hapd, addr))
wpa_sm_notify(sm->hapd, sm->sta);
}
static void eapol_sm_step_cb(void *eloop_ctx, void *timeout_ctx)
{
struct eapol_state_machine *sm = eloop_ctx;
eapol_sm_step_run(sm);
}
void eapol_sm_step(struct eapol_state_machine *sm)
{
/*
* Run eapol_sm_step_run from a registered timeout to make sure that
* other possible timeouts/events are processed and to avoid long
* function call chains.
*/
eloop_register_timeout(0, 0, eapol_sm_step_cb, sm, NULL);
}
void eapol_sm_initialize(struct eapol_state_machine *sm)
{
sm->initializing = TRUE;
/* Initialize the state machines by asserting initialize and then
* deasserting it after one step */
sm->initialize = TRUE;
eapol_sm_step_run(sm);
sm->initialize = FALSE;
eapol_sm_step_run(sm);
sm->initializing = FALSE;
/* Start one second tick for port timers state machine */
eloop_cancel_timeout(eapol_port_timers_tick, sm->hapd, sm);
eloop_register_timeout(1, 0, eapol_port_timers_tick, sm->hapd, sm);
}
#ifdef HOSTAPD_DUMP_STATE
static inline const char * port_type_txt(PortTypes pt)
{
switch (pt) {
case ForceUnauthorized: return "ForceUnauthorized";
case ForceAuthorized: return "ForceAuthorized";
case Auto: return "Auto";
default: return "Unknown";
}
}
static inline const char * port_state_txt(PortState ps)
{
switch (ps) {
case Unauthorized: return "Unauthorized";
case Authorized: return "Authorized";
default: return "Unknown";
}
}
static inline const char * ctrl_dir_txt(ControlledDirection dir)
{
switch (dir) {
case Both: return "Both";
case In: return "In";
default: return "Unknown";
}
}
static inline const char * auth_pae_state_txt(int s)
{
switch (s) {
case AUTH_PAE_INITIALIZE: return "INITIALIZE";
case AUTH_PAE_DISCONNECTED: return "DISCONNECTED";
case AUTH_PAE_CONNECTING: return "CONNECTING";
case AUTH_PAE_AUTHENTICATING: return "AUTHENTICATING";
case AUTH_PAE_AUTHENTICATED: return "AUTHENTICATED";
case AUTH_PAE_ABORTING: return "ABORTING";
case AUTH_PAE_HELD: return "HELD";
case AUTH_PAE_FORCE_AUTH: return "FORCE_AUTH";
case AUTH_PAE_FORCE_UNAUTH: return "FORCE_UNAUTH";
case AUTH_PAE_RESTART: return "RESTART";
default: return "Unknown";
}
}
static inline const char * be_auth_state_txt(int s)
{
switch (s) {
case BE_AUTH_REQUEST: return "REQUEST";
case BE_AUTH_RESPONSE: return "RESPONSE";
case BE_AUTH_SUCCESS: return "SUCCESS";
case BE_AUTH_FAIL: return "FAIL";
case BE_AUTH_TIMEOUT: return "TIMEOUT";
case BE_AUTH_IDLE: return "IDLE";
case BE_AUTH_INITIALIZE: return "INITIALIZE";
case BE_AUTH_IGNORE: return "IGNORE";
default: return "Unknown";
}
}
static inline const char * reauth_timer_state_txt(int s)
{
switch (s) {
case REAUTH_TIMER_INITIALIZE: return "INITIALIZE";
case REAUTH_TIMER_REAUTHENTICATE: return "REAUTHENTICATE";
default: return "Unknown";
}
}
static inline const char * auth_key_tx_state_txt(int s)
{
switch (s) {
case AUTH_KEY_TX_NO_KEY_TRANSMIT: return "NO_KEY_TRANSMIT";
case AUTH_KEY_TX_KEY_TRANSMIT: return "KEY_TRANSMIT";
default: return "Unknown";
}
}
static inline const char * key_rx_state_txt(int s)
{
switch (s) {
case KEY_RX_NO_KEY_RECEIVE: return "NO_KEY_RECEIVE";
case KEY_RX_KEY_RECEIVE: return "KEY_RECEIVE";
default: return "Unknown";
}
}
static inline const char * ctrl_dir_state_txt(int s)
{
switch (s) {
case CTRL_DIR_FORCE_BOTH: return "FORCE_BOTH";
case CTRL_DIR_IN_OR_BOTH: return "IN_OR_BOTH";
default: return "Unknown";
}
}
void eapol_sm_dump_state(FILE *f, const char *prefix,
struct eapol_state_machine *sm)
{
fprintf(f, "%sEAPOL state machine:\n", prefix);
fprintf(f, "%s aWhile=%d quietWhile=%d reAuthWhen=%d\n", prefix,
sm->aWhile, sm->quietWhile, sm->reAuthWhen);
#define _SB(b) ((b) ? "TRUE" : "FALSE")
fprintf(f,
"%s authAbort=%s authFail=%s authPortStatus=%s authStart=%s\n"
"%s authTimeout=%s authSuccess=%s eapFail=%s eapolEap=%s\n"
"%s eapSuccess=%s eapTimeout=%s initialize=%s "
"keyAvailable=%s\n"
"%s keyDone=%s keyRun=%s keyTxEnabled=%s portControl=%s\n"
"%s portEnabled=%s portValid=%s reAuthenticate=%s\n",
prefix, _SB(sm->authAbort), _SB(sm->authFail),
port_state_txt(sm->authPortStatus), _SB(sm->authStart),
prefix, _SB(sm->authTimeout), _SB(sm->authSuccess),
_SB(sm->eapFail), _SB(sm->eapolEap),
prefix, _SB(sm->eapSuccess), _SB(sm->eapTimeout),
_SB(sm->initialize), _SB(sm->keyAvailable),
prefix, _SB(sm->keyDone), _SB(sm->keyRun),
_SB(sm->keyTxEnabled), port_type_txt(sm->portControl),
prefix, _SB(sm->portEnabled), _SB(sm->portValid),
_SB(sm->reAuthenticate));
fprintf(f, "%s Authenticator PAE:\n"
"%s state=%s\n"
"%s eapolLogoff=%s eapolStart=%s eapRestart=%s\n"
"%s portMode=%s reAuthCount=%d\n"
"%s quietPeriod=%d reAuthMax=%d\n"
"%s authEntersConnecting=%d\n"
"%s authEapLogoffsWhileConnecting=%d\n"
"%s authEntersAuthenticating=%d\n"
"%s authAuthSuccessesWhileAuthenticating=%d\n"
"%s authAuthTimeoutsWhileAuthenticating=%d\n"
"%s authAuthFailWhileAuthenticating=%d\n"
"%s authAuthEapStartsWhileAuthenticating=%d\n"
"%s authAuthEapLogoffWhileAuthenticating=%d\n"
"%s authAuthReauthsWhileAuthenticated=%d\n"
"%s authAuthEapStartsWhileAuthenticated=%d\n"
"%s authAuthEapLogoffWhileAuthenticated=%d\n",
prefix, prefix, auth_pae_state_txt(sm->auth_pae.state), prefix,
_SB(sm->auth_pae.eapolLogoff), _SB(sm->auth_pae.eapolStart),
_SB(sm->auth_pae.eapRestart), prefix,
port_type_txt(sm->auth_pae.portMode), sm->auth_pae.reAuthCount,
prefix, sm->auth_pae.quietPeriod, sm->auth_pae.reAuthMax,
prefix, sm->auth_pae.authEntersConnecting,
prefix, sm->auth_pae.authEapLogoffsWhileConnecting,
prefix, sm->auth_pae.authEntersAuthenticating,
prefix, sm->auth_pae.authAuthSuccessesWhileAuthenticating,
prefix, sm->auth_pae.authAuthTimeoutsWhileAuthenticating,
prefix, sm->auth_pae.authAuthFailWhileAuthenticating,
prefix, sm->auth_pae.authAuthEapStartsWhileAuthenticating,
prefix, sm->auth_pae.authAuthEapLogoffWhileAuthenticating,
prefix, sm->auth_pae.authAuthReauthsWhileAuthenticated,
prefix, sm->auth_pae.authAuthEapStartsWhileAuthenticated,
prefix, sm->auth_pae.authAuthEapLogoffWhileAuthenticated);
fprintf(f, "%s Backend Authentication:\n"
"%s state=%s\n"
"%s eapNoReq=%s eapReq=%s eapResp=%s\n"
"%s serverTimeout=%d\n"
"%s backendResponses=%d\n"
"%s backendAccessChallenges=%d\n"
"%s backendOtherRequestsToSupplicant=%d\n"
"%s backendAuthSuccesses=%d\n"
"%s backendAuthFails=%d\n",
prefix, prefix,
be_auth_state_txt(sm->be_auth.state),
prefix, _SB(sm->be_auth.eapNoReq), _SB(sm->be_auth.eapReq),
_SB(sm->be_auth.eapResp),
prefix, sm->be_auth.serverTimeout,
prefix, sm->be_auth.backendResponses,
prefix, sm->be_auth.backendAccessChallenges,
prefix, sm->be_auth.backendOtherRequestsToSupplicant,
prefix, sm->be_auth.backendAuthSuccesses,
prefix, sm->be_auth.backendAuthFails);
fprintf(f, "%s Reauthentication Timer:\n"
"%s state=%s\n"
"%s reAuthPeriod=%d reAuthEnabled=%s\n", prefix, prefix,
reauth_timer_state_txt(sm->reauth_timer.state), prefix,
sm->reauth_timer.reAuthPeriod,
_SB(sm->reauth_timer.reAuthEnabled));
fprintf(f, "%s Authenticator Key Transmit:\n"
"%s state=%s\n", prefix, prefix,
auth_key_tx_state_txt(sm->auth_key_tx.state));
fprintf(f, "%s Key Receive:\n"
"%s state=%s\n"
"%s rxKey=%s\n", prefix, prefix,
key_rx_state_txt(sm->key_rx.state),
prefix, _SB(sm->key_rx.rxKey));
fprintf(f, "%s Controlled Directions:\n"
"%s state=%s\n"
"%s adminControlledDirections=%s "
"operControlledDirections=%s\n"
"%s operEdge=%s\n", prefix, prefix,
ctrl_dir_state_txt(sm->ctrl_dir.state),
prefix, ctrl_dir_txt(sm->ctrl_dir.adminControlledDirections),
ctrl_dir_txt(sm->ctrl_dir.operControlledDirections),
prefix, _SB(sm->ctrl_dir.operEdge));
#undef _SB
}
#endif /* HOSTAPD_DUMP_STATE */
static Boolean eapol_sm_get_bool(void *ctx, enum eapol_bool_var variable)
{
struct eapol_state_machine *sm = ctx;
if (sm == NULL)
return FALSE;
switch (variable) {
case EAPOL_eapSuccess:
return sm->eapSuccess;
case EAPOL_eapRestart:
return sm->auth_pae.eapRestart;
case EAPOL_eapFail:
return sm->eapFail;
case EAPOL_eapResp:
return sm->be_auth.eapResp;
case EAPOL_eapReq:
return sm->be_auth.eapReq;
case EAPOL_eapNoReq:
return sm->be_auth.eapNoReq;
case EAPOL_portEnabled:
return sm->portEnabled;
case EAPOL_eapTimeout:
return sm->eapTimeout;
}
return FALSE;
}
static void eapol_sm_set_bool(void *ctx, enum eapol_bool_var variable,
Boolean value)
{
struct eapol_state_machine *sm = ctx;
if (sm == NULL)
return;
switch (variable) {
case EAPOL_eapSuccess:
sm->eapSuccess = value;
break;
case EAPOL_eapRestart:
sm->auth_pae.eapRestart = value;
break;
case EAPOL_eapFail:
sm->eapFail = value;
break;
case EAPOL_eapResp:
sm->be_auth.eapResp = value;
break;
case EAPOL_eapReq:
sm->be_auth.eapReq = value;
break;
case EAPOL_eapNoReq:
sm->be_auth.eapNoReq = value;
break;
case EAPOL_portEnabled:
sm->portEnabled = value;
break;
case EAPOL_eapTimeout:
sm->eapTimeout = value;
break;
}
}
static void eapol_sm_set_eapReqData(void *ctx, const u8 *eapReqData,
size_t eapReqDataLen)
{
struct eapol_state_machine *sm = ctx;
if (sm == NULL)
return;
free(sm->last_eap_radius);
sm->last_eap_radius = malloc(eapReqDataLen);
if (sm->last_eap_radius == NULL)
return;
memcpy(sm->last_eap_radius, eapReqData, eapReqDataLen);
sm->last_eap_radius_len = eapReqDataLen;
}
static void eapol_sm_set_eapKeyData(void *ctx, const u8 *eapKeyData,
size_t eapKeyDataLen)
{
struct eapol_state_machine *sm = ctx;
struct hostapd_data *hapd;
if (sm == NULL)
return;
hapd = sm->hapd;
if (eapKeyData && eapKeyDataLen >= 64) {
free(sm->eapol_key_sign);
free(sm->eapol_key_crypt);
sm->eapol_key_crypt = malloc(32);
if (sm->eapol_key_crypt) {
memcpy(sm->eapol_key_crypt, eapKeyData, 32);
sm->eapol_key_crypt_len = 32;
}
sm->eapol_key_sign = malloc(32);
if (sm->eapol_key_sign) {
memcpy(sm->eapol_key_sign, eapKeyData + 32, 32);
sm->eapol_key_sign_len = 32;
}
if (hapd->default_wep_key ||
hapd->conf->individual_wep_key_len > 0 ||
hapd->conf->wpa)
sm->keyAvailable = TRUE;
} else {
free(sm->eapol_key_sign);
free(sm->eapol_key_crypt);
sm->eapol_key_sign = NULL;
sm->eapol_key_crypt = NULL;
sm->eapol_key_sign_len = 0;
sm->eapol_key_crypt_len = 0;
sm->keyAvailable = FALSE;
}
}
static int eapol_sm_get_eap_user(void *ctx, const u8 *identity,
size_t identity_len, int phase2,
struct eap_user *user)
{
struct eapol_state_machine *sm = ctx;
const struct hostapd_eap_user *eap_user;
eap_user = hostapd_get_eap_user(sm->hapd->conf, identity,
identity_len, phase2);
if (eap_user == NULL)
return -1;
memset(user, 0, sizeof(*user));
user->phase2 = phase2;
memcpy(user->methods, eap_user->methods,
EAP_USER_MAX_METHODS > EAP_MAX_METHODS ?
EAP_USER_MAX_METHODS : EAP_MAX_METHODS);
if (eap_user->password) {
user->password = malloc(eap_user->password_len);
if (user->password == NULL)
return -1;
memcpy(user->password, eap_user->password,
eap_user->password_len);
user->password_len = eap_user->password_len;
}
user->force_version = eap_user->force_version;
return 0;
}
static const char * eapol_sm_get_eap_req_id_text(void *ctx, size_t *len)
{
struct eapol_state_machine *sm = ctx;
*len = sm->hapd->conf->eap_req_id_text_len;
return sm->hapd->conf->eap_req_id_text;
}
static struct eapol_callbacks eapol_cb =
{
.get_bool = eapol_sm_get_bool,
.set_bool = eapol_sm_set_bool,
.set_eapReqData = eapol_sm_set_eapReqData,
.set_eapKeyData = eapol_sm_set_eapKeyData,
.get_eap_user = eapol_sm_get_eap_user,
.get_eap_req_id_text = eapol_sm_get_eap_req_id_text,
};
Reference in New Issue View Git Blame Copy Permalink