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fragattacks/hostapd/eapol_sm.c
Jouni Malinen 1c6e69ccda Moved documentation from developer.txt into source code files 
Use Doxygen comments for functions to replace the old text file that was
not up-to-date anymore.
2009-01-08 16:33:00 +02:00

1343 lines
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/*
* hostapd / IEEE 802.1X-2004 Authenticator - EAPOL state machine
* Copyright (c) 2002-2008, 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 "hostapd.h"
#include "ieee802_1x.h"
#include "eapol_sm.h"
#include "eloop.h"
#include "wpa.h"
#include "preauth.h"
#include "sta_info.h"
#include "eap_server/eap.h"
#include "state_machine.h"
#include "eap_common/eap_common.h"
#define STATE_MACHINE_DATA struct eapol_state_machine
#define STATE_MACHINE_DEBUG_PREFIX "IEEE 802.1X"
#define STATE_MACHINE_ADDR sm->addr
static struct eapol_callbacks eapol_cb;
/* EAPOL state machines are described in IEEE Std 802.1X-2004, Chap. 8.2 */
#define setPortAuthorized() \
sm->eapol->cb.set_port_authorized(sm->hapd, sm->sta, 1)
#define setPortUnauthorized() \
sm->eapol->cb.set_port_authorized(sm->hapd, sm->sta, 0)
/* procedures */
#define txCannedFail() eapol_auth_tx_canned_eap(sm, 0)
#define txCannedSuccess() eapol_auth_tx_canned_eap(sm, 1)
#define txReq() eapol_auth_tx_req(sm)
#define abortAuth() sm->eapol->cb.abort_auth(sm->hapd, sm->sta)
#define txKey() sm->eapol->cb.tx_key(sm->hapd, sm->sta)
#define processKey() do { } while (0)
static void eapol_sm_step_run(struct eapol_state_machine *sm);
static void eapol_sm_step_cb(void *eloop_ctx, void *timeout_ctx);
static void eapol_auth_logger(struct eapol_authenticator *eapol,
const u8 *addr, logger_level level,
const char *txt)
{
if (eapol->cb.logger == NULL)
return;
eapol->cb.logger(eapol->conf.hapd, addr, level, txt);
}
static void eapol_auth_vlogger(struct eapol_authenticator *eapol,
const u8 *addr, logger_level level,
const char *fmt, ...)
{
char *format;
int maxlen;
va_list ap;
if (eapol->cb.logger == NULL)
return;
maxlen = os_strlen(fmt) + 100;
format = os_malloc(maxlen);
if (!format)
return;
va_start(ap, fmt);
vsnprintf(format, maxlen, fmt, ap);
va_end(ap);
eapol_auth_logger(eapol, addr, level, format);
os_free(format);
}
static void eapol_auth_tx_canned_eap(struct eapol_state_machine *sm,
int success)
{
struct eap_hdr eap;
os_memset(&eap, 0, sizeof(eap));
eap.code = success ? EAP_CODE_SUCCESS : EAP_CODE_FAILURE;
eap.identifier = ++sm->last_eap_id;
eap.length = host_to_be16(sizeof(eap));
eapol_auth_vlogger(sm->eapol, sm->addr, EAPOL_LOGGER_DEBUG,
"Sending canned EAP packet %s (identifier %d)",
success ? "SUCCESS" : "FAILURE", eap.identifier);
sm->eapol->cb.eapol_send(sm->hapd, sm->sta, IEEE802_1X_TYPE_EAP_PACKET,
(u8 *) &eap, sizeof(eap));
sm->dot1xAuthEapolFramesTx++;
}
static void eapol_auth_tx_req(struct eapol_state_machine *sm)
{
if (sm->eap_if->eapReqData == NULL ||
wpabuf_len(sm->eap_if->eapReqData) < sizeof(struct eap_hdr)) {
eapol_auth_logger(sm->eapol, sm->addr,
EAPOL_LOGGER_DEBUG,
"TxReq called, but there is no EAP request "
"from authentication server");
return;
}
if (sm->flags & EAPOL_SM_WAIT_START) {
wpa_printf(MSG_DEBUG, "EAPOL: Drop EAPOL TX to " MACSTR
" while waiting for EAPOL-Start",
MAC2STR(sm->addr));
return;
}
sm->last_eap_id = eap_get_id(sm->eap_if->eapReqData);
eapol_auth_vlogger(sm->eapol, sm->addr, EAPOL_LOGGER_DEBUG,
"Sending EAP Packet (identifier %d)",
sm->last_eap_id);
sm->eapol->cb.eapol_send(sm->hapd, sm->sta, IEEE802_1X_TYPE_EAP_PACKET,
wpabuf_head(sm->eap_if->eapReqData),
wpabuf_len(sm->eap_if->eapReqData));
sm->dot1xAuthEapolFramesTx++;
if (eap_get_type(sm->eap_if->eapReqData) == EAP_TYPE_IDENTITY)
sm->dot1xAuthEapolReqIdFramesTx++;
else
sm->dot1xAuthEapolReqFramesTx++;
}
/**
* eapol_port_timers_tick - Port Timers state machine
* @eloop_ctx: struct eapol_state_machine *
* @timeout_ctx: Not used
*
* This statemachine is 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));
}
}
if (state->eap_if->retransWhile > 0) {
state->eap_if->retransWhile--;
if (state->eap_if->retransWhile == 0) {
wpa_printf(MSG_DEBUG, "IEEE 802.1X: " MACSTR
" - (EAP) retransWhile --> 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_MA(AUTH_PAE, INITIALIZE, auth_pae);
sm->portMode = Auto;
}
SM_STATE(AUTH_PAE, DISCONNECTED)
{
int from_initialize = sm->auth_pae_state == AUTH_PAE_INITIALIZE;
if (sm->eapolLogoff) {
if (sm->auth_pae_state == AUTH_PAE_CONNECTING)
sm->authEapLogoffsWhileConnecting++;
else if (sm->auth_pae_state == AUTH_PAE_AUTHENTICATED)
sm->authAuthEapLogoffWhileAuthenticated++;
}
SM_ENTRY_MA(AUTH_PAE, DISCONNECTED, auth_pae);
sm->authPortStatus = Unauthorized;
setPortUnauthorized();
sm->reAuthCount = 0;
sm->eapolLogoff = FALSE;
if (!from_initialize) {
sm->eapol->cb.finished(sm->hapd, sm->sta, 0,
sm->flags & EAPOL_SM_PREAUTH);
}
}
SM_STATE(AUTH_PAE, RESTART)
{
if (sm->auth_pae_state == AUTH_PAE_AUTHENTICATED) {
if (sm->reAuthenticate)
sm->authAuthReauthsWhileAuthenticated++;
if (sm->eapolStart)
sm->authAuthEapStartsWhileAuthenticated++;
if (sm->eapolLogoff)
sm->authAuthEapLogoffWhileAuthenticated++;
}
SM_ENTRY_MA(AUTH_PAE, RESTART, auth_pae);
sm->eap_if->eapRestart = TRUE;
}
SM_STATE(AUTH_PAE, CONNECTING)
{
if (sm->auth_pae_state != AUTH_PAE_CONNECTING)
sm->authEntersConnecting++;
SM_ENTRY_MA(AUTH_PAE, CONNECTING, auth_pae);
sm->reAuthenticate = FALSE;
sm->reAuthCount++;
}
SM_STATE(AUTH_PAE, HELD)
{
if (sm->auth_pae_state == AUTH_PAE_AUTHENTICATING && sm->authFail)
sm->authAuthFailWhileAuthenticating++;
SM_ENTRY_MA(AUTH_PAE, HELD, auth_pae);
sm->authPortStatus = Unauthorized;
setPortUnauthorized();
sm->quietWhile = sm->quietPeriod;
sm->eapolLogoff = FALSE;
eapol_auth_vlogger(sm->eapol, sm->addr, EAPOL_LOGGER_WARNING,
"authentication failed - EAP type: %d (%s)",
sm->eap_type_authsrv,
eap_type_text(sm->eap_type_authsrv));
if (sm->eap_type_authsrv != sm->eap_type_supp) {
eapol_auth_vlogger(sm->eapol, sm->addr, EAPOL_LOGGER_INFO,
"Supplicant used different EAP type: "
"%d (%s)", sm->eap_type_supp,
eap_type_text(sm->eap_type_supp));
}
sm->eapol->cb.finished(sm->hapd, sm->sta, 0,
sm->flags & EAPOL_SM_PREAUTH);
}
SM_STATE(AUTH_PAE, AUTHENTICATED)
{
char *extra = "";
if (sm->auth_pae_state == AUTH_PAE_AUTHENTICATING && sm->authSuccess)
sm->authAuthSuccessesWhileAuthenticating++;
SM_ENTRY_MA(AUTH_PAE, AUTHENTICATED, auth_pae);
sm->authPortStatus = Authorized;
setPortAuthorized();
sm->reAuthCount = 0;
if (sm->flags & EAPOL_SM_PREAUTH)
extra = " (pre-authentication)";
else if (wpa_auth_sta_get_pmksa(sm->sta->wpa_sm))
extra = " (PMKSA cache)";
eapol_auth_vlogger(sm->eapol, sm->addr, EAPOL_LOGGER_INFO,
"authenticated - EAP type: %d (%s)%s",
sm->eap_type_authsrv,
eap_type_text(sm->eap_type_authsrv), extra);
sm->eapol->cb.finished(sm->hapd, sm->sta, 1,
sm->flags & EAPOL_SM_PREAUTH);
}
SM_STATE(AUTH_PAE, AUTHENTICATING)
{
SM_ENTRY_MA(AUTH_PAE, AUTHENTICATING, auth_pae);
sm->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->authAuthTimeoutsWhileAuthenticating++;
if (sm->eapolStart)
sm->authAuthEapStartsWhileAuthenticating++;
if (sm->eapolLogoff)
sm->authAuthEapLogoffWhileAuthenticating++;
}
SM_ENTRY_MA(AUTH_PAE, ABORTING, auth_pae);
sm->authAbort = TRUE;
sm->keyRun = FALSE;
sm->keyDone = FALSE;
}
SM_STATE(AUTH_PAE, FORCE_AUTH)
{
SM_ENTRY_MA(AUTH_PAE, FORCE_AUTH, auth_pae);
sm->authPortStatus = Authorized;
setPortAuthorized();
sm->portMode = ForceAuthorized;
sm->eapolStart = FALSE;
txCannedSuccess();
}
SM_STATE(AUTH_PAE, FORCE_UNAUTH)
{
SM_ENTRY_MA(AUTH_PAE, FORCE_UNAUTH, auth_pae);
sm->authPortStatus = Unauthorized;
setPortUnauthorized();
sm->portMode = ForceUnauthorized;
sm->eapolStart = FALSE;
txCannedFail();
}
SM_STEP(AUTH_PAE)
{
if ((sm->portControl == Auto && sm->portMode != sm->portControl) ||
sm->initialize || !sm->eap_if->portEnabled)
SM_ENTER_GLOBAL(AUTH_PAE, INITIALIZE);
else if (sm->portControl == ForceAuthorized &&
sm->portMode != sm->portControl &&
!(sm->initialize || !sm->eap_if->portEnabled))
SM_ENTER_GLOBAL(AUTH_PAE, FORCE_AUTH);
else if (sm->portControl == ForceUnauthorized &&
sm->portMode != sm->portControl &&
!(sm->initialize || !sm->eap_if->portEnabled))
SM_ENTER_GLOBAL(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->eap_if->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->eapolLogoff || sm->reAuthCount > sm->reAuthMax)
SM_ENTER(AUTH_PAE, DISCONNECTED);
else if ((sm->eap_if->eapReq &&
sm->reAuthCount <= sm->reAuthMax) ||
sm->eap_if->eapSuccess || sm->eap_if->eapFail)
SM_ENTER(AUTH_PAE, AUTHENTICATING);
break;
case AUTH_PAE_AUTHENTICATED:
if (sm->eapolStart || sm->reAuthenticate)
SM_ENTER(AUTH_PAE, RESTART);
else if (sm->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->eapolStart || sm->eapolLogoff ||
sm->authTimeout)
SM_ENTER(AUTH_PAE, ABORTING);
break;
case AUTH_PAE_ABORTING:
if (sm->eapolLogoff && !sm->authAbort)
SM_ENTER(AUTH_PAE, DISCONNECTED);
else if (!sm->eapolLogoff && !sm->authAbort)
SM_ENTER(AUTH_PAE, RESTART);
break;
case AUTH_PAE_FORCE_AUTH:
if (sm->eapolStart)
SM_ENTER(AUTH_PAE, FORCE_AUTH);
break;
case AUTH_PAE_FORCE_UNAUTH:
if (sm->eapolStart)
SM_ENTER(AUTH_PAE, FORCE_UNAUTH);
break;
}
}
}
/* Backend Authentication state machine */
SM_STATE(BE_AUTH, INITIALIZE)
{
SM_ENTRY_MA(BE_AUTH, INITIALIZE, be_auth);
abortAuth();
sm->eap_if->eapNoReq = FALSE;
sm->authAbort = FALSE;
}
SM_STATE(BE_AUTH, REQUEST)
{
SM_ENTRY_MA(BE_AUTH, REQUEST, be_auth);
txReq();
sm->eap_if->eapReq = FALSE;
sm->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_MA(BE_AUTH, RESPONSE, be_auth);
sm->authTimeout = FALSE;
sm->eapolEap = FALSE;
sm->eap_if->eapNoReq = FALSE;
sm->aWhile = sm->serverTimeout;
sm->eap_if->eapResp = TRUE;
/* sendRespToServer(); */
sm->backendResponses++;
}
SM_STATE(BE_AUTH, SUCCESS)
{
SM_ENTRY_MA(BE_AUTH, SUCCESS, be_auth);
txReq();
sm->authSuccess = TRUE;
sm->keyRun = TRUE;
}
SM_STATE(BE_AUTH, FAIL)
{
SM_ENTRY_MA(BE_AUTH, FAIL, be_auth);
txReq();
sm->authFail = TRUE;
}
SM_STATE(BE_AUTH, TIMEOUT)
{
SM_ENTRY_MA(BE_AUTH, TIMEOUT, be_auth);
sm->authTimeout = TRUE;
}
SM_STATE(BE_AUTH, IDLE)
{
SM_ENTRY_MA(BE_AUTH, IDLE, be_auth);
sm->authStart = FALSE;
}
SM_STATE(BE_AUTH, IGNORE)
{
SM_ENTRY_MA(BE_AUTH, IGNORE, be_auth);
sm->eap_if->eapNoReq = FALSE;
}
SM_STEP(BE_AUTH)
{
if (sm->portControl != Auto || sm->initialize || sm->authAbort) {
SM_ENTER_GLOBAL(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->eap_if->eapReq)
SM_ENTER(BE_AUTH, REQUEST);
else if (sm->eap_if->eapTimeout)
SM_ENTER(BE_AUTH, TIMEOUT);
break;
case BE_AUTH_RESPONSE:
if (sm->eap_if->eapNoReq)
SM_ENTER(BE_AUTH, IGNORE);
if (sm->eap_if->eapReq) {
sm->backendAccessChallenges++;
SM_ENTER(BE_AUTH, REQUEST);
} else if (sm->aWhile == 0)
SM_ENTER(BE_AUTH, TIMEOUT);
else if (sm->eap_if->eapFail) {
sm->backendAuthFails++;
SM_ENTER(BE_AUTH, FAIL);
} else if (sm->eap_if->eapSuccess) {
sm->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->eap_if->eapFail && sm->authStart)
SM_ENTER(BE_AUTH, FAIL);
else if (sm->eap_if->eapReq && sm->authStart)
SM_ENTER(BE_AUTH, REQUEST);
else if (sm->eap_if->eapSuccess && sm->authStart)
SM_ENTER(BE_AUTH, SUCCESS);
break;
case BE_AUTH_IGNORE:
if (sm->eapolEap)
SM_ENTER(BE_AUTH, RESPONSE);
else if (sm->eap_if->eapReq)
SM_ENTER(BE_AUTH, REQUEST);
else if (sm->eap_if->eapTimeout)
SM_ENTER(BE_AUTH, TIMEOUT);
break;
}
}
/* Reauthentication Timer state machine */
SM_STATE(REAUTH_TIMER, INITIALIZE)
{
SM_ENTRY_MA(REAUTH_TIMER, INITIALIZE, reauth_timer);
sm->reAuthWhen = sm->reAuthPeriod;
}
SM_STATE(REAUTH_TIMER, REAUTHENTICATE)
{
SM_ENTRY_MA(REAUTH_TIMER, REAUTHENTICATE, reauth_timer);
sm->reAuthenticate = TRUE;
wpa_auth_sm_event(sm->sta->wpa_sm, WPA_REAUTH_EAPOL);
}
SM_STEP(REAUTH_TIMER)
{
if (sm->portControl != Auto || sm->initialize ||
sm->authPortStatus == Unauthorized || !sm->reAuthEnabled) {
SM_ENTER_GLOBAL(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_MA(AUTH_KEY_TX, NO_KEY_TRANSMIT, auth_key_tx);
}
SM_STATE(AUTH_KEY_TX, KEY_TRANSMIT)
{
SM_ENTRY_MA(AUTH_KEY_TX, KEY_TRANSMIT, auth_key_tx);
txKey();
sm->eap_if->eapKeyAvailable = FALSE;
sm->keyDone = TRUE;
}
SM_STEP(AUTH_KEY_TX)
{
if (sm->initialize || sm->portControl != Auto) {
SM_ENTER_GLOBAL(AUTH_KEY_TX, NO_KEY_TRANSMIT);
return;
}
switch (sm->auth_key_tx_state) {
case AUTH_KEY_TX_NO_KEY_TRANSMIT:
if (sm->keyTxEnabled && sm->eap_if->eapKeyAvailable &&
sm->keyRun && !wpa_auth_sta_wpa_version(sm->sta->wpa_sm))
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->eap_if->eapKeyAvailable)
SM_ENTER(AUTH_KEY_TX, KEY_TRANSMIT);
break;
}
}
/* Key Receive state machine */
SM_STATE(KEY_RX, NO_KEY_RECEIVE)
{
SM_ENTRY_MA(KEY_RX, NO_KEY_RECEIVE, key_rx);
}
SM_STATE(KEY_RX, KEY_RECEIVE)
{
SM_ENTRY_MA(KEY_RX, KEY_RECEIVE, key_rx);
processKey();
sm->rxKey = FALSE;
}
SM_STEP(KEY_RX)
{
if (sm->initialize || !sm->eap_if->portEnabled) {
SM_ENTER_GLOBAL(KEY_RX, NO_KEY_RECEIVE);
return;
}
switch (sm->key_rx_state) {
case KEY_RX_NO_KEY_RECEIVE:
if (sm->rxKey)
SM_ENTER(KEY_RX, KEY_RECEIVE);
break;
case KEY_RX_KEY_RECEIVE:
if (sm->rxKey)
SM_ENTER(KEY_RX, KEY_RECEIVE);
break;
}
}
/* Controlled Directions state machine */
SM_STATE(CTRL_DIR, FORCE_BOTH)
{
SM_ENTRY_MA(CTRL_DIR, FORCE_BOTH, ctrl_dir);
sm->operControlledDirections = Both;
}
SM_STATE(CTRL_DIR, IN_OR_BOTH)
{
SM_ENTRY_MA(CTRL_DIR, IN_OR_BOTH, ctrl_dir);
sm->operControlledDirections = sm->adminControlledDirections;
}
SM_STEP(CTRL_DIR)
{
if (sm->initialize) {
SM_ENTER_GLOBAL(CTRL_DIR, IN_OR_BOTH);
return;
}
switch (sm->ctrl_dir_state) {
case CTRL_DIR_FORCE_BOTH:
if (sm->eap_if->portEnabled && sm->operEdge)
SM_ENTER(CTRL_DIR, IN_OR_BOTH);
break;
case CTRL_DIR_IN_OR_BOTH:
if (sm->operControlledDirections !=
sm->adminControlledDirections)
SM_ENTER(CTRL_DIR, IN_OR_BOTH);
if (!sm->eap_if->portEnabled || !sm->operEdge)
SM_ENTER(CTRL_DIR, FORCE_BOTH);
break;
}
}
struct eapol_state_machine *
eapol_auth_alloc(struct eapol_authenticator *eapol, const u8 *addr,
int preauth, struct sta_info *sta)
{
struct eapol_state_machine *sm;
struct hostapd_data *hapd; /* TODO: to be removed */
struct eap_config eap_conf;
if (eapol == NULL)
return NULL;
hapd = eapol->conf.hapd;
sm = os_zalloc(sizeof(*sm));
if (sm == NULL) {
wpa_printf(MSG_DEBUG, "IEEE 802.1X state machine allocation "
"failed");
return NULL;
}
sm->radius_identifier = -1;
os_memcpy(sm->addr, addr, ETH_ALEN);
if (preauth)
sm->flags |= EAPOL_SM_PREAUTH;
sm->hapd = hapd;
sm->eapol = eapol;
sm->sta = sta;
/* Set default values for state machine constants */
sm->auth_pae_state = AUTH_PAE_INITIALIZE;
sm->quietPeriod = AUTH_PAE_DEFAULT_quietPeriod;
sm->reAuthMax = AUTH_PAE_DEFAULT_reAuthMax;
sm->be_auth_state = BE_AUTH_INITIALIZE;
sm->serverTimeout = BE_AUTH_DEFAULT_serverTimeout;
sm->reauth_timer_state = REAUTH_TIMER_INITIALIZE;
sm->reAuthPeriod = eapol->conf.eap_reauth_period;
sm->reAuthEnabled = eapol->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->portControl = Auto;
if (!eapol->conf.wpa &&
(hapd->default_wep_key || eapol->conf.individual_wep_key_len > 0))
sm->keyTxEnabled = TRUE;
else
sm->keyTxEnabled = FALSE;
if (eapol->conf.wpa)
sm->portValid = FALSE;
else
sm->portValid = TRUE;
os_memset(&eap_conf, 0, sizeof(eap_conf));
eap_conf.eap_server = eapol->conf.eap_server;
eap_conf.ssl_ctx = eapol->conf.ssl_ctx;
eap_conf.eap_sim_db_priv = eapol->conf.eap_sim_db_priv;
eap_conf.pac_opaque_encr_key = eapol->conf.pac_opaque_encr_key;
eap_conf.eap_fast_a_id = eapol->conf.eap_fast_a_id;
eap_conf.eap_fast_a_id_len = eapol->conf.eap_fast_a_id_len;
eap_conf.eap_fast_a_id_info = eapol->conf.eap_fast_a_id_info;
eap_conf.eap_fast_prov = eapol->conf.eap_fast_prov;
eap_conf.pac_key_lifetime = eapol->conf.pac_key_lifetime;
eap_conf.pac_key_refresh_time = eapol->conf.pac_key_refresh_time;
eap_conf.eap_sim_aka_result_ind = eapol->conf.eap_sim_aka_result_ind;
eap_conf.tnc = eapol->conf.tnc;
eap_conf.wps = eapol->conf.wps;
eap_conf.assoc_wps_ie = sta->wps_ie;
sm->eap = eap_server_sm_init(sm, &eapol_cb, &eap_conf);
if (sm->eap == NULL) {
eapol_auth_free(sm);
return NULL;
}
sm->eap_if = eap_get_interface(sm->eap);
eapol_auth_initialize(sm);
return sm;
}
void eapol_auth_free(struct eapol_state_machine *sm)
{
if (sm == NULL)
return;
eloop_cancel_timeout(eapol_port_timers_tick, NULL, sm);
eloop_cancel_timeout(eapol_sm_step_cb, sm, NULL);
if (sm->eap)
eap_server_sm_deinit(sm->eap);
os_free(sm);
}
static int eapol_sm_sta_entry_alive(struct eapol_authenticator *eapol,
const u8 *addr)
{
return eapol->cb.sta_entry_alive(eapol->conf.hapd, addr);
}
static void eapol_sm_step_run(struct eapol_state_machine *sm)
{
struct eapol_authenticator *eapol = sm->eapol;
u8 addr[ETH_ALEN];
unsigned int prev_auth_pae, prev_be_auth, prev_reauth_timer,
prev_auth_key_tx, prev_key_rx, prev_ctrl_dir;
int max_steps = 100;
os_memcpy(addr, sm->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(eapol, addr))
SM_STEP_RUN(BE_AUTH);
if (sm->initializing || eapol_sm_sta_entry_alive(eapol, addr))
SM_STEP_RUN(REAUTH_TIMER);
if (sm->initializing || eapol_sm_sta_entry_alive(eapol, addr))
SM_STEP_RUN(AUTH_KEY_TX);
if (sm->initializing || eapol_sm_sta_entry_alive(eapol, addr))
SM_STEP_RUN(KEY_RX);
if (sm->initializing || eapol_sm_sta_entry_alive(eapol, 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_auth_step(sm);
return;
}
if (eapol_sm_sta_entry_alive(eapol, addr) && sm->eap) {
if (eap_server_sm_step(sm->eap)) {
if (--max_steps > 0)
goto restart;
/* Re-run from eloop timeout */
eapol_auth_step(sm);
return;
}
/* TODO: find a better location for this */
if (sm->eap_if->aaaEapResp) {
sm->eap_if->aaaEapResp = FALSE;
if (sm->eap_if->aaaEapRespData == NULL) {
wpa_printf(MSG_DEBUG, "EAPOL: aaaEapResp set, "
"but no aaaEapRespData available");
return;
}
sm->eapol->cb.aaa_send(
sm->hapd, sm->sta,
wpabuf_head(sm->eap_if->aaaEapRespData),
wpabuf_len(sm->eap_if->aaaEapRespData));
}
}
if (eapol_sm_sta_entry_alive(eapol, addr))
wpa_auth_sm_notify(sm->sta->wpa_sm);
}
static void eapol_sm_step_cb(void *eloop_ctx, void *timeout_ctx)
{
struct eapol_state_machine *sm = eloop_ctx;
eapol_sm_step_run(sm);
}
/**
* eapol_auth_step - Advance EAPOL state machines
* @sm: EAPOL state machine
*
* This function is called to advance EAPOL state machines after any change
* that could affect their state.
*/
void eapol_auth_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_auth_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, NULL, sm);
eloop_register_timeout(1, 0, eapol_port_timers_tick, NULL, 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_auth_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->eap_if->eapFail), _SB(sm->eapolEap),
prefix, _SB(sm->eap_if->eapSuccess),
_SB(sm->eap_if->eapTimeout),
_SB(sm->initialize), _SB(sm->eap_if->eapKeyAvailable),
prefix, _SB(sm->keyDone), _SB(sm->keyRun),
_SB(sm->keyTxEnabled), port_type_txt(sm->portControl),
prefix, _SB(sm->eap_if->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->eapolLogoff), _SB(sm->eapolStart),
_SB(sm->eap_if->eapRestart),
prefix, port_type_txt(sm->portMode), sm->reAuthCount,
prefix, sm->quietPeriod, sm->reAuthMax,
prefix, sm->authEntersConnecting,
prefix, sm->authEapLogoffsWhileConnecting,
prefix, sm->authEntersAuthenticating,
prefix, sm->authAuthSuccessesWhileAuthenticating,
prefix, sm->authAuthTimeoutsWhileAuthenticating,
prefix, sm->authAuthFailWhileAuthenticating,
prefix, sm->authAuthEapStartsWhileAuthenticating,
prefix, sm->authAuthEapLogoffWhileAuthenticating,
prefix, sm->authAuthReauthsWhileAuthenticated,
prefix, sm->authAuthEapStartsWhileAuthenticated,
prefix, sm->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->eap_if->eapNoReq), _SB(sm->eap_if->eapReq),
_SB(sm->eap_if->eapResp),
prefix, sm->serverTimeout,
prefix, sm->backendResponses,
prefix, sm->backendAccessChallenges,
prefix, sm->backendOtherRequestsToSupplicant,
prefix, sm->backendAuthSuccesses,
prefix, sm->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->reAuthPeriod, _SB(sm->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->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->adminControlledDirections),
ctrl_dir_txt(sm->operControlledDirections),
prefix, _SB(sm->operEdge));
#undef _SB
}
#endif /* HOSTAPD_DUMP_STATE */
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;
return sm->eapol->cb.get_eap_user(sm->hapd, identity, identity_len,
phase2, user);
}
static const char * eapol_sm_get_eap_req_id_text(void *ctx, size_t *len)
{
struct eapol_state_machine *sm = ctx;
*len = sm->eapol->conf.eap_req_id_text_len;
return sm->eapol->conf.eap_req_id_text;
}
static struct eapol_callbacks eapol_cb =
{
.get_eap_user = eapol_sm_get_eap_user,
.get_eap_req_id_text = eapol_sm_get_eap_req_id_text,
};
int eapol_auth_eap_pending_cb(struct eapol_state_machine *sm, void *ctx)
{
if (sm == NULL || ctx != sm->eap)
return -1;
eap_sm_pending_cb(sm->eap);
eapol_auth_step(sm);
return 0;
}
static int eapol_auth_conf_clone(struct eapol_auth_config *dst,
struct eapol_auth_config *src)
{
dst->hapd = src->hapd;
dst->eap_reauth_period = src->eap_reauth_period;
dst->wpa = src->wpa;
dst->individual_wep_key_len = src->individual_wep_key_len;
dst->eap_server = src->eap_server;
dst->ssl_ctx = src->ssl_ctx;
dst->eap_sim_db_priv = src->eap_sim_db_priv;
os_free(dst->eap_req_id_text);
if (src->eap_req_id_text) {
dst->eap_req_id_text = os_malloc(src->eap_req_id_text_len);
if (dst->eap_req_id_text == NULL)
return -1;
os_memcpy(dst->eap_req_id_text, src->eap_req_id_text,
src->eap_req_id_text_len);
dst->eap_req_id_text_len = src->eap_req_id_text_len;
} else {
dst->eap_req_id_text = NULL;
dst->eap_req_id_text_len = 0;
}
if (src->pac_opaque_encr_key) {
dst->pac_opaque_encr_key = os_malloc(16);
os_memcpy(dst->pac_opaque_encr_key, src->pac_opaque_encr_key,
16);
} else
dst->pac_opaque_encr_key = NULL;
if (src->eap_fast_a_id) {
dst->eap_fast_a_id = os_malloc(src->eap_fast_a_id_len);
if (dst->eap_fast_a_id == NULL) {
os_free(dst->eap_req_id_text);
return -1;
}
os_memcpy(dst->eap_fast_a_id, src->eap_fast_a_id,
src->eap_fast_a_id_len);
dst->eap_fast_a_id_len = src->eap_fast_a_id_len;
} else
dst->eap_fast_a_id = NULL;
if (src->eap_fast_a_id_info) {
dst->eap_fast_a_id_info = os_strdup(src->eap_fast_a_id_info);
if (dst->eap_fast_a_id_info == NULL) {
os_free(dst->eap_req_id_text);
os_free(dst->eap_fast_a_id);
return -1;
}
} else
dst->eap_fast_a_id_info = NULL;
dst->eap_fast_prov = src->eap_fast_prov;
dst->pac_key_lifetime = src->pac_key_lifetime;
dst->pac_key_refresh_time = src->pac_key_refresh_time;
dst->eap_sim_aka_result_ind = src->eap_sim_aka_result_ind;
dst->tnc = src->tnc;
dst->wps = src->wps;
return 0;
}
static void eapol_auth_conf_free(struct eapol_auth_config *conf)
{
os_free(conf->eap_req_id_text);
conf->eap_req_id_text = NULL;
os_free(conf->pac_opaque_encr_key);
conf->pac_opaque_encr_key = NULL;
os_free(conf->eap_fast_a_id);
conf->eap_fast_a_id = NULL;
os_free(conf->eap_fast_a_id_info);
conf->eap_fast_a_id_info = NULL;
}
struct eapol_authenticator * eapol_auth_init(struct eapol_auth_config *conf,
struct eapol_auth_cb *cb)
{
struct eapol_authenticator *eapol;
eapol = os_zalloc(sizeof(*eapol));
if (eapol == NULL)
return NULL;
if (eapol_auth_conf_clone(&eapol->conf, conf) < 0) {
os_free(eapol);
return NULL;
}
eapol->cb.eapol_send = cb->eapol_send;
eapol->cb.aaa_send = cb->aaa_send;
eapol->cb.finished = cb->finished;
eapol->cb.get_eap_user = cb->get_eap_user;
eapol->cb.sta_entry_alive = cb->sta_entry_alive;
eapol->cb.logger = cb->logger;
eapol->cb.set_port_authorized = cb->set_port_authorized;
eapol->cb.abort_auth = cb->abort_auth;
eapol->cb.tx_key = cb->tx_key;
return eapol;
}
void eapol_auth_deinit(struct eapol_authenticator *eapol)
{
if (eapol == NULL)
return;
eapol_auth_conf_free(&eapol->conf);
os_free(eapol);
}
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