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NetBSD/dist/wpa_supplicant/eapol_sm.c

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/*
* WPA Supplicant / EAPOL state machines
* Copyright (c) 2004-2005, 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 <string.h>
#include "common.h"
#include "eapol_sm.h"
#include "eap.h"
#include "eloop.h"
#include "wpa_supplicant.h"
#include "l2_packet.h"
#include "wpa.h"
#include "md5.h"
#include "rc4.h"
/* IEEE 802.1aa/D6.1 - Supplicant */
struct eapol_sm {
/* Timers */
unsigned int authWhile;
unsigned int heldWhile;
unsigned int startWhen;
unsigned int idleWhile; /* for EAP state machine */
/* Global variables */
Boolean eapFail;
Boolean eapolEap;
Boolean eapSuccess;
Boolean initialize;
Boolean keyDone;
Boolean keyRun;
PortControl portControl;
Boolean portEnabled;
PortStatus suppPortStatus; /* dot1xSuppControlledPortStatus */
Boolean portValid;
Boolean suppAbort;
Boolean suppFail;
Boolean suppStart;
Boolean suppSuccess;
Boolean suppTimeout;
/* Supplicant PAE state machine */
enum {
SUPP_PAE_UNKNOWN = 0,
SUPP_PAE_DISCONNECTED = 1,
SUPP_PAE_LOGOFF = 2,
SUPP_PAE_CONNECTING = 3,
SUPP_PAE_AUTHENTICATING = 4,
SUPP_PAE_AUTHENTICATED = 5,
/* unused(6) */
SUPP_PAE_HELD = 7,
SUPP_PAE_RESTART = 8,
SUPP_PAE_S_FORCE_AUTH = 9,
SUPP_PAE_S_FORCE_UNAUTH = 10
} SUPP_PAE_state; /* dot1xSuppPaeState */
/* Variables */
Boolean userLogoff;
Boolean logoffSent;
unsigned int startCount;
Boolean eapRestart;
PortControl sPortMode;
/* Constants */
unsigned int heldPeriod; /* dot1xSuppHeldPeriod */
unsigned int startPeriod; /* dot1xSuppStartPeriod */
unsigned int maxStart; /* dot1xSuppMaxStart */
/* Key Receive state machine */
enum {
KEY_RX_UNKNOWN = 0,
KEY_RX_NO_KEY_RECEIVE, KEY_RX_KEY_RECEIVE
} KEY_RX_state;
/* Variables */
Boolean rxKey;
/* Supplicant Backend state machine */
enum {
SUPP_BE_UNKNOWN = 0,
SUPP_BE_INITIALIZE = 1,
SUPP_BE_IDLE = 2,
SUPP_BE_REQUEST = 3,
SUPP_BE_RECEIVE = 4,
SUPP_BE_RESPONSE = 5,
SUPP_BE_FAIL = 6,
SUPP_BE_TIMEOUT = 7,
SUPP_BE_SUCCESS = 8
} SUPP_BE_state; /* dot1xSuppBackendPaeState */
/* Variables */
Boolean eapNoResp;
Boolean eapReq;
Boolean eapResp;
/* Constants */
unsigned int authPeriod; /* dot1xSuppAuthPeriod */
/* Statistics */
unsigned int dot1xSuppEapolFramesRx;
unsigned int dot1xSuppEapolFramesTx;
unsigned int dot1xSuppEapolStartFramesTx;
unsigned int dot1xSuppEapolLogoffFramesTx;
unsigned int dot1xSuppEapolRespFramesTx;
unsigned int dot1xSuppEapolReqIdFramesRx;
unsigned int dot1xSuppEapolReqFramesRx;
unsigned int dot1xSuppInvalidEapolFramesRx;
unsigned int dot1xSuppEapLengthErrorFramesRx;
unsigned int dot1xSuppLastEapolFrameVersion;
unsigned char dot1xSuppLastEapolFrameSource[6];
/* Miscellaneous variables (not defined in IEEE 802.1aa/D6.1) */
Boolean changed;
struct eap_sm *eap;
struct wpa_ssid *config;
Boolean initial_req;
u8 *last_rx_key;
size_t last_rx_key_len;
u8 *eapReqData; /* for EAP */
size_t eapReqDataLen; /* for EAP */
Boolean altAccept; /* for EAP */
Boolean altReject; /* for EAP */
Boolean replay_counter_valid;
u8 last_replay_counter[16];
struct eapol_config conf;
struct eapol_ctx *ctx;
enum { EAPOL_CB_IN_PROGRESS = 0, EAPOL_CB_SUCCESS, EAPOL_CB_FAILURE }
cb_status;
Boolean cached_pmk;
Boolean unicast_key_received, broadcast_key_received;
};
static void eapol_sm_txLogoff(struct eapol_sm *sm);
static void eapol_sm_txStart(struct eapol_sm *sm);
static void eapol_sm_processKey(struct eapol_sm *sm);
static void eapol_sm_getSuppRsp(struct eapol_sm *sm);
static void eapol_sm_txSuppRsp(struct eapol_sm *sm);
static void eapol_sm_abortSupp(struct eapol_sm *sm);
static void eapol_sm_abort_cached(struct eapol_sm *sm);
static void eapol_sm_step_timeout(void *eloop_ctx, void *timeout_ctx);
static struct eapol_callbacks eapol_cb;
/* Definitions for clarifying state machine implementation */
#define SM_STATE(machine, state) \
static void sm_ ## machine ## _ ## state ## _Enter(struct eapol_sm *sm, \
int global)
#define SM_ENTRY(machine, state) \
if (!global || sm->machine ## _state != machine ## _ ## state) { \
sm->changed = TRUE; \
wpa_printf(MSG_DEBUG, "EAPOL: " #machine " entering state " #state); \
} \
sm->machine ## _state = machine ## _ ## state;
#define SM_ENTER(machine, state) \
sm_ ## machine ## _ ## state ## _Enter(sm, 0)
#define SM_ENTER_GLOBAL(machine, state) \
sm_ ## machine ## _ ## state ## _Enter(sm, 1)
#define SM_STEP(machine) \
static void sm_ ## machine ## _Step(struct eapol_sm *sm)
#define SM_STEP_RUN(machine) sm_ ## machine ## _Step(sm)
/* 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_sm *sm = timeout_ctx;
if (sm->authWhile > 0)
sm->authWhile--;
if (sm->heldWhile > 0)
sm->heldWhile--;
if (sm->startWhen > 0)
sm->startWhen--;
if (sm->idleWhile > 0)
sm->idleWhile--;
wpa_printf(MSG_MSGDUMP, "EAPOL: Port Timers tick - authWhile=%d "
"heldWhile=%d startWhen=%d idleWhile=%d",
sm->authWhile, sm->heldWhile, sm->startWhen, sm->idleWhile);
eloop_register_timeout(1, 0, eapol_port_timers_tick, eloop_ctx, sm);
eapol_sm_step(sm);
}
SM_STATE(SUPP_PAE, LOGOFF)
{
SM_ENTRY(SUPP_PAE, LOGOFF);
eapol_sm_txLogoff(sm);
sm->logoffSent = TRUE;
sm->suppPortStatus = Unauthorized;
}
SM_STATE(SUPP_PAE, DISCONNECTED)
{
SM_ENTRY(SUPP_PAE, DISCONNECTED);
sm->sPortMode = Auto;
sm->startCount = 0;
sm->logoffSent = FALSE;
sm->suppPortStatus = Unauthorized;
sm->suppAbort = TRUE;
sm->unicast_key_received = FALSE;
sm->broadcast_key_received = FALSE;
}
SM_STATE(SUPP_PAE, CONNECTING)
{
SM_ENTRY(SUPP_PAE, CONNECTING);
sm->startWhen = sm->startPeriod;
sm->startCount++;
sm->eapolEap = FALSE;
eapol_sm_txStart(sm);
}
SM_STATE(SUPP_PAE, AUTHENTICATING)
{
SM_ENTRY(SUPP_PAE, AUTHENTICATING);
sm->startCount = 0;
sm->suppSuccess = FALSE;
sm->suppFail = FALSE;
sm->suppTimeout = FALSE;
sm->keyRun = FALSE;
sm->keyDone = FALSE;
sm->suppStart = TRUE;
}
SM_STATE(SUPP_PAE, HELD)
{
SM_ENTRY(SUPP_PAE, HELD);
sm->heldWhile = sm->heldPeriod;
sm->suppPortStatus = Unauthorized;
sm->cb_status = EAPOL_CB_FAILURE;
}
SM_STATE(SUPP_PAE, AUTHENTICATED)
{
SM_ENTRY(SUPP_PAE, AUTHENTICATED);
sm->suppPortStatus = Authorized;
sm->cb_status = EAPOL_CB_SUCCESS;
}
SM_STATE(SUPP_PAE, RESTART)
{
SM_ENTRY(SUPP_PAE, RESTART);
sm->eapRestart = TRUE;
}
SM_STATE(SUPP_PAE, S_FORCE_AUTH)
{
SM_ENTRY(SUPP_PAE, S_FORCE_AUTH);
sm->suppPortStatus = Authorized;
sm->sPortMode = ForceAuthorized;
}
SM_STATE(SUPP_PAE, S_FORCE_UNAUTH)
{
SM_ENTRY(SUPP_PAE, S_FORCE_UNAUTH);
sm->suppPortStatus = Unauthorized;
sm->sPortMode = ForceUnauthorized;
eapol_sm_txLogoff(sm);
}
SM_STEP(SUPP_PAE)
{
if ((sm->userLogoff && !sm->logoffSent) &&
!(sm->initialize || !sm->portEnabled))
SM_ENTER_GLOBAL(SUPP_PAE, LOGOFF);
else if (((sm->portControl == Auto) &&
(sm->sPortMode != sm->portControl)) ||
sm->initialize || !sm->portEnabled)
SM_ENTER_GLOBAL(SUPP_PAE, DISCONNECTED);
else if ((sm->portControl == ForceAuthorized) &&
(sm->sPortMode != sm->portControl) &&
!(sm->initialize || !sm->portEnabled))
SM_ENTER_GLOBAL(SUPP_PAE, S_FORCE_AUTH);
else if ((sm->portControl == ForceUnauthorized) &&
(sm->sPortMode != sm->portControl) &&
!(sm->initialize || !sm->portEnabled))
SM_ENTER_GLOBAL(SUPP_PAE, S_FORCE_UNAUTH);
else switch (sm->SUPP_PAE_state) {
case SUPP_PAE_UNKNOWN:
break;
case SUPP_PAE_LOGOFF:
if (!sm->userLogoff)
SM_ENTER(SUPP_PAE, DISCONNECTED);
break;
case SUPP_PAE_DISCONNECTED:
SM_ENTER(SUPP_PAE, CONNECTING);
break;
case SUPP_PAE_CONNECTING:
if (sm->startWhen == 0 && sm->startCount < sm->maxStart)
SM_ENTER(SUPP_PAE, CONNECTING);
else if (sm->startWhen == 0 &&
sm->startCount >= sm->maxStart &&
sm->portValid)
SM_ENTER(SUPP_PAE, AUTHENTICATED);
else if (sm->eapSuccess || sm->eapFail)
SM_ENTER(SUPP_PAE, AUTHENTICATING);
else if (sm->eapolEap)
SM_ENTER(SUPP_PAE, RESTART);
else if (sm->startWhen == 0 &&
sm->startCount >= sm->maxStart &&
!sm->portValid)
SM_ENTER(SUPP_PAE, HELD);
break;
case SUPP_PAE_AUTHENTICATING:
if (sm->eapSuccess && !sm->portValid &&
sm->conf.accept_802_1x_keys &&
sm->conf.required_keys == 0) {
wpa_printf(MSG_DEBUG, "EAPOL: IEEE 802.1X for "
"plaintext connection; no EAPOL-Key frames "
"required");
sm->portValid = TRUE;
if (sm->ctx->eapol_done_cb)
sm->ctx->eapol_done_cb(sm->ctx->ctx);
}
if (sm->eapSuccess && sm->portValid)
SM_ENTER(SUPP_PAE, AUTHENTICATED);
else if (sm->eapFail || (sm->keyDone && !sm->portValid))
SM_ENTER(SUPP_PAE, HELD);
else if (sm->suppTimeout)
SM_ENTER(SUPP_PAE, CONNECTING);
break;
case SUPP_PAE_HELD:
if (sm->heldWhile == 0)
SM_ENTER(SUPP_PAE, CONNECTING);
else if (sm->eapolEap)
SM_ENTER(SUPP_PAE, RESTART);
break;
case SUPP_PAE_AUTHENTICATED:
if (sm->eapolEap && sm->portValid)
SM_ENTER(SUPP_PAE, RESTART);
else if (!sm->portValid)
SM_ENTER(SUPP_PAE, DISCONNECTED);
break;
case SUPP_PAE_RESTART:
if (!sm->eapRestart)
SM_ENTER(SUPP_PAE, AUTHENTICATING);
break;
case SUPP_PAE_S_FORCE_AUTH:
break;
case SUPP_PAE_S_FORCE_UNAUTH:
break;
}
}
SM_STATE(KEY_RX, NO_KEY_RECEIVE)
{
SM_ENTRY(KEY_RX, NO_KEY_RECEIVE);
}
SM_STATE(KEY_RX, KEY_RECEIVE)
{
SM_ENTRY(KEY_RX, KEY_RECEIVE);
eapol_sm_processKey(sm);
sm->rxKey = FALSE;
}
SM_STEP(KEY_RX)
{
if (sm->initialize || !sm->portEnabled)
SM_ENTER_GLOBAL(KEY_RX, NO_KEY_RECEIVE);
switch (sm->KEY_RX_state) {
case KEY_RX_UNKNOWN:
break;
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;
}
}
SM_STATE(SUPP_BE, REQUEST)
{
SM_ENTRY(SUPP_BE, REQUEST);
sm->authWhile = 0;
sm->eapReq = TRUE;
eapol_sm_getSuppRsp(sm);
}
SM_STATE(SUPP_BE, RESPONSE)
{
SM_ENTRY(SUPP_BE, RESPONSE);
eapol_sm_txSuppRsp(sm);
sm->eapResp = FALSE;
}
SM_STATE(SUPP_BE, SUCCESS)
{
SM_ENTRY(SUPP_BE, SUCCESS);
sm->keyRun = TRUE;
sm->suppSuccess = TRUE;
if (eap_key_available(sm->eap)) {
/* New key received - clear IEEE 802.1X EAPOL-Key replay
* counter */
sm->replay_counter_valid = FALSE;
}
}
SM_STATE(SUPP_BE, FAIL)
{
SM_ENTRY(SUPP_BE, FAIL);
sm->suppFail = TRUE;
}
SM_STATE(SUPP_BE, TIMEOUT)
{
SM_ENTRY(SUPP_BE, TIMEOUT);
sm->suppTimeout = TRUE;
}
SM_STATE(SUPP_BE, IDLE)
{
SM_ENTRY(SUPP_BE, IDLE);
sm->suppStart = FALSE;
sm->initial_req = TRUE;
}
SM_STATE(SUPP_BE, INITIALIZE)
{
SM_ENTRY(SUPP_BE, INITIALIZE);
eapol_sm_abortSupp(sm);
sm->suppAbort = FALSE;
}
SM_STATE(SUPP_BE, RECEIVE)
{
SM_ENTRY(SUPP_BE, RECEIVE);
sm->authWhile = sm->authPeriod;
sm->eapolEap = FALSE;
sm->eapNoResp = FALSE;
sm->initial_req = FALSE;
}
SM_STEP(SUPP_BE)
{
if (sm->initialize || sm->suppAbort)
SM_ENTER_GLOBAL(SUPP_BE, INITIALIZE);
else switch (sm->SUPP_BE_state) {
case SUPP_BE_UNKNOWN:
break;
case SUPP_BE_REQUEST:
if (sm->eapResp && sm->eapNoResp) {
wpa_printf(MSG_DEBUG, "EAPOL: SUPP_BE REQUEST: both "
"eapResp and eapNoResp set?!");
}
if (sm->eapResp)
SM_ENTER(SUPP_BE, RESPONSE);
else if (sm->eapNoResp)
SM_ENTER(SUPP_BE, RECEIVE);
break;
case SUPP_BE_RESPONSE:
SM_ENTER(SUPP_BE, RECEIVE);
break;
case SUPP_BE_SUCCESS:
SM_ENTER(SUPP_BE, IDLE);
break;
case SUPP_BE_FAIL:
SM_ENTER(SUPP_BE, IDLE);
break;
case SUPP_BE_TIMEOUT:
SM_ENTER(SUPP_BE, IDLE);
break;
case SUPP_BE_IDLE:
if (sm->eapFail && sm->suppStart)
SM_ENTER(SUPP_BE, FAIL);
else if (sm->eapolEap && sm->suppStart)
SM_ENTER(SUPP_BE, REQUEST);
else if (sm->eapSuccess && sm->suppStart)
SM_ENTER(SUPP_BE, SUCCESS);
break;
case SUPP_BE_INITIALIZE:
SM_ENTER(SUPP_BE, IDLE);
break;
case SUPP_BE_RECEIVE:
if (sm->eapolEap)
SM_ENTER(SUPP_BE, REQUEST);
else if (sm->eapFail)
SM_ENTER(SUPP_BE, FAIL);
else if (sm->authWhile == 0)
SM_ENTER(SUPP_BE, TIMEOUT);
else if (sm->eapSuccess)
SM_ENTER(SUPP_BE, SUCCESS);
break;
}
}
static void eapol_sm_txLogoff(struct eapol_sm *sm)
{
wpa_printf(MSG_DEBUG, "EAPOL: txLogoff");
sm->ctx->eapol_send(sm->ctx->ctx, IEEE802_1X_TYPE_EAPOL_LOGOFF,
(u8 *) "", 0);
sm->dot1xSuppEapolLogoffFramesTx++;
sm->dot1xSuppEapolFramesTx++;
}
static void eapol_sm_txStart(struct eapol_sm *sm)
{
wpa_printf(MSG_DEBUG, "EAPOL: txStart");
sm->ctx->eapol_send(sm->ctx->ctx, IEEE802_1X_TYPE_EAPOL_START,
(u8 *) "", 0);
sm->dot1xSuppEapolStartFramesTx++;
sm->dot1xSuppEapolFramesTx++;
}
#define IEEE8021X_ENCR_KEY_LEN 32
#define IEEE8021X_SIGN_KEY_LEN 32
struct eap_key_data {
u8 encr_key[IEEE8021X_ENCR_KEY_LEN];
u8 sign_key[IEEE8021X_SIGN_KEY_LEN];
};
static void eapol_sm_processKey(struct eapol_sm *sm)
{
struct ieee802_1x_hdr *hdr;
struct ieee802_1x_eapol_key *key;
struct eap_key_data keydata;
u8 orig_key_sign[IEEE8021X_KEY_SIGN_LEN], datakey[32];
u8 ekey[IEEE8021X_KEY_IV_LEN + IEEE8021X_ENCR_KEY_LEN];
int key_len, res, sign_key_len, encr_key_len;
wpa_printf(MSG_DEBUG, "EAPOL: processKey");
if (sm->last_rx_key == NULL)
return;
if (!sm->conf.accept_802_1x_keys) {
wpa_printf(MSG_WARNING, "EAPOL: Received IEEE 802.1X EAPOL-Key"
" even though this was not accepted - "
"ignoring this packet");
return;
}
hdr = (struct ieee802_1x_hdr *) sm->last_rx_key;
key = (struct ieee802_1x_eapol_key *) (hdr + 1);
if (sizeof(*hdr) + be_to_host16(hdr->length) > sm->last_rx_key_len) {
wpa_printf(MSG_WARNING, "EAPOL: Too short EAPOL-Key frame");
return;
}
wpa_printf(MSG_DEBUG, "EAPOL: RX IEEE 802.1X ver=%d type=%d len=%d "
"EAPOL-Key: type=%d key_length=%d key_index=0x%x",
hdr->version, hdr->type, be_to_host16(hdr->length),
key->type, be_to_host16(key->key_length), key->key_index);
sign_key_len = IEEE8021X_SIGN_KEY_LEN;
encr_key_len = IEEE8021X_ENCR_KEY_LEN;
res = eapol_sm_get_key(sm, (u8 *) &keydata, sizeof(keydata));
if (res < 0) {
wpa_printf(MSG_DEBUG, "EAPOL: Could not get master key for "
"decrypting EAPOL-Key keys");
return;
}
if (res == 16) {
/* LEAP derives only 16 bytes of keying material. */
res = eapol_sm_get_key(sm, (u8 *) &keydata, 16);
if (res) {
wpa_printf(MSG_DEBUG, "EAPOL: Could not get LEAP "
"master key for decrypting EAPOL-Key keys");
return;
}
sign_key_len = 16;
encr_key_len = 16;
memcpy(keydata.sign_key, keydata.encr_key, 16);
} else if (res) {
wpa_printf(MSG_DEBUG, "EAPOL: Could not get enough master key "
"data for decrypting EAPOL-Key keys (res=%d)", res);
return;
}
/* The key replay_counter must increase when same master key */
if (sm->replay_counter_valid &&
memcmp(sm->last_replay_counter, key->replay_counter,
IEEE8021X_REPLAY_COUNTER_LEN) >= 0) {
wpa_printf(MSG_WARNING, "EAPOL: EAPOL-Key replay counter did "
"not increase - ignoring key");
wpa_hexdump(MSG_DEBUG, "EAPOL: last replay counter",
sm->last_replay_counter,
IEEE8021X_REPLAY_COUNTER_LEN);
wpa_hexdump(MSG_DEBUG, "EAPOL: received replay counter",
key->replay_counter, IEEE8021X_REPLAY_COUNTER_LEN);
return;
}
/* Verify key signature (HMAC-MD5) */
memcpy(orig_key_sign, key->key_signature, IEEE8021X_KEY_SIGN_LEN);
memset(key->key_signature, 0, IEEE8021X_KEY_SIGN_LEN);
hmac_md5(keydata.sign_key, sign_key_len,
sm->last_rx_key, sizeof(*hdr) + be_to_host16(hdr->length),
key->key_signature);
if (memcmp(orig_key_sign, key->key_signature, IEEE8021X_KEY_SIGN_LEN)
!= 0) {
wpa_printf(MSG_DEBUG, "EAPOL: Invalid key signature in "
"EAPOL-Key packet");
memcpy(key->key_signature, orig_key_sign,
IEEE8021X_KEY_SIGN_LEN);
return;
}
wpa_printf(MSG_DEBUG, "EAPOL: EAPOL-Key key signature verified");
key_len = be_to_host16(hdr->length) - sizeof(*key);
if (key_len > 32 || be_to_host16(key->key_length) > 32) {
wpa_printf(MSG_WARNING, "EAPOL: Too long key data length %d",
key_len ? key_len : be_to_host16(key->key_length));
return;
}
if (key_len == be_to_host16(key->key_length)) {
memcpy(ekey, key->key_iv, IEEE8021X_KEY_IV_LEN);
memcpy(ekey + IEEE8021X_KEY_IV_LEN, keydata.encr_key,
encr_key_len);
memcpy(datakey, key + 1, key_len);
rc4(datakey, key_len, ekey,
IEEE8021X_KEY_IV_LEN + encr_key_len);
wpa_hexdump_key(MSG_DEBUG, "EAPOL: Decrypted(RC4) key",
datakey, key_len);
} else if (key_len == 0) {
/* IEEE 802.1X-REV specifies that least significant Key Length
* octets from MS-MPPE-Send-Key are used as the key if the key
* data is not present. This seems to be meaning the beginning
* of the MS-MPPE-Send-Key. In addition, MS-MPPE-Send-Key in
* Supplicant corresponds to MS-MPPE-Recv-Key in Authenticator.
* Anyway, taking the beginning of the keying material from EAP
* seems to interoperate with Authenticators. */
key_len = be_to_host16(key->key_length);
memcpy(datakey, keydata.encr_key, key_len);
wpa_hexdump_key(MSG_DEBUG, "EAPOL: using part of EAP keying "
"material data encryption key",
datakey, key_len);
} else {
wpa_printf(MSG_DEBUG, "EAPOL: Invalid key data length %d "
"(key_length=%d)", key_len,
be_to_host16(key->key_length));
return;
}
sm->replay_counter_valid = TRUE;
memcpy(sm->last_replay_counter, key->replay_counter,
IEEE8021X_REPLAY_COUNTER_LEN);
wpa_printf(MSG_DEBUG, "EAPOL: Setting dynamic WEP key: %s keyidx %d "
"len %d",
key->key_index & IEEE8021X_KEY_INDEX_FLAG ?
"unicast" : "broadcast",
key->key_index & IEEE8021X_KEY_INDEX_MASK, key_len);
if (sm->ctx->set_wep_key &&
sm->ctx->set_wep_key(sm->ctx->ctx,
key->key_index & IEEE8021X_KEY_INDEX_FLAG,
key->key_index & IEEE8021X_KEY_INDEX_MASK,
datakey, key_len) < 0) {
wpa_printf(MSG_WARNING, "EAPOL: Failed to set WEP key to the "
" driver.");
} else {
if (key->key_index & IEEE8021X_KEY_INDEX_FLAG)
sm->unicast_key_received = TRUE;
else
sm->broadcast_key_received = TRUE;
if ((sm->unicast_key_received ||
!(sm->conf.required_keys & EAPOL_REQUIRE_KEY_UNICAST)) &&
(sm->broadcast_key_received ||
!(sm->conf.required_keys & EAPOL_REQUIRE_KEY_BROADCAST)))
{
wpa_printf(MSG_DEBUG, "EAPOL: all required EAPOL-Key "
"frames received");
sm->portValid = TRUE;
if (sm->ctx->eapol_done_cb)
sm->ctx->eapol_done_cb(sm->ctx->ctx);
}
}
}
static void eapol_sm_getSuppRsp(struct eapol_sm *sm)
{
wpa_printf(MSG_DEBUG, "EAPOL: getSuppRsp");
/* EAP layer processing; no special code is needed, since Supplicant
* Backend state machine is waiting for eapNoResp or eapResp to be set
* and these are only set in the EAP state machine when the processing
* has finished. */
}
static void eapol_sm_txSuppRsp(struct eapol_sm *sm)
{
u8 *resp;
size_t resp_len;
wpa_printf(MSG_DEBUG, "EAPOL: txSuppRsp");
resp = eap_get_eapRespData(sm->eap, &resp_len);
if (resp == NULL) {
wpa_printf(MSG_WARNING, "EAPOL: txSuppRsp - EAP response data "
"not available");
return;
}
/* Send EAP-Packet from the EAP layer to the Authenticator */
sm->ctx->eapol_send(sm->ctx->ctx, IEEE802_1X_TYPE_EAP_PACKET,
resp, resp_len);
/* eapRespData is not used anymore, so free it here */
free(resp);
if (sm->initial_req)
sm->dot1xSuppEapolReqIdFramesRx++;
else
sm->dot1xSuppEapolReqFramesRx++;
sm->dot1xSuppEapolRespFramesTx++;
sm->dot1xSuppEapolFramesTx++;
}
static void eapol_sm_abortSupp(struct eapol_sm *sm)
{
/* release system resources that may have been allocated for the
* authentication session */
free(sm->last_rx_key);
sm->last_rx_key = NULL;
free(sm->eapReqData);
sm->eapReqData = NULL;
eap_sm_abort(sm->eap);
}
struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx)
{
struct eapol_sm *sm;
sm = malloc(sizeof(*sm));
if (sm == NULL)
return NULL;
memset(sm, 0, sizeof(*sm));
sm->ctx = ctx;
sm->portControl = Auto;
/* Supplicant PAE state machine */
sm->heldPeriod = 60;
sm->startPeriod = 30;
sm->maxStart = 3;
/* Supplicant Backend state machine */
sm->authPeriod = 30;
sm->eap = eap_sm_init(sm, &eapol_cb, sm->ctx->msg_ctx);
if (sm->eap == NULL) {
free(sm);
return NULL;
}
/* Initialize EAPOL state machines */
sm->initialize = TRUE;
eapol_sm_step(sm);
sm->initialize = FALSE;
eapol_sm_step(sm);
eloop_register_timeout(1, 0, eapol_port_timers_tick, NULL, sm);
return sm;
}
void eapol_sm_deinit(struct eapol_sm *sm)
{
if (sm == NULL)
return;
eloop_cancel_timeout(eapol_sm_step_timeout, NULL, sm);
eloop_cancel_timeout(eapol_port_timers_tick, NULL, sm);
eap_sm_deinit(sm->eap);
free(sm->last_rx_key);
free(sm->eapReqData);
free(sm->ctx);
free(sm);
}
static void eapol_sm_step_timeout(void *eloop_ctx, void *timeout_ctx)
{
eapol_sm_step(timeout_ctx);
}
void eapol_sm_step(struct eapol_sm *sm)
{
int i;
/* In theory, it should be ok to run this in loop until !changed.
* However, it is better to use a limit on number of iterations to
* allow events (e.g., SIGTERM) to stop the program cleanly if the
* state machine were to generate a busy loop. */
for (i = 0; i < 100; i++) {
sm->changed = FALSE;
SM_STEP_RUN(SUPP_PAE);
SM_STEP_RUN(KEY_RX);
SM_STEP_RUN(SUPP_BE);
if (eap_sm_step(sm->eap))
sm->changed = TRUE;
}
if (sm->changed) {
/* restart EAPOL state machine step from timeout call in order
* to allow other events to be processed. */
eloop_cancel_timeout(eapol_sm_step_timeout, NULL, sm);
eloop_register_timeout(0, 0, eapol_sm_step_timeout, NULL, sm);
}
if (sm->ctx->cb && sm->cb_status != EAPOL_CB_IN_PROGRESS) {
int success = sm->cb_status == EAPOL_CB_SUCCESS ? 1 : 0;
sm->cb_status = EAPOL_CB_IN_PROGRESS;
sm->ctx->cb(sm, success, sm->ctx->cb_ctx);
}
}
static const char *eapol_supp_pae_state(int state)
{
switch (state) {
case SUPP_PAE_LOGOFF:
return "LOGOFF";
case SUPP_PAE_DISCONNECTED:
return "DISCONNECTED";
case SUPP_PAE_CONNECTING:
return "CONNECTING";
case SUPP_PAE_AUTHENTICATING:
return "AUTHENTICATING";
case SUPP_PAE_HELD:
return "HELD";
case SUPP_PAE_AUTHENTICATED:
return "AUTHENTICATED";
case SUPP_PAE_RESTART:
return "RESTART";
default:
return "UNKNOWN";
}
}
static const char *eapol_supp_be_state(int state)
{
switch (state) {
case SUPP_BE_REQUEST:
return "REQUEST";
case SUPP_BE_RESPONSE:
return "RESPONSE";
case SUPP_BE_SUCCESS:
return "SUCCESS";
case SUPP_BE_FAIL:
return "FAIL";
case SUPP_BE_TIMEOUT:
return "TIMEOUT";
case SUPP_BE_IDLE:
return "IDLE";
case SUPP_BE_INITIALIZE:
return "INITIALIZE";
case SUPP_BE_RECEIVE:
return "RECEIVE";
default:
return "UNKNOWN";
}
}
static const char * eapol_port_status(PortStatus status)
{
if (status == Authorized)
return "Authorized";
else
return "Unauthorized";
}
static const char * eapol_port_control(PortControl ctrl)
{
switch (ctrl) {
case Auto:
return "Auto";
case ForceUnauthorized:
return "ForceUnauthorized";
case ForceAuthorized:
return "ForceAuthorized";
default:
return "Unknown";
}
}
void eapol_sm_configure(struct eapol_sm *sm, int heldPeriod, int authPeriod,
int startPeriod, int maxStart)
{
if (sm == NULL)
return;
if (heldPeriod >= 0)
sm->heldPeriod = heldPeriod;
if (authPeriod >= 0)
sm->authPeriod = authPeriod;
if (startPeriod >= 0)
sm->startPeriod = startPeriod;
if (maxStart >= 0)
sm->maxStart = maxStart;
}
int eapol_sm_get_status(struct eapol_sm *sm, char *buf, size_t buflen,
int verbose)
{
int len;
if (sm == NULL)
return 0;
len = snprintf(buf, buflen,
"Supplicant PAE state=%s\n"
"suppPortStatus=%s\n",
eapol_supp_pae_state(sm->SUPP_PAE_state),
eapol_port_status(sm->suppPortStatus));
if (verbose) {
len += snprintf(buf + len, buflen - len,
"heldPeriod=%d\n"
"authPeriod=%d\n"
"startPeriod=%d\n"
"maxStart=%d\n"
"portControl=%s\n"
"Supplicant Backend state=%s\n",
sm->heldPeriod,
sm->authPeriod,
sm->startPeriod,
sm->maxStart,
eapol_port_control(sm->portControl),
eapol_supp_be_state(sm->SUPP_BE_state));
}
len += eap_sm_get_status(sm->eap, buf + len, buflen - len, verbose);
return len;
}
int eapol_sm_get_mib(struct eapol_sm *sm, char *buf, size_t buflen)
{
int len;
if (sm == NULL)
return 0;
len = snprintf(buf, buflen,
"dot1xSuppPaeState=%d\n"
"dot1xSuppHeldPeriod=%d\n"
"dot1xSuppAuthPeriod=%d\n"
"dot1xSuppStartPeriod=%d\n"
"dot1xSuppMaxStart=%d\n"
"dot1xSuppSuppControlledPortStatus=%s\n"
"dot1xSuppBackendPaeState=%d\n"
"dot1xSuppEapolFramesRx=%d\n"
"dot1xSuppEapolFramesTx=%d\n"
"dot1xSuppEapolStartFramesTx=%d\n"
"dot1xSuppEapolLogoffFramesTx=%d\n"
"dot1xSuppEapolRespFramesTx=%d\n"
"dot1xSuppEapolReqIdFramesRx=%d\n"
"dot1xSuppEapolReqFramesRx=%d\n"
"dot1xSuppInvalidEapolFramesRx=%d\n"
"dot1xSuppEapLengthErrorFramesRx=%d\n"
"dot1xSuppLastEapolFrameVersion=%d\n"
"dot1xSuppLastEapolFrameSource=" MACSTR "\n",
sm->SUPP_PAE_state,
sm->heldPeriod,
sm->authPeriod,
sm->startPeriod,
sm->maxStart,
sm->suppPortStatus == Authorized ?
"Authorized" : "Unauthorized",
sm->SUPP_BE_state,
sm->dot1xSuppEapolFramesRx,
sm->dot1xSuppEapolFramesTx,
sm->dot1xSuppEapolStartFramesTx,
sm->dot1xSuppEapolLogoffFramesTx,
sm->dot1xSuppEapolRespFramesTx,
sm->dot1xSuppEapolReqIdFramesRx,
sm->dot1xSuppEapolReqFramesRx,
sm->dot1xSuppInvalidEapolFramesRx,
sm->dot1xSuppEapLengthErrorFramesRx,
sm->dot1xSuppLastEapolFrameVersion,
MAC2STR(sm->dot1xSuppLastEapolFrameSource));
return len;
}
void eapol_sm_rx_eapol(struct eapol_sm *sm, u8 *src, u8 *buf, size_t len)
{
struct ieee802_1x_hdr *hdr;
struct ieee802_1x_eapol_key *key;
int plen, data_len;
if (sm == NULL)
return;
sm->dot1xSuppEapolFramesRx++;
if (len < sizeof(*hdr)) {
sm->dot1xSuppInvalidEapolFramesRx++;
return;
}
hdr = (struct ieee802_1x_hdr *) buf;
sm->dot1xSuppLastEapolFrameVersion = hdr->version;
memcpy(sm->dot1xSuppLastEapolFrameSource, src, ETH_ALEN);
if (hdr->version < EAPOL_VERSION) {
/* TODO: backwards compatibility */
}
plen = be_to_host16(hdr->length);
if (plen > len - sizeof(*hdr)) {
sm->dot1xSuppEapLengthErrorFramesRx++;
return;
}
data_len = plen + sizeof(*hdr);
switch (hdr->type) {
case IEEE802_1X_TYPE_EAP_PACKET:
if (sm->cached_pmk) {
/* Trying to use PMKSA caching, but Authenticator did
* not seem to have a matching entry. Need to restart
* EAPOL state machines.
*/
eapol_sm_abort_cached(sm);
}
free(sm->eapReqData);
sm->eapReqDataLen = plen;
sm->eapReqData = malloc(sm->eapReqDataLen);
if (sm->eapReqData) {
wpa_printf(MSG_DEBUG, "EAPOL: Received EAP-Packet "
"frame");
memcpy(sm->eapReqData, (u8 *) (hdr + 1),
sm->eapReqDataLen);
sm->eapolEap = TRUE;
eapol_sm_step(sm);
}
break;
case IEEE802_1X_TYPE_EAPOL_KEY:
if (plen < sizeof(*key)) {
wpa_printf(MSG_DEBUG, "EAPOL: Too short EAPOL-Key "
"frame received");
break;
}
key = (struct ieee802_1x_eapol_key *) (hdr + 1);
if (key->type == EAPOL_KEY_TYPE_WPA ||
key->type == EAPOL_KEY_TYPE_RSN) {
/* WPA Supplicant takes care of this frame. */
wpa_printf(MSG_DEBUG, "EAPOL: Ignoring WPA EAPOL-Key "
"frame in EAPOL state machines");
break;
}
if (key->type != EAPOL_KEY_TYPE_RC4) {
wpa_printf(MSG_DEBUG, "EAPOL: Ignored unknown "
"EAPOL-Key type %d", key->type);
break;
}
free(sm->last_rx_key);
sm->last_rx_key = malloc(data_len);
if (sm->last_rx_key) {
wpa_printf(MSG_DEBUG, "EAPOL: Received EAPOL-Key "
"frame");
memcpy(sm->last_rx_key, buf, data_len);
sm->last_rx_key_len = data_len;
sm->rxKey = TRUE;
eapol_sm_step(sm);
}
break;
default:
wpa_printf(MSG_DEBUG, "EAPOL: Received unknown EAPOL type %d",
hdr->type);
sm->dot1xSuppInvalidEapolFramesRx++;
break;
}
}
void eapol_sm_notify_tx_eapol_key(struct eapol_sm *sm)
{
if (sm)
sm->dot1xSuppEapolFramesTx++;
}
void eapol_sm_notify_portEnabled(struct eapol_sm *sm, Boolean enabled)
{
if (sm == NULL)
return;
wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
"portEnabled=%d", enabled);
sm->portEnabled = enabled;
eapol_sm_step(sm);
}
void eapol_sm_notify_portValid(struct eapol_sm *sm, Boolean valid)
{
if (sm == NULL)
return;
wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
"portValid=%d", valid);
sm->portValid = valid;
eapol_sm_step(sm);
}
void eapol_sm_notify_eap_success(struct eapol_sm *sm, Boolean success)
{
if (sm == NULL)
return;
wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
"EAP success=%d", success);
sm->eapSuccess = success;
sm->altAccept = success;
if (success)
eap_notify_success(sm->eap);
eapol_sm_step(sm);
}
void eapol_sm_notify_eap_fail(struct eapol_sm *sm, Boolean fail)
{
if (sm == NULL)
return;
wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
"EAP fail=%d", fail);
sm->eapFail = fail;
sm->altReject = fail;
eapol_sm_step(sm);
}
void eapol_sm_notify_config(struct eapol_sm *sm, struct wpa_ssid *config,
struct eapol_config *conf)
{
if (sm == NULL)
return;
sm->config = config;
if (conf == NULL)
return;
sm->conf.accept_802_1x_keys = conf->accept_802_1x_keys;
sm->conf.required_keys = conf->required_keys;
sm->conf.fast_reauth = conf->fast_reauth;
if (sm->eap) {
eap_set_fast_reauth(sm->eap, conf->fast_reauth);
eap_set_workaround(sm->eap, conf->workaround);
}
}
int eapol_sm_get_key(struct eapol_sm *sm, u8 *key, size_t len)
{
u8 *eap_key;
size_t eap_len;
if (sm == NULL || !eap_key_available(sm->eap))
return -1;
eap_key = eap_get_eapKeyData(sm->eap, &eap_len);
if (eap_key == NULL)
return -1;
if (len > eap_len)
return eap_len;
memcpy(key, eap_key, len);
return 0;
}
void eapol_sm_notify_logoff(struct eapol_sm *sm, Boolean logoff)
{
if (sm) {
sm->userLogoff = logoff;
eapol_sm_step(sm);
}
}
void eapol_sm_notify_cached(struct eapol_sm *sm)
{
if (sm == NULL)
return;
sm->SUPP_PAE_state = SUPP_PAE_AUTHENTICATED;
sm->suppPortStatus = Authorized;
eap_notify_success(sm->eap);
}
void eapol_sm_notify_pmkid_attempt(struct eapol_sm *sm, int attempt)
{
if (sm == NULL)
return;
if (attempt) {
wpa_printf(MSG_DEBUG, "RSN: Trying to use cached PMKSA");
sm->cached_pmk = TRUE;
} else {
wpa_printf(MSG_DEBUG, "RSN: Do not try to use cached PMKSA");
sm->cached_pmk = FALSE;
}
}
static void eapol_sm_abort_cached(struct eapol_sm *sm)
{
wpa_printf(MSG_DEBUG, "RSN: Authenticator did not accept PMKID, "
"doing full EAP authentication");
if (sm == NULL)
return;
sm->cached_pmk = FALSE;
sm->SUPP_PAE_state = SUPP_PAE_CONNECTING;
sm->suppPortStatus = Unauthorized;
sm->eapRestart= TRUE;
}
void eapol_sm_register_scard_ctx(struct eapol_sm *sm, void *ctx)
{
if (sm) {
sm->ctx->scard_ctx = ctx;
eap_register_scard_ctx(sm->eap, ctx);
}
}
void eapol_sm_notify_portControl(struct eapol_sm *sm, PortControl portControl)
{
if (sm == NULL)
return;
wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
"portControl=%s", eapol_port_control(portControl));
sm->portControl = portControl;
eapol_sm_step(sm);
}
void eapol_sm_notify_ctrl_attached(struct eapol_sm *sm)
{
if (sm == NULL)
return;
eap_sm_notify_ctrl_attached(sm->eap);
}
void eapol_sm_notify_ctrl_response(struct eapol_sm *sm)
{
if (sm == NULL)
return;
if (sm->eapReqData && !sm->eapReq) {
wpa_printf(MSG_DEBUG, "EAPOL: received control response (user "
"input) notification - retrying pending EAP "
"Request");
sm->eapolEap = TRUE;
sm->eapReq = TRUE;
eapol_sm_step(sm);
}
}
static struct wpa_ssid * eapol_sm_get_config(void *ctx)
{
struct eapol_sm *sm = ctx;
return sm ? sm->config : NULL;
}
static u8 * eapol_sm_get_eapReqData(void *ctx, size_t *len)
{
struct eapol_sm *sm = ctx;
if (sm == NULL || sm->eapReqData == NULL) {
*len = 0;
return NULL;
}
*len = sm->eapReqDataLen;
return sm->eapReqData;
}
static Boolean eapol_sm_get_bool(void *ctx, enum eapol_bool_var variable)
{
struct eapol_sm *sm = ctx;
if (sm == NULL)
return FALSE;
switch (variable) {
case EAPOL_eapSuccess:
return sm->eapSuccess;
case EAPOL_eapRestart:
return sm->eapRestart;
case EAPOL_eapFail:
return sm->eapFail;
case EAPOL_eapResp:
return sm->eapResp;
case EAPOL_eapNoResp:
return sm->eapNoResp;
case EAPOL_eapReq:
return sm->eapReq;
case EAPOL_portEnabled:
return sm->portEnabled;
case EAPOL_altAccept:
return sm->altAccept;
case EAPOL_altReject:
return sm->altReject;
}
return FALSE;
}
static void eapol_sm_set_bool(void *ctx, enum eapol_bool_var variable,
Boolean value)
{
struct eapol_sm *sm = ctx;
if (sm == NULL)
return;
switch (variable) {
case EAPOL_eapSuccess:
sm->eapSuccess = value;
break;
case EAPOL_eapRestart:
sm->eapRestart = value;
break;
case EAPOL_eapFail:
sm->eapFail = value;
break;
case EAPOL_eapResp:
sm->eapResp = value;
break;
case EAPOL_eapNoResp:
sm->eapNoResp = value;
break;
case EAPOL_eapReq:
sm->eapReq = value;
break;
case EAPOL_portEnabled:
sm->portEnabled = value;
break;
case EAPOL_altAccept:
sm->altAccept = value;
break;
case EAPOL_altReject:
sm->altReject = value;
break;
}
}
static unsigned int eapol_sm_get_int(void *ctx, enum eapol_int_var variable)
{
struct eapol_sm *sm = ctx;
if (sm == NULL)
return 0;
switch (variable) {
case EAPOL_idleWhile:
return sm->idleWhile;
}
return 0;
}
static void eapol_sm_set_int(void *ctx, enum eapol_int_var variable,
unsigned int value)
{
struct eapol_sm *sm = ctx;
if (sm == NULL)
return;
switch (variable) {
case EAPOL_idleWhile:
sm->idleWhile = value;
break;
}
}
static struct eapol_callbacks eapol_cb =
{
.get_config = eapol_sm_get_config,
.get_bool = eapol_sm_get_bool,
.set_bool = eapol_sm_set_bool,
.get_int = eapol_sm_get_int,
.set_int = eapol_sm_set_int,
.get_eapReqData = eapol_sm_get_eapReqData,
};
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