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/*
* EAP peer method: LEAP
* Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/

#include "includes.h"

#include "common.h"
#include "eap_i.h"
#include "ms_funcs.h"
#include "crypto.h"

#define LEAP_VERSION 1
#define LEAP_CHALLENGE_LEN 8
#define LEAP_RESPONSE_LEN 24
#define LEAP_KEY_LEN 16


struct eap_leap_data {
enum {
LEAP_WAIT_CHALLENGE,
LEAP_WAIT_SUCCESS,
LEAP_WAIT_RESPONSE,
LEAP_DONE
} state;

u8 peer_challenge[LEAP_CHALLENGE_LEN];
u8 peer_response[LEAP_RESPONSE_LEN];

u8 ap_challenge[LEAP_CHALLENGE_LEN];
u8 ap_response[LEAP_RESPONSE_LEN];
};


static void * eap_leap_init(struct eap_sm *sm)
{
struct eap_leap_data *data;

data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
data->state = LEAP_WAIT_CHALLENGE;

sm->leap_done = FALSE;
return data;
}


static void eap_leap_deinit(struct eap_sm *sm, void *priv)
{
os_free(priv);
}


static u8 * eap_leap_process_request(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
struct eap_leap_data *data = priv;
const struct eap_hdr *req;
struct eap_hdr *resp;
const u8 *pos, *challenge, *identity, *password;
u8 challenge_len, *rpos;
size_t identity_len, password_len;

wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Request");

identity = eap_get_config_identity(sm, &identity_len);
password = eap_get_config_password(sm, &password_len);
if (identity == NULL || password == NULL)
return NULL;

req = (const struct eap_hdr *) reqData;
pos = (const u8 *) (req + 1);
if (reqDataLen < sizeof(*req) + 4 || *pos != EAP_TYPE_LEAP) {
wpa_printf(MSG_INFO, "EAP-LEAP: Invalid EAP-Request frame");
ret->ignore = TRUE;
return NULL;
}
pos++;

if (*pos != LEAP_VERSION) {
wpa_printf(MSG_WARNING, "EAP-LEAP: Unsupported LEAP version "
"%d", *pos);
ret->ignore = TRUE;
return NULL;
}
pos++;

pos++; /* skip unused byte */

challenge_len = *pos++;
if (challenge_len != LEAP_CHALLENGE_LEN ||
challenge_len > reqDataLen - sizeof(*req) - 4) {
wpa_printf(MSG_INFO, "EAP-LEAP: Invalid challenge "
"(challenge_len=%d reqDataLen=%lu)",
challenge_len, (unsigned long) reqDataLen);
ret->ignore = TRUE;
return NULL;
}
challenge = pos;
os_memcpy(data->peer_challenge, challenge, LEAP_CHALLENGE_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Challenge from AP",
challenge, LEAP_CHALLENGE_LEN);

wpa_printf(MSG_DEBUG, "EAP-LEAP: Generating Challenge Response");

resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_LEAP, respDataLen,
3 + LEAP_RESPONSE_LEN + identity_len,
EAP_CODE_RESPONSE, req->identifier, &rpos);
if (resp == NULL)
return NULL;
*rpos++ = LEAP_VERSION;
*rpos++ = 0; /* unused */
*rpos++ = LEAP_RESPONSE_LEN;
nt_challenge_response(challenge, password, password_len, rpos);
os_memcpy(data->peer_response, rpos, LEAP_RESPONSE_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Response",
rpos, LEAP_RESPONSE_LEN);
rpos += LEAP_RESPONSE_LEN;
os_memcpy(rpos, identity, identity_len);

data->state = LEAP_WAIT_SUCCESS;

return (u8 *) resp;
}


static u8 * eap_leap_process_success(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t *respDataLen)
{
struct eap_leap_data *data = priv;
const struct eap_hdr *req;
struct eap_hdr *resp;
u8 *pos;
const u8 *identity;
size_t identity_len;

wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Success");

identity = eap_get_config_identity(sm, &identity_len);
if (identity == NULL)
return NULL;

if (data->state != LEAP_WAIT_SUCCESS) {
wpa_printf(MSG_INFO, "EAP-LEAP: EAP-Success received in "
"unexpected state (%d) - ignored", data->state);
ret->ignore = TRUE;
return NULL;
}

req = (const struct eap_hdr *) reqData;

resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_LEAP, respDataLen,
3 + LEAP_CHALLENGE_LEN + identity_len,
EAP_CODE_REQUEST, req->identifier, &pos);
if (resp == NULL)
return NULL;
*pos++ = LEAP_VERSION;
*pos++ = 0; /* unused */
*pos++ = LEAP_CHALLENGE_LEN;
if (hostapd_get_rand(pos, LEAP_CHALLENGE_LEN)) {
wpa_printf(MSG_WARNING, "EAP-LEAP: Failed to read random data "
"for challenge");
os_free(resp);
ret->ignore = TRUE;
return NULL;
}
os_memcpy(data->ap_challenge, pos, LEAP_CHALLENGE_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Challenge to AP/AS", pos,
LEAP_CHALLENGE_LEN);
pos += LEAP_CHALLENGE_LEN;
os_memcpy(pos, identity, identity_len);

data->state = LEAP_WAIT_RESPONSE;

return (u8 *) resp;
}


static u8 * eap_leap_process_response(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen)
{
struct eap_leap_data *data = priv;
const struct eap_hdr *resp;
const u8 *pos, *password;
u8 response_len, pw_hash[16], pw_hash_hash[16],
expected[LEAP_RESPONSE_LEN];
size_t password_len;

wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Response");

password = eap_get_config_password(sm, &password_len);
if (password == NULL)
return NULL;

resp = (const struct eap_hdr *) reqData;
pos = (const u8 *) (resp + 1);
if (reqDataLen < sizeof(*resp) + 4 || *pos != EAP_TYPE_LEAP) {
wpa_printf(MSG_INFO, "EAP-LEAP: Invalid EAP-Response frame");
ret->ignore = TRUE;
return NULL;
}
pos++;

if (*pos != LEAP_VERSION) {
wpa_printf(MSG_WARNING, "EAP-LEAP: Unsupported LEAP version "
"%d", *pos);
ret->ignore = TRUE;
return NULL;
}
pos++;

pos++; /* skip unused byte */

response_len = *pos++;
if (response_len != LEAP_RESPONSE_LEN ||
response_len > reqDataLen - sizeof(*resp) - 4) {
wpa_printf(MSG_INFO, "EAP-LEAP: Invalid response "
"(response_len=%d reqDataLen=%lu)",
response_len, (unsigned long) reqDataLen);
ret->ignore = TRUE;
return NULL;
}

wpa_hexdump(MSG_DEBUG, "EAP-LEAP: Response from AP",
pos, LEAP_RESPONSE_LEN);
os_memcpy(data->ap_response, pos, LEAP_RESPONSE_LEN);

nt_password_hash(password, password_len, pw_hash);
hash_nt_password_hash(pw_hash, pw_hash_hash);
challenge_response(data->ap_challenge, pw_hash_hash, expected);

ret->methodState = METHOD_DONE;
ret->allowNotifications = FALSE;

if (os_memcmp(pos, expected, LEAP_RESPONSE_LEN) != 0) {
wpa_printf(MSG_WARNING, "EAP-LEAP: AP sent an invalid "
"response - authentication failed");
wpa_hexdump(MSG_DEBUG, "EAP-LEAP: Expected response from AP",
expected, LEAP_RESPONSE_LEN);
ret->decision = DECISION_FAIL;
return NULL;
}

ret->decision = DECISION_UNCOND_SUCC;

/* LEAP is somewhat odd method since it sends EAP-Success in the middle
* of the authentication. Use special variable to transit EAP state
* machine to SUCCESS state. */
sm->leap_done = TRUE;
data->state = LEAP_DONE;

/* No more authentication messages expected; AP will send EAPOL-Key
* frames if encryption is enabled. */
return NULL;
}


static u8 * eap_leap_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
const struct eap_hdr *eap;
size_t len, password_len;
const u8 *password;

password = eap_get_config_password(sm, &password_len);
if (password == NULL) {
wpa_printf(MSG_INFO, "EAP-LEAP: Password not configured");
eap_sm_request_password(sm);
ret->ignore = TRUE;
return NULL;
}

eap = (const struct eap_hdr *) reqData;

if (reqDataLen < sizeof(*eap) ||
(len = be_to_host16(eap->length)) > reqDataLen) {
wpa_printf(MSG_INFO, "EAP-LEAP: Invalid frame");
ret->ignore = TRUE;
return NULL;
}

ret->ignore = FALSE;
ret->allowNotifications = TRUE;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_FAIL;

sm->leap_done = FALSE;

switch (eap->code) {
case EAP_CODE_REQUEST:
return eap_leap_process_request(sm, priv, ret, reqData, len,
respDataLen);
case EAP_CODE_SUCCESS:
return eap_leap_process_success(sm, priv, ret, reqData,
respDataLen);
case EAP_CODE_RESPONSE:
return eap_leap_process_response(sm, priv, ret, reqData, len);
default:
wpa_printf(MSG_INFO, "EAP-LEAP: Unexpected EAP code (%d) - "
"ignored", eap->code);
ret->ignore = TRUE;
return NULL;
}
}


static Boolean eap_leap_isKeyAvailable(struct eap_sm *sm, void *priv)
{
struct eap_leap_data *data = priv;
return data->state == LEAP_DONE;
}


static u8 * eap_leap_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_leap_data *data = priv;
u8 *key, pw_hash_hash[16], pw_hash[16];
const u8 *addr[5], *password;
size_t elen[5], password_len;

if (data->state != LEAP_DONE)
return NULL;

password = eap_get_config_password(sm, &password_len);
if (password == NULL)
return NULL;

key = os_malloc(LEAP_KEY_LEN);
if (key == NULL)
return NULL;

nt_password_hash(password, password_len, pw_hash);
hash_nt_password_hash(pw_hash, pw_hash_hash);
wpa_hexdump_key(MSG_DEBUG, "EAP-LEAP: pw_hash_hash",
pw_hash_hash, 16);
wpa_hexdump(MSG_DEBUG, "EAP-LEAP: peer_challenge",
data->peer_challenge, LEAP_CHALLENGE_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-LEAP: peer_response",
data->peer_response, LEAP_RESPONSE_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-LEAP: ap_challenge",
data->ap_challenge, LEAP_CHALLENGE_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-LEAP: ap_response",
data->ap_response, LEAP_RESPONSE_LEN);

addr[0] = pw_hash_hash;
elen[0] = 16;
addr[1] = data->ap_challenge;
elen[1] = LEAP_CHALLENGE_LEN;
addr[2] = data->ap_response;
elen[2] = LEAP_RESPONSE_LEN;
addr[3] = data->peer_challenge;
elen[3] = LEAP_CHALLENGE_LEN;
addr[4] = data->peer_response;
elen[4] = LEAP_RESPONSE_LEN;
md5_vector(5, addr, elen, key);
wpa_hexdump_key(MSG_DEBUG, "EAP-LEAP: master key", key, LEAP_KEY_LEN);
*len = LEAP_KEY_LEN;

return key;
}


int eap_peer_leap_register(void)
{
struct eap_method *eap;
int ret;

eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_LEAP, "LEAP");
if (eap == NULL)
return -1;

eap->init = eap_leap_init;
eap->deinit = eap_leap_deinit;
eap->process = eap_leap_process;
eap->isKeyAvailable = eap_leap_isKeyAvailable;
eap->getKey = eap_leap_getKey;

ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}
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