freebsd-dev/contrib/wpa_supplicant/eap_leap.c
2006-03-07 05:26:33 +00:00

390 lines
10 KiB
C

/*
* WPA Supplicant / EAP-LEAP
* 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 "eap_i.h"
#include "wpa_supplicant.h"
#include "config_ssid.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 = malloc(sizeof(*data));
if (data == NULL)
return NULL;
memset(data, 0, sizeof(*data));
data->state = LEAP_WAIT_CHALLENGE;
sm->leap_done = FALSE;
return data;
}
static void eap_leap_deinit(struct eap_sm *sm, void *priv)
{
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;
struct wpa_ssid *config = eap_get_config(sm);
const struct eap_hdr *req;
struct eap_hdr *resp;
const u8 *pos, *challenge;
u8 challenge_len, *rpos;
wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Request");
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;
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");
*respDataLen = sizeof(struct eap_hdr) + 1 + 3 + LEAP_RESPONSE_LEN +
config->identity_len;
resp = malloc(*respDataLen);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = req->identifier;
resp->length = host_to_be16(*respDataLen);
rpos = (u8 *) (resp + 1);
*rpos++ = EAP_TYPE_LEAP;
*rpos++ = LEAP_VERSION;
*rpos++ = 0; /* unused */
*rpos++ = LEAP_RESPONSE_LEN;
nt_challenge_response(challenge,
config->password, config->password_len, rpos);
memcpy(data->peer_response, rpos, LEAP_RESPONSE_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-LEAP: Response",
rpos, LEAP_RESPONSE_LEN);
rpos += LEAP_RESPONSE_LEN;
memcpy(rpos, config->identity, config->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 reqDataLen,
size_t *respDataLen)
{
struct eap_leap_data *data = priv;
struct wpa_ssid *config = eap_get_config(sm);
const struct eap_hdr *req;
struct eap_hdr *resp;
u8 *pos;
wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Success");
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;
*respDataLen = sizeof(struct eap_hdr) + 1 + 3 + LEAP_CHALLENGE_LEN +
config->identity_len;
resp = malloc(*respDataLen);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_REQUEST;
resp->identifier = req->identifier;
resp->length = host_to_be16(*respDataLen);
pos = (u8 *) (resp + 1);
*pos++ = EAP_TYPE_LEAP;
*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");
free(resp);
ret->ignore = TRUE;
return NULL;
}
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;
memcpy(pos, config->identity, config->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,
size_t *respDataLen)
{
struct eap_leap_data *data = priv;
struct wpa_ssid *config = eap_get_config(sm);
const struct eap_hdr *resp;
const u8 *pos;
u8 response_len, pw_hash[16], pw_hash_hash[16],
expected[LEAP_RESPONSE_LEN];
wpa_printf(MSG_DEBUG, "EAP-LEAP: Processing EAP-Response");
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);
memcpy(data->ap_response, pos, LEAP_RESPONSE_LEN);
nt_password_hash(config->password, config->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 (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)
{
struct wpa_ssid *config = eap_get_config(sm);
const struct eap_hdr *eap;
size_t len;
if (config == NULL || config->password == NULL) {
wpa_printf(MSG_INFO, "EAP-LEAP: Password not configured");
eap_sm_request_password(sm, config);
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, len,
respDataLen);
case EAP_CODE_RESPONSE:
return eap_leap_process_response(sm, priv, ret, reqData, len,
respDataLen);
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;
struct wpa_ssid *config = eap_get_config(sm);
u8 *key, pw_hash_hash[16], pw_hash[16];
const u8 *addr[5];
size_t elen[5];
if (data->state != LEAP_DONE)
return NULL;
key = malloc(LEAP_KEY_LEN);
if (key == NULL)
return NULL;
nt_password_hash(config->password, config->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;
}
const struct eap_method eap_method_leap =
{
.method = EAP_TYPE_LEAP,
.name = "LEAP",
.init = eap_leap_init,
.deinit = eap_leap_deinit,
.process = eap_leap_process,
.isKeyAvailable = eap_leap_isKeyAvailable,
.getKey = eap_leap_getKey,
};