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/*
* WPA Supplicant / EAP-MD5
* 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 "common.h"
#include "eap_i.h"
#include "wpa_supplicant.h"
#include "config_ssid.h"
#include "md5.h"
static void * eap_md5_init(struct eap_sm *sm)
{
return (void *) 1;
}
static void eap_md5_deinit(struct eap_sm *sm, void *priv)
{
}
static u8 * eap_md5_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
struct wpa_ssid *config = eap_get_config(sm);
struct eap_hdr *req, *resp;
u8 *pos, *challenge;
int challenge_len;
MD5_CTX context;
size_t len;
if (config == NULL || config->password == NULL) {
wpa_printf(MSG_INFO, "EAP-MD5: Password not configured");
eap_sm_request_password(sm, config);
ret->ignore = TRUE;
return NULL;
}
req = (struct eap_hdr *) reqData;
pos = (u8 *) (req + 1);
if (reqDataLen < sizeof(*req) + 2 || *pos != EAP_TYPE_MD5 ||
(len = be_to_host16(req->length)) > reqDataLen) {
wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame");
ret->ignore = TRUE;
return NULL;
}
pos++;
challenge_len = *pos++;
if (challenge_len == 0 ||
challenge_len > len - sizeof(*req) - 2) {
wpa_printf(MSG_INFO, "EAP-MD5: Invalid challenge "
"(challenge_len=%d len=%lu",
challenge_len, (unsigned long) len);
ret->ignore = TRUE;
return NULL;
}
ret->ignore = FALSE;
challenge = pos;
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge",
challenge, challenge_len);
wpa_printf(MSG_DEBUG, "EAP-MD5: generating Challenge Response");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
ret->allowNotifications = TRUE;
*respDataLen = sizeof(struct eap_hdr) + 1 + 1 + MD5_MAC_LEN;
resp = malloc(*respDataLen);
if (resp == NULL)
return NULL;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = req->identifier;
resp->length = host_to_be16(*respDataLen);
pos = (u8 *) (resp + 1);
*pos++ = EAP_TYPE_MD5;
*pos++ = MD5_MAC_LEN; /* Value-Size */
MD5Init(&context);
MD5Update(&context, &resp->identifier, 1);
MD5Update(&context, config->password, config->password_len);
MD5Update(&context, challenge, challenge_len);
MD5Final(pos, &context);
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", pos, MD5_MAC_LEN);
return (u8 *) resp;
}
const struct eap_method eap_method_md5 =
{
.method = EAP_TYPE_MD5,
.name = "MD5",
.init = eap_md5_init,
.deinit = eap_md5_deinit,
.process = eap_md5_process,
};
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