NetBSD/dist/hostapd/eap_md5.c

185 lines
4.0 KiB
C

/*
* hostapd / EAP-MD5 server
* 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 <netinet/in.h>
#include "hostapd.h"
#include "common.h"
#include "eap_i.h"
#include "md5.h"
#include "crypto.h"
#define CHALLENGE_LEN 16
struct eap_md5_data {
u8 challenge[CHALLENGE_LEN];
enum { CONTINUE, SUCCESS, FAILURE } state;
};
static void * eap_md5_init(struct eap_sm *sm)
{
struct eap_md5_data *data;
data = malloc(sizeof(*data));
if (data == NULL)
return data;
memset(data, 0, sizeof(*data));
data->state = CONTINUE;
return data;
}
static void eap_md5_reset(struct eap_sm *sm, void *priv)
{
struct eap_md5_data *data = priv;
free(data);
}
static u8 * eap_md5_buildReq(struct eap_sm *sm, void *priv, int id,
size_t *reqDataLen)
{
struct eap_md5_data *data = priv;
struct eap_hdr *req;
u8 *pos;
if (hostapd_get_rand(data->challenge, CHALLENGE_LEN)) {
wpa_printf(MSG_ERROR, "EAP-MD5: Failed to get random data");
data->state = FAILURE;
return NULL;
}
*reqDataLen = sizeof(*req) + 2 + CHALLENGE_LEN;
req = malloc(*reqDataLen);
if (req == NULL) {
wpa_printf(MSG_ERROR, "EAP-MD5: Failed to allocate memory for "
"request");
data->state = FAILURE;
return NULL;
}
req->code = EAP_CODE_REQUEST;
req->identifier = id;
req->length = htons(*reqDataLen);
pos = (u8 *) (req + 1);
*pos++ = EAP_TYPE_MD5;
*pos++ = CHALLENGE_LEN;
memcpy(pos, data->challenge, CHALLENGE_LEN);
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge", pos, CHALLENGE_LEN);
data->state = CONTINUE;
return (u8 *) req;
}
static Boolean eap_md5_check(struct eap_sm *sm, void *priv,
u8 *respData, size_t respDataLen)
{
struct eap_hdr *resp;
u8 *pos;
size_t len;
resp = (struct eap_hdr *) respData;
pos = (u8 *) (resp + 1);
if (respDataLen < sizeof(*resp) + 2 || *pos != EAP_TYPE_MD5 ||
(len = ntohs(resp->length)) > respDataLen) {
wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame");
return TRUE;
}
pos++;
if (*pos != MD5_MAC_LEN ||
sizeof(*resp) + 2 + MD5_MAC_LEN > len) {
wpa_printf(MSG_INFO, "EAP-MD5: Invalid response "
"(response_len=%d respDataLen=%lu",
*pos, (unsigned long) respDataLen);
return TRUE;
}
return FALSE;
}
static void eap_md5_process(struct eap_sm *sm, void *priv,
u8 *respData, size_t respDataLen)
{
struct eap_md5_data *data = priv;
struct eap_hdr *resp;
u8 *pos;
const u8 *addr[3];
size_t len[3];
u8 hash[MD5_MAC_LEN];
if (sm->user == NULL || sm->user->password == NULL) {
wpa_printf(MSG_INFO, "EAP-MD5: Password not configured");
data->state = FAILURE;
return;
}
resp = (struct eap_hdr *) respData;
pos = (u8 *) (resp + 1);
pos += 2; /* Skip type and len */
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", pos, MD5_MAC_LEN);
addr[0] = &resp->identifier;
len[0] = 1;
addr[1] = sm->user->password;
len[1] = sm->user->password_len;
addr[2] = data->challenge;
len[2] = CHALLENGE_LEN;
md5_vector(3, addr, len, hash);
if (memcmp(hash, pos, MD5_MAC_LEN) == 0) {
wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Success");
data->state = SUCCESS;
} else {
wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Failure");
data->state = FAILURE;
}
}
static Boolean eap_md5_isDone(struct eap_sm *sm, void *priv)
{
struct eap_md5_data *data = priv;
return data->state != CONTINUE;
}
static Boolean eap_md5_isSuccess(struct eap_sm *sm, void *priv)
{
struct eap_md5_data *data = priv;
return data->state == SUCCESS;
}
const struct eap_method eap_method_md5 =
{
.method = EAP_TYPE_MD5,
.name = "MD5",
.init = eap_md5_init,
.reset = eap_md5_reset,
.buildReq = eap_md5_buildReq,
.check = eap_md5_check,
.process = eap_md5_process,
.isDone = eap_md5_isDone,
.isSuccess = eap_md5_isSuccess,
};