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/*
* Copyright (c) 2009 Joshua Oreman <oremanj@rwcr.net>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <gpxe/net80211.h>
#include <gpxe/sha1.h>
#include <gpxe/wpa.h>
#include <errno.h>
/** @file
*
* Frontend for WPA using a pre-shared key.
*/
/**
* Initialise WPA-PSK state
*
* @v dev 802.11 device
* @ret rc Return status code
*/
static int wpa_psk_init ( struct net80211_device *dev )
{
return wpa_make_rsn_ie ( dev, &dev->rsn_ie );
}
/**
* Start WPA-PSK authentication
*
* @v dev 802.11 device
* @ret rc Return status code
*/
static int wpa_psk_start ( struct net80211_device *dev )
{
char passphrase[64+1];
u8 pmk[WPA_PMK_LEN];
int len;
struct wpa_common_ctx *ctx = dev->handshaker->priv;
len = fetch_string_setting ( netdev_settings ( dev->netdev ),
&net80211_key_setting, passphrase,
64 + 1 );
if ( len <= 0 ) {
DBGC ( ctx, "WPA-PSK %p: no passphrase provided!\n", ctx );
net80211_deauthenticate ( dev, -EACCES );
return -EACCES;
}
pbkdf2_sha1 ( passphrase, len, dev->essid, strlen ( dev->essid ),
4096, pmk, WPA_PMK_LEN );
DBGC ( ctx, "WPA-PSK %p: derived PMK from passphrase `%s':\n", ctx,
passphrase );
DBGC_HD ( ctx, pmk, WPA_PMK_LEN );
return wpa_start ( dev, ctx, pmk, WPA_PMK_LEN );
}
/**
* Step WPA-PSK authentication
*
* @v dev 802.11 device
* @ret rc Return status code
*/
static int wpa_psk_step ( struct net80211_device *dev )
{
struct wpa_common_ctx *ctx = dev->handshaker->priv;
switch ( ctx->state ) {
case WPA_SUCCESS:
return 1;
case WPA_FAILURE:
return -EACCES;
default:
return 0;
}
}
/**
* Do-nothing function; you can't change a WPA key post-authentication
*
* @v dev 802.11 device
* @ret rc Return status code
*/
static int wpa_psk_no_change_key ( struct net80211_device *dev __unused )
{
return 0;
}
/**
* Disable handling of received WPA authentication frames
*
* @v dev 802.11 device
*/
static void wpa_psk_stop ( struct net80211_device *dev )
{
wpa_stop ( dev );
}
/** WPA-PSK security handshaker */
struct net80211_handshaker wpa_psk_handshaker __net80211_handshaker = {
.protocol = NET80211_SECPROT_PSK,
.init = wpa_psk_init,
.start = wpa_psk_start,
.step = wpa_psk_step,
.change_key = wpa_psk_no_change_key,
.stop = wpa_psk_stop,
.priv_len = sizeof ( struct wpa_common_ctx ),
};
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