128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/*
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* Copyright (c) 2009 Joshua Oreman <oremanj@rwcr.net>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <string.h>
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#include <ipxe/net80211.h>
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#include <ipxe/sha1.h>
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#include <ipxe/wpa.h>
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#include <errno.h>
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/** @file
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*
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* Frontend for WPA using a pre-shared key.
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*/
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/**
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* Initialise WPA-PSK state
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*
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* @v dev 802.11 device
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* @ret rc Return status code
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*/
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static int wpa_psk_init ( struct net80211_device *dev )
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{
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return wpa_make_rsn_ie ( dev, &dev->rsn_ie );
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}
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/**
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* Start WPA-PSK authentication
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*
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* @v dev 802.11 device
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* @ret rc Return status code
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*/
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static int wpa_psk_start ( struct net80211_device *dev )
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{
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char passphrase[64+1];
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u8 pmk[WPA_PMK_LEN];
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int len;
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struct wpa_common_ctx *ctx = dev->handshaker->priv;
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len = fetch_string_setting ( netdev_settings ( dev->netdev ),
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&net80211_key_setting, passphrase,
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64 + 1 );
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if ( len <= 0 ) {
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DBGC ( ctx, "WPA-PSK %p: no passphrase provided!\n", ctx );
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net80211_deauthenticate ( dev, -EACCES );
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return -EACCES;
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}
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pbkdf2_sha1 ( passphrase, len, dev->essid, strlen ( dev->essid ),
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4096, pmk, WPA_PMK_LEN );
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DBGC ( ctx, "WPA-PSK %p: derived PMK from passphrase `%s':\n", ctx,
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passphrase );
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DBGC_HD ( ctx, pmk, WPA_PMK_LEN );
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return wpa_start ( dev, ctx, pmk, WPA_PMK_LEN );
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}
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/**
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* Step WPA-PSK authentication
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*
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* @v dev 802.11 device
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* @ret rc Return status code
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*/
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static int wpa_psk_step ( struct net80211_device *dev )
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{
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struct wpa_common_ctx *ctx = dev->handshaker->priv;
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switch ( ctx->state ) {
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case WPA_SUCCESS:
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return 1;
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case WPA_FAILURE:
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return -EACCES;
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default:
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return 0;
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}
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}
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/**
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* Do-nothing function; you can't change a WPA key post-authentication
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*
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* @v dev 802.11 device
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* @ret rc Return status code
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*/
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static int wpa_psk_no_change_key ( struct net80211_device *dev __unused )
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{
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return 0;
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}
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/**
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* Disable handling of received WPA authentication frames
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*
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* @v dev 802.11 device
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*/
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static void wpa_psk_stop ( struct net80211_device *dev )
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{
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wpa_stop ( dev );
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}
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/** WPA-PSK security handshaker */
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struct net80211_handshaker wpa_psk_handshaker __net80211_handshaker = {
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.protocol = NET80211_SECPROT_PSK,
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.init = wpa_psk_init,
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.start = wpa_psk_start,
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.step = wpa_psk_step,
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.change_key = wpa_psk_no_change_key,
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.stop = wpa_psk_stop,
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.priv_len = sizeof ( struct wpa_common_ctx ),
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};
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