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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., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- #include <string.h>
- #include <ipxe/net80211.h>
- #include <ipxe/sha1.h>
- #include <ipxe/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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