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-rw-r--r--gpxe/src/net/80211/wpa_psk.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/gpxe/src/net/80211/wpa_psk.c b/gpxe/src/net/80211/wpa_psk.c
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+++ b/gpxe/src/net/80211/wpa_psk.c
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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 ),
+};