2009-08-08 08:03:40 +02:00
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/*
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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2010-04-19 21:16:01 +02:00
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#include <ipxe/net80211.h>
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#include <ipxe/sec80211.h>
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#include <ipxe/wpa.h>
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#include <ipxe/eapol.h>
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#include <ipxe/crypto.h>
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#include <ipxe/arc4.h>
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#include <ipxe/crc32.h>
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#include <ipxe/sha1.h>
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#include <ipxe/hmac.h>
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#include <ipxe/list.h>
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#include <ipxe/ethernet.h>
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2009-08-08 08:03:40 +02:00
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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2012-03-04 15:58:22 +01:00
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#include <byteswap.h>
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2009-08-08 08:03:40 +02:00
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/** @file
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*
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* Handler for the aspects of WPA handshaking that are independent of
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* 802.1X/PSK or TKIP/CCMP; this mostly involves the 4-Way Handshake.
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*/
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/** List of WPA contexts in active use. */
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struct list_head wpa_contexts = LIST_HEAD_INIT ( wpa_contexts );
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/**
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* Return an error code and deauthenticate
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*
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* @v ctx WPA common context
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* @v rc Return status code
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* @ret rc The passed return status code
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*/
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static int wpa_fail ( struct wpa_common_ctx *ctx, int rc )
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{
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net80211_deauthenticate ( ctx->dev, rc );
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return rc;
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}
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/**
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* Find a cryptosystem handler structure from a crypto ID
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*
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* @v crypt Cryptosystem ID
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* @ret crypto Cryptosystem handler structure
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*
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2010-04-19 21:16:01 +02:00
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* If support for @a crypt is not compiled in to iPXE, or if @a crypt
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2009-08-08 08:03:40 +02:00
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* is NET80211_CRYPT_UNKNOWN, returns @c NULL.
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*/
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static struct net80211_crypto *
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wpa_find_cryptosystem ( enum net80211_crypto_alg crypt )
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{
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struct net80211_crypto *crypto;
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for_each_table_entry ( crypto, NET80211_CRYPTOS ) {
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if ( crypto->algorithm == crypt )
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return crypto;
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}
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return NULL;
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}
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/**
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* Find WPA key integrity and encryption handler from key version field
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*
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* @v ver Version bits of EAPOL-Key info field
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* @ret kie Key integrity and encryption handler
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*/
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struct wpa_kie * wpa_find_kie ( int version )
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{
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struct wpa_kie *kie;
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for_each_table_entry ( kie, WPA_KIES ) {
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if ( kie->version == version )
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return kie;
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}
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return NULL;
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}
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/**
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* Construct RSN or WPA information element
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*
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* @v dev 802.11 device
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* @ret ie_ret RSN or WPA information element
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* @ret rc Return status code
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*
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* This function allocates, fills, and returns a RSN or WPA
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* information element suitable for including in an association
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* request frame to the network identified by @c dev->associating.
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* If it is impossible to construct an information element consistent
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2010-04-19 21:16:01 +02:00
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* with iPXE's capabilities that is compatible with that network, or
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2009-08-08 08:03:40 +02:00
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* if none should be sent because that network's beacon included no
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* security information, returns an error indication and leaves
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* @a ie_ret unchanged.
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*
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* The returned IE will be of the same type (RSN or WPA) as was
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* included in the beacon for the network it is destined for.
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*/
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int wpa_make_rsn_ie ( struct net80211_device *dev, union ieee80211_ie **ie_ret )
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{
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u8 *rsn, *rsn_end;
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int is_rsn;
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u32 group_cipher;
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enum net80211_crypto_alg gcrypt;
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int ie_len;
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u8 *iep;
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struct ieee80211_ie_rsn *ie;
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struct ieee80211_frame *hdr;
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struct ieee80211_beacon *beacon;
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if ( ! dev->associating ) {
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DBG ( "WPA: Can't make RSN IE for a non-associating device\n" );
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return -EINVAL;
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}
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hdr = dev->associating->beacon->data;
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beacon = ( struct ieee80211_beacon * ) hdr->data;
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rsn = sec80211_find_rsn ( beacon->info_element,
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dev->associating->beacon->tail, &is_rsn,
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&rsn_end );
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if ( ! rsn ) {
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DBG ( "WPA: Can't make RSN IE when we didn't get one\n" );
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return -EINVAL;
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}
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rsn += 2; /* skip version */
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group_cipher = *( u32 * ) rsn;
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gcrypt = sec80211_rsn_get_net80211_crypt ( group_cipher );
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if ( ! wpa_find_cryptosystem ( gcrypt ) ||
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! wpa_find_cryptosystem ( dev->associating->crypto ) ) {
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DBG ( "WPA: No support for (GC:%d, PC:%d)\n",
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gcrypt, dev->associating->crypto );
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return -ENOTSUP;
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}
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/* Everything looks good - make our IE. */
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/* WPA IEs need 4 more bytes for the OUI+type */
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ie_len = ieee80211_rsn_size ( 1, 1, 0, is_rsn ) + ( 4 * ! is_rsn );
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iep = malloc ( ie_len );
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if ( ! iep )
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return -ENOMEM;
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*ie_ret = ( union ieee80211_ie * ) iep;
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/* Store ID and length bytes. */
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*iep++ = ( is_rsn ? IEEE80211_IE_RSN : IEEE80211_IE_VENDOR );
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*iep++ = ie_len - 2;
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/* Store OUI+type for WPA IEs. */
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if ( ! is_rsn ) {
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*( u32 * ) iep = IEEE80211_WPA_OUI_VEN;
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iep += 4;
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}
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/* If this is a WPA IE, the id and len bytes in the
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ieee80211_ie_rsn structure will not be valid, but by doing
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the cast we can fill all the other fields much more
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readily. */
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ie = ( struct ieee80211_ie_rsn * ) ( iep - 2 );
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ie->version = IEEE80211_RSN_VERSION;
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ie->group_cipher = group_cipher;
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ie->pairwise_count = 1;
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ie->pairwise_cipher[0] =
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sec80211_rsn_get_crypto_desc ( dev->associating->crypto,
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is_rsn );
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ie->akm_count = 1;
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ie->akm_list[0] =
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sec80211_rsn_get_akm_desc ( dev->associating->handshaking,
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is_rsn );
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if ( is_rsn ) {
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ie->rsn_capab = 0;
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ie->pmkid_count = 0;
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}
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return 0;
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}
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/**
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* Set up generic WPA support to handle 4-Way Handshake
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*
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* @v dev 802.11 device
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* @v ctx WPA common context
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* @v pmk Pairwise Master Key to use for session
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* @v pmk_len Length of PMK, almost always 32
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* @ret rc Return status code
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*/
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int wpa_start ( struct net80211_device *dev, struct wpa_common_ctx *ctx,
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const void *pmk, size_t pmk_len )
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{
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struct io_buffer *iob;
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struct ieee80211_frame *hdr;
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struct ieee80211_beacon *beacon;
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u8 *ap_rsn_ie = NULL, *ap_rsn_ie_end;
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if ( ! dev->rsn_ie || ! dev->associating )
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return -EINVAL;
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ctx->dev = dev;
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memcpy ( ctx->pmk, pmk, ctx->pmk_len = pmk_len );
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ctx->state = WPA_READY;
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ctx->replay = ~0ULL;
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iob = dev->associating->beacon;
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hdr = iob->data;
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beacon = ( struct ieee80211_beacon * ) hdr->data;
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ap_rsn_ie = sec80211_find_rsn ( beacon->info_element, iob->tail,
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&ctx->ap_rsn_is_rsn, &ap_rsn_ie_end );
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if ( ap_rsn_ie ) {
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ctx->ap_rsn_ie = malloc ( ap_rsn_ie_end - ap_rsn_ie );
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if ( ! ctx->ap_rsn_ie )
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return -ENOMEM;
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memcpy ( ctx->ap_rsn_ie, ap_rsn_ie, ap_rsn_ie_end - ap_rsn_ie );
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ctx->ap_rsn_ie_len = ap_rsn_ie_end - ap_rsn_ie;
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} else {
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return -ENOENT;
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}
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ctx->crypt = dev->associating->crypto;
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ctx->gcrypt = NET80211_CRYPT_UNKNOWN;
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list_add_tail ( &ctx->list, &wpa_contexts );
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return 0;
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}
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/**
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* Disable handling of received WPA handshake frames
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*
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* @v dev 802.11 device
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*/
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void wpa_stop ( struct net80211_device *dev )
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{
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struct wpa_common_ctx *ctx, *tmp;
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list_for_each_entry_safe ( ctx, tmp, &wpa_contexts, list ) {
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if ( ctx->dev == dev ) {
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free ( ctx->ap_rsn_ie );
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ctx->ap_rsn_ie = NULL;
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list_del ( &ctx->list );
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}
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}
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}
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/**
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* Derive pairwise transient key
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*
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* @v ctx WPA common context
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*/
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static void wpa_derive_ptk ( struct wpa_common_ctx *ctx )
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{
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struct {
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u8 mac1[ETH_ALEN];
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u8 mac2[ETH_ALEN];
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u8 nonce1[WPA_NONCE_LEN];
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u8 nonce2[WPA_NONCE_LEN];
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} __attribute__ (( packed )) ptk_data;
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/* The addresses and nonces are stored in numerical order (!) */
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if ( memcmp ( ctx->dev->netdev->ll_addr, ctx->dev->bssid,
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ETH_ALEN ) < 0 ) {
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memcpy ( ptk_data.mac1, ctx->dev->netdev->ll_addr, ETH_ALEN );
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memcpy ( ptk_data.mac2, ctx->dev->bssid, ETH_ALEN );
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} else {
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memcpy ( ptk_data.mac1, ctx->dev->bssid, ETH_ALEN );
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memcpy ( ptk_data.mac2, ctx->dev->netdev->ll_addr, ETH_ALEN );
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}
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if ( memcmp ( ctx->Anonce, ctx->Snonce, WPA_NONCE_LEN ) < 0 ) {
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memcpy ( ptk_data.nonce1, ctx->Anonce, WPA_NONCE_LEN );
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memcpy ( ptk_data.nonce2, ctx->Snonce, WPA_NONCE_LEN );
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} else {
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memcpy ( ptk_data.nonce1, ctx->Snonce, WPA_NONCE_LEN );
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memcpy ( ptk_data.nonce2, ctx->Anonce, WPA_NONCE_LEN );
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}
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DBGC2 ( ctx, "WPA %p A1 %s, A2 %s\n", ctx, eth_ntoa ( ptk_data.mac1 ),
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eth_ntoa ( ptk_data.mac2 ) );
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DBGC2 ( ctx, "WPA %p Nonce1, Nonce2:\n", ctx );
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DBGC2_HD ( ctx, ptk_data.nonce1, WPA_NONCE_LEN );
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DBGC2_HD ( ctx, ptk_data.nonce2, WPA_NONCE_LEN );
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prf_sha1 ( ctx->pmk, ctx->pmk_len,
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"Pairwise key expansion",
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&ptk_data, sizeof ( ptk_data ),
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&ctx->ptk, sizeof ( ctx->ptk ) );
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DBGC2 ( ctx, "WPA %p PTK:\n", ctx );
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DBGC2_HD ( ctx, &ctx->ptk, sizeof ( ctx->ptk ) );
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}
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/**
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* Install pairwise transient key
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*
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* @v ctx WPA common context
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* @v len Key length (16 for CCMP, 32 for TKIP)
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* @ret rc Return status code
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*/
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static inline int wpa_install_ptk ( struct wpa_common_ctx *ctx, int len )
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{
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DBGC ( ctx, "WPA %p: installing %d-byte pairwise transient key\n",
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ctx, len );
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DBGC2_HD ( ctx, &ctx->ptk.tk, len );
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return sec80211_install ( &ctx->dev->crypto, ctx->crypt,
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&ctx->ptk.tk, len, NULL );
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}
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/**
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* Install group transient key
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*
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* @v ctx WPA common context
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* @v len Key length (16 for CCMP, 32 for TKIP)
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* @v rsc Receive sequence counter field in EAPOL-Key packet
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* @ret rc Return status code
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*/
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static inline int wpa_install_gtk ( struct wpa_common_ctx *ctx, int len,
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const void *rsc )
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{
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DBGC ( ctx, "WPA %p: installing %d-byte group transient key\n",
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ctx, len );
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DBGC2_HD ( ctx, &ctx->gtk.tk, len );
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return sec80211_install ( &ctx->dev->gcrypto, ctx->gcrypt,
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&ctx->gtk.tk, len, rsc );
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}
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/**
|
|
|
|
* Search for group transient key, and install it if found
|
|
|
|
*
|
|
|
|
* @v ctx WPA common context
|
|
|
|
* @v ie Pointer to first IE in key data field
|
|
|
|
* @v ie_end Pointer to first byte not in key data field
|
|
|
|
* @v rsc Receive sequence counter field in EAPOL-Key packet
|
|
|
|
* @ret rc Return status code
|
|
|
|
*/
|
|
|
|
static int wpa_maybe_install_gtk ( struct wpa_common_ctx *ctx,
|
|
|
|
union ieee80211_ie *ie, void *ie_end,
|
|
|
|
const void *rsc )
|
|
|
|
{
|
|
|
|
struct wpa_kde *kde;
|
|
|
|
|
|
|
|
if ( ! ieee80211_ie_bound ( ie, ie_end ) )
|
|
|
|
return -ENOENT;
|
|
|
|
|
|
|
|
while ( ie ) {
|
|
|
|
if ( ie->id == IEEE80211_IE_VENDOR &&
|
|
|
|
ie->vendor.oui == WPA_KDE_GTK )
|
|
|
|
break;
|
|
|
|
|
|
|
|
ie = ieee80211_next_ie ( ie, ie_end );
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( ! ie )
|
|
|
|
return -ENOENT;
|
|
|
|
|
|
|
|
if ( ie->len - 6u > sizeof ( ctx->gtk.tk ) ) {
|
2010-03-30 15:33:20 +02:00
|
|
|
DBGC ( ctx, "WPA %p: GTK KDE is too long (%d bytes, max %zd)\n",
|
2009-08-08 08:03:40 +02:00
|
|
|
ctx, ie->len - 4, sizeof ( ctx->gtk.tk ) );
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* XXX We ignore key ID for now. */
|
|
|
|
kde = ( struct wpa_kde * ) ie;
|
|
|
|
memcpy ( &ctx->gtk.tk, &kde->gtk_encap.gtk, kde->len - 6 );
|
|
|
|
|
|
|
|
return wpa_install_gtk ( ctx, kde->len - 6, rsc );
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Allocate I/O buffer for construction of outgoing EAPOL-Key frame
|
|
|
|
*
|
|
|
|
* @v kdlen Maximum number of bytes in the Key Data field
|
|
|
|
* @ret iob Newly allocated I/O buffer
|
|
|
|
*
|
|
|
|
* The returned buffer will have space reserved for the link-layer and
|
|
|
|
* EAPOL headers, and will have @c iob->tail pointing to the start of
|
|
|
|
* the Key Data field. Thus, it is necessary to use iob_put() in
|
|
|
|
* filling the Key Data.
|
|
|
|
*/
|
|
|
|
static struct io_buffer * wpa_alloc_frame ( int kdlen )
|
|
|
|
{
|
|
|
|
struct io_buffer *ret = alloc_iob ( sizeof ( struct eapol_key_pkt ) +
|
|
|
|
kdlen + EAPOL_HDR_LEN +
|
|
|
|
MAX_LL_HEADER_LEN );
|
|
|
|
if ( ! ret )
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
iob_reserve ( ret, MAX_LL_HEADER_LEN + EAPOL_HDR_LEN );
|
|
|
|
memset ( iob_put ( ret, sizeof ( struct eapol_key_pkt ) ), 0,
|
|
|
|
sizeof ( struct eapol_key_pkt ) );
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Send EAPOL-Key packet
|
|
|
|
*
|
|
|
|
* @v iob I/O buffer, with sufficient headroom for headers
|
|
|
|
* @v dev 802.11 device
|
|
|
|
* @v kie Key integrity and encryption handler
|
|
|
|
* @v is_rsn If TRUE, handshake uses new RSN format
|
|
|
|
* @ret rc Return status code
|
|
|
|
*
|
|
|
|
* If a KIE is specified, the MIC will be filled in before transmission.
|
|
|
|
*/
|
|
|
|
static int wpa_send_eapol ( struct io_buffer *iob, struct wpa_common_ctx *ctx,
|
|
|
|
struct wpa_kie *kie )
|
|
|
|
{
|
|
|
|
struct eapol_key_pkt *pkt = iob->data;
|
|
|
|
struct eapol_frame *eapol = iob_push ( iob, EAPOL_HDR_LEN );
|
|
|
|
|
|
|
|
pkt->info = htons ( pkt->info );
|
|
|
|
pkt->keysize = htons ( pkt->keysize );
|
|
|
|
pkt->datalen = htons ( pkt->datalen );
|
|
|
|
pkt->replay = cpu_to_be64 ( pkt->replay );
|
|
|
|
eapol->version = EAPOL_THIS_VERSION;
|
|
|
|
eapol->type = EAPOL_TYPE_KEY;
|
|
|
|
eapol->length = htons ( iob->tail - iob->data - sizeof ( *eapol ) );
|
|
|
|
|
|
|
|
memset ( pkt->mic, 0, sizeof ( pkt->mic ) );
|
|
|
|
if ( kie )
|
|
|
|
kie->mic ( &ctx->ptk.kck, eapol, EAPOL_HDR_LEN +
|
|
|
|
sizeof ( *pkt ) + ntohs ( pkt->datalen ),
|
|
|
|
pkt->mic );
|
|
|
|
|
|
|
|
return net_tx ( iob, ctx->dev->netdev, &eapol_protocol,
|
2010-10-07 17:03:16 +02:00
|
|
|
ctx->dev->bssid, ctx->dev->netdev->ll_addr );
|
2009-08-08 08:03:40 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Send second frame in 4-Way Handshake
|
|
|
|
*
|
|
|
|
* @v ctx WPA common context
|
|
|
|
* @v pkt First frame, to which this is a reply
|
|
|
|
* @v is_rsn If TRUE, handshake uses new RSN format
|
|
|
|
* @v kie Key integrity and encryption handler
|
|
|
|
* @ret rc Return status code
|
|
|
|
*/
|
|
|
|
static int wpa_send_2_of_4 ( struct wpa_common_ctx *ctx,
|
|
|
|
struct eapol_key_pkt *pkt, int is_rsn,
|
|
|
|
struct wpa_kie *kie )
|
|
|
|
{
|
|
|
|
struct io_buffer *iob = wpa_alloc_frame ( ctx->dev->rsn_ie->len + 2 );
|
|
|
|
struct eapol_key_pkt *npkt;
|
|
|
|
|
|
|
|
if ( ! iob )
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
npkt = iob->data;
|
|
|
|
memcpy ( npkt, pkt, sizeof ( *pkt ) );
|
|
|
|
npkt->info &= ~EAPOL_KEY_INFO_KEY_ACK;
|
|
|
|
npkt->info |= EAPOL_KEY_INFO_KEY_MIC;
|
|
|
|
if ( is_rsn )
|
|
|
|
npkt->keysize = 0;
|
|
|
|
memcpy ( npkt->nonce, ctx->Snonce, sizeof ( npkt->nonce ) );
|
|
|
|
npkt->datalen = ctx->dev->rsn_ie->len + 2;
|
|
|
|
memcpy ( iob_put ( iob, npkt->datalen ), ctx->dev->rsn_ie,
|
|
|
|
npkt->datalen );
|
|
|
|
|
|
|
|
DBGC ( ctx, "WPA %p: sending 2/4\n", ctx );
|
|
|
|
|
|
|
|
return wpa_send_eapol ( iob, ctx, kie );
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Handle receipt of first frame in 4-Way Handshake
|
|
|
|
*
|
|
|
|
* @v ctx WPA common context
|
|
|
|
* @v pkt EAPOL-Key packet
|
|
|
|
* @v is_rsn If TRUE, frame uses new RSN format
|
|
|
|
* @v kie Key integrity and encryption handler
|
|
|
|
* @ret rc Return status code
|
|
|
|
*/
|
|
|
|
static int wpa_handle_1_of_4 ( struct wpa_common_ctx *ctx,
|
|
|
|
struct eapol_key_pkt *pkt, int is_rsn,
|
|
|
|
struct wpa_kie *kie )
|
|
|
|
{
|
|
|
|
if ( ctx->state == WPA_WAITING )
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ctx->state = WPA_WORKING;
|
|
|
|
memcpy ( ctx->Anonce, pkt->nonce, sizeof ( ctx->Anonce ) );
|
|
|
|
if ( ! ctx->have_Snonce ) {
|
|
|
|
get_random_bytes ( ctx->Snonce, sizeof ( ctx->Snonce ) );
|
|
|
|
ctx->have_Snonce = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
DBGC ( ctx, "WPA %p: received 1/4, looks OK\n", ctx );
|
|
|
|
|
|
|
|
wpa_derive_ptk ( ctx );
|
|
|
|
|
|
|
|
return wpa_send_2_of_4 ( ctx, pkt, is_rsn, kie );
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Send fourth frame in 4-Way Handshake, or second in Group Key Handshake
|
|
|
|
*
|
|
|
|
* @v ctx WPA common context
|
|
|
|
* @v pkt EAPOL-Key packet for frame to which we're replying
|
|
|
|
* @v is_rsn If TRUE, frame uses new RSN format
|
|
|
|
* @v kie Key integrity and encryption handler
|
|
|
|
* @ret rc Return status code
|
|
|
|
*/
|
|
|
|
static int wpa_send_final ( struct wpa_common_ctx *ctx,
|
|
|
|
struct eapol_key_pkt *pkt, int is_rsn,
|
|
|
|
struct wpa_kie *kie )
|
|
|
|
{
|
|
|
|
struct io_buffer *iob = wpa_alloc_frame ( 0 );
|
|
|
|
struct eapol_key_pkt *npkt;
|
|
|
|
|
|
|
|
if ( ! iob )
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
npkt = iob->data;
|
|
|
|
memcpy ( npkt, pkt, sizeof ( *pkt ) );
|
|
|
|
npkt->info &= ~( EAPOL_KEY_INFO_KEY_ACK | EAPOL_KEY_INFO_INSTALL |
|
|
|
|
EAPOL_KEY_INFO_KEY_ENC );
|
|
|
|
if ( is_rsn )
|
|
|
|
npkt->keysize = 0;
|
|
|
|
memset ( npkt->nonce, 0, sizeof ( npkt->nonce ) );
|
|
|
|
memset ( npkt->iv, 0, sizeof ( npkt->iv ) );
|
|
|
|
npkt->datalen = 0;
|
|
|
|
|
|
|
|
if ( npkt->info & EAPOL_KEY_INFO_TYPE )
|
|
|
|
DBGC ( ctx, "WPA %p: sending 4/4\n", ctx );
|
|
|
|
else
|
|
|
|
DBGC ( ctx, "WPA %p: sending 2/2\n", ctx );
|
|
|
|
|
|
|
|
return wpa_send_eapol ( iob, ctx, kie );
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Handle receipt of third frame in 4-Way Handshake
|
|
|
|
*
|
|
|
|
* @v ctx WPA common context
|
|
|
|
* @v pkt EAPOL-Key packet
|
|
|
|
* @v is_rsn If TRUE, frame uses new RSN format
|
|
|
|
* @v kie Key integrity and encryption handler
|
|
|
|
* @ret rc Return status code
|
|
|
|
*/
|
|
|
|
static int wpa_handle_3_of_4 ( struct wpa_common_ctx *ctx,
|
|
|
|
struct eapol_key_pkt *pkt, int is_rsn,
|
|
|
|
struct wpa_kie *kie )
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
u8 *this_rsn, *this_rsn_end;
|
|
|
|
u8 *new_rsn, *new_rsn_end;
|
|
|
|
int this_is_rsn, new_is_rsn;
|
|
|
|
|
|
|
|
if ( ctx->state == WPA_WAITING )
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ctx->state = WPA_WORKING;
|
|
|
|
|
|
|
|
/* Check nonce */
|
|
|
|
if ( memcmp ( ctx->Anonce, pkt->nonce, WPA_NONCE_LEN ) != 0 ) {
|
|
|
|
DBGC ( ctx, "WPA %p ALERT: nonce mismatch in 3/4\n", ctx );
|
|
|
|
return wpa_fail ( ctx, -EACCES );
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check RSN IE */
|
|
|
|
this_rsn = sec80211_find_rsn ( ( union ieee80211_ie * ) pkt->data,
|
|
|
|
pkt->data + pkt->datalen,
|
|
|
|
&this_is_rsn, &this_rsn_end );
|
|
|
|
if ( this_rsn )
|
|
|
|
new_rsn = sec80211_find_rsn ( ( union ieee80211_ie * )
|
|
|
|
this_rsn_end,
|
|
|
|
pkt->data + pkt->datalen,
|
|
|
|
&new_is_rsn, &new_rsn_end );
|
|
|
|
else
|
|
|
|
new_rsn = NULL;
|
|
|
|
|
|
|
|
if ( ! ctx->ap_rsn_ie || ! this_rsn ||
|
|
|
|
ctx->ap_rsn_ie_len != ( this_rsn_end - this_rsn ) ||
|
|
|
|
ctx->ap_rsn_is_rsn != this_is_rsn ||
|
|
|
|
memcmp ( ctx->ap_rsn_ie, this_rsn, ctx->ap_rsn_ie_len ) != 0 ) {
|
|
|
|
DBGC ( ctx, "WPA %p ALERT: RSN mismatch in 3/4\n", ctx );
|
|
|
|
DBGC2 ( ctx, "WPA %p RSNs (in 3/4, in beacon):\n", ctx );
|
|
|
|
DBGC2_HD ( ctx, this_rsn, this_rsn_end - this_rsn );
|
|
|
|
DBGC2_HD ( ctx, ctx->ap_rsn_ie, ctx->ap_rsn_ie_len );
|
|
|
|
return wpa_fail ( ctx, -EACCES );
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Don't switch if they just supplied both styles of IE
|
|
|
|
simultaneously; we need two RSN IEs or two WPA IEs to
|
|
|
|
switch ciphers. They'll be immediately consecutive because
|
|
|
|
of ordering guarantees. */
|
|
|
|
if ( new_rsn && this_is_rsn == new_is_rsn ) {
|
|
|
|
struct net80211_wlan *assoc = ctx->dev->associating;
|
|
|
|
DBGC ( ctx, "WPA %p: accommodating bait-and-switch tactics\n",
|
|
|
|
ctx );
|
|
|
|
DBGC2 ( ctx, "WPA %p RSNs (in 3/4+beacon, new in 3/4):\n",
|
|
|
|
ctx );
|
|
|
|
DBGC2_HD ( ctx, this_rsn, this_rsn_end - this_rsn );
|
|
|
|
DBGC2_HD ( ctx, new_rsn, new_rsn_end - new_rsn );
|
|
|
|
|
|
|
|
if ( ( rc = sec80211_detect_ie ( new_is_rsn, new_rsn,
|
|
|
|
new_rsn_end,
|
|
|
|
&assoc->handshaking,
|
|
|
|
&assoc->crypto ) ) != 0 )
|
|
|
|
DBGC ( ctx, "WPA %p: bait-and-switch invalid, staying "
|
|
|
|
"with original request\n", ctx );
|
|
|
|
} else {
|
|
|
|
new_rsn = this_rsn;
|
|
|
|
new_is_rsn = this_is_rsn;
|
|
|
|
new_rsn_end = this_rsn_end;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Grab group cryptosystem ID */
|
|
|
|
ctx->gcrypt = sec80211_rsn_get_net80211_crypt ( *( u32 * )
|
|
|
|
( new_rsn + 2 ) );
|
|
|
|
|
|
|
|
/* Check for a GTK, if info field is encrypted */
|
|
|
|
if ( pkt->info & EAPOL_KEY_INFO_KEY_ENC ) {
|
|
|
|
rc = wpa_maybe_install_gtk ( ctx,
|
|
|
|
( union ieee80211_ie * ) pkt->data,
|
|
|
|
pkt->data + pkt->datalen,
|
|
|
|
pkt->rsc );
|
|
|
|
if ( rc < 0 ) {
|
|
|
|
DBGC ( ctx, "WPA %p did not install GTK in 3/4: %s\n",
|
|
|
|
ctx, strerror ( rc ) );
|
|
|
|
if ( rc != -ENOENT )
|
|
|
|
return wpa_fail ( ctx, rc );
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
DBGC ( ctx, "WPA %p: received 3/4, looks OK\n", ctx );
|
|
|
|
|
|
|
|
/* Send final message */
|
|
|
|
rc = wpa_send_final ( ctx, pkt, is_rsn, kie );
|
|
|
|
if ( rc < 0 )
|
|
|
|
return wpa_fail ( ctx, rc );
|
|
|
|
|
|
|
|
/* Install PTK */
|
|
|
|
rc = wpa_install_ptk ( ctx, pkt->keysize );
|
|
|
|
if ( rc < 0 ) {
|
|
|
|
DBGC ( ctx, "WPA %p failed to install PTK: %s\n", ctx,
|
|
|
|
strerror ( rc ) );
|
|
|
|
return wpa_fail ( ctx, rc );
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Mark us as needing a new Snonce if we rekey */
|
|
|
|
ctx->have_Snonce = 0;
|
|
|
|
|
|
|
|
/* Done! */
|
|
|
|
ctx->state = WPA_SUCCESS;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Handle receipt of first frame in Group Key Handshake
|
|
|
|
*
|
|
|
|
* @v ctx WPA common context
|
|
|
|
* @v pkt EAPOL-Key packet
|
|
|
|
* @v is_rsn If TRUE, frame uses new RSN format
|
|
|
|
* @v kie Key integrity and encryption handler
|
|
|
|
* @ret rc Return status code
|
|
|
|
*/
|
|
|
|
static int wpa_handle_1_of_2 ( struct wpa_common_ctx *ctx,
|
|
|
|
struct eapol_key_pkt *pkt, int is_rsn,
|
|
|
|
struct wpa_kie *kie )
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* WPA and RSN do this completely differently.
|
|
|
|
*
|
|
|
|
* The idea of encoding the GTK (or PMKID, or various other
|
|
|
|
* things) into a KDE that looks like an information element
|
|
|
|
* is an RSN innovation; old WPA code never encapsulates
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|
|
|
* things like that. If it looks like an info element, it
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|
|
|
* really is (for the WPA IE check in frames 2/4 and 3/4). The
|
|
|
|
* "key data encrypted" bit in the info field is also specific
|
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|
|
* to RSN.
|
|
|
|
*
|
|
|
|
* So from an old WPA host, 3/4 does not contain an
|
|
|
|
* encapsulated GTK. The first frame of the GK handshake
|
|
|
|
* contains it, encrypted, but without a KDE wrapper, and with
|
2010-04-19 21:16:01 +02:00
|
|
|
* the key ID field (which iPXE doesn't use) shoved away in
|
2009-08-08 08:03:40 +02:00
|
|
|
* the reserved bits in the info field, and the TxRx bit
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|
|
* stealing the Install bit's spot.
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|
*/
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if ( is_rsn && ( pkt->info & EAPOL_KEY_INFO_KEY_ENC ) ) {
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|
|
rc = wpa_maybe_install_gtk ( ctx,
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|
|
( union ieee80211_ie * ) pkt->data,
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|
|
pkt->data + pkt->datalen,
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|
|
|
pkt->rsc );
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|
|
if ( rc < 0 ) {
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|
DBGC ( ctx, "WPA %p: failed to install GTK in 1/2: "
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|
"%s\n", ctx, strerror ( rc ) );
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|
|
return wpa_fail ( ctx, rc );
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|
|
}
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|
|
} else {
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rc = kie->decrypt ( &ctx->ptk.kek, pkt->iv, pkt->data,
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|
|
|
&pkt->datalen );
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|
|
if ( rc < 0 ) {
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|
DBGC ( ctx, "WPA %p: failed to decrypt GTK: %s\n",
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ctx, strerror ( rc ) );
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|
return rc; /* non-fatal */
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|
}
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if ( pkt->datalen > sizeof ( ctx->gtk.tk ) ) {
|
2010-03-30 15:33:20 +02:00
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|
|
DBGC ( ctx, "WPA %p: too much GTK data (%d > %zd)\n",
|
2009-08-08 08:03:40 +02:00
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|
|
ctx, pkt->datalen, sizeof ( ctx->gtk.tk ) );
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|
|
return wpa_fail ( ctx, -EINVAL );
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|
|
}
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memcpy ( &ctx->gtk.tk, pkt->data, pkt->datalen );
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wpa_install_gtk ( ctx, pkt->datalen, pkt->rsc );
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|
}
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|
DBGC ( ctx, "WPA %p: received 1/2, looks OK\n", ctx );
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|
return wpa_send_final ( ctx, pkt, is_rsn, kie );
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|
|
}
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|
/**
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* Handle receipt of EAPOL-Key frame for WPA
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*
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|
|
* @v iob I/O buffer
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|
|
* @v netdev Network device
|
2010-10-07 17:03:16 +02:00
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|
|
* @v ll_dest Link-layer destination address
|
2009-08-08 08:03:40 +02:00
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|
|
* @v ll_source Source link-layer address
|
|
|
|
*/
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|
|
static int eapol_key_rx ( struct io_buffer *iob, struct net_device *netdev,
|
2010-10-07 17:03:16 +02:00
|
|
|
const void *ll_dest __unused,
|
2009-08-08 08:03:40 +02:00
|
|
|
const void *ll_source )
|
|
|
|
{
|
|
|
|
struct net80211_device *dev = net80211_get ( netdev );
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|
|
|
struct eapol_key_pkt *pkt = iob->data;
|
|
|
|
int is_rsn, found_ctx;
|
|
|
|
struct wpa_common_ctx *ctx;
|
|
|
|
int rc = 0;
|
|
|
|
struct wpa_kie *kie;
|
|
|
|
u8 their_mic[16], our_mic[16];
|
|
|
|
|
|
|
|
if ( pkt->type != EAPOL_KEY_TYPE_WPA &&
|
|
|
|
pkt->type != EAPOL_KEY_TYPE_RSN ) {
|
|
|
|
DBG ( "EAPOL-Key: packet not of 802.11 type\n" );
|
|
|
|
rc = -EINVAL;
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
|
|
|
|
is_rsn = ( pkt->type == EAPOL_KEY_TYPE_RSN );
|
|
|
|
|
|
|
|
if ( ! dev ) {
|
|
|
|
DBG ( "EAPOL-Key: packet not from 802.11\n" );
|
|
|
|
rc = -EINVAL;
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( memcmp ( dev->bssid, ll_source, ETH_ALEN ) != 0 ) {
|
|
|
|
DBG ( "EAPOL-Key: packet not from associated AP\n" );
|
|
|
|
rc = -EINVAL;
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( ! ( ntohs ( pkt->info ) & EAPOL_KEY_INFO_KEY_ACK ) ) {
|
|
|
|
DBG ( "EAPOL-Key: packet sent in wrong direction\n" );
|
|
|
|
rc = -EINVAL;
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
|
|
|
|
found_ctx = 0;
|
|
|
|
list_for_each_entry ( ctx, &wpa_contexts, list ) {
|
|
|
|
if ( ctx->dev == dev ) {
|
|
|
|
found_ctx = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( ! found_ctx ) {
|
|
|
|
DBG ( "EAPOL-Key: no WPA context to handle packet for %p\n",
|
|
|
|
dev );
|
|
|
|
rc = -ENOENT;
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( ( void * ) ( pkt + 1 ) + ntohs ( pkt->datalen ) > iob->tail ) {
|
2010-03-30 15:33:20 +02:00
|
|
|
DBGC ( ctx, "WPA %p: packet truncated (has %zd extra bytes, "
|
2009-08-08 08:03:40 +02:00
|
|
|
"states %d)\n", ctx, iob->tail - ( void * ) ( pkt + 1 ),
|
|
|
|
ntohs ( pkt->datalen ) );
|
|
|
|
rc = -EINVAL;
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Get a handle on key integrity/encryption handler */
|
|
|
|
kie = wpa_find_kie ( ntohs ( pkt->info ) & EAPOL_KEY_INFO_VERSION );
|
|
|
|
if ( ! kie ) {
|
|
|
|
DBGC ( ctx, "WPA %p: no support for packet version %d\n", ctx,
|
|
|
|
ntohs ( pkt->info ) & EAPOL_KEY_INFO_VERSION );
|
|
|
|
rc = wpa_fail ( ctx, -ENOTSUP );
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check MIC */
|
|
|
|
if ( ntohs ( pkt->info ) & EAPOL_KEY_INFO_KEY_MIC ) {
|
|
|
|
memcpy ( their_mic, pkt->mic, sizeof ( pkt->mic ) );
|
|
|
|
memset ( pkt->mic, 0, sizeof ( pkt->mic ) );
|
|
|
|
kie->mic ( &ctx->ptk.kck, ( void * ) pkt - EAPOL_HDR_LEN,
|
|
|
|
EAPOL_HDR_LEN + sizeof ( *pkt ) +
|
|
|
|
ntohs ( pkt->datalen ), our_mic );
|
|
|
|
DBGC2 ( ctx, "WPA %p MIC comparison (theirs, ours):\n", ctx );
|
|
|
|
DBGC2_HD ( ctx, their_mic, 16 );
|
|
|
|
DBGC2_HD ( ctx, our_mic, 16 );
|
|
|
|
if ( memcmp ( their_mic, our_mic, sizeof ( pkt->mic ) ) != 0 ) {
|
|
|
|
DBGC ( ctx, "WPA %p: EAPOL MIC failure\n", ctx );
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Fix byte order to local */
|
|
|
|
pkt->info = ntohs ( pkt->info );
|
|
|
|
pkt->keysize = ntohs ( pkt->keysize );
|
|
|
|
pkt->datalen = ntohs ( pkt->datalen );
|
|
|
|
pkt->replay = be64_to_cpu ( pkt->replay );
|
|
|
|
|
|
|
|
/* Check replay counter */
|
|
|
|
if ( ctx->replay != ~0ULL && ctx->replay >= pkt->replay ) {
|
|
|
|
DBGC ( ctx, "WPA %p ALERT: Replay detected! "
|
|
|
|
"(%08x:%08x >= %08x:%08x)\n", ctx,
|
|
|
|
( u32 ) ( ctx->replay >> 32 ), ( u32 ) ctx->replay,
|
|
|
|
( u32 ) ( pkt->replay >> 32 ), ( u32 ) pkt->replay );
|
|
|
|
rc = 0; /* ignore without error */
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
ctx->replay = pkt->replay;
|
|
|
|
|
|
|
|
/* Decrypt key data */
|
|
|
|
if ( pkt->info & EAPOL_KEY_INFO_KEY_ENC ) {
|
|
|
|
rc = kie->decrypt ( &ctx->ptk.kek, pkt->iv, pkt->data,
|
|
|
|
&pkt->datalen );
|
|
|
|
if ( rc < 0 ) {
|
|
|
|
DBGC ( ctx, "WPA %p: failed to decrypt packet: %s\n",
|
|
|
|
ctx, strerror ( rc ) );
|
|
|
|
goto drop;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Hand it off to appropriate handler */
|
|
|
|
switch ( pkt->info & ( EAPOL_KEY_INFO_TYPE |
|
|
|
|
EAPOL_KEY_INFO_KEY_MIC ) ) {
|
|
|
|
case EAPOL_KEY_TYPE_PTK:
|
|
|
|
rc = wpa_handle_1_of_4 ( ctx, pkt, is_rsn, kie );
|
|
|
|
break;
|
|
|
|
|
|
|
|
case EAPOL_KEY_TYPE_PTK | EAPOL_KEY_INFO_KEY_MIC:
|
|
|
|
rc = wpa_handle_3_of_4 ( ctx, pkt, is_rsn, kie );
|
|
|
|
break;
|
|
|
|
|
|
|
|
case EAPOL_KEY_TYPE_GTK | EAPOL_KEY_INFO_KEY_MIC:
|
|
|
|
rc = wpa_handle_1_of_2 ( ctx, pkt, is_rsn, kie );
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
DBGC ( ctx, "WPA %p: Invalid combination of key flags %04x\n",
|
|
|
|
ctx, pkt->info );
|
|
|
|
rc = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
drop:
|
|
|
|
free_iob ( iob );
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct eapol_handler eapol_key_handler __eapol_handler = {
|
|
|
|
.type = EAPOL_TYPE_KEY,
|
|
|
|
.rx = eapol_key_rx,
|
|
|
|
};
|
|
|
|
|
|
|
|
/* WPA always needs EAPOL in order to be useful */
|
|
|
|
REQUIRE_OBJECT ( eapol );
|