1500 lines
39 KiB
C
1500 lines
39 KiB
C
/*
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* hostapd - IEEE 802.11r - Fast BSS Transition
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* Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "config.h"
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#include "wpa.h"
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#include "aes_wrap.h"
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#include "ieee802_11.h"
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#include "defs.h"
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#include "wpa_auth_i.h"
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#include "wpa_auth_ie.h"
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#ifdef CONFIG_IEEE80211R
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static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
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const u8 *data, size_t data_len)
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{
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if (wpa_auth->cb.send_ether == NULL)
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return -1;
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return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
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data, data_len);
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}
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static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
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const u8 *dst, const u8 *data, size_t data_len)
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{
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if (wpa_auth->cb.send_ft_action == NULL)
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return -1;
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return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
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data, data_len);
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}
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static struct wpa_state_machine *
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wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
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{
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if (wpa_auth->cb.add_sta == NULL)
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return NULL;
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return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
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}
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int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
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{
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u8 *pos = buf;
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u8 capab;
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if (len < 2 + sizeof(struct rsn_mdie))
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return -1;
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*pos++ = WLAN_EID_MOBILITY_DOMAIN;
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*pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
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os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
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pos += MOBILITY_DOMAIN_ID_LEN;
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capab = RSN_FT_CAPAB_FT_OVER_DS;
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*pos++ = capab;
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return pos - buf;
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}
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static int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
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size_t r0kh_id_len,
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const u8 *anonce, const u8 *snonce,
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u8 *buf, size_t len, const u8 *subelem,
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size_t subelem_len)
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{
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u8 *pos = buf, *ielen;
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struct rsn_ftie *hdr;
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if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
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subelem_len)
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return -1;
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*pos++ = WLAN_EID_FAST_BSS_TRANSITION;
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ielen = pos++;
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hdr = (struct rsn_ftie *) pos;
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os_memset(hdr, 0, sizeof(*hdr));
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pos += sizeof(*hdr);
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WPA_PUT_LE16(hdr->mic_control, 0);
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if (anonce)
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os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
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if (snonce)
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os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
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/* Optional Parameters */
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*pos++ = FTIE_SUBELEM_R1KH_ID;
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*pos++ = FT_R1KH_ID_LEN;
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os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
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pos += FT_R1KH_ID_LEN;
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if (r0kh_id) {
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*pos++ = FTIE_SUBELEM_R0KH_ID;
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*pos++ = r0kh_id_len;
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os_memcpy(pos, r0kh_id, r0kh_id_len);
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pos += r0kh_id_len;
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}
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if (subelem) {
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os_memcpy(pos, subelem, subelem_len);
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pos += subelem_len;
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}
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*ielen = pos - buf - 2;
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return pos - buf;
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}
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struct wpa_ft_pmk_r0_sa {
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struct wpa_ft_pmk_r0_sa *next;
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u8 pmk_r0[PMK_LEN];
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u8 pmk_r0_name[WPA_PMK_NAME_LEN];
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u8 spa[ETH_ALEN];
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/* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
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int pmk_r1_pushed;
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};
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struct wpa_ft_pmk_r1_sa {
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struct wpa_ft_pmk_r1_sa *next;
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u8 pmk_r1[PMK_LEN];
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u8 pmk_r1_name[WPA_PMK_NAME_LEN];
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u8 spa[ETH_ALEN];
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/* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
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};
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struct wpa_ft_pmk_cache {
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struct wpa_ft_pmk_r0_sa *pmk_r0;
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struct wpa_ft_pmk_r1_sa *pmk_r1;
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};
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struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
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{
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struct wpa_ft_pmk_cache *cache;
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cache = os_zalloc(sizeof(*cache));
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return cache;
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}
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void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
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{
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struct wpa_ft_pmk_r0_sa *r0, *r0prev;
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struct wpa_ft_pmk_r1_sa *r1, *r1prev;
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r0 = cache->pmk_r0;
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while (r0) {
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r0prev = r0;
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r0 = r0->next;
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os_memset(r0prev->pmk_r0, 0, PMK_LEN);
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os_free(r0prev);
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}
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r1 = cache->pmk_r1;
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while (r1) {
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r1prev = r1;
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r1 = r1->next;
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os_memset(r1prev->pmk_r1, 0, PMK_LEN);
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os_free(r1prev);
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}
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os_free(cache);
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}
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static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
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const u8 *spa, const u8 *pmk_r0,
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const u8 *pmk_r0_name)
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{
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struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
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struct wpa_ft_pmk_r0_sa *r0;
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/* TODO: add expiration and limit on number of entries in cache */
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r0 = os_zalloc(sizeof(*r0));
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if (r0 == NULL)
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return -1;
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os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
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os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
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os_memcpy(r0->spa, spa, ETH_ALEN);
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r0->next = cache->pmk_r0;
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cache->pmk_r0 = r0;
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return 0;
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}
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static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
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const u8 *spa, const u8 *pmk_r0_name,
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u8 *pmk_r0)
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{
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struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
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struct wpa_ft_pmk_r0_sa *r0;
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r0 = cache->pmk_r0;
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while (r0) {
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if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
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os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
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== 0) {
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os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
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return 0;
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}
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r0 = r0->next;
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}
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return -1;
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}
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static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
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const u8 *spa, const u8 *pmk_r1,
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const u8 *pmk_r1_name)
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{
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struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
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struct wpa_ft_pmk_r1_sa *r1;
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/* TODO: add expiration and limit on number of entries in cache */
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r1 = os_zalloc(sizeof(*r1));
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if (r1 == NULL)
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return -1;
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os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
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os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
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os_memcpy(r1->spa, spa, ETH_ALEN);
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r1->next = cache->pmk_r1;
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cache->pmk_r1 = r1;
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return 0;
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}
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static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
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const u8 *spa, const u8 *pmk_r1_name,
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u8 *pmk_r1)
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{
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struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
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struct wpa_ft_pmk_r1_sa *r1;
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r1 = cache->pmk_r1;
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while (r1) {
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if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
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os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
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== 0) {
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os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
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return 0;
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}
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r1 = r1->next;
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}
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return -1;
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}
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static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth,
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const u8 *s1kh_id, const u8 *r0kh_id,
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size_t r0kh_id_len, const u8 *pmk_r0_name)
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{
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struct ft_remote_r0kh *r0kh;
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struct ft_r0kh_r1kh_pull_frame frame, f;
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r0kh = wpa_auth->conf.r0kh_list;
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while (r0kh) {
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if (r0kh->id_len == r0kh_id_len &&
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os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0)
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break;
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r0kh = r0kh->next;
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}
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if (r0kh == NULL)
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return -1;
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wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
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"address " MACSTR, MAC2STR(r0kh->addr));
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os_memset(&frame, 0, sizeof(frame));
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frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
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frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
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frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
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os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
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/* aes_wrap() does not support inplace encryption, so use a temporary
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* buffer for the data. */
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if (os_get_random(f.nonce, sizeof(f.nonce))) {
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wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
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"nonce");
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return -1;
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}
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os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
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os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
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os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
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if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
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f.nonce, frame.nonce) < 0)
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return -1;
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wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
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return 0;
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}
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int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
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struct wpa_ptk *ptk)
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{
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u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
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u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
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u8 ptk_name[WPA_PMK_NAME_LEN];
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const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
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const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
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size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
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const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
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const u8 *ssid = sm->wpa_auth->conf.ssid;
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size_t ssid_len = sm->wpa_auth->conf.ssid_len;
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if (sm->xxkey_len == 0) {
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wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
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"derivation");
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return -1;
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}
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wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
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r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
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wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
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wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
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wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name);
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wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
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pmk_r1, pmk_r1_name);
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wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
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wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
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wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_name);
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wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
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sm->wpa_auth->addr, pmk_r1_name,
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(u8 *) ptk, sizeof(*ptk), ptk_name);
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wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, sizeof(*ptk));
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wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
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return 0;
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}
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static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
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const u8 *addr, int idx, u8 *seq)
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{
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if (wpa_auth->cb.get_seqnum == NULL)
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return -1;
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return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
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}
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#ifdef CONFIG_IEEE80211W
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static inline int wpa_auth_get_seqnum_igtk(struct wpa_authenticator *wpa_auth,
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const u8 *addr, int idx, u8 *seq)
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{
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if (wpa_auth->cb.get_seqnum_igtk == NULL)
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return -1;
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return wpa_auth->cb.get_seqnum_igtk(wpa_auth->cb.ctx, addr, idx, seq);
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}
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#endif /* CONFIG_IEEE80211W */
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static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
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{
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u8 *subelem;
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struct wpa_group *gsm = sm->group;
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size_t subelem_len, pad_len;
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const u8 *key;
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size_t key_len;
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u8 keybuf[32];
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key_len = gsm->GTK_len;
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if (key_len > sizeof(keybuf))
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return NULL;
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/*
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* Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
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* than 16 bytes.
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*/
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pad_len = key_len % 8;
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if (pad_len)
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pad_len = 8 - pad_len;
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if (key_len + pad_len < 16)
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pad_len += 8;
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if (pad_len) {
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os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
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os_memset(keybuf + key_len, 0, pad_len);
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keybuf[key_len] = 0xdd;
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key_len += pad_len;
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key = keybuf;
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} else
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key = gsm->GTK[gsm->GN - 1];
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/*
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* Sub-elem ID[1] | Length[1] | Key Info[1] | Key Length[1] | RSC[8] |
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* Key[5..32].
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*/
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subelem_len = 12 + key_len + 8;
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subelem = os_zalloc(subelem_len);
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if (subelem == NULL)
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return NULL;
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subelem[0] = FTIE_SUBELEM_GTK;
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subelem[1] = 10 + key_len + 8;
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subelem[2] = gsm->GN & 0x03; /* Key ID in B0-B1 of Key Info */
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subelem[3] = gsm->GTK_len;
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wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 4);
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if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 12)) {
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os_free(subelem);
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return NULL;
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}
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*len = subelem_len;
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return subelem;
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}
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#ifdef CONFIG_IEEE80211W
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static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
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{
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u8 *subelem, *pos;
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struct wpa_group *gsm = sm->group;
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size_t subelem_len;
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/* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
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* Key[16+8] */
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subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
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subelem = os_zalloc(subelem_len);
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if (subelem == NULL)
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return NULL;
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|
|
pos = subelem;
|
|
*pos++ = FTIE_SUBELEM_IGTK;
|
|
*pos++ = subelem_len - 2;
|
|
WPA_PUT_LE16(pos, gsm->GN_igtk);
|
|
pos += 2;
|
|
wpa_auth_get_seqnum_igtk(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
|
|
pos += 6;
|
|
*pos++ = WPA_IGTK_LEN;
|
|
if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
|
|
gsm->IGTK[gsm->GN_igtk - 4], pos)) {
|
|
os_free(subelem);
|
|
return NULL;
|
|
}
|
|
|
|
*len = subelem_len;
|
|
return subelem;
|
|
}
|
|
#endif /* CONFIG_IEEE80211W */
|
|
|
|
|
|
u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
|
|
size_t max_len, int auth_alg)
|
|
{
|
|
u8 *end, *mdie, *ftie, *rsnie, *r0kh_id, *subelem = NULL;
|
|
size_t mdie_len, ftie_len, rsnie_len, r0kh_id_len, subelem_len = 0;
|
|
int res;
|
|
struct wpa_auth_config *conf;
|
|
struct rsn_ftie *_ftie;
|
|
|
|
if (sm == NULL)
|
|
return pos;
|
|
|
|
conf = &sm->wpa_auth->conf;
|
|
|
|
if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
|
|
sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK)
|
|
return pos;
|
|
|
|
end = pos + max_len;
|
|
|
|
/* RSN */
|
|
res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
|
|
if (res < 0)
|
|
return pos;
|
|
rsnie = pos;
|
|
rsnie_len = res;
|
|
pos += res;
|
|
|
|
/* Mobility Domain Information */
|
|
res = wpa_write_mdie(conf, pos, end - pos);
|
|
if (res < 0)
|
|
return pos;
|
|
mdie = pos;
|
|
mdie_len = res;
|
|
pos += res;
|
|
|
|
/* Fast BSS Transition Information */
|
|
if (auth_alg == WLAN_AUTH_FT) {
|
|
subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
|
|
r0kh_id = sm->r0kh_id;
|
|
r0kh_id_len = sm->r0kh_id_len;
|
|
#ifdef CONFIG_IEEE80211W
|
|
if (sm->mgmt_frame_prot) {
|
|
u8 *igtk;
|
|
size_t igtk_len;
|
|
u8 *nbuf;
|
|
igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
|
|
if (igtk == NULL) {
|
|
os_free(subelem);
|
|
return pos;
|
|
}
|
|
nbuf = os_realloc(subelem, subelem_len + igtk_len);
|
|
if (nbuf == NULL) {
|
|
os_free(subelem);
|
|
os_free(igtk);
|
|
return pos;
|
|
}
|
|
subelem = nbuf;
|
|
os_memcpy(subelem + subelem_len, igtk, igtk_len);
|
|
subelem_len += igtk_len;
|
|
os_free(igtk);
|
|
}
|
|
#endif /* CONFIG_IEEE80211W */
|
|
} else {
|
|
r0kh_id = conf->r0_key_holder;
|
|
r0kh_id_len = conf->r0_key_holder_len;
|
|
}
|
|
res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, NULL, NULL, pos,
|
|
end - pos, subelem, subelem_len);
|
|
os_free(subelem);
|
|
if (res < 0)
|
|
return pos;
|
|
ftie = pos;
|
|
ftie_len = res;
|
|
pos += res;
|
|
|
|
_ftie = (struct rsn_ftie *) (ftie + 2);
|
|
_ftie->mic_control[1] = 3; /* Information element count */
|
|
if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
|
|
mdie, mdie_len, ftie, ftie_len,
|
|
rsnie, rsnie_len, NULL, 0, _ftie->mic) < 0)
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
|
|
|
|
return pos;
|
|
}
|
|
|
|
|
|
struct wpa_ft_ies {
|
|
const u8 *mdie;
|
|
size_t mdie_len;
|
|
const u8 *ftie;
|
|
size_t ftie_len;
|
|
const u8 *r1kh_id;
|
|
const u8 *gtk;
|
|
size_t gtk_len;
|
|
const u8 *r0kh_id;
|
|
size_t r0kh_id_len;
|
|
const u8 *rsn;
|
|
size_t rsn_len;
|
|
const u8 *rsn_pmkid;
|
|
};
|
|
|
|
|
|
static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
|
|
struct wpa_ft_ies *parse)
|
|
{
|
|
const u8 *end, *pos;
|
|
|
|
parse->ftie = ie;
|
|
parse->ftie_len = ie_len;
|
|
|
|
pos = ie + sizeof(struct rsn_ftie);
|
|
end = ie + ie_len;
|
|
|
|
while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
|
|
switch (pos[0]) {
|
|
case FTIE_SUBELEM_R1KH_ID:
|
|
if (pos[1] != FT_R1KH_ID_LEN) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
|
|
"length in FTIE: %d", pos[1]);
|
|
return -1;
|
|
}
|
|
parse->r1kh_id = pos + 2;
|
|
break;
|
|
case FTIE_SUBELEM_GTK:
|
|
parse->gtk = pos + 2;
|
|
parse->gtk_len = pos[1];
|
|
break;
|
|
case FTIE_SUBELEM_R0KH_ID:
|
|
if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
|
|
"length in FTIE: %d", pos[1]);
|
|
return -1;
|
|
}
|
|
parse->r0kh_id = pos + 2;
|
|
parse->r0kh_id_len = pos[1];
|
|
break;
|
|
}
|
|
|
|
pos += 2 + pos[1];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
|
|
struct wpa_ft_ies *parse)
|
|
{
|
|
const u8 *end, *pos;
|
|
struct wpa_ie_data data;
|
|
int ret;
|
|
|
|
os_memset(parse, 0, sizeof(*parse));
|
|
if (ies == NULL)
|
|
return 0;
|
|
|
|
pos = ies;
|
|
end = ies + ies_len;
|
|
while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
|
|
switch (pos[0]) {
|
|
case WLAN_EID_RSN:
|
|
parse->rsn = pos + 2;
|
|
parse->rsn_len = pos[1];
|
|
ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
|
|
parse->rsn_len + 2,
|
|
&data);
|
|
if (ret < 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to parse "
|
|
"RSN IE: %d", ret);
|
|
return -1;
|
|
}
|
|
if (data.num_pmkid == 1 && data.pmkid)
|
|
parse->rsn_pmkid = data.pmkid;
|
|
break;
|
|
case WLAN_EID_MOBILITY_DOMAIN:
|
|
parse->mdie = pos + 2;
|
|
parse->mdie_len = pos[1];
|
|
break;
|
|
case WLAN_EID_FAST_BSS_TRANSITION:
|
|
if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
|
|
return -1;
|
|
break;
|
|
}
|
|
|
|
pos += 2 + pos[1];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
|
|
int vlan_id,
|
|
const char *alg, const u8 *addr, int idx,
|
|
u8 *key, size_t key_len)
|
|
{
|
|
if (wpa_auth->cb.set_key == NULL)
|
|
return -1;
|
|
return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
|
|
key, key_len);
|
|
}
|
|
|
|
|
|
static void wpa_ft_install_ptk(struct wpa_state_machine *sm)
|
|
{
|
|
char *alg;
|
|
int klen;
|
|
|
|
/* MLME-SETKEYS.request(PTK) */
|
|
if (sm->pairwise == WPA_CIPHER_TKIP) {
|
|
alg = "TKIP";
|
|
klen = 32;
|
|
} else if (sm->pairwise == WPA_CIPHER_CCMP) {
|
|
alg = "CCMP";
|
|
klen = 16;
|
|
} else
|
|
return;
|
|
|
|
/* FIX: add STA entry to kernel/driver here? The set_key will fail
|
|
* most likely without this.. At the moment, STA entry is added only
|
|
* after association has been completed. Alternatively, could
|
|
* re-configure PTK at that point(?).
|
|
*/
|
|
if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
|
|
sm->PTK.tk1, klen))
|
|
return;
|
|
|
|
/* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
|
|
sm->pairwise_set = TRUE;
|
|
}
|
|
|
|
|
|
static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
|
|
const u8 *ies, size_t ies_len,
|
|
u8 **resp_ies, size_t *resp_ies_len)
|
|
{
|
|
struct rsn_mdie *mdie;
|
|
struct rsn_ftie *ftie;
|
|
u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
|
|
u8 ptk_name[WPA_PMK_NAME_LEN];
|
|
struct wpa_auth_config *conf;
|
|
struct wpa_ft_ies parse;
|
|
size_t buflen;
|
|
int ret;
|
|
u8 *pos, *end;
|
|
|
|
*resp_ies = NULL;
|
|
*resp_ies_len = 0;
|
|
|
|
sm->pmk_r1_name_valid = 0;
|
|
conf = &sm->wpa_auth->conf;
|
|
|
|
wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
|
|
ies, ies_len);
|
|
|
|
if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
|
|
mdie = (struct rsn_mdie *) parse.mdie;
|
|
if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
|
|
os_memcmp(mdie->mobility_domain,
|
|
sm->wpa_auth->conf.mobility_domain,
|
|
MOBILITY_DOMAIN_ID_LEN) != 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
|
|
return WLAN_STATUS_INVALID_MDIE;
|
|
}
|
|
|
|
ftie = (struct rsn_ftie *) parse.ftie;
|
|
if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
|
|
return WLAN_STATUS_INVALID_FTIE;
|
|
}
|
|
|
|
os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
|
|
|
|
if (parse.r0kh_id == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
|
|
return WLAN_STATUS_INVALID_FTIE;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
|
|
parse.r0kh_id, parse.r0kh_id_len);
|
|
os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
|
|
sm->r0kh_id_len = parse.r0kh_id_len;
|
|
|
|
if (parse.rsn_pmkid == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
|
|
return WLAN_STATUS_INVALID_PMKID;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
|
|
parse.rsn_pmkid, WPA_PMK_NAME_LEN);
|
|
wpa_derive_pmk_r1_name(parse.rsn_pmkid,
|
|
sm->wpa_auth->conf.r1_key_holder, sm->addr,
|
|
pmk_r1_name);
|
|
wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
|
|
pmk_r1_name, WPA_PMK_NAME_LEN);
|
|
|
|
if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1) <
|
|
0) {
|
|
if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
|
|
sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Did not have matching "
|
|
"PMK-R1 and unknown R0KH-ID");
|
|
return WLAN_STATUS_INVALID_PMKID;
|
|
}
|
|
|
|
/*
|
|
* TODO: Should return "status pending" (and the caller should
|
|
* not send out response now). The real response will be sent
|
|
* once the response from R0KH is received.
|
|
*/
|
|
return WLAN_STATUS_INVALID_PMKID;
|
|
}
|
|
|
|
wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
|
|
sm->pmk_r1_name_valid = 1;
|
|
os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
|
|
|
|
if (os_get_random(sm->ANonce, WPA_NONCE_LEN)) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
|
|
"ANonce");
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
|
|
sm->SNonce, WPA_NONCE_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
|
|
sm->ANonce, WPA_NONCE_LEN);
|
|
|
|
wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
|
|
sm->wpa_auth->addr, pmk_r1_name,
|
|
(u8 *) &sm->PTK, sizeof(sm->PTK), ptk_name);
|
|
wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
|
|
(u8 *) &sm->PTK, sizeof(sm->PTK));
|
|
wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
|
|
|
|
wpa_ft_install_ptk(sm);
|
|
|
|
buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
|
|
2 + FT_R1KH_ID_LEN + 200;
|
|
*resp_ies = os_zalloc(buflen);
|
|
if (*resp_ies == NULL) {
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
|
|
pos = *resp_ies;
|
|
end = *resp_ies + buflen;
|
|
|
|
ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
|
|
if (ret < 0) {
|
|
os_free(*resp_ies);
|
|
*resp_ies = NULL;
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
pos += ret;
|
|
|
|
ret = wpa_write_mdie(conf, pos, end - pos);
|
|
if (ret < 0) {
|
|
os_free(*resp_ies);
|
|
*resp_ies = NULL;
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
pos += ret;
|
|
|
|
ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
|
|
sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
|
|
if (ret < 0) {
|
|
os_free(*resp_ies);
|
|
*resp_ies = NULL;
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
pos += ret;
|
|
|
|
*resp_ies_len = pos - *resp_ies;
|
|
|
|
return WLAN_STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
|
|
u16 auth_transaction, const u8 *ies, size_t ies_len,
|
|
void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
|
|
u16 auth_transaction, u16 status,
|
|
const u8 *ies, size_t ies_len),
|
|
void *ctx)
|
|
{
|
|
u16 status;
|
|
u8 *resp_ies;
|
|
size_t resp_ies_len;
|
|
|
|
if (sm == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
|
|
"WPA SM not available");
|
|
return;
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
|
|
" BSSID=" MACSTR " transaction=%d",
|
|
MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
|
|
status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
|
|
&resp_ies_len);
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
|
|
" auth_transaction=%d status=%d",
|
|
MAC2STR(sm->addr), auth_transaction + 1, status);
|
|
wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
|
|
cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
|
|
resp_ies, resp_ies_len);
|
|
os_free(resp_ies);
|
|
}
|
|
|
|
|
|
u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
|
|
size_t ies_len)
|
|
{
|
|
struct wpa_ft_ies parse;
|
|
struct rsn_mdie *mdie;
|
|
struct rsn_ftie *ftie;
|
|
u8 mic[16];
|
|
|
|
if (sm == NULL)
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
|
|
wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
|
|
|
|
if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
|
|
if (parse.rsn == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
|
|
if (parse.rsn_pmkid == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
|
|
return WLAN_STATUS_INVALID_PMKID;
|
|
}
|
|
|
|
if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
|
|
"with the PMKR1Name derived from auth request");
|
|
return WLAN_STATUS_INVALID_PMKID;
|
|
}
|
|
|
|
mdie = (struct rsn_mdie *) parse.mdie;
|
|
if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
|
|
os_memcmp(mdie->mobility_domain,
|
|
sm->wpa_auth->conf.mobility_domain,
|
|
MOBILITY_DOMAIN_ID_LEN) != 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
|
|
return WLAN_STATUS_INVALID_MDIE;
|
|
}
|
|
|
|
ftie = (struct rsn_ftie *) parse.ftie;
|
|
if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
|
|
return WLAN_STATUS_INVALID_FTIE;
|
|
}
|
|
|
|
/*
|
|
* Assume that MDIE, FTIE, and RSN IE are protected and that there is
|
|
* no RIC, so total of 3 protected IEs.
|
|
*/
|
|
if (ftie->mic_control[1] != 3) {
|
|
wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in FTIE (%d)",
|
|
ftie->mic_control[1]);
|
|
return WLAN_STATUS_INVALID_FTIE;
|
|
}
|
|
|
|
if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
|
|
parse.mdie - 2, parse.mdie_len + 2,
|
|
parse.ftie - 2, parse.ftie_len + 2,
|
|
parse.rsn - 2, parse.rsn_len + 2, NULL, 0,
|
|
mic) < 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
|
|
return WLAN_STATUS_UNSPECIFIED_FAILURE;
|
|
}
|
|
|
|
if (os_memcmp(mic, ftie->mic, 16) != 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
|
|
wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
|
|
wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
|
|
return WLAN_STATUS_INVALID_FTIE;
|
|
}
|
|
|
|
return WLAN_STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
|
|
{
|
|
const u8 *sta_addr, *target_ap;
|
|
const u8 *ies;
|
|
size_t ies_len;
|
|
u8 action;
|
|
struct ft_rrb_frame *frame;
|
|
|
|
if (sm == NULL)
|
|
return -1;
|
|
|
|
/*
|
|
* data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
|
|
* FT Request action frame body[variable]
|
|
*/
|
|
|
|
if (len < 14) {
|
|
wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
|
|
"(len=%lu)", (unsigned long) len);
|
|
return -1;
|
|
}
|
|
|
|
action = data[1];
|
|
sta_addr = data + 2;
|
|
target_ap = data + 8;
|
|
ies = data + 14;
|
|
ies_len = len - 14;
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
|
|
" Target AP=" MACSTR " Action=%d)",
|
|
MAC2STR(sta_addr), MAC2STR(target_ap), action);
|
|
|
|
if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
|
|
"STA=" MACSTR " STA-Address=" MACSTR,
|
|
MAC2STR(sm->addr), MAC2STR(sta_addr));
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Do some sanity checking on the target AP address (not own and not
|
|
* broadcast. This could be extended to filter based on a list of known
|
|
* APs in the MD (if such a list were configured).
|
|
*/
|
|
if ((target_ap[0] & 0x01) ||
|
|
os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
|
|
"frame");
|
|
return -1;
|
|
}
|
|
|
|
wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
|
|
|
|
/* RRB - Forward action frame to the target AP */
|
|
frame = os_malloc(sizeof(*frame) + len);
|
|
frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
|
|
frame->packet_type = FT_PACKET_REQUEST;
|
|
frame->action_length = host_to_le16(len);
|
|
os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
|
|
os_memcpy(frame + 1, data, len);
|
|
|
|
wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
|
|
sizeof(*frame) + len);
|
|
os_free(frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
|
|
const u8 *current_ap, const u8 *sta_addr,
|
|
const u8 *body, size_t len)
|
|
{
|
|
struct wpa_state_machine *sm;
|
|
u16 status;
|
|
u8 *resp_ies, *pos;
|
|
size_t resp_ies_len, rlen;
|
|
struct ft_rrb_frame *frame;
|
|
|
|
sm = wpa_ft_add_sta(wpa_auth, sta_addr);
|
|
if (sm == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
|
|
"RRB Request");
|
|
return -1;
|
|
}
|
|
|
|
wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
|
|
|
|
status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
|
|
&resp_ies_len);
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
|
|
" CurrentAP=" MACSTR " status=%d",
|
|
MAC2STR(sm->addr), MAC2STR(current_ap), status);
|
|
wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
|
|
|
|
/* RRB - Forward action frame response to the Current AP */
|
|
|
|
/*
|
|
* data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
|
|
* Status_Code[2] FT Request action frame body[variable]
|
|
*/
|
|
rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
|
|
|
|
frame = os_malloc(sizeof(*frame) + rlen);
|
|
frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
|
|
frame->packet_type = FT_PACKET_RESPONSE;
|
|
frame->action_length = host_to_le16(rlen);
|
|
os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
|
|
pos = (u8 *) (frame + 1);
|
|
*pos++ = WLAN_ACTION_FT;
|
|
*pos++ = 2; /* Action: Response */
|
|
os_memcpy(pos, sta_addr, ETH_ALEN);
|
|
pos += ETH_ALEN;
|
|
os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
|
|
pos += ETH_ALEN;
|
|
WPA_PUT_LE16(pos, status);
|
|
pos += 2;
|
|
if (resp_ies) {
|
|
os_memcpy(pos, resp_ies, resp_ies_len);
|
|
os_free(resp_ies);
|
|
}
|
|
|
|
wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
|
|
sizeof(*frame) + rlen);
|
|
os_free(frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
|
|
const u8 *src_addr,
|
|
const u8 *data, size_t data_len)
|
|
{
|
|
struct ft_r0kh_r1kh_pull_frame *frame, f;
|
|
struct ft_remote_r1kh *r1kh;
|
|
struct ft_r0kh_r1kh_resp_frame resp, r;
|
|
u8 pmk_r0[PMK_LEN];
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
|
|
|
|
if (data_len < sizeof(*frame))
|
|
return -1;
|
|
|
|
r1kh = wpa_auth->conf.r1kh_list;
|
|
while (r1kh) {
|
|
if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
|
|
break;
|
|
r1kh = r1kh->next;
|
|
}
|
|
if (r1kh == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
|
|
"PMK-R1 pull source address " MACSTR,
|
|
MAC2STR(src_addr));
|
|
return -1;
|
|
}
|
|
|
|
frame = (struct ft_r0kh_r1kh_pull_frame *) data;
|
|
/* aes_unwrap() does not support inplace decryption, so use a temporary
|
|
* buffer for the data. */
|
|
if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
|
|
frame->nonce, f.nonce) < 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
|
|
"request from " MACSTR, MAC2STR(src_addr));
|
|
return -1;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
|
|
f.nonce, sizeof(f.nonce));
|
|
wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
|
|
f.pmk_r0_name, WPA_PMK_NAME_LEN);
|
|
wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
|
|
MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
|
|
|
|
os_memset(&resp, 0, sizeof(resp));
|
|
resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
|
|
resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
|
|
resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
|
|
os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
|
|
|
|
/* aes_wrap() does not support inplace encryption, so use a temporary
|
|
* buffer for the data. */
|
|
os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
|
|
os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
|
|
os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
|
|
if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0) <
|
|
0) {
|
|
wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
|
|
"PMK-R1 pull");
|
|
return -1;
|
|
}
|
|
|
|
wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
|
|
r.pmk_r1, r.pmk_r1_name);
|
|
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
|
|
WPA_PMK_NAME_LEN);
|
|
|
|
if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
|
|
r.nonce, resp.nonce) < 0) {
|
|
os_memset(pmk_r0, 0, PMK_LEN);
|
|
return -1;
|
|
}
|
|
|
|
os_memset(pmk_r0, 0, PMK_LEN);
|
|
|
|
wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
|
|
const u8 *src_addr,
|
|
const u8 *data, size_t data_len)
|
|
{
|
|
struct ft_r0kh_r1kh_resp_frame *frame, f;
|
|
struct ft_remote_r0kh *r0kh;
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
|
|
|
|
if (data_len < sizeof(*frame))
|
|
return -1;
|
|
|
|
r0kh = wpa_auth->conf.r0kh_list;
|
|
while (r0kh) {
|
|
if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
|
|
break;
|
|
r0kh = r0kh->next;
|
|
}
|
|
if (r0kh == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
|
|
"PMK-R0 pull response source address " MACSTR,
|
|
MAC2STR(src_addr));
|
|
return -1;
|
|
}
|
|
|
|
frame = (struct ft_r0kh_r1kh_resp_frame *) data;
|
|
/* aes_unwrap() does not support inplace decryption, so use a temporary
|
|
* buffer for the data. */
|
|
if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
|
|
frame->nonce, f.nonce) < 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
|
|
"response from " MACSTR, MAC2STR(src_addr));
|
|
return -1;
|
|
}
|
|
|
|
if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
|
|
!= 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
|
|
"matching R1KH-ID");
|
|
return -1;
|
|
}
|
|
|
|
/* TODO: verify that <nonce,s1kh_id> matches with a pending request
|
|
* and call this requests callback function to finish request
|
|
* processing */
|
|
|
|
wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
|
|
f.nonce, sizeof(f.nonce));
|
|
wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
|
|
MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
|
|
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
|
|
f.pmk_r1, PMK_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
|
|
f.pmk_r1_name, WPA_PMK_NAME_LEN);
|
|
|
|
wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
|
|
os_memset(f.pmk_r1, 0, PMK_LEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
|
|
const u8 *src_addr,
|
|
const u8 *data, size_t data_len)
|
|
{
|
|
struct ft_r0kh_r1kh_push_frame *frame, f;
|
|
struct ft_remote_r0kh *r0kh;
|
|
struct os_time now;
|
|
os_time_t tsend;
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
|
|
|
|
if (data_len < sizeof(*frame))
|
|
return -1;
|
|
|
|
r0kh = wpa_auth->conf.r0kh_list;
|
|
while (r0kh) {
|
|
if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
|
|
break;
|
|
r0kh = r0kh->next;
|
|
}
|
|
if (r0kh == NULL) {
|
|
wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
|
|
"PMK-R0 push source address " MACSTR,
|
|
MAC2STR(src_addr));
|
|
return -1;
|
|
}
|
|
|
|
frame = (struct ft_r0kh_r1kh_push_frame *) data;
|
|
/* aes_unwrap() does not support inplace decryption, so use a temporary
|
|
* buffer for the data. */
|
|
if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
|
|
frame->timestamp, f.timestamp) < 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
|
|
MACSTR, MAC2STR(src_addr));
|
|
return -1;
|
|
}
|
|
|
|
os_get_time(&now);
|
|
tsend = WPA_GET_LE32(f.timestamp);
|
|
if ((now.sec > tsend && now.sec - tsend > 60) ||
|
|
(now.sec < tsend && tsend - now.sec > 60)) {
|
|
wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
|
|
"timestamp: sender time %d own time %d\n",
|
|
(int) tsend, (int) now.sec);
|
|
return -1;
|
|
}
|
|
|
|
if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
|
|
!= 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
|
|
"R1KH-ID (received " MACSTR " own " MACSTR ")",
|
|
MAC2STR(f.r1kh_id),
|
|
MAC2STR(wpa_auth->conf.r1_key_holder));
|
|
return -1;
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
|
|
MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
|
|
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
|
|
f.pmk_r1, PMK_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
|
|
f.pmk_r1_name, WPA_PMK_NAME_LEN);
|
|
|
|
wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
|
|
os_memset(f.pmk_r1, 0, PMK_LEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
|
|
const u8 *data, size_t data_len)
|
|
{
|
|
struct ft_rrb_frame *frame;
|
|
u16 alen;
|
|
const u8 *pos, *end, *start;
|
|
u8 action;
|
|
const u8 *sta_addr, *target_ap_addr;
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
|
|
MAC2STR(src_addr));
|
|
|
|
if (data_len < sizeof(*frame)) {
|
|
wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
|
|
(unsigned long) data_len);
|
|
return -1;
|
|
}
|
|
|
|
pos = data;
|
|
frame = (struct ft_rrb_frame *) pos;
|
|
pos += sizeof(*frame);
|
|
|
|
alen = le_to_host16(frame->action_length);
|
|
wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
|
|
"action_length=%d ap_address=" MACSTR,
|
|
frame->frame_type, frame->packet_type, alen,
|
|
MAC2STR(frame->ap_address));
|
|
|
|
if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
|
|
/* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
|
|
wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
|
|
"unrecognized type %d", frame->frame_type);
|
|
return -1;
|
|
}
|
|
|
|
if (alen > data_len - sizeof(*frame)) {
|
|
wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
|
|
"frame");
|
|
return -1;
|
|
}
|
|
|
|
if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
|
|
return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
|
|
if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
|
|
return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
|
|
if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
|
|
return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
|
|
|
|
wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
|
|
|
|
if (alen < 1 + 1 + 2 * ETH_ALEN) {
|
|
wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
|
|
"room for Action Frame body); alen=%lu",
|
|
(unsigned long) alen);
|
|
return -1;
|
|
}
|
|
start = pos;
|
|
end = pos + alen;
|
|
|
|
if (*pos != WLAN_ACTION_FT) {
|
|
wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
|
|
"%d", *pos);
|
|
return -1;
|
|
}
|
|
|
|
pos++;
|
|
action = *pos++;
|
|
sta_addr = pos;
|
|
pos += ETH_ALEN;
|
|
target_ap_addr = pos;
|
|
pos += ETH_ALEN;
|
|
wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
|
|
MACSTR " target_ap_addr=" MACSTR,
|
|
action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
|
|
|
|
if (frame->packet_type == FT_PACKET_REQUEST) {
|
|
wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
|
|
|
|
if (action != 1) {
|
|
wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
|
|
"RRB Request", action);
|
|
return -1;
|
|
}
|
|
|
|
if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
|
|
wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
|
|
"RRB Request does not match with own "
|
|
"address");
|
|
return -1;
|
|
}
|
|
|
|
if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
|
|
sta_addr, pos, end - pos) < 0)
|
|
return -1;
|
|
} else if (frame->packet_type == FT_PACKET_RESPONSE) {
|
|
u16 status_code;
|
|
|
|
if (end - pos < 2) {
|
|
wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
|
|
"code in RRB Response");
|
|
return -1;
|
|
}
|
|
status_code = WPA_GET_LE16(pos);
|
|
pos += 2;
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
|
|
"(status_code=%d)", status_code);
|
|
|
|
if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
|
|
return -1;
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
|
|
"packet_type %d", frame->packet_type);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
|
|
struct wpa_ft_pmk_r0_sa *pmk_r0,
|
|
struct ft_remote_r1kh *r1kh,
|
|
const u8 *s1kh_id)
|
|
{
|
|
struct ft_r0kh_r1kh_push_frame frame, f;
|
|
struct os_time now;
|
|
|
|
os_memset(&frame, 0, sizeof(frame));
|
|
frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
|
|
frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
|
|
frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
|
|
os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
|
|
|
|
/* aes_wrap() does not support inplace encryption, so use a temporary
|
|
* buffer for the data. */
|
|
os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
|
|
os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
|
|
os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
|
|
wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
|
|
s1kh_id, f.pmk_r1, f.pmk_r1_name);
|
|
wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
|
|
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
|
|
WPA_PMK_NAME_LEN);
|
|
os_get_time(&now);
|
|
WPA_PUT_LE32(f.timestamp, now.sec);
|
|
if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
|
|
f.timestamp, frame.timestamp) < 0)
|
|
return;
|
|
|
|
wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
|
|
}
|
|
|
|
|
|
void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
|
|
{
|
|
struct wpa_ft_pmk_r0_sa *r0;
|
|
struct ft_remote_r1kh *r1kh;
|
|
|
|
if (!wpa_auth->conf.pmk_r1_push)
|
|
return;
|
|
|
|
r0 = wpa_auth->ft_pmk_cache->pmk_r0;
|
|
while (r0) {
|
|
if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
|
|
break;
|
|
r0 = r0->next;
|
|
}
|
|
|
|
if (r0 == NULL || r0->pmk_r1_pushed)
|
|
return;
|
|
r0->pmk_r1_pushed = 1;
|
|
|
|
wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
|
|
"for STA " MACSTR, MAC2STR(addr));
|
|
|
|
r1kh = wpa_auth->conf.r1kh_list;
|
|
while (r1kh) {
|
|
wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
|
|
r1kh = r1kh->next;
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_IEEE80211R */
|