DGNum/hostapd
6
0
Fork 0
Code Issues Pull requests 1 Projects Releases Packages Wiki Activity Actions
hostapd/src/ap/wpa_auth_ft.c
Hong Wu c284b46141 FT: Fix the calculation of MIC Control field in FTIE 
Reassociation Request/Response frame validation need to count all IEs in
the RIC. In addition, TIE is not protected, so it should not be included
in the count.

Signed-off-by: Hong Wu <hong.wu@dspg.com>
2011-07-16 10:57:17 +03:00

1779 lines
47 KiB
C
Raw Blame History

/*
* hostapd - IEEE 802.11r - Fast BSS Transition
* Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "crypto/aes_wrap.h"
#include "crypto/random.h"
#include "ap_config.h"
#include "ieee802_11.h"
#include "wmm.h"
#include "wpa_auth.h"
#include "wpa_auth_i.h"
#include "wpa_auth_ie.h"
#ifdef CONFIG_IEEE80211R
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;
const u8 *ric;
size_t ric_len;
};
static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
struct wpa_ft_ies *parse);
static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
const u8 *data, size_t data_len)
{
if (wpa_auth->cb.send_ether == NULL)
return -1;
wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
data, data_len);
}
static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
const u8 *dst, const u8 *data, size_t data_len)
{
if (wpa_auth->cb.send_ft_action == NULL)
return -1;
return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
data, data_len);
}
static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
{
if (wpa_auth->cb.add_sta == NULL)
return NULL;
return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
}
int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
{
u8 *pos = buf;
u8 capab;
if (len < 2 + sizeof(struct rsn_mdie))
return -1;
*pos++ = WLAN_EID_MOBILITY_DOMAIN;
*pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
pos += MOBILITY_DOMAIN_ID_LEN;
capab = 0;
if (conf->ft_over_ds)
capab |= RSN_FT_CAPAB_FT_OVER_DS;
*pos++ = capab;
return pos - buf;
}
int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
size_t r0kh_id_len,
const u8 *anonce, const u8 *snonce,
u8 *buf, size_t len, const u8 *subelem,
size_t subelem_len)
{
u8 *pos = buf, *ielen;
struct rsn_ftie *hdr;
if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
subelem_len)
return -1;
*pos++ = WLAN_EID_FAST_BSS_TRANSITION;
ielen = pos++;
hdr = (struct rsn_ftie *) pos;
os_memset(hdr, 0, sizeof(*hdr));
pos += sizeof(*hdr);
WPA_PUT_LE16(hdr->mic_control, 0);
if (anonce)
os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
if (snonce)
os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
/* Optional Parameters */
*pos++ = FTIE_SUBELEM_R1KH_ID;
*pos++ = FT_R1KH_ID_LEN;
os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
pos += FT_R1KH_ID_LEN;
if (r0kh_id) {
*pos++ = FTIE_SUBELEM_R0KH_ID;
*pos++ = r0kh_id_len;
os_memcpy(pos, r0kh_id, r0kh_id_len);
pos += r0kh_id_len;
}
if (subelem) {
os_memcpy(pos, subelem, subelem_len);
pos += subelem_len;
}
*ielen = pos - buf - 2;
return pos - buf;
}
struct wpa_ft_pmk_r0_sa {
struct wpa_ft_pmk_r0_sa *next;
u8 pmk_r0[PMK_LEN];
u8 pmk_r0_name[WPA_PMK_NAME_LEN];
u8 spa[ETH_ALEN];
int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
/* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
int pmk_r1_pushed;
};
struct wpa_ft_pmk_r1_sa {
struct wpa_ft_pmk_r1_sa *next;
u8 pmk_r1[PMK_LEN];
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
u8 spa[ETH_ALEN];
int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
/* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
};
struct wpa_ft_pmk_cache {
struct wpa_ft_pmk_r0_sa *pmk_r0;
struct wpa_ft_pmk_r1_sa *pmk_r1;
};
struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
{
struct wpa_ft_pmk_cache *cache;
cache = os_zalloc(sizeof(*cache));
return cache;
}
void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
{
struct wpa_ft_pmk_r0_sa *r0, *r0prev;
struct wpa_ft_pmk_r1_sa *r1, *r1prev;
r0 = cache->pmk_r0;
while (r0) {
r0prev = r0;
r0 = r0->next;
os_memset(r0prev->pmk_r0, 0, PMK_LEN);
os_free(r0prev);
}
r1 = cache->pmk_r1;
while (r1) {
r1prev = r1;
r1 = r1->next;
os_memset(r1prev->pmk_r1, 0, PMK_LEN);
os_free(r1prev);
}
os_free(cache);
}
static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r0,
const u8 *pmk_r0_name, int pairwise)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r0_sa *r0;
/* TODO: add expiration and limit on number of entries in cache */
r0 = os_zalloc(sizeof(*r0));
if (r0 == NULL)
return -1;
os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
os_memcpy(r0->spa, spa, ETH_ALEN);
r0->pairwise = pairwise;
r0->next = cache->pmk_r0;
cache->pmk_r0 = r0;
return 0;
}
static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r0_name,
u8 *pmk_r0, int *pairwise)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r0_sa *r0;
r0 = cache->pmk_r0;
while (r0) {
if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
== 0) {
os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
if (pairwise)
*pairwise = r0->pairwise;
return 0;
}
r0 = r0->next;
}
return -1;
}
static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r1,
const u8 *pmk_r1_name, int pairwise)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r1_sa *r1;
/* TODO: add expiration and limit on number of entries in cache */
r1 = os_zalloc(sizeof(*r1));
if (r1 == NULL)
return -1;
os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
os_memcpy(r1->spa, spa, ETH_ALEN);
r1->pairwise = pairwise;
r1->next = cache->pmk_r1;
cache->pmk_r1 = r1;
return 0;
}
static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r1_name,
u8 *pmk_r1, int *pairwise)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r1_sa *r1;
r1 = cache->pmk_r1;
while (r1) {
if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
== 0) {
os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
if (pairwise)
*pairwise = r1->pairwise;
return 0;
}
r1 = r1->next;
}
return -1;
}
static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth,
const u8 *s1kh_id, const u8 *r0kh_id,
size_t r0kh_id_len, const u8 *pmk_r0_name)
{
struct ft_remote_r0kh *r0kh;
struct ft_r0kh_r1kh_pull_frame frame, f;
r0kh = wpa_auth->conf.r0kh_list;
while (r0kh) {
if (r0kh->id_len == r0kh_id_len &&
os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0)
break;
r0kh = r0kh->next;
}
if (r0kh == NULL)
return -1;
wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
"address " MACSTR, MAC2STR(r0kh->addr));
os_memset(&frame, 0, sizeof(frame));
frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_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. */
if (random_get_bytes(f.nonce, sizeof(f.nonce))) {
wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
"nonce");
return -1;
}
os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
f.nonce, frame.nonce) < 0)
return -1;
wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
return 0;
}
int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
struct wpa_ptk *ptk, size_t ptk_len)
{
u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
u8 pmk_r1[PMK_LEN];
u8 ptk_name[WPA_PMK_NAME_LEN];
const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
const u8 *ssid = sm->wpa_auth->conf.ssid;
size_t ssid_len = sm->wpa_auth->conf.ssid_len;
if (sm->xxkey_len == 0) {
wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
"derivation");
return -1;
}
wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
sm->pairwise);
wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
pmk_r1, sm->pmk_r1_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
WPA_PMK_NAME_LEN);
wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
sm->pairwise);
wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
sm->wpa_auth->addr, sm->pmk_r1_name,
(u8 *) ptk, ptk_len, ptk_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
return 0;
}
static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
const u8 *addr, int idx, u8 *seq)
{
if (wpa_auth->cb.get_seqnum == NULL)
return -1;
return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
}
static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
u8 *subelem;
struct wpa_group *gsm = sm->group;
size_t subelem_len, pad_len;
const u8 *key;
size_t key_len;
u8 keybuf[32];
key_len = gsm->GTK_len;
if (key_len > sizeof(keybuf))
return NULL;
/*
* Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
* than 16 bytes.
*/
pad_len = key_len % 8;
if (pad_len)
pad_len = 8 - pad_len;
if (key_len + pad_len < 16)
pad_len += 8;
if (pad_len) {
os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
os_memset(keybuf + key_len, 0, pad_len);
keybuf[key_len] = 0xdd;
key_len += pad_len;
key = keybuf;
} else
key = gsm->GTK[gsm->GN - 1];
/*
* Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
* Key[5..32].
*/
subelem_len = 13 + key_len + 8;
subelem = os_zalloc(subelem_len);
if (subelem == NULL)
return NULL;
subelem[0] = FTIE_SUBELEM_GTK;
subelem[1] = 11 + key_len + 8;
/* Key ID in B0-B1 of Key Info */
WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
subelem[4] = gsm->GTK_len;
wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) {
os_free(subelem);
return NULL;
}
*len = subelem_len;
return subelem;
}
#ifdef CONFIG_IEEE80211W
static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
{
u8 *subelem, *pos;
struct wpa_group *gsm = sm->group;
size_t subelem_len;
/* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
* Key[16+8] */
subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
subelem = os_zalloc(subelem_len);
if (subelem == NULL)
return NULL;
pos = subelem;
*pos++ = FTIE_SUBELEM_IGTK;
*pos++ = subelem_len - 2;
WPA_PUT_LE16(pos, gsm->GN_igtk);
pos += 2;
wpa_auth_get_seqnum(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 */
static u8 * wpa_ft_process_rdie(u8 *pos, u8 *end, u8 id, u8 descr_count,
const u8 *ies, size_t ies_len)
{
struct ieee802_11_elems parse;
struct rsn_rdie *rdie;
wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
id, descr_count);
wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
ies, ies_len);
if (end - pos < (int) sizeof(*rdie)) {
wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
return pos;
}
*pos++ = WLAN_EID_RIC_DATA;
*pos++ = sizeof(*rdie);
rdie = (struct rsn_rdie *) pos;
rdie->id = id;
rdie->descr_count = 0;
rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
pos += sizeof(*rdie);
if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
ParseFailed) {
wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
rdie->status_code =
host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
return pos;
}
#ifdef NEED_AP_MLME
if (parse.wmm_tspec) {
struct wmm_tspec_element *tspec;
int res;
if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
"(%d)", (int) parse.wmm_tspec_len);
rdie->status_code =
host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
return pos;
}
if (end - pos < (int) sizeof(*tspec)) {
wpa_printf(MSG_ERROR, "FT: Not enough room for "
"response TSPEC");
rdie->status_code =
host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
return pos;
}
tspec = (struct wmm_tspec_element *) pos;
os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
res = wmm_process_tspec(tspec);
wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
rdie->status_code =
host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
else if (res == WMM_ADDTS_STATUS_REFUSED)
rdie->status_code =
host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
else {
/* TSPEC accepted; include updated TSPEC in response */
rdie->descr_count = 1;
pos += sizeof(*tspec);
}
return pos;
}
#endif /* NEED_AP_MLME */
wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
return pos;
}
static u8 * wpa_ft_process_ric(u8 *pos, u8 *end, const u8 *ric, size_t ric_len)
{
const u8 *rpos, *start;
const struct rsn_rdie *rdie;
wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
rpos = ric;
while (rpos + sizeof(*rdie) < ric + ric_len) {
if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
rpos + 2 + rpos[1] > ric + ric_len)
break;
rdie = (const struct rsn_rdie *) (rpos + 2);
rpos += 2 + rpos[1];
start = rpos;
while (rpos + 2 <= ric + ric_len &&
rpos + 2 + rpos[1] <= ric + ric_len) {
if (rpos[0] == WLAN_EID_RIC_DATA)
break;
rpos += 2 + rpos[1];
}
pos = wpa_ft_process_rdie(pos, end, rdie->id,
rdie->descr_count,
start, rpos - start);
}
return pos;
}
u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
size_t max_len, int auth_alg,
const u8 *req_ies, size_t req_ies_len)
{
u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
int res;
struct wpa_auth_config *conf;
struct rsn_ftie *_ftie;
struct wpa_ft_ies parse;
u8 *ric_start;
u8 *anonce, *snonce;
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;
if (auth_alg == WLAN_AUTH_FT) {
/*
* RSN (only present if this is a Reassociation Response and
* part of a fast BSS transition)
*/
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;
anonce = sm->ANonce;
snonce = sm->SNonce;
#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;
anonce = NULL;
snonce = NULL;
}
res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
end - pos, subelem, subelem_len);
os_free(subelem);
if (res < 0)
return pos;
ftie = pos;
ftie_len = res;
pos += res;
os_free(sm->assoc_resp_ftie);
sm->assoc_resp_ftie = os_malloc(ftie_len);
if (sm->assoc_resp_ftie)
os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
_ftie = (struct rsn_ftie *) (ftie + 2);
if (auth_alg == WLAN_AUTH_FT)
_ftie->mic_control[1] = 3; /* Information element count */
ric_start = pos;
if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
pos = wpa_ft_process_ric(pos, end, parse.ric, parse.ric_len);
if (auth_alg == WLAN_AUTH_FT)
_ftie->mic_control[1] +=
ieee802_11_ie_count(ric_start,
pos - ric_start);
}
if (ric_start == pos)
ric_start = NULL;
if (auth_alg == WLAN_AUTH_FT &&
wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
mdie, mdie_len, ftie, ftie_len,
rsnie, rsnie_len,
ric_start, ric_start ? pos - ric_start : 0,
_ftie->mic) < 0)
wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
return pos;
}
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;
const struct rsn_ftie *ftie;
int prot_ie_count = 0;
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 (pos[1] < sizeof(*ftie))
return -1;
ftie = (const struct rsn_ftie *) (pos + 2);
prot_ie_count = ftie->mic_control[1];
if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
return -1;
break;
case WLAN_EID_RIC_DATA:
if (parse->ric == NULL)
parse->ric = pos;
}
pos += 2 + pos[1];
}
if (prot_ie_count == 0)
return 0; /* no MIC */
/*
* Check that the protected IE count matches with IEs included in the
* frame.
*/
if (parse->rsn)
prot_ie_count--;
if (parse->mdie)
prot_ie_count--;
if (parse->ftie)
prot_ie_count--;
if (prot_ie_count < 0) {
wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
"the protected IE count");
return -1;
}
if (prot_ie_count == 0 && parse->ric) {
wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
"included in protected IE count");
return -1;
}
/* Determine the end of the RIC IE(s) */
pos = parse->ric;
while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
prot_ie_count) {
prot_ie_count--;
pos += 2 + pos[1];
}
parse->ric_len = pos - parse->ric;
if (prot_ie_count) {
wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
"frame", (int) prot_ie_count);
return -1;
}
return 0;
}
static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
int vlan_id,
enum wpa_alg 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);
}
void wpa_ft_install_ptk(struct wpa_state_machine *sm)
{
enum wpa_alg alg;
int klen;
/* MLME-SETKEYS.request(PTK) */
if (sm->pairwise == WPA_CIPHER_TKIP) {
alg = WPA_ALG_TKIP;
klen = 32;
} else if (sm->pairwise == WPA_CIPHER_CCMP) {
alg = WPA_ALG_CCMP;
klen = 16;
} else {
wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
"PTK configuration", sm->pairwise);
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. This function will be called
* again after association to get the PTK configured, but that could be
* optimized by adding the STA entry earlier.
*/
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, ptk_len;
int ret;
u8 *pos, *end;
int pairwise;
*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,
&pairwise) < 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 (random_get_bytes(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);
ptk_len = pairwise != WPA_CIPHER_CCMP ? 64 : 48;
wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
sm->wpa_auth->addr, pmk_r1_name,
(u8 *) &sm->PTK, ptk_len, ptk_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
(u8 *) &sm->PTK, ptk_len);
wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
sm->pairwise = pairwise;
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];
unsigned int count;
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;
}
if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
ftie->snonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
sm->SNonce, WPA_NONCE_LEN);
return -1;
}
if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
ftie->anonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
sm->ANonce, WPA_NONCE_LEN);
return -1;
}
if (parse.r0kh_id == NULL) {
wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
return -1;
}
if (parse.r0kh_id_len != sm->r0kh_id_len ||
os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
"the current R0KH-ID");
wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
parse.r0kh_id, parse.r0kh_id_len);
wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
sm->r0kh_id, sm->r0kh_id_len);
return -1;
}
if (parse.r1kh_id == NULL) {
wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
return -1;
}
if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
FT_R1KH_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
"ReassocReq");
wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
parse.r1kh_id, FT_R1KH_ID_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
return -1;
}
if (parse.rsn_pmkid == NULL ||
os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
"RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
return -1;
}
count = 3;
if (parse.ric)
count += ieee802_11_ie_count(parse.ric, parse.ric_len);
if (ftie->mic_control[1] != count) {
wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
"Control: received %u expected %u",
ftie->mic_control[1], count);
return -1;
}
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,
parse.ric, parse.ric_len,
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];
int pairwise;
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,
&pairwise) < 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);
r.pairwise = host_to_le16(pairwise);
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;
int pairwise;
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 */
pairwise = le_to_host16(f.pairwise);
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 " pairwise=0x%x",
MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
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,
pairwise);
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;
int pairwise;
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;
}
pairwise = le_to_host16(f.pairwise);
wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
MACSTR " pairwise=0x%x",
MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
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,
pairwise);
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, int pairwise)
{
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);
f.pairwise = host_to_le16(pairwise);
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, r0->pairwise);
r1kh = r1kh->next;
}
}
#endif /* CONFIG_IEEE80211R */
Reference in a new issue View git blame Copy permalink