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/*
* WPA Supplicant - IEEE 802.11r - Fast BSS Transition
* Copyright (c) 2006-2018, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/aes_wrap.h"
#include "crypto/random.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "wpa.h"
#include "wpa_i.h"
#ifdef CONFIG_IEEE80211R
#define DEFAULT_KEK_LEN 16
int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
{
u8 ptk_name[WPA_PMK_NAME_LEN];
const u8 *anonce = key->key_nonce;
if (sm->xxkey_len == 0) {
wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
"derivation");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "FT: xxkey", sm->xxkey, sm->xxkey_len);
wpa_hexdump_key(MSG_DEBUG, "FT: ssid", sm->ssid, sm->ssid_len);
wpa_hexdump_key(MSG_DEBUG, "FT: r0kh_id", sm->r0kh_id, sm->r0kh_id_len);
wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
sm->ssid_len, sm->mobility_domain,
sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
sm->pmk_r0, sm->pmk_r0_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
sm->pmk_r0_name, WPA_PMK_NAME_LEN);
wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
WPA_PMK_NAME_LEN);
return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
sm->bssid, sm->pmk_r1_name, ptk, ptk_name,
sm->key_mgmt, sm->pairwise_cipher);
}
/**
* wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @ies: Association Response IEs or %NULL to clear FT parameters
* @ies_len: Length of ies buffer in octets
* Returns: 0 on success, -1 on failure
*/
int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
{
struct wpa_ft_ies ft;
if (sm == NULL)
return 0;
if (!get_ie(ies, ies_len, WLAN_EID_MOBILITY_DOMAIN)) {
os_free(sm->assoc_resp_ies);
sm->assoc_resp_ies = NULL;
sm->assoc_resp_ies_len = 0;
os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
os_memset(sm->r0kh_id, 0, FT_R0KH_ID_MAX_LEN);
sm->r0kh_id_len = 0;
os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
sm->ft_protocol = 0;
return 0;
}
if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
return -1;
if (ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
return -1;
wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
ft.mdie, MOBILITY_DOMAIN_ID_LEN);
os_memcpy(sm->mobility_domain, ft.mdie, MOBILITY_DOMAIN_ID_LEN);
sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
sm->mdie_ft_capab);
if (ft.r0kh_id) {
wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
ft.r0kh_id, ft.r0kh_id_len);
os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
sm->r0kh_id_len = ft.r0kh_id_len;
} else {
/* FIX: When should R0KH-ID be cleared? We need to keep the
* old R0KH-ID in order to be able to use this during FT. */
/*
* os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
* sm->r0kh_id_len = 0;
*/
}
if (ft.r1kh_id) {
wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
ft.r1kh_id, FT_R1KH_ID_LEN);
os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
} else
os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
os_free(sm->assoc_resp_ies);
sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
if (sm->assoc_resp_ies) {
u8 *pos = sm->assoc_resp_ies;
os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
pos += ft.mdie_len + 2;
if (ft.ftie) {
os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
pos += ft.ftie_len + 2;
}
sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
"(Re)Association Response",
sm->assoc_resp_ies, sm->assoc_resp_ies_len);
}
return 0;
}
/**
* wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @len: Buffer for returning the length of the IEs
* @anonce: ANonce or %NULL if not yet available
* @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
* @kck: 128-bit KCK for MIC or %NULL if no MIC is used
* @kck_len: KCK length in octet
* @target_ap: Target AP address
* @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
* @ric_ies_len: Length of ric_ies buffer in octets
* @ap_mdie: Mobility Domain IE from the target AP
* Returns: Pointer to buffer with IEs or %NULL on failure
*
* Caller is responsible for freeing the returned buffer with os_free();
*/
static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
const u8 *anonce, const u8 *pmk_name,
const u8 *kck, size_t kck_len,
const u8 *target_ap,
const u8 *ric_ies, size_t ric_ies_len,
const u8 *ap_mdie)
{
size_t buf_len;
u8 *buf, *pos, *ftie_len, *ftie_pos;
struct rsn_mdie *mdie;
struct rsn_ftie *ftie;
struct rsn_ie_hdr *rsnie;
int mdie_len;
u16 capab;
sm->ft_completed = 0;
buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
2 + sm->r0kh_id_len + ric_ies_len + 100;
buf = os_zalloc(buf_len);
if (buf == NULL)
return NULL;
pos = buf;
/* RSNIE[PMKR0Name/PMKR1Name] */
rsnie = (struct rsn_ie_hdr *) pos;
rsnie->elem_id = WLAN_EID_RSN;
WPA_PUT_LE16(rsnie->version, RSN_VERSION);
pos = (u8 *) (rsnie + 1);
/* Group Suite Selector */
if (sm->group_cipher != WPA_CIPHER_CCMP &&
sm->group_cipher != WPA_CIPHER_GCMP &&
sm->group_cipher != WPA_CIPHER_TKIP) {
wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
sm->group_cipher);
os_free(buf);
return NULL;
}
RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
sm->group_cipher));
pos += RSN_SELECTOR_LEN;
/* Pairwise Suite Count */
WPA_PUT_LE16(pos, 1);
pos += 2;
/* Pairwise Suite List */
if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
sm->pairwise_cipher);
os_free(buf);
return NULL;
}
RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
sm->pairwise_cipher));
pos += RSN_SELECTOR_LEN;
/* Authenticated Key Management Suite Count */
WPA_PUT_LE16(pos, 1);
pos += 2;
/* Authenticated Key Management Suite List */
if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
else {
wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
sm->key_mgmt);
os_free(buf);
return NULL;
}
pos += RSN_SELECTOR_LEN;
/* RSN Capabilities */
capab = 0;
#ifdef CONFIG_IEEE80211W
if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
capab |= WPA_CAPABILITY_MFPC;
#endif /* CONFIG_IEEE80211W */
WPA_PUT_LE16(pos, capab);
pos += 2;
/* PMKID Count */
WPA_PUT_LE16(pos, 1);
pos += 2;
/* PMKID List [PMKR0Name/PMKR1Name] */
os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
pos += WPA_PMK_NAME_LEN;
#ifdef CONFIG_IEEE80211W
if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
/* Management Group Cipher Suite */
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
pos += RSN_SELECTOR_LEN;
}
#endif /* CONFIG_IEEE80211W */
rsnie->len = (pos - (u8 *) rsnie) - 2;
/* MDIE */
mdie_len = wpa_ft_add_mdie(sm, pos, buf_len - (pos - buf), ap_mdie);
if (mdie_len <= 0) {
os_free(buf);
return NULL;
}
mdie = (struct rsn_mdie *) (pos + 2);
pos += mdie_len;
/* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
ftie_pos = pos;
*pos++ = WLAN_EID_FAST_BSS_TRANSITION;
ftie_len = pos++;
ftie = (struct rsn_ftie *) pos;
pos += sizeof(*ftie);
os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
if (anonce)
os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
if (kck) {
/* R1KH-ID sub-element in third FT message */
*pos++ = FTIE_SUBELEM_R1KH_ID;
*pos++ = FT_R1KH_ID_LEN;
os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
pos += FT_R1KH_ID_LEN;
}
/* R0KH-ID sub-element */
*pos++ = FTIE_SUBELEM_R0KH_ID;
*pos++ = sm->r0kh_id_len;
os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
pos += sm->r0kh_id_len;
*ftie_len = pos - ftie_len - 1;
if (ric_ies) {
/* RIC Request */
os_memcpy(pos, ric_ies, ric_ies_len);
pos += ric_ies_len;
}
if (kck) {
/*
* IEEE Std 802.11r-2008, 11A.8.4
* MIC shall be calculated over:
* non-AP STA MAC address
* Target AP MAC address
* Transaction seq number (5 for ReassocReq, 3 otherwise)
* RSN IE
* MDIE
* FTIE (with MIC field set to 0)
* RIC-Request (if present)
*/
/* Information element count */
ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
ric_ies_len);
if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
((u8 *) mdie) - 2, 2 + sizeof(*mdie),
ftie_pos, 2 + *ftie_len,
(u8 *) rsnie, 2 + rsnie->len, ric_ies,
ric_ies_len, ftie->mic) < 0) {
wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
os_free(buf);
return NULL;
}
}
*len = pos - buf;
return buf;
}
static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
{
int keylen;
enum wpa_alg alg;
u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
sm->pairwise_cipher);
return -1;
}
alg = wpa_cipher_to_alg(sm->pairwise_cipher);
keylen = wpa_cipher_key_len(sm->pairwise_cipher);
if (wpa_sm_set_key(&(sm->install_ptk), alg, (u8 *)bssid, 0, 1, null_rsc,
sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen, KEY_FLAG_PAIRWISE) < 0) {
wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
return -1;
}
return 0;
}
/**
* wpa_ft_prepare_auth_request - Generate over-the-air auth request
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @mdie: Target AP MDIE
* Returns: 0 on success, -1 on failure
*/
int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
{
u8 *ft_ies;
size_t ft_ies_len;
/* Generate a new SNonce */
if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
return -1;
}
ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
NULL, 0, sm->bssid, NULL, 0, mdie);
if (ft_ies) {
wpa_sm_update_ft_ies(sm, sm->mobility_domain,
ft_ies, ft_ies_len, true);
os_free(ft_ies);
}
return 0;
}
int wpa_ft_add_mdie(struct wpa_sm *sm, u8 *buf, size_t buf_len,
const u8 *ap_mdie)
{
u8 *pos = buf;
struct rsn_mdie *mdie;
if (buf_len < 2 + sizeof(*mdie)) {
wpa_printf(MSG_INFO,
"FT: Failed to add MDIE: short buffer, length=%zu",
buf_len);
return 0;
}
*pos++ = WLAN_EID_MOBILITY_DOMAIN;
*pos++ = sizeof(*mdie);
mdie = (struct rsn_mdie *) pos;
os_memcpy(mdie->mobility_domain, sm->mobility_domain,
MOBILITY_DOMAIN_ID_LEN);
mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
sm->mdie_ft_capab;
return 2 + sizeof(*mdie);
}
const u8 * wpa_sm_get_ft_md(struct wpa_sm *sm)
{
return sm->mobility_domain;
}
int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
int ft_action, const u8 *target_ap,
const u8 *ric_ies, size_t ric_ies_len)
{
u8 *ft_ies;
size_t ft_ies_len;
struct wpa_ft_ies parse;
struct rsn_mdie *mdie;
struct rsn_ftie *ftie;
u8 ptk_name[WPA_PMK_NAME_LEN];
int ret;
const u8 *bssid;
wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
if (ft_action) {
if (!sm->over_the_ds_in_progress) {
wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
"- drop FT Action Response");
return -1;
}
if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
"with this Target AP - drop FT Action "
"Response");
return -1;
}
}
if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
"enabled for this connection");
return -1;
}
if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
return -1;
}
mdie = (struct rsn_mdie *) parse.mdie;
if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
os_memcmp(mdie->mobility_domain, sm->mobility_domain,
MOBILITY_DOMAIN_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
return -1;
}
ftie = (struct rsn_ftie *) parse.ftie;
if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
return -1;
}
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 (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_const(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 (parse.rsn_pmkid == NULL ||
os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
{
wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
"RSNIE");
return -1;
}
os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
sm->pmk_r1_name, WPA_PMK_NAME_LEN);
bssid = target_ap;
if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce,
sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk,
ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0)
return -1;
ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
sm->pmk_r1_name,
sm->ptk.kck, sm->ptk.kck_len, bssid,
ric_ies, ric_ies_len,
parse.mdie ? parse.mdie - 2 : NULL);
if (ft_ies) {
wpa_sm_update_ft_ies(sm, sm->mobility_domain,
ft_ies, ft_ies_len, false);
os_free(ft_ies);
}
wpa_sm_mark_authenticated(sm, bssid);
ret = wpa_ft_install_ptk(sm, bssid);
if (ret) {
/*
* Some drivers do not support key configuration when we are
* not associated with the target AP. Work around this by
* trying again after the following reassociation gets
* completed.
*/
wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
"association - try again after reassociation");
sm->set_ptk_after_assoc = 1;
} else
sm->set_ptk_after_assoc = 0;
sm->ft_completed = 1;
if (ft_action) {
/*
* The caller is expected trigger re-association with the
* Target AP.
*/
os_memcpy(sm->bssid, target_ap, ETH_ALEN);
}
return 0;
}
int wpa_ft_is_completed(struct wpa_sm *sm)
{
if (sm == NULL)
return 0;
if (!wpa_key_mgmt_ft(sm->key_mgmt))
return 0;
return sm->ft_completed;
}
void wpa_reset_ft_completed(struct wpa_sm *sm)
{
if (sm != NULL)
sm->ft_completed = 0;
}
static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
size_t gtk_elem_len)
{
u8 gtk[32];
int keyidx;
enum wpa_alg alg;
size_t gtk_len, keylen, rsc_len;
if (gtk_elem == NULL) {
wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
return 0;
}
wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
gtk_elem, gtk_elem_len);
if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
gtk_elem_len - 19 > sizeof(gtk)) {
wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
"length %lu", (unsigned long) gtk_elem_len);
return -1;
}
gtk_len = gtk_elem_len - 19;
if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, gtk_len / 8, gtk_elem + 11, gtk)) {
wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
"decrypt GTK");
return -1;
}
keylen = wpa_cipher_key_len(sm->group_cipher);
rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
alg = wpa_cipher_to_alg(sm->group_cipher);
if (alg == WIFI_WPA_ALG_NONE) {
wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
sm->group_cipher);
return -1;
}
if (gtk_len < keylen) {
wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
return -1;
}
/* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
if (gtk_elem[2] != keylen) {
wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
"negotiated %lu",
gtk_elem[2], (unsigned long) keylen);
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
if (sm->group_cipher == WPA_CIPHER_TKIP) {
/* Swap Tx/Rx keys for Michael MIC */
u8 tmp[8];
os_memcpy(tmp, gtk + 16, 8);
os_memcpy(gtk + 16, gtk + 24, 8);
os_memcpy(gtk + 24, tmp, 8);
}
if (wpa_sm_set_key(&(sm->install_gtk), alg, sm->bssid, keyidx, 0,
(u8 *)(gtk_elem + 3), rsc_len, gtk, keylen, KEY_FLAG_GROUP | KEY_FLAG_RX) < 0) {
wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
"driver.");
return -1;
}
return 0;
}
#ifdef CONFIG_IEEE80211W
static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
size_t igtk_elem_len)
{
u8 igtk[WPA_IGTK_LEN];
if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
return 0;
if (igtk_elem == NULL) {
wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
return 0;
}
wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
igtk_elem, igtk_elem_len);
if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
"length %lu", (unsigned long) igtk_elem_len);
return -1;
}
if (igtk_elem[8] != WPA_IGTK_LEN) {
wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
"%d", igtk_elem[8]);
return -1;
}
if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, WPA_IGTK_LEN / 8,
igtk_elem + 9, igtk)) {
wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
"decrypt IGTK");
return -1;
}
/* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
WPA_IGTK_LEN);
#ifdef ESP_SUPPLICANT
if (esp_wifi_set_igtk_internal(WIFI_IF_STA, (wifi_wpa_igtk_t *)igtk) < 0) {
#else
keyidx = WPA_GET_LE16(igtk_elem);
if (wpa_sm_set_key(&(sm->install_gtk), WIFI_WPA_ALG_IGTK, sm->bssid, keyidx, 0,
(u8 *)(igtk_elem + 2), 6, igtk, WPA_IGTK_LEN, sm->key_entry_valid) < 0) {
#endif
wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
"driver.");
return -1;
}
return 0;
}
#endif /* CONFIG_IEEE80211W */
int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
size_t ies_len, const u8 *src_addr)
{
struct wpa_ft_ies parse;
struct rsn_mdie *mdie;
struct rsn_ftie *ftie;
unsigned int count;
u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
"enabled for this connection");
return -1;
}
if (sm->ft_reassoc_completed) {
wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
return 0;
}
if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
return -1;
}
mdie = (struct rsn_mdie *) parse.mdie;
if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
os_memcmp(mdie->mobility_domain, sm->mobility_domain,
MOBILITY_DOMAIN_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
return -1;
}
ftie = (struct rsn_ftie *) parse.ftie;
if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
return -1;
}
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_const(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_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
"ReassocResp");
return -1;
}
if (parse.rsn_pmkid == NULL ||
os_memcmp_const(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->ptk.kck_len, sm->own_addr, src_addr, 6,
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 -1;
}
if (os_memcmp_const(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 -1;
}
sm->ft_reassoc_completed = 1;
if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
return -1;
#ifdef CONFIG_IEEE80211W
if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
return -1;
#endif /* CONFIG_IEEE80211W */
if (sm->set_ptk_after_assoc) {
wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
"are associated");
if (wpa_ft_install_ptk(sm, src_addr) < 0)
return -1;
sm->set_ptk_after_assoc = 0;
}
if (parse.ric) {
wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
parse.ric, parse.ric_len);
/* TODO: parse response and inform driver about results when
* using wpa_supplicant SME */
}
wpa_printf(MSG_DEBUG, "FT: Completed successfully");
return 0;
}
/**
* wpa_ft_start_over_ds - Generate over-the-DS auth request
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @target_ap: Target AP Address
* @mdie: Mobility Domain IE from the target AP
* Returns: 0 on success, -1 on failure
*/
int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
const u8 *mdie)
{
u8 *ft_ies;
size_t ft_ies_len;
wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
MAC2STR(target_ap));
/* Generate a new SNonce */
if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
return -1;
}
ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
NULL, 0, target_ap, NULL, 0, mdie);
if (ft_ies) {
sm->over_the_ds_in_progress = 1;
os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
os_free(ft_ies);
}
return 0;
}
#endif /* CONFIG_IEEE80211R */
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