/*
* wpa_supplicant - IBSS RSN
* Copyright (c) 2009-2013, 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 "common/wpa_ctrl.h"
#include "utils/eloop.h"
#include "l2_packet/l2_packet.h"
#include "rsn_supp/wpa.h"
#include "rsn_supp/wpa_ie.h"
#include "ap/wpa_auth.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "common/ieee802_11_defs.h"
#include "ibss_rsn.h"
static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx);
static struct ibss_rsn_peer * ibss_rsn_get_peer(struct ibss_rsn *ibss_rsn,
const u8 *addr)
{
struct ibss_rsn_peer *peer;
for (peer = ibss_rsn->peers; peer; peer = peer->next)
if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0)
break;
return peer;
}
static void ibss_rsn_free(struct ibss_rsn_peer *peer)
{
eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
wpa_auth_sta_deinit(peer->auth);
wpa_sm_deinit(peer->supp);
os_free(peer);
}
static void supp_set_state(void *ctx, enum wpa_states state)
{
struct ibss_rsn_peer *peer = ctx;
peer->supp_state = state;
}
static enum wpa_states supp_get_state(void *ctx)
{
struct ibss_rsn_peer *peer = ctx;
return peer->supp_state;
}
static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
size_t len)
{
struct ibss_rsn_peer *peer = ctx;
struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x "
"len=%lu)",
__func__, MAC2STR(dest), proto, (unsigned long) len);
if (wpa_s->l2)
return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
return -1;
}
static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
u16 data_len, size_t *msg_len, void **data_pos)
{
struct ieee802_1x_hdr *hdr;
wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
__func__, type, data_len);
*msg_len = sizeof(*hdr) + data_len;
hdr = os_malloc(*msg_len);
if (hdr == NULL)
return NULL;
hdr->version = 2;
hdr->type = type;
hdr->length = host_to_be16(data_len);
if (data)
os_memcpy(hdr + 1, data, data_len);
else
os_memset(hdr + 1, 0, data_len);
if (data_pos)
*data_pos = hdr + 1;
return (u8 *) hdr;
}
static int supp_get_beacon_ie(void *ctx)
{
struct ibss_rsn_peer *peer = ctx;
wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
/* TODO: get correct RSN IE */
return wpa_sm_set_ap_rsn_ie(peer->supp,
(u8 *) "\x30\x14\x01\x00"
"\x00\x0f\xac\x04"
"\x01\x00\x00\x0f\xac\x04"
"\x01\x00\x00\x0f\xac\x02"
"\x00\x00", 22);
}
static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
{
struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
if ((peer->authentication_status &
(IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) !=
(IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH))
return;
if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
return;
peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
MAC2STR(peer->addr));
}
static int supp_set_key(void *ctx, enum wpa_alg alg,
const u8 *addr, int key_idx, int set_tx,
const u8 *seq, size_t seq_len,
const u8 *key, size_t key_len)
{
struct ibss_rsn_peer *peer = ctx;
wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
"set_tx=%d)",
__func__, alg, MAC2STR(addr), key_idx, set_tx);
wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
if (key_idx == 0) {
peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
ibss_check_rsn_completed(peer);
/*
* In IBSS RSN, the pairwise key from the 4-way handshake
* initiated by the peer with highest MAC address is used.
*/
if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
ETH_ALEN) > 0) {
wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
return 0;
}
}
if (is_broadcast_ether_addr(addr))
addr = peer->addr;
return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx,
set_tx, seq, seq_len, key, key_len);
}
static void * supp_get_network_ctx(void *ctx)
{
struct ibss_rsn_peer *peer = ctx;
return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
}
static int supp_mlme_setprotection(void *ctx, const u8 *addr,
int protection_type, int key_type)
{
wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
"key_type=%d)",
__func__, MAC2STR(addr), protection_type, key_type);
return 0;
}
static void supp_cancel_auth_timeout(void *ctx)
{
wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
}
static void supp_deauthenticate(void * ctx, int reason_code)
{
wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
}
static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
const u8 *psk)
{
struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
if (ctx == NULL)
return -1;
ctx->ctx = peer;
ctx->msg_ctx = peer->ibss_rsn->wpa_s;
ctx->set_state = supp_set_state;
ctx->get_state = supp_get_state;
ctx->ether_send = supp_ether_send;
ctx->get_beacon_ie = supp_get_beacon_ie;
ctx->alloc_eapol = supp_alloc_eapol;
ctx->set_key = supp_set_key;
ctx->get_network_ctx = supp_get_network_ctx;
ctx->mlme_setprotection = supp_mlme_setprotection;
ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
ctx->deauthenticate = supp_deauthenticate;
peer->supp = wpa_sm_init(ctx);
if (peer->supp == NULL) {
wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
return -1;
}
wpa_sm_set_own_addr(peer->supp, own_addr);
wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL, NULL);
peer->supp_ie_len = sizeof(peer->supp_ie);
if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
&peer->supp_ie_len) < 0) {
wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
" failed");
return -1;
}
wpa_sm_notify_assoc(peer->supp, peer->addr);
return 0;
}
static void auth_logger(void *ctx, const u8 *addr, logger_level level,
const char *txt)
{
if (addr)
wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
MAC2STR(addr), txt);
else
wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
}
static const u8 * auth_get_psk(void *ctx, const u8 *addr,
const u8 *p2p_dev_addr, const u8 *prev_psk)
{
struct ibss_rsn *ibss_rsn = ctx;
wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
__func__, MAC2STR(addr), prev_psk);
if (prev_psk)
return NULL;
return ibss_rsn->psk;
}
static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
size_t data_len, int encrypt)
{
struct ibss_rsn *ibss_rsn = ctx;
struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
"encrypt=%d)",
__func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
if (wpa_s->l2)
return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
data_len);
return -1;
}
static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
const u8 *addr, int idx, u8 *key, size_t key_len)
{
struct ibss_rsn *ibss_rsn = ctx;
u8 seq[6];
os_memset(seq, 0, sizeof(seq));
if (addr) {
wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
" key_idx=%d)",
__func__, alg, MAC2STR(addr), idx);
} else {
wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
__func__, alg, idx);
}
wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
if (idx == 0) {
if (addr) {
struct ibss_rsn_peer *peer;
peer = ibss_rsn_get_peer(ibss_rsn, addr);
if (peer) {
peer->authentication_status |=
IBSS_RSN_SET_PTK_AUTH;
ibss_check_rsn_completed(peer);
}
}
/*
* In IBSS RSN, the pairwise key from the 4-way handshake
* initiated by the peer with highest MAC address is used.
*/
if (addr == NULL ||
os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
return 0;
}
}
return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
1, seq, 6, key, key_len);
}
static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
{
struct ibss_rsn *ibss_rsn = ctx;
wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
}
static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
void *ctx),
void *cb_ctx)
{
struct ibss_rsn *ibss_rsn = ctx;
struct ibss_rsn_peer *peer;
wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
for (peer = ibss_rsn->peers; peer; peer = peer->next) {
if (peer->auth && cb(peer->auth, cb_ctx))
return 1;
}
return 0;
}
static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
struct ibss_rsn_peer *peer, int authorized)
{
int res;
if (authorized) {
res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
WPA_STA_AUTHORIZED,
WPA_STA_AUTHORIZED, ~0);
wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
MAC2STR(peer->addr));
} else {
res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
0, 0, ~WPA_STA_AUTHORIZED);
wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
MAC2STR(peer->addr));
}
if (res && errno != ENOENT) {
wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
"for kernel driver (errno=%d)",
MAC2STR(peer->addr), errno);
}
}
static void auth_set_eapol(void *ctx, const u8 *addr,
wpa_eapol_variable var, int value)
{
struct ibss_rsn *ibss_rsn = ctx;
struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
if (peer == NULL)
return;
switch (var) {
case WPA_EAPOL_authorized:
ibss_set_sta_authorized(ibss_rsn, peer, value);
break;
default:
/* do not handle any other event */
wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
break;
}
}
static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
const u8 *own_addr)
{
struct wpa_auth_config conf;
struct wpa_auth_callbacks cb;
wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
os_memset(&conf, 0, sizeof(conf));
conf.wpa = 2;
conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
conf.wpa_pairwise = WPA_CIPHER_CCMP;
conf.rsn_pairwise = WPA_CIPHER_CCMP;
conf.wpa_group = WPA_CIPHER_CCMP;
conf.eapol_version = 2;
conf.wpa_group_rekey = 600;
os_memset(&cb, 0, sizeof(cb));
cb.ctx = ibss_rsn;
cb.logger = auth_logger;
cb.set_eapol = auth_set_eapol;
cb.send_eapol = auth_send_eapol;
cb.get_psk = auth_get_psk;
cb.set_key = auth_set_key;
cb.for_each_sta = auth_for_each_sta;
cb.disconnect = ibss_rsn_disconnect;
ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
if (ibss_rsn->auth_group == NULL) {
wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
return -1;
}
wpa_init_keys(ibss_rsn->auth_group);
return 0;
}
static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
struct ibss_rsn_peer *peer)
{
peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
if (peer->auth == NULL) {
wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
return -1;
}
/* TODO: get peer RSN IE with Probe Request */
if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
(u8 *) "\x30\x14\x01\x00"
"\x00\x0f\xac\x04"
"\x01\x00\x00\x0f\xac\x04"
"\x01\x00\x00\x0f\xac\x02"
"\x00\x00", 22, NULL, 0) !=
WPA_IE_OK) {
wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
return -1;
}
if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
return -1;
if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
return -1;
return 0;
}
static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
{
struct ieee80211_mgmt auth;
const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
if (wpa_s->driver->send_frame == NULL)
return -1;
os_memset(&auth, 0, sizeof(auth));
auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
WLAN_FC_STYPE_AUTH);
os_memcpy(auth.da, da, ETH_ALEN);
os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
auth.u.auth.auth_transaction = host_to_le16(seq);
auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
seq, MAC2STR(da));
return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
auth_length, 0);
}
static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
{
return peer->authentication_status &
(IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
}
static struct ibss_rsn_peer *
ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
{
struct ibss_rsn_peer *peer;
if (ibss_rsn == NULL)
return NULL;
peer = ibss_rsn_get_peer(ibss_rsn, addr);
if (peer) {
wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
" already running", MAC2STR(addr));
return peer;
}
wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
MAC2STR(addr));
peer = os_zalloc(sizeof(*peer));
if (peer == NULL) {
wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
return NULL;
}
peer->ibss_rsn = ibss_rsn;
os_memcpy(peer->addr, addr, ETH_ALEN);
peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
ibss_rsn->psk) < 0) {
ibss_rsn_free(peer);
return NULL;
}
peer->next = ibss_rsn->peers;
ibss_rsn->peers = peer;
return peer;
}
static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
{
struct ibss_rsn_peer *peer = eloop_ctx;
/*
* Assume peer does not support Authentication exchange or the frame was
* lost somewhere - start EAPOL Authenticator.
*/
wpa_printf(MSG_DEBUG,
"RSN: Timeout on waiting Authentication frame response from "
MACSTR " - start authenticator", MAC2STR(peer->addr));
peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
ibss_rsn_auth_init(peer->ibss_rsn, peer);
}
int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
{
struct ibss_rsn_peer *peer;
int res;
if (!ibss_rsn)
return -1;
/* if the peer already exists, exit immediately */
peer = ibss_rsn_get_peer(ibss_rsn, addr);
if (peer)
return 0;
peer = ibss_rsn_peer_init(ibss_rsn, addr);
if (peer == NULL)
return -1;
/* Open Authentication: send first Authentication frame */
res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
if (res) {
/*
* The driver may not support Authentication frame exchange in
* IBSS. Ignore authentication and go through EAPOL exchange.
*/
peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
return ibss_rsn_auth_init(ibss_rsn, peer);
} else {
os_get_reltime(&peer->own_auth_tx);
eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
}
return 0;
}
static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
struct ibss_rsn_peer *peer, int reason)
{
int already_started;
if (ibss_rsn == NULL || peer == NULL)
return -1;
already_started = ibss_rsn_is_auth_started(peer);
peer->authentication_status |= reason;
if (already_started) {
wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
"started for peer " MACSTR, MAC2STR(peer->addr));
return 0;
}
wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
"for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
return ibss_rsn_auth_init(ibss_rsn, peer);
}
void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
{
struct ibss_rsn_peer *peer, *prev;
if (ibss_rsn == NULL)
return;
if (peermac == NULL) {
/* remove all peers */
wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
peer = ibss_rsn->peers;
while (peer) {
prev = peer;
peer = peer->next;
ibss_rsn_free(prev);
ibss_rsn->peers = peer;
}
} else {
/* remove specific peer */
wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
__func__, MAC2STR(peermac));
for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
prev = peer, peer = peer->next) {
if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
if (prev == NULL)
ibss_rsn->peers = peer->next;
else
prev->next = peer->next;
ibss_rsn_free(peer);
wpa_printf(MSG_DEBUG, "%s: Successfully "
"removed a specific peer",
__func__);
break;
}
}
}
}
struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s)
{
struct ibss_rsn *ibss_rsn;
ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
if (ibss_rsn == NULL)
return NULL;
ibss_rsn->wpa_s = wpa_s;
if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) {
ibss_rsn_deinit(ibss_rsn);
return NULL;
}
return ibss_rsn;
}
void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
{
struct ibss_rsn_peer *peer, *prev;
if (ibss_rsn == NULL)
return;
peer = ibss_rsn->peers;
while (peer) {
prev = peer;
peer = peer->next;
ibss_rsn_free(prev);
}
if (ibss_rsn->auth_group)
wpa_deinit(ibss_rsn->auth_group);
os_free(ibss_rsn);
}
static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
{
const struct ieee802_1x_hdr *hdr;
const struct wpa_eapol_key *key;
u16 key_info;
size_t plen;
/* TODO: Support other EAPOL packets than just EAPOL-Key */
if (len < sizeof(*hdr) + sizeof(*key))
return -1;
hdr = (const struct ieee802_1x_hdr *) buf;
key = (const struct wpa_eapol_key *) (hdr + 1);
plen = be_to_host16(hdr->length);
if (hdr->version < EAPOL_VERSION) {
/* TODO: backwards compatibility */
}
if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
"not a Key frame", hdr->type);
return -1;
}
if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
"invalid (frame size %lu)",
(unsigned long) plen, (unsigned long) len);
return -1;
}
if (key->type != EAPOL_KEY_TYPE_RSN) {
wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
"discarded", key->type);
return -1;
}
key_info = WPA_GET_BE16(key->key_info);
return !!(key_info & WPA_KEY_INFO_ACK);
}
static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
struct ibss_rsn_peer *peer,
const u8 *buf, size_t len)
{
int supp;
u8 *tmp;
supp = ibss_rsn_eapol_dst_supp(buf, len);
if (supp < 0)
return -1;
tmp = os_malloc(len);
if (tmp == NULL)
return -1;
os_memcpy(tmp, buf, len);
if (supp) {
peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
MACSTR, MAC2STR(peer->addr));
wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
} else {
if (ibss_rsn_is_auth_started(peer) == 0) {
wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
"Authenticator dropped as " MACSTR " is not "
"authenticated", MAC2STR(peer->addr));
os_free(tmp);
return -1;
}
wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
"from "MACSTR, MAC2STR(peer->addr));
wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
}
os_free(tmp);
return 1;
}
int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
const u8 *buf, size_t len)
{
struct ibss_rsn_peer *peer;
if (ibss_rsn == NULL)
return -1;
peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
if (peer)
return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
/*
* Create new IBSS peer based on an EAPOL message from the peer
* Authenticator.
*/
peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
if (peer == NULL)
return -1;
/* assume the peer is authenticated already */
wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
MACSTR, MAC2STR(src_addr));
ibss_rsn_peer_authenticated(ibss_rsn, peer,
IBSS_RSN_AUTH_EAPOL_BY_US);
return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
buf, len);
}
return 0;
}
void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
{
if (ibss_rsn == NULL)
return;
os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
}
static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
struct ibss_rsn_peer *peer,
const u8* addr)
{
wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
MAC2STR(addr));
if (peer &&
peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
if (peer->own_auth_tx.sec) {
struct os_reltime now, diff;
os_get_reltime(&now);
os_reltime_sub(&now, &peer->own_auth_tx, &diff);
if (diff.sec == 0 && diff.usec < 500000) {
wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
(int) diff.usec);
goto skip_reinit;
}
}
/*
* A peer sent us an Authentication frame even though it already
* started an EAPOL session. We should reinit state machines
* here, but it's much more complicated than just deleting and
* recreating the state machine
*/
wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
MACSTR, MAC2STR(addr));
ibss_rsn_stop(ibss_rsn, addr);
peer = NULL;
}
if (!peer) {
peer = ibss_rsn_peer_init(ibss_rsn, addr);
if (!peer)
return;
wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
MAC2STR(addr));
}
skip_reinit:
/* reply with an Authentication frame now, before sending an EAPOL */
ibss_rsn_send_auth(ibss_rsn, addr, 2);
/* no need to start another AUTH challenge in the other way.. */
ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
}
void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
size_t len)
{
const struct ieee80211_mgmt *header;
struct ibss_rsn_peer *peer;
size_t auth_length;
header = (const struct ieee80211_mgmt *) auth_frame;
auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
if (ibss_rsn == NULL || len < auth_length)
return;
if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
return;
peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
switch (le_to_host16(header->u.auth.auth_transaction)) {
case 1:
ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
break;
case 2:
wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
MACSTR, MAC2STR(header->sa));
if (!peer) {
wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
"unknown STA " MACSTR, MAC2STR(header->sa));
break;
}
/* authentication has been completed */
eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
MAC2STR(header->sa));
ibss_rsn_peer_authenticated(ibss_rsn, peer,
IBSS_RSN_AUTH_BY_US);
break;
}
}