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fragattacks/wpa_supplicant/events.c
Jouni Malinen ad08c3633c Added preliminary Wi-Fi Protected Setup (WPS) implementation 
This adds WPS support for both hostapd and wpa_supplicant. Both programs
can be configured to act as WPS Enrollee and Registrar. Both PBC and PIN
methods are supported.

Currently, hostapd has more complete configuration option for WPS
parameters and wpa_supplicant configuration style will likely change in
the future. External Registrars are not yet supported in hostapd or
wpa_supplicant. While wpa_supplicant has initial support for acting as
an Registrar to configure an AP, this is still using number of hardcoded
parameters which will need to be made configurable for proper operation.
2008-11-23 19:34:26 +02:00

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/*
* WPA Supplicant - Driver event processing
* Copyright (c) 2003-2008, 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 "includes.h"
#include "common.h"
#include "eapol_supp/eapol_supp_sm.h"
#include "wpa.h"
#include "eloop.h"
#include "drivers/driver.h"
#include "config.h"
#include "l2_packet/l2_packet.h"
#include "wpa_supplicant_i.h"
#include "pcsc_funcs.h"
#include "preauth.h"
#include "pmksa_cache.h"
#include "wpa_ctrl.h"
#include "eap_peer/eap.h"
#include "ctrl_iface_dbus.h"
#include "ieee802_11_defs.h"
#include "blacklist.h"
#include "wpas_glue.h"
#include "wps/wps.h"
static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
{
struct wpa_ssid *ssid;
if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid)
return 0;
wpa_printf(MSG_DEBUG, "Select network based on association "
"information");
ssid = wpa_supplicant_get_ssid(wpa_s);
if (ssid == NULL) {
wpa_printf(MSG_INFO, "No network configuration found for the "
"current AP");
return -1;
}
if (ssid->disabled) {
wpa_printf(MSG_DEBUG, "Selected network is disabled");
return -1;
}
wpa_printf(MSG_DEBUG, "Network configuration found for the current "
"AP");
if (ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
WPA_KEY_MGMT_WPA_NONE |
WPA_KEY_MGMT_FT_PSK | WPA_KEY_MGMT_FT_IEEE8021X |
WPA_KEY_MGMT_PSK_SHA256 |
WPA_KEY_MGMT_IEEE8021X_SHA256)) {
u8 wpa_ie[80];
size_t wpa_ie_len = sizeof(wpa_ie);
wpa_supplicant_set_suites(wpa_s, NULL, ssid,
wpa_ie, &wpa_ie_len);
} else {
wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
}
if (wpa_s->current_ssid && wpa_s->current_ssid != ssid)
eapol_sm_invalidate_cached_session(wpa_s->eapol);
wpa_s->current_ssid = ssid;
wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
wpa_supplicant_initiate_eapol(wpa_s);
return 0;
}
static void wpa_supplicant_stop_countermeasures(void *eloop_ctx,
void *sock_ctx)
{
struct wpa_supplicant *wpa_s = eloop_ctx;
if (wpa_s->countermeasures) {
wpa_s->countermeasures = 0;
wpa_drv_set_countermeasures(wpa_s, 0);
wpa_msg(wpa_s, MSG_INFO, "WPA: TKIP countermeasures stopped");
wpa_supplicant_req_scan(wpa_s, 0, 0);
}
}
void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s)
{
wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
os_memset(wpa_s->bssid, 0, ETH_ALEN);
os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt))
eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
wpa_s->ap_ies_from_associnfo = 0;
}
static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s)
{
struct wpa_ie_data ie;
int pmksa_set = -1;
size_t i;
if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 ||
ie.pmkid == NULL)
return;
for (i = 0; i < ie.num_pmkid; i++) {
pmksa_set = pmksa_cache_set_current(wpa_s->wpa,
ie.pmkid + i * PMKID_LEN,
NULL, NULL, 0);
if (pmksa_set == 0) {
eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
break;
}
}
wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA "
"cache", pmksa_set == 0 ? "" : "not ");
}
static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (data == NULL) {
wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event");
return;
}
wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR
" index=%d preauth=%d",
MAC2STR(data->pmkid_candidate.bssid),
data->pmkid_candidate.index,
data->pmkid_candidate.preauth);
pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid,
data->pmkid_candidate.index,
data->pmkid_candidate.preauth);
}
static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s)
{
if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE)
return 0;
#ifdef IEEE8021X_EAPOL
if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA &&
wpa_s->current_ssid &&
!(wpa_s->current_ssid->eapol_flags &
(EAPOL_FLAG_REQUIRE_KEY_UNICAST |
EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) {
/* IEEE 802.1X, but not using dynamic WEP keys (i.e., either
* plaintext or static WEP keys). */
return 0;
}
#endif /* IEEE8021X_EAPOL */
return 1;
}
/**
* wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC
* @wpa_s: pointer to wpa_supplicant data
* @ssid: Configuration data for the network
* Returns: 0 on success, -1 on failure
*
* This function is called when starting authentication with a network that is
* configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA).
*/
int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid)
{
#ifdef IEEE8021X_EAPOL
int aka = 0, sim = 0, type;
if (ssid->eap.pcsc == NULL || wpa_s->scard != NULL)
return 0;
if (ssid->eap.eap_methods == NULL) {
sim = 1;
aka = 1;
} else {
struct eap_method_type *eap = ssid->eap.eap_methods;
while (eap->vendor != EAP_VENDOR_IETF ||
eap->method != EAP_TYPE_NONE) {
if (eap->vendor == EAP_VENDOR_IETF) {
if (eap->method == EAP_TYPE_SIM)
sim = 1;
else if (eap->method == EAP_TYPE_AKA)
aka = 1;
}
eap++;
}
}
if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL)
sim = 0;
if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL)
aka = 0;
if (!sim && !aka) {
wpa_printf(MSG_DEBUG, "Selected network is configured to use "
"SIM, but neither EAP-SIM nor EAP-AKA are enabled");
return 0;
}
wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM "
"(sim=%d aka=%d) - initialize PCSC", sim, aka);
if (sim && aka)
type = SCARD_TRY_BOTH;
else if (aka)
type = SCARD_USIM_ONLY;
else
type = SCARD_GSM_SIM_ONLY;
wpa_s->scard = scard_init(type);
if (wpa_s->scard == NULL) {
wpa_printf(MSG_WARNING, "Failed to initialize SIM "
"(pcsc-lite)");
return -1;
}
wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard);
eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard);
#endif /* IEEE8021X_EAPOL */
return 0;
}
#ifndef CONFIG_NO_SCAN_PROCESSING
static int wpa_supplicant_match_privacy(struct wpa_scan_res *bss,
struct wpa_ssid *ssid)
{
int i, privacy = 0;
if (ssid->mixed_cell)
return 1;
for (i = 0; i < NUM_WEP_KEYS; i++) {
if (ssid->wep_key_len[i]) {
privacy = 1;
break;
}
}
#ifdef IEEE8021X_EAPOL
if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) &&
ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
EAPOL_FLAG_REQUIRE_KEY_BROADCAST))
privacy = 1;
#endif /* IEEE8021X_EAPOL */
if (bss->caps & IEEE80211_CAP_PRIVACY)
return privacy;
return !privacy;
}
static int wpa_supplicant_ssid_bss_match(struct wpa_ssid *ssid,
struct wpa_scan_res *bss)
{
struct wpa_ie_data ie;
int proto_match = 0;
const u8 *rsn_ie, *wpa_ie;
#ifdef CONFIG_WPS
if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
const u8 *wps_ie;
wps_ie = wpa_scan_get_vendor_ie(bss, WPS_IE_VENDOR_TYPE);
if (eap_is_wps_pbc_enrollee(&ssid->eap)) {
if (!wps_ie) {
wpa_printf(MSG_DEBUG, " skip - non-WPS AP");
return 0;
}
if (!wps_is_selected_pbc_registrar(wps_ie + 6,
wps_ie[1] - 4)) {
wpa_printf(MSG_DEBUG, " skip - WPS AP "
"without active PBC Registrar");
return 0;
}
/* TODO: overlap detection */
wpa_printf(MSG_DEBUG, " selected based on WPS IE "
"(Active PBC)");
return 1;
}
if (eap_is_wps_pin_enrollee(&ssid->eap)) {
if (!wps_ie) {
wpa_printf(MSG_DEBUG, " skip - non-WPS AP");
return 0;
}
if (!wps_is_selected_pin_registrar(wps_ie + 6,
wps_ie[1] - 4)) {
wpa_printf(MSG_DEBUG, " skip - WPS AP "
"without active PIN Registrar");
return 0;
}
wpa_printf(MSG_DEBUG, " selected based on WPS IE "
"(Active PIN)");
return 1;
}
if (wps_ie) {
wpa_printf(MSG_DEBUG, " selected based on WPS IE");
return 1;
}
}
#endif /* CONFIG_WPS */
rsn_ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
while ((ssid->proto & WPA_PROTO_RSN) && rsn_ie) {
proto_match++;
if (wpa_parse_wpa_ie(rsn_ie, 2 + rsn_ie[1], &ie)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - parse failed");
break;
}
if (!(ie.proto & ssid->proto)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - proto "
"mismatch");
break;
}
if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - PTK cipher "
"mismatch");
break;
}
if (!(ie.group_cipher & ssid->group_cipher)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - GTK cipher "
"mismatch");
break;
}
if (!(ie.key_mgmt & ssid->key_mgmt)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - key mgmt "
"mismatch");
break;
}
#ifdef CONFIG_IEEE80211W
if (!(ie.capabilities & WPA_CAPABILITY_MFPC) &&
ssid->ieee80211w == IEEE80211W_REQUIRED) {
wpa_printf(MSG_DEBUG, " skip RSN IE - no mgmt frame "
"protection");
break;
}
#endif /* CONFIG_IEEE80211W */
wpa_printf(MSG_DEBUG, " selected based on RSN IE");
return 1;
}
wpa_ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
while ((ssid->proto & WPA_PROTO_WPA) && wpa_ie) {
proto_match++;
if (wpa_parse_wpa_ie(wpa_ie, 2 + wpa_ie[1], &ie)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - parse failed");
break;
}
if (!(ie.proto & ssid->proto)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - proto "
"mismatch");
break;
}
if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - PTK cipher "
"mismatch");
break;
}
if (!(ie.group_cipher & ssid->group_cipher)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - GTK cipher "
"mismatch");
break;
}
if (!(ie.key_mgmt & ssid->key_mgmt)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - key mgmt "
"mismatch");
break;
}
wpa_printf(MSG_DEBUG, " selected based on WPA IE");
return 1;
}
if (proto_match == 0)
wpa_printf(MSG_DEBUG, " skip - no WPA/RSN proto match");
return 0;
}
#ifdef CONFIG_WPS
static int wps_ssid_wildcard_ok(struct wpa_ssid *ssid,
struct wpa_scan_res *bss)
{
const u8 *wps_ie;
if (eap_is_wps_pbc_enrollee(&ssid->eap)) {
wps_ie = wpa_scan_get_vendor_ie(bss, WPS_IE_VENDOR_TYPE);
if (wps_ie &&
wps_is_selected_pbc_registrar(wps_ie + 6, wps_ie[1] - 4)) {
/* allow wildcard SSID for WPS PBC */
return 1;
}
}
if (eap_is_wps_pin_enrollee(&ssid->eap)) {
wps_ie = wpa_scan_get_vendor_ie(bss, WPS_IE_VENDOR_TYPE);
if (wps_ie &&
wps_is_selected_pin_registrar(wps_ie + 6, wps_ie[1] - 4)) {
/* allow wildcard SSID for WPS PIN */
return 1;
}
}
return 0;
}
#endif /* CONFIG_WPS */
static struct wpa_scan_res *
wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
struct wpa_ssid *ssid;
struct wpa_scan_res *bss;
size_t i;
struct wpa_blacklist *e;
const u8 *ie;
wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP");
for (i = 0; i < wpa_s->scan_res->num; i++) {
const u8 *ssid_;
u8 wpa_ie_len, rsn_ie_len, ssid_len;
bss = wpa_s->scan_res->res[i];
ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
ssid_ = ie ? ie + 2 : (u8 *) "";
ssid_len = ie ? ie[1] : 0;
ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
wpa_ie_len = ie ? ie[1] : 0;
ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
rsn_ie_len = ie ? ie[1] : 0;
wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
"wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
(int) i, MAC2STR(bss->bssid),
wpa_ssid_txt(ssid_, ssid_len),
wpa_ie_len, rsn_ie_len, bss->caps);
e = wpa_blacklist_get(wpa_s, bss->bssid);
if (e && e->count > 1) {
wpa_printf(MSG_DEBUG, " skip - blacklisted");
continue;
}
if (wpa_ie_len == 0 && rsn_ie_len == 0) {
wpa_printf(MSG_DEBUG, " skip - no WPA/RSN IE");
continue;
}
for (ssid = group; ssid; ssid = ssid->pnext) {
int check_ssid = 1;
if (ssid->disabled) {
wpa_printf(MSG_DEBUG, " skip - disabled");
continue;
}
#ifdef CONFIG_WPS
if (ssid->ssid_len == 0 &&
wps_ssid_wildcard_ok(ssid, bss))
check_ssid = 0;
#endif /* CONFIG_WPS */
if (check_ssid &&
(ssid_len != ssid->ssid_len ||
os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
wpa_printf(MSG_DEBUG, " skip - "
"SSID mismatch");
continue;
}
if (ssid->bssid_set &&
os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
{
wpa_printf(MSG_DEBUG, " skip - "
"BSSID mismatch");
continue;
}
if (!wpa_supplicant_ssid_bss_match(ssid, bss))
continue;
wpa_printf(MSG_DEBUG, " selected WPA AP "
MACSTR " ssid='%s'",
MAC2STR(bss->bssid),
wpa_ssid_txt(ssid_, ssid_len));
*selected_ssid = ssid;
return bss;
}
}
return NULL;
}
static struct wpa_scan_res *
wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
struct wpa_ssid *ssid;
struct wpa_scan_res *bss;
size_t i;
struct wpa_blacklist *e;
const u8 *ie;
wpa_printf(MSG_DEBUG, "Try to find non-WPA AP");
for (i = 0; i < wpa_s->scan_res->num; i++) {
const u8 *ssid_;
u8 wpa_ie_len, rsn_ie_len, ssid_len;
bss = wpa_s->scan_res->res[i];
ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
ssid_ = ie ? ie + 2 : (u8 *) "";
ssid_len = ie ? ie[1] : 0;
ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
wpa_ie_len = ie ? ie[1] : 0;
ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
rsn_ie_len = ie ? ie[1] : 0;
wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
"wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
(int) i, MAC2STR(bss->bssid),
wpa_ssid_txt(ssid_, ssid_len),
wpa_ie_len, rsn_ie_len, bss->caps);
e = wpa_blacklist_get(wpa_s, bss->bssid);
if (e && e->count > 1) {
wpa_printf(MSG_DEBUG, " skip - blacklisted");
continue;
}
for (ssid = group; ssid; ssid = ssid->pnext) {
int check_ssid = ssid->ssid_len != 0;
if (ssid->disabled) {
wpa_printf(MSG_DEBUG, " skip - disabled");
continue;
}
#ifdef CONFIG_WPS
if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
/* Only allow wildcard SSID match if an AP
* advertises active WPS operation that matches
* with our mode. */
check_ssid = 1;
if (ssid->ssid_len == 0 &&
wps_ssid_wildcard_ok(ssid, bss))
check_ssid = 0;
}
#endif /* CONFIG_WPS */
if (check_ssid &&
(ssid_len != ssid->ssid_len ||
os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
wpa_printf(MSG_DEBUG, " skip - "
"SSID mismatch");
continue;
}
if (ssid->bssid_set &&
os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
{
wpa_printf(MSG_DEBUG, " skip - "
"BSSID mismatch");
continue;
}
if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) &&
!(ssid->key_mgmt & WPA_KEY_MGMT_WPS) &&
!(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA))
{
wpa_printf(MSG_DEBUG, " skip - "
"non-WPA network not allowed");
continue;
}
if ((ssid->key_mgmt &
(WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK |
WPA_KEY_MGMT_IEEE8021X_SHA256 |
WPA_KEY_MGMT_PSK_SHA256)) &&
(wpa_ie_len != 0 || rsn_ie_len != 0)) {
wpa_printf(MSG_DEBUG, " skip - "
"WPA network");
continue;
}
if (!wpa_supplicant_match_privacy(bss, ssid)) {
wpa_printf(MSG_DEBUG, " skip - "
"privacy mismatch");
continue;
}
if (bss->caps & IEEE80211_CAP_IBSS) {
wpa_printf(MSG_DEBUG, " skip - "
"IBSS (adhoc) network");
continue;
}
wpa_printf(MSG_DEBUG, " selected non-WPA AP "
MACSTR " ssid='%s'",
MAC2STR(bss->bssid),
wpa_ssid_txt(ssid_, ssid_len));
*selected_ssid = ssid;
return bss;
}
}
return NULL;
}
static struct wpa_scan_res *
wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
struct wpa_scan_res *selected;
wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d",
group->priority);
/* First, try to find WPA-enabled AP */
selected = wpa_supplicant_select_bss_wpa(wpa_s, group, selected_ssid);
if (selected)
return selected;
/* If no WPA-enabled AP found, try to find non-WPA AP, if configuration
* allows this. */
return wpa_supplicant_select_bss_non_wpa(wpa_s, group, selected_ssid);
}
#ifdef CONFIG_WPS
static int wpa_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
struct wpa_scan_res *selected,
struct wpa_ssid *ssid)
{
const u8 *sel_uuid, *uuid;
size_t i;
const u8 *wps_ie;
if (!eap_is_wps_pbc_enrollee(&ssid->eap))
return 0;
/* Make sure that only one AP is in active PBC mode */
wps_ie = wpa_scan_get_vendor_ie(selected, WPS_IE_VENDOR_TYPE);
if (wps_ie)
sel_uuid = wps_get_uuid_e(wps_ie + 6, wps_ie[1] - 4);
else
sel_uuid = NULL;
if (!sel_uuid) {
wpa_printf(MSG_DEBUG, "WPS: UUID-E not "
"available for PBC overlap "
"detection");
return 1;
}
for (i = 0; i < wpa_s->scan_res->num; i++) {
struct wpa_scan_res *bss = wpa_s->scan_res->res[i];
if (bss == selected)
continue;
wps_ie = wpa_scan_get_vendor_ie(bss, WPS_IE_VENDOR_TYPE);
if (!wps_ie)
continue;
if (!wps_is_selected_pbc_registrar(wps_ie + 6,
wps_ie[1] - 4))
continue;
uuid = wps_get_uuid_e(wps_ie + 6, wps_ie[1] - 4);
if (uuid == NULL) {
wpa_printf(MSG_DEBUG, "WPS: UUID-E not "
"available for PBC overlap "
"detection (other BSS)");
return 1;
}
if (os_memcmp(sel_uuid, uuid, 16) != 0)
return 1; /* PBC overlap */
/* TODO: verify that this is reasonable dual-band situation */
}
return 0;
}
#else /* CONFIG_WPS */
#define wpa_scan_pbc_overlap(w, s, i) 0
#endif /* CONFIG_WPS */
static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s)
{
int prio, timeout;
struct wpa_scan_res *selected = NULL;
struct wpa_ssid *ssid = NULL;
if (wpa_supplicant_get_scan_results(wpa_s) < 0) {
if (wpa_s->conf->ap_scan == 2)
return;
wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
"scanning again");
timeout = 1;
goto req_scan;
}
/*
* Don't post the results if this was the initial cached
* and there were no results.
*/
if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1 &&
wpa_s->scan_res->num == 0) {
wpa_msg(wpa_s, MSG_DEBUG, "Cached scan results are "
"empty - not posting");
} else {
wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
wpa_supplicant_dbus_notify_scan_results(wpa_s);
}
if (wpa_s->conf->ap_scan == 2 || wpa_s->disconnected)
return;
while (selected == NULL) {
for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
selected = wpa_supplicant_select_bss(
wpa_s, wpa_s->conf->pssid[prio], &ssid);
if (selected)
break;
}
if (selected == NULL && wpa_s->blacklist) {
wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
"and try again");
wpa_blacklist_clear(wpa_s);
} else if (selected == NULL) {
break;
}
}
if (selected) {
if (wpa_scan_pbc_overlap(wpa_s, selected, ssid)) {
wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_OVERLAP
"PBC session overlap");
timeout = 10;
goto req_scan;
}
/* Do not trigger new association unless the BSSID has changed
* or if reassociation is requested. If we are in process of
* associating with the selected BSSID, do not trigger new
* attempt. */
if (wpa_s->reassociate ||
(os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 &&
(wpa_s->wpa_state != WPA_ASSOCIATING ||
os_memcmp(selected->bssid, wpa_s->pending_bssid,
ETH_ALEN) != 0))) {
if (wpa_supplicant_scard_init(wpa_s, ssid)) {
wpa_supplicant_req_scan(wpa_s, 10, 0);
return;
}
wpa_supplicant_associate(wpa_s, selected, ssid);
} else {
wpa_printf(MSG_DEBUG, "Already associated with the "
"selected AP.");
}
rsn_preauth_scan_results(wpa_s->wpa, wpa_s->scan_res);
} else {
wpa_printf(MSG_DEBUG, "No suitable AP found.");
timeout = 5;
goto req_scan;
}
return;
req_scan:
if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) {
/*
* Quick recovery if the initial scan results were not
* complete when fetched before the first scan request.
*/
wpa_s->scan_res_tried++;
timeout = 0;
}
wpa_supplicant_req_scan(wpa_s, timeout, 0);
}
#endif /* CONFIG_NO_SCAN_PROCESSING */
static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
int l, len, found = 0, wpa_found, rsn_found;
u8 *p;
wpa_printf(MSG_DEBUG, "Association info event");
if (data->assoc_info.req_ies)
wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies,
data->assoc_info.req_ies_len);
if (data->assoc_info.resp_ies)
wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies,
data->assoc_info.resp_ies_len);
if (data->assoc_info.beacon_ies)
wpa_hexdump(MSG_DEBUG, "beacon_ies",
data->assoc_info.beacon_ies,
data->assoc_info.beacon_ies_len);
p = data->assoc_info.req_ies;
l = data->assoc_info.req_ies_len;
/* Go through the IEs and make a copy of the WPA/RSN IE, if present. */
while (p && l >= 2) {
len = p[1] + 2;
if (len > l) {
wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
p, l);
break;
}
if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
(os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) ||
(p[0] == WLAN_EID_RSN && p[1] >= 2)) {
if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len))
break;
found = 1;
wpa_find_assoc_pmkid(wpa_s);
break;
}
l -= len;
p += len;
}
if (!found && data->assoc_info.req_ies)
wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
/* WPA/RSN IE from Beacon/ProbeResp */
p = data->assoc_info.beacon_ies;
l = data->assoc_info.beacon_ies_len;
/* Go through the IEs and make a copy of the WPA/RSN IEs, if present.
*/
wpa_found = rsn_found = 0;
while (p && l >= 2) {
len = p[1] + 2;
if (len > l) {
wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies",
p, l);
break;
}
if (!wpa_found &&
p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) {
wpa_found = 1;
wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len);
}
if (!rsn_found &&
p[0] == WLAN_EID_RSN && p[1] >= 2) {
rsn_found = 1;
wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len);
}
l -= len;
p += len;
}
if (!wpa_found && data->assoc_info.beacon_ies)
wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0);
if (!rsn_found && data->assoc_info.beacon_ies)
wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0);
if (wpa_found || rsn_found)
wpa_s->ap_ies_from_associnfo = 1;
}
static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
u8 bssid[ETH_ALEN];
int ft_completed = wpa_ft_is_completed(wpa_s->wpa);
if (data)
wpa_supplicant_event_associnfo(wpa_s, data);
wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED);
if (wpa_s->use_client_mlme)
os_memcpy(bssid, wpa_s->bssid, ETH_ALEN);
if (wpa_s->use_client_mlme ||
(wpa_drv_get_bssid(wpa_s, bssid) >= 0 &&
os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) {
wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID="
MACSTR, MAC2STR(bssid));
os_memcpy(wpa_s->bssid, bssid, ETH_ALEN);
os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) {
wpa_clear_keys(wpa_s, bssid);
}
if (wpa_supplicant_select_config(wpa_s) < 0) {
wpa_supplicant_disassociate(
wpa_s, WLAN_REASON_DEAUTH_LEAVING);
return;
}
}
wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid));
if (wpa_s->current_ssid) {
/* When using scanning (ap_scan=1), SIM PC/SC interface can be
* initialized before association, but for other modes,
* initialize PC/SC here, if the current configuration needs
* smartcard or SIM/USIM. */
wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid);
}
wpa_sm_notify_assoc(wpa_s->wpa, bssid);
l2_packet_notify_auth_start(wpa_s->l2);
/*
* Set portEnabled first to FALSE in order to get EAP state machine out
* of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE
* state machine may transit to AUTHENTICATING state based on obsolete
* eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to
* AUTHENTICATED without ever giving chance to EAP state machine to
* reset the state.
*/
if (!ft_completed) {
eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
}
if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed)
eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
/* 802.1X::portControl = Auto */
eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE);
wpa_s->eapol_received = 0;
if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
wpa_supplicant_cancel_auth_timeout(wpa_s);
wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
} else if (!ft_completed) {
/* Timeout for receiving the first EAPOL packet */
wpa_supplicant_req_auth_timeout(wpa_s, 10, 0);
}
wpa_supplicant_cancel_scan(wpa_s);
if (wpa_s->driver_4way_handshake &&
wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
/*
* We are done; the driver will take care of RSN 4-way
* handshake.
*/
wpa_supplicant_cancel_auth_timeout(wpa_s);
wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
eapol_sm_notify_portValid(wpa_s->eapol, TRUE);
eapol_sm_notify_eap_success(wpa_s->eapol, TRUE);
}
}
static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s)
{
const u8 *bssid;
if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
/*
* At least Host AP driver and a Prism3 card seemed to be
* generating streams of disconnected events when configuring
* IBSS for WPA-None. Ignore them for now.
*/
wpa_printf(MSG_DEBUG, "Disconnect event - ignore in "
"IBSS/WPA-None mode");
return;
}
if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE &&
wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - "
"pre-shared key may be incorrect");
}
if (wpa_s->wpa_state >= WPA_ASSOCIATED)
wpa_supplicant_req_scan(wpa_s, 0, 100000);
bssid = wpa_s->bssid;
if (is_zero_ether_addr(bssid))
bssid = wpa_s->pending_bssid;
wpa_blacklist_add(wpa_s, bssid);
wpa_sm_notify_disassoc(wpa_s->wpa);
wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "- Disconnect event - "
"remove keys");
if (wpa_supplicant_dynamic_keys(wpa_s)) {
wpa_s->keys_cleared = 0;
wpa_clear_keys(wpa_s, wpa_s->bssid);
}
wpa_supplicant_mark_disassoc(wpa_s);
}
#ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
static void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx,
void *sock_ctx)
{
struct wpa_supplicant *wpa_s = eloop_ctx;
if (!wpa_s->pending_mic_error_report)
return;
wpa_printf(MSG_DEBUG, "WPA: Sending pending MIC error report");
wpa_sm_key_request(wpa_s->wpa, 1, wpa_s->pending_mic_error_pairwise);
wpa_s->pending_mic_error_report = 0;
}
#endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
static void
wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
int pairwise;
struct os_time t;
wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected");
pairwise = (data && data->michael_mic_failure.unicast);
os_get_time(&t);
if ((wpa_s->last_michael_mic_error &&
t.sec - wpa_s->last_michael_mic_error <= 60) ||
wpa_s->pending_mic_error_report) {
if (wpa_s->pending_mic_error_report) {
/*
* Send the pending MIC error report immediately since
* we are going to start countermeasures and AP better
* do the same.
*/
wpa_sm_key_request(wpa_s->wpa, 1,
wpa_s->pending_mic_error_pairwise);
}
/* Send the new MIC error report immediately since we are going
* to start countermeasures and AP better do the same.
*/
wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
/* initialize countermeasures */
wpa_s->countermeasures = 1;
wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started");
/*
* Need to wait for completion of request frame. We do not get
* any callback for the message completion, so just wait a
* short while and hope for the best. */
os_sleep(0, 10000);
wpa_drv_set_countermeasures(wpa_s, 1);
wpa_supplicant_deauthenticate(wpa_s,
WLAN_REASON_MICHAEL_MIC_FAILURE);
eloop_cancel_timeout(wpa_supplicant_stop_countermeasures,
wpa_s, NULL);
eloop_register_timeout(60, 0,
wpa_supplicant_stop_countermeasures,
wpa_s, NULL);
/* TODO: mark the AP rejected for 60 second. STA is
* allowed to associate with another AP.. */
} else {
#ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
if (wpa_s->mic_errors_seen) {
/*
* Reduce the effectiveness of Michael MIC error
* reports as a means for attacking against TKIP if
* more than one MIC failure is noticed with the same
* PTK. We delay the transmission of the reports by a
* random time between 0 and 60 seconds in order to
* force the attacker wait 60 seconds before getting
* the information on whether a frame resulted in a MIC
* failure.
*/
u8 rval[4];
int sec;
if (os_get_random(rval, sizeof(rval)) < 0)
sec = os_random() % 60;
else
sec = WPA_GET_BE32(rval) % 60;
wpa_printf(MSG_DEBUG, "WPA: Delay MIC error report %d "
"seconds", sec);
wpa_s->pending_mic_error_report = 1;
wpa_s->pending_mic_error_pairwise = pairwise;
eloop_cancel_timeout(
wpa_supplicant_delayed_mic_error_report,
wpa_s, NULL);
eloop_register_timeout(
sec, os_random() % 1000000,
wpa_supplicant_delayed_mic_error_report,
wpa_s, NULL);
} else {
wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
}
#else /* CONFIG_DELAYED_MIC_ERROR_REPORT */
wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
#endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
}
wpa_s->last_michael_mic_error = t.sec;
wpa_s->mic_errors_seen++;
}
static void
wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0)
return;
switch (data->interface_status.ievent) {
case EVENT_INTERFACE_ADDED:
if (!wpa_s->interface_removed)
break;
wpa_s->interface_removed = 0;
wpa_printf(MSG_DEBUG, "Configured interface was added.");
if (wpa_supplicant_driver_init(wpa_s) < 0) {
wpa_printf(MSG_INFO, "Failed to initialize the driver "
"after interface was added.");
}
break;
case EVENT_INTERFACE_REMOVED:
wpa_printf(MSG_DEBUG, "Configured interface was removed.");
wpa_s->interface_removed = 1;
wpa_supplicant_mark_disassoc(wpa_s);
l2_packet_deinit(wpa_s->l2);
wpa_s->l2 = NULL;
break;
}
}
#ifdef CONFIG_PEERKEY
static void
wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (data == NULL)
return;
wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer);
}
#endif /* CONFIG_PEERKEY */
#ifdef CONFIG_IEEE80211R
static void
wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (data == NULL)
return;
if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies,
data->ft_ies.ies_len,
data->ft_ies.ft_action,
data->ft_ies.target_ap) < 0) {
/* TODO: prevent MLME/driver from trying to associate? */
}
}
#endif /* CONFIG_IEEE80211R */
void wpa_supplicant_event(void *ctx, wpa_event_type event,
union wpa_event_data *data)
{
struct wpa_supplicant *wpa_s = ctx;
switch (event) {
case EVENT_ASSOC:
wpa_supplicant_event_assoc(wpa_s, data);
break;
case EVENT_DISASSOC:
wpa_supplicant_event_disassoc(wpa_s);
break;
case EVENT_MICHAEL_MIC_FAILURE:
wpa_supplicant_event_michael_mic_failure(wpa_s, data);
break;
#ifndef CONFIG_NO_SCAN_PROCESSING
case EVENT_SCAN_RESULTS:
wpa_supplicant_event_scan_results(wpa_s);
break;
#endif /* CONFIG_NO_SCAN_PROCESSING */
case EVENT_ASSOCINFO:
wpa_supplicant_event_associnfo(wpa_s, data);
break;
case EVENT_INTERFACE_STATUS:
wpa_supplicant_event_interface_status(wpa_s, data);
break;
case EVENT_PMKID_CANDIDATE:
wpa_supplicant_event_pmkid_candidate(wpa_s, data);
break;
#ifdef CONFIG_PEERKEY
case EVENT_STKSTART:
wpa_supplicant_event_stkstart(wpa_s, data);
break;
#endif /* CONFIG_PEERKEY */
#ifdef CONFIG_IEEE80211R
case EVENT_FT_RESPONSE:
wpa_supplicant_event_ft_response(wpa_s, data);
break;
#endif /* CONFIG_IEEE80211R */
default:
wpa_printf(MSG_INFO, "Unknown event %d", event);
break;
}
}
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