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fragattacks/wpa_supplicant/events.c
Jouni Malinen 24c23d1b3c WPS: Added support for wildcard SSID matching in ap_scan=2 mode 
Change association behavior to match with ap_scan=1 when WPS is used in
ap_scan=2 mode with wildcard SSID matching. In addition, allow hardcoded
BSSID to be used to select AP even if selected registrar attribute is
not present.
2008-12-20 22:55:02 +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_supplicant.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;
int ret;
ret = wpas_wps_ssid_bss_match(ssid, bss);
if (ret >= 0)
return ret;
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;
}
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 &&
wpas_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 &&
wpas_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);
}
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);
wpas_wps_notify_scan_results(wpa_s);
}
if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s)) ||
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 (wpas_wps_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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