mirror of
https://github.com/vanhoefm/fragattacks.git
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d1f9c410c1
Most of this file was already moved into wpa_supplicant/scan.c and we can remove the file completely by having couple of small helper functions copied to the remaining users outside core wpa_supplicant code.
646 lines
15 KiB
C
646 lines
15 KiB
C
/*
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* WPA Supplicant - Scanning
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* Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "utils/eloop.h"
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#include "common/ieee802_11_defs.h"
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#include "config.h"
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#include "wpa_supplicant_i.h"
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#include "driver_i.h"
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#include "mlme.h"
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#include "wps_supplicant.h"
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#include "notify.h"
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#include "bss.h"
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#include "scan.h"
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static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
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{
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struct wpa_ssid *ssid;
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union wpa_event_data data;
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ssid = wpa_supplicant_get_ssid(wpa_s);
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if (ssid == NULL)
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return;
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if (wpa_s->current_ssid == NULL) {
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wpa_s->current_ssid = ssid;
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if (wpa_s->current_ssid != NULL)
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wpas_notify_network_changed(wpa_s);
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}
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wpa_supplicant_initiate_eapol(wpa_s);
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wpa_printf(MSG_DEBUG, "Already associated with a configured network - "
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"generating associated event");
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os_memset(&data, 0, sizeof(data));
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wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
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}
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#ifdef CONFIG_WPS
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static int wpas_wps_in_use(struct wpa_config *conf,
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enum wps_request_type *req_type)
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{
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struct wpa_ssid *ssid;
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int wps = 0;
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for (ssid = conf->ssid; ssid; ssid = ssid->next) {
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if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
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continue;
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wps = 1;
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*req_type = wpas_wps_get_req_type(ssid);
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if (!ssid->eap.phase1)
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continue;
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if (os_strstr(ssid->eap.phase1, "pbc=1"))
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return 2;
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}
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return wps;
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}
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#endif /* CONFIG_WPS */
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int wpa_supplicant_enabled_networks(struct wpa_config *conf)
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{
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struct wpa_ssid *ssid = conf->ssid;
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while (ssid) {
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if (!ssid->disabled)
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return 1;
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ssid = ssid->next;
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}
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return 0;
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}
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static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
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struct wpa_ssid *ssid)
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{
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while (ssid) {
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if (!ssid->disabled)
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break;
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ssid = ssid->next;
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}
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/* ap_scan=2 mode - try to associate with each SSID. */
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if (ssid == NULL) {
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wpa_printf(MSG_DEBUG, "wpa_supplicant_scan: Reached "
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"end of scan list - go back to beginning");
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wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
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wpa_supplicant_req_scan(wpa_s, 0, 0);
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return;
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}
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if (ssid->next) {
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/* Continue from the next SSID on the next attempt. */
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wpa_s->prev_scan_ssid = ssid;
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} else {
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/* Start from the beginning of the SSID list. */
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wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
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}
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wpa_supplicant_associate(wpa_s, NULL, ssid);
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}
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static int int_array_len(const int *a)
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{
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int i;
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for (i = 0; a && a[i]; i++)
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;
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return i;
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}
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static void int_array_concat(int **res, const int *a)
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{
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int reslen, alen, i;
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int *n;
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reslen = int_array_len(*res);
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alen = int_array_len(a);
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n = os_realloc(*res, (reslen + alen + 1) * sizeof(int));
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if (n == NULL) {
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os_free(*res);
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*res = NULL;
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return;
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}
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for (i = 0; i <= alen; i++)
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n[reslen + i] = a[i];
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*res = n;
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}
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static int freq_cmp(const void *a, const void *b)
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{
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int _a = *(int *) a;
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int _b = *(int *) b;
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if (_a == 0)
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return 1;
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if (_b == 0)
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return -1;
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return _a - _b;
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}
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static void int_array_sort_unique(int *a)
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{
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int alen;
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int i, j;
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if (a == NULL)
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return;
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alen = int_array_len(a);
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qsort(a, alen, sizeof(int), freq_cmp);
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i = 0;
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j = 1;
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while (a[i] && a[j]) {
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if (a[i] == a[j]) {
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j++;
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continue;
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}
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a[++i] = a[j++];
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}
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if (a[i])
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i++;
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a[i] = 0;
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}
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int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
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struct wpa_driver_scan_params *params)
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{
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int ret;
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wpa_supplicant_notify_scanning(wpa_s, 1);
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if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
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ret = ieee80211_sta_req_scan(wpa_s, params);
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else
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ret = wpa_drv_scan(wpa_s, params);
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if (ret) {
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wpa_supplicant_notify_scanning(wpa_s, 0);
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wpas_notify_scan_done(wpa_s, 0);
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} else
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wpa_s->scan_runs++;
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return ret;
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}
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static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
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{
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struct wpa_supplicant *wpa_s = eloop_ctx;
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struct wpa_ssid *ssid;
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int scan_req = 0, ret;
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struct wpabuf *wps_ie = NULL;
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int wps = 0;
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#ifdef CONFIG_WPS
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enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
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#endif /* CONFIG_WPS */
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struct wpa_driver_scan_params params;
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size_t max_ssids;
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if (wpa_s->disconnected && !wpa_s->scan_req) {
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wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
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return;
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}
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if (!wpa_supplicant_enabled_networks(wpa_s->conf) &&
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!wpa_s->scan_req) {
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wpa_printf(MSG_DEBUG, "No enabled networks - do not scan");
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wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
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return;
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}
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if (wpa_s->conf->ap_scan != 0 &&
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(wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
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wpa_printf(MSG_DEBUG, "Using wired authentication - "
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"overriding ap_scan configuration");
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wpa_s->conf->ap_scan = 0;
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wpas_notify_ap_scan_changed(wpa_s);
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}
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if (wpa_s->conf->ap_scan == 0) {
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wpa_supplicant_gen_assoc_event(wpa_s);
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return;
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}
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if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) ||
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wpa_s->conf->ap_scan == 2)
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max_ssids = 1;
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else {
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max_ssids = wpa_s->max_scan_ssids;
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if (max_ssids > WPAS_MAX_SCAN_SSIDS)
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max_ssids = WPAS_MAX_SCAN_SSIDS;
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}
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#ifdef CONFIG_WPS
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wps = wpas_wps_in_use(wpa_s->conf, &req_type);
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#endif /* CONFIG_WPS */
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if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
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!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) &&
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wps != 2) {
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wpa_s->scan_res_tried++;
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wpa_printf(MSG_DEBUG, "Trying to get current scan results "
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"first without requesting a new scan to speed up "
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"initial association");
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wpa_supplicant_event(wpa_s, EVENT_SCAN_RESULTS, NULL);
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return;
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}
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scan_req = wpa_s->scan_req;
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wpa_s->scan_req = 0;
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os_memset(¶ms, 0, sizeof(params));
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if (wpa_s->wpa_state == WPA_DISCONNECTED ||
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wpa_s->wpa_state == WPA_INACTIVE)
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wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
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/* Find the starting point from which to continue scanning */
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ssid = wpa_s->conf->ssid;
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if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
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while (ssid) {
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if (ssid == wpa_s->prev_scan_ssid) {
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ssid = ssid->next;
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break;
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}
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ssid = ssid->next;
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}
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}
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if (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
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wpa_supplicant_assoc_try(wpa_s, ssid);
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return;
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} else if (wpa_s->conf->ap_scan == 2) {
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/*
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* User-initiated scan request in ap_scan == 2; scan with
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* wildcard SSID.
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*/
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ssid = NULL;
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} else {
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struct wpa_ssid *start = ssid, *tssid;
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int freqs_set = 0;
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if (ssid == NULL && max_ssids > 1)
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ssid = wpa_s->conf->ssid;
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while (ssid) {
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if (!ssid->disabled && ssid->scan_ssid) {
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wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
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ssid->ssid, ssid->ssid_len);
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params.ssids[params.num_ssids].ssid =
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ssid->ssid;
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params.ssids[params.num_ssids].ssid_len =
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ssid->ssid_len;
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params.num_ssids++;
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if (params.num_ssids + 1 >= max_ssids)
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break;
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}
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ssid = ssid->next;
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if (ssid == start)
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break;
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if (ssid == NULL && max_ssids > 1 &&
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start != wpa_s->conf->ssid)
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ssid = wpa_s->conf->ssid;
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}
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for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
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if (tssid->disabled)
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continue;
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if ((params.freqs || !freqs_set) && tssid->scan_freq) {
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int_array_concat(¶ms.freqs,
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tssid->scan_freq);
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} else {
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os_free(params.freqs);
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params.freqs = NULL;
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}
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freqs_set = 1;
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}
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int_array_sort_unique(params.freqs);
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}
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if (ssid) {
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wpa_s->prev_scan_ssid = ssid;
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if (max_ssids > 1) {
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wpa_printf(MSG_DEBUG, "Include wildcard SSID in the "
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"scan request");
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params.num_ssids++;
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}
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wpa_printf(MSG_DEBUG, "Starting AP scan for specific SSID(s)");
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} else {
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wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
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params.num_ssids++;
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wpa_printf(MSG_DEBUG, "Starting AP scan for wildcard SSID");
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}
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#ifdef CONFIG_WPS
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if (wps) {
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wps_ie = wps_build_probe_req_ie(wps == 2, &wpa_s->wps->dev,
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wpa_s->wps->uuid, req_type);
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if (wps_ie) {
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params.extra_ies = wpabuf_head(wps_ie);
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params.extra_ies_len = wpabuf_len(wps_ie);
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}
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}
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#endif /* CONFIG_WPS */
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ret = wpa_supplicant_trigger_scan(wpa_s, ¶ms);
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wpabuf_free(wps_ie);
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os_free(params.freqs);
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if (ret) {
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wpa_printf(MSG_WARNING, "Failed to initiate AP scan.");
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wpa_supplicant_req_scan(wpa_s, 10, 0);
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} else
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wpa_s->scan_runs++;
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}
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/**
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* wpa_supplicant_req_scan - Schedule a scan for neighboring access points
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* @wpa_s: Pointer to wpa_supplicant data
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* @sec: Number of seconds after which to scan
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* @usec: Number of microseconds after which to scan
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*
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* This function is used to schedule a scan for neighboring access points after
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* the specified time.
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*/
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void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
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{
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/* If there's at least one network that should be specifically scanned
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* then don't cancel the scan and reschedule. Some drivers do
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* background scanning which generates frequent scan results, and that
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* causes the specific SSID scan to get continually pushed back and
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* never happen, which causes hidden APs to never get probe-scanned.
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*/
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if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
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wpa_s->conf->ap_scan == 1) {
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struct wpa_ssid *ssid = wpa_s->conf->ssid;
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while (ssid) {
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if (!ssid->disabled && ssid->scan_ssid)
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break;
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ssid = ssid->next;
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}
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if (ssid) {
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wpa_msg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
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"ensure that specific SSID scans occur");
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return;
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}
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}
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wpa_msg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
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sec, usec);
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eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
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eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
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}
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/**
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* wpa_supplicant_cancel_scan - Cancel a scheduled scan request
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* @wpa_s: Pointer to wpa_supplicant data
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*
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* This function is used to cancel a scan request scheduled with
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* wpa_supplicant_req_scan().
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*/
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void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
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{
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wpa_msg(wpa_s, MSG_DEBUG, "Cancelling scan request");
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eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
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}
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void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
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int scanning)
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{
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if (wpa_s->scanning != scanning) {
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wpa_s->scanning = scanning;
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wpas_notify_scanning(wpa_s);
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}
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}
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static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
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{
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int rate = 0;
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const u8 *ie;
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int i;
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ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
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for (i = 0; ie && i < ie[1]; i++) {
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if ((ie[i + 2] & 0x7f) > rate)
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rate = ie[i + 2] & 0x7f;
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}
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ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
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for (i = 0; ie && i < ie[1]; i++) {
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if ((ie[i + 2] & 0x7f) > rate)
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rate = ie[i + 2] & 0x7f;
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}
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return rate;
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}
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const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
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{
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const u8 *end, *pos;
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pos = (const u8 *) (res + 1);
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end = pos + res->ie_len;
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while (pos + 1 < end) {
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if (pos + 2 + pos[1] > end)
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break;
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if (pos[0] == ie)
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return pos;
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pos += 2 + pos[1];
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}
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return NULL;
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}
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const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
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u32 vendor_type)
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{
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const u8 *end, *pos;
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pos = (const u8 *) (res + 1);
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end = pos + res->ie_len;
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while (pos + 1 < end) {
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if (pos + 2 + pos[1] > end)
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break;
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if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
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vendor_type == WPA_GET_BE32(&pos[2]))
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return pos;
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pos += 2 + pos[1];
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}
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return NULL;
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}
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struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
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u32 vendor_type)
|
|
{
|
|
struct wpabuf *buf;
|
|
const u8 *end, *pos;
|
|
|
|
buf = wpabuf_alloc(res->ie_len);
|
|
if (buf == NULL)
|
|
return NULL;
|
|
|
|
pos = (const u8 *) (res + 1);
|
|
end = pos + res->ie_len;
|
|
|
|
while (pos + 1 < end) {
|
|
if (pos + 2 + pos[1] > end)
|
|
break;
|
|
if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
|
|
vendor_type == WPA_GET_BE32(&pos[2]))
|
|
wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
|
|
pos += 2 + pos[1];
|
|
}
|
|
|
|
if (wpabuf_len(buf) == 0) {
|
|
wpabuf_free(buf);
|
|
buf = NULL;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
|
|
/* Compare function for sorting scan results. Return >0 if @b is considered
|
|
* better. */
|
|
static int wpa_scan_result_compar(const void *a, const void *b)
|
|
{
|
|
struct wpa_scan_res **_wa = (void *) a;
|
|
struct wpa_scan_res **_wb = (void *) b;
|
|
struct wpa_scan_res *wa = *_wa;
|
|
struct wpa_scan_res *wb = *_wb;
|
|
int wpa_a, wpa_b, maxrate_a, maxrate_b;
|
|
|
|
/* WPA/WPA2 support preferred */
|
|
wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
|
|
wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
|
|
wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
|
|
wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
|
|
|
|
if (wpa_b && !wpa_a)
|
|
return 1;
|
|
if (!wpa_b && wpa_a)
|
|
return -1;
|
|
|
|
/* privacy support preferred */
|
|
if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
|
|
(wb->caps & IEEE80211_CAP_PRIVACY))
|
|
return 1;
|
|
if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
|
|
(wb->caps & IEEE80211_CAP_PRIVACY) == 0)
|
|
return -1;
|
|
|
|
/* best/max rate preferred if signal level close enough XXX */
|
|
if ((wa->level && wb->level && abs(wb->level - wa->level) < 5) ||
|
|
(wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
|
|
maxrate_a = wpa_scan_get_max_rate(wa);
|
|
maxrate_b = wpa_scan_get_max_rate(wb);
|
|
if (maxrate_a != maxrate_b)
|
|
return maxrate_b - maxrate_a;
|
|
}
|
|
|
|
/* use freq for channel preference */
|
|
|
|
/* all things being equal, use signal level; if signal levels are
|
|
* identical, use quality values since some drivers may only report
|
|
* that value and leave the signal level zero */
|
|
if (wb->level == wa->level)
|
|
return wb->qual - wa->qual;
|
|
return wb->level - wa->level;
|
|
}
|
|
|
|
|
|
/**
|
|
* wpa_supplicant_get_scan_results - Get scan results
|
|
* @wpa_s: Pointer to wpa_supplicant data
|
|
* @info: Information about what was scanned or %NULL if not available
|
|
* @new_scan: Whether a new scan was performed
|
|
* Returns: Scan results, %NULL on failure
|
|
*
|
|
* This function request the current scan results from the driver and updates
|
|
* the local BSS list wpa_s->bss. The caller is responsible for freeing the
|
|
* results with wpa_scan_results_free().
|
|
*/
|
|
struct wpa_scan_results *
|
|
wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
|
|
struct scan_info *info, int new_scan)
|
|
{
|
|
struct wpa_scan_results *scan_res;
|
|
size_t i;
|
|
|
|
if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
|
|
scan_res = ieee80211_sta_get_scan_results(wpa_s);
|
|
else
|
|
scan_res = wpa_drv_get_scan_results2(wpa_s);
|
|
if (scan_res == NULL) {
|
|
wpa_printf(MSG_DEBUG, "Failed to get scan results");
|
|
return NULL;
|
|
}
|
|
|
|
qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
|
|
wpa_scan_result_compar);
|
|
|
|
wpa_bss_update_start(wpa_s);
|
|
for (i = 0; i < scan_res->num; i++)
|
|
wpa_bss_update_scan_res(wpa_s, scan_res->res[i]);
|
|
wpa_bss_update_end(wpa_s, info, new_scan);
|
|
|
|
return scan_res;
|
|
}
|
|
|
|
|
|
int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
|
|
{
|
|
struct wpa_scan_results *scan_res;
|
|
scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
|
|
if (scan_res == NULL)
|
|
return -1;
|
|
wpa_scan_results_free(scan_res);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void wpa_scan_results_free(struct wpa_scan_results *res)
|
|
{
|
|
size_t i;
|
|
|
|
if (res == NULL)
|
|
return;
|
|
|
|
for (i = 0; i < res->num; i++)
|
|
os_free(res->res[i]);
|
|
os_free(res->res);
|
|
os_free(res);
|
|
}
|