krackattacks/wpa_supplicant/ap.c

/*
 * WPA Supplicant - Basic AP mode support routines
 * Copyright (c) 2003-2009, Jouni Malinen <j@w1.fi>
 * Copyright (c) 2009, Atheros Communications
 *
 * 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 "utils/includes.h"

#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "ap/hostapd.h"
#include "ap/ap_config.h"
#ifdef NEED_AP_MLME
#include "ap/ieee802_11.h"
#endif /* NEED_AP_MLME */
#include "ap/ieee802_1x.h"
#include "ap/wps_hostapd.h"
#include "ap/ctrl_iface_ap.h"
#include "eap_common/eap_defs.h"
#include "eap_server/eap_methods.h"
#include "eap_common/eap_wsc_common.h"
#include "wps/wps.h"
#include "config_ssid.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "ap.h"


static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
				  struct wpa_ssid *ssid,
				  struct hostapd_config *conf)
{
	struct hostapd_bss_config *bss = &conf->bss[0];
	int pairwise;

	conf->driver = wpa_s->driver;

	os_strlcpy(bss->iface, wpa_s->ifname, sizeof(bss->iface));

	if (ssid->frequency == 0) {
		/* default channel 11 */
		conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
		conf->channel = 11;
	} else if (ssid->frequency >= 2412 && ssid->frequency <= 2472) {
		conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
		conf->channel = (ssid->frequency - 2407) / 5;
	} else if ((ssid->frequency >= 5180 && ssid->frequency <= 5240) ||
		   (ssid->frequency >= 5745 && ssid->frequency <= 5825)) {
		conf->hw_mode = HOSTAPD_MODE_IEEE80211A;
		conf->channel = (ssid->frequency - 5000) / 5;
	} else {
		wpa_printf(MSG_ERROR, "Unsupported AP mode frequency: %d MHz",
			   ssid->frequency);
		return -1;
	}

	/* TODO: enable HT if driver supports it;
	 * drop to 11b if driver does not support 11g */

	if (ssid->ssid_len == 0) {
		wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
		return -1;
	}
	os_memcpy(bss->ssid.ssid, ssid->ssid, ssid->ssid_len);
	bss->ssid.ssid[ssid->ssid_len] = '\0';
	bss->ssid.ssid_len = ssid->ssid_len;
	bss->ssid.ssid_set = 1;

	if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt))
		bss->wpa = ssid->proto;
	bss->wpa_key_mgmt = ssid->key_mgmt;
	bss->wpa_pairwise = ssid->pairwise_cipher;
	if (ssid->passphrase) {
		bss->ssid.wpa_passphrase = os_strdup(ssid->passphrase);
	} else if (ssid->psk_set) {
		os_free(bss->ssid.wpa_psk);
		bss->ssid.wpa_psk = os_zalloc(sizeof(struct hostapd_wpa_psk));
		if (bss->ssid.wpa_psk == NULL)
			return -1;
		os_memcpy(bss->ssid.wpa_psk->psk, ssid->psk, PMK_LEN);
		bss->ssid.wpa_psk->group = 1;
	}

	/* Select group cipher based on the enabled pairwise cipher suites */
	pairwise = 0;
	if (bss->wpa & 1)
		pairwise |= bss->wpa_pairwise;
	if (bss->wpa & 2) {
		if (bss->rsn_pairwise == 0)
			bss->rsn_pairwise = bss->wpa_pairwise;
		pairwise |= bss->rsn_pairwise;
	}
	if (pairwise & WPA_CIPHER_TKIP)
		bss->wpa_group = WPA_CIPHER_TKIP;
	else
		bss->wpa_group = WPA_CIPHER_CCMP;

	if (bss->wpa && bss->ieee802_1x)
		bss->ssid.security_policy = SECURITY_WPA;
	else if (bss->wpa)
		bss->ssid.security_policy = SECURITY_WPA_PSK;
	else if (bss->ieee802_1x) {
		bss->ssid.security_policy = SECURITY_IEEE_802_1X;
		bss->ssid.wep.default_len = bss->default_wep_key_len;
	} else if (bss->ssid.wep.keys_set)
		bss->ssid.security_policy = SECURITY_STATIC_WEP;
	else
		bss->ssid.security_policy = SECURITY_PLAINTEXT;

#ifdef CONFIG_WPS
	/*
	 * Enable WPS by default, but require user interaction to actually use
	 * it. Only the internal Registrar is supported.
	 */
	bss->eap_server = 1;
	bss->wps_state = 2;
	bss->ap_setup_locked = 1;
	if (wpa_s->conf->config_methods)
		bss->config_methods = os_strdup(wpa_s->conf->config_methods);
	if (wpa_s->conf->device_type)
		bss->device_type = os_strdup(wpa_s->conf->device_type);
#endif /* CONFIG_WPS */

	return 0;
}


int wpa_supplicant_create_ap(struct wpa_supplicant *wpa_s,
			     struct wpa_ssid *ssid)
{
	struct wpa_driver_associate_params params;
	struct hostapd_iface *hapd_iface;
	struct hostapd_config *conf;
	size_t i;

	if (ssid->ssid == NULL || ssid->ssid_len == 0) {
		wpa_printf(MSG_ERROR, "No SSID configured for AP mode");
		return -1;
	}

	wpa_supplicant_ap_deinit(wpa_s);

	wpa_printf(MSG_DEBUG, "Setting up AP (SSID='%s')",
		   wpa_ssid_txt(ssid->ssid, ssid->ssid_len));

	os_memset(&params, 0, sizeof(params));
	params.ssid = ssid->ssid;
	params.ssid_len = ssid->ssid_len;
	switch (ssid->mode) {
	case WPAS_MODE_INFRA:
		params.mode = IEEE80211_MODE_INFRA;
		break;
	case WPAS_MODE_IBSS:
		params.mode = IEEE80211_MODE_IBSS;
		break;
	case WPAS_MODE_AP:
		params.mode = IEEE80211_MODE_AP;
		break;
	}
	params.freq = ssid->frequency;

	if (ssid->key_mgmt & WPA_KEY_MGMT_PSK)
		wpa_s->key_mgmt = WPA_KEY_MGMT_PSK;
	else
		wpa_s->key_mgmt = WPA_KEY_MGMT_NONE;
	params.key_mgmt_suite = key_mgmt2driver(wpa_s->key_mgmt);

	if (ssid->pairwise_cipher & WPA_CIPHER_CCMP)
		wpa_s->pairwise_cipher = WPA_CIPHER_CCMP;
	else if (ssid->pairwise_cipher & WPA_CIPHER_TKIP)
		wpa_s->pairwise_cipher = WPA_CIPHER_TKIP;
	else if (ssid->pairwise_cipher & WPA_CIPHER_NONE)
		wpa_s->pairwise_cipher = WPA_CIPHER_NONE;
	else {
		wpa_printf(MSG_WARNING, "WPA: Failed to select pairwise "
			   "cipher.");
		return -1;
	}
	params.pairwise_suite = cipher_suite2driver(wpa_s->pairwise_cipher);
	params.group_suite = params.pairwise_suite;

	if (wpa_drv_associate(wpa_s, &params) < 0) {
		wpa_msg(wpa_s, MSG_INFO, "Failed to start AP functionality");
		return -1;
	}

	wpa_s->ap_iface = hapd_iface = os_zalloc(sizeof(*wpa_s->ap_iface));
	if (hapd_iface == NULL)
		return -1;
	hapd_iface->owner = wpa_s;

	wpa_s->ap_iface->conf = conf = hostapd_config_defaults();
	if (conf == NULL) {
		wpa_supplicant_ap_deinit(wpa_s);
		return -1;
	}

	if (wpa_supplicant_conf_ap(wpa_s, ssid, conf)) {
		wpa_printf(MSG_ERROR, "Failed to create AP configuration");
		wpa_supplicant_ap_deinit(wpa_s);
		return -1;
	}

	hapd_iface->num_bss = conf->num_bss;
	hapd_iface->bss = os_zalloc(conf->num_bss *
				    sizeof(struct hostapd_data *));
	if (hapd_iface->bss == NULL) {
		wpa_supplicant_ap_deinit(wpa_s);
		return -1;
	}

	for (i = 0; i < conf->num_bss; i++) {
		hapd_iface->bss[i] =
			hostapd_alloc_bss_data(hapd_iface, conf,
					       &conf->bss[i]);
		if (hapd_iface->bss[i] == NULL) {
			wpa_supplicant_ap_deinit(wpa_s);
			return -1;
		}

		hapd_iface->bss[i]->msg_ctx = wpa_s;
	}

	os_memcpy(hapd_iface->bss[0]->own_addr, wpa_s->own_addr, ETH_ALEN);
	hapd_iface->bss[0]->driver = wpa_s->driver;
	hapd_iface->bss[0]->drv_priv = wpa_s->drv_priv;

	if (hostapd_setup_interface(wpa_s->ap_iface)) {
		wpa_printf(MSG_ERROR, "Failed to initialize AP interface");
		wpa_supplicant_ap_deinit(wpa_s);
		return -1;
	}

	wpa_s->current_ssid = ssid;
	os_memcpy(wpa_s->bssid, wpa_s->own_addr, ETH_ALEN);
	wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);

	if (wpa_s->ap_configured_cb)
		wpa_s->ap_configured_cb(wpa_s->ap_configured_cb_ctx,
					wpa_s->ap_configured_cb_data);

	return 0;
}


void wpa_supplicant_ap_deinit(struct wpa_supplicant *wpa_s)
{
	if (wpa_s->ap_iface == NULL)
		return;

	wpa_s->current_ssid = NULL;
	hostapd_interface_deinit(wpa_s->ap_iface);
	hostapd_interface_free(wpa_s->ap_iface);
	wpa_s->ap_iface = NULL;
	wpa_drv_deinit_ap(wpa_s);
}


void ap_tx_status(void *ctx, const u8 *addr,
		  const u8 *buf, size_t len, int ack)
{
#ifdef NEED_AP_MLME
	struct wpa_supplicant *wpa_s = ctx;
	hostapd_tx_status(wpa_s->ap_iface->bss[0], addr, buf, len, ack);
#endif /* NEED_AP_MLME */
}


void ap_rx_from_unknown_sta(void *ctx, const u8 *frame, size_t len)
{
#ifdef NEED_AP_MLME
	struct wpa_supplicant *wpa_s = ctx;
	const struct ieee80211_hdr *hdr =
		(const struct ieee80211_hdr *) frame;
	u16 fc = le_to_host16(hdr->frame_control);
	ieee802_11_rx_from_unknown(wpa_s->ap_iface->bss[0], hdr->addr2,
				   (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
				   (WLAN_FC_TODS | WLAN_FC_FROMDS));
#endif /* NEED_AP_MLME */
}


void ap_mgmt_rx(void *ctx, struct rx_mgmt *rx_mgmt)
{
#ifdef NEED_AP_MLME
	struct wpa_supplicant *wpa_s = ctx;
	struct hostapd_frame_info fi;
	os_memset(&fi, 0, sizeof(fi));
	fi.datarate = rx_mgmt->datarate;
	fi.ssi_signal = rx_mgmt->ssi_signal;
	ieee802_11_mgmt(wpa_s->ap_iface->bss[0], rx_mgmt->frame,
			rx_mgmt->frame_len, &fi);
#endif /* NEED_AP_MLME */
}


void ap_mgmt_tx_cb(void *ctx, const u8 *buf, size_t len, u16 stype, int ok)
{
#ifdef NEED_AP_MLME
	struct wpa_supplicant *wpa_s = ctx;
	ieee802_11_mgmt_cb(wpa_s->ap_iface->bss[0], buf, len, stype, ok);
#endif /* NEED_AP_MLME */
}


void wpa_supplicant_ap_rx_eapol(struct wpa_supplicant *wpa_s,
				const u8 *src_addr, const u8 *buf, size_t len)
{
	ieee802_1x_receive(wpa_s->ap_iface->bss[0], src_addr, buf, len);
}


#ifdef CONFIG_WPS

int wpa_supplicant_ap_wps_pbc(struct wpa_supplicant *wpa_s, const u8 *bssid)
{
	if (!wpa_s->ap_iface)
		return -1;
	return hostapd_wps_button_pushed(wpa_s->ap_iface->bss[0]);
}


int wpa_supplicant_ap_wps_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
			      const char *pin, char *buf, size_t buflen)
{
	int ret, ret_len = 0;

	if (!wpa_s->ap_iface)
		return -1;

	if (pin == NULL) {
		unsigned int rpin = wps_generate_pin();
		ret_len = os_snprintf(buf, buflen, "%d", rpin);
		pin = buf;
	}

	ret = hostapd_wps_add_pin(wpa_s->ap_iface->bss[0], "any", pin, 0);
	if (ret)
		return -1;
	return ret_len;
}

#endif /* CONFIG_WPS */


#ifdef CONFIG_CTRL_IFACE

int ap_ctrl_iface_sta_first(struct wpa_supplicant *wpa_s,
			    char *buf, size_t buflen)
{
	if (wpa_s->ap_iface == NULL)
		return -1;
	return hostapd_ctrl_iface_sta_first(wpa_s->ap_iface->bss[0],
					    buf, buflen);
}


int ap_ctrl_iface_sta(struct wpa_supplicant *wpa_s, const char *txtaddr,
		      char *buf, size_t buflen)
{
	if (wpa_s->ap_iface == NULL)
		return -1;
	return hostapd_ctrl_iface_sta(wpa_s->ap_iface->bss[0], txtaddr,
				      buf, buflen);
}


int ap_ctrl_iface_sta_next(struct wpa_supplicant *wpa_s, const char *txtaddr,
			   char *buf, size_t buflen)
{
	if (wpa_s->ap_iface == NULL)
		return -1;
	return hostapd_ctrl_iface_sta_next(wpa_s->ap_iface->bss[0], txtaddr,
					   buf, buflen);
}


int ap_ctrl_iface_wpa_get_status(struct wpa_supplicant *wpa_s, char *buf,
				 size_t buflen, int verbose)
{
	char *pos = buf, *end = buf + buflen;
	int ret;
	struct hostapd_bss_config *conf;

	if (wpa_s->ap_iface == NULL)
		return -1;

	conf = wpa_s->ap_iface->bss[0]->conf;
	if (conf->wpa == 0)
		return 0;

	ret = os_snprintf(pos, end - pos,
			  "pairwise_cipher=%s\n"
			  "group_cipher=%s\n"
			  "key_mgmt=%s\n",
			  wpa_cipher_txt(conf->rsn_pairwise),
			  wpa_cipher_txt(conf->wpa_group),
			  wpa_key_mgmt_txt(conf->wpa_key_mgmt,
					   conf->wpa));
	if (ret < 0 || ret >= end - pos)
		return pos - buf;
	pos += ret;
	return pos - buf;
}

#endif /* CONFIG_CTRL_IFACE */