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/**
* Copyright (c) 2013, 2014, 2015 LEAP Encryption Access Project and contributers
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package se.leap.bitmaskclient.eip;
import android.content.Context;
import android.content.SharedPreferences;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import de.blinkt.openvpn.VpnProfile;
import de.blinkt.openvpn.core.Connection;
import de.blinkt.openvpn.core.ProfileManager;
import se.leap.bitmaskclient.Provider;
import se.leap.bitmaskclient.utils.PreferenceHelper;
import static se.leap.bitmaskclient.Constants.PROVIDER_PRIVATE_KEY;
import static se.leap.bitmaskclient.Constants.PROVIDER_VPN_CERTIFICATE;
/**
* @author parmegv
*/
public class GatewaysManager {
private Context context;
private SharedPreferences preferences;
private List<Gateway> gateways = new ArrayList<>();
private ProfileManager profileManager;
private Type listType = new TypeToken<ArrayList<Gateway>>() {}.getType();
GatewaysManager(Context context, SharedPreferences preferences) {
this.context = context;
this.preferences = preferences;
profileManager = ProfileManager.getInstance(context);
}
/**
* select closest Gateway
* @return the closest Gateway
*/
public Gateway select() {
GatewaySelector gatewaySelector = new GatewaySelector(gateways);
return gatewaySelector.select();
}
/**
* check if there are no gateways defined
* @return true if no gateways defined else false
*/
public boolean isEmpty() {
return gateways.isEmpty();
}
/**
* @return number of gateways defined in the GatewaysManager
*/
public int size() {
return gateways.size();
}
@Override
public String toString() {
return new Gson().toJson(gateways, listType);
}
/**
* parse gateways from eipDefinition
* @param eipDefinition eipServiceJson
*/
void fromEipServiceJson(JSONObject eipDefinition) {
try {
JSONArray gatewaysDefined = eipDefinition.getJSONArray("gateways");
for (int i = 0; i < gatewaysDefined.length(); i++) {
JSONObject gw = gatewaysDefined.getJSONObject(i);
if (isOpenVpnGateway(gw)) {
JSONObject secrets = secretsConfiguration();
Gateway aux = new Gateway(eipDefinition, secrets, gw);
if (!containsProfileWithSecrets(aux.getProfile())) {
addGateway(aux);
}
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* check if a gateway is an OpenVpn gateway
* @param gateway to check
* @return true if gateway is an OpenVpn gateway otherwise false
*/
private boolean isOpenVpnGateway(JSONObject gateway) {
try {
String transport = gateway.getJSONObject("capabilities").getJSONArray("transport").toString();
return transport.contains("openvpn");
} catch (JSONException e) {
return false;
}
}
private JSONObject secretsConfiguration() {
JSONObject result = new JSONObject();
try {
result.put(Provider.CA_CERT, preferences.getString(Provider.CA_CERT, ""));
result.put(PROVIDER_PRIVATE_KEY, preferences.getString(PROVIDER_PRIVATE_KEY, ""));
result.put(PROVIDER_VPN_CERTIFICATE, preferences.getString(PROVIDER_VPN_CERTIFICATE, ""));
} catch (JSONException e) {
e.printStackTrace();
}
return result;
}
private boolean containsProfileWithSecrets(VpnProfile profile) {
boolean result = false;
Collection<VpnProfile> profiles = profileManager.getProfiles();
for (VpnProfile aux : profiles) {
result = result || sameConnections(profile.mConnections, aux.mConnections)
&& profile.mClientCertFilename.equalsIgnoreCase(aux.mClientCertFilename)
&& profile.mClientKeyFilename.equalsIgnoreCase(aux.mClientKeyFilename);
}
return result;
}
void clearGatewaysAndProfiles() {
gateways.clear();
ArrayList<VpnProfile> profiles = new ArrayList<>(profileManager.getProfiles());
for (VpnProfile profile : profiles) {
profileManager.removeProfile(context, profile);
}
}
private void addGateway(Gateway gateway) {
removeDuplicatedGateway(gateway);
gateways.add(gateway);
VpnProfile profile = gateway.getProfile();
profileManager.addProfile(profile);
}
private void removeDuplicatedGateway(Gateway gateway) {
Iterator<Gateway> it = gateways.iterator();
List<Gateway> gatewaysToRemove = new ArrayList<>();
while (it.hasNext()) {
Gateway aux = it.next();
if (sameConnections(aux.getProfile().mConnections, gateway.getProfile().mConnections)) {
gatewaysToRemove.add(aux);
}
}
gateways.removeAll(gatewaysToRemove);
removeDuplicatedProfiles(gateway.getProfile());
}
private void removeDuplicatedProfiles(VpnProfile original) {
Collection<VpnProfile> profiles = profileManager.getProfiles();
List<VpnProfile> removeList = new ArrayList<>();
for (VpnProfile aux : profiles) {
if (sameConnections(original.mConnections, aux.mConnections)) {
removeList.add(aux);
}
}
for (VpnProfile profile : removeList) {
profileManager.removeProfile(context, profile);
}
}
/**
* check if all connections in c1 are also in c2
* @param c1 array of connections
* @param c2 array of connections
* @return true if all connections of c1 exist in c2 and vice versa
*/
private boolean sameConnections(Connection[] c1, Connection[] c2) {
int sameConnections = 0;
for (Connection c1_aux : c1) {
for (Connection c2_aux : c2)
if (c2_aux.mServerName.equals(c1_aux.mServerName)) {
sameConnections++;
break;
}
}
return c1.length == c2.length && c1.length == sameConnections;
}
/**
* read EipServiceJson from preferences and set gateways
*/
void configureFromPreferences() {
//TODO: THIS IS A QUICK FIX - it deletes all profiles in ProfileManager, thus it's possible
// to add all gateways from prefs without duplicates, but this should be refactored.
clearGatewaysAndProfiles();
fromEipServiceJson(
PreferenceHelper.getEipDefinitionFromPreferences(preferences)
);
}
}
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