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/*
* Copyright (c) 2012-2018 Arne Schwabe
* Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
*/
package de.blinkt.openvpn.api;
import android.annotation.TargetApi;
import android.content.*;
import android.os.Build;
import android.os.Bundle;
import android.os.Parcelable;
import de.blinkt.openvpn.VpnProfile;
import de.blinkt.openvpn.core.ConfigParser;
import de.blinkt.openvpn.core.Connection;
import de.blinkt.openvpn.core.ProfileManager;
import de.blinkt.openvpn.core.VpnStatus;
import java.io.IOException;
import java.io.StringReader;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.*;
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public class AppRestrictions {
public static final String PROFILE_CREATOR = "de.blinkt.openvpn.api.AppRestrictions";
final static int CONFIG_VERSION = 1;
static boolean alreadyChecked = false;
private static AppRestrictions mInstance;
private RestrictionsManager mRestrictionsMgr;
private BroadcastReceiver mRestrictionsReceiver;
private AppRestrictions(Context c) {
}
public static AppRestrictions getInstance(Context c) {
if (mInstance == null)
mInstance = new AppRestrictions(c);
return mInstance;
}
private void addChangesListener(Context c) {
IntentFilter restrictionsFilter =
new IntentFilter(Intent.ACTION_APPLICATION_RESTRICTIONS_CHANGED);
mRestrictionsReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
applyRestrictions(context);
}
};
c.registerReceiver(mRestrictionsReceiver, restrictionsFilter);
}
private void removeChangesListener(Context c) {
c.unregisterReceiver(mRestrictionsReceiver);
}
private String hashConfig(String config) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance("SHA1");
byte utf8_bytes[] = config.getBytes();
digest.update(utf8_bytes, 0, utf8_bytes.length);
return new BigInteger(1, digest.digest()).toString(16);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return null;
}
}
private void applyRestrictions(Context c) {
mRestrictionsMgr = (RestrictionsManager) c.getSystemService(Context.RESTRICTIONS_SERVICE);
if (mRestrictionsMgr == null)
return;
Bundle restrictions = mRestrictionsMgr.getApplicationRestrictions();
if (restrictions == null)
return;
String configVersion = restrictions.getString("version", "(not set)");
try {
if (Integer.parseInt(configVersion) != CONFIG_VERSION)
throw new NumberFormatException("Wrong version");
} catch (NumberFormatException nex) {
if ("(not set)".equals(configVersion))
// Ignore error if no version present
return;
VpnStatus.logError(String.format(Locale.US, "App restriction version %s does not match expected version %d", configVersion, CONFIG_VERSION));
return;
}
Parcelable[] profileList = restrictions.getParcelableArray(("vpn_configuration_list"));
if (profileList == null) {
VpnStatus.logError("App restriction does not contain a profile list (vpn_configuration_list)");
return;
}
Set<String> provisionedUuids = new HashSet<>();
ProfileManager pm = ProfileManager.getInstance(c);
for (Parcelable profile : profileList) {
if (!(profile instanceof Bundle)) {
VpnStatus.logError("App restriction profile has wrong type");
continue;
}
Bundle p = (Bundle) profile;
String uuid = p.getString("uuid");
String ovpn = p.getString("ovpn");
String name = p.getString("name");
if (uuid == null || ovpn == null || name == null) {
VpnStatus.logError("App restriction profile misses uuid, ovpn or name key");
continue;
}
String ovpnHash = hashConfig(ovpn);
provisionedUuids.add(uuid.toLowerCase(Locale.ENGLISH));
// Check if the profile already exists
VpnProfile vpnProfile = ProfileManager.get(c, uuid);
if (vpnProfile != null) {
// Profile exists, check if need to update it
if (ovpnHash.equals(vpnProfile.importedProfileHash))
// not modified skip to next profile
continue;
}
addProfile(c, ovpn, uuid, name, vpnProfile);
}
Vector<VpnProfile> profilesToRemove = new Vector<>();
// get List of all managed profiles
for (VpnProfile vp: pm.getProfiles())
{
if (PROFILE_CREATOR.equals(vp.mProfileCreator)) {
if (!provisionedUuids.contains(vp.getUUIDString()))
profilesToRemove.add(vp);
}
}
for (VpnProfile vp: profilesToRemove) {
VpnStatus.logInfo("Remove with uuid: %s and name: %s since it is no longer in the list of managed profiles");
pm.removeProfile(c, vp);
}
}
private String prepare(String config) {
String newLine = System.getProperty("line.separator");
if (!config.contains(newLine)&& !config.contains(" ")) {
try {
byte[] decoded = android.util.Base64.decode(config.getBytes(), android.util.Base64.DEFAULT);
config = new String(decoded);
return config;
} catch(IllegalArgumentException e) {
}
}
return config;
};
private void addProfile(Context c, String config, String uuid, String name, VpnProfile vpnProfile) {
config = prepare(config);
ConfigParser cp = new ConfigParser();
try {
cp.parseConfig(new StringReader(config));
VpnProfile vp = cp.convertProfile();
vp.mProfileCreator = PROFILE_CREATOR;
// We don't want provisioned profiles to be editable
vp.mUserEditable = false;
vp.mName = name;
vp.setUUID(UUID.fromString(uuid));
vp.importedProfileHash = hashConfig(config);
ProfileManager pm = ProfileManager.getInstance(c);
if (vpnProfile != null) {
vp.mVersion = vpnProfile.mVersion + 1;
vp.mAlias = vpnProfile.mAlias;
}
// The add method will replace any older profiles with the same UUID
pm.addProfile(vp);
pm.saveProfile(c, vp);
pm.saveProfileList(c);
} catch (ConfigParser.ConfigParseError | IOException | IllegalArgumentException e) {
VpnStatus.logException("Error during import of managed profile", e);
}
}
public void checkRestrictions(Context c) {
if (alreadyChecked) {
return;
}
alreadyChecked = true;
addChangesListener(c);
applyRestrictions(c);
}
public void pauseCheckRestrictions(Context c)
{
removeChangesListener(c);
}
}
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