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/**
* Copyright (c) 2013 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.base.utils;
import android.app.PendingIntent;
import android.content.Context;
import android.content.res.Resources;
import android.os.Build;
import android.os.Looper;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.StringRes;
import org.json.JSONException;
import org.json.JSONObject;
import org.spongycastle.util.encoders.Base64;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import de.blinkt.openvpn.core.NativeUtils;
import okhttp3.internal.publicsuffix.PublicSuffixDatabase;
import se.leap.bitmaskclient.BuildConfig;
import se.leap.bitmaskclient.R;
import se.leap.bitmaskclient.providersetup.ProviderAPI;
/**
* Stores constants, and implements auxiliary methods used across all Bitmask Android classes.
* Wraps BuildConfigFields for to support easier unit testing
*
* @author parmegv
* @author MeanderingCode
* @author cyberta
*/
public class ConfigHelper {
final public static String NG_1024 =
"eeaf0ab9adb38dd69c33f80afa8fc5e86072618775ff3c0b9ea2314c9c256576d674df7496ea81d3383b4813d692c6e0e0d5d8e250b98be48e495c1d6089dad15dc7d7b46154d6b6ce8ef4ad69b15d4982559b297bcf1885c529f566660e57ec68edbc3c05726cc02fd4cbf4976eaa9afd5138fe8376435b9fc61d2fc0eb06e3";
final public static BigInteger G = new BigInteger("2");
public static boolean checkErroneousDownload(String downloadedString) {
try {
if (downloadedString == null || downloadedString.isEmpty() || new JSONObject(downloadedString).has(ProviderAPI.ERRORS) || new JSONObject(downloadedString).has(ProviderAPI.BACKEND_ERROR_KEY)) {
return true;
} else {
return false;
}
} catch (NullPointerException | JSONException e) {
return false;
}
}
/**
* Treat the input as the MSB representation of a number,
* and lop off leading zero elements. For efficiency, the
* input is simply returned if no leading zeroes are found.
*
* @param in array to be trimmed
*/
public static byte[] trim(byte[] in) {
if (in.length == 0 || in[0] != 0)
return in;
int len = in.length;
int i = 1;
while (in[i] == 0 && i < len)
++i;
byte[] ret = new byte[len - i];
System.arraycopy(in, i, ret, 0, len - i);
return ret;
}
public static ArrayList<X509Certificate> parseX509CertificatesFromString(String certificateString) {
ArrayList<X509Certificate> certificates = new ArrayList<>();
CertificateFactory cf;
try {
cf = CertificateFactory.getInstance("X.509");
Pattern pattern = Pattern.compile("((-----BEGIN CERTIFICATE-----)([A-Za-z0-9+/=\\n]+)(-----END CERTIFICATE-----)+)");
Matcher matcher = pattern.matcher(certificateString);
while (matcher.find()) {
String certificate = matcher.group(3);
if (certificate == null) continue;
byte[] certBytes = Base64.decode(certificate.trim());
try (InputStream caInput = new ByteArrayInputStream(certBytes)) {
X509Certificate x509certificate = (X509Certificate) cf.generateCertificate(caInput);
certificates.add(x509certificate);
System.out.println("ca=" + x509certificate.getSubjectDN() + ", SAN= " + x509certificate.getSubjectAlternativeNames());
} catch (IOException | CertificateException | NullPointerException | IllegalArgumentException | ClassCastException e) {
e.printStackTrace();
}
}
return certificates;
} catch (CertificateException e) {
e.printStackTrace();
}
return null;
}
public static void ensureNotOnMainThread(@NonNull Context context) throws IllegalStateException{
Looper looper = Looper.myLooper();
if (looper != null && looper == context.getMainLooper()) {
throw new IllegalStateException(
"calling this from your main thread can lead to deadlock");
}
}
public static boolean preferAnonymousUsage() {
return BuildConfig.priotize_anonymous_usage;
}
/**
*
* @param remoteTimezone
* @return a value between 0.1 and 1.0
*/
public static double getConnectionQualityFromTimezoneDistance(int remoteTimezone) {
int localTimeZone = TimezoneHelper.getCurrentTimezone();
int distance = TimezoneHelper.timezoneDistance(localTimeZone, remoteTimezone);
return Math.max(distance / 12.0, 0.1);
}
public static String getProviderFormattedString(Resources resources, @StringRes int resourceId) {
String appName = resources.getString(R.string.app_name);
return resources.getString(resourceId, appName);
}
public static boolean stringEqual(@Nullable String string1, @Nullable String string2) {
return (string1 == null && string2 == null) ||
(string1 != null && string1.equals(string2));
}
@SuppressWarnings("unused")
// FatWeb Flavor uses that for auto-update
public static String getApkFileName() {
try {
return BuildConfig.update_apk_url.substring(BuildConfig.update_apk_url.lastIndexOf("/"));
} catch (Exception e) {
return null;
}
}
@SuppressWarnings("unused")
// FatWeb Flavor uses that for auto-update
public static String getVersionFileName() {
try {
return BuildConfig.version_file_url.substring(BuildConfig.version_file_url.lastIndexOf("/"));
} catch (Exception e) {
return null;
}
}
@SuppressWarnings("unused")
// FatWeb Flavor uses that for auto-update
public static String getSignatureFileName() {
try {
return BuildConfig.signature_url.substring(BuildConfig.signature_url.lastIndexOf("/"));
} catch (Exception e) {
return null;
}
}
public static boolean isIPv4(String ipv4) {
if (ipv4 == null) {
return false;
}
Matcher matcher = Pattern.compile("^(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\\.){3}(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])$").matcher(ipv4);
return matcher.matches();
}
public static String getDomainFromMainURL(@NonNull String mainUrl) throws NullPointerException {
return PublicSuffixDatabase.Companion.get().getEffectiveTldPlusOne(mainUrl).replaceFirst("http[s]?://", "").replaceFirst("/.*", "");
}
public static boolean isCalyxOSWithTetheringSupport(Context context) {
return SystemPropertiesHelper.contains("ro.calyxos.version", context) &&
Build.VERSION.SDK_INT >= Build.VERSION_CODES.R;
}
public static int getPendingIntentFlags() {
int flags = PendingIntent.FLAG_CANCEL_CURRENT;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
flags |= PendingIntent.FLAG_IMMUTABLE;
}
return flags;
}
public static int getTorTimeout() {
if (NativeUtils.isUnitTest()) {
return 1;
}
return 180;
}
}
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