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/**
* Copyright (c) 2018 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;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.os.Build;
import android.support.annotation.NonNull;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.net.UnknownHostException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.cert.CertificateException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import okhttp3.CipherSuite;
import okhttp3.ConnectionSpec;
import okhttp3.Cookie;
import okhttp3.CookieJar;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.TlsVersion;
import static android.text.TextUtils.isEmpty;
import static se.leap.bitmaskclient.ProviderAPI.ERRORS;
import static se.leap.bitmaskclient.R.string.certificate_error;
import static se.leap.bitmaskclient.R.string.error_io_exception_user_message;
import static se.leap.bitmaskclient.R.string.error_no_such_algorithm_exception_user_message;
import static se.leap.bitmaskclient.R.string.keyChainAccessError;
import static se.leap.bitmaskclient.R.string.server_unreachable_message;
/**
* Created by cyberta on 08.01.18.
*/
public class OkHttpClientGenerator {
SharedPreferences preferences;
Resources resources;
public OkHttpClientGenerator(SharedPreferences preferences, Resources resources) {
this.preferences = preferences;
this.resources = resources;
}
public OkHttpClient initCommercialCAHttpClient(JSONObject initError) {
return initHttpClient(initError, null);
}
public OkHttpClient initSelfSignedCAHttpClient(JSONObject initError) {
String certificate = preferences.getString(Provider.CA_CERT, "");
return initHttpClient(initError, certificate);
}
public OkHttpClient initSelfSignedCAHttpClient(JSONObject initError, String certificate) {
return initHttpClient(initError, certificate);
}
private OkHttpClient initHttpClient(JSONObject initError, String certificate) {
try {
TLSCompatSocketFactory sslCompatFactory;
ConnectionSpec spec = getConnectionSpec();
OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder();
if (!isEmpty(certificate)) {
sslCompatFactory = new TLSCompatSocketFactory(certificate);
} else {
sslCompatFactory = new TLSCompatSocketFactory();
}
sslCompatFactory.initSSLSocketFactory(clientBuilder);
clientBuilder.cookieJar(getCookieJar())
.connectionSpecs(Collections.singletonList(spec));
return clientBuilder.build();
} catch (IllegalArgumentException e) {
e.printStackTrace();
addErrorMessageToJson(initError, resources.getString(R.string.certificate_error));
} catch (IllegalStateException | KeyManagementException | KeyStoreException e) {
e.printStackTrace();
addErrorMessageToJson(initError, String.format(resources.getString(keyChainAccessError), e.getLocalizedMessage()));
} catch (NoSuchAlgorithmException | NoSuchProviderException e) {
e.printStackTrace();
addErrorMessageToJson(initError, resources.getString(error_no_such_algorithm_exception_user_message));
} catch (CertificateException e) {
e.printStackTrace();
addErrorMessageToJson(initError, resources.getString(certificate_error));
} catch (UnknownHostException e) {
e.printStackTrace();
addErrorMessageToJson(initError, resources.getString(server_unreachable_message));
} catch (IOException e) {
e.printStackTrace();
addErrorMessageToJson(initError, resources.getString(error_io_exception_user_message));
}
return null;
}
@NonNull
private ConnectionSpec getConnectionSpec() {
ConnectionSpec.Builder connectionSpecbuilder = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
.tlsVersions(TlsVersion.TLS_1_2, TlsVersion.TLS_1_3);
//FIXME: restrict connection further to the following recommended cipher suites for ALL supported API levels
//figure out how to use bcjsse for that purpose
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP_MR1)
connectionSpecbuilder.cipherSuites(
CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
CipherSuite.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
CipherSuite.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
);
return connectionSpecbuilder.build();
}
@NonNull
private CookieJar getCookieJar() {
return new CookieJar() {
private final HashMap<String, List<Cookie>> cookieStore = new HashMap<>();
@Override
public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
cookieStore.put(url.host(), cookies);
}
@Override
public List<Cookie> loadForRequest(HttpUrl url) {
List<Cookie> cookies = cookieStore.get(url.host());
return cookies != null ? cookies : new ArrayList<Cookie>();
}
};
}
private void addErrorMessageToJson(JSONObject jsonObject, String errorMessage) {
try {
jsonObject.put(ERRORS, errorMessage);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
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