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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.Bundle;
import android.util.Pair;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.List;
import java.util.Scanner;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import okhttp3.OkHttpClient;
import se.leap.bitmaskclient.eip.EIP;
import static android.text.TextUtils.isEmpty;
import static se.leap.bitmaskclient.DownloadFailedDialog.DOWNLOAD_ERRORS.ERROR_CERTIFICATE_PINNING;
import static se.leap.bitmaskclient.ProviderAPI.ERRORS;
import static se.leap.bitmaskclient.ProviderAPI.RESULT_KEY;
import static se.leap.bitmaskclient.R.string.certificate_error;
import static se.leap.bitmaskclient.R.string.malformed_url;
import static se.leap.bitmaskclient.R.string.warning_corrupted_provider_cert;
/**
* Created by cyberta on 04.01.18.
*/
public class ProviderApiManager extends ProviderApiManagerBase {
protected static boolean lastDangerOn = true;
public ProviderApiManager(SharedPreferences preferences, Resources resources, OkHttpClientGenerator clientGenerator, ProviderApiServiceCallback callback) {
super(preferences, resources, clientGenerator, callback);
}
public static boolean lastDangerOn() {
return lastDangerOn;
}
/**
* Downloads a provider.json from a given URL, adding a new provider using the given name.
*
* @param task containing a boolean meaning if the provider is custom or not, another boolean meaning if the user completely trusts this provider, the provider name and its provider.json url.
* @return a bundle with a boolean value mapped to a key named RESULT_KEY, and which is true if the update was successful.
*/
@Override
protected Bundle setUpProvider(Bundle task) {
int progress = 0;
Bundle currentDownload = new Bundle();
if (task != null) {
lastDangerOn = task.containsKey(ProviderListContent.ProviderItem.DANGER_ON) && task.getBoolean(ProviderListContent.ProviderItem.DANGER_ON);
lastProviderMainUrl = task.containsKey(Provider.MAIN_URL) ?
task.getString(Provider.MAIN_URL) :
"";
if (isEmpty(lastProviderMainUrl)) {
setErrorResult(currentDownload, malformed_url, null);
return currentDownload;
}
providerCaCertFingerprint = task.containsKey(Provider.CA_CERT_FINGERPRINT) ?
task.getString(Provider.CA_CERT_FINGERPRINT) :
"";
providerCaCert = task.containsKey(Provider.CA_CERT) ?
task.getString(Provider.CA_CERT) :
"";
try {
providerDefinition = task.containsKey(Provider.KEY) ?
new JSONObject(task.getString(Provider.KEY)) :
new JSONObject();
} catch (JSONException e) {
e.printStackTrace();
providerDefinition = new JSONObject();
}
providerApiUrl = getApiUrlWithVersion(providerDefinition);
checkPersistedProviderUpdates();
currentDownload = validateProviderDetails();
//provider details invalid
if (currentDownload.containsKey(ERRORS)) {
return currentDownload;
}
//no provider certificate available
if (currentDownload.containsKey(RESULT_KEY) && !currentDownload.getBoolean(RESULT_KEY)) {
resetProviderDetails();
}
EIP_SERVICE_JSON_DOWNLOADED = false;
go_ahead = true;
}
if (!PROVIDER_JSON_DOWNLOADED)
currentDownload = getAndSetProviderJson(lastProviderMainUrl, lastDangerOn, providerCaCert, providerDefinition);
if (PROVIDER_JSON_DOWNLOADED || (currentDownload.containsKey(RESULT_KEY) && currentDownload.getBoolean(RESULT_KEY))) {
broadcastProgress(progress++);
PROVIDER_JSON_DOWNLOADED = true;
if (!CA_CERT_DOWNLOADED)
currentDownload = downloadCACert(lastDangerOn);
if (CA_CERT_DOWNLOADED || (currentDownload.containsKey(RESULT_KEY) && currentDownload.getBoolean(RESULT_KEY))) {
broadcastProgress(progress++);
CA_CERT_DOWNLOADED = true;
currentDownload = getAndSetEipServiceJson();
if (currentDownload.containsKey(RESULT_KEY) && currentDownload.getBoolean(RESULT_KEY)) {
broadcastProgress(progress++);
EIP_SERVICE_JSON_DOWNLOADED = true;
}
}
}
return currentDownload;
}
private Bundle getAndSetProviderJson(String providerMainUrl, boolean dangerOn, String caCert, JSONObject providerDefinition) {
Bundle result = new Bundle();
if (go_ahead) {
String providerDotJsonString;
if(providerDefinition.length() == 0 || caCert.isEmpty())
providerDotJsonString = downloadWithCommercialCA(providerMainUrl + "/provider.json", dangerOn);
else
providerDotJsonString = downloadFromApiUrlWithProviderCA("/provider.json", caCert, providerDefinition, dangerOn);
if (!isValidJson(providerDotJsonString)) {
result.putString(ERRORS, resources.getString(malformed_url));
result.putBoolean(RESULT_KEY, false);
return result;
}
try {
JSONObject providerJson = new JSONObject(providerDotJsonString);
String providerDomain = getDomainFromMainURL(lastProviderMainUrl);
providerApiUrl = getApiUrlWithVersion(providerJson);
//String name = providerJson.getString(Provider.NAME);
//TODO setProviderName(name);
preferences.edit().putString(Provider.KEY, providerJson.toString()).
putBoolean(Constants.PROVIDER_ALLOW_ANONYMOUS, providerJson.getJSONObject(Provider.SERVICE).getBoolean(Constants.PROVIDER_ALLOW_ANONYMOUS)).
putBoolean(Constants.PROVIDER_ALLOWED_REGISTERED, providerJson.getJSONObject(Provider.SERVICE).getBoolean(Constants.PROVIDER_ALLOWED_REGISTERED)).
putString(Provider.KEY + "." + providerDomain, providerJson.toString()).commit();
result.putBoolean(RESULT_KEY, true);
} catch (JSONException e) {
String reason_to_fail = pickErrorMessage(providerDotJsonString);
result.putString(ERRORS, reason_to_fail);
result.putBoolean(RESULT_KEY, false);
}
}
return result;
}
/**
* Downloads the eip-service.json from a given URL, and saves eip service capabilities including the offered gateways
* @return a bundle with a boolean value mapped to a key named RESULT_KEY, and which is true if the download was successful.
*/
@Override
protected Bundle getAndSetEipServiceJson() {
Bundle result = new Bundle();
String eip_service_json_string = "";
if (go_ahead) {
try {
JSONObject provider_json = new JSONObject(preferences.getString(Provider.KEY, ""));
String eip_service_url = provider_json.getString(Provider.API_URL) + "/" + provider_json.getString(Provider.API_VERSION) + "/" + EIP.SERVICE_API_PATH;
eip_service_json_string = downloadWithProviderCA(eip_service_url, lastDangerOn);
JSONObject eip_service_json = new JSONObject(eip_service_json_string);
eip_service_json.getInt(Provider.API_RETURN_SERIAL);
preferences.edit().putString(Constants.PROVIDER_KEY, eip_service_json.toString()).commit();
result.putBoolean(RESULT_KEY, true);
} catch (NullPointerException | JSONException e) {
String reason_to_fail = pickErrorMessage(eip_service_json_string);
result.putString(ERRORS, reason_to_fail);
result.putBoolean(RESULT_KEY, false);
}
}
return result;
}
/**
* Downloads a new OpenVPN certificate, attaching authenticated cookie for authenticated certificate.
*
* @return true if certificate was downloaded correctly, false if provider.json is not present in SharedPreferences, or if the certificate url could not be parsed as a URI, or if there was an SSL error.
*/
@Override
protected boolean updateVpnCertificate() {
try {
JSONObject provider_json = new JSONObject(preferences.getString(Provider.KEY, ""));
String provider_main_url = provider_json.getString(Provider.API_URL);
URL new_cert_string_url = new URL(provider_main_url + "/" + provider_json.getString(Provider.API_VERSION) + "/" + Constants.PROVIDER_VPN_CERTIFICATE);
String cert_string = downloadWithProviderCA(new_cert_string_url.toString(), lastDangerOn);
if (cert_string == null || cert_string.isEmpty() || ConfigHelper.checkErroneousDownload(cert_string))
return false;
else
return loadCertificate(cert_string);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
}
private Bundle downloadCACert(boolean dangerOn) {
Bundle result = new Bundle();
try {
JSONObject providerJson = new JSONObject(preferences.getString(Provider.KEY, ""));
String caCertUrl = providerJson.getString(Provider.CA_CERT_URI);
String providerDomain = providerJson.getString(Provider.DOMAIN);
String certString = downloadWithCommercialCA(caCertUrl, dangerOn);
if (validCertificate(certString) && go_ahead) {
preferences.edit().putString(Provider.CA_CERT, certString).commit();
preferences.edit().putString(Provider.CA_CERT + "." + providerDomain, certString).commit();
result.putBoolean(RESULT_KEY, true);
} else {
setErrorResult(result, warning_corrupted_provider_cert, ERROR_CERTIFICATE_PINNING.toString());
}
} catch (JSONException e) {
setErrorResult(result, malformed_url, null);
}
return result;
}
/**
* Tries to download the contents of the provided url using commercially validated CA certificate from chosen provider.
* <p/>
* If danger_on flag is true, SSL exceptions will be managed by futher methods that will try to use some bypass methods.
*
* @param string_url
* @param danger_on if the user completely trusts this provider
* @return
*/
private String downloadWithCommercialCA(String string_url, boolean danger_on) {
String responseString;
JSONObject errorJson = new JSONObject();
OkHttpClient okHttpClient = clientGenerator.initCommercialCAHttpClient(errorJson);
if (okHttpClient == null) {
return errorJson.toString();
}
List<Pair<String, String>> headerArgs = getAuthorizationHeader();
responseString = sendGetStringToServer(string_url, headerArgs, okHttpClient);
if (responseString != null && responseString.contains(ERRORS)) {
try {
// try to download with provider CA on certificate error
JSONObject responseErrorJson = new JSONObject(responseString);
if (danger_on && responseErrorJson.getString(ERRORS).equals(resources.getString(R.string.certificate_error))) {
responseString = downloadWithoutCA(string_url);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return responseString;
}
private String downloadFromApiUrlWithProviderCA(String path, String caCert, JSONObject providerDefinition, boolean dangerOn) {
String responseString;
JSONObject errorJson = new JSONObject();
String baseUrl = getApiUrl(providerDefinition);
OkHttpClient okHttpClient = clientGenerator.initSelfSignedCAHttpClient(errorJson, caCert);
if (okHttpClient == null) {
return errorJson.toString();
}
String urlString = baseUrl + path;
List<Pair<String, String>> headerArgs = getAuthorizationHeader();
responseString = sendGetStringToServer(urlString, headerArgs, okHttpClient);
if (responseString != null && responseString.contains(ERRORS)) {
try {
// try to download with provider CA on certificate error
JSONObject responseErrorJson = new JSONObject(responseString);
if (dangerOn && responseErrorJson.getString(ERRORS).equals(resources.getString(R.string.certificate_error))) {
responseString = downloadWithCommercialCA(urlString, dangerOn);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return responseString;
}
/**
* Tries to download the contents of the provided url using not commercially validated CA certificate from chosen provider.
*
* @param urlString as a string
* @param dangerOn true to download CA certificate in case it has not been downloaded.
* @return an empty string if it fails, the url content if not.
*/
private String downloadWithProviderCA(String urlString, boolean dangerOn) {
JSONObject initError = new JSONObject();
String responseString;
OkHttpClient okHttpClient = clientGenerator.initSelfSignedCAHttpClient(initError);
if (okHttpClient == null) {
return initError.toString();
}
List<Pair<String, String>> headerArgs = getAuthorizationHeader();
responseString = sendGetStringToServer(urlString, headerArgs, okHttpClient);
if (responseString.contains(ERRORS)) {
try {
// danger danger: try to download without CA on certificate error
JSONObject responseErrorJson = new JSONObject(responseString);
if (dangerOn && responseErrorJson.getString(ERRORS).equals(resources.getString(R.string.certificate_error))) {
responseString = downloadWithoutCA(urlString);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return responseString;
}
/**
* Downloads the string that's in the url with any certificate.
*/
// This method is totally insecure anyways. So no need to refactor that in order to use okHttpClient, force modern TLS etc.. DO NOT USE IN PRODUCTION!
private String downloadWithoutCA(String url_string) {
String string = "";
try {
HostnameVerifier hostnameVerifier = new HostnameVerifier() {
@Override
public boolean verify(String hostname, SSLSession session) {
return true;
}
};
class DefaultTrustManager implements X509TrustManager {
@Override
public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
}
@Override
public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
}
@Override
public X509Certificate[] getAcceptedIssuers() {
return null;
}
}
SSLContext context = SSLContext.getInstance("TLS");
context.init(new KeyManager[0], new TrustManager[]{new DefaultTrustManager()}, new SecureRandom());
URL url = new URL(url_string);
HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();
urlConnection.setSSLSocketFactory(context.getSocketFactory());
urlConnection.setHostnameVerifier(hostnameVerifier);
string = new Scanner(urlConnection.getInputStream()).useDelimiter("\\A").next();
System.out.println("String ignoring certificate = " + string);
} catch (FileNotFoundException e) {
e.printStackTrace();
string = formatErrorMessage(malformed_url);
} catch (IOException e) {
// The downloaded certificate doesn't validate our https connection.
e.printStackTrace();
string = formatErrorMessage(certificate_error);
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (KeyManagementException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return string;
}
}
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