/**
* 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 .
*/
package se.leap.bitmaskclient;
import android.app.IntentService;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.os.ResultReceiver;
import android.support.annotation.NonNull;
import android.util.Base64;
import org.json.JSONException;
import org.json.JSONObject;
import org.thoughtcrime.ssl.pinning.util.PinningHelper;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.net.ConnectException;
import java.net.CookieHandler;
import java.net.MalformedURLException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.net.UnknownHostException;
import java.net.UnknownServiceException;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.security.interfaces.RSAPrivateKey;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.NoSuchElementException;
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.SSLHandshakeException;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import okhttp3.CipherSuite;
import okhttp3.ConnectionSpec;
import okhttp3.Cookie;
import okhttp3.CookieJar;
import okhttp3.HttpUrl;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.TlsVersion;
import se.leap.bitmaskclient.ProviderListContent.ProviderItem;
import se.leap.bitmaskclient.eip.Constants;
import se.leap.bitmaskclient.eip.EIP;
import se.leap.bitmaskclient.userstatus.SessionDialog;
import se.leap.bitmaskclient.userstatus.User;
import se.leap.bitmaskclient.userstatus.UserStatus;
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_json_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.malformed_url;
import static se.leap.bitmaskclient.R.string.server_unreachable_message;
import static se.leap.bitmaskclient.R.string.service_is_down_error;
/**
* Implements HTTP api methods used to manage communications with the provider server.
*
* It's an IntentService because it downloads data from the Internet, so it operates in the background.
*
* @author parmegv
* @author MeanderingCode
*/
public class ProviderAPI extends IntentService {
final public static String
TAG = ProviderAPI.class.getSimpleName(),
SET_UP_PROVIDER = "setUpProvider",
DOWNLOAD_NEW_PROVIDER_DOTJSON = "downloadNewProviderDotJSON",
SIGN_UP = "srpRegister",
LOG_IN = "srpAuth",
LOG_OUT = "logOut",
DOWNLOAD_CERTIFICATE = "downloadUserAuthedCertificate",
PARAMETERS = "parameters",
RESULT_KEY = "result",
RECEIVER_KEY = "receiver",
ERRORS = "errors",
UPDATE_PROGRESSBAR = "update_progressbar",
CURRENT_PROGRESS = "current_progress",
DOWNLOAD_EIP_SERVICE = TAG + ".DOWNLOAD_EIP_SERVICE";
final public static int
SUCCESSFUL_LOGIN = 3,
FAILED_LOGIN = 4,
SUCCESSFUL_SIGNUP = 5,
FAILED_SIGNUP = 6,
SUCCESSFUL_LOGOUT = 7,
LOGOUT_FAILED = 8,
CORRECTLY_DOWNLOADED_CERTIFICATE = 9,
INCORRECTLY_DOWNLOADED_CERTIFICATE = 10,
PROVIDER_OK = 11,
PROVIDER_NOK = 12,
CORRECTLY_DOWNLOADED_EIP_SERVICE = 13,
INCORRECTLY_DOWNLOADED_EIP_SERVICE = 14,
INITIALIZATION_ERROR = 15;
private static boolean
CA_CERT_DOWNLOADED = false,
PROVIDER_JSON_DOWNLOADED = false,
EIP_SERVICE_JSON_DOWNLOADED = false;
private static String last_provider_main_url;
private static boolean last_danger_on = false;
private static boolean go_ahead = true;
private static SharedPreferences preferences;
private static String provider_api_url;
private static String provider_ca_cert_fingerprint;
private Resources resources;
public static void stop() {
go_ahead = false;
}
private final MediaType JSON
= MediaType.parse("application/json; charset=utf-8");
private OkHttpClient okHttpClient;
private String initializationError = null;
public ProviderAPI() {
super(TAG);
}
@Override
public void onCreate() {
super.onCreate();
preferences = getSharedPreferences(Dashboard.SHARED_PREFERENCES, MODE_PRIVATE);
resources = getResources();
initOkHttpClient();
}
public static String lastProviderMainUrl() {
return last_provider_main_url;
}
public static boolean lastDangerOn() {
return last_danger_on;
}
@Override
protected void onHandleIntent(Intent command) {
final ResultReceiver receiver = command.getParcelableExtra(RECEIVER_KEY);
if (initializationError != null) {
Bundle result = new Bundle();
result.putString(SessionDialog.ERRORS.INITIALIZATION_ERROR.toString(), initializationError);
result.putBoolean(RESULT_KEY, false);
receiver.send(INITIALIZATION_ERROR, result);
return;
}
String action = command.getAction();
Bundle parameters = command.getBundleExtra(PARAMETERS);
if (provider_api_url == null && preferences.contains(Provider.KEY)) {
try {
JSONObject provider_json = new JSONObject(preferences.getString(Provider.KEY, "no provider"));
provider_api_url = provider_json.getString(Provider.API_URL) + "/" + provider_json.getString(Provider.API_VERSION);
go_ahead = true;
} catch (JSONException e) {
go_ahead = false;
}
}
if (action.equalsIgnoreCase(SET_UP_PROVIDER)) {
Bundle result = setUpProvider(parameters);
if (result.getBoolean(RESULT_KEY)) {
receiver.send(PROVIDER_OK, result);
} else {
receiver.send(PROVIDER_NOK, result);
}
} else if (action.equalsIgnoreCase(SIGN_UP)) {
UserStatus.updateStatus(UserStatus.SessionStatus.SIGNING_UP, resources);
Bundle result = tryToRegister(parameters);
if (result.getBoolean(RESULT_KEY)) {
receiver.send(SUCCESSFUL_SIGNUP, result);
} else {
receiver.send(FAILED_SIGNUP, result);
}
} else if (action.equalsIgnoreCase(LOG_IN)) {
UserStatus.updateStatus(UserStatus.SessionStatus.LOGGING_IN, resources);
Bundle result = tryToAuthenticate(parameters);
if (result.getBoolean(RESULT_KEY)) {
receiver.send(SUCCESSFUL_LOGIN, result);
UserStatus.updateStatus(UserStatus.SessionStatus.LOGGED_IN, resources);
} else {
receiver.send(FAILED_LOGIN, result);
UserStatus.updateStatus(UserStatus.SessionStatus.NOT_LOGGED_IN, resources);
}
} else if (action.equalsIgnoreCase(LOG_OUT)) {
UserStatus.updateStatus(UserStatus.SessionStatus.LOGGING_OUT, resources);
if (logOut()) {
receiver.send(SUCCESSFUL_LOGOUT, Bundle.EMPTY);
android.util.Log.d(TAG, "Logged out, notifying user status");
UserStatus.updateStatus(UserStatus.SessionStatus.LOGGED_OUT, resources);
} else {
receiver.send(LOGOUT_FAILED, Bundle.EMPTY);
UserStatus.updateStatus(UserStatus.SessionStatus.DIDNT_LOG_OUT, resources);
}
} else if (action.equalsIgnoreCase(DOWNLOAD_CERTIFICATE)) {
if (updateVpnCertificate()) {
receiver.send(CORRECTLY_DOWNLOADED_CERTIFICATE, Bundle.EMPTY);
} else {
receiver.send(INCORRECTLY_DOWNLOADED_CERTIFICATE, Bundle.EMPTY);
}
} else if (action.equalsIgnoreCase(DOWNLOAD_EIP_SERVICE)) {
Bundle result = getAndSetEipServiceJson();
if (result.getBoolean(RESULT_KEY)) {
receiver.send(CORRECTLY_DOWNLOADED_EIP_SERVICE, result);
} else {
receiver.send(INCORRECTLY_DOWNLOADED_EIP_SERVICE, result);
}
}
}
private String formatErrorMessage(final int toastStringId) {
return "{ \"" + ERRORS + "\" : \"" + getResources().getString(toastStringId) + "\" }";
}
private JSONObject getErrorMessageAsJson(final int toastStringId) {
try {
return new JSONObject(formatErrorMessage(toastStringId));
} catch (JSONException e) {
e.printStackTrace();
return new JSONObject();
}
}
private void initOkHttpClient() {
try {
ConnectionSpec spec = getConnectionSpec();
OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder();
initSSLSocketFactory(clientBuilder);
clientBuilder.cookieJar(getCookieJar())
.connectionSpecs(Collections.singletonList(spec));
okHttpClient = clientBuilder.build();
} catch (IllegalStateException e) {
e.printStackTrace();
//initializationError = String.format(formatErrorMessage(keyChainAccessError), e.getLocalizedMessage());
initializationError = String.format(getResources().getString(keyChainAccessError), e.getLocalizedMessage());
} catch (KeyStoreException e) {
e.printStackTrace();
//initializationError = String.format(formatErrorMessage(keyChainAccessError), e.getLocalizedMessage());
initializationError = String.format(getResources().getString(keyChainAccessError), e.getLocalizedMessage());
} catch (KeyManagementException e) {
e.printStackTrace();
//initializationError = String.format(formatErrorMessage(keyChainAccessError), e.getLocalizedMessage());
initializationError = String.format(getResources().getString(keyChainAccessError), e.getLocalizedMessage());
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
//initializationError = formatErrorMessage(error_no_such_algorithm_exception_user_message);
initializationError = getResources().getString(error_no_such_algorithm_exception_user_message);
} catch (CertificateException e) {
e.printStackTrace();
initializationError = getResources().getString(certificate_error);
} catch (UnknownHostException e) {
e.printStackTrace();
initializationError = getResources().getString(server_unreachable_message);
} catch (IOException e) {
e.printStackTrace();
initializationError = getResources().getString(error_io_exception_user_message);
} catch (NoSuchProviderException e) {
e.printStackTrace();
}
}
@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> cookieStore = new HashMap<>();
@Override
public void saveFromResponse(HttpUrl url, List cookies) {
cookieStore.put(url.host(), cookies);
}
@Override
public List loadForRequest(HttpUrl url) {
List cookies = cookieStore.get(url.host());
return cookies != null ? cookies : new ArrayList();
}
};
}
private Bundle tryToRegister(Bundle task) {
Bundle result = new Bundle();
int progress = 0;
String username = User.userName();
String password = task.getString(SessionDialog.PASSWORD);
if (validUserLoginData(username, password)) {
result = register(username, password);
broadcastProgress(progress++);
} else {
if (!wellFormedPassword(password)) {
result.putBoolean(RESULT_KEY, false);
result.putString(SessionDialog.USERNAME, username);
result.putBoolean(SessionDialog.ERRORS.PASSWORD_INVALID_LENGTH.toString(), true);
}
if (!validUsername(username)) {
result.putBoolean(RESULT_KEY, false);
result.putBoolean(SessionDialog.ERRORS.USERNAME_MISSING.toString(), true);
}
}
return result;
}
private Bundle register(String username, String password) {
LeapSRPSession client = new LeapSRPSession(username, password);
byte[] salt = client.calculateNewSalt();
BigInteger password_verifier = client.calculateV(username, password, salt);
JSONObject api_result = sendNewUserDataToSRPServer(provider_api_url, username, new BigInteger(1, salt).toString(16), password_verifier.toString(16));
Bundle result = new Bundle();
if (api_result.has(ERRORS))
result = authFailedNotification(api_result, username);
else {
result.putString(SessionDialog.USERNAME, username);
result.putString(SessionDialog.PASSWORD, password);
result.putBoolean(RESULT_KEY, true);
}
return result;
}
/**
* Starts the authentication process using SRP protocol.
*
* @param task containing: username, password and api url.
* @return a bundle with a boolean value mapped to a key named RESULT_KEY, and which is true if authentication was successful.
*/
private Bundle tryToAuthenticate(Bundle task) {
Bundle result = new Bundle();
int progress = 0;
String username = User.userName();
String password = task.getString(SessionDialog.PASSWORD);
if (validUserLoginData(username, password)) {
result = authenticate(username, password);
broadcastProgress(progress++);
} else {
if (!wellFormedPassword(password)) {
result.putBoolean(RESULT_KEY, false);
result.putString(SessionDialog.USERNAME, username);
result.putBoolean(SessionDialog.ERRORS.PASSWORD_INVALID_LENGTH.toString(), true);
}
if (!validUsername(username)) {
result.putBoolean(RESULT_KEY, false);
result.putBoolean(SessionDialog.ERRORS.USERNAME_MISSING.toString(), true);
}
}
return result;
}
private Bundle authenticate(String username, String password) {
Bundle result = new Bundle();
LeapSRPSession client = new LeapSRPSession(username, password);
byte[] A = client.exponential();
JSONObject step_result = sendAToSRPServer(provider_api_url, username, new BigInteger(1, A).toString(16));
try {
String salt = step_result.getString(LeapSRPSession.SALT);
byte[] Bbytes = new BigInteger(step_result.getString("B"), 16).toByteArray();
byte[] M1 = client.response(new BigInteger(salt, 16).toByteArray(), Bbytes);
if (M1 != null) {
step_result = sendM1ToSRPServer(provider_api_url, username, M1);
setTokenIfAvailable(step_result);
byte[] M2 = new BigInteger(step_result.getString(LeapSRPSession.M2), 16).toByteArray();
if (client.verify(M2)) {
result.putBoolean(RESULT_KEY, true);
} else {
authFailedNotification(step_result, username);
}
} else {
result.putBoolean(RESULT_KEY, false);
result.putString(SessionDialog.USERNAME, username);
result.putString(getResources().getString(R.string.user_message), getResources().getString(R.string.error_srp_math_error_user_message));
}
} catch (JSONException e) {
result = authFailedNotification(step_result, username);
e.printStackTrace();
}
return result;
}
private boolean setTokenIfAvailable(JSONObject authentication_step_result) {
try {
LeapSRPSession.setToken(authentication_step_result.getString(LeapSRPSession.TOKEN));
CookieHandler.setDefault(null); // we don't need cookies anymore
} catch (JSONException e) { //
return false;
}
return true;
}
private Bundle authFailedNotification(JSONObject result, String username) {
Bundle userNotificationBundle = new Bundle();
Object baseErrorMessage = result.opt(ERRORS);
if (baseErrorMessage != null) {
if (baseErrorMessage instanceof JSONObject) {
try {
JSONObject errorMessage = result.getJSONObject(ERRORS);
String errorType = errorMessage.keys().next().toString();
String message = errorMessage.get(errorType).toString();
userNotificationBundle.putString(getResources().getString(R.string.user_message), message);
} catch (JSONException e) {
e.printStackTrace();
}
} else if (baseErrorMessage instanceof String) {
try {
String errorMessage = result.getString(ERRORS);
userNotificationBundle.putString(getResources().getString(R.string.user_message), errorMessage);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
if (!username.isEmpty())
userNotificationBundle.putString(SessionDialog.USERNAME, username);
userNotificationBundle.putBoolean(RESULT_KEY, false);
return userNotificationBundle;
}
/**
* Sets up an intent with the progress value passed as a parameter
* and sends it as a broadcast.
*
* @param progress
*/
private void broadcastProgress(int progress) {
Intent intentUpdate = new Intent();
intentUpdate.setAction(UPDATE_PROGRESSBAR);
intentUpdate.addCategory(Intent.CATEGORY_DEFAULT);
intentUpdate.putExtra(CURRENT_PROGRESS, progress);
sendBroadcast(intentUpdate);
}
/**
* Validates parameters entered by the user to log in
*
* @param username
* @param password
* @return true if both parameters are present and the entered password length is greater or equal to eight (8).
*/
private boolean validUserLoginData(String username, String password) {
return validUsername(username) && wellFormedPassword(password);
}
private boolean validUsername(String username) {
return username != null && !username.isEmpty();
}
/**
* Validates a password
*
* @param password
* @return true if the entered password length is greater or equal to eight (8).
*/
private boolean wellFormedPassword(String password) {
return password != null && password.length() >= 8;
}
/**
* Sends an HTTP POST request to the authentication server with the SRP Parameter A.
*
* @param server_url
* @param username
* @param clientA First SRP parameter sent
* @return response from authentication server
*/
private JSONObject sendAToSRPServer(String server_url, String username, String clientA) {
SrpCredentials srpCredentials = new SrpCredentials(username, clientA);
return sendToServer(server_url + "/sessions.json", "POST", srpCredentials.toString());
}
/**
* Sends an HTTP PUT request to the authentication server with the SRP Parameter M1 (or simply M).
*
* @param server_url
* @param username
* @param m1 Second SRP parameter sent
* @return response from authentication server
*/
private JSONObject sendM1ToSRPServer(String server_url, String username, byte[] m1) {
String m1json = "{\"client_auth\":\"" + new BigInteger(1, ConfigHelper.trim(m1)).toString(16)+ "\"}";
return sendToServer(server_url + "/sessions/" + username + ".json", "PUT", m1json);
}
/**
* Sends an HTTP POST request to the api server to register a new user.
*
* @param server_url
* @param username
* @param salt
* @param password_verifier
* @return response from authentication server
*/
private JSONObject sendNewUserDataToSRPServer(String server_url, String username, String salt, String password_verifier) {
return sendToServer(server_url + "/users.json", "POST", new SrpRegistrationData(username, salt, password_verifier).toString());
}
private JSONObject sendToServer(String url, String request_method, String jsonString) {
Response response;
JSONObject responseJson = new JSONObject();
RequestBody jsonBody = RequestBody.create(JSON, jsonString);
Request request = new Request.Builder()
.url(url)
.method(request_method, jsonBody)
.build();
try {
response = okHttpClient.newCall(request).execute();
InputStream inputStream = response.body().byteStream();
Scanner scanner = new Scanner(inputStream).useDelimiter("\\A");
if (scanner.hasNext()) {
String plain_response = scanner.next();
responseJson = new JSONObject(plain_response);
}
} catch (JSONException e) {
responseJson = getErrorMessageAsJson(error_json_exception_user_message);
} catch (NullPointerException npe) {
responseJson = getErrorMessageAsJson(error_json_exception_user_message);
} catch (UnknownHostException e) {
responseJson = getErrorMessageAsJson(server_unreachable_message);
} catch (MalformedURLException e) {
responseJson = getErrorMessageAsJson(malformed_url);
} catch (SocketTimeoutException e) {
responseJson = getErrorMessageAsJson(server_unreachable_message);
} catch (SSLHandshakeException e) {
responseJson = getErrorMessageAsJson(certificate_error);
} catch (ConnectException e) {
responseJson = getErrorMessageAsJson(service_is_down_error);
} catch (UnknownServiceException e) {
//unable to find acceptable protocols - tlsv1.2 not enabled?
responseJson = getErrorMessageAsJson(error_no_such_algorithm_exception_user_message);
} catch (IOException e) {
responseJson = getErrorMessageAsJson(error_io_exception_user_message);
}
return responseJson;
}
/**
* 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.
*/
private Bundle setUpProvider(Bundle task) {
int progress = 0;
Bundle current_download = new Bundle();
if (task != null) {
last_danger_on = task.containsKey(ProviderItem.DANGER_ON) && task.getBoolean(ProviderItem.DANGER_ON);
last_provider_main_url = task.containsKey(Provider.MAIN_URL) ?
task.getString(Provider.MAIN_URL) :
"";
provider_ca_cert_fingerprint = task.containsKey(Provider.CA_CERT_FINGERPRINT) ?
task.getString(Provider.CA_CERT_FINGERPRINT) :
"";
CA_CERT_DOWNLOADED = PROVIDER_JSON_DOWNLOADED = EIP_SERVICE_JSON_DOWNLOADED = false;
go_ahead = true;
}
if (!PROVIDER_JSON_DOWNLOADED)
current_download = getAndSetProviderJson(last_provider_main_url, last_danger_on, provider_ca_cert_fingerprint);
if (PROVIDER_JSON_DOWNLOADED || (current_download.containsKey(RESULT_KEY) && current_download.getBoolean(RESULT_KEY))) {
broadcastProgress(progress++);
PROVIDER_JSON_DOWNLOADED = true;
current_download = downloadCACert(last_danger_on);
if (CA_CERT_DOWNLOADED || (current_download.containsKey(RESULT_KEY) && current_download.getBoolean(RESULT_KEY))) {
broadcastProgress(progress++);
CA_CERT_DOWNLOADED = true;
current_download = getAndSetEipServiceJson();
if (current_download.containsKey(RESULT_KEY) && current_download.getBoolean(RESULT_KEY)) {
broadcastProgress(progress++);
EIP_SERVICE_JSON_DOWNLOADED = true;
}
}
}
return current_download;
}
private Bundle downloadCACert(boolean danger_on) {
Bundle result = new Bundle();
try {
JSONObject provider_json = new JSONObject(preferences.getString(Provider.KEY, ""));
String ca_cert_url = provider_json.getString(Provider.CA_CERT_URI);
String cert_string = downloadWithCommercialCA(ca_cert_url, danger_on);
if (validCertificate(cert_string) && go_ahead) {
preferences.edit().putString(Provider.CA_CERT, cert_string).commit();
result.putBoolean(RESULT_KEY, true);
} else {
String reason_to_fail = pickErrorMessage(cert_string);
result.putString(ERRORS, reason_to_fail);
result.putBoolean(RESULT_KEY, false);
}
} catch (JSONException e) {
String reason_to_fail = formatErrorMessage(malformed_url);
result.putString(ERRORS, reason_to_fail);
result.putBoolean(RESULT_KEY, false);
}
return result;
}
public static boolean caCertDownloaded() {
return CA_CERT_DOWNLOADED;
}
private boolean validCertificate(String cert_string) {
boolean result = false;
if (!ConfigHelper.checkErroneousDownload(cert_string)) {
X509Certificate certificate = ConfigHelper.parseX509CertificateFromString(cert_string);
try {
if (certificate != null) {
JSONObject provider_json = new JSONObject(preferences.getString(Provider.KEY, ""));
String fingerprint = provider_json.getString(Provider.CA_CERT_FINGERPRINT);
String encoding = fingerprint.split(":")[0];
String expected_fingerprint = fingerprint.split(":")[1];
String real_fingerprint = base64toHex(Base64.encodeToString(
MessageDigest.getInstance(encoding).digest(certificate.getEncoded()),
Base64.DEFAULT));
result = real_fingerprint.trim().equalsIgnoreCase(expected_fingerprint.trim());
} else
result = false;
} catch (JSONException e) {
result = false;
} catch (NoSuchAlgorithmException e) {
result = false;
} catch (CertificateEncodingException e) {
result = false;
}
}
return result;
}
private String base64toHex(String base64_input) {
byte[] byteArray = Base64.decode(base64_input, Base64.DEFAULT);
int readBytes = byteArray.length;
StringBuffer hexData = new StringBuffer();
int onebyte;
for (int i = 0; i < readBytes; i++) {
onebyte = ((0x000000ff & byteArray[i]) | 0xffffff00);
hexData.append(Integer.toHexString(onebyte).substring(6));
}
return hexData.toString();
}
private Bundle getAndSetProviderJson(String provider_main_url, boolean danger_on, String provider_ca_cert_fingerprint) {
Bundle result = new Bundle();
if (go_ahead) {
String provider_dot_json_string;
if(provider_ca_cert_fingerprint.isEmpty())
provider_dot_json_string = downloadWithCommercialCA(provider_main_url + "/provider.json", danger_on);
else
provider_dot_json_string = downloadWithCommercialCA(provider_main_url + "/provider.json", danger_on, provider_ca_cert_fingerprint);
try {
JSONObject provider_json = new JSONObject(provider_dot_json_string);
provider_api_url = provider_json.getString(Provider.API_URL) + "/" + provider_json.getString(Provider.API_VERSION);
String name = provider_json.getString(Provider.NAME);
//TODO setProviderName(name);
preferences.edit().putString(Provider.KEY, provider_json.toString()).commit();
preferences.edit().putBoolean(Constants.ALLOWED_ANON, provider_json.getJSONObject(Provider.SERVICE).getBoolean(Constants.ALLOWED_ANON)).commit();
preferences.edit().putBoolean(Constants.ALLOWED_REGISTERED, provider_json.getJSONObject(Provider.SERVICE).getBoolean(Constants.ALLOWED_REGISTERED)).commit();
result.putBoolean(RESULT_KEY, true);
} catch (JSONException e) {
//TODO Error message should be contained in that provider_dot_json_string
String reason_to_fail = pickErrorMessage(provider_dot_json_string);
result.putString(ERRORS, reason_to_fail);
result.putBoolean(RESULT_KEY, false);
}
}
return result;
}
private 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, true);
JSONObject eip_service_json = new JSONObject(eip_service_json_string);
eip_service_json.getInt(Provider.API_RETURN_SERIAL);
preferences.edit().putString(Constants.KEY, eip_service_json.toString()).commit();
result.putBoolean(RESULT_KEY, true);
} catch (JSONException e) {
String reason_to_fail = pickErrorMessage(eip_service_json_string);
result.putString(ERRORS, reason_to_fail);
result.putBoolean(RESULT_KEY, false);
}
}
return result;
}
/**
* Interprets the error message as a JSON object and extract the "errors" keyword pair.
* If the error message is not a JSON object, then it is returned untouched.
*
* @param string_json_error_message
* @return final error message
*/
private String pickErrorMessage(String string_json_error_message) {
String error_message = "";
try {
JSONObject json_error_message = new JSONObject(string_json_error_message);
error_message = json_error_message.getString(ERRORS);
} catch (JSONException e) {
// TODO Auto-generated catch block
error_message = string_json_error_message;
}
return error_message;
}
private String downloadWithCommercialCA(String url_string, boolean danger_on, String ca_cert_fingerprint) {
String result = "";
int seconds_of_timeout = 2;
String[] pins = new String[] {ca_cert_fingerprint};
try {
URL url = new URL(url_string);
HttpsURLConnection connection = PinningHelper.getPinnedHttpsURLConnection(getApplicationContext(), pins, url);
connection.setConnectTimeout(seconds_of_timeout * 1000);
if (!LeapSRPSession.getToken().isEmpty())
connection.addRequestProperty(LeapSRPSession.AUTHORIZATION_HEADER, "Token token = " + LeapSRPSession.getToken());
result = new Scanner(connection.getInputStream()).useDelimiter("\\A").next();
} catch (IOException e) {
if(e instanceof SSLHandshakeException) {
result = danger_on ? downloadWithoutCA(url_string) :
formatErrorMessage(R.string.error_security_pinnedcertificate);
} else
result = formatErrorMessage(error_io_exception_user_message);
}
return result;
}
/**
* Tries to download the contents of the provided url using commercially validated CA certificate from chosen provider.
*
* 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 json_file_content = "";
URL provider_url = null;
int seconds_of_timeout = 2;
try {
provider_url = new URL(string_url);
URLConnection url_connection = provider_url.openConnection();
url_connection.setConnectTimeout(seconds_of_timeout * 1000);
if (!LeapSRPSession.getToken().isEmpty())
url_connection.addRequestProperty(LeapSRPSession.AUTHORIZATION_HEADER, "Token token = " + LeapSRPSession.getToken());
json_file_content = new Scanner(url_connection.getInputStream()).useDelimiter("\\A").next();
} catch (MalformedURLException e) {
json_file_content = formatErrorMessage(malformed_url);
} catch (SocketTimeoutException e) {
json_file_content = formatErrorMessage(server_unreachable_message);
} catch (SSLHandshakeException e) {
if (provider_url != null) {
json_file_content = downloadWithProviderCA(string_url, danger_on);
} else {
json_file_content = formatErrorMessage(certificate_error);
}
} catch (ConnectException e) {
json_file_content = formatErrorMessage(service_is_down_error);
} catch (FileNotFoundException e) {
json_file_content = formatErrorMessage(malformed_url);
} catch (Exception e) {
if (provider_url != null && danger_on) {
json_file_content = downloadWithProviderCA(string_url, danger_on);
}
}
return json_file_content;
}
/**
* Tries to download the contents of the provided url using not commercially validated CA certificate from chosen provider.
*
* @param url_string as a string
* @param danger_on true to download CA certificate in case it has not been downloaded.
* @return an empty string if it fails, the url content if not.
*/
//FIXME: refactor and use okHttpClient instead!
private String downloadWithProviderCA(String url_string, boolean danger_on) {
String json_file_content = "";
try {
URL url = new URL(url_string);
// Tell the URLConnection to use a SocketFactory from our SSLContext
HttpsURLConnection urlConnection =
(HttpsURLConnection) url.openConnection();
urlConnection.setSSLSocketFactory(getProviderSSLSocketFactory());
if (!LeapSRPSession.getToken().isEmpty())
urlConnection.addRequestProperty(LeapSRPSession.AUTHORIZATION_HEADER, "Token token=" + LeapSRPSession.getToken());
json_file_content = new Scanner(urlConnection.getInputStream()).useDelimiter("\\A").next();
} catch (CertificateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
json_file_content = formatErrorMessage(server_unreachable_message);
} catch (IOException e) {
// The downloaded certificate doesn't validate our https connection.
if (danger_on) {
json_file_content = downloadWithoutCA(url_string);
} else {
json_file_content = formatErrorMessage(certificate_error);
}
} catch (KeyStoreException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (KeyManagementException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchElementException e) {
e.printStackTrace();
json_file_content = formatErrorMessage(server_unreachable_message);
}
return json_file_content;
}
@Deprecated
private javax.net.ssl.SSLSocketFactory getProviderSSLSocketFactory() throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException, KeyManagementException {
String provider_cert_string = preferences.getString(Provider.CA_CERT, "");
java.security.cert.Certificate provider_certificate = ConfigHelper.parseX509CertificateFromString(provider_cert_string);
// Create a KeyStore containing our trusted CAs
String keyStoreType = KeyStore.getDefaultType();
KeyStore keyStore = KeyStore.getInstance(keyStoreType);
keyStore.load(null, null);
keyStore.setCertificateEntry("provider_ca_certificate", provider_certificate);
// Create a TrustManager that trusts the CAs in our KeyStore
String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
tmf.init(keyStore);
// Create an SSLContext that uses our TrustManager
SSLContext context = SSLContext.getInstance("TLS");
context.init(null, tmf.getTrustManagers(), null);
return context.getSocketFactory();
}
private void initSSLSocketFactory(OkHttpClient.Builder builder) throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException, KeyManagementException, IllegalStateException, NoSuchProviderException {
TLSCompatSocketFactory sslCompatFactory = new TLSCompatSocketFactory(preferences.getString(Provider.CA_CERT, ""));
sslCompatFactory.initSSLSocketFactory(builder);
}
/**
* Downloads the string that's in the url with any certificate.
*/
// FIXME: refactor and use okHttpClient instead!
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;
}
/**
* Logs out from the api url retrieved from the task.
*
* @return true if there were no exceptions
*/
//FIXME: refactor and use okHttpClient instead!
private boolean logOut() {
String delete_url = provider_api_url + "/logout";
HttpsURLConnection urlConnection = null;
int responseCode = 0;
int progress = 0;
try {
urlConnection = (HttpsURLConnection) new URL(delete_url).openConnection();
urlConnection.setRequestMethod("DELETE");
urlConnection.setSSLSocketFactory(getProviderSSLSocketFactory());
responseCode = urlConnection.getResponseCode();
broadcastProgress(progress++);
LeapSRPSession.setToken("");
} catch (IndexOutOfBoundsException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
} catch (IOException e) {
// TODO Auto-generated catch block
try {
if (urlConnection != null) {
responseCode = urlConnection.getResponseCode();
if (responseCode == 401) {
broadcastProgress(progress++);
LeapSRPSession.setToken("");
return true;
}
}
} catch (IOException e1) {
e1.printStackTrace();
}
e.printStackTrace();
return false;
} catch (KeyManagementException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (KeyStoreException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (CertificateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
/**
* Downloads a new OpenVPN certificate, attaching authenticated cookie for authenticated certificate.
*
* @return true if certificate was downloaded correctly, false if provider.json or danger_on flag are not present in SharedPreferences, or if the certificate url could not be parsed as a URI, or if there was an SSL error.
*/
private 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.CERTIFICATE);
boolean danger_on = preferences.getBoolean(ProviderItem.DANGER_ON, false);
String cert_string = downloadWithProviderCA(new_cert_string_url.toString(), danger_on);
if (cert_string.isEmpty() || ConfigHelper.checkErroneousDownload(cert_string))
return false;
else
return loadCertificate(cert_string);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
}
private boolean loadCertificate(String cert_string) {
try {
// API returns concatenated cert & key. Split them for OpenVPN options
String certificateString = null, keyString = null;
String[] certAndKey = cert_string.split("(?<=-\n)");
for (int i = 0; i < certAndKey.length - 1; i++) {
if (certAndKey[i].contains("KEY")) {
keyString = certAndKey[i++] + certAndKey[i];
} else if (certAndKey[i].contains("CERTIFICATE")) {
certificateString = certAndKey[i++] + certAndKey[i];
}
}
RSAPrivateKey keyCert = ConfigHelper.parseRsaKeyFromString(keyString);
keyString = Base64.encodeToString(keyCert.getEncoded(), Base64.DEFAULT);
preferences.edit().putString(Constants.PRIVATE_KEY, "-----BEGIN RSA PRIVATE KEY-----\n" + keyString + "-----END RSA PRIVATE KEY-----").commit();
X509Certificate certCert = ConfigHelper.parseX509CertificateFromString(certificateString);
certificateString = Base64.encodeToString(certCert.getEncoded(), Base64.DEFAULT);
preferences.edit().putString(Constants.CERTIFICATE, "-----BEGIN CERTIFICATE-----\n" + certificateString + "-----END CERTIFICATE-----").commit();
return true;
} catch (CertificateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
}
}