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authorcyBerta <cyberta@riseup.net>2017-10-31 15:58:07 +0100
committercyBerta <cyberta@riseup.net>2017-10-31 15:58:07 +0100
commit8158397299dc29e6ffa1018b082c41aad37f18d6 (patch)
tree5a3dd281aceba598ed5bcb9d571cb05c158eaf22 /app/src/main/java/se
parent1f133c139e4f9f26a265b26cbb6f37c2556a5fcc (diff)
#8757 new ProviderApiBase includes commonly used code between different implementations of ProviderAPI
Diffstat (limited to 'app/src/main/java/se')
-rw-r--r--app/src/main/java/se/leap/bitmaskclient/ProviderApiBase.java817
1 files changed, 817 insertions, 0 deletions
diff --git a/app/src/main/java/se/leap/bitmaskclient/ProviderApiBase.java b/app/src/main/java/se/leap/bitmaskclient/ProviderApiBase.java
new file mode 100644
index 00000000..caa48231
--- /dev/null
+++ b/app/src/main/java/se/leap/bitmaskclient/ProviderApiBase.java
@@ -0,0 +1,817 @@
+/**
+ * Copyright (c) 2017 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.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 android.util.Pair;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.math.BigInteger;
+import java.net.ConnectException;
+import java.net.MalformedURLException;
+import java.net.SocketTimeoutException;
+import java.net.UnknownHostException;
+import java.net.UnknownServiceException;
+import java.security.KeyManagementException;
+import java.security.KeyStoreException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+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.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Scanner;
+
+import javax.net.ssl.SSLHandshakeException;
+
+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.eip.Constants;
+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.
+ * The implemented methods are commonly used by insecure's and production's flavor of ProviderAPI.
+ * <p/>
+ * It's an IntentService because it downloads data from the Internet, so it operates in the background.
+ *
+ * @author parmegv
+ * @author MeanderingCode
+ * @author cyberta
+ */
+
+public abstract class ProviderApiBase 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;
+
+ public static boolean
+ CA_CERT_DOWNLOADED = false,
+ PROVIDER_JSON_DOWNLOADED = false,
+ EIP_SERVICE_JSON_DOWNLOADED = false;
+
+ protected static String last_provider_main_url;
+ protected static boolean go_ahead = true;
+ protected static SharedPreferences preferences;
+ protected static String provider_api_url;
+ protected static String provider_ca_cert_fingerprint;
+ protected Resources resources;
+
+ public static void stop() {
+ go_ahead = false;
+ }
+
+ private final MediaType JSON
+ = MediaType.parse("application/json; charset=utf-8");
+
+ public ProviderApiBase() {
+ super(TAG);
+ }
+
+ @Override
+ public void onCreate() {
+ super.onCreate();
+
+ preferences = getSharedPreferences(Dashboard.SHARED_PREFERENCES, MODE_PRIVATE);
+ resources = getResources();
+ }
+
+ public static String lastProviderMainUrl() {
+ return last_provider_main_url;
+ }
+
+ @Override
+ protected void onHandleIntent(Intent command) {
+ final ResultReceiver receiver = command.getParcelableExtra(RECEIVER_KEY);
+ 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, ""));
+ 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 (go_ahead) {
+ 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);
+ 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);
+ }
+ }
+ }
+
+ protected String formatErrorMessage(final int toastStringId) {
+ return formatErrorMessage(getResources().getString(toastStringId));
+ }
+
+ private String formatErrorMessage(String errorMessage) {
+ return "{ \"" + ERRORS + "\" : \"" + errorMessage + "\" }";
+ }
+
+ private JSONObject getErrorMessageAsJson(final int toastStringId) {
+ try {
+ return new JSONObject(formatErrorMessage(toastStringId));
+ } catch (JSONException e) {
+ e.printStackTrace();
+ return new JSONObject();
+ }
+ }
+
+ private JSONObject getErrorMessageAsJson(String message) {
+ try {
+ return new JSONObject(formatErrorMessage(message));
+ } catch (JSONException e) {
+ e.printStackTrace();
+ return new JSONObject();
+ }
+ }
+ private OkHttpClient initHttpClient(JSONObject initError, boolean isSelfSigned) {
+ try {
+ TLSCompatSocketFactory sslCompatFactory;
+ ConnectionSpec spec = getConnectionSpec();
+ OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder();
+ if (isSelfSigned) {
+ sslCompatFactory = new TLSCompatSocketFactory(preferences.getString(Provider.CA_CERT, ""));
+
+ } else {
+ sslCompatFactory = new TLSCompatSocketFactory();
+ }
+ sslCompatFactory.initSSLSocketFactory(clientBuilder);
+ clientBuilder.cookieJar(getCookieJar())
+ .connectionSpecs(Collections.singletonList(spec));
+ return clientBuilder.build();
+ } catch (IllegalStateException e) {
+ e.printStackTrace();
+ initError = getErrorMessageAsJson(String.format(resources.getString(keyChainAccessError), e.getLocalizedMessage()));
+ } catch (KeyStoreException e) {
+ e.printStackTrace();
+ initError = getErrorMessageAsJson(String.format(resources.getString(keyChainAccessError), e.getLocalizedMessage()));
+ } catch (KeyManagementException e) {
+ e.printStackTrace();
+ initError = getErrorMessageAsJson(String.format(resources.getString(keyChainAccessError), e.getLocalizedMessage()));
+ } catch (NoSuchAlgorithmException e) {
+ e.printStackTrace();
+ initError = getErrorMessageAsJson(resources.getString(error_no_such_algorithm_exception_user_message));
+ } catch (CertificateException e) {
+ e.printStackTrace();
+ initError = getErrorMessageAsJson(resources.getString(certificate_error));
+ } catch (UnknownHostException e) {
+ e.printStackTrace();
+ initError = getErrorMessageAsJson(resources.getString(server_unreachable_message));
+ } catch (IOException e) {
+ e.printStackTrace();
+ initError = getErrorMessageAsJson(resources.getString(error_io_exception_user_message));
+ } catch (NoSuchProviderException e) {
+ e.printStackTrace();
+ initError = getErrorMessageAsJson(resources.getString(error_no_such_algorithm_exception_user_message));
+ }
+ return null;
+ }
+
+ protected OkHttpClient initCommercialCAHttpClient(JSONObject initError) {
+ return initHttpClient(initError, false);
+ }
+
+ protected OkHttpClient initSelfSignedCAHttpClient(JSONObject initError) {
+ return initHttpClient(initError, true);
+ }
+
+ @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 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) {
+ JSONObject stepResult = null;
+ OkHttpClient okHttpClient = initSelfSignedCAHttpClient(stepResult);
+ if (okHttpClient == null) {
+ return authFailedNotification(stepResult, username);
+ }
+
+ 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), okHttpClient);
+
+ 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();
+ JSONObject stepResult = new JSONObject();
+ OkHttpClient okHttpClient = initSelfSignedCAHttpClient(stepResult);
+ if (okHttpClient == null) {
+ return authFailedNotification(stepResult, username);
+ }
+
+ LeapSRPSession client = new LeapSRPSession(username, password);
+ byte[] A = client.exponential();
+
+ JSONObject step_result = sendAToSRPServer(provider_api_url, username, new BigInteger(1, A).toString(16), okHttpClient);
+ 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, okHttpClient);
+ 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(resources.getString(R.string.user_message), resources.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));
+ } 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(resources.getString(R.string.user_message), message);
+ } catch (JSONException e) {
+ e.printStackTrace();
+ }
+ } else if (baseErrorMessage instanceof String) {
+ try {
+ String errorMessage = result.getString(ERRORS);
+ userNotificationBundle.putString(resources.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
+ */
+ protected 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
+ * @param okHttpClient
+ * @return response from authentication server
+ */
+ private JSONObject sendAToSRPServer(String server_url, String username, String clientA, OkHttpClient okHttpClient) {
+ SrpCredentials srpCredentials = new SrpCredentials(username, clientA);
+ return sendToServer(server_url + "/sessions.json", "POST", srpCredentials.toString(), okHttpClient);
+ }
+
+ /**
+ * 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
+ * @param okHttpClient
+ * @return response from authentication server
+ */
+ private JSONObject sendM1ToSRPServer(String server_url, String username, byte[] m1, OkHttpClient okHttpClient) {
+ String m1json = "{\"client_auth\":\"" + new BigInteger(1, ConfigHelper.trim(m1)).toString(16)+ "\"}";
+ return sendToServer(server_url + "/sessions/" + username + ".json", "PUT", m1json, okHttpClient);
+ }
+
+ /**
+ * Sends an HTTP POST request to the api server to register a new user.
+ *
+ * @param server_url
+ * @param username
+ * @param salt
+ * @param password_verifier
+ * @param okHttpClient
+ * @return response from authentication server
+ */
+ private JSONObject sendNewUserDataToSRPServer(String server_url, String username, String salt, String password_verifier, OkHttpClient okHttpClient) {
+ return sendToServer(server_url + "/users.json", "POST", new SrpRegistrationData(username, salt, password_verifier).toString(), okHttpClient);
+ }
+
+ /**
+ * Executes an HTTP request expecting a JSON response.
+ *
+ * @param url
+ * @param request_method
+ * @return response from authentication server
+ */
+ private JSONObject sendToServer(String url, String request_method, String jsonString, OkHttpClient okHttpClient) {
+ return requestJsonFromServer(url, request_method, jsonString, null, okHttpClient);
+ }
+
+ protected String sendGetStringToServer(String url, List<Pair<String, String>> headerArgs, OkHttpClient okHttpClient) {
+ return requestStringFromServer(url, "GET", null, headerArgs, okHttpClient);
+ }
+
+
+
+ private JSONObject requestJsonFromServer(String url, String request_method, String jsonString, List<Pair<String, String>> headerArgs, @NonNull OkHttpClient okHttpClient) {
+ JSONObject responseJson;
+ String plain_response = requestStringFromServer(url, request_method, jsonString, headerArgs, okHttpClient);
+
+ try {
+ responseJson = new JSONObject(plain_response);
+ } catch (JSONException e) {
+ e.printStackTrace();
+ responseJson = getErrorMessageAsJson(error_json_exception_user_message);
+ }
+ return responseJson;
+
+ }
+
+ private String requestStringFromServer(String url, String request_method, String jsonString, List<Pair<String, String>> headerArgs, @NonNull OkHttpClient okHttpClient) {
+ Response response;
+ String plainResponseBody = null;
+
+ RequestBody jsonBody = jsonString != null ? RequestBody.create(JSON, jsonString) : null;
+ Request.Builder requestBuilder = new Request.Builder()
+ .url(url)
+ .method(request_method, jsonBody);
+ if (headerArgs != null) {
+ for (Pair<String, String> keyValPair : headerArgs) {
+ requestBuilder.addHeader(keyValPair.first, keyValPair.second);
+ }
+ }
+ //TODO: move to getHeaderArgs()?
+ String locale = Locale.getDefault().getLanguage() + Locale.getDefault().getCountry();
+ requestBuilder.addHeader("Accept-Language", locale);
+ Request request = requestBuilder.build();
+
+ try {
+ response = okHttpClient.newCall(request).execute();
+
+ InputStream inputStream = response.body().byteStream();
+ Scanner scanner = new Scanner(inputStream).useDelimiter("\\A");
+ if (scanner.hasNext()) {
+ plainResponseBody = scanner.next();
+ }
+
+ } catch (NullPointerException npe) {
+ plainResponseBody = formatErrorMessage(error_json_exception_user_message);
+ } catch (UnknownHostException e) {
+ plainResponseBody = formatErrorMessage(server_unreachable_message);
+ } catch (MalformedURLException e) {
+ plainResponseBody = formatErrorMessage(malformed_url);
+ } catch (SocketTimeoutException e) {
+ plainResponseBody = formatErrorMessage(server_unreachable_message);
+ } catch (SSLHandshakeException e) {
+ plainResponseBody = formatErrorMessage(certificate_error);
+ } catch (ConnectException e) {
+ plainResponseBody = formatErrorMessage(service_is_down_error);
+ } catch (IllegalArgumentException e) {
+ plainResponseBody = formatErrorMessage(error_no_such_algorithm_exception_user_message);
+ } catch (UnknownServiceException e) {
+ //unable to find acceptable protocols - tlsv1.2 not enabled?
+ plainResponseBody = formatErrorMessage(error_no_such_algorithm_exception_user_message);
+ } catch (IOException e) {
+ plainResponseBody = formatErrorMessage(error_io_exception_user_message);
+ }
+
+ return plainResponseBody;
+ }
+
+ /**
+ * 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.
+ */
+ protected abstract Bundle setUpProvider(Bundle task);
+
+ /**
+ * 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.
+ */
+ protected abstract Bundle getAndSetEipServiceJson();
+
+ /**
+ * 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.
+ */
+ protected abstract boolean updateVpnCertificate();
+
+
+ protected static boolean caCertDownloaded() {
+ return CA_CERT_DOWNLOADED;
+ }
+
+ protected 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();
+ }
+
+ /**
+ * 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
+ */
+ protected 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;
+ }
+
+ @NonNull
+ protected List<Pair<String, String>> getAuthorizationHeader() {
+ List<Pair<String, String>> headerArgs = new ArrayList<>();
+ if (!LeapSRPSession.getToken().isEmpty()) {
+ Pair<String, String> authorizationHeaderPair = new Pair<>(LeapSRPSession.AUTHORIZATION_HEADER, "Token token=" + LeapSRPSession.getToken());
+ headerArgs.add(authorizationHeaderPair);
+ }
+ return headerArgs;
+ }
+
+ private boolean logOut() {
+ OkHttpClient okHttpClient = initSelfSignedCAHttpClient(new JSONObject());
+ if (okHttpClient == null) {
+ return false;
+ }
+
+ String deleteUrl = provider_api_url + "/logout";
+ int progress = 0;
+
+ Request.Builder requestBuilder = new Request.Builder()
+ .url(deleteUrl)
+ .delete();
+ Request request = requestBuilder.build();
+
+ try {
+ Response response = okHttpClient.newCall(request).execute();
+ // v---- was already not authorized
+ if (response.isSuccessful() || response.code() == 401) {
+ broadcastProgress(progress++);
+ LeapSRPSession.setToken("");
+ }
+
+ } catch (IOException e) {
+ return false;
+ }
+ return true;
+ }
+
+ //FIXME: don't save private keys in shared preferences! use the keystore
+ protected 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 key = ConfigHelper.parseRsaKeyFromString(keyString);
+ keyString = Base64.encodeToString(key.getEncoded(), Base64.DEFAULT);
+ preferences.edit().putString(Constants.PRIVATE_KEY, "-----BEGIN RSA PRIVATE KEY-----\n" + keyString + "-----END RSA PRIVATE KEY-----").commit();
+
+ X509Certificate certificate = ConfigHelper.parseX509CertificateFromString(certificateString);
+ certificateString = Base64.encodeToString(certificate.getEncoded(), Base64.DEFAULT);
+ preferences.edit().putString(Constants.VPN_CERTIFICATE, "-----BEGIN CERTIFICATE-----\n" + certificateString + "-----END CERTIFICATE-----").commit();
+ return true;
+ } catch (CertificateException e) {
+ // TODO Auto-generated catch block
+ e.printStackTrace();
+ return false;
+ }
+ }
+}