diff options
Diffstat (limited to 'app/src/insecure/java/se/leap/bitmaskclient/ProviderAPI.java')
| -rw-r--r-- | app/src/insecure/java/se/leap/bitmaskclient/ProviderAPI.java | 1012 |
1 files changed, 1012 insertions, 0 deletions
diff --git a/app/src/insecure/java/se/leap/bitmaskclient/ProviderAPI.java b/app/src/insecure/java/se/leap/bitmaskclient/ProviderAPI.java new file mode 100644 index 00000000..2d7e13fe --- /dev/null +++ b/app/src/insecure/java/se/leap/bitmaskclient/ProviderAPI.java @@ -0,0 +1,1012 @@ +/** + * 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; + +import android.app.*; +import android.content.*; +import android.content.res.*; +import android.os.*; +import android.util.*; + +import org.apache.http.client.*; +import org.json.*; +import org.thoughtcrime.ssl.pinning.util.*; + +import java.io.*; +import java.math.*; +import java.net.*; +import java.security.*; +import java.security.cert.*; +import java.security.interfaces.*; +import java.util.*; + +import javax.net.ssl.*; + +import se.leap.bitmaskclient.ProviderListContent.*; +import se.leap.bitmaskclient.eip.*; +import se.leap.bitmaskclient.userstatus.SessionDialog; +import se.leap.bitmaskclient.userstatus.User; +import se.leap.bitmaskclient.userstatus.UserStatus; + +/** + * Implements HTTP api methods used to manage communications with the provider server. + * <p/> + * 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; + + 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; + } + + public ProviderAPI() { + super(TAG); + } + + @Override + public void onCreate() { + super.onCreate(); + + + preferences = getSharedPreferences(Dashboard.SHARED_PREFERENCES, MODE_PRIVATE); + resources = getResources(); + CookieHandler.setDefault(new CookieManager(null, CookiePolicy.ACCEPT_ORIGINAL_SERVER)); + } + + public static String lastProviderMainUrl() { + return last_provider_main_url; + } + + public static boolean lastDangerOn() { + return last_danger_on; + } + + private String formatErrorMessage(final int toast_string_id) { + return "{ \"" + ERRORS + "\" : \"" + getResources().getString(toast_string_id) + "\" }"; + } + + @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, "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 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 user_notification_bundle = new Bundle(); + try { + JSONObject error_message = result.getJSONObject(ERRORS); + String error_type = error_message.keys().next().toString(); + String message = error_message.get(error_type).toString(); + user_notification_bundle.putString(getResources().getString(R.string.user_message), message); + } catch (JSONException e) { + } + + if (!username.isEmpty()) + user_notification_bundle.putString(SessionDialog.USERNAME, username); + user_notification_bundle.putBoolean(RESULT_KEY, false); + + return user_notification_bundle; + } + + /** + * 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) { + Map<String, String> parameters = new HashMap<String, String>(); + parameters.put("login", username); + parameters.put("A", clientA); + return sendToServer(server_url + "/sessions.json", "POST", parameters); + } + + /** + * 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) { + Map<String, String> parameters = new HashMap<String, String>(); + parameters.put("client_auth", new BigInteger(1, ConfigHelper.trim(m1)).toString(16)); + + return sendToServer(server_url + "/sessions/" + username + ".json", "PUT", parameters); + } + + /** + * 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) { + Map<String, String> parameters = new HashMap<String, String>(); + parameters.put("user[login]", username); + parameters.put("user[password_salt]", salt); + parameters.put("user[password_verifier]", password_verifier); + return sendToServer(server_url + "/users.json", "POST", parameters); + } + + /** + * Executes an HTTP request expecting a JSON response. + * + * @param url + * @param request_method + * @param parameters + * @return response from authentication server + */ + private JSONObject sendToServer(String url, String request_method, Map<String, String> parameters) { + JSONObject json_response; + HttpsURLConnection urlConnection = null; + try { + InputStream is = null; + urlConnection = (HttpsURLConnection) new URL(url).openConnection(); + urlConnection.setRequestMethod(request_method); + String locale = Locale.getDefault().getLanguage() + Locale.getDefault().getCountry(); + urlConnection.setRequestProperty("Accept-Language", locale); + urlConnection.setChunkedStreamingMode(0); + urlConnection.setSSLSocketFactory(getProviderSSLSocketFactory()); + + DataOutputStream writer = new DataOutputStream(urlConnection.getOutputStream()); + writer.writeBytes(formatHttpParameters(parameters)); + writer.close(); + + is = urlConnection.getInputStream(); + String plain_response = new Scanner(is).useDelimiter("\\A").next(); + json_response = new JSONObject(plain_response); + } catch (ClientProtocolException e) { + json_response = getErrorMessage(urlConnection); + e.printStackTrace(); + } catch (IOException e) { + json_response = getErrorMessage(urlConnection); + e.printStackTrace(); + } catch (JSONException e) { + json_response = getErrorMessage(urlConnection); + e.printStackTrace(); + } catch (NoSuchAlgorithmException e) { + json_response = getErrorMessage(urlConnection); + e.printStackTrace(); + } catch (KeyManagementException e) { + json_response = getErrorMessage(urlConnection); + e.printStackTrace(); + } catch (KeyStoreException e) { + json_response = getErrorMessage(urlConnection); + e.printStackTrace(); + } catch (CertificateException e) { + json_response = getErrorMessage(urlConnection); + e.printStackTrace(); + } + + return json_response; + } + + private JSONObject getErrorMessage(HttpsURLConnection urlConnection) { + JSONObject error_message = new JSONObject(); + if (urlConnection != null) { + InputStream error_stream = urlConnection.getErrorStream(); + if (error_stream != null) { + String error_response = new Scanner(error_stream).useDelimiter("\\A").next(); + try { + error_message = new JSONObject(error_response); + } catch (JSONException e) { + e.printStackTrace(); + } + urlConnection.disconnect(); + } + } + return error_message; + } + + private String formatHttpParameters(Map<String, String> parameters) throws UnsupportedEncodingException { + StringBuilder result = new StringBuilder(); + boolean first = true; + + Iterator<String> parameter_iterator = parameters.keySet().iterator(); + while (parameter_iterator.hasNext()) { + if (first) + first = false; + else + result.append("&&"); + + String key = parameter_iterator.next(); + String value = parameters.get(key); + + result.append(URLEncoder.encode(key, "UTF-8")); + result.append("="); + result.append(URLEncoder.encode(value, "UTF-8")); + } + + return result.toString(); + } + + + /** + * 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(R.string.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(R.string.error_io_exception_user_message); + } + + 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 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(R.string.malformed_url); + } catch (SocketTimeoutException e) { + json_file_content = formatErrorMessage(R.string.server_unreachable_message); + } catch (SSLHandshakeException e) { + if (provider_url != null) { + json_file_content = downloadWithProviderCA(string_url, danger_on); + } else { + json_file_content = formatErrorMessage(R.string.certificate_error); + } + } catch (ConnectException e) { + json_file_content = formatErrorMessage(R.string.service_is_down_error); + } catch (FileNotFoundException e) { + json_file_content = formatErrorMessage(R.string.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. + */ + 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(R.string.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(R.string.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(R.string.server_unreachable_message); + } + return json_file_content; + } + + 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(); + } + + /** + * Downloads the string that's in the url with any certificate. + */ + 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(R.string.malformed_url); + } catch (IOException e) { + // The downloaded certificate doesn't validate our https connection. + e.printStackTrace(); + string = formatErrorMessage(R.string.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 + */ + 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 (ClientProtocolException e) { + // TODO Auto-generated catch block + e.printStackTrace(); + return false; + } 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; + } + } +} |