diff options
Diffstat (limited to 'app/src/main/java/se/leap')
| -rw-r--r-- | app/src/main/java/se/leap/bitmaskclient/ProviderApiBase.java | 817 |
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; + } + } +} |