diff options
Diffstat (limited to 'src/se/leap/leapclient/ProviderAPI.java')
| -rw-r--r-- | src/se/leap/leapclient/ProviderAPI.java | 733 |
1 files changed, 733 insertions, 0 deletions
diff --git a/src/se/leap/leapclient/ProviderAPI.java b/src/se/leap/leapclient/ProviderAPI.java new file mode 100644 index 00000000..944a0e7f --- /dev/null +++ b/src/se/leap/leapclient/ProviderAPI.java @@ -0,0 +1,733 @@ +/** + * 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.leapclient; + +import java.io.ByteArrayInputStream; +import java.io.IOException; +import java.io.InputStream; +import java.math.BigInteger; +import java.security.KeyManagementException; +import java.security.KeyStore; +import java.security.KeyStoreException; +import java.security.NoSuchAlgorithmException; +import java.security.cert.CertificateException; +import java.security.cert.CertificateFactory; +import java.security.cert.X509Certificate; +import java.security.SecureRandom; +import javax.net.ssl.KeyManager; +import java.net.CookieHandler; +import java.net.CookieManager; +import java.net.HttpCookie; +import java.net.MalformedURLException; +import java.net.SocketTimeoutException; +import java.net.URISyntaxException; +import java.net.URL; +import java.net.URLConnection; +import java.net.UnknownHostException; +import java.util.Scanner; + +import javax.net.ssl.HostnameVerifier; +import javax.net.ssl.HttpsURLConnection; +import javax.net.ssl.SSLContext; +import javax.net.ssl.SSLSession; +import javax.net.ssl.TrustManagerFactory; +import javax.net.ssl.TrustManager; +import javax.net.ssl.X509TrustManager; + +import org.apache.http.HttpEntity; +import org.apache.http.HttpResponse; +import org.apache.http.client.ClientProtocolException; +import org.apache.http.client.methods.HttpDelete; +import org.apache.http.client.methods.HttpPost; +import org.apache.http.client.methods.HttpPut; +import org.apache.http.client.methods.HttpUriRequest; +import org.apache.http.client.protocol.ClientContext; +import org.apache.http.cookie.Cookie; +import org.apache.http.impl.client.DefaultHttpClient; +import org.apache.http.protocol.BasicHttpContext; +import org.apache.http.protocol.HttpContext; +import org.jboss.security.srp.SRPParameters; +import org.json.JSONException; +import org.json.JSONObject; + +import se.leap.leapclient.ProviderListContent.ProviderItem; + +import android.app.IntentService; +import android.content.Intent; +import android.os.Bundle; +import android.os.Handler; +import android.os.ResultReceiver; +import android.util.Base64; +import android.util.Log; +import android.widget.Toast; + +/** + * Implements HTTP api methods used to manage communications with the provider server. + * + * It's an IntentService because it downloads data from the Internet, so it operates in the background. + * + * @author parmegv + * @author MeanderingCode + * + */ +public class ProviderAPI extends IntentService { + + private Handler mHandler; + + public ProviderAPI() { + super("ProviderAPI"); + Log.v("ClassName", "Provider API"); + } + + @Override + public void onCreate() { + super.onCreate(); + mHandler = new Handler(); + } + + private void displayToast(final int toast_string_id) { + mHandler.post(new Runnable() { + + @Override + public void run() { + Toast.makeText(ProviderAPI.this, toast_string_id, Toast.LENGTH_LONG).show(); + } + }); + } + + @Override + protected void onHandleIntent(Intent task_for) { + final ResultReceiver receiver = task_for.getParcelableExtra("receiver"); + + Bundle task; + if((task = task_for.getBundleExtra(ConfigHelper.DOWNLOAD_JSON_FILES_BUNDLE_EXTRA)) != null) { + if(!downloadJsonFiles(task)) { + receiver.send(ConfigHelper.INCORRECTLY_DOWNLOADED_JSON_FILES, Bundle.EMPTY); + } else { + receiver.send(ConfigHelper.CORRECTLY_DOWNLOADED_JSON_FILES, Bundle.EMPTY); + } + } + else if ((task = task_for.getBundleExtra(ConfigHelper.UPDATE_PROVIDER_DOTJSON)) != null) { + Bundle result = updateProviderDotJSON(task); + if(result.getBoolean(ConfigHelper.RESULT_KEY)) { + receiver.send(ConfigHelper.CORRECTLY_UPDATED_PROVIDER_DOT_JSON, result); + } else { + receiver.send(ConfigHelper.INCORRECTLY_UPDATED_PROVIDER_DOT_JSON, Bundle.EMPTY); + } + } + else if ((task = task_for.getBundleExtra(ConfigHelper.DOWNLOAD_NEW_PROVIDER_DOTJSON)) != null) { + Bundle result = downloadNewProviderDotJSON(task); + if(result.getBoolean(ConfigHelper.RESULT_KEY)) { + receiver.send(ConfigHelper.CORRECTLY_UPDATED_PROVIDER_DOT_JSON, result); + } else { + receiver.send(ConfigHelper.INCORRECTLY_DOWNLOADED_JSON_FILES, Bundle.EMPTY); + } + } + else if ((task = task_for.getBundleExtra(ConfigHelper.SRP_AUTH)) != null) { + Bundle session_id_bundle = authenticateBySRP(task); + if(session_id_bundle.getBoolean(ConfigHelper.RESULT_KEY)) { + receiver.send(ConfigHelper.SRP_AUTHENTICATION_SUCCESSFUL, session_id_bundle); + } else { + Bundle user_message_bundle = new Bundle(); + String user_message_key = getResources().getString(R.string.user_message); + user_message_bundle.putString(user_message_key, session_id_bundle.getString(user_message_key)); + receiver.send(ConfigHelper.SRP_AUTHENTICATION_FAILED, user_message_bundle); + } + } + else if ((task = task_for.getBundleExtra(ConfigHelper.LOG_OUT)) != null) { + if(logOut(task)) { + receiver.send(ConfigHelper.LOGOUT_SUCCESSFUL, Bundle.EMPTY); + } else { + receiver.send(ConfigHelper.LOGOUT_FAILED, Bundle.EMPTY); + } + } + else if ((task = task_for.getBundleExtra(ConfigHelper.DOWNLOAD_CERTIFICATE)) != null) { + if(getNewCert(task)) { + receiver.send(ConfigHelper.CORRECTLY_DOWNLOADED_CERTIFICATE, Bundle.EMPTY); + } else { + receiver.send(ConfigHelper.INCORRECTLY_DOWNLOADED_CERTIFICATE, Bundle.EMPTY); + } + } + } + + /** + * Downloads the main cert and the eip-service.json files given through the task parameter + * @param task + * @return true if eip-service.json was parsed as a JSON object correctly. + */ + private boolean downloadJsonFiles(Bundle task) { + String cert_url = task.getString(ConfigHelper.MAIN_CERT_KEY); + String eip_service_json_url = task.getString(ConfigHelper.EIP_SERVICE_KEY); + boolean danger_on = task.getBoolean(ConfigHelper.DANGER_ON); + try { + String cert_string = getStringFromProvider(cert_url, danger_on); + ConfigHelper.saveSharedPref(ConfigHelper.MAIN_CERT_KEY, cert_string); + JSONObject eip_service_json = getJSONFromProvider(eip_service_json_url, danger_on); + ConfigHelper.saveSharedPref(ConfigHelper.EIP_SERVICE_KEY, eip_service_json); + return true; + } catch (JSONException e) { + return false; + } + } + + /** + * 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 ConfigHelper.RESULT_KEY, and which is true if authentication was successful. + */ + private Bundle authenticateBySRP(Bundle task) { + Bundle session_id_bundle = new Bundle(); + + String username = (String) task.get(ConfigHelper.USERNAME_KEY); + String password = (String) task.get(ConfigHelper.PASSWORD_KEY); + if(wellFormedPassword(password)) { + String authentication_server = (String) task.get(ConfigHelper.API_URL_KEY); + + SRPParameters params = new SRPParameters(new BigInteger(ConfigHelper.NG_1024, 16).toByteArray(), ConfigHelper.G.toByteArray(), BigInteger.ZERO.toByteArray(), "SHA-256"); + LeapSRPSession client = new LeapSRPSession(username, password, params); + byte[] A = client.exponential(); + try { + JSONObject saltAndB = sendAToSRPServer(authentication_server, username, new BigInteger(1, A).toString(16)); + if(saltAndB.length() > 0) { + String salt = saltAndB.getString(ConfigHelper.SALT_KEY); + byte[] Bbytes = new BigInteger(saltAndB.getString("B"), 16).toByteArray(); + byte[] M1 = client.response(new BigInteger(salt, 16).toByteArray(), Bbytes); + JSONObject session_idAndM2 = sendM1ToSRPServer(authentication_server, username, M1); + if(session_idAndM2.has("M2") && client.verify((byte[])session_idAndM2.get("M2"))) { + session_id_bundle.putBoolean(ConfigHelper.RESULT_KEY, true); + session_id_bundle.putString(ConfigHelper.SESSION_ID_KEY, session_idAndM2.getString(ConfigHelper.SESSION_ID_KEY)); + session_id_bundle.putString(ConfigHelper.SESSION_ID_COOKIE_KEY, session_idAndM2.getString(ConfigHelper.SESSION_ID_COOKIE_KEY)); + } else { + session_id_bundle.putBoolean(ConfigHelper.RESULT_KEY, false); + session_id_bundle.putString(getResources().getString(R.string.user_message), getResources().getString(R.string.error_bad_user_password_user_message)); + } + } else { + session_id_bundle.putString(getResources().getString(R.string.user_message), getResources().getString(R.string.error_bad_user_password_user_message)); + session_id_bundle.putBoolean(ConfigHelper.RESULT_KEY, false); + } + } catch (ClientProtocolException e) { + session_id_bundle.putBoolean(ConfigHelper.RESULT_KEY, false); + session_id_bundle.putString(getResources().getString(R.string.user_message), getResources().getString(R.string.error_client_http_user_message)); + } catch (IOException e) { + session_id_bundle.putBoolean(ConfigHelper.RESULT_KEY, false); + session_id_bundle.putString(getResources().getString(R.string.user_message), getResources().getString(R.string.error_io_exception_user_message)); + } catch (JSONException e) { + session_id_bundle.putBoolean(ConfigHelper.RESULT_KEY, false); + session_id_bundle.putString(getResources().getString(R.string.user_message), getResources().getString(R.string.error_json_exception_user_message)); + } catch (NoSuchAlgorithmException e) { + session_id_bundle.putBoolean(ConfigHelper.RESULT_KEY, false); + session_id_bundle.putString(getResources().getString(R.string.user_message), getResources().getString(R.string.error_no_such_algorithm_exception_user_message)); + } + } else { + session_id_bundle.putBoolean(ConfigHelper.RESULT_KEY, false); + session_id_bundle.putString(getResources().getString(R.string.user_message), getResources().getString(R.string.error_not_valid_password_user_message)); + } + + return session_id_bundle; + } + + /** + * Validates a password + * @param entered_password + * @return true if the entered password length is greater or equal to eight (8). + */ + private boolean wellFormedPassword(String entered_password) { + return entered_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 + * @throws ClientProtocolException + * @throws IOException + * @throws JSONException + */ + private JSONObject sendAToSRPServer(String server_url, String username, String clientA) throws ClientProtocolException, IOException, JSONException { + HttpPost post = new HttpPost(server_url + "/sessions.json" + "?" + "login=" + username + "&&" + "A=" + clientA); + return sendToServer(post); + } + + /** + * 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 + * @throws ClientProtocolException + * @throws IOException + * @throws JSONException + */ + private JSONObject sendM1ToSRPServer(String server_url, String username, byte[] m1) throws ClientProtocolException, IOException, JSONException { + HttpPut put = new HttpPut(server_url + "/sessions/" + username +".json" + "?" + "client_auth" + "=" + new BigInteger(1, ConfigHelper.trim(m1)).toString(16)); + JSONObject json_response = sendToServer(put); + + JSONObject session_idAndM2 = new JSONObject(); + if(json_response.length() > 0) { + byte[] M2_not_trimmed = new BigInteger(json_response.getString(ConfigHelper.M2_KEY), 16).toByteArray(); + Cookie session_id_cookie = LeapHttpClient.getInstance(getApplicationContext()).getCookieStore().getCookies().get(0); + session_idAndM2.put(ConfigHelper.SESSION_ID_COOKIE_KEY, session_id_cookie.getName()); + session_idAndM2.put(ConfigHelper.SESSION_ID_KEY, session_id_cookie.getValue()); + session_idAndM2.put(ConfigHelper.M2_KEY, ConfigHelper.trim(M2_not_trimmed)); + } + return session_idAndM2; + } + + /** + * Executes an HTTP request expecting a JSON response. + * @param request + * @return response from authentication server + * @throws ClientProtocolException + * @throws IOException + * @throws JSONException + */ + private JSONObject sendToServer(HttpUriRequest request) throws ClientProtocolException, IOException, JSONException { + DefaultHttpClient client = LeapHttpClient.getInstance(getApplicationContext()); + HttpContext localContext = new BasicHttpContext(); + localContext.setAttribute(ClientContext.COOKIE_STORE, client.getCookieStore()); + + HttpResponse getResponse = client.execute(request, localContext); + HttpEntity responseEntity = getResponse.getEntity(); + String plain_response = new Scanner(responseEntity.getContent()).useDelimiter("\\A").next(); + JSONObject json_response = new JSONObject(plain_response); + if(!json_response.isNull(ConfigHelper.ERRORS_KEY) || json_response.has(ConfigHelper.ERRORS_KEY)) { + return new JSONObject(); + } + + return json_response; + } + + /** + * 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 ConfigHelper.RESULT_KEY, and which is true if the update was successful. + */ + private Bundle updateProviderDotJSON(Bundle task) { + Bundle result = new Bundle(); + boolean custom = task.getBoolean(ConfigHelper.CUSTOM); + boolean danger_on = task.getBoolean(ConfigHelper.DANGER_ON); + String provider_json_url = task.getString(ConfigHelper.PROVIDER_JSON_URL); + String provider_name = task.getString(ConfigHelper.PROVIDER_NAME); + + try { + JSONObject provider_json = getJSONFromProvider(provider_json_url, danger_on); + if(provider_json == null) { + result.putBoolean(ConfigHelper.RESULT_KEY, false); + } else { + ConfigHelper.saveSharedPref(ConfigHelper.ALLOWED_ANON, provider_json.getJSONObject(ConfigHelper.SERVICE_KEY).getBoolean(ConfigHelper.ALLOWED_ANON)); + + //ProviderListContent.addItem(new ProviderItem(provider_name, provider_json_url, provider_json, custom, danger_on)); + result.putBoolean(ConfigHelper.RESULT_KEY, true); + result.putString(ConfigHelper.PROVIDER_KEY, provider_json.toString()); + result.putBoolean(ConfigHelper.DANGER_ON, danger_on); + } + } catch (JSONException e) { + result.putBoolean(ConfigHelper.RESULT_KEY, false); + } + + return result; + } + + /** + * Downloads a custom provider provider.json file + * @param task containing a boolean meaning if the user completely trusts this provider, and the provider main url entered in the new custom provider dialog. + * @return true if provider.json file was successfully parsed as a JSON object. + */ + private Bundle downloadNewProviderDotJSON(Bundle task) { + Bundle result = new Bundle(); + boolean custom = true; + boolean danger_on = task.getBoolean(ConfigHelper.DANGER_ON); + + String provider_main_url = (String) task.get(ConfigHelper.PROVIDER_MAIN_URL); + String provider_name = provider_main_url.replaceFirst("http[s]?://", "").replaceFirst("\\/", "_"); + String provider_json_url = guessProviderDotJsonURL(provider_main_url); + + JSONObject provider_json; + try { + provider_json = getJSONFromProvider(provider_json_url, danger_on); + if(provider_json == null) { + result.putBoolean(ConfigHelper.RESULT_KEY, false); + } else { + + ConfigHelper.saveSharedPref(ConfigHelper.PROVIDER_KEY, provider_json); + ConfigHelper.saveSharedPref(ConfigHelper.DANGER_ON, danger_on); + ConfigHelper.saveSharedPref(ConfigHelper.ALLOWED_ANON, provider_json.getJSONObject(ConfigHelper.SERVICE_KEY).getBoolean(ConfigHelper.ALLOWED_ANON)); + ProviderItem added_provider = new ProviderItem(provider_name, provider_json_url, provider_json, custom, danger_on); + ProviderListContent.addItem(added_provider); + + result.putString(ConfigHelper.PROVIDER_ID, added_provider.getId()); + result.putBoolean(ConfigHelper.RESULT_KEY, true); + result.putString(ConfigHelper.PROVIDER_KEY, provider_json.toString()); + result.putBoolean(ConfigHelper.DANGER_ON, danger_on); + } + } catch (JSONException e) { + result.putBoolean(ConfigHelper.RESULT_KEY, false); + } + + return result; + } + + /** + * Tries to download whatever is pointed by the string_url. + * + * 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 getStringFromProvider(String string_url, boolean danger_on) { + + String json_file_content = ""; + + URL provider_url = null; + int seconds_of_timeout = 1; + try { + provider_url = new URL(string_url); + URLConnection url_connection = provider_url.openConnection(); + url_connection.setConnectTimeout(seconds_of_timeout*1000); + json_file_content = new Scanner(url_connection.getInputStream()).useDelimiter("\\A").next(); + } catch (MalformedURLException e) { + displayToast(R.string.malformed_url); + } catch(SocketTimeoutException e) { + displayToast(R.string.server_is_down_message); + } catch (IOException e) { + if(provider_url != null) { + json_file_content = getStringFromProviderWithCACertAdded(provider_url, danger_on); + } else { + displayToast(R.string.certificate_error); + } + } catch (Exception e) { + if(provider_url != null && danger_on) { + json_file_content = getStringFromProviderWithCACertAdded(provider_url, danger_on); + } + } + + return json_file_content; + } + + /** + * Tries to download a string from given url without verifying the hostname. + * + * If a IOException still occurs, it tries with another bypass method: getStringFromProviderWithCACertAdded. + * @param string_url + * @return an empty string if everything fails, the url content if not. + */ + private String getStringFromProviderWithoutValidate( + URL string_url) { + + String json_string = ""; + HostnameVerifier hostnameVerifier = new HostnameVerifier() { + @Override + public boolean verify(String hostname, SSLSession session) { + return true; + } + }; + + try { + HttpsURLConnection urlConnection = + (HttpsURLConnection)string_url.openConnection(); + urlConnection.setHostnameVerifier(hostnameVerifier); + json_string = new Scanner(urlConnection.getInputStream()).useDelimiter("\\A").next(); + } catch (MalformedURLException e) { + displayToast(R.string.malformed_url); + } catch (IOException e) { + json_string = getStringFromProviderIgnoringCertificate(string_url); + } + + return json_string; + } + + /** + * Tries to download the contents of the provided url using main certificate from choosen provider. + * @param url + * @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 getStringFromProviderWithCACertAdded(URL url, boolean danger_on) { + String json_file_content = ""; + + // Load CAs from an InputStream + // (could be from a resource or ByteArrayInputStream or ...) + String cert_string = ConfigHelper.getStringFromSharedPref(ConfigHelper.MAIN_CERT_KEY); + if(cert_string.isEmpty() && danger_on) { + cert_string = downloadCertificateWithoutTrusting(url.getProtocol() + "://" + url.getHost() + "/" + "ca.crt"); + ConfigHelper.saveSharedPref(ConfigHelper.MAIN_CERT_KEY, cert_string); + } + + try { + java.security.cert.Certificate dangerous_certificate = ConfigHelper.parseX509CertificateFromString(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", dangerous_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); + + // Tell the URLConnection to use a SocketFactory from our SSLContext + HttpsURLConnection urlConnection = + (HttpsURLConnection)url.openConnection(); + urlConnection.setSSLSocketFactory(context.getSocketFactory()); + json_file_content = new Scanner(urlConnection.getInputStream()).useDelimiter("\\A").next(); + } catch (CertificateException e) { + // TODO Auto-generated catch block + e.printStackTrace(); + } catch (UnknownHostException e) { + displayToast(R.string.server_is_down_message); + } catch (IOException e) { + // The downloaded certificate doesn't validate our https connection. + if(danger_on) { + json_file_content = getStringFromProviderWithoutValidate(url); + } else { + displayToast(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(); + } + return json_file_content; + } + + /** + * Downloads the string that's in the url without regarding certificate validity + */ + private String getStringFromProviderIgnoringCertificate(URL url) { + String string = ""; + try { + 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()); + + HttpsURLConnection urlConnection = (HttpsURLConnection)url.openConnection(); + urlConnection.setSSLSocketFactory(context.getSocketFactory()); + urlConnection.setHostnameVerifier(new HostnameVerifier() { + @Override + public boolean verify(String arg0, SSLSession arg1) { + return true; + } + }); + string = new Scanner(urlConnection.getInputStream()).useDelimiter("\\A").next(); + System.out.println("String ignoring certificate = " + string); + } catch (IOException e) { + // The downloaded certificate doesn't validate our https connection. + e.printStackTrace(); + displayToast(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; + } + + /** + * Downloads the certificate from the parameter url bypassing self signed certificate SSL errors. + * @param certificate_url_string + * @return the certificate, as a string + */ + private String downloadCertificateWithoutTrusting(String certificate_url_string) { + + String cert_string = ""; + HostnameVerifier hostnameVerifier = new HostnameVerifier() { + @Override + public boolean verify(String hostname, SSLSession session) { + return true; + } + }; + + TrustManager[] trustAllCerts = new TrustManager[]{ + new X509TrustManager() { + public java.security.cert.X509Certificate[] getAcceptedIssuers() { + return null; + } + public void checkClientTrusted( java.security.cert.X509Certificate[] certs, String authType) { + } + public void checkServerTrusted( java.security.cert.X509Certificate[] certs, String authType) { + } + } + }; + + try { + URL certificate_url = new URL(certificate_url_string); + HttpsURLConnection urlConnection = + (HttpsURLConnection)certificate_url.openConnection(); + urlConnection.setHostnameVerifier(hostnameVerifier); + + SSLContext sc = SSLContext.getInstance("TLS"); + sc.init(null, trustAllCerts, new java.security.SecureRandom()); + + urlConnection.setSSLSocketFactory(sc.getSocketFactory()); + + cert_string = new Scanner(urlConnection.getInputStream()).useDelimiter("\\A").next(); + + } catch (MalformedURLException e) { + // TODO Auto-generated catch block + e.printStackTrace(); + } catch (IOException e) { + // This should never happen + e.printStackTrace(); + } catch (NoSuchAlgorithmException e) { + // TODO Auto-generated catch block + e.printStackTrace(); + } catch (KeyManagementException e) { + // TODO Auto-generated catch block + e.printStackTrace(); + } + + return cert_string; + } + + /** + * Downloads a JSON object from the given url. + * + * It first downloads the JSON object as a String, and then parses it to JSON object. + * @param json_url + * @param danger_on if the user completely trusts the certificate of the url address. + * @return + * @throws JSONException + */ + private JSONObject getJSONFromProvider(String json_url, boolean danger_on) throws JSONException { + String json_file_content = getStringFromProvider(json_url, danger_on); + return new JSONObject(json_file_content); + } + + /** + * Tries to guess the provider.json url given the main provider url. + * @param provider_main_url + * @return the guessed provider.json url + */ + private String guessProviderDotJsonURL(String provider_main_url) { + return provider_main_url + "/provider.json"; + } + + /** + * Logs out from the api url retrieved from the task. + * @param task containing api url from which the user will log out + * @return true if there were no exceptions + */ + private boolean logOut(Bundle task) { + DefaultHttpClient client = LeapHttpClient.getInstance(getApplicationContext()); + int session_id_index = 0; + //String delete_url = task.getString(ConfigHelper.srp_server_url_key) + "/sessions/" + client.getCookieStore().getCookies().get(0).getValue(); + try { + String delete_url = task.getString(ConfigHelper.API_URL_KEY) + "/logout" + "?authenticity_token=" + client.getCookieStore().getCookies().get(session_id_index).getValue(); + HttpDelete delete = new HttpDelete(delete_url); + HttpResponse getResponse = client.execute(delete); + HttpEntity responseEntity = getResponse.getEntity(); + responseEntity.consumeContent(); + } 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 + e.printStackTrace(); + return false; + } + return true; + } + + /** + * Downloads a new OpenVPN certificate, attaching authenticated cookie for authenticated certificate. + * + * @param task containing the type of the certificate to be downloaded + * @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 getNewCert(Bundle task) { + String type_of_certificate = task.getString(ConfigHelper.TYPE_OF_CERTIFICATE); + try { + JSONObject provider_json = ConfigHelper.getJsonFromSharedPref(ConfigHelper.PROVIDER_KEY); + URL provider_main_url = new URL(provider_json.getString(ConfigHelper.API_URL_KEY)); + String new_cert_string_url = provider_main_url.toString() + "/" + provider_json.getString(ConfigHelper.API_VERSION_KEY) + "/" + ConfigHelper.CERT_KEY; + + if(type_of_certificate.equalsIgnoreCase(ConfigHelper.AUTHED_CERTIFICATE)) { + HttpCookie session_id_cookie = new HttpCookie(task.getString(ConfigHelper.SESSION_ID_COOKIE_KEY), task.getString(ConfigHelper.SESSION_ID_KEY)); + + CookieManager cookieManager = new CookieManager(); + cookieManager.getCookieStore().add(provider_main_url.toURI(), session_id_cookie); + CookieHandler.setDefault(cookieManager); + } + + boolean danger_on = ConfigHelper.getBoolFromSharedPref(ConfigHelper.DANGER_ON); + String cert_string = getStringFromProvider(new_cert_string_url, danger_on); + if(!cert_string.isEmpty()) { + // API returns concatenated cert & key. Split them for OpenVPN options + String certificate = null, key = null; + String[] certAndKey = cert_string.split("(?<=-\n)"); + for (int i=0; i < certAndKey.length-1; i++){ + if ( certAndKey[i].contains("KEY") ) + key = certAndKey[i++] + certAndKey[i]; + else if ( certAndKey[i].contains("CERTIFICATE") ) + certificate = certAndKey[i++] + certAndKey[i]; + } + ConfigHelper.saveSharedPref(ConfigHelper.CERT_KEY, certificate); + ConfigHelper.saveSharedPref(ConfigHelper.KEY_KEY, key); + return true; + } else { + return false; + } + } catch (IOException e) { + // TODO Auto-generated catch block + e.printStackTrace(); + return false; + } catch (JSONException e) { + // TODO Auto-generated catch block + e.printStackTrace(); + return false; + } catch (URISyntaxException e) { + // TODO Auto-generated catch block + e.printStackTrace(); + return false; + } + } +} |