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package se.leap.leapclient;
import java.io.IOException;
import java.math.BigInteger;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.Scanner;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
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.ResultReceiver;
import android.util.Log;
public class ProviderAPI extends IntentService {
public ProviderAPI() {
super("ProviderAPI");
Log.v("ClassName", "Provider API");
}
@Override
protected void onHandleIntent(Intent task_for) {
final ResultReceiver receiver = task_for.getParcelableExtra("receiver");
Bundle task;
if((task = task_for.getBundleExtra(ConfigHelper.downloadJsonFilesBundleExtra)) != 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.downloadNewProviderDotJSON)) != null) {
if(downloadNewProviderDotJSON(task))
receiver.send(ConfigHelper.CORRECTLY_DOWNLOADED_JSON_FILES, Bundle.EMPTY);
else
receiver.send(ConfigHelper.INCORRECTLY_DOWNLOADED_JSON_FILES, Bundle.EMPTY);
}
}
private boolean downloadJsonFiles(Bundle task) {
String cert_url = (String) task.get(ConfigHelper.cert_key);
String eip_service_json_url = (String) task.get(ConfigHelper.eip_service_key);
try {
String cert_string = getStringFromProvider(cert_url);
JSONObject cert_json = new JSONObject("{ \"certificate\" : \"" + cert_string + "\"}");
ConfigHelper.saveSharedPref(ConfigHelper.cert_key, cert_json);
JSONObject eip_service_json = getJSONFromProvider(eip_service_json_url);
ConfigHelper.saveSharedPref(ConfigHelper.eip_service_key, eip_service_json);
return true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
} catch (JSONException e) {
ConfigHelper.rescueJSONException(e);
return false;
} catch(Exception e) {
e.printStackTrace();
return false;
}
}
private boolean registerWithSRP(Bundle task) {
String username = (String) task.get(ConfigHelper.username_key);
String password = (String) task.get(ConfigHelper.password_key);
String authentication_server = (String) task.get(ConfigHelper.srp_server_url_key);
BigInteger ng_1024 = new BigInteger(ConfigHelper.NG_1024, 16);
BigInteger salt = ng_1024.probablePrime(1024, null);
byte[] salt_in_bytes = salt.toByteArray();
return false;
}
private boolean authenticateBySRP(Bundle task) {
String username = (String) task.get(ConfigHelper.username_key);
String password = (String) task.get(ConfigHelper.password_key);
String authentication_server = (String) task.get(ConfigHelper.srp_server_url_key);
String salt = "abcd";
SRPParameters params = new SRPParameters(new BigInteger(ConfigHelper.NG_1024, 16).toByteArray(), new BigInteger("2").toByteArray(), new BigInteger(salt, 16).toByteArray(), "SHA-256");
//SRPClientSession client = new SRPClientSession(username, password.toCharArray(), params);
LeapSRPSession client = new LeapSRPSession(username, password.toCharArray(), params);
byte[] A = client.exponential();
try {
JSONObject saltAndB = sendAToSRPServer(authentication_server, username, new BigInteger(A).toString(16));
if(saltAndB.length() > 0) {
byte[] B = saltAndB.getString("B").getBytes();
salt = saltAndB.getString("salt");
params = new SRPParameters(new BigInteger(ConfigHelper.NG_1024, 16).toByteArray(), new BigInteger("2").toByteArray(), new BigInteger(salt, 16).toByteArray(), "SHA-256");
//client = new SRPClientSession(username, password.toCharArray(), params);
client = new LeapSRPSession(username, password.toCharArray(), params);
A = client.exponential();
saltAndB = sendAToSRPServer(authentication_server, username, new BigInteger(A).toString(16));
String Bhex = saltAndB.getString("B");
byte[] M1 = client.response(new BigInteger(Bhex, 16).toByteArray());
byte[] M2 = sendM1ToSRPServer(authentication_server, username, M1);
if( client.verify(M2) == false )
throw new SecurityException("Failed to validate server reply");
return true;
}
else return false;
} catch (ClientProtocolException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return false;
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return false;
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return false;
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
}
private JSONObject sendAToSRPServer(String server_url, String username, String clientA) throws ClientProtocolException, IOException, JSONException {
DefaultHttpClient client = LeapHttpClient.getInstance(getApplicationContext());
String parameter_chain = "A" + "=" + clientA + "&" + "login" + "=" + username;
HttpPost post = new HttpPost(server_url + "/sessions.json" + "?" + parameter_chain);
HttpResponse getResponse = client.execute(post);
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("errors") || json_response.has("errors")) {
return new JSONObject();
}
List<Cookie> cookies = client.getCookieStore().getCookies();
if(!cookies.isEmpty()) {
String session_id = cookies.get(0).getValue();
}
return json_response;
}
private byte[] sendM1ToSRPServer(String server_url, String username, byte[] m1) throws ClientProtocolException, IOException, JSONException {
DefaultHttpClient client = LeapHttpClient.getInstance(getApplicationContext());
String parameter_chain = "client_auth" + "=" + new BigInteger(m1).toString(16);
HttpPut put = new HttpPut(server_url + "/sessions/" + username +".json" + "?" + parameter_chain);
HttpContext localContext = new BasicHttpContext();
localContext.setAttribute(ClientContext.COOKIE_STORE, client.getCookieStore());
HttpResponse getResponse = client.execute(put, 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("errors") || json_response.has("errors")) {
return new byte[0];
}
return json_response.getString("M2").getBytes();
}
private boolean downloadNewProviderDotJSON(Bundle task) {
boolean custom = true;
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 = guessURL(provider_main_url);
JSONObject provider_json = null;
try {
provider_json = getJSONFromProvider(provider_json_url);
} catch (IOException e) {
// It could happen that an https site used a certificate not trusted.
provider_json = downloadNewProviderDotJsonWithoutCert(provider_json_url);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
if(provider_json == null) {
return false;
} else {
String filename = provider_name + "_provider.json".replaceFirst("__", "_");
ConfigHelper.saveFile(filename, provider_json.toString());
ConfigHelper.saveSharedPref(ConfigHelper.provider_key, provider_json);
ProviderListContent.addItem(new ProviderItem(provider_name, ConfigHelper.openFileInputStream(filename), custom));
return true;
}
}
private boolean downloadJsonFilesBundleExtra(Bundle task) {
//TODO task only contains provider main url -> we need to infer cert_url, provider_name and eip_service_json_url from that.
String provider_main_url = (String) task.get(ConfigHelper.provider_main_url);
String provider_name = ConfigHelper.extractProviderName(provider_main_url);
String cert_url = (String) task.get(ConfigHelper.cert_key);
String eip_service_json_url = (String) task.get(ConfigHelper.eip_service_key);
try {
//JSONObject provider_json = new JSONObject("{ \"provider\" : \"" + provider_name + "\"}");
//ConfigHelper.saveSharedPref(ConfigHelper.provider_key, provider_json);
/*String cert_string = getStringFromProvider(cert_url);
JSONObject cert_json = new JSONObject("{ \"certificate\" : \"" + cert_string + "\"}");
ConfigHelper.saveSharedPref(ConfigHelper.cert_key, cert_json);
ConfigHelper.addTrustedCertificate(provider_name, cert_string);*/
URL cacert = new URL(cert_url);
ConfigHelper.addTrustedCertificate(provider_name, cacert.openStream());
JSONObject eip_service_json = getJSONFromProvider(eip_service_json_url);
ConfigHelper.saveSharedPref(ConfigHelper.eip_service_key, eip_service_json);
return true;
} catch (IOException e) {
//TODO It could happen when the url is not valid.
e.printStackTrace();
return false;
} catch (JSONException e) {
ConfigHelper.rescueJSONException(e);
return false;
} catch(Exception e) {
e.printStackTrace();
return false;
}
}
private JSONObject downloadNewProviderDotJsonWithoutCert(
String provider_json_url) {
JSONObject provider_json = null;
try {
URL provider_url = new URL(provider_json_url);
String provider_json_string = new Scanner(provider_url.openStream()).useDelimiter("\\A").next();
provider_json = new JSONObject(provider_json_string);
} catch (MalformedURLException e1) {
e1.printStackTrace();
} catch (UnknownHostException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
} catch (JSONException e1) {
e1.printStackTrace();
}
return provider_json;
}
private String guessURL(String provider_main_url) {
return provider_main_url + "/provider.json";
}
private String getStringFromProvider(String string_url) throws IOException {
String json_file_content = "";
DefaultHttpClient client = LeapHttpClient.getInstance(getApplicationContext());
HttpGet get = new HttpGet(string_url);
// Execute the GET call and obtain the response
HttpResponse getResponse = client.execute(get);
HttpEntity responseEntity = getResponse.getEntity();
json_file_content = new Scanner(responseEntity.getContent()).useDelimiter("\\A").next();
return json_file_content;
}
private JSONObject getJSONFromProvider(String json_url) throws IOException, JSONException {
String json_file_content = getStringFromProvider(json_url);
return new JSONObject(json_file_content);
}
}
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