1 files changed, 317 insertions, 0 deletions
diff --git a/src/se/leap/bitmaskclient/ConfigHelper.java b/src/se/leap/bitmaskclient/ConfigHelper.java
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+++ b/src/se/leap/bitmaskclient/ConfigHelper.java
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+/**
+ * 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 java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.math.BigInteger;
+import java.io.InputStream;
+import java.security.KeyFactory;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import java.security.interfaces.RSAPrivateKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.PKCS8EncodedKeySpec;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.util.Base64;
+
+/**
+ * Stores constants, and implements auxiliary methods used across all LEAP Android classes.
+ * 
+ * @author parmegv
+ * @author MeanderingCode
+ *
+ */
+public class ConfigHelper {
+    
+    public static SharedPreferences shared_preferences;
+    private static KeyStore keystore_trusted;
+    
+    final public static String NG_1024 =
+    		"eeaf0ab9adb38dd69c33f80afa8fc5e86072618775ff3c0b9ea2314c9c256576d674df7496ea81d3383b4813d692c6e0e0d5d8e250b98be48e495c1d6089dad15dc7d7b46154d6b6ce8ef4ad69b15d4982559b297bcf1885c529f566660e57ec68edbc3c05726cc02fd4cbf4976eaa9afd5138fe8376435b9fc61d2fc0eb06e3";
+    final public static BigInteger G = new BigInteger("2");
+	
+    
+    private static boolean checkSharedPrefs() {
+    	try {
+    		shared_preferences = Dashboard.getAppContext().getSharedPreferences(Dashboard.SHARED_PREFERENCES,Context.MODE_PRIVATE);
+    	} catch (Exception e) {
+    		return false;
+    	}
+    	
+    	return true;
+    }
+    
+    /**
+     * Saves a JSON object into class scope Shared Preferences
+     * @param shared_preferences_key
+     * @param content
+     */
+	public static void saveSharedPref(String shared_preferences_key, JSONObject content) {
+
+		SharedPreferences.Editor shared_preferences_editor = shared_preferences
+				.edit();
+		shared_preferences_editor.putString(shared_preferences_key,
+				content.toString());
+		shared_preferences_editor.commit();
+	}
+
+    /**
+     * Saves a String object into class scope Shared Preferences
+     * @param shared_preferences_key
+     * @param content
+     */
+	public static void saveSharedPref(String shared_preferences_key, String content) {
+
+		SharedPreferences.Editor shared_preferences_editor = shared_preferences
+				.edit();
+		shared_preferences_editor.putString(shared_preferences_key,
+				content);
+		shared_preferences_editor.commit();
+	}
+
+    /**
+     * Saves a boolean object into class scope Shared Preferences
+     * @param shared_preferences_key
+     * @param content
+     */
+	public static void saveSharedPref(String shared_preferences_key, boolean content) {
+
+		SharedPreferences.Editor shared_preferences_editor = shared_preferences
+				.edit();
+		shared_preferences_editor.putBoolean(shared_preferences_key, content);
+		shared_preferences_editor.commit();
+	}
+	
+	/**
+	 * Saves an int into class scope Shared Preferences
+	 * 
+	 * @param shared_preferences_key
+	 * @param value
+	 */
+	protected static void saveSharedPref(String shared_preferences_key, int value) {
+		SharedPreferences.Editor shared_preferences_editor = shared_preferences.edit();
+		shared_preferences_editor.putInt(shared_preferences_key, value).commit();
+	}
+	
+	/**
+	 * Gets String object from class scope Shared Preferences
+	 * @param shared_preferences_key
+	 * @return the string correspondent to the key parameter
+	 */
+	public static String getStringFromSharedPref(String shared_preferences_key) {
+		String content = null;
+		content = shared_preferences.getString(shared_preferences_key, "");
+		return content;
+	}
+	
+	/**
+	 * Gets JSON object from class scope Shared Preferences
+	 * @param shared_preferences_key
+	 * @return the JSON object correspondent to the key parameter
+	 */
+	public static JSONObject getJsonFromSharedPref(String shared_preferences_key) throws JSONException {
+		JSONObject content = null;
+		if ( checkSharedPrefs() ) {
+			String json_string = shared_preferences.getString(shared_preferences_key, "");
+			content = new JSONObject(json_string);
+		}
+		
+		return content;
+	}
+	
+	/*
+	 * This method defaults to false.
+	 * If you use this method, be sure to fail-closed on false!
+	 * TODO This is obviously less than ideal...solve it!
+	 */
+	public static boolean getBoolFromSharedPref(String shared_preferences_key) {
+		boolean value = false;
+		if ( checkSharedPrefs() ) {
+			value = shared_preferences.getBoolean(shared_preferences_key, false);
+		}
+		return value;
+	}
+
+	/**
+	 * Get an int from SharedPreferences
+	 * 
+	 * @param shared_preferences_key	Key to retrieve
+	 * @return	The value for the key or 0
+	 */
+	protected static int getIntFromSharedPref(String shared_preferences_key) {
+		return shared_preferences.getInt(shared_preferences_key, 0);
+	}
+	
+	/*
+	 * This method defaults to false.
+	 * If you use this method, be sure to fail-closed on false!
+	 * TODO This is obviously less than ideal...solve it!
+	 */
+	public static boolean removeFromSharedPref(String shared_preferences_key) {
+		SharedPreferences.Editor shared_preferences_editor = shared_preferences
+				.edit();
+		shared_preferences_editor.remove(shared_preferences_key);
+		return shared_preferences_editor.commit();
+	}
+
+	/**
+	 *  Treat the input as the MSB representation of a number,
+	 *  and lop off leading zero elements.  For efficiency, the
+	 *  input is simply returned if no leading zeroes are found.
+	 *  
+	 *  @param in array to be trimmed
+	 */
+	public static byte[] trim(byte[] in) {
+		if(in.length == 0 || in[0] != 0)
+			return in;
+
+		int len = in.length;
+		int i = 1;
+		while(in[i] == 0 && i < len)
+			++i;
+		byte[] ret = new byte[len - i];
+		System.arraycopy(in, i, ret, 0, len - i);
+		return ret;
+	}
+
+	/**
+	 * Sets class scope Shared Preferences
+	 * @param shared_preferences
+	 */
+	public static void setSharedPreferences(
+			SharedPreferences shared_preferences) {
+		ConfigHelper.shared_preferences = shared_preferences;
+	}
+	
+	public static X509Certificate parseX509CertificateFromString(String certificate_string) {
+		java.security.cert.Certificate certificate = null;
+		CertificateFactory cf;
+		try {
+			cf = CertificateFactory.getInstance("X.509");
+
+			certificate_string = certificate_string.replaceFirst("-----BEGIN CERTIFICATE-----", "").replaceFirst("-----END CERTIFICATE-----", "").trim();
+			byte[] cert_bytes = Base64.decode(certificate_string, Base64.DEFAULT);
+			InputStream caInput =  new ByteArrayInputStream(cert_bytes);
+			try {
+				certificate = cf.generateCertificate(caInput);
+				System.out.println("ca=" + ((X509Certificate) certificate).getSubjectDN());
+			} finally {
+				caInput.close();
+			}
+		} catch (CertificateException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		} catch (IOException e) {
+			return null;
+		}
+		
+		return (X509Certificate) certificate;
+	}
+	
+	protected static RSAPrivateKey parseRsaKeyFromString(String RsaKeyString) {
+		RSAPrivateKey key = null;
+		try {
+			KeyFactory kf = KeyFactory.getInstance("RSA", "BC");
+			
+			RsaKeyString = RsaKeyString.replaceFirst("-----BEGIN RSA PRIVATE KEY-----", "").replaceFirst("-----END RSA PRIVATE KEY-----", "");
+			PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec( Base64.decode(RsaKeyString, Base64.DEFAULT) );
+			key = (RSAPrivateKey) kf.generatePrivate(keySpec);
+		} catch (InvalidKeySpecException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+			return null;
+		} catch (NoSuchAlgorithmException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+			return null;
+		} catch (NoSuchProviderException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+			return null;
+		}
+		
+		return key;
+	}
+
+	/**
+	 * Adds a new X509 certificate given its input stream and its provider name
+	 * @param provider used to store the certificate in the keystore
+	 * @param inputStream from which X509 certificate must be generated.
+	 */
+	public static void addTrustedCertificate(String provider, InputStream inputStream) {
+		CertificateFactory cf;
+		try {
+			cf = CertificateFactory.getInstance("X.509");
+			X509Certificate cert =
+					(X509Certificate)cf.generateCertificate(inputStream);
+			keystore_trusted.setCertificateEntry(provider, cert);
+		} catch (CertificateException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		} catch (KeyStoreException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+	}
+
+	/**
+	 * Adds a new X509 certificate given in its string from and using its provider name
+	 * @param provider used to store the certificate in the keystore
+	 * @param certificate
+	 */
+	public static void addTrustedCertificate(String provider, String certificate) {
+
+		try {
+			X509Certificate cert = ConfigHelper.parseX509CertificateFromString(certificate);
+			if(keystore_trusted == null) {
+				keystore_trusted = KeyStore.getInstance("BKS");
+				keystore_trusted.load(null);
+			}
+			keystore_trusted.setCertificateEntry(provider, cert);
+		} 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();
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+	}
+	
+	/**
+	 * @return class wide keystore
+	 */
+	public static KeyStore getKeystore() {
+		return keystore_trusted;
+	}
+}