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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.eip;
import android.util.Log;
import java.security.cert.CertificateExpiredException;
import java.security.cert.CertificateNotYetValidException;
import java.security.cert.X509Certificate;
import java.util.Calendar;
import se.leap.bitmaskclient.ConfigHelper;
public class VpnCertificateValidator {
public final static String TAG = VpnCertificateValidator.class.getSimpleName();
private String certificate;
public VpnCertificateValidator(String certificate) {
this.certificate = certificate;
}
public boolean isValid() {
if(!certificate.isEmpty()) {
X509Certificate certificate_x509 = ConfigHelper.parseX509CertificateFromString(certificate);
return isValid(certificate_x509);
} else return true;
}
private boolean isValid(X509Certificate certificate) {
Calendar offset_date = calculateOffsetCertificateValidity(certificate);
try {
Log.d(TAG, "offset_date = " + offset_date.getTime().toString());
certificate.checkValidity(offset_date.getTime());
return true;
} catch(CertificateExpiredException e) {
return false;
} catch(CertificateNotYetValidException e) {
return false;
}
}
private Calendar calculateOffsetCertificateValidity(X509Certificate certificate) {
Log.d(TAG, "certificate not after = " + certificate.getNotAfter());
long preventive_time = Math.abs(certificate.getNotBefore().getTime() - certificate.getNotAfter().getTime())/2;
long current_date_millis = Calendar.getInstance().getTimeInMillis();
Calendar limit_date = Calendar.getInstance();
limit_date.setTimeInMillis(current_date_millis + preventive_time);
return limit_date;
}
}
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