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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 androidx.annotation.VisibleForTesting;
import java.security.cert.CertificateExpiredException;
import java.security.cert.CertificateNotYetValidException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import se.leap.bitmaskclient.base.utils.ConfigHelper;
public class VpnCertificateValidator {
public final static String TAG = VpnCertificateValidator.class.getSimpleName();
private final String certificate;
private CalendarProviderInterface calendarProvider;
public VpnCertificateValidator(String certificate) {
this.certificate = certificate;
this.calendarProvider = new CalendarProvider();
}
@VisibleForTesting
public void setCalendarProvider(CalendarProviderInterface calendarProvider) {
this.calendarProvider = calendarProvider;
}
/**
*
* @return true if all certificates are valid for 1 more day
*/
public boolean isValid() {
return isValid(1);
}
/**
*
* @return return true if certificates will expire in 8 days or less
*/
public boolean shouldBeUpdated() {
return !isValid(8);
}
private boolean isValid(int offsetDays) {
if (certificate.isEmpty()) {
return false;
}
ArrayList<X509Certificate> x509Certificates = ConfigHelper.parseX509CertificatesFromString(certificate);
if (x509Certificates == null) {
return false;
}
for (X509Certificate cert : x509Certificates) {
if (!isValid(cert, offsetDays)) {
return false;
}
}
return true;
}
private boolean isValid(X509Certificate certificate, int offsetDays) {
if (certificate == null) {
return false;
}
Calendar offsetDate = calculateOffsetCertificateValidity(certificate, offsetDays);
try {
certificate.checkValidity(offsetDate.getTime());
return true;
} catch (CertificateExpiredException e) {
return false;
} catch (CertificateNotYetValidException e) {
return false;
}
}
private Calendar calculateOffsetCertificateValidity(X509Certificate certificate, int offsetDays) {
Calendar limitDate = calendarProvider.getCalendar();
Date startDate = certificate.getNotBefore();
// if certificates start date is before current date just return the current date without an offset
if (startDate.getTime() >= limitDate.getTime().getTime()) {
return limitDate;
}
// else add an offset to the current date
limitDate.add(Calendar.DAY_OF_YEAR, offsetDays);
return limitDate;
}
}
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