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/*
************************************************************************
******************* CANADIAN ASTRONOMY DATA CENTRE *******************
************** CENTRE CANADIEN DE DONNÉES ASTRONOMIQUES **************
*
* (c) 2011. (c) 2011.
* Government of Canada Gouvernement du Canada
* National Research Council Conseil national de recherches
* Ottawa, Canada, K1A 0R6 Ottawa, Canada, K1A 0R6
* All rights reserved Tous droits réservés
*
* NRC disclaims any warranties, Le CNRC dénie toute garantie
* expressed, implied, or énoncée, implicite ou légale,
* statutory, of any kind with de quelque nature que ce
* respect to the software, soit, concernant le logiciel,
* including without limitation y compris sans restriction
* any warranty of merchantability toute garantie de valeur
* or fitness for a particular marchande ou de pertinence
* purpose. NRC shall not be pour un usage particulier.
* liable in any event for any Le CNRC ne pourra en aucun cas
* damages, whether direct or être tenu responsable de tout
* indirect, special or general, dommage, direct ou indirect,
* consequential or incidental, particulier ou général,
* arising from the use of the accessoire ou fortuit, résultant
* software. Neither the name de l'utilisation du logiciel. Ni
* of the National Research le nom du Conseil National de
* Council of Canada nor the Recherches du Canada ni les noms
* names of its contributors may de ses participants ne peuvent
* be used to endorse or promote être utilisés pour approuver ou
* products derived from this promouvoir les produits dérivés
* software without specific prior de ce logiciel sans autorisation
* written permission. préalable et particulière
* par écrit.
*
* This file is part of the Ce fichier fait partie du projet
* OpenCADC project. OpenCADC.
*
* OpenCADC is free software: OpenCADC est un logiciel libre ;
* you can redistribute it and/or vous pouvez le redistribuer ou le
* modify it under the terms of modifier suivant les termes de
* the GNU Affero General Public la “GNU Affero General Public
* License as published by the License” telle que publiée
* Free Software Foundation, par la Free Software Foundation
* either version 3 of the : soit la version 3 de cette
* License, or (at your option) licence, soit (à votre gré)
* any later version. toute version ultérieure.
*
* OpenCADC is distributed in the OpenCADC est distribué
* hope that it will be useful, dans l’espoir qu’il vous
* but WITHOUT ANY WARRANTY; sera utile, mais SANS AUCUNE
* without even the implied GARANTIE : sans même la garantie
* warranty of MERCHANTABILITY implicite de COMMERCIALISABILITÉ
* or FITNESS FOR A PARTICULAR ni d’ADÉQUATION À UN OBJECTIF
* PURPOSE. See the GNU Affero PARTICULIER. Consultez la Licence
* General Public License for Générale Publique GNU Affero
* more details. pour plus de détails.
*
* You should have received Vous devriez avoir reçu une
* a copy of the GNU Affero copie de la Licence Générale
* General Public License along Publique GNU Affero avec
* with OpenCADC. If not, see OpenCADC ; si ce n’est
* <http://www.gnu.org/licenses/>. pas le cas, consultez :
* <http://www.gnu.org/licenses/>.
*
* $Revision: 5 $
*
************************************************************************
*/
package ca.nrc.cadc.cred.client;
import ca.nrc.cadc.auth.AuthMethod;
import ca.nrc.cadc.auth.AuthenticationUtil;
import ca.nrc.cadc.auth.SSLUtil;
import ca.nrc.cadc.auth.X509CertificateChain;
import ca.nrc.cadc.profiler.Profiler;
import ca.nrc.cadc.reg.Standards;
import ca.nrc.cadc.reg.client.LocalAuthority;
import java.io.File;
import java.net.URI;
import java.security.AccessControlException;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.cert.CertificateException;
import java.security.cert.CertificateExpiredException;
import javax.security.auth.Subject;
import org.apache.log4j.Logger;
/**
* Utility class to support a standard server-side use of the CredClient. Server-side
* applications typically have to have valid credentials for the current user in order
* to call other services on the user's behalf. The methods here support the standard
* usage as follows:
* <ul>
* <li>check Subject for a valid proxy certificate
* <li>discard stored but invalid certificate
* <li>load certificate for ops user from${user.home}/.ssl/cadcproxy.pem
* <li>use CredClient as ops user to retrieve a new proxy certificate for the current user
* <li>store the user certificate in the Subject
* </ul>
*
* @author pdowler
*/
public class CredUtil
{
private static final Logger log = Logger.getLogger(CredUtil.class);
public static final double PROXY_CERT_DURATION = 0.1; // couple of hours
private CredUtil() { }
private static Subject createOpsSubject()
{
File pemFile = new File(System.getProperty("user.home") + "/.ssl/cadcproxy.pem");
return SSLUtil.createSubject(pemFile);
}
/**
* Check if the current subject has usable credentials (a valid X509 proxy
* certificate) and call the local CDP service if necessary.
*
* @throws AccessControlException
* @return true if subject has valid credentials, false if subject is anonymous
*/
public static boolean checkCredentials()
throws AccessControlException
{
return checkCredentials(AuthenticationUtil.getCurrentSubject());
}
/**
* Check if the specified subject has usable credentials (a valid X509 proxy
* certificate) and call the local CDP service if necessary. This method uses
* the <code>ca.nrc.cadc.reg.client.LocalAuthority</code> class to find the
* local CDP service. Thus, this usage only makes sense in server-side
* applications.
*
* @param subject
* @return true if subject has valid credentials, false if subject is anonymous
*/
public static boolean checkCredentials(final Subject subject)
throws AccessControlException
{
AuthMethod am = AuthenticationUtil.getAuthMethod(subject);
if (am == null || AuthMethod.ANON.equals(am))
return false;
try
{
X509CertificateChain privateKeyChain = X509CertificateChain.findPrivateKeyChain(
subject.getPublicCredentials());
if (privateKeyChain != null)
{
try
{
privateKeyChain.getChain()[0].checkValidity();
}
catch(CertificateException ex)
{
privateKeyChain = null; // get new one below
}
}
if (privateKeyChain == null)
{
LocalAuthority loc = new LocalAuthority();
URI credURI = loc.getServiceURI(Standards.CRED_PROXY_10.toASCIIString());
final CredClient cred = new CredClient(credURI);
Subject opsSubject = createOpsSubject();
try
{
privateKeyChain = Subject.doAs(opsSubject, new PrivilegedExceptionAction<X509CertificateChain>()
{
public X509CertificateChain run() throws Exception
{
return cred.getProxyCertificate(subject, PROXY_CERT_DURATION);
}
});
}
catch(PrivilegedActionException ex)
{
throw new RuntimeException("CredClient.getProxyCertficate failed", ex.getException());
}
if (privateKeyChain == null)
{
throw new AccessControlException("credential service did not return a delegated certificate");
}
privateKeyChain.getChain()[0].checkValidity();
subject.getPublicCredentials().add(privateKeyChain);
}
}
catch (CertificateException e)
{
throw new AccessControlException("credential service returned an invalid certificate");
}
return true;
}
}