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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 $
*
************************************************************************
*/
Patrick Dowler
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package ca.nrc.cadc.cred.server;
import java.io.IOException;
import java.security.AccessControlException;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import javax.security.auth.Subject;
import javax.security.auth.x500.X500Principal;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.astrogrid.security.delegation.DelegationServlet;
import ca.nrc.cadc.auth.AuthenticationUtil;
import ca.nrc.cadc.log.ServletLogInfo;
import ca.nrc.cadc.log.WebServiceLogInfo;
/**
* This servlet is used in inject AccessControl information
*/
public class CadcDelegationServlet extends DelegationServlet
{
private static final long serialVersionUID = 2740612605831268729L;
private static Logger LOGGER = Logger.getLogger(CadcDelegationServlet.class);
public static final String SU_DNS = "suDNs";
private Set<X500Principal> suDNs = new HashSet<X500Principal>();
/**
* Read the configuration.
*/
public void init(final ServletConfig config)
throws ServletException
{
super.init(config);
String suDNStr = config.getInitParameter(SU_DNS);
if (suDNStr != null)
{
String[] dns = suDNStr.split("\n");
for (String dn : dns)
{
String sp = dn.replaceAll("\"", "").trim();
X500Principal su = new X500Principal(sp);
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suDNs.add(su);
LOGGER.info("SU: " + su.getName());
}
}
}
/**
* Determines the caller subject before passing the request to the
* DelegationServlet.
*
* @param request
* servlet request
* @param response
* servlet response
*/
@Override
protected void service(final HttpServletRequest request,
final HttpServletResponse response) throws IOException
{
WebServiceLogInfo logInfo = new ServletLogInfo(request);
LOGGER.info(logInfo.start());
long start = System.currentTimeMillis();
try
{
final Subject currentSubject = createSubject(request);
logInfo.setSubject(currentSubject);
Subject.doAs(currentSubject,
new PrivilegedExceptionAction<Object>()
{
public Object run() throws IOException
{
handleService(request, response);
return null; // nothing to return
}
});
}
catch (Throwable t)
{
LOGGER.debug(t);
if (t instanceof PrivilegedActionException)
{
t = ((PrivilegedActionException)t).getCause();
LOGGER.debug(t);
}
logInfo.setMessage(t.getMessage());
logInfo.setSuccess(false);
if (t instanceof AccessControlException)
{
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
response.getWriter().println("Unauthorized");
}
else if (t instanceof IllegalArgumentException)
{
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
response.getWriter().println("Bad Request: " + t.getMessage());
}
else
{
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
response.getWriter().println("Internal Error: " + t.getMessage());
}
}
finally
{
logInfo.setElapsedTime(System.currentTimeMillis() - start);
LOGGER.info(logInfo.end());
}
}
private void handleService(HttpServletRequest request,
HttpServletResponse response) throws IOException
{
super.service(request, response);
}
/**
* Create a subject, and add all of the X509 Principals into it.
*
* @param request
* The Request to create from.
* @return An instance of a Subject.
*/
@SuppressWarnings("unchecked")
private Subject createSubject(final HttpServletRequest request)
{
X509Certificate[] ca = (X509Certificate[]) request
.getAttribute("javax.servlet.request.X509Certificate");
Collection<X509Certificate> certs = null;
if (ca != null && ca.length > 0)
certs = Arrays.asList(ca);
// only ssl connections accepted (no remote user)
Subject callerSubject = AuthenticationUtil.getSubject(request);
Subject ret = callerSubject;
// check whether user is superuser executing something on users
// behalf
String userDN = request.getParameter("DN");
if (userDN != null)
{
Set<X500Principal> authPS = callerSubject.getPrincipals(X500Principal.class);
boolean isSU = false;
for (X500Principal caller : authPS)
{
for (X500Principal suDN : suDNs)
{
if (AuthenticationUtil.equals(caller, suDN))
{
// super user doing something on users behalf
// build and return a different subject
isSU = true;
}
}
}
if (isSU)
{
X500Principal delegatedPrinc = new X500Principal(userDN);
ret = new Subject();
ret.getPrincipals().add(delegatedPrinc);
LOGGER.debug("Superuser ... access on behalf of user " + userDN);
}
else
{
throw new AccessControlException("create certficate for " + userDN);
}
}
return ret;
}
}