be.fedict.trust.constraints.CertificatePoliciesCertificateConstraint.java Source code

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Here is the source code for be.fedict.trust.constraints.CertificatePoliciesCertificateConstraint.java

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/*
 * Java Trust Project.
 * Copyright (C) 2009 FedICT.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version
 * 3.0 as published by the Free Software Foundation.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, see 
 * http://www.gnu.org/licenses/.
 */

package be.fedict.trust.constraints;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.cert.X509Certificate;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.x509.PolicyInformation;
import org.bouncycastle.asn1.x509.X509Extensions;

import be.fedict.trust.CertificateConstraint;

/**
 * Certificate Policies certificate constraint implementation.
 * 
 * @author Frank Cornelis
 * 
 */
public class CertificatePoliciesCertificateConstraint implements CertificateConstraint {

    private static final Log LOG = LogFactory.getLog(CertificatePoliciesCertificateConstraint.class);

    private Set<String> certificatePolicies;

    /**
     * Default constructor.
     */
    public CertificatePoliciesCertificateConstraint() {
        this.certificatePolicies = new HashSet<String>();
    }

    /**
     * Adds a certificate policy OID to this certificate constraint.
     * 
     * @param certificatePolicy
     */
    public void addCertificatePolicy(String certificatePolicy) {
        this.certificatePolicies.add(certificatePolicy);
    }

    public boolean check(X509Certificate certificate) {
        byte[] extensionValue = certificate.getExtensionValue(X509Extensions.CertificatePolicies.getId());
        if (null == extensionValue) {
            return false;
        }
        ASN1Sequence certPolicies;
        try {
            DEROctetString oct = (DEROctetString) (new ASN1InputStream(new ByteArrayInputStream(extensionValue))
                    .readObject());
            certPolicies = (ASN1Sequence) new ASN1InputStream(oct.getOctets()).readObject();
        } catch (IOException e) {
            throw new RuntimeException("IO error: " + e.getMessage(), e);
        }
        Enumeration<?> certPoliciesEnum = certPolicies.getObjects();
        while (certPoliciesEnum.hasMoreElements()) {
            PolicyInformation policyInfo = PolicyInformation.getInstance(certPoliciesEnum.nextElement());
            DERObjectIdentifier policyOid = policyInfo.getPolicyIdentifier();
            String policyId = policyOid.getId();
            LOG.debug("present policy OID: " + policyId);
            if (this.certificatePolicies.contains(policyId)) {
                LOG.debug("matching certificate policy OID: " + policyId);
                return true;
            }
        }
        return false;
    }
}