/*******************************************************************************
* Copyright (c) 2007, 2008 IBM Corporation and others. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors: IBM Corporation - initial API and implementation
******************************************************************************/
package org.eclipse.osgi.internal.signedcontent;
import java.security.cert.Certificate;
import java.util.HashSet;
import java.util.Iterator;
import org.eclipse.osgi.baseadaptor.BaseData;
import org.eclipse.osgi.framework.internal.core.*;
import org.eclipse.osgi.framework.log.FrameworkLogEntry;
import org.eclipse.osgi.internal.provisional.service.security.AuthorizationEngine;
import org.eclipse.osgi.signedcontent.SignerInfo;
import org.osgi.framework.*;
import org.osgi.framework.Constants;
import org.osgi.service.packageadmin.PackageAdmin;
import org.osgi.util.tracker.ServiceTracker;
public class TrustEngineListener {
// this is a singleton listener; see SignedBundleHook for initialization
private volatile static TrustEngineListener instance;
private final BundleContext context;
private final ServiceTracker authorizationTracker;
TrustEngineListener(BundleContext context) {
this.context = context;
// read the trust provider security property
String authEngineProp = FrameworkProperties.getProperty(SignedContentConstants.AUTHORIZATION_ENGINE);
Filter filter = null;
if (authEngineProp != null)
try {
filter = FilterImpl.newInstance("(&(" + Constants.OBJECTCLASS + "=" + AuthorizationEngine.class.getName() + ")(" + SignedContentConstants.AUTHORIZATION_ENGINE + "=" + authEngineProp + "))"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$//$NON-NLS-5$
} catch (InvalidSyntaxException e) {
SignedBundleHook.log("Invalid authorization filter", FrameworkLogEntry.WARNING, e); //$NON-NLS-1$
}
if (filter != null)
authorizationTracker = new ServiceTracker(context, filter, null);
else
authorizationTracker = new ServiceTracker(context, AuthorizationEngine.class.getName(), null);
authorizationTracker.open();
instance = this;
}
public static TrustEngineListener getInstance() {
return instance;
}
void stopTrustEngineListener() {
authorizationTracker.close();
instance = null;
}
public void addedTrustAnchor(Certificate anchor) {
// find any SignedContent with SignerInfos that do not have an anchor;
// re-evaluate trust and check authorization for these SignedContents
Bundle[] bundles = context.getBundles();
HashSet unresolved = new HashSet();
for (int i = 0; i < bundles.length; i++) {
SignedContentImpl signedContent = getSignedContent(bundles[i]);
if (signedContent != null && signedContent.isSigned()) {
// check the SignerInfos for this content
SignerInfo[] infos = signedContent.getSignerInfos();
for (int j = 0; j < infos.length; j++) {
if (infos[j].getTrustAnchor() == null)
// one of the signers is not trusted
unresolved.add(bundles[i]);
SignerInfo tsa = signedContent.getTSASignerInfo(infos[j]);
if (tsa != null && tsa.getTrustAnchor() == null)
// one of the tsa signers is not trusted
unresolved.add(bundles[i]);
}
}
if (unresolved.contains(bundles[i])) {
// found an untrusted signer for this bundle re-evaluate trust
SignedBundleFile.determineTrust(signedContent, SignedBundleHook.VERIFY_TRUST);
// now check the authorization handler
checkAuthorization(signedContent, bundles[i]);
}
}
// try to resolve
if (unresolved.size() > 0)
resolveBundles((Bundle[]) unresolved.toArray(new Bundle[unresolved.size()]), false);
}
private void checkAuthorization(SignedContentImpl signedContent, Bundle bundle) {
AuthorizationEngine authEngine = getAuthorizationEngine();
if (authEngine != null)
authEngine.authorize(signedContent, bundle);
}
AuthorizationEngine getAuthorizationEngine() {
return (AuthorizationEngine) authorizationTracker.getService();
}
private void resolveBundles(Bundle[] bundles, boolean refresh) {
ServiceReference ref = context.getServiceReference(PackageAdmin.class.getName());
if (ref == null)
return;
PackageAdmin pa = (PackageAdmin) context.getService(ref);
if (pa == null)
return;
try {
if (refresh)
pa.refreshPackages(bundles);
else
pa.resolveBundles(bundles);
} finally {
context.ungetService(ref);
}
}
public void removedTrustAnchor(Certificate anchor) {
// find any signed content that has signerinfos with the supplied anchor
// re-evaluate trust and check authorization again.
Bundle[] bundles = context.getBundles();
HashSet usingAnchor = new HashSet();
HashSet untrustedSigners = new HashSet();
for (int i = 0; i < bundles.length; i++) {
SignedContentImpl signedContent = getSignedContent(bundles[i]);
if (signedContent != null && signedContent.isSigned()) {
// check signer infos for this content
SignerInfo[] infos = signedContent.getSignerInfos();
for (int j = 0; j < infos.length; j++) {
if (anchor.equals(infos[j].getTrustAnchor())) {
// one of the signers uses this anchor
untrustedSigners.add(infos[j]);
usingAnchor.add(bundles[i]);
}
SignerInfo tsa = signedContent.getTSASignerInfo(infos[j]);
if (tsa != null && anchor.equals(tsa.getTrustAnchor())) {
// one of the tsa signers uses this anchor
usingAnchor.add(bundles[i]);
untrustedSigners.add(tsa);
}
}
}
}
// remove trust anchors from untrusted signers
for (Iterator untrusted = untrustedSigners.iterator(); untrusted.hasNext();)
((SignerInfoImpl) untrusted.next()).setTrustAnchor(null);
// re-establish trust and check authorization
for (Iterator untrustedBundles = usingAnchor.iterator(); untrustedBundles.hasNext();) {
Bundle bundle = (Bundle) untrustedBundles.next();
SignedContentImpl signedContent = getSignedContent(bundle);
// found an signer using the anchor for this bundle re-evaluate trust
SignedBundleFile.determineTrust(signedContent, SignedBundleHook.VERIFY_TRUST);
// now check the authorization handler
checkAuthorization(signedContent, bundle);
}
// TODO an optimization here would be to check for real DisabledInfo objects for each bundle
// try to refresh
if (usingAnchor.size() > 0)
resolveBundles((Bundle[]) usingAnchor.toArray(new Bundle[usingAnchor.size()]), true);
}
private SignedContentImpl getSignedContent(Bundle bundle) {
BaseData data = (BaseData) ((AbstractBundle) bundle).getBundleData();
SignedStorageHook hook = (SignedStorageHook) data.getStorageHook(SignedStorageHook.KEY);
if (hook == null)
return null;
return (SignedContentImpl) hook.getSignedContent();
}
}