/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.security.net.config;
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import android.content.Context;
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import android.util.ArraySet;
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import libcore.io.IoUtils;
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import java.io.InputStream;
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import java.security.cert.Certificate;
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import java.security.cert.CertificateException;
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import java.security.cert.CertificateFactory;
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import java.security.cert.X509Certificate;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Set;
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import com.android.org.conscrypt.TrustedCertificateIndex;
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/**
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* {@link CertificateSource} based on certificates contained in an application resource file.
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* @hide
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*/
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public class ResourceCertificateSource implements CertificateSource {
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private final Object mLock = new Object();
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private final int mResourceId;
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private Set<X509Certificate> mCertificates;
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private Context mContext;
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private TrustedCertificateIndex mIndex;
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public ResourceCertificateSource(int resourceId, Context context) {
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mResourceId = resourceId;
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mContext = context;
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}
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private void ensureInitialized() {
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synchronized (mLock) {
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if (mCertificates != null) {
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return;
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}
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Set<X509Certificate> certificates = new ArraySet<X509Certificate>();
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Collection<? extends Certificate> certs;
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InputStream in = null;
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try {
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CertificateFactory factory = CertificateFactory.getInstance("X.509");
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in = mContext.getResources().openRawResource(mResourceId);
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certs = factory.generateCertificates(in);
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} catch (CertificateException e) {
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throw new RuntimeException("Failed to load trust anchors from id " + mResourceId,
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e);
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} finally {
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IoUtils.closeQuietly(in);
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}
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TrustedCertificateIndex indexLocal = new TrustedCertificateIndex();
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for (Certificate cert : certs) {
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certificates.add((X509Certificate) cert);
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indexLocal.index((X509Certificate) cert);
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}
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mCertificates = certificates;
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mIndex = indexLocal;
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mContext = null;
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}
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}
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@Override
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public Set<X509Certificate> getCertificates() {
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ensureInitialized();
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return mCertificates;
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}
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@Override
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public X509Certificate findBySubjectAndPublicKey(X509Certificate cert) {
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ensureInitialized();
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java.security.cert.TrustAnchor anchor = mIndex.findBySubjectAndPublicKey(cert);
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if (anchor == null) {
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return null;
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}
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return anchor.getTrustedCert();
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}
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@Override
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public X509Certificate findByIssuerAndSignature(X509Certificate cert) {
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ensureInitialized();
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java.security.cert.TrustAnchor anchor = mIndex.findByIssuerAndSignature(cert);
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if (anchor == null) {
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return null;
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}
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return anchor.getTrustedCert();
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}
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@Override
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public Set<X509Certificate> findAllByIssuerAndSignature(X509Certificate cert) {
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ensureInitialized();
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Set<java.security.cert.TrustAnchor> anchors = mIndex.findAllByIssuerAndSignature(cert);
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if (anchors.isEmpty()) {
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return Collections.<X509Certificate>emptySet();
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}
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Set<X509Certificate> certs = new ArraySet<X509Certificate>(anchors.size());
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for (java.security.cert.TrustAnchor anchor : anchors) {
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certs.add(anchor.getTrustedCert());
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}
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return certs;
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}
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@Override
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public void handleTrustStorageUpdate() {
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// Nothing to do, resource sources never change.
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}
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}
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