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/*
* JBoss, Home of Professional Open Source.
* Copyright 2019 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wildfly.security.ssl;
import javax.net.ssl.CertPathTrustManagerParameters;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509ExtendedTrustManager;
import javax.net.ssl.X509TrustManager;
import javax.security.auth.x500.X500Principal;
import java.io.InputStream;
import java.net.Socket;
import java.net.URI;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.cert.CRL;
import java.security.cert.CertPathBuilder;
import java.security.cert.CertPathValidatorException;
import java.security.cert.CertStore;
import java.security.cert.CertStoreParameters;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.CollectionCertStoreParameters;
import java.security.cert.PKIXBuilderParameters;
import java.security.cert.PKIXCertPathChecker;
import java.security.cert.PKIXReason;
import java.security.cert.PKIXRevocationChecker;
import java.security.cert.X509CertSelector;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Stream;
import static org.wildfly.common.Assert.checkNotNullParam;
/**
* Extension to the {@link X509TrustManager} interface to support OCSP and CRL verification.
*
* @author Martin Mazanek
*/
public class X509RevocationTrustManager extends X509ExtendedTrustManager {
private static final int DEFAULT_MAX_CERT_PATH_LENGTH = 5;
private X509Certificate[] acceptedIssuers;
private final X509TrustManager trustManager;
private X509RevocationTrustManager(Builder builder) {
try {
PKIXBuilderParameters params = new PKIXBuilderParameters(builder.trustStore, new X509CertSelector());
if (builder.crlStreams != null && ! builder.crlStreams.isEmpty()) {
CertStoreParameters csp = new CollectionCertStoreParameters(getCRLs(builder.crlStreams));
CertStore store = CertStore.getInstance("Collection", csp);
params.addCertStore(store);
}
CertPathBuilder cpb = CertPathBuilder.getInstance("PKIX");
PKIXRevocationChecker rc = (PKIXRevocationChecker) cpb.getRevocationChecker();
if (builder.ocspResponderCert != null) {
rc.setOcspResponderCert(builder.ocspResponderCert);
}
EnumSet options = EnumSet.noneOf(PKIXRevocationChecker.Option.class);
if (builder.onlyEndEntity) {
options.add(PKIXRevocationChecker.Option.ONLY_END_ENTITY);
}
if (builder.preferCrls) {
options.add(PKIXRevocationChecker.Option.PREFER_CRLS);
}
if (builder.softFail) {
options.add(PKIXRevocationChecker.Option.SOFT_FAIL);
}
if (builder.noFallback) {
options.add(PKIXRevocationChecker.Option.NO_FALLBACK);
}
rc.setOptions(options);
rc.setOcspResponder(builder.responderUri);
params.setRevocationEnabled(true);
params.addCertPathChecker(rc);
PKIXCertPathChecker maxPathLengthChecker = new MaxPathLengthChecker(builder.maxCertPath);
params.addCertPathChecker(maxPathLengthChecker);
params.setMaxPathLength(builder.maxCertPath);
builder.trustManagerFactory.init(new CertPathTrustManagerParameters(params));
X509TrustManager[] trustManagers = Stream.of(builder.trustManagerFactory.getTrustManagers()).map(trustManager -> trustManager instanceof X509TrustManager ? (X509TrustManager) trustManager : null).filter(Objects::nonNull).toArray(X509TrustManager[]::new);
if (trustManagers.length == 0) {
throw ElytronMessages.log.noDefaultTrustManager();
}
this.trustManager = trustManagers[0];
} catch(GeneralSecurityException e) {
throw ElytronMessages.log.sslErrorCreatingRevocationTrustManager(builder.trustManagerFactory.getAlgorithm(), e);
}
if (builder.acceptedIssuers != null) {
this.acceptedIssuers = builder.acceptedIssuers;
}
}
@Override
public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
trustManager.checkClientTrusted(chain, authType);
}
@Override
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
trustManager.checkServerTrusted(chain, authType);
}
@Override
public void checkClientTrusted(X509Certificate[] chain, String authType, Socket socket) throws CertificateException {
trustManager.checkClientTrusted(chain, authType);
}
@Override
public void checkServerTrusted(X509Certificate[] chain, String authType, Socket socket) throws CertificateException {
trustManager.checkServerTrusted(chain, authType);
}
@Override
public void checkClientTrusted(X509Certificate[] chain, String authType, SSLEngine sslEngine) throws CertificateException {
trustManager.checkClientTrusted(chain, authType);
}
@Override
public void checkServerTrusted(X509Certificate[] chain, String authType, SSLEngine sslEngine) throws CertificateException {
trustManager.checkServerTrusted(chain, authType);
}
@Override
public X509Certificate[] getAcceptedIssuers() {
if (acceptedIssuers != null) {
return acceptedIssuers;
} else {
return this.trustManager.getAcceptedIssuers();
}
}
private Collection getCRLs(List crlStreams) throws GeneralSecurityException {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
Collection crls = new ArrayList<>();
try {
for (InputStream stream : crlStreams) {
crls.addAll(cf.generateCRLs(stream));
}
return crls;
} finally {
for (InputStream stream : crlStreams) {
try {
stream.close();
} catch (Exception ignore) {}
}
}
}
public static class Builder {
private X509Certificate[] acceptedIssuers = null;
private KeyStore trustStore = null;
private TrustManagerFactory trustManagerFactory = null;
private URI responderUri = null;
private List crlStreams = null;
private X509Certificate ocspResponderCert = null;
private int maxCertPath = DEFAULT_MAX_CERT_PATH_LENGTH;
private boolean preferCrls = false;
private boolean onlyEndEntity = false;
private boolean softFail = false;
private boolean noFallback = false;
private Builder() {}
/**
* Set an array of certificate authority certificates which are trusted for authenticating peers (may be {@code null})
*
* @param acceptedIssuers array of accepted issuers
* @return this Builder for subsequent changes
* @deprecated accepted issuers are automatically set when creating the trust manager
*/
@Deprecated
public Builder setAcceptedIssuers(X509Certificate[] acceptedIssuers) {
this.acceptedIssuers = acceptedIssuers;
return this;
}
/**
* Set a {@link KeyStore} with the trusted certificates (must not be {@code null})
*
* @param trustStore keystore with trusted certificates
* @return this Builder for subsequent changes
*/
public Builder setTrustStore(KeyStore trustStore) {
this.trustStore = trustStore;
return this;
}
/**
* Set a {@link TrustManagerFactory}
*
* @param trustManagerFactory the trust manager factory
* @return this Builder for subsequent changes
*/
public Builder setTrustManagerFactory(TrustManagerFactory trustManagerFactory) {
this.trustManagerFactory = trustManagerFactory;
return this;
}
/**
* Set an OCSP Responder {@link URI} to override those extracted from certificates.
*
* @param responderURI the responder URI
* @return this Builder for subsequent changes
*/
public Builder setResponderURI(URI responderURI) {
this.responderUri = responderURI;
return this;
}
/**
* Set the input stream pointing to a certificate revocation list (may be {@code null}). The stream will be automatically closed after the invocation
*
* @param crlStream the input stream
* @return this Builder for subsequent changes
*/
public Builder setCrlStream(InputStream crlStream) {
List crlStreams = new ArrayList();
crlStreams.add(crlStream);
this.crlStreams = crlStreams;
return this;
}
/**
* Set the input streams pointing to certificate revocation lists (may be an empty list). The streams will be
* automatically closed after the invocation
*
* @param crlStreams the input streams
* @return this Builder for subsequent changes
*/
public Builder setCrlStreams(List crlStreams) {
this.crlStreams = crlStreams;
return this;
}
/**
* Set the maximum number of non-self-issued intermediate certificates that may exist in a certification path. The value must be equal or greater than 1.
*
* @param maxCertPath the maximum cert path
* @return this Builder for subsequent changes
*/
public Builder setMaxCertPath(int maxCertPath) {
this.maxCertPath = maxCertPath;
return this;
}
/**
* Set if CRL revocation should be executed before OCSP. Default false
*
* @param preferCrls true if CRLs should be preferred
* @return this Builder for subsequent changes
*/
public Builder setPreferCrls(boolean preferCrls) {
this.preferCrls = preferCrls;
return this;
}
/**
* Set if only leaf certificate revocation should be checked. Default false
*
* @param onlyEndEntity true if only leaf certificate should be checked
* @return this Builder for subsequent changes
*/
public Builder setOnlyEndEntity(boolean onlyEndEntity) {
this.onlyEndEntity = onlyEndEntity;
return this;
}
/**
* Set if certificate should be allowed in case the revocation status cannot be obtained. Default false
*
* @param softFail true if unknown revocation status is accepted
* @return this Builder for subsequent changes
*/
public Builder setSoftFail(boolean softFail) {
this.softFail = softFail;
return this;
}
/**
* Set if only one method of obtaining revocation status should be used. Default false
*
* @param noFallback true if only one method of obtaining revocation status should be used
* @return this Builder for subsequent changes
*/
public Builder setNoFallback(boolean noFallback) {
this.noFallback = noFallback;
return this;
}
/**
* Set OCSP responder's certificate. By default issuer certificate of certificate being validated is used.
*
* @param ocspResponderCert OCSP responder certificate
* @return this Builder for subsequent changes
*/
public Builder setOcspResponderCert(X509Certificate ocspResponderCert) {
this.ocspResponderCert = ocspResponderCert;
return this;
}
public X509RevocationTrustManager build() {
checkNotNullParam("trustStore", trustStore);
checkNotNullParam("trustManagerFactory", trustManagerFactory);
return new X509RevocationTrustManager(this);
}
}
/**
* Create new X509RevocationTtustManager.Builder instance
* @return new Builder instance
*/
public static Builder builder() {
return new Builder();
}
/**
* PKIXCertPathChecker to check if a cert path being validated is longer than maxPathLength specified
*/
private class MaxPathLengthChecker extends PKIXCertPathChecker {
private int maxPathLength;
private int i;
MaxPathLengthChecker(int maxPathLength) {
this.maxPathLength = maxPathLength;
}
/*
* Initialize checker
*/
public void init(boolean forward) {
i = 0;
}
@Override
public boolean isForwardCheckingSupported() {
return false;
}
@Override
public Set getSupportedExtensions() {
return null;
}
public void check(Certificate cert, Collection unresolvedCritExts)
throws CertPathValidatorException {
X509Certificate currCert = (X509Certificate) cert;
i++;
checkCertPathLength(currCert);
}
private void checkCertPathLength(X509Certificate currCert) throws CertPathValidatorException {
X500Principal subject = currCert.getSubjectX500Principal();
X500Principal issuer = currCert.getIssuerX500Principal();
int pathLenConstraint = -1;
if (currCert.getVersion() < 3) { // version 1 or version 2
if (i == 1 && subject.equals(issuer)) {
pathLenConstraint = Integer.MAX_VALUE;
}
} else {
pathLenConstraint = currCert.getBasicConstraints();
}
if (pathLenConstraint == -1) {
pathLenConstraint = maxPathLength;
}
if (!subject.equals(issuer) && pathLenConstraint < i) {
throw new CertPathValidatorException
("check failed: pathLenConstraint violated - "
+ "this cert must be the last cert in the "
+ "certification path", null, null, -1,
PKIXReason.PATH_TOO_LONG);
}
if (pathLenConstraint < maxPathLength)
maxPathLength = pathLenConstraint;
}
}
}
