/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.wss4j.common.crypto;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.CertPath;
import java.security.cert.CertPathValidator;
import java.security.cert.CertificateEncodingException;
import java.security.cert.PKIXParameters;
import java.security.cert.TrustAnchor;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.x500.X500Principal;
import org.apache.wss4j.common.ext.WSSecurityException;
/**
* A Crypto implementation based on a simple array of X509Certificate(s). PrivateKeys are not
* supported, so this cannot be used for signature creation, or decryption.
*/
public class CertificateStore extends CryptoBase {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger(CertificateStore.class);
private X509Certificate[] trustedCerts;
/**
* Constructor
*/
public CertificateStore(X509Certificate[] trustedCerts) {
this.trustedCerts = trustedCerts;
}
/**
* Get an X509Certificate (chain) corresponding to the CryptoType argument. The supported
* types are as follows:
*
* TYPE.ISSUER_SERIAL - A certificate (chain) is located by the issuer name and serial number
* TYPE.THUMBPRINT_SHA1 - A certificate (chain) is located by the SHA1 of the (root) cert
* TYPE.SKI_BYTES - A certificate (chain) is located by the SKI bytes of the (root) cert
* TYPE.SUBJECT_DN - A certificate (chain) is located by the Subject DN of the (root) cert
* TYPE.ALIAS - A certificate (chain) is located by an alias. In this case, it duplicates the
* TYPE.SUBJECT_DN functionality.
*/
public X509Certificate[] getX509Certificates(CryptoType cryptoType) throws WSSecurityException {
if (cryptoType == null) {
return null;
}
CryptoType.TYPE type = cryptoType.getType();
X509Certificate[] certs = null;
switch (type) {
case ISSUER_SERIAL: {
certs = getX509Certificates(cryptoType.getIssuer(), cryptoType.getSerial());
break;
}
case THUMBPRINT_SHA1: {
certs = getX509Certificates(cryptoType.getBytes());
break;
}
case SKI_BYTES: {
certs = getX509CertificatesSKI(cryptoType.getBytes());
break;
}
case ALIAS:
case SUBJECT_DN: {
certs = getX509CertificatesSubjectDN(cryptoType.getSubjectDN());
break;
}
case ENDPOINT: {
break;
}
}
return certs;
}
/**
* Get the implementation-specific identifier corresponding to the cert parameter. In this
* case, the identifier refers to the subject DN.
* @param cert The X509Certificate for which to search for an identifier
* @return the identifier corresponding to the cert parameter
* @throws WSSecurityException
*/
public String getX509Identifier(X509Certificate cert) throws WSSecurityException {
return cert.getSubjectDN().toString();
}
/**
* Gets the private key corresponding to the certificate. Not supported.
*
* @param certificate The X509Certificate corresponding to the private key
* @param callbackHandler The callbackHandler needed to get the password
* @return The private key
*/
public PrivateKey getPrivateKey(
X509Certificate certificate, CallbackHandler callbackHandler
) throws WSSecurityException {
return null;
}
/**
* Gets the private key corresponding to the identifier. Not supported.
*
* @param identifier The implementation-specific identifier corresponding to the key
* @param password The password needed to get the key
* @return The private key
*/
public PrivateKey getPrivateKey(
String identifier,
String password
) throws WSSecurityException {
return null;
}
/**
* Evaluate whether a given certificate chain should be trusted.
*
* @param certs Certificate chain to validate
* @param enableRevocation whether to enable CRL verification or not
* @throws WSSecurityException if the certificate chain is invalid
*/
public void verifyTrust(
X509Certificate[] certs,
boolean enableRevocation
) throws WSSecurityException {
//
// FIRST step - Search the trusted certs for the transmitted certificate
//
if (!enableRevocation) {
String issuerString = certs[0].getIssuerX500Principal().getName();
BigInteger issuerSerial = certs[0].getSerialNumber();
CryptoType cryptoType = new CryptoType(CryptoType.TYPE.ISSUER_SERIAL);
cryptoType.setIssuerSerial(issuerString, issuerSerial);
X509Certificate[] foundCerts = getX509Certificates(cryptoType);
//
// If a certificate has been found, the certificates must be compared
// to ensure against phony DNs (compare encoded form including signature)
//
if (foundCerts != null && foundCerts[0] != null && foundCerts[0].equals(certs[0])) {
if (LOG.isDebugEnabled()) {
LOG.debug(
"Direct trust for certificate with " + certs[0].getSubjectX500Principal().getName()
);
}
return;
}
}
//
// SECOND step - Search for the issuer cert (chain) of the transmitted certificate in the
// keystore or the truststore
//
CryptoType cryptoType = new CryptoType(CryptoType.TYPE.SUBJECT_DN);
String issuerString = certs[0].getIssuerX500Principal().getName();
cryptoType.setSubjectDN(issuerString);
X509Certificate[] foundCerts = getX509Certificates(cryptoType);
// If the certs have not been found, the issuer is not in the keystore/truststore
// As a direct result, do not trust the transmitted certificate
if (foundCerts == null || foundCerts.length < 1) {
String subjectString = certs[0].getSubjectX500Principal().getName();
if (LOG.isDebugEnabled()) {
LOG.debug(
"No certs found in keystore for issuer " + issuerString
+ " of certificate for " + subjectString
);
}
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "certpath", "No trusted certs found"
);
}
//
// THIRD step
// Check the certificate trust path for the issuer cert chain
//
if (LOG.isDebugEnabled()) {
LOG.debug(
"Preparing to validate certificate path for issuer " + issuerString
);
}
//
// Form a certificate chain from the transmitted certificate
// and the certificate(s) of the issuer from the keystore/truststore
//
X509Certificate[] x509certs = new X509Certificate[foundCerts.length + 1];
x509certs[0] = certs[0];
System.arraycopy(foundCerts, 0, x509certs, 1, foundCerts.length);
try {
// Generate cert path
List<X509Certificate> certList = Arrays.asList(x509certs);
CertPath path = getCertificateFactory().generateCertPath(certList);
Set<TrustAnchor> set = new HashSet<TrustAnchor>();
if (trustedCerts != null) {
for (X509Certificate cert : trustedCerts) {
TrustAnchor anchor =
new TrustAnchor(cert, cert.getExtensionValue(NAME_CONSTRAINTS_OID));
set.add(anchor);
}
}
PKIXParameters param = new PKIXParameters(set);
param.setRevocationEnabled(enableRevocation);
// Verify the trust path using the above settings
String provider = getCryptoProvider();
CertPathValidator validator = null;
if (provider == null || provider.length() == 0) {
validator = CertPathValidator.getInstance("PKIX");
} else {
validator = CertPathValidator.getInstance("PKIX", provider);
}
validator.validate(path, param);
} catch (java.security.NoSuchProviderException e) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "certpath", e,
e.getMessage()
);
} catch (NoSuchAlgorithmException e) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "certpath", e,
e.getMessage()
);
} catch (java.security.cert.CertificateException e) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "certpath", e,
e.getMessage()
);
} catch (java.security.InvalidAlgorithmParameterException e) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "certpath", e,
e.getMessage()
);
} catch (java.security.cert.CertPathValidatorException e) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "certpath", e,
e.getMessage()
);
}
}
/**
* Evaluate whether a given public key should be trusted.
*
* @param publicKey The PublicKey to be evaluated
* @throws WSSecurityException if the PublicKey is invalid
*/
public void verifyTrust(PublicKey publicKey) throws WSSecurityException {
//
// If the public key is null, do not trust the signature
//
if (publicKey == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
}
//
// Search the trusted certs for the transmitted public key (direct trust)
//
for (X509Certificate trustedCert : trustedCerts) {
if (publicKey.equals(trustedCert.getPublicKey())) {
return;
}
}
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
}
/**
* Get an X509 Certificate (chain) according to a given serial number and issuer string.
*
* @param issuer The Issuer String
* @param serialNumber The serial number of the certificate
* @return the X509 Certificate (chain) that was found
* @throws WSSecurityException
*/
private X509Certificate[] getX509Certificates(
String issuer,
BigInteger serialNumber
) throws WSSecurityException {
//
// Convert the subject DN to a java X500Principal object first. This is to ensure
// interop with a DN constructed from .NET, where e.g. it uses "S" instead of "ST".
// Then convert it to a BouncyCastle X509Name, which will order the attributes of
// the DN in a particular way (see WSS-168). If the conversion to an X500Principal
// object fails (e.g. if the DN contains "E" instead of "EMAILADDRESS"), then fall
// back on a direct conversion to a BC X509Name
//
Object issuerName = null;
try {
X500Principal issuerRDN = new X500Principal(issuer);
issuerName = createBCX509Name(issuerRDN.getName());
} catch (java.lang.IllegalArgumentException ex) {
issuerName = createBCX509Name(issuer);
}
for (X509Certificate trustedCert : trustedCerts) {
if (trustedCert.getSerialNumber().compareTo(serialNumber) == 0) {
Object certName =
createBCX509Name(trustedCert.getIssuerX500Principal().getName());
if (certName.equals(issuerName)) {
return new X509Certificate[]{trustedCert};
}
}
}
return null;
}
/**
* Get an X509 Certificate (chain) according to a given Thumbprint.
*
* @param thumb The SHA1 thumbprint info bytes
* @return the X509 certificate (chain) that was found (can be null)
* @throws WSSecurityException if problems during keystore handling or wrong certificate
*/
private X509Certificate[] getX509Certificates(byte[] thumb) throws WSSecurityException {
MessageDigest sha = null;
if (trustedCerts == null) {
return null;
}
try {
sha = MessageDigest.getInstance("SHA1");
} catch (NoSuchAlgorithmException e) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE, "decoding.general", e
);
}
for (X509Certificate trustedCert : trustedCerts) {
try {
sha.update(trustedCert.getEncoded());
} catch (CertificateEncodingException ex) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.SECURITY_TOKEN_UNAVAILABLE, "encodeError", ex
);
}
byte[] data = sha.digest();
if (Arrays.equals(data, thumb)) {
return new X509Certificate[]{trustedCert};
}
}
return null;
}
/**
* Get an X509 Certificate (chain) according to a given SubjectKeyIdentifier.
*
* @param skiBytes The SKI bytes
* @return the X509 certificate (chain) that was found (can be null)
*/
private X509Certificate[] getX509CertificatesSKI(byte[] skiBytes) throws WSSecurityException {
if (trustedCerts == null) {
return null;
}
for (X509Certificate trustedCert : trustedCerts) {
byte[] data = getSKIBytesFromCert(trustedCert);
if (data.length == skiBytes.length && Arrays.equals(data, skiBytes)) {
return new X509Certificate[]{trustedCert};
}
}
return null;
}
/**
* Get an X509 Certificate (chain) according to a given DN of the subject of the certificate
*
* @param subjectDN The DN of subject to look for
* @return An X509 Certificate (chain) with the same DN as given in the parameters
* @throws WSSecurityException
*/
private X509Certificate[] getX509CertificatesSubjectDN(String subjectDN)
throws WSSecurityException {
//
// Convert the subject DN to a java X500Principal object first. This is to ensure
// interop with a DN constructed from .NET, where e.g. it uses "S" instead of "ST".
// Then convert it to a BouncyCastle X509Name, which will order the attributes of
// the DN in a particular way (see WSS-168). If the conversion to an X500Principal
// object fails (e.g. if the DN contains "E" instead of "EMAILADDRESS"), then fall
// back on a direct conversion to a BC X509Name
//
Object subject;
try {
X500Principal subjectRDN = new X500Principal(subjectDN);
subject = createBCX509Name(subjectRDN.getName());
} catch (java.lang.IllegalArgumentException ex) {
subject = createBCX509Name(subjectDN);
}
if (trustedCerts != null) {
for (X509Certificate trustedCert : trustedCerts) {
X500Principal foundRDN = trustedCert.getSubjectX500Principal();
Object certName = createBCX509Name(foundRDN.getName());
if (subject.equals(certName)) {
return new X509Certificate[]{trustedCert};
}
}
}
return null;
}
}