/*
* 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.brooklyn.util.crypto;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.NoSuchElementException;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import javax.security.auth.x500.X500Principal;
import org.apache.brooklyn.util.exceptions.Exceptions;
/**
* Utility methods for generating and working with keys, with no BC dependencies
*/
public class SecureKeysWithoutBouncyCastle {
private static KeyPairGenerator defaultKeyPairGenerator = newKeyPairGenerator("RSA", 1024);
protected SecureKeysWithoutBouncyCastle() {}
public static KeyPairGenerator newKeyPairGenerator(String algorithm, int bits) {
KeyPairGenerator keyPairGenerator;
try {
keyPairGenerator = KeyPairGenerator.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
throw Exceptions.propagate(e);
}
keyPairGenerator.initialize(bits);
return keyPairGenerator;
}
public static KeyPair newKeyPair() {
return defaultKeyPairGenerator.generateKeyPair();
}
public static KeyPair newKeyPair(String algorithm, int bits) {
return newKeyPairGenerator(algorithm, bits).generateKeyPair();
}
/** returns a new keystore, of the default type, and initialized to be empty.
* (everyone always forgets to load(null,null).) */
public static KeyStore newKeyStore() {
try {
KeyStore store = KeyStore.getInstance(KeyStore.getDefaultType());
store.load(null, null);
return store;
} catch (Exception e) {
throw Exceptions.propagate(e);
}
}
/** returns keystore of default type read from given source */
public static KeyStore newKeyStore(InputStream source, String passphrase) {
try {
KeyStore store = KeyStore.getInstance(KeyStore.getDefaultType());
store.load(source, passphrase!=null ? passphrase.toCharArray() : new char[0]);
return store;
} catch (Exception e) {
throw Exceptions.propagate(e);
}
}
/** see {@link #getTrustManager(KeyStore, Class)}, matching any type */
public static TrustManager getTrustManager(KeyStore trustStore) {
return getTrustManager(trustStore, null);
}
/** returns the trust manager inferred from trustStore, matching the type (if not null);
* throws exception if there are none, or if there are multiple */
@SuppressWarnings("unchecked")
public static <T extends TrustManager> T getTrustManager(KeyStore trustStore, Class<T> type) {
try {
TrustManagerFactory tmf = TrustManagerFactory.getInstance(
TrustManagerFactory.getDefaultAlgorithm());
tmf.init(trustStore);
T result = null;
for (TrustManager tm: tmf.getTrustManagers()) {
if (type==null || type.isInstance(tm)) {
if (result!=null)
throw new IllegalStateException("Multiple trust managers matching "+type+" inferred from "+trustStore);
result = (T)tm;
}
}
if (result!=null)
return result;
throw new NoSuchElementException("No trust manager matching "+type+" can be inferred from "+trustStore);
} catch (Exception e) {
throw Exceptions.propagate(e);
}
}
public static X509TrustManager getTrustManager(X509Certificate certificate) {
try {
KeyStore ks = newKeyStore();
ks.setCertificateEntry("", certificate);
return getTrustManager(ks, X509TrustManager.class);
} catch (KeyStoreException e) {
throw Exceptions.propagate(e);
}
}
/** converts a certificate to the canonical implementation, commonly sun.security.x509.X509CertImpl,
* which is required in some places -- the Bouncy Castle X509 impl is not accepted
* (e.g. where certs are chained, passed to trust manager) */
public static X509Certificate getCanonicalImpl(X509Certificate inCert) {
try {
KeyStore store = newKeyStore();
store.setCertificateEntry("to-canonical", inCert);
ByteArrayOutputStream out = new ByteArrayOutputStream();
store.store(out, "".toCharArray());
KeyStore store2 = KeyStore.getInstance(KeyStore.getDefaultType());
store2.load(new ByteArrayInputStream(out.toByteArray()), "".toCharArray());
return (X509Certificate) store2.getCertificate("to-canonical");
} catch (Exception e) {
throw Exceptions.propagate(e);
}
}
public static boolean isCertificateAuthorizedBy(X509Certificate candidate, X509Certificate authority) {
try {
candidate = getCanonicalImpl(candidate);
getTrustManager(authority).checkClientTrusted(new X509Certificate[] { candidate }, "RSA");
return true;
} catch (CertificateException e) {
return false;
}
}
public static X500Principal getX500PrincipalWithCommonName(String commonName) {
return new X500Principal("" + "C=None," + "L=None," + "O=None," + "OU=None," + "CN=" + commonName);
}
}