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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.security;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.X509Certificate;
import java.util.List;
import static java.util.Collections.singletonList;
/**
* @author bjorncs
*/
public class SslContextBuilder {
private KeyStoreSupplier trustStoreSupplier;
private KeyStoreSupplier keyStoreSupplier;
private char[] keyStorePassword;
private TrustManagersFactory trustManagersFactory = SslContextBuilder::createDefaultTrustManagers;
public SslContextBuilder() {}
public SslContextBuilder withTrustStore(Path file, KeyStoreType trustStoreType) {
this.trustStoreSupplier = () -> KeyStoreBuilder.withType(trustStoreType).fromFile(file).build();
return this;
}
public SslContextBuilder withTrustStore(KeyStore trustStore) {
this.trustStoreSupplier = () -> trustStore;
return this;
}
public SslContextBuilder withTrustStore(X509Certificate caCertificate) {
return withTrustStore(singletonList(caCertificate));
}
public SslContextBuilder withTrustStore(List<X509Certificate> caCertificates) {
this.trustStoreSupplier = () -> createTrustStore(caCertificates);
return this;
}
public SslContextBuilder withTrustStore(Path pemEncodedCaCertificates) {
this.trustStoreSupplier = () -> {
List<X509Certificate> caCertificates =
X509CertificateUtils.certificateListFromPem(new String(Files.readAllBytes(pemEncodedCaCertificates)));
return createTrustStore(caCertificates);
};
return this;
}
public SslContextBuilder withKeyStore(PrivateKey privateKey, X509Certificate certificate) {
char[] pwd = new char[0];
this.keyStoreSupplier = () -> KeyStoreBuilder.withType(KeyStoreType.JKS).withKeyEntry("default", privateKey, certificate).build();
this.keyStorePassword = pwd;
return this;
}
public SslContextBuilder withKeyStore(KeyStore keyStore, char[] password) {
this.keyStoreSupplier = () -> keyStore;
this.keyStorePassword = password;
return this;
}
public SslContextBuilder withKeyStore(Path file, char[] password, KeyStoreType keyStoreType) {
this.keyStoreSupplier = () -> KeyStoreBuilder.withType(keyStoreType).fromFile(file, password).build();
this.keyStorePassword = password;
return this;
}
public SslContextBuilder withKeyStore(Path privateKeyPemFile, Path certificatesPemFile) {
this.keyStoreSupplier =
() -> {
PrivateKey privateKey = KeyUtils.fromPemEncodedPrivateKey(new String(Files.readAllBytes(privateKeyPemFile)));
List<X509Certificate> certificates = X509CertificateUtils.certificateListFromPem(new String(Files.readAllBytes(certificatesPemFile)));
return KeyStoreBuilder.withType(KeyStoreType.JKS)
.withKeyEntry("default", privateKey, certificates)
.build();
};
this.keyStorePassword = new char[0];
return this;
}
public SslContextBuilder withTrustManagerFactory(TrustManagersFactory trustManagersFactory) {
this.trustManagersFactory = trustManagersFactory;
return this;
}
public SSLContext build() {
try {
SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
TrustManager[] trustManagers =
trustStoreSupplier != null ? createTrustManagers(trustManagersFactory, trustStoreSupplier) : null;
KeyManager[] keyManagers =
keyStoreSupplier != null ? createKeyManagers(keyStoreSupplier, keyStorePassword) : null;
sslContext.init(keyManagers, trustManagers, null);
return sslContext;
} catch (GeneralSecurityException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private static TrustManager[] createTrustManagers(TrustManagersFactory trustManagersFactory, KeyStoreSupplier trustStoreSupplier)
throws GeneralSecurityException, IOException {
KeyStore truststore = trustStoreSupplier.get();
return trustManagersFactory.createTrustManagers(truststore);
}
private static TrustManager[] createDefaultTrustManagers(KeyStore truststore) throws GeneralSecurityException {
TrustManagerFactory trustManagerFactory =
TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
trustManagerFactory.init(truststore);
return trustManagerFactory.getTrustManagers();
}
private static KeyManager[] createKeyManagers(KeyStoreSupplier keyStoreSupplier, char[] password)
throws GeneralSecurityException, IOException {
KeyManagerFactory keyManagerFactory =
KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
keyManagerFactory.init(keyStoreSupplier.get(), password);
return keyManagerFactory.getKeyManagers();
}
private static KeyStore createTrustStore(List<X509Certificate> caCertificates) {
KeyStoreBuilder trustStoreBuilder = KeyStoreBuilder.withType(KeyStoreType.JKS);
for (int i = 0; i < caCertificates.size(); i++) {
trustStoreBuilder.withCertificateEntry("cert-" + i, caCertificates.get(i));
}
return trustStoreBuilder.build();
}
private interface KeyStoreSupplier {
KeyStore get() throws IOException, GeneralSecurityException;
}
/**
* A factory interface that is similar to {@link TrustManagerFactory}, but is an interface instead of a class.
*/
@FunctionalInterface
public interface TrustManagersFactory {
TrustManager[] createTrustManagers(KeyStore truststore) throws GeneralSecurityException;
}
}
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