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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.feed.client.impl;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
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.nio.file.Files;
import java.nio.file.Path;
import java.security.GeneralSecurityException;
import java.security.KeyFactory;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
/**
* BouncyCastle integration for creating a {@link SSLContext} instance from PEM encoded material
*
* @author bjorncs
*/
class SslContextBuilder {
static final BouncyCastleProvider bcProvider = new BouncyCastleProvider();
private Path certificateFile;
private Path privateKeyFile;
private Path caCertificatesFile;
private Collection<X509Certificate> certificate;
private PrivateKey privateKey;
private Collection<X509Certificate> caCertificates;
SslContextBuilder withCertificateAndKey(Path certificate, Path privateKey) {
this.certificateFile = certificate;
this.privateKeyFile = privateKey;
return this;
}
SslContextBuilder withCertificateAndKey(Collection<X509Certificate> certificate, PrivateKey privateKey) {
this.certificate = certificate;
this.privateKey = privateKey;
return this;
}
SslContextBuilder withCaCertificates(Path caCertificates) {
this.caCertificatesFile = caCertificates;
return this;
}
SslContextBuilder withCaCertificates(Collection<X509Certificate> caCertificates) {
this.caCertificates = caCertificates;
return this;
}
SSLContext build() throws IOException {
try {
KeyStore keystore = KeyStore.getInstance("PKCS12");
keystore.load(null);
if (hasCertificateFile()) {
keystore.setKeyEntry("cert", privateKey(privateKeyFile), new char[0], certificates(certificateFile));
} else if (hasCertificateInstance()) {
keystore.setKeyEntry("cert", privateKey, new char[0], certificate.toArray(new Certificate[0]));
}
if (hasCaCertificateFile()) {
addCaCertificates(keystore, Arrays.asList(certificates(caCertificatesFile)));
} else if (hasCaCertificateInstance()) {
addCaCertificates(keystore, caCertificates);
}
// Protocol version must be equal to TlsContext.SSL_CONTEXT_VERSION or higher
SSLContext sslContext = SSLContext.getInstance("TLSv1.3");
sslContext.init(
createKeyManagers(keystore).orElse(null),
createTrustManagers(keystore).orElse(null),
/*Default secure random algorithm*/null);
return sslContext;
} catch (GeneralSecurityException e) {
throw new IOException(e);
}
}
private boolean hasCertificateFile() { return certificateFile != null && privateKeyFile != null; }
private boolean hasCertificateInstance() { return certificate != null && privateKey != null; }
private boolean hasCaCertificateFile() { return caCertificatesFile != null; }
private boolean hasCaCertificateInstance() { return caCertificates != null; }
private Optional<KeyManager[]> createKeyManagers(KeyStore keystore) throws GeneralSecurityException {
if (!hasCertificateInstance() && !hasCertificateFile()) return Optional.empty();
KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
kmf.init(keystore, new char[0]);
return Optional.of(kmf.getKeyManagers());
}
private Optional<TrustManager[]> createTrustManagers(KeyStore keystore) throws GeneralSecurityException {
if (!hasCaCertificateInstance() && !hasCaCertificateFile()) return Optional.empty();
TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(keystore);
return Optional.of(tmf.getTrustManagers());
}
private static void addCaCertificates(KeyStore keystore, Collection<? extends Certificate> certificates) throws KeyStoreException {
int i = 0;
for (Certificate cert : certificates) {
keystore.setCertificateEntry("ca-cert-" + ++i, cert);
}
}
private static Certificate[] certificates(Path file) throws IOException, GeneralSecurityException {
try (PEMParser parser = new PEMParser(Files.newBufferedReader(file))) {
List<X509Certificate> result = new ArrayList<>();
Object pemObject;
while ((pemObject = parser.readObject()) != null) {
result.add(toX509Certificate(pemObject));
}
if (result.isEmpty()) throw new IOException("File contains no PEM encoded certificates: " + file);
return result.toArray(new Certificate[0]);
}
}
private static PrivateKey privateKey(Path file) throws IOException, GeneralSecurityException {
try (PEMParser parser = new PEMParser(Files.newBufferedReader(file))) {
Object pemObject;
while ((pemObject = parser.readObject()) != null) {
if (pemObject instanceof PrivateKeyInfo) {
PrivateKeyInfo keyInfo = (PrivateKeyInfo) pemObject;
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyInfo.getEncoded());
return createKeyFactory(keyInfo).generatePrivate(keySpec);
} else if (pemObject instanceof PEMKeyPair) {
PEMKeyPair pemKeypair = (PEMKeyPair) pemObject;
PrivateKeyInfo keyInfo = pemKeypair.getPrivateKeyInfo();
return createKeyFactory(keyInfo).generatePrivate(new PKCS8EncodedKeySpec(keyInfo.getEncoded()));
}
}
throw new IOException("Could not find private key in PEM file");
}
}
private static X509Certificate toX509Certificate(Object pemObject) throws IOException, GeneralSecurityException {
if (pemObject instanceof X509Certificate) return (X509Certificate) pemObject;
if (pemObject instanceof X509CertificateHolder) {
return new JcaX509CertificateConverter()
.setProvider(bcProvider)
.getCertificate((X509CertificateHolder) pemObject);
}
throw new IOException("Invalid type of PEM object: " + pemObject);
}
private static KeyFactory createKeyFactory(PrivateKeyInfo info) throws IOException, GeneralSecurityException {
ASN1ObjectIdentifier algorithm = info.getPrivateKeyAlgorithm().getAlgorithm();
if (X9ObjectIdentifiers.id_ecPublicKey.equals(algorithm)) {
return KeyFactory.getInstance("EC", bcProvider);
} else if (PKCSObjectIdentifiers.rsaEncryption.equals(algorithm)) {
return KeyFactory.getInstance("RSA", bcProvider);
} else {
throw new IOException("Unknown key algorithm: " + algorithm);
}
}
}
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