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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.tls;
import com.yahoo.security.SslContextBuilder;
import com.yahoo.security.tls.authz.PeerAuthorizerTrustManagersFactory;
import com.yahoo.security.tls.policy.AuthorizedPeers;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import java.nio.file.Path;
import java.security.PrivateKey;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A static {@link TlsContext}
*
* @author bjorncs
*/
public class DefaultTlsContext implements TlsContext {
public static final List<String> ALLOWED_CIPHER_SUITES = Arrays.asList(
"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256",
"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
"TLS_AES_128_GCM_SHA256", // TLSv1.3
"TLS_AES_256_GCM_SHA384", // TLSv1.3
"TLS_CHACHA20_POLY1305_SHA256"); // TLSv1.3
public static final List<String> ALLOWED_PROTOCOLS = List.of("TLSv1.2"); // TODO Enable TLSv1.3
private static final Logger log = Logger.getLogger(DefaultTlsContext.class.getName());
private final SSLContext sslContext;
private final List<String> acceptedCiphers;
public DefaultTlsContext(List<X509Certificate> certificates,
PrivateKey privateKey,
List<X509Certificate> caCertificates,
AuthorizedPeers authorizedPeers,
AuthorizationMode mode,
List<String> acceptedCiphers) {
this.sslContext = createSslContext(certificates, privateKey, caCertificates, authorizedPeers, mode);
this.acceptedCiphers = acceptedCiphers;
}
public DefaultTlsContext(Path tlsOptionsConfigFile, AuthorizationMode mode) {
TransportSecurityOptions options = TransportSecurityOptions.fromJsonFile(tlsOptionsConfigFile);
this.sslContext = createSslContext(options, mode);
this.acceptedCiphers = options.getAcceptedCiphers();
}
@Override
public SSLEngine createSslEngine() {
SSLEngine sslEngine = sslContext.createSSLEngine();
restrictSetOfEnabledCiphers(sslEngine, acceptedCiphers);
restrictTlsProtocols(sslEngine);
return sslEngine;
}
private static void restrictSetOfEnabledCiphers(SSLEngine sslEngine, List<String> acceptedCiphers) {
String[] validCipherSuites = Arrays.stream(sslEngine.getSupportedCipherSuites())
.filter(suite -> ALLOWED_CIPHER_SUITES.contains(suite) && (acceptedCiphers.isEmpty() || acceptedCiphers.contains(suite)))
.toArray(String[]::new);
if (validCipherSuites.length == 0) {
throw new IllegalStateException(
String.format("None of the allowed cipher suites are supported " +
"(allowed-cipher-suites=%s, supported-cipher-suites=%s, accepted-cipher-suites=%s)",
ALLOWED_CIPHER_SUITES, List.of(sslEngine.getSupportedCipherSuites()), acceptedCiphers));
}
log.log(Level.FINE, () -> String.format("Allowed cipher suites that are supported: %s", Arrays.toString(validCipherSuites)));
sslEngine.setEnabledCipherSuites(validCipherSuites);
}
private static void restrictTlsProtocols(SSLEngine sslEngine) {
String[] validProtocols = Arrays.stream(sslEngine.getSupportedProtocols())
.filter(ALLOWED_PROTOCOLS::contains)
.toArray(String[]::new);
if (validProtocols.length == 0) {
throw new IllegalArgumentException(
String.format("None of the allowed protocols are supported (allowed-protocols=%s, supported-protocols=%s)",
ALLOWED_PROTOCOLS, Arrays.toString(sslEngine.getSupportedProtocols())));
}
log.log(Level.FINE, () -> String.format("Allowed protocols that are supported: %s", Arrays.toString(validProtocols)));
sslEngine.setEnabledProtocols(validProtocols);
}
private static SSLContext createSslContext(List<X509Certificate> certificates,
PrivateKey privateKey,
List<X509Certificate> caCertificates,
AuthorizedPeers authorizedPeers,
AuthorizationMode mode) {
SslContextBuilder builder = new SslContextBuilder();
if (!certificates.isEmpty()) {
builder.withKeyStore(privateKey, certificates);
}
if (!caCertificates.isEmpty()) {
builder.withTrustStore(caCertificates);
}
if (authorizedPeers != null) {
builder.withTrustManagerFactory(new PeerAuthorizerTrustManagersFactory(authorizedPeers, mode));
}
return builder.build();
}
private static SSLContext createSslContext(TransportSecurityOptions options, AuthorizationMode mode) {
SslContextBuilder builder = new SslContextBuilder();
options.getCertificatesFile()
.ifPresent(certificates -> builder.withKeyStore(options.getPrivateKeyFile().get(), certificates));
options.getCaCertificatesFile().ifPresent(builder::withTrustStore);
if (mode != AuthorizationMode.DISABLE) {
options.getAuthorizedPeers().ifPresent(
authorizedPeers -> builder.withTrustManagerFactory(new PeerAuthorizerTrustManagersFactory(authorizedPeers, mode)));
}
return builder.build();
}
}
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