1 files changed, 185 insertions, 0 deletions
diff --git a/security-utils/src/main/java/com/yahoo/security/tls/ConfigFileBasedTlsContext.java b/security-utils/src/main/java/com/yahoo/security/tls/ConfigFileBasedTlsContext.java
new file mode 100644
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+++ b/security-utils/src/main/java/com/yahoo/security/tls/ConfigFileBasedTlsContext.java
@@ -0,0 +1,185 @@
+// 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.KeyStoreBuilder;
+import com.yahoo.security.KeyStoreType;
+import com.yahoo.security.KeyUtils;
+import com.yahoo.security.SslContextBuilder;
+import com.yahoo.security.X509CertificateUtils;
+import com.yahoo.security.tls.authz.PeerAuthorizerTrustManager;
+import com.yahoo.security.tls.policy.AuthorizedPeers;
+
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLEngine;
+import javax.net.ssl.SSLParameters;
+import javax.net.ssl.X509ExtendedTrustManager;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.lang.ref.WeakReference;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.KeyStore;
+import java.time.Duration;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * A {@link TlsContext} that uses the tls configuration specified in the transport security options file.
+ * The credentials are regularly reloaded to support short-lived certificates.
+ *
+ * @author bjorncs
+ */
+public class ConfigFileBasedTlsContext implements TlsContext {
+
+    private static final Duration UPDATE_PERIOD = Duration.ofHours(1);
+
+    private static final Logger log = Logger.getLogger(ConfigFileBasedTlsContext.class.getName());
+
+    private final TlsContext tlsContext;
+    private final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor(new ReloaderThreadFactory());
+
+    public ConfigFileBasedTlsContext(Path tlsOptionsConfigFile, AuthorizationMode mode) {
+        TransportSecurityOptions options = TransportSecurityOptions.fromJsonFile(tlsOptionsConfigFile);
+        MutableX509TrustManager trustManager = new MutableX509TrustManager();
+        MutableX509KeyManager keyManager = new MutableX509KeyManager();
+        reloadTrustManager(options, trustManager);
+        reloadKeyManager(options, keyManager);
+        this.tlsContext = createDefaultTlsContext(options, mode, trustManager, keyManager);
+        this.scheduler.scheduleAtFixedRate(new CryptoMaterialReloader(tlsOptionsConfigFile, scheduler, trustManager, keyManager),
+                                           UPDATE_PERIOD.getSeconds()/*initial delay*/,
+                                           UPDATE_PERIOD.getSeconds(),
+                                           TimeUnit.SECONDS);
+    }
+
+    private static void reloadTrustManager(TransportSecurityOptions options, MutableX509TrustManager trustManager) {
+        if (options.getCaCertificatesFile().isPresent()) {
+            trustManager.updateTruststore(loadTruststore(options.getCaCertificatesFile().get()));
+        } else {
+            trustManager.useDefaultTruststore();
+        }
+    }
+
+    private static void reloadKeyManager(TransportSecurityOptions options, MutableX509KeyManager keyManager) {
+        if (options.getPrivateKeyFile().isPresent() && options.getCertificatesFile().isPresent()) {
+            keyManager.updateKeystore(loadKeystore(options.getPrivateKeyFile().get(), options.getCertificatesFile().get()), new char[0]);
+        } else {
+            keyManager.useDefaultKeystore();
+        }
+    }
+
+    private static KeyStore loadTruststore(Path caCertificateFile) {
+        try {
+            return KeyStoreBuilder.withType(KeyStoreType.PKCS12)
+                    .withCertificateEntries("cert", X509CertificateUtils.certificateListFromPem(Files.readString(caCertificateFile)))
+                    .build();
+        } catch (IOException e) {
+            throw new UncheckedIOException(e);
+        }
+    }
+
+    private static KeyStore loadKeystore(Path privateKeyFile, Path certificatesFile) {
+        try {
+            return KeyStoreBuilder.withType(KeyStoreType.PKCS12)
+                    .withKeyEntry(
+                            "default",
+                            KeyUtils.fromPemEncodedPrivateKey(Files.readString(privateKeyFile)),
+                            X509CertificateUtils.certificateListFromPem(Files.readString(certificatesFile)))
+                    .build();
+        } catch (IOException e) {
+            throw new UncheckedIOException(e);
+        }
+    }
+
+    private static DefaultTlsContext createDefaultTlsContext(TransportSecurityOptions options,
+                                                             AuthorizationMode mode,
+                                                             MutableX509TrustManager mutableTrustManager,
+                                                             MutableX509KeyManager mutableKeyManager) {
+        SSLContext sslContext = new SslContextBuilder()
+                .withKeyManager(mutableKeyManager)
+                .withTrustManagerFactory(
+                        ignoredTruststore -> options.getAuthorizedPeers()
+                                .map(authorizedPeers -> (X509ExtendedTrustManager) new PeerAuthorizerTrustManager(authorizedPeers, mode, mutableTrustManager))
+                                .orElseGet(() -> new PeerAuthorizerTrustManager(new AuthorizedPeers(Set.of()), AuthorizationMode.DISABLE, mutableTrustManager)))
+                .build();
+        List<String> acceptedCiphers = options.getAcceptedCiphers();
+        Set<String> ciphers = acceptedCiphers.isEmpty() ? TlsContext.ALLOWED_CIPHER_SUITES : new HashSet<>(acceptedCiphers);
+        return new DefaultTlsContext(sslContext, ciphers, PeerAuthentication.NEED);
+    }
+
+    // Wrapped methods from TlsContext
+    @Override public SSLContext context() { return tlsContext.context(); }
+    @Override public SSLParameters parameters() { return tlsContext.parameters(); }
+    @Override public SSLEngine createSslEngine() { return tlsContext.createSslEngine(); }
+    @Override public SSLEngine createSslEngine(String peerHost, int peerPort) { return tlsContext.createSslEngine(peerHost, peerPort); }
+
+    @Override
+    public void close() {
+        try {
+            scheduler.shutdownNow();
+            if (!scheduler.awaitTermination(10, TimeUnit.SECONDS)) {
+                throw new RuntimeException("Unable to shutdown executor before timeout");
+            }
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    // Note: no reference to outer class (directly or indirectly) to ensure trust/key managers are eventually GCed once
+    // there are no more use of the outer class and the underlying SSLContext
+    private static class CryptoMaterialReloader implements Runnable {
+
+        final Path tlsOptionsConfigFile;
+        final ScheduledExecutorService scheduler;
+        final WeakReference<MutableX509TrustManager> trustManager;
+        final WeakReference<MutableX509KeyManager> keyManager;
+
+        CryptoMaterialReloader(Path tlsOptionsConfigFile,
+                               ScheduledExecutorService scheduler,
+                               MutableX509TrustManager trustManager,
+                               MutableX509KeyManager keyManager) {
+            this.tlsOptionsConfigFile = tlsOptionsConfigFile;
+            this.scheduler = scheduler;
+            this.trustManager = new WeakReference<>(trustManager);
+            this.keyManager = new WeakReference<>(keyManager);
+        }
+
+        @Override
+        public void run() {
+            try {
+                MutableX509TrustManager trustManager = this.trustManager.get();
+                MutableX509KeyManager keyManager = this.keyManager.get();
+                if (trustManager == null && keyManager == null) {
+                    scheduler.shutdown();
+                    return;
+                }
+                TransportSecurityOptions options = TransportSecurityOptions.fromJsonFile(tlsOptionsConfigFile);
+                if (trustManager != null) {
+                    reloadTrustManager(options, trustManager);
+                }
+                if (keyManager != null) {
+                    reloadKeyManager(options, keyManager);
+                }
+            } catch (Throwable t) {
+                log.log(Level.SEVERE, String.format("Failed to reload crypto material (path='%s'): %s", tlsOptionsConfigFile, t.getMessage()), t);
+            }
+        }
+    }
+
+    // Static class to ensure no reference to outer class is contained
+    private static class ReloaderThreadFactory implements ThreadFactory {
+        @Override
+        public Thread newThread(Runnable r) {
+            Thread thread = new Thread(r, "tls-context-reloader");
+            thread.setDaemon(true);
+            return thread;
+        }
+    }
+
+}