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/* Copyright 2013 predic8 GmbH, www.predic8.com
Licensed 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 com.predic8.membrane.core.transport.ssl;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;
import javax.annotation.Nullable;
import javax.net.ssl.SNIServerName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.oracle.util.ssl.SSLCapabilities;
import com.oracle.util.ssl.SSLExplorer;
import com.predic8.membrane.core.config.ConfigurationException;
import com.predic8.membrane.core.rules.ServiceProxyKey;
/**
* Manages multiple {@link SSLContext}s using the same port. This is only possible when using SSL with
* "Server Name Indication", see http://en.wikipedia.org/wiki/Server_Name_Indication .
*
* This requires Java 8.
*/
public class SSLContextCollection implements SSLProvider {
private static final Logger log = LoggerFactory.getLogger(SSLContextCollection.class.getName());
public static class Builder {
private List dnsNames = new ArrayList();
private List sslContexts = new ArrayList();
public SSLProvider build() throws ConfigurationException {
if (sslContexts.isEmpty())
throw new IllegalStateException("No SSLContext's were added to this Builder before invoking build().");
if (sslContexts.size() > 1) {
return new SSLContextCollection(sslContexts, dnsNames);
} else
return sslContexts.get(0);
}
public void add(SSLContext sslContext) {
if (!sslContexts.contains(sslContext)) {
sslContexts.add(sslContext);
dnsNames.add(sslContext.constructHostNamePattern());
}
}
}
private final List sslContexts;
private final List dnsNames;
/**
* @param sslContexts
* list of SSLContext
* @param dnsNames
* corresponding (=same length, 1:1 mapping) list of dnsName
* strings (same syntax as
* {@link ServiceProxyKey#setHost(String)})
*/
private SSLContextCollection(List sslContexts, List dnsNames) {
this.dnsNames = new ArrayList();
for (String dnsName : dnsNames)
this.dnsNames.add(Pattern.compile(ServiceProxyKey.createHostPattern(dnsName), Pattern.CASE_INSENSITIVE));
this.sslContexts = sslContexts;
}
public ServerSocket createServerSocket(int port, int backlog, InetAddress bindAddress) throws IOException {
return new ServerSocket(port, 50, bindAddress);
}
@Override
public Socket wrapAcceptedSocket(Socket socket) throws IOException {
InputStream ins = socket.getInputStream();
byte[] buffer = new byte[0xFF];
int position = 0;
SSLCapabilities capabilities = null;
//Set socket read timeout to 30 seconds
socket.setSoTimeout(30000);
// Read the header of TLS record
while (position < SSLExplorer.RECORD_HEADER_SIZE) {
int count = SSLExplorer.RECORD_HEADER_SIZE - position;
int n = ins.read(buffer, position, count);
if (n < 0) {
throw new IOException("unexpected end of stream!");
}
position += n;
}
// Get the required size to explore the SSL capabilities
int recordLength = SSLExplorer.getRequiredSize(buffer, 0, position);
if (buffer.length < recordLength) {
buffer = Arrays.copyOf(buffer, recordLength);
}
while (position < recordLength) {
int count = recordLength - position;
int n = ins.read(buffer, position, count);
if (n < 0) {
throw new IOException("unexpected end of stream!");
}
position += n;
}
capabilities = SSLExplorer.explore(buffer, 0, recordLength);
SSLContext sslContext = null;
if (capabilities != null) {
List serverNames = capabilities.getServerNames();
if (serverNames != null && serverNames.size() > 0) {
OUTER:
for (SNIServerName snisn : serverNames) {
String hostname = new String(snisn.getEncoded(), "UTF-8");
for (int i = 0; i < dnsNames.size(); i++)
if (dnsNames.get(i).matcher(hostname).matches()) {
sslContext = sslContexts.get(i);
break OUTER;
}
}
if (sslContext == null) {
// no hostname matched: send 'unrecognized_name' alert and close socket
byte[] alert_unrecognized_name = { 21 /* alert */, 3, 1 /* TLS 1.0 */, 0, 2 /* length: 2 bytes */,
2 /* fatal */, 112 /* unrecognized_name */ };
try {
socket.getOutputStream().write(alert_unrecognized_name);
} finally {
socket.close();
}
StringBuilder hostname = null;
for (SNIServerName snisn : serverNames) {
if (hostname == null)
hostname = new StringBuilder();
else
hostname.append(", ");
hostname.append(new String(snisn.getEncoded(), "UTF-8"));
}
throw new RuntimeException("no certificate configured (sending unrecognized_name alert) for hostname \"" + hostname + "\"");
}
}
}
// no Server Name Indication used by the client: fall back to first sslContext marked as 'useAsDefault'
// (or the first, if none is marked)
if (sslContext == null) {
for (SSLContext sc : sslContexts)
if (sc.isUseAsDefault()) {
sslContext = sc;
break;
}
}
if (sslContext == null)
sslContext = sslContexts.get(0);
return sslContext.wrap(socket, buffer, position);
}
private SSLContext getSSLContextForHostname(String hostname) {
SSLContext sslContext = null;
for (int i = 0; i < dnsNames.size(); i++)
if (dnsNames.get(i).matcher(hostname).matches()) {
sslContext = sslContexts.get(i);
break;
}
if (sslContext == null)
sslContext = sslContexts.get(0);
return sslContext;
}
@Override
public Socket createSocket() throws IOException {
throw new IllegalStateException("not implemented");
}
@Override
public Socket createSocket(String host, int port, InetAddress addr,
int localPort, int connectTimeout, @Nullable String sniServerName) throws IOException {
return getSSLContextForHostname(host).createSocket(host, port, addr, localPort, connectTimeout,sniServerName);
}
@Override
public boolean showSSLExceptions() {
for(SSLContext ctx : sslContexts)
if(ctx.showSSLExceptions() == false)
return false;
return true;
}
@Override
public Socket createSocket(String host, int port, int connectTimeout, @Nullable String sniServerName)
throws IOException {
return getSSLContextForHostname(host).createSocket(host, port, connectTimeout, sniServerName);
}
@Override
public Socket createSocket(Socket s, String host, int port, int connectTimeout, @Nullable String sniServerName)
throws IOException {
return getSSLContextForHostname(host).createSocket(s, host, port, connectTimeout, sniServerName);
}
}
