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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.net.smtp;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLHandshakeException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import org.apache.commons.net.io.CRLFLineReader;
import org.apache.commons.net.util.SSLContextUtils;
import org.apache.commons.net.util.SSLSocketUtils;
/**
* SMTP over SSL processing. Copied from FTPSClient.java and modified to suit SMTP.
* If implicit mode is selected (NOT the default), SSL/TLS negotiation starts right
* after the connection has been established. In explicit mode (the default), SSL/TLS
* negotiation starts when the user calls execTLS() and the server accepts the command.
* Implicit usage:
*
* SMTPSClient c = new SMTPSClient(true);
* c.connect("127.0.0.1", 465);
*
* Explicit usage:
*
* SMTPSClient c = new SMTPSClient();
* c.connect("127.0.0.1", 25);
* if (c.execTLS()) {
* // Rest of the commands here
* }
*
* Warning: the hostname is not verified against the certificate by default, use
* {@link #setHostnameVerifier(HostnameVerifier)} or {@link #setEndpointCheckingEnabled(boolean)}
* (on Java 1.7+) to enable verification.
* @since 3.0
*/
public class SMTPSClient extends SMTPClient
{
/** Default secure socket protocol name, like TLS */
private static final String DEFAULT_PROTOCOL = "TLS";
/** The security mode. True - Implicit Mode / False - Explicit Mode. */
private final boolean isImplicit;
/** The secure socket protocol to be used, like SSL/TLS. */
private final String protocol;
/** The context object. */
private SSLContext context;
/** The cipher suites. SSLSockets have a default set of these anyway,
so no initialization required. */
private String[] suites;
/** The protocol versions. */
private String[] protocols;
/** The {@link TrustManager} implementation, default null (i.e. use system managers). */
private TrustManager trustManager;
/** The {@link KeyManager}, default null (i.e. use system managers). */
private KeyManager keyManager; // seems not to be required
/** The {@link HostnameVerifier} to use post-TLS, default null (i.e. no verification). */
private HostnameVerifier hostnameVerifier;
/** Use Java 1.7+ HTTPS Endpoint Identification Algorithim. */
private boolean tlsEndpointChecking;
/**
* Constructor for SMTPSClient, using {@link #DEFAULT_PROTOCOL} i.e. TLS
* Sets security mode to explicit (isImplicit = false).
*/
public SMTPSClient()
{
this(DEFAULT_PROTOCOL, false);
}
/**
* Constructor for SMTPSClient, using {@link #DEFAULT_PROTOCOL} i.e. TLS
* @param implicit The security mode, {@code true} for implicit, {@code false} for explicit
*/
public SMTPSClient(final boolean implicit)
{
this(DEFAULT_PROTOCOL, implicit);
}
/**
* Constructor for SMTPSClient, using explicit security mode.
* @param proto the protocol.
*/
public SMTPSClient(final String proto)
{
this(proto, false);
}
/**
* Constructor for SMTPSClient.
* @param proto the protocol.
* @param implicit The security mode, {@code true} for implicit, {@code false} for explicit
*/
public SMTPSClient(final String proto, final boolean implicit)
{
protocol = proto;
isImplicit = implicit;
}
/**
* Constructor for SMTPSClient.
* @param proto the protocol.
* @param implicit The security mode, {@code true} for implicit, {@code false} for explicit
* @param encoding the encoding
* @since 3.3
*/
public SMTPSClient(final String proto, final boolean implicit, final String encoding)
{
super(encoding);
protocol = proto;
isImplicit = implicit;
}
/**
* Constructor for SMTPSClient, using {@link #DEFAULT_PROTOCOL} i.e. TLS
* @param implicit The security mode, {@code true} for implicit, {@code false} for explicit
* @param ctx A pre-configured SSL Context.
*/
public SMTPSClient(final boolean implicit, final SSLContext ctx)
{
isImplicit = implicit;
context = ctx;
protocol = DEFAULT_PROTOCOL;
}
/**
* Constructor for SMTPSClient.
* @param context A pre-configured SSL Context.
* @see #SMTPSClient(boolean, SSLContext)
*/
public SMTPSClient(final SSLContext context)
{
this(false, context);
}
/**
* Because there are so many connect() methods,
* the _connectAction_() method is provided as a means of performing
* some action immediately after establishing a connection,
* rather than reimplementing all of the connect() methods.
* @throws IOException If it is thrown by _connectAction_().
* @see org.apache.commons.net.SocketClient#_connectAction_()
*/
@Override
protected void _connectAction_() throws IOException
{
// Implicit mode.
if (isImplicit) {
applySocketAttributes();
performSSLNegotiation();
}
super._connectAction_();
// Explicit mode - don't do anything. The user calls execTLS()
}
/**
* Performs a lazy init of the SSL context.
* @throws IOException When could not initialize the SSL context.
*/
private void initSSLContext() throws IOException
{
if (context == null)
{
context = SSLContextUtils.createSSLContext(protocol, getKeyManager(), getTrustManager());
}
}
/**
* SSL/TLS negotiation. Acquires an SSL socket of a
* connection and carries out handshake processing.
* @throws IOException If server negotiation fails.
*/
private void performSSLNegotiation() throws IOException
{
initSSLContext();
final SSLSocketFactory ssf = context.getSocketFactory();
final String host = _hostname_ != null ? _hostname_ : getRemoteAddress().getHostAddress();
final int port = getRemotePort();
final SSLSocket socket =
(SSLSocket) ssf.createSocket(_socket_, host, port, true);
socket.setEnableSessionCreation(true);
socket.setUseClientMode(true);
if (tlsEndpointChecking) {
SSLSocketUtils.enableEndpointNameVerification(socket);
}
if (protocols != null) {
socket.setEnabledProtocols(protocols);
}
if (suites != null) {
socket.setEnabledCipherSuites(suites);
}
socket.startHandshake();
// TODO the following setup appears to duplicate that in the super class methods
_socket_ = socket;
_input_ = socket.getInputStream();
_output_ = socket.getOutputStream();
reader = new CRLFLineReader(
new InputStreamReader(_input_, encoding));
writer = new BufferedWriter(
new OutputStreamWriter(_output_, encoding));
if (hostnameVerifier != null && !hostnameVerifier.verify(host, socket.getSession())) {
throw new SSLHandshakeException("Hostname doesn't match certificate");
}
}
/**
* Get the {@link KeyManager} instance.
* @return The current {@link KeyManager} instance.
*/
public KeyManager getKeyManager()
{
return keyManager;
}
/**
* Set a {@link KeyManager} to use.
* @param newKeyManager The KeyManager implementation to set.
* @see org.apache.commons.net.util.KeyManagerUtils
*/
public void setKeyManager(final KeyManager newKeyManager)
{
keyManager = newKeyManager;
}
/**
* Controls which particular cipher suites are enabled for use on this
* connection. Called before server negotiation.
* @param cipherSuites The cipher suites.
*/
public void setEnabledCipherSuites(final String[] cipherSuites)
{
suites = cipherSuites.clone();
}
/**
* Returns the names of the cipher suites which could be enabled
* for use on this connection.
* When the underlying {@link java.net.Socket Socket} is not an {@link SSLSocket} instance, returns null.
* @return An array of cipher suite names, or null.
*/
public String[] getEnabledCipherSuites()
{
if (_socket_ instanceof SSLSocket)
{
return ((SSLSocket)_socket_).getEnabledCipherSuites();
}
return null;
}
/**
* Controls which particular protocol versions are enabled for use on this
* connection. I perform setting before a server negotiation.
* @param protocolVersions The protocol versions.
*/
public void setEnabledProtocols(final String[] protocolVersions)
{
protocols = protocolVersions.clone();
}
/**
* Returns the names of the protocol versions which are currently
* enabled for use on this connection.
* When the underlying {@link java.net.Socket Socket} is not an {@link SSLSocket} instance, returns null.
* @return An array of protocols, or null.
*/
public String[] getEnabledProtocols()
{
if (_socket_ instanceof SSLSocket)
{
return ((SSLSocket)_socket_).getEnabledProtocols();
}
return null;
}
/**
* The TLS command execution.
* @throws IOException If an I/O error occurs while sending
* the command or performing the negotiation.
* @return TRUE if the command and negotiation succeeded.
*/
public boolean execTLS() throws IOException
{
if (!SMTPReply.isPositiveCompletion(sendCommand("STARTTLS")))
{
return false;
//throw new SSLException(getReplyString());
}
performSSLNegotiation();
return true;
}
/**
* Get the currently configured {@link TrustManager}.
* @return A TrustManager instance.
*/
public TrustManager getTrustManager()
{
return trustManager;
}
/**
* Override the default {@link TrustManager} to use.
* @param newTrustManager The TrustManager implementation to set.
* @see org.apache.commons.net.util.TrustManagerUtils
*/
public void setTrustManager(final TrustManager newTrustManager)
{
trustManager = newTrustManager;
}
/**
* Get the currently configured {@link HostnameVerifier}.
* @return A HostnameVerifier instance.
* @since 3.4
*/
public HostnameVerifier getHostnameVerifier()
{
return hostnameVerifier;
}
/**
* Override the default {@link HostnameVerifier} to use.
* @param newHostnameVerifier The HostnameVerifier implementation to set or null to disable.
* @since 3.4
*/
public void setHostnameVerifier(final HostnameVerifier newHostnameVerifier)
{
hostnameVerifier = newHostnameVerifier;
}
/**
* Return whether or not endpoint identification using the HTTPS algorithm
* on Java 1.7+ is enabled. The default behavior is for this to be disabled.
*
* @return True if enabled, false if not.
* @since 3.4
*/
public boolean isEndpointCheckingEnabled()
{
return tlsEndpointChecking;
}
/**
* Automatic endpoint identification checking using the HTTPS algorithm
* is supported on Java 1.7+. The default behavior is for this to be disabled.
*
* @param enable Enable automatic endpoint identification checking using the HTTPS algorithm on Java 1.7+.
* @since 3.4
*/
public void setEndpointCheckingEnabled(final boolean enable)
{
tlsEndpointChecking = enable;
}
}
/* kate: indent-width 4; replace-tabs on; */
