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package panda.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 panda.net.io.CRLFLineReader;
import panda.net.ssl.SSLContexts;
import panda.net.ssl.SSLSockets;
/**
* 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.
*/
public class SMTPSClient extends SMTPClient {
/** Default secure socket protocol name, like TLS */
public static final String DEFAULT_PROTOCOL = SSLContexts.PROTO_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 = null;
/**
* The cipher suites. SSLSockets have a default set of these anyway, so no initialization
* required.
*/
private String[] suites = null;
/** The protocol versions. */
private String[] protocols = null;
/** The {@link TrustManager} implementation, default null (i.e. use system managers). */
private TrustManager trustManager = null;
/** The {@link KeyManager}, default null (i.e. use system managers). */
private KeyManager keyManager = null; // seems not to be required
/** The {@link HostnameVerifier} to use post-TLS, default null (i.e. no verification). */
private HostnameVerifier hostnameVerifier = null;
/** 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(boolean implicit) {
this(DEFAULT_PROTOCOL, implicit);
}
/**
* Constructor for SMTPSClient, using explicit security mode.
*
* @param proto the protocol.
*/
public SMTPSClient(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(String proto, 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
*/
public SMTPSClient(String proto, boolean implicit, 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(boolean implicit, 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(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 panda.net.SocketClient#_connectAction_()
*/
@Override
protected void _connectAction_() throws IOException {
// Implicit mode.
if (isImplicit) {
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 = SSLContexts.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();
SSLSocketFactory ssf = context.getSocketFactory();
String host = (_hostname_ != null) ? _hostname_ : getRemoteAddress().getHostAddress();
int port = getRemotePort();
SSLSocket socket = (SSLSocket)ssf.createSocket(_socket_, host, port, true);
socket.setEnableSessionCreation(true);
socket.setUseClientMode(true);
if (tlsEndpointChecking) {
SSLSockets.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 panda.net.ssl.KeyManagers
*/
public void setKeyManager(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(String[] cipherSuites) {
suites = new String[cipherSuites.length];
System.arraycopy(cipherSuites, 0, suites, 0, cipherSuites.length);
}
/**
* 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(String[] protocolVersions) {
protocols = new String[protocolVersions.length];
System.arraycopy(protocolVersions, 0, protocols, 0, protocolVersions.length);
}
/**
* 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 panda.net.ssl.TrustManagers
*/
public void setTrustManager(TrustManager newTrustManager) {
trustManager = newTrustManager;
}
/**
* Get the currently configured {@link HostnameVerifier}.
*
* @return A HostnameVerifier instance.
*/
public HostnameVerifier getHostnameVerifier() {
return hostnameVerifier;
}
/**
* Override the default {@link HostnameVerifier} to use.
*
* @param newHostnameVerifier The HostnameVerifier implementation to set or null to
* disable.
*/
public void setHostnameVerifier(HostnameVerifier newHostnameVerifier) {
hostnameVerifier = newHostnameVerifier;
}
/**
* Return whether or not endpoint identification using the HTTPS algorithm on Java 1.7+ is
* enabled. The default behaviour is for this to be disabled.
*
* @return True if enabled, false if not.
*/
public boolean isEndpointCheckingEnabled() {
return tlsEndpointChecking;
}
/**
* Automatic endpoint identification checking using the HTTPS algorithm is supported on Java
* 1.7+. The default behaviour is for this to be disabled.
*
* @param enable Enable automatic endpoint identification checking using the HTTPS algorithm on
* Java 1.7+.
*/
public void setEndpointCheckingEnabled(boolean enable) {
tlsEndpointChecking = enable;
}
}
/* kate: indent-width 4; replace-tabs on; */
