264 lines
12 KiB
Java
264 lines
12 KiB
Java
/*
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* DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway
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* Copyright (C) 2009 Mickael Guessant
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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package davmail.smtp;
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import davmail.AbstractConnection;
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import davmail.BundleMessage;
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import davmail.DavGateway;
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import davmail.exception.DavMailException;
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import davmail.exchange.DoubleDotInputStream;
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import davmail.exchange.ExchangeSessionFactory;
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import davmail.ui.tray.DavGatewayTray;
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import davmail.util.IOUtil;
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import javax.mail.internet.AddressException;
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import javax.mail.internet.InternetAddress;
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import javax.mail.internet.MimeMessage;
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import javax.mail.util.SharedByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.net.Socket;
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import java.net.SocketException;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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import java.util.StringTokenizer;
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/**
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* Dav Gateway smtp connection implementation
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*/
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public class SmtpConnection extends AbstractConnection {
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/**
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* Initialize the streams and start the thread.
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*
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* @param clientSocket SMTP client socket
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*/
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public SmtpConnection(Socket clientSocket) {
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super(SmtpConnection.class.getSimpleName(), clientSocket, null);
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}
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@Override
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public void run() {
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String line;
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StringTokenizer tokens;
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List<String> recipients = new ArrayList<String>();
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try {
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ExchangeSessionFactory.checkConfig();
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sendClient("220 DavMail " + DavGateway.getCurrentVersion() + " SMTP ready at " + new Date());
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for (; ;) {
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line = readClient();
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// unable to read line, connection closed ?
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if (line == null) {
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break;
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}
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tokens = new StringTokenizer(line);
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if (tokens.hasMoreTokens()) {
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String command = tokens.nextToken();
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if (state == State.LOGIN) {
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// AUTH LOGIN, read userName
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userName = IOUtil.decodeBase64AsString(line);
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sendClient("334 " + IOUtil.encodeBase64AsString("Password:"));
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state = State.PASSWORD;
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} else if (state == State.PASSWORD) {
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// AUTH LOGIN, read password
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password = IOUtil.decodeBase64AsString(line);
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authenticate();
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} else if ("QUIT".equalsIgnoreCase(command)) {
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sendClient("221 Closing connection");
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break;
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} else if ("NOOP".equalsIgnoreCase(command)) {
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sendClient("250 OK");
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} else if ("EHLO".equalsIgnoreCase(command)) {
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sendClient("250-" + tokens.nextToken());
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// inform server that AUTH is supported
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// actually it is mandatory (only way to get credentials)
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sendClient("250-AUTH LOGIN PLAIN");
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sendClient("250-8BITMIME");
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sendClient("250 Hello");
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} else if ("HELO".equalsIgnoreCase(command)) {
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sendClient("250 Hello");
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} else if ("AUTH".equalsIgnoreCase(command)) {
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if (tokens.hasMoreElements()) {
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String authType = tokens.nextToken();
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if ("PLAIN".equalsIgnoreCase(authType) && tokens.hasMoreElements()) {
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decodeCredentials(tokens.nextToken());
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authenticate();
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} else if ("LOGIN".equalsIgnoreCase(authType)) {
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if (tokens.hasMoreTokens()) {
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// user name sent on auth line
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userName = IOUtil.decodeBase64AsString(tokens.nextToken());
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sendClient("334 " + IOUtil.encodeBase64AsString("Password:"));
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state = State.PASSWORD;
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} else {
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sendClient("334 " + IOUtil.encodeBase64AsString("Username:"));
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state = State.LOGIN;
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}
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} else {
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sendClient("451 Error : unknown authentication type");
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}
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} else {
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sendClient("451 Error : authentication type not specified");
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}
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} else if ("MAIL".equalsIgnoreCase(command)) {
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if (state == State.AUTHENTICATED) {
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state = State.STARTMAIL;
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recipients.clear();
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sendClient("250 Sender OK");
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} else if (state == State.INITIAL) {
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sendClient("503 Authentication required");
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} else {
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state = State.INITIAL;
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sendClient("503 Bad sequence of commands");
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}
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} else if ("RCPT".equalsIgnoreCase(command)) {
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if (state == State.STARTMAIL || state == State.RECIPIENT) {
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if (line.toUpperCase().startsWith("RCPT TO:")) {
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state = State.RECIPIENT;
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try {
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InternetAddress internetAddress = new InternetAddress(line.substring("RCPT TO:".length()));
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recipients.add(internetAddress.getAddress());
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} catch (AddressException e) {
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throw new DavMailException("EXCEPTION_INVALID_RECIPIENT", line);
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}
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sendClient("250 Recipient OK");
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} else {
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sendClient("500 Unrecognized command");
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}
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} else {
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state = State.AUTHENTICATED;
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sendClient("503 Bad sequence of commands");
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}
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} else if ("DATA".equalsIgnoreCase(command)) {
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if (state == State.RECIPIENT) {
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state = State.MAILDATA;
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sendClient("354 Start mail input; end with <CRLF>.<CRLF>");
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try {
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// read message in buffer
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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DoubleDotInputStream doubleDotInputStream = new DoubleDotInputStream(in);
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int b;
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while ((b = doubleDotInputStream.read()) >= 0) {
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baos.write(b);
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}
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MimeMessage mimeMessage = new MimeMessage(null, new SharedByteArrayInputStream(baos.toByteArray()));
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session.sendMessage(recipients, mimeMessage);
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state = State.AUTHENTICATED;
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sendClient("250 Queued mail for delivery");
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} catch (Exception e) {
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DavGatewayTray.error(e);
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state = State.AUTHENTICATED;
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sendClient("451 Error : " + e + ' ' + e.getMessage());
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}
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} else {
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state = State.AUTHENTICATED;
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sendClient("503 Bad sequence of commands");
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}
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} else if ("RSET".equalsIgnoreCase(command)) {
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recipients.clear();
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if (state == State.STARTMAIL ||
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state == State.RECIPIENT ||
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state == State.MAILDATA ||
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state == State.AUTHENTICATED) {
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state = State.AUTHENTICATED;
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} else {
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state = State.INITIAL;
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}
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sendClient("250 OK Reset");
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} else {
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sendClient("500 Unrecognized command");
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}
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} else {
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sendClient("500 Unrecognized command");
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}
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os.flush();
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}
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} catch (SocketException e) {
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DavGatewayTray.debug(new BundleMessage("LOG_CONNECTION_CLOSED"));
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} catch (Exception e) {
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DavGatewayTray.log(e);
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try {
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sendClient("500 " + ((e.getMessage() == null) ? e : e.getMessage()));
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} catch (IOException e2) {
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DavGatewayTray.debug(new BundleMessage("LOG_EXCEPTION_SENDING_ERROR_TO_CLIENT"), e2);
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}
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} finally {
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close();
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}
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DavGatewayTray.resetIcon();
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}
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/**
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* Create authenticated session with Exchange server
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*
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* @throws IOException on error
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*/
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protected void authenticate() throws IOException {
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try {
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session = ExchangeSessionFactory.getInstance(userName, password);
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sendClient("235 OK Authenticated");
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state = State.AUTHENTICATED;
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} catch (Exception e) {
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DavGatewayTray.error(e);
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String message = e.getMessage();
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if (message == null) {
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message = e.toString();
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}
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message = message.replaceAll("\\n", " ");
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sendClient("554 Authenticated failed " + message);
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state = State.INITIAL;
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}
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}
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/**
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* Decode SMTP credentials
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*
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* @param encodedCredentials smtp encoded credentials
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* @throws IOException if invalid credentials
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*/
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protected void decodeCredentials(String encodedCredentials) throws IOException {
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String decodedCredentials = IOUtil.decodeBase64AsString(encodedCredentials);
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int startIndex = decodedCredentials.indexOf((char) 0);
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if (startIndex >=0) {
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int endIndex = decodedCredentials.indexOf((char) 0, startIndex+1);
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if (endIndex >=0) {
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userName = decodedCredentials.substring(startIndex+1, endIndex);
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password = decodedCredentials.substring(endIndex + 1);
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} else {
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throw new DavMailException("EXCEPTION_INVALID_CREDENTIALS");
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}
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} else {
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throw new DavMailException("EXCEPTION_INVALID_CREDENTIALS");
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}
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}
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}
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