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k-9/src/com/fsck/k9/mail/transport/SmtpTransport.java

371 lines
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Java
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package com.android.email.mail.transport;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.GeneralSecurityException;
import java.security.SecureRandom;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.SSLException;
import android.util.Config;
import android.util.Log;
import com.android.email.Email;
import com.android.email.PeekableInputStream;
import com.android.email.codec.binary.Base64;
import com.android.email.mail.Address;
import com.android.email.mail.AuthenticationFailedException;
import com.android.email.mail.Message;
import com.android.email.mail.MessagingException;
import com.android.email.mail.Transport;
import com.android.email.mail.CertificateValidationException;
import com.android.email.mail.Message.RecipientType;
import com.android.email.mail.store.TrustManagerFactory;
public class SmtpTransport extends Transport {
public static final int CONNECTION_SECURITY_NONE = 0;
public static final int CONNECTION_SECURITY_TLS_OPTIONAL = 1;
public static final int CONNECTION_SECURITY_TLS_REQUIRED = 2;
public static final int CONNECTION_SECURITY_SSL_REQUIRED = 3;
public static final int CONNECTION_SECURITY_SSL_OPTIONAL = 4;
String mHost;
int mPort;
String mUsername;
String mPassword;
int mConnectionSecurity;
boolean mSecure;
Socket mSocket;
PeekableInputStream mIn;
OutputStream mOut;
/**
* smtp://user:password@server:port CONNECTION_SECURITY_NONE
* smtp+tls://user:password@server:port CONNECTION_SECURITY_TLS_OPTIONAL
* smtp+tls+://user:password@server:port CONNECTION_SECURITY_TLS_REQUIRED
* smtp+ssl+://user:password@server:port CONNECTION_SECURITY_SSL_REQUIRED
* smtp+ssl://user:password@server:port CONNECTION_SECURITY_SSL_OPTIONAL
*
* @param _uri
*/
public SmtpTransport(String _uri) throws MessagingException {
URI uri;
try {
uri = new URI(_uri);
} catch (URISyntaxException use) {
throw new MessagingException("Invalid SmtpTransport URI", use);
}
String scheme = uri.getScheme();
if (scheme.equals("smtp")) {
mConnectionSecurity = CONNECTION_SECURITY_NONE;
mPort = 25;
} else if (scheme.equals("smtp+tls")) {
mConnectionSecurity = CONNECTION_SECURITY_TLS_OPTIONAL;
mPort = 25;
} else if (scheme.equals("smtp+tls+")) {
mConnectionSecurity = CONNECTION_SECURITY_TLS_REQUIRED;
mPort = 25;
} else if (scheme.equals("smtp+ssl+")) {
mConnectionSecurity = CONNECTION_SECURITY_SSL_REQUIRED;
mPort = 465;
} else if (scheme.equals("smtp+ssl")) {
mConnectionSecurity = CONNECTION_SECURITY_SSL_OPTIONAL;
mPort = 465;
} else {
throw new MessagingException("Unsupported protocol");
}
mHost = uri.getHost();
if (uri.getPort() != -1) {
mPort = uri.getPort();
}
if (uri.getUserInfo() != null) {
String[] userInfoParts = uri.getUserInfo().split(":", 2);
mUsername = userInfoParts[0];
if (userInfoParts.length > 1) {
mPassword = userInfoParts[1];
}
}
}
public void open() throws MessagingException {
try {
SocketAddress socketAddress = new InetSocketAddress(mHost, mPort);
if (mConnectionSecurity == CONNECTION_SECURITY_SSL_REQUIRED ||
mConnectionSecurity == CONNECTION_SECURITY_SSL_OPTIONAL) {
SSLContext sslContext = SSLContext.getInstance("TLS");
boolean secure = mConnectionSecurity == CONNECTION_SECURITY_SSL_REQUIRED;
sslContext.init(null, new TrustManager[] {
TrustManagerFactory.get(mHost, secure)
}, new SecureRandom());
mSocket = sslContext.getSocketFactory().createSocket();
mSocket.connect(socketAddress, SOCKET_CONNECT_TIMEOUT);
mSecure = true;
} else {
mSocket = new Socket();
mSocket.connect(socketAddress, SOCKET_CONNECT_TIMEOUT);
}
mIn = new PeekableInputStream(new BufferedInputStream(mSocket.getInputStream(), 1024));
mOut = mSocket.getOutputStream();
// Eat the banner
executeSimpleCommand(null);
String localHost = "localhost";
try {
InetAddress localAddress = InetAddress.getLocalHost();
localHost = localAddress.getHostName();
} catch (Exception e) {
if (Config.LOGD) {
if (Email.DEBUG) {
Log.d(Email.LOG_TAG, "Unable to look up localhost");
}
}
}
String result = executeSimpleCommand("EHLO " + localHost);
/*
* TODO may need to add code to fall back to HELO I switched it from
* using HELO on non STARTTLS connections because of AOL's mail
* server. It won't let you use AUTH without EHLO.
* We should really be paying more attention to the capabilities
* and only attempting auth if it's available, and warning the user
* if not.
*/
if (mConnectionSecurity == CONNECTION_SECURITY_TLS_OPTIONAL
|| mConnectionSecurity == CONNECTION_SECURITY_TLS_REQUIRED) {
if (result.contains("-STARTTLS")) {
executeSimpleCommand("STARTTLS");
SSLContext sslContext = SSLContext.getInstance("TLS");
boolean secure = mConnectionSecurity == CONNECTION_SECURITY_TLS_REQUIRED;
sslContext.init(null, new TrustManager[] {
TrustManagerFactory.get(mHost, secure)
}, new SecureRandom());
mSocket = sslContext.getSocketFactory().createSocket(mSocket, mHost, mPort,
true);
mIn = new PeekableInputStream(new BufferedInputStream(mSocket.getInputStream(),
1024));
mOut = mSocket.getOutputStream();
mSecure = true;
/*
* Now resend the EHLO. Required by RFC2487 Sec. 5.2, and more specifically,
* Exim.
*/
result = executeSimpleCommand("EHLO " + localHost);
} else if (mConnectionSecurity == CONNECTION_SECURITY_TLS_REQUIRED) {
throw new MessagingException("TLS not supported but required");
}
}
/*
* result contains the results of the EHLO in concatenated form
*/
boolean authLoginSupported = result.matches(".*AUTH.*LOGIN.*$");
boolean authPlainSupported = result.matches(".*AUTH.*PLAIN.*$");
if (mUsername != null && mUsername.length() > 0 && mPassword != null
&& mPassword.length() > 0) {
if (authPlainSupported) {
saslAuthPlain(mUsername, mPassword);
}
else if (authLoginSupported) {
saslAuthLogin(mUsername, mPassword);
}
else {
throw new MessagingException("No valid authentication mechanism found.");
}
}
} catch (SSLException e) {
throw new CertificateValidationException(e.getMessage(), e);
} catch (GeneralSecurityException gse) {
throw new MessagingException(
"Unable to open connection to SMTP server due to security error.", gse);
} catch (IOException ioe) {
throw new MessagingException("Unable to open connection to SMTP server.", ioe);
}
}
public void sendMessage(Message message) throws MessagingException {
close();
open();
Address[] from = message.getFrom();
try {
executeSimpleCommand("MAIL FROM: " + "<" + from[0].getAddress() + ">");
for (Address address : message.getRecipients(RecipientType.TO)) {
executeSimpleCommand("RCPT TO: " + "<" + address.getAddress() + ">");
}
for (Address address : message.getRecipients(RecipientType.CC)) {
executeSimpleCommand("RCPT TO: " + "<" + address.getAddress() + ">");
}
for (Address address : message.getRecipients(RecipientType.BCC)) {
executeSimpleCommand("RCPT TO: " + "<" + address.getAddress() + ">");
}
message.setRecipients(RecipientType.BCC, null);
executeSimpleCommand("DATA");
// TODO byte stuffing
message.writeTo(
new EOLConvertingOutputStream(
new BufferedOutputStream(mOut, 1024)));
executeSimpleCommand("\r\n.");
} catch (IOException ioe) {
throw new MessagingException("Unable to send message", ioe);
}
}
public void close() {
try {
mIn.close();
} catch (Exception e) {
}
try {
mOut.close();
} catch (Exception e) {
}
try {
mSocket.close();
} catch (Exception e) {
}
mIn = null;
mOut = null;
mSocket = null;
}
private String readLine() throws IOException {
StringBuffer sb = new StringBuffer();
int d;
while ((d = mIn.read()) != -1) {
if (((char)d) == '\r') {
continue;
} else if (((char)d) == '\n') {
break;
} else {
sb.append((char)d);
}
}
String ret = sb.toString();
if (Config.LOGD) {
if (Email.DEBUG) {
Log.d(Email.LOG_TAG, "<<< " + ret);
}
}
return ret;
}
private void writeLine(String s) throws IOException {
if (Config.LOGD) {
if (Email.DEBUG) {
Log.d(Email.LOG_TAG, ">>> " + s);
}
}
mOut.write(s.getBytes());
mOut.write('\r');
mOut.write('\n');
mOut.flush();
}
private String executeSimpleCommand(String command) throws IOException, MessagingException {
if (command != null) {
writeLine(command);
}
String line = readLine();
String result = line;
while (line.length() >= 4 && line.charAt(3) == '-') {
line = readLine();
result += line.substring(3);
}
char c = result.charAt(0);
if ((c == '4') || (c == '5')) {
throw new MessagingException(result);
}
return result;
}
// C: AUTH LOGIN
// S: 334 VXNlcm5hbWU6
// C: d2VsZG9u
// S: 334 UGFzc3dvcmQ6
// C: dzNsZDBu
// S: 235 2.0.0 OK Authenticated
//
// Lines 2-5 of the conversation contain base64-encoded information. The same conversation, with base64 strings decoded, reads:
//
//
// C: AUTH LOGIN
// S: 334 Username:
// C: weldon
// S: 334 Password:
// C: w3ld0n
// S: 235 2.0.0 OK Authenticated
private void saslAuthLogin(String username, String password) throws MessagingException,
AuthenticationFailedException, IOException {
try {
executeSimpleCommand("AUTH LOGIN");
executeSimpleCommand(new String(Base64.encodeBase64(username.getBytes())));
executeSimpleCommand(new String(Base64.encodeBase64(password.getBytes())));
}
catch (MessagingException me) {
if (me.getMessage().length() > 1 && me.getMessage().charAt(1) == '3') {
throw new AuthenticationFailedException("AUTH LOGIN failed (" + me.getMessage()
+ ")");
}
throw me;
}
}
private void saslAuthPlain(String username, String password) throws MessagingException,
AuthenticationFailedException, IOException {
byte[] data = ("\000" + username + "\000" + password).getBytes();
data = new Base64().encode(data);
try {
executeSimpleCommand("AUTH PLAIN " + new String(data));
}
catch (MessagingException me) {
if (me.getMessage().length() > 1 && me.getMessage().charAt(1) == '3') {
throw new AuthenticationFailedException("AUTH PLAIN failed (" + me.getMessage()
+ ")");
}
throw me;
}
}
}
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