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// Copyright (C) 2009 The Android Open Source Project
//
// 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 org.apache.commons.net.smtp;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.gerrit.util.ssl.BlindSSLSocketFactory;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.SocketException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.List;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.net.ssl.SSLParameters;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import org.apache.commons.codec.binary.Base64;
public class AuthSMTPClient extends SMTPClient {
private String authTypes;
public AuthSMTPClient(String charset) {
super(charset);
}
public void enableSSL(boolean verify) {
_socketFactory_ = sslFactory(verify);
}
public boolean startTLS(String hostname, int port, boolean verify)
throws SocketException, IOException {
if (sendCommand("STARTTLS") != 220) {
return false;
}
_socket_ = sslFactory(verify).createSocket(_socket_, hostname, port, true);
if (verify) {
SSLParameters sslParams = new SSLParameters();
sslParams.setEndpointIdentificationAlgorithm("HTTPS");
((SSLSocket) _socket_).setSSLParameters(sslParams);
}
// XXX: Can't call _connectAction_() because SMTP server doesn't
// give banner information again after STARTTLS, thus SMTP._connectAction_()
// will wait on __getReply() forever, see source code of commons-net-2.2.
//
// The lines below are copied from SocketClient._connectAction_() and
// SMTP._connectAction_() in commons-net-2.2.
_socket_.setSoTimeout(_timeout_);
_input_ = _socket_.getInputStream();
_output_ = _socket_.getOutputStream();
_reader = new BufferedReader(new InputStreamReader(_input_, UTF_8));
_writer = new BufferedWriter(new OutputStreamWriter(_output_, UTF_8));
return true;
}
private static SSLSocketFactory sslFactory(boolean verify) {
if (verify) {
return (SSLSocketFactory) SSLSocketFactory.getDefault();
}
return (SSLSocketFactory) BlindSSLSocketFactory.getDefault();
}
@Override
public boolean login() throws IOException {
final String name = getLocalAddress().getHostName();
if (name == null) {
return false;
}
boolean ok = SMTPReply.isPositiveCompletion(sendCommand("EHLO", name));
authTypes = "";
for (String line : getReplyStrings()) {
if (line != null && (line.startsWith("250 AUTH ") || line.startsWith("250-AUTH "))) {
authTypes = line;
break;
}
}
return ok;
}
public boolean auth(String smtpUser, String smtpPass) throws IOException {
List<String> types = Arrays.asList(authTypes.split(" "));
if ("".equals(authTypes)) {
// Server didn't advertise authentication support.
//
return true;
}
if (smtpPass == null) {
smtpPass = "";
}
if (types.contains("CRAM-SHA1")) {
return authCram(smtpUser, smtpPass, "SHA1");
}
if (types.contains("CRAM-MD5")) {
return authCram(smtpUser, smtpPass, "MD5");
}
if (types.contains("LOGIN")) {
return authLogin(smtpUser, smtpPass);
}
if (types.contains("PLAIN")) {
return authPlain(smtpUser, smtpPass);
}
throw new IOException("Unsupported AUTH: " + authTypes);
}
private boolean authCram(String smtpUser, String smtpPass, String alg)
throws UnsupportedEncodingException, IOException {
final String macName = "Hmac" + alg;
if (sendCommand("AUTH", "CRAM-" + alg) != 334) {
return false;
}
final String enc = getReplyStrings()[0].split(" ", 2)[1];
final byte[] nonce = Base64.decodeBase64(enc.getBytes(UTF_8));
final String sec;
try {
Mac mac = Mac.getInstance(macName);
mac.init(new SecretKeySpec(smtpPass.getBytes(UTF_8), macName));
sec = toHex(mac.doFinal(nonce));
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
throw new IOException("Cannot use CRAM-" + alg, e);
}
String token = smtpUser + ' ' + sec;
String cmd = encodeBase64(token.getBytes(UTF_8));
return SMTPReply.isPositiveCompletion(sendCommand(cmd));
}
private boolean authLogin(String smtpUser, String smtpPass)
throws UnsupportedEncodingException, IOException {
if (sendCommand("AUTH", "LOGIN") != 334) {
return false;
}
String cmd = encodeBase64(smtpUser.getBytes(UTF_8));
if (sendCommand(cmd) != 334) {
return false;
}
cmd = encodeBase64(smtpPass.getBytes(UTF_8));
return SMTPReply.isPositiveCompletion(sendCommand(cmd));
}
private static final char[] hexchar = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
private String toHex(byte[] b) {
final StringBuilder sec = new StringBuilder();
for (byte c : b) {
final int u = (c >> 4) & 0xf;
final int l = c & 0xf;
sec.append(hexchar[u]);
sec.append(hexchar[l]);
}
return sec.toString();
}
private boolean authPlain(String smtpUser, String smtpPass)
throws UnsupportedEncodingException, IOException {
String token = '\0' + smtpUser + '\0' + smtpPass;
String cmd = "PLAIN " + encodeBase64(token.getBytes(UTF_8));
return SMTPReply.isPositiveCompletion(sendCommand("AUTH", cmd));
}
private static String encodeBase64(byte[] data) {
return new String(Base64.encodeBase64(data), UTF_8);
}
}
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