1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.net.ftp;
19
20 import java.io.BufferedReader;
21 import java.io.BufferedWriter;
22 import java.io.IOException;
23 import java.io.InputStreamReader;
24 import java.io.OutputStreamWriter;
25 import java.net.Inet6Address;
26 import java.net.InetAddress;
27 import java.net.InetSocketAddress;
28 import java.net.ServerSocket;
29 import java.net.Socket;
30 import java.util.Base64;
31
32 import javax.net.ssl.HostnameVerifier;
33 import javax.net.ssl.KeyManager;
34 import javax.net.ssl.SSLContext;
35 import javax.net.ssl.SSLException;
36 import javax.net.ssl.SSLHandshakeException;
37 import javax.net.ssl.SSLSocket;
38 import javax.net.ssl.SSLSocketFactory;
39 import javax.net.ssl.TrustManager;
40
41 import org.apache.commons.net.util.SSLContextUtils;
42 import org.apache.commons.net.util.SSLSocketUtils;
43 import org.apache.commons.net.util.TrustManagerUtils;
44
45 /**
46 * FTP over SSL processing. If desired, the JVM property -Djavax.net.debug=all can be used to see wire-level SSL details.
47 *
48 * Warning: the hostname is not verified against the certificate by default, use {@link #setHostnameVerifier(HostnameVerifier)} or
49 * {@link #setEndpointCheckingEnabled(boolean)} (on Java 1.7+) to enable verification. Verification is only performed on client mode connections.
50 *
51 * @since 2.0
52 */
53 public class FTPSClient extends FTPClient {
54
55 // From http://www.iana.org/assignments/port-numbers
56
57 // ftps-data 989/tcp ftp protocol, data, over TLS/SSL
58 // ftps-data 989/udp ftp protocol, data, over TLS/SSL
59 // ftps 990/tcp ftp protocol, control, over TLS/SSL
60 // ftps 990/udp ftp protocol, control, over TLS/SSL
61
62 /** Default FTPS data port. */
63 public static final int DEFAULT_FTPS_DATA_PORT = 989;
64
65 /** Default FTPS port. */
66 public static final int DEFAULT_FTPS_PORT = 990;
67
68 /** The value that I can set in PROT command (C = Clear, P = Protected) */
69 private static final String[] PROT_COMMAND_VALUE = { "C", "E", "S", "P" };
70
71 /** Default PROT Command */
72 private static final String DEFAULT_PROT = "C";
73
74 /** Default secure socket protocol name, i.e. TLS */
75 private static final String DEFAULT_PROTOCOL = "TLS";
76
77 /** The AUTH (Authentication/Security Mechanism) command. */
78 private static final String CMD_AUTH = "AUTH";
79
80 /** The ADAT (Authentication/Security Data) command. */
81 private static final String CMD_ADAT = "ADAT";
82
83 /** The PROT (Data Channel Protection Level) command. */
84 private static final String CMD_PROT = "PROT";
85
86 /** The PBSZ (Protection Buffer Size) command. */
87 private static final String CMD_PBSZ = "PBSZ";
88
89 /** The MIC (Integrity Protected Command) command. */
90 private static final String CMD_MIC = "MIC";
91
92 /** The CONF (Confidentiality Protected Command) command. */
93 private static final String CMD_CONF = "CONF";
94
95 /** The ENC (Privacy Protected Command) command. */
96 private static final String CMD_ENC = "ENC";
97
98 /** The CCC (Clear Command Channel) command. */
99 private static final String CMD_CCC = "CCC";
100
101 /** @deprecated - not used - may be removed in a future release */
102 @Deprecated
103 public static String KEYSTORE_ALGORITHM;
104
105 /** @deprecated - not used - may be removed in a future release */
106 @Deprecated
107 public static String TRUSTSTORE_ALGORITHM;
108
109 /** @deprecated - not used - may be removed in a future release */
110 @Deprecated
111 public static String PROVIDER;
112
113 /** @deprecated - not used - may be removed in a future release */
114 @Deprecated
115 public static String STORE_TYPE;
116
117 /** The security mode. (True - Implicit Mode / False - Explicit Mode) */
118 private final boolean isImplicit;
119
120 /** The secure socket protocol to be used, e.g. SSL/TLS. */
121 private final String protocol;
122
123 /** The AUTH Command value */
124 private String auth = DEFAULT_PROTOCOL;
125
126 /** The context object. */
127 private SSLContext context;
128
129 /** The socket object. */
130 private Socket plainSocket;
131
132 /** Controls whether a new SSL session may be established by this socket. Default true. */
133 private boolean isCreation = true;
134
135 /** The use client mode flag. */
136 private boolean isClientMode = true;
137
138 /** The need client auth flag. */
139 private boolean isNeedClientAuth;
140
141 /** The want client auth flag. */
142 private boolean isWantClientAuth;
143
144 /** The cipher suites */
145 private String[] suites;
146
147 /** The protocol versions */
148 private String[] protocols;
149
150 /**
151 * The FTPS {@link TrustManager} implementation, default validate only {@link TrustManagerUtils#getValidateServerCertificateTrustManager()}.
152 */
153 private TrustManager trustManager = TrustManagerUtils.getValidateServerCertificateTrustManager();
154
155 /** The {@link KeyManager}, default null (i.e. use system default). */
156 private KeyManager keyManager;
157
158 /** The {@link HostnameVerifier} to use post-TLS, default null (i.e. no verification). */
159 private HostnameVerifier hostnameVerifier;
160
161 /** Use Java 1.7+ HTTPS Endpoint Identification Algorithm. */
162 private boolean tlsEndpointChecking;
163
164 /**
165 * Constructor for FTPSClient, calls {@link #FTPSClient(String, boolean)}.
166 *
167 * Sets protocol to {@link #DEFAULT_PROTOCOL} - i.e. TLS - and security mode to explicit (isImplicit = false)
168 */
169 public FTPSClient() {
170 this(DEFAULT_PROTOCOL, false);
171 }
172
173 /**
174 * Constructor for FTPSClient, using {@link #DEFAULT_PROTOCOL} - i.e. TLS Calls {@link #FTPSClient(String, boolean)}
175 *
176 * @param isImplicit The security mode (Implicit/Explicit).
177 */
178 public FTPSClient(final boolean isImplicit) {
179 this(DEFAULT_PROTOCOL, isImplicit);
180 }
181
182 /**
183 * Constructor for FTPSClient, using {@link #DEFAULT_PROTOCOL} - i.e. TLS The default TrustManager is set from
184 * {@link TrustManagerUtils#getValidateServerCertificateTrustManager()}
185 *
186 * @param isImplicit The security mode(Implicit/Explicit).
187 * @param context A pre-configured SSL Context
188 */
189 public FTPSClient(final boolean isImplicit, final SSLContext context) {
190 this(DEFAULT_PROTOCOL, isImplicit);
191 this.context = context;
192 }
193
194 /**
195 * Constructor for FTPSClient, using {@link #DEFAULT_PROTOCOL} - i.e. TLS and isImplicit {@code false} Calls {@link #FTPSClient(boolean, SSLContext)}
196 *
197 * @param context A pre-configured SSL Context
198 */
199 public FTPSClient(final SSLContext context) {
200 this(false, context);
201 }
202
203 /**
204 * Constructor for FTPSClient, using explicit mode, calls {@link #FTPSClient(String, boolean)}.
205 *
206 * @param protocol the protocol to use
207 */
208 public FTPSClient(final String protocol) {
209 this(protocol, false);
210 }
211
212 /**
213 * Constructor for FTPSClient allowing specification of protocol and security mode. If isImplicit is true, the port is set to {@link #DEFAULT_FTPS_PORT}
214 * i.e. 990. The default TrustManager is set from {@link TrustManagerUtils#getValidateServerCertificateTrustManager()}
215 *
216 * @param protocol the protocol
217 * @param isImplicit The security mode(Implicit/Explicit).
218 */
219 public FTPSClient(final String protocol, final boolean isImplicit) {
220 this.protocol = protocol;
221 this.isImplicit = isImplicit;
222 if (isImplicit) {
223 setDefaultPort(DEFAULT_FTPS_PORT);
224 }
225 }
226
227 /**
228 * Because there are so many connect() methods, the _connectAction_() method is provided as a means of performing some action immediately after establishing
229 * a connection, rather than reimplementing all the connect() methods.
230 *
231 * @throws IOException If there is any problem with establishing the connection.
232 * @see org.apache.commons.net.SocketClient#_connectAction_()
233 */
234 @Override
235 protected void _connectAction_() throws IOException {
236 // Implicit mode.
237 if (isImplicit) {
238 applySocketAttributes();
239 sslNegotiation();
240 }
241 super._connectAction_();
242 // Explicit mode.
243 if (!isImplicit) {
244 execAUTH();
245 sslNegotiation();
246 }
247 }
248
249 /**
250 * Returns a socket of the data connection. Wrapped as an {@link SSLSocket}, which carries out handshake processing.
251 *
252 * @param command The int representation of the FTP command to send.
253 * @param arg The arguments to the FTP command. If this parameter is set to null, then the command is sent with no arguments.
254 * @return corresponding to the established data connection. Null is returned if an FTP protocol error is reported at any point during the establishment and
255 * initialization of the connection.
256 * @throws IOException If there is any problem with the connection.
257 * @see FTPClient#_openDataConnection_(int, String)
258 * @deprecated (3.3) Use {@link FTPClient#_openDataConnection_(FTPCmd, String)} instead
259 */
260 @Override
261 // Strictly speaking this is not needed, but it works round a Clirr bug
262 // So rather than invoke the parent code, we do it here
263 @Deprecated
264 protected Socket _openDataConnection_(final int command, final String arg) throws IOException {
265 return _openDataConnection_(FTPCommand.getCommand(command), arg);
266 }
267
268 /**
269 * Returns a socket of the data connection. Wrapped as an {@link SSLSocket}, which carries out handshake processing.
270 *
271 * @param command The textual representation of the FTP command to send.
272 * @param arg The arguments to the FTP command. If this parameter is set to null, then the command is sent with no arguments.
273 * @return corresponding to the established data connection. Null is returned if an FTP protocol error is reported at any point during the establishment and
274 * initialization of the connection.
275 * @throws IOException If there is any problem with the connection.
276 * @see FTPClient#_openDataConnection_(int, String)
277 * @since 3.2
278 */
279 @Override
280 protected Socket _openDataConnection_(final String command, final String arg) throws IOException {
281 final Socket socket = openDataSecureConnection(command, arg);
282 _prepareDataSocket_(socket);
283 if (socket instanceof SSLSocket) {
284 final SSLSocket sslSocket = (SSLSocket) socket;
285
286 sslSocket.setUseClientMode(isClientMode);
287 sslSocket.setEnableSessionCreation(isCreation);
288
289 // server mode
290 if (!isClientMode) {
291 sslSocket.setNeedClientAuth(isNeedClientAuth);
292 sslSocket.setWantClientAuth(isWantClientAuth);
293 }
294 if (suites != null) {
295 sslSocket.setEnabledCipherSuites(suites);
296 }
297 if (protocols != null) {
298 sslSocket.setEnabledProtocols(protocols);
299 }
300 sslSocket.startHandshake();
301 }
302
303 return socket;
304 }
305
306 /**
307 * Performs any custom initialization for a newly created SSLSocket (before the SSL handshake happens). Called by {@link #_openDataConnection_(int, String)}
308 * immediately after creating the socket. The default implementation is a no-op
309 *
310 * @param socket the socket to set up
311 * @throws IOException on error
312 * @since 3.1
313 */
314 protected void _prepareDataSocket_(final Socket socket) throws IOException {
315 }
316
317 /**
318 * Check the value that can be set in PROT Command value.
319 *
320 * @param prot Data Channel Protection Level.
321 * @return True - A set point is right / False - A set point is not right
322 */
323 private boolean checkPROTValue(final String prot) {
324 for (final String element : PROT_COMMAND_VALUE) {
325 if (element.equals(prot)) {
326 return true;
327 }
328 }
329 return false;
330 }
331
332 /**
333 * Close open sockets.
334 *
335 * @param socket main socket for proxy if enabled
336 * @param sslSocket ssl socket
337 * @throws IOException closing sockets is not successful
338 */
339 private void closeSockets(final Socket socket, final Socket sslSocket) throws IOException {
340 if (socket != null) {
341 socket.close();
342 }
343 if (sslSocket != null) {
344 sslSocket.close();
345 }
346 }
347
348 /**
349 * Create SSL socket from plain socket.
350 *
351 * @param socket
352 * @return SSL Socket
353 * @throws IOException
354 */
355 private SSLSocket createSSLSocket(final Socket socket) throws IOException {
356 if (socket != null) {
357 final SSLSocketFactory f = context.getSocketFactory();
358 return (SSLSocket) f.createSocket(socket, _hostname_, socket.getPort(), false);
359 }
360 return null;
361 }
362
363 /**
364 * Closes the connection to the FTP server and restores connection parameters to the default values.
365 * <p>
366 * Calls {@code setSocketFactory(null)} and {@code setServerSocketFactory(null)} to reset the factories that may have been changed during the session, e.g.
367 * by {@link #execPROT(String)}
368 *
369 * @throws IOException If an error occurs while disconnecting.
370 * @since 3.0
371 */
372 @Override
373 public void disconnect() throws IOException {
374 super.disconnect();
375 if (plainSocket != null) {
376 plainSocket.close();
377 }
378 setSocketFactory(null);
379 setServerSocketFactory(null);
380 }
381
382 /**
383 * Send the ADAT command with the specified authentication data.
384 *
385 * @param data The data to send with the command.
386 * @return server reply.
387 * @throws IOException If an I/O error occurs while sending the command.
388 * @since 3.0
389 */
390 public int execADAT(final byte[] data) throws IOException {
391 if (data != null) {
392 return sendCommand(CMD_ADAT, Base64.getEncoder().encodeToString(data));
393 }
394 return sendCommand(CMD_ADAT);
395 }
396
397 /**
398 * AUTH command.
399 *
400 * @throws SSLException If the server reply code equals neither "234" nor "334".
401 * @throws IOException If an I/O error occurs while either sending the command.
402 */
403 protected void execAUTH() throws SSLException, IOException {
404 final int replyCode = sendCommand(CMD_AUTH, auth);
405 if (FTPReply.SECURITY_MECHANISM_IS_OK == replyCode) {
406 // replyCode = 334
407 // I carry out an ADAT command.
408 } else if (FTPReply.SECURITY_DATA_EXCHANGE_COMPLETE != replyCode) {
409 throw new SSLException(getReplyString());
410 }
411 }
412
413 /**
414 * Send the AUTH command with the specified mechanism.
415 *
416 * @param mechanism The mechanism name to send with the command.
417 * @return server reply.
418 * @throws IOException If an I/O error occurs while sending the command.
419 * @since 3.0
420 */
421 public int execAUTH(final String mechanism) throws IOException {
422 return sendCommand(CMD_AUTH, mechanism);
423 }
424
425 /**
426 * Send the CCC command to the server. The CCC (Clear Command Channel) command causes the underlying {@link SSLSocket} instance to be assigned to a plain
427 * {@link Socket} instances
428 *
429 * @return server reply.
430 * @throws IOException If an I/O error occurs while sending the command.
431 * @since 3.0
432 */
433 public int execCCC() throws IOException {
434 final int repCode = sendCommand(CMD_CCC);
435 // This will be performed by sendCommand(String, String)
436 // if (FTPReply.isPositiveCompletion(repCode)) {
437 // _socket_.close();
438 // _socket_ = plainSocket;
439 // _controlInput_ = new BufferedReader(
440 // new InputStreamReader(
441 // _socket_.getInputStream(), getControlEncoding()));
442 // _controlOutput_ = new BufferedWriter(
443 // new OutputStreamWriter(
444 // _socket_.getOutputStream(), getControlEncoding()));
445 // }
446 return repCode;
447 }
448
449 /**
450 * Send the CONF command with the specified data.
451 *
452 * @param data The data to send with the command.
453 * @return server reply.
454 * @throws IOException If an I/O error occurs while sending the command.
455 * @since 3.0
456 */
457 public int execCONF(final byte[] data) throws IOException {
458 if (data != null) {
459 return sendCommand(CMD_CONF, Base64.getEncoder().encodeToString(data));
460 }
461 return sendCommand(CMD_CONF, ""); // perhaps "=" or just sendCommand(String)?
462 }
463
464 /**
465 * Send the ENC command with the specified data.
466 *
467 * @param data The data to send with the command.
468 * @return server reply.
469 * @throws IOException If an I/O error occurs while sending the command.
470 * @since 3.0
471 */
472 public int execENC(final byte[] data) throws IOException {
473 if (data != null) {
474 return sendCommand(CMD_ENC, Base64.getEncoder().encodeToString(data));
475 }
476 return sendCommand(CMD_ENC, ""); // perhaps "=" or just sendCommand(String)?
477 }
478
479 /**
480 * Send the MIC command with the specified data.
481 *
482 * @param data The data to send with the command.
483 * @return server reply.
484 * @throws IOException If an I/O error occurs while sending the command.
485 * @since 3.0
486 */
487 public int execMIC(final byte[] data) throws IOException {
488 if (data != null) {
489 return sendCommand(CMD_MIC, Base64.getEncoder().encodeToString(data));
490 }
491 return sendCommand(CMD_MIC, ""); // perhaps "=" or just sendCommand(String)?
492 }
493
494 /**
495 * PBSZ command. pbsz value: 0 to (2^32)-1 decimal integer.
496 *
497 * @param pbsz Protection Buffer Size.
498 * @throws SSLException If the server reply code does not equal "200".
499 * @throws IOException If an I/O error occurs while sending the command.
500 * @see #parsePBSZ(long)
501 */
502 public void execPBSZ(final long pbsz) throws SSLException, IOException {
503 if (pbsz < 0 || 4294967295L < pbsz) { // 32-bit unsigned number
504 throw new IllegalArgumentException();
505 }
506 final int status = sendCommand(CMD_PBSZ, String.valueOf(pbsz));
507 if (FTPReply.COMMAND_OK != status) {
508 throw new SSLException(getReplyString());
509 }
510 }
511
512 /**
513 * PROT command.
514 * <ul>
515 * <li>C - Clear</li>
516 * <li>S - Safe(SSL protocol only)</li>
517 * <li>E - Confidential(SSL protocol only)</li>
518 * <li>P - Private</li>
519 * </ul>
520 * <b>N.B.</b> the method calls {@link #setSocketFactory(javax.net.SocketFactory)} and {@link #setServerSocketFactory(javax.net.ServerSocketFactory)}
521 *
522 * @param prot Data Channel Protection Level, if {@code null}, use {@link #DEFAULT_PROT}.
523 * @throws SSLException If the server reply code does not equal {@code 200}.
524 * @throws IOException If an I/O error occurs while sending the command.
525 */
526 public void execPROT(String prot) throws SSLException, IOException {
527 if (prot == null) {
528 prot = DEFAULT_PROT;
529 }
530 if (!checkPROTValue(prot)) {
531 throw new IllegalArgumentException();
532 }
533 if (FTPReply.COMMAND_OK != sendCommand(CMD_PROT, prot)) {
534 throw new SSLException(getReplyString());
535 }
536 if (DEFAULT_PROT.equals(prot)) {
537 setSocketFactory(null);
538 setServerSocketFactory(null);
539 } else {
540 setSocketFactory(new FTPSSocketFactory(context));
541 setServerSocketFactory(new FTPSServerSocketFactory(context));
542 initSslContext();
543 }
544 }
545
546 /**
547 * Extract the data from a reply with a prefix, e.g. PBSZ=1234 => 1234
548 *
549 * @param prefix the prefix to find
550 * @param reply where to find the prefix
551 * @return the remainder of the string after the prefix, or null if the prefix was not present.
552 */
553 private String extractPrefixedData(final String prefix, final String reply) {
554 final int idx = reply.indexOf(prefix);
555 if (idx == -1) {
556 return null;
557 }
558 // N.B. Cannot use trim before substring as leading space would affect the offset.
559 return reply.substring(idx + prefix.length()).trim();
560 }
561
562 /**
563 * Return AUTH command use value.
564 *
565 * @return AUTH command use value.
566 */
567 public String getAuthValue() {
568 return this.auth;
569 }
570
571 /**
572 * Returns the names of the cipher suites which could be enabled for use on this connection. When the underlying {@link Socket} is not an {@link SSLSocket}
573 * instance, returns null.
574 *
575 * @return An array of cipher suite names, or <code>null</code>
576 */
577 public String[] getEnabledCipherSuites() {
578 if (_socket_ instanceof SSLSocket) {
579 return ((SSLSocket) _socket_).getEnabledCipherSuites();
580 }
581 return null;
582 }
583
584 /**
585 * Returns the names of the protocol versions which are currently enabled for use on this connection. When the underlying {@link Socket} is not an
586 * {@link SSLSocket} instance, returns null.
587 *
588 * @return An array of protocols, or <code>null</code>
589 */
590 public String[] getEnabledProtocols() {
591 if (_socket_ instanceof SSLSocket) {
592 return ((SSLSocket) _socket_).getEnabledProtocols();
593 }
594 return null;
595 }
596
597 /**
598 * Returns true if new SSL sessions may be established by this socket. When the underlying {@link Socket} instance is not SSL-enabled (i.e. an instance of
599 * {@link SSLSocket} with {@link SSLSocket}{@link #getEnableSessionCreation()}) enabled, this returns False.
600 *
601 * @return true - Indicates that sessions may be created; this is the default. false - indicates that an existing session must be resumed.
602 */
603 public boolean getEnableSessionCreation() {
604 if (_socket_ instanceof SSLSocket) {
605 return ((SSLSocket) _socket_).getEnableSessionCreation();
606 }
607 return false;
608 }
609
610 /**
611 * Get the currently configured {@link HostnameVerifier}. The verifier is only used on client mode connections.
612 *
613 * @return A HostnameVerifier instance.
614 * @since 3.4
615 */
616 public HostnameVerifier getHostnameVerifier() {
617 return hostnameVerifier;
618 }
619
620 /**
621 * Gets the {@link KeyManager} instance.
622 *
623 * @return The {@link KeyManager} instance
624 */
625 private KeyManager getKeyManager() {
626 return keyManager;
627 }
628
629 /**
630 * Returns true if the socket will require client authentication. When the underlying {@link Socket} is not an {@link SSLSocket} instance, returns false.
631 *
632 * @return true - If the server mode socket should request that the client authenticate itself.
633 */
634 public boolean getNeedClientAuth() {
635 if (_socket_ instanceof SSLSocket) {
636 return ((SSLSocket) _socket_).getNeedClientAuth();
637 }
638 return false;
639 }
640
641 /**
642 * Get the currently configured {@link TrustManager}.
643 *
644 * @return A TrustManager instance.
645 */
646 public TrustManager getTrustManager() {
647 return trustManager;
648 }
649
650 /**
651 * Returns true if the socket is set to use client mode in its first handshake. When the underlying {@link Socket} is not an {@link SSLSocket} instance,
652 * returns false.
653 *
654 * @return true - If the socket should start its first handshake in "client" mode.
655 */
656 public boolean getUseClientMode() {
657 if (_socket_ instanceof SSLSocket) {
658 return ((SSLSocket) _socket_).getUseClientMode();
659 }
660 return false;
661 }
662
663 /**
664 * Returns true if the socket will request client authentication. When the underlying {@link Socket} is not an {@link SSLSocket} instance, returns false.
665 *
666 * @return true - If the server mode socket should request that the client authenticate itself.
667 */
668 public boolean getWantClientAuth() {
669 if (_socket_ instanceof SSLSocket) {
670 return ((SSLSocket) _socket_).getWantClientAuth();
671 }
672 return false;
673 }
674
675 /**
676 * Performs a lazy init of the SSL context
677 *
678 * @throws IOException
679 */
680 private void initSslContext() throws IOException {
681 if (context == null) {
682 context = SSLContextUtils.createSSLContext(protocol, getKeyManager(), getTrustManager());
683 }
684 }
685
686 /**
687 * 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.
688 *
689 * This check is only performed on client mode connections.
690 *
691 * @return True if enabled, false if not.
692 * @since 3.4
693 */
694 public boolean isEndpointCheckingEnabled() {
695 return tlsEndpointChecking;
696 }
697
698 /**
699 * Establishes a data connection with the FTP server, returning a Socket for the connection if successful. If a restart offset has been set with
700 * {@link #setRestartOffset(long)}, a REST command is issued to the server with the offset as an argument before establishing the data connection. Active
701 * mode connections also cause a local PORT command to be issued.
702 *
703 * @param command The text representation of the FTP command to send.
704 * @param arg The arguments to the FTP command. If this parameter is set to null, then the command is sent with no argument.
705 * @return A Socket corresponding to the established data connection. Null is returned if an FTP protocol error is reported at any point during the
706 * establishment and initialization of the connection.
707 * @throws IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
708 * @since 3.1
709 */
710 private Socket openDataSecureConnection(final String command, final String arg) throws IOException {
711 if (getDataConnectionMode() != ACTIVE_LOCAL_DATA_CONNECTION_MODE && getDataConnectionMode() != PASSIVE_LOCAL_DATA_CONNECTION_MODE) {
712 return null;
713 }
714
715 final boolean isInet6Address = getRemoteAddress() instanceof Inet6Address;
716
717 final Socket socket;
718 Socket sslSocket = null;
719 final int soTimeoutMillis = DurationUtils.toMillisInt(getDataTimeout());
720 if (getDataConnectionMode() == ACTIVE_LOCAL_DATA_CONNECTION_MODE) {
721 // if no activePortRange was set (correctly) -> getActivePort() = 0
722 // -> new ServerSocket(0) -> bind to any free local port
723 try (final ServerSocket server = _serverSocketFactory_.createServerSocket(getActivePort(), 1, getHostAddress())) {
724 // Try EPRT only if remote server is over IPv6, if not use PORT,
725 // because EPRT has no advantage over PORT on IPv4.
726 // It could even have the disadvantage,
727 // that EPRT will make the data connection fail, because
728 // today's intelligent NAT Firewalls are able to
729 // substitute IP addresses in the PORT command,
730 // but might not be able to recognize the EPRT command.
731 if (isInet6Address) {
732 if (!FTPReply.isPositiveCompletion(eprt(getReportHostAddress(), server.getLocalPort()))) {
733 return null;
734 }
735 } else if (!FTPReply.isPositiveCompletion(port(getReportHostAddress(), server.getLocalPort()))) {
736 return null;
737 }
738
739 if (getRestartOffset() > 0 && !restart(getRestartOffset())) {
740 return null;
741 }
742
743 if (!FTPReply.isPositivePreliminary(sendCommand(command, arg))) {
744 return null;
745 }
746
747 // For now, let's just use the data timeout value for waiting for
748 // the data connection. It may be desirable to let this be a
749 // separately configurable value. In any case, we really want
750 // to allow preventing the accept from blocking indefinitely.
751 if (soTimeoutMillis >= 0) {
752 server.setSoTimeout(soTimeoutMillis);
753 }
754 socket = server.accept();
755
756 // Ensure the timeout is set before any commands are issued on the new socket
757 if (soTimeoutMillis >= 0) {
758 socket.setSoTimeout(soTimeoutMillis);
759 }
760 if (getReceiveDataSocketBufferSize() > 0) {
761 socket.setReceiveBufferSize(getReceiveDataSocketBufferSize());
762 }
763 if (getSendDataSocketBufferSize() > 0) {
764 socket.setSendBufferSize(getSendDataSocketBufferSize());
765 }
766 }
767 } else { // We must be in PASSIVE_LOCAL_DATA_CONNECTION_MODE
768
769 // Try EPSV command first on IPv6 - and IPv4 if enabled.
770 // When using IPv4 with NAT it has the advantage
771 // to work with more rare configurations.
772 // E.g. if FTP server has a static PASV address (external network)
773 // and the client is coming from another internal network.
774 // In that case the data connection after PASV command would fail,
775 // while EPSV would make the client succeed by taking just the port.
776 final boolean attemptEPSV = isUseEPSVwithIPv4() || isInet6Address;
777 if (attemptEPSV && epsv() == FTPReply.ENTERING_EPSV_MODE) {
778 _parseExtendedPassiveModeReply(_replyLines.get(0));
779 } else {
780 if (isInet6Address) {
781 return null; // Must use EPSV for IPV6
782 }
783 // If EPSV failed on IPV4, revert to PASV
784 if (pasv() != FTPReply.ENTERING_PASSIVE_MODE) {
785 return null;
786 }
787 _parsePassiveModeReply(_replyLines.get(0));
788 }
789
790 if (getProxy() != null) {
791 socket = new Socket(getProxy());
792 } else {
793 socket = _socketFactory_.createSocket();
794 }
795
796 if (getReceiveDataSocketBufferSize() > 0) {
797 socket.setReceiveBufferSize(getReceiveDataSocketBufferSize());
798 }
799 if (getSendDataSocketBufferSize() > 0) {
800 socket.setSendBufferSize(getSendDataSocketBufferSize());
801 }
802 if (getPassiveLocalIPAddress() != null) {
803 socket.bind(new InetSocketAddress(getPassiveLocalIPAddress(), 0));
804 }
805
806 // For now, let's just use the data timeout value for waiting for
807 // the data connection. It may be desirable to let this be a
808 // separately configurable value. In any case, we really want
809 // to allow preventing the accept from blocking indefinitely.
810 if (soTimeoutMillis >= 0) {
811 socket.setSoTimeout(soTimeoutMillis);
812 }
813
814 socket.connect(new InetSocketAddress(getPassiveHost(), getPassivePort()), connectTimeout);
815
816 if (getProxy() != null) {
817 sslSocket = context.getSocketFactory().createSocket(socket, getPassiveHost(), getPassivePort(), true);
818 }
819
820 if (getRestartOffset() > 0 && !restart(getRestartOffset())) {
821 closeSockets(socket, sslSocket);
822 return null;
823 }
824
825 if (!FTPReply.isPositivePreliminary(sendCommand(command, arg))) {
826 closeSockets(socket, sslSocket);
827 return null;
828 }
829 }
830
831 if (isRemoteVerificationEnabled() && !verifyRemote(socket)) {
832 // Grab the host before we close the socket to avoid NET-663
833 final InetAddress socketHost = socket.getInetAddress();
834
835 closeSockets(socket, sslSocket);
836
837 throw new IOException(
838 "Host attempting data connection " + socketHost.getHostAddress() + " is not same as server " + getRemoteAddress().getHostAddress());
839 }
840
841 return getProxy() != null ? sslSocket : socket;
842 }
843
844 /**
845 * Parses the given ADAT response line and base64-decodes the data.
846 *
847 * @param reply The ADAT reply to parse.
848 * @return the data in the reply, base64-decoded.
849 * @since 3.0
850 */
851 public byte[] parseADATReply(final String reply) {
852 if (reply == null) {
853 return null;
854 }
855 return Base64.getDecoder().decode(extractPrefixedData("ADAT=", reply));
856 }
857
858 /**
859 * PBSZ command. pbsz value: 0 to (2^32)-1 decimal integer. Issues the command and parses the response to return the negotiated value.
860 *
861 * @param pbsz Protection Buffer Size.
862 * @throws SSLException If the server reply code does not equal "200".
863 * @throws IOException If an I/O error occurs while sending the command.
864 * @return the negotiated value.
865 * @see #execPBSZ(long)
866 * @since 3.0
867 */
868 public long parsePBSZ(final long pbsz) throws SSLException, IOException {
869 execPBSZ(pbsz);
870 long minvalue = pbsz;
871 final String remainder = extractPrefixedData("PBSZ=", getReplyString());
872 if (remainder != null) {
873 final long replysz = Long.parseLong(remainder);
874 if (replysz < minvalue) {
875 minvalue = replysz;
876 }
877 }
878 return minvalue;
879 }
880
881 /**
882 * Send an FTP command. A successful CCC (Clear Command Channel) command causes the underlying {@link SSLSocket} instance to be assigned to a plain
883 * {@link Socket}
884 *
885 * @param command The FTP command.
886 * @return server reply.
887 * @throws IOException If an I/O error occurs while sending the command.
888 * @throws SSLException if a CCC command fails
889 * @see org.apache.commons.net.ftp.FTP#sendCommand(String)
890 */
891 // Would like to remove this method, but that will break any existing clients that are using CCC
892 @Override
893 public int sendCommand(final String command, final String args) throws IOException {
894 final int repCode = super.sendCommand(command, args);
895 /* If CCC is issued, restore socket i/o streams to unsecured versions */
896 if (CMD_CCC.equals(command)) {
897 if (FTPReply.COMMAND_OK != repCode) {
898 throw new SSLException(getReplyString());
899 }
900 _socket_.close();
901 _socket_ = plainSocket;
902 _controlInput_ = new BufferedReader(new InputStreamReader(_socket_.getInputStream(), getControlEncoding()));
903 _controlOutput_ = new BufferedWriter(new OutputStreamWriter(_socket_.getOutputStream(), getControlEncoding()));
904 }
905 return repCode;
906 }
907
908 /**
909 * Set AUTH command use value. This processing is done before connected processing.
910 *
911 * @param auth AUTH command use value.
912 */
913 public void setAuthValue(final String auth) {
914 this.auth = auth;
915 }
916
917 /**
918 * Controls which particular cipher suites are enabled for use on this connection. Called before server negotiation.
919 *
920 * @param cipherSuites The cipher suites.
921 */
922 public void setEnabledCipherSuites(final String[] cipherSuites) {
923 suites = cipherSuites.clone();
924 }
925
926 /**
927 * Controls which particular protocol versions are enabled for use on this connection. I perform setting before a server negotiation.
928 *
929 * @param protocolVersions The protocol versions.
930 */
931 public void setEnabledProtocols(final String[] protocolVersions) {
932 protocols = protocolVersions.clone();
933 }
934
935 /**
936 * Controls whether a new SSL session may be established by this socket.
937 *
938 * @param isCreation The established socket flag.
939 */
940 public void setEnabledSessionCreation(final boolean isCreation) {
941 this.isCreation = isCreation;
942 }
943
944 /**
945 * Automatic endpoint identification checking using the HTTPS algorithm is supported on Java 1.7+. The default behavior is for this to be disabled.
946 *
947 * This check is only performed on client mode connections.
948 *
949 * @param enable Enable automatic endpoint identification checking using the HTTPS algorithm on Java 1.7+.
950 * @since 3.4
951 */
952 public void setEndpointCheckingEnabled(final boolean enable) {
953 tlsEndpointChecking = enable;
954 }
955
956 /**
957 * Override the default {@link HostnameVerifier} to use. The verifier is only used on client mode connections.
958 *
959 * @param newHostnameVerifier The HostnameVerifier implementation to set or <code>null</code> to disable.
960 * @since 3.4
961 */
962 public void setHostnameVerifier(final HostnameVerifier newHostnameVerifier) {
963 hostnameVerifier = newHostnameVerifier;
964 }
965
966 /**
967 * Set a {@link KeyManager} to use
968 *
969 * @param keyManager The KeyManager implementation to set.
970 * @see org.apache.commons.net.util.KeyManagerUtils
971 */
972 public void setKeyManager(final KeyManager keyManager) {
973 this.keyManager = keyManager;
974 }
975
976 // DEPRECATED - for API compatibility only - DO NOT USE
977
978 /**
979 * Configures the socket to require client authentication.
980 *
981 * @param isNeedClientAuth The need client auth flag.
982 */
983 public void setNeedClientAuth(final boolean isNeedClientAuth) {
984 this.isNeedClientAuth = isNeedClientAuth;
985 }
986
987 /**
988 * Override the default {@link TrustManager} to use; if set to {@code null}, the default TrustManager from the JVM will be used.
989 *
990 * @param trustManager The TrustManager implementation to set, may be {@code null}
991 * @see org.apache.commons.net.util.TrustManagerUtils
992 */
993 public void setTrustManager(final TrustManager trustManager) {
994 this.trustManager = trustManager;
995 }
996
997 /**
998 * Configures the socket to use client (or server) mode in its first handshake.
999 *
1000 * @param isClientMode The use client mode flag.
1001 */
1002 public void setUseClientMode(final boolean isClientMode) {
1003 this.isClientMode = isClientMode;
1004 }
1005
1006 /**
1007 * Configures the socket to request client authentication, but only if such a request is appropriate to the cipher suite negotiated.
1008 *
1009 * @param isWantClientAuth The want client auth flag.
1010 */
1011 public void setWantClientAuth(final boolean isWantClientAuth) {
1012 this.isWantClientAuth = isWantClientAuth;
1013 }
1014
1015 /**
1016 * SSL/TLS negotiation. Acquires an SSL socket of a control connection and carries out handshake processing.
1017 *
1018 * @throws IOException If server negotiation fails
1019 */
1020 protected void sslNegotiation() throws IOException {
1021 plainSocket = _socket_;
1022 initSslContext();
1023 final SSLSocket socket = createSSLSocket(_socket_);
1024 socket.setEnableSessionCreation(isCreation);
1025 socket.setUseClientMode(isClientMode);
1026
1027 // client mode
1028 if (isClientMode) {
1029 if (tlsEndpointChecking) {
1030 SSLSocketUtils.enableEndpointNameVerification(socket);
1031 }
1032 } else { // server mode
1033 socket.setNeedClientAuth(isNeedClientAuth);
1034 socket.setWantClientAuth(isWantClientAuth);
1035 }
1036
1037 if (protocols != null) {
1038 socket.setEnabledProtocols(protocols);
1039 }
1040 if (suites != null) {
1041 socket.setEnabledCipherSuites(suites);
1042 }
1043 socket.startHandshake();
1044
1045 // TODO the following setup appears to duplicate that in the super class methods
1046 _socket_ = socket;
1047 _controlInput_ = new BufferedReader(new InputStreamReader(socket.getInputStream(), getControlEncoding()));
1048 _controlOutput_ = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), getControlEncoding()));
1049
1050 if (isClientMode && hostnameVerifier != null && !hostnameVerifier.verify(_hostname_, socket.getSession())) {
1051 throw new SSLHandshakeException("Hostname doesn't match certificate");
1052 }
1053 }
1054
1055 }
1056