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92ae4c86 | 1 | /* |
bf95c10a | 2 | * Copyright (C) 1996-2022 The Squid Software Foundation and contributors |
bbc27441 AJ |
3 | * |
4 | * Squid software is distributed under GPLv2+ license and includes | |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
92ae4c86 AR |
7 | */ |
8 | ||
bbc27441 AJ |
9 | /* DEBUG: section 33 Transfer protocol servers */ |
10 | ||
92ae4c86 | 11 | #include "squid.h" |
ec69bdb2 | 12 | #include "acl/FilledChecklist.h" |
1ab04517 | 13 | #include "base/CharacterSet.h" |
675b8408 | 14 | #include "base/Raw.h" |
aea65fec | 15 | #include "base/RefCount.h" |
92ae4c86 | 16 | #include "base/Subscription.h" |
27c841f6 AR |
17 | #include "client_side_reply.h" |
18 | #include "client_side_request.h" | |
92ae4c86 AR |
19 | #include "clientStream.h" |
20 | #include "comm/ConnOpener.h" | |
21 | #include "comm/Read.h" | |
22 | #include "comm/TcpAcceptor.h" | |
23 | #include "comm/Write.h" | |
92ae4c86 AR |
24 | #include "errorpage.h" |
25 | #include "fd.h" | |
1ab04517 | 26 | #include "ftp/Elements.h" |
92ae4c86 AR |
27 | #include "ftp/Parsing.h" |
28 | #include "globals.h" | |
9bafa70d | 29 | #include "http/one/RequestParser.h" |
d3dddfb5 | 30 | #include "http/Stream.h" |
92ae4c86 AR |
31 | #include "HttpHdrCc.h" |
32 | #include "ip/tools.h" | |
33 | #include "ipc/FdNotes.h" | |
1ab04517 | 34 | #include "parser/Tokenizer.h" |
92ae4c86 AR |
35 | #include "servers/forward.h" |
36 | #include "servers/FtpServer.h" | |
37 | #include "SquidConfig.h" | |
38 | #include "StatCounters.h" | |
39 | #include "tools.h" | |
40 | ||
1ab04517 AR |
41 | #include <set> |
42 | #include <map> | |
43 | ||
92ae4c86 AR |
44 | CBDATA_NAMESPACED_CLASS_INIT(Ftp, Server); |
45 | ||
27c841f6 AR |
46 | namespace Ftp |
47 | { | |
92ae4c86 | 48 | static void PrintReply(MemBuf &mb, const HttpReply *reply, const char *const prefix = ""); |
1ab04517 AR |
49 | static bool SupportedCommand(const SBuf &name); |
50 | static bool CommandHasPathParameter(const SBuf &cmd); | |
92ae4c86 AR |
51 | }; |
52 | ||
53 | Ftp::Server::Server(const MasterXaction::Pointer &xact): | |
f53969cc SM |
54 | AsyncJob("Ftp::Server"), |
55 | ConnStateData(xact), | |
56 | master(new MasterState), | |
57 | uri(), | |
58 | host(), | |
59 | gotEpsvAll(false), | |
60 | onDataAcceptCall(), | |
61 | dataListenConn(), | |
62 | dataConn(), | |
63 | uploadAvailSize(0), | |
64 | listener(), | |
2b6b1bcb | 65 | dataConnWait(), |
3238b9b6 CT |
66 | reader(), |
67 | waitingForOrigin(false), | |
68 | originDataDownloadAbortedOnError(false) | |
92ae4c86 | 69 | { |
92ae4c86 | 70 | flags.readMore = false; // we need to announce ourselves first |
4579a6d0 | 71 | *uploadBuf = 0; |
92ae4c86 AR |
72 | } |
73 | ||
74 | Ftp::Server::~Server() | |
75 | { | |
76 | closeDataConnection(); | |
77 | } | |
78 | ||
79 | int | |
80 | Ftp::Server::pipelinePrefetchMax() const | |
81 | { | |
82 | return 0; // no support for concurrent FTP requests | |
83 | } | |
84 | ||
85 | time_t | |
86 | Ftp::Server::idleTimeout() const | |
87 | { | |
88 | return Config.Timeout.ftpClientIdle; | |
89 | } | |
90 | ||
91 | void | |
92 | Ftp::Server::start() | |
93 | { | |
94 | ConnStateData::start(); | |
95 | ||
96 | if (transparent()) { | |
97 | char buf[MAX_IPSTRLEN]; | |
98 | clientConnection->local.toUrl(buf, MAX_IPSTRLEN); | |
99 | host = buf; | |
1ab04517 | 100 | calcUri(NULL); |
e7ce227f | 101 | debugs(33, 5, "FTP transparent URL: " << uri); |
92ae4c86 AR |
102 | } |
103 | ||
104 | writeEarlyReply(220, "Service ready"); | |
105 | } | |
106 | ||
107 | /// schedules another data connection read if needed | |
108 | void | |
109 | Ftp::Server::maybeReadUploadData() | |
110 | { | |
111 | if (reader != NULL) | |
112 | return; | |
113 | ||
114 | const size_t availSpace = sizeof(uploadBuf) - uploadAvailSize; | |
115 | if (availSpace <= 0) | |
116 | return; | |
117 | ||
e7ce227f | 118 | debugs(33, 4, dataConn << ": reading FTP data..."); |
92ae4c86 AR |
119 | |
120 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
121 | reader = JobCallback(33, 5, Dialer, this, Ftp::Server::readUploadData); | |
122 | comm_read(dataConn, uploadBuf + uploadAvailSize, availSpace, | |
123 | reader); | |
124 | } | |
125 | ||
126 | /// react to the freshly parsed request | |
127 | void | |
128 | Ftp::Server::doProcessRequest() | |
129 | { | |
130 | // zero pipelinePrefetchMax() ensures that there is only parsed request | |
e500cc89 | 131 | Must(pipeline.count() == 1); |
d3dddfb5 | 132 | Http::StreamPointer context = pipeline.front(); |
efd5e784 | 133 | Must(context != nullptr); |
92ae4c86 AR |
134 | |
135 | ClientHttpRequest *const http = context->http; | |
136 | assert(http != NULL); | |
92ae4c86 | 137 | |
eacfca83 AR |
138 | HttpRequest *const request = http->request; |
139 | Must(http->storeEntry() || request); | |
140 | const bool mayForward = !http->storeEntry() && handleRequest(request); | |
92ae4c86 AR |
141 | |
142 | if (http->storeEntry() != NULL) { | |
143 | debugs(33, 4, "got an immediate response"); | |
92ae4c86 AR |
144 | clientSetKeepaliveFlag(http); |
145 | context->pullData(); | |
eacfca83 | 146 | } else if (mayForward) { |
92ae4c86 AR |
147 | debugs(33, 4, "forwarding request to server side"); |
148 | assert(http->storeEntry() == NULL); | |
9bafa70d | 149 | clientProcessRequest(this, Http1::RequestParserPointer(), context.getRaw()); |
92ae4c86 AR |
150 | } else { |
151 | debugs(33, 4, "will resume processing later"); | |
152 | } | |
153 | } | |
154 | ||
155 | void | |
6b2b6cfe | 156 | Ftp::Server::processParsedRequest(Http::StreamPointer &) |
92ae4c86 | 157 | { |
e500cc89 | 158 | Must(pipeline.count() == 1); |
eacfca83 | 159 | |
92ae4c86 AR |
160 | // Process FTP request asynchronously to make sure FTP |
161 | // data connection accept callback is fired first. | |
162 | CallJobHere(33, 4, CbcPointer<Server>(this), | |
163 | Ftp::Server, doProcessRequest); | |
164 | } | |
165 | ||
166 | /// imports more upload data from the data connection | |
167 | void | |
168 | Ftp::Server::readUploadData(const CommIoCbParams &io) | |
169 | { | |
e7ce227f | 170 | debugs(33, 5, io.conn << " size " << io.size); |
92ae4c86 AR |
171 | Must(reader != NULL); |
172 | reader = NULL; | |
173 | ||
174 | assert(Comm::IsConnOpen(dataConn)); | |
175 | assert(io.conn->fd == dataConn->fd); | |
176 | ||
177 | if (io.flag == Comm::OK && bodyPipe != NULL) { | |
178 | if (io.size > 0) { | |
a0864754 | 179 | statCounter.client_http.kbytes_in += io.size; |
92ae4c86 AR |
180 | |
181 | char *const current_buf = uploadBuf + uploadAvailSize; | |
182 | if (io.buf != current_buf) | |
183 | memmove(current_buf, io.buf, io.size); | |
184 | uploadAvailSize += io.size; | |
185 | shovelUploadData(); | |
186 | } else if (io.size == 0) { | |
e7ce227f | 187 | debugs(33, 5, io.conn << " closed"); |
92ae4c86 AR |
188 | closeDataConnection(); |
189 | if (uploadAvailSize <= 0) | |
190 | finishDechunkingRequest(true); | |
191 | } | |
192 | } else { // not Comm::Flags::OK or unexpected read | |
e7ce227f | 193 | debugs(33, 5, io.conn << " closed"); |
92ae4c86 AR |
194 | closeDataConnection(); |
195 | finishDechunkingRequest(false); | |
196 | } | |
197 | ||
198 | } | |
199 | ||
200 | /// shovel upload data from the internal buffer to the body pipe if possible | |
201 | void | |
202 | Ftp::Server::shovelUploadData() | |
203 | { | |
204 | assert(bodyPipe != NULL); | |
205 | ||
e7ce227f | 206 | debugs(33, 5, "handling FTP request data for " << clientConnection); |
92ae4c86 | 207 | const size_t putSize = bodyPipe->putMoreData(uploadBuf, |
27c841f6 | 208 | uploadAvailSize); |
92ae4c86 AR |
209 | if (putSize > 0) { |
210 | uploadAvailSize -= putSize; | |
211 | if (uploadAvailSize > 0) | |
212 | memmove(uploadBuf, uploadBuf + putSize, uploadAvailSize); | |
213 | } | |
214 | ||
215 | if (Comm::IsConnOpen(dataConn)) | |
216 | maybeReadUploadData(); | |
217 | else if (uploadAvailSize <= 0) | |
218 | finishDechunkingRequest(true); | |
219 | } | |
220 | ||
221 | void | |
222 | Ftp::Server::noteMoreBodySpaceAvailable(BodyPipe::Pointer) | |
223 | { | |
4309d507 CT |
224 | if (!isOpen()) // if we are closing, nothing to do |
225 | return; | |
226 | ||
92ae4c86 AR |
227 | shovelUploadData(); |
228 | } | |
229 | ||
230 | void | |
231 | Ftp::Server::noteBodyConsumerAborted(BodyPipe::Pointer ptr) | |
232 | { | |
4309d507 CT |
233 | if (!isOpen()) // if we are closing, nothing to do |
234 | return; | |
235 | ||
92ae4c86 AR |
236 | ConnStateData::noteBodyConsumerAborted(ptr); |
237 | closeDataConnection(); | |
238 | } | |
239 | ||
240 | /// accept a new FTP control connection and hand it to a dedicated Server | |
241 | void | |
242 | Ftp::Server::AcceptCtrlConnection(const CommAcceptCbParams ¶ms) | |
243 | { | |
ad05b958 | 244 | Assure(params.port); |
92ae4c86 AR |
245 | |
246 | // NP: it is possible the port was reconfigured when the call or accept() was queued. | |
247 | ||
248 | if (params.flag != Comm::OK) { | |
249 | // Its possible the call was still queued when the client disconnected | |
ad05b958 | 250 | debugs(33, 2, params.port->listenConn << ": FTP accept failure: " << xstrerr(params.xerrno)); |
92ae4c86 AR |
251 | return; |
252 | } | |
253 | ||
e7ce227f | 254 | debugs(33, 4, params.conn << ": accepted"); |
92ae4c86 AR |
255 | fd_note(params.conn->fd, "client ftp connect"); |
256 | ||
ad05b958 EB |
257 | const auto xact = MasterXaction::MakePortful(params.port); |
258 | xact->tcpClient = params.conn; | |
259 | ||
92ae4c86 | 260 | AsyncJob::Start(new Server(xact)); |
ad05b958 | 261 | // XXX: do not abandon the MasterXaction object |
92ae4c86 AR |
262 | } |
263 | ||
264 | void | |
265 | Ftp::StartListening() | |
266 | { | |
267 | for (AnyP::PortCfgPointer s = FtpPortList; s != NULL; s = s->next) { | |
268 | if (MAXTCPLISTENPORTS == NHttpSockets) { | |
269 | debugs(1, DBG_IMPORTANT, "Ignoring ftp_port lines exceeding the" << | |
270 | " limit of " << MAXTCPLISTENPORTS << " ports."); | |
271 | break; | |
272 | } | |
273 | ||
274 | // direct new connections accepted by listenConn to Accept() | |
275 | typedef CommCbFunPtrCallT<CommAcceptCbPtrFun> AcceptCall; | |
276 | RefCount<AcceptCall> subCall = commCbCall(5, 5, "Ftp::Server::AcceptCtrlConnection", | |
27c841f6 | 277 | CommAcceptCbPtrFun(Ftp::Server::AcceptCtrlConnection, |
f53969cc | 278 | CommAcceptCbParams(NULL))); |
92ae4c86 AR |
279 | clientStartListeningOn(s, subCall, Ipc::fdnFtpSocket); |
280 | } | |
281 | } | |
282 | ||
283 | void | |
284 | Ftp::StopListening() | |
285 | { | |
ecba3352 | 286 | for (AnyP::PortCfgPointer s = FtpPortList; s != NULL; s = s->next) { |
92ae4c86 AR |
287 | if (s->listenConn != NULL) { |
288 | debugs(1, DBG_IMPORTANT, "Closing FTP port " << s->listenConn->local); | |
289 | s->listenConn->close(); | |
290 | s->listenConn = NULL; | |
291 | } | |
292 | } | |
293 | } | |
294 | ||
295 | void | |
296 | Ftp::Server::notePeerConnection(Comm::ConnectionPointer conn) | |
297 | { | |
298 | // find request | |
d3dddfb5 | 299 | Http::StreamPointer context = pipeline.front(); |
efd5e784 | 300 | Must(context != nullptr); |
92ae4c86 AR |
301 | ClientHttpRequest *const http = context->http; |
302 | Must(http != NULL); | |
303 | HttpRequest *const request = http->request; | |
304 | Must(request != NULL); | |
92ae4c86 | 305 | // make FTP peer connection exclusive to our request |
801cfc26 | 306 | pinBusyConnection(conn, request); |
92ae4c86 AR |
307 | } |
308 | ||
309 | void | |
310 | Ftp::Server::clientPinnedConnectionClosed(const CommCloseCbParams &io) | |
311 | { | |
312 | ConnStateData::clientPinnedConnectionClosed(io); | |
313 | ||
92cfc72f CT |
314 | // TODO: Keep the control connection open after fixing the reset |
315 | // problem below | |
316 | if (Comm::IsConnOpen(clientConnection)) | |
317 | clientConnection->close(); | |
e7ce227f | 318 | |
92cfc72f | 319 | // TODO: If the server control connection is gone, reset state to login |
2f8abb64 | 320 | // again. Resetting login alone is not enough: FtpRelay::sendCommand() will |
51edd95f | 321 | // not re-login because FtpRelay::serverState() is not going to be |
92cfc72f CT |
322 | // fssConnected. Calling resetLogin() alone is also harmful because |
323 | // it does not reset correctly the client-to-squid control connection (eg | |
324 | // respond if required with an error code, in all cases) | |
325 | // resetLogin("control connection closure"); | |
92ae4c86 AR |
326 | } |
327 | ||
e7ce227f AR |
328 | /// clear client and server login-related state after the old login is gone |
329 | void | |
330 | Ftp::Server::resetLogin(const char *reason) | |
331 | { | |
332 | debugs(33, 5, "will need to re-login due to " << reason); | |
aea65fec | 333 | master->clientReadGreeting = false; |
e7ce227f AR |
334 | changeState(fssBegin, reason); |
335 | } | |
336 | ||
92ae4c86 AR |
337 | /// computes uri member from host and, if tracked, working dir with file name |
338 | void | |
1ab04517 | 339 | Ftp::Server::calcUri(const SBuf *file) |
92ae4c86 | 340 | { |
c8ab5ec6 | 341 | // TODO: fill a class AnyP::Uri instead of string |
92ae4c86 AR |
342 | uri = "ftp://"; |
343 | uri.append(host); | |
aea65fec AR |
344 | if (port->ftp_track_dirs && master->workingDir.length()) { |
345 | if (master->workingDir[0] != '/') | |
ab4c5a36 | 346 | uri.append("/", 1); |
aea65fec | 347 | uri.append(master->workingDir); |
92ae4c86 AR |
348 | } |
349 | ||
1ab04517 | 350 | if (uri[uri.length() - 1] != '/') |
ab4c5a36 | 351 | uri.append("/", 1); |
92ae4c86 AR |
352 | |
353 | if (port->ftp_track_dirs && file) { | |
1ab04517 AR |
354 | static const CharacterSet Slash("/", "/"); |
355 | Parser::Tokenizer tok(*file); | |
356 | tok.skipAll(Slash); | |
357 | uri.append(tok.remaining()); | |
92ae4c86 AR |
358 | } |
359 | } | |
360 | ||
361 | /// Starts waiting for a data connection. Returns listening port. | |
362 | /// On errors, responds with an error and returns zero. | |
363 | unsigned int | |
364 | Ftp::Server::listenForDataConnection() | |
365 | { | |
366 | closeDataConnection(); | |
367 | ||
368 | Comm::ConnectionPointer conn = new Comm::Connection; | |
369 | conn->flags = COMM_NONBLOCKING; | |
370 | conn->local = transparent() ? port->s : clientConnection->local; | |
371 | conn->local.port(0); | |
1ab04517 | 372 | const char *const note = uri.c_str(); |
92ae4c86 AR |
373 | comm_open_listener(SOCK_STREAM, IPPROTO_TCP, conn, note); |
374 | if (!Comm::IsConnOpen(conn)) { | |
d816f28d | 375 | debugs(5, DBG_CRITICAL, "ERROR: comm_open_listener failed for FTP data: " << |
92ae4c86 AR |
376 | conn->local << " error: " << errno); |
377 | writeCustomReply(451, "Internal error"); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | typedef CommCbMemFunT<Server, CommAcceptCbParams> AcceptDialer; | |
382 | typedef AsyncCallT<AcceptDialer> AcceptCall; | |
383 | RefCount<AcceptCall> call = static_cast<AcceptCall*>(JobCallback(5, 5, AcceptDialer, this, Ftp::Server::acceptDataConnection)); | |
384 | Subscription::Pointer sub = new CallSubscription<AcceptCall>(call); | |
385 | listener = call.getRaw(); | |
386 | dataListenConn = conn; | |
387 | AsyncJob::Start(new Comm::TcpAcceptor(conn, note, sub)); | |
388 | ||
389 | const unsigned int listeningPort = comm_local_port(conn->fd); | |
390 | conn->local.port(listeningPort); | |
391 | return listeningPort; | |
392 | } | |
393 | ||
394 | void | |
395 | Ftp::Server::acceptDataConnection(const CommAcceptCbParams ¶ms) | |
396 | { | |
397 | if (params.flag != Comm::OK) { | |
398 | // Its possible the call was still queued when the client disconnected | |
399 | debugs(33, 2, dataListenConn << ": accept " | |
400 | "failure: " << xstrerr(params.xerrno)); | |
401 | return; | |
402 | } | |
403 | ||
404 | debugs(33, 4, "accepted " << params.conn); | |
405 | fd_note(params.conn->fd, "passive client ftp data"); | |
92ae4c86 AR |
406 | |
407 | if (!clientConnection) { | |
408 | debugs(33, 5, "late data connection?"); | |
409 | closeDataConnection(); // in case we are still listening | |
410 | params.conn->close(); | |
27c841f6 | 411 | } else if (params.conn->remote != clientConnection->remote) { |
92ae4c86 AR |
412 | debugs(33, 2, "rogue data conn? ctrl: " << clientConnection->remote); |
413 | params.conn->close(); | |
414 | // Some FTP servers close control connection here, but it may make | |
415 | // things worse from DoS p.o.v. and no better from data stealing p.o.v. | |
416 | } else { | |
417 | closeDataConnection(); | |
418 | dataConn = params.conn; | |
4831b46c | 419 | dataConn->leaveOrphanage(); |
92ae4c86 AR |
420 | uploadAvailSize = 0; |
421 | debugs(33, 7, "ready for data"); | |
422 | if (onDataAcceptCall != NULL) { | |
423 | AsyncCall::Pointer call = onDataAcceptCall; | |
424 | onDataAcceptCall = NULL; | |
425 | // If we got an upload request, start reading data from the client. | |
aea65fec | 426 | if (master->serverState == fssHandleUploadRequest) |
92ae4c86 AR |
427 | maybeReadUploadData(); |
428 | else | |
aea65fec | 429 | Must(master->serverState == fssHandleDataRequest); |
92ae4c86 AR |
430 | MemBuf mb; |
431 | mb.init(); | |
4391cd15 | 432 | mb.appendf("150 Data connection opened.\r\n"); |
92ae4c86 AR |
433 | Comm::Write(clientConnection, &mb, call); |
434 | } | |
435 | } | |
436 | } | |
437 | ||
438 | void | |
439 | Ftp::Server::closeDataConnection() | |
440 | { | |
441 | if (listener != NULL) { | |
442 | listener->cancel("no longer needed"); | |
443 | listener = NULL; | |
444 | } | |
445 | ||
446 | if (Comm::IsConnOpen(dataListenConn)) { | |
e7ce227f | 447 | debugs(33, 5, "FTP closing client data listen socket: " << |
92ae4c86 AR |
448 | *dataListenConn); |
449 | dataListenConn->close(); | |
450 | } | |
451 | dataListenConn = NULL; | |
452 | ||
453 | if (reader != NULL) { | |
454 | // Comm::ReadCancel can deal with negative FDs | |
455 | Comm::ReadCancel(dataConn->fd, reader); | |
456 | reader = NULL; | |
457 | } | |
458 | ||
459 | if (Comm::IsConnOpen(dataConn)) { | |
e7ce227f | 460 | debugs(33, 5, "FTP closing client data connection: " << |
92ae4c86 AR |
461 | *dataConn); |
462 | dataConn->close(); | |
463 | } | |
464 | dataConn = NULL; | |
465 | } | |
466 | ||
467 | /// Writes FTP [error] response before we fully parsed the FTP request and | |
468 | /// created the corresponding HTTP request wrapper for that FTP request. | |
469 | void | |
470 | Ftp::Server::writeEarlyReply(const int code, const char *msg) | |
471 | { | |
e7ce227f | 472 | debugs(33, 7, code << ' ' << msg); |
92ae4c86 AR |
473 | assert(99 < code && code < 1000); |
474 | ||
475 | MemBuf mb; | |
476 | mb.init(); | |
4391cd15 | 477 | mb.appendf("%i %s\r\n", code, msg); |
92ae4c86 AR |
478 | |
479 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
480 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteEarlyReply); | |
481 | Comm::Write(clientConnection, &mb, call); | |
482 | ||
483 | flags.readMore = false; | |
484 | ||
485 | // TODO: Create master transaction. Log it in wroteEarlyReply(). | |
486 | } | |
487 | ||
488 | void | |
489 | Ftp::Server::writeReply(MemBuf &mb) | |
490 | { | |
aea65fec AR |
491 | debugs(9, 2, "FTP Client " << clientConnection); |
492 | debugs(9, 2, "FTP Client REPLY:\n---------\n" << mb.buf << | |
92ae4c86 AR |
493 | "\n----------"); |
494 | ||
495 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
496 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteReply); | |
497 | Comm::Write(clientConnection, &mb, call); | |
498 | } | |
499 | ||
500 | void | |
501 | Ftp::Server::writeCustomReply(const int code, const char *msg, const HttpReply *reply) | |
502 | { | |
e7ce227f | 503 | debugs(33, 7, code << ' ' << msg); |
92ae4c86 AR |
504 | assert(99 < code && code < 1000); |
505 | ||
506 | const bool sendDetails = reply != NULL && | |
789217a2 | 507 | reply->header.has(Http::HdrType::FTP_STATUS) && reply->header.has(Http::HdrType::FTP_REASON); |
92ae4c86 AR |
508 | |
509 | MemBuf mb; | |
510 | mb.init(); | |
511 | if (sendDetails) { | |
4391cd15 AJ |
512 | mb.appendf("%i-%s\r\n", code, msg); |
513 | mb.appendf(" Server reply:\r\n"); | |
92ae4c86 | 514 | Ftp::PrintReply(mb, reply, " "); |
4391cd15 | 515 | mb.appendf("%i \r\n", code); |
92ae4c86 | 516 | } else |
4391cd15 | 517 | mb.appendf("%i %s\r\n", code, msg); |
92ae4c86 AR |
518 | |
519 | writeReply(mb); | |
520 | } | |
521 | ||
522 | void | |
523 | Ftp::Server::changeState(const ServerState newState, const char *reason) | |
524 | { | |
aea65fec AR |
525 | if (master->serverState == newState) { |
526 | debugs(33, 3, "client state unchanged at " << master->serverState << | |
92ae4c86 | 527 | " because " << reason); |
aea65fec | 528 | master->serverState = newState; |
92ae4c86 | 529 | } else { |
aea65fec | 530 | debugs(33, 3, "client state was " << master->serverState << |
92ae4c86 | 531 | ", now " << newState << " because " << reason); |
aea65fec | 532 | master->serverState = newState; |
92ae4c86 AR |
533 | } |
534 | } | |
535 | ||
536 | /// whether the given FTP command has a pathname parameter | |
537 | static bool | |
1ab04517 AR |
538 | Ftp::CommandHasPathParameter(const SBuf &cmd) |
539 | { | |
540 | static std::set<SBuf> PathedCommands; | |
541 | if (!PathedCommands.size()) { | |
542 | PathedCommands.insert(cmdMlst()); | |
543 | PathedCommands.insert(cmdMlsd()); | |
544 | PathedCommands.insert(cmdStat()); | |
545 | PathedCommands.insert(cmdNlst()); | |
546 | PathedCommands.insert(cmdList()); | |
547 | PathedCommands.insert(cmdMkd()); | |
548 | PathedCommands.insert(cmdRmd()); | |
549 | PathedCommands.insert(cmdDele()); | |
550 | PathedCommands.insert(cmdRnto()); | |
551 | PathedCommands.insert(cmdRnfr()); | |
552 | PathedCommands.insert(cmdAppe()); | |
553 | PathedCommands.insert(cmdStor()); | |
554 | PathedCommands.insert(cmdRetr()); | |
555 | PathedCommands.insert(cmdSmnt()); | |
556 | PathedCommands.insert(cmdCwd()); | |
557 | } | |
558 | ||
559 | return PathedCommands.find(cmd) != PathedCommands.end(); | |
92ae4c86 AR |
560 | } |
561 | ||
eacfca83 | 562 | /// creates a context filled with an error message for a given early error |
d3dddfb5 | 563 | Http::Stream * |
eacfca83 AR |
564 | Ftp::Server::earlyError(const EarlyErrorKind eek) |
565 | { | |
566 | /* Default values, to be updated by the switch statement below */ | |
567 | int scode = 421; | |
568 | const char *reason = "Internal error"; | |
569 | const char *errUri = "error:ftp-internal-early-error"; | |
570 | ||
571 | switch (eek) { | |
3aab028c | 572 | case EarlyErrorKind::HugeRequest: |
eacfca83 AR |
573 | scode = 421; |
574 | reason = "Huge request"; | |
575 | errUri = "error:ftp-huge-request"; | |
576 | break; | |
577 | ||
3aab028c | 578 | case EarlyErrorKind::MissingLogin: |
eacfca83 AR |
579 | scode = 530; |
580 | reason = "Must login first"; | |
581 | errUri = "error:ftp-must-login-first"; | |
582 | break; | |
583 | ||
3aab028c | 584 | case EarlyErrorKind::MissingUsername: |
eacfca83 AR |
585 | scode = 501; |
586 | reason = "Missing username"; | |
587 | errUri = "error:ftp-missing-username"; | |
588 | break; | |
589 | ||
3aab028c | 590 | case EarlyErrorKind::MissingHost: |
eacfca83 AR |
591 | scode = 501; |
592 | reason = "Missing host"; | |
593 | errUri = "error:ftp-missing-host"; | |
594 | break; | |
595 | ||
3aab028c | 596 | case EarlyErrorKind::UnsupportedCommand: |
eacfca83 AR |
597 | scode = 502; |
598 | reason = "Unknown or unsupported command"; | |
599 | errUri = "error:ftp-unsupported-command"; | |
600 | break; | |
601 | ||
3aab028c | 602 | case EarlyErrorKind::InvalidUri: |
eacfca83 AR |
603 | scode = 501; |
604 | reason = "Invalid URI"; | |
605 | errUri = "error:ftp-invalid-uri"; | |
606 | break; | |
607 | ||
3aab028c | 608 | case EarlyErrorKind::MalformedCommand: |
eacfca83 AR |
609 | scode = 421; |
610 | reason = "Malformed command"; | |
611 | errUri = "error:ftp-malformed-command"; | |
612 | break; | |
613 | ||
74d4eef6 | 614 | // no default so that a compiler can check that we have covered all cases |
eacfca83 AR |
615 | } |
616 | ||
d3dddfb5 | 617 | Http::Stream *context = abortRequestParsing(errUri); |
eacfca83 AR |
618 | clientStreamNode *node = context->getClientReplyContext(); |
619 | Must(node); | |
620 | clientReplyContext *repContext = dynamic_cast<clientReplyContext *>(node->data.getRaw()); | |
3d01c5ab | 621 | Must(repContext); |
eacfca83 AR |
622 | |
623 | // We cannot relay FTP scode/reason via HTTP-specific ErrorState. | |
624 | // TODO: When/if ErrorState can handle native FTP errors, use it instead. | |
625 | HttpReply *reply = Ftp::HttpReplyWrapper(scode, reason, Http::scBadRequest, -1); | |
626 | repContext->setReplyToReply(reply); | |
627 | return context; | |
628 | } | |
629 | ||
92ae4c86 | 630 | /// Parses a single FTP request on the control connection. |
d3dddfb5 | 631 | /// Returns a new Http::Stream on valid requests and all errors. |
eacfca83 | 632 | /// Returns NULL on incomplete requests that may still succeed given more data. |
d3dddfb5 | 633 | Http::Stream * |
9bafa70d | 634 | Ftp::Server::parseOneRequest() |
92ae4c86 | 635 | { |
eacfca83 AR |
636 | flags.readMore = false; // common for all but one case below |
637 | ||
1ab04517 | 638 | // OWS <command> [ RWS <parameter> ] OWS LF |
aea65fec AR |
639 | |
640 | // InlineSpaceChars are isspace(3) or RFC 959 Section 3.1.1.5.2, except | |
641 | // for the LF character that we must exclude here (but see FullWhiteSpace). | |
642 | static const char * const InlineSpaceChars = " \f\r\t\v"; | |
643 | static const CharacterSet InlineSpace = CharacterSet("Ftp::Inline", InlineSpaceChars); | |
644 | static const CharacterSet FullWhiteSpace = (InlineSpace + CharacterSet::LF).rename("Ftp::FWS"); | |
645 | static const CharacterSet CommandChars = FullWhiteSpace.complement("Ftp::Command"); | |
646 | static const CharacterSet TailChars = CharacterSet::LF.complement("Ftp::Tail"); | |
92ae4c86 | 647 | |
1ab04517 AR |
648 | // This set is used to ignore empty commands without allowing an attacker |
649 | // to keep us endlessly busy by feeding us whitespace or empty commands. | |
aea65fec | 650 | static const CharacterSet &LeadingSpace = FullWhiteSpace; |
92ae4c86 | 651 | |
1ab04517 AR |
652 | SBuf cmd; |
653 | SBuf params; | |
92ae4c86 | 654 | |
fcc444e3 | 655 | Parser::Tokenizer tok(inBuf); |
92ae4c86 | 656 | |
1ab04517 | 657 | (void)tok.skipAll(LeadingSpace); // leading OWS and empty commands |
aea65fec | 658 | const bool parsed = tok.prefix(cmd, CommandChars); // required command |
92ae4c86 | 659 | |
1ab04517 | 660 | // note that the condition below will eat either RWS or trailing OWS |
aea65fec | 661 | if (parsed && tok.skipAll(InlineSpace) && tok.prefix(params, TailChars)) { |
1ab04517 AR |
662 | // now params may include trailing OWS |
663 | // TODO: Support right-trimming using CharacterSet in Tokenizer instead | |
aea65fec | 664 | static const SBuf bufWhiteSpace(InlineSpaceChars); |
1ab04517 | 665 | params.trim(bufWhiteSpace, false, true); |
92ae4c86 AR |
666 | } |
667 | ||
eacfca83 AR |
668 | // Why limit command line and parameters size? Did not we just parse them? |
669 | // XXX: Our good old String cannot handle very long strings. | |
670 | const SBuf::size_type tokenMax = min( | |
74d4eef6 A |
671 | static_cast<SBuf::size_type>(32*1024), // conservative |
672 | static_cast<SBuf::size_type>(Config.maxRequestHeaderSize)); | |
eacfca83 AR |
673 | if (cmd.length() > tokenMax || params.length() > tokenMax) { |
674 | changeState(fssError, "huge req token"); | |
675 | quitAfterError(NULL); | |
3aab028c | 676 | return earlyError(EarlyErrorKind::HugeRequest); |
eacfca83 AR |
677 | } |
678 | ||
1ab04517 | 679 | // technically, we may skip multiple NLs below, but that is OK |
aea65fec | 680 | if (!parsed || !tok.skipAll(CharacterSet::LF)) { // did not find terminating LF yet |
1ab04517 | 681 | // we need more data, but can we buffer more? |
fcc444e3 | 682 | if (inBuf.length() >= Config.maxRequestHeaderSize) { |
1ab04517 | 683 | changeState(fssError, "huge req"); |
eacfca83 | 684 | quitAfterError(NULL); |
3aab028c | 685 | return earlyError(EarlyErrorKind::HugeRequest); |
1ab04517 | 686 | } else { |
eacfca83 | 687 | flags.readMore = true; |
1ab04517 | 688 | debugs(33, 5, "Waiting for more, up to " << |
fcc444e3 | 689 | (Config.maxRequestHeaderSize - inBuf.length())); |
1ab04517 AR |
690 | return NULL; |
691 | } | |
692 | } | |
92ae4c86 | 693 | |
1ab04517 AR |
694 | Must(parsed && cmd.length()); |
695 | consumeInput(tok.parsedSize()); // TODO: Would delaying optimize copying? | |
92ae4c86 | 696 | |
1ab04517 | 697 | debugs(33, 2, ">>ftp " << cmd << (params.isEmpty() ? "" : " ") << params); |
92ae4c86 | 698 | |
1ab04517 | 699 | cmd.toUpper(); // this should speed up and simplify future comparisons |
92ae4c86 | 700 | |
e7ce227f AR |
701 | // interception cases do not need USER to calculate the uri |
702 | if (!transparent()) { | |
aea65fec | 703 | if (!master->clientReadGreeting) { |
e7ce227f | 704 | // the first command must be USER |
eacfca83 | 705 | if (!pinning.pinned && cmd != cmdUser()) |
3aab028c | 706 | return earlyError(EarlyErrorKind::MissingLogin); |
92ae4c86 | 707 | } |
92ae4c86 | 708 | |
e7ce227f | 709 | // process USER request now because it sets FTP peer host name |
eacfca83 | 710 | if (cmd == cmdUser()) { |
d3dddfb5 | 711 | if (Http::Stream *errCtx = handleUserRequest(cmd, params)) |
eacfca83 AR |
712 | return errCtx; |
713 | } | |
e7ce227f | 714 | } |
92ae4c86 | 715 | |
eacfca83 | 716 | if (!Ftp::SupportedCommand(cmd)) |
3aab028c | 717 | return earlyError(EarlyErrorKind::UnsupportedCommand); |
92ae4c86 AR |
718 | |
719 | const HttpRequestMethod method = | |
1ab04517 | 720 | cmd == cmdAppe() || cmd == cmdStor() || cmd == cmdStou() ? |
92ae4c86 AR |
721 | Http::METHOD_PUT : Http::METHOD_GET; |
722 | ||
aea65fec | 723 | const SBuf *path = (params.length() && CommandHasPathParameter(cmd)) ? |
27c841f6 | 724 | ¶ms : NULL; |
1ab04517 | 725 | calcUri(path); |
ad05b958 | 726 | const auto mx = MasterXaction::MakePortful(port); |
5ceaee75 | 727 | mx->tcpClient = clientConnection; |
6c880a16 | 728 | auto * const request = HttpRequest::FromUrl(uri, mx, method); |
92ae4c86 | 729 | if (!request) { |
e7ce227f | 730 | debugs(33, 5, "Invalid FTP URL: " << uri); |
1ab04517 | 731 | uri.clear(); |
3aab028c | 732 | return earlyError(EarlyErrorKind::InvalidUri); |
92ae4c86 | 733 | } |
8babada0 | 734 | char *newUri = xstrdup(uri.c_str()); |
92ae4c86 AR |
735 | |
736 | request->flags.ftpNative = true; | |
9bafa70d | 737 | request->http_ver = Http::ProtocolVersion(Ftp::ProtocolVersion().major, Ftp::ProtocolVersion().minor); |
92ae4c86 AR |
738 | |
739 | // Our fake Request-URIs are not distinctive enough for caching to work | |
740 | request->flags.cachable = false; // XXX: reset later by maybeCacheable() | |
741 | request->flags.noCache = true; | |
742 | ||
789217a2 FC |
743 | request->header.putStr(Http::HdrType::FTP_COMMAND, cmd.c_str()); |
744 | request->header.putStr(Http::HdrType::FTP_ARGUMENTS, params.c_str()); // may be "" | |
92ae4c86 | 745 | if (method == Http::METHOD_PUT) { |
789217a2 FC |
746 | request->header.putStr(Http::HdrType::EXPECT, "100-continue"); |
747 | request->header.putStr(Http::HdrType::TRANSFER_ENCODING, "chunked"); | |
92ae4c86 AR |
748 | } |
749 | ||
750 | ClientHttpRequest *const http = new ClientHttpRequest(this); | |
1ab04517 | 751 | http->req_sz = tok.parsedSize(); |
92ae4c86 | 752 | http->uri = newUri; |
bec110e4 | 753 | http->initRequest(request); |
92ae4c86 | 754 | |
d3dddfb5 AJ |
755 | Http::Stream *const result = |
756 | new Http::Stream(clientConnection, http); | |
92ae4c86 | 757 | |
942b1c39 AJ |
758 | StoreIOBuffer tempBuffer; |
759 | tempBuffer.data = result->reqbuf; | |
760 | tempBuffer.length = HTTP_REQBUF_SZ; | |
761 | ||
92ae4c86 AR |
762 | ClientStreamData newServer = new clientReplyContext(http); |
763 | ClientStreamData newClient = result; | |
764 | clientStreamInit(&http->client_stream, clientGetMoreData, clientReplyDetach, | |
765 | clientReplyStatus, newServer, clientSocketRecipient, | |
942b1c39 | 766 | clientSocketDetach, newClient, tempBuffer); |
92ae4c86 | 767 | |
92ae4c86 | 768 | result->flags.parsed_ok = 1; |
92ae4c86 AR |
769 | return result; |
770 | } | |
771 | ||
772 | void | |
773 | Ftp::Server::handleReply(HttpReply *reply, StoreIOBuffer data) | |
774 | { | |
775 | // the caller guarantees that we are dealing with the current context only | |
d3dddfb5 | 776 | Http::StreamPointer context = pipeline.front(); |
efd5e784 | 777 | assert(context != nullptr); |
92ae4c86 | 778 | |
92ae4c86 AR |
779 | static ReplyHandler handlers[] = { |
780 | NULL, // fssBegin | |
781 | NULL, // fssConnected | |
782 | &Ftp::Server::handleFeatReply, // fssHandleFeat | |
783 | &Ftp::Server::handlePasvReply, // fssHandlePasv | |
784 | &Ftp::Server::handlePortReply, // fssHandlePort | |
785 | &Ftp::Server::handleDataReply, // fssHandleDataRequest | |
786 | &Ftp::Server::handleUploadReply, // fssHandleUploadRequest | |
787 | &Ftp::Server::handleEprtReply,// fssHandleEprt | |
788 | &Ftp::Server::handleEpsvReply,// fssHandleEpsv | |
789 | NULL, // fssHandleCwd | |
3cc0f4e7 | 790 | NULL, // fssHandlePass |
92ae4c86 AR |
791 | NULL, // fssHandleCdup |
792 | &Ftp::Server::handleErrorReply // fssError | |
793 | }; | |
0d253dfa CT |
794 | try { |
795 | const Server &server = dynamic_cast<const Ftp::Server&>(*context->getConn()); | |
796 | if (const ReplyHandler handler = handlers[server.master->serverState]) | |
797 | (this->*handler)(reply, data); | |
798 | else | |
799 | writeForwardedReply(reply); | |
800 | } catch (const std::exception &e) { | |
801 | callException(e); | |
802 | throw TexcHere(e.what()); | |
803 | } | |
92ae4c86 AR |
804 | } |
805 | ||
806 | void | |
aea65fec | 807 | Ftp::Server::handleFeatReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 808 | { |
83b053a0 | 809 | if (pipeline.front()->http->request->error) { |
92ae4c86 AR |
810 | writeCustomReply(502, "Server does not support FEAT", reply); |
811 | return; | |
812 | } | |
813 | ||
0d253dfa | 814 | Must(reply); |
f0174f5b CT |
815 | HttpReply::Pointer featReply = Ftp::HttpReplyWrapper(211, "End", Http::scNoContent, 0); |
816 | HttpHeader const &serverReplyHeader = reply->header; | |
92ae4c86 | 817 | |
92ae4c86 AR |
818 | HttpHeaderPos pos = HttpHeaderInitPos; |
819 | bool hasEPRT = false; | |
820 | bool hasEPSV = false; | |
821 | int prependSpaces = 1; | |
f0174f5b | 822 | |
789217a2 FC |
823 | featReply->header.putStr(Http::HdrType::FTP_PRE, "\"211-Features:\""); |
824 | const int scode = serverReplyHeader.getInt(Http::HdrType::FTP_STATUS); | |
f0174f5b CT |
825 | if (scode == 211) { |
826 | while (const HttpHeaderEntry *e = serverReplyHeader.getEntry(&pos)) { | |
789217a2 | 827 | if (e->id == Http::HdrType::FTP_PRE) { |
f0174f5b CT |
828 | // assume RFC 2389 FEAT response format, quoted by Squid: |
829 | // <"> SP NAME [SP PARAMS] <"> | |
830 | // but accommodate MS servers sending four SPs before NAME | |
831 | ||
832 | // command name ends with (SP parameter) or quote | |
833 | static const CharacterSet AfterFeatNameChars("AfterFeatName", " \""); | |
834 | static const CharacterSet FeatNameChars = AfterFeatNameChars.complement("FeatName"); | |
835 | ||
836 | Parser::Tokenizer tok(SBuf(e->value.termedBuf())); | |
837 | if (!tok.skip('"') || !tok.skip(' ')) | |
838 | continue; | |
839 | ||
2f8abb64 | 840 | // optional spaces; remember their number to accommodate MS servers |
f0174f5b CT |
841 | prependSpaces = 1 + tok.skipAll(CharacterSet::SP); |
842 | ||
843 | SBuf cmd; | |
844 | if (!tok.prefix(cmd, FeatNameChars)) | |
845 | continue; | |
846 | cmd.toUpper(); | |
847 | ||
848 | if (Ftp::SupportedCommand(cmd)) { | |
849 | featReply->header.addEntry(e->clone()); | |
850 | } | |
851 | ||
852 | if (cmd == cmdEprt()) | |
853 | hasEPRT = true; | |
854 | else if (cmd == cmdEpsv()) | |
855 | hasEPSV = true; | |
856 | } | |
92ae4c86 | 857 | } |
f0174f5b | 858 | } // else we got a FEAT error and will only report Squid-supported features |
92ae4c86 AR |
859 | |
860 | char buf[256]; | |
92ae4c86 AR |
861 | if (!hasEPRT) { |
862 | snprintf(buf, sizeof(buf), "\"%*s\"", prependSpaces + 4, "EPRT"); | |
789217a2 | 863 | featReply->header.putStr(Http::HdrType::FTP_PRE, buf); |
92ae4c86 AR |
864 | } |
865 | if (!hasEPSV) { | |
866 | snprintf(buf, sizeof(buf), "\"%*s\"", prependSpaces + 4, "EPSV"); | |
789217a2 | 867 | featReply->header.putStr(Http::HdrType::FTP_PRE, buf); |
92ae4c86 AR |
868 | } |
869 | ||
f0174f5b | 870 | featReply->header.refreshMask(); |
92ae4c86 | 871 | |
f0174f5b | 872 | writeForwardedReply(featReply.getRaw()); |
92ae4c86 AR |
873 | } |
874 | ||
875 | void | |
aea65fec | 876 | Ftp::Server::handlePasvReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 877 | { |
d3dddfb5 | 878 | const Http::StreamPointer context(pipeline.front()); |
efd5e784 | 879 | assert(context != nullptr); |
92ae4c86 | 880 | |
83b053a0 | 881 | if (context->http->request->error) { |
92ae4c86 AR |
882 | writeCustomReply(502, "Server does not support PASV", reply); |
883 | return; | |
884 | } | |
885 | ||
886 | const unsigned short localPort = listenForDataConnection(); | |
887 | if (!localPort) | |
888 | return; | |
889 | ||
890 | char addr[MAX_IPSTRLEN]; | |
891 | // remote server in interception setups and local address otherwise | |
892 | const Ip::Address &server = transparent() ? | |
893 | clientConnection->local : dataListenConn->local; | |
894 | server.toStr(addr, MAX_IPSTRLEN, AF_INET); | |
895 | addr[MAX_IPSTRLEN - 1] = '\0'; | |
896 | for (char *c = addr; *c != '\0'; ++c) { | |
897 | if (*c == '.') | |
898 | *c = ','; | |
899 | } | |
900 | ||
901 | // In interception setups, we combine remote server address with a | |
902 | // local port number and hope that traffic will be redirected to us. | |
903 | // Do not use "227 =a,b,c,d,p1,p2" format or omit parens: some nf_ct_ftp | |
904 | // versions block responses that use those alternative syntax rules! | |
905 | MemBuf mb; | |
906 | mb.init(); | |
4391cd15 | 907 | mb.appendf("227 Entering Passive Mode (%s,%i,%i).\r\n", |
f680026f SM |
908 | addr, |
909 | static_cast<int>(localPort / 256), | |
910 | static_cast<int>(localPort % 256)); | |
aea65fec | 911 | debugs(9, 3, Raw("writing", mb.buf, mb.size)); |
92ae4c86 AR |
912 | writeReply(mb); |
913 | } | |
914 | ||
915 | void | |
aea65fec | 916 | Ftp::Server::handlePortReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 917 | { |
83b053a0 | 918 | if (pipeline.front()->http->request->error) { |
92ae4c86 AR |
919 | writeCustomReply(502, "Server does not support PASV (converted from PORT)", reply); |
920 | return; | |
921 | } | |
922 | ||
923 | writeCustomReply(200, "PORT successfully converted to PASV."); | |
924 | ||
925 | // and wait for RETR | |
926 | } | |
927 | ||
928 | void | |
aea65fec | 929 | Ftp::Server::handleErrorReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 AR |
930 | { |
931 | if (!pinning.pinned) // we failed to connect to server | |
1ab04517 | 932 | uri.clear(); |
92ae4c86 AR |
933 | // 421: we will close due to fssError |
934 | writeErrorReply(reply, 421); | |
935 | } | |
936 | ||
937 | void | |
938 | Ftp::Server::handleDataReply(const HttpReply *reply, StoreIOBuffer data) | |
939 | { | |
940 | if (reply != NULL && reply->sline.status() != Http::scOkay) { | |
941 | writeForwardedReply(reply); | |
942 | if (Comm::IsConnOpen(dataConn)) { | |
943 | debugs(33, 3, "closing " << dataConn << " on KO reply"); | |
944 | closeDataConnection(); | |
945 | } | |
946 | return; | |
947 | } | |
948 | ||
949 | if (!dataConn) { | |
950 | // We got STREAM_COMPLETE (or error) and closed the client data conn. | |
951 | debugs(33, 3, "ignoring FTP srv data response after clt data closure"); | |
952 | return; | |
953 | } | |
954 | ||
955 | if (!checkDataConnPost()) { | |
956 | writeCustomReply(425, "Data connection is not established."); | |
957 | closeDataConnection(); | |
958 | return; | |
959 | } | |
960 | ||
e7ce227f | 961 | debugs(33, 7, data.length); |
92ae4c86 AR |
962 | |
963 | if (data.length <= 0) { | |
964 | replyDataWritingCheckpoint(); // skip the actual write call | |
965 | return; | |
966 | } | |
967 | ||
968 | MemBuf mb; | |
969 | mb.init(data.length + 1, data.length + 1); | |
970 | mb.append(data.data, data.length); | |
971 | ||
972 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
973 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteReplyData); | |
974 | Comm::Write(dataConn, &mb, call); | |
975 | ||
efd5e784 | 976 | pipeline.front()->noteSentBodyBytes(data.length); |
92ae4c86 AR |
977 | } |
978 | ||
979 | /// called when we are done writing a chunk of the response data | |
980 | void | |
981 | Ftp::Server::wroteReplyData(const CommIoCbParams &io) | |
982 | { | |
983 | if (io.flag == Comm::ERR_CLOSING) | |
984 | return; | |
985 | ||
986 | if (io.flag != Comm::OK) { | |
aea65fec | 987 | debugs(33, 3, "FTP reply data writing failed: " << xstrerr(io.xerrno)); |
92cfc72f | 988 | userDataCompletionCheckpoint(426); |
92ae4c86 AR |
989 | return; |
990 | } | |
991 | ||
efd5e784 AJ |
992 | assert(pipeline.front()->http); |
993 | pipeline.front()->http->out.size += io.size; | |
92ae4c86 AR |
994 | replyDataWritingCheckpoint(); |
995 | } | |
996 | ||
997 | /// ClientStream checks after (actual or skipped) reply data writing | |
998 | void | |
27c841f6 AR |
999 | Ftp::Server::replyDataWritingCheckpoint() |
1000 | { | |
efd5e784 | 1001 | switch (pipeline.front()->socketState()) { |
92ae4c86 AR |
1002 | case STREAM_NONE: |
1003 | debugs(33, 3, "Keep going"); | |
efd5e784 | 1004 | pipeline.front()->pullData(); |
92ae4c86 AR |
1005 | return; |
1006 | case STREAM_COMPLETE: | |
e7ce227f | 1007 | debugs(33, 3, "FTP reply data transfer successfully complete"); |
92cfc72f | 1008 | userDataCompletionCheckpoint(226); |
92ae4c86 AR |
1009 | break; |
1010 | case STREAM_UNPLANNED_COMPLETE: | |
e7ce227f | 1011 | debugs(33, 3, "FTP reply data transfer failed: STREAM_UNPLANNED_COMPLETE"); |
92cfc72f | 1012 | userDataCompletionCheckpoint(451); |
92ae4c86 AR |
1013 | break; |
1014 | case STREAM_FAILED: | |
92cfc72f | 1015 | userDataCompletionCheckpoint(451); |
e7ce227f | 1016 | debugs(33, 3, "FTP reply data transfer failed: STREAM_FAILED"); |
92ae4c86 AR |
1017 | break; |
1018 | default: | |
1019 | fatal("unreachable code"); | |
1020 | } | |
92ae4c86 AR |
1021 | } |
1022 | ||
1023 | void | |
aea65fec | 1024 | Ftp::Server::handleUploadReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 AR |
1025 | { |
1026 | writeForwardedReply(reply); | |
1027 | // note that the client data connection may already be closed by now | |
1028 | } | |
1029 | ||
1030 | void | |
1031 | Ftp::Server::writeForwardedReply(const HttpReply *reply) | |
1032 | { | |
0d253dfa CT |
1033 | Must(reply); |
1034 | ||
3238b9b6 CT |
1035 | if (waitingForOrigin) { |
1036 | Must(delayedReply == NULL); | |
1037 | delayedReply = reply; | |
1038 | return; | |
1039 | } | |
1040 | ||
92ae4c86 | 1041 | const HttpHeader &header = reply->header; |
789217a2 FC |
1042 | // adaptation and forwarding errors lack Http::HdrType::FTP_STATUS |
1043 | if (!header.has(Http::HdrType::FTP_STATUS)) { | |
92ae4c86 AR |
1044 | writeForwardedForeign(reply); // will get to Ftp::Server::wroteReply |
1045 | return; | |
1046 | } | |
1047 | ||
1048 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
1049 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteReply); | |
1050 | writeForwardedReplyAndCall(reply, call); | |
1051 | } | |
1052 | ||
1053 | void | |
aea65fec | 1054 | Ftp::Server::handleEprtReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 1055 | { |
83b053a0 | 1056 | if (pipeline.front()->http->request->error) { |
92ae4c86 AR |
1057 | writeCustomReply(502, "Server does not support PASV (converted from EPRT)", reply); |
1058 | return; | |
1059 | } | |
1060 | ||
1061 | writeCustomReply(200, "EPRT successfully converted to PASV."); | |
1062 | ||
1063 | // and wait for RETR | |
1064 | } | |
1065 | ||
1066 | void | |
aea65fec | 1067 | Ftp::Server::handleEpsvReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 1068 | { |
83b053a0 | 1069 | if (pipeline.front()->http->request->error) { |
92ae4c86 AR |
1070 | writeCustomReply(502, "Cannot connect to server", reply); |
1071 | return; | |
1072 | } | |
1073 | ||
1074 | const unsigned short localPort = listenForDataConnection(); | |
1075 | if (!localPort) | |
1076 | return; | |
1077 | ||
aea65fec AR |
1078 | // In interception setups, we use a local port number and hope that data |
1079 | // traffic will be redirected to us. | |
92ae4c86 AR |
1080 | MemBuf mb; |
1081 | mb.init(); | |
4391cd15 | 1082 | mb.appendf("229 Entering Extended Passive Mode (|||%u|)\r\n", localPort); |
92ae4c86 | 1083 | |
aea65fec | 1084 | debugs(9, 3, Raw("writing", mb.buf, mb.size)); |
92ae4c86 AR |
1085 | writeReply(mb); |
1086 | } | |
1087 | ||
1088 | /// writes FTP error response with given status and reply-derived error details | |
1089 | void | |
1090 | Ftp::Server::writeErrorReply(const HttpReply *reply, const int scode) | |
1091 | { | |
efd5e784 | 1092 | const HttpRequest *request = pipeline.front()->http->request; |
92ae4c86 AR |
1093 | assert(request); |
1094 | ||
1095 | MemBuf mb; | |
1096 | mb.init(); | |
1097 | ||
83b053a0 CT |
1098 | if (request->error) |
1099 | mb.appendf("%i-%s\r\n", scode, errorPageName(request->error.category)); | |
92ae4c86 | 1100 | |
83b053a0 CT |
1101 | if (const auto &detail = request->error.detail) { |
1102 | mb.appendf("%i-Error-Detail-Brief: " SQUIDSBUFPH "\r\n", scode, SQUIDSBUFPRINT(detail->brief())); | |
1103 | mb.appendf("%i-Error-Detail-Verbose: " SQUIDSBUFPH "\r\n", scode, SQUIDSBUFPRINT(detail->verbose(request))); | |
92ae4c86 AR |
1104 | } |
1105 | ||
02e1ed26 | 1106 | #if USE_ADAPTATION |
92ae4c86 AR |
1107 | // XXX: Remove hard coded names. Use an error page template instead. |
1108 | const Adaptation::History::Pointer ah = request->adaptHistory(); | |
1109 | if (ah != NULL) { // XXX: add adapt::<all_h but use lastMeta here | |
1110 | const String info = ah->allMeta.getByName("X-Response-Info"); | |
1111 | const String desc = ah->allMeta.getByName("X-Response-Desc"); | |
1112 | if (info.size()) | |
4391cd15 | 1113 | mb.appendf("%i-Information: %s\r\n", scode, info.termedBuf()); |
92ae4c86 | 1114 | if (desc.size()) |
4391cd15 | 1115 | mb.appendf("%i-Description: %s\r\n", scode, desc.termedBuf()); |
92ae4c86 | 1116 | } |
02e1ed26 | 1117 | #endif |
92ae4c86 | 1118 | |
9118c951 CT |
1119 | const char *reason = "Lost Error"; |
1120 | if (reply) { | |
1121 | reason = reply->header.has(Http::HdrType::FTP_REASON) ? | |
1122 | reply->header.getStr(Http::HdrType::FTP_REASON): | |
1123 | reply->sline.reason(); | |
1124 | } | |
92ae4c86 | 1125 | |
4391cd15 | 1126 | mb.appendf("%i %s\r\n", scode, reason); // error terminating line |
92ae4c86 AR |
1127 | |
1128 | // TODO: errorpage.cc should detect FTP client and use | |
1129 | // configurable FTP-friendly error templates which we should | |
1130 | // write to the client "as is" instead of hiding most of the info | |
1131 | ||
1132 | writeReply(mb); | |
1133 | } | |
1134 | ||
1135 | /// writes FTP response based on HTTP reply that is not an FTP-response wrapper | |
eacfca83 | 1136 | /// for example, internally-generated Squid "errorpages" end up here (for now) |
92ae4c86 AR |
1137 | void |
1138 | Ftp::Server::writeForwardedForeign(const HttpReply *reply) | |
1139 | { | |
1140 | changeState(fssConnected, "foreign reply"); | |
1141 | closeDataConnection(); | |
1142 | // 451: We intend to keep the control connection open. | |
1143 | writeErrorReply(reply, 451); | |
1144 | } | |
1145 | ||
2f97ab10 | 1146 | bool |
84540b47 | 1147 | Ftp::Server::writeControlMsgAndCall(HttpReply *reply, AsyncCall::Pointer &call) |
92ae4c86 AR |
1148 | { |
1149 | // the caller guarantees that we are dealing with the current context only | |
789217a2 | 1150 | // the caller should also make sure reply->header.has(Http::HdrType::FTP_STATUS) |
92ae4c86 | 1151 | writeForwardedReplyAndCall(reply, call); |
2f97ab10 | 1152 | return true; |
92ae4c86 AR |
1153 | } |
1154 | ||
1155 | void | |
1156 | Ftp::Server::writeForwardedReplyAndCall(const HttpReply *reply, AsyncCall::Pointer &call) | |
1157 | { | |
1158 | assert(reply != NULL); | |
1159 | const HttpHeader &header = reply->header; | |
1160 | ||
1161 | // without status, the caller must use the writeForwardedForeign() path | |
789217a2 FC |
1162 | Must(header.has(Http::HdrType::FTP_STATUS)); |
1163 | Must(header.has(Http::HdrType::FTP_REASON)); | |
1164 | const int scode = header.getInt(Http::HdrType::FTP_STATUS); | |
e7ce227f | 1165 | debugs(33, 7, "scode: " << scode); |
92ae4c86 AR |
1166 | |
1167 | // Status 125 or 150 implies upload or data request, but we still check | |
1168 | // the state in case the server is buggy. | |
1169 | if ((scode == 125 || scode == 150) && | |
aea65fec AR |
1170 | (master->serverState == fssHandleUploadRequest || |
1171 | master->serverState == fssHandleDataRequest)) { | |
92ae4c86 AR |
1172 | if (checkDataConnPost()) { |
1173 | // If the data connection is ready, start reading data (here) | |
1174 | // and forward the response to client (further below). | |
1175 | debugs(33, 7, "data connection established, start data transfer"); | |
aea65fec | 1176 | if (master->serverState == fssHandleUploadRequest) |
92ae4c86 AR |
1177 | maybeReadUploadData(); |
1178 | } else { | |
1179 | // If we are waiting to accept the data connection, keep waiting. | |
1180 | if (Comm::IsConnOpen(dataListenConn)) { | |
1181 | debugs(33, 7, "wait for the client to establish a data connection"); | |
1182 | onDataAcceptCall = call; | |
1183 | // TODO: Add connect timeout for passive connections listener? | |
1184 | // TODO: Remember server response so that we can forward it? | |
1185 | } else { | |
1186 | // Either the connection was establised and closed after the | |
1187 | // data was transferred OR we failed to establish an active | |
1188 | // data connection and already sent the error to the client. | |
1189 | // In either case, there is nothing more to do. | |
1190 | debugs(33, 7, "done with data OR active connection failed"); | |
1191 | } | |
1192 | return; | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | MemBuf mb; | |
1197 | mb.init(); | |
1198 | Ftp::PrintReply(mb, reply); | |
1199 | ||
aea65fec AR |
1200 | debugs(9, 2, "FTP Client " << clientConnection); |
1201 | debugs(9, 2, "FTP Client REPLY:\n---------\n" << mb.buf << | |
92ae4c86 AR |
1202 | "\n----------"); |
1203 | ||
1204 | Comm::Write(clientConnection, &mb, call); | |
1205 | } | |
1206 | ||
1207 | static void | |
ced8def3 | 1208 | Ftp::PrintReply(MemBuf &mb, const HttpReply *reply, const char *const) |
92ae4c86 AR |
1209 | { |
1210 | const HttpHeader &header = reply->header; | |
1211 | ||
1212 | HttpHeaderPos pos = HttpHeaderInitPos; | |
1213 | while (const HttpHeaderEntry *e = header.getEntry(&pos)) { | |
789217a2 | 1214 | if (e->id == Http::HdrType::FTP_PRE) { |
92ae4c86 AR |
1215 | String raw; |
1216 | if (httpHeaderParseQuotedString(e->value.rawBuf(), e->value.size(), &raw)) | |
4391cd15 | 1217 | mb.appendf("%s\r\n", raw.termedBuf()); |
92ae4c86 AR |
1218 | } |
1219 | } | |
1220 | ||
789217a2 FC |
1221 | if (header.has(Http::HdrType::FTP_STATUS)) { |
1222 | const char *reason = header.getStr(Http::HdrType::FTP_REASON); | |
1223 | mb.appendf("%i %s\r\n", header.getInt(Http::HdrType::FTP_STATUS), | |
f680026f | 1224 | (reason ? reason : 0)); |
92ae4c86 AR |
1225 | } |
1226 | } | |
1227 | ||
1228 | void | |
1229 | Ftp::Server::wroteEarlyReply(const CommIoCbParams &io) | |
1230 | { | |
1231 | if (io.flag == Comm::ERR_CLOSING) | |
1232 | return; | |
1233 | ||
1234 | if (io.flag != Comm::OK) { | |
1235 | debugs(33, 3, "FTP reply writing failed: " << xstrerr(io.xerrno)); | |
1236 | io.conn->close(); | |
1237 | return; | |
1238 | } | |
1239 | ||
d3dddfb5 | 1240 | Http::StreamPointer context = pipeline.front(); |
efd5e784 | 1241 | if (context != nullptr && context->http) { |
92ae4c86 AR |
1242 | context->http->out.size += io.size; |
1243 | context->http->out.headers_sz += io.size; | |
1244 | } | |
1245 | ||
1246 | flags.readMore = true; | |
1247 | readSomeData(); | |
1248 | } | |
1249 | ||
1250 | void | |
1251 | Ftp::Server::wroteReply(const CommIoCbParams &io) | |
1252 | { | |
1253 | if (io.flag == Comm::ERR_CLOSING) | |
1254 | return; | |
1255 | ||
1256 | if (io.flag != Comm::OK) { | |
1257 | debugs(33, 3, "FTP reply writing failed: " << xstrerr(io.xerrno)); | |
1258 | io.conn->close(); | |
1259 | return; | |
1260 | } | |
1261 | ||
d3dddfb5 | 1262 | Http::StreamPointer context = pipeline.front(); |
92ae4c86 AR |
1263 | assert(context->http); |
1264 | context->http->out.size += io.size; | |
1265 | context->http->out.headers_sz += io.size; | |
1266 | ||
aea65fec | 1267 | if (master->serverState == fssError) { |
92ae4c86 AR |
1268 | debugs(33, 5, "closing on FTP server error"); |
1269 | io.conn->close(); | |
1270 | return; | |
1271 | } | |
1272 | ||
1273 | const clientStream_status_t socketState = context->socketState(); | |
1274 | debugs(33, 5, "FTP client stream state " << socketState); | |
1275 | switch (socketState) { | |
1276 | case STREAM_UNPLANNED_COMPLETE: | |
1277 | case STREAM_FAILED: | |
27c841f6 AR |
1278 | io.conn->close(); |
1279 | return; | |
92ae4c86 AR |
1280 | |
1281 | case STREAM_NONE: | |
1282 | case STREAM_COMPLETE: | |
1283 | flags.readMore = true; | |
1284 | changeState(fssConnected, "Ftp::Server::wroteReply"); | |
fcc444e3 | 1285 | if (bodyParser) |
92ae4c86 | 1286 | finishDechunkingRequest(false); |
d20f59e2 | 1287 | context->finished(); |
cb7fa5cf | 1288 | kick(); |
92ae4c86 AR |
1289 | return; |
1290 | } | |
1291 | } | |
1292 | ||
1293 | bool | |
eacfca83 | 1294 | Ftp::Server::handleRequest(HttpRequest *request) |
27c841f6 | 1295 | { |
eacfca83 | 1296 | debugs(33, 9, request); |
92ae4c86 AR |
1297 | Must(request); |
1298 | ||
eacfca83 | 1299 | HttpHeader &header = request->header; |
789217a2 FC |
1300 | Must(header.has(Http::HdrType::FTP_COMMAND)); |
1301 | String &cmd = header.findEntry(Http::HdrType::FTP_COMMAND)->value; | |
1302 | Must(header.has(Http::HdrType::FTP_ARGUMENTS)); | |
1303 | String ¶ms = header.findEntry(Http::HdrType::FTP_ARGUMENTS)->value; | |
eacfca83 | 1304 | |
014adac1 | 1305 | if (Debug::Enabled(9, 2)) { |
92ae4c86 | 1306 | MemBuf mb; |
92ae4c86 | 1307 | mb.init(); |
10201568 | 1308 | request->pack(&mb); |
92ae4c86 | 1309 | |
aea65fec AR |
1310 | debugs(9, 2, "FTP Client " << clientConnection); |
1311 | debugs(9, 2, "FTP Client REQUEST:\n---------\n" << mb.buf << | |
92ae4c86 AR |
1312 | "\n----------"); |
1313 | } | |
1314 | ||
1ab04517 AR |
1315 | // TODO: When HttpHeader uses SBuf, change keys to SBuf |
1316 | typedef std::map<const std::string, RequestHandler> RequestHandlers; | |
1317 | static RequestHandlers handlers; | |
1318 | if (!handlers.size()) { | |
1319 | handlers["LIST"] = &Ftp::Server::handleDataRequest; | |
1320 | handlers["NLST"] = &Ftp::Server::handleDataRequest; | |
1321 | handlers["MLSD"] = &Ftp::Server::handleDataRequest; | |
1322 | handlers["FEAT"] = &Ftp::Server::handleFeatRequest; | |
1323 | handlers["PASV"] = &Ftp::Server::handlePasvRequest; | |
1324 | handlers["PORT"] = &Ftp::Server::handlePortRequest; | |
1325 | handlers["RETR"] = &Ftp::Server::handleDataRequest; | |
1326 | handlers["EPRT"] = &Ftp::Server::handleEprtRequest; | |
1327 | handlers["EPSV"] = &Ftp::Server::handleEpsvRequest; | |
1328 | handlers["CWD"] = &Ftp::Server::handleCwdRequest; | |
1329 | handlers["PASS"] = &Ftp::Server::handlePassRequest; | |
1330 | handlers["CDUP"] = &Ftp::Server::handleCdupRequest; | |
1331 | } | |
92ae4c86 AR |
1332 | |
1333 | RequestHandler handler = NULL; | |
1334 | if (request->method == Http::METHOD_PUT) | |
1335 | handler = &Ftp::Server::handleUploadRequest; | |
1336 | else { | |
1ab04517 AR |
1337 | const RequestHandlers::const_iterator hi = handlers.find(cmd.termedBuf()); |
1338 | if (hi != handlers.end()) | |
1339 | handler = hi->second; | |
92ae4c86 AR |
1340 | } |
1341 | ||
1ab04517 | 1342 | if (!handler) { |
aea65fec | 1343 | debugs(9, 7, "forwarding " << cmd << " as is, no post-processing"); |
1ab04517 AR |
1344 | return true; |
1345 | } | |
1346 | ||
1347 | return (this->*handler)(cmd, params); | |
92ae4c86 AR |
1348 | } |
1349 | ||
1350 | /// Called to parse USER command, which is required to create an HTTP request | |
eacfca83 | 1351 | /// wrapper. W/o request, the errors are handled by returning earlyError(). |
d3dddfb5 | 1352 | Http::Stream * |
ced8def3 | 1353 | Ftp::Server::handleUserRequest(const SBuf &, SBuf ¶ms) |
92ae4c86 | 1354 | { |
eacfca83 | 1355 | if (params.isEmpty()) |
3aab028c | 1356 | return earlyError(EarlyErrorKind::MissingUsername); |
92ae4c86 | 1357 | |
e7ce227f | 1358 | // find the [end of] user name |
1ab04517 | 1359 | const SBuf::size_type eou = params.rfind('@'); |
eacfca83 | 1360 | if (eou == SBuf::npos || eou + 1 >= params.length()) |
3aab028c | 1361 | return earlyError(EarlyErrorKind::MissingHost); |
92ae4c86 | 1362 | |
e7ce227f | 1363 | // Determine the intended destination. |
1ab04517 | 1364 | host = params.substr(eou + 1, params.length()); |
92ae4c86 AR |
1365 | // If we can parse it as raw IPv6 address, then surround with "[]". |
1366 | // Otherwise (domain, IPv4, [bracketed] IPv6, garbage, etc), use as is. | |
1ab04517 AR |
1367 | if (host.find(':') != SBuf::npos) { |
1368 | const Ip::Address ipa(host.c_str()); | |
92ae4c86 | 1369 | if (!ipa.isAnyAddr()) { |
1ab04517 | 1370 | char ipBuf[MAX_IPSTRLEN]; |
92ae4c86 AR |
1371 | ipa.toHostStr(ipBuf, MAX_IPSTRLEN); |
1372 | host = ipBuf; | |
1373 | } | |
1374 | } | |
1375 | ||
1ab04517 AR |
1376 | // const SBuf login = params.substr(0, eou); |
1377 | params.chop(0, eou); // leave just the login part for the peer | |
1378 | ||
1379 | SBuf oldUri; | |
aea65fec | 1380 | if (master->clientReadGreeting) |
92ae4c86 AR |
1381 | oldUri = uri; |
1382 | ||
aea65fec | 1383 | master->workingDir.clear(); |
1ab04517 | 1384 | calcUri(NULL); |
92ae4c86 | 1385 | |
aea65fec AR |
1386 | if (!master->clientReadGreeting) { |
1387 | debugs(9, 3, "set URI to " << uri); | |
92ae4c86 | 1388 | } else if (oldUri.caseCmp(uri) == 0) { |
aea65fec | 1389 | debugs(9, 5, "kept URI as " << oldUri); |
92ae4c86 | 1390 | } else { |
aea65fec | 1391 | debugs(9, 3, "reset URI from " << oldUri << " to " << uri); |
92ae4c86 | 1392 | closeDataConnection(); |
92ae4c86 | 1393 | unpinConnection(true); // close control connection to peer |
e7ce227f | 1394 | resetLogin("URI reset"); |
92ae4c86 AR |
1395 | } |
1396 | ||
eacfca83 | 1397 | return NULL; // no early errors |
92ae4c86 AR |
1398 | } |
1399 | ||
1400 | bool | |
ced8def3 | 1401 | Ftp::Server::handleFeatRequest(String &, String &) |
92ae4c86 | 1402 | { |
e7ce227f | 1403 | changeState(fssHandleFeat, "handleFeatRequest"); |
92ae4c86 AR |
1404 | return true; |
1405 | } | |
1406 | ||
1407 | bool | |
ced8def3 | 1408 | Ftp::Server::handlePasvRequest(String &, String ¶ms) |
92ae4c86 AR |
1409 | { |
1410 | if (gotEpsvAll) { | |
1411 | setReply(500, "Bad PASV command"); | |
1412 | return false; | |
1413 | } | |
1414 | ||
1415 | if (params.size() > 0) { | |
1416 | setReply(501, "Unexpected parameter"); | |
1417 | return false; | |
1418 | } | |
1419 | ||
e7ce227f | 1420 | changeState(fssHandlePasv, "handlePasvRequest"); |
92ae4c86 AR |
1421 | // no need to fake PASV request via setDataCommand() in true PASV case |
1422 | return true; | |
1423 | } | |
1424 | ||
1425 | /// [Re]initializes dataConn for active data transfers. Does not connect. | |
1426 | bool | |
1427 | Ftp::Server::createDataConnection(Ip::Address cltAddr) | |
1428 | { | |
1429 | assert(clientConnection != NULL); | |
1430 | assert(!clientConnection->remote.isAnyAddr()); | |
1431 | ||
1432 | if (cltAddr != clientConnection->remote) { | |
1433 | debugs(33, 2, "rogue PORT " << cltAddr << " request? ctrl: " << clientConnection->remote); | |
1434 | // Closing the control connection would not help with attacks because | |
1435 | // the client is evidently able to connect to us. Besides, closing | |
1436 | // makes retrials easier for the client and more damaging to us. | |
1437 | setReply(501, "Prohibited parameter value"); | |
1438 | return false; | |
1439 | } | |
1440 | ||
1441 | closeDataConnection(); | |
1442 | ||
1443 | Comm::ConnectionPointer conn = new Comm::Connection(); | |
aea65fec | 1444 | conn->flags |= COMM_DOBIND; |
92ae4c86 | 1445 | |
f0c30889 AG |
1446 | if (clientConnection->flags & COMM_INTERCEPTION) { |
1447 | // In the case of NAT interception conn->local value is not set | |
1448 | // because the TCP stack will automatically pick correct source | |
1449 | // address for the data connection. We must only ensure that IP | |
1450 | // version matches client's address. | |
1451 | conn->local.setAnyAddr(); | |
1452 | ||
1453 | if (cltAddr.isIPv4()) | |
1454 | conn->local.setIPv4(); | |
1455 | ||
1456 | conn->remote = cltAddr; | |
1457 | } else { | |
1458 | // In the case of explicit-proxy the local IP of the control connection | |
1459 | // is the Squid IP the client is knowingly talking to. | |
1460 | // | |
1461 | // In the case of TPROXY the IP address of the control connection is | |
1462 | // server IP the client is connecting to, it can be spoofed by Squid. | |
1463 | // | |
1464 | // In both cases some clients may refuse to accept data connections if | |
1465 | // these control connectin local-IP's are not used. | |
1466 | conn->setAddrs(clientConnection->local, cltAddr); | |
1467 | ||
1468 | // Using non-local addresses in TPROXY mode requires appropriate socket option. | |
1469 | if (clientConnection->flags & COMM_TRANSPARENT) | |
17b07509 | 1470 | conn->flags |= COMM_TRANSPARENT; |
f0c30889 AG |
1471 | } |
1472 | ||
92ae4c86 AR |
1473 | // RFC 959 requires active FTP connections to originate from port 20 |
1474 | // but that would preclude us from supporting concurrent transfers! (XXX?) | |
1475 | conn->local.port(0); | |
1476 | ||
aea65fec | 1477 | debugs(9, 3, "will actively connect from " << conn->local << " to " << |
92ae4c86 AR |
1478 | conn->remote); |
1479 | ||
1480 | dataConn = conn; | |
1481 | uploadAvailSize = 0; | |
1482 | return true; | |
1483 | } | |
1484 | ||
1485 | bool | |
ced8def3 | 1486 | Ftp::Server::handlePortRequest(String &, String ¶ms) |
92ae4c86 AR |
1487 | { |
1488 | // TODO: Should PORT errors trigger closeDataConnection() cleanup? | |
1489 | ||
1490 | if (gotEpsvAll) { | |
1491 | setReply(500, "Rejecting PORT after EPSV ALL"); | |
1492 | return false; | |
1493 | } | |
1494 | ||
1495 | if (!params.size()) { | |
1496 | setReply(501, "Missing parameter"); | |
1497 | return false; | |
1498 | } | |
1499 | ||
1500 | Ip::Address cltAddr; | |
1501 | if (!Ftp::ParseIpPort(params.termedBuf(), NULL, cltAddr)) { | |
1502 | setReply(501, "Invalid parameter"); | |
1503 | return false; | |
1504 | } | |
1505 | ||
1506 | if (!createDataConnection(cltAddr)) | |
1507 | return false; | |
1508 | ||
e7ce227f | 1509 | changeState(fssHandlePort, "handlePortRequest"); |
92ae4c86 AR |
1510 | setDataCommand(); |
1511 | return true; // forward our fake PASV request | |
1512 | } | |
1513 | ||
1514 | bool | |
ced8def3 | 1515 | Ftp::Server::handleDataRequest(String &, String &) |
92ae4c86 AR |
1516 | { |
1517 | if (!checkDataConnPre()) | |
1518 | return false; | |
1519 | ||
92cfc72f | 1520 | master->userDataDone = 0; |
3238b9b6 | 1521 | originDataDownloadAbortedOnError = false; |
92cfc72f | 1522 | |
e7ce227f | 1523 | changeState(fssHandleDataRequest, "handleDataRequest"); |
92ae4c86 AR |
1524 | |
1525 | return true; | |
1526 | } | |
1527 | ||
1528 | bool | |
ced8def3 | 1529 | Ftp::Server::handleUploadRequest(String &, String &) |
92ae4c86 AR |
1530 | { |
1531 | if (!checkDataConnPre()) | |
1532 | return false; | |
1533 | ||
ec69bdb2 | 1534 | if (Config.accessList.forceRequestBodyContinuation) { |
efd5e784 | 1535 | ClientHttpRequest *http = pipeline.front()->http; |
ec69bdb2 CT |
1536 | HttpRequest *request = http->request; |
1537 | ACLFilledChecklist bodyContinuationCheck(Config.accessList.forceRequestBodyContinuation, request, NULL); | |
5810a994 EB |
1538 | bodyContinuationCheck.al = http->al; |
1539 | bodyContinuationCheck.syncAle(request, http->log_uri); | |
06bf5384 | 1540 | if (bodyContinuationCheck.fastCheck().allowed()) { |
ec69bdb2 CT |
1541 | request->forcedBodyContinuation = true; |
1542 | if (checkDataConnPost()) { | |
1543 | // Write control Msg | |
1544 | writeEarlyReply(150, "Data connection opened"); | |
1545 | maybeReadUploadData(); | |
1546 | } else { | |
1547 | // wait for acceptDataConnection but tell it to call wroteEarlyReply | |
1548 | // after writing "150 Data connection opened" | |
1549 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
1550 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteEarlyReply); | |
1551 | onDataAcceptCall = call; | |
1552 | } | |
1553 | } | |
1554 | } | |
1555 | ||
e7ce227f | 1556 | changeState(fssHandleUploadRequest, "handleDataRequest"); |
92ae4c86 AR |
1557 | |
1558 | return true; | |
1559 | } | |
1560 | ||
1561 | bool | |
ced8def3 | 1562 | Ftp::Server::handleEprtRequest(String &, String ¶ms) |
92ae4c86 | 1563 | { |
aea65fec | 1564 | debugs(9, 3, "Process an EPRT " << params); |
92ae4c86 AR |
1565 | |
1566 | if (gotEpsvAll) { | |
1567 | setReply(500, "Rejecting EPRT after EPSV ALL"); | |
1568 | return false; | |
1569 | } | |
1570 | ||
1571 | if (!params.size()) { | |
1572 | setReply(501, "Missing parameter"); | |
1573 | return false; | |
1574 | } | |
1575 | ||
1576 | Ip::Address cltAddr; | |
1577 | if (!Ftp::ParseProtoIpPort(params.termedBuf(), cltAddr)) { | |
1578 | setReply(501, "Invalid parameter"); | |
1579 | return false; | |
1580 | } | |
1581 | ||
1582 | if (!createDataConnection(cltAddr)) | |
1583 | return false; | |
1584 | ||
e7ce227f | 1585 | changeState(fssHandleEprt, "handleEprtRequest"); |
92ae4c86 AR |
1586 | setDataCommand(); |
1587 | return true; // forward our fake PASV request | |
1588 | } | |
1589 | ||
1590 | bool | |
ced8def3 | 1591 | Ftp::Server::handleEpsvRequest(String &, String ¶ms) |
92ae4c86 | 1592 | { |
aea65fec | 1593 | debugs(9, 3, "Process an EPSV command with params: " << params); |
92ae4c86 AR |
1594 | if (params.size() <= 0) { |
1595 | // treat parameterless EPSV as "use the protocol of the ctrl conn" | |
1596 | } else if (params.caseCmp("ALL") == 0) { | |
1597 | setReply(200, "EPSV ALL ok"); | |
1598 | gotEpsvAll = true; | |
1599 | return false; | |
1600 | } else if (params.cmp("2") == 0) { | |
1601 | if (!Ip::EnableIpv6) { | |
1602 | setReply(522, "Network protocol not supported, use (1)"); | |
1603 | return false; | |
1604 | } | |
1605 | } else if (params.cmp("1") != 0) { | |
1606 | setReply(501, "Unsupported EPSV parameter"); | |
1607 | return false; | |
1608 | } | |
1609 | ||
e7ce227f | 1610 | changeState(fssHandleEpsv, "handleEpsvRequest"); |
92ae4c86 AR |
1611 | setDataCommand(); |
1612 | return true; // forward our fake PASV request | |
1613 | } | |
1614 | ||
1615 | bool | |
ced8def3 | 1616 | Ftp::Server::handleCwdRequest(String &, String &) |
92ae4c86 | 1617 | { |
e7ce227f | 1618 | changeState(fssHandleCwd, "handleCwdRequest"); |
92ae4c86 AR |
1619 | return true; |
1620 | } | |
1621 | ||
1622 | bool | |
ced8def3 | 1623 | Ftp::Server::handlePassRequest(String &, String &) |
92ae4c86 | 1624 | { |
e7ce227f | 1625 | changeState(fssHandlePass, "handlePassRequest"); |
92ae4c86 AR |
1626 | return true; |
1627 | } | |
1628 | ||
1629 | bool | |
ced8def3 | 1630 | Ftp::Server::handleCdupRequest(String &, String &) |
92ae4c86 | 1631 | { |
e7ce227f | 1632 | changeState(fssHandleCdup, "handleCdupRequest"); |
92ae4c86 AR |
1633 | return true; |
1634 | } | |
1635 | ||
1636 | // Convert user PORT, EPRT, PASV, or EPSV data command to Squid PASV command. | |
1637 | // Squid FTP client decides what data command to use with peers. | |
1638 | void | |
1639 | Ftp::Server::setDataCommand() | |
1640 | { | |
efd5e784 | 1641 | ClientHttpRequest *const http = pipeline.front()->http; |
92ae4c86 AR |
1642 | assert(http != NULL); |
1643 | HttpRequest *const request = http->request; | |
1644 | assert(request != NULL); | |
1645 | HttpHeader &header = request->header; | |
789217a2 FC |
1646 | header.delById(Http::HdrType::FTP_COMMAND); |
1647 | header.putStr(Http::HdrType::FTP_COMMAND, "PASV"); | |
1648 | header.delById(Http::HdrType::FTP_ARGUMENTS); | |
1649 | header.putStr(Http::HdrType::FTP_ARGUMENTS, ""); | |
aea65fec | 1650 | debugs(9, 5, "client data command converted to fake PASV"); |
92ae4c86 AR |
1651 | } |
1652 | ||
1653 | /// check that client data connection is ready for future I/O or at least | |
1654 | /// has a chance of becoming ready soon. | |
1655 | bool | |
1656 | Ftp::Server::checkDataConnPre() | |
1657 | { | |
1658 | if (Comm::IsConnOpen(dataConn)) | |
1659 | return true; | |
1660 | ||
1661 | if (Comm::IsConnOpen(dataListenConn)) { | |
1662 | // We are still waiting for a client to connect to us after PASV. | |
1663 | // Perhaps client's data conn handshake has not reached us yet. | |
1664 | // After we talk to the server, checkDataConnPost() will recheck. | |
1665 | debugs(33, 3, "expecting clt data conn " << dataListenConn); | |
1666 | return true; | |
1667 | } | |
1668 | ||
1669 | if (!dataConn || dataConn->remote.isAnyAddr()) { | |
1670 | debugs(33, 5, "missing " << dataConn); | |
1671 | // TODO: use client address and default port instead. | |
1672 | setReply(425, "Use PORT or PASV first"); | |
1673 | return false; | |
1674 | } | |
1675 | ||
1676 | // active transfer: open a data connection from Squid to client | |
1677 | typedef CommCbMemFunT<Server, CommConnectCbParams> Dialer; | |
2b6b1bcb AR |
1678 | AsyncCall::Pointer callback = JobCallback(17, 3, Dialer, this, Ftp::Server::connectedForData); |
1679 | const auto cs = new Comm::ConnOpener(dataConn->cloneProfile(), callback, | |
1680 | Config.Timeout.connect); | |
1681 | dataConnWait.start(cs, callback); | |
1682 | return false; | |
92ae4c86 AR |
1683 | } |
1684 | ||
1685 | /// Check that client data connection is ready for immediate I/O. | |
1686 | bool | |
1687 | Ftp::Server::checkDataConnPost() const | |
1688 | { | |
1689 | if (!Comm::IsConnOpen(dataConn)) { | |
1690 | debugs(33, 3, "missing client data conn: " << dataConn); | |
1691 | return false; | |
1692 | } | |
1693 | return true; | |
1694 | } | |
1695 | ||
1696 | /// Done establishing a data connection to the user. | |
1697 | void | |
1698 | Ftp::Server::connectedForData(const CommConnectCbParams ¶ms) | |
1699 | { | |
2b6b1bcb | 1700 | dataConnWait.finish(); |
92ae4c86 AR |
1701 | |
1702 | if (params.flag != Comm::OK) { | |
92ae4c86 | 1703 | setReply(425, "Cannot open data connection."); |
d3dddfb5 | 1704 | Http::StreamPointer context = pipeline.front(); |
92ae4c86 AR |
1705 | Must(context->http); |
1706 | Must(context->http->storeEntry() != NULL); | |
2b6b1bcb | 1707 | // TODO: call closeDataConnection() to reset data conn processing? |
92ae4c86 | 1708 | } else { |
2b6b1bcb AR |
1709 | // Finalize the details and start owning the supplied connection. |
1710 | assert(params.conn); | |
1711 | assert(dataConn); | |
1712 | assert(!dataConn->isOpen()); | |
1713 | dataConn = params.conn; | |
1714 | // XXX: Missing comm_add_close_handler() to track external closures. | |
1715 | ||
92ae4c86 AR |
1716 | Must(Comm::IsConnOpen(params.conn)); |
1717 | fd_note(params.conn->fd, "active client ftp data"); | |
1718 | } | |
1719 | ||
1720 | doProcessRequest(); | |
1721 | } | |
1722 | ||
1723 | void | |
1724 | Ftp::Server::setReply(const int code, const char *msg) | |
1725 | { | |
d3dddfb5 | 1726 | Http::StreamPointer context = pipeline.front(); |
92ae4c86 AR |
1727 | ClientHttpRequest *const http = context->http; |
1728 | assert(http != NULL); | |
1729 | assert(http->storeEntry() == NULL); | |
1730 | ||
43446566 | 1731 | HttpReply *const reply = Ftp::HttpReplyWrapper(code, msg, Http::scNoContent, 0); |
92ae4c86 | 1732 | |
92ae4c86 AR |
1733 | clientStreamNode *const node = context->getClientReplyContext(); |
1734 | clientReplyContext *const repContext = | |
1735 | dynamic_cast<clientReplyContext *>(node->data.getRaw()); | |
1736 | assert(repContext != NULL); | |
1737 | ||
1738 | RequestFlags reqFlags; | |
1739 | reqFlags.cachable = false; // force releaseRequest() in storeCreateEntry() | |
1740 | reqFlags.noCache = true; | |
1741 | repContext->createStoreEntry(http->request->method, reqFlags); | |
1742 | http->storeEntry()->replaceHttpReply(reply); | |
1743 | } | |
1744 | ||
0d253dfa CT |
1745 | void |
1746 | Ftp::Server::callException(const std::exception &e) | |
1747 | { | |
1748 | debugs(33, 2, "FTP::Server job caught: " << e.what()); | |
1749 | closeDataConnection(); | |
1750 | unpinConnection(true); | |
1751 | if (Comm::IsConnOpen(clientConnection)) | |
1752 | clientConnection->close(); | |
1753 | AsyncJob::callException(e); | |
1754 | } | |
1755 | ||
92cfc72f | 1756 | void |
3238b9b6 | 1757 | Ftp::Server::startWaitingForOrigin() |
92cfc72f | 1758 | { |
1562cfc0 | 1759 | if (!isOpen()) // if we are closing, nothing to do |
4309d507 CT |
1760 | return; |
1761 | ||
3238b9b6 CT |
1762 | debugs(33, 5, "waiting for Ftp::Client data transfer to end"); |
1763 | waitingForOrigin = true; | |
1764 | } | |
1765 | ||
1766 | void | |
1767 | Ftp::Server::stopWaitingForOrigin(int originStatus) | |
1768 | { | |
1769 | Must(waitingForOrigin); | |
1770 | waitingForOrigin = false; | |
1771 | ||
4309d507 CT |
1772 | if (!isOpen()) // if we are closing, nothing to do |
1773 | return; | |
1774 | ||
3238b9b6 CT |
1775 | // if we have already decided how to respond, respond now |
1776 | if (delayedReply) { | |
1777 | HttpReply::Pointer reply = delayedReply; | |
1778 | delayedReply = nullptr; | |
1779 | writeForwardedReply(reply.getRaw()); | |
1780 | return; // do not completeDataDownload() after an earlier response | |
92cfc72f CT |
1781 | } |
1782 | ||
3238b9b6 CT |
1783 | if (master->serverState != fssHandleDataRequest) |
1784 | return; | |
1785 | ||
1786 | // completeDataDownload() could be waitingForOrigin in fssHandleDataRequest | |
a8d1312d | 1787 | // Depending on which side has finished downloading first, either trust |
3238b9b6 CT |
1788 | // master->userDataDone status or set originDataDownloadAbortedOnError: |
1789 | if (master->userDataDone) { | |
1790 | // We finished downloading before Ftp::Client. Most likely, the | |
1791 | // adaptation shortened the origin response or we hit an error. | |
1792 | // Our status (stored in master->userDataDone) is more informative. | |
1793 | // Use master->userDataDone; avoid originDataDownloadAbortedOnError. | |
1794 | completeDataDownload(); | |
1795 | } else { | |
1796 | debugs(33, 5, "too early to write the response"); | |
1797 | // Ftp::Client naturally finished downloading before us. Set | |
1798 | // originDataDownloadAbortedOnError to overwrite future | |
1799 | // master->userDataDone and relay Ftp::Client error, if there was | |
1800 | // any, to the user. | |
1801 | originDataDownloadAbortedOnError = (originStatus >= 400); | |
1802 | } | |
92cfc72f CT |
1803 | } |
1804 | ||
1805 | void Ftp::Server::userDataCompletionCheckpoint(int finalStatusCode) | |
1806 | { | |
1807 | Must(!master->userDataDone); | |
1808 | master->userDataDone = finalStatusCode; | |
1809 | ||
1810 | if (bodyParser) | |
1811 | finishDechunkingRequest(false); | |
1812 | ||
3238b9b6 CT |
1813 | if (waitingForOrigin) { |
1814 | // The completeDataDownload() is not called here unconditionally | |
92cfc72f CT |
1815 | // because we want to signal the FTP user that we are not fully |
1816 | // done processing its data stream, even though all data bytes | |
1817 | // have been sent or received already. | |
61beade2 | 1818 | debugs(33, 5, "Transferring from FTP server is not complete"); |
92cfc72f CT |
1819 | return; |
1820 | } | |
1821 | ||
3238b9b6 CT |
1822 | // Adjust our reply if the server aborted with an error before we are done. |
1823 | if (master->userDataDone == 226 && originDataDownloadAbortedOnError) { | |
61beade2 | 1824 | debugs(33, 5, "Transferring from FTP server terminated with an error, adjust status code"); |
3238b9b6 CT |
1825 | master->userDataDone = 451; |
1826 | } | |
1827 | completeDataDownload(); | |
92cfc72f CT |
1828 | } |
1829 | ||
3238b9b6 | 1830 | void Ftp::Server::completeDataDownload() |
92cfc72f CT |
1831 | { |
1832 | writeCustomReply(master->userDataDone, master->userDataDone == 226 ? "Transfer complete" : "Server error; transfer aborted"); | |
1833 | closeDataConnection(); | |
1834 | } | |
1835 | ||
43446566 | 1836 | /// Whether Squid FTP Relay supports a named feature (e.g., a command). |
92ae4c86 | 1837 | static bool |
1ab04517 | 1838 | Ftp::SupportedCommand(const SBuf &name) |
92ae4c86 | 1839 | { |
70d0ef18 | 1840 | static std::set<SBuf> BlockList; |
1841 | if (BlockList.empty()) { | |
43446566 | 1842 | /* Add FTP commands that Squid cannot relay correctly. */ |
92ae4c86 | 1843 | |
43446566 AR |
1844 | // We probably do not support AUTH TLS.* and AUTH SSL, |
1845 | // but let's disclaim all AUTH support to KISS, for now. | |
70d0ef18 | 1846 | BlockList.insert(cmdAuth()); |
92ae4c86 AR |
1847 | } |
1848 | ||
1849 | // we claim support for all commands that we do not know about | |
70d0ef18 | 1850 | return BlockList.find(name) == BlockList.end(); |
92ae4c86 AR |
1851 | } |
1852 |