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92ae4c86 | 1 | /* |
ef57eb7b | 2 | * Copyright (C) 1996-2016 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" |
aea65fec | 14 | #include "base/RefCount.h" |
92ae4c86 | 15 | #include "base/Subscription.h" |
27c841f6 AR |
16 | #include "client_side_reply.h" |
17 | #include "client_side_request.h" | |
92ae4c86 AR |
18 | #include "clientStream.h" |
19 | #include "comm/ConnOpener.h" | |
20 | #include "comm/Read.h" | |
21 | #include "comm/TcpAcceptor.h" | |
22 | #include "comm/Write.h" | |
92ae4c86 AR |
23 | #include "errorpage.h" |
24 | #include "fd.h" | |
1ab04517 | 25 | #include "ftp/Elements.h" |
92ae4c86 AR |
26 | #include "ftp/Parsing.h" |
27 | #include "globals.h" | |
9bafa70d | 28 | #include "http/one/RequestParser.h" |
d3dddfb5 | 29 | #include "http/Stream.h" |
92ae4c86 AR |
30 | #include "HttpHdrCc.h" |
31 | #include "ip/tools.h" | |
32 | #include "ipc/FdNotes.h" | |
1ab04517 | 33 | #include "parser/Tokenizer.h" |
92ae4c86 AR |
34 | #include "servers/forward.h" |
35 | #include "servers/FtpServer.h" | |
36 | #include "SquidConfig.h" | |
37 | #include "StatCounters.h" | |
38 | #include "tools.h" | |
39 | ||
1ab04517 AR |
40 | #include <set> |
41 | #include <map> | |
42 | ||
92ae4c86 AR |
43 | CBDATA_NAMESPACED_CLASS_INIT(Ftp, Server); |
44 | ||
27c841f6 AR |
45 | namespace Ftp |
46 | { | |
92ae4c86 | 47 | static void PrintReply(MemBuf &mb, const HttpReply *reply, const char *const prefix = ""); |
1ab04517 AR |
48 | static bool SupportedCommand(const SBuf &name); |
49 | static bool CommandHasPathParameter(const SBuf &cmd); | |
92ae4c86 AR |
50 | }; |
51 | ||
52 | Ftp::Server::Server(const MasterXaction::Pointer &xact): | |
f53969cc SM |
53 | AsyncJob("Ftp::Server"), |
54 | ConnStateData(xact), | |
55 | master(new MasterState), | |
56 | uri(), | |
57 | host(), | |
58 | gotEpsvAll(false), | |
59 | onDataAcceptCall(), | |
60 | dataListenConn(), | |
61 | dataConn(), | |
62 | uploadAvailSize(0), | |
63 | listener(), | |
64 | connector(), | |
3238b9b6 CT |
65 | reader(), |
66 | waitingForOrigin(false), | |
67 | originDataDownloadAbortedOnError(false) | |
92ae4c86 | 68 | { |
92ae4c86 | 69 | flags.readMore = false; // we need to announce ourselves first |
4579a6d0 | 70 | *uploadBuf = 0; |
92ae4c86 AR |
71 | } |
72 | ||
73 | Ftp::Server::~Server() | |
74 | { | |
75 | closeDataConnection(); | |
76 | } | |
77 | ||
78 | int | |
79 | Ftp::Server::pipelinePrefetchMax() const | |
80 | { | |
81 | return 0; // no support for concurrent FTP requests | |
82 | } | |
83 | ||
84 | time_t | |
85 | Ftp::Server::idleTimeout() const | |
86 | { | |
87 | return Config.Timeout.ftpClientIdle; | |
88 | } | |
89 | ||
90 | void | |
91 | Ftp::Server::start() | |
92 | { | |
93 | ConnStateData::start(); | |
94 | ||
95 | if (transparent()) { | |
96 | char buf[MAX_IPSTRLEN]; | |
97 | clientConnection->local.toUrl(buf, MAX_IPSTRLEN); | |
98 | host = buf; | |
1ab04517 | 99 | calcUri(NULL); |
e7ce227f | 100 | debugs(33, 5, "FTP transparent URL: " << uri); |
92ae4c86 AR |
101 | } |
102 | ||
103 | writeEarlyReply(220, "Service ready"); | |
104 | } | |
105 | ||
106 | /// schedules another data connection read if needed | |
107 | void | |
108 | Ftp::Server::maybeReadUploadData() | |
109 | { | |
110 | if (reader != NULL) | |
111 | return; | |
112 | ||
113 | const size_t availSpace = sizeof(uploadBuf) - uploadAvailSize; | |
114 | if (availSpace <= 0) | |
115 | return; | |
116 | ||
e7ce227f | 117 | debugs(33, 4, dataConn << ": reading FTP data..."); |
92ae4c86 AR |
118 | |
119 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
120 | reader = JobCallback(33, 5, Dialer, this, Ftp::Server::readUploadData); | |
121 | comm_read(dataConn, uploadBuf + uploadAvailSize, availSpace, | |
122 | reader); | |
123 | } | |
124 | ||
125 | /// react to the freshly parsed request | |
126 | void | |
127 | Ftp::Server::doProcessRequest() | |
128 | { | |
129 | // zero pipelinePrefetchMax() ensures that there is only parsed request | |
e500cc89 | 130 | Must(pipeline.count() == 1); |
d3dddfb5 | 131 | Http::StreamPointer context = pipeline.front(); |
efd5e784 | 132 | Must(context != nullptr); |
92ae4c86 AR |
133 | |
134 | ClientHttpRequest *const http = context->http; | |
135 | assert(http != NULL); | |
92ae4c86 | 136 | |
eacfca83 AR |
137 | HttpRequest *const request = http->request; |
138 | Must(http->storeEntry() || request); | |
139 | const bool mayForward = !http->storeEntry() && handleRequest(request); | |
92ae4c86 AR |
140 | |
141 | if (http->storeEntry() != NULL) { | |
142 | debugs(33, 4, "got an immediate response"); | |
92ae4c86 AR |
143 | clientSetKeepaliveFlag(http); |
144 | context->pullData(); | |
eacfca83 | 145 | } else if (mayForward) { |
92ae4c86 AR |
146 | debugs(33, 4, "forwarding request to server side"); |
147 | assert(http->storeEntry() == NULL); | |
9bafa70d | 148 | clientProcessRequest(this, Http1::RequestParserPointer(), context.getRaw()); |
92ae4c86 AR |
149 | } else { |
150 | debugs(33, 4, "will resume processing later"); | |
151 | } | |
152 | } | |
153 | ||
154 | void | |
d3dddfb5 | 155 | Ftp::Server::processParsedRequest(Http::Stream *) |
92ae4c86 | 156 | { |
e500cc89 | 157 | Must(pipeline.count() == 1); |
eacfca83 | 158 | |
92ae4c86 AR |
159 | // Process FTP request asynchronously to make sure FTP |
160 | // data connection accept callback is fired first. | |
161 | CallJobHere(33, 4, CbcPointer<Server>(this), | |
162 | Ftp::Server, doProcessRequest); | |
163 | } | |
164 | ||
165 | /// imports more upload data from the data connection | |
166 | void | |
167 | Ftp::Server::readUploadData(const CommIoCbParams &io) | |
168 | { | |
e7ce227f | 169 | debugs(33, 5, io.conn << " size " << io.size); |
92ae4c86 AR |
170 | Must(reader != NULL); |
171 | reader = NULL; | |
172 | ||
173 | assert(Comm::IsConnOpen(dataConn)); | |
174 | assert(io.conn->fd == dataConn->fd); | |
175 | ||
176 | if (io.flag == Comm::OK && bodyPipe != NULL) { | |
177 | if (io.size > 0) { | |
a0864754 | 178 | statCounter.client_http.kbytes_in += io.size; |
92ae4c86 AR |
179 | |
180 | char *const current_buf = uploadBuf + uploadAvailSize; | |
181 | if (io.buf != current_buf) | |
182 | memmove(current_buf, io.buf, io.size); | |
183 | uploadAvailSize += io.size; | |
184 | shovelUploadData(); | |
185 | } else if (io.size == 0) { | |
e7ce227f | 186 | debugs(33, 5, io.conn << " closed"); |
92ae4c86 AR |
187 | closeDataConnection(); |
188 | if (uploadAvailSize <= 0) | |
189 | finishDechunkingRequest(true); | |
190 | } | |
191 | } else { // not Comm::Flags::OK or unexpected read | |
e7ce227f | 192 | debugs(33, 5, io.conn << " closed"); |
92ae4c86 AR |
193 | closeDataConnection(); |
194 | finishDechunkingRequest(false); | |
195 | } | |
196 | ||
197 | } | |
198 | ||
199 | /// shovel upload data from the internal buffer to the body pipe if possible | |
200 | void | |
201 | Ftp::Server::shovelUploadData() | |
202 | { | |
203 | assert(bodyPipe != NULL); | |
204 | ||
e7ce227f | 205 | debugs(33, 5, "handling FTP request data for " << clientConnection); |
92ae4c86 | 206 | const size_t putSize = bodyPipe->putMoreData(uploadBuf, |
27c841f6 | 207 | uploadAvailSize); |
92ae4c86 AR |
208 | if (putSize > 0) { |
209 | uploadAvailSize -= putSize; | |
210 | if (uploadAvailSize > 0) | |
211 | memmove(uploadBuf, uploadBuf + putSize, uploadAvailSize); | |
212 | } | |
213 | ||
214 | if (Comm::IsConnOpen(dataConn)) | |
215 | maybeReadUploadData(); | |
216 | else if (uploadAvailSize <= 0) | |
217 | finishDechunkingRequest(true); | |
218 | } | |
219 | ||
220 | void | |
221 | Ftp::Server::noteMoreBodySpaceAvailable(BodyPipe::Pointer) | |
222 | { | |
223 | shovelUploadData(); | |
224 | } | |
225 | ||
226 | void | |
227 | Ftp::Server::noteBodyConsumerAborted(BodyPipe::Pointer ptr) | |
228 | { | |
229 | ConnStateData::noteBodyConsumerAborted(ptr); | |
230 | closeDataConnection(); | |
231 | } | |
232 | ||
233 | /// accept a new FTP control connection and hand it to a dedicated Server | |
234 | void | |
235 | Ftp::Server::AcceptCtrlConnection(const CommAcceptCbParams ¶ms) | |
236 | { | |
237 | MasterXaction::Pointer xact = params.xaction; | |
238 | AnyP::PortCfgPointer s = xact->squidPort; | |
239 | ||
240 | // NP: it is possible the port was reconfigured when the call or accept() was queued. | |
241 | ||
242 | if (params.flag != Comm::OK) { | |
243 | // Its possible the call was still queued when the client disconnected | |
e7ce227f | 244 | debugs(33, 2, s->listenConn << ": FTP accept failure: " << xstrerr(params.xerrno)); |
92ae4c86 AR |
245 | return; |
246 | } | |
247 | ||
e7ce227f | 248 | debugs(33, 4, params.conn << ": accepted"); |
92ae4c86 AR |
249 | fd_note(params.conn->fd, "client ftp connect"); |
250 | ||
251 | if (s->tcp_keepalive.enabled) | |
252 | commSetTcpKeepalive(params.conn->fd, s->tcp_keepalive.idle, s->tcp_keepalive.interval, s->tcp_keepalive.timeout); | |
253 | ||
254 | ++incoming_sockets_accepted; | |
255 | ||
256 | AsyncJob::Start(new Server(xact)); | |
257 | } | |
258 | ||
259 | void | |
260 | Ftp::StartListening() | |
261 | { | |
262 | for (AnyP::PortCfgPointer s = FtpPortList; s != NULL; s = s->next) { | |
263 | if (MAXTCPLISTENPORTS == NHttpSockets) { | |
264 | debugs(1, DBG_IMPORTANT, "Ignoring ftp_port lines exceeding the" << | |
265 | " limit of " << MAXTCPLISTENPORTS << " ports."); | |
266 | break; | |
267 | } | |
268 | ||
269 | // direct new connections accepted by listenConn to Accept() | |
270 | typedef CommCbFunPtrCallT<CommAcceptCbPtrFun> AcceptCall; | |
271 | RefCount<AcceptCall> subCall = commCbCall(5, 5, "Ftp::Server::AcceptCtrlConnection", | |
27c841f6 | 272 | CommAcceptCbPtrFun(Ftp::Server::AcceptCtrlConnection, |
f53969cc | 273 | CommAcceptCbParams(NULL))); |
92ae4c86 AR |
274 | clientStartListeningOn(s, subCall, Ipc::fdnFtpSocket); |
275 | } | |
276 | } | |
277 | ||
278 | void | |
279 | Ftp::StopListening() | |
280 | { | |
ecba3352 | 281 | for (AnyP::PortCfgPointer s = FtpPortList; s != NULL; s = s->next) { |
92ae4c86 AR |
282 | if (s->listenConn != NULL) { |
283 | debugs(1, DBG_IMPORTANT, "Closing FTP port " << s->listenConn->local); | |
284 | s->listenConn->close(); | |
285 | s->listenConn = NULL; | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
290 | void | |
291 | Ftp::Server::notePeerConnection(Comm::ConnectionPointer conn) | |
292 | { | |
293 | // find request | |
d3dddfb5 | 294 | Http::StreamPointer context = pipeline.front(); |
efd5e784 | 295 | Must(context != nullptr); |
92ae4c86 AR |
296 | ClientHttpRequest *const http = context->http; |
297 | Must(http != NULL); | |
298 | HttpRequest *const request = http->request; | |
299 | Must(request != NULL); | |
300 | ||
301 | // this is not an idle connection, so we do not want I/O monitoring | |
302 | const bool monitor = false; | |
303 | ||
304 | // make FTP peer connection exclusive to our request | |
305 | pinConnection(conn, request, conn->getPeer(), false, monitor); | |
306 | } | |
307 | ||
308 | void | |
309 | Ftp::Server::clientPinnedConnectionClosed(const CommCloseCbParams &io) | |
310 | { | |
311 | ConnStateData::clientPinnedConnectionClosed(io); | |
312 | ||
92cfc72f CT |
313 | // TODO: Keep the control connection open after fixing the reset |
314 | // problem below | |
315 | if (Comm::IsConnOpen(clientConnection)) | |
316 | clientConnection->close(); | |
e7ce227f | 317 | |
92cfc72f CT |
318 | // TODO: If the server control connection is gone, reset state to login |
319 | // again. Reseting login alone is not enough: FtpRelay::sendCommand() will | |
51edd95f | 320 | // not re-login because FtpRelay::serverState() is not going to be |
92cfc72f CT |
321 | // fssConnected. Calling resetLogin() alone is also harmful because |
322 | // it does not reset correctly the client-to-squid control connection (eg | |
323 | // respond if required with an error code, in all cases) | |
324 | // resetLogin("control connection closure"); | |
92ae4c86 AR |
325 | } |
326 | ||
e7ce227f AR |
327 | /// clear client and server login-related state after the old login is gone |
328 | void | |
329 | Ftp::Server::resetLogin(const char *reason) | |
330 | { | |
331 | debugs(33, 5, "will need to re-login due to " << reason); | |
aea65fec | 332 | master->clientReadGreeting = false; |
e7ce227f AR |
333 | changeState(fssBegin, reason); |
334 | } | |
335 | ||
92ae4c86 AR |
336 | /// computes uri member from host and, if tracked, working dir with file name |
337 | void | |
1ab04517 | 338 | Ftp::Server::calcUri(const SBuf *file) |
92ae4c86 AR |
339 | { |
340 | uri = "ftp://"; | |
341 | uri.append(host); | |
aea65fec AR |
342 | if (port->ftp_track_dirs && master->workingDir.length()) { |
343 | if (master->workingDir[0] != '/') | |
ab4c5a36 | 344 | uri.append("/", 1); |
aea65fec | 345 | uri.append(master->workingDir); |
92ae4c86 AR |
346 | } |
347 | ||
1ab04517 | 348 | if (uri[uri.length() - 1] != '/') |
ab4c5a36 | 349 | uri.append("/", 1); |
92ae4c86 AR |
350 | |
351 | if (port->ftp_track_dirs && file) { | |
1ab04517 AR |
352 | static const CharacterSet Slash("/", "/"); |
353 | Parser::Tokenizer tok(*file); | |
354 | tok.skipAll(Slash); | |
355 | uri.append(tok.remaining()); | |
92ae4c86 AR |
356 | } |
357 | } | |
358 | ||
359 | /// Starts waiting for a data connection. Returns listening port. | |
360 | /// On errors, responds with an error and returns zero. | |
361 | unsigned int | |
362 | Ftp::Server::listenForDataConnection() | |
363 | { | |
364 | closeDataConnection(); | |
365 | ||
366 | Comm::ConnectionPointer conn = new Comm::Connection; | |
367 | conn->flags = COMM_NONBLOCKING; | |
368 | conn->local = transparent() ? port->s : clientConnection->local; | |
369 | conn->local.port(0); | |
1ab04517 | 370 | const char *const note = uri.c_str(); |
92ae4c86 AR |
371 | comm_open_listener(SOCK_STREAM, IPPROTO_TCP, conn, note); |
372 | if (!Comm::IsConnOpen(conn)) { | |
373 | debugs(5, DBG_CRITICAL, "comm_open_listener failed for FTP data: " << | |
374 | conn->local << " error: " << errno); | |
375 | writeCustomReply(451, "Internal error"); | |
376 | return 0; | |
377 | } | |
378 | ||
379 | typedef CommCbMemFunT<Server, CommAcceptCbParams> AcceptDialer; | |
380 | typedef AsyncCallT<AcceptDialer> AcceptCall; | |
381 | RefCount<AcceptCall> call = static_cast<AcceptCall*>(JobCallback(5, 5, AcceptDialer, this, Ftp::Server::acceptDataConnection)); | |
382 | Subscription::Pointer sub = new CallSubscription<AcceptCall>(call); | |
383 | listener = call.getRaw(); | |
384 | dataListenConn = conn; | |
385 | AsyncJob::Start(new Comm::TcpAcceptor(conn, note, sub)); | |
386 | ||
387 | const unsigned int listeningPort = comm_local_port(conn->fd); | |
388 | conn->local.port(listeningPort); | |
389 | return listeningPort; | |
390 | } | |
391 | ||
392 | void | |
393 | Ftp::Server::acceptDataConnection(const CommAcceptCbParams ¶ms) | |
394 | { | |
395 | if (params.flag != Comm::OK) { | |
396 | // Its possible the call was still queued when the client disconnected | |
397 | debugs(33, 2, dataListenConn << ": accept " | |
398 | "failure: " << xstrerr(params.xerrno)); | |
399 | return; | |
400 | } | |
401 | ||
402 | debugs(33, 4, "accepted " << params.conn); | |
403 | fd_note(params.conn->fd, "passive client ftp data"); | |
404 | ++incoming_sockets_accepted; | |
405 | ||
406 | if (!clientConnection) { | |
407 | debugs(33, 5, "late data connection?"); | |
408 | closeDataConnection(); // in case we are still listening | |
409 | params.conn->close(); | |
27c841f6 | 410 | } else if (params.conn->remote != clientConnection->remote) { |
92ae4c86 AR |
411 | debugs(33, 2, "rogue data conn? ctrl: " << clientConnection->remote); |
412 | params.conn->close(); | |
413 | // Some FTP servers close control connection here, but it may make | |
414 | // things worse from DoS p.o.v. and no better from data stealing p.o.v. | |
415 | } else { | |
416 | closeDataConnection(); | |
417 | dataConn = params.conn; | |
418 | uploadAvailSize = 0; | |
419 | debugs(33, 7, "ready for data"); | |
420 | if (onDataAcceptCall != NULL) { | |
421 | AsyncCall::Pointer call = onDataAcceptCall; | |
422 | onDataAcceptCall = NULL; | |
423 | // If we got an upload request, start reading data from the client. | |
aea65fec | 424 | if (master->serverState == fssHandleUploadRequest) |
92ae4c86 AR |
425 | maybeReadUploadData(); |
426 | else | |
aea65fec | 427 | Must(master->serverState == fssHandleDataRequest); |
92ae4c86 AR |
428 | MemBuf mb; |
429 | mb.init(); | |
4391cd15 | 430 | mb.appendf("150 Data connection opened.\r\n"); |
92ae4c86 AR |
431 | Comm::Write(clientConnection, &mb, call); |
432 | } | |
433 | } | |
434 | } | |
435 | ||
436 | void | |
437 | Ftp::Server::closeDataConnection() | |
438 | { | |
439 | if (listener != NULL) { | |
440 | listener->cancel("no longer needed"); | |
441 | listener = NULL; | |
442 | } | |
443 | ||
444 | if (Comm::IsConnOpen(dataListenConn)) { | |
e7ce227f | 445 | debugs(33, 5, "FTP closing client data listen socket: " << |
92ae4c86 AR |
446 | *dataListenConn); |
447 | dataListenConn->close(); | |
448 | } | |
449 | dataListenConn = NULL; | |
450 | ||
451 | if (reader != NULL) { | |
452 | // Comm::ReadCancel can deal with negative FDs | |
453 | Comm::ReadCancel(dataConn->fd, reader); | |
454 | reader = NULL; | |
455 | } | |
456 | ||
457 | if (Comm::IsConnOpen(dataConn)) { | |
e7ce227f | 458 | debugs(33, 5, "FTP closing client data connection: " << |
92ae4c86 AR |
459 | *dataConn); |
460 | dataConn->close(); | |
461 | } | |
462 | dataConn = NULL; | |
463 | } | |
464 | ||
465 | /// Writes FTP [error] response before we fully parsed the FTP request and | |
466 | /// created the corresponding HTTP request wrapper for that FTP request. | |
467 | void | |
468 | Ftp::Server::writeEarlyReply(const int code, const char *msg) | |
469 | { | |
e7ce227f | 470 | debugs(33, 7, code << ' ' << msg); |
92ae4c86 AR |
471 | assert(99 < code && code < 1000); |
472 | ||
473 | MemBuf mb; | |
474 | mb.init(); | |
4391cd15 | 475 | mb.appendf("%i %s\r\n", code, msg); |
92ae4c86 AR |
476 | |
477 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
478 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteEarlyReply); | |
479 | Comm::Write(clientConnection, &mb, call); | |
480 | ||
481 | flags.readMore = false; | |
482 | ||
483 | // TODO: Create master transaction. Log it in wroteEarlyReply(). | |
484 | } | |
485 | ||
486 | void | |
487 | Ftp::Server::writeReply(MemBuf &mb) | |
488 | { | |
aea65fec AR |
489 | debugs(9, 2, "FTP Client " << clientConnection); |
490 | debugs(9, 2, "FTP Client REPLY:\n---------\n" << mb.buf << | |
92ae4c86 AR |
491 | "\n----------"); |
492 | ||
493 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
494 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteReply); | |
495 | Comm::Write(clientConnection, &mb, call); | |
496 | } | |
497 | ||
498 | void | |
499 | Ftp::Server::writeCustomReply(const int code, const char *msg, const HttpReply *reply) | |
500 | { | |
e7ce227f | 501 | debugs(33, 7, code << ' ' << msg); |
92ae4c86 AR |
502 | assert(99 < code && code < 1000); |
503 | ||
504 | const bool sendDetails = reply != NULL && | |
789217a2 | 505 | reply->header.has(Http::HdrType::FTP_STATUS) && reply->header.has(Http::HdrType::FTP_REASON); |
92ae4c86 AR |
506 | |
507 | MemBuf mb; | |
508 | mb.init(); | |
509 | if (sendDetails) { | |
4391cd15 AJ |
510 | mb.appendf("%i-%s\r\n", code, msg); |
511 | mb.appendf(" Server reply:\r\n"); | |
92ae4c86 | 512 | Ftp::PrintReply(mb, reply, " "); |
4391cd15 | 513 | mb.appendf("%i \r\n", code); |
92ae4c86 | 514 | } else |
4391cd15 | 515 | mb.appendf("%i %s\r\n", code, msg); |
92ae4c86 AR |
516 | |
517 | writeReply(mb); | |
518 | } | |
519 | ||
520 | void | |
521 | Ftp::Server::changeState(const ServerState newState, const char *reason) | |
522 | { | |
aea65fec AR |
523 | if (master->serverState == newState) { |
524 | debugs(33, 3, "client state unchanged at " << master->serverState << | |
92ae4c86 | 525 | " because " << reason); |
aea65fec | 526 | master->serverState = newState; |
92ae4c86 | 527 | } else { |
aea65fec | 528 | debugs(33, 3, "client state was " << master->serverState << |
92ae4c86 | 529 | ", now " << newState << " because " << reason); |
aea65fec | 530 | master->serverState = newState; |
92ae4c86 AR |
531 | } |
532 | } | |
533 | ||
534 | /// whether the given FTP command has a pathname parameter | |
535 | static bool | |
1ab04517 AR |
536 | Ftp::CommandHasPathParameter(const SBuf &cmd) |
537 | { | |
538 | static std::set<SBuf> PathedCommands; | |
539 | if (!PathedCommands.size()) { | |
540 | PathedCommands.insert(cmdMlst()); | |
541 | PathedCommands.insert(cmdMlsd()); | |
542 | PathedCommands.insert(cmdStat()); | |
543 | PathedCommands.insert(cmdNlst()); | |
544 | PathedCommands.insert(cmdList()); | |
545 | PathedCommands.insert(cmdMkd()); | |
546 | PathedCommands.insert(cmdRmd()); | |
547 | PathedCommands.insert(cmdDele()); | |
548 | PathedCommands.insert(cmdRnto()); | |
549 | PathedCommands.insert(cmdRnfr()); | |
550 | PathedCommands.insert(cmdAppe()); | |
551 | PathedCommands.insert(cmdStor()); | |
552 | PathedCommands.insert(cmdRetr()); | |
553 | PathedCommands.insert(cmdSmnt()); | |
554 | PathedCommands.insert(cmdCwd()); | |
555 | } | |
556 | ||
557 | return PathedCommands.find(cmd) != PathedCommands.end(); | |
92ae4c86 AR |
558 | } |
559 | ||
eacfca83 | 560 | /// creates a context filled with an error message for a given early error |
d3dddfb5 | 561 | Http::Stream * |
eacfca83 AR |
562 | Ftp::Server::earlyError(const EarlyErrorKind eek) |
563 | { | |
564 | /* Default values, to be updated by the switch statement below */ | |
565 | int scode = 421; | |
566 | const char *reason = "Internal error"; | |
567 | const char *errUri = "error:ftp-internal-early-error"; | |
568 | ||
569 | switch (eek) { | |
3aab028c | 570 | case EarlyErrorKind::HugeRequest: |
eacfca83 AR |
571 | scode = 421; |
572 | reason = "Huge request"; | |
573 | errUri = "error:ftp-huge-request"; | |
574 | break; | |
575 | ||
3aab028c | 576 | case EarlyErrorKind::MissingLogin: |
eacfca83 AR |
577 | scode = 530; |
578 | reason = "Must login first"; | |
579 | errUri = "error:ftp-must-login-first"; | |
580 | break; | |
581 | ||
3aab028c | 582 | case EarlyErrorKind::MissingUsername: |
eacfca83 AR |
583 | scode = 501; |
584 | reason = "Missing username"; | |
585 | errUri = "error:ftp-missing-username"; | |
586 | break; | |
587 | ||
3aab028c | 588 | case EarlyErrorKind::MissingHost: |
eacfca83 AR |
589 | scode = 501; |
590 | reason = "Missing host"; | |
591 | errUri = "error:ftp-missing-host"; | |
592 | break; | |
593 | ||
3aab028c | 594 | case EarlyErrorKind::UnsupportedCommand: |
eacfca83 AR |
595 | scode = 502; |
596 | reason = "Unknown or unsupported command"; | |
597 | errUri = "error:ftp-unsupported-command"; | |
598 | break; | |
599 | ||
3aab028c | 600 | case EarlyErrorKind::InvalidUri: |
eacfca83 AR |
601 | scode = 501; |
602 | reason = "Invalid URI"; | |
603 | errUri = "error:ftp-invalid-uri"; | |
604 | break; | |
605 | ||
3aab028c | 606 | case EarlyErrorKind::MalformedCommand: |
eacfca83 AR |
607 | scode = 421; |
608 | reason = "Malformed command"; | |
609 | errUri = "error:ftp-malformed-command"; | |
610 | break; | |
611 | ||
74d4eef6 | 612 | // no default so that a compiler can check that we have covered all cases |
eacfca83 AR |
613 | } |
614 | ||
d3dddfb5 | 615 | Http::Stream *context = abortRequestParsing(errUri); |
eacfca83 AR |
616 | clientStreamNode *node = context->getClientReplyContext(); |
617 | Must(node); | |
618 | clientReplyContext *repContext = dynamic_cast<clientReplyContext *>(node->data.getRaw()); | |
3d01c5ab | 619 | Must(repContext); |
eacfca83 AR |
620 | |
621 | // We cannot relay FTP scode/reason via HTTP-specific ErrorState. | |
622 | // TODO: When/if ErrorState can handle native FTP errors, use it instead. | |
623 | HttpReply *reply = Ftp::HttpReplyWrapper(scode, reason, Http::scBadRequest, -1); | |
624 | repContext->setReplyToReply(reply); | |
625 | return context; | |
626 | } | |
627 | ||
92ae4c86 | 628 | /// Parses a single FTP request on the control connection. |
d3dddfb5 | 629 | /// Returns a new Http::Stream on valid requests and all errors. |
eacfca83 | 630 | /// Returns NULL on incomplete requests that may still succeed given more data. |
d3dddfb5 | 631 | Http::Stream * |
9bafa70d | 632 | Ftp::Server::parseOneRequest() |
92ae4c86 | 633 | { |
eacfca83 AR |
634 | flags.readMore = false; // common for all but one case below |
635 | ||
1ab04517 | 636 | // OWS <command> [ RWS <parameter> ] OWS LF |
aea65fec AR |
637 | |
638 | // InlineSpaceChars are isspace(3) or RFC 959 Section 3.1.1.5.2, except | |
639 | // for the LF character that we must exclude here (but see FullWhiteSpace). | |
640 | static const char * const InlineSpaceChars = " \f\r\t\v"; | |
641 | static const CharacterSet InlineSpace = CharacterSet("Ftp::Inline", InlineSpaceChars); | |
642 | static const CharacterSet FullWhiteSpace = (InlineSpace + CharacterSet::LF).rename("Ftp::FWS"); | |
643 | static const CharacterSet CommandChars = FullWhiteSpace.complement("Ftp::Command"); | |
644 | static const CharacterSet TailChars = CharacterSet::LF.complement("Ftp::Tail"); | |
92ae4c86 | 645 | |
1ab04517 AR |
646 | // This set is used to ignore empty commands without allowing an attacker |
647 | // to keep us endlessly busy by feeding us whitespace or empty commands. | |
aea65fec | 648 | static const CharacterSet &LeadingSpace = FullWhiteSpace; |
92ae4c86 | 649 | |
1ab04517 AR |
650 | SBuf cmd; |
651 | SBuf params; | |
92ae4c86 | 652 | |
fcc444e3 | 653 | Parser::Tokenizer tok(inBuf); |
92ae4c86 | 654 | |
1ab04517 | 655 | (void)tok.skipAll(LeadingSpace); // leading OWS and empty commands |
aea65fec | 656 | const bool parsed = tok.prefix(cmd, CommandChars); // required command |
92ae4c86 | 657 | |
1ab04517 | 658 | // note that the condition below will eat either RWS or trailing OWS |
aea65fec | 659 | if (parsed && tok.skipAll(InlineSpace) && tok.prefix(params, TailChars)) { |
1ab04517 AR |
660 | // now params may include trailing OWS |
661 | // TODO: Support right-trimming using CharacterSet in Tokenizer instead | |
aea65fec | 662 | static const SBuf bufWhiteSpace(InlineSpaceChars); |
1ab04517 | 663 | params.trim(bufWhiteSpace, false, true); |
92ae4c86 AR |
664 | } |
665 | ||
eacfca83 AR |
666 | // Why limit command line and parameters size? Did not we just parse them? |
667 | // XXX: Our good old String cannot handle very long strings. | |
668 | const SBuf::size_type tokenMax = min( | |
74d4eef6 A |
669 | static_cast<SBuf::size_type>(32*1024), // conservative |
670 | static_cast<SBuf::size_type>(Config.maxRequestHeaderSize)); | |
eacfca83 AR |
671 | if (cmd.length() > tokenMax || params.length() > tokenMax) { |
672 | changeState(fssError, "huge req token"); | |
673 | quitAfterError(NULL); | |
3aab028c | 674 | return earlyError(EarlyErrorKind::HugeRequest); |
eacfca83 AR |
675 | } |
676 | ||
1ab04517 | 677 | // technically, we may skip multiple NLs below, but that is OK |
aea65fec | 678 | if (!parsed || !tok.skipAll(CharacterSet::LF)) { // did not find terminating LF yet |
1ab04517 | 679 | // we need more data, but can we buffer more? |
fcc444e3 | 680 | if (inBuf.length() >= Config.maxRequestHeaderSize) { |
1ab04517 | 681 | changeState(fssError, "huge req"); |
eacfca83 | 682 | quitAfterError(NULL); |
3aab028c | 683 | return earlyError(EarlyErrorKind::HugeRequest); |
1ab04517 | 684 | } else { |
eacfca83 | 685 | flags.readMore = true; |
1ab04517 | 686 | debugs(33, 5, "Waiting for more, up to " << |
fcc444e3 | 687 | (Config.maxRequestHeaderSize - inBuf.length())); |
1ab04517 AR |
688 | return NULL; |
689 | } | |
690 | } | |
92ae4c86 | 691 | |
1ab04517 AR |
692 | Must(parsed && cmd.length()); |
693 | consumeInput(tok.parsedSize()); // TODO: Would delaying optimize copying? | |
92ae4c86 | 694 | |
1ab04517 | 695 | debugs(33, 2, ">>ftp " << cmd << (params.isEmpty() ? "" : " ") << params); |
92ae4c86 | 696 | |
1ab04517 | 697 | cmd.toUpper(); // this should speed up and simplify future comparisons |
92ae4c86 | 698 | |
e7ce227f AR |
699 | // interception cases do not need USER to calculate the uri |
700 | if (!transparent()) { | |
aea65fec | 701 | if (!master->clientReadGreeting) { |
e7ce227f | 702 | // the first command must be USER |
eacfca83 | 703 | if (!pinning.pinned && cmd != cmdUser()) |
3aab028c | 704 | return earlyError(EarlyErrorKind::MissingLogin); |
92ae4c86 | 705 | } |
92ae4c86 | 706 | |
e7ce227f | 707 | // process USER request now because it sets FTP peer host name |
eacfca83 | 708 | if (cmd == cmdUser()) { |
d3dddfb5 | 709 | if (Http::Stream *errCtx = handleUserRequest(cmd, params)) |
eacfca83 AR |
710 | return errCtx; |
711 | } | |
e7ce227f | 712 | } |
92ae4c86 | 713 | |
eacfca83 | 714 | if (!Ftp::SupportedCommand(cmd)) |
3aab028c | 715 | return earlyError(EarlyErrorKind::UnsupportedCommand); |
92ae4c86 AR |
716 | |
717 | const HttpRequestMethod method = | |
1ab04517 | 718 | cmd == cmdAppe() || cmd == cmdStor() || cmd == cmdStou() ? |
92ae4c86 AR |
719 | Http::METHOD_PUT : Http::METHOD_GET; |
720 | ||
aea65fec | 721 | const SBuf *path = (params.length() && CommandHasPathParameter(cmd)) ? |
27c841f6 | 722 | ¶ms : NULL; |
1ab04517 AR |
723 | calcUri(path); |
724 | char *newUri = xstrdup(uri.c_str()); | |
d6067ac1 | 725 | HttpRequest *const request = HttpRequest::CreateFromUrl(newUri, method); |
92ae4c86 | 726 | if (!request) { |
e7ce227f | 727 | debugs(33, 5, "Invalid FTP URL: " << uri); |
1ab04517 | 728 | uri.clear(); |
92ae4c86 | 729 | safe_free(newUri); |
3aab028c | 730 | return earlyError(EarlyErrorKind::InvalidUri); |
92ae4c86 AR |
731 | } |
732 | ||
733 | request->flags.ftpNative = true; | |
9bafa70d | 734 | request->http_ver = Http::ProtocolVersion(Ftp::ProtocolVersion().major, Ftp::ProtocolVersion().minor); |
92ae4c86 AR |
735 | |
736 | // Our fake Request-URIs are not distinctive enough for caching to work | |
737 | request->flags.cachable = false; // XXX: reset later by maybeCacheable() | |
738 | request->flags.noCache = true; | |
739 | ||
789217a2 FC |
740 | request->header.putStr(Http::HdrType::FTP_COMMAND, cmd.c_str()); |
741 | request->header.putStr(Http::HdrType::FTP_ARGUMENTS, params.c_str()); // may be "" | |
92ae4c86 | 742 | if (method == Http::METHOD_PUT) { |
789217a2 FC |
743 | request->header.putStr(Http::HdrType::EXPECT, "100-continue"); |
744 | request->header.putStr(Http::HdrType::TRANSFER_ENCODING, "chunked"); | |
92ae4c86 AR |
745 | } |
746 | ||
747 | ClientHttpRequest *const http = new ClientHttpRequest(this); | |
748 | http->request = request; | |
749 | HTTPMSGLOCK(http->request); | |
1ab04517 | 750 | http->req_sz = tok.parsedSize(); |
92ae4c86 AR |
751 | http->uri = newUri; |
752 | ||
d3dddfb5 AJ |
753 | Http::Stream *const result = |
754 | new Http::Stream(clientConnection, http); | |
92ae4c86 AR |
755 | |
756 | StoreIOBuffer tempBuffer; | |
757 | tempBuffer.data = result->reqbuf; | |
758 | tempBuffer.length = HTTP_REQBUF_SZ; | |
759 | ||
760 | ClientStreamData newServer = new clientReplyContext(http); | |
761 | ClientStreamData newClient = result; | |
762 | clientStreamInit(&http->client_stream, clientGetMoreData, clientReplyDetach, | |
763 | clientReplyStatus, newServer, clientSocketRecipient, | |
764 | clientSocketDetach, newClient, tempBuffer); | |
765 | ||
92ae4c86 | 766 | result->flags.parsed_ok = 1; |
92ae4c86 AR |
767 | return result; |
768 | } | |
769 | ||
770 | void | |
771 | Ftp::Server::handleReply(HttpReply *reply, StoreIOBuffer data) | |
772 | { | |
773 | // the caller guarantees that we are dealing with the current context only | |
d3dddfb5 | 774 | Http::StreamPointer context = pipeline.front(); |
efd5e784 | 775 | assert(context != nullptr); |
92ae4c86 AR |
776 | |
777 | if (context->http && context->http->al != NULL && | |
27c841f6 | 778 | !context->http->al->reply && reply) { |
92ae4c86 AR |
779 | context->http->al->reply = reply; |
780 | HTTPMSGLOCK(context->http->al->reply); | |
781 | } | |
782 | ||
783 | static ReplyHandler handlers[] = { | |
784 | NULL, // fssBegin | |
785 | NULL, // fssConnected | |
786 | &Ftp::Server::handleFeatReply, // fssHandleFeat | |
787 | &Ftp::Server::handlePasvReply, // fssHandlePasv | |
788 | &Ftp::Server::handlePortReply, // fssHandlePort | |
789 | &Ftp::Server::handleDataReply, // fssHandleDataRequest | |
790 | &Ftp::Server::handleUploadReply, // fssHandleUploadRequest | |
791 | &Ftp::Server::handleEprtReply,// fssHandleEprt | |
792 | &Ftp::Server::handleEpsvReply,// fssHandleEpsv | |
793 | NULL, // fssHandleCwd | |
3cc0f4e7 | 794 | NULL, // fssHandlePass |
92ae4c86 AR |
795 | NULL, // fssHandleCdup |
796 | &Ftp::Server::handleErrorReply // fssError | |
797 | }; | |
0d253dfa CT |
798 | try { |
799 | const Server &server = dynamic_cast<const Ftp::Server&>(*context->getConn()); | |
800 | if (const ReplyHandler handler = handlers[server.master->serverState]) | |
801 | (this->*handler)(reply, data); | |
802 | else | |
803 | writeForwardedReply(reply); | |
804 | } catch (const std::exception &e) { | |
805 | callException(e); | |
806 | throw TexcHere(e.what()); | |
807 | } | |
92ae4c86 AR |
808 | } |
809 | ||
810 | void | |
aea65fec | 811 | Ftp::Server::handleFeatReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 812 | { |
efd5e784 | 813 | if (pipeline.front()->http->request->errType != ERR_NONE) { |
92ae4c86 AR |
814 | writeCustomReply(502, "Server does not support FEAT", reply); |
815 | return; | |
816 | } | |
817 | ||
0d253dfa | 818 | Must(reply); |
f0174f5b CT |
819 | HttpReply::Pointer featReply = Ftp::HttpReplyWrapper(211, "End", Http::scNoContent, 0); |
820 | HttpHeader const &serverReplyHeader = reply->header; | |
92ae4c86 | 821 | |
92ae4c86 AR |
822 | HttpHeaderPos pos = HttpHeaderInitPos; |
823 | bool hasEPRT = false; | |
824 | bool hasEPSV = false; | |
825 | int prependSpaces = 1; | |
f0174f5b | 826 | |
789217a2 FC |
827 | featReply->header.putStr(Http::HdrType::FTP_PRE, "\"211-Features:\""); |
828 | const int scode = serverReplyHeader.getInt(Http::HdrType::FTP_STATUS); | |
f0174f5b CT |
829 | if (scode == 211) { |
830 | while (const HttpHeaderEntry *e = serverReplyHeader.getEntry(&pos)) { | |
789217a2 | 831 | if (e->id == Http::HdrType::FTP_PRE) { |
f0174f5b CT |
832 | // assume RFC 2389 FEAT response format, quoted by Squid: |
833 | // <"> SP NAME [SP PARAMS] <"> | |
834 | // but accommodate MS servers sending four SPs before NAME | |
835 | ||
836 | // command name ends with (SP parameter) or quote | |
837 | static const CharacterSet AfterFeatNameChars("AfterFeatName", " \""); | |
838 | static const CharacterSet FeatNameChars = AfterFeatNameChars.complement("FeatName"); | |
839 | ||
840 | Parser::Tokenizer tok(SBuf(e->value.termedBuf())); | |
841 | if (!tok.skip('"') || !tok.skip(' ')) | |
842 | continue; | |
843 | ||
844 | // optional spaces; remember their number to accomodate MS servers | |
845 | prependSpaces = 1 + tok.skipAll(CharacterSet::SP); | |
846 | ||
847 | SBuf cmd; | |
848 | if (!tok.prefix(cmd, FeatNameChars)) | |
849 | continue; | |
850 | cmd.toUpper(); | |
851 | ||
852 | if (Ftp::SupportedCommand(cmd)) { | |
853 | featReply->header.addEntry(e->clone()); | |
854 | } | |
855 | ||
856 | if (cmd == cmdEprt()) | |
857 | hasEPRT = true; | |
858 | else if (cmd == cmdEpsv()) | |
859 | hasEPSV = true; | |
860 | } | |
92ae4c86 | 861 | } |
f0174f5b | 862 | } // else we got a FEAT error and will only report Squid-supported features |
92ae4c86 AR |
863 | |
864 | char buf[256]; | |
92ae4c86 AR |
865 | if (!hasEPRT) { |
866 | snprintf(buf, sizeof(buf), "\"%*s\"", prependSpaces + 4, "EPRT"); | |
789217a2 | 867 | featReply->header.putStr(Http::HdrType::FTP_PRE, buf); |
92ae4c86 AR |
868 | } |
869 | if (!hasEPSV) { | |
870 | snprintf(buf, sizeof(buf), "\"%*s\"", prependSpaces + 4, "EPSV"); | |
789217a2 | 871 | featReply->header.putStr(Http::HdrType::FTP_PRE, buf); |
92ae4c86 AR |
872 | } |
873 | ||
f0174f5b | 874 | featReply->header.refreshMask(); |
92ae4c86 | 875 | |
f0174f5b | 876 | writeForwardedReply(featReply.getRaw()); |
92ae4c86 AR |
877 | } |
878 | ||
879 | void | |
aea65fec | 880 | Ftp::Server::handlePasvReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 881 | { |
d3dddfb5 | 882 | const Http::StreamPointer context(pipeline.front()); |
efd5e784 | 883 | assert(context != nullptr); |
92ae4c86 AR |
884 | |
885 | if (context->http->request->errType != ERR_NONE) { | |
886 | writeCustomReply(502, "Server does not support PASV", reply); | |
887 | return; | |
888 | } | |
889 | ||
890 | const unsigned short localPort = listenForDataConnection(); | |
891 | if (!localPort) | |
892 | return; | |
893 | ||
894 | char addr[MAX_IPSTRLEN]; | |
895 | // remote server in interception setups and local address otherwise | |
896 | const Ip::Address &server = transparent() ? | |
897 | clientConnection->local : dataListenConn->local; | |
898 | server.toStr(addr, MAX_IPSTRLEN, AF_INET); | |
899 | addr[MAX_IPSTRLEN - 1] = '\0'; | |
900 | for (char *c = addr; *c != '\0'; ++c) { | |
901 | if (*c == '.') | |
902 | *c = ','; | |
903 | } | |
904 | ||
905 | // In interception setups, we combine remote server address with a | |
906 | // local port number and hope that traffic will be redirected to us. | |
907 | // Do not use "227 =a,b,c,d,p1,p2" format or omit parens: some nf_ct_ftp | |
908 | // versions block responses that use those alternative syntax rules! | |
909 | MemBuf mb; | |
910 | mb.init(); | |
4391cd15 | 911 | mb.appendf("227 Entering Passive Mode (%s,%i,%i).\r\n", |
f680026f SM |
912 | addr, |
913 | static_cast<int>(localPort / 256), | |
914 | static_cast<int>(localPort % 256)); | |
aea65fec | 915 | debugs(9, 3, Raw("writing", mb.buf, mb.size)); |
92ae4c86 AR |
916 | writeReply(mb); |
917 | } | |
918 | ||
919 | void | |
aea65fec | 920 | Ftp::Server::handlePortReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 921 | { |
efd5e784 | 922 | if (pipeline.front()->http->request->errType != ERR_NONE) { |
92ae4c86 AR |
923 | writeCustomReply(502, "Server does not support PASV (converted from PORT)", reply); |
924 | return; | |
925 | } | |
926 | ||
927 | writeCustomReply(200, "PORT successfully converted to PASV."); | |
928 | ||
929 | // and wait for RETR | |
930 | } | |
931 | ||
932 | void | |
aea65fec | 933 | Ftp::Server::handleErrorReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 AR |
934 | { |
935 | if (!pinning.pinned) // we failed to connect to server | |
1ab04517 | 936 | uri.clear(); |
92ae4c86 AR |
937 | // 421: we will close due to fssError |
938 | writeErrorReply(reply, 421); | |
939 | } | |
940 | ||
941 | void | |
942 | Ftp::Server::handleDataReply(const HttpReply *reply, StoreIOBuffer data) | |
943 | { | |
944 | if (reply != NULL && reply->sline.status() != Http::scOkay) { | |
945 | writeForwardedReply(reply); | |
946 | if (Comm::IsConnOpen(dataConn)) { | |
947 | debugs(33, 3, "closing " << dataConn << " on KO reply"); | |
948 | closeDataConnection(); | |
949 | } | |
950 | return; | |
951 | } | |
952 | ||
953 | if (!dataConn) { | |
954 | // We got STREAM_COMPLETE (or error) and closed the client data conn. | |
955 | debugs(33, 3, "ignoring FTP srv data response after clt data closure"); | |
956 | return; | |
957 | } | |
958 | ||
959 | if (!checkDataConnPost()) { | |
960 | writeCustomReply(425, "Data connection is not established."); | |
961 | closeDataConnection(); | |
962 | return; | |
963 | } | |
964 | ||
e7ce227f | 965 | debugs(33, 7, data.length); |
92ae4c86 AR |
966 | |
967 | if (data.length <= 0) { | |
968 | replyDataWritingCheckpoint(); // skip the actual write call | |
969 | return; | |
970 | } | |
971 | ||
972 | MemBuf mb; | |
973 | mb.init(data.length + 1, data.length + 1); | |
974 | mb.append(data.data, data.length); | |
975 | ||
976 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
977 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteReplyData); | |
978 | Comm::Write(dataConn, &mb, call); | |
979 | ||
efd5e784 | 980 | pipeline.front()->noteSentBodyBytes(data.length); |
92ae4c86 AR |
981 | } |
982 | ||
983 | /// called when we are done writing a chunk of the response data | |
984 | void | |
985 | Ftp::Server::wroteReplyData(const CommIoCbParams &io) | |
986 | { | |
987 | if (io.flag == Comm::ERR_CLOSING) | |
988 | return; | |
989 | ||
990 | if (io.flag != Comm::OK) { | |
aea65fec | 991 | debugs(33, 3, "FTP reply data writing failed: " << xstrerr(io.xerrno)); |
92cfc72f | 992 | userDataCompletionCheckpoint(426); |
92ae4c86 AR |
993 | return; |
994 | } | |
995 | ||
efd5e784 AJ |
996 | assert(pipeline.front()->http); |
997 | pipeline.front()->http->out.size += io.size; | |
92ae4c86 AR |
998 | replyDataWritingCheckpoint(); |
999 | } | |
1000 | ||
1001 | /// ClientStream checks after (actual or skipped) reply data writing | |
1002 | void | |
27c841f6 AR |
1003 | Ftp::Server::replyDataWritingCheckpoint() |
1004 | { | |
efd5e784 | 1005 | switch (pipeline.front()->socketState()) { |
92ae4c86 AR |
1006 | case STREAM_NONE: |
1007 | debugs(33, 3, "Keep going"); | |
efd5e784 | 1008 | pipeline.front()->pullData(); |
92ae4c86 AR |
1009 | return; |
1010 | case STREAM_COMPLETE: | |
e7ce227f | 1011 | debugs(33, 3, "FTP reply data transfer successfully complete"); |
92cfc72f | 1012 | userDataCompletionCheckpoint(226); |
92ae4c86 AR |
1013 | break; |
1014 | case STREAM_UNPLANNED_COMPLETE: | |
e7ce227f | 1015 | debugs(33, 3, "FTP reply data transfer failed: STREAM_UNPLANNED_COMPLETE"); |
92cfc72f | 1016 | userDataCompletionCheckpoint(451); |
92ae4c86 AR |
1017 | break; |
1018 | case STREAM_FAILED: | |
92cfc72f | 1019 | userDataCompletionCheckpoint(451); |
e7ce227f | 1020 | debugs(33, 3, "FTP reply data transfer failed: STREAM_FAILED"); |
92ae4c86 AR |
1021 | break; |
1022 | default: | |
1023 | fatal("unreachable code"); | |
1024 | } | |
92ae4c86 AR |
1025 | } |
1026 | ||
1027 | void | |
aea65fec | 1028 | Ftp::Server::handleUploadReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 AR |
1029 | { |
1030 | writeForwardedReply(reply); | |
1031 | // note that the client data connection may already be closed by now | |
1032 | } | |
1033 | ||
1034 | void | |
1035 | Ftp::Server::writeForwardedReply(const HttpReply *reply) | |
1036 | { | |
0d253dfa CT |
1037 | Must(reply); |
1038 | ||
3238b9b6 CT |
1039 | if (waitingForOrigin) { |
1040 | Must(delayedReply == NULL); | |
1041 | delayedReply = reply; | |
1042 | return; | |
1043 | } | |
1044 | ||
92ae4c86 | 1045 | const HttpHeader &header = reply->header; |
789217a2 FC |
1046 | // adaptation and forwarding errors lack Http::HdrType::FTP_STATUS |
1047 | if (!header.has(Http::HdrType::FTP_STATUS)) { | |
92ae4c86 AR |
1048 | writeForwardedForeign(reply); // will get to Ftp::Server::wroteReply |
1049 | return; | |
1050 | } | |
1051 | ||
1052 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
1053 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteReply); | |
1054 | writeForwardedReplyAndCall(reply, call); | |
1055 | } | |
1056 | ||
1057 | void | |
aea65fec | 1058 | Ftp::Server::handleEprtReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 1059 | { |
efd5e784 | 1060 | if (pipeline.front()->http->request->errType != ERR_NONE) { |
92ae4c86 AR |
1061 | writeCustomReply(502, "Server does not support PASV (converted from EPRT)", reply); |
1062 | return; | |
1063 | } | |
1064 | ||
1065 | writeCustomReply(200, "EPRT successfully converted to PASV."); | |
1066 | ||
1067 | // and wait for RETR | |
1068 | } | |
1069 | ||
1070 | void | |
aea65fec | 1071 | Ftp::Server::handleEpsvReply(const HttpReply *reply, StoreIOBuffer) |
92ae4c86 | 1072 | { |
efd5e784 | 1073 | if (pipeline.front()->http->request->errType != ERR_NONE) { |
92ae4c86 AR |
1074 | writeCustomReply(502, "Cannot connect to server", reply); |
1075 | return; | |
1076 | } | |
1077 | ||
1078 | const unsigned short localPort = listenForDataConnection(); | |
1079 | if (!localPort) | |
1080 | return; | |
1081 | ||
aea65fec AR |
1082 | // In interception setups, we use a local port number and hope that data |
1083 | // traffic will be redirected to us. | |
92ae4c86 AR |
1084 | MemBuf mb; |
1085 | mb.init(); | |
4391cd15 | 1086 | mb.appendf("229 Entering Extended Passive Mode (|||%u|)\r\n", localPort); |
92ae4c86 | 1087 | |
aea65fec | 1088 | debugs(9, 3, Raw("writing", mb.buf, mb.size)); |
92ae4c86 AR |
1089 | writeReply(mb); |
1090 | } | |
1091 | ||
1092 | /// writes FTP error response with given status and reply-derived error details | |
1093 | void | |
1094 | Ftp::Server::writeErrorReply(const HttpReply *reply, const int scode) | |
1095 | { | |
efd5e784 | 1096 | const HttpRequest *request = pipeline.front()->http->request; |
92ae4c86 AR |
1097 | assert(request); |
1098 | ||
1099 | MemBuf mb; | |
1100 | mb.init(); | |
1101 | ||
1102 | if (request->errType != ERR_NONE) | |
4391cd15 | 1103 | mb.appendf("%i-%s\r\n", scode, errorPageName(request->errType)); |
92ae4c86 AR |
1104 | |
1105 | if (request->errDetail > 0) { | |
1106 | // XXX: > 0 may not always mean that this is an errno | |
4391cd15 | 1107 | mb.appendf("%i-Error: (%d) %s\r\n", scode, |
f680026f SM |
1108 | request->errDetail, |
1109 | strerror(request->errDetail)); | |
92ae4c86 AR |
1110 | } |
1111 | ||
02e1ed26 | 1112 | #if USE_ADAPTATION |
92ae4c86 AR |
1113 | // XXX: Remove hard coded names. Use an error page template instead. |
1114 | const Adaptation::History::Pointer ah = request->adaptHistory(); | |
1115 | if (ah != NULL) { // XXX: add adapt::<all_h but use lastMeta here | |
1116 | const String info = ah->allMeta.getByName("X-Response-Info"); | |
1117 | const String desc = ah->allMeta.getByName("X-Response-Desc"); | |
1118 | if (info.size()) | |
4391cd15 | 1119 | mb.appendf("%i-Information: %s\r\n", scode, info.termedBuf()); |
92ae4c86 | 1120 | if (desc.size()) |
4391cd15 | 1121 | mb.appendf("%i-Description: %s\r\n", scode, desc.termedBuf()); |
92ae4c86 | 1122 | } |
02e1ed26 | 1123 | #endif |
92ae4c86 | 1124 | |
0d253dfa | 1125 | Must(reply); |
789217a2 FC |
1126 | const char *reason = reply->header.has(Http::HdrType::FTP_REASON) ? |
1127 | reply->header.getStr(Http::HdrType::FTP_REASON): | |
92ae4c86 AR |
1128 | reply->sline.reason(); |
1129 | ||
4391cd15 | 1130 | mb.appendf("%i %s\r\n", scode, reason); // error terminating line |
92ae4c86 AR |
1131 | |
1132 | // TODO: errorpage.cc should detect FTP client and use | |
1133 | // configurable FTP-friendly error templates which we should | |
1134 | // write to the client "as is" instead of hiding most of the info | |
1135 | ||
1136 | writeReply(mb); | |
1137 | } | |
1138 | ||
1139 | /// writes FTP response based on HTTP reply that is not an FTP-response wrapper | |
eacfca83 | 1140 | /// for example, internally-generated Squid "errorpages" end up here (for now) |
92ae4c86 AR |
1141 | void |
1142 | Ftp::Server::writeForwardedForeign(const HttpReply *reply) | |
1143 | { | |
1144 | changeState(fssConnected, "foreign reply"); | |
1145 | closeDataConnection(); | |
1146 | // 451: We intend to keep the control connection open. | |
1147 | writeErrorReply(reply, 451); | |
1148 | } | |
1149 | ||
1150 | void | |
84540b47 | 1151 | Ftp::Server::writeControlMsgAndCall(HttpReply *reply, AsyncCall::Pointer &call) |
92ae4c86 AR |
1152 | { |
1153 | // the caller guarantees that we are dealing with the current context only | |
789217a2 | 1154 | // the caller should also make sure reply->header.has(Http::HdrType::FTP_STATUS) |
92ae4c86 AR |
1155 | writeForwardedReplyAndCall(reply, call); |
1156 | } | |
1157 | ||
1158 | void | |
1159 | Ftp::Server::writeForwardedReplyAndCall(const HttpReply *reply, AsyncCall::Pointer &call) | |
1160 | { | |
1161 | assert(reply != NULL); | |
1162 | const HttpHeader &header = reply->header; | |
1163 | ||
1164 | // without status, the caller must use the writeForwardedForeign() path | |
789217a2 FC |
1165 | Must(header.has(Http::HdrType::FTP_STATUS)); |
1166 | Must(header.has(Http::HdrType::FTP_REASON)); | |
1167 | const int scode = header.getInt(Http::HdrType::FTP_STATUS); | |
e7ce227f | 1168 | debugs(33, 7, "scode: " << scode); |
92ae4c86 AR |
1169 | |
1170 | // Status 125 or 150 implies upload or data request, but we still check | |
1171 | // the state in case the server is buggy. | |
1172 | if ((scode == 125 || scode == 150) && | |
aea65fec AR |
1173 | (master->serverState == fssHandleUploadRequest || |
1174 | master->serverState == fssHandleDataRequest)) { | |
92ae4c86 AR |
1175 | if (checkDataConnPost()) { |
1176 | // If the data connection is ready, start reading data (here) | |
1177 | // and forward the response to client (further below). | |
1178 | debugs(33, 7, "data connection established, start data transfer"); | |
aea65fec | 1179 | if (master->serverState == fssHandleUploadRequest) |
92ae4c86 AR |
1180 | maybeReadUploadData(); |
1181 | } else { | |
1182 | // If we are waiting to accept the data connection, keep waiting. | |
1183 | if (Comm::IsConnOpen(dataListenConn)) { | |
1184 | debugs(33, 7, "wait for the client to establish a data connection"); | |
1185 | onDataAcceptCall = call; | |
1186 | // TODO: Add connect timeout for passive connections listener? | |
1187 | // TODO: Remember server response so that we can forward it? | |
1188 | } else { | |
1189 | // Either the connection was establised and closed after the | |
1190 | // data was transferred OR we failed to establish an active | |
1191 | // data connection and already sent the error to the client. | |
1192 | // In either case, there is nothing more to do. | |
1193 | debugs(33, 7, "done with data OR active connection failed"); | |
1194 | } | |
1195 | return; | |
1196 | } | |
1197 | } | |
1198 | ||
1199 | MemBuf mb; | |
1200 | mb.init(); | |
1201 | Ftp::PrintReply(mb, reply); | |
1202 | ||
aea65fec AR |
1203 | debugs(9, 2, "FTP Client " << clientConnection); |
1204 | debugs(9, 2, "FTP Client REPLY:\n---------\n" << mb.buf << | |
92ae4c86 AR |
1205 | "\n----------"); |
1206 | ||
1207 | Comm::Write(clientConnection, &mb, call); | |
1208 | } | |
1209 | ||
1210 | static void | |
ced8def3 | 1211 | Ftp::PrintReply(MemBuf &mb, const HttpReply *reply, const char *const) |
92ae4c86 AR |
1212 | { |
1213 | const HttpHeader &header = reply->header; | |
1214 | ||
1215 | HttpHeaderPos pos = HttpHeaderInitPos; | |
1216 | while (const HttpHeaderEntry *e = header.getEntry(&pos)) { | |
789217a2 | 1217 | if (e->id == Http::HdrType::FTP_PRE) { |
92ae4c86 AR |
1218 | String raw; |
1219 | if (httpHeaderParseQuotedString(e->value.rawBuf(), e->value.size(), &raw)) | |
4391cd15 | 1220 | mb.appendf("%s\r\n", raw.termedBuf()); |
92ae4c86 AR |
1221 | } |
1222 | } | |
1223 | ||
789217a2 FC |
1224 | if (header.has(Http::HdrType::FTP_STATUS)) { |
1225 | const char *reason = header.getStr(Http::HdrType::FTP_REASON); | |
1226 | mb.appendf("%i %s\r\n", header.getInt(Http::HdrType::FTP_STATUS), | |
f680026f | 1227 | (reason ? reason : 0)); |
92ae4c86 AR |
1228 | } |
1229 | } | |
1230 | ||
1231 | void | |
1232 | Ftp::Server::wroteEarlyReply(const CommIoCbParams &io) | |
1233 | { | |
1234 | if (io.flag == Comm::ERR_CLOSING) | |
1235 | return; | |
1236 | ||
1237 | if (io.flag != Comm::OK) { | |
1238 | debugs(33, 3, "FTP reply writing failed: " << xstrerr(io.xerrno)); | |
1239 | io.conn->close(); | |
1240 | return; | |
1241 | } | |
1242 | ||
d3dddfb5 | 1243 | Http::StreamPointer context = pipeline.front(); |
efd5e784 | 1244 | if (context != nullptr && context->http) { |
92ae4c86 AR |
1245 | context->http->out.size += io.size; |
1246 | context->http->out.headers_sz += io.size; | |
1247 | } | |
1248 | ||
1249 | flags.readMore = true; | |
1250 | readSomeData(); | |
1251 | } | |
1252 | ||
1253 | void | |
1254 | Ftp::Server::wroteReply(const CommIoCbParams &io) | |
1255 | { | |
1256 | if (io.flag == Comm::ERR_CLOSING) | |
1257 | return; | |
1258 | ||
1259 | if (io.flag != Comm::OK) { | |
1260 | debugs(33, 3, "FTP reply writing failed: " << xstrerr(io.xerrno)); | |
1261 | io.conn->close(); | |
1262 | return; | |
1263 | } | |
1264 | ||
d3dddfb5 | 1265 | Http::StreamPointer context = pipeline.front(); |
92ae4c86 AR |
1266 | assert(context->http); |
1267 | context->http->out.size += io.size; | |
1268 | context->http->out.headers_sz += io.size; | |
1269 | ||
aea65fec | 1270 | if (master->serverState == fssError) { |
92ae4c86 AR |
1271 | debugs(33, 5, "closing on FTP server error"); |
1272 | io.conn->close(); | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | const clientStream_status_t socketState = context->socketState(); | |
1277 | debugs(33, 5, "FTP client stream state " << socketState); | |
1278 | switch (socketState) { | |
1279 | case STREAM_UNPLANNED_COMPLETE: | |
1280 | case STREAM_FAILED: | |
27c841f6 AR |
1281 | io.conn->close(); |
1282 | return; | |
92ae4c86 AR |
1283 | |
1284 | case STREAM_NONE: | |
1285 | case STREAM_COMPLETE: | |
1286 | flags.readMore = true; | |
1287 | changeState(fssConnected, "Ftp::Server::wroteReply"); | |
fcc444e3 | 1288 | if (bodyParser) |
92ae4c86 | 1289 | finishDechunkingRequest(false); |
d20f59e2 | 1290 | context->finished(); |
cb7fa5cf | 1291 | kick(); |
92ae4c86 AR |
1292 | return; |
1293 | } | |
1294 | } | |
1295 | ||
1296 | bool | |
eacfca83 | 1297 | Ftp::Server::handleRequest(HttpRequest *request) |
27c841f6 | 1298 | { |
eacfca83 | 1299 | debugs(33, 9, request); |
92ae4c86 AR |
1300 | Must(request); |
1301 | ||
eacfca83 | 1302 | HttpHeader &header = request->header; |
789217a2 FC |
1303 | Must(header.has(Http::HdrType::FTP_COMMAND)); |
1304 | String &cmd = header.findEntry(Http::HdrType::FTP_COMMAND)->value; | |
1305 | Must(header.has(Http::HdrType::FTP_ARGUMENTS)); | |
1306 | String ¶ms = header.findEntry(Http::HdrType::FTP_ARGUMENTS)->value; | |
eacfca83 | 1307 | |
014adac1 | 1308 | if (Debug::Enabled(9, 2)) { |
92ae4c86 | 1309 | MemBuf mb; |
92ae4c86 | 1310 | mb.init(); |
10201568 | 1311 | request->pack(&mb); |
92ae4c86 | 1312 | |
aea65fec AR |
1313 | debugs(9, 2, "FTP Client " << clientConnection); |
1314 | debugs(9, 2, "FTP Client REQUEST:\n---------\n" << mb.buf << | |
92ae4c86 AR |
1315 | "\n----------"); |
1316 | } | |
1317 | ||
1ab04517 AR |
1318 | // TODO: When HttpHeader uses SBuf, change keys to SBuf |
1319 | typedef std::map<const std::string, RequestHandler> RequestHandlers; | |
1320 | static RequestHandlers handlers; | |
1321 | if (!handlers.size()) { | |
1322 | handlers["LIST"] = &Ftp::Server::handleDataRequest; | |
1323 | handlers["NLST"] = &Ftp::Server::handleDataRequest; | |
1324 | handlers["MLSD"] = &Ftp::Server::handleDataRequest; | |
1325 | handlers["FEAT"] = &Ftp::Server::handleFeatRequest; | |
1326 | handlers["PASV"] = &Ftp::Server::handlePasvRequest; | |
1327 | handlers["PORT"] = &Ftp::Server::handlePortRequest; | |
1328 | handlers["RETR"] = &Ftp::Server::handleDataRequest; | |
1329 | handlers["EPRT"] = &Ftp::Server::handleEprtRequest; | |
1330 | handlers["EPSV"] = &Ftp::Server::handleEpsvRequest; | |
1331 | handlers["CWD"] = &Ftp::Server::handleCwdRequest; | |
1332 | handlers["PASS"] = &Ftp::Server::handlePassRequest; | |
1333 | handlers["CDUP"] = &Ftp::Server::handleCdupRequest; | |
1334 | } | |
92ae4c86 AR |
1335 | |
1336 | RequestHandler handler = NULL; | |
1337 | if (request->method == Http::METHOD_PUT) | |
1338 | handler = &Ftp::Server::handleUploadRequest; | |
1339 | else { | |
1ab04517 AR |
1340 | const RequestHandlers::const_iterator hi = handlers.find(cmd.termedBuf()); |
1341 | if (hi != handlers.end()) | |
1342 | handler = hi->second; | |
92ae4c86 AR |
1343 | } |
1344 | ||
1ab04517 | 1345 | if (!handler) { |
aea65fec | 1346 | debugs(9, 7, "forwarding " << cmd << " as is, no post-processing"); |
1ab04517 AR |
1347 | return true; |
1348 | } | |
1349 | ||
1350 | return (this->*handler)(cmd, params); | |
92ae4c86 AR |
1351 | } |
1352 | ||
1353 | /// Called to parse USER command, which is required to create an HTTP request | |
eacfca83 | 1354 | /// wrapper. W/o request, the errors are handled by returning earlyError(). |
d3dddfb5 | 1355 | Http::Stream * |
ced8def3 | 1356 | Ftp::Server::handleUserRequest(const SBuf &, SBuf ¶ms) |
92ae4c86 | 1357 | { |
eacfca83 | 1358 | if (params.isEmpty()) |
3aab028c | 1359 | return earlyError(EarlyErrorKind::MissingUsername); |
92ae4c86 | 1360 | |
e7ce227f | 1361 | // find the [end of] user name |
1ab04517 | 1362 | const SBuf::size_type eou = params.rfind('@'); |
eacfca83 | 1363 | if (eou == SBuf::npos || eou + 1 >= params.length()) |
3aab028c | 1364 | return earlyError(EarlyErrorKind::MissingHost); |
92ae4c86 | 1365 | |
e7ce227f | 1366 | // Determine the intended destination. |
1ab04517 | 1367 | host = params.substr(eou + 1, params.length()); |
92ae4c86 AR |
1368 | // If we can parse it as raw IPv6 address, then surround with "[]". |
1369 | // Otherwise (domain, IPv4, [bracketed] IPv6, garbage, etc), use as is. | |
1ab04517 AR |
1370 | if (host.find(':') != SBuf::npos) { |
1371 | const Ip::Address ipa(host.c_str()); | |
92ae4c86 | 1372 | if (!ipa.isAnyAddr()) { |
1ab04517 | 1373 | char ipBuf[MAX_IPSTRLEN]; |
92ae4c86 AR |
1374 | ipa.toHostStr(ipBuf, MAX_IPSTRLEN); |
1375 | host = ipBuf; | |
1376 | } | |
1377 | } | |
1378 | ||
1ab04517 AR |
1379 | // const SBuf login = params.substr(0, eou); |
1380 | params.chop(0, eou); // leave just the login part for the peer | |
1381 | ||
1382 | SBuf oldUri; | |
aea65fec | 1383 | if (master->clientReadGreeting) |
92ae4c86 AR |
1384 | oldUri = uri; |
1385 | ||
aea65fec | 1386 | master->workingDir.clear(); |
1ab04517 | 1387 | calcUri(NULL); |
92ae4c86 | 1388 | |
aea65fec AR |
1389 | if (!master->clientReadGreeting) { |
1390 | debugs(9, 3, "set URI to " << uri); | |
92ae4c86 | 1391 | } else if (oldUri.caseCmp(uri) == 0) { |
aea65fec | 1392 | debugs(9, 5, "kept URI as " << oldUri); |
92ae4c86 | 1393 | } else { |
aea65fec | 1394 | debugs(9, 3, "reset URI from " << oldUri << " to " << uri); |
92ae4c86 | 1395 | closeDataConnection(); |
92ae4c86 | 1396 | unpinConnection(true); // close control connection to peer |
e7ce227f | 1397 | resetLogin("URI reset"); |
92ae4c86 AR |
1398 | } |
1399 | ||
eacfca83 | 1400 | return NULL; // no early errors |
92ae4c86 AR |
1401 | } |
1402 | ||
1403 | bool | |
ced8def3 | 1404 | Ftp::Server::handleFeatRequest(String &, String &) |
92ae4c86 | 1405 | { |
e7ce227f | 1406 | changeState(fssHandleFeat, "handleFeatRequest"); |
92ae4c86 AR |
1407 | return true; |
1408 | } | |
1409 | ||
1410 | bool | |
ced8def3 | 1411 | Ftp::Server::handlePasvRequest(String &, String ¶ms) |
92ae4c86 AR |
1412 | { |
1413 | if (gotEpsvAll) { | |
1414 | setReply(500, "Bad PASV command"); | |
1415 | return false; | |
1416 | } | |
1417 | ||
1418 | if (params.size() > 0) { | |
1419 | setReply(501, "Unexpected parameter"); | |
1420 | return false; | |
1421 | } | |
1422 | ||
e7ce227f | 1423 | changeState(fssHandlePasv, "handlePasvRequest"); |
92ae4c86 AR |
1424 | // no need to fake PASV request via setDataCommand() in true PASV case |
1425 | return true; | |
1426 | } | |
1427 | ||
1428 | /// [Re]initializes dataConn for active data transfers. Does not connect. | |
1429 | bool | |
1430 | Ftp::Server::createDataConnection(Ip::Address cltAddr) | |
1431 | { | |
1432 | assert(clientConnection != NULL); | |
1433 | assert(!clientConnection->remote.isAnyAddr()); | |
1434 | ||
1435 | if (cltAddr != clientConnection->remote) { | |
1436 | debugs(33, 2, "rogue PORT " << cltAddr << " request? ctrl: " << clientConnection->remote); | |
1437 | // Closing the control connection would not help with attacks because | |
1438 | // the client is evidently able to connect to us. Besides, closing | |
1439 | // makes retrials easier for the client and more damaging to us. | |
1440 | setReply(501, "Prohibited parameter value"); | |
1441 | return false; | |
1442 | } | |
1443 | ||
1444 | closeDataConnection(); | |
1445 | ||
1446 | Comm::ConnectionPointer conn = new Comm::Connection(); | |
aea65fec | 1447 | conn->flags |= COMM_DOBIND; |
92ae4c86 AR |
1448 | |
1449 | // Use local IP address of the control connection as the source address | |
1450 | // of the active data connection, or some clients will refuse to accept. | |
aea65fec | 1451 | conn->setAddrs(clientConnection->local, cltAddr); |
92ae4c86 AR |
1452 | // RFC 959 requires active FTP connections to originate from port 20 |
1453 | // but that would preclude us from supporting concurrent transfers! (XXX?) | |
1454 | conn->local.port(0); | |
1455 | ||
aea65fec | 1456 | debugs(9, 3, "will actively connect from " << conn->local << " to " << |
92ae4c86 AR |
1457 | conn->remote); |
1458 | ||
1459 | dataConn = conn; | |
1460 | uploadAvailSize = 0; | |
1461 | return true; | |
1462 | } | |
1463 | ||
1464 | bool | |
ced8def3 | 1465 | Ftp::Server::handlePortRequest(String &, String ¶ms) |
92ae4c86 AR |
1466 | { |
1467 | // TODO: Should PORT errors trigger closeDataConnection() cleanup? | |
1468 | ||
1469 | if (gotEpsvAll) { | |
1470 | setReply(500, "Rejecting PORT after EPSV ALL"); | |
1471 | return false; | |
1472 | } | |
1473 | ||
1474 | if (!params.size()) { | |
1475 | setReply(501, "Missing parameter"); | |
1476 | return false; | |
1477 | } | |
1478 | ||
1479 | Ip::Address cltAddr; | |
1480 | if (!Ftp::ParseIpPort(params.termedBuf(), NULL, cltAddr)) { | |
1481 | setReply(501, "Invalid parameter"); | |
1482 | return false; | |
1483 | } | |
1484 | ||
1485 | if (!createDataConnection(cltAddr)) | |
1486 | return false; | |
1487 | ||
e7ce227f | 1488 | changeState(fssHandlePort, "handlePortRequest"); |
92ae4c86 AR |
1489 | setDataCommand(); |
1490 | return true; // forward our fake PASV request | |
1491 | } | |
1492 | ||
1493 | bool | |
ced8def3 | 1494 | Ftp::Server::handleDataRequest(String &, String &) |
92ae4c86 AR |
1495 | { |
1496 | if (!checkDataConnPre()) | |
1497 | return false; | |
1498 | ||
92cfc72f | 1499 | master->userDataDone = 0; |
3238b9b6 | 1500 | originDataDownloadAbortedOnError = false; |
92cfc72f | 1501 | |
e7ce227f | 1502 | changeState(fssHandleDataRequest, "handleDataRequest"); |
92ae4c86 AR |
1503 | |
1504 | return true; | |
1505 | } | |
1506 | ||
1507 | bool | |
ced8def3 | 1508 | Ftp::Server::handleUploadRequest(String &, String &) |
92ae4c86 AR |
1509 | { |
1510 | if (!checkDataConnPre()) | |
1511 | return false; | |
1512 | ||
ec69bdb2 | 1513 | if (Config.accessList.forceRequestBodyContinuation) { |
efd5e784 | 1514 | ClientHttpRequest *http = pipeline.front()->http; |
ec69bdb2 CT |
1515 | HttpRequest *request = http->request; |
1516 | ACLFilledChecklist bodyContinuationCheck(Config.accessList.forceRequestBodyContinuation, request, NULL); | |
1517 | if (bodyContinuationCheck.fastCheck() == ACCESS_ALLOWED) { | |
1518 | request->forcedBodyContinuation = true; | |
1519 | if (checkDataConnPost()) { | |
1520 | // Write control Msg | |
1521 | writeEarlyReply(150, "Data connection opened"); | |
1522 | maybeReadUploadData(); | |
1523 | } else { | |
1524 | // wait for acceptDataConnection but tell it to call wroteEarlyReply | |
1525 | // after writing "150 Data connection opened" | |
1526 | typedef CommCbMemFunT<Server, CommIoCbParams> Dialer; | |
1527 | AsyncCall::Pointer call = JobCallback(33, 5, Dialer, this, Ftp::Server::wroteEarlyReply); | |
1528 | onDataAcceptCall = call; | |
1529 | } | |
1530 | } | |
1531 | } | |
1532 | ||
e7ce227f | 1533 | changeState(fssHandleUploadRequest, "handleDataRequest"); |
92ae4c86 AR |
1534 | |
1535 | return true; | |
1536 | } | |
1537 | ||
1538 | bool | |
ced8def3 | 1539 | Ftp::Server::handleEprtRequest(String &, String ¶ms) |
92ae4c86 | 1540 | { |
aea65fec | 1541 | debugs(9, 3, "Process an EPRT " << params); |
92ae4c86 AR |
1542 | |
1543 | if (gotEpsvAll) { | |
1544 | setReply(500, "Rejecting EPRT after EPSV ALL"); | |
1545 | return false; | |
1546 | } | |
1547 | ||
1548 | if (!params.size()) { | |
1549 | setReply(501, "Missing parameter"); | |
1550 | return false; | |
1551 | } | |
1552 | ||
1553 | Ip::Address cltAddr; | |
1554 | if (!Ftp::ParseProtoIpPort(params.termedBuf(), cltAddr)) { | |
1555 | setReply(501, "Invalid parameter"); | |
1556 | return false; | |
1557 | } | |
1558 | ||
1559 | if (!createDataConnection(cltAddr)) | |
1560 | return false; | |
1561 | ||
e7ce227f | 1562 | changeState(fssHandleEprt, "handleEprtRequest"); |
92ae4c86 AR |
1563 | setDataCommand(); |
1564 | return true; // forward our fake PASV request | |
1565 | } | |
1566 | ||
1567 | bool | |
ced8def3 | 1568 | Ftp::Server::handleEpsvRequest(String &, String ¶ms) |
92ae4c86 | 1569 | { |
aea65fec | 1570 | debugs(9, 3, "Process an EPSV command with params: " << params); |
92ae4c86 AR |
1571 | if (params.size() <= 0) { |
1572 | // treat parameterless EPSV as "use the protocol of the ctrl conn" | |
1573 | } else if (params.caseCmp("ALL") == 0) { | |
1574 | setReply(200, "EPSV ALL ok"); | |
1575 | gotEpsvAll = true; | |
1576 | return false; | |
1577 | } else if (params.cmp("2") == 0) { | |
1578 | if (!Ip::EnableIpv6) { | |
1579 | setReply(522, "Network protocol not supported, use (1)"); | |
1580 | return false; | |
1581 | } | |
1582 | } else if (params.cmp("1") != 0) { | |
1583 | setReply(501, "Unsupported EPSV parameter"); | |
1584 | return false; | |
1585 | } | |
1586 | ||
e7ce227f | 1587 | changeState(fssHandleEpsv, "handleEpsvRequest"); |
92ae4c86 AR |
1588 | setDataCommand(); |
1589 | return true; // forward our fake PASV request | |
1590 | } | |
1591 | ||
1592 | bool | |
ced8def3 | 1593 | Ftp::Server::handleCwdRequest(String &, String &) |
92ae4c86 | 1594 | { |
e7ce227f | 1595 | changeState(fssHandleCwd, "handleCwdRequest"); |
92ae4c86 AR |
1596 | return true; |
1597 | } | |
1598 | ||
1599 | bool | |
ced8def3 | 1600 | Ftp::Server::handlePassRequest(String &, String &) |
92ae4c86 | 1601 | { |
e7ce227f | 1602 | changeState(fssHandlePass, "handlePassRequest"); |
92ae4c86 AR |
1603 | return true; |
1604 | } | |
1605 | ||
1606 | bool | |
ced8def3 | 1607 | Ftp::Server::handleCdupRequest(String &, String &) |
92ae4c86 | 1608 | { |
e7ce227f | 1609 | changeState(fssHandleCdup, "handleCdupRequest"); |
92ae4c86 AR |
1610 | return true; |
1611 | } | |
1612 | ||
1613 | // Convert user PORT, EPRT, PASV, or EPSV data command to Squid PASV command. | |
1614 | // Squid FTP client decides what data command to use with peers. | |
1615 | void | |
1616 | Ftp::Server::setDataCommand() | |
1617 | { | |
efd5e784 | 1618 | ClientHttpRequest *const http = pipeline.front()->http; |
92ae4c86 AR |
1619 | assert(http != NULL); |
1620 | HttpRequest *const request = http->request; | |
1621 | assert(request != NULL); | |
1622 | HttpHeader &header = request->header; | |
789217a2 FC |
1623 | header.delById(Http::HdrType::FTP_COMMAND); |
1624 | header.putStr(Http::HdrType::FTP_COMMAND, "PASV"); | |
1625 | header.delById(Http::HdrType::FTP_ARGUMENTS); | |
1626 | header.putStr(Http::HdrType::FTP_ARGUMENTS, ""); | |
aea65fec | 1627 | debugs(9, 5, "client data command converted to fake PASV"); |
92ae4c86 AR |
1628 | } |
1629 | ||
1630 | /// check that client data connection is ready for future I/O or at least | |
1631 | /// has a chance of becoming ready soon. | |
1632 | bool | |
1633 | Ftp::Server::checkDataConnPre() | |
1634 | { | |
1635 | if (Comm::IsConnOpen(dataConn)) | |
1636 | return true; | |
1637 | ||
1638 | if (Comm::IsConnOpen(dataListenConn)) { | |
1639 | // We are still waiting for a client to connect to us after PASV. | |
1640 | // Perhaps client's data conn handshake has not reached us yet. | |
1641 | // After we talk to the server, checkDataConnPost() will recheck. | |
1642 | debugs(33, 3, "expecting clt data conn " << dataListenConn); | |
1643 | return true; | |
1644 | } | |
1645 | ||
1646 | if (!dataConn || dataConn->remote.isAnyAddr()) { | |
1647 | debugs(33, 5, "missing " << dataConn); | |
1648 | // TODO: use client address and default port instead. | |
1649 | setReply(425, "Use PORT or PASV first"); | |
1650 | return false; | |
1651 | } | |
1652 | ||
1653 | // active transfer: open a data connection from Squid to client | |
1654 | typedef CommCbMemFunT<Server, CommConnectCbParams> Dialer; | |
1655 | connector = JobCallback(17, 3, Dialer, this, Ftp::Server::connectedForData); | |
1656 | Comm::ConnOpener *cs = new Comm::ConnOpener(dataConn, connector, | |
27c841f6 | 1657 | Config.Timeout.connect); |
92ae4c86 AR |
1658 | AsyncJob::Start(cs); |
1659 | return false; // ConnStateData::processFtpRequest waits handleConnectDone | |
1660 | } | |
1661 | ||
1662 | /// Check that client data connection is ready for immediate I/O. | |
1663 | bool | |
1664 | Ftp::Server::checkDataConnPost() const | |
1665 | { | |
1666 | if (!Comm::IsConnOpen(dataConn)) { | |
1667 | debugs(33, 3, "missing client data conn: " << dataConn); | |
1668 | return false; | |
1669 | } | |
1670 | return true; | |
1671 | } | |
1672 | ||
1673 | /// Done establishing a data connection to the user. | |
1674 | void | |
1675 | Ftp::Server::connectedForData(const CommConnectCbParams ¶ms) | |
1676 | { | |
1677 | connector = NULL; | |
1678 | ||
1679 | if (params.flag != Comm::OK) { | |
1680 | /* it might have been a timeout with a partially open link */ | |
1681 | if (params.conn != NULL) | |
1682 | params.conn->close(); | |
1683 | setReply(425, "Cannot open data connection."); | |
d3dddfb5 | 1684 | Http::StreamPointer context = pipeline.front(); |
92ae4c86 AR |
1685 | Must(context->http); |
1686 | Must(context->http->storeEntry() != NULL); | |
1687 | } else { | |
1688 | Must(dataConn == params.conn); | |
1689 | Must(Comm::IsConnOpen(params.conn)); | |
1690 | fd_note(params.conn->fd, "active client ftp data"); | |
1691 | } | |
1692 | ||
1693 | doProcessRequest(); | |
1694 | } | |
1695 | ||
1696 | void | |
1697 | Ftp::Server::setReply(const int code, const char *msg) | |
1698 | { | |
d3dddfb5 | 1699 | Http::StreamPointer context = pipeline.front(); |
92ae4c86 AR |
1700 | ClientHttpRequest *const http = context->http; |
1701 | assert(http != NULL); | |
1702 | assert(http->storeEntry() == NULL); | |
1703 | ||
43446566 | 1704 | HttpReply *const reply = Ftp::HttpReplyWrapper(code, msg, Http::scNoContent, 0); |
92ae4c86 AR |
1705 | |
1706 | setLogUri(http, urlCanonicalClean(http->request)); | |
1707 | ||
1708 | clientStreamNode *const node = context->getClientReplyContext(); | |
1709 | clientReplyContext *const repContext = | |
1710 | dynamic_cast<clientReplyContext *>(node->data.getRaw()); | |
1711 | assert(repContext != NULL); | |
1712 | ||
1713 | RequestFlags reqFlags; | |
1714 | reqFlags.cachable = false; // force releaseRequest() in storeCreateEntry() | |
1715 | reqFlags.noCache = true; | |
1716 | repContext->createStoreEntry(http->request->method, reqFlags); | |
1717 | http->storeEntry()->replaceHttpReply(reply); | |
1718 | } | |
1719 | ||
0d253dfa CT |
1720 | void |
1721 | Ftp::Server::callException(const std::exception &e) | |
1722 | { | |
1723 | debugs(33, 2, "FTP::Server job caught: " << e.what()); | |
1724 | closeDataConnection(); | |
1725 | unpinConnection(true); | |
1726 | if (Comm::IsConnOpen(clientConnection)) | |
1727 | clientConnection->close(); | |
1728 | AsyncJob::callException(e); | |
1729 | } | |
1730 | ||
92cfc72f | 1731 | void |
3238b9b6 | 1732 | Ftp::Server::startWaitingForOrigin() |
92cfc72f | 1733 | { |
3238b9b6 CT |
1734 | debugs(33, 5, "waiting for Ftp::Client data transfer to end"); |
1735 | waitingForOrigin = true; | |
1736 | } | |
1737 | ||
1738 | void | |
1739 | Ftp::Server::stopWaitingForOrigin(int originStatus) | |
1740 | { | |
1741 | Must(waitingForOrigin); | |
1742 | waitingForOrigin = false; | |
1743 | ||
1744 | // if we have already decided how to respond, respond now | |
1745 | if (delayedReply) { | |
1746 | HttpReply::Pointer reply = delayedReply; | |
1747 | delayedReply = nullptr; | |
1748 | writeForwardedReply(reply.getRaw()); | |
1749 | return; // do not completeDataDownload() after an earlier response | |
92cfc72f CT |
1750 | } |
1751 | ||
3238b9b6 CT |
1752 | if (master->serverState != fssHandleDataRequest) |
1753 | return; | |
1754 | ||
1755 | // completeDataDownload() could be waitingForOrigin in fssHandleDataRequest | |
a8d1312d | 1756 | // Depending on which side has finished downloading first, either trust |
3238b9b6 CT |
1757 | // master->userDataDone status or set originDataDownloadAbortedOnError: |
1758 | if (master->userDataDone) { | |
1759 | // We finished downloading before Ftp::Client. Most likely, the | |
1760 | // adaptation shortened the origin response or we hit an error. | |
1761 | // Our status (stored in master->userDataDone) is more informative. | |
1762 | // Use master->userDataDone; avoid originDataDownloadAbortedOnError. | |
1763 | completeDataDownload(); | |
1764 | } else { | |
1765 | debugs(33, 5, "too early to write the response"); | |
1766 | // Ftp::Client naturally finished downloading before us. Set | |
1767 | // originDataDownloadAbortedOnError to overwrite future | |
1768 | // master->userDataDone and relay Ftp::Client error, if there was | |
1769 | // any, to the user. | |
1770 | originDataDownloadAbortedOnError = (originStatus >= 400); | |
1771 | } | |
92cfc72f CT |
1772 | } |
1773 | ||
1774 | void Ftp::Server::userDataCompletionCheckpoint(int finalStatusCode) | |
1775 | { | |
1776 | Must(!master->userDataDone); | |
1777 | master->userDataDone = finalStatusCode; | |
1778 | ||
1779 | if (bodyParser) | |
1780 | finishDechunkingRequest(false); | |
1781 | ||
3238b9b6 CT |
1782 | if (waitingForOrigin) { |
1783 | // The completeDataDownload() is not called here unconditionally | |
92cfc72f CT |
1784 | // because we want to signal the FTP user that we are not fully |
1785 | // done processing its data stream, even though all data bytes | |
1786 | // have been sent or received already. | |
3238b9b6 | 1787 | debugs(33, 5, "Transfering from FTP server is not complete"); |
92cfc72f CT |
1788 | return; |
1789 | } | |
1790 | ||
3238b9b6 CT |
1791 | // Adjust our reply if the server aborted with an error before we are done. |
1792 | if (master->userDataDone == 226 && originDataDownloadAbortedOnError) { | |
1793 | debugs(33, 5, "Transfering from FTP server terminated with an error, adjust status code"); | |
1794 | master->userDataDone = 451; | |
1795 | } | |
1796 | completeDataDownload(); | |
92cfc72f CT |
1797 | } |
1798 | ||
3238b9b6 | 1799 | void Ftp::Server::completeDataDownload() |
92cfc72f CT |
1800 | { |
1801 | writeCustomReply(master->userDataDone, master->userDataDone == 226 ? "Transfer complete" : "Server error; transfer aborted"); | |
1802 | closeDataConnection(); | |
1803 | } | |
1804 | ||
43446566 | 1805 | /// Whether Squid FTP Relay supports a named feature (e.g., a command). |
92ae4c86 | 1806 | static bool |
1ab04517 | 1807 | Ftp::SupportedCommand(const SBuf &name) |
92ae4c86 | 1808 | { |
1ab04517 | 1809 | static std::set<SBuf> BlackList; |
92ae4c86 | 1810 | if (BlackList.empty()) { |
43446566 | 1811 | /* Add FTP commands that Squid cannot relay correctly. */ |
92ae4c86 | 1812 | |
43446566 AR |
1813 | // We probably do not support AUTH TLS.* and AUTH SSL, |
1814 | // but let's disclaim all AUTH support to KISS, for now. | |
1ab04517 | 1815 | BlackList.insert(cmdAuth()); |
92ae4c86 AR |
1816 | } |
1817 | ||
1818 | // we claim support for all commands that we do not know about | |
1ab04517 | 1819 | return BlackList.find(name) == BlackList.end(); |
92ae4c86 AR |
1820 | } |
1821 |