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a23223bf | 1 | /* |
bde978a6 | 2 | * Copyright (C) 1996-2015 The Squid Software Foundation and contributors |
a23223bf | 3 | * |
bbc27441 AJ |
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. | |
a23223bf CT |
7 | */ |
8 | ||
bbc27441 AJ |
9 | /* DEBUG: section 17 Request Forwarding */ |
10 | ||
a23223bf CT |
11 | #include "squid.h" |
12 | #include "acl/FilledChecklist.h" | |
13 | #include "base/AsyncCbdataCalls.h" | |
14 | #include "CachePeer.h" | |
15 | #include "client_side.h" | |
16 | #include "comm/Loops.h" | |
17 | #include "errorpage.h" | |
18 | #include "fde.h" | |
19 | #include "globals.h" | |
24438ec5 | 20 | #include "helper/ResultCode.h" |
a23223bf CT |
21 | #include "HttpRequest.h" |
22 | #include "neighbors.h" | |
7f4e9b73 | 23 | #include "SquidConfig.h" |
31855516 | 24 | #include "ssl/bio.h" |
a23223bf CT |
25 | #include "ssl/cert_validate_message.h" |
26 | #include "ssl/Config.h" | |
27 | #include "ssl/ErrorDetail.h" | |
28 | #include "ssl/helper.h" | |
29 | #include "ssl/PeerConnector.h" | |
30 | #include "ssl/ServerBump.h" | |
31 | #include "ssl/support.h" | |
a23223bf CT |
32 | |
33 | CBDATA_NAMESPACED_CLASS_INIT(Ssl, PeerConnector); | |
1b091aec CT |
34 | CBDATA_NAMESPACED_CLASS_INIT(Ssl, BlindPeerConnector); |
35 | CBDATA_NAMESPACED_CLASS_INIT(Ssl, PeekingPeerConnector); | |
a23223bf | 36 | |
37611b26 | 37 | Ssl::PeerConnector::PeerConnector(const Comm::ConnectionPointer &aServerConn, AsyncCall::Pointer &aCallback, const time_t timeout) : |
f53969cc | 38 | AsyncJob("Ssl::PeerConnector"), |
f53969cc | 39 | serverConn(aServerConn), |
79fe57c2 | 40 | certErrors(NULL), |
f53969cc SM |
41 | callback(aCallback), |
42 | negotiationTimeout(timeout), | |
43 | startTime(squid_curtime), | |
1b091aec | 44 | useCertValidator_(false) |
a23223bf CT |
45 | { |
46 | // if this throws, the caller's cb dialer is not our CbDialer | |
47 | Must(dynamic_cast<CbDialer*>(callback->getDialer())); | |
48 | } | |
49 | ||
50 | Ssl::PeerConnector::~PeerConnector() | |
51 | { | |
1b091aec | 52 | cbdataReferenceDone(certErrors); |
a23223bf CT |
53 | debugs(83, 5, "Peer connector " << this << " gone"); |
54 | } | |
55 | ||
56 | bool Ssl::PeerConnector::doneAll() const | |
57 | { | |
58 | return (!callback || callback->canceled()) && AsyncJob::doneAll(); | |
59 | } | |
60 | ||
61 | /// Preps connection and SSL state. Calls negotiate(). | |
62 | void | |
63 | Ssl::PeerConnector::start() | |
64 | { | |
65 | AsyncJob::start(); | |
66 | ||
1b091aec | 67 | if (prepareSocket() && (initializeSsl() != NULL)) |
a23223bf | 68 | negotiateSsl(); |
a23223bf CT |
69 | } |
70 | ||
71 | void | |
72 | Ssl::PeerConnector::commCloseHandler(const CommCloseCbParams ¶ms) | |
73 | { | |
74 | debugs(83, 5, "FD " << params.fd << ", Ssl::PeerConnector=" << params.data); | |
75 | connectionClosed("Ssl::PeerConnector::commCloseHandler"); | |
76 | } | |
77 | ||
78 | void | |
79 | Ssl::PeerConnector::connectionClosed(const char *reason) | |
80 | { | |
81 | mustStop(reason); | |
82 | callback = NULL; | |
83 | } | |
84 | ||
85 | bool | |
86 | Ssl::PeerConnector::prepareSocket() | |
87 | { | |
88 | const int fd = serverConnection()->fd; | |
89 | if (!Comm::IsConnOpen(serverConn) || fd_table[serverConn->fd].closing()) { | |
90 | connectionClosed("Ssl::PeerConnector::prepareSocket"); | |
91 | return false; | |
92 | } | |
93 | ||
94 | // watch for external connection closures | |
95 | typedef CommCbMemFunT<Ssl::PeerConnector, CommCloseCbParams> Dialer; | |
96 | closeHandler = JobCallback(9, 5, Dialer, this, Ssl::PeerConnector::commCloseHandler); | |
97 | comm_add_close_handler(fd, closeHandler); | |
98 | return true; | |
99 | } | |
100 | ||
1b091aec | 101 | SSL * |
a23223bf CT |
102 | Ssl::PeerConnector::initializeSsl() |
103 | { | |
1b091aec | 104 | SSL_CTX *sslContext = getSslContext(); |
a23223bf CT |
105 | assert(sslContext); |
106 | ||
1b091aec CT |
107 | const int fd = serverConnection()->fd; |
108 | ||
31855516 CT |
109 | SSL *ssl = Ssl::CreateClient(sslContext, fd, "server https start"); |
110 | if (!ssl) { | |
a23223bf CT |
111 | ErrorState *anErr = new ErrorState(ERR_SOCKET_FAILURE, Http::scInternalServerError, request.getRaw()); |
112 | anErr->xerrno = errno; | |
113 | debugs(83, DBG_IMPORTANT, "Error allocating SSL handle: " << ERR_error_string(ERR_get_error(), NULL)); | |
76b64c80 | 114 | |
1b091aec CT |
115 | noteNegotiationDone(anErr); |
116 | bail(anErr); | |
117 | return NULL; | |
a23223bf CT |
118 | } |
119 | ||
120 | // If CertValidation Helper used do not lookup checklist for errors, | |
121 | // but keep a list of errors to send it to CertValidator | |
122 | if (!Ssl::TheConfig.ssl_crt_validator) { | |
123 | // Create the ACL check list now, while we have access to more info. | |
124 | // The list is used in ssl_verify_cb() and is freed in ssl_free(). | |
125 | if (acl_access *acl = ::Config.ssl_client.cert_error) { | |
126 | ACLFilledChecklist *check = new ACLFilledChecklist(acl, request.getRaw(), dash_str); | |
127 | // check->fd(fd); XXX: need client FD here | |
128 | SSL_set_ex_data(ssl, ssl_ex_index_cert_error_check, check); | |
129 | } | |
130 | } | |
1b091aec | 131 | return ssl; |
a23223bf CT |
132 | } |
133 | ||
8aec3e1b CT |
134 | void |
135 | Ssl::PeerConnector::setReadTimeout() | |
136 | { | |
137 | int timeToRead; | |
138 | if (negotiationTimeout) { | |
139 | const int timeUsed = squid_curtime - startTime; | |
140 | const int timeLeft = max(0, static_cast<int>(negotiationTimeout - timeUsed)); | |
141 | timeToRead = min(static_cast<int>(::Config.Timeout.read), timeLeft); | |
142 | } else | |
143 | timeToRead = ::Config.Timeout.read; | |
144 | AsyncCall::Pointer nil; | |
145 | commSetConnTimeout(serverConnection(), timeToRead, nil); | |
146 | } | |
147 | ||
a23223bf CT |
148 | void |
149 | Ssl::PeerConnector::negotiateSsl() | |
150 | { | |
151 | if (!Comm::IsConnOpen(serverConnection()) || fd_table[serverConnection()->fd].closing()) | |
152 | return; | |
153 | ||
154 | const int fd = serverConnection()->fd; | |
155 | SSL *ssl = fd_table[fd].ssl; | |
156 | const int result = SSL_connect(ssl); | |
157 | if (result <= 0) { | |
158 | handleNegotiateError(result); | |
159 | return; // we might be gone by now | |
160 | } | |
161 | ||
c91d4d4e CT |
162 | if (!sslFinalized()) |
163 | return; | |
164 | ||
165 | callBack(); | |
166 | } | |
167 | ||
168 | bool | |
169 | Ssl::PeerConnector::sslFinalized() | |
170 | { | |
1b091aec CT |
171 | if (Ssl::TheConfig.ssl_crt_validator && useCertValidator_) { |
172 | const int fd = serverConnection()->fd; | |
173 | SSL *ssl = fd_table[fd].ssl; | |
a23223bf | 174 | |
a23223bf CT |
175 | Ssl::CertValidationRequest validationRequest; |
176 | // WARNING: Currently we do not use any locking for any of the | |
177 | // members of the Ssl::CertValidationRequest class. In this code the | |
178 | // Ssl::CertValidationRequest object used only to pass data to | |
179 | // Ssl::CertValidationHelper::submit method. | |
180 | validationRequest.ssl = ssl; | |
5c51bffb | 181 | validationRequest.domainName = request->url.host(); |
a23223bf CT |
182 | if (Ssl::CertErrors *errs = static_cast<Ssl::CertErrors *>(SSL_get_ex_data(ssl, ssl_ex_index_ssl_errors))) |
183 | // validationRequest disappears on return so no need to cbdataReference | |
184 | validationRequest.errors = errs; | |
185 | else | |
186 | validationRequest.errors = NULL; | |
187 | try { | |
188 | debugs(83, 5, "Sending SSL certificate for validation to ssl_crtvd."); | |
189 | Ssl::CertValidationHelper::GetInstance()->sslSubmit(validationRequest, sslCrtvdHandleReplyWrapper, this); | |
c91d4d4e | 190 | return false; |
a23223bf CT |
191 | } catch (const std::exception &e) { |
192 | debugs(83, DBG_IMPORTANT, "ERROR: Failed to compose ssl_crtvd " << | |
193 | "request for " << validationRequest.domainName << | |
194 | " certificate: " << e.what() << "; will now block to " << | |
195 | "validate that certificate."); | |
196 | // fall through to do blocking in-process generation. | |
197 | ErrorState *anErr = new ErrorState(ERR_GATEWAY_FAILURE, Http::scInternalServerError, request.getRaw()); | |
1b091aec CT |
198 | |
199 | noteNegotiationDone(anErr); | |
a23223bf | 200 | bail(anErr); |
a23223bf | 201 | serverConn->close(); |
c91d4d4e | 202 | return true; |
a23223bf CT |
203 | } |
204 | } | |
1b091aec CT |
205 | |
206 | noteNegotiationDone(NULL); | |
c91d4d4e | 207 | return true; |
a23223bf CT |
208 | } |
209 | ||
c91d4d4e | 210 | void switchToTunnel(HttpRequest *request, Comm::ConnectionPointer & clientConn, Comm::ConnectionPointer &srvConn); |
7f4e9b73 | 211 | |
31855516 | 212 | void |
1b091aec | 213 | Ssl::PeekingPeerConnector::cbCheckForPeekAndSpliceDone(allow_t answer, void *data) |
7f4e9b73 | 214 | { |
1b091aec | 215 | Ssl::PeekingPeerConnector *peerConnect = (Ssl::PeekingPeerConnector *) data; |
566f8310 AR |
216 | // Use job calls to add done() checks and other job logic/protections. |
217 | CallJobHere1(83, 7, CbcPointer<PeekingPeerConnector>(peerConnect), Ssl::PeekingPeerConnector, checkForPeekAndSpliceDone, answer); | |
218 | } | |
219 | ||
220 | void | |
221 | Ssl::PeekingPeerConnector::checkForPeekAndSpliceDone(allow_t answer) | |
222 | { | |
223 | const Ssl::BumpMode finalAction = (answer.code == ACCESS_ALLOWED) ? | |
2d5fa7fa SM |
224 | static_cast<Ssl::BumpMode>(answer.kind): |
225 | checkForPeekAndSpliceGuess(); | |
566f8310 | 226 | checkForPeekAndSpliceMatched(finalAction); |
7f4e9b73 CT |
227 | } |
228 | ||
a9c2dd2f | 229 | void |
1b091aec | 230 | Ssl::PeekingPeerConnector::checkForPeekAndSplice() |
31855516 | 231 | { |
5d65362c CT |
232 | // Mark Step3 of bumping |
233 | if (request->clientConnectionManager.valid()) { | |
234 | if (Ssl::ServerBump *serverBump = request->clientConnectionManager->serverBump()) { | |
235 | serverBump->step = Ssl::bumpStep3; | |
236 | } | |
237 | } | |
238 | ||
69f69080 CT |
239 | handleServerCertificate(); |
240 | ||
a9c2dd2f CT |
241 | ACLFilledChecklist *acl_checklist = new ACLFilledChecklist( |
242 | ::Config.accessList.ssl_bump, | |
243 | request.getRaw(), NULL); | |
640fe8fb CT |
244 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpNone)); |
245 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpPeek)); | |
246 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpStare)); | |
247 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpClientFirst)); | |
248 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpServerFirst)); | |
249 | SSL *ssl = fd_table[serverConn->fd].ssl; | |
250 | BIO *b = SSL_get_rbio(ssl); | |
251 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
252 | if (!srvBio->canSplice()) | |
253 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpSplice)); | |
254 | if (!srvBio->canBump()) | |
255 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpBump)); | |
1b091aec | 256 | acl_checklist->nonBlockingCheck(Ssl::PeekingPeerConnector::cbCheckForPeekAndSpliceDone, this); |
a9c2dd2f | 257 | } |
789dda8d | 258 | |
a9c2dd2f | 259 | void |
566f8310 | 260 | Ssl::PeekingPeerConnector::checkForPeekAndSpliceMatched(const Ssl::BumpMode action) |
a9c2dd2f CT |
261 | { |
262 | SSL *ssl = fd_table[serverConn->fd].ssl; | |
31855516 CT |
263 | BIO *b = SSL_get_rbio(ssl); |
264 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
8693472e | 265 | debugs(83,5, "Will check for peek and splice on FD " << serverConn->fd); |
7f4e9b73 | 266 | |
a9c2dd2f | 267 | Ssl::BumpMode finalAction = action; |
640fe8fb | 268 | Must(finalAction == Ssl::bumpSplice || finalAction == Ssl::bumpBump || finalAction == Ssl::bumpTerminate); |
a9c2dd2f | 269 | // Record final decision |
68bd0182 | 270 | if (request->clientConnectionManager.valid()) { |
a9c2dd2f | 271 | request->clientConnectionManager->sslBumpMode = finalAction; |
68bd0182 CT |
272 | request->clientConnectionManager->serverBump()->act.step3 = finalAction; |
273 | } | |
a9c2dd2f CT |
274 | |
275 | if (finalAction == Ssl::bumpTerminate) { | |
b54a7c5a CT |
276 | serverConn->close(); |
277 | clientConn->close(); | |
a9c2dd2f | 278 | } else if (finalAction != Ssl::bumpSplice) { |
31855516 CT |
279 | //Allow write, proceed with the connection |
280 | srvBio->holdWrite(false); | |
281 | srvBio->recordInput(false); | |
8693472e | 282 | debugs(83,5, "Retry the fwdNegotiateSSL on FD " << serverConn->fd); |
1b091aec | 283 | Ssl::PeerConnector::noteWantWrite(); |
93ead3fd | 284 | } else { |
c91d4d4e | 285 | splice = true; |
f53969cc | 286 | // Ssl Negotiation stops here. Last SSL checks for valid certificates |
c91d4d4e | 287 | // and if done, switch to tunnel mode |
1b091aec CT |
288 | if (sslFinalized()) { |
289 | debugs(83,5, "Abort NegotiateSSL on FD " << serverConn->fd << " and splice the connection"); | |
290 | } | |
31855516 CT |
291 | } |
292 | } | |
293 | ||
566f8310 AR |
294 | Ssl::BumpMode |
295 | Ssl::PeekingPeerConnector::checkForPeekAndSpliceGuess() const | |
296 | { | |
297 | if (const ConnStateData *csd = request->clientConnectionManager.valid()) { | |
298 | const Ssl::BumpMode currentMode = csd->sslBumpMode; | |
299 | if (currentMode == Ssl::bumpStare) { | |
300 | debugs(83,5, "default to bumping after staring"); | |
301 | return Ssl::bumpBump; | |
302 | } | |
303 | debugs(83,5, "default to splicing after " << currentMode); | |
304 | } else { | |
305 | debugs(83,3, "default to splicing due to missing info"); | |
306 | } | |
307 | ||
308 | return Ssl::bumpSplice; | |
309 | } | |
310 | ||
a23223bf CT |
311 | void |
312 | Ssl::PeerConnector::sslCrtvdHandleReplyWrapper(void *data, Ssl::CertValidationResponse const &validationResponse) | |
313 | { | |
314 | Ssl::PeerConnector *connector = (Ssl::PeerConnector *)(data); | |
315 | connector->sslCrtvdHandleReply(validationResponse); | |
316 | } | |
317 | ||
318 | void | |
319 | Ssl::PeerConnector::sslCrtvdHandleReply(Ssl::CertValidationResponse const &validationResponse) | |
320 | { | |
321 | Ssl::CertErrors *errs = NULL; | |
322 | Ssl::ErrorDetail *errDetails = NULL; | |
323 | bool validatorFailed = false; | |
324 | if (!Comm::IsConnOpen(serverConnection())) { | |
325 | return; | |
326 | } | |
327 | ||
5c51bffb | 328 | debugs(83,5, request->url.host() << " cert validation result: " << validationResponse.resultCode); |
a23223bf | 329 | |
2428ce02 | 330 | if (validationResponse.resultCode == ::Helper::Error) |
a23223bf | 331 | errs = sslCrtvdCheckForErrors(validationResponse, errDetails); |
2428ce02 | 332 | else if (validationResponse.resultCode != ::Helper::Okay) |
a23223bf CT |
333 | validatorFailed = true; |
334 | ||
335 | if (!errDetails && !validatorFailed) { | |
1b091aec CT |
336 | noteNegotiationDone(NULL); |
337 | callBack(); | |
a23223bf CT |
338 | return; |
339 | } | |
340 | ||
1b091aec CT |
341 | if (errs) { |
342 | if (certErrors) | |
343 | cbdataReferenceDone(certErrors); | |
344 | certErrors = cbdataReference(errs); | |
345 | } | |
346 | ||
a23223bf CT |
347 | ErrorState *anErr = NULL; |
348 | if (validatorFailed) { | |
349 | anErr = new ErrorState(ERR_GATEWAY_FAILURE, Http::scInternalServerError, request.getRaw()); | |
350 | } else { | |
a23223bf CT |
351 | anErr = new ErrorState(ERR_SECURE_CONNECT_FAIL, Http::scServiceUnavailable, request.getRaw()); |
352 | anErr->detail = errDetails; | |
353 | /*anErr->xerrno= Should preserved*/ | |
354 | } | |
355 | ||
1b091aec | 356 | noteNegotiationDone(anErr); |
a23223bf | 357 | bail(anErr); |
a23223bf CT |
358 | serverConn->close(); |
359 | return; | |
360 | } | |
361 | ||
362 | /// Checks errors in the cert. validator response against sslproxy_cert_error. | |
363 | /// The first honored error, if any, is returned via errDetails parameter. | |
364 | /// The method returns all seen errors except SSL_ERROR_NONE as Ssl::CertErrors. | |
365 | Ssl::CertErrors * | |
366 | Ssl::PeerConnector::sslCrtvdCheckForErrors(Ssl::CertValidationResponse const &resp, Ssl::ErrorDetail *& errDetails) | |
367 | { | |
368 | Ssl::CertErrors *errs = NULL; | |
369 | ||
370 | ACLFilledChecklist *check = NULL; | |
371 | if (acl_access *acl = ::Config.ssl_client.cert_error) | |
372 | check = new ACLFilledChecklist(acl, request.getRaw(), dash_str); | |
373 | ||
374 | SSL *ssl = fd_table[serverConnection()->fd].ssl; | |
375 | typedef Ssl::CertValidationResponse::RecvdErrors::const_iterator SVCRECI; | |
376 | for (SVCRECI i = resp.errors.begin(); i != resp.errors.end(); ++i) { | |
377 | debugs(83, 7, "Error item: " << i->error_no << " " << i->error_reason); | |
378 | ||
379 | assert(i->error_no != SSL_ERROR_NONE); | |
380 | ||
381 | if (!errDetails) { | |
382 | bool allowed = false; | |
383 | if (check) { | |
384 | check->sslErrors = new Ssl::CertErrors(Ssl::CertError(i->error_no, i->cert.get())); | |
385 | if (check->fastCheck() == ACCESS_ALLOWED) | |
386 | allowed = true; | |
387 | } | |
388 | // else the Config.ssl_client.cert_error access list is not defined | |
389 | // and the first error will cause the error page | |
390 | ||
391 | if (allowed) { | |
392 | debugs(83, 3, "bypassing SSL error " << i->error_no << " in " << "buffer"); | |
393 | } else { | |
394 | debugs(83, 5, "confirming SSL error " << i->error_no); | |
395 | X509 *brokenCert = i->cert.get(); | |
f97700a0 | 396 | Security::CertPointer peerCert(SSL_get_peer_certificate(ssl)); |
a23223bf CT |
397 | const char *aReason = i->error_reason.empty() ? NULL : i->error_reason.c_str(); |
398 | errDetails = new Ssl::ErrorDetail(i->error_no, peerCert.get(), brokenCert, aReason); | |
399 | } | |
400 | if (check) { | |
401 | delete check->sslErrors; | |
402 | check->sslErrors = NULL; | |
403 | } | |
404 | } | |
405 | ||
406 | if (!errs) | |
407 | errs = new Ssl::CertErrors(Ssl::CertError(i->error_no, i->cert.get())); | |
408 | else | |
409 | errs->push_back_unique(Ssl::CertError(i->error_no, i->cert.get())); | |
410 | } | |
411 | if (check) | |
412 | delete check; | |
413 | ||
414 | return errs; | |
415 | } | |
416 | ||
417 | /// A wrapper for Comm::SetSelect() notifications. | |
418 | void | |
419 | Ssl::PeerConnector::NegotiateSsl(int, void *data) | |
420 | { | |
421 | PeerConnector *pc = static_cast<PeerConnector*>(data); | |
422 | // Use job calls to add done() checks and other job logic/protections. | |
423 | CallJobHere(83, 7, pc, Ssl::PeerConnector, negotiateSsl); | |
424 | } | |
425 | ||
426 | void | |
427 | Ssl::PeerConnector::handleNegotiateError(const int ret) | |
428 | { | |
429 | const int fd = serverConnection()->fd; | |
430 | unsigned long ssl_lib_error = SSL_ERROR_NONE; | |
431 | SSL *ssl = fd_table[fd].ssl; | |
f5518dca | 432 | const int ssl_error = SSL_get_error(ssl, ret); |
a23223bf | 433 | |
e2849af8 | 434 | switch (ssl_error) { |
e2849af8 | 435 | case SSL_ERROR_WANT_READ: |
1b091aec | 436 | noteWantRead(); |
e2849af8 | 437 | return; |
a23223bf | 438 | |
e2849af8 | 439 | case SSL_ERROR_WANT_WRITE: |
1b091aec | 440 | noteWantWrite(); |
e2849af8 | 441 | return; |
a23223bf | 442 | |
e2849af8 A |
443 | case SSL_ERROR_SSL: |
444 | case SSL_ERROR_SYSCALL: | |
445 | ssl_lib_error = ERR_get_error(); | |
1b091aec CT |
446 | // proceed to the general error handling code |
447 | break; | |
448 | default: | |
449 | // no special error handling for all other errors | |
450 | break; | |
451 | } | |
452 | noteSslNegotiationError(ret, ssl_error, ssl_lib_error); | |
453 | } | |
a23223bf | 454 | |
1b091aec CT |
455 | void |
456 | Ssl::PeerConnector::noteWantRead() | |
457 | { | |
458 | setReadTimeout(); | |
459 | const int fd = serverConnection()->fd; | |
460 | Comm::SetSelect(fd, COMM_SELECT_READ, &NegotiateSsl, this, 0); | |
461 | } | |
7f4e9b73 | 462 | |
1b091aec CT |
463 | void |
464 | Ssl::PeerConnector::noteWantWrite() | |
465 | { | |
466 | const int fd = serverConnection()->fd; | |
467 | Comm::SetSelect(fd, COMM_SELECT_WRITE, &NegotiateSsl, this, 0); | |
468 | return; | |
469 | } | |
a23223bf | 470 | |
1b091aec CT |
471 | void |
472 | Ssl::PeerConnector::noteSslNegotiationError(const int ret, const int ssl_error, const int ssl_lib_error) | |
473 | { | |
474 | #ifdef EPROTO | |
475 | int sysErrNo = EPROTO; | |
476 | #else | |
477 | int sysErrNo = EACCES; | |
478 | #endif | |
a23223bf | 479 | |
1b091aec CT |
480 | // store/report errno when ssl_error is SSL_ERROR_SYSCALL, ssl_lib_error is 0, and ret is -1 |
481 | if (ssl_error == SSL_ERROR_SYSCALL && ret == -1 && ssl_lib_error == 0) | |
482 | sysErrNo = errno; | |
a23223bf | 483 | |
1b091aec CT |
484 | const int fd = serverConnection()->fd; |
485 | debugs(83, DBG_IMPORTANT, "Error negotiating SSL on FD " << fd << | |
486 | ": " << ERR_error_string(ssl_lib_error, NULL) << " (" << | |
487 | ssl_error << "/" << ret << "/" << errno << ")"); | |
a23223bf | 488 | |
1b091aec CT |
489 | ErrorState *anErr = NULL; |
490 | if (request != NULL) | |
491 | anErr = ErrorState::NewForwarding(ERR_SECURE_CONNECT_FAIL, request.getRaw()); | |
492 | else | |
493 | anErr = new ErrorState(ERR_SECURE_CONNECT_FAIL, Http::scServiceUnavailable, NULL); | |
a23223bf CT |
494 | anErr->xerrno = sysErrNo; |
495 | ||
1b091aec | 496 | SSL *ssl = fd_table[fd].ssl; |
a23223bf CT |
497 | Ssl::ErrorDetail *errFromFailure = (Ssl::ErrorDetail *)SSL_get_ex_data(ssl, ssl_ex_index_ssl_error_detail); |
498 | if (errFromFailure != NULL) { | |
499 | // The errFromFailure is attached to the ssl object | |
500 | // and will be released when ssl object destroyed. | |
501 | // Copy errFromFailure to a new Ssl::ErrorDetail object | |
502 | anErr->detail = new Ssl::ErrorDetail(*errFromFailure); | |
503 | } else { | |
504 | // server_cert can be NULL here | |
505 | X509 *server_cert = SSL_get_peer_certificate(ssl); | |
506 | anErr->detail = new Ssl::ErrorDetail(SQUID_ERR_SSL_HANDSHAKE, server_cert, NULL); | |
507 | X509_free(server_cert); | |
508 | } | |
509 | ||
510 | if (ssl_lib_error != SSL_ERROR_NONE) | |
511 | anErr->detail->setLibError(ssl_lib_error); | |
512 | ||
1b091aec CT |
513 | assert(certErrors == NULL); |
514 | // remember validation errors, if any | |
515 | if (Ssl::CertErrors *errs = static_cast<Ssl::CertErrors*>(SSL_get_ex_data(ssl, ssl_ex_index_ssl_errors))) | |
516 | certErrors = cbdataReference(errs); | |
a23223bf | 517 | |
1b091aec | 518 | noteNegotiationDone(anErr); |
a23223bf CT |
519 | bail(anErr); |
520 | } | |
521 | ||
522 | void | |
523 | Ssl::PeerConnector::bail(ErrorState *error) | |
524 | { | |
525 | Must(error); // or the recepient will not know there was a problem | |
a23223bf CT |
526 | Must(callback != NULL); |
527 | CbDialer *dialer = dynamic_cast<CbDialer*>(callback->getDialer()); | |
528 | Must(dialer); | |
529 | dialer->answer().error = error; | |
530 | ||
531 | callBack(); | |
532 | // Our job is done. The callabck recepient will probably close the failed | |
533 | // peer connection and try another peer or go direct (if possible). We | |
534 | // can close the connection ourselves (our error notification would reach | |
535 | // the recepient before the fd-closure notification), but we would rather | |
536 | // minimize the number of fd-closure notifications and let the recepient | |
537 | // manage the TCP state of the connection. | |
538 | } | |
539 | ||
540 | void | |
541 | Ssl::PeerConnector::callBack() | |
542 | { | |
543 | AsyncCall::Pointer cb = callback; | |
544 | // Do this now so that if we throw below, swanSong() assert that we _tried_ | |
545 | // to call back holds. | |
546 | callback = NULL; // this should make done() true | |
547 | ||
548 | // remove close handler | |
549 | comm_remove_close_handler(serverConnection()->fd, closeHandler); | |
550 | ||
551 | CbDialer *dialer = dynamic_cast<CbDialer*>(cb->getDialer()); | |
552 | Must(dialer); | |
553 | dialer->answer().conn = serverConnection(); | |
554 | ScheduleCallHere(cb); | |
555 | } | |
556 | ||
a23223bf CT |
557 | void |
558 | Ssl::PeerConnector::swanSong() | |
559 | { | |
560 | // XXX: unregister fd-closure monitoring and CommSetSelect interest, if any | |
561 | AsyncJob::swanSong(); | |
566f8310 AR |
562 | if (callback != NULL) { // paranoid: we have left the caller waiting |
563 | debugs(83, DBG_IMPORTANT, "BUG: Unexpected state while connecting to a cache_peer or origin server"); | |
564 | ErrorState *anErr = new ErrorState(ERR_GATEWAY_FAILURE, Http::scInternalServerError, request.getRaw()); | |
565 | bail(anErr); | |
566 | assert(!callback); | |
567 | return; | |
568 | } | |
a23223bf CT |
569 | } |
570 | ||
571 | const char * | |
572 | Ssl::PeerConnector::status() const | |
573 | { | |
574 | static MemBuf buf; | |
575 | buf.reset(); | |
576 | ||
577 | // TODO: redesign AsyncJob::status() API to avoid this | |
578 | // id and stop reason reporting duplication. | |
579 | buf.append(" [", 2); | |
580 | if (stopReason != NULL) { | |
07e6d76e AJ |
581 | buf.append("Stopped, reason:", 16); |
582 | buf.appendf("%s",stopReason); | |
a23223bf CT |
583 | } |
584 | if (serverConn != NULL) | |
07e6d76e AJ |
585 | buf.appendf(" FD %d", serverConn->fd); |
586 | buf.appendf(" %s%u]", id.Prefix, id.value); | |
a23223bf CT |
587 | buf.terminate(); |
588 | ||
589 | return buf.content(); | |
590 | } | |
591 | ||
1b091aec CT |
592 | SSL_CTX * |
593 | Ssl::BlindPeerConnector::getSslContext() | |
594 | { | |
595 | if (const CachePeer *peer = serverConnection()->getPeer()) { | |
596 | assert(peer->secure.encryptTransport); | |
597 | SSL_CTX *sslContext = peer->sslContext; | |
598 | return sslContext; | |
599 | } | |
600 | return NULL; | |
601 | } | |
602 | ||
603 | SSL * | |
604 | Ssl::BlindPeerConnector::initializeSsl() | |
605 | { | |
606 | SSL *ssl = Ssl::PeerConnector::initializeSsl(); | |
607 | if (!ssl) | |
608 | return NULL; | |
609 | ||
610 | const CachePeer *peer = serverConnection()->getPeer(); | |
611 | assert(peer); | |
612 | ||
613 | // NP: domain may be a raw-IP but it is now always set | |
614 | assert(!peer->secure.sslDomain.isEmpty()); | |
615 | ||
616 | // const loss is okay here, ssl_ex_index_server is only read and not assigned a destructor | |
617 | SBuf *host = new SBuf(peer->secure.sslDomain); | |
618 | SSL_set_ex_data(ssl, ssl_ex_index_server, host); | |
619 | ||
620 | if (peer->sslSession) | |
621 | SSL_set_session(ssl, peer->sslSession); | |
622 | ||
623 | return ssl; | |
624 | } | |
625 | ||
626 | void | |
627 | Ssl::BlindPeerConnector::noteNegotiationDone(ErrorState *error) | |
628 | { | |
629 | if (error) { | |
630 | // XXX: forward.cc calls peerConnectSucceeded() after an OK TCP connect but | |
631 | // we call peerConnectFailed() if SSL failed afterwards. Is that OK? | |
632 | // It is not clear whether we should call peerConnectSucceeded/Failed() | |
633 | // based on TCP results, SSL results, or both. And the code is probably not | |
634 | // consistent in this aspect across tunnelling and forwarding modules. | |
635 | if (CachePeer *p = serverConnection()->getPeer()) | |
636 | peerConnectFailed(p); | |
637 | return; | |
638 | } | |
639 | ||
640 | const int fd = serverConnection()->fd; | |
641 | SSL *ssl = fd_table[fd].ssl; | |
642 | if (serverConnection()->getPeer() && !SSL_session_reused(ssl)) { | |
643 | if (serverConnection()->getPeer()->sslSession) | |
644 | SSL_SESSION_free(serverConnection()->getPeer()->sslSession); | |
645 | ||
646 | serverConnection()->getPeer()->sslSession = SSL_get1_session(ssl); | |
647 | } | |
648 | } | |
649 | ||
650 | SSL_CTX * | |
651 | Ssl::PeekingPeerConnector::getSslContext() | |
652 | { | |
653 | // XXX: locate a per-server context in Security:: instead | |
654 | return ::Config.ssl_client.sslContext; | |
655 | } | |
656 | ||
657 | SSL * | |
658 | Ssl::PeekingPeerConnector::initializeSsl() | |
659 | { | |
660 | SSL *ssl = Ssl::PeerConnector::initializeSsl(); | |
661 | if (!ssl) | |
662 | return NULL; | |
663 | ||
664 | if (ConnStateData *csd = request->clientConnectionManager.valid()) { | |
665 | ||
666 | // client connection is required in the case we need to splice | |
667 | // or terminate client and server connections | |
668 | assert(clientConn != NULL); | |
669 | SBuf *hostName = NULL; | |
670 | Ssl::ClientBio *cltBio = NULL; | |
671 | ||
672 | //Enable Status_request tls extension, required to bump some clients | |
673 | SSL_set_tlsext_status_type(ssl, TLSEXT_STATUSTYPE_ocsp); | |
674 | ||
675 | // In server-first bumping mode, clientSsl is NULL. | |
676 | if (SSL *clientSsl = fd_table[clientConn->fd].ssl) { | |
677 | BIO *b = SSL_get_rbio(clientSsl); | |
678 | cltBio = static_cast<Ssl::ClientBio *>(b->ptr); | |
679 | const Ssl::Bio::sslFeatures &features = cltBio->getFeatures(); | |
680 | if (!features.serverName.isEmpty()) | |
681 | hostName = new SBuf(features.serverName); | |
682 | } | |
683 | ||
684 | if (!hostName) { | |
685 | // While we are peeking at the certificate, we may not know the server | |
686 | // name that the client will request (after interception or CONNECT) | |
687 | // unless it was the CONNECT request with a user-typed address. | |
688 | const bool isConnectRequest = !csd->port->flags.isIntercepted(); | |
689 | if (!request->flags.sslPeek || isConnectRequest) | |
5c51bffb | 690 | hostName = new SBuf(request->url.host()); |
1b091aec CT |
691 | } |
692 | ||
693 | if (hostName) | |
694 | SSL_set_ex_data(ssl, ssl_ex_index_server, (void*)hostName); | |
695 | ||
696 | Must(!csd->serverBump() || csd->serverBump()->step <= Ssl::bumpStep2); | |
697 | if (csd->sslBumpMode == Ssl::bumpPeek || csd->sslBumpMode == Ssl::bumpStare) { | |
698 | assert(cltBio); | |
699 | const Ssl::Bio::sslFeatures &features = cltBio->getFeatures(); | |
700 | if (features.sslVersion != -1) { | |
701 | features.applyToSSL(ssl, csd->sslBumpMode); | |
702 | // Should we allow it for all protocols? | |
703 | if (features.sslVersion >= 3) { | |
704 | BIO *b = SSL_get_rbio(ssl); | |
705 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
706 | // Inherite client features, like SSL version, SNI and other | |
707 | srvBio->setClientFeatures(features); | |
708 | srvBio->recordInput(true); | |
709 | srvBio->mode(csd->sslBumpMode); | |
710 | } | |
711 | } | |
712 | } else { | |
713 | // Set client SSL options | |
714 | SSL_set_options(ssl, ::Security::ProxyOutgoingConfig.parsedOptions); | |
715 | ||
716 | // Use SNI TLS extension only when we connect directly | |
717 | // to the origin server and we know the server host name. | |
c52a4693 AW |
718 | const char *sniServer = NULL; |
719 | const bool redirected = request->flags.redirected && ::Config.onoff.redir_rewrites_host; | |
720 | if (!hostName || redirected) | |
721 | sniServer = !request->url.hostIsNumeric() ? request->url.host() : NULL; | |
722 | else | |
723 | sniServer = hostName->c_str(); | |
724 | ||
1b091aec CT |
725 | if (sniServer) |
726 | Ssl::setClientSNI(ssl, sniServer); | |
727 | } | |
728 | ||
729 | // store peeked cert to check SQUID_X509_V_ERR_CERT_CHANGE | |
730 | X509 *peeked_cert; | |
731 | if (csd->serverBump() && | |
732 | (peeked_cert = csd->serverBump()->serverCert.get())) { | |
733 | CRYPTO_add(&(peeked_cert->references),1,CRYPTO_LOCK_X509); | |
734 | SSL_set_ex_data(ssl, ssl_ex_index_ssl_peeked_cert, peeked_cert); | |
735 | } | |
736 | } | |
737 | ||
738 | return ssl; | |
739 | } | |
740 | ||
741 | void | |
742 | Ssl::PeekingPeerConnector::noteNegotiationDone(ErrorState *error) | |
743 | { | |
744 | SSL *ssl = fd_table[serverConnection()->fd].ssl; | |
745 | ||
746 | // Check the list error with | |
747 | if (!request->clientConnectionManager.valid() || ! ssl) | |
748 | return; | |
749 | ||
750 | // remember the server certificate from the ErrorDetail object | |
751 | if (Ssl::ServerBump *serverBump = request->clientConnectionManager->serverBump()) { | |
752 | // remember validation errors, if any | |
753 | if (certErrors) { | |
754 | if (serverBump->sslErrors) | |
755 | cbdataReferenceDone(serverBump->sslErrors); | |
756 | serverBump->sslErrors = cbdataReference(certErrors); | |
757 | } | |
758 | ||
759 | if (!serverBump->serverCert.get()) { | |
760 | // remember the server certificate from the ErrorDetail object | |
761 | if (error && error->detail && error->detail->peerCert()) | |
762 | serverBump->serverCert.resetAndLock(error->detail->peerCert()); | |
763 | else { | |
764 | handleServerCertificate(); | |
765 | } | |
766 | } | |
767 | ||
768 | if (error) { | |
769 | // For intercepted connections, set the host name to the server | |
770 | // certificate CN. Otherwise, we just hope that CONNECT is using | |
771 | // a user-entered address (a host name or a user-entered IP). | |
772 | const bool isConnectRequest = !request->clientConnectionManager->port->flags.isIntercepted(); | |
773 | if (request->flags.sslPeek && !isConnectRequest) { | |
774 | if (X509 *srvX509 = serverBump->serverCert.get()) { | |
775 | if (const char *name = Ssl::CommonHostName(srvX509)) { | |
851feda6 | 776 | request->url.host(name); |
1b091aec CT |
777 | debugs(83, 3, "reset request host: " << name); |
778 | } | |
779 | } | |
780 | } | |
781 | } | |
782 | } | |
783 | ||
ce74a2eb CT |
784 | if (!error) { |
785 | serverCertificateVerified(); | |
786 | if (splice) | |
787 | switchToTunnel(request.getRaw(), clientConn, serverConn); | |
788 | } | |
1b091aec CT |
789 | } |
790 | ||
791 | void | |
792 | Ssl::PeekingPeerConnector::noteWantWrite() | |
793 | { | |
794 | const int fd = serverConnection()->fd; | |
795 | SSL *ssl = fd_table[fd].ssl; | |
796 | BIO *b = SSL_get_rbio(ssl); | |
797 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
798 | ||
799 | if ((srvBio->bumpMode() == Ssl::bumpPeek || srvBio->bumpMode() == Ssl::bumpStare) && srvBio->holdWrite()) { | |
800 | debugs(81, DBG_IMPORTANT, "hold write on SSL connection on FD " << fd); | |
801 | checkForPeekAndSplice(); | |
802 | return; | |
803 | } | |
804 | ||
805 | Ssl::PeerConnector::noteWantWrite(); | |
806 | } | |
807 | ||
808 | void | |
809 | Ssl::PeekingPeerConnector::noteSslNegotiationError(const int result, const int ssl_error, const int ssl_lib_error) | |
810 | { | |
811 | const int fd = serverConnection()->fd; | |
812 | SSL *ssl = fd_table[fd].ssl; | |
813 | BIO *b = SSL_get_rbio(ssl); | |
814 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
815 | ||
816 | // In Peek mode, the ClientHello message sent to the server. If the | |
817 | // server resuming a previous (spliced) SSL session with the client, | |
818 | // then probably we are here because local SSL object does not know | |
819 | // anything about the session being resumed. | |
820 | // | |
821 | if (srvBio->bumpMode() == Ssl::bumpPeek && (resumingSession = srvBio->resumingSession())) { | |
822 | // we currently splice all resumed sessions unconditionally | |
823 | if (const bool spliceResumed = true) { | |
824 | bypassCertValidator(); | |
566f8310 | 825 | checkForPeekAndSpliceMatched(Ssl::bumpSplice); |
1b091aec CT |
826 | return; |
827 | } // else fall through to find a matching ssl_bump action (with limited info) | |
828 | } | |
829 | ||
830 | // If we are in peek-and-splice mode and still we did not write to | |
831 | // server yet, try to see if we should splice. | |
832 | // In this case the connection can be saved. | |
833 | // If the checklist decision is do not splice a new error will | |
834 | // occur in the next SSL_connect call, and we will fail again. | |
835 | // Abort on certificate validation errors to avoid splicing and | |
836 | // thus hiding them. | |
837 | // Abort if no certificate found probably because of malformed or | |
838 | // unsupported server Hello message (TODO: make configurable). | |
839 | if (!SSL_get_ex_data(ssl, ssl_ex_index_ssl_error_detail) && | |
840 | (srvBio->bumpMode() == Ssl::bumpPeek || srvBio->bumpMode() == Ssl::bumpStare) && srvBio->holdWrite()) { | |
f97700a0 | 841 | Security::CertPointer serverCert(SSL_get_peer_certificate(ssl)); |
1b091aec CT |
842 | if (serverCert.get()) { |
843 | debugs(81, 3, "Error (" << ERR_error_string(ssl_lib_error, NULL) << ") but, hold write on SSL connection on FD " << fd); | |
844 | checkForPeekAndSplice(); | |
845 | return; | |
846 | } | |
847 | } | |
848 | ||
849 | // else call parent noteNegotiationError to produce an error page | |
850 | Ssl::PeerConnector::noteSslNegotiationError(result, ssl_error, ssl_lib_error); | |
851 | } | |
852 | ||
853 | void | |
854 | Ssl::PeekingPeerConnector::handleServerCertificate() | |
855 | { | |
856 | if (serverCertificateHandled) | |
857 | return; | |
858 | ||
859 | if (ConnStateData *csd = request->clientConnectionManager.valid()) { | |
860 | const int fd = serverConnection()->fd; | |
861 | SSL *ssl = fd_table[fd].ssl; | |
f97700a0 | 862 | Security::CertPointer serverCert(SSL_get_peer_certificate(ssl)); |
1b091aec CT |
863 | if (!serverCert.get()) |
864 | return; | |
865 | ||
866 | serverCertificateHandled = true; | |
867 | ||
1b091aec CT |
868 | // remember the server certificate for later use |
869 | if (Ssl::ServerBump *serverBump = csd->serverBump()) { | |
870 | serverBump->serverCert.reset(serverCert.release()); | |
871 | } | |
872 | } | |
873 | } | |
7fe542fe | 874 | |
ce74a2eb CT |
875 | void |
876 | Ssl::PeekingPeerConnector::serverCertificateVerified() | |
877 | { | |
878 | if (ConnStateData *csd = request->clientConnectionManager.valid()) { | |
f97700a0 | 879 | Security::CertPointer serverCert; |
ce74a2eb CT |
880 | if(Ssl::ServerBump *serverBump = csd->serverBump()) |
881 | serverCert.resetAndLock(serverBump->serverCert.get()); | |
882 | else { | |
883 | const int fd = serverConnection()->fd; | |
884 | SSL *ssl = fd_table[fd].ssl; | |
885 | serverCert.reset(SSL_get_peer_certificate(ssl)); | |
886 | } | |
887 | if (serverCert.get()) { | |
888 | csd->resetSslCommonName(Ssl::CommonHostName(serverCert.get())); | |
889 | debugs(83, 5, "HTTPS server CN: " << csd->sslCommonName() << | |
890 | " bumped: " << *serverConnection()); | |
891 | } | |
892 | } | |
893 | } | |
894 |