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32f1ca3f AJ |
1 | /* |
2 | * Copyright (C) 1996-2016 The Squid Software Foundation and contributors | |
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. | |
7 | */ | |
8 | ||
9 | /* DEBUG: section 83 SSL-Bump Server/Peer negotiation */ | |
10 | ||
11 | #include "squid.h" | |
12 | #include "acl/FilledChecklist.h" | |
13 | #include "client_side.h" | |
14 | #include "errorpage.h" | |
15 | #include "fde.h" | |
0ba8b2ad | 16 | #include "http/Stream.h" |
64d0dd9f | 17 | #include "HttpRequest.h" |
32f1ca3f AJ |
18 | #include "security/NegotiationHistory.h" |
19 | #include "SquidConfig.h" | |
20 | #include "ssl/bio.h" | |
21 | #include "ssl/PeekingPeerConnector.h" | |
22 | #include "ssl/ServerBump.h" | |
23 | ||
24 | CBDATA_NAMESPACED_CLASS_INIT(Ssl, PeekingPeerConnector); | |
25 | ||
26 | void switchToTunnel(HttpRequest *request, Comm::ConnectionPointer & clientConn, Comm::ConnectionPointer &srvConn); | |
27 | ||
28 | void | |
29 | Ssl::PeekingPeerConnector::cbCheckForPeekAndSpliceDone(allow_t answer, void *data) | |
30 | { | |
31 | Ssl::PeekingPeerConnector *peerConnect = (Ssl::PeekingPeerConnector *) data; | |
32 | // Use job calls to add done() checks and other job logic/protections. | |
33 | CallJobHere1(83, 7, CbcPointer<PeekingPeerConnector>(peerConnect), Ssl::PeekingPeerConnector, checkForPeekAndSpliceDone, answer); | |
34 | } | |
35 | ||
36 | void | |
37 | Ssl::PeekingPeerConnector::checkForPeekAndSpliceDone(allow_t answer) | |
38 | { | |
39 | const Ssl::BumpMode finalAction = (answer.code == ACCESS_ALLOWED) ? | |
40 | static_cast<Ssl::BumpMode>(answer.kind): | |
41 | checkForPeekAndSpliceGuess(); | |
42 | checkForPeekAndSpliceMatched(finalAction); | |
43 | } | |
44 | ||
45 | void | |
46 | Ssl::PeekingPeerConnector::checkForPeekAndSplice() | |
47 | { | |
48 | // Mark Step3 of bumping | |
49 | if (request->clientConnectionManager.valid()) { | |
50 | if (Ssl::ServerBump *serverBump = request->clientConnectionManager->serverBump()) { | |
51 | serverBump->step = Ssl::bumpStep3; | |
52 | } | |
53 | } | |
54 | ||
55 | handleServerCertificate(); | |
56 | ||
57 | ACLFilledChecklist *acl_checklist = new ACLFilledChecklist( | |
58 | ::Config.accessList.ssl_bump, | |
59 | request.getRaw(), NULL); | |
d4ddb3e6 | 60 | acl_checklist->al = al; |
32f1ca3f AJ |
61 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpNone)); |
62 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpPeek)); | |
63 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpStare)); | |
64 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpClientFirst)); | |
65 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpServerFirst)); | |
66 | Security::SessionPtr ssl = fd_table[serverConn->fd].ssl.get(); | |
67 | BIO *b = SSL_get_rbio(ssl); | |
68 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
69 | if (!srvBio->canSplice()) | |
70 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpSplice)); | |
71 | if (!srvBio->canBump()) | |
72 | acl_checklist->banAction(allow_t(ACCESS_ALLOWED, Ssl::bumpBump)); | |
73 | acl_checklist->nonBlockingCheck(Ssl::PeekingPeerConnector::cbCheckForPeekAndSpliceDone, this); | |
74 | } | |
75 | ||
76 | void | |
77 | Ssl::PeekingPeerConnector::checkForPeekAndSpliceMatched(const Ssl::BumpMode action) | |
78 | { | |
79 | Security::SessionPtr ssl = fd_table[serverConn->fd].ssl.get(); | |
80 | BIO *b = SSL_get_rbio(ssl); | |
81 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
82 | debugs(83,5, "Will check for peek and splice on FD " << serverConn->fd); | |
83 | ||
84 | Ssl::BumpMode finalAction = action; | |
85 | Must(finalAction == Ssl::bumpSplice || finalAction == Ssl::bumpBump || finalAction == Ssl::bumpTerminate); | |
86 | // Record final decision | |
87 | if (request->clientConnectionManager.valid()) { | |
88 | request->clientConnectionManager->sslBumpMode = finalAction; | |
89 | request->clientConnectionManager->serverBump()->act.step3 = finalAction; | |
90 | } | |
91 | ||
92 | if (finalAction == Ssl::bumpTerminate) { | |
93 | serverConn->close(); | |
94 | clientConn->close(); | |
95 | } else if (finalAction != Ssl::bumpSplice) { | |
96 | //Allow write, proceed with the connection | |
97 | srvBio->holdWrite(false); | |
98 | srvBio->recordInput(false); | |
99 | debugs(83,5, "Retry the fwdNegotiateSSL on FD " << serverConn->fd); | |
100 | Ssl::PeerConnector::noteWantWrite(); | |
101 | } else { | |
102 | splice = true; | |
103 | // Ssl Negotiation stops here. Last SSL checks for valid certificates | |
104 | // and if done, switch to tunnel mode | |
105 | if (sslFinalized()) { | |
106 | debugs(83,5, "Abort NegotiateSSL on FD " << serverConn->fd << " and splice the connection"); | |
56753478 | 107 | callBack(); |
32f1ca3f AJ |
108 | } |
109 | } | |
110 | } | |
111 | ||
112 | Ssl::BumpMode | |
113 | Ssl::PeekingPeerConnector::checkForPeekAndSpliceGuess() const | |
114 | { | |
115 | if (const ConnStateData *csd = request->clientConnectionManager.valid()) { | |
116 | const Ssl::BumpMode currentMode = csd->sslBumpMode; | |
117 | if (currentMode == Ssl::bumpStare) { | |
118 | debugs(83,5, "default to bumping after staring"); | |
119 | return Ssl::bumpBump; | |
120 | } | |
121 | debugs(83,5, "default to splicing after " << currentMode); | |
122 | } else { | |
123 | debugs(83,3, "default to splicing due to missing info"); | |
124 | } | |
125 | ||
126 | return Ssl::bumpSplice; | |
127 | } | |
128 | ||
129 | Security::ContextPtr | |
130 | Ssl::PeekingPeerConnector::getSslContext() | |
131 | { | |
132 | // XXX: locate a per-server context in Security:: instead | |
133 | return ::Config.ssl_client.sslContext; | |
134 | } | |
135 | ||
136 | Security::SessionPtr | |
137 | Ssl::PeekingPeerConnector::initializeSsl() | |
138 | { | |
139 | auto ssl = Ssl::PeerConnector::initializeSsl(); | |
140 | if (!ssl) | |
141 | return nullptr; | |
142 | ||
143 | if (ConnStateData *csd = request->clientConnectionManager.valid()) { | |
144 | ||
145 | // client connection is required in the case we need to splice | |
146 | // or terminate client and server connections | |
147 | assert(clientConn != NULL); | |
148 | SBuf *hostName = NULL; | |
32f1ca3f AJ |
149 | |
150 | //Enable Status_request tls extension, required to bump some clients | |
151 | SSL_set_tlsext_status_type(ssl, TLSEXT_STATUSTYPE_ocsp); | |
152 | ||
3cae14a6 CT |
153 | const Security::TlsDetails::Pointer details = csd->tlsParser.details; |
154 | if (details != NULL && !details->serverName.isEmpty()) | |
155 | hostName = new SBuf(details->serverName); | |
32f1ca3f AJ |
156 | |
157 | if (!hostName) { | |
158 | // While we are peeking at the certificate, we may not know the server | |
159 | // name that the client will request (after interception or CONNECT) | |
160 | // unless it was the CONNECT request with a user-typed address. | |
161 | const bool isConnectRequest = !csd->port->flags.isIntercepted(); | |
162 | if (!request->flags.sslPeek || isConnectRequest) | |
163 | hostName = new SBuf(request->url.host()); | |
164 | } | |
165 | ||
166 | if (hostName) | |
167 | SSL_set_ex_data(ssl, ssl_ex_index_server, (void*)hostName); | |
168 | ||
169 | Must(!csd->serverBump() || csd->serverBump()->step <= Ssl::bumpStep2); | |
170 | if (csd->sslBumpMode == Ssl::bumpPeek || csd->sslBumpMode == Ssl::bumpStare) { | |
3cae14a6 CT |
171 | auto clientSsl = fd_table[clientConn->fd].ssl.get(); |
172 | Must(clientSsl); | |
173 | BIO *bc = SSL_get_rbio(clientSsl); | |
174 | Ssl::ClientBio *cltBio = static_cast<Ssl::ClientBio *>(bc->ptr); | |
175 | Must(cltBio); | |
176 | //const Security::TlsDetails::Pointer &details = csd->tlsParser.details; | |
21530947 CT |
177 | if (details->tlsVersion != -1) { |
178 | applyTlsDetailsToSSL(ssl, details, csd->sslBumpMode); | |
32f1ca3f | 179 | // Should we allow it for all protocols? |
21530947 | 180 | if (details->tlsVersion >= 3) { |
32f1ca3f AJ |
181 | BIO *b = SSL_get_rbio(ssl); |
182 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
183 | // Inherite client features, like SSL version, SNI and other | |
21530947 | 184 | srvBio->setClientFeatures(details, cltBio->rBufData()); |
32f1ca3f AJ |
185 | srvBio->recordInput(true); |
186 | srvBio->mode(csd->sslBumpMode); | |
187 | } | |
188 | } | |
189 | } else { | |
190 | // Set client SSL options | |
191 | SSL_set_options(ssl, ::Security::ProxyOutgoingConfig.parsedOptions); | |
192 | ||
193 | // Use SNI TLS extension only when we connect directly | |
194 | // to the origin server and we know the server host name. | |
195 | const char *sniServer = NULL; | |
196 | const bool redirected = request->flags.redirected && ::Config.onoff.redir_rewrites_host; | |
197 | if (!hostName || redirected) | |
198 | sniServer = !request->url.hostIsNumeric() ? request->url.host() : NULL; | |
199 | else | |
200 | sniServer = hostName->c_str(); | |
201 | ||
202 | if (sniServer) | |
203 | Ssl::setClientSNI(ssl, sniServer); | |
204 | } | |
205 | ||
088f0761 CT |
206 | if (Ssl::ServerBump *serverBump = csd->serverBump()) { |
207 | serverBump->attachServerSSL(ssl); | |
208 | // store peeked cert to check SQUID_X509_V_ERR_CERT_CHANGE | |
209 | if (X509 *peeked_cert = serverBump->serverCert.get()) { | |
210 | CRYPTO_add(&(peeked_cert->references),1,CRYPTO_LOCK_X509); | |
211 | SSL_set_ex_data(ssl, ssl_ex_index_ssl_peeked_cert, peeked_cert); | |
212 | } | |
32f1ca3f AJ |
213 | } |
214 | } | |
215 | ||
216 | return ssl; | |
217 | } | |
218 | ||
219 | void | |
220 | Ssl::PeekingPeerConnector::noteNegotiationDone(ErrorState *error) | |
221 | { | |
222 | Security::SessionPtr ssl = fd_table[serverConnection()->fd].ssl.get(); | |
223 | ||
224 | // Check the list error with | |
225 | if (!request->clientConnectionManager.valid() || ! ssl) | |
226 | return; | |
227 | ||
228 | // remember the server certificate from the ErrorDetail object | |
229 | if (Ssl::ServerBump *serverBump = request->clientConnectionManager->serverBump()) { | |
32f1ca3f AJ |
230 | if (!serverBump->serverCert.get()) { |
231 | // remember the server certificate from the ErrorDetail object | |
232 | if (error && error->detail && error->detail->peerCert()) | |
233 | serverBump->serverCert.resetAndLock(error->detail->peerCert()); | |
234 | else { | |
235 | handleServerCertificate(); | |
236 | } | |
237 | } | |
238 | ||
239 | if (error) { | |
240 | // For intercepted connections, set the host name to the server | |
241 | // certificate CN. Otherwise, we just hope that CONNECT is using | |
242 | // a user-entered address (a host name or a user-entered IP). | |
243 | const bool isConnectRequest = !request->clientConnectionManager->port->flags.isIntercepted(); | |
244 | if (request->flags.sslPeek && !isConnectRequest) { | |
245 | if (X509 *srvX509 = serverBump->serverCert.get()) { | |
246 | if (const char *name = Ssl::CommonHostName(srvX509)) { | |
247 | request->url.host(name); | |
248 | debugs(83, 3, "reset request host: " << name); | |
249 | } | |
250 | } | |
251 | } | |
252 | } | |
253 | } | |
254 | ||
32f1ca3f AJ |
255 | if (!error) { |
256 | serverCertificateVerified(); | |
257 | if (splice) { | |
32f1ca3f | 258 | switchToTunnel(request.getRaw(), clientConn, serverConn); |
56753478 | 259 | tunnelInsteadOfNegotiating(); |
32f1ca3f AJ |
260 | } |
261 | } | |
262 | } | |
263 | ||
264 | void | |
265 | Ssl::PeekingPeerConnector::noteWantWrite() | |
266 | { | |
267 | const int fd = serverConnection()->fd; | |
268 | Security::SessionPtr ssl = fd_table[fd].ssl.get(); | |
269 | BIO *b = SSL_get_rbio(ssl); | |
270 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
271 | ||
272 | if ((srvBio->bumpMode() == Ssl::bumpPeek || srvBio->bumpMode() == Ssl::bumpStare) && srvBio->holdWrite()) { | |
32f1ca3f AJ |
273 | checkForPeekAndSplice(); |
274 | return; | |
275 | } | |
276 | ||
277 | Ssl::PeerConnector::noteWantWrite(); | |
278 | } | |
279 | ||
280 | void | |
281 | Ssl::PeekingPeerConnector::noteSslNegotiationError(const int result, const int ssl_error, const int ssl_lib_error) | |
282 | { | |
283 | const int fd = serverConnection()->fd; | |
284 | Security::SessionPtr ssl = fd_table[fd].ssl.get(); | |
285 | BIO *b = SSL_get_rbio(ssl); | |
286 | Ssl::ServerBio *srvBio = static_cast<Ssl::ServerBio *>(b->ptr); | |
287 | ||
288 | // In Peek mode, the ClientHello message sent to the server. If the | |
289 | // server resuming a previous (spliced) SSL session with the client, | |
290 | // then probably we are here because local SSL object does not know | |
291 | // anything about the session being resumed. | |
292 | // | |
293 | if (srvBio->bumpMode() == Ssl::bumpPeek && (resumingSession = srvBio->resumingSession())) { | |
294 | // we currently splice all resumed sessions unconditionally | |
295 | if (const bool spliceResumed = true) { | |
296 | bypassCertValidator(); | |
297 | checkForPeekAndSpliceMatched(Ssl::bumpSplice); | |
298 | return; | |
299 | } // else fall through to find a matching ssl_bump action (with limited info) | |
300 | } | |
301 | ||
302 | // If we are in peek-and-splice mode and still we did not write to | |
303 | // server yet, try to see if we should splice. | |
304 | // In this case the connection can be saved. | |
305 | // If the checklist decision is do not splice a new error will | |
306 | // occur in the next SSL_connect call, and we will fail again. | |
307 | // Abort on certificate validation errors to avoid splicing and | |
308 | // thus hiding them. | |
309 | // Abort if no certificate found probably because of malformed or | |
310 | // unsupported server Hello message (TODO: make configurable). | |
311 | if (!SSL_get_ex_data(ssl, ssl_ex_index_ssl_error_detail) && | |
312 | (srvBio->bumpMode() == Ssl::bumpPeek || srvBio->bumpMode() == Ssl::bumpStare) && srvBio->holdWrite()) { | |
313 | Security::CertPointer serverCert(SSL_get_peer_certificate(ssl)); | |
314 | if (serverCert.get()) { | |
315 | debugs(81, 3, "Error (" << ERR_error_string(ssl_lib_error, NULL) << ") but, hold write on SSL connection on FD " << fd); | |
316 | checkForPeekAndSplice(); | |
317 | return; | |
318 | } | |
319 | } | |
320 | ||
321 | // else call parent noteNegotiationError to produce an error page | |
322 | Ssl::PeerConnector::noteSslNegotiationError(result, ssl_error, ssl_lib_error); | |
323 | } | |
324 | ||
325 | void | |
326 | Ssl::PeekingPeerConnector::handleServerCertificate() | |
327 | { | |
328 | if (serverCertificateHandled) | |
329 | return; | |
330 | ||
331 | if (ConnStateData *csd = request->clientConnectionManager.valid()) { | |
332 | const int fd = serverConnection()->fd; | |
333 | Security::SessionPtr ssl = fd_table[fd].ssl.get(); | |
334 | Security::CertPointer serverCert(SSL_get_peer_certificate(ssl)); | |
335 | if (!serverCert.get()) | |
336 | return; | |
337 | ||
338 | serverCertificateHandled = true; | |
339 | ||
340 | // remember the server certificate for later use | |
341 | if (Ssl::ServerBump *serverBump = csd->serverBump()) { | |
342 | serverBump->serverCert.reset(serverCert.release()); | |
343 | } | |
344 | } | |
345 | } | |
346 | ||
347 | void | |
348 | Ssl::PeekingPeerConnector::serverCertificateVerified() | |
349 | { | |
350 | if (ConnStateData *csd = request->clientConnectionManager.valid()) { | |
351 | Security::CertPointer serverCert; | |
352 | if(Ssl::ServerBump *serverBump = csd->serverBump()) | |
353 | serverCert.resetAndLock(serverBump->serverCert.get()); | |
354 | else { | |
355 | const int fd = serverConnection()->fd; | |
356 | Security::SessionPtr ssl = fd_table[fd].ssl.get(); | |
357 | serverCert.reset(SSL_get_peer_certificate(ssl)); | |
358 | } | |
359 | if (serverCert.get()) { | |
360 | csd->resetSslCommonName(Ssl::CommonHostName(serverCert.get())); | |
361 | debugs(83, 5, "HTTPS server CN: " << csd->sslCommonName() << | |
362 | " bumped: " << *serverConnection()); | |
363 | } | |
364 | } | |
365 | } | |
366 | ||
56753478 CT |
367 | void |
368 | Ssl::PeekingPeerConnector::tunnelInsteadOfNegotiating() | |
369 | { | |
370 | Must(callback != NULL); | |
371 | CbDialer *dialer = dynamic_cast<CbDialer*>(callback->getDialer()); | |
372 | Must(dialer); | |
373 | dialer->answer().tunneled = true; | |
374 | debugs(83, 5, "The SSL negotiation with server aborted"); | |
375 | } | |
376 |