2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2008 John Brooks <john.brooks@dereferenced.net>
6 * Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
7 * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
8 * Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
10 * This file is part of InspIRCd. InspIRCd is free software: you can
11 * redistribute it and/or modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation, version 2.
14 * This program is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include <gnutls/gnutls.h>
27 #include <gnutls/x509.h>
28 #include "modules/ssl.h"
29 #include "modules/cap.h"
32 # pragma comment(lib, "libgnutls.lib")
33 # pragma comment(lib, "libgcrypt.lib")
34 # pragma comment(lib, "libgpg-error.lib")
35 # pragma comment(lib, "user32.lib")
36 # pragma comment(lib, "advapi32.lib")
37 # pragma comment(lib, "libgcc.lib")
38 # pragma comment(lib, "libmingwex.lib")
39 # pragma comment(lib, "gdi32.lib")
42 /* $ModDesc: Provides SSL support for clients */
43 /* $CompileFlags: pkgconfincludes("gnutls","/gnutls/gnutls.h","") exec("libgcrypt-config --cflags") */
44 /* $LinkerFlags: rpath("pkg-config --libs gnutls") pkgconflibs("gnutls","/libgnutls.so","-lgnutls") exec("libgcrypt-config --libs") */
47 // These don't exist in older GnuTLS versions
48 #if ((GNUTLS_VERSION_MAJOR > 2) || (GNUTLS_VERSION_MAJOR == 2 && GNUTLS_VERSION_MINOR > 1) || (GNUTLS_VERSION_MAJOR == 2 && GNUTLS_VERSION_MINOR == 1 && GNUTLS_VERSION_MICRO >= 7))
49 #define GNUTLS_NEW_PRIO_API
52 #if(GNUTLS_VERSION_MAJOR < 2)
53 typedef gnutls_certificate_credentials_t gnutls_certificate_credentials;
54 typedef gnutls_dh_params_t gnutls_dh_params;
57 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
59 static std::vector<gnutls_x509_crt_t> x509_certs;
60 static gnutls_x509_privkey_t x509_key;
61 #if(GNUTLS_VERSION_MAJOR < 2 || ( GNUTLS_VERSION_MAJOR == 2 && GNUTLS_VERSION_MINOR < 12 ) )
62 static int cert_callback (gnutls_session_t session, const gnutls_datum_t * req_ca_rdn, int nreqs,
63 const gnutls_pk_algorithm_t * sign_algos, int sign_algos_length, gnutls_retr_st * st) {
65 st->type = GNUTLS_CRT_X509;
67 static int cert_callback (gnutls_session_t session, const gnutls_datum_t * req_ca_rdn, int nreqs,
68 const gnutls_pk_algorithm_t * sign_algos, int sign_algos_length, gnutls_retr2_st * st) {
69 st->cert_type = GNUTLS_CRT_X509;
70 st->key_type = GNUTLS_PRIVKEY_X509;
72 st->ncerts = x509_certs.size();
73 st->cert.x509 = &x509_certs[0];
74 st->key.x509 = x509_key;
80 class RandGen : public HandlerBase2<void, char*, size_t>
84 void Call(char* buffer, size_t len)
86 gcry_randomize(buffer, len, GCRY_STRONG_RANDOM);
90 /** Represents an SSL user's extra data
96 gnutls_session_t sess;
98 reference<ssl_cert> cert;
100 issl_session() : socket(NULL), sess(NULL) {}
103 class CommandStartTLS : public SplitCommand
107 CommandStartTLS (Module* mod) : SplitCommand(mod, "STARTTLS")
110 works_before_reg = true;
113 CmdResult HandleLocal(const std::vector<std::string> ¶meters, LocalUser *user)
117 user->WriteNumeric(691, "%s :STARTTLS is not enabled", user->nick.c_str());
121 if (user->registered == REG_ALL)
123 user->WriteNumeric(691, "%s :STARTTLS is not permitted after client registration is complete", user->nick.c_str());
127 if (!user->eh.GetIOHook())
129 user->WriteNumeric(670, "%s :STARTTLS successful, go ahead with TLS handshake", user->nick.c_str());
130 /* We need to flush the write buffer prior to adding the IOHook,
131 * otherwise we'll be sending this line inside the SSL session - which
132 * won't start its handshake until the client gets this line. Currently,
133 * we assume the write will not block here; this is usually safe, as
134 * STARTTLS is sent very early on in the registration phase, where the
135 * user hasn't built up much sendq. Handling a blocked write here would
139 user->eh.AddIOHook(creator);
140 creator->OnStreamSocketAccept(&user->eh, NULL, NULL);
143 user->WriteNumeric(691, "%s :STARTTLS failure", user->nick.c_str());
150 class ModuleSSLGnuTLS : public Module
152 issl_session* sessions;
154 gnutls_certificate_credentials_t x509_cred;
155 gnutls_dh_params_t dh_params;
156 gnutls_digest_algorithm_t hash;
157 #ifdef GNUTLS_NEW_PRIO_API
158 gnutls_priority_t priority;
161 std::string sslports;
168 CommandStartTLS starttls;
170 GenericCap capHandler;
171 ServiceProvider iohook;
173 inline static const char* UnknownIfNULL(const char* str)
175 return str ? str : "UNKNOWN";
178 static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size)
180 issl_session* session = reinterpret_cast<issl_session*>(session_wrap);
181 if (session->socket->GetEventMask() & FD_READ_WILL_BLOCK)
184 gnutls_transport_set_errno(session->sess, EAGAIN);
191 int rv = ServerInstance->SE->Recv(session->socket, reinterpret_cast<char *>(buffer), size, 0);
196 /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
197 * and then set errno appropriately.
198 * The gnutls library may also have a different errno variable than us, see
199 * gnutls_transport_set_errno(3).
201 gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
206 ServerInstance->SE->ChangeEventMask(session->socket, FD_READ_WILL_BLOCK);
210 static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size)
212 issl_session* session = reinterpret_cast<issl_session*>(session_wrap);
213 if (session->socket->GetEventMask() & FD_WRITE_WILL_BLOCK)
216 gnutls_transport_set_errno(session->sess, EAGAIN);
223 int rv = ServerInstance->SE->Send(session->socket, reinterpret_cast<const char *>(buffer), size, 0);
228 /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
229 * and then set errno appropriately.
230 * The gnutls library may also have a different errno variable than us, see
231 * gnutls_transport_set_errno(3).
233 gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
238 ServerInstance->SE->ChangeEventMask(session->socket, FD_WRITE_WILL_BLOCK);
244 : starttls(this), capHandler(this, "tls"), iohook(this, "ssl/gnutls", SERVICE_IOHOOK)
246 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
248 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
250 gnutls_global_init(); // This must be called once in the program
251 gnutls_x509_privkey_init(&x509_key);
253 #ifdef GNUTLS_NEW_PRIO_API
254 // Init this here so it's always initialized, avoids an extra boolean
255 gnutls_priority_init(&priority, "NORMAL", NULL);
262 void init() CXX11_OVERRIDE
264 // Needs the flag as it ignores a plain /rehash
265 OnModuleRehash(NULL,"ssl");
267 ServerInstance->GenRandom = &randhandler;
269 // Void return, guess we assume success
270 gnutls_certificate_set_dh_params(x509_cred, dh_params);
271 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnUserConnect,
272 I_OnEvent, I_OnHookIO };
273 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
275 ServerInstance->Modules->AddService(iohook);
276 ServerInstance->Modules->AddService(starttls);
279 void OnRehash(User* user) CXX11_OVERRIDE
283 ConfigTag* Conf = ServerInstance->Config->ConfValue("gnutls");
284 starttls.enabled = Conf->getBool("starttls", true);
286 if (Conf->getBool("showports", true))
288 sslports = Conf->getString("advertisedports");
289 if (!sslports.empty())
292 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
294 ListenSocket* port = ServerInstance->ports[i];
295 if (port->bind_tag->getString("ssl") != "gnutls")
298 const std::string& portid = port->bind_desc;
299 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
301 if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
304 * Found an SSL port for clients that is not bound to 127.0.0.1 and handled by us, display
305 * the IP:port in ISUPPORT.
307 * We used to advertise all ports seperated by a ';' char that matched the above criteria,
308 * but this resulted in too long ISUPPORT lines if there were lots of ports to be displayed.
309 * To solve this by default we now only display the first IP:port found and let the user
310 * configure the exact value for the 005 token, if necessary.
319 void OnModuleRehash(User* user, const std::string ¶m) CXX11_OVERRIDE
325 std::string certfile;
330 ConfigTag* Conf = ServerInstance->Config->ConfValue("gnutls");
332 cafile = Conf->getString("cafile", CONFIG_PATH "/ca.pem");
333 crlfile = Conf->getString("crlfile", CONFIG_PATH "/crl.pem");
334 certfile = Conf->getString("certfile", CONFIG_PATH "/cert.pem");
335 keyfile = Conf->getString("keyfile", CONFIG_PATH "/key.pem");
336 dh_bits = Conf->getInt("dhbits");
337 std::string hashname = Conf->getString("hash", "md5");
339 // The GnuTLS manual states that the gnutls_set_default_priority()
340 // call we used previously when initializing the session is the same
341 // as setting the "NORMAL" priority string.
342 // Thus if the setting below is not in the config we will behave exactly
343 // the same as before, when the priority setting wasn't available.
344 std::string priorities = Conf->getString("priority", "NORMAL");
346 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
349 if (hashname == "md5")
350 hash = GNUTLS_DIG_MD5;
351 else if (hashname == "sha1")
352 hash = GNUTLS_DIG_SHA1;
354 throw ModuleException("Unknown hash type " + hashname);
361 gnutls_dh_params_deinit(dh_params);
368 // Deallocate the old credentials
369 gnutls_certificate_free_credentials(x509_cred);
371 for(unsigned int i=0; i < x509_certs.size(); i++)
372 gnutls_x509_crt_deinit(x509_certs[i]);
376 ret = gnutls_certificate_allocate_credentials(&x509_cred);
377 cred_alloc = (ret >= 0);
379 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
381 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
382 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEBUG, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
384 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
385 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEBUG, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
389 reader.Load(certfile);
390 std::string cert_string = reader.GetString();
391 gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), static_cast<unsigned int>(cert_string.length()) };
393 reader.Load(keyfile);
394 std::string key_string = reader.GetString();
395 gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), static_cast<unsigned int>(key_string.length()) };
397 // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
398 unsigned int certcount = 3;
399 x509_certs.resize(certcount);
400 ret = gnutls_x509_crt_list_import(&x509_certs[0], &certcount, &cert_datum, GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
401 if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
403 // the buffer wasn't big enough to hold all certs but gnutls updated certcount to the number of available certs, try again with a bigger buffer
404 x509_certs.resize(certcount);
405 ret = gnutls_x509_crt_list_import(&x509_certs[0], &certcount, &cert_datum, GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
410 // clear the vector so we won't call gnutls_x509_crt_deinit() on the (uninited) certs later
412 throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + ((ret < 0) ? (std::string(gnutls_strerror(ret))) : "No certs could be read"));
414 x509_certs.resize(ret);
416 if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0)
417 throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret)));
419 if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_certs[0], certcount, x509_key)) < 0)
420 throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret)));
422 #ifdef GNUTLS_NEW_PRIO_API
423 // It's safe to call this every time as we cannot have this uninitialized, see constructor and below.
424 gnutls_priority_deinit(priority);
426 // Try to set the priorities for ciphers, kex methods etc. to the user supplied string
427 // If the user did not supply anything then the string is already set to "NORMAL"
428 const char* priocstr = priorities.c_str();
429 const char* prioerror;
431 if ((ret = gnutls_priority_init(&priority, priocstr, &prioerror)) < 0)
433 // gnutls did not understand the user supplied string, log and fall back to the default priorities
434 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Failed to set priorities to \"%s\": %s Syntax error at position %u, falling back to default (NORMAL)", priorities.c_str(), gnutls_strerror(ret), (unsigned int) (prioerror - priocstr));
435 gnutls_priority_init(&priority, "NORMAL", NULL);
439 if (priorities != "NORMAL")
440 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: You've set <gnutls:priority> to a value other than the default, but this is only supported with GnuTLS v2.1.7 or newer. Your GnuTLS version is older than that so the option will have no effect.");
443 #if(GNUTLS_VERSION_MAJOR < 2 || ( GNUTLS_VERSION_MAJOR == 2 && GNUTLS_VERSION_MINOR < 12 ) )
444 gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback);
446 gnutls_certificate_set_retrieve_function (x509_cred, cert_callback);
448 ret = gnutls_dh_params_init(&dh_params);
449 dh_alloc = (ret >= 0);
452 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
456 std::string dhfile = Conf->getString("dhfile");
459 // Try to load DH params from file
461 std::string dhstring = reader.GetString();
462 gnutls_datum_t dh_datum = { (unsigned char*)dhstring.data(), static_cast<unsigned int>(dhstring.length()) };
464 if ((ret = gnutls_dh_params_import_pkcs3(dh_params, &dh_datum, GNUTLS_X509_FMT_PEM)) < 0)
466 // File unreadable or GnuTLS was unhappy with the contents, generate the DH primes now
467 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Generating DH parameters because I failed to load them from file '%s': %s", dhfile.c_str(), gnutls_strerror(ret));
477 void GenerateDHParams()
479 // Generate Diffie Hellman parameters - for use with DHE
480 // kx algorithms. These should be discarded and regenerated
481 // once a day, once a week or once a month. Depending on the
482 // security requirements.
489 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
490 ServerInstance->Logs->Log("m_ssl_gnutls", LOG_DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
495 for(unsigned int i=0; i < x509_certs.size(); i++)
496 gnutls_x509_crt_deinit(x509_certs[i]);
498 gnutls_x509_privkey_deinit(x509_key);
499 #ifdef GNUTLS_NEW_PRIO_API
500 gnutls_priority_deinit(priority);
504 gnutls_dh_params_deinit(dh_params);
506 gnutls_certificate_free_credentials(x509_cred);
508 gnutls_global_deinit();
510 ServerInstance->GenRandom = &ServerInstance->HandleGenRandom;
513 void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
515 if(target_type == TYPE_USER)
517 LocalUser* user = IS_LOCAL(static_cast<User*>(item));
519 if (user && user->eh.GetIOHook() == this)
521 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
522 // Potentially there could be multiple SSL modules loaded at once on different ports.
523 ServerInstance->Users->QuitUser(user, "SSL module unloading");
528 Version GetVersion() CXX11_OVERRIDE
530 return Version("Provides SSL support for clients", VF_VENDOR);
533 void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
535 if (!sslports.empty())
536 tokens["SSL"] = sslports;
537 if (starttls.enabled)
541 void OnHookIO(StreamSocket* user, ListenSocket* lsb) CXX11_OVERRIDE
543 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "gnutls")
545 /* Hook the user with our module */
546 user->AddIOHook(this);
550 void OnRequest(Request& request) CXX11_OVERRIDE
552 if (strcmp("GET_SSL_CERT", request.id) == 0)
554 SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
555 int fd = req.sock->GetFd();
556 issl_session* session = &sessions[fd];
558 req.cert = session->cert;
562 void InitSession(StreamSocket* user, bool me_server)
564 issl_session* session = &sessions[user->GetFd()];
566 gnutls_init(&session->sess, me_server ? GNUTLS_SERVER : GNUTLS_CLIENT);
567 session->socket = user;
569 #ifdef GNUTLS_NEW_PRIO_API
570 gnutls_priority_set(session->sess, priority);
572 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
573 gnutls_dh_set_prime_bits(session->sess, dh_bits);
574 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(session));
575 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
576 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
579 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
581 Handshake(session, user);
584 void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
586 issl_session* session = &sessions[user->GetFd()];
588 /* For STARTTLS: Don't try and init a session on a socket that already has a session */
592 InitSession(user, true);
595 void OnStreamSocketConnect(StreamSocket* user) CXX11_OVERRIDE
597 InitSession(user, false);
600 void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
602 CloseSession(&sessions[user->GetFd()]);
605 int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
607 issl_session* session = &sessions[user->GetFd()];
611 CloseSession(session);
612 user->SetError("No SSL session");
616 if (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE)
618 // The handshake isn't finished, try to finish it.
620 if(!Handshake(session, user))
622 if (session->status != ISSL_CLOSING)
628 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
630 if (session->status == ISSL_HANDSHAKEN)
632 char* buffer = ServerInstance->GetReadBuffer();
633 size_t bufsiz = ServerInstance->Config->NetBufferSize;
634 int ret = gnutls_record_recv(session->sess, buffer, bufsiz);
637 recvq.append(buffer, ret);
640 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
646 user->SetError("Connection closed");
647 CloseSession(session);
652 user->SetError(gnutls_strerror(ret));
653 CloseSession(session);
657 else if (session->status == ISSL_CLOSING)
663 int OnStreamSocketWrite(StreamSocket* user, std::string& sendq) CXX11_OVERRIDE
665 issl_session* session = &sessions[user->GetFd()];
669 CloseSession(session);
670 user->SetError("No SSL session");
674 if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ)
676 // The handshake isn't finished, try to finish it.
677 Handshake(session, user);
678 if (session->status != ISSL_CLOSING)
685 if (session->status == ISSL_HANDSHAKEN)
687 ret = gnutls_record_send(session->sess, sendq.data(), sendq.length());
689 if (ret == (int)sendq.length())
691 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE);
696 sendq = sendq.substr(ret);
697 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
700 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
702 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
707 user->SetError(gnutls_strerror(ret));
708 CloseSession(session);
716 bool Handshake(issl_session* session, StreamSocket* user)
718 int ret = gnutls_handshake(session->sess);
722 if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
724 // Handshake needs resuming later, read() or write() would have blocked.
726 if(gnutls_record_get_direction(session->sess) == 0)
728 // gnutls_handshake() wants to read() again.
729 session->status = ISSL_HANDSHAKING_READ;
730 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
734 // gnutls_handshake() wants to write() again.
735 session->status = ISSL_HANDSHAKING_WRITE;
736 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
741 user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret)));
742 CloseSession(session);
743 session->status = ISSL_CLOSING;
750 // Change the seesion state
751 session->status = ISSL_HANDSHAKEN;
753 VerifyCertificate(session,user);
755 // Finish writing, if any left
756 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
762 void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
764 if (user->eh.GetIOHook() == this)
766 if (sessions[user->eh.GetFd()].sess)
768 const gnutls_session_t& sess = sessions[user->eh.GetFd()].sess;
769 std::string cipher = UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess)));
770 cipher.append("-").append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).append("-");
771 cipher.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess))));
773 ssl_cert* cert = sessions[user->eh.GetFd()].cert;
774 if (cert->fingerprint.empty())
775 user->WriteNotice("*** You are connected using SSL cipher '" + cipher + "'");
777 user->WriteNotice("*** You are connected using SSL cipher '" + cipher +
778 "' and your SSL fingerprint is " + cert->fingerprint);
783 void CloseSession(issl_session* session)
787 gnutls_bye(session->sess, GNUTLS_SHUT_WR);
788 gnutls_deinit(session->sess);
790 session->socket = NULL;
791 session->sess = NULL;
792 session->cert = NULL;
793 session->status = ISSL_NONE;
796 void VerifyCertificate(issl_session* session, StreamSocket* user)
798 if (!session->sess || !user)
802 const gnutls_datum_t* cert_list;
804 unsigned int cert_list_size;
805 gnutls_x509_crt_t cert;
807 unsigned char digest[MAXBUF];
808 size_t digest_size = sizeof(digest);
809 size_t name_size = sizeof(name);
810 ssl_cert* certinfo = new ssl_cert;
811 session->cert = certinfo;
813 /* This verification function uses the trusted CAs in the credentials
814 * structure. So you must have installed one or more CA certificates.
816 ret = gnutls_certificate_verify_peers2(session->sess, &status);
820 certinfo->error = std::string(gnutls_strerror(ret));
824 certinfo->invalid = (status & GNUTLS_CERT_INVALID);
825 certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND);
826 certinfo->revoked = (status & GNUTLS_CERT_REVOKED);
827 certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA);
829 /* Up to here the process is the same for X.509 certificates and
830 * OpenPGP keys. From now on X.509 certificates are assumed. This can
831 * be easily extended to work with openpgp keys as well.
833 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
835 certinfo->error = "No X509 keys sent";
839 ret = gnutls_x509_crt_init(&cert);
842 certinfo->error = gnutls_strerror(ret);
847 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
848 if (cert_list == NULL)
850 certinfo->error = "No certificate was found";
851 goto info_done_dealloc;
854 /* This is not a real world example, since we only check the first
855 * certificate in the given chain.
858 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
861 certinfo->error = gnutls_strerror(ret);
862 goto info_done_dealloc;
865 gnutls_x509_crt_get_dn(cert, name, &name_size);
868 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
869 certinfo->issuer = name;
871 if ((ret = gnutls_x509_crt_get_fingerprint(cert, hash, digest, &digest_size)) < 0)
873 certinfo->error = gnutls_strerror(ret);
877 certinfo->fingerprint = BinToHex(digest, digest_size);
880 /* Beware here we do not check for errors.
882 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
884 certinfo->error = "Not activated, or expired certificate";
888 gnutls_x509_crt_deinit(cert);
891 void OnEvent(Event& ev) CXX11_OVERRIDE
893 if (starttls.enabled)
894 capHandler.HandleEvent(ev);
898 MODULE_INIT(ModuleSSLGnuTLS)