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/>.
25 #include <gnutls/gnutls.h>
26 #include <gnutls/x509.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","") */
44 /* $LinkerFlags: rpath("pkg-config --libs gnutls") pkgconflibs("gnutls","/libgnutls.so","-lgnutls") -lgcrypt */
46 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
48 static std::vector<gnutls_x509_crt_t> x509_certs;
49 static gnutls_x509_privkey_t x509_key;
50 static int cert_callback (gnutls_session_t session, const gnutls_datum_t * req_ca_rdn, int nreqs,
51 const gnutls_pk_algorithm_t * sign_algos, int sign_algos_length, gnutls_retr_st * st) {
53 st->type = GNUTLS_CRT_X509;
54 st->ncerts = x509_certs.size();
55 st->cert.x509 = &x509_certs[0];
56 st->key.x509 = x509_key;
62 static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t user_wrap, void* buffer, size_t size)
64 StreamSocket* user = reinterpret_cast<StreamSocket*>(user_wrap);
65 if (user->GetEventMask() & FD_READ_WILL_BLOCK)
70 int rv = ServerInstance->SE->Recv(user, reinterpret_cast<char *>(buffer), size, 0);
72 ServerInstance->SE->ChangeEventMask(user, FD_READ_WILL_BLOCK);
76 static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t user_wrap, const void* buffer, size_t size)
78 StreamSocket* user = reinterpret_cast<StreamSocket*>(user_wrap);
79 if (user->GetEventMask() & FD_WRITE_WILL_BLOCK)
84 int rv = ServerInstance->SE->Send(user, reinterpret_cast<const char *>(buffer), size, 0);
86 ServerInstance->SE->ChangeEventMask(user, FD_WRITE_WILL_BLOCK);
90 class RandGen : public HandlerBase2<void, char*, size_t>
94 void Call(char* buffer, size_t len)
96 gcry_randomize(buffer, len, GCRY_STRONG_RANDOM);
100 /** Represents an SSL user's extra data
105 gnutls_session_t sess;
107 reference<ssl_cert> cert;
108 issl_session() : sess(NULL) {}
111 class CommandStartTLS : public SplitCommand
115 CommandStartTLS (Module* mod) : SplitCommand(mod, "STARTTLS")
118 works_before_reg = true;
121 CmdResult HandleLocal(const std::vector<std::string> ¶meters, LocalUser *user)
125 user->WriteNumeric(691, "%s :STARTTLS is not enabled", user->nick.c_str());
129 if (user->registered == REG_ALL)
131 user->WriteNumeric(691, "%s :STARTTLS is not permitted after client registration is complete", user->nick.c_str());
135 if (!user->eh.GetIOHook())
137 user->WriteNumeric(670, "%s :STARTTLS successful, go ahead with TLS handshake", user->nick.c_str());
138 /* We need to flush the write buffer prior to adding the IOHook,
139 * otherwise we'll be sending this line inside the SSL session - which
140 * won't start its handshake until the client gets this line. Currently,
141 * we assume the write will not block here; this is usually safe, as
142 * STARTTLS is sent very early on in the registration phase, where the
143 * user hasn't built up much sendq. Handling a blocked write here would
147 user->eh.AddIOHook(creator);
148 creator->OnStreamSocketAccept(&user->eh, NULL, NULL);
151 user->WriteNumeric(691, "%s :STARTTLS failure", user->nick.c_str());
158 class ModuleSSLGnuTLS : public Module
160 issl_session* sessions;
162 gnutls_certificate_credentials x509_cred;
163 gnutls_dh_params dh_params;
164 gnutls_digest_algorithm_t hash;
166 std::string sslports;
173 CommandStartTLS starttls;
175 GenericCap capHandler;
176 ServiceProvider iohook;
180 : starttls(this), capHandler(this, "tls"), iohook(this, "ssl/gnutls", SERVICE_IOHOOK)
182 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
184 gnutls_global_init(); // This must be called once in the program
185 gnutls_x509_privkey_init(&x509_key);
193 // Needs the flag as it ignores a plain /rehash
194 OnModuleRehash(NULL,"ssl");
196 ServerInstance->GenRandom = &randhandler;
198 // Void return, guess we assume success
199 gnutls_certificate_set_dh_params(x509_cred, dh_params);
200 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnUserConnect,
201 I_OnEvent, I_OnHookIO };
202 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
204 ServerInstance->Modules->AddService(iohook);
205 ServerInstance->AddCommand(&starttls);
208 void OnRehash(User* user)
212 ConfigTag* Conf = ServerInstance->Config->ConfValue("gnutls");
213 starttls.enabled = Conf->getBool("starttls", true);
215 if (Conf->getBool("showports", true))
217 sslports = Conf->getString("advertisedports");
218 if (!sslports.empty())
221 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
223 ListenSocket* port = ServerInstance->ports[i];
224 if (port->bind_tag->getString("ssl") != "gnutls")
227 const std::string& portid = port->bind_desc;
228 ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
230 if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
231 sslports.append(portid).append(";");
234 if (!sslports.empty())
235 sslports.erase(sslports.end() - 1);
239 void OnModuleRehash(User* user, const std::string ¶m)
245 std::string certfile;
250 ConfigTag* Conf = ServerInstance->Config->ConfValue("gnutls");
252 cafile = Conf->getString("cafile", "conf/ca.pem");
253 crlfile = Conf->getString("crlfile", "conf/crl.pem");
254 certfile = Conf->getString("certfile", "conf/cert.pem");
255 keyfile = Conf->getString("keyfile", "conf/key.pem");
256 dh_bits = Conf->getInt("dhbits");
257 std::string hashname = Conf->getString("hash", "md5");
259 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
262 if (hashname == "md5")
263 hash = GNUTLS_DIG_MD5;
264 else if (hashname == "sha1")
265 hash = GNUTLS_DIG_SHA1;
267 throw ModuleException("Unknown hash type " + hashname);
274 gnutls_dh_params_deinit(dh_params);
280 // Deallocate the old credentials
281 gnutls_certificate_free_credentials(x509_cred);
283 for(unsigned int i=0; i < x509_certs.size(); i++)
284 gnutls_x509_crt_deinit(x509_certs[i]);
288 ret = gnutls_certificate_allocate_credentials(&x509_cred);
289 cred_alloc = (ret >= 0);
291 ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
293 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
294 ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
296 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
297 ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
301 reader.LoadFile(certfile);
302 std::string cert_string = reader.Contents();
303 gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), cert_string.length() };
305 reader.LoadFile(keyfile);
306 std::string key_string = reader.Contents();
307 gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), key_string.length() };
309 // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
310 unsigned int certcount = Conf->getInt("certcount", 3);
311 x509_certs.resize(certcount);
312 ret = gnutls_x509_crt_list_import(&x509_certs[0], &certcount, &cert_datum, GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
314 throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + std::string(gnutls_strerror(ret)));
315 x509_certs.resize(certcount);
317 if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0)
318 throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret)));
320 if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_certs[0], certcount, x509_key)) < 0)
321 throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret)));
323 gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback);
325 ret = gnutls_dh_params_init(&dh_params);
326 dh_alloc = (ret >= 0);
328 ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
330 // This may be on a large (once a day or week) timer eventually.
334 void GenerateDHParams()
336 // Generate Diffie Hellman parameters - for use with DHE
337 // kx algorithms. These should be discarded and regenerated
338 // once a day, once a week or once a month. Depending on the
339 // security requirements.
346 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
347 ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
352 for(unsigned int i=0; i < x509_certs.size(); i++)
353 gnutls_x509_crt_deinit(x509_certs[i]);
355 gnutls_x509_privkey_deinit(x509_key);
358 gnutls_dh_params_deinit(dh_params);
360 gnutls_certificate_free_credentials(x509_cred);
362 gnutls_global_deinit();
364 ServerInstance->GenRandom = &ServerInstance->HandleGenRandom;
367 void OnCleanup(int target_type, void* item)
369 if(target_type == TYPE_USER)
371 LocalUser* user = IS_LOCAL(static_cast<User*>(item));
373 if (user && user->eh.GetIOHook() == this)
375 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
376 // Potentially there could be multiple SSL modules loaded at once on different ports.
377 ServerInstance->Users->QuitUser(user, "SSL module unloading");
384 return Version("Provides SSL support for clients", VF_VENDOR);
388 void On005Numeric(std::string &output)
390 if (!sslports.empty())
391 output.append(" SSL=" + sslports);
392 if (starttls.enabled)
393 output.append(" STARTTLS");
396 void OnHookIO(StreamSocket* user, ListenSocket* lsb)
398 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "gnutls")
400 /* Hook the user with our module */
401 user->AddIOHook(this);
405 void OnRequest(Request& request)
407 if (strcmp("GET_SSL_CERT", request.id) == 0)
409 SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
410 int fd = req.sock->GetFd();
411 issl_session* session = &sessions[fd];
413 req.cert = session->cert;
417 void InitSession(StreamSocket* user, bool me_server)
419 issl_session* session = &sessions[user->GetFd()];
421 gnutls_init(&session->sess, me_server ? GNUTLS_SERVER : GNUTLS_CLIENT);
423 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
424 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
425 gnutls_dh_set_prime_bits(session->sess, dh_bits);
426 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
427 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
428 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
431 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
433 Handshake(session, user);
436 void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
438 issl_session* session = &sessions[user->GetFd()];
440 /* For STARTTLS: Don't try and init a session on a socket that already has a session */
444 InitSession(user, true);
447 void OnStreamSocketConnect(StreamSocket* user)
449 InitSession(user, false);
452 void OnStreamSocketClose(StreamSocket* user)
454 CloseSession(&sessions[user->GetFd()]);
457 int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
459 issl_session* session = &sessions[user->GetFd()];
463 CloseSession(session);
464 user->SetError("No SSL session");
468 if (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE)
470 // The handshake isn't finished, try to finish it.
472 if(!Handshake(session, user))
474 if (session->status != ISSL_CLOSING)
480 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
482 if (session->status == ISSL_HANDSHAKEN)
484 char* buffer = ServerInstance->GetReadBuffer();
485 size_t bufsiz = ServerInstance->Config->NetBufferSize;
486 int ret = gnutls_record_recv(session->sess, buffer, bufsiz);
489 recvq.append(buffer, ret);
492 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
498 user->SetError("SSL Connection closed");
499 CloseSession(session);
504 user->SetError(gnutls_strerror(ret));
505 CloseSession(session);
509 else if (session->status == ISSL_CLOSING)
515 int OnStreamSocketWrite(StreamSocket* user, std::string& sendq)
517 issl_session* session = &sessions[user->GetFd()];
521 CloseSession(session);
522 user->SetError("No SSL session");
526 if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ)
528 // The handshake isn't finished, try to finish it.
529 Handshake(session, user);
530 if (session->status != ISSL_CLOSING)
537 if (session->status == ISSL_HANDSHAKEN)
539 ret = gnutls_record_send(session->sess, sendq.data(), sendq.length());
541 if (ret == (int)sendq.length())
543 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE);
548 sendq = sendq.substr(ret);
549 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
552 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
554 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
559 user->SetError(gnutls_strerror(ret));
560 CloseSession(session);
568 bool Handshake(issl_session* session, StreamSocket* user)
570 int ret = gnutls_handshake(session->sess);
574 if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
576 // Handshake needs resuming later, read() or write() would have blocked.
578 if(gnutls_record_get_direction(session->sess) == 0)
580 // gnutls_handshake() wants to read() again.
581 session->status = ISSL_HANDSHAKING_READ;
582 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
586 // gnutls_handshake() wants to write() again.
587 session->status = ISSL_HANDSHAKING_WRITE;
588 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
593 user->SetError(std::string("Handshake Failed - ") + gnutls_strerror(ret));
594 CloseSession(session);
595 session->status = ISSL_CLOSING;
602 // Change the seesion state
603 session->status = ISSL_HANDSHAKEN;
605 VerifyCertificate(session,user);
607 // Finish writing, if any left
608 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
614 void OnUserConnect(LocalUser* user)
616 if (user->eh.GetIOHook() == this)
618 if (sessions[user->eh.GetFd()].sess)
620 ssl_cert* cert = sessions[user->eh.GetFd()].cert;
621 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->eh.GetFd()].sess));
622 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->eh.GetFd()].sess))).append("-");
623 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->eh.GetFd()].sess)));
624 if (cert->fingerprint.empty())
625 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), cipher.c_str());
627 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\""
628 " and your SSL fingerprint is %s", user->nick.c_str(), cipher.c_str(), cert->fingerprint.c_str());
633 void CloseSession(issl_session* session)
637 gnutls_bye(session->sess, GNUTLS_SHUT_WR);
638 gnutls_deinit(session->sess);
640 session->sess = NULL;
641 session->cert = NULL;
642 session->status = ISSL_NONE;
645 void VerifyCertificate(issl_session* session, StreamSocket* user)
647 if (!session->sess || !user)
651 const gnutls_datum_t* cert_list;
653 unsigned int cert_list_size;
654 gnutls_x509_crt_t cert;
656 unsigned char digest[MAXBUF];
657 size_t digest_size = sizeof(digest);
658 size_t name_size = sizeof(name);
659 ssl_cert* certinfo = new ssl_cert;
660 session->cert = certinfo;
662 /* This verification function uses the trusted CAs in the credentials
663 * structure. So you must have installed one or more CA certificates.
665 ret = gnutls_certificate_verify_peers2(session->sess, &status);
669 certinfo->error = std::string(gnutls_strerror(ret));
673 certinfo->invalid = (status & GNUTLS_CERT_INVALID);
674 certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND);
675 certinfo->revoked = (status & GNUTLS_CERT_REVOKED);
676 certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA);
678 /* Up to here the process is the same for X.509 certificates and
679 * OpenPGP keys. From now on X.509 certificates are assumed. This can
680 * be easily extended to work with openpgp keys as well.
682 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
684 certinfo->error = "No X509 keys sent";
688 ret = gnutls_x509_crt_init(&cert);
691 certinfo->error = gnutls_strerror(ret);
696 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
697 if (cert_list == NULL)
699 certinfo->error = "No certificate was found";
700 goto info_done_dealloc;
703 /* This is not a real world example, since we only check the first
704 * certificate in the given chain.
707 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
710 certinfo->error = gnutls_strerror(ret);
711 goto info_done_dealloc;
714 gnutls_x509_crt_get_dn(cert, name, &name_size);
717 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
718 certinfo->issuer = name;
720 if ((ret = gnutls_x509_crt_get_fingerprint(cert, hash, digest, &digest_size)) < 0)
722 certinfo->error = gnutls_strerror(ret);
726 certinfo->fingerprint = irc::hex(digest, digest_size);
729 /* Beware here we do not check for errors.
731 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
733 certinfo->error = "Not activated, or expired certificate";
737 gnutls_x509_crt_deinit(cert);
740 void OnEvent(Event& ev)
742 if (starttls.enabled)
743 capHandler.HandleEvent(ev);
747 MODULE_INIT(ModuleSSLGnuTLS)