1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2007 InspIRCd Development Team
6 * See: http://www.inspircd.org/wiki/index.php/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
16 #include <gnutls/gnutls.h>
17 #include <gnutls/x509.h>
19 #include "inspircd_config.h"
20 #include "configreader.h"
26 #include "transport.h"
29 #pragma comment(lib, "libgnutls-13.lib")
30 #undef MAX_DESCRIPTORS
31 #define MAX_DESCRIPTORS 10000
34 /* $ModDesc: Provides SSL support for clients */
35 /* $CompileFlags: exec("libgnutls-config --cflags") */
36 /* $LinkerFlags: rpath("libgnutls-config --libs") exec("libgnutls-config --libs") */
37 /* $ModDep: transport.h */
40 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
42 bool isin(int port, const std::vector<int> &portlist)
44 for(unsigned int i = 0; i < portlist.size(); i++)
45 if(portlist[i] == port)
51 /** Represents an SSL user's extra data
53 class issl_session : public classbase
56 gnutls_session_t sess;
64 class ModuleSSLGnuTLS : public Module
71 std::vector<int> listenports;
74 issl_session sessions[MAX_DESCRIPTORS];
76 gnutls_certificate_credentials x509_cred;
77 gnutls_dh_params dh_params;
90 ModuleSSLGnuTLS(InspIRCd* Me)
93 ServerInstance->PublishInterface("InspSocketHook", this);
95 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
96 inbufsize = ServerInstance->Config->NetBufferSize;
98 gnutls_global_init(); // This must be called once in the program
100 if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
101 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
103 // Guessing return meaning
104 if(gnutls_dh_params_init(&dh_params) < 0)
105 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters");
107 // Needs the flag as it ignores a plain /rehash
108 OnRehash(NULL,"ssl");
110 // Void return, guess we assume success
111 gnutls_certificate_set_dh_params(x509_cred, dh_params);
114 virtual void OnRehash(userrec* user, const std::string ¶m)
119 Conf = new ConfigReader(ServerInstance);
121 for(unsigned int i = 0; i < listenports.size(); i++)
123 ServerInstance->Config->DelIOHook(listenports[i]);
130 for(int i = 0; i < Conf->Enumerate("bind"); i++)
132 // For each <bind> tag
133 std::string x = Conf->ReadValue("bind", "type", i);
134 if(((x.empty()) || (x == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "gnutls"))
136 // Get the port we're meant to be listening on with SSL
137 std::string port = Conf->ReadValue("bind", "port", i);
138 irc::portparser portrange(port, false);
140 while ((portno = portrange.GetToken()))
145 if (ServerInstance->Config->AddIOHook(portno, this))
147 listenports.push_back(portno);
148 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
149 if (ServerInstance->Config->ports[i]->GetPort() == portno)
150 ServerInstance->Config->ports[i]->SetDescription("ssl");
151 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portno);
152 sslports.append("*:").append(ConvToStr(portno)).append(";");
156 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
159 catch (ModuleException &e)
161 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d: %s. Maybe it's already hooked by the same port on a different IP, or you have an other SSL or similar module loaded?", portno, e.GetReason());
167 std::string confdir(ServerInstance->ConfigFileName);
168 // +1 so we the path ends with a /
169 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
171 cafile = Conf->ReadValue("gnutls", "cafile", 0);
172 crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
173 certfile = Conf->ReadValue("gnutls", "certfile", 0);
174 keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
175 dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
177 // Set all the default values needed.
184 if (certfile.empty())
185 certfile = "cert.pem";
190 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
193 // Prepend relative paths with the path to the config directory.
195 cafile = confdir + cafile;
197 if(crlfile[0] != '/')
198 crlfile = confdir + crlfile;
200 if(certfile[0] != '/')
201 certfile = confdir + certfile;
203 if(keyfile[0] != '/')
204 keyfile = confdir + keyfile;
208 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
209 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
211 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
212 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
214 // Guessing on the return value of this, manual doesn't say :|
215 if((ret = gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
216 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 certificate and key files '%s' and '%s': %s", certfile.c_str(), keyfile.c_str(), gnutls_strerror(ret));
218 // This may be on a large (once a day or week) timer eventually.
224 void GenerateDHParams()
226 // Generate Diffie Hellman parameters - for use with DHE
227 // kx algorithms. These should be discarded and regenerated
228 // once a day, once a week or once a month. Depending on the
229 // security requirements.
233 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
234 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
237 virtual ~ModuleSSLGnuTLS()
239 gnutls_dh_params_deinit(dh_params);
240 gnutls_certificate_free_credentials(x509_cred);
241 gnutls_global_deinit();
244 virtual void OnCleanup(int target_type, void* item)
246 if(target_type == TYPE_USER)
248 userrec* user = (userrec*)item;
250 if(user->GetExt("ssl", dummy) && isin(user->GetPort(), listenports))
252 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
253 // Potentially there could be multiple SSL modules loaded at once on different ports.
254 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
256 if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
259 user->GetExt("ssl_cert", tofree);
261 user->Shrink("ssl_cert");
266 virtual void OnUnloadModule(Module* mod, const std::string &name)
270 for(unsigned int i = 0; i < listenports.size(); i++)
272 ServerInstance->Config->DelIOHook(listenports[i]);
273 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
274 if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
275 ServerInstance->Config->ports[j]->SetDescription("plaintext");
280 virtual Version GetVersion()
282 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
285 void Implements(char* List)
287 List[I_On005Numeric] = List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
288 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
291 virtual void On005Numeric(std::string &output)
293 output.append(" SSL=" + sslports);
296 virtual char* OnRequest(Request* request)
298 ISHRequest* ISR = (ISHRequest*)request;
299 if (strcmp("IS_NAME", request->GetId()) == 0)
303 else if (strcmp("IS_HOOK", request->GetId()) == 0)
308 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
310 catch (ModuleException &e)
316 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
318 return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
320 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
322 if (ISR->Sock->GetFd() < 0)
325 issl_session* session = &sessions[ISR->Sock->GetFd()];
326 return (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) ? NULL : (char*)"OK";
328 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
330 if (ISR->Sock->GetFd() > -1)
332 issl_session* session = &sessions[ISR->Sock->GetFd()];
335 if ((Extensible*)ServerInstance->FindDescriptor(ISR->Sock->GetFd()) == (Extensible*)(ISR->Sock))
337 VerifyCertificate(session, (InspSocket*)ISR->Sock);
347 virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
349 issl_session* session = &sessions[fd];
352 session->inbuf = new char[inbufsize];
353 session->inbufoffset = 0;
355 gnutls_init(&session->sess, GNUTLS_SERVER);
357 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
358 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
359 gnutls_dh_set_prime_bits(session->sess, dh_bits);
361 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
362 * This needs testing, but it's easy enough to rollback if need be
363 * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
364 * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
366 * With testing this seems to...not work :/
369 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
371 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
376 virtual void OnRawSocketConnect(int fd)
378 issl_session* session = &sessions[fd];
381 session->inbuf = new char[inbufsize];
382 session->inbufoffset = 0;
384 gnutls_init(&session->sess, GNUTLS_CLIENT);
386 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
387 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
388 gnutls_dh_set_prime_bits(session->sess, dh_bits);
389 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
394 virtual void OnRawSocketClose(int fd)
396 CloseSession(&sessions[fd]);
398 EventHandler* user = ServerInstance->SE->GetRef(fd);
400 if ((user) && (user->GetExt("ssl_cert", dummy)))
403 user->GetExt("ssl_cert", tofree);
405 user->Shrink("ssl_cert");
409 virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
411 issl_session* session = &sessions[fd];
416 CloseSession(session);
420 if (session->status == ISSL_HANDSHAKING_READ)
422 // The handshake isn't finished, try to finish it.
424 if(!Handshake(session))
426 // Couldn't resume handshake.
430 else if (session->status == ISSL_HANDSHAKING_WRITE)
436 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
438 if (session->status == ISSL_HANDSHAKEN)
440 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
441 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
442 int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
446 // Client closed connection.
448 CloseSession(session);
453 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
461 CloseSession(session);
466 // Read successfully 'ret' bytes into inbuf + inbufoffset
467 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
468 // 'buffer' is 'count' long
470 unsigned int length = ret + session->inbufoffset;
474 memcpy(buffer, session->inbuf, count);
475 // Move the stuff left in inbuf to the beginning of it
476 memcpy(session->inbuf, session->inbuf + count, (length - count));
477 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
478 session->inbufoffset = length - count;
479 // Insp uses readresult as the count of how much data there is in buffer, so:
484 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
485 memcpy(buffer, session->inbuf, length);
486 // Zero the offset, as there's nothing there..
487 session->inbufoffset = 0;
493 else if(session->status == ISSL_CLOSING)
499 virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
504 issl_session* session = &sessions[fd];
505 const char* sendbuffer = buffer;
509 ServerInstance->Log(DEBUG,"No session");
510 CloseSession(session);
514 session->outbuf.append(sendbuffer, count);
515 sendbuffer = session->outbuf.c_str();
516 count = session->outbuf.size();
518 if (session->status == ISSL_HANDSHAKING_WRITE)
520 // The handshake isn't finished, try to finish it.
521 ServerInstance->Log(DEBUG,"Finishing handshake");
529 if (session->status == ISSL_HANDSHAKEN)
531 ServerInstance->Log(DEBUG,"Send record");
532 ret = gnutls_record_send(session->sess, sendbuffer, count);
533 ServerInstance->Log(DEBUG,"Return: %d", ret);
537 CloseSession(session);
541 if(ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)
543 ServerInstance->Log(DEBUG,"Not egain or interrupt, close session");
544 CloseSession(session);
548 ServerInstance->Log(DEBUG,"Again please");
555 ServerInstance->Log(DEBUG,"Trim buffer");
556 session->outbuf = session->outbuf.substr(ret);
560 /* Who's smart idea was it to return 1 when we havent written anything?
561 * This fucks the buffer up in InspSocket :p
563 return ret < 1 ? 0 : ret;
566 // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
567 virtual void OnWhois(userrec* source, userrec* dest)
572 // Bugfix, only send this numeric for *our* SSL users
573 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) && isin(dest->GetPort(), listenports)))
575 ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
579 virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
581 // check if the linking module wants to know about OUR metadata
584 // check if this user has an swhois field to send
585 if(user->GetExt(extname, dummy))
587 // call this function in the linking module, let it format the data how it
588 // sees fit, and send it on its way. We dont need or want to know how.
589 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
594 virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
596 // check if its our metadata key, and its associated with a user
597 if ((target_type == TYPE_USER) && (extname == "ssl"))
599 userrec* dest = (userrec*)target;
600 // if they dont already have an ssl flag, accept the remote server's
601 if (!dest->GetExt(extname, dummy))
603 dest->Extend(extname, "ON");
608 bool Handshake(issl_session* session)
610 int ret = gnutls_handshake(session->sess);
614 if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
616 // Handshake needs resuming later, read() or write() would have blocked.
618 if(gnutls_record_get_direction(session->sess) == 0)
620 // gnutls_handshake() wants to read() again.
621 session->status = ISSL_HANDSHAKING_READ;
625 // gnutls_handshake() wants to write() again.
626 session->status = ISSL_HANDSHAKING_WRITE;
627 MakePollWrite(session);
633 CloseSession(session);
634 session->status = ISSL_CLOSING;
641 // Handshake complete.
642 // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
643 userrec* extendme = ServerInstance->FindDescriptor(session->fd);
646 if (!extendme->GetExt("ssl", dummy))
647 extendme->Extend("ssl", "ON");
650 // Change the seesion state
651 session->status = ISSL_HANDSHAKEN;
653 // Finish writing, if any left
654 MakePollWrite(session);
660 virtual void OnPostConnect(userrec* user)
662 // This occurs AFTER OnUserConnect so we can be sure the
663 // protocol module has propogated the NICK message.
664 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
666 // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
667 std::deque<std::string>* metadata = new std::deque<std::string>;
668 metadata->push_back(user->nick);
669 metadata->push_back("ssl"); // The metadata id
670 metadata->push_back("ON"); // The value to send
671 Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
672 event->Send(ServerInstance); // Trigger the event. We don't care what module picks it up.
676 VerifyCertificate(&sessions[user->GetFd()],user);
677 if (sessions[user->GetFd()].sess)
679 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
680 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
681 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
682 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, cipher.c_str());
687 void MakePollWrite(issl_session* session)
689 OnRawSocketWrite(session->fd, NULL, 0);
692 void CloseSession(issl_session* session)
696 gnutls_bye(session->sess, GNUTLS_SHUT_WR);
697 gnutls_deinit(session->sess);
702 delete[] session->inbuf;
705 session->outbuf.clear();
706 session->inbuf = NULL;
707 session->sess = NULL;
708 session->status = ISSL_NONE;
711 void VerifyCertificate(issl_session* session, Extensible* user)
713 if (!session->sess || !user)
717 const gnutls_datum_t* cert_list;
719 unsigned int cert_list_size;
720 gnutls_x509_crt_t cert;
722 unsigned char digest[MAXBUF];
723 size_t digest_size = sizeof(digest);
724 size_t name_size = sizeof(name);
725 ssl_cert* certinfo = new ssl_cert;
727 user->Extend("ssl_cert",certinfo);
729 /* This verification function uses the trusted CAs in the credentials
730 * structure. So you must have installed one or more CA certificates.
732 ret = gnutls_certificate_verify_peers2(session->sess, &status);
736 certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
740 if (status & GNUTLS_CERT_INVALID)
742 certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
746 certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
748 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
750 certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
754 certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
756 if (status & GNUTLS_CERT_REVOKED)
758 certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
762 certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
764 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
766 certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
770 certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
773 /* Up to here the process is the same for X.509 certificates and
774 * OpenPGP keys. From now on X.509 certificates are assumed. This can
775 * be easily extended to work with openpgp keys as well.
777 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
779 certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
783 ret = gnutls_x509_crt_init(&cert);
786 certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
791 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
792 if (cert_list == NULL)
794 certinfo->data.insert(std::make_pair("error","No certificate was found"));
798 /* This is not a real world example, since we only check the first
799 * certificate in the given chain.
802 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
805 certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
809 gnutls_x509_crt_get_dn(cert, name, &name_size);
811 certinfo->data.insert(std::make_pair("dn",name));
813 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
815 certinfo->data.insert(std::make_pair("issuer",name));
817 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
819 certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
823 certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
826 /* Beware here we do not check for errors.
828 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
830 certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
833 gnutls_x509_crt_deinit(cert);
840 MODULE_INIT(ModuleSSLGnuTLS);