src/modules/extra/m_ssl_gnutls.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #include <gnutls/gnutls.h>
  17 #include <gnutls/x509.h>
  18
  19 #include "inspircd_config.h"
  20 #include "configreader.h"
  21 #include "users.h"
  22 #include "channels.h"
  23 #include "modules.h"
  24 #include "socket.h"
  25 #include "hashcomp.h"
  26 #include "transport.h"
  27
  28 #ifdef WINDOWS
  29 #pragma comment(lib, "libgnutls-13.lib")
  30 #undef MAX_DESCRIPTORS
  31 #define MAX_DESCRIPTORS 10000
  32 #endif
  33
  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 */
  38
  39
  40 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  41
  42 bool isin(int port, const std::vector<int> &portlist)
  43 {
  44         for(unsigned int i = 0; i < portlist.size(); i++)
  45                 if(portlist[i] == port)
  46                         return true;
  47
  48         return false;
  49 }
  50
  51 /** Represents an SSL user's extra data
  52  */
  53 class issl_session : public classbase
  54 {
  55 public:
  56         gnutls_session_t sess;
  57         issl_status status;
  58         std::string outbuf;
  59         int inbufoffset;
  60         char* inbuf;
  61         int fd;
  62 };
  63
  64 class ModuleSSLGnuTLS : public Module
  65 {
  66
  67         ConfigReader* Conf;
  68
  69         char* dummy;
  70
  71         std::vector<int> listenports;
  72
  73         int inbufsize;
  74         issl_session sessions[MAX_DESCRIPTORS];
  75
  76         gnutls_certificate_credentials x509_cred;
  77         gnutls_dh_params dh_params;
  78
  79         std::string keyfile;
  80         std::string certfile;
  81         std::string cafile;
  82         std::string crlfile;
  83         int dh_bits;
  84
  85         int clientactive;
  86
  87  public:
  88
  89         ModuleSSLGnuTLS(InspIRCd* Me)
  90                 : Module(Me)
  91         {
  92                 ServerInstance->PublishInterface("InspSocketHook", this);
  93
  94                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
  95                 inbufsize = ServerInstance->Config->NetBufferSize;
  96
  97                 gnutls_global_init(); // This must be called once in the program
  98
  99                 if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
 100                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
 101
 102                 // Guessing return meaning
 103                 if(gnutls_dh_params_init(&dh_params) < 0)
 104                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters");
 105
 106                 // Needs the flag as it ignores a plain /rehash
 107                 OnRehash(NULL,"ssl");
 108
 109                 // Void return, guess we assume success
 110                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 111         }
 112
 113         virtual void OnRehash(userrec* user, const std::string &param)
 114         {
 115                 if(param != "ssl")
 116                         return;
 117
 118                 Conf = new ConfigReader(ServerInstance);
 119
 120                 for(unsigned int i = 0; i < listenports.size(); i++)
 121                 {
 122                         ServerInstance->Config->DelIOHook(listenports[i]);
 123                 }
 124
 125                 listenports.clear();
 126                 clientactive = 0;
 127
 128                 for(int i = 0; i < Conf->Enumerate("bind"); i++)
 129                 {
 130                         // For each <bind> tag
 131                         if(((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "gnutls"))
 132                         {
 133                                 // Get the port we're meant to be listening on with SSL
 134                                 std::string port = Conf->ReadValue("bind", "port", i);
 135                                 irc::portparser portrange(port, false);
 136                                 long portno = -1;
 137                                 while ((portno = portrange.GetToken()))
 138                                 {
 139                                         clientactive++;
 140                                         try
 141                                         {
 142                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 143                                                 {
 144                                                         listenports.push_back(portno);
 145                                                         for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 146                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 147                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 148                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portno);
 149                                                 }
 150                                                 else
 151                                                 {
 152                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 153                                                 }
 154                                         }
 155                                         catch (ModuleException &e)
 156                                         {
 157                                                 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());
 158                                         }
 159                                 }
 160                         }
 161                 }
 162
 163                 std::string confdir(ServerInstance->ConfigFileName);
 164                 // +1 so we the path ends with a /
 165                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 166
 167                 cafile  = Conf->ReadValue("gnutls", "cafile", 0);
 168                 crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
 169                 certfile        = Conf->ReadValue("gnutls", "certfile", 0);
 170                 keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
 171                 dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
 172
 173                 // Set all the default values needed.
 174                 if(cafile == "")
 175                         cafile = "ca.pem";
 176
 177                 if(crlfile == "")
 178                         crlfile = "crl.pem";
 179
 180                 if(certfile == "")
 181                         certfile = "cert.pem";
 182
 183                 if(keyfile == "")
 184                         keyfile = "key.pem";
 185
 186                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 187                         dh_bits = 1024;
 188
 189                 // Prepend relative paths with the path to the config directory.
 190                 if(cafile[0] != '/')
 191                         cafile = confdir + cafile;
 192
 193                 if(crlfile[0] != '/')
 194                         crlfile = confdir + crlfile;
 195
 196                 if(certfile[0] != '/')
 197                         certfile = confdir + certfile;
 198
 199                 if(keyfile[0] != '/')
 200                         keyfile = confdir + keyfile;
 201
 202                 int ret;
 203
 204                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 205                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
 206
 207                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 208                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
 209
 210                 // Guessing on the return value of this, manual doesn't say :|
 211                 if((ret = gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 212                         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));
 213
 214                 // This may be on a large (once a day or week) timer eventually.
 215                 GenerateDHParams();
 216
 217                 DELETE(Conf);
 218         }
 219
 220         void GenerateDHParams()
 221         {
 222                 // Generate Diffie Hellman parameters - for use with DHE
 223                 // kx algorithms. These should be discarded and regenerated
 224                 // once a day, once a week or once a month. Depending on the
 225                 // security requirements.
 226
 227                 int ret;
 228
 229                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 230                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 231         }
 232
 233         virtual ~ModuleSSLGnuTLS()
 234         {
 235                 gnutls_dh_params_deinit(dh_params);
 236                 gnutls_certificate_free_credentials(x509_cred);
 237                 gnutls_global_deinit();
 238         }
 239
 240         virtual void OnCleanup(int target_type, void* item)
 241         {
 242                 if(target_type == TYPE_USER)
 243                 {
 244                         userrec* user = (userrec*)item;
 245
 246                         if(user->GetExt("ssl", dummy) && isin(user->GetPort(), listenports))
 247                         {
 248                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 249                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 250                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 251                         }
 252                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 253                         {
 254                                 ssl_cert* tofree;
 255                                 user->GetExt("ssl_cert", tofree);
 256                                 delete tofree;
 257                                 user->Shrink("ssl_cert");
 258                         }
 259                 }
 260         }
 261
 262         virtual void OnUnloadModule(Module* mod, const std::string &name)
 263         {
 264                 if(mod == this)
 265                 {
 266                         for(unsigned int i = 0; i < listenports.size(); i++)
 267                         {
 268                                 ServerInstance->Config->DelIOHook(listenports[i]);
 269                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 270                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 271                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 272                         }
 273                 }
 274         }
 275
 276         virtual Version GetVersion()
 277         {
 278                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 279         }
 280
 281         void Implements(char* List)
 282         {
 283                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 284                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 285         }
 286
 287         virtual char* OnRequest(Request* request)
 288         {
 289                 ISHRequest* ISR = (ISHRequest*)request;
 290                 if (strcmp("IS_NAME", request->GetId()) == 0)
 291                 {
 292                         return "gnutls";
 293                 }
 294                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 295                 {
 296                         char* ret = "OK";
 297                         try
 298                         {
 299                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 300                         }
 301                         catch (ModuleException &e)
 302                         {
 303                                 return NULL;
 304                         }
 305                         return ret;
 306                 }
 307                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 308                 {
 309                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 310                 }
 311                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 312                 {
 313                         if (ISR->Sock->GetFd() < 0)
 314                                 return (char*)"OK";
 315
 316                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 317                         return (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) ? NULL : (char*)"OK";
 318                 }
 319                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 320                 {
 321                         if (ISR->Sock->GetFd() > -1)
 322                         {
 323                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 324                                 if (session->sess)
 325                                 {
 326                                         if ((Extensible*)ServerInstance->FindDescriptor(ISR->Sock->GetFd()) == (Extensible*)(ISR->Sock))
 327                                         {
 328                                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 329                                                 return "OK";
 330                                         }
 331                                 }
 332                         }
 333                 }
 334                 return NULL;
 335         }
 336
 337
 338         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 339         {
 340                 issl_session* session = &sessions[fd];
 341
 342                 session->fd = fd;
 343                 session->inbuf = new char[inbufsize];
 344                 session->inbufoffset = 0;
 345
 346                 gnutls_init(&session->sess, GNUTLS_SERVER);
 347
 348                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 349                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 350                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 351
 352                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 353                  * This needs testing, but it's easy enough to rollback if need be
 354                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 355                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 356                  *
 357                  * With testing this seems to...not work :/
 358                  */
 359
 360                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 361
 362                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 363
 364                 Handshake(session);
 365         }
 366
 367         virtual void OnRawSocketConnect(int fd)
 368         {
 369                 issl_session* session = &sessions[fd];
 370
 371                 session->fd = fd;
 372                 session->inbuf = new char[inbufsize];
 373                 session->inbufoffset = 0;
 374
 375                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 376
 377                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 378                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 379                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 380                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 381
 382                 Handshake(session);
 383         }
 384
 385         virtual void OnRawSocketClose(int fd)
 386         {
 387                 CloseSession(&sessions[fd]);
 388
 389                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 390
 391                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 392                 {
 393                         ssl_cert* tofree;
 394                         user->GetExt("ssl_cert", tofree);
 395                         delete tofree;
 396                         user->Shrink("ssl_cert");
 397                 }
 398         }
 399
 400         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 401         {
 402                 issl_session* session = &sessions[fd];
 403
 404                 if (!session->sess)
 405                 {
 406                         readresult = 0;
 407                         CloseSession(session);
 408                         return 1;
 409                 }
 410
 411                 if (session->status == ISSL_HANDSHAKING_READ)
 412                 {
 413                         // The handshake isn't finished, try to finish it.
 414
 415                         if(!Handshake(session))
 416                         {
 417                                 // Couldn't resume handshake.
 418                                 return -1;
 419                         }
 420                 }
 421                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 422                 {
 423                         errno = EAGAIN;
 424                         return -1;
 425                 }
 426
 427                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 428
 429                 if (session->status == ISSL_HANDSHAKEN)
 430                 {
 431                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 432                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 433                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 434
 435                         if (ret == 0)
 436                         {
 437                                 // Client closed connection.
 438                                 readresult = 0;
 439                                 CloseSession(session);
 440                                 return 1;
 441                         }
 442                         else if (ret < 0)
 443                         {
 444                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 445                                 {
 446                                         errno = EAGAIN;
 447                                         return -1;
 448                                 }
 449                                 else
 450                                 {
 451                                         readresult = 0;
 452                                         CloseSession(session);
 453                                 }
 454                         }
 455                         else
 456                         {
 457                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 458                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 459                                 // 'buffer' is 'count' long
 460
 461                                 unsigned int length = ret + session->inbufoffset;
 462
 463                                 if(count <= length)
 464                                 {
 465                                         memcpy(buffer, session->inbuf, count);
 466                                         // Move the stuff left in inbuf to the beginning of it
 467                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 468                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 469                                         session->inbufoffset = length - count;
 470                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 471                                         readresult = count;
 472                                 }
 473                                 else
 474                                 {
 475                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 476                                         memcpy(buffer, session->inbuf, length);
 477                                         // Zero the offset, as there's nothing there..
 478                                         session->inbufoffset = 0;
 479                                         // As above
 480                                         readresult = length;
 481                                 }
 482                         }
 483                 }
 484                 else if(session->status == ISSL_CLOSING)
 485                         readresult = 0;
 486
 487                 return 1;
 488         }
 489
 490         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 491         {
 492                 if (!count)
 493                         return 0;
 494
 495                 issl_session* session = &sessions[fd];
 496                 const char* sendbuffer = buffer;
 497
 498                 if (!session->sess)
 499                 {
 500                         CloseSession(session);
 501                         return 1;
 502                 }
 503
 504                 session->outbuf.append(sendbuffer, count);
 505                 sendbuffer = session->outbuf.c_str();
 506                 count = session->outbuf.size();
 507
 508                 if(session->status == ISSL_HANDSHAKING_WRITE)
 509                 {
 510                         // The handshake isn't finished, try to finish it.
 511                         Handshake(session);
 512                         errno = EAGAIN;
 513                         return -1;
 514                 }
 515
 516                 int ret = 0;
 517
 518                 if(session->status == ISSL_HANDSHAKEN)
 519                 {
 520                         ret = gnutls_record_send(session->sess, sendbuffer, count);
 521
 522                         if(ret == 0)
 523                         {
 524                                 CloseSession(session);
 525                         }
 526                         else if (ret < 0)
 527                         {
 528                                 if(ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)
 529                                 {
 530                                         CloseSession(session);
 531                                 }
 532                                 else
 533                                 {
 534                                         errno = EAGAIN;
 535                                         return -1;
 536                                 }
 537                         }
 538                         else
 539                         {
 540                                 session->outbuf = session->outbuf.substr(ret);
 541                         }
 542                 }
 543
 544                 /* Who's smart idea was it to return 1 when we havent written anything?
 545                  * This fucks the buffer up in InspSocket :p
 546                  */
 547                 return ret < 1 ? 0 : ret;
 548         }
 549
 550         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 551         virtual void OnWhois(userrec* source, userrec* dest)
 552         {
 553                 if (!clientactive)
 554                         return;
 555
 556                 // Bugfix, only send this numeric for *our* SSL users
 557                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 558                 {
 559                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 560                 }
 561         }
 562
 563         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 564         {
 565                 // check if the linking module wants to know about OUR metadata
 566                 if(extname == "ssl")
 567                 {
 568                         // check if this user has an swhois field to send
 569                         if(user->GetExt(extname, dummy))
 570                         {
 571                                 // call this function in the linking module, let it format the data how it
 572                                 // sees fit, and send it on its way. We dont need or want to know how.
 573                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 574                         }
 575                 }
 576         }
 577
 578         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 579         {
 580                 // check if its our metadata key, and its associated with a user
 581                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 582                 {
 583                         userrec* dest = (userrec*)target;
 584                         // if they dont already have an ssl flag, accept the remote server's
 585                         if (!dest->GetExt(extname, dummy))
 586                         {
 587                                 dest->Extend(extname, "ON");
 588                         }
 589                 }
 590         }
 591
 592         bool Handshake(issl_session* session)
 593         {
 594                 int ret = gnutls_handshake(session->sess);
 595
 596                 if (ret < 0)
 597                 {
 598                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 599                         {
 600                                 // Handshake needs resuming later, read() or write() would have blocked.
 601
 602                                 if(gnutls_record_get_direction(session->sess) == 0)
 603                                 {
 604                                         // gnutls_handshake() wants to read() again.
 605                                         session->status = ISSL_HANDSHAKING_READ;
 606                                 }
 607                                 else
 608                                 {
 609                                         // gnutls_handshake() wants to write() again.
 610                                         session->status = ISSL_HANDSHAKING_WRITE;
 611                                         MakePollWrite(session);
 612                                 }
 613                         }
 614                         else
 615                         {
 616                                 // Handshake failed.
 617                                 CloseSession(session);
 618                                 session->status = ISSL_CLOSING;
 619                         }
 620
 621                         return false;
 622                 }
 623                 else
 624                 {
 625                         // Handshake complete.
 626                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 627                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 628                         if (extendme)
 629                         {
 630                                 if (!extendme->GetExt("ssl", dummy))
 631                                         extendme->Extend("ssl", "ON");
 632                         }
 633
 634                         // Change the seesion state
 635                         session->status = ISSL_HANDSHAKEN;
 636
 637                         // Finish writing, if any left
 638                         MakePollWrite(session);
 639
 640                         return true;
 641                 }
 642         }
 643
 644         virtual void OnPostConnect(userrec* user)
 645         {
 646                 // This occurs AFTER OnUserConnect so we can be sure the
 647                 // protocol module has propogated the NICK message.
 648                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 649                 {
 650                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 651                         std::deque<std::string>* metadata = new std::deque<std::string>;
 652                         metadata->push_back(user->nick);
 653                         metadata->push_back("ssl");             // The metadata id
 654                         metadata->push_back("ON");              // The value to send
 655                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 656                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 657                         DELETE(event);
 658                         DELETE(metadata);
 659
 660                         VerifyCertificate(&sessions[user->GetFd()],user);
 661                         if (sessions[user->GetFd()].sess)
 662                         {
 663                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 664                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 665                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 666                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, cipher.c_str());
 667                         }
 668                 }
 669         }
 670
 671         void MakePollWrite(issl_session* session)
 672         {
 673                 OnRawSocketWrite(session->fd, NULL, 0);
 674         }
 675
 676         void CloseSession(issl_session* session)
 677         {
 678                 if(session->sess)
 679                 {
 680                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 681                         gnutls_deinit(session->sess);
 682                 }
 683
 684                 if(session->inbuf)
 685                 {
 686                         delete[] session->inbuf;
 687                 }
 688
 689                 session->outbuf.clear();
 690                 session->inbuf = NULL;
 691                 session->sess = NULL;
 692                 session->status = ISSL_NONE;
 693         }
 694
 695         void VerifyCertificate(issl_session* session, Extensible* user)
 696         {
 697                 if (!session->sess || !user)
 698                         return;
 699
 700                 unsigned int status;
 701                 const gnutls_datum_t* cert_list;
 702                 int ret;
 703                 unsigned int cert_list_size;
 704                 gnutls_x509_crt_t cert;
 705                 char name[MAXBUF];
 706                 unsigned char digest[MAXBUF];
 707                 size_t digest_size = sizeof(digest);
 708                 size_t name_size = sizeof(name);
 709                 ssl_cert* certinfo = new ssl_cert;
 710
 711                 user->Extend("ssl_cert",certinfo);
 712
 713                 /* This verification function uses the trusted CAs in the credentials
 714                  * structure. So you must have installed one or more CA certificates.
 715                  */
 716                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 717
 718                 if (ret < 0)
 719                 {
 720                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 721                         return;
 722                 }
 723
 724                 if (status & GNUTLS_CERT_INVALID)
 725                 {
 726                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 727                 }
 728                 else
 729                 {
 730                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 731                 }
 732                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 733                 {
 734                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 735                 }
 736                 else
 737                 {
 738                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 739                 }
 740                 if (status & GNUTLS_CERT_REVOKED)
 741                 {
 742                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 743                 }
 744                 else
 745                 {
 746                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 747                 }
 748                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 749                 {
 750                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 751                 }
 752                 else
 753                 {
 754                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 755                 }
 756
 757                 /* Up to here the process is the same for X.509 certificates and
 758                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 759                  * be easily extended to work with openpgp keys as well.
 760                  */
 761                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 762                 {
 763                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 764                         return;
 765                 }
 766
 767                 ret = gnutls_x509_crt_init(&cert);
 768                 if (ret < 0)
 769                 {
 770                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 771                         return;
 772                 }
 773
 774                 cert_list_size = 0;
 775                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 776                 if (cert_list == NULL)
 777                 {
 778                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 779                         return;
 780                 }
 781
 782                 /* This is not a real world example, since we only check the first
 783                  * certificate in the given chain.
 784                  */
 785
 786                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 787                 if (ret < 0)
 788                 {
 789                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 790                         return;
 791                 }
 792
 793                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 794
 795                 certinfo->data.insert(std::make_pair("dn",name));
 796
 797                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 798
 799                 certinfo->data.insert(std::make_pair("issuer",name));
 800
 801                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 802                 {
 803                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 804                 }
 805                 else
 806                 {
 807                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 808                 }
 809
 810                 /* Beware here we do not check for errors.
 811                  */
 812                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 813                 {
 814                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 815                 }
 816
 817                 gnutls_x509_crt_deinit(cert);
 818
 819                 return;
 820         }
 821
 822 };
 823
 824 class ModuleSSLGnuTLSFactory : public ModuleFactory
 825 {
 826  public:
 827         ModuleSSLGnuTLSFactory()
 828         {
 829         }
 830
 831         ~ModuleSSLGnuTLSFactory()
 832         {
 833         }
 834
 835         virtual Module * CreateModule(InspIRCd* Me)
 836         {
 837                 return new ModuleSSLGnuTLS(Me);
 838         }
 839 };
 840
 841
 842 extern "C" DllExport void * init_module( void )
 843 {
 844         return new ModuleSSLGnuTLSFactory;
 845 }