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 <string>
  15 #include <vector>
  16
  17 #include <gnutls/gnutls.h>
  18 #include <gnutls/x509.h>
  19
  20 #include "inspircd_config.h"
  21 #include "configreader.h"
  22 #include "users.h"
  23 #include "channels.h"
  24 #include "modules.h"
  25
  26 #include "socket.h"
  27 #include "hashcomp.h"
  28 #include "inspircd.h"
  29
  30 #include "transport.h"
  31
  32 /* $ModDesc: Provides SSL support for clients */
  33 /* $CompileFlags: exec("libgnutls-config --cflags") */
  34 /* $LinkerFlags: rpath("libgnutls-config --libs") exec("libgnutls-config --libs") */
  35 /* $ModDep: transport.h */
  36
  37
  38 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  39
  40 bool isin(int port, const std::vector<int> &portlist)
  41 {
  42         for(unsigned int i = 0; i < portlist.size(); i++)
  43                 if(portlist[i] == port)
  44                         return true;
  45
  46         return false;
  47 }
  48
  49 /** Represents an SSL user's extra data
  50  */
  51 class issl_session : public classbase
  52 {
  53 public:
  54         gnutls_session_t sess;
  55         issl_status status;
  56         std::string outbuf;
  57         int inbufoffset;
  58         char* inbuf;
  59         int fd;
  60 };
  61
  62 class ModuleSSLGnuTLS : public Module
  63 {
  64
  65         ConfigReader* Conf;
  66
  67         char* dummy;
  68
  69         std::vector<int> listenports;
  70
  71         int inbufsize;
  72         issl_session sessions[MAX_DESCRIPTORS];
  73
  74         gnutls_certificate_credentials x509_cred;
  75         gnutls_dh_params dh_params;
  76
  77         std::string keyfile;
  78         std::string certfile;
  79         std::string cafile;
  80         std::string crlfile;
  81         int dh_bits;
  82
  83         int clientactive;
  84
  85  public:
  86
  87         ModuleSSLGnuTLS(InspIRCd* Me)
  88                 : Module::Module(Me)
  89         {
  90                 ServerInstance->PublishInterface("InspSocketHook", this);
  91
  92                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
  93                 inbufsize = ServerInstance->Config->NetBufferSize;
  94
  95                 gnutls_global_init(); // This must be called once in the program
  96
  97                 if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
  98                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
  99
 100                 // Guessing return meaning
 101                 if(gnutls_dh_params_init(&dh_params) < 0)
 102                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters");
 103
 104                 // Needs the flag as it ignores a plain /rehash
 105                 OnRehash(NULL,"ssl");
 106
 107                 // Void return, guess we assume success
 108                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 109         }
 110
 111         virtual void OnRehash(userrec* user, const std::string &param)
 112         {
 113                 if(param != "ssl")
 114                         return;
 115
 116                 Conf = new ConfigReader(ServerInstance);
 117
 118                 for(unsigned int i = 0; i < listenports.size(); i++)
 119                 {
 120                         ServerInstance->Config->DelIOHook(listenports[i]);
 121                 }
 122
 123                 listenports.clear();
 124                 clientactive = 0;
 125
 126                 for(int i = 0; i < Conf->Enumerate("bind"); i++)
 127                 {
 128                         // For each <bind> tag
 129                         if(((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "gnutls"))
 130                         {
 131                                 // Get the port we're meant to be listening on with SSL
 132                                 std::string port = Conf->ReadValue("bind", "port", i);
 133                                 irc::portparser portrange(port, false);
 134                                 long portno = -1;
 135                                 while ((portno = portrange.GetToken()))
 136                                 {
 137                                         clientactive++;
 138                                         try
 139                                         {
 140                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 141                                                 {
 142                                                         listenports.push_back(portno);
 143                                                         for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 144                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 145                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 146                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portno);
 147                                                 }
 148                                                 else
 149                                                 {
 150                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 151                                                 }
 152                                         }
 153                                         catch (ModuleException &e)
 154                                         {
 155                                                 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());
 156                                         }
 157                                 }
 158                         }
 159                 }
 160
 161                 std::string confdir(ServerInstance->ConfigFileName);
 162                 // +1 so we the path ends with a /
 163                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 164
 165                 cafile  = Conf->ReadValue("gnutls", "cafile", 0);
 166                 crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
 167                 certfile        = Conf->ReadValue("gnutls", "certfile", 0);
 168                 keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
 169                 dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
 170
 171                 // Set all the default values needed.
 172                 if(cafile == "")
 173                         cafile = "ca.pem";
 174
 175                 if(crlfile == "")
 176                         crlfile = "crl.pem";
 177
 178                 if(certfile == "")
 179                         certfile = "cert.pem";
 180
 181                 if(keyfile == "")
 182                         keyfile = "key.pem";
 183
 184                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 185                         dh_bits = 1024;
 186
 187                 // Prepend relative paths with the path to the config directory.
 188                 if(cafile[0] != '/')
 189                         cafile = confdir + cafile;
 190
 191                 if(crlfile[0] != '/')
 192                         crlfile = confdir + crlfile;
 193
 194                 if(certfile[0] != '/')
 195                         certfile = confdir + certfile;
 196
 197                 if(keyfile[0] != '/')
 198                         keyfile = confdir + keyfile;
 199
 200                 int ret;
 201
 202                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 203                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
 204
 205                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 206                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
 207
 208                 // Guessing on the return value of this, manual doesn't say :|
 209                 if((ret = gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 210                         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));
 211
 212                 // This may be on a large (once a day or week) timer eventually.
 213                 GenerateDHParams();
 214
 215                 DELETE(Conf);
 216         }
 217
 218         void GenerateDHParams()
 219         {
 220                 // Generate Diffie Hellman parameters - for use with DHE
 221                 // kx algorithms. These should be discarded and regenerated
 222                 // once a day, once a week or once a month. Depending on the
 223                 // security requirements.
 224
 225                 int ret;
 226
 227                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 228                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 229         }
 230
 231         virtual ~ModuleSSLGnuTLS()
 232         {
 233                 gnutls_dh_params_deinit(dh_params);
 234                 gnutls_certificate_free_credentials(x509_cred);
 235                 gnutls_global_deinit();
 236         }
 237
 238         virtual void OnCleanup(int target_type, void* item)
 239         {
 240                 if(target_type == TYPE_USER)
 241                 {
 242                         userrec* user = (userrec*)item;
 243
 244                         if(user->GetExt("ssl", dummy) && isin(user->GetPort(), listenports))
 245                         {
 246                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 247                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 248                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 249                         }
 250                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 251                         {
 252                                 ssl_cert* tofree;
 253                                 user->GetExt("ssl_cert", tofree);
 254                                 delete tofree;
 255                                 user->Shrink("ssl_cert");
 256                         }
 257                 }
 258         }
 259
 260         virtual void OnUnloadModule(Module* mod, const std::string &name)
 261         {
 262                 if(mod == this)
 263                 {
 264                         for(unsigned int i = 0; i < listenports.size(); i++)
 265                         {
 266                                 ServerInstance->Config->DelIOHook(listenports[i]);
 267                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 268                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 269                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 270                         }
 271                 }
 272         }
 273
 274         virtual Version GetVersion()
 275         {
 276                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 277         }
 278
 279         void Implements(char* List)
 280         {
 281                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 282                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 283         }
 284
 285         virtual char* OnRequest(Request* request)
 286         {
 287                 ISHRequest* ISR = (ISHRequest*)request;
 288                 if (strcmp("IS_NAME", request->GetId()) == 0)
 289                 {
 290                         return "gnutls";
 291                 }
 292                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 293                 {
 294                         char* ret = "OK";
 295                         try
 296                         {
 297                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 298                         }
 299                         catch (ModuleException &e)
 300                         {
 301                                 return NULL;
 302                         }
 303                         return ret;
 304                 }
 305                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 306                 {
 307                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 308                 }
 309                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 310                 {
 311                         if (ISR->Sock->GetFd() < 0)
 312                                 return (char*)"OK";
 313
 314                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 315                         return (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) ? NULL : (char*)"OK";
 316                 }
 317                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 318                 {
 319                         if (ISR->Sock->GetFd() > -1)
 320                         {
 321                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 322                                 if (session->sess)
 323                                 {
 324                                         if ((Extensible*)ServerInstance->FindDescriptor(ISR->Sock->GetFd()) == (Extensible*)(ISR->Sock))
 325                                         {
 326                                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 327                                                 return "OK";
 328                                         }
 329                                 }
 330                         }
 331                 }
 332                 return NULL;
 333         }
 334
 335
 336         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 337         {
 338                 issl_session* session = &sessions[fd];
 339
 340                 session->fd = fd;
 341                 session->inbuf = new char[inbufsize];
 342                 session->inbufoffset = 0;
 343
 344                 gnutls_init(&session->sess, GNUTLS_SERVER);
 345
 346                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 347                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 348                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 349
 350                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 351                  * This needs testing, but it's easy enough to rollback if need be
 352                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 353                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 354                  *
 355                  * With testing this seems to...not work :/
 356                  */
 357
 358                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 359
 360                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 361
 362                 Handshake(session);
 363         }
 364
 365         virtual void OnRawSocketConnect(int fd)
 366         {
 367                 issl_session* session = &sessions[fd];
 368
 369                 session->fd = fd;
 370                 session->inbuf = new char[inbufsize];
 371                 session->inbufoffset = 0;
 372
 373                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 374
 375                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 376                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 377                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 378                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 379
 380                 Handshake(session);
 381         }
 382
 383         virtual void OnRawSocketClose(int fd)
 384         {
 385                 CloseSession(&sessions[fd]);
 386
 387                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 388
 389                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 390                 {
 391                         ssl_cert* tofree;
 392                         user->GetExt("ssl_cert", tofree);
 393                         delete tofree;
 394                         user->Shrink("ssl_cert");
 395                 }
 396         }
 397
 398         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 399         {
 400                 issl_session* session = &sessions[fd];
 401
 402                 if (!session->sess)
 403                 {
 404                         readresult = 0;
 405                         CloseSession(session);
 406                         return 1;
 407                 }
 408
 409                 if (session->status == ISSL_HANDSHAKING_READ)
 410                 {
 411                         // The handshake isn't finished, try to finish it.
 412
 413                         if(!Handshake(session))
 414                         {
 415                                 // Couldn't resume handshake.
 416                                 return -1;
 417                         }
 418                 }
 419                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 420                 {
 421                         errno = EAGAIN;
 422                         return -1;
 423                 }
 424
 425                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 426
 427                 if (session->status == ISSL_HANDSHAKEN)
 428                 {
 429                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 430                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 431                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 432
 433                         if (ret == 0)
 434                         {
 435                                 // Client closed connection.
 436                                 readresult = 0;
 437                                 CloseSession(session);
 438                                 return 1;
 439                         }
 440                         else if (ret < 0)
 441                         {
 442                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 443                                 {
 444                                         errno = EAGAIN;
 445                                         return -1;
 446                                 }
 447                                 else
 448                                 {
 449                                         readresult = 0;
 450                                         CloseSession(session);
 451                                 }
 452                         }
 453                         else
 454                         {
 455                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 456                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 457                                 // 'buffer' is 'count' long
 458
 459                                 unsigned int length = ret + session->inbufoffset;
 460
 461                                 if(count <= length)
 462                                 {
 463                                         memcpy(buffer, session->inbuf, count);
 464                                         // Move the stuff left in inbuf to the beginning of it
 465                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 466                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 467                                         session->inbufoffset = length - count;
 468                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 469                                         readresult = count;
 470                                 }
 471                                 else
 472                                 {
 473                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 474                                         memcpy(buffer, session->inbuf, length);
 475                                         // Zero the offset, as there's nothing there..
 476                                         session->inbufoffset = 0;
 477                                         // As above
 478                                         readresult = length;
 479                                 }
 480                         }
 481                 }
 482                 else if(session->status == ISSL_CLOSING)
 483                         readresult = 0;
 484
 485                 return 1;
 486         }
 487
 488         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 489         {
 490                 if (!count)
 491                         return 0;
 492
 493                 issl_session* session = &sessions[fd];
 494                 const char* sendbuffer = buffer;
 495
 496                 if (!session->sess)
 497                 {
 498                         CloseSession(session);
 499                         return 1;
 500                 }
 501
 502                 session->outbuf.append(sendbuffer, count);
 503                 sendbuffer = session->outbuf.c_str();
 504                 count = session->outbuf.size();
 505
 506                 if(session->status == ISSL_HANDSHAKING_WRITE)
 507                 {
 508                         // The handshake isn't finished, try to finish it.
 509                         Handshake(session);
 510                         errno = EAGAIN;
 511                         return -1;
 512                 }
 513
 514                 int ret = 0;
 515
 516                 if(session->status == ISSL_HANDSHAKEN)
 517                 {
 518                         ret = gnutls_record_send(session->sess, sendbuffer, count);
 519
 520                         if(ret == 0)
 521                         {
 522                                 CloseSession(session);
 523                         }
 524                         else if (ret < 0)
 525                         {
 526                                 if(ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)
 527                                 {
 528                                         CloseSession(session);
 529                                 }
 530                                 else
 531                                 {
 532                                         errno = EAGAIN;
 533                                         return -1;
 534                                 }
 535                         }
 536                         else
 537                         {
 538                                 session->outbuf = session->outbuf.substr(ret);
 539                         }
 540                 }
 541
 542                 /* Who's smart idea was it to return 1 when we havent written anything?
 543                  * This fucks the buffer up in InspSocket :p
 544                  */
 545                 return ret < 1 ? 0 : ret;
 546         }
 547
 548         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 549         virtual void OnWhois(userrec* source, userrec* dest)
 550         {
 551                 if (!clientactive)
 552                         return;
 553
 554                 // Bugfix, only send this numeric for *our* SSL users
 555                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 556                 {
 557                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 558                 }
 559         }
 560
 561         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 562         {
 563                 // check if the linking module wants to know about OUR metadata
 564                 if(extname == "ssl")
 565                 {
 566                         // check if this user has an swhois field to send
 567                         if(user->GetExt(extname, dummy))
 568                         {
 569                                 // call this function in the linking module, let it format the data how it
 570                                 // sees fit, and send it on its way. We dont need or want to know how.
 571                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 572                         }
 573                 }
 574         }
 575
 576         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 577         {
 578                 // check if its our metadata key, and its associated with a user
 579                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 580                 {
 581                         userrec* dest = (userrec*)target;
 582                         // if they dont already have an ssl flag, accept the remote server's
 583                         if (!dest->GetExt(extname, dummy))
 584                         {
 585                                 dest->Extend(extname, "ON");
 586                         }
 587                 }
 588         }
 589
 590         bool Handshake(issl_session* session)
 591         {
 592                 int ret = gnutls_handshake(session->sess);
 593
 594                 if (ret < 0)
 595                 {
 596                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 597                         {
 598                                 // Handshake needs resuming later, read() or write() would have blocked.
 599
 600                                 if(gnutls_record_get_direction(session->sess) == 0)
 601                                 {
 602                                         // gnutls_handshake() wants to read() again.
 603                                         session->status = ISSL_HANDSHAKING_READ;
 604                                 }
 605                                 else
 606                                 {
 607                                         // gnutls_handshake() wants to write() again.
 608                                         session->status = ISSL_HANDSHAKING_WRITE;
 609                                         MakePollWrite(session);
 610                                 }
 611                         }
 612                         else
 613                         {
 614                                 // Handshake failed.
 615                                 CloseSession(session);
 616                                 session->status = ISSL_CLOSING;
 617                         }
 618
 619                         return false;
 620                 }
 621                 else
 622                 {
 623                         // Handshake complete.
 624                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 625                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 626                         if (extendme)
 627                         {
 628                                 if (!extendme->GetExt("ssl", dummy))
 629                                         extendme->Extend("ssl", "ON");
 630                         }
 631
 632                         // Change the seesion state
 633                         session->status = ISSL_HANDSHAKEN;
 634
 635                         // Finish writing, if any left
 636                         MakePollWrite(session);
 637
 638                         return true;
 639                 }
 640         }
 641
 642         virtual void OnPostConnect(userrec* user)
 643         {
 644                 // This occurs AFTER OnUserConnect so we can be sure the
 645                 // protocol module has propogated the NICK message.
 646                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 647                 {
 648                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 649                         std::deque<std::string>* metadata = new std::deque<std::string>;
 650                         metadata->push_back(user->nick);
 651                         metadata->push_back("ssl");             // The metadata id
 652                         metadata->push_back("ON");              // The value to send
 653                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 654                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 655                         DELETE(event);
 656                         DELETE(metadata);
 657
 658                         VerifyCertificate(&sessions[user->GetFd()],user);
 659                         if (sessions[user->GetFd()].sess)
 660                         {
 661                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 662                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 663                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 664                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, cipher.c_str());
 665                         }
 666                 }
 667         }
 668
 669         void MakePollWrite(issl_session* session)
 670         {
 671                 OnRawSocketWrite(session->fd, NULL, 0);
 672         }
 673
 674         void CloseSession(issl_session* session)
 675         {
 676                 if(session->sess)
 677                 {
 678                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 679                         gnutls_deinit(session->sess);
 680                 }
 681
 682                 if(session->inbuf)
 683                 {
 684                         delete[] session->inbuf;
 685                 }
 686
 687                 session->outbuf.clear();
 688                 session->inbuf = NULL;
 689                 session->sess = NULL;
 690                 session->status = ISSL_NONE;
 691         }
 692
 693         void VerifyCertificate(issl_session* session, Extensible* user)
 694         {
 695                 if (!session->sess || !user)
 696                         return;
 697
 698                 unsigned int status;
 699                 const gnutls_datum_t* cert_list;
 700                 int ret;
 701                 unsigned int cert_list_size;
 702                 gnutls_x509_crt_t cert;
 703                 char name[MAXBUF];
 704                 unsigned char digest[MAXBUF];
 705                 size_t digest_size = sizeof(digest);
 706                 size_t name_size = sizeof(name);
 707                 ssl_cert* certinfo = new ssl_cert;
 708
 709                 user->Extend("ssl_cert",certinfo);
 710
 711                 /* This verification function uses the trusted CAs in the credentials
 712                  * structure. So you must have installed one or more CA certificates.
 713                  */
 714                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 715
 716                 if (ret < 0)
 717                 {
 718                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 719                         return;
 720                 }
 721
 722                 if (status & GNUTLS_CERT_INVALID)
 723                 {
 724                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 725                 }
 726                 else
 727                 {
 728                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 729                 }
 730                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 731                 {
 732                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 733                 }
 734                 else
 735                 {
 736                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 737                 }
 738                 if (status & GNUTLS_CERT_REVOKED)
 739                 {
 740                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 741                 }
 742                 else
 743                 {
 744                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 745                 }
 746                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 747                 {
 748                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 749                 }
 750                 else
 751                 {
 752                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 753                 }
 754
 755                 /* Up to here the process is the same for X.509 certificates and
 756                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 757                  * be easily extended to work with openpgp keys as well.
 758                  */
 759                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 760                 {
 761                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 762                         return;
 763                 }
 764
 765                 ret = gnutls_x509_crt_init(&cert);
 766                 if (ret < 0)
 767                 {
 768                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 769                         return;
 770                 }
 771
 772                 cert_list_size = 0;
 773                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 774                 if (cert_list == NULL)
 775                 {
 776                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 777                         return;
 778                 }
 779
 780                 /* This is not a real world example, since we only check the first
 781                  * certificate in the given chain.
 782                  */
 783
 784                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 785                 if (ret < 0)
 786                 {
 787                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 788                         return;
 789                 }
 790
 791                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 792
 793                 certinfo->data.insert(std::make_pair("dn",name));
 794
 795                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 796
 797                 certinfo->data.insert(std::make_pair("issuer",name));
 798
 799                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 800                 {
 801                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 802                 }
 803                 else
 804                 {
 805                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 806                 }
 807
 808                 /* Beware here we do not check for errors.
 809                  */
 810                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 811                 {
 812                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 813                 }
 814
 815                 gnutls_x509_crt_deinit(cert);
 816
 817                 return;
 818         }
 819
 820 };
 821
 822 class ModuleSSLGnuTLSFactory : public ModuleFactory
 823 {
 824  public:
 825         ModuleSSLGnuTLSFactory()
 826         {
 827         }
 828
 829         ~ModuleSSLGnuTLSFactory()
 830         {
 831         }
 832
 833         virtual Module * CreateModule(InspIRCd* Me)
 834         {
 835                 return new ModuleSSLGnuTLS(Me);
 836         }
 837 };
 838
 839
 840 extern "C" void * init_module( void )
 841 {
 842         return new ModuleSSLGnuTLSFactory;
 843 }