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