src/modules/extra/m_ssl_gnutls.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 #include <gnutls/gnutls.h>
  16 #include <gnutls/x509.h>
  17 #include "transport.h"
  18 #include "m_cap.h"
  19
  20 #ifdef WINDOWS
  21 #pragma comment(lib, "libgnutls-13.lib")
  22 #endif
  23
  24 /* $ModDesc: Provides SSL support for clients */
  25 /* $CompileFlags: pkgconfincludes("gnutls","/gnutls/gnutls.h","") */
  26 /* $LinkerFlags: rpath("pkg-config --libs gnutls") pkgconflibs("gnutls","/libgnutls.so","-lgnutls") */
  27 /* $ModDep: transport.h */
  28 /* $CopyInstall: conf/key.pem $(CONPATH) */
  29 /* $CopyInstall: conf/cert.pem $(CONPATH) */
  30
  31 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  32
  33 /** Represents an SSL user's extra data
  34  */
  35 class issl_session : public classbase
  36 {
  37 public:
  38         issl_session()
  39         {
  40                 sess = NULL;
  41         }
  42
  43         gnutls_session_t sess;
  44         issl_status status;
  45         std::string outbuf;
  46 };
  47
  48 class CommandStartTLS : public Command
  49 {
  50  public:
  51         CommandStartTLS (InspIRCd* Instance, Module* mod) : Command(Instance, mod, "STARTTLS", 0, 0, true)
  52         {
  53         }
  54
  55         CmdResult Handle (const std::vector<std::string> &parameters, User *user)
  56         {
  57                 /* changed from == REG_ALL to catch clients sending STARTTLS
  58                  * after NICK and USER but before OnUserConnect completes and
  59                  * give a proper error message (see bug #645) - dz
  60                  */
  61                 if (user->registered != REG_NONE)
  62                 {
  63                         user->WriteNumeric(691, "%s :STARTTLS is not permitted after client registration has started", user->nick.c_str());
  64                 }
  65                 else
  66                 {
  67                         if (!user->GetIOHook())
  68                         {
  69                                 user->WriteNumeric(670, "%s :STARTTLS successful, go ahead with TLS handshake", user->nick.c_str());
  70                                 user->AddIOHook(creator);
  71                                 creator->OnRawSocketAccept(user->GetFd(), NULL, NULL);
  72                         }
  73                         else
  74                                 user->WriteNumeric(691, "%s :STARTTLS failure", user->nick.c_str());
  75                 }
  76
  77                 return CMD_FAILURE;
  78         }
  79 };
  80
  81 class ModuleSSLGnuTLS : public Module
  82 {
  83         std::set<ListenSocketBase*> listenports;
  84
  85         issl_session* sessions;
  86
  87         gnutls_certificate_credentials x509_cred;
  88         gnutls_dh_params dh_params;
  89
  90         std::string keyfile;
  91         std::string certfile;
  92         std::string cafile;
  93         std::string crlfile;
  94         std::string sslports;
  95         int dh_bits;
  96
  97         bool cred_alloc;
  98
  99         CommandStartTLS starttls;
 100
 101         GenericCap capHandler;
 102  public:
 103
 104         ModuleSSLGnuTLS(InspIRCd* Me)
 105                 : Module(Me), starttls(Me, this), capHandler(this, "tls")
 106         {
 107                 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
 108
 109                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 110
 111                 gnutls_global_init(); // This must be called once in the program
 112
 113                 cred_alloc = false;
 114                 // Needs the flag as it ignores a plain /rehash
 115                 OnModuleRehash(NULL,"ssl");
 116
 117                 // Void return, guess we assume success
 118                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 119                 Implementation eventlist[] = { I_On005Numeric, I_OnRawSocketConnect, I_OnRawSocketAccept,
 120                         I_OnRawSocketClose, I_OnRawSocketRead, I_OnRawSocketWrite, I_OnCleanup,
 121                         I_OnBufferFlushed, I_OnRequest, I_OnRehash, I_OnModuleRehash, I_OnPostConnect,
 122                         I_OnEvent, I_OnHookIO };
 123                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 124
 125                 ServerInstance->AddCommand(&starttls);
 126         }
 127
 128         virtual void OnRehash(User* user)
 129         {
 130                 ConfigReader Conf(ServerInstance);
 131
 132                 listenports.clear();
 133                 sslports.clear();
 134
 135                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 136                 {
 137                         ListenSocketBase* port = ServerInstance->ports[i];
 138                         std::string desc = port->GetDescription();
 139                         if (desc != "gnutls")
 140                                 continue;
 141
 142                         listenports.insert(port);
 143                         std::string portid = port->GetBindDesc();
 144
 145                         ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
 146                         if (port->GetIP() != "127.0.0.1")
 147                                 sslports.append(portid).append(";");
 148                 }
 149
 150                 if (!sslports.empty())
 151                         sslports.erase(sslports.end() - 1);
 152         }
 153
 154         virtual void OnModuleRehash(User* user, const std::string &param)
 155         {
 156                 if(param != "ssl")
 157                         return;
 158
 159                 OnRehash(user);
 160
 161                 ConfigReader Conf(ServerInstance);
 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.empty())
 175                         cafile = "ca.pem";
 176
 177                 if (crlfile.empty())
 178                         crlfile = "crl.pem";
 179
 180                 if (certfile.empty())
 181                         certfile = "cert.pem";
 182
 183                 if (keyfile.empty())
 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] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(cafile)))
 191                         cafile = confdir + cafile;
 192
 193                 if ((crlfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(crlfile)))
 194                         crlfile = confdir + crlfile;
 195
 196                 if ((certfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(certfile)))
 197                         certfile = confdir + certfile;
 198
 199                 if ((keyfile[0] != '/') && (!ServerInstance->Config->StartsWithWindowsDriveLetter(keyfile)))
 200                         keyfile = confdir + keyfile;
 201
 202                 int ret;
 203
 204                 if (cred_alloc)
 205                 {
 206                         // Deallocate the old credentials
 207                         gnutls_dh_params_deinit(dh_params);
 208                         gnutls_certificate_free_credentials(x509_cred);
 209                 }
 210                 else
 211                         cred_alloc = true;
 212
 213                 if((ret = gnutls_certificate_allocate_credentials(&x509_cred)) < 0)
 214                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
 215
 216                 if((ret = gnutls_dh_params_init(&dh_params)) < 0)
 217                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
 218
 219                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 220                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
 221
 222                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 223                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
 224
 225                 if((ret = gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 226                 {
 227                         // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
 228                         throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + ", key: " + keyfile + "): " + std::string(gnutls_strerror(ret)));
 229                 }
 230
 231                 // This may be on a large (once a day or week) timer eventually.
 232                 GenerateDHParams();
 233         }
 234
 235         void GenerateDHParams()
 236         {
 237                 // Generate Diffie Hellman parameters - for use with DHE
 238                 // kx algorithms. These should be discarded and regenerated
 239                 // once a day, once a week or once a month. Depending on the
 240                 // security requirements.
 241
 242                 int ret;
 243
 244                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 245                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 246         }
 247
 248         virtual ~ModuleSSLGnuTLS()
 249         {
 250                 gnutls_dh_params_deinit(dh_params);
 251                 gnutls_certificate_free_credentials(x509_cred);
 252                 gnutls_global_deinit();
 253                 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
 254                 delete[] sessions;
 255         }
 256
 257         virtual void OnCleanup(int target_type, void* item)
 258         {
 259                 if(target_type == TYPE_USER)
 260                 {
 261                         User* user = static_cast<User*>(item);
 262
 263                         if (user->GetIOHook() == this)
 264                         {
 265                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 266                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 267                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 268                                 user->DelIOHook();
 269                         }
 270                 }
 271         }
 272
 273         virtual Version GetVersion()
 274         {
 275                 return Version("$Id$", VF_VENDOR, API_VERSION);
 276         }
 277
 278
 279         virtual void On005Numeric(std::string &output)
 280         {
 281                 if (!sslports.empty())
 282                         output.append(" SSL=" + sslports);
 283                 output.append(" STARTTLS");
 284         }
 285
 286         virtual void OnHookIO(EventHandler* user, ListenSocketBase* lsb)
 287         {
 288                 if (!user->GetIOHook() && listenports.find(lsb) != listenports.end())
 289                 {
 290                         /* Hook the user with our module */
 291                         user->AddIOHook(this);
 292                 }
 293         }
 294
 295         virtual const char* OnRequest(Request* request)
 296         {
 297                 ISHRequest* ISR = static_cast<ISHRequest*>(request);
 298                 if (strcmp("IS_NAME", request->GetId()) == 0)
 299                 {
 300                         return "gnutls";
 301                 }
 302                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 303                 {
 304                         const char* ret = "OK";
 305                         try
 306                         {
 307                                 ret = ISR->Sock->AddIOHook(this) ? "OK" : NULL;
 308                         }
 309                         catch (ModuleException &e)
 310                         {
 311                                 return NULL;
 312                         }
 313                         return ret;
 314                 }
 315                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 316                 {
 317                         return ISR->Sock->DelIOHook() ? "OK" : NULL;
 318                 }
 319                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 320                 {
 321                         if (ISR->Sock->GetFd() < 0)
 322                                 return "OK";
 323
 324                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 325                         return (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) ? NULL : "OK";
 326                 }
 327                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 328                 {
 329                         if (ISR->Sock->GetFd() > -1)
 330                         {
 331                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 332                                 if (session->sess)
 333                                 {
 334                                         if (static_cast<Extensible*>(ServerInstance->SE->GetRef(ISR->Sock->GetFd())) == static_cast<Extensible*>(ISR->Sock))
 335                                         {
 336                                                 return "OK";
 337                                         }
 338                                 }
 339                         }
 340                 }
 341                 else if (strcmp("GET_CERT", request->GetId()) == 0)
 342                 {
 343                         Module* sslinfo = ServerInstance->Modules->Find("m_sslinfo.so");
 344                         if (sslinfo)
 345                                 return sslinfo->OnRequest(request);
 346                 }
 347                 return NULL;
 348         }
 349
 350
 351         virtual void OnRawSocketAccept(int fd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 352         {
 353                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 354                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 355                         return;
 356
 357                 issl_session* session = &sessions[fd];
 358
 359                 /* For STARTTLS: Don't try and init a session on a socket that already has a session */
 360                 if (session->sess)
 361                         return;
 362
 363                 gnutls_init(&session->sess, GNUTLS_SERVER);
 364
 365                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 366                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 367                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 368
 369                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(fd)); // Give gnutls the fd for the socket.
 370
 371                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 372
 373                 Handshake(session, fd);
 374         }
 375
 376         virtual void OnRawSocketConnect(int fd)
 377         {
 378                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 379                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 380                         return;
 381
 382                 issl_session* session = &sessions[fd];
 383
 384                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 385
 386                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 387                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 388                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 389                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(fd)); // Give gnutls the fd for the socket.
 390
 391                 Handshake(session, fd);
 392         }
 393
 394         virtual void OnRawSocketClose(int fd)
 395         {
 396                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 397                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds()))
 398                         return;
 399
 400                 CloseSession(&sessions[fd]);
 401         }
 402
 403         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 404         {
 405                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 406                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 407                         return 0;
 408
 409                 issl_session* session = &sessions[fd];
 410
 411                 if (!session->sess)
 412                 {
 413                         readresult = 0;
 414                         CloseSession(session);
 415                         return 1;
 416                 }
 417
 418                 if (session->status == ISSL_HANDSHAKING_READ)
 419                 {
 420                         // The handshake isn't finished, try to finish it.
 421
 422                         if(!Handshake(session, fd))
 423                         {
 424                                 errno = session->status == ISSL_CLOSING ? EIO : EAGAIN;
 425                                 // Couldn't resume handshake.
 426                                 return -1;
 427                         }
 428                 }
 429                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 430                 {
 431                         errno = EAGAIN;
 432                         MakePollWrite(fd);
 433                         return -1;
 434                 }
 435
 436                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 437
 438                 if (session->status == ISSL_HANDSHAKEN)
 439                 {
 440                         unsigned int len = 0;
 441                         while (len < count)
 442                         {
 443                                 int ret = gnutls_record_recv(session->sess, buffer + len, count - len);
 444                                 if (ret > 0)
 445                                 {
 446                                         len += ret;
 447                                 }
 448                                 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 449                                 {
 450                                         break;
 451                                 }
 452                                 else
 453                                 {
 454                                         if (ret != 0)
 455                                                 ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT,
 456                                                         "m_ssl_gnutls.so: Error while reading on fd %d: %s",
 457                                                         fd, gnutls_strerror(ret));
 458
 459                                         // if ret == 0, client closed connection.
 460                                         readresult = 0;
 461                                         CloseSession(session);
 462                                         return 1;
 463                                 }
 464                         }
 465                         readresult = len;
 466                         if (len)
 467                         {
 468                                 return 1;
 469                         }
 470                         else
 471                         {
 472                                 errno = EAGAIN;
 473                                 return -1;
 474                         }
 475                 }
 476                 else if (session->status == ISSL_CLOSING)
 477                         readresult = 0;
 478
 479                 return 1;
 480         }
 481
 482         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 483         {
 484                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 485                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 486                         return 0;
 487
 488                 issl_session* session = &sessions[fd];
 489                 const char* sendbuffer = buffer;
 490
 491                 if (!session->sess)
 492                 {
 493                         CloseSession(session);
 494                         return 1;
 495                 }
 496
 497                 session->outbuf.append(sendbuffer, count);
 498                 sendbuffer = session->outbuf.c_str();
 499                 count = session->outbuf.size();
 500
 501                 if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ)
 502                 {
 503                         // The handshake isn't finished, try to finish it.
 504                         Handshake(session, fd);
 505                         errno = session->status == ISSL_CLOSING ? EIO : EAGAIN;
 506                         return -1;
 507                 }
 508
 509                 int ret = 0;
 510
 511                 if (session->status == ISSL_HANDSHAKEN)
 512                 {
 513                         ret = gnutls_record_send(session->sess, sendbuffer, count);
 514
 515                         if (ret == 0)
 516                         {
 517                                 CloseSession(session);
 518                         }
 519                         else if (ret < 0)
 520                         {
 521                                 if(ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)
 522                                 {
 523                                         ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT,
 524                                                         "m_ssl_gnutls.so: Error while writing to fd %d: %s",
 525                                                         fd, gnutls_strerror(ret));
 526                                         CloseSession(session);
 527                                 }
 528                                 else
 529                                 {
 530                                         errno = EAGAIN;
 531                                 }
 532                         }
 533                         else
 534                         {
 535                                 session->outbuf = session->outbuf.substr(ret);
 536                         }
 537                 }
 538
 539                 if (!session->outbuf.empty())
 540                         MakePollWrite(fd);
 541
 542                 /* Who's smart idea was it to return 1 when we havent written anything?
 543                  * This fucks the buffer up in BufferedSocket :p
 544                  */
 545                 return ret < 1 ? 0 : ret;
 546         }
 547
 548         bool Handshake(issl_session* session, int fd)
 549         {
 550                 int ret = gnutls_handshake(session->sess);
 551
 552                 if (ret < 0)
 553                 {
 554                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 555                         {
 556                                 // Handshake needs resuming later, read() or write() would have blocked.
 557
 558                                 if(gnutls_record_get_direction(session->sess) == 0)
 559                                 {
 560                                         // gnutls_handshake() wants to read() again.
 561                                         session->status = ISSL_HANDSHAKING_READ;
 562                                 }
 563                                 else
 564                                 {
 565                                         // gnutls_handshake() wants to write() again.
 566                                         session->status = ISSL_HANDSHAKING_WRITE;
 567                                         MakePollWrite(fd);
 568                                 }
 569                         }
 570                         else
 571                         {
 572                                 // Handshake failed.
 573                                 ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT,
 574                                                 "m_ssl_gnutls.so: Handshake failed on fd %d: %s",
 575                                                 fd, gnutls_strerror(ret));
 576                                 CloseSession(session);
 577                                 session->status = ISSL_CLOSING;
 578                         }
 579
 580                         return false;
 581                 }
 582                 else
 583                 {
 584                         // Change the seesion state
 585                         session->status = ISSL_HANDSHAKEN;
 586
 587                         EventHandler* user = ServerInstance->SE->GetRef(fd);
 588
 589                         VerifyCertificate(session,user);
 590
 591                         // Finish writing, if any left
 592                         MakePollWrite(fd);
 593
 594                         return true;
 595                 }
 596         }
 597
 598         virtual void OnPostConnect(User* user)
 599         {
 600                 // This occurs AFTER OnUserConnect so we can be sure the
 601                 // protocol module has propagated the NICK message.
 602                 if (user->GetIOHook() == this && (IS_LOCAL(user)))
 603                 {
 604                         if (sessions[user->GetFd()].sess)
 605                         {
 606                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 607                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 608                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 609                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), cipher.c_str());
 610                         }
 611                 }
 612         }
 613
 614         void MakePollWrite(int fd)
 615         {
 616                 //OnRawSocketWrite(fd, NULL, 0);
 617                 EventHandler* eh = ServerInstance->SE->GetRef(fd);
 618                 if (eh)
 619                         ServerInstance->SE->WantWrite(eh);
 620         }
 621
 622         virtual void OnBufferFlushed(User* user)
 623         {
 624                 if (user->GetIOHook() == this)
 625                 {
 626                         issl_session* session = &sessions[user->GetFd()];
 627                         if (session && session->outbuf.size())
 628                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 629                 }
 630         }
 631
 632         void CloseSession(issl_session* session)
 633         {
 634                 if(session->sess)
 635                 {
 636                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 637                         gnutls_deinit(session->sess);
 638                 }
 639
 640                 session->outbuf.clear();
 641                 session->sess = NULL;
 642                 session->status = ISSL_NONE;
 643         }
 644
 645         void VerifyCertificate(issl_session* session, Extensible* user)
 646         {
 647                 if (!session->sess || !user)
 648                         return;
 649
 650                 Module* sslinfo = ServerInstance->Modules->Find("m_sslinfo.so");
 651                 if (!sslinfo)
 652                         return;
 653
 654                 unsigned int status;
 655                 const gnutls_datum_t* cert_list;
 656                 int ret;
 657                 unsigned int cert_list_size;
 658                 gnutls_x509_crt_t cert;
 659                 char name[MAXBUF];
 660                 unsigned char digest[MAXBUF];
 661                 size_t digest_size = sizeof(digest);
 662                 size_t name_size = sizeof(name);
 663                 ssl_cert* certinfo = new ssl_cert;
 664
 665                 /* This verification function uses the trusted CAs in the credentials
 666                  * structure. So you must have installed one or more CA certificates.
 667                  */
 668                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 669
 670                 if (ret < 0)
 671                 {
 672                         certinfo->error = std::string(gnutls_strerror(ret));
 673                         goto info_done;
 674                 }
 675
 676                 certinfo->invalid = (status & GNUTLS_CERT_INVALID);
 677                 certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND);
 678                 certinfo->revoked = (status & GNUTLS_CERT_REVOKED);
 679                 certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA);
 680
 681                 /* Up to here the process is the same for X.509 certificates and
 682                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 683                  * be easily extended to work with openpgp keys as well.
 684                  */
 685                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 686                 {
 687                         certinfo->error = "No X509 keys sent";
 688                         goto info_done;
 689                 }
 690
 691                 ret = gnutls_x509_crt_init(&cert);
 692                 if (ret < 0)
 693                 {
 694                         certinfo->error = gnutls_strerror(ret);
 695                         goto info_done;
 696                 }
 697
 698                 cert_list_size = 0;
 699                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 700                 if (cert_list == NULL)
 701                 {
 702                         certinfo->error = "No certificate was found";
 703                         goto info_done_dealloc;
 704                 }
 705
 706                 /* This is not a real world example, since we only check the first
 707                  * certificate in the given chain.
 708                  */
 709
 710                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 711                 if (ret < 0)
 712                 {
 713                         certinfo->error = gnutls_strerror(ret);
 714                         goto info_done_dealloc;
 715                 }
 716
 717                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 718                 certinfo->dn = name;
 719
 720                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 721                 certinfo->issuer = name;
 722
 723                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 724                 {
 725                         certinfo->error = gnutls_strerror(ret);
 726                 }
 727                 else
 728                 {
 729                         certinfo->fingerprint = irc::hex(digest, digest_size);
 730                 }
 731
 732                 /* Beware here we do not check for errors.
 733                  */
 734                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 735                 {
 736                         certinfo->error = "Not activated, or expired certificate";
 737                 }
 738
 739 info_done_dealloc:
 740                 gnutls_x509_crt_deinit(cert);
 741 info_done:
 742                 BufferedSocketFingerprintSubmission(user, this, sslinfo, certinfo).Send();
 743         }
 744
 745         void OnEvent(Event* ev)
 746         {
 747                 capHandler.HandleEvent(ev);
 748         }
 749 };
 750
 751 MODULE_INIT(ModuleSSLGnuTLS)