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 (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                                         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(CONFIG_FILE);
 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 (unsigned int j = 0; j < ServerInstance->stats->BoundPortCount; j++)
 268                                         if (ServerInstance->Config->ports[j] == listenports[i])
 269                                                 if (ServerInstance->Config->openSockfd[j])
 270                                                         ServerInstance->Config->openSockfd[j]->SetDescription("plaintext");
 271                         }
 272                 }
 273         }
 274
 275         virtual Version GetVersion()
 276         {
 277                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 278         }
 279
 280         void Implements(char* List)
 281         {
 282                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 283                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 284         }
 285
 286         virtual char* OnRequest(Request* request)
 287         {
 288                 ISHRequest* ISR = (ISHRequest*)request;
 289                 if (strcmp("IS_NAME", request->GetId()) == 0)
 290                 {
 291                         return "gnutls";
 292                 }
 293                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 294                 {
 295                         char* ret = "OK";
 296                         try
 297                         {
 298                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 299                         }
 300                         catch (ModuleException &e)
 301                         {
 302                                 return NULL;
 303                         }
 304                         return ret;
 305                 }
 306                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 307                 {
 308                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 309                 }
 310                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 311                 {
 312                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 313                         return (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) ? NULL : (char*)"OK";
 314                 }
 315                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 316                 {
 317                         if (ISR->Sock->GetFd() > -1)
 318                         {
 319                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 320                                 if (session)
 321                                 {
 322                                         if ((Extensible*)ServerInstance->FindDescriptor(ISR->Sock->GetFd()) == (Extensible*)(ISR->Sock))
 323                                         {
 324                                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 325                                                 return "OK";
 326                                         }
 327                                 }
 328                         }
 329                 }
 330                 return NULL;
 331         }
 332
 333
 334         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 335         {
 336                 issl_session* session = &sessions[fd];
 337
 338                 session->fd = fd;
 339                 session->inbuf = new char[inbufsize];
 340                 session->inbufoffset = 0;
 341
 342                 gnutls_init(&session->sess, GNUTLS_SERVER);
 343
 344                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 345                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 346                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 347                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 348
 349                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 350                  * This needs testing, but it's easy enough to rollback if need be
 351                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 352                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 353                  *
 354                  * With testing this seems to...not work :/
 355                  */
 356
 357                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 358
 359                 Handshake(session);
 360         }
 361
 362         virtual void OnRawSocketConnect(int fd)
 363         {
 364                 issl_session* session = &sessions[fd];
 365
 366                 session->fd = fd;
 367                 session->inbuf = new char[inbufsize];
 368                 session->inbufoffset = 0;
 369
 370                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 371
 372                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 373                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 374                 //TODO: Request server cert here.
 375                 //gnutls_certificate_request(session->sess, GNUTLS_CERT_REQUEST); // Request server certificate if any.
 376                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 377
 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                         return -1;
 422                 }
 423
 424                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 425
 426                 if (session->status == ISSL_HANDSHAKEN)
 427                 {
 428                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 429                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 430                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 431
 432                         if (ret == 0)
 433                         {
 434                                 // Client closed connection.
 435                                 readresult = 0;
 436                                 CloseSession(session);
 437                                 return 1;
 438                         }
 439                         else if (ret < 0)
 440                         {
 441                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 442                                         return -1;
 443                                 else
 444                                 {
 445                                         readresult = 0;
 446                                         CloseSession(session);
 447                                 }
 448                         }
 449                         else
 450                         {
 451                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 452                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 453                                 // 'buffer' is 'count' long
 454
 455                                 unsigned int length = ret + session->inbufoffset;
 456
 457                                 if(count <= length)
 458                                 {
 459                                         memcpy(buffer, session->inbuf, count);
 460                                         // Move the stuff left in inbuf to the beginning of it
 461                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 462                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 463                                         session->inbufoffset = length - count;
 464                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 465                                         readresult = count;
 466                                 }
 467                                 else
 468                                 {
 469                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 470                                         memcpy(buffer, session->inbuf, length);
 471                                         // Zero the offset, as there's nothing there..
 472                                         session->inbufoffset = 0;
 473                                         // As above
 474                                         readresult = length;
 475                                 }
 476                         }
 477                 }
 478                 else if(session->status == ISSL_CLOSING)
 479                         readresult = 0;
 480
 481                 return 1;
 482         }
 483
 484         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 485         {
 486                 if (!count)
 487                         return 0;
 488
 489                 issl_session* session = &sessions[fd];
 490                 const char* sendbuffer = buffer;
 491
 492                 if (!session->sess)
 493                 {
 494                         CloseSession(session);
 495                         return 1;
 496                 }
 497
 498                 session->outbuf.append(sendbuffer, count);
 499                 sendbuffer = session->outbuf.c_str();
 500                 count = session->outbuf.size();
 501
 502                 if(session->status == ISSL_HANDSHAKING_WRITE)
 503                 {
 504                         // The handshake isn't finished, try to finish it.
 505                         Handshake(session);
 506                         errno = EAGAIN;
 507                         return 0;
 508                 }
 509
 510                 int ret = 0;
 511
 512                 if(session->status == ISSL_HANDSHAKEN)
 513                 {
 514                         ret = gnutls_record_send(session->sess, sendbuffer, count);
 515
 516                         if(ret == 0)
 517                                 CloseSession(session);
 518                         else if(ret < 0)
 519                         {
 520                                 if(ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)
 521                                         CloseSession(session);
 522                         }
 523                         else
 524                         {
 525                                 session->outbuf = session->outbuf.substr(ret);
 526                         }
 527                 }
 528
 529                 /* Who's smart idea was it to return 1 when we havent written anything?
 530                  * This fucks the buffer up in InspSocket :p
 531                  */
 532                 return ret < 1 ? 0 : ret;
 533         }
 534
 535         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 536         virtual void OnWhois(userrec* source, userrec* dest)
 537         {
 538                 if (!clientactive)
 539                         return;
 540
 541                 // Bugfix, only send this numeric for *our* SSL users
 542                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 543                 {
 544                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 545                 }
 546         }
 547
 548         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 549         {
 550                 // check if the linking module wants to know about OUR metadata
 551                 if(extname == "ssl")
 552                 {
 553                         // check if this user has an swhois field to send
 554                         if(user->GetExt(extname, dummy))
 555                         {
 556                                 // call this function in the linking module, let it format the data how it
 557                                 // sees fit, and send it on its way. We dont need or want to know how.
 558                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 559                         }
 560                 }
 561         }
 562
 563         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 564         {
 565                 // check if its our metadata key, and its associated with a user
 566                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 567                 {
 568                         userrec* dest = (userrec*)target;
 569                         // if they dont already have an ssl flag, accept the remote server's
 570                         if (!dest->GetExt(extname, dummy))
 571                         {
 572                                 dest->Extend(extname, "ON");
 573                         }
 574                 }
 575         }
 576
 577         bool Handshake(issl_session* session)
 578         {
 579                 int ret = gnutls_handshake(session->sess);
 580
 581                 if (ret < 0)
 582                 {
 583                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 584                         {
 585                                 // Handshake needs resuming later, read() or write() would have blocked.
 586
 587                                 if(gnutls_record_get_direction(session->sess) == 0)
 588                                 {
 589                                         // gnutls_handshake() wants to read() again.
 590                                         session->status = ISSL_HANDSHAKING_READ;
 591                                 }
 592                                 else
 593                                 {
 594                                         // gnutls_handshake() wants to write() again.
 595                                         session->status = ISSL_HANDSHAKING_WRITE;
 596                                         MakePollWrite(session);
 597                                 }
 598                         }
 599                         else
 600                         {
 601                                 // Handshake failed.
 602                                 CloseSession(session);
 603                                 session->status = ISSL_CLOSING;
 604                         }
 605
 606                         return false;
 607                 }
 608                 else
 609                 {
 610                         // Handshake complete.
 611                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 612                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 613                         if (extendme)
 614                         {
 615                                 if (!extendme->GetExt("ssl", dummy))
 616                                         extendme->Extend("ssl", "ON");
 617                         }
 618
 619                         // Change the seesion state
 620                         session->status = ISSL_HANDSHAKEN;
 621
 622                         // Finish writing, if any left
 623                         MakePollWrite(session);
 624
 625                         return true;
 626                 }
 627         }
 628
 629         virtual void OnPostConnect(userrec* user)
 630         {
 631                 // This occurs AFTER OnUserConnect so we can be sure the
 632                 // protocol module has propogated the NICK message.
 633                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 634                 {
 635                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 636                         std::deque<std::string>* metadata = new std::deque<std::string>;
 637                         metadata->push_back(user->nick);
 638                         metadata->push_back("ssl");             // The metadata id
 639                         metadata->push_back("ON");              // The value to send
 640                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 641                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 642                         DELETE(event);
 643                         DELETE(metadata);
 644
 645                         VerifyCertificate(&sessions[user->GetFd()],user);
 646                 }
 647         }
 648
 649         void MakePollWrite(issl_session* session)
 650         {
 651                 OnRawSocketWrite(session->fd, NULL, 0);
 652         }
 653
 654         void CloseSession(issl_session* session)
 655         {
 656                 if(session->sess)
 657                 {
 658                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 659                         gnutls_deinit(session->sess);
 660                 }
 661
 662                 if(session->inbuf)
 663                 {
 664                         delete[] session->inbuf;
 665                 }
 666
 667                 session->outbuf.clear();
 668                 session->inbuf = NULL;
 669                 session->sess = NULL;
 670                 session->status = ISSL_NONE;
 671         }
 672
 673         void VerifyCertificate(issl_session* session, Extensible* user)
 674         {
 675                 unsigned int status;
 676                 const gnutls_datum_t* cert_list;
 677                 int ret;
 678                 unsigned int cert_list_size;
 679                 gnutls_x509_crt_t cert;
 680                 char name[MAXBUF];
 681                 unsigned char digest[MAXBUF];
 682                 size_t digest_size = sizeof(digest);
 683                 size_t name_size = sizeof(name);
 684                 ssl_cert* certinfo = new ssl_cert;
 685
 686                 user->Extend("ssl_cert",certinfo);
 687
 688                 /* This verification function uses the trusted CAs in the credentials
 689                  * structure. So you must have installed one or more CA certificates.
 690                  */
 691                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 692
 693                 if (ret < 0)
 694                 {
 695                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 696                         return;
 697                 }
 698
 699                 if (status & GNUTLS_CERT_INVALID)
 700                 {
 701                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 702                 }
 703                 else
 704                 {
 705                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 706                 }
 707                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 708                 {
 709                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 710                 }
 711                 else
 712                 {
 713                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 714                 }
 715                 if (status & GNUTLS_CERT_REVOKED)
 716                 {
 717                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 718                 }
 719                 else
 720                 {
 721                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 722                 }
 723                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 724                 {
 725                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 726                 }
 727                 else
 728                 {
 729                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 730                 }
 731
 732                 /* Up to here the process is the same for X.509 certificates and
 733                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 734                  * be easily extended to work with openpgp keys as well.
 735                  */
 736                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 737                 {
 738                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 739                         return;
 740                 }
 741
 742                 ret = gnutls_x509_crt_init(&cert);
 743                 if (ret < 0)
 744                 {
 745                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 746                         return;
 747                 }
 748
 749                 cert_list_size = 0;
 750                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 751                 if (cert_list == NULL)
 752                 {
 753                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 754                         return;
 755                 }
 756
 757                 /* This is not a real world example, since we only check the first
 758                  * certificate in the given chain.
 759                  */
 760
 761                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 762                 if (ret < 0)
 763                 {
 764                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 765                         return;
 766                 }
 767
 768                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 769
 770                 certinfo->data.insert(std::make_pair("dn",name));
 771
 772                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 773
 774                 certinfo->data.insert(std::make_pair("issuer",name));
 775
 776                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 777                 {
 778                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 779                 }
 780                 else
 781                 {
 782                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 783                 }
 784
 785                 /* Beware here we do not check for errors.
 786                  */
 787                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 788                 {
 789                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 790                 }
 791
 792                 gnutls_x509_crt_deinit(cert);
 793
 794                 return;
 795         }
 796
 797 };
 798
 799 class ModuleSSLGnuTLSFactory : public ModuleFactory
 800 {
 801  public:
 802         ModuleSSLGnuTLSFactory()
 803         {
 804         }
 805
 806         ~ModuleSSLGnuTLSFactory()
 807         {
 808         }
 809
 810         virtual Module * CreateModule(InspIRCd* Me)
 811         {
 812                 return new ModuleSSLGnuTLS(Me);
 813         }
 814 };
 815
 816
 817 extern "C" void * init_module( void )
 818 {
 819         return new ModuleSSLGnuTLSFactory;
 820 }