src/modules/extra/m_ssl_gnutls.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #include <gnutls/gnutls.h>
  17 #include <gnutls/x509.h>
  18
  19 #include "inspircd_config.h"
  20 #include "configreader.h"
  21 #include "users.h"
  22 #include "channels.h"
  23 #include "modules.h"
  24 #include "socket.h"
  25 #include "hashcomp.h"
  26 #include "transport.h"
  27
  28 #ifdef WINDOWS
  29 #pragma comment(lib, "libgnutls-13.lib")
  30 #undef MAX_DESCRIPTORS
  31 #define MAX_DESCRIPTORS 10000
  32 #endif
  33
  34 /* $ModDesc: Provides SSL support for clients */
  35 /* $CompileFlags: exec("libgnutls-config --cflags") */
  36 /* $LinkerFlags: rpath("libgnutls-config --libs") exec("libgnutls-config --libs") */
  37 /* $ModDep: transport.h */
  38
  39
  40 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  41
  42 bool isin(int port, const std::vector<int> &portlist)
  43 {
  44         for(unsigned int i = 0; i < portlist.size(); i++)
  45                 if(portlist[i] == port)
  46                         return true;
  47
  48         return false;
  49 }
  50
  51 /** Represents an SSL user's extra data
  52  */
  53 class issl_session : public classbase
  54 {
  55 public:
  56         gnutls_session_t sess;
  57         issl_status status;
  58         std::string outbuf;
  59         int inbufoffset;
  60         char* inbuf;
  61         int fd;
  62 };
  63
  64 class ModuleSSLGnuTLS : public Module
  65 {
  66
  67         ConfigReader* Conf;
  68
  69         char* dummy;
  70
  71         std::vector<int> listenports;
  72
  73         int inbufsize;
  74         issl_session sessions[MAX_DESCRIPTORS];
  75
  76         gnutls_certificate_credentials x509_cred;
  77         gnutls_dh_params dh_params;
  78
  79         std::string keyfile;
  80         std::string certfile;
  81         std::string cafile;
  82         std::string crlfile;
  83         int dh_bits;
  84
  85         int clientactive;
  86
  87  public:
  88
  89         ModuleSSLGnuTLS(InspIRCd* Me)
  90                 : Module(Me)
  91         {
  92                 ServerInstance->PublishInterface("InspSocketHook", this);
  93
  94                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
  95                 inbufsize = ServerInstance->Config->NetBufferSize;
  96
  97                 gnutls_global_init(); // This must be called once in the program
  98
  99                 if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
 100                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
 101
 102                 // Guessing return meaning
 103                 if(gnutls_dh_params_init(&dh_params) < 0)
 104                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters");
 105
 106                 // Needs the flag as it ignores a plain /rehash
 107                 OnRehash(NULL,"ssl");
 108
 109                 // Void return, guess we assume success
 110                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 111         }
 112
 113         virtual void OnRehash(userrec* user, const std::string &param)
 114         {
 115                 if(param != "ssl")
 116                         return;
 117
 118                 Conf = new ConfigReader(ServerInstance);
 119
 120                 for(unsigned int i = 0; i < listenports.size(); i++)
 121                 {
 122                         ServerInstance->Config->DelIOHook(listenports[i]);
 123                 }
 124
 125                 listenports.clear();
 126                 clientactive = 0;
 127
 128                 for(int i = 0; i < Conf->Enumerate("bind"); i++)
 129                 {
 130                         // For each <bind> tag
 131                         std::string x = Conf->ReadValue("bind", "type", i);
 132                         if(((x.empty()) || (x == "clients")) && (x == "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                                         clientactive++;
 141                                         try
 142                                         {
 143                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 144                                                 {
 145                                                         listenports.push_back(portno);
 146                                                         for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 147                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 148                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 149                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portno);
 150                                                 }
 151                                                 else
 152                                                 {
 153                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 154                                                 }
 155                                         }
 156                                         catch (ModuleException &e)
 157                                         {
 158                                                 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());
 159                                         }
 160                                 }
 161                         }
 162                 }
 163
 164                 std::string confdir(ServerInstance->ConfigFileName);
 165                 // +1 so we the path ends with a /
 166                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 167
 168                 cafile  = Conf->ReadValue("gnutls", "cafile", 0);
 169                 crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
 170                 certfile        = Conf->ReadValue("gnutls", "certfile", 0);
 171                 keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
 172                 dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
 173
 174                 // Set all the default values needed.
 175                 if (cafile.empty())
 176                         cafile = "ca.pem";
 177
 178                 if (crlfile.empty())
 179                         crlfile = "crl.pem";
 180
 181                 if (certfile.empty())
 182                         certfile = "cert.pem";
 183
 184                 if (keyfile.empty())
 185                         keyfile = "key.pem";
 186
 187                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 188                         dh_bits = 1024;
 189
 190                 // Prepend relative paths with the path to the config directory.
 191                 if(cafile[0] != '/')
 192                         cafile = confdir + cafile;
 193
 194                 if(crlfile[0] != '/')
 195                         crlfile = confdir + crlfile;
 196
 197                 if(certfile[0] != '/')
 198                         certfile = confdir + certfile;
 199
 200                 if(keyfile[0] != '/')
 201                         keyfile = confdir + keyfile;
 202
 203                 int ret;
 204
 205                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 206                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
 207
 208                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 209                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
 210
 211                 // Guessing on the return value of this, manual doesn't say :|
 212                 if((ret = gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 213                         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));
 214
 215                 // This may be on a large (once a day or week) timer eventually.
 216                 GenerateDHParams();
 217
 218                 DELETE(Conf);
 219         }
 220
 221         void GenerateDHParams()
 222         {
 223                 // Generate Diffie Hellman parameters - for use with DHE
 224                 // kx algorithms. These should be discarded and regenerated
 225                 // once a day, once a week or once a month. Depending on the
 226                 // security requirements.
 227
 228                 int ret;
 229
 230                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 231                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 232         }
 233
 234         virtual ~ModuleSSLGnuTLS()
 235         {
 236                 gnutls_dh_params_deinit(dh_params);
 237                 gnutls_certificate_free_credentials(x509_cred);
 238                 gnutls_global_deinit();
 239         }
 240
 241         virtual void OnCleanup(int target_type, void* item)
 242         {
 243                 if(target_type == TYPE_USER)
 244                 {
 245                         userrec* user = (userrec*)item;
 246
 247                         if(user->GetExt("ssl", dummy) && isin(user->GetPort(), listenports))
 248                         {
 249                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 250                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 251                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 252                         }
 253                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 254                         {
 255                                 ssl_cert* tofree;
 256                                 user->GetExt("ssl_cert", tofree);
 257                                 delete tofree;
 258                                 user->Shrink("ssl_cert");
 259                         }
 260                 }
 261         }
 262
 263         virtual void OnUnloadModule(Module* mod, const std::string &name)
 264         {
 265                 if(mod == this)
 266                 {
 267                         for(unsigned int i = 0; i < listenports.size(); i++)
 268                         {
 269                                 ServerInstance->Config->DelIOHook(listenports[i]);
 270                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 271                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 272                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 273                         }
 274                 }
 275         }
 276
 277         virtual Version GetVersion()
 278         {
 279                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 280         }
 281
 282         void Implements(char* List)
 283         {
 284                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 285                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 286         }
 287
 288         virtual char* OnRequest(Request* request)
 289         {
 290                 ISHRequest* ISR = (ISHRequest*)request;
 291                 if (strcmp("IS_NAME", request->GetId()) == 0)
 292                 {
 293                         return "gnutls";
 294                 }
 295                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 296                 {
 297                         char* ret = "OK";
 298                         try
 299                         {
 300                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 301                         }
 302                         catch (ModuleException &e)
 303                         {
 304                                 return NULL;
 305                         }
 306                         return ret;
 307                 }
 308                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 309                 {
 310                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 311                 }
 312                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 313                 {
 314                         if (ISR->Sock->GetFd() < 0)
 315                                 return (char*)"OK";
 316
 317                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 318                         return (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) ? NULL : (char*)"OK";
 319                 }
 320                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 321                 {
 322                         if (ISR->Sock->GetFd() > -1)
 323                         {
 324                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 325                                 if (session->sess)
 326                                 {
 327                                         if ((Extensible*)ServerInstance->FindDescriptor(ISR->Sock->GetFd()) == (Extensible*)(ISR->Sock))
 328                                         {
 329                                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 330                                                 return "OK";
 331                                         }
 332                                 }
 333                         }
 334                 }
 335                 return NULL;
 336         }
 337
 338
 339         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 340         {
 341                 issl_session* session = &sessions[fd];
 342
 343                 session->fd = fd;
 344                 session->inbuf = new char[inbufsize];
 345                 session->inbufoffset = 0;
 346
 347                 gnutls_init(&session->sess, GNUTLS_SERVER);
 348
 349                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 350                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 351                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 352
 353                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 354                  * This needs testing, but it's easy enough to rollback if need be
 355                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 356                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 357                  *
 358                  * With testing this seems to...not work :/
 359                  */
 360
 361                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 362
 363                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 364
 365                 Handshake(session);
 366         }
 367
 368         virtual void OnRawSocketConnect(int fd)
 369         {
 370                 issl_session* session = &sessions[fd];
 371
 372                 session->fd = fd;
 373                 session->inbuf = new char[inbufsize];
 374                 session->inbufoffset = 0;
 375
 376                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 377
 378                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 379                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 380                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 381                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 382
 383                 Handshake(session);
 384         }
 385
 386         virtual void OnRawSocketClose(int fd)
 387         {
 388                 CloseSession(&sessions[fd]);
 389
 390                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 391
 392                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 393                 {
 394                         ssl_cert* tofree;
 395                         user->GetExt("ssl_cert", tofree);
 396                         delete tofree;
 397                         user->Shrink("ssl_cert");
 398                 }
 399         }
 400
 401         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 402         {
 403                 issl_session* session = &sessions[fd];
 404
 405                 if (!session->sess)
 406                 {
 407                         readresult = 0;
 408                         CloseSession(session);
 409                         return 1;
 410                 }
 411
 412                 if (session->status == ISSL_HANDSHAKING_READ)
 413                 {
 414                         // The handshake isn't finished, try to finish it.
 415
 416                         if(!Handshake(session))
 417                         {
 418                                 // Couldn't resume handshake.
 419                                 return -1;
 420                         }
 421                 }
 422                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 423                 {
 424                         errno = EAGAIN;
 425                         return -1;
 426                 }
 427
 428                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 429
 430                 if (session->status == ISSL_HANDSHAKEN)
 431                 {
 432                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 433                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 434                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 435
 436                         if (ret == 0)
 437                         {
 438                                 // Client closed connection.
 439                                 readresult = 0;
 440                                 CloseSession(session);
 441                                 return 1;
 442                         }
 443                         else if (ret < 0)
 444                         {
 445                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 446                                 {
 447                                         errno = EAGAIN;
 448                                         return -1;
 449                                 }
 450                                 else
 451                                 {
 452                                         readresult = 0;
 453                                         CloseSession(session);
 454                                 }
 455                         }
 456                         else
 457                         {
 458                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 459                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 460                                 // 'buffer' is 'count' long
 461
 462                                 unsigned int length = ret + session->inbufoffset;
 463
 464                                 if(count <= length)
 465                                 {
 466                                         memcpy(buffer, session->inbuf, count);
 467                                         // Move the stuff left in inbuf to the beginning of it
 468                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 469                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 470                                         session->inbufoffset = length - count;
 471                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 472                                         readresult = count;
 473                                 }
 474                                 else
 475                                 {
 476                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 477                                         memcpy(buffer, session->inbuf, length);
 478                                         // Zero the offset, as there's nothing there..
 479                                         session->inbufoffset = 0;
 480                                         // As above
 481                                         readresult = length;
 482                                 }
 483                         }
 484                 }
 485                 else if(session->status == ISSL_CLOSING)
 486                         readresult = 0;
 487
 488                 return 1;
 489         }
 490
 491         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 492         {
 493                 if (!count)
 494                         return 0;
 495
 496                 issl_session* session = &sessions[fd];
 497                 const char* sendbuffer = buffer;
 498
 499                 if (!session->sess)
 500                 {
 501                         CloseSession(session);
 502                         return 1;
 503                 }
 504
 505                 session->outbuf.append(sendbuffer, count);
 506                 sendbuffer = session->outbuf.c_str();
 507                 count = session->outbuf.size();
 508
 509                 if(session->status == ISSL_HANDSHAKING_WRITE)
 510                 {
 511                         // The handshake isn't finished, try to finish it.
 512                         Handshake(session);
 513                         errno = EAGAIN;
 514                         return -1;
 515                 }
 516
 517                 int ret = 0;
 518
 519                 if(session->status == ISSL_HANDSHAKEN)
 520                 {
 521                         ret = gnutls_record_send(session->sess, sendbuffer, count);
 522
 523                         if(ret == 0)
 524                         {
 525                                 CloseSession(session);
 526                         }
 527                         else if (ret < 0)
 528                         {
 529                                 if(ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)
 530                                 {
 531                                         CloseSession(session);
 532                                 }
 533                                 else
 534                                 {
 535                                         errno = EAGAIN;
 536                                         return -1;
 537                                 }
 538                         }
 539                         else
 540                         {
 541                                 session->outbuf = session->outbuf.substr(ret);
 542                         }
 543                 }
 544
 545                 /* Who's smart idea was it to return 1 when we havent written anything?
 546                  * This fucks the buffer up in InspSocket :p
 547                  */
 548                 return ret < 1 ? 0 : ret;
 549         }
 550
 551         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 552         virtual void OnWhois(userrec* source, userrec* dest)
 553         {
 554                 if (!clientactive)
 555                         return;
 556
 557                 // Bugfix, only send this numeric for *our* SSL users
 558                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 559                 {
 560                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 561                 }
 562         }
 563
 564         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 565         {
 566                 // check if the linking module wants to know about OUR metadata
 567                 if(extname == "ssl")
 568                 {
 569                         // check if this user has an swhois field to send
 570                         if(user->GetExt(extname, dummy))
 571                         {
 572                                 // call this function in the linking module, let it format the data how it
 573                                 // sees fit, and send it on its way. We dont need or want to know how.
 574                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 575                         }
 576                 }
 577         }
 578
 579         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 580         {
 581                 // check if its our metadata key, and its associated with a user
 582                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 583                 {
 584                         userrec* dest = (userrec*)target;
 585                         // if they dont already have an ssl flag, accept the remote server's
 586                         if (!dest->GetExt(extname, dummy))
 587                         {
 588                                 dest->Extend(extname, "ON");
 589                         }
 590                 }
 591         }
 592
 593         bool Handshake(issl_session* session)
 594         {
 595                 int ret = gnutls_handshake(session->sess);
 596
 597                 if (ret < 0)
 598                 {
 599                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 600                         {
 601                                 // Handshake needs resuming later, read() or write() would have blocked.
 602
 603                                 if(gnutls_record_get_direction(session->sess) == 0)
 604                                 {
 605                                         // gnutls_handshake() wants to read() again.
 606                                         session->status = ISSL_HANDSHAKING_READ;
 607                                 }
 608                                 else
 609                                 {
 610                                         // gnutls_handshake() wants to write() again.
 611                                         session->status = ISSL_HANDSHAKING_WRITE;
 612                                         MakePollWrite(session);
 613                                 }
 614                         }
 615                         else
 616                         {
 617                                 // Handshake failed.
 618                                 CloseSession(session);
 619                                 session->status = ISSL_CLOSING;
 620                         }
 621
 622                         return false;
 623                 }
 624                 else
 625                 {
 626                         // Handshake complete.
 627                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 628                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 629                         if (extendme)
 630                         {
 631                                 if (!extendme->GetExt("ssl", dummy))
 632                                         extendme->Extend("ssl", "ON");
 633                         }
 634
 635                         // Change the seesion state
 636                         session->status = ISSL_HANDSHAKEN;
 637
 638                         // Finish writing, if any left
 639                         MakePollWrite(session);
 640
 641                         return true;
 642                 }
 643         }
 644
 645         virtual void OnPostConnect(userrec* user)
 646         {
 647                 // This occurs AFTER OnUserConnect so we can be sure the
 648                 // protocol module has propogated the NICK message.
 649                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 650                 {
 651                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 652                         std::deque<std::string>* metadata = new std::deque<std::string>;
 653                         metadata->push_back(user->nick);
 654                         metadata->push_back("ssl");             // The metadata id
 655                         metadata->push_back("ON");              // The value to send
 656                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 657                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 658                         DELETE(event);
 659                         DELETE(metadata);
 660
 661                         VerifyCertificate(&sessions[user->GetFd()],user);
 662                         if (sessions[user->GetFd()].sess)
 663                         {
 664                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 665                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 666                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 667                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, cipher.c_str());
 668                         }
 669                 }
 670         }
 671
 672         void MakePollWrite(issl_session* session)
 673         {
 674                 OnRawSocketWrite(session->fd, NULL, 0);
 675         }
 676
 677         void CloseSession(issl_session* session)
 678         {
 679                 if(session->sess)
 680                 {
 681                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 682                         gnutls_deinit(session->sess);
 683                 }
 684
 685                 if(session->inbuf)
 686                 {
 687                         delete[] session->inbuf;
 688                 }
 689
 690                 session->outbuf.clear();
 691                 session->inbuf = NULL;
 692                 session->sess = NULL;
 693                 session->status = ISSL_NONE;
 694         }
 695
 696         void VerifyCertificate(issl_session* session, Extensible* user)
 697         {
 698                 if (!session->sess || !user)
 699                         return;
 700
 701                 unsigned int status;
 702                 const gnutls_datum_t* cert_list;
 703                 int ret;
 704                 unsigned int cert_list_size;
 705                 gnutls_x509_crt_t cert;
 706                 char name[MAXBUF];
 707                 unsigned char digest[MAXBUF];
 708                 size_t digest_size = sizeof(digest);
 709                 size_t name_size = sizeof(name);
 710                 ssl_cert* certinfo = new ssl_cert;
 711
 712                 user->Extend("ssl_cert",certinfo);
 713
 714                 /* This verification function uses the trusted CAs in the credentials
 715                  * structure. So you must have installed one or more CA certificates.
 716                  */
 717                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 718
 719                 if (ret < 0)
 720                 {
 721                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 722                         return;
 723                 }
 724
 725                 if (status & GNUTLS_CERT_INVALID)
 726                 {
 727                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 728                 }
 729                 else
 730                 {
 731                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 732                 }
 733                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 734                 {
 735                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 736                 }
 737                 else
 738                 {
 739                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 740                 }
 741                 if (status & GNUTLS_CERT_REVOKED)
 742                 {
 743                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 744                 }
 745                 else
 746                 {
 747                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 748                 }
 749                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 750                 {
 751                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 752                 }
 753                 else
 754                 {
 755                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 756                 }
 757
 758                 /* Up to here the process is the same for X.509 certificates and
 759                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 760                  * be easily extended to work with openpgp keys as well.
 761                  */
 762                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 763                 {
 764                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 765                         return;
 766                 }
 767
 768                 ret = gnutls_x509_crt_init(&cert);
 769                 if (ret < 0)
 770                 {
 771                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 772                         return;
 773                 }
 774
 775                 cert_list_size = 0;
 776                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 777                 if (cert_list == NULL)
 778                 {
 779                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 780                         return;
 781                 }
 782
 783                 /* This is not a real world example, since we only check the first
 784                  * certificate in the given chain.
 785                  */
 786
 787                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 788                 if (ret < 0)
 789                 {
 790                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 791                         return;
 792                 }
 793
 794                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 795
 796                 certinfo->data.insert(std::make_pair("dn",name));
 797
 798                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 799
 800                 certinfo->data.insert(std::make_pair("issuer",name));
 801
 802                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 803                 {
 804                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 805                 }
 806                 else
 807                 {
 808                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 809                 }
 810
 811                 /* Beware here we do not check for errors.
 812                  */
 813                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 814                 {
 815                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 816                 }
 817
 818                 gnutls_x509_crt_deinit(cert);
 819
 820                 return;
 821         }
 822
 823 };
 824
 825 class ModuleSSLGnuTLSFactory : public ModuleFactory
 826 {
 827  public:
 828         ModuleSSLGnuTLSFactory()
 829         {
 830         }
 831
 832         ~ModuleSSLGnuTLSFactory()
 833         {
 834         }
 835
 836         virtual Module * CreateModule(InspIRCd* Me)
 837         {
 838                 return new ModuleSSLGnuTLS(Me);
 839         }
 840 };
 841
 842
 843 extern "C" DllExport void * init_module( void )
 844 {
 845         return new ModuleSSLGnuTLSFactory;
 846 }