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