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                         if (ISR->Sock->GetFd() < 0)
 313                                 return (char*)"OK";
 314
 315                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 316                         return (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) ? NULL : (char*)"OK";
 317                 }
 318                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 319                 {
 320                         if (ISR->Sock->GetFd() > -1)
 321                         {
 322                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 323                                 if (session->sess)
 324                                 {
 325                                         if ((Extensible*)ServerInstance->FindDescriptor(ISR->Sock->GetFd()) == (Extensible*)(ISR->Sock))
 326                                         {
 327                                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 328                                                 return "OK";
 329                                         }
 330                                 }
 331                         }
 332                 }
 333                 return NULL;
 334         }
 335
 336
 337         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 338         {
 339                 issl_session* session = &sessions[fd];
 340
 341                 session->fd = fd;
 342                 session->inbuf = new char[inbufsize];
 343                 session->inbufoffset = 0;
 344
 345                 gnutls_init(&session->sess, GNUTLS_SERVER);
 346
 347                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 348                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 349                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 350
 351                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 352                  * This needs testing, but it's easy enough to rollback if need be
 353                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 354                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 355                  *
 356                  * With testing this seems to...not work :/
 357                  */
 358
 359                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 360
 361                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 362
 363                 Handshake(session);
 364         }
 365
 366         virtual void OnRawSocketConnect(int fd)
 367         {
 368                 issl_session* session = &sessions[fd];
 369
 370                 session->fd = fd;
 371                 session->inbuf = new char[inbufsize];
 372                 session->inbufoffset = 0;
 373
 374                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 375
 376                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 377                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 378                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 379                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 380
 381                 Handshake(session);
 382         }
 383
 384         virtual void OnRawSocketClose(int fd)
 385         {
 386                 ServerInstance->Log(DEBUG,"Close 3");
 387                 CloseSession(&sessions[fd]);
 388
 389                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 390
 391                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 392                 {
 393                         ssl_cert* tofree;
 394                         user->GetExt("ssl_cert", tofree);
 395                         delete tofree;
 396                         user->Shrink("ssl_cert");
 397                 }
 398         }
 399
 400         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 401         {
 402                 issl_session* session = &sessions[fd];
 403
 404                 if (!session->sess)
 405                 {
 406                         readresult = 0;
 407                         ServerInstance->Log(DEBUG,"Close 4");
 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                                 ServerInstance->Log(DEBUG,"Close 5");
 441                                 CloseSession(session);
 442                                 return 1;
 443                         }
 444                         else if (ret < 0)
 445                         {
 446                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 447                                 {
 448                                         errno = EAGAIN;
 449                                         return -1;
 450                                 }
 451                                 else
 452                                 {
 453                                         readresult = 0;
 454                                         ServerInstance->Log(DEBUG,"Close 6");
 455                                         CloseSession(session);
 456                                 }
 457                         }
 458                         else
 459                         {
 460                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 461                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 462                                 // 'buffer' is 'count' long
 463
 464                                 unsigned int length = ret + session->inbufoffset;
 465
 466                                 if(count <= length)
 467                                 {
 468                                         memcpy(buffer, session->inbuf, count);
 469                                         // Move the stuff left in inbuf to the beginning of it
 470                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 471                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 472                                         session->inbufoffset = length - count;
 473                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 474                                         readresult = count;
 475                                 }
 476                                 else
 477                                 {
 478                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 479                                         memcpy(buffer, session->inbuf, length);
 480                                         // Zero the offset, as there's nothing there..
 481                                         session->inbufoffset = 0;
 482                                         // As above
 483                                         readresult = length;
 484                                 }
 485                         }
 486                 }
 487                 else if(session->status == ISSL_CLOSING)
 488                         readresult = 0;
 489
 490                 return 1;
 491         }
 492
 493         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 494         {
 495                 if (!count)
 496                         return 0;
 497
 498                 issl_session* session = &sessions[fd];
 499                 const char* sendbuffer = buffer;
 500
 501                 if (!session->sess)
 502                 {
 503                         ServerInstance->Log(DEBUG,"Close 7");
 504                         CloseSession(session);
 505                         return 1;
 506                 }
 507
 508                 session->outbuf.append(sendbuffer, count);
 509                 sendbuffer = session->outbuf.c_str();
 510                 count = session->outbuf.size();
 511
 512                 if(session->status == ISSL_HANDSHAKING_WRITE)
 513                 {
 514                         // The handshake isn't finished, try to finish it.
 515                         Handshake(session);
 516                         errno = EAGAIN;
 517                         return -1;
 518                 }
 519
 520                 int ret = 0;
 521
 522                 if(session->status == ISSL_HANDSHAKEN)
 523                 {
 524                         ret = gnutls_record_send(session->sess, sendbuffer, count);
 525
 526                         if(ret == 0)
 527                         {
 528                                 ServerInstance->Log(DEBUG,"Close 1");
 529                                 CloseSession(session);
 530                         }
 531                         else if (ret < 0)
 532                         {
 533                                 if(ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)
 534                                 {
 535                                         ServerInstance->Log(DEBUG,"Close 7");
 536                                         CloseSession(session);
 537                                 }
 538                                 else
 539                                 {
 540                                         errno = EAGAIN;
 541                                         return -1;
 542                                 }
 543                         }
 544                         else
 545                         {
 546                                 session->outbuf = session->outbuf.substr(ret);
 547                         }
 548                 }
 549
 550                 /* Who's smart idea was it to return 1 when we havent written anything?
 551                  * This fucks the buffer up in InspSocket :p
 552                  */
 553                 return ret < 1 ? 0 : ret;
 554         }
 555
 556         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 557         virtual void OnWhois(userrec* source, userrec* dest)
 558         {
 559                 if (!clientactive)
 560                         return;
 561
 562                 // Bugfix, only send this numeric for *our* SSL users
 563                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 564                 {
 565                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 566                 }
 567         }
 568
 569         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 570         {
 571                 // check if the linking module wants to know about OUR metadata
 572                 if(extname == "ssl")
 573                 {
 574                         // check if this user has an swhois field to send
 575                         if(user->GetExt(extname, dummy))
 576                         {
 577                                 // call this function in the linking module, let it format the data how it
 578                                 // sees fit, and send it on its way. We dont need or want to know how.
 579                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 580                         }
 581                 }
 582         }
 583
 584         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 585         {
 586                 // check if its our metadata key, and its associated with a user
 587                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 588                 {
 589                         userrec* dest = (userrec*)target;
 590                         // if they dont already have an ssl flag, accept the remote server's
 591                         if (!dest->GetExt(extname, dummy))
 592                         {
 593                                 dest->Extend(extname, "ON");
 594                         }
 595                 }
 596         }
 597
 598         bool Handshake(issl_session* session)
 599         {
 600                 int ret = gnutls_handshake(session->sess);
 601
 602                 if (ret < 0)
 603                 {
 604                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 605                         {
 606                                 // Handshake needs resuming later, read() or write() would have blocked.
 607
 608                                 if(gnutls_record_get_direction(session->sess) == 0)
 609                                 {
 610                                         // gnutls_handshake() wants to read() again.
 611                                         session->status = ISSL_HANDSHAKING_READ;
 612                                 }
 613                                 else
 614                                 {
 615                                         // gnutls_handshake() wants to write() again.
 616                                         session->status = ISSL_HANDSHAKING_WRITE;
 617                                         MakePollWrite(session);
 618                                 }
 619                         }
 620                         else
 621                         {
 622                                 // Handshake failed.
 623                                 ServerInstance->Log(DEBUG,"Close 2");
 624                                 CloseSession(session);
 625                                 session->status = ISSL_CLOSING;
 626                         }
 627
 628                         return false;
 629                 }
 630                 else
 631                 {
 632                         // Handshake complete.
 633                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 634                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 635                         if (extendme)
 636                         {
 637                                 if (!extendme->GetExt("ssl", dummy))
 638                                         extendme->Extend("ssl", "ON");
 639                         }
 640
 641                         // Change the seesion state
 642                         session->status = ISSL_HANDSHAKEN;
 643
 644                         // Finish writing, if any left
 645                         MakePollWrite(session);
 646
 647                         return true;
 648                 }
 649         }
 650
 651         virtual void OnPostConnect(userrec* user)
 652         {
 653                 // This occurs AFTER OnUserConnect so we can be sure the
 654                 // protocol module has propogated the NICK message.
 655                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 656                 {
 657                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 658                         std::deque<std::string>* metadata = new std::deque<std::string>;
 659                         metadata->push_back(user->nick);
 660                         metadata->push_back("ssl");             // The metadata id
 661                         metadata->push_back("ON");              // The value to send
 662                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 663                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 664                         DELETE(event);
 665                         DELETE(metadata);
 666
 667                         VerifyCertificate(&sessions[user->GetFd()],user);
 668                 }
 669         }
 670
 671         void MakePollWrite(issl_session* session)
 672         {
 673                 OnRawSocketWrite(session->fd, NULL, 0);
 674         }
 675
 676         void CloseSession(issl_session* session)
 677         {
 678                 if(session->sess)
 679                 {
 680                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 681                         gnutls_deinit(session->sess);
 682                 }
 683
 684                 if(session->inbuf)
 685                 {
 686                         delete[] session->inbuf;
 687                 }
 688
 689                 session->outbuf.clear();
 690                 session->inbuf = NULL;
 691                 session->sess = NULL;
 692                 session->status = ISSL_NONE;
 693         }
 694
 695         void VerifyCertificate(issl_session* session, Extensible* user)
 696         {
 697                 if (!session->sess || !user)
 698                         return;
 699
 700                 unsigned int status;
 701                 const gnutls_datum_t* cert_list;
 702                 int ret;
 703                 unsigned int cert_list_size;
 704                 gnutls_x509_crt_t cert;
 705                 char name[MAXBUF];
 706                 unsigned char digest[MAXBUF];
 707                 size_t digest_size = sizeof(digest);
 708                 size_t name_size = sizeof(name);
 709                 ssl_cert* certinfo = new ssl_cert;
 710
 711                 user->Extend("ssl_cert",certinfo);
 712
 713                 /* This verification function uses the trusted CAs in the credentials
 714                  * structure. So you must have installed one or more CA certificates.
 715                  */
 716                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 717
 718                 if (ret < 0)
 719                 {
 720                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 721                         return;
 722                 }
 723
 724                 if (status & GNUTLS_CERT_INVALID)
 725                 {
 726                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 727                 }
 728                 else
 729                 {
 730                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 731                 }
 732                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 733                 {
 734                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 735                 }
 736                 else
 737                 {
 738                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 739                 }
 740                 if (status & GNUTLS_CERT_REVOKED)
 741                 {
 742                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 743                 }
 744                 else
 745                 {
 746                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 747                 }
 748                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 749                 {
 750                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 751                 }
 752                 else
 753                 {
 754                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 755                 }
 756
 757                 /* Up to here the process is the same for X.509 certificates and
 758                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 759                  * be easily extended to work with openpgp keys as well.
 760                  */
 761                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 762                 {
 763                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 764                         return;
 765                 }
 766
 767                 ret = gnutls_x509_crt_init(&cert);
 768                 if (ret < 0)
 769                 {
 770                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 771                         return;
 772                 }
 773
 774                 cert_list_size = 0;
 775                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 776                 if (cert_list == NULL)
 777                 {
 778                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 779                         return;
 780                 }
 781
 782                 /* This is not a real world example, since we only check the first
 783                  * certificate in the given chain.
 784                  */
 785
 786                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 787                 if (ret < 0)
 788                 {
 789                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 790                         return;
 791                 }
 792
 793                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 794
 795                 certinfo->data.insert(std::make_pair("dn",name));
 796
 797                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 798
 799                 certinfo->data.insert(std::make_pair("issuer",name));
 800
 801                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 802                 {
 803                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 804                 }
 805                 else
 806                 {
 807                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 808                 }
 809
 810                 /* Beware here we do not check for errors.
 811                  */
 812                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 813                 {
 814                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 815                 }
 816
 817                 gnutls_x509_crt_deinit(cert);
 818
 819                 return;
 820         }
 821
 822 };
 823
 824 class ModuleSSLGnuTLSFactory : public ModuleFactory
 825 {
 826  public:
 827         ModuleSSLGnuTLSFactory()
 828         {
 829         }
 830
 831         ~ModuleSSLGnuTLSFactory()
 832         {
 833         }
 834
 835         virtual Module * CreateModule(InspIRCd* Me)
 836         {
 837                 return new ModuleSSLGnuTLS(Me);
 838         }
 839 };
 840
 841
 842 extern "C" void * init_module( void )
 843 {
 844         return new ModuleSSLGnuTLSFactory;
 845 }