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 #ifdef WINDOWS
  33 #pragma comment(lib, "libgnutls-13.lib")
  34 #undef MAX_DESCRIPTORS
  35 #define MAX_DESCRIPTORS 10000
  36 #endif
  37
  38 /* $ModDesc: Provides SSL support for clients */
  39 /* $CompileFlags: exec("libgnutls-config --cflags") */
  40 /* $LinkerFlags: rpath("libgnutls-config --libs") exec("libgnutls-config --libs") */
  41 /* $ModDep: transport.h */
  42
  43
  44 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  45
  46 bool isin(int port, const std::vector<int> &portlist)
  47 {
  48         for(unsigned int i = 0; i < portlist.size(); i++)
  49                 if(portlist[i] == port)
  50                         return true;
  51
  52         return false;
  53 }
  54
  55 /** Represents an SSL user's extra data
  56  */
  57 class issl_session : public classbase
  58 {
  59 public:
  60         gnutls_session_t sess;
  61         issl_status status;
  62         std::string outbuf;
  63         int inbufoffset;
  64         char* inbuf;
  65         int fd;
  66 };
  67
  68 class ModuleSSLGnuTLS : public Module
  69 {
  70
  71         ConfigReader* Conf;
  72
  73         char* dummy;
  74
  75         std::vector<int> listenports;
  76
  77         int inbufsize;
  78         issl_session sessions[MAX_DESCRIPTORS];
  79
  80         gnutls_certificate_credentials x509_cred;
  81         gnutls_dh_params dh_params;
  82
  83         std::string keyfile;
  84         std::string certfile;
  85         std::string cafile;
  86         std::string crlfile;
  87         int dh_bits;
  88
  89         int clientactive;
  90
  91  public:
  92
  93         ModuleSSLGnuTLS(InspIRCd* Me)
  94                 : Module(Me)
  95         {
  96                 ServerInstance->PublishInterface("InspSocketHook", this);
  97
  98                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
  99                 inbufsize = ServerInstance->Config->NetBufferSize;
 100
 101                 gnutls_global_init(); // This must be called once in the program
 102
 103                 if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
 104                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
 105
 106                 // Guessing return meaning
 107                 if(gnutls_dh_params_init(&dh_params) < 0)
 108                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters");
 109
 110                 // Needs the flag as it ignores a plain /rehash
 111                 OnRehash(NULL,"ssl");
 112
 113                 // Void return, guess we assume success
 114                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 115         }
 116
 117         virtual void OnRehash(userrec* user, const std::string &param)
 118         {
 119                 if(param != "ssl")
 120                         return;
 121
 122                 Conf = new ConfigReader(ServerInstance);
 123
 124                 for(unsigned int i = 0; i < listenports.size(); i++)
 125                 {
 126                         ServerInstance->Config->DelIOHook(listenports[i]);
 127                 }
 128
 129                 listenports.clear();
 130                 clientactive = 0;
 131
 132                 for(int i = 0; i < Conf->Enumerate("bind"); i++)
 133                 {
 134                         // For each <bind> tag
 135                         if(((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "gnutls"))
 136                         {
 137                                 // Get the port we're meant to be listening on with SSL
 138                                 std::string port = Conf->ReadValue("bind", "port", i);
 139                                 irc::portparser portrange(port, false);
 140                                 long portno = -1;
 141                                 while ((portno = portrange.GetToken()))
 142                                 {
 143                                         clientactive++;
 144                                         try
 145                                         {
 146                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 147                                                 {
 148                                                         listenports.push_back(portno);
 149                                                         for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 150                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 151                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 152                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portno);
 153                                                 }
 154                                                 else
 155                                                 {
 156                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 157                                                 }
 158                                         }
 159                                         catch (ModuleException &e)
 160                                         {
 161                                                 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());
 162                                         }
 163                                 }
 164                         }
 165                 }
 166
 167                 std::string confdir(ServerInstance->ConfigFileName);
 168                 // +1 so we the path ends with a /
 169                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 170
 171                 cafile  = Conf->ReadValue("gnutls", "cafile", 0);
 172                 crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
 173                 certfile        = Conf->ReadValue("gnutls", "certfile", 0);
 174                 keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
 175                 dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
 176
 177                 // Set all the default values needed.
 178                 if(cafile == "")
 179                         cafile = "ca.pem";
 180
 181                 if(crlfile == "")
 182                         crlfile = "crl.pem";
 183
 184                 if(certfile == "")
 185                         certfile = "cert.pem";
 186
 187                 if(keyfile == "")
 188                         keyfile = "key.pem";
 189
 190                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 191                         dh_bits = 1024;
 192
 193                 // Prepend relative paths with the path to the config directory.
 194                 if(cafile[0] != '/')
 195                         cafile = confdir + cafile;
 196
 197                 if(crlfile[0] != '/')
 198                         crlfile = confdir + crlfile;
 199
 200                 if(certfile[0] != '/')
 201                         certfile = confdir + certfile;
 202
 203                 if(keyfile[0] != '/')
 204                         keyfile = confdir + keyfile;
 205
 206                 int ret;
 207
 208                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 209                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
 210
 211                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 212                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
 213
 214                 // Guessing on the return value of this, manual doesn't say :|
 215                 if((ret = gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 216                         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));
 217
 218                 // This may be on a large (once a day or week) timer eventually.
 219                 GenerateDHParams();
 220
 221                 DELETE(Conf);
 222         }
 223
 224         void GenerateDHParams()
 225         {
 226                 // Generate Diffie Hellman parameters - for use with DHE
 227                 // kx algorithms. These should be discarded and regenerated
 228                 // once a day, once a week or once a month. Depending on the
 229                 // security requirements.
 230
 231                 int ret;
 232
 233                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 234                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 235         }
 236
 237         virtual ~ModuleSSLGnuTLS()
 238         {
 239                 gnutls_dh_params_deinit(dh_params);
 240                 gnutls_certificate_free_credentials(x509_cred);
 241                 gnutls_global_deinit();
 242         }
 243
 244         virtual void OnCleanup(int target_type, void* item)
 245         {
 246                 if(target_type == TYPE_USER)
 247                 {
 248                         userrec* user = (userrec*)item;
 249
 250                         if(user->GetExt("ssl", dummy) && isin(user->GetPort(), listenports))
 251                         {
 252                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 253                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 254                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 255                         }
 256                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 257                         {
 258                                 ssl_cert* tofree;
 259                                 user->GetExt("ssl_cert", tofree);
 260                                 delete tofree;
 261                                 user->Shrink("ssl_cert");
 262                         }
 263                 }
 264         }
 265
 266         virtual void OnUnloadModule(Module* mod, const std::string &name)
 267         {
 268                 if(mod == this)
 269                 {
 270                         for(unsigned int i = 0; i < listenports.size(); i++)
 271                         {
 272                                 ServerInstance->Config->DelIOHook(listenports[i]);
 273                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 274                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 275                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 276                         }
 277                 }
 278         }
 279
 280         virtual Version GetVersion()
 281         {
 282                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 283         }
 284
 285         void Implements(char* List)
 286         {
 287                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 288                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 289         }
 290
 291         virtual char* OnRequest(Request* request)
 292         {
 293                 ISHRequest* ISR = (ISHRequest*)request;
 294                 if (strcmp("IS_NAME", request->GetId()) == 0)
 295                 {
 296                         return "gnutls";
 297                 }
 298                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 299                 {
 300                         char* ret = "OK";
 301                         try
 302                         {
 303                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 304                         }
 305                         catch (ModuleException &e)
 306                         {
 307                                 return NULL;
 308                         }
 309                         return ret;
 310                 }
 311                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 312                 {
 313                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 314                 }
 315                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 316                 {
 317                         if (ISR->Sock->GetFd() < 0)
 318                                 return (char*)"OK";
 319
 320                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 321                         return (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE) ? NULL : (char*)"OK";
 322                 }
 323                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 324                 {
 325                         if (ISR->Sock->GetFd() > -1)
 326                         {
 327                                 issl_session* session = &sessions[ISR->Sock->GetFd()];
 328                                 if (session->sess)
 329                                 {
 330                                         if ((Extensible*)ServerInstance->FindDescriptor(ISR->Sock->GetFd()) == (Extensible*)(ISR->Sock))
 331                                         {
 332                                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 333                                                 return "OK";
 334                                         }
 335                                 }
 336                         }
 337                 }
 338                 return NULL;
 339         }
 340
 341
 342         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 343         {
 344                 issl_session* session = &sessions[fd];
 345
 346                 session->fd = fd;
 347                 session->inbuf = new char[inbufsize];
 348                 session->inbufoffset = 0;
 349
 350                 gnutls_init(&session->sess, GNUTLS_SERVER);
 351
 352                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 353                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 354                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 355
 356                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 357                  * This needs testing, but it's easy enough to rollback if need be
 358                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 359                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 360                  *
 361                  * With testing this seems to...not work :/
 362                  */
 363
 364                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 365
 366                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 367
 368                 Handshake(session);
 369         }
 370
 371         virtual void OnRawSocketConnect(int fd)
 372         {
 373                 issl_session* session = &sessions[fd];
 374
 375                 session->fd = fd;
 376                 session->inbuf = new char[inbufsize];
 377                 session->inbufoffset = 0;
 378
 379                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 380
 381                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 382                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 383                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 384                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 385
 386                 Handshake(session);
 387         }
 388
 389         virtual void OnRawSocketClose(int fd)
 390         {
 391                 CloseSession(&sessions[fd]);
 392
 393                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 394
 395                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 396                 {
 397                         ssl_cert* tofree;
 398                         user->GetExt("ssl_cert", tofree);
 399                         delete tofree;
 400                         user->Shrink("ssl_cert");
 401                 }
 402         }
 403
 404         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 405         {
 406                 issl_session* session = &sessions[fd];
 407
 408                 if (!session->sess)
 409                 {
 410                         readresult = 0;
 411                         CloseSession(session);
 412                         return 1;
 413                 }
 414
 415                 if (session->status == ISSL_HANDSHAKING_READ)
 416                 {
 417                         // The handshake isn't finished, try to finish it.
 418
 419                         if(!Handshake(session))
 420                         {
 421                                 // Couldn't resume handshake.
 422                                 return -1;
 423                         }
 424                 }
 425                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 426                 {
 427                         errno = EAGAIN;
 428                         return -1;
 429                 }
 430
 431                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 432
 433                 if (session->status == ISSL_HANDSHAKEN)
 434                 {
 435                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 436                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 437                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 438
 439                         if (ret == 0)
 440                         {
 441                                 // Client closed connection.
 442                                 readresult = 0;
 443                                 CloseSession(session);
 444                                 return 1;
 445                         }
 446                         else if (ret < 0)
 447                         {
 448                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 449                                 {
 450                                         errno = EAGAIN;
 451                                         return -1;
 452                                 }
 453                                 else
 454                                 {
 455                                         readresult = 0;
 456                                         CloseSession(session);
 457                                 }
 458                         }
 459                         else
 460                         {
 461                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 462                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 463                                 // 'buffer' is 'count' long
 464
 465                                 unsigned int length = ret + session->inbufoffset;
 466
 467                                 if(count <= length)
 468                                 {
 469                                         memcpy(buffer, session->inbuf, count);
 470                                         // Move the stuff left in inbuf to the beginning of it
 471                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 472                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 473                                         session->inbufoffset = length - count;
 474                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 475                                         readresult = count;
 476                                 }
 477                                 else
 478                                 {
 479                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 480                                         memcpy(buffer, session->inbuf, length);
 481                                         // Zero the offset, as there's nothing there..
 482                                         session->inbufoffset = 0;
 483                                         // As above
 484                                         readresult = length;
 485                                 }
 486                         }
 487                 }
 488                 else if(session->status == ISSL_CLOSING)
 489                         readresult = 0;
 490
 491                 return 1;
 492         }
 493
 494         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 495         {
 496                 if (!count)
 497                         return 0;
 498
 499                 issl_session* session = &sessions[fd];
 500                 const char* sendbuffer = buffer;
 501
 502                 if (!session->sess)
 503                 {
 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                                 CloseSession(session);
 529                         }
 530                         else if (ret < 0)
 531                         {
 532                                 if(ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED)
 533                                 {
 534                                         CloseSession(session);
 535                                 }
 536                                 else
 537                                 {
 538                                         errno = EAGAIN;
 539                                         return -1;
 540                                 }
 541                         }
 542                         else
 543                         {
 544                                 session->outbuf = session->outbuf.substr(ret);
 545                         }
 546                 }
 547
 548                 /* Who's smart idea was it to return 1 when we havent written anything?
 549                  * This fucks the buffer up in InspSocket :p
 550                  */
 551                 return ret < 1 ? 0 : ret;
 552         }
 553
 554         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 555         virtual void OnWhois(userrec* source, userrec* dest)
 556         {
 557                 if (!clientactive)
 558                         return;
 559
 560                 // Bugfix, only send this numeric for *our* SSL users
 561                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 562                 {
 563                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 564                 }
 565         }
 566
 567         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 568         {
 569                 // check if the linking module wants to know about OUR metadata
 570                 if(extname == "ssl")
 571                 {
 572                         // check if this user has an swhois field to send
 573                         if(user->GetExt(extname, dummy))
 574                         {
 575                                 // call this function in the linking module, let it format the data how it
 576                                 // sees fit, and send it on its way. We dont need or want to know how.
 577                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 578                         }
 579                 }
 580         }
 581
 582         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 583         {
 584                 // check if its our metadata key, and its associated with a user
 585                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 586                 {
 587                         userrec* dest = (userrec*)target;
 588                         // if they dont already have an ssl flag, accept the remote server's
 589                         if (!dest->GetExt(extname, dummy))
 590                         {
 591                                 dest->Extend(extname, "ON");
 592                         }
 593                 }
 594         }
 595
 596         bool Handshake(issl_session* session)
 597         {
 598                 int ret = gnutls_handshake(session->sess);
 599
 600                 if (ret < 0)
 601                 {
 602                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 603                         {
 604                                 // Handshake needs resuming later, read() or write() would have blocked.
 605
 606                                 if(gnutls_record_get_direction(session->sess) == 0)
 607                                 {
 608                                         // gnutls_handshake() wants to read() again.
 609                                         session->status = ISSL_HANDSHAKING_READ;
 610                                 }
 611                                 else
 612                                 {
 613                                         // gnutls_handshake() wants to write() again.
 614                                         session->status = ISSL_HANDSHAKING_WRITE;
 615                                         MakePollWrite(session);
 616                                 }
 617                         }
 618                         else
 619                         {
 620                                 // Handshake failed.
 621                                 CloseSession(session);
 622                                 session->status = ISSL_CLOSING;
 623                         }
 624
 625                         return false;
 626                 }
 627                 else
 628                 {
 629                         // Handshake complete.
 630                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 631                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 632                         if (extendme)
 633                         {
 634                                 if (!extendme->GetExt("ssl", dummy))
 635                                         extendme->Extend("ssl", "ON");
 636                         }
 637
 638                         // Change the seesion state
 639                         session->status = ISSL_HANDSHAKEN;
 640
 641                         // Finish writing, if any left
 642                         MakePollWrite(session);
 643
 644                         return true;
 645                 }
 646         }
 647
 648         virtual void OnPostConnect(userrec* user)
 649         {
 650                 // This occurs AFTER OnUserConnect so we can be sure the
 651                 // protocol module has propogated the NICK message.
 652                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 653                 {
 654                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 655                         std::deque<std::string>* metadata = new std::deque<std::string>;
 656                         metadata->push_back(user->nick);
 657                         metadata->push_back("ssl");             // The metadata id
 658                         metadata->push_back("ON");              // The value to send
 659                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 660                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 661                         DELETE(event);
 662                         DELETE(metadata);
 663
 664                         VerifyCertificate(&sessions[user->GetFd()],user);
 665                         if (sessions[user->GetFd()].sess)
 666                         {
 667                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 668                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 669                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 670                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, cipher.c_str());
 671                         }
 672                 }
 673         }
 674
 675         void MakePollWrite(issl_session* session)
 676         {
 677                 OnRawSocketWrite(session->fd, NULL, 0);
 678         }
 679
 680         void CloseSession(issl_session* session)
 681         {
 682                 if(session->sess)
 683                 {
 684                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 685                         gnutls_deinit(session->sess);
 686                 }
 687
 688                 if(session->inbuf)
 689                 {
 690                         delete[] session->inbuf;
 691                 }
 692
 693                 session->outbuf.clear();
 694                 session->inbuf = NULL;
 695                 session->sess = NULL;
 696                 session->status = ISSL_NONE;
 697         }
 698
 699         void VerifyCertificate(issl_session* session, Extensible* user)
 700         {
 701                 if (!session->sess || !user)
 702                         return;
 703
 704                 unsigned int status;
 705                 const gnutls_datum_t* cert_list;
 706                 int ret;
 707                 unsigned int cert_list_size;
 708                 gnutls_x509_crt_t cert;
 709                 char name[MAXBUF];
 710                 unsigned char digest[MAXBUF];
 711                 size_t digest_size = sizeof(digest);
 712                 size_t name_size = sizeof(name);
 713                 ssl_cert* certinfo = new ssl_cert;
 714
 715                 user->Extend("ssl_cert",certinfo);
 716
 717                 /* This verification function uses the trusted CAs in the credentials
 718                  * structure. So you must have installed one or more CA certificates.
 719                  */
 720                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 721
 722                 if (ret < 0)
 723                 {
 724                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 725                         return;
 726                 }
 727
 728                 if (status & GNUTLS_CERT_INVALID)
 729                 {
 730                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 731                 }
 732                 else
 733                 {
 734                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 735                 }
 736                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 737                 {
 738                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 739                 }
 740                 else
 741                 {
 742                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 743                 }
 744                 if (status & GNUTLS_CERT_REVOKED)
 745                 {
 746                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 747                 }
 748                 else
 749                 {
 750                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 751                 }
 752                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 753                 {
 754                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 755                 }
 756                 else
 757                 {
 758                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 759                 }
 760
 761                 /* Up to here the process is the same for X.509 certificates and
 762                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 763                  * be easily extended to work with openpgp keys as well.
 764                  */
 765                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 766                 {
 767                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 768                         return;
 769                 }
 770
 771                 ret = gnutls_x509_crt_init(&cert);
 772                 if (ret < 0)
 773                 {
 774                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 775                         return;
 776                 }
 777
 778                 cert_list_size = 0;
 779                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 780                 if (cert_list == NULL)
 781                 {
 782                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 783                         return;
 784                 }
 785
 786                 /* This is not a real world example, since we only check the first
 787                  * certificate in the given chain.
 788                  */
 789
 790                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 791                 if (ret < 0)
 792                 {
 793                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 794                         return;
 795                 }
 796
 797                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 798
 799                 certinfo->data.insert(std::make_pair("dn",name));
 800
 801                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 802
 803                 certinfo->data.insert(std::make_pair("issuer",name));
 804
 805                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 806                 {
 807                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 808                 }
 809                 else
 810                 {
 811                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 812                 }
 813
 814                 /* Beware here we do not check for errors.
 815                  */
 816                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 817                 {
 818                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 819                 }
 820
 821                 gnutls_x509_crt_deinit(cert);
 822
 823                 return;
 824         }
 825
 826 };
 827
 828 class ModuleSSLGnuTLSFactory : public ModuleFactory
 829 {
 830  public:
 831         ModuleSSLGnuTLSFactory()
 832         {
 833         }
 834
 835         ~ModuleSSLGnuTLSFactory()
 836         {
 837         }
 838
 839         virtual Module * CreateModule(InspIRCd* Me)
 840         {
 841                 return new ModuleSSLGnuTLS(Me);
 842         }
 843 };
 844
 845
 846 extern "C" DllExport void * init_module( void )
 847 {
 848         return new ModuleSSLGnuTLSFactory;
 849 }