src/modules/extra/m_ssl_gnutls.cpp

   1 #include <string>
   2 #include <vector>
   3
   4 #include <gnutls/gnutls.h>
   5 #include <gnutls/x509.h>
   6
   7 #include "inspircd_config.h"
   8 #include "configreader.h"
   9 #include "users.h"
  10 #include "channels.h"
  11 #include "modules.h"
  12
  13 #include "socket.h"
  14 #include "hashcomp.h"
  15 #include "inspircd.h"
  16
  17 #include "ssl_cert.h"
  18
  19 /* $ModDesc: Provides SSL support for clients */
  20 /* $CompileFlags: `libgnutls-config --cflags` */
  21 /* $LinkerFlags: `libgnutls-config --libs` `perl ../gnutls_rpath.pl` */
  22
  23
  24
  25 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  26
  27 bool isin(int port, const std::vector<int> &portlist)
  28 {
  29         for(unsigned int i = 0; i < portlist.size(); i++)
  30                 if(portlist[i] == port)
  31                         return true;
  32
  33         return false;
  34 }
  35
  36 /** Represents an SSL user's extra data
  37  */
  38 class issl_session : public classbase
  39 {
  40 public:
  41         gnutls_session_t sess;
  42         issl_status status;
  43         std::string outbuf;
  44         int inbufoffset;
  45         char* inbuf;
  46         int fd;
  47 };
  48
  49 class ModuleSSLGnuTLS : public Module
  50 {
  51
  52         ConfigReader* Conf;
  53
  54         char* dummy;
  55
  56         CullList* culllist;
  57
  58         std::vector<int> listenports;
  59
  60         int inbufsize;
  61         issl_session sessions[MAX_DESCRIPTORS];
  62
  63         gnutls_certificate_credentials x509_cred;
  64         gnutls_dh_params dh_params;
  65
  66         std::string keyfile;
  67         std::string certfile;
  68         std::string cafile;
  69         std::string crlfile;
  70         int dh_bits;
  71
  72  public:
  73
  74         ModuleSSLGnuTLS(InspIRCd* Me)
  75                 : Module::Module(Me)
  76         {
  77
  78
  79                 culllist = new CullList(ServerInstance);
  80
  81                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
  82                 inbufsize = ServerInstance->Config->NetBufferSize;
  83
  84                 gnutls_global_init(); // This must be called once in the program
  85
  86                 if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
  87                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
  88
  89                 // Guessing return meaning
  90                 if(gnutls_dh_params_init(&dh_params) < 0)
  91                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters");
  92
  93                 // Needs the flag as it ignores a plain /rehash
  94                 OnRehash("ssl");
  95
  96                 // Void return, guess we assume success
  97                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
  98         }
  99
 100         virtual void OnRehash(const std::string &param)
 101         {
 102                 if(param != "ssl")
 103                         return;
 104
 105                 Conf = new ConfigReader(ServerInstance);
 106
 107                 for(unsigned int i = 0; i < listenports.size(); i++)
 108                 {
 109                         ServerInstance->Config->DelIOHook(listenports[i]);
 110                 }
 111
 112                 listenports.clear();
 113
 114                 for(int i = 0; i < Conf->Enumerate("bind"); i++)
 115                 {
 116                         // For each <bind> tag
 117                         if(((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "gnutls"))
 118                         {
 119                                 // Get the port we're meant to be listening on with SSL
 120                                 std::string port = Conf->ReadValue("bind", "port", i);
 121                                 irc::portparser portrange(port);
 122                                 long portno = -1;
 123                                 while ((portno = portrange.GetToken()))
 124                                 {
 125                                         if (ServerInstance->Config->AddIOHook(portno, this))
 126                                         {
 127                                                 listenports.push_back(portno);
 128                                                 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portno);
 129                                         }
 130                                         else
 131                                         {
 132                                                 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 133                                         }
 134                                 }
 135                         }
 136                 }
 137
 138                 std::string confdir(CONFIG_FILE);
 139                 // +1 so we the path ends with a /
 140                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 141
 142                 cafile  = Conf->ReadValue("gnutls", "cafile", 0);
 143                 crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
 144                 certfile        = Conf->ReadValue("gnutls", "certfile", 0);
 145                 keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
 146                 dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
 147
 148                 // Set all the default values needed.
 149                 if(cafile == "")
 150                         cafile = "ca.pem";
 151
 152                 if(crlfile == "")
 153                         crlfile = "crl.pem";
 154
 155                 if(certfile == "")
 156                         certfile = "cert.pem";
 157
 158                 if(keyfile == "")
 159                         keyfile = "key.pem";
 160
 161                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 162                         dh_bits = 1024;
 163
 164                 // Prepend relative paths with the path to the config directory.
 165                 if(cafile[0] != '/')
 166                         cafile = confdir + cafile;
 167
 168                 if(crlfile[0] != '/')
 169                         crlfile = confdir + crlfile;
 170
 171                 if(certfile[0] != '/')
 172                         certfile = confdir + certfile;
 173
 174                 if(keyfile[0] != '/')
 175                         keyfile = confdir + keyfile;
 176
 177                 if(gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 178                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 trust file: %s", cafile.c_str());
 179
 180                 if(gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 181                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 CRL file: %s", crlfile.c_str());
 182
 183                 // Guessing on the return value of this, manual doesn't say :|
 184                 if(gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 185                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 certificate and key files: %s and %s", certfile.c_str(), keyfile.c_str());
 186
 187                 // This may be on a large (once a day or week) timer eventually.
 188                 GenerateDHParams();
 189
 190                 DELETE(Conf);
 191         }
 192
 193         void GenerateDHParams()
 194         {
 195                 // Generate Diffie Hellman parameters - for use with DHE
 196                 // kx algorithms. These should be discarded and regenerated
 197                 // once a day, once a week or once a month. Depending on the
 198                 // security requirements.
 199
 200                 if(gnutls_dh_params_generate2(dh_params, dh_bits) < 0)
 201                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits)", dh_bits);
 202         }
 203
 204         virtual ~ModuleSSLGnuTLS()
 205         {
 206                 gnutls_dh_params_deinit(dh_params);
 207                 gnutls_certificate_free_credentials(x509_cred);
 208                 gnutls_global_deinit();
 209                 delete culllist;
 210         }
 211
 212         virtual void OnCleanup(int target_type, void* item)
 213         {
 214                 if(target_type == TYPE_USER)
 215                 {
 216                         userrec* user = (userrec*)item;
 217
 218                         if(user->GetExt("ssl", dummy) && isin(user->GetPort(), listenports))
 219                         {
 220                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 221                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 222                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Adding user %s to cull list", user->nick);
 223                                 culllist->AddItem(user, "SSL module unloading");
 224                         }
 225                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 226                         {
 227                                 ssl_cert* tofree;
 228                                 user->GetExt("ssl_cert", tofree);
 229                                 delete tofree;
 230                                 user->Shrink("ssl_cert");
 231                         }
 232                 }
 233         }
 234
 235         virtual void OnUnloadModule(Module* mod, const std::string &name)
 236         {
 237                 if(mod == this)
 238                 {
 239                         // We're being unloaded, kill all the users added to the cull list in OnCleanup
 240                         int numusers = culllist->Apply();
 241                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Killed %d users for unload of GnuTLS SSL module", numusers);
 242
 243                         for(unsigned int i = 0; i < listenports.size(); i++)
 244                                 ServerInstance->Config->DelIOHook(listenports[i]);
 245                 }
 246         }
 247
 248         virtual Version GetVersion()
 249         {
 250                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 251         }
 252
 253         void Implements(char* List)
 254         {
 255                 List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 256                 List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 257         }
 258
 259         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 260         {
 261                 issl_session* session = &sessions[fd];
 262
 263                 session->fd = fd;
 264                 session->inbuf = new char[inbufsize];
 265                 session->inbufoffset = 0;
 266
 267                 gnutls_init(&session->sess, GNUTLS_SERVER);
 268
 269                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 270                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 271                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 272                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 273
 274                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 275                  * This needs testing, but it's easy enough to rollback if need be
 276                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 277                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 278                  *
 279                  * With testing this seems to...not work :/
 280                  */
 281
 282                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 283
 284                 Handshake(session);
 285         }
 286
 287         virtual void OnRawSocketClose(int fd)
 288         {
 289                 ServerInstance->Log(DEBUG, "OnRawSocketClose: %d", fd);
 290                 CloseSession(&sessions[fd]);
 291
 292                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 293
 294                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 295                 {
 296                         ssl_cert* tofree;
 297                         user->GetExt("ssl_cert", tofree);
 298                         delete tofree;
 299                         user->Shrink("ssl_cert");
 300                 }
 301         }
 302
 303         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 304         {
 305                 issl_session* session = &sessions[fd];
 306
 307                 if (!session->sess)
 308                 {
 309                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: No session to read from");
 310                         readresult = 0;
 311                         CloseSession(session);
 312                         return 1;
 313                 }
 314
 315                 if (session->status == ISSL_HANDSHAKING_READ)
 316                 {
 317                         // The handshake isn't finished, try to finish it.
 318
 319                         if(Handshake(session))
 320                         {
 321                                 // Handshake successfully resumed.
 322                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: successfully resumed handshake");
 323                         }
 324                         else
 325                         {
 326                                 // Couldn't resume handshake.
 327                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: failed to resume handshake");
 328                                 return -1;
 329                         }
 330                 }
 331                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 332                 {
 333                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
 334                         return -1;
 335                 }
 336
 337                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 338
 339                 if (session->status == ISSL_HANDSHAKEN)
 340                 {
 341                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 342                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 343                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: gnutls_record_recv(sess, inbuf+%d, %d-%d)", session->inbufoffset, inbufsize, session->inbufoffset);
 344
 345                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 346
 347                         if (ret == 0)
 348                         {
 349                                 // Client closed connection.
 350                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Client closed the connection");
 351                                 readresult = 0;
 352                                 CloseSession(session);
 353                                 return 1;
 354                         }
 355                         else if (ret < 0)
 356                         {
 357                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 358                                 {
 359                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Not all SSL data read: %s", gnutls_strerror(ret));
 360                                         return -1;
 361                                 }
 362                                 else
 363                                 {
 364                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Error reading SSL data: %s", gnutls_strerror(ret));
 365                                         readresult = 0;
 366                                         CloseSession(session);
 367                                 }
 368                         }
 369                         else
 370                         {
 371                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 372                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 373                                 // 'buffer' is 'count' long
 374
 375                                 unsigned int length = ret + session->inbufoffset;
 376
 377                                 if(count <= length)
 378                                 {
 379                                         memcpy(buffer, session->inbuf, count);
 380                                         // Move the stuff left in inbuf to the beginning of it
 381                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 382                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 383                                         session->inbufoffset = length - count;
 384                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 385                                         readresult = count;
 386                                 }
 387                                 else
 388                                 {
 389                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 390                                         memcpy(buffer, session->inbuf, length);
 391                                         // Zero the offset, as there's nothing there..
 392                                         session->inbufoffset = 0;
 393                                         // As above
 394                                         readresult = length;
 395                                 }
 396                         }
 397                 }
 398                 else if(session->status == ISSL_CLOSING)
 399                 {
 400                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: session closing...");
 401                         readresult = 0;
 402                 }
 403
 404                 return 1;
 405         }
 406
 407         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 408         {
 409                 issl_session* session = &sessions[fd];
 410                 const char* sendbuffer = buffer;
 411
 412                 if(!session->sess)
 413                 {
 414                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: No session to write to");
 415                         CloseSession(session);
 416                         return 1;
 417                 }
 418
 419                 if(session->status == ISSL_HANDSHAKING_WRITE)
 420                 {
 421                         // The handshake isn't finished, try to finish it.
 422
 423                         if(Handshake(session))
 424                         {
 425                                 // Handshake successfully resumed.
 426                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: successfully resumed handshake");
 427                         }
 428                         else
 429                         {
 430                                 // Couldn't resume handshake.
 431                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: failed to resume handshake");
 432                         }
 433                 }
 434                 else if(session->status == ISSL_HANDSHAKING_READ)
 435                 {
 436                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");
 437                 }
 438
 439                 session->outbuf.append(sendbuffer, count);
 440                 sendbuffer = session->outbuf.c_str();
 441                 count = session->outbuf.size();
 442
 443                 if(session->status == ISSL_HANDSHAKEN)
 444                 {
 445                         int ret = gnutls_record_send(session->sess, sendbuffer, count);
 446
 447                         if(ret == 0)
 448                         {
 449                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Client closed the connection");
 450                                 CloseSession(session);
 451                         }
 452                         else if(ret < 0)
 453                         {
 454                                 if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 455                                 {
 456                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Not all SSL data written: %s", gnutls_strerror(ret));
 457                                 }
 458                                 else
 459                                 {
 460                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Error writing SSL data: %s", gnutls_strerror(ret));
 461                                         CloseSession(session);
 462                                 }
 463                         }
 464                         else
 465                         {
 466                                 session->outbuf = session->outbuf.substr(ret);
 467                         }
 468                 }
 469                 else if(session->status == ISSL_CLOSING)
 470                 {
 471                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: session closing...");
 472                 }
 473
 474                 return 1;
 475         }
 476
 477         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 478         virtual void OnWhois(userrec* source, userrec* dest)
 479         {
 480                 // Bugfix, only send this numeric for *our* SSL users
 481                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 482                 {
 483                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 484                 }
 485         }
 486
 487         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 488         {
 489                 // check if the linking module wants to know about OUR metadata
 490                 if(extname == "ssl")
 491                 {
 492                         // check if this user has an swhois field to send
 493                         if(user->GetExt(extname, dummy))
 494                         {
 495                                 // call this function in the linking module, let it format the data how it
 496                                 // sees fit, and send it on its way. We dont need or want to know how.
 497                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 498                         }
 499                 }
 500         }
 501
 502         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 503         {
 504                 // check if its our metadata key, and its associated with a user
 505                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 506                 {
 507                         userrec* dest = (userrec*)target;
 508                         // if they dont already have an ssl flag, accept the remote server's
 509                         if (!dest->GetExt(extname, dummy))
 510                         {
 511                                 dest->Extend(extname, "ON");
 512                         }
 513                 }
 514         }
 515
 516         bool Handshake(issl_session* session)
 517         {
 518                 int ret = gnutls_handshake(session->sess);
 519
 520                 if(ret < 0)
 521                 {
 522                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 523                         {
 524                                 // Handshake needs resuming later, read() or write() would have blocked.
 525
 526                                 if(gnutls_record_get_direction(session->sess) == 0)
 527                                 {
 528                                         // gnutls_handshake() wants to read() again.
 529                                         session->status = ISSL_HANDSHAKING_READ;
 530                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (reading) later, error string: %s", gnutls_strerror(ret));
 531                                 }
 532                                 else
 533                                 {
 534                                         // gnutls_handshake() wants to write() again.
 535                                         session->status = ISSL_HANDSHAKING_WRITE;
 536                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (writing) later, error string: %s", gnutls_strerror(ret));
 537                                         MakePollWrite(session);
 538                                 }
 539                         }
 540                         else
 541                         {
 542                                 // Handshake failed.
 543                                 CloseSession(session);
 544                            ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake failed, error string: %s", gnutls_strerror(ret));
 545                            session->status = ISSL_CLOSING;
 546                         }
 547
 548                         return false;
 549                 }
 550                 else
 551                 {
 552                         // Handshake complete.
 553                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake completed");
 554
 555                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 556                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 557                         if (extendme)
 558                         {
 559                                 if (!extendme->GetExt("ssl", dummy))
 560                                         extendme->Extend("ssl", "ON");
 561                         }
 562
 563                         // Change the seesion state
 564                         session->status = ISSL_HANDSHAKEN;
 565
 566                         // Finish writing, if any left
 567                         MakePollWrite(session);
 568
 569                         return true;
 570                 }
 571         }
 572
 573         virtual void OnPostConnect(userrec* user)
 574         {
 575                 // This occurs AFTER OnUserConnect so we can be sure the
 576                 // protocol module has propogated the NICK message.
 577                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 578                 {
 579                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 580                         std::deque<std::string>* metadata = new std::deque<std::string>;
 581                         metadata->push_back(user->nick);
 582                         metadata->push_back("ssl");             // The metadata id
 583                         metadata->push_back("ON");              // The value to send
 584                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 585                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 586                         DELETE(event);
 587                         DELETE(metadata);
 588
 589                         VerifyCertificate(&sessions[user->GetFd()],user);
 590                 }
 591         }
 592
 593         void MakePollWrite(issl_session* session)
 594         {
 595                 OnRawSocketWrite(session->fd, NULL, 0);
 596         }
 597
 598         void CloseSession(issl_session* session)
 599         {
 600                 if(session->sess)
 601                 {
 602                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 603                         gnutls_deinit(session->sess);
 604                 }
 605
 606                 if(session->inbuf)
 607                 {
 608                         delete[] session->inbuf;
 609                 }
 610
 611                 session->outbuf.clear();
 612                 session->inbuf = NULL;
 613                 session->sess = NULL;
 614                 session->status = ISSL_NONE;
 615         }
 616
 617         void VerifyCertificate(issl_session* session, userrec* user)
 618         {
 619                 unsigned int status;
 620                 const gnutls_datum_t* cert_list;
 621                 int ret;
 622                 unsigned int cert_list_size;
 623                 gnutls_x509_crt_t cert;
 624                 char name[MAXBUF];
 625                 unsigned char digest[MAXBUF];
 626                 size_t digest_size = sizeof(digest);
 627                 size_t name_size = sizeof(name);
 628                 ssl_cert* certinfo = new ssl_cert;
 629
 630                 user->Extend("ssl_cert",certinfo);
 631
 632                 /* This verification function uses the trusted CAs in the credentials
 633                  * structure. So you must have installed one or more CA certificates.
 634                  */
 635                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 636
 637                 if (ret < 0)
 638                 {
 639                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 640                         return;
 641                 }
 642
 643                 if (status & GNUTLS_CERT_INVALID)
 644                 {
 645                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 646                 }
 647                 else
 648                 {
 649                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 650                 }
 651                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 652                 {
 653                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 654                 }
 655                 else
 656                 {
 657                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 658                 }
 659                 if (status & GNUTLS_CERT_REVOKED)
 660                 {
 661                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 662                 }
 663                 else
 664                 {
 665                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 666                 }
 667                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 668                 {
 669                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 670                 }
 671                 else
 672                 {
 673                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 674                 }
 675
 676                 /* Up to here the process is the same for X.509 certificates and
 677                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 678                  * be easily extended to work with openpgp keys as well.
 679                  */
 680                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 681                 {
 682                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 683                         return;
 684                 }
 685
 686                 ret = gnutls_x509_crt_init(&cert);
 687                 if (ret < 0)
 688                 {
 689                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 690                         return;
 691                 }
 692
 693                 cert_list_size = 0;
 694                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 695                 if (cert_list == NULL)
 696                 {
 697                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 698                         return;
 699                 }
 700
 701                 /* This is not a real world example, since we only check the first
 702                  * certificate in the given chain.
 703                  */
 704
 705                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 706                 if (ret < 0)
 707                 {
 708                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 709                         return;
 710                 }
 711
 712                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 713
 714                 certinfo->data.insert(std::make_pair("dn",name));
 715
 716                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 717
 718                 certinfo->data.insert(std::make_pair("issuer",name));
 719
 720                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 721                 {
 722                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 723                 }
 724                 else
 725                 {
 726                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 727                         user->WriteServ("NOTICE %s :*** Your SSL Certificate fingerprint is: %s", user->nick, irc::hex(digest, digest_size).c_str());
 728                 }
 729
 730                 /* Beware here we do not check for errors.
 731                  */
 732                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 733                 {
 734                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 735                 }
 736
 737                 gnutls_x509_crt_deinit(cert);
 738
 739                 return;
 740         }
 741
 742 };
 743
 744 class ModuleSSLGnuTLSFactory : public ModuleFactory
 745 {
 746  public:
 747         ModuleSSLGnuTLSFactory()
 748         {
 749         }
 750
 751         ~ModuleSSLGnuTLSFactory()
 752         {
 753         }
 754
 755         virtual Module * CreateModule(InspIRCd* Me)
 756         {
 757                 return new ModuleSSLGnuTLS(Me);
 758         }
 759 };
 760
 761
 762 extern "C" void * init_module( void )
 763 {
 764         return new ModuleSSLGnuTLSFactory;
 765 }