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