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