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.h"
  18
  19 /* $ModDesc: Provides SSL support for clients */
  20 /* $CompileFlags: `libgnutls-config --cflags` */
  21 /* $LinkerFlags: `perl extra/gnutls_rpath.pl` */
  22 /* $ModDep: ssl.h */
  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, false);
 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_OnRawSocketConnect] = 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 OnRawSocketConnect(int fd)
 288         {
 289                 issl_session* session = &sessions[fd];
 290
 291                 session->fd = fd;
 292                 session->inbuf = new char[inbufsize];
 293                 session->inbufoffset = 0;
 294
 295                 gnutls_init(&session->sess, GNUTLS_SERVER);
 296
 297                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 298                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 299                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 300
 301                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 302
 303                 Handshake(session);
 304         }
 305
 306         virtual void OnRawSocketClose(int fd)
 307         {
 308                 ServerInstance->Log(DEBUG, "OnRawSocketClose: %d", fd);
 309                 CloseSession(&sessions[fd]);
 310
 311                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 312
 313                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 314                 {
 315                         ssl_cert* tofree;
 316                         user->GetExt("ssl_cert", tofree);
 317                         delete tofree;
 318                         user->Shrink("ssl_cert");
 319                 }
 320         }
 321
 322         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 323         {
 324                 issl_session* session = &sessions[fd];
 325
 326                 if (!session->sess)
 327                 {
 328                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: No session to read from");
 329                         readresult = 0;
 330                         CloseSession(session);
 331                         return 1;
 332                 }
 333
 334                 if (session->status == ISSL_HANDSHAKING_READ)
 335                 {
 336                         // The handshake isn't finished, try to finish it.
 337
 338                         if(Handshake(session))
 339                         {
 340                                 // Handshake successfully resumed.
 341                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: successfully resumed handshake");
 342                         }
 343                         else
 344                         {
 345                                 // Couldn't resume handshake.
 346                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: failed to resume handshake");
 347                                 return -1;
 348                         }
 349                 }
 350                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 351                 {
 352                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
 353                         return -1;
 354                 }
 355
 356                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 357
 358                 if (session->status == ISSL_HANDSHAKEN)
 359                 {
 360                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 361                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 362                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: gnutls_record_recv(sess, inbuf+%d, %d-%d)", session->inbufoffset, inbufsize, session->inbufoffset);
 363
 364                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 365
 366                         if (ret == 0)
 367                         {
 368                                 // Client closed connection.
 369                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Client closed the connection");
 370                                 readresult = 0;
 371                                 CloseSession(session);
 372                                 return 1;
 373                         }
 374                         else if (ret < 0)
 375                         {
 376                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 377                                 {
 378                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Not all SSL data read: %s", gnutls_strerror(ret));
 379                                         return -1;
 380                                 }
 381                                 else
 382                                 {
 383                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Error reading SSL data: %s", gnutls_strerror(ret));
 384                                         readresult = 0;
 385                                         CloseSession(session);
 386                                 }
 387                         }
 388                         else
 389                         {
 390                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 391                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 392                                 // 'buffer' is 'count' long
 393
 394                                 unsigned int length = ret + session->inbufoffset;
 395
 396                                 if(count <= length)
 397                                 {
 398                                         memcpy(buffer, session->inbuf, count);
 399                                         // Move the stuff left in inbuf to the beginning of it
 400                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 401                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 402                                         session->inbufoffset = length - count;
 403                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 404                                         readresult = count;
 405                                 }
 406                                 else
 407                                 {
 408                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 409                                         memcpy(buffer, session->inbuf, length);
 410                                         // Zero the offset, as there's nothing there..
 411                                         session->inbufoffset = 0;
 412                                         // As above
 413                                         readresult = length;
 414                                 }
 415                         }
 416                 }
 417                 else if(session->status == ISSL_CLOSING)
 418                 {
 419                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: session closing...");
 420                         readresult = 0;
 421                 }
 422
 423                 return 1;
 424         }
 425
 426         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 427         {
 428                 issl_session* session = &sessions[fd];
 429                 const char* sendbuffer = buffer;
 430
 431                 if(!session->sess)
 432                 {
 433                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: No session to write to");
 434                         CloseSession(session);
 435                         return 1;
 436                 }
 437
 438                 if(session->status == ISSL_HANDSHAKING_WRITE)
 439                 {
 440                         // The handshake isn't finished, try to finish it.
 441
 442                         if(Handshake(session))
 443                         {
 444                                 // Handshake successfully resumed.
 445                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: successfully resumed handshake");
 446                         }
 447                         else
 448                         {
 449                                 // Couldn't resume handshake.
 450                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: failed to resume handshake");
 451                         }
 452                 }
 453                 else if(session->status == ISSL_HANDSHAKING_READ)
 454                 {
 455                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");
 456                 }
 457
 458                 session->outbuf.append(sendbuffer, count);
 459                 sendbuffer = session->outbuf.c_str();
 460                 count = session->outbuf.size();
 461
 462                 if(session->status == ISSL_HANDSHAKEN)
 463                 {
 464                         int ret = gnutls_record_send(session->sess, sendbuffer, count);
 465
 466                         if(ret == 0)
 467                         {
 468                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Client closed the connection");
 469                                 CloseSession(session);
 470                         }
 471                         else if(ret < 0)
 472                         {
 473                                 if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 474                                 {
 475                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Not all SSL data written: %s", gnutls_strerror(ret));
 476                                 }
 477                                 else
 478                                 {
 479                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Error writing SSL data: %s", gnutls_strerror(ret));
 480                                         CloseSession(session);
 481                                 }
 482                         }
 483                         else
 484                         {
 485                                 session->outbuf = session->outbuf.substr(ret);
 486                         }
 487                 }
 488                 else if(session->status == ISSL_CLOSING)
 489                 {
 490                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: session closing...");
 491                 }
 492
 493                 return 1;
 494         }
 495
 496         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 497         virtual void OnWhois(userrec* source, userrec* dest)
 498         {
 499                 // Bugfix, only send this numeric for *our* SSL users
 500                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 501                 {
 502                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 503                 }
 504         }
 505
 506         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 507         {
 508                 // check if the linking module wants to know about OUR metadata
 509                 if(extname == "ssl")
 510                 {
 511                         // check if this user has an swhois field to send
 512                         if(user->GetExt(extname, dummy))
 513                         {
 514                                 // call this function in the linking module, let it format the data how it
 515                                 // sees fit, and send it on its way. We dont need or want to know how.
 516                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 517                         }
 518                 }
 519         }
 520
 521         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 522         {
 523                 // check if its our metadata key, and its associated with a user
 524                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 525                 {
 526                         userrec* dest = (userrec*)target;
 527                         // if they dont already have an ssl flag, accept the remote server's
 528                         if (!dest->GetExt(extname, dummy))
 529                         {
 530                                 dest->Extend(extname, "ON");
 531                         }
 532                 }
 533         }
 534
 535         bool Handshake(issl_session* session)
 536         {
 537                 int ret = gnutls_handshake(session->sess);
 538
 539                 if(ret < 0)
 540                 {
 541                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 542                         {
 543                                 // Handshake needs resuming later, read() or write() would have blocked.
 544
 545                                 if(gnutls_record_get_direction(session->sess) == 0)
 546                                 {
 547                                         // gnutls_handshake() wants to read() again.
 548                                         session->status = ISSL_HANDSHAKING_READ;
 549                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (reading) later, error string: %s", gnutls_strerror(ret));
 550                                 }
 551                                 else
 552                                 {
 553                                         // gnutls_handshake() wants to write() again.
 554                                         session->status = ISSL_HANDSHAKING_WRITE;
 555                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (writing) later, error string: %s", gnutls_strerror(ret));
 556                                         MakePollWrite(session);
 557                                 }
 558                         }
 559                         else
 560                         {
 561                                 // Handshake failed.
 562                                 CloseSession(session);
 563                            ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake failed, error string: %s", gnutls_strerror(ret));
 564                            session->status = ISSL_CLOSING;
 565                         }
 566
 567                         return false;
 568                 }
 569                 else
 570                 {
 571                         // Handshake complete.
 572                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake completed");
 573
 574                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 575                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 576                         if (extendme)
 577                         {
 578                                 if (!extendme->GetExt("ssl", dummy))
 579                                         extendme->Extend("ssl", "ON");
 580                         }
 581
 582                         // Change the seesion state
 583                         session->status = ISSL_HANDSHAKEN;
 584
 585                         // Finish writing, if any left
 586                         MakePollWrite(session);
 587
 588                         return true;
 589                 }
 590         }
 591
 592         virtual void OnPostConnect(userrec* user)
 593         {
 594                 // This occurs AFTER OnUserConnect so we can be sure the
 595                 // protocol module has propogated the NICK message.
 596                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 597                 {
 598                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 599                         std::deque<std::string>* metadata = new std::deque<std::string>;
 600                         metadata->push_back(user->nick);
 601                         metadata->push_back("ssl");             // The metadata id
 602                         metadata->push_back("ON");              // The value to send
 603                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 604                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 605                         DELETE(event);
 606                         DELETE(metadata);
 607
 608                         VerifyCertificate(&sessions[user->GetFd()],user);
 609                 }
 610         }
 611
 612         void MakePollWrite(issl_session* session)
 613         {
 614                 OnRawSocketWrite(session->fd, NULL, 0);
 615         }
 616
 617         void CloseSession(issl_session* session)
 618         {
 619                 if(session->sess)
 620                 {
 621                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 622                         gnutls_deinit(session->sess);
 623                 }
 624
 625                 if(session->inbuf)
 626                 {
 627                         delete[] session->inbuf;
 628                 }
 629
 630                 session->outbuf.clear();
 631                 session->inbuf = NULL;
 632                 session->sess = NULL;
 633                 session->status = ISSL_NONE;
 634         }
 635
 636         void VerifyCertificate(issl_session* session, userrec* user)
 637         {
 638                 unsigned int status;
 639                 const gnutls_datum_t* cert_list;
 640                 int ret;
 641                 unsigned int cert_list_size;
 642                 gnutls_x509_crt_t cert;
 643                 char name[MAXBUF];
 644                 unsigned char digest[MAXBUF];
 645                 size_t digest_size = sizeof(digest);
 646                 size_t name_size = sizeof(name);
 647                 ssl_cert* certinfo = new ssl_cert;
 648
 649                 user->Extend("ssl_cert",certinfo);
 650
 651                 /* This verification function uses the trusted CAs in the credentials
 652                  * structure. So you must have installed one or more CA certificates.
 653                  */
 654                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 655
 656                 if (ret < 0)
 657                 {
 658                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 659                         return;
 660                 }
 661
 662                 if (status & GNUTLS_CERT_INVALID)
 663                 {
 664                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 665                 }
 666                 else
 667                 {
 668                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 669                 }
 670                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 671                 {
 672                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 673                 }
 674                 else
 675                 {
 676                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 677                 }
 678                 if (status & GNUTLS_CERT_REVOKED)
 679                 {
 680                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 681                 }
 682                 else
 683                 {
 684                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 685                 }
 686                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 687                 {
 688                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 689                 }
 690                 else
 691                 {
 692                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 693                 }
 694
 695                 /* Up to here the process is the same for X.509 certificates and
 696                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 697                  * be easily extended to work with openpgp keys as well.
 698                  */
 699                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 700                 {
 701                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 702                         return;
 703                 }
 704
 705                 ret = gnutls_x509_crt_init(&cert);
 706                 if (ret < 0)
 707                 {
 708                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 709                         return;
 710                 }
 711
 712                 cert_list_size = 0;
 713                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 714                 if (cert_list == NULL)
 715                 {
 716                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 717                         return;
 718                 }
 719
 720                 /* This is not a real world example, since we only check the first
 721                  * certificate in the given chain.
 722                  */
 723
 724                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 725                 if (ret < 0)
 726                 {
 727                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 728                         return;
 729                 }
 730
 731                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 732
 733                 certinfo->data.insert(std::make_pair("dn",name));
 734
 735                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 736
 737                 certinfo->data.insert(std::make_pair("issuer",name));
 738
 739                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 740                 {
 741                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 742                 }
 743                 else
 744                 {
 745                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 746                         user->WriteServ("NOTICE %s :*** Your SSL Certificate fingerprint is: %s", user->nick, irc::hex(digest, digest_size).c_str());
 747                 }
 748
 749                 /* Beware here we do not check for errors.
 750                  */
 751                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 752                 {
 753                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 754                 }
 755
 756                 gnutls_x509_crt_deinit(cert);
 757
 758                 return;
 759         }
 760
 761 };
 762
 763 class ModuleSSLGnuTLSFactory : public ModuleFactory
 764 {
 765  public:
 766         ModuleSSLGnuTLSFactory()
 767         {
 768         }
 769
 770         ~ModuleSSLGnuTLSFactory()
 771         {
 772         }
 773
 774         virtual Module * CreateModule(InspIRCd* Me)
 775         {
 776                 return new ModuleSSLGnuTLS(Me);
 777         }
 778 };
 779
 780
 781 extern "C" void * init_module( void )
 782 {
 783         return new ModuleSSLGnuTLSFactory;
 784 }