src/modules/extra/m_ssl_gnutls.cpp

   1 #include <string>
   2 #include <vector>
   3
   4 #include <gnutls/gnutls.h>
   5 #include <gnutls/x509.h>
   6
   7 #include "inspircd_config.h"
   8 #include "configreader.h"
   9 #include "users.h"
  10 #include "channels.h"
  11 #include "modules.h"
  12
  13 #include "socket.h"
  14 #include "hashcomp.h"
  15 #include "inspircd.h"
  16
  17 #include "ssl_cert.h"
  18
  19 /* $ModDesc: Provides SSL support for clients */
  20 /* $CompileFlags: `libgnutls-config --cflags` */
  21 /* $LinkerFlags: `libgnutls-config --libs` `perl ../gnutls_rpath.pl` */
  22
  23
  24
  25 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  26
  27 bool isin(int port, const std::vector<int> &portlist)
  28 {
  29         for(unsigned int i = 0; i < portlist.size(); i++)
  30                 if(portlist[i] == port)
  31                         return true;
  32
  33         return false;
  34 }
  35
  36 /** Represents an SSL user's extra data
  37  */
  38 class issl_session : public classbase
  39 {
  40 public:
  41         gnutls_session_t sess;
  42         issl_status status;
  43         std::string outbuf;
  44         int inbufoffset;
  45         char* inbuf;
  46         int fd;
  47 };
  48
  49 class ModuleSSLGnuTLS : public Module
  50 {
  51
  52         ConfigReader* Conf;
  53
  54         char* dummy;
  55
  56         CullList* culllist;
  57
  58         std::vector<int> listenports;
  59
  60         int inbufsize;
  61         issl_session sessions[MAX_DESCRIPTORS];
  62
  63         gnutls_certificate_credentials x509_cred;
  64         gnutls_dh_params dh_params;
  65
  66         std::string keyfile;
  67         std::string certfile;
  68         std::string cafile;
  69         std::string crlfile;
  70         int dh_bits;
  71
  72  public:
  73
  74         ModuleSSLGnuTLS(InspIRCd* Me)
  75                 : Module::Module(Me)
  76         {
  77
  78
  79                 culllist = new CullList(ServerInstance);
  80
  81                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
  82                 inbufsize = ServerInstance->Config->NetBufferSize;
  83
  84                 gnutls_global_init(); // This must be called once in the program
  85
  86                 if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
  87                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
  88
  89                 // Guessing return meaning
  90                 if(gnutls_dh_params_init(&dh_params) < 0)
  91                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters");
  92
  93                 // Needs the flag as it ignores a plain /rehash
  94                 OnRehash("ssl");
  95
  96                 // Void return, guess we assume success
  97                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
  98         }
  99
 100         virtual void OnRehash(const std::string &param)
 101         {
 102                 if(param != "ssl")
 103                         return;
 104
 105                 Conf = new ConfigReader(ServerInstance);
 106
 107                 for(unsigned int i = 0; i < listenports.size(); i++)
 108                 {
 109                         ServerInstance->Config->DelIOHook(listenports[i]);
 110                 }
 111
 112                 listenports.clear();
 113
 114                 for(int i = 0; i < Conf->Enumerate("bind"); i++)
 115                 {
 116                         // For each <bind> tag
 117                         if(((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "gnutls"))
 118                         {
 119                                 // Get the port we're meant to be listening on with SSL
 120                                 std::string port = Conf->ReadValue("bind", "port", i);
 121                                 irc::commasepstream portrange(port);
 122                                 std::string portno = "*";
 123                                 while ((portno = portrange.GetToken()) != "")
 124                                 {
 125                                         std::string::size_type dash = portno.rfind('-');
 126                                         if (dash != std::string::npos)
 127                                         {
 128                                                 std::string sbegin = portno.substr(0, dash);
 129                                                 std::string send = portno.substr(dash+1, portno.length());
 130                                                 long begin = atoi(sbegin.c_str());
 131                                                 long end = atoi(send.c_str());
 132                                                 if ((begin < 0) || (end < 0) || (begin > 65535) || (end > 65535) || (begin >= end))
 133                                                 {
 134                                                         ServerInstance->Log(DEFAULT,"WARNING: Port range \"%d-%d\" discarded. begin >= end, or begin/end out of range.", begin, end);
 135                                                 }
 136                                                 else
 137                                                 {
 138                                                         for (int portval = begin; portval <= end; ++portval)
 139                                                         {
 140                                                                 if (ServerInstance->Config->AddIOHook(portval, this))
 141                                                                 {
 142                                                                         listenports.push_back(portval);
 143                                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portval);
 144                                                                 }
 145                                                                 else
 146                                                                 {
 147                                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?",
 148                                                                                         portval);
 149                                                                 }
 150                                                         }
 151                                                 }
 152                                         }
 153                                         else
 154                                         {
 155                                                 if (ServerInstance->Config->AddIOHook(atoi(portno.c_str()), this))
 156                                                 {
 157                                                         // We keep a record of which ports we're listening on with SSL
 158                                                         listenports.push_back(atoi(portno.c_str()));
 159
 160                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portno.c_str());
 161                                                 }
 162                                                 else
 163                                                 {
 164                                                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %s, maybe you have another ssl or similar module loaded?", portno.c_str());
 165                                                 }
 166                                         }
 167                                 }
 168                         }
 169                 }
 170
 171                 std::string confdir(CONFIG_FILE);
 172                 // +1 so we the path ends with a /
 173                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 174
 175                 cafile  = Conf->ReadValue("gnutls", "cafile", 0);
 176                 crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
 177                 certfile        = Conf->ReadValue("gnutls", "certfile", 0);
 178                 keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
 179                 dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
 180
 181                 // Set all the default values needed.
 182                 if(cafile == "")
 183                         cafile = "ca.pem";
 184
 185                 if(crlfile == "")
 186                         crlfile = "crl.pem";
 187
 188                 if(certfile == "")
 189                         certfile = "cert.pem";
 190
 191                 if(keyfile == "")
 192                         keyfile = "key.pem";
 193
 194                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 195                         dh_bits = 1024;
 196
 197                 // Prepend relative paths with the path to the config directory.
 198                 if(cafile[0] != '/')
 199                         cafile = confdir + cafile;
 200
 201                 if(crlfile[0] != '/')
 202                         crlfile = confdir + crlfile;
 203
 204                 if(certfile[0] != '/')
 205                         certfile = confdir + certfile;
 206
 207                 if(keyfile[0] != '/')
 208                         keyfile = confdir + keyfile;
 209
 210                 if(gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 211                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 trust file: %s", cafile.c_str());
 212
 213                 if(gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 214                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 CRL file: %s", crlfile.c_str());
 215
 216                 // Guessing on the return value of this, manual doesn't say :|
 217                 if(gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 218                         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());
 219
 220                 // This may be on a large (once a day or week) timer eventually.
 221                 GenerateDHParams();
 222
 223                 DELETE(Conf);
 224         }
 225
 226         void GenerateDHParams()
 227         {
 228                 // Generate Diffie Hellman parameters - for use with DHE
 229                 // kx algorithms. These should be discarded and regenerated
 230                 // once a day, once a week or once a month. Depending on the
 231                 // security requirements.
 232
 233                 if(gnutls_dh_params_generate2(dh_params, dh_bits) < 0)
 234                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits)", dh_bits);
 235         }
 236
 237         virtual ~ModuleSSLGnuTLS()
 238         {
 239                 gnutls_dh_params_deinit(dh_params);
 240                 gnutls_certificate_free_credentials(x509_cred);
 241                 gnutls_global_deinit();
 242                 delete culllist;
 243         }
 244
 245         virtual void OnCleanup(int target_type, void* item)
 246         {
 247                 if(target_type == TYPE_USER)
 248                 {
 249                         userrec* user = (userrec*)item;
 250
 251                         if(user->GetExt("ssl", dummy) && isin(user->GetPort(), listenports))
 252                         {
 253                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 254                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 255                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Adding user %s to cull list", user->nick);
 256                                 culllist->AddItem(user, "SSL module unloading");
 257                         }
 258                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 259                         {
 260                                 ssl_cert* tofree;
 261                                 user->GetExt("ssl_cert", tofree);
 262                                 delete tofree;
 263                                 user->Shrink("ssl_cert");
 264                         }
 265                 }
 266         }
 267
 268         virtual void OnUnloadModule(Module* mod, const std::string &name)
 269         {
 270                 if(mod == this)
 271                 {
 272                         // We're being unloaded, kill all the users added to the cull list in OnCleanup
 273                         int numusers = culllist->Apply();
 274                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Killed %d users for unload of GnuTLS SSL module", numusers);
 275
 276                         for(unsigned int i = 0; i < listenports.size(); i++)
 277                                 ServerInstance->Config->DelIOHook(listenports[i]);
 278                 }
 279         }
 280
 281         virtual Version GetVersion()
 282         {
 283                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 284         }
 285
 286         void Implements(char* List)
 287         {
 288                 List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 289                 List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 290         }
 291
 292         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 293         {
 294                 issl_session* session = &sessions[fd];
 295
 296                 session->fd = fd;
 297                 session->inbuf = new char[inbufsize];
 298                 session->inbufoffset = 0;
 299
 300                 gnutls_init(&session->sess, GNUTLS_SERVER);
 301
 302                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 303                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 304                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 305                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 306
 307                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 308                  * This needs testing, but it's easy enough to rollback if need be
 309                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 310                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 311                  *
 312                  * With testing this seems to...not work :/
 313                  */
 314
 315                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 316
 317                 Handshake(session);
 318         }
 319
 320         virtual void OnRawSocketClose(int fd)
 321         {
 322                 ServerInstance->Log(DEBUG, "OnRawSocketClose: %d", fd);
 323                 CloseSession(&sessions[fd]);
 324
 325                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 326
 327                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 328                 {
 329                         ssl_cert* tofree;
 330                         user->GetExt("ssl_cert", tofree);
 331                         delete tofree;
 332                         user->Shrink("ssl_cert");
 333                 }
 334         }
 335
 336         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 337         {
 338                 issl_session* session = &sessions[fd];
 339
 340                 if (!session->sess)
 341                 {
 342                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: No session to read from");
 343                         readresult = 0;
 344                         CloseSession(session);
 345                         return 1;
 346                 }
 347
 348                 if (session->status == ISSL_HANDSHAKING_READ)
 349                 {
 350                         // The handshake isn't finished, try to finish it.
 351
 352                         if(Handshake(session))
 353                         {
 354                                 // Handshake successfully resumed.
 355                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: successfully resumed handshake");
 356                         }
 357                         else
 358                         {
 359                                 // Couldn't resume handshake.
 360                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: failed to resume handshake");
 361                                 return -1;
 362                         }
 363                 }
 364                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 365                 {
 366                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
 367                         return -1;
 368                 }
 369
 370                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 371
 372                 if (session->status == ISSL_HANDSHAKEN)
 373                 {
 374                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 375                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 376                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: gnutls_record_recv(sess, inbuf+%d, %d-%d)", session->inbufoffset, inbufsize, session->inbufoffset);
 377
 378                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 379
 380                         if (ret == 0)
 381                         {
 382                                 // Client closed connection.
 383                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Client closed the connection");
 384                                 readresult = 0;
 385                                 CloseSession(session);
 386                                 return 1;
 387                         }
 388                         else if (ret < 0)
 389                         {
 390                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 391                                 {
 392                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Not all SSL data read: %s", gnutls_strerror(ret));
 393                                         return -1;
 394                                 }
 395                                 else
 396                                 {
 397                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Error reading SSL data: %s", gnutls_strerror(ret));
 398                                         readresult = 0;
 399                                         CloseSession(session);
 400                                 }
 401                         }
 402                         else
 403                         {
 404                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 405                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 406                                 // 'buffer' is 'count' long
 407
 408                                 unsigned int length = ret + session->inbufoffset;
 409
 410                                 if(count <= length)
 411                                 {
 412                                         memcpy(buffer, session->inbuf, count);
 413                                         // Move the stuff left in inbuf to the beginning of it
 414                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 415                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 416                                         session->inbufoffset = length - count;
 417                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 418                                         readresult = count;
 419                                 }
 420                                 else
 421                                 {
 422                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 423                                         memcpy(buffer, session->inbuf, length);
 424                                         // Zero the offset, as there's nothing there..
 425                                         session->inbufoffset = 0;
 426                                         // As above
 427                                         readresult = length;
 428                                 }
 429                         }
 430                 }
 431                 else if(session->status == ISSL_CLOSING)
 432                 {
 433                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: session closing...");
 434                         readresult = 0;
 435                 }
 436
 437                 return 1;
 438         }
 439
 440         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 441         {
 442                 issl_session* session = &sessions[fd];
 443                 const char* sendbuffer = buffer;
 444
 445                 if(!session->sess)
 446                 {
 447                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: No session to write to");
 448                         CloseSession(session);
 449                         return 1;
 450                 }
 451
 452                 if(session->status == ISSL_HANDSHAKING_WRITE)
 453                 {
 454                         // The handshake isn't finished, try to finish it.
 455
 456                         if(Handshake(session))
 457                         {
 458                                 // Handshake successfully resumed.
 459                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: successfully resumed handshake");
 460                         }
 461                         else
 462                         {
 463                                 // Couldn't resume handshake.
 464                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: failed to resume handshake");
 465                         }
 466                 }
 467                 else if(session->status == ISSL_HANDSHAKING_READ)
 468                 {
 469                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");
 470                 }
 471
 472                 session->outbuf.append(sendbuffer, count);
 473                 sendbuffer = session->outbuf.c_str();
 474                 count = session->outbuf.size();
 475
 476                 if(session->status == ISSL_HANDSHAKEN)
 477                 {
 478                         int ret = gnutls_record_send(session->sess, sendbuffer, count);
 479
 480                         if(ret == 0)
 481                         {
 482                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Client closed the connection");
 483                                 CloseSession(session);
 484                         }
 485                         else if(ret < 0)
 486                         {
 487                                 if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 488                                 {
 489                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Not all SSL data written: %s", gnutls_strerror(ret));
 490                                 }
 491                                 else
 492                                 {
 493                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Error writing SSL data: %s", gnutls_strerror(ret));
 494                                         CloseSession(session);
 495                                 }
 496                         }
 497                         else
 498                         {
 499                                 session->outbuf = session->outbuf.substr(ret);
 500                         }
 501                 }
 502                 else if(session->status == ISSL_CLOSING)
 503                 {
 504                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: session closing...");
 505                 }
 506
 507                 return 1;
 508         }
 509
 510         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 511         virtual void OnWhois(userrec* source, userrec* dest)
 512         {
 513                 // Bugfix, only send this numeric for *our* SSL users
 514                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 515                 {
 516                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 517                 }
 518         }
 519
 520         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 521         {
 522                 // check if the linking module wants to know about OUR metadata
 523                 if(extname == "ssl")
 524                 {
 525                         // check if this user has an swhois field to send
 526                         if(user->GetExt(extname, dummy))
 527                         {
 528                                 // call this function in the linking module, let it format the data how it
 529                                 // sees fit, and send it on its way. We dont need or want to know how.
 530                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 531                         }
 532                 }
 533         }
 534
 535         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 536         {
 537                 // check if its our metadata key, and its associated with a user
 538                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 539                 {
 540                         userrec* dest = (userrec*)target;
 541                         // if they dont already have an ssl flag, accept the remote server's
 542                         if (!dest->GetExt(extname, dummy))
 543                         {
 544                                 dest->Extend(extname, "ON");
 545                         }
 546                 }
 547         }
 548
 549         bool Handshake(issl_session* session)
 550         {
 551                 int ret = gnutls_handshake(session->sess);
 552
 553                 if(ret < 0)
 554                 {
 555                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 556                         {
 557                                 // Handshake needs resuming later, read() or write() would have blocked.
 558
 559                                 if(gnutls_record_get_direction(session->sess) == 0)
 560                                 {
 561                                         // gnutls_handshake() wants to read() again.
 562                                         session->status = ISSL_HANDSHAKING_READ;
 563                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (reading) later, error string: %s", gnutls_strerror(ret));
 564                                 }
 565                                 else
 566                                 {
 567                                         // gnutls_handshake() wants to write() again.
 568                                         session->status = ISSL_HANDSHAKING_WRITE;
 569                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (writing) later, error string: %s", gnutls_strerror(ret));
 570                                         MakePollWrite(session);
 571                                 }
 572                         }
 573                         else
 574                         {
 575                                 // Handshake failed.
 576                                 CloseSession(session);
 577                            ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake failed, error string: %s", gnutls_strerror(ret));
 578                            session->status = ISSL_CLOSING;
 579                         }
 580
 581                         return false;
 582                 }
 583                 else
 584                 {
 585                         // Handshake complete.
 586                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake completed");
 587
 588                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 589                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 590                         if (extendme)
 591                         {
 592                                 if (!extendme->GetExt("ssl", dummy))
 593                                         extendme->Extend("ssl", "ON");
 594                         }
 595
 596                         // Change the seesion state
 597                         session->status = ISSL_HANDSHAKEN;
 598
 599                         // Finish writing, if any left
 600                         MakePollWrite(session);
 601
 602                         return true;
 603                 }
 604         }
 605
 606         virtual void OnPostConnect(userrec* user)
 607         {
 608                 // This occurs AFTER OnUserConnect so we can be sure the
 609                 // protocol module has propogated the NICK message.
 610                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 611                 {
 612                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 613                         std::deque<std::string>* metadata = new std::deque<std::string>;
 614                         metadata->push_back(user->nick);
 615                         metadata->push_back("ssl");             // The metadata id
 616                         metadata->push_back("ON");              // The value to send
 617                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 618                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 619                         DELETE(event);
 620                         DELETE(metadata);
 621
 622                         VerifyCertificate(&sessions[user->GetFd()],user);
 623                 }
 624         }
 625
 626         void MakePollWrite(issl_session* session)
 627         {
 628                 OnRawSocketWrite(session->fd, NULL, 0);
 629         }
 630
 631         void CloseSession(issl_session* session)
 632         {
 633                 if(session->sess)
 634                 {
 635                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 636                         gnutls_deinit(session->sess);
 637                 }
 638
 639                 if(session->inbuf)
 640                 {
 641                         delete[] session->inbuf;
 642                 }
 643
 644                 session->outbuf.clear();
 645                 session->inbuf = NULL;
 646                 session->sess = NULL;
 647                 session->status = ISSL_NONE;
 648         }
 649
 650         void VerifyCertificate(issl_session* session, userrec* user)
 651         {
 652                 unsigned int status;
 653                 const gnutls_datum_t* cert_list;
 654                 int ret;
 655                 unsigned int cert_list_size;
 656                 gnutls_x509_crt_t cert;
 657                 char name[MAXBUF];
 658                 unsigned char digest[MAXBUF];
 659                 size_t digest_size = sizeof(digest);
 660                 size_t name_size = sizeof(name);
 661                 ssl_cert* certinfo = new ssl_cert;
 662
 663                 user->Extend("ssl_cert",certinfo);
 664
 665                 /* This verification function uses the trusted CAs in the credentials
 666                  * structure. So you must have installed one or more CA certificates.
 667                  */
 668                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 669
 670                 if (ret < 0)
 671                 {
 672                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 673                         return;
 674                 }
 675
 676                 if (status & GNUTLS_CERT_INVALID)
 677                 {
 678                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 679                 }
 680                 else
 681                 {
 682                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 683                 }
 684                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 685                 {
 686                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 687                 }
 688                 else
 689                 {
 690                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 691                 }
 692                 if (status & GNUTLS_CERT_REVOKED)
 693                 {
 694                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 695                 }
 696                 else
 697                 {
 698                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 699                 }
 700                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 701                 {
 702                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 703                 }
 704                 else
 705                 {
 706                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 707                 }
 708
 709                 /* Up to here the process is the same for X.509 certificates and
 710                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 711                  * be easily extended to work with openpgp keys as well.
 712                  */
 713                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 714                 {
 715                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 716                         return;
 717                 }
 718
 719                 ret = gnutls_x509_crt_init(&cert);
 720                 if (ret < 0)
 721                 {
 722                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 723                         return;
 724                 }
 725
 726                 cert_list_size = 0;
 727                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 728                 if (cert_list == NULL)
 729                 {
 730                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 731                         return;
 732                 }
 733
 734                 /* This is not a real world example, since we only check the first
 735                  * certificate in the given chain.
 736                  */
 737
 738                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 739                 if (ret < 0)
 740                 {
 741                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 742                         return;
 743                 }
 744
 745                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 746
 747                 certinfo->data.insert(std::make_pair("dn",name));
 748
 749                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 750
 751                 certinfo->data.insert(std::make_pair("issuer",name));
 752
 753                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 754                 {
 755                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 756                 }
 757                 else
 758                 {
 759                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 760                         user->WriteServ("NOTICE %s :*** Your SSL Certificate fingerprint is: %s", user->nick, irc::hex(digest, digest_size).c_str());
 761                 }
 762
 763                 /* Beware here we do not check for errors.
 764                  */
 765                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 766                 {
 767                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 768                 }
 769
 770                 gnutls_x509_crt_deinit(cert);
 771
 772                 return;
 773         }
 774
 775 };
 776
 777 class ModuleSSLGnuTLSFactory : public ModuleFactory
 778 {
 779  public:
 780         ModuleSSLGnuTLSFactory()
 781         {
 782         }
 783
 784         ~ModuleSSLGnuTLSFactory()
 785         {
 786         }
 787
 788         virtual Module * CreateModule(InspIRCd* Me)
 789         {
 790                 return new ModuleSSLGnuTLS(Me);
 791         }
 792 };
 793
 794
 795 extern "C" void * init_module( void )
 796 {
 797         return new ModuleSSLGnuTLSFactory;
 798 }