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                 ServerInstance->PublishInterface("InspSocketHook", this);
  82
  83                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
  84                 inbufsize = ServerInstance->Config->NetBufferSize;
  85
  86                 gnutls_global_init(); // This must be called once in the program
  87
  88                 if(gnutls_certificate_allocate_credentials(&x509_cred) != 0)
  89                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to allocate certificate credentials");
  90
  91                 // Guessing return meaning
  92                 if(gnutls_dh_params_init(&dh_params) < 0)
  93                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters");
  94
  95                 // Needs the flag as it ignores a plain /rehash
  96                 OnRehash("ssl");
  97
  98                 // Void return, guess we assume success
  99                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 100         }
 101
 102         virtual void OnRehash(const std::string &param)
 103         {
 104                 if(param != "ssl")
 105                         return;
 106
 107                 Conf = new ConfigReader(ServerInstance);
 108
 109                 for(unsigned int i = 0; i < listenports.size(); i++)
 110                 {
 111                         ServerInstance->Config->DelIOHook(listenports[i]);
 112                 }
 113
 114                 listenports.clear();
 115
 116                 for(int i = 0; i < Conf->Enumerate("bind"); i++)
 117                 {
 118                         // For each <bind> tag
 119                         if(((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "gnutls"))
 120                         {
 121                                 // Get the port we're meant to be listening on with SSL
 122                                 std::string port = Conf->ReadValue("bind", "port", i);
 123                                 irc::portparser portrange(port, false);
 124                                 long portno = -1;
 125                                 while ((portno = portrange.GetToken()))
 126                                 {
 127                                         if (ServerInstance->Config->AddIOHook(portno, this))
 128                                         {
 129                                                 listenports.push_back(portno);
 130                                                 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %d", portno);
 131                                         }
 132                                         else
 133                                         {
 134                                                 ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 135                                         }
 136                                 }
 137                         }
 138                 }
 139
 140                 std::string confdir(CONFIG_FILE);
 141                 // +1 so we the path ends with a /
 142                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 143
 144                 cafile  = Conf->ReadValue("gnutls", "cafile", 0);
 145                 crlfile = Conf->ReadValue("gnutls", "crlfile", 0);
 146                 certfile        = Conf->ReadValue("gnutls", "certfile", 0);
 147                 keyfile = Conf->ReadValue("gnutls", "keyfile", 0);
 148                 dh_bits = Conf->ReadInteger("gnutls", "dhbits", 0, false);
 149
 150                 // Set all the default values needed.
 151                 if(cafile == "")
 152                         cafile = "ca.pem";
 153
 154                 if(crlfile == "")
 155                         crlfile = "crl.pem";
 156
 157                 if(certfile == "")
 158                         certfile = "cert.pem";
 159
 160                 if(keyfile == "")
 161                         keyfile = "key.pem";
 162
 163                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 164                         dh_bits = 1024;
 165
 166                 // Prepend relative paths with the path to the config directory.
 167                 if(cafile[0] != '/')
 168                         cafile = confdir + cafile;
 169
 170                 if(crlfile[0] != '/')
 171                         crlfile = confdir + crlfile;
 172
 173                 if(certfile[0] != '/')
 174                         certfile = confdir + certfile;
 175
 176                 if(keyfile[0] != '/')
 177                         keyfile = confdir + keyfile;
 178
 179                 if(gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 180                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 trust file: %s", cafile.c_str());
 181
 182                 if(gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 183                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to set X.509 CRL file: %s", crlfile.c_str());
 184
 185                 // Guessing on the return value of this, manual doesn't say :|
 186                 if(gnutls_certificate_set_x509_key_file (x509_cred, certfile.c_str(), keyfile.c_str(), GNUTLS_X509_FMT_PEM) < 0)
 187                         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());
 188
 189                 // This may be on a large (once a day or week) timer eventually.
 190                 GenerateDHParams();
 191
 192                 DELETE(Conf);
 193         }
 194
 195         void GenerateDHParams()
 196         {
 197                 // Generate Diffie Hellman parameters - for use with DHE
 198                 // kx algorithms. These should be discarded and regenerated
 199                 // once a day, once a week or once a month. Depending on the
 200                 // security requirements.
 201
 202                 if(gnutls_dh_params_generate2(dh_params, dh_bits) < 0)
 203                         ServerInstance->Log(DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits)", dh_bits);
 204         }
 205
 206         virtual ~ModuleSSLGnuTLS()
 207         {
 208                 gnutls_dh_params_deinit(dh_params);
 209                 gnutls_certificate_free_credentials(x509_cred);
 210                 gnutls_global_deinit();
 211                 delete culllist;
 212         }
 213
 214         virtual void OnCleanup(int target_type, void* item)
 215         {
 216                 if(target_type == TYPE_USER)
 217                 {
 218                         userrec* user = (userrec*)item;
 219
 220                         if(user->GetExt("ssl", dummy) && isin(user->GetPort(), listenports))
 221                         {
 222                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 223                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 224                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Adding user %s to cull list", user->nick);
 225                                 culllist->AddItem(user, "SSL module unloading");
 226                         }
 227                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 228                         {
 229                                 ssl_cert* tofree;
 230                                 user->GetExt("ssl_cert", tofree);
 231                                 delete tofree;
 232                                 user->Shrink("ssl_cert");
 233                         }
 234                 }
 235         }
 236
 237         virtual void OnUnloadModule(Module* mod, const std::string &name)
 238         {
 239                 if(mod == this)
 240                 {
 241                         // We're being unloaded, kill all the users added to the cull list in OnCleanup
 242                         int numusers = culllist->Apply();
 243                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Killed %d users for unload of GnuTLS SSL module", numusers);
 244
 245                         for(unsigned int i = 0; i < listenports.size(); i++)
 246                                 ServerInstance->Config->DelIOHook(listenports[i]);
 247                 }
 248         }
 249
 250         virtual Version GetVersion()
 251         {
 252                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 253         }
 254
 255         void Implements(char* List)
 256         {
 257                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 258                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 259         }
 260
 261         virtual char* OnRequest(Request* request)
 262         {
 263                 ISHRequest* ISR = (ISHRequest*)request;
 264                 if (strcmp("IS_NAME", request->GetId()) == 0)
 265                 {
 266                         return "gnutls";
 267                 }
 268                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 269                 {
 270                         return ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 271                 }
 272                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 273                 {
 274                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 275                 }
 276                 return NULL;
 277         }
 278
 279
 280         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 281         {
 282                 issl_session* session = &sessions[fd];
 283
 284                 session->fd = fd;
 285                 session->inbuf = new char[inbufsize];
 286                 session->inbufoffset = 0;
 287
 288                 gnutls_init(&session->sess, GNUTLS_SERVER);
 289
 290                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 291                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 292                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 293                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 294
 295                 /* This is an experimental change to avoid a warning on 64bit systems about casting between integer and pointer of different sizes
 296                  * This needs testing, but it's easy enough to rollback if need be
 297                  * Old: gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 298                  * New: gnutls_transport_set_ptr(session->sess, &fd); // Give gnutls the fd for the socket.
 299                  *
 300                  * With testing this seems to...not work :/
 301                  */
 302
 303                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 304
 305                 Handshake(session);
 306         }
 307
 308         virtual void OnRawSocketConnect(int fd)
 309         {
 310                 issl_session* session = &sessions[fd];
 311
 312                 session->fd = fd;
 313                 session->inbuf = new char[inbufsize];
 314                 session->inbufoffset = 0;
 315
 316                 gnutls_init(&session->sess, GNUTLS_SERVER);
 317
 318                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 319                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 320                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 321
 322                 gnutls_transport_set_ptr(session->sess, (gnutls_transport_ptr_t) fd); // Give gnutls the fd for the socket.
 323
 324                 Handshake(session);
 325         }
 326
 327         virtual void OnRawSocketClose(int fd)
 328         {
 329                 ServerInstance->Log(DEBUG, "OnRawSocketClose: %d", fd);
 330                 CloseSession(&sessions[fd]);
 331
 332                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 333
 334                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 335                 {
 336                         ssl_cert* tofree;
 337                         user->GetExt("ssl_cert", tofree);
 338                         delete tofree;
 339                         user->Shrink("ssl_cert");
 340                 }
 341         }
 342
 343         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 344         {
 345                 issl_session* session = &sessions[fd];
 346
 347                 if (!session->sess)
 348                 {
 349                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: No session to read from");
 350                         readresult = 0;
 351                         CloseSession(session);
 352                         return 1;
 353                 }
 354
 355                 if (session->status == ISSL_HANDSHAKING_READ)
 356                 {
 357                         // The handshake isn't finished, try to finish it.
 358
 359                         if(Handshake(session))
 360                         {
 361                                 // Handshake successfully resumed.
 362                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: successfully resumed handshake");
 363                         }
 364                         else
 365                         {
 366                                 // Couldn't resume handshake.
 367                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: failed to resume handshake");
 368                                 return -1;
 369                         }
 370                 }
 371                 else if (session->status == ISSL_HANDSHAKING_WRITE)
 372                 {
 373                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
 374                         return -1;
 375                 }
 376
 377                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 378
 379                 if (session->status == ISSL_HANDSHAKEN)
 380                 {
 381                         // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 382                         // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 383                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: gnutls_record_recv(sess, inbuf+%d, %d-%d)", session->inbufoffset, inbufsize, session->inbufoffset);
 384
 385                         int ret = gnutls_record_recv(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 386
 387                         if (ret == 0)
 388                         {
 389                                 // Client closed connection.
 390                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Client closed the connection");
 391                                 readresult = 0;
 392                                 CloseSession(session);
 393                                 return 1;
 394                         }
 395                         else if (ret < 0)
 396                         {
 397                                 if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 398                                 {
 399                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Not all SSL data read: %s", gnutls_strerror(ret));
 400                                         return -1;
 401                                 }
 402                                 else
 403                                 {
 404                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: Error reading SSL data: %s", gnutls_strerror(ret));
 405                                         readresult = 0;
 406                                         CloseSession(session);
 407                                 }
 408                         }
 409                         else
 410                         {
 411                                 // Read successfully 'ret' bytes into inbuf + inbufoffset
 412                                 // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 413                                 // 'buffer' is 'count' long
 414
 415                                 unsigned int length = ret + session->inbufoffset;
 416
 417                                 if(count <= length)
 418                                 {
 419                                         memcpy(buffer, session->inbuf, count);
 420                                         // Move the stuff left in inbuf to the beginning of it
 421                                         memcpy(session->inbuf, session->inbuf + count, (length - count));
 422                                         // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 423                                         session->inbufoffset = length - count;
 424                                         // Insp uses readresult as the count of how much data there is in buffer, so:
 425                                         readresult = count;
 426                                 }
 427                                 else
 428                                 {
 429                                         // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 430                                         memcpy(buffer, session->inbuf, length);
 431                                         // Zero the offset, as there's nothing there..
 432                                         session->inbufoffset = 0;
 433                                         // As above
 434                                         readresult = length;
 435                                 }
 436                         }
 437                 }
 438                 else if(session->status == ISSL_CLOSING)
 439                 {
 440                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketRead: session closing...");
 441                         readresult = 0;
 442                 }
 443
 444                 return 1;
 445         }
 446
 447         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 448         {
 449                 issl_session* session = &sessions[fd];
 450                 const char* sendbuffer = buffer;
 451
 452                 if(!session->sess)
 453                 {
 454                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: No session to write to");
 455                         CloseSession(session);
 456                         return 1;
 457                 }
 458
 459                 if(session->status == ISSL_HANDSHAKING_WRITE)
 460                 {
 461                         // The handshake isn't finished, try to finish it.
 462
 463                         if(Handshake(session))
 464                         {
 465                                 // Handshake successfully resumed.
 466                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: successfully resumed handshake");
 467                         }
 468                         else
 469                         {
 470                                 // Couldn't resume handshake.
 471                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: failed to resume handshake");
 472                         }
 473                 }
 474                 else if(session->status == ISSL_HANDSHAKING_READ)
 475                 {
 476                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");
 477                 }
 478
 479                 session->outbuf.append(sendbuffer, count);
 480                 sendbuffer = session->outbuf.c_str();
 481                 count = session->outbuf.size();
 482
 483                 if(session->status == ISSL_HANDSHAKEN)
 484                 {
 485                         int ret = gnutls_record_send(session->sess, sendbuffer, count);
 486
 487                         if(ret == 0)
 488                         {
 489                                 ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Client closed the connection");
 490                                 CloseSession(session);
 491                         }
 492                         else if(ret < 0)
 493                         {
 494                                 if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 495                                 {
 496                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Not all SSL data written: %s", gnutls_strerror(ret));
 497                                 }
 498                                 else
 499                                 {
 500                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: Error writing SSL data: %s", gnutls_strerror(ret));
 501                                         CloseSession(session);
 502                                 }
 503                         }
 504                         else
 505                         {
 506                                 session->outbuf = session->outbuf.substr(ret);
 507                         }
 508                 }
 509                 else if(session->status == ISSL_CLOSING)
 510                 {
 511                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: OnRawSocketWrite: session closing...");
 512                 }
 513
 514                 return 1;
 515         }
 516
 517         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 518         virtual void OnWhois(userrec* source, userrec* dest)
 519         {
 520                 // Bugfix, only send this numeric for *our* SSL users
 521                 if(dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 522                 {
 523                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 524                 }
 525         }
 526
 527         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 528         {
 529                 // check if the linking module wants to know about OUR metadata
 530                 if(extname == "ssl")
 531                 {
 532                         // check if this user has an swhois field to send
 533                         if(user->GetExt(extname, dummy))
 534                         {
 535                                 // call this function in the linking module, let it format the data how it
 536                                 // sees fit, and send it on its way. We dont need or want to know how.
 537                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 538                         }
 539                 }
 540         }
 541
 542         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 543         {
 544                 // check if its our metadata key, and its associated with a user
 545                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 546                 {
 547                         userrec* dest = (userrec*)target;
 548                         // if they dont already have an ssl flag, accept the remote server's
 549                         if (!dest->GetExt(extname, dummy))
 550                         {
 551                                 dest->Extend(extname, "ON");
 552                         }
 553                 }
 554         }
 555
 556         bool Handshake(issl_session* session)
 557         {
 558                 int ret = gnutls_handshake(session->sess);
 559
 560                 if(ret < 0)
 561                 {
 562                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 563                         {
 564                                 // Handshake needs resuming later, read() or write() would have blocked.
 565
 566                                 if(gnutls_record_get_direction(session->sess) == 0)
 567                                 {
 568                                         // gnutls_handshake() wants to read() again.
 569                                         session->status = ISSL_HANDSHAKING_READ;
 570                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (reading) later, error string: %s", gnutls_strerror(ret));
 571                                 }
 572                                 else
 573                                 {
 574                                         // gnutls_handshake() wants to write() again.
 575                                         session->status = ISSL_HANDSHAKING_WRITE;
 576                                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake needs resuming (writing) later, error string: %s", gnutls_strerror(ret));
 577                                         MakePollWrite(session);
 578                                 }
 579                         }
 580                         else
 581                         {
 582                                 // Handshake failed.
 583                                 CloseSession(session);
 584                            ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake failed, error string: %s", gnutls_strerror(ret));
 585                            session->status = ISSL_CLOSING;
 586                         }
 587
 588                         return false;
 589                 }
 590                 else
 591                 {
 592                         // Handshake complete.
 593                         ServerInstance->Log(DEBUG, "m_ssl_gnutls.so: Handshake completed");
 594
 595                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 596                         userrec* extendme = ServerInstance->FindDescriptor(session->fd);
 597                         if (extendme)
 598                         {
 599                                 if (!extendme->GetExt("ssl", dummy))
 600                                         extendme->Extend("ssl", "ON");
 601                         }
 602
 603                         // Change the seesion state
 604                         session->status = ISSL_HANDSHAKEN;
 605
 606                         // Finish writing, if any left
 607                         MakePollWrite(session);
 608
 609                         return true;
 610                 }
 611         }
 612
 613         virtual void OnPostConnect(userrec* user)
 614         {
 615                 // This occurs AFTER OnUserConnect so we can be sure the
 616                 // protocol module has propogated the NICK message.
 617                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 618                 {
 619                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 620                         std::deque<std::string>* metadata = new std::deque<std::string>;
 621                         metadata->push_back(user->nick);
 622                         metadata->push_back("ssl");             // The metadata id
 623                         metadata->push_back("ON");              // The value to send
 624                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 625                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 626                         DELETE(event);
 627                         DELETE(metadata);
 628
 629                         VerifyCertificate(&sessions[user->GetFd()],user);
 630                 }
 631         }
 632
 633         void MakePollWrite(issl_session* session)
 634         {
 635                 OnRawSocketWrite(session->fd, NULL, 0);
 636         }
 637
 638         void CloseSession(issl_session* session)
 639         {
 640                 if(session->sess)
 641                 {
 642                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 643                         gnutls_deinit(session->sess);
 644                 }
 645
 646                 if(session->inbuf)
 647                 {
 648                         delete[] session->inbuf;
 649                 }
 650
 651                 session->outbuf.clear();
 652                 session->inbuf = NULL;
 653                 session->sess = NULL;
 654                 session->status = ISSL_NONE;
 655         }
 656
 657         void VerifyCertificate(issl_session* session, Extensible* user)
 658         {
 659                 unsigned int status;
 660                 const gnutls_datum_t* cert_list;
 661                 int ret;
 662                 unsigned int cert_list_size;
 663                 gnutls_x509_crt_t cert;
 664                 char name[MAXBUF];
 665                 unsigned char digest[MAXBUF];
 666                 size_t digest_size = sizeof(digest);
 667                 size_t name_size = sizeof(name);
 668                 ssl_cert* certinfo = new ssl_cert;
 669
 670                 user->Extend("ssl_cert",certinfo);
 671
 672                 /* This verification function uses the trusted CAs in the credentials
 673                  * structure. So you must have installed one or more CA certificates.
 674                  */
 675                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 676
 677                 if (ret < 0)
 678                 {
 679                         certinfo->data.insert(std::make_pair("error",std::string(gnutls_strerror(ret))));
 680                         return;
 681                 }
 682
 683                 if (status & GNUTLS_CERT_INVALID)
 684                 {
 685                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(1)));
 686                 }
 687                 else
 688                 {
 689                         certinfo->data.insert(std::make_pair("invalid",ConvToStr(0)));
 690                 }
 691                 if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
 692                 {
 693                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 694                 }
 695                 else
 696                 {
 697                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 698                 }
 699                 if (status & GNUTLS_CERT_REVOKED)
 700                 {
 701                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(1)));
 702                 }
 703                 else
 704                 {
 705                         certinfo->data.insert(std::make_pair("revoked",ConvToStr(0)));
 706                 }
 707                 if (status & GNUTLS_CERT_SIGNER_NOT_CA)
 708                 {
 709                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 710                 }
 711                 else
 712                 {
 713                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 714                 }
 715
 716                 /* Up to here the process is the same for X.509 certificates and
 717                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 718                  * be easily extended to work with openpgp keys as well.
 719                  */
 720                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 721                 {
 722                         certinfo->data.insert(std::make_pair("error","No X509 keys sent"));
 723                         return;
 724                 }
 725
 726                 ret = gnutls_x509_crt_init(&cert);
 727                 if (ret < 0)
 728                 {
 729                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 730                         return;
 731                 }
 732
 733                 cert_list_size = 0;
 734                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 735                 if (cert_list == NULL)
 736                 {
 737                         certinfo->data.insert(std::make_pair("error","No certificate was found"));
 738                         return;
 739                 }
 740
 741                 /* This is not a real world example, since we only check the first
 742                  * certificate in the given chain.
 743                  */
 744
 745                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 746                 if (ret < 0)
 747                 {
 748                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 749                         return;
 750                 }
 751
 752                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 753
 754                 certinfo->data.insert(std::make_pair("dn",name));
 755
 756                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 757
 758                 certinfo->data.insert(std::make_pair("issuer",name));
 759
 760                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 761                 {
 762                         certinfo->data.insert(std::make_pair("error",gnutls_strerror(ret)));
 763                 }
 764                 else
 765                 {
 766                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(digest, digest_size)));
 767                 }
 768
 769                 /* Beware here we do not check for errors.
 770                  */
 771                 if ((gnutls_x509_crt_get_expiration_time(cert) < time(0)) || (gnutls_x509_crt_get_activation_time(cert) > time(0)))
 772                 {
 773                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 774                 }
 775
 776                 gnutls_x509_crt_deinit(cert);
 777
 778                 return;
 779         }
 780
 781 };
 782
 783 class ModuleSSLGnuTLSFactory : public ModuleFactory
 784 {
 785  public:
 786         ModuleSSLGnuTLSFactory()
 787         {
 788         }
 789
 790         ~ModuleSSLGnuTLSFactory()
 791         {
 792         }
 793
 794         virtual Module * CreateModule(InspIRCd* Me)
 795         {
 796                 return new ModuleSSLGnuTLS(Me);
 797         }
 798 };
 799
 800
 801 extern "C" void * init_module( void )
 802 {
 803         return new ModuleSSLGnuTLSFactory;
 804 }