src/modules/extra/m_ssl_gnutls.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *          the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include <gnutls/gnutls.h>
  16 #include <gnutls/x509.h>
  17 #include "ssl.h"
  18 #include "m_cap.h"
  19
  20 #ifdef WINDOWS
  21 #pragma comment(lib, "libgnutls-13.lib")
  22 #endif
  23
  24 /* $ModDesc: Provides SSL support for clients */
  25 /* $CompileFlags: pkgconfincludes("gnutls","/gnutls/gnutls.h","") */
  26 /* $LinkerFlags: rpath("pkg-config --libs gnutls") pkgconflibs("gnutls","/libgnutls.so","-lgnutls") */
  27 /* $CopyInstall: conf/key.pem $(CONPATH) -m 0400 -o $(INSTUID) */
  28 /* $CopyInstall: conf/cert.pem $(CONPATH) -m 0444 */
  29
  30 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  31
  32 static gnutls_x509_crt_t x509_cert;
  33 static gnutls_x509_privkey_t x509_key;
  34 static int cert_callback (gnutls_session_t session, const gnutls_datum_t * req_ca_rdn, int nreqs,
  35         const gnutls_pk_algorithm_t * sign_algos, int sign_algos_length, gnutls_retr_st * st) {
  36
  37         st->type = GNUTLS_CRT_X509;
  38         st->ncerts = 1;
  39         st->cert.x509 = &x509_cert;
  40         st->key.x509 = x509_key;
  41         st->deinit_all = 0;
  42
  43         return 0;
  44 }
  45
  46 static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t user_wrap, void* buffer, size_t size)
  47 {
  48         StreamSocket* user = reinterpret_cast<StreamSocket*>(user_wrap);
  49         if (user->GetEventMask() & FD_READ_WILL_BLOCK)
  50         {
  51                 errno = EAGAIN;
  52                 return -1;
  53         }
  54         int rv = recv(user->GetFd(), buffer, size, 0);
  55         if (rv < (int)size)
  56                 ServerInstance->SE->ChangeEventMask(user, FD_READ_WILL_BLOCK);
  57         return rv;
  58 }
  59
  60 static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t user_wrap, const void* buffer, size_t size)
  61 {
  62         StreamSocket* user = reinterpret_cast<StreamSocket*>(user_wrap);
  63         if (user->GetEventMask() & FD_WRITE_WILL_BLOCK)
  64         {
  65                 errno = EAGAIN;
  66                 return -1;
  67         }
  68         int rv = send(user->GetFd(), buffer, size, 0);
  69         if (rv < (int)size)
  70                 ServerInstance->SE->ChangeEventMask(user, FD_WRITE_WILL_BLOCK);
  71         return rv;
  72 }
  73
  74 /** Represents an SSL user's extra data
  75  */
  76 class issl_session
  77 {
  78 public:
  79         gnutls_session_t sess;
  80         issl_status status;
  81         reference<ssl_cert> cert;
  82         issl_session() : sess(NULL) {}
  83 };
  84
  85 class CommandStartTLS : public SplitCommand
  86 {
  87  public:
  88         CommandStartTLS (Module* mod) : SplitCommand(mod, "STARTTLS")
  89         {
  90                 works_before_reg = true;
  91         }
  92
  93         CmdResult HandleLocal(const std::vector<std::string> &parameters, LocalUser *user)
  94         {
  95                 /* changed from == REG_ALL to catch clients sending STARTTLS
  96                  * after NICK and USER but before OnUserConnect completes and
  97                  * give a proper error message (see bug #645) - dz
  98                  */
  99                 if (user->registered != REG_NONE)
 100                 {
 101                         user->WriteNumeric(691, "%s :STARTTLS is not permitted after client registration has started", user->nick.c_str());
 102                 }
 103                 else
 104                 {
 105                         if (!user->eh.GetIOHook())
 106                         {
 107                                 user->WriteNumeric(670, "%s :STARTTLS successful, go ahead with TLS handshake", user->nick.c_str());
 108                                 user->eh.AddIOHook(creator);
 109                                 creator->OnStreamSocketAccept(&user->eh, NULL, NULL);
 110                         }
 111                         else
 112                                 user->WriteNumeric(691, "%s :STARTTLS failure", user->nick.c_str());
 113                 }
 114
 115                 return CMD_FAILURE;
 116         }
 117 };
 118
 119 class ModuleSSLGnuTLS : public Module
 120 {
 121         issl_session* sessions;
 122
 123         gnutls_certificate_credentials x509_cred;
 124         gnutls_dh_params dh_params;
 125         gnutls_digest_algorithm_t hash;
 126
 127         std::string sslports;
 128         int dh_bits;
 129
 130         bool cred_alloc;
 131
 132         CommandStartTLS starttls;
 133
 134         GenericCap capHandler;
 135         ServiceProvider iohook;
 136  public:
 137
 138         ModuleSSLGnuTLS()
 139                 : starttls(this), capHandler(this, "tls"), iohook(this, "ssl/gnutls", SERVICE_IOHOOK)
 140         {
 141                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 142
 143                 gnutls_global_init(); // This must be called once in the program
 144                 gnutls_x509_crt_init(&x509_cert);
 145                 gnutls_x509_privkey_init(&x509_key);
 146
 147                 cred_alloc = false;
 148         }
 149
 150         void init()
 151         {
 152                 // Needs the flag as it ignores a plain /rehash
 153                 OnModuleRehash(NULL,"ssl");
 154
 155                 // Void return, guess we assume success
 156                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 157                 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnUserConnect,
 158                         I_OnEvent, I_OnHookIO };
 159                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 160
 161                 ServerInstance->Modules->AddService(iohook);
 162                 ServerInstance->AddCommand(&starttls);
 163         }
 164
 165         void OnRehash(User* user)
 166         {
 167                 sslports.clear();
 168
 169                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 170                 {
 171                         ListenSocket* port = ServerInstance->ports[i];
 172                         if (port->bind_tag->getString("ssl") != "gnutls")
 173                                 continue;
 174
 175                         const std::string& portid = port->bind_desc;
 176                         ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
 177
 178                         if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 179                                 sslports.append(portid).append(";");
 180                 }
 181
 182                 if (!sslports.empty())
 183                         sslports.erase(sslports.end() - 1);
 184         }
 185
 186         void OnModuleRehash(User* user, const std::string &param)
 187         {
 188                 if(param != "ssl")
 189                         return;
 190
 191                 std::string keyfile;
 192                 std::string certfile;
 193                 std::string cafile;
 194                 std::string crlfile;
 195                 OnRehash(user);
 196
 197                 ConfigTag* Conf = ServerInstance->Config->ConfValue("gnutls");
 198
 199                 cafile = Conf->getString("cafile", "conf/ca.pem");
 200                 crlfile = Conf->getString("crlfile", "conf/crl.pem");
 201                 certfile = Conf->getString("certfile", "conf/cert.pem");
 202                 keyfile = Conf->getString("keyfile", "conf/key.pem");
 203                 dh_bits = Conf->getInt("dhbits");
 204                 std::string hashname = Conf->getString("hash", "md5");
 205
 206                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 207                         dh_bits = 1024;
 208
 209                 if (hashname == "md5")
 210                         hash = GNUTLS_DIG_MD5;
 211                 else if (hashname == "sha1")
 212                         hash = GNUTLS_DIG_SHA1;
 213                 else
 214                         throw ModuleException("Unknown hash type " + hashname);
 215
 216
 217                 int ret;
 218
 219                 if (cred_alloc)
 220                 {
 221                         // Deallocate the old credentials
 222                         gnutls_dh_params_deinit(dh_params);
 223                         gnutls_certificate_free_credentials(x509_cred);
 224                 }
 225                 else
 226                         cred_alloc = true;
 227
 228                 if((ret = gnutls_certificate_allocate_credentials(&x509_cred)) < 0)
 229                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
 230
 231                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 232                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to set X.509 trust file '%s': %s", cafile.c_str(), gnutls_strerror(ret));
 233
 234                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 235                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to set X.509 CRL file '%s': %s", crlfile.c_str(), gnutls_strerror(ret));
 236
 237                 FileReader reader;
 238
 239                 reader.LoadFile(certfile);
 240                 std::string cert_string = reader.Contents();
 241                 gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), cert_string.length() };
 242
 243                 reader.LoadFile(keyfile);
 244                 std::string key_string = reader.Contents();
 245                 gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), key_string.length() };
 246
 247                 // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
 248                 if((ret = gnutls_x509_crt_import(x509_cert, &cert_datum, GNUTLS_X509_FMT_PEM)) < 0)
 249                         throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + std::string(gnutls_strerror(ret)));
 250
 251                 if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0)
 252                         throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret)));
 253
 254                 if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_cert, 1, x509_key)) < 0)
 255                         throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret)));
 256
 257                 gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback);
 258
 259                 if((ret = gnutls_dh_params_init(&dh_params)) < 0)
 260                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
 261
 262                 // This may be on a large (once a day or week) timer eventually.
 263                 GenerateDHParams();
 264         }
 265
 266         void GenerateDHParams()
 267         {
 268                 // Generate Diffie Hellman parameters - for use with DHE
 269                 // kx algorithms. These should be discarded and regenerated
 270                 // once a day, once a week or once a month. Depending on the
 271                 // security requirements.
 272
 273                 int ret;
 274
 275                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 276                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 277         }
 278
 279         ~ModuleSSLGnuTLS()
 280         {
 281                 gnutls_x509_crt_deinit(x509_cert);
 282                 gnutls_x509_privkey_deinit(x509_key);
 283                 if (cred_alloc)
 284                 {
 285                         gnutls_dh_params_deinit(dh_params);
 286                         gnutls_certificate_free_credentials(x509_cred);
 287                 }
 288                 gnutls_global_deinit();
 289                 delete[] sessions;
 290         }
 291
 292         void OnCleanup(int target_type, void* item)
 293         {
 294                 if(target_type == TYPE_USER)
 295                 {
 296                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
 297
 298                         if (user && user->eh.GetIOHook() == this)
 299                         {
 300                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 301                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 302                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 303                         }
 304                 }
 305         }
 306
 307         Version GetVersion()
 308         {
 309                 return Version("Provides SSL support for clients", VF_VENDOR);
 310         }
 311
 312
 313         void On005Numeric(std::string &output)
 314         {
 315                 if (!sslports.empty())
 316                         output.append(" SSL=" + sslports);
 317                 output.append(" STARTTLS");
 318         }
 319
 320         void OnHookIO(StreamSocket* user, ListenSocket* lsb)
 321         {
 322                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "gnutls")
 323                 {
 324                         /* Hook the user with our module */
 325                         user->AddIOHook(this);
 326                 }
 327         }
 328
 329         void OnRequest(Request& request)
 330         {
 331                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 332                 {
 333                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 334                         int fd = req.sock->GetFd();
 335                         issl_session* session = &sessions[fd];
 336
 337                         req.cert = session->cert;
 338                 }
 339         }
 340
 341         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 342         {
 343                 int fd = user->GetFd();
 344                 issl_session* session = &sessions[fd];
 345
 346                 /* For STARTTLS: Don't try and init a session on a socket that already has a session */
 347                 if (session->sess)
 348                         return;
 349
 350                 gnutls_init(&session->sess, GNUTLS_SERVER);
 351
 352                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 353                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 354                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 355
 356                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 357                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 358                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 359
 360                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 361
 362                 Handshake(session, user);
 363         }
 364
 365         void OnStreamSocketConnect(StreamSocket* user)
 366         {
 367                 issl_session* session = &sessions[user->GetFd()];
 368
 369                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 370
 371                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 372                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 373                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 374                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 375                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 376                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 377
 378                 Handshake(session, user);
 379         }
 380
 381         void OnStreamSocketClose(StreamSocket* user)
 382         {
 383                 CloseSession(&sessions[user->GetFd()]);
 384         }
 385
 386         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 387         {
 388                 issl_session* session = &sessions[user->GetFd()];
 389
 390                 if (!session->sess)
 391                 {
 392                         CloseSession(session);
 393                         user->SetError("No SSL session");
 394                         return -1;
 395                 }
 396
 397                 if (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE)
 398                 {
 399                         // The handshake isn't finished, try to finish it.
 400
 401                         if(!Handshake(session, user))
 402                         {
 403                                 if (session->status != ISSL_CLOSING)
 404                                         return 0;
 405                                 return -1;
 406                         }
 407                 }
 408
 409                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 410
 411                 if (session->status == ISSL_HANDSHAKEN)
 412                 {
 413                         char* buffer = ServerInstance->GetReadBuffer();
 414                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 415                         int ret = gnutls_record_recv(session->sess, buffer, bufsiz);
 416                         if (ret > 0)
 417                         {
 418                                 recvq.append(buffer, ret);
 419                                 return 1;
 420                         }
 421                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 422                         {
 423                                 return 0;
 424                         }
 425                         else if (ret == 0)
 426                         {
 427                                 user->SetError("SSL Connection closed");
 428                                 CloseSession(session);
 429                                 return -1;
 430                         }
 431                         else
 432                         {
 433                                 user->SetError(gnutls_strerror(ret));
 434                                 CloseSession(session);
 435                                 return -1;
 436                         }
 437                 }
 438                 else if (session->status == ISSL_CLOSING)
 439                         return -1;
 440
 441                 return 0;
 442         }
 443
 444         int OnStreamSocketWrite(StreamSocket* user, std::string& sendq)
 445         {
 446                 issl_session* session = &sessions[user->GetFd()];
 447
 448                 if (!session->sess)
 449                 {
 450                         CloseSession(session);
 451                         user->SetError("No SSL session");
 452                         return -1;
 453                 }
 454
 455                 if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ)
 456                 {
 457                         // The handshake isn't finished, try to finish it.
 458                         Handshake(session, user);
 459                         if (session->status != ISSL_CLOSING)
 460                                 return 0;
 461                         return -1;
 462                 }
 463
 464                 int ret = 0;
 465
 466                 if (session->status == ISSL_HANDSHAKEN)
 467                 {
 468                         ret = gnutls_record_send(session->sess, sendq.data(), sendq.length());
 469
 470                         if (ret == (int)sendq.length())
 471                         {
 472                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE);
 473                                 return 1;
 474                         }
 475                         else if (ret > 0)
 476                         {
 477                                 sendq = sendq.substr(ret);
 478                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 479                                 return 0;
 480                         }
 481                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 482                         {
 483                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 484                                 return 0;
 485                         }
 486                         else if (ret == 0)
 487                         {
 488                                 CloseSession(session);
 489                                 user->SetError("SSL Connection closed");
 490                                 return -1;
 491                         }
 492                         else // (ret < 0)
 493                         {
 494                                 user->SetError(gnutls_strerror(ret));
 495                                 CloseSession(session);
 496                                 return -1;
 497                         }
 498                 }
 499
 500                 return 0;
 501         }
 502
 503         bool Handshake(issl_session* session, StreamSocket* user)
 504         {
 505                 int ret = gnutls_handshake(session->sess);
 506
 507                 if (ret < 0)
 508                 {
 509                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 510                         {
 511                                 // Handshake needs resuming later, read() or write() would have blocked.
 512
 513                                 if(gnutls_record_get_direction(session->sess) == 0)
 514                                 {
 515                                         // gnutls_handshake() wants to read() again.
 516                                         session->status = ISSL_HANDSHAKING_READ;
 517                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 518                                 }
 519                                 else
 520                                 {
 521                                         // gnutls_handshake() wants to write() again.
 522                                         session->status = ISSL_HANDSHAKING_WRITE;
 523                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 524                                 }
 525                         }
 526                         else
 527                         {
 528                                 user->SetError(std::string("Handshake Failed - ") + gnutls_strerror(ret));
 529                                 CloseSession(session);
 530                                 session->status = ISSL_CLOSING;
 531                         }
 532
 533                         return false;
 534                 }
 535                 else
 536                 {
 537                         // Change the seesion state
 538                         session->status = ISSL_HANDSHAKEN;
 539
 540                         VerifyCertificate(session,user);
 541
 542                         // Finish writing, if any left
 543                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 544
 545                         return true;
 546                 }
 547         }
 548
 549         void OnUserConnect(LocalUser* user)
 550         {
 551                 if (user->eh.GetIOHook() == this)
 552                 {
 553                         if (sessions[user->GetFd()].sess)
 554                         {
 555                                 ssl_cert* cert = sessions[user->GetFd()].cert;
 556                                 SSLCertSubmission(user, this, ServerInstance->Modules->Find("m_sslinfo.so"), cert);
 557                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 558                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 559                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 560                                 if (cert->fingerprint.empty())
 561                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), cipher.c_str());
 562                                 else
 563                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\""
 564                                                 " and your SSL fingerprint is %s", user->nick.c_str(), cipher.c_str(), cert->fingerprint.c_str());
 565                         }
 566                 }
 567         }
 568
 569         void CloseSession(issl_session* session)
 570         {
 571                 if (session->sess)
 572                 {
 573                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 574                         gnutls_deinit(session->sess);
 575                 }
 576                 session->sess = NULL;
 577                 session->cert = NULL;
 578                 session->status = ISSL_NONE;
 579         }
 580
 581         void VerifyCertificate(issl_session* session, StreamSocket* user)
 582         {
 583                 if (!session->sess || !user || session->cert)
 584                         return;
 585
 586                 unsigned int status;
 587                 const gnutls_datum_t* cert_list;
 588                 int ret;
 589                 unsigned int cert_list_size;
 590                 gnutls_x509_crt_t cert;
 591                 char name[MAXBUF];
 592                 unsigned char digest[MAXBUF];
 593                 size_t digest_size = sizeof(digest);
 594                 size_t name_size = sizeof(name);
 595                 ssl_cert* certinfo = new ssl_cert;
 596                 session->cert = certinfo;
 597
 598                 /* This verification function uses the trusted CAs in the credentials
 599                  * structure. So you must have installed one or more CA certificates.
 600                  */
 601                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 602
 603                 if (ret < 0)
 604                 {
 605                         certinfo->error = std::string(gnutls_strerror(ret));
 606                         return;
 607                 }
 608
 609                 certinfo->invalid = (status & GNUTLS_CERT_INVALID);
 610                 certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND);
 611                 certinfo->revoked = (status & GNUTLS_CERT_REVOKED);
 612                 certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA);
 613
 614                 /* Up to here the process is the same for X.509 certificates and
 615                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 616                  * be easily extended to work with openpgp keys as well.
 617                  */
 618                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 619                 {
 620                         certinfo->error = "No X509 keys sent";
 621                         return;
 622                 }
 623
 624                 ret = gnutls_x509_crt_init(&cert);
 625                 if (ret < 0)
 626                 {
 627                         certinfo->error = gnutls_strerror(ret);
 628                         return;
 629                 }
 630
 631                 cert_list_size = 0;
 632                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 633                 if (cert_list == NULL)
 634                 {
 635                         certinfo->error = "No certificate was found";
 636                         goto info_done_dealloc;
 637                 }
 638
 639                 /* This is not a real world example, since we only check the first
 640                  * certificate in the given chain.
 641                  */
 642
 643                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 644                 if (ret < 0)
 645                 {
 646                         certinfo->error = gnutls_strerror(ret);
 647                         goto info_done_dealloc;
 648                 }
 649
 650                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 651                 certinfo->dn = name;
 652
 653                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 654                 certinfo->issuer = name;
 655
 656                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, hash, digest, &digest_size)) < 0)
 657                 {
 658                         certinfo->error = gnutls_strerror(ret);
 659                 }
 660                 else
 661                 {
 662                         certinfo->fingerprint = irc::hex(digest, digest_size);
 663                 }
 664
 665                 /* Beware here we do not check for errors.
 666                  */
 667                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 668                 {
 669                         certinfo->error = "Not activated, or expired certificate";
 670                 }
 671
 672 info_done_dealloc:
 673                 gnutls_x509_crt_deinit(cert);
 674         }
 675
 676         void OnEvent(Event& ev)
 677         {
 678                 capHandler.HandleEvent(ev);
 679         }
 680 };
 681
 682 MODULE_INIT(ModuleSSLGnuTLS)