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
 126         std::string keyfile;
 127         std::string certfile;
 128
 129         std::string cafile;
 130         std::string crlfile;
 131         std::string sslports;
 132         int dh_bits;
 133
 134         bool cred_alloc;
 135
 136         CommandStartTLS starttls;
 137
 138         GenericCap capHandler;
 139         ServiceProvider iohook;
 140  public:
 141
 142         ModuleSSLGnuTLS()
 143                 : starttls(this), capHandler(this, "tls"), iohook(this, "ssl/gnutls", SERVICE_IOHOOK)
 144         {
 145                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 146
 147                 gnutls_global_init(); // This must be called once in the program
 148                 gnutls_x509_crt_init(&x509_cert);
 149                 gnutls_x509_privkey_init(&x509_key);
 150
 151                 cred_alloc = false;
 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                 ConfigReader Conf;
 168
 169                 sslports.clear();
 170
 171                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 172                 {
 173                         ListenSocket* port = ServerInstance->ports[i];
 174                         if (port->bind_tag->getString("ssl") != "gnutls")
 175                                 continue;
 176
 177                         const std::string& portid = port->bind_desc;
 178                         ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
 179
 180                         if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 181                                 sslports.append(portid).append(";");
 182                 }
 183
 184                 if (!sslports.empty())
 185                         sslports.erase(sslports.end() - 1);
 186         }
 187
 188         void OnModuleRehash(User* user, const std::string &param)
 189         {
 190                 if(param != "ssl")
 191                         return;
 192
 193                 OnRehash(user);
 194
 195                 ConfigReader Conf;
 196
 197                 cafile = Conf.ReadValue("gnutls", "cafile", 0);
 198                 crlfile = Conf.ReadValue("gnutls", "crlfile", 0);
 199                 certfile = Conf.ReadValue("gnutls", "certfile", 0);
 200                 keyfile = Conf.ReadValue("gnutls", "keyfile", 0);
 201                 dh_bits = Conf.ReadInteger("gnutls", "dhbits", 0, false);
 202
 203                 // Set all the default values needed.
 204                 if (cafile.empty())
 205                         cafile = "conf/ca.pem";
 206
 207                 if (crlfile.empty())
 208                         crlfile = "conf/crl.pem";
 209
 210                 if (certfile.empty())
 211                         certfile = "conf/cert.pem";
 212
 213                 if (keyfile.empty())
 214                         keyfile = "conf/key.pem";
 215
 216                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 217                         dh_bits = 1024;
 218
 219                 int ret;
 220
 221                 if (cred_alloc)
 222                 {
 223                         // Deallocate the old credentials
 224                         gnutls_dh_params_deinit(dh_params);
 225                         gnutls_certificate_free_credentials(x509_cred);
 226                 }
 227                 else
 228                         cred_alloc = true;
 229
 230                 if((ret = gnutls_certificate_allocate_credentials(&x509_cred)) < 0)
 231                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
 232
 233                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 234                         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));
 235
 236                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 237                         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));
 238
 239                 FileReader reader;
 240
 241                 reader.LoadFile(certfile);
 242                 std::string cert_string = reader.Contents();
 243                 gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), cert_string.length() };
 244
 245                 reader.LoadFile(keyfile);
 246                 std::string key_string = reader.Contents();
 247                 gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), key_string.length() };
 248
 249                 // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
 250                 if((ret = gnutls_x509_crt_import(x509_cert, &cert_datum, GNUTLS_X509_FMT_PEM)) < 0)
 251                         throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + std::string(gnutls_strerror(ret)));
 252
 253                 if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0)
 254                         throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret)));
 255
 256                 if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_cert, 1, x509_key)) < 0)
 257                         throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret)));
 258
 259                 gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback);
 260
 261                 if((ret = gnutls_dh_params_init(&dh_params)) < 0)
 262                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
 263
 264                 // This may be on a large (once a day or week) timer eventually.
 265                 GenerateDHParams();
 266         }
 267
 268         void GenerateDHParams()
 269         {
 270                 // Generate Diffie Hellman parameters - for use with DHE
 271                 // kx algorithms. These should be discarded and regenerated
 272                 // once a day, once a week or once a month. Depending on the
 273                 // security requirements.
 274
 275                 int ret;
 276
 277                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 278                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 279         }
 280
 281         ~ModuleSSLGnuTLS()
 282         {
 283                 gnutls_x509_crt_deinit(x509_cert);
 284                 gnutls_x509_privkey_deinit(x509_key);
 285                 gnutls_dh_params_deinit(dh_params);
 286                 gnutls_certificate_free_credentials(x509_cred);
 287                 gnutls_global_deinit();
 288                 delete[] sessions;
 289         }
 290
 291         void OnCleanup(int target_type, void* item)
 292         {
 293                 if(target_type == TYPE_USER)
 294                 {
 295                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
 296
 297                         if (user && user->eh.GetIOHook() == this)
 298                         {
 299                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 300                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 301                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 302                         }
 303                 }
 304         }
 305
 306         Version GetVersion()
 307         {
 308                 return Version("Provides SSL support for clients", VF_VENDOR);
 309         }
 310
 311
 312         void On005Numeric(std::string &output)
 313         {
 314                 if (!sslports.empty())
 315                         output.append(" SSL=" + sslports);
 316                 output.append(" STARTTLS");
 317         }
 318
 319         void OnHookIO(StreamSocket* user, ListenSocket* lsb)
 320         {
 321                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "gnutls")
 322                 {
 323                         /* Hook the user with our module */
 324                         user->AddIOHook(this);
 325                 }
 326         }
 327
 328         void OnRequest(Request& request)
 329         {
 330                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 331                 {
 332                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 333                         int fd = req.sock->GetFd();
 334                         issl_session* session = &sessions[fd];
 335
 336                         req.cert = session->cert;
 337                 }
 338         }
 339
 340         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 341         {
 342                 int fd = user->GetFd();
 343                 issl_session* session = &sessions[fd];
 344
 345                 /* For STARTTLS: Don't try and init a session on a socket that already has a session */
 346                 if (session->sess)
 347                         return;
 348
 349                 gnutls_init(&session->sess, GNUTLS_SERVER);
 350
 351                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 352                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 353                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 354
 355                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 356                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 357                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 358
 359                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 360
 361                 Handshake(session, user);
 362         }
 363
 364         void OnStreamSocketConnect(StreamSocket* user)
 365         {
 366                 issl_session* session = &sessions[user->GetFd()];
 367
 368                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 369
 370                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 371                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 372                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 373                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 374                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 375                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 376
 377                 Handshake(session, user);
 378         }
 379
 380         void OnStreamSocketClose(StreamSocket* user)
 381         {
 382                 CloseSession(&sessions[user->GetFd()]);
 383         }
 384
 385         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 386         {
 387                 issl_session* session = &sessions[user->GetFd()];
 388
 389                 if (!session->sess)
 390                 {
 391                         CloseSession(session);
 392                         user->SetError("No SSL session");
 393                         return -1;
 394                 }
 395
 396                 if (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE)
 397                 {
 398                         // The handshake isn't finished, try to finish it.
 399
 400                         if(!Handshake(session, user))
 401                         {
 402                                 if (session->status != ISSL_CLOSING)
 403                                         return 0;
 404                                 return -1;
 405                         }
 406                 }
 407
 408                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 409
 410                 if (session->status == ISSL_HANDSHAKEN)
 411                 {
 412                         char* buffer = ServerInstance->GetReadBuffer();
 413                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 414                         int ret = gnutls_record_recv(session->sess, buffer, bufsiz);
 415                         if (ret > 0)
 416                         {
 417                                 recvq.append(buffer, ret);
 418                                 return 1;
 419                         }
 420                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 421                         {
 422                                 return 0;
 423                         }
 424                         else if (ret == 0)
 425                         {
 426                                 user->SetError("SSL Connection closed");
 427                                 CloseSession(session);
 428                                 return -1;
 429                         }
 430                         else
 431                         {
 432                                 user->SetError(gnutls_strerror(ret));
 433                                 CloseSession(session);
 434                                 return -1;
 435                         }
 436                 }
 437                 else if (session->status == ISSL_CLOSING)
 438                         return -1;
 439
 440                 return 0;
 441         }
 442
 443         int OnStreamSocketWrite(StreamSocket* user, std::string& sendq)
 444         {
 445                 issl_session* session = &sessions[user->GetFd()];
 446
 447                 if (!session->sess)
 448                 {
 449                         CloseSession(session);
 450                         user->SetError("No SSL session");
 451                         return -1;
 452                 }
 453
 454                 if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ)
 455                 {
 456                         // The handshake isn't finished, try to finish it.
 457                         Handshake(session, user);
 458                         if (session->status != ISSL_CLOSING)
 459                                 return 0;
 460                         return -1;
 461                 }
 462
 463                 int ret = 0;
 464
 465                 if (session->status == ISSL_HANDSHAKEN)
 466                 {
 467                         ret = gnutls_record_send(session->sess, sendq.data(), sendq.length());
 468
 469                         if (ret == (int)sendq.length())
 470                         {
 471                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE);
 472                                 return 1;
 473                         }
 474                         else if (ret > 0)
 475                         {
 476                                 sendq = sendq.substr(ret);
 477                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 478                                 return 0;
 479                         }
 480                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 481                         {
 482                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 483                                 return 0;
 484                         }
 485                         else if (ret == 0)
 486                         {
 487                                 CloseSession(session);
 488                                 user->SetError("SSL Connection closed");
 489                                 return -1;
 490                         }
 491                         else // (ret < 0)
 492                         {
 493                                 user->SetError(gnutls_strerror(ret));
 494                                 CloseSession(session);
 495                                 return -1;
 496                         }
 497                 }
 498
 499                 return 0;
 500         }
 501
 502         bool Handshake(issl_session* session, StreamSocket* user)
 503         {
 504                 int ret = gnutls_handshake(session->sess);
 505
 506                 if (ret < 0)
 507                 {
 508                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 509                         {
 510                                 // Handshake needs resuming later, read() or write() would have blocked.
 511
 512                                 if(gnutls_record_get_direction(session->sess) == 0)
 513                                 {
 514                                         // gnutls_handshake() wants to read() again.
 515                                         session->status = ISSL_HANDSHAKING_READ;
 516                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 517                                 }
 518                                 else
 519                                 {
 520                                         // gnutls_handshake() wants to write() again.
 521                                         session->status = ISSL_HANDSHAKING_WRITE;
 522                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 523                                 }
 524                         }
 525                         else
 526                         {
 527                                 user->SetError(std::string("Handshake Failed - ") + gnutls_strerror(ret));
 528                                 CloseSession(session);
 529                                 session->status = ISSL_CLOSING;
 530                         }
 531
 532                         return false;
 533                 }
 534                 else
 535                 {
 536                         // Change the seesion state
 537                         session->status = ISSL_HANDSHAKEN;
 538
 539                         VerifyCertificate(session,user);
 540
 541                         // Finish writing, if any left
 542                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 543
 544                         return true;
 545                 }
 546         }
 547
 548         void OnUserConnect(LocalUser* user)
 549         {
 550                 if (user->eh.GetIOHook() == this)
 551                 {
 552                         if (sessions[user->GetFd()].sess)
 553                         {
 554                                 SSLCertSubmission(user, this, ServerInstance->Modules->Find("m_sslinfo.so"), sessions[user->GetFd()].cert);
 555                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 556                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 557                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 558                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), cipher.c_str());
 559                         }
 560                 }
 561         }
 562
 563         void CloseSession(issl_session* session)
 564         {
 565                 if (session->sess)
 566                 {
 567                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 568                         gnutls_deinit(session->sess);
 569                 }
 570                 session->sess = NULL;
 571                 session->cert = NULL;
 572                 session->status = ISSL_NONE;
 573         }
 574
 575         void VerifyCertificate(issl_session* session, StreamSocket* user)
 576         {
 577                 if (!session->sess || !user || session->cert)
 578                         return;
 579
 580                 unsigned int status;
 581                 const gnutls_datum_t* cert_list;
 582                 int ret;
 583                 unsigned int cert_list_size;
 584                 gnutls_x509_crt_t cert;
 585                 char name[MAXBUF];
 586                 unsigned char digest[MAXBUF];
 587                 size_t digest_size = sizeof(digest);
 588                 size_t name_size = sizeof(name);
 589                 ssl_cert* certinfo = new ssl_cert;
 590                 session->cert = certinfo;
 591
 592                 /* This verification function uses the trusted CAs in the credentials
 593                  * structure. So you must have installed one or more CA certificates.
 594                  */
 595                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 596
 597                 if (ret < 0)
 598                 {
 599                         certinfo->error = std::string(gnutls_strerror(ret));
 600                         return;
 601                 }
 602
 603                 certinfo->invalid = (status & GNUTLS_CERT_INVALID);
 604                 certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND);
 605                 certinfo->revoked = (status & GNUTLS_CERT_REVOKED);
 606                 certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA);
 607
 608                 /* Up to here the process is the same for X.509 certificates and
 609                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 610                  * be easily extended to work with openpgp keys as well.
 611                  */
 612                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 613                 {
 614                         certinfo->error = "No X509 keys sent";
 615                         return;
 616                 }
 617
 618                 ret = gnutls_x509_crt_init(&cert);
 619                 if (ret < 0)
 620                 {
 621                         certinfo->error = gnutls_strerror(ret);
 622                         return;
 623                 }
 624
 625                 cert_list_size = 0;
 626                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 627                 if (cert_list == NULL)
 628                 {
 629                         certinfo->error = "No certificate was found";
 630                         goto info_done_dealloc;
 631                 }
 632
 633                 /* This is not a real world example, since we only check the first
 634                  * certificate in the given chain.
 635                  */
 636
 637                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 638                 if (ret < 0)
 639                 {
 640                         certinfo->error = gnutls_strerror(ret);
 641                         goto info_done_dealloc;
 642                 }
 643
 644                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 645                 certinfo->dn = name;
 646
 647                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 648                 certinfo->issuer = name;
 649
 650                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 651                 {
 652                         certinfo->error = gnutls_strerror(ret);
 653                 }
 654                 else
 655                 {
 656                         certinfo->fingerprint = irc::hex(digest, digest_size);
 657                 }
 658
 659                 /* Beware here we do not check for errors.
 660                  */
 661                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 662                 {
 663                         certinfo->error = "Not activated, or expired certificate";
 664                 }
 665
 666 info_done_dealloc:
 667                 gnutls_x509_crt_deinit(cert);
 668         }
 669
 670         void OnEvent(Event& ev)
 671         {
 672                 capHandler.HandleEvent(ev);
 673         }
 674 };
 675
 676 MODULE_INIT(ModuleSSLGnuTLS)