src/modules/extra/m_ssl_gnutls.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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 /* $ModDep: transport.h */
  28 /* $CopyInstall: conf/key.pem $(CONPATH) */
  29 /* $CopyInstall: conf/cert.pem $(CONPATH) */
  30
  31 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING_READ, ISSL_HANDSHAKING_WRITE, ISSL_HANDSHAKEN, ISSL_CLOSING, ISSL_CLOSED };
  32
  33 static gnutls_x509_crt_t x509_cert;
  34 static gnutls_x509_privkey_t x509_key;
  35 static int cert_callback (gnutls_session_t session, const gnutls_datum_t * req_ca_rdn, int nreqs,
  36         const gnutls_pk_algorithm_t * sign_algos, int sign_algos_length, gnutls_retr_st * st) {
  37
  38         st->type = GNUTLS_CRT_X509;
  39         st->ncerts = 1;
  40         st->cert.x509 = &x509_cert;
  41         st->key.x509 = x509_key;
  42         st->deinit_all = 0;
  43
  44         return 0;
  45 }
  46
  47 static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t user_wrap, void* buffer, size_t size)
  48 {
  49         StreamSocket* user = reinterpret_cast<StreamSocket*>(user_wrap);
  50         if (user->GetEventMask() & FD_READ_WILL_BLOCK)
  51         {
  52                 errno = EAGAIN;
  53                 return -1;
  54         }
  55         int rv = recv(user->GetFd(), buffer, size, 0);
  56         if (rv < (int)size)
  57                 ServerInstance->SE->ChangeEventMask(user, FD_READ_WILL_BLOCK);
  58         return rv;
  59 }
  60
  61 static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t user_wrap, const void* buffer, size_t size)
  62 {
  63         StreamSocket* user = reinterpret_cast<StreamSocket*>(user_wrap);
  64         if (user->GetEventMask() & FD_WRITE_WILL_BLOCK)
  65         {
  66                 errno = EAGAIN;
  67                 return -1;
  68         }
  69         int rv = send(user->GetFd(), buffer, size, 0);
  70         if (rv < (int)size)
  71                 ServerInstance->SE->ChangeEventMask(user, FD_WRITE_WILL_BLOCK);
  72         return rv;
  73 }
  74
  75 /** Represents an SSL user's extra data
  76  */
  77 class issl_session : public classbase
  78 {
  79 public:
  80         issl_session()
  81         {
  82                 sess = NULL;
  83         }
  84
  85         gnutls_session_t sess;
  86         issl_status status;
  87 };
  88
  89 class CommandStartTLS : public Command
  90 {
  91  public:
  92         CommandStartTLS (Module* mod) : Command(mod, "STARTTLS")
  93         {
  94                 works_before_reg = true;
  95         }
  96
  97         CmdResult Handle (const std::vector<std::string> &parameters, User *user)
  98         {
  99                 /* changed from == REG_ALL to catch clients sending STARTTLS
 100                  * after NICK and USER but before OnUserConnect completes and
 101                  * give a proper error message (see bug #645) - dz
 102                  */
 103                 if (user->registered != REG_NONE)
 104                 {
 105                         user->WriteNumeric(691, "%s :STARTTLS is not permitted after client registration has started", user->nick.c_str());
 106                 }
 107                 else
 108                 {
 109                         if (!user->GetIOHook())
 110                         {
 111                                 user->WriteNumeric(670, "%s :STARTTLS successful, go ahead with TLS handshake", user->nick.c_str());
 112                                 user->AddIOHook(creator);
 113                                 creator->OnStreamSocketAccept(user, NULL, NULL);
 114                         }
 115                         else
 116                                 user->WriteNumeric(691, "%s :STARTTLS failure", user->nick.c_str());
 117                 }
 118
 119                 return CMD_FAILURE;
 120         }
 121 };
 122
 123 class ModuleSSLGnuTLS : public Module
 124 {
 125         issl_session* sessions;
 126
 127         gnutls_certificate_credentials x509_cred;
 128         gnutls_dh_params dh_params;
 129
 130         std::string keyfile;
 131         std::string certfile;
 132         std::string cafile;
 133         std::string crlfile;
 134         std::string sslports;
 135         int dh_bits;
 136
 137         bool cred_alloc;
 138
 139         CommandStartTLS starttls;
 140
 141         GenericCap capHandler;
 142  public:
 143
 144         ModuleSSLGnuTLS()
 145                 : starttls(this), capHandler(this, "tls")
 146         {
 147                 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
 148
 149                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 150
 151                 gnutls_global_init(); // This must be called once in the program
 152                 gnutls_x509_crt_init(&x509_cert);
 153                 gnutls_x509_privkey_init(&x509_key);
 154
 155                 cred_alloc = false;
 156                 // Needs the flag as it ignores a plain /rehash
 157                 OnModuleRehash(NULL,"ssl");
 158
 159                 // Void return, guess we assume success
 160                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 161                 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnPostConnect,
 162                         I_OnEvent, I_OnHookIO };
 163                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 164
 165                 ServerInstance->AddCommand(&starttls);
 166         }
 167
 168         void OnRehash(User* user)
 169         {
 170                 ConfigReader Conf;
 171
 172                 sslports.clear();
 173
 174                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 175                 {
 176                         ListenSocketBase* port = ServerInstance->ports[i];
 177                         if (port->hook != "gnutls")
 178                                 continue;
 179
 180                         const std::string& portid = port->GetBindDesc();
 181                         ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
 182
 183                         if (port->type == "clients" && port->GetIP() != "127.0.0.1")
 184                                 sslports.append(portid).append(";");
 185                 }
 186
 187                 if (!sslports.empty())
 188                         sslports.erase(sslports.end() - 1);
 189         }
 190
 191         void OnModuleRehash(User* user, const std::string &param)
 192         {
 193                 if(param != "ssl")
 194                         return;
 195
 196                 OnRehash(user);
 197
 198                 ConfigReader Conf;
 199
 200                 cafile = Conf.ReadValue("gnutls", "cafile", 0);
 201                 crlfile = Conf.ReadValue("gnutls", "crlfile", 0);
 202                 certfile = Conf.ReadValue("gnutls", "certfile", 0);
 203                 keyfile = Conf.ReadValue("gnutls", "keyfile", 0);
 204                 dh_bits = Conf.ReadInteger("gnutls", "dhbits", 0, false);
 205
 206                 // Set all the default values needed.
 207                 if (cafile.empty())
 208                         cafile = "conf/ca.pem";
 209
 210                 if (crlfile.empty())
 211                         crlfile = "conf/crl.pem";
 212
 213                 if (certfile.empty())
 214                         certfile = "conf/cert.pem";
 215
 216                 if (keyfile.empty())
 217                         keyfile = "conf/key.pem";
 218
 219                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 220                         dh_bits = 1024;
 221
 222                 int ret;
 223
 224                 if (cred_alloc)
 225                 {
 226                         // Deallocate the old credentials
 227                         gnutls_dh_params_deinit(dh_params);
 228                         gnutls_certificate_free_credentials(x509_cred);
 229                 }
 230                 else
 231                         cred_alloc = true;
 232
 233                 if((ret = gnutls_certificate_allocate_credentials(&x509_cred)) < 0)
 234                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
 235
 236                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 237                         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));
 238
 239                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 240                         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));
 241
 242                 FileReader reader;
 243
 244                 reader.LoadFile(certfile);
 245                 std::string cert_string = reader.Contents();
 246                 gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), cert_string.length() };
 247
 248                 reader.LoadFile(keyfile);
 249                 std::string key_string = reader.Contents();
 250                 gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), key_string.length() };
 251
 252                 // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
 253                 if((ret = gnutls_x509_crt_import(x509_cert, &cert_datum, GNUTLS_X509_FMT_PEM)) < 0)
 254                         throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + std::string(gnutls_strerror(ret)));
 255
 256                 if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0)
 257                         throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret)));
 258
 259                 if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_cert, 1, x509_key)) < 0)
 260                         throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret)));
 261
 262                 gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback);
 263
 264                 if((ret = gnutls_dh_params_init(&dh_params)) < 0)
 265                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
 266
 267                 // This may be on a large (once a day or week) timer eventually.
 268                 GenerateDHParams();
 269         }
 270
 271         void GenerateDHParams()
 272         {
 273                 // Generate Diffie Hellman parameters - for use with DHE
 274                 // kx algorithms. These should be discarded and regenerated
 275                 // once a day, once a week or once a month. Depending on the
 276                 // security requirements.
 277
 278                 int ret;
 279
 280                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 281                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 282         }
 283
 284         ~ModuleSSLGnuTLS()
 285         {
 286                 gnutls_x509_crt_deinit(x509_cert);
 287                 gnutls_x509_privkey_deinit(x509_key);
 288                 gnutls_dh_params_deinit(dh_params);
 289                 gnutls_certificate_free_credentials(x509_cred);
 290                 gnutls_global_deinit();
 291                 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
 292                 delete[] sessions;
 293         }
 294
 295         void OnCleanup(int target_type, void* item)
 296         {
 297                 if(target_type == TYPE_USER)
 298                 {
 299                         User* user = static_cast<User*>(item);
 300
 301                         if (user->GetIOHook() == this)
 302                         {
 303                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 304                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 305                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 306                                 user->DelIOHook();
 307                         }
 308                 }
 309         }
 310
 311         Version GetVersion()
 312         {
 313                 return Version("Provides SSL support for clients", VF_VENDOR);
 314         }
 315
 316
 317         void On005Numeric(std::string &output)
 318         {
 319                 if (!sslports.empty())
 320                         output.append(" SSL=" + sslports);
 321                 output.append(" STARTTLS");
 322         }
 323
 324         void OnHookIO(StreamSocket* user, ListenSocketBase* lsb)
 325         {
 326                 if (!user->GetIOHook() && lsb->hook == "gnutls")
 327                 {
 328                         /* Hook the user with our module */
 329                         user->AddIOHook(this);
 330                 }
 331         }
 332
 333         void OnRequest(Request& request)
 334         {
 335                 Module* sslinfo = ServerInstance->Modules->Find("m_sslinfo.so");
 336                 if (sslinfo)
 337                         sslinfo->OnRequest(request);
 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                                 user->SetError("Handshake Failed");
 406                                 return -1;
 407                         }
 408                 }
 409
 410                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 411
 412                 if (session->status == ISSL_HANDSHAKEN)
 413                 {
 414                         char* buffer = ServerInstance->GetReadBuffer();
 415                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 416                         int ret = gnutls_record_recv(session->sess, buffer, bufsiz);
 417                         if (ret > 0)
 418                         {
 419                                 recvq.append(buffer, ret);
 420                                 return 1;
 421                         }
 422                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 423                         {
 424                                 return 0;
 425                         }
 426                         else if (ret == 0)
 427                         {
 428                                 user->SetError("SSL Connection closed");
 429                                 CloseSession(session);
 430                                 return -1;
 431                         }
 432                         else
 433                         {
 434                                 user->SetError(gnutls_strerror(ret));
 435                                 CloseSession(session);
 436                                 return -1;
 437                         }
 438                 }
 439                 else if (session->status == ISSL_CLOSING)
 440                         return -1;
 441
 442                 return 0;
 443         }
 444
 445         int OnStreamSocketWrite(StreamSocket* user, std::string& sendq)
 446         {
 447                 issl_session* session = &sessions[user->GetFd()];
 448
 449                 if (!session->sess)
 450                 {
 451                         CloseSession(session);
 452                         user->SetError("No SSL session");
 453                         return -1;
 454                 }
 455
 456                 if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ)
 457                 {
 458                         // The handshake isn't finished, try to finish it.
 459                         Handshake(session, user);
 460                         if (session->status != ISSL_CLOSING)
 461                                 return 0;
 462                         user->SetError("Handshake Failed");
 463                         return -1;
 464                 }
 465
 466                 int ret = 0;
 467
 468                 if (session->status == ISSL_HANDSHAKEN)
 469                 {
 470                         ret = gnutls_record_send(session->sess, sendq.data(), sendq.length());
 471
 472                         if (ret == (int)sendq.length())
 473                         {
 474                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE);
 475                                 return 1;
 476                         }
 477                         else if (ret > 0)
 478                         {
 479                                 sendq = sendq.substr(ret);
 480                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 481                                 return 0;
 482                         }
 483                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 484                         {
 485                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 486                                 return 0;
 487                         }
 488                         else if (ret == 0)
 489                         {
 490                                 CloseSession(session);
 491                                 user->SetError("SSL Connection closed");
 492                                 return -1;
 493                         }
 494                         else // (ret < 0)
 495                         {
 496                                 user->SetError(gnutls_strerror(ret));
 497                                 CloseSession(session);
 498                                 return -1;
 499                         }
 500                 }
 501
 502                 return 0;
 503         }
 504
 505         bool Handshake(issl_session* session, StreamSocket* user)
 506         {
 507                 int ret = gnutls_handshake(session->sess);
 508
 509                 if (ret < 0)
 510                 {
 511                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 512                         {
 513                                 // Handshake needs resuming later, read() or write() would have blocked.
 514
 515                                 if(gnutls_record_get_direction(session->sess) == 0)
 516                                 {
 517                                         // gnutls_handshake() wants to read() again.
 518                                         session->status = ISSL_HANDSHAKING_READ;
 519                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 520                                 }
 521                                 else
 522                                 {
 523                                         // gnutls_handshake() wants to write() again.
 524                                         session->status = ISSL_HANDSHAKING_WRITE;
 525                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 526                                 }
 527                         }
 528                         else
 529                         {
 530                                 CloseSession(session);
 531                                 session->status = ISSL_CLOSING;
 532                         }
 533
 534                         return false;
 535                 }
 536                 else
 537                 {
 538                         // Change the seesion state
 539                         session->status = ISSL_HANDSHAKEN;
 540
 541                         VerifyCertificate(session,user);
 542
 543                         // Finish writing, if any left
 544                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 545
 546                         return true;
 547                 }
 548         }
 549
 550         void OnPostConnect(User* user)
 551         {
 552                 // This occurs AFTER OnUserConnect so we can be sure the
 553                 // protocol module has propagated the NICK message.
 554                 if (user->GetIOHook() == this && (IS_LOCAL(user)))
 555                 {
 556                         if (sessions[user->GetFd()].sess)
 557                         {
 558                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 559                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 560                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 561                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), cipher.c_str());
 562                         }
 563                 }
 564         }
 565
 566         void CloseSession(issl_session* session)
 567         {
 568                 if(session->sess)
 569                 {
 570                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 571                         gnutls_deinit(session->sess);
 572                 }
 573
 574                 session->sess = NULL;
 575                 session->status = ISSL_NONE;
 576         }
 577
 578         void VerifyCertificate(issl_session* session, Extensible* user)
 579         {
 580                 if (!session->sess || !user)
 581                         return;
 582
 583                 Module* sslinfo = ServerInstance->Modules->Find("m_sslinfo.so");
 584                 if (!sslinfo)
 585                         return;
 586
 587                 unsigned int status;
 588                 const gnutls_datum_t* cert_list;
 589                 int ret;
 590                 unsigned int cert_list_size;
 591                 gnutls_x509_crt_t cert;
 592                 char name[MAXBUF];
 593                 unsigned char digest[MAXBUF];
 594                 size_t digest_size = sizeof(digest);
 595                 size_t name_size = sizeof(name);
 596                 ssl_cert* certinfo = new ssl_cert;
 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                         goto info_done;
 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                         goto info_done;
 622                 }
 623
 624                 ret = gnutls_x509_crt_init(&cert);
 625                 if (ret < 0)
 626                 {
 627                         certinfo->error = gnutls_strerror(ret);
 628                         goto info_done;
 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, GNUTLS_DIG_MD5, 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 info_done:
 675                 SSLCertSubmission(user, this, sslinfo, certinfo);
 676         }
 677
 678         void OnEvent(Event& ev)
 679         {
 680                 capHandler.HandleEvent(ev);
 681         }
 682 };
 683
 684 MODULE_INIT(ModuleSSLGnuTLS)