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         }
 153
 154         void init()
 155         {
 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_OnUserConnect,
 162                         I_OnEvent, I_OnHookIO };
 163                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 164
 165                 ServerInstance->Modules->AddService(iohook);
 166                 ServerInstance->AddCommand(&starttls);
 167         }
 168
 169         void OnRehash(User* user)
 170         {
 171                 sslports.clear();
 172
 173                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 174                 {
 175                         ListenSocket* port = ServerInstance->ports[i];
 176                         if (port->bind_tag->getString("ssl") != "gnutls")
 177                                 continue;
 178
 179                         const std::string& portid = port->bind_desc;
 180                         ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
 181
 182                         if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 183                                 sslports.append(portid).append(";");
 184                 }
 185
 186                 if (!sslports.empty())
 187                         sslports.erase(sslports.end() - 1);
 188         }
 189
 190         void OnModuleRehash(User* user, const std::string &param)
 191         {
 192                 if(param != "ssl")
 193                         return;
 194
 195                 OnRehash(user);
 196
 197                 ConfigTag* Conf = ServerInstance->Config->ConfValue("gnutls");
 198
 199                 cafile = Conf->getString("cafile");
 200                 crlfile = Conf->getString("crlfile");
 201                 certfile = Conf->getString("certfile");
 202                 keyfile = Conf->getString("keyfile");
 203                 dh_bits = Conf->getInt("dhbits");
 204
 205                 // Set all the default values needed.
 206                 if (cafile.empty())
 207                         cafile = "conf/ca.pem";
 208
 209                 if (crlfile.empty())
 210                         crlfile = "conf/crl.pem";
 211
 212                 if (certfile.empty())
 213                         certfile = "conf/cert.pem";
 214
 215                 if (keyfile.empty())
 216                         keyfile = "conf/key.pem";
 217
 218                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 219                         dh_bits = 1024;
 220
 221                 int ret;
 222
 223                 if (cred_alloc)
 224                 {
 225                         // Deallocate the old credentials
 226                         gnutls_dh_params_deinit(dh_params);
 227                         gnutls_certificate_free_credentials(x509_cred);
 228                 }
 229                 else
 230                         cred_alloc = true;
 231
 232                 if((ret = gnutls_certificate_allocate_credentials(&x509_cred)) < 0)
 233                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
 234
 235                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 236                         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));
 237
 238                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 239                         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));
 240
 241                 FileReader reader;
 242
 243                 reader.LoadFile(certfile);
 244                 std::string cert_string = reader.Contents();
 245                 gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), cert_string.length() };
 246
 247                 reader.LoadFile(keyfile);
 248                 std::string key_string = reader.Contents();
 249                 gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), key_string.length() };
 250
 251                 // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
 252                 if((ret = gnutls_x509_crt_import(x509_cert, &cert_datum, GNUTLS_X509_FMT_PEM)) < 0)
 253                         throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + std::string(gnutls_strerror(ret)));
 254
 255                 if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0)
 256                         throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret)));
 257
 258                 if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_cert, 1, x509_key)) < 0)
 259                         throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret)));
 260
 261                 gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback);
 262
 263                 if((ret = gnutls_dh_params_init(&dh_params)) < 0)
 264                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
 265
 266                 // This may be on a large (once a day or week) timer eventually.
 267                 GenerateDHParams();
 268         }
 269
 270         void GenerateDHParams()
 271         {
 272                 // Generate Diffie Hellman parameters - for use with DHE
 273                 // kx algorithms. These should be discarded and regenerated
 274                 // once a day, once a week or once a month. Depending on the
 275                 // security requirements.
 276
 277                 int ret;
 278
 279                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 280                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 281         }
 282
 283         ~ModuleSSLGnuTLS()
 284         {
 285                 gnutls_x509_crt_deinit(x509_cert);
 286                 gnutls_x509_privkey_deinit(x509_key);
 287                 if (cred_alloc)
 288                 {
 289                         gnutls_dh_params_deinit(dh_params);
 290                         gnutls_certificate_free_credentials(x509_cred);
 291                 }
 292                 gnutls_global_deinit();
 293                 delete[] sessions;
 294         }
 295
 296         void OnCleanup(int target_type, void* item)
 297         {
 298                 if(target_type == TYPE_USER)
 299                 {
 300                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
 301
 302                         if (user && user->eh.GetIOHook() == this)
 303                         {
 304                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 305                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 306                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 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, ListenSocket* lsb)
 325         {
 326                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "gnutls")
 327                 {
 328                         /* Hook the user with our module */
 329                         user->AddIOHook(this);
 330                 }
 331         }
 332
 333         void OnRequest(Request& request)
 334         {
 335                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 336                 {
 337                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 338                         int fd = req.sock->GetFd();
 339                         issl_session* session = &sessions[fd];
 340
 341                         req.cert = session->cert;
 342                 }
 343         }
 344
 345         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 346         {
 347                 int fd = user->GetFd();
 348                 issl_session* session = &sessions[fd];
 349
 350                 /* For STARTTLS: Don't try and init a session on a socket that already has a session */
 351                 if (session->sess)
 352                         return;
 353
 354                 gnutls_init(&session->sess, GNUTLS_SERVER);
 355
 356                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 357                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 358                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 359
 360                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 361                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 362                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 363
 364                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 365
 366                 Handshake(session, user);
 367         }
 368
 369         void OnStreamSocketConnect(StreamSocket* user)
 370         {
 371                 issl_session* session = &sessions[user->GetFd()];
 372
 373                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 374
 375                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 376                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 377                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 378                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 379                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 380                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 381
 382                 Handshake(session, user);
 383         }
 384
 385         void OnStreamSocketClose(StreamSocket* user)
 386         {
 387                 CloseSession(&sessions[user->GetFd()]);
 388         }
 389
 390         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 391         {
 392                 issl_session* session = &sessions[user->GetFd()];
 393
 394                 if (!session->sess)
 395                 {
 396                         CloseSession(session);
 397                         user->SetError("No SSL session");
 398                         return -1;
 399                 }
 400
 401                 if (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE)
 402                 {
 403                         // The handshake isn't finished, try to finish it.
 404
 405                         if(!Handshake(session, user))
 406                         {
 407                                 if (session->status != ISSL_CLOSING)
 408                                         return 0;
 409                                 return -1;
 410                         }
 411                 }
 412
 413                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 414
 415                 if (session->status == ISSL_HANDSHAKEN)
 416                 {
 417                         char* buffer = ServerInstance->GetReadBuffer();
 418                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 419                         int ret = gnutls_record_recv(session->sess, buffer, bufsiz);
 420                         if (ret > 0)
 421                         {
 422                                 recvq.append(buffer, ret);
 423                                 return 1;
 424                         }
 425                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 426                         {
 427                                 return 0;
 428                         }
 429                         else if (ret == 0)
 430                         {
 431                                 user->SetError("SSL Connection closed");
 432                                 CloseSession(session);
 433                                 return -1;
 434                         }
 435                         else
 436                         {
 437                                 user->SetError(gnutls_strerror(ret));
 438                                 CloseSession(session);
 439                                 return -1;
 440                         }
 441                 }
 442                 else if (session->status == ISSL_CLOSING)
 443                         return -1;
 444
 445                 return 0;
 446         }
 447
 448         int OnStreamSocketWrite(StreamSocket* user, std::string& sendq)
 449         {
 450                 issl_session* session = &sessions[user->GetFd()];
 451
 452                 if (!session->sess)
 453                 {
 454                         CloseSession(session);
 455                         user->SetError("No SSL session");
 456                         return -1;
 457                 }
 458
 459                 if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ)
 460                 {
 461                         // The handshake isn't finished, try to finish it.
 462                         Handshake(session, user);
 463                         if (session->status != ISSL_CLOSING)
 464                                 return 0;
 465                         return -1;
 466                 }
 467
 468                 int ret = 0;
 469
 470                 if (session->status == ISSL_HANDSHAKEN)
 471                 {
 472                         ret = gnutls_record_send(session->sess, sendq.data(), sendq.length());
 473
 474                         if (ret == (int)sendq.length())
 475                         {
 476                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE);
 477                                 return 1;
 478                         }
 479                         else if (ret > 0)
 480                         {
 481                                 sendq = sendq.substr(ret);
 482                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 483                                 return 0;
 484                         }
 485                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 486                         {
 487                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 488                                 return 0;
 489                         }
 490                         else if (ret == 0)
 491                         {
 492                                 CloseSession(session);
 493                                 user->SetError("SSL Connection closed");
 494                                 return -1;
 495                         }
 496                         else // (ret < 0)
 497                         {
 498                                 user->SetError(gnutls_strerror(ret));
 499                                 CloseSession(session);
 500                                 return -1;
 501                         }
 502                 }
 503
 504                 return 0;
 505         }
 506
 507         bool Handshake(issl_session* session, StreamSocket* user)
 508         {
 509                 int ret = gnutls_handshake(session->sess);
 510
 511                 if (ret < 0)
 512                 {
 513                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 514                         {
 515                                 // Handshake needs resuming later, read() or write() would have blocked.
 516
 517                                 if(gnutls_record_get_direction(session->sess) == 0)
 518                                 {
 519                                         // gnutls_handshake() wants to read() again.
 520                                         session->status = ISSL_HANDSHAKING_READ;
 521                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 522                                 }
 523                                 else
 524                                 {
 525                                         // gnutls_handshake() wants to write() again.
 526                                         session->status = ISSL_HANDSHAKING_WRITE;
 527                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 528                                 }
 529                         }
 530                         else
 531                         {
 532                                 user->SetError(std::string("Handshake Failed - ") + gnutls_strerror(ret));
 533                                 CloseSession(session);
 534                                 session->status = ISSL_CLOSING;
 535                         }
 536
 537                         return false;
 538                 }
 539                 else
 540                 {
 541                         // Change the seesion state
 542                         session->status = ISSL_HANDSHAKEN;
 543
 544                         VerifyCertificate(session,user);
 545
 546                         // Finish writing, if any left
 547                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 548
 549                         return true;
 550                 }
 551         }
 552
 553         void OnUserConnect(LocalUser* user)
 554         {
 555                 if (user->eh.GetIOHook() == this)
 556                 {
 557                         if (sessions[user->GetFd()].sess)
 558                         {
 559                                 SSLCertSubmission(user, this, ServerInstance->Modules->Find("m_sslinfo.so"), sessions[user->GetFd()].cert);
 560                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 561                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 562                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 563                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), cipher.c_str());
 564                         }
 565                 }
 566         }
 567
 568         void CloseSession(issl_session* session)
 569         {
 570                 if (session->sess)
 571                 {
 572                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 573                         gnutls_deinit(session->sess);
 574                 }
 575                 session->sess = NULL;
 576                 session->cert = NULL;
 577                 session->status = ISSL_NONE;
 578         }
 579
 580         void VerifyCertificate(issl_session* session, StreamSocket* user)
 581         {
 582                 if (!session->sess || !user || session->cert)
 583                         return;
 584
 585                 unsigned int status;
 586                 const gnutls_datum_t* cert_list;
 587                 int ret;
 588                 unsigned int cert_list_size;
 589                 gnutls_x509_crt_t cert;
 590                 char name[MAXBUF];
 591                 unsigned char digest[MAXBUF];
 592                 size_t digest_size = sizeof(digest);
 593                 size_t name_size = sizeof(name);
 594                 ssl_cert* certinfo = new ssl_cert;
 595                 session->cert = certinfo;
 596
 597                 /* This verification function uses the trusted CAs in the credentials
 598                  * structure. So you must have installed one or more CA certificates.
 599                  */
 600                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 601
 602                 if (ret < 0)
 603                 {
 604                         certinfo->error = std::string(gnutls_strerror(ret));
 605                         return;
 606                 }
 607
 608                 certinfo->invalid = (status & GNUTLS_CERT_INVALID);
 609                 certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND);
 610                 certinfo->revoked = (status & GNUTLS_CERT_REVOKED);
 611                 certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA);
 612
 613                 /* Up to here the process is the same for X.509 certificates and
 614                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 615                  * be easily extended to work with openpgp keys as well.
 616                  */
 617                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 618                 {
 619                         certinfo->error = "No X509 keys sent";
 620                         return;
 621                 }
 622
 623                 ret = gnutls_x509_crt_init(&cert);
 624                 if (ret < 0)
 625                 {
 626                         certinfo->error = gnutls_strerror(ret);
 627                         return;
 628                 }
 629
 630                 cert_list_size = 0;
 631                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 632                 if (cert_list == NULL)
 633                 {
 634                         certinfo->error = "No certificate was found";
 635                         goto info_done_dealloc;
 636                 }
 637
 638                 /* This is not a real world example, since we only check the first
 639                  * certificate in the given chain.
 640                  */
 641
 642                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 643                 if (ret < 0)
 644                 {
 645                         certinfo->error = gnutls_strerror(ret);
 646                         goto info_done_dealloc;
 647                 }
 648
 649                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 650                 certinfo->dn = name;
 651
 652                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 653                 certinfo->issuer = name;
 654
 655                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 656                 {
 657                         certinfo->error = gnutls_strerror(ret);
 658                 }
 659                 else
 660                 {
 661                         certinfo->fingerprint = irc::hex(digest, digest_size);
 662                 }
 663
 664                 /* Beware here we do not check for errors.
 665                  */
 666                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 667                 {
 668                         certinfo->error = "Not activated, or expired certificate";
 669                 }
 670
 671 info_done_dealloc:
 672                 gnutls_x509_crt_deinit(cert);
 673         }
 674
 675         void OnEvent(Event& ev)
 676         {
 677                 capHandler.HandleEvent(ev);
 678         }
 679 };
 680
 681 MODULE_INIT(ModuleSSLGnuTLS)