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                 ConfigReader Conf;
 172
 173                 sslports.clear();
 174
 175                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 176                 {
 177                         ListenSocket* port = ServerInstance->ports[i];
 178                         if (port->bind_tag->getString("ssl") != "gnutls")
 179                                 continue;
 180
 181                         const std::string& portid = port->bind_desc;
 182                         ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
 183
 184                         if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 185                                 sslports.append(portid).append(";");
 186                 }
 187
 188                 if (!sslports.empty())
 189                         sslports.erase(sslports.end() - 1);
 190         }
 191
 192         void OnModuleRehash(User* user, const std::string &param)
 193         {
 194                 if(param != "ssl")
 195                         return;
 196
 197                 OnRehash(user);
 198
 199                 ConfigReader Conf;
 200
 201                 cafile = Conf.ReadValue("gnutls", "cafile", 0);
 202                 crlfile = Conf.ReadValue("gnutls", "crlfile", 0);
 203                 certfile = Conf.ReadValue("gnutls", "certfile", 0);
 204                 keyfile = Conf.ReadValue("gnutls", "keyfile", 0);
 205                 dh_bits = Conf.ReadInteger("gnutls", "dhbits", 0, false);
 206
 207                 // Set all the default values needed.
 208                 if (cafile.empty())
 209                         cafile = "conf/ca.pem";
 210
 211                 if (crlfile.empty())
 212                         crlfile = "conf/crl.pem";
 213
 214                 if (certfile.empty())
 215                         certfile = "conf/cert.pem";
 216
 217                 if (keyfile.empty())
 218                         keyfile = "conf/key.pem";
 219
 220                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 221                         dh_bits = 1024;
 222
 223                 int ret;
 224
 225                 if (cred_alloc)
 226                 {
 227                         // Deallocate the old credentials
 228                         gnutls_dh_params_deinit(dh_params);
 229                         gnutls_certificate_free_credentials(x509_cred);
 230                 }
 231                 else
 232                         cred_alloc = true;
 233
 234                 if((ret = gnutls_certificate_allocate_credentials(&x509_cred)) < 0)
 235                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
 236
 237                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 238                         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));
 239
 240                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 241                         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));
 242
 243                 FileReader reader;
 244
 245                 reader.LoadFile(certfile);
 246                 std::string cert_string = reader.Contents();
 247                 gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), cert_string.length() };
 248
 249                 reader.LoadFile(keyfile);
 250                 std::string key_string = reader.Contents();
 251                 gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), key_string.length() };
 252
 253                 // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
 254                 if((ret = gnutls_x509_crt_import(x509_cert, &cert_datum, GNUTLS_X509_FMT_PEM)) < 0)
 255                         throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + std::string(gnutls_strerror(ret)));
 256
 257                 if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0)
 258                         throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret)));
 259
 260                 if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_cert, 1, x509_key)) < 0)
 261                         throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret)));
 262
 263                 gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback);
 264
 265                 if((ret = gnutls_dh_params_init(&dh_params)) < 0)
 266                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
 267
 268                 // This may be on a large (once a day or week) timer eventually.
 269                 GenerateDHParams();
 270         }
 271
 272         void GenerateDHParams()
 273         {
 274                 // Generate Diffie Hellman parameters - for use with DHE
 275                 // kx algorithms. These should be discarded and regenerated
 276                 // once a day, once a week or once a month. Depending on the
 277                 // security requirements.
 278
 279                 int ret;
 280
 281                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 282                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 283         }
 284
 285         ~ModuleSSLGnuTLS()
 286         {
 287                 gnutls_x509_crt_deinit(x509_cert);
 288                 gnutls_x509_privkey_deinit(x509_key);
 289                 if (cred_alloc)
 290                 {
 291                         gnutls_dh_params_deinit(dh_params);
 292                         gnutls_certificate_free_credentials(x509_cred);
 293                 }
 294                 gnutls_global_deinit();
 295                 delete[] sessions;
 296         }
 297
 298         void OnCleanup(int target_type, void* item)
 299         {
 300                 if(target_type == TYPE_USER)
 301                 {
 302                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
 303
 304                         if (user && user->eh.GetIOHook() == this)
 305                         {
 306                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 307                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 308                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 309                         }
 310                 }
 311         }
 312
 313         Version GetVersion()
 314         {
 315                 return Version("Provides SSL support for clients", VF_VENDOR);
 316         }
 317
 318
 319         void On005Numeric(std::string &output)
 320         {
 321                 if (!sslports.empty())
 322                         output.append(" SSL=" + sslports);
 323                 output.append(" STARTTLS");
 324         }
 325
 326         void OnHookIO(StreamSocket* user, ListenSocket* lsb)
 327         {
 328                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "gnutls")
 329                 {
 330                         /* Hook the user with our module */
 331                         user->AddIOHook(this);
 332                 }
 333         }
 334
 335         void OnRequest(Request& request)
 336         {
 337                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 338                 {
 339                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 340                         int fd = req.sock->GetFd();
 341                         issl_session* session = &sessions[fd];
 342
 343                         req.cert = session->cert;
 344                 }
 345         }
 346
 347         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 348         {
 349                 int fd = user->GetFd();
 350                 issl_session* session = &sessions[fd];
 351
 352                 /* For STARTTLS: Don't try and init a session on a socket that already has a session */
 353                 if (session->sess)
 354                         return;
 355
 356                 gnutls_init(&session->sess, GNUTLS_SERVER);
 357
 358                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 359                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 360                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 361
 362                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 363                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 364                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 365
 366                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 367
 368                 Handshake(session, user);
 369         }
 370
 371         void OnStreamSocketConnect(StreamSocket* user)
 372         {
 373                 issl_session* session = &sessions[user->GetFd()];
 374
 375                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 376
 377                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 378                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 379                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 380                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 381                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 382                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 383
 384                 Handshake(session, user);
 385         }
 386
 387         void OnStreamSocketClose(StreamSocket* user)
 388         {
 389                 CloseSession(&sessions[user->GetFd()]);
 390         }
 391
 392         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 393         {
 394                 issl_session* session = &sessions[user->GetFd()];
 395
 396                 if (!session->sess)
 397                 {
 398                         CloseSession(session);
 399                         user->SetError("No SSL session");
 400                         return -1;
 401                 }
 402
 403                 if (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE)
 404                 {
 405                         // The handshake isn't finished, try to finish it.
 406
 407                         if(!Handshake(session, user))
 408                         {
 409                                 if (session->status != ISSL_CLOSING)
 410                                         return 0;
 411                                 return -1;
 412                         }
 413                 }
 414
 415                 // If we resumed the handshake then session->status will be ISSL_HANDSHAKEN.
 416
 417                 if (session->status == ISSL_HANDSHAKEN)
 418                 {
 419                         char* buffer = ServerInstance->GetReadBuffer();
 420                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 421                         int ret = gnutls_record_recv(session->sess, buffer, bufsiz);
 422                         if (ret > 0)
 423                         {
 424                                 recvq.append(buffer, ret);
 425                                 return 1;
 426                         }
 427                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 428                         {
 429                                 return 0;
 430                         }
 431                         else if (ret == 0)
 432                         {
 433                                 user->SetError("SSL Connection closed");
 434                                 CloseSession(session);
 435                                 return -1;
 436                         }
 437                         else
 438                         {
 439                                 user->SetError(gnutls_strerror(ret));
 440                                 CloseSession(session);
 441                                 return -1;
 442                         }
 443                 }
 444                 else if (session->status == ISSL_CLOSING)
 445                         return -1;
 446
 447                 return 0;
 448         }
 449
 450         int OnStreamSocketWrite(StreamSocket* user, std::string& sendq)
 451         {
 452                 issl_session* session = &sessions[user->GetFd()];
 453
 454                 if (!session->sess)
 455                 {
 456                         CloseSession(session);
 457                         user->SetError("No SSL session");
 458                         return -1;
 459                 }
 460
 461                 if (session->status == ISSL_HANDSHAKING_WRITE || session->status == ISSL_HANDSHAKING_READ)
 462                 {
 463                         // The handshake isn't finished, try to finish it.
 464                         Handshake(session, user);
 465                         if (session->status != ISSL_CLOSING)
 466                                 return 0;
 467                         return -1;
 468                 }
 469
 470                 int ret = 0;
 471
 472                 if (session->status == ISSL_HANDSHAKEN)
 473                 {
 474                         ret = gnutls_record_send(session->sess, sendq.data(), sendq.length());
 475
 476                         if (ret == (int)sendq.length())
 477                         {
 478                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE);
 479                                 return 1;
 480                         }
 481                         else if (ret > 0)
 482                         {
 483                                 sendq = sendq.substr(ret);
 484                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 485                                 return 0;
 486                         }
 487                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 488                         {
 489                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 490                                 return 0;
 491                         }
 492                         else if (ret == 0)
 493                         {
 494                                 CloseSession(session);
 495                                 user->SetError("SSL Connection closed");
 496                                 return -1;
 497                         }
 498                         else // (ret < 0)
 499                         {
 500                                 user->SetError(gnutls_strerror(ret));
 501                                 CloseSession(session);
 502                                 return -1;
 503                         }
 504                 }
 505
 506                 return 0;
 507         }
 508
 509         bool Handshake(issl_session* session, StreamSocket* user)
 510         {
 511                 int ret = gnutls_handshake(session->sess);
 512
 513                 if (ret < 0)
 514                 {
 515                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 516                         {
 517                                 // Handshake needs resuming later, read() or write() would have blocked.
 518
 519                                 if(gnutls_record_get_direction(session->sess) == 0)
 520                                 {
 521                                         // gnutls_handshake() wants to read() again.
 522                                         session->status = ISSL_HANDSHAKING_READ;
 523                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 524                                 }
 525                                 else
 526                                 {
 527                                         // gnutls_handshake() wants to write() again.
 528                                         session->status = ISSL_HANDSHAKING_WRITE;
 529                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 530                                 }
 531                         }
 532                         else
 533                         {
 534                                 user->SetError(std::string("Handshake Failed - ") + gnutls_strerror(ret));
 535                                 CloseSession(session);
 536                                 session->status = ISSL_CLOSING;
 537                         }
 538
 539                         return false;
 540                 }
 541                 else
 542                 {
 543                         // Change the seesion state
 544                         session->status = ISSL_HANDSHAKEN;
 545
 546                         VerifyCertificate(session,user);
 547
 548                         // Finish writing, if any left
 549                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 550
 551                         return true;
 552                 }
 553         }
 554
 555         void OnUserConnect(LocalUser* user)
 556         {
 557                 if (user->eh.GetIOHook() == this)
 558                 {
 559                         if (sessions[user->GetFd()].sess)
 560                         {
 561                                 SSLCertSubmission(user, this, ServerInstance->Modules->Find("m_sslinfo.so"), sessions[user->GetFd()].cert);
 562                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 563                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 564                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 565                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), cipher.c_str());
 566                         }
 567                 }
 568         }
 569
 570         void CloseSession(issl_session* session)
 571         {
 572                 if (session->sess)
 573                 {
 574                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 575                         gnutls_deinit(session->sess);
 576                 }
 577                 session->sess = NULL;
 578                 session->cert = NULL;
 579                 session->status = ISSL_NONE;
 580         }
 581
 582         void VerifyCertificate(issl_session* session, StreamSocket* user)
 583         {
 584                 if (!session->sess || !user || session->cert)
 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                 session->cert = certinfo;
 598
 599                 /* This verification function uses the trusted CAs in the credentials
 600                  * structure. So you must have installed one or more CA certificates.
 601                  */
 602                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 603
 604                 if (ret < 0)
 605                 {
 606                         certinfo->error = std::string(gnutls_strerror(ret));
 607                         return;
 608                 }
 609
 610                 certinfo->invalid = (status & GNUTLS_CERT_INVALID);
 611                 certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND);
 612                 certinfo->revoked = (status & GNUTLS_CERT_REVOKED);
 613                 certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA);
 614
 615                 /* Up to here the process is the same for X.509 certificates and
 616                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 617                  * be easily extended to work with openpgp keys as well.
 618                  */
 619                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 620                 {
 621                         certinfo->error = "No X509 keys sent";
 622                         return;
 623                 }
 624
 625                 ret = gnutls_x509_crt_init(&cert);
 626                 if (ret < 0)
 627                 {
 628                         certinfo->error = gnutls_strerror(ret);
 629                         return;
 630                 }
 631
 632                 cert_list_size = 0;
 633                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 634                 if (cert_list == NULL)
 635                 {
 636                         certinfo->error = "No certificate was found";
 637                         goto info_done_dealloc;
 638                 }
 639
 640                 /* This is not a real world example, since we only check the first
 641                  * certificate in the given chain.
 642                  */
 643
 644                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 645                 if (ret < 0)
 646                 {
 647                         certinfo->error = gnutls_strerror(ret);
 648                         goto info_done_dealloc;
 649                 }
 650
 651                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 652                 certinfo->dn = name;
 653
 654                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 655                 certinfo->issuer = name;
 656
 657                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 658                 {
 659                         certinfo->error = gnutls_strerror(ret);
 660                 }
 661                 else
 662                 {
 663                         certinfo->fingerprint = irc::hex(digest, digest_size);
 664                 }
 665
 666                 /* Beware here we do not check for errors.
 667                  */
 668                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 669                 {
 670                         certinfo->error = "Not activated, or expired certificate";
 671                 }
 672
 673 info_done_dealloc:
 674                 gnutls_x509_crt_deinit(cert);
 675         }
 676
 677         void OnEvent(Event& ev)
 678         {
 679                 capHandler.HandleEvent(ev);
 680         }
 681 };
 682
 683 MODULE_INIT(ModuleSSLGnuTLS)