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
  78 {
  79 public:
  80         gnutls_session_t sess;
  81         issl_status status;
  82         reference<ssl_cert> cert;
  83         issl_session() : sess(NULL) {}
  84 };
  85
  86 class CommandStartTLS : public SplitCommand
  87 {
  88  public:
  89         CommandStartTLS (Module* mod) : SplitCommand(mod, "STARTTLS")
  90         {
  91                 works_before_reg = true;
  92         }
  93
  94         CmdResult HandleLocal(const std::vector<std::string> &parameters, LocalUser *user)
  95         {
  96                 /* changed from == REG_ALL to catch clients sending STARTTLS
  97                  * after NICK and USER but before OnUserConnect completes and
  98                  * give a proper error message (see bug #645) - dz
  99                  */
 100                 if (user->registered != REG_NONE)
 101                 {
 102                         user->WriteNumeric(691, "%s :STARTTLS is not permitted after client registration has started", user->nick.c_str());
 103                 }
 104                 else
 105                 {
 106                         if (!user->eh.GetIOHook())
 107                         {
 108                                 user->WriteNumeric(670, "%s :STARTTLS successful, go ahead with TLS handshake", user->nick.c_str());
 109                                 user->eh.AddIOHook(creator);
 110                                 creator->OnStreamSocketAccept(&user->eh, NULL, NULL);
 111                         }
 112                         else
 113                                 user->WriteNumeric(691, "%s :STARTTLS failure", user->nick.c_str());
 114                 }
 115
 116                 return CMD_FAILURE;
 117         }
 118 };
 119
 120 class ModuleSSLGnuTLS : public Module
 121 {
 122         issl_session* sessions;
 123
 124         gnutls_certificate_credentials x509_cred;
 125         gnutls_dh_params dh_params;
 126
 127         std::string keyfile;
 128         std::string certfile;
 129
 130         std::string cafile;
 131         std::string crlfile;
 132         std::string sslports;
 133         int dh_bits;
 134
 135         bool cred_alloc;
 136
 137         CommandStartTLS starttls;
 138
 139         GenericCap capHandler;
 140  public:
 141
 142         ModuleSSLGnuTLS()
 143                 : starttls(this), capHandler(this, "tls")
 144         {
 145                 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
 146
 147                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 148
 149                 gnutls_global_init(); // This must be called once in the program
 150                 gnutls_x509_crt_init(&x509_cert);
 151                 gnutls_x509_privkey_init(&x509_key);
 152
 153                 cred_alloc = false;
 154                 // Needs the flag as it ignores a plain /rehash
 155                 OnModuleRehash(NULL,"ssl");
 156
 157                 // Void return, guess we assume success
 158                 gnutls_certificate_set_dh_params(x509_cred, dh_params);
 159                 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnUserConnect,
 160                         I_OnEvent, I_OnHookIO };
 161                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 162
 163                 ServerInstance->AddCommand(&starttls);
 164         }
 165
 166         void OnRehash(User* user)
 167         {
 168                 ConfigReader Conf;
 169
 170                 sslports.clear();
 171
 172                 for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 173                 {
 174                         ListenSocket* port = ServerInstance->ports[i];
 175                         if (port->bind_tag->getString("ssl") != "gnutls")
 176                                 continue;
 177
 178                         const std::string& portid = port->bind_desc;
 179                         ServerInstance->Logs->Log("m_ssl_gnutls", DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %s", portid.c_str());
 180
 181                         if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 182                                 sslports.append(portid).append(";");
 183                 }
 184
 185                 if (!sslports.empty())
 186                         sslports.erase(sslports.end() - 1);
 187         }
 188
 189         void OnModuleRehash(User* user, const std::string &param)
 190         {
 191                 if(param != "ssl")
 192                         return;
 193
 194                 OnRehash(user);
 195
 196                 ConfigReader Conf;
 197
 198                 cafile = Conf.ReadValue("gnutls", "cafile", 0);
 199                 crlfile = Conf.ReadValue("gnutls", "crlfile", 0);
 200                 certfile = Conf.ReadValue("gnutls", "certfile", 0);
 201                 keyfile = Conf.ReadValue("gnutls", "keyfile", 0);
 202                 dh_bits = Conf.ReadInteger("gnutls", "dhbits", 0, false);
 203
 204                 // Set all the default values needed.
 205                 if (cafile.empty())
 206                         cafile = "conf/ca.pem";
 207
 208                 if (crlfile.empty())
 209                         crlfile = "conf/crl.pem";
 210
 211                 if (certfile.empty())
 212                         certfile = "conf/cert.pem";
 213
 214                 if (keyfile.empty())
 215                         keyfile = "conf/key.pem";
 216
 217                 if((dh_bits != 768) && (dh_bits != 1024) && (dh_bits != 2048) && (dh_bits != 3072) && (dh_bits != 4096))
 218                         dh_bits = 1024;
 219
 220                 int ret;
 221
 222                 if (cred_alloc)
 223                 {
 224                         // Deallocate the old credentials
 225                         gnutls_dh_params_deinit(dh_params);
 226                         gnutls_certificate_free_credentials(x509_cred);
 227                 }
 228                 else
 229                         cred_alloc = true;
 230
 231                 if((ret = gnutls_certificate_allocate_credentials(&x509_cred)) < 0)
 232                         ServerInstance->Logs->Log("m_ssl_gnutls",DEBUG, "m_ssl_gnutls.so: Failed to allocate certificate credentials: %s", gnutls_strerror(ret));
 233
 234                 if((ret =gnutls_certificate_set_x509_trust_file(x509_cred, cafile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 235                         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));
 236
 237                 if((ret = gnutls_certificate_set_x509_crl_file (x509_cred, crlfile.c_str(), GNUTLS_X509_FMT_PEM)) < 0)
 238                         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));
 239
 240                 FileReader reader;
 241
 242                 reader.LoadFile(certfile);
 243                 std::string cert_string = reader.Contents();
 244                 gnutls_datum_t cert_datum = { (unsigned char*)cert_string.data(), cert_string.length() };
 245
 246                 reader.LoadFile(keyfile);
 247                 std::string key_string = reader.Contents();
 248                 gnutls_datum_t key_datum = { (unsigned char*)key_string.data(), key_string.length() };
 249
 250                 // If this fails, no SSL port will work. At all. So, do the smart thing - throw a ModuleException
 251                 if((ret = gnutls_x509_crt_import(x509_cert, &cert_datum, GNUTLS_X509_FMT_PEM)) < 0)
 252                         throw ModuleException("Unable to load GnuTLS server certificate (" + certfile + "): " + std::string(gnutls_strerror(ret)));
 253
 254                 if((ret = gnutls_x509_privkey_import(x509_key, &key_datum, GNUTLS_X509_FMT_PEM)) < 0)
 255                         throw ModuleException("Unable to load GnuTLS server private key (" + keyfile + "): " + std::string(gnutls_strerror(ret)));
 256
 257                 if((ret = gnutls_certificate_set_x509_key(x509_cred, &x509_cert, 1, x509_key)) < 0)
 258                         throw ModuleException("Unable to set GnuTLS cert/key pair: " + std::string(gnutls_strerror(ret)));
 259
 260                 gnutls_certificate_client_set_retrieve_function (x509_cred, cert_callback);
 261
 262                 if((ret = gnutls_dh_params_init(&dh_params)) < 0)
 263                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to initialise DH parameters: %s", gnutls_strerror(ret));
 264
 265                 // This may be on a large (once a day or week) timer eventually.
 266                 GenerateDHParams();
 267         }
 268
 269         void GenerateDHParams()
 270         {
 271                 // Generate Diffie Hellman parameters - for use with DHE
 272                 // kx algorithms. These should be discarded and regenerated
 273                 // once a day, once a week or once a month. Depending on the
 274                 // security requirements.
 275
 276                 int ret;
 277
 278                 if((ret = gnutls_dh_params_generate2(dh_params, dh_bits)) < 0)
 279                         ServerInstance->Logs->Log("m_ssl_gnutls",DEFAULT, "m_ssl_gnutls.so: Failed to generate DH parameters (%d bits): %s", dh_bits, gnutls_strerror(ret));
 280         }
 281
 282         ~ModuleSSLGnuTLS()
 283         {
 284                 gnutls_x509_crt_deinit(x509_cert);
 285                 gnutls_x509_privkey_deinit(x509_key);
 286                 gnutls_dh_params_deinit(dh_params);
 287                 gnutls_certificate_free_credentials(x509_cred);
 288                 gnutls_global_deinit();
 289                 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
 290                 delete[] sessions;
 291         }
 292
 293         void OnCleanup(int target_type, void* item)
 294         {
 295                 if(target_type == TYPE_USER)
 296                 {
 297                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
 298
 299                         if (user && user->eh.GetIOHook() == this)
 300                         {
 301                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 302                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 303                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 304                         }
 305                 }
 306         }
 307
 308         Version GetVersion()
 309         {
 310                 return Version("Provides SSL support for clients", VF_VENDOR);
 311         }
 312
 313
 314         void On005Numeric(std::string &output)
 315         {
 316                 if (!sslports.empty())
 317                         output.append(" SSL=" + sslports);
 318                 output.append(" STARTTLS");
 319         }
 320
 321         void OnHookIO(StreamSocket* user, ListenSocket* lsb)
 322         {
 323                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "gnutls")
 324                 {
 325                         /* Hook the user with our module */
 326                         user->AddIOHook(this);
 327                 }
 328         }
 329
 330         void OnRequest(Request& request)
 331         {
 332                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 333                 {
 334                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 335                         int fd = req.sock->GetFd();
 336                         issl_session* session = &sessions[fd];
 337
 338                         req.cert = session->cert;
 339                 }
 340         }
 341
 342         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 343         {
 344                 int fd = user->GetFd();
 345                 issl_session* session = &sessions[fd];
 346
 347                 /* For STARTTLS: Don't try and init a session on a socket that already has a session */
 348                 if (session->sess)
 349                         return;
 350
 351                 gnutls_init(&session->sess, GNUTLS_SERVER);
 352
 353                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 354                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 355                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 356
 357                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 358                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 359                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 360
 361                 gnutls_certificate_server_set_request(session->sess, GNUTLS_CERT_REQUEST); // Request client certificate if any.
 362
 363                 Handshake(session, user);
 364         }
 365
 366         void OnStreamSocketConnect(StreamSocket* user)
 367         {
 368                 issl_session* session = &sessions[user->GetFd()];
 369
 370                 gnutls_init(&session->sess, GNUTLS_CLIENT);
 371
 372                 gnutls_set_default_priority(session->sess); // Avoid calling all the priority functions, defaults are adequate.
 373                 gnutls_credentials_set(session->sess, GNUTLS_CRD_CERTIFICATE, x509_cred);
 374                 gnutls_dh_set_prime_bits(session->sess, dh_bits);
 375                 gnutls_transport_set_ptr(session->sess, reinterpret_cast<gnutls_transport_ptr_t>(user));
 376                 gnutls_transport_set_push_function(session->sess, gnutls_push_wrapper);
 377                 gnutls_transport_set_pull_function(session->sess, gnutls_pull_wrapper);
 378
 379                 Handshake(session, user);
 380         }
 381
 382         void OnStreamSocketClose(StreamSocket* user)
 383         {
 384                 CloseSession(&sessions[user->GetFd()]);
 385         }
 386
 387         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 388         {
 389                 issl_session* session = &sessions[user->GetFd()];
 390
 391                 if (!session->sess)
 392                 {
 393                         CloseSession(session);
 394                         user->SetError("No SSL session");
 395                         return -1;
 396                 }
 397
 398                 if (session->status == ISSL_HANDSHAKING_READ || session->status == ISSL_HANDSHAKING_WRITE)
 399                 {
 400                         // The handshake isn't finished, try to finish it.
 401
 402                         if(!Handshake(session, user))
 403                         {
 404                                 if (session->status != ISSL_CLOSING)
 405                                         return 0;
 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                         return -1;
 463                 }
 464
 465                 int ret = 0;
 466
 467                 if (session->status == ISSL_HANDSHAKEN)
 468                 {
 469                         ret = gnutls_record_send(session->sess, sendq.data(), sendq.length());
 470
 471                         if (ret == (int)sendq.length())
 472                         {
 473                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_WRITE);
 474                                 return 1;
 475                         }
 476                         else if (ret > 0)
 477                         {
 478                                 sendq = sendq.substr(ret);
 479                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 480                                 return 0;
 481                         }
 482                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 483                         {
 484                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 485                                 return 0;
 486                         }
 487                         else if (ret == 0)
 488                         {
 489                                 CloseSession(session);
 490                                 user->SetError("SSL Connection closed");
 491                                 return -1;
 492                         }
 493                         else // (ret < 0)
 494                         {
 495                                 user->SetError(gnutls_strerror(ret));
 496                                 CloseSession(session);
 497                                 return -1;
 498                         }
 499                 }
 500
 501                 return 0;
 502         }
 503
 504         bool Handshake(issl_session* session, StreamSocket* user)
 505         {
 506                 int ret = gnutls_handshake(session->sess);
 507
 508                 if (ret < 0)
 509                 {
 510                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 511                         {
 512                                 // Handshake needs resuming later, read() or write() would have blocked.
 513
 514                                 if(gnutls_record_get_direction(session->sess) == 0)
 515                                 {
 516                                         // gnutls_handshake() wants to read() again.
 517                                         session->status = ISSL_HANDSHAKING_READ;
 518                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 519                                 }
 520                                 else
 521                                 {
 522                                         // gnutls_handshake() wants to write() again.
 523                                         session->status = ISSL_HANDSHAKING_WRITE;
 524                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 525                                 }
 526                         }
 527                         else
 528                         {
 529                                 user->SetError(std::string("Handshake Failed - ") + gnutls_strerror(ret));
 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 OnUserConnect(LocalUser* user)
 551         {
 552                 if (user->eh.GetIOHook() == this)
 553                 {
 554                         if (sessions[user->GetFd()].sess)
 555                         {
 556                                 SSLCertSubmission(user, this, ServerInstance->Modules->Find("m_sslinfo.so"), sessions[user->GetFd()].cert);
 557                                 std::string cipher = gnutls_kx_get_name(gnutls_kx_get(sessions[user->GetFd()].sess));
 558                                 cipher.append("-").append(gnutls_cipher_get_name(gnutls_cipher_get(sessions[user->GetFd()].sess))).append("-");
 559                                 cipher.append(gnutls_mac_get_name(gnutls_mac_get(sessions[user->GetFd()].sess)));
 560                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), cipher.c_str());
 561                         }
 562                 }
 563         }
 564
 565         void CloseSession(issl_session* session)
 566         {
 567                 if (session->sess)
 568                 {
 569                         gnutls_bye(session->sess, GNUTLS_SHUT_WR);
 570                         gnutls_deinit(session->sess);
 571                 }
 572                 session->sess = NULL;
 573                 session->cert = NULL;
 574                 session->status = ISSL_NONE;
 575         }
 576
 577         void VerifyCertificate(issl_session* session, StreamSocket* user)
 578         {
 579                 if (!session->sess || !user || session->cert)
 580                         return;
 581
 582                 unsigned int status;
 583                 const gnutls_datum_t* cert_list;
 584                 int ret;
 585                 unsigned int cert_list_size;
 586                 gnutls_x509_crt_t cert;
 587                 char name[MAXBUF];
 588                 unsigned char digest[MAXBUF];
 589                 size_t digest_size = sizeof(digest);
 590                 size_t name_size = sizeof(name);
 591                 ssl_cert* certinfo = new ssl_cert;
 592                 session->cert = certinfo;
 593
 594                 /* This verification function uses the trusted CAs in the credentials
 595                  * structure. So you must have installed one or more CA certificates.
 596                  */
 597                 ret = gnutls_certificate_verify_peers2(session->sess, &status);
 598
 599                 if (ret < 0)
 600                 {
 601                         certinfo->error = std::string(gnutls_strerror(ret));
 602                         return;
 603                 }
 604
 605                 certinfo->invalid = (status & GNUTLS_CERT_INVALID);
 606                 certinfo->unknownsigner = (status & GNUTLS_CERT_SIGNER_NOT_FOUND);
 607                 certinfo->revoked = (status & GNUTLS_CERT_REVOKED);
 608                 certinfo->trusted = !(status & GNUTLS_CERT_SIGNER_NOT_CA);
 609
 610                 /* Up to here the process is the same for X.509 certificates and
 611                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 612                  * be easily extended to work with openpgp keys as well.
 613                  */
 614                 if (gnutls_certificate_type_get(session->sess) != GNUTLS_CRT_X509)
 615                 {
 616                         certinfo->error = "No X509 keys sent";
 617                         return;
 618                 }
 619
 620                 ret = gnutls_x509_crt_init(&cert);
 621                 if (ret < 0)
 622                 {
 623                         certinfo->error = gnutls_strerror(ret);
 624                         return;
 625                 }
 626
 627                 cert_list_size = 0;
 628                 cert_list = gnutls_certificate_get_peers(session->sess, &cert_list_size);
 629                 if (cert_list == NULL)
 630                 {
 631                         certinfo->error = "No certificate was found";
 632                         goto info_done_dealloc;
 633                 }
 634
 635                 /* This is not a real world example, since we only check the first
 636                  * certificate in the given chain.
 637                  */
 638
 639                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 640                 if (ret < 0)
 641                 {
 642                         certinfo->error = gnutls_strerror(ret);
 643                         goto info_done_dealloc;
 644                 }
 645
 646                 gnutls_x509_crt_get_dn(cert, name, &name_size);
 647                 certinfo->dn = name;
 648
 649                 gnutls_x509_crt_get_issuer_dn(cert, name, &name_size);
 650                 certinfo->issuer = name;
 651
 652                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_MD5, digest, &digest_size)) < 0)
 653                 {
 654                         certinfo->error = gnutls_strerror(ret);
 655                 }
 656                 else
 657                 {
 658                         certinfo->fingerprint = irc::hex(digest, digest_size);
 659                 }
 660
 661                 /* Beware here we do not check for errors.
 662                  */
 663                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 664                 {
 665                         certinfo->error = "Not activated, or expired certificate";
 666                 }
 667
 668 info_done_dealloc:
 669                 gnutls_x509_crt_deinit(cert);
 670         }
 671
 672         void OnEvent(Event& ev)
 673         {
 674                 capHandler.HandleEvent(ev);
 675         }
 676 };
 677
 678 MODULE_INIT(ModuleSSLGnuTLS)