src/modules/extra/m_ssl_gnutls.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 John Brooks <john.brooks@dereferenced.net>
   6  *   Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
   7  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   8  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
   9  *
  10  * This file is part of InspIRCd.  InspIRCd is free software: you can
  11  * redistribute it and/or modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation, version 2.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  16  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23
  24 #include "inspircd.h"
  25 #include "modules/ssl.h"
  26 #include <memory>
  27
  28 // Fix warnings about the use of commas at end of enumerator lists on C++03.
  29 #if defined __clang__
  30 # pragma clang diagnostic ignored "-Wc++11-extensions"
  31 #elif defined __GNUC__
  32 # pragma GCC diagnostic ignored "-pedantic"
  33 #endif
  34
  35 #include <gnutls/gnutls.h>
  36 #include <gnutls/x509.h>
  37
  38 #ifndef GNUTLS_VERSION_NUMBER
  39 #define GNUTLS_VERSION_NUMBER LIBGNUTLS_VERSION_NUMBER
  40 #define GNUTLS_VERSION LIBGNUTLS_VERSION
  41 #endif
  42
  43 // Check if the GnuTLS library is at least version major.minor.patch
  44 #define INSPIRCD_GNUTLS_HAS_VERSION(major, minor, patch) (GNUTLS_VERSION_NUMBER >= ((major << 16) | (minor << 8) | patch))
  45
  46 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 9, 8)
  47 #define GNUTLS_HAS_MAC_GET_ID
  48 #include <gnutls/crypto.h>
  49 #endif
  50
  51 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 12, 0)
  52 # define GNUTLS_HAS_RND
  53 #else
  54 # include <gcrypt.h>
  55 #endif
  56
  57 #ifdef _WIN32
  58 # pragma comment(lib, "libgnutls-28.lib")
  59 #endif
  60
  61 /* $CompileFlags: pkgconfincludes("gnutls","/gnutls/gnutls.h","") eval("print `libgcrypt-config --cflags | tr -d \r` if `pkg-config --modversion gnutls 2>/dev/null | tr -d \r` lt '2.12'") */
  62 /* $LinkerFlags: rpath("pkg-config --libs gnutls") pkgconflibs("gnutls","/libgnutls.so","-lgnutls") eval("print `libgcrypt-config --libs | tr -d \r` if `pkg-config --modversion gnutls 2>/dev/null | tr -d \r` lt '2.12'") */
  63
  64 // These don't exist in older GnuTLS versions
  65 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 1, 7)
  66 #define GNUTLS_NEW_PRIO_API
  67 #endif
  68
  69 #if (!INSPIRCD_GNUTLS_HAS_VERSION(2, 0, 0))
  70 typedef gnutls_certificate_credentials_t gnutls_certificate_credentials;
  71 typedef gnutls_dh_params_t gnutls_dh_params;
  72 #endif
  73
  74 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_HANDSHAKEN };
  75
  76 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 12, 0)
  77 #define INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
  78 #define GNUTLS_NEW_CERT_CALLBACK_API
  79 typedef gnutls_retr2_st cert_cb_last_param_type;
  80 #else
  81 typedef gnutls_retr_st cert_cb_last_param_type;
  82 #endif
  83
  84 #if INSPIRCD_GNUTLS_HAS_VERSION(3, 3, 5)
  85 #define INSPIRCD_GNUTLS_HAS_RECV_PACKET
  86 #endif
  87
  88 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 99, 0)
  89 // The second parameter of gnutls_init() has changed in 2.99.0 from gnutls_connection_end_t to unsigned int
  90 // (it became a general flags parameter) and the enum has been deprecated and generates a warning on use.
  91 typedef unsigned int inspircd_gnutls_session_init_flags_t;
  92 #else
  93 typedef gnutls_connection_end_t inspircd_gnutls_session_init_flags_t;
  94 #endif
  95
  96 #if INSPIRCD_GNUTLS_HAS_VERSION(3, 1, 9)
  97 #define INSPIRCD_GNUTLS_HAS_CORK
  98 #endif
  99
 100 class RandGen : public HandlerBase2<void, char*, size_t>
 101 {
 102  public:
 103         void Call(char* buffer, size_t len)
 104         {
 105 #ifdef GNUTLS_HAS_RND
 106                 gnutls_rnd(GNUTLS_RND_RANDOM, buffer, len);
 107 #else
 108                 gcry_randomize(buffer, len, GCRY_STRONG_RANDOM);
 109 #endif
 110         }
 111 };
 112
 113 namespace GnuTLS
 114 {
 115         class Init
 116         {
 117          public:
 118                 Init() { gnutls_global_init(); }
 119                 ~Init() { gnutls_global_deinit(); }
 120         };
 121
 122         class Exception : public ModuleException
 123         {
 124          public:
 125                 Exception(const std::string& reason)
 126                         : ModuleException(reason) { }
 127         };
 128
 129         void ThrowOnError(int errcode, const char* msg)
 130         {
 131                 if (errcode < 0)
 132                 {
 133                         std::string reason = msg;
 134                         reason.append(" :").append(gnutls_strerror(errcode));
 135                         throw Exception(reason);
 136                 }
 137         }
 138
 139         /** Used to create a gnutls_datum_t* from a std::string
 140          */
 141         class Datum
 142         {
 143                 gnutls_datum_t datum;
 144
 145          public:
 146                 Datum(const std::string& dat)
 147                 {
 148                         datum.data = (unsigned char*)dat.data();
 149                         datum.size = static_cast<unsigned int>(dat.length());
 150                 }
 151
 152                 const gnutls_datum_t* get() const { return &datum; }
 153         };
 154
 155         class Hash
 156         {
 157                 gnutls_digest_algorithm_t hash;
 158
 159          public:
 160                 // Nothing to deallocate, constructor may throw freely
 161                 Hash(const std::string& hashname)
 162                 {
 163                         // As older versions of gnutls can't do this, let's disable it where needed.
 164 #ifdef GNUTLS_HAS_MAC_GET_ID
 165                         // As gnutls_digest_algorithm_t and gnutls_mac_algorithm_t are mapped 1:1, we can do this
 166                         // There is no gnutls_dig_get_id() at the moment, but it may come later
 167                         hash = (gnutls_digest_algorithm_t)gnutls_mac_get_id(hashname.c_str());
 168                         if (hash == GNUTLS_DIG_UNKNOWN)
 169                                 throw Exception("Unknown hash type " + hashname);
 170
 171                         // Check if the user is giving us something that is a valid MAC but not digest
 172                         gnutls_hash_hd_t is_digest;
 173                         if (gnutls_hash_init(&is_digest, hash) < 0)
 174                                 throw Exception("Unknown hash type " + hashname);
 175                         gnutls_hash_deinit(is_digest, NULL);
 176 #else
 177                         if (hashname == "md5")
 178                                 hash = GNUTLS_DIG_MD5;
 179                         else if (hashname == "sha1")
 180                                 hash = GNUTLS_DIG_SHA1;
 181 #ifdef INSPIRCD_GNUTLS_ENABLE_SHA256_FINGERPRINT
 182                         else if (hashname == "sha256")
 183                                 hash = GNUTLS_DIG_SHA256;
 184 #endif
 185                         else
 186                                 throw Exception("Unknown hash type " + hashname);
 187 #endif
 188                 }
 189
 190                 gnutls_digest_algorithm_t get() const { return hash; }
 191         };
 192
 193         class DHParams
 194         {
 195                 gnutls_dh_params_t dh_params;
 196
 197                 DHParams()
 198                 {
 199                         ThrowOnError(gnutls_dh_params_init(&dh_params), "gnutls_dh_params_init() failed");
 200                 }
 201
 202          public:
 203                 /** Import */
 204                 static std::auto_ptr<DHParams> Import(const std::string& dhstr)
 205                 {
 206                         std::auto_ptr<DHParams> dh(new DHParams);
 207                         int ret = gnutls_dh_params_import_pkcs3(dh->dh_params, Datum(dhstr).get(), GNUTLS_X509_FMT_PEM);
 208                         ThrowOnError(ret, "Unable to import DH params");
 209                         return dh;
 210                 }
 211
 212                 ~DHParams()
 213                 {
 214                         gnutls_dh_params_deinit(dh_params);
 215                 }
 216
 217                 const gnutls_dh_params_t& get() const { return dh_params; }
 218         };
 219
 220         class X509Key
 221         {
 222                 /** Ensure that the key is deinited in case the constructor of X509Key throws
 223                  */
 224                 class RAIIKey
 225                 {
 226                  public:
 227                         gnutls_x509_privkey_t key;
 228
 229                         RAIIKey()
 230                         {
 231                                 ThrowOnError(gnutls_x509_privkey_init(&key), "gnutls_x509_privkey_init() failed");
 232                         }
 233
 234                         ~RAIIKey()
 235                         {
 236                                 gnutls_x509_privkey_deinit(key);
 237                         }
 238                 } key;
 239
 240          public:
 241                 /** Import */
 242                 X509Key(const std::string& keystr)
 243                 {
 244                         int ret = gnutls_x509_privkey_import(key.key, Datum(keystr).get(), GNUTLS_X509_FMT_PEM);
 245                         ThrowOnError(ret, "Unable to import private key");
 246                 }
 247
 248                 gnutls_x509_privkey_t& get() { return key.key; }
 249         };
 250
 251         class X509CertList
 252         {
 253                 std::vector<gnutls_x509_crt_t> certs;
 254
 255          public:
 256                 /** Import */
 257                 X509CertList(const std::string& certstr)
 258                 {
 259                         unsigned int certcount = 3;
 260                         certs.resize(certcount);
 261                         Datum datum(certstr);
 262
 263                         int ret = gnutls_x509_crt_list_import(raw(), &certcount, datum.get(), GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 264                         if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
 265                         {
 266                                 // the buffer wasn't big enough to hold all certs but gnutls changed certcount to the number of available certs,
 267                                 // try again with a bigger buffer
 268                                 certs.resize(certcount);
 269                                 ret = gnutls_x509_crt_list_import(raw(), &certcount, datum.get(), GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 270                         }
 271
 272                         ThrowOnError(ret, "Unable to load certificates");
 273
 274                         // Resize the vector to the actual number of certs because we rely on its size being correct
 275                         // when deallocating the certs
 276                         certs.resize(certcount);
 277                 }
 278
 279                 ~X509CertList()
 280                 {
 281                         for (std::vector<gnutls_x509_crt_t>::iterator i = certs.begin(); i != certs.end(); ++i)
 282                                 gnutls_x509_crt_deinit(*i);
 283                 }
 284
 285                 gnutls_x509_crt_t* raw() { return &certs[0]; }
 286                 unsigned int size() const { return certs.size(); }
 287         };
 288
 289         class X509CRL : public refcountbase
 290         {
 291                 class RAIICRL
 292                 {
 293                  public:
 294                         gnutls_x509_crl_t crl;
 295
 296                         RAIICRL()
 297                         {
 298                                 ThrowOnError(gnutls_x509_crl_init(&crl), "gnutls_x509_crl_init() failed");
 299                         }
 300
 301                         ~RAIICRL()
 302                         {
 303                                 gnutls_x509_crl_deinit(crl);
 304                         }
 305                 } crl;
 306
 307          public:
 308                 /** Import */
 309                 X509CRL(const std::string& crlstr)
 310                 {
 311                         int ret = gnutls_x509_crl_import(get(), Datum(crlstr).get(), GNUTLS_X509_FMT_PEM);
 312                         ThrowOnError(ret, "Unable to load certificate revocation list");
 313                 }
 314
 315                 gnutls_x509_crl_t& get() { return crl.crl; }
 316         };
 317
 318 #ifdef GNUTLS_NEW_PRIO_API
 319         class Priority
 320         {
 321                 gnutls_priority_t priority;
 322
 323          public:
 324                 Priority(const std::string& priorities)
 325                 {
 326                         // Try to set the priorities for ciphers, kex methods etc. to the user supplied string
 327                         // If the user did not supply anything then the string is already set to "NORMAL"
 328                         const char* priocstr = priorities.c_str();
 329                         const char* prioerror;
 330
 331                         int ret = gnutls_priority_init(&priority, priocstr, &prioerror);
 332                         if (ret < 0)
 333                         {
 334                                 // gnutls did not understand the user supplied string
 335                                 throw Exception("Unable to initialize priorities to \"" + priorities + "\": " + gnutls_strerror(ret) + " Syntax error at position " + ConvToStr((unsigned int) (prioerror - priocstr)));
 336                         }
 337                 }
 338
 339                 ~Priority()
 340                 {
 341                         gnutls_priority_deinit(priority);
 342                 }
 343
 344                 void SetupSession(gnutls_session_t sess)
 345                 {
 346                         gnutls_priority_set(sess, priority);
 347                 }
 348         };
 349 #else
 350         /** Dummy class, used when gnutls_priority_set() is not available
 351          */
 352         class Priority
 353         {
 354          public:
 355                 Priority(const std::string& priorities)
 356                 {
 357                         if (priorities != "NORMAL")
 358                                 throw Exception("You've set a non-default priority string, but GnuTLS lacks support for it");
 359                 }
 360
 361                 static void SetupSession(gnutls_session_t sess)
 362                 {
 363                         // Always set the default priorities
 364                         gnutls_set_default_priority(sess);
 365                 }
 366         };
 367 #endif
 368
 369         class CertCredentials
 370         {
 371                 /** DH parameters associated with these credentials
 372                  */
 373                 std::auto_ptr<DHParams> dh;
 374
 375          protected:
 376                 gnutls_certificate_credentials_t cred;
 377
 378          public:
 379                 CertCredentials()
 380                 {
 381                         ThrowOnError(gnutls_certificate_allocate_credentials(&cred), "Cannot allocate certificate credentials");
 382                 }
 383
 384                 ~CertCredentials()
 385                 {
 386                         gnutls_certificate_free_credentials(cred);
 387                 }
 388
 389                 /** Associates these credentials with the session
 390                  */
 391                 void SetupSession(gnutls_session_t sess)
 392                 {
 393                         gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, cred);
 394                 }
 395
 396                 /** Set the given DH parameters to be used with these credentials
 397                  */
 398                 void SetDH(std::auto_ptr<DHParams>& DH)
 399                 {
 400                         dh = DH;
 401                         gnutls_certificate_set_dh_params(cred, dh->get());
 402                 }
 403         };
 404
 405         class X509Credentials : public CertCredentials
 406         {
 407                 /** Private key
 408                  */
 409                 X509Key key;
 410
 411                 /** Certificate list, presented to the peer
 412                  */
 413                 X509CertList certs;
 414
 415                 /** Trusted CA, may be NULL
 416                  */
 417                 std::auto_ptr<X509CertList> trustedca;
 418
 419                 /** Certificate revocation list, may be NULL
 420                  */
 421                 std::auto_ptr<X509CRL> crl;
 422
 423                 static int cert_callback(gnutls_session_t session, const gnutls_datum_t* req_ca_rdn, int nreqs, const gnutls_pk_algorithm_t* sign_algos, int sign_algos_length, cert_cb_last_param_type* st);
 424
 425          public:
 426                 X509Credentials(const std::string& certstr, const std::string& keystr)
 427                         : key(keystr)
 428                         , certs(certstr)
 429                 {
 430                         // Throwing is ok here, the destructor of Credentials is called in that case
 431                         int ret = gnutls_certificate_set_x509_key(cred, certs.raw(), certs.size(), key.get());
 432                         ThrowOnError(ret, "Unable to set cert/key pair");
 433
 434 #ifdef GNUTLS_NEW_CERT_CALLBACK_API
 435                         gnutls_certificate_set_retrieve_function(cred, cert_callback);
 436 #else
 437                         gnutls_certificate_client_set_retrieve_function(cred, cert_callback);
 438 #endif
 439                 }
 440
 441                 /** Sets the trusted CA and the certificate revocation list
 442                  * to use when verifying certificates
 443                  */
 444                 void SetCA(std::auto_ptr<X509CertList>& certlist, std::auto_ptr<X509CRL>& CRL)
 445                 {
 446                         // Do nothing if certlist is NULL
 447                         if (certlist.get())
 448                         {
 449                                 int ret = gnutls_certificate_set_x509_trust(cred, certlist->raw(), certlist->size());
 450                                 ThrowOnError(ret, "gnutls_certificate_set_x509_trust() failed");
 451
 452                                 if (CRL.get())
 453                                 {
 454                                         ret = gnutls_certificate_set_x509_crl(cred, &CRL->get(), 1);
 455                                         ThrowOnError(ret, "gnutls_certificate_set_x509_crl() failed");
 456                                 }
 457
 458                                 trustedca = certlist;
 459                                 crl = CRL;
 460                         }
 461                 }
 462         };
 463
 464         class DataReader
 465         {
 466                 int retval;
 467 #ifdef INSPIRCD_GNUTLS_HAS_RECV_PACKET
 468                 gnutls_packet_t packet;
 469
 470          public:
 471                 DataReader(gnutls_session_t sess)
 472                 {
 473                         // Using the packet API avoids the final copy of the data which GnuTLS does if we supply
 474                         // our own buffer. Instead, we get the buffer containing the data from GnuTLS and copy it
 475                         // to the recvq directly from there in appendto().
 476                         retval = gnutls_record_recv_packet(sess, &packet);
 477                 }
 478
 479                 void appendto(std::string& recvq)
 480                 {
 481                         // Copy data from GnuTLS buffers to recvq
 482                         gnutls_datum_t datum;
 483                         gnutls_packet_get(packet, &datum, NULL);
 484                         recvq.append(reinterpret_cast<const char*>(datum.data), datum.size);
 485
 486                         gnutls_packet_deinit(packet);
 487                 }
 488 #else
 489                 char* const buffer;
 490
 491          public:
 492                 DataReader(gnutls_session_t sess)
 493                         : buffer(ServerInstance->GetReadBuffer())
 494                 {
 495                         // Read data from GnuTLS buffers into ReadBuffer
 496                         retval = gnutls_record_recv(sess, buffer, ServerInstance->Config->NetBufferSize);
 497                 }
 498
 499                 void appendto(std::string& recvq)
 500                 {
 501                         // Copy data from ReadBuffer to recvq
 502                         recvq.append(buffer, retval);
 503                 }
 504 #endif
 505
 506                 int ret() const { return retval; }
 507         };
 508
 509         class Profile : public refcountbase
 510         {
 511                 /** Name of this profile
 512                  */
 513                 const std::string name;
 514
 515                 /** X509 certificate(s) and key
 516                  */
 517                 X509Credentials x509cred;
 518
 519                 /** The minimum length in bits for the DH prime to be accepted as a client
 520                  */
 521                 unsigned int min_dh_bits;
 522
 523                 /** Hashing algorithm to use when generating certificate fingerprints
 524                  */
 525                 Hash hash;
 526
 527                 /** Priorities for ciphers, compression methods, etc.
 528                  */
 529                 Priority priority;
 530
 531                 /** Rough max size of records to send
 532                  */
 533                 const unsigned int outrecsize;
 534
 535                 Profile(const std::string& profilename, const std::string& certstr, const std::string& keystr,
 536                                 std::auto_ptr<DHParams>& DH, unsigned int mindh, const std::string& hashstr,
 537                                 const std::string& priostr, std::auto_ptr<X509CertList>& CA, std::auto_ptr<X509CRL>& CRL,
 538                                 unsigned int recsize)
 539                         : name(profilename)
 540                         , x509cred(certstr, keystr)
 541                         , min_dh_bits(mindh)
 542                         , hash(hashstr)
 543                         , priority(priostr)
 544                         , outrecsize(recsize)
 545                 {
 546                         x509cred.SetDH(DH);
 547                         x509cred.SetCA(CA, CRL);
 548                 }
 549
 550                 static std::string ReadFile(const std::string& filename)
 551                 {
 552                         FileReader reader(filename);
 553                         std::string ret = reader.GetString();
 554                         if (ret.empty())
 555                                 throw Exception("Cannot read file " + filename);
 556                         return ret;
 557                 }
 558
 559          public:
 560                 static reference<Profile> Create(const std::string& profilename, ConfigTag* tag)
 561                 {
 562                         std::string certstr = ReadFile(tag->getString("certfile", "cert.pem"));
 563                         std::string keystr = ReadFile(tag->getString("keyfile", "key.pem"));
 564
 565                         std::auto_ptr<DHParams> dh = DHParams::Import(ReadFile(tag->getString("dhfile", "dhparams.pem")));
 566
 567                         // Use default priority string if this tag does not specify one
 568                         std::string priostr = tag->getString("priority", "NORMAL");
 569                         unsigned int mindh = tag->getInt("mindhbits", 1024);
 570                         std::string hashstr = tag->getString("hash", "md5");
 571
 572                         // Load trusted CA and revocation list, if set
 573                         std::auto_ptr<X509CertList> ca;
 574                         std::auto_ptr<X509CRL> crl;
 575                         std::string filename = tag->getString("cafile");
 576                         if (!filename.empty())
 577                         {
 578                                 ca.reset(new X509CertList(ReadFile(filename)));
 579
 580                                 filename = tag->getString("crlfile");
 581                                 if (!filename.empty())
 582                                         crl.reset(new X509CRL(ReadFile(filename)));
 583                         }
 584
 585 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 586                         // If cork support is available outrecsize represents the (rough) max amount of data we give GnuTLS while corked
 587                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512);
 588 #else
 589                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512, 16384);
 590 #endif
 591                         return new Profile(profilename, certstr, keystr, dh, mindh, hashstr, priostr, ca, crl, outrecsize);
 592                 }
 593
 594                 /** Set up the given session with the settings in this profile
 595                  */
 596                 void SetupSession(gnutls_session_t sess)
 597                 {
 598                         priority.SetupSession(sess);
 599                         x509cred.SetupSession(sess);
 600                         gnutls_dh_set_prime_bits(sess, min_dh_bits);
 601
 602                         // Request client certificate if we are a server, no-op if we're a client
 603                         gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
 604                 }
 605
 606                 const std::string& GetName() const { return name; }
 607                 X509Credentials& GetX509Credentials() { return x509cred; }
 608                 gnutls_digest_algorithm_t GetHash() const { return hash.get(); }
 609                 unsigned int GetOutgoingRecordSize() const { return outrecsize; }
 610         };
 611 }
 612
 613 class GnuTLSIOHook : public SSLIOHook
 614 {
 615  private:
 616         gnutls_session_t sess;
 617         issl_status status;
 618         reference<GnuTLS::Profile> profile;
 619 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 620         size_t gbuffersize;
 621 #endif
 622
 623         void CloseSession()
 624         {
 625                 if (this->sess)
 626                 {
 627                         gnutls_bye(this->sess, GNUTLS_SHUT_WR);
 628                         gnutls_deinit(this->sess);
 629                 }
 630                 sess = NULL;
 631                 certificate = NULL;
 632                 status = ISSL_NONE;
 633         }
 634
 635         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 636         int Handshake(StreamSocket* user)
 637         {
 638                 int ret = gnutls_handshake(this->sess);
 639
 640                 if (ret < 0)
 641                 {
 642                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 643                         {
 644                                 // Handshake needs resuming later, read() or write() would have blocked.
 645                                 this->status = ISSL_HANDSHAKING;
 646
 647                                 if (gnutls_record_get_direction(this->sess) == 0)
 648                                 {
 649                                         // gnutls_handshake() wants to read() again.
 650                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 651                                 }
 652                                 else
 653                                 {
 654                                         // gnutls_handshake() wants to write() again.
 655                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 656                                 }
 657
 658                                 return 0;
 659                         }
 660                         else
 661                         {
 662                                 user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret)));
 663                                 CloseSession();
 664                                 return -1;
 665                         }
 666                 }
 667                 else
 668                 {
 669                         // Change the seesion state
 670                         this->status = ISSL_HANDSHAKEN;
 671
 672                         VerifyCertificate();
 673
 674                         // Finish writing, if any left
 675                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 676
 677                         return 1;
 678                 }
 679         }
 680
 681         void VerifyCertificate()
 682         {
 683                 unsigned int certstatus;
 684                 const gnutls_datum_t* cert_list;
 685                 int ret;
 686                 unsigned int cert_list_size;
 687                 gnutls_x509_crt_t cert;
 688                 char str[512];
 689                 unsigned char digest[512];
 690                 size_t digest_size = sizeof(digest);
 691                 size_t name_size = sizeof(str);
 692                 ssl_cert* certinfo = new ssl_cert;
 693                 this->certificate = certinfo;
 694
 695                 /* This verification function uses the trusted CAs in the credentials
 696                  * structure. So you must have installed one or more CA certificates.
 697                  */
 698                 ret = gnutls_certificate_verify_peers2(this->sess, &certstatus);
 699
 700                 if (ret < 0)
 701                 {
 702                         certinfo->error = std::string(gnutls_strerror(ret));
 703                         return;
 704                 }
 705
 706                 certinfo->invalid = (certstatus & GNUTLS_CERT_INVALID);
 707                 certinfo->unknownsigner = (certstatus & GNUTLS_CERT_SIGNER_NOT_FOUND);
 708                 certinfo->revoked = (certstatus & GNUTLS_CERT_REVOKED);
 709                 certinfo->trusted = !(certstatus & GNUTLS_CERT_SIGNER_NOT_CA);
 710
 711                 /* Up to here the process is the same for X.509 certificates and
 712                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 713                  * be easily extended to work with openpgp keys as well.
 714                  */
 715                 if (gnutls_certificate_type_get(this->sess) != GNUTLS_CRT_X509)
 716                 {
 717                         certinfo->error = "No X509 keys sent";
 718                         return;
 719                 }
 720
 721                 ret = gnutls_x509_crt_init(&cert);
 722                 if (ret < 0)
 723                 {
 724                         certinfo->error = gnutls_strerror(ret);
 725                         return;
 726                 }
 727
 728                 cert_list_size = 0;
 729                 cert_list = gnutls_certificate_get_peers(this->sess, &cert_list_size);
 730                 if (cert_list == NULL)
 731                 {
 732                         certinfo->error = "No certificate was found";
 733                         goto info_done_dealloc;
 734                 }
 735
 736                 /* This is not a real world example, since we only check the first
 737                  * certificate in the given chain.
 738                  */
 739
 740                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 741                 if (ret < 0)
 742                 {
 743                         certinfo->error = gnutls_strerror(ret);
 744                         goto info_done_dealloc;
 745                 }
 746
 747                 if (gnutls_x509_crt_get_dn(cert, str, &name_size) == 0)
 748                 {
 749                         std::string& dn = certinfo->dn;
 750                         dn = str;
 751                         // Make sure there are no chars in the string that we consider invalid
 752                         if (dn.find_first_of("\r\n") != std::string::npos)
 753                                 dn.clear();
 754                 }
 755
 756                 name_size = sizeof(str);
 757                 if (gnutls_x509_crt_get_issuer_dn(cert, str, &name_size) == 0)
 758                 {
 759                         std::string& issuer = certinfo->issuer;
 760                         issuer = str;
 761                         if (issuer.find_first_of("\r\n") != std::string::npos)
 762                                 issuer.clear();
 763                 }
 764
 765                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, profile->GetHash(), digest, &digest_size)) < 0)
 766                 {
 767                         certinfo->error = gnutls_strerror(ret);
 768                 }
 769                 else
 770                 {
 771                         certinfo->fingerprint = BinToHex(digest, digest_size);
 772                 }
 773
 774                 /* Beware here we do not check for errors.
 775                  */
 776                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 777                 {
 778                         certinfo->error = "Not activated, or expired certificate";
 779                 }
 780
 781 info_done_dealloc:
 782                 gnutls_x509_crt_deinit(cert);
 783         }
 784
 785         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 786         int PrepareIO(StreamSocket* sock)
 787         {
 788                 if (status == ISSL_HANDSHAKEN)
 789                         return 1;
 790                 else if (status == ISSL_HANDSHAKING)
 791                 {
 792                         // The handshake isn't finished, try to finish it
 793                         return Handshake(sock);
 794                 }
 795
 796                 CloseSession();
 797                 sock->SetError("No SSL session");
 798                 return -1;
 799         }
 800
 801 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 802         int FlushBuffer(StreamSocket* sock)
 803         {
 804                 // If GnuTLS has some data buffered, write it
 805                 if (gbuffersize)
 806                         return HandleWriteRet(sock, gnutls_record_uncork(this->sess, 0));
 807                 return 1;
 808         }
 809 #endif
 810
 811         int HandleWriteRet(StreamSocket* sock, int ret)
 812         {
 813                 if (ret > 0)
 814                 {
 815 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 816                         gbuffersize -= ret;
 817                         if (gbuffersize)
 818                         {
 819                                 SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 820                                 return 0;
 821                         }
 822 #endif
 823                         return ret;
 824                 }
 825                 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
 826                 {
 827                         SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 828                         return 0;
 829                 }
 830                 else // (ret < 0)
 831                 {
 832                         sock->SetError(gnutls_strerror(ret));
 833                         CloseSession();
 834                         return -1;
 835                 }
 836         }
 837
 838         static const char* UnknownIfNULL(const char* str)
 839         {
 840                 return str ? str : "UNKNOWN";
 841         }
 842
 843         static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size)
 844         {
 845                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 846 #ifdef _WIN32
 847                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 848 #endif
 849
 850                 if (sock->GetEventMask() & FD_READ_WILL_BLOCK)
 851                 {
 852 #ifdef _WIN32
 853                         gnutls_transport_set_errno(session->sess, EAGAIN);
 854 #else
 855                         errno = EAGAIN;
 856 #endif
 857                         return -1;
 858                 }
 859
 860                 int rv = SocketEngine::Recv(sock, reinterpret_cast<char *>(buffer), size, 0);
 861
 862 #ifdef _WIN32
 863                 if (rv < 0)
 864                 {
 865                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
 866                          * and then set errno appropriately.
 867                          * The gnutls library may also have a different errno variable than us, see
 868                          * gnutls_transport_set_errno(3).
 869                          */
 870                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 871                 }
 872 #endif
 873
 874                 if (rv < (int)size)
 875                         SocketEngine::ChangeEventMask(sock, FD_READ_WILL_BLOCK);
 876                 return rv;
 877         }
 878
 879 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 880         static ssize_t VectorPush(gnutls_transport_ptr_t transportptr, const giovec_t* iov, int iovcnt)
 881         {
 882                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(transportptr);
 883 #ifdef _WIN32
 884                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 885 #endif
 886
 887                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 888                 {
 889 #ifdef _WIN32
 890                         gnutls_transport_set_errno(session->sess, EAGAIN);
 891 #else
 892                         errno = EAGAIN;
 893 #endif
 894                         return -1;
 895                 }
 896
 897                 // Cast the giovec_t to iovec not to IOVector so the correct function is called on Windows
 898                 int ret = SocketEngine::WriteV(sock, reinterpret_cast<const iovec*>(iov), iovcnt);
 899 #ifdef _WIN32
 900                 // See the function above for more info about the usage of gnutls_transport_set_errno() on Windows
 901                 if (ret < 0)
 902                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 903 #endif
 904
 905                 int size = 0;
 906                 for (int i = 0; i < iovcnt; i++)
 907                         size += iov[i].iov_len;
 908
 909                 if (ret < size)
 910                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
 911                 return ret;
 912         }
 913
 914 #else // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 915         static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size)
 916         {
 917                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 918 #ifdef _WIN32
 919                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 920 #endif
 921
 922                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 923                 {
 924 #ifdef _WIN32
 925                         gnutls_transport_set_errno(session->sess, EAGAIN);
 926 #else
 927                         errno = EAGAIN;
 928 #endif
 929                         return -1;
 930                 }
 931
 932                 int rv = SocketEngine::Send(sock, reinterpret_cast<const char *>(buffer), size, 0);
 933
 934 #ifdef _WIN32
 935                 if (rv < 0)
 936                 {
 937                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
 938                          * and then set errno appropriately.
 939                          * The gnutls library may also have a different errno variable than us, see
 940                          * gnutls_transport_set_errno(3).
 941                          */
 942                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 943                 }
 944 #endif
 945
 946                 if (rv < (int)size)
 947                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
 948                 return rv;
 949         }
 950 #endif // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 951
 952  public:
 953         GnuTLSIOHook(IOHookProvider* hookprov, StreamSocket* sock, inspircd_gnutls_session_init_flags_t flags, const reference<GnuTLS::Profile>& sslprofile)
 954                 : SSLIOHook(hookprov)
 955                 , sess(NULL)
 956                 , status(ISSL_NONE)
 957                 , profile(sslprofile)
 958 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 959                 , gbuffersize(0)
 960 #endif
 961         {
 962                 gnutls_init(&sess, flags);
 963                 gnutls_transport_set_ptr(sess, reinterpret_cast<gnutls_transport_ptr_t>(sock));
 964 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 965                 gnutls_transport_set_vec_push_function(sess, VectorPush);
 966 #else
 967                 gnutls_transport_set_push_function(sess, gnutls_push_wrapper);
 968 #endif
 969                 gnutls_transport_set_pull_function(sess, gnutls_pull_wrapper);
 970                 profile->SetupSession(sess);
 971
 972                 sock->AddIOHook(this);
 973                 Handshake(sock);
 974         }
 975
 976         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
 977         {
 978                 CloseSession();
 979         }
 980
 981         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
 982         {
 983                 // Finish handshake if needed
 984                 int prepret = PrepareIO(user);
 985                 if (prepret <= 0)
 986                         return prepret;
 987
 988                 // If we resumed the handshake then this->status will be ISSL_HANDSHAKEN.
 989                 {
 990                         GnuTLS::DataReader reader(sess);
 991                         int ret = reader.ret();
 992                         if (ret > 0)
 993                         {
 994                                 reader.appendto(recvq);
 995                                 return 1;
 996                         }
 997                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 998                         {
 999                                 return 0;
1000                         }
1001                         else if (ret == 0)
1002                         {
1003                                 user->SetError("Connection closed");
1004                                 CloseSession();
1005                                 return -1;
1006                         }
1007                         else
1008                         {
1009                                 user->SetError(gnutls_strerror(ret));
1010                                 CloseSession();
1011                                 return -1;
1012                         }
1013                 }
1014         }
1015
1016         int OnStreamSocketWrite(StreamSocket* user) CXX11_OVERRIDE
1017         {
1018                 // Finish handshake if needed
1019                 int prepret = PrepareIO(user);
1020                 if (prepret <= 0)
1021                         return prepret;
1022
1023                 // Session is ready for transferring application data
1024                 StreamSocket::SendQueue& sendq = user->GetSendQ();
1025
1026 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1027                 while (true)
1028                 {
1029                         // If there is something in the GnuTLS buffer try to send() it
1030                         int ret = FlushBuffer(user);
1031                         if (ret <= 0)
1032                                 return ret; // Couldn't flush entire buffer, retry later (or close on error)
1033
1034                         // GnuTLS buffer is empty, if the sendq is empty as well then break to set FD_WANT_NO_WRITE
1035                         if (sendq.empty())
1036                                 break;
1037
1038                         // GnuTLS buffer is empty but sendq is not, begin sending data from the sendq
1039                         gnutls_record_cork(this->sess);
1040                         while ((!sendq.empty()) && (gbuffersize < profile->GetOutgoingRecordSize()))
1041                         {
1042                                 const StreamSocket::SendQueue::Element& elem = sendq.front();
1043                                 gbuffersize += elem.length();
1044                                 ret = gnutls_record_send(this->sess, elem.data(), elem.length());
1045                                 if (ret < 0)
1046                                 {
1047                                         CloseSession();
1048                                         return -1;
1049                                 }
1050                                 sendq.pop_front();
1051                         }
1052                 }
1053 #else
1054                 int ret = 0;
1055
1056                 while (!sendq.empty())
1057                 {
1058                         FlattenSendQueue(sendq, profile->GetOutgoingRecordSize());
1059                         const StreamSocket::SendQueue::Element& buffer = sendq.front();
1060                         ret = HandleWriteRet(user, gnutls_record_send(this->sess, buffer.data(), buffer.length()));
1061
1062                         if (ret <= 0)
1063                                 return ret;
1064                         else if (ret < (int)buffer.length())
1065                         {
1066                                 sendq.erase_front(ret);
1067                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
1068                                 return 0;
1069                         }
1070
1071                         // Wrote entire record, continue sending
1072                         sendq.pop_front();
1073                 }
1074 #endif
1075
1076                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_WRITE);
1077                 return 1;
1078         }
1079
1080         void TellCiphersAndFingerprint(LocalUser* user)
1081         {
1082                 if (sess)
1083                 {
1084                         std::string text = "*** You are connected using SSL cipher '";
1085                         GetCiphersuite(text);
1086                         text += '\'';
1087                         if (!certificate->fingerprint.empty())
1088                                 text += " and your SSL certificate fingerprint is " + certificate->fingerprint;
1089
1090                         user->WriteNotice(text);
1091                 }
1092         }
1093
1094         void GetCiphersuite(std::string& out) const
1095         {
1096                 out.append(UnknownIfNULL(gnutls_protocol_get_name(gnutls_protocol_get_version(sess)))).push_back('-');
1097                 out.append(UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess)))).push_back('-');
1098                 out.append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).push_back('-');
1099                 out.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess))));
1100         }
1101
1102         GnuTLS::Profile* GetProfile() { return profile; }
1103         bool IsHandshakeDone() const { return (status == ISSL_HANDSHAKEN); }
1104 };
1105
1106 int GnuTLS::X509Credentials::cert_callback(gnutls_session_t sess, const gnutls_datum_t* req_ca_rdn, int nreqs, const gnutls_pk_algorithm_t* sign_algos, int sign_algos_length, cert_cb_last_param_type* st)
1107 {
1108 #ifndef GNUTLS_NEW_CERT_CALLBACK_API
1109         st->type = GNUTLS_CRT_X509;
1110 #else
1111         st->cert_type = GNUTLS_CRT_X509;
1112         st->key_type = GNUTLS_PRIVKEY_X509;
1113 #endif
1114         StreamSocket* sock = reinterpret_cast<StreamSocket*>(gnutls_transport_get_ptr(sess));
1115         GnuTLS::X509Credentials& cred = static_cast<GnuTLSIOHook*>(sock->GetIOHook())->GetProfile()->GetX509Credentials();
1116
1117         st->ncerts = cred.certs.size();
1118         st->cert.x509 = cred.certs.raw();
1119         st->key.x509 = cred.key.get();
1120         st->deinit_all = 0;
1121
1122         return 0;
1123 }
1124
1125 class GnuTLSIOHookProvider : public refcountbase, public IOHookProvider
1126 {
1127         reference<GnuTLS::Profile> profile;
1128
1129  public:
1130         GnuTLSIOHookProvider(Module* mod, reference<GnuTLS::Profile>& prof)
1131                 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
1132                 , profile(prof)
1133         {
1134                 ServerInstance->Modules->AddService(*this);
1135         }
1136
1137         ~GnuTLSIOHookProvider()
1138         {
1139                 ServerInstance->Modules->DelService(*this);
1140         }
1141
1142         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
1143         {
1144                 new GnuTLSIOHook(this, sock, GNUTLS_SERVER, profile);
1145         }
1146
1147         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
1148         {
1149                 new GnuTLSIOHook(this, sock, GNUTLS_CLIENT, profile);
1150         }
1151 };
1152
1153 class ModuleSSLGnuTLS : public Module
1154 {
1155         typedef std::vector<reference<GnuTLSIOHookProvider> > ProfileList;
1156
1157         // First member of the class, gets constructed first and destructed last
1158         GnuTLS::Init libinit;
1159         RandGen randhandler;
1160         ProfileList profiles;
1161
1162         void ReadProfiles()
1163         {
1164                 // First, store all profiles in a new, temporary container. If no problems occur, swap the two
1165                 // containers; this way if something goes wrong we can go back and continue using the current profiles,
1166                 // avoiding unpleasant situations where no new SSL connections are possible.
1167                 ProfileList newprofiles;
1168
1169                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
1170                 if (tags.first == tags.second)
1171                 {
1172                         // No <sslprofile> tags found, create a profile named "gnutls" from settings in the <gnutls> block
1173                         const std::string defname = "gnutls";
1174                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
1175                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found; using settings from the <gnutls> tag");
1176
1177                         try
1178                         {
1179                                 reference<GnuTLS::Profile> profile(GnuTLS::Profile::Create(defname, tag));
1180                                 newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1181                         }
1182                         catch (CoreException& ex)
1183                         {
1184                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
1185                         }
1186                 }
1187
1188                 for (ConfigIter i = tags.first; i != tags.second; ++i)
1189                 {
1190                         ConfigTag* tag = i->second;
1191                         if (tag->getString("provider") != "gnutls")
1192                                 continue;
1193
1194                         std::string name = tag->getString("name");
1195                         if (name.empty())
1196                         {
1197                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
1198                                 continue;
1199                         }
1200
1201                         reference<GnuTLS::Profile> profile;
1202                         try
1203                         {
1204                                 profile = GnuTLS::Profile::Create(name, tag);
1205                         }
1206                         catch (CoreException& ex)
1207                         {
1208                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
1209                         }
1210
1211                         newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1212                 }
1213
1214                 // New profiles are ok, begin using them
1215                 // Old profiles are deleted when their refcount drops to zero
1216                 profiles.swap(newprofiles);
1217         }
1218
1219  public:
1220         ModuleSSLGnuTLS()
1221         {
1222 #ifndef GNUTLS_HAS_RND
1223                 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
1224 #endif
1225         }
1226
1227         void init() CXX11_OVERRIDE
1228         {
1229                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "GnuTLS lib version %s module was compiled for " GNUTLS_VERSION, gnutls_check_version(NULL));
1230                 ReadProfiles();
1231                 ServerInstance->GenRandom = &randhandler;
1232         }
1233
1234         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
1235         {
1236                 if(param != "ssl")
1237                         return;
1238
1239                 try
1240                 {
1241                         ReadProfiles();
1242                 }
1243                 catch (ModuleException& ex)
1244                 {
1245                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
1246                 }
1247         }
1248
1249         ~ModuleSSLGnuTLS()
1250         {
1251                 ServerInstance->GenRandom = &ServerInstance->HandleGenRandom;
1252         }
1253
1254         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
1255         {
1256                 if(target_type == TYPE_USER)
1257                 {
1258                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
1259
1260                         if (user && user->eh.GetIOHook() && user->eh.GetIOHook()->prov->creator == this)
1261                         {
1262                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
1263                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
1264                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
1265                         }
1266                 }
1267         }
1268
1269         Version GetVersion() CXX11_OVERRIDE
1270         {
1271                 return Version("Provides SSL support for clients", VF_VENDOR);
1272         }
1273
1274         void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
1275         {
1276                 IOHook* hook = user->eh.GetIOHook();
1277                 if (hook && hook->prov->creator == this)
1278                         static_cast<GnuTLSIOHook*>(hook)->TellCiphersAndFingerprint(user);
1279         }
1280
1281         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
1282         {
1283                 if ((user->eh.GetIOHook()) && (user->eh.GetIOHook()->prov->creator == this))
1284                 {
1285                         GnuTLSIOHook* iohook = static_cast<GnuTLSIOHook*>(user->eh.GetIOHook());
1286                         if (!iohook->IsHandshakeDone())
1287                                 return MOD_RES_DENY;
1288                 }
1289
1290                 return MOD_RES_PASSTHRU;
1291         }
1292 };
1293
1294 MODULE_INIT(ModuleSSLGnuTLS)