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 # if __GNUC__ < 6
  33 #  pragma GCC diagnostic ignored "-pedantic"
  34 # else
  35 #  pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  36 # endif
  37 #endif
  38
  39 #include <gnutls/gnutls.h>
  40 #include <gnutls/x509.h>
  41
  42 #ifndef GNUTLS_VERSION_NUMBER
  43 #define GNUTLS_VERSION_NUMBER LIBGNUTLS_VERSION_NUMBER
  44 #define GNUTLS_VERSION LIBGNUTLS_VERSION
  45 #endif
  46
  47 // Check if the GnuTLS library is at least version major.minor.patch
  48 #define INSPIRCD_GNUTLS_HAS_VERSION(major, minor, patch) (GNUTLS_VERSION_NUMBER >= ((major << 16) | (minor << 8) | patch))
  49
  50 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 9, 8)
  51 #define GNUTLS_HAS_MAC_GET_ID
  52 #include <gnutls/crypto.h>
  53 #endif
  54
  55 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 12, 0)
  56 # define GNUTLS_HAS_RND
  57 #else
  58 # include <gcrypt.h>
  59 #endif
  60
  61 #ifdef _WIN32
  62 # pragma comment(lib, "libgnutls-30.lib")
  63 #endif
  64
  65 /* $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'") */
  66 /* $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'") */
  67
  68 // These don't exist in older GnuTLS versions
  69 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 1, 7)
  70 #define GNUTLS_NEW_PRIO_API
  71 #endif
  72
  73 #if (!INSPIRCD_GNUTLS_HAS_VERSION(2, 0, 0))
  74 typedef gnutls_certificate_credentials_t gnutls_certificate_credentials;
  75 typedef gnutls_dh_params_t gnutls_dh_params;
  76 #endif
  77
  78 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_HANDSHAKEN };
  79
  80 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 12, 0)
  81 #define INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
  82 #define GNUTLS_NEW_CERT_CALLBACK_API
  83 typedef gnutls_retr2_st cert_cb_last_param_type;
  84 #else
  85 typedef gnutls_retr_st cert_cb_last_param_type;
  86 #endif
  87
  88 #if INSPIRCD_GNUTLS_HAS_VERSION(3, 3, 5)
  89 #define INSPIRCD_GNUTLS_HAS_RECV_PACKET
  90 #endif
  91
  92 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 99, 0)
  93 // The second parameter of gnutls_init() has changed in 2.99.0 from gnutls_connection_end_t to unsigned int
  94 // (it became a general flags parameter) and the enum has been deprecated and generates a warning on use.
  95 typedef unsigned int inspircd_gnutls_session_init_flags_t;
  96 #else
  97 typedef gnutls_connection_end_t inspircd_gnutls_session_init_flags_t;
  98 #endif
  99
 100 #if INSPIRCD_GNUTLS_HAS_VERSION(3, 1, 9)
 101 #define INSPIRCD_GNUTLS_HAS_CORK
 102 #endif
 103
 104 static Module* thismod;
 105
 106 class RandGen : public HandlerBase2<void, char*, size_t>
 107 {
 108  public:
 109         void Call(char* buffer, size_t len)
 110         {
 111 #ifdef GNUTLS_HAS_RND
 112                 gnutls_rnd(GNUTLS_RND_RANDOM, buffer, len);
 113 #else
 114                 gcry_randomize(buffer, len, GCRY_STRONG_RANDOM);
 115 #endif
 116         }
 117 };
 118
 119 namespace GnuTLS
 120 {
 121         class Init
 122         {
 123          public:
 124                 Init() { gnutls_global_init(); }
 125                 ~Init() { gnutls_global_deinit(); }
 126         };
 127
 128         class Exception : public ModuleException
 129         {
 130          public:
 131                 Exception(const std::string& reason)
 132                         : ModuleException(reason) { }
 133         };
 134
 135         void ThrowOnError(int errcode, const char* msg)
 136         {
 137                 if (errcode < 0)
 138                 {
 139                         std::string reason = msg;
 140                         reason.append(" :").append(gnutls_strerror(errcode));
 141                         throw Exception(reason);
 142                 }
 143         }
 144
 145         /** Used to create a gnutls_datum_t* from a std::string
 146          */
 147         class Datum
 148         {
 149                 gnutls_datum_t datum;
 150
 151          public:
 152                 Datum(const std::string& dat)
 153                 {
 154                         datum.data = (unsigned char*)dat.data();
 155                         datum.size = static_cast<unsigned int>(dat.length());
 156                 }
 157
 158                 const gnutls_datum_t* get() const { return &datum; }
 159         };
 160
 161         class Hash
 162         {
 163                 gnutls_digest_algorithm_t hash;
 164
 165          public:
 166                 // Nothing to deallocate, constructor may throw freely
 167                 Hash(const std::string& hashname)
 168                 {
 169                         // As older versions of gnutls can't do this, let's disable it where needed.
 170 #ifdef GNUTLS_HAS_MAC_GET_ID
 171                         // As gnutls_digest_algorithm_t and gnutls_mac_algorithm_t are mapped 1:1, we can do this
 172                         // There is no gnutls_dig_get_id() at the moment, but it may come later
 173                         hash = (gnutls_digest_algorithm_t)gnutls_mac_get_id(hashname.c_str());
 174                         if (hash == GNUTLS_DIG_UNKNOWN)
 175                                 throw Exception("Unknown hash type " + hashname);
 176
 177                         // Check if the user is giving us something that is a valid MAC but not digest
 178                         gnutls_hash_hd_t is_digest;
 179                         if (gnutls_hash_init(&is_digest, hash) < 0)
 180                                 throw Exception("Unknown hash type " + hashname);
 181                         gnutls_hash_deinit(is_digest, NULL);
 182 #else
 183                         if (hashname == "md5")
 184                                 hash = GNUTLS_DIG_MD5;
 185                         else if (hashname == "sha1")
 186                                 hash = GNUTLS_DIG_SHA1;
 187 #ifdef INSPIRCD_GNUTLS_ENABLE_SHA256_FINGERPRINT
 188                         else if (hashname == "sha256")
 189                                 hash = GNUTLS_DIG_SHA256;
 190 #endif
 191                         else
 192                                 throw Exception("Unknown hash type " + hashname);
 193 #endif
 194                 }
 195
 196                 gnutls_digest_algorithm_t get() const { return hash; }
 197         };
 198
 199         class DHParams
 200         {
 201                 gnutls_dh_params_t dh_params;
 202
 203                 DHParams()
 204                 {
 205                         ThrowOnError(gnutls_dh_params_init(&dh_params), "gnutls_dh_params_init() failed");
 206                 }
 207
 208          public:
 209                 /** Import */
 210                 static std::auto_ptr<DHParams> Import(const std::string& dhstr)
 211                 {
 212                         std::auto_ptr<DHParams> dh(new DHParams);
 213                         int ret = gnutls_dh_params_import_pkcs3(dh->dh_params, Datum(dhstr).get(), GNUTLS_X509_FMT_PEM);
 214                         ThrowOnError(ret, "Unable to import DH params");
 215                         return dh;
 216                 }
 217
 218                 ~DHParams()
 219                 {
 220                         gnutls_dh_params_deinit(dh_params);
 221                 }
 222
 223                 const gnutls_dh_params_t& get() const { return dh_params; }
 224         };
 225
 226         class X509Key
 227         {
 228                 /** Ensure that the key is deinited in case the constructor of X509Key throws
 229                  */
 230                 class RAIIKey
 231                 {
 232                  public:
 233                         gnutls_x509_privkey_t key;
 234
 235                         RAIIKey()
 236                         {
 237                                 ThrowOnError(gnutls_x509_privkey_init(&key), "gnutls_x509_privkey_init() failed");
 238                         }
 239
 240                         ~RAIIKey()
 241                         {
 242                                 gnutls_x509_privkey_deinit(key);
 243                         }
 244                 } key;
 245
 246          public:
 247                 /** Import */
 248                 X509Key(const std::string& keystr)
 249                 {
 250                         int ret = gnutls_x509_privkey_import(key.key, Datum(keystr).get(), GNUTLS_X509_FMT_PEM);
 251                         ThrowOnError(ret, "Unable to import private key");
 252                 }
 253
 254                 gnutls_x509_privkey_t& get() { return key.key; }
 255         };
 256
 257         class X509CertList
 258         {
 259                 std::vector<gnutls_x509_crt_t> certs;
 260
 261          public:
 262                 /** Import */
 263                 X509CertList(const std::string& certstr)
 264                 {
 265                         unsigned int certcount = 3;
 266                         certs.resize(certcount);
 267                         Datum datum(certstr);
 268
 269                         int ret = gnutls_x509_crt_list_import(raw(), &certcount, datum.get(), GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 270                         if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
 271                         {
 272                                 // the buffer wasn't big enough to hold all certs but gnutls changed certcount to the number of available certs,
 273                                 // try again with a bigger buffer
 274                                 certs.resize(certcount);
 275                                 ret = gnutls_x509_crt_list_import(raw(), &certcount, datum.get(), GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 276                         }
 277
 278                         ThrowOnError(ret, "Unable to load certificates");
 279
 280                         // Resize the vector to the actual number of certs because we rely on its size being correct
 281                         // when deallocating the certs
 282                         certs.resize(certcount);
 283                 }
 284
 285                 ~X509CertList()
 286                 {
 287                         for (std::vector<gnutls_x509_crt_t>::iterator i = certs.begin(); i != certs.end(); ++i)
 288                                 gnutls_x509_crt_deinit(*i);
 289                 }
 290
 291                 gnutls_x509_crt_t* raw() { return &certs[0]; }
 292                 unsigned int size() const { return certs.size(); }
 293         };
 294
 295         class X509CRL : public refcountbase
 296         {
 297                 class RAIICRL
 298                 {
 299                  public:
 300                         gnutls_x509_crl_t crl;
 301
 302                         RAIICRL()
 303                         {
 304                                 ThrowOnError(gnutls_x509_crl_init(&crl), "gnutls_x509_crl_init() failed");
 305                         }
 306
 307                         ~RAIICRL()
 308                         {
 309                                 gnutls_x509_crl_deinit(crl);
 310                         }
 311                 } crl;
 312
 313          public:
 314                 /** Import */
 315                 X509CRL(const std::string& crlstr)
 316                 {
 317                         int ret = gnutls_x509_crl_import(get(), Datum(crlstr).get(), GNUTLS_X509_FMT_PEM);
 318                         ThrowOnError(ret, "Unable to load certificate revocation list");
 319                 }
 320
 321                 gnutls_x509_crl_t& get() { return crl.crl; }
 322         };
 323
 324 #ifdef GNUTLS_NEW_PRIO_API
 325         class Priority
 326         {
 327                 gnutls_priority_t priority;
 328
 329          public:
 330                 Priority(const std::string& priorities)
 331                 {
 332                         // Try to set the priorities for ciphers, kex methods etc. to the user supplied string
 333                         // If the user did not supply anything then the string is already set to "NORMAL"
 334                         const char* priocstr = priorities.c_str();
 335                         const char* prioerror;
 336
 337                         int ret = gnutls_priority_init(&priority, priocstr, &prioerror);
 338                         if (ret < 0)
 339                         {
 340                                 // gnutls did not understand the user supplied string
 341                                 throw Exception("Unable to initialize priorities to \"" + priorities + "\": " + gnutls_strerror(ret) + " Syntax error at position " + ConvToStr((unsigned int) (prioerror - priocstr)));
 342                         }
 343                 }
 344
 345                 ~Priority()
 346                 {
 347                         gnutls_priority_deinit(priority);
 348                 }
 349
 350                 void SetupSession(gnutls_session_t sess)
 351                 {
 352                         gnutls_priority_set(sess, priority);
 353                 }
 354
 355                 static const char* GetDefault()
 356                 {
 357                         return "NORMAL:%SERVER_PRECEDENCE:-VERS-SSL3.0";
 358                 }
 359
 360                 static std::string RemoveUnknownTokens(const std::string& prio)
 361                 {
 362                         std::string ret;
 363                         irc::sepstream ss(prio, ':');
 364                         for (std::string token; ss.GetToken(token); )
 365                         {
 366                                 // Save current position so we can revert later if needed
 367                                 const std::string::size_type prevpos = ret.length();
 368                                 // Append next token
 369                                 if (!ret.empty())
 370                                         ret.push_back(':');
 371                                 ret.append(token);
 372
 373                                 gnutls_priority_t test;
 374                                 if (gnutls_priority_init(&test, ret.c_str(), NULL) < 0)
 375                                 {
 376                                         // The new token broke the priority string, revert to the previously working one
 377                                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Priority string token not recognized: \"%s\"", token.c_str());
 378                                         ret.erase(prevpos);
 379                                 }
 380                                 else
 381                                 {
 382                                         // Worked
 383                                         gnutls_priority_deinit(test);
 384                                 }
 385                         }
 386                         return ret;
 387                 }
 388         };
 389 #else
 390         /** Dummy class, used when gnutls_priority_set() is not available
 391          */
 392         class Priority
 393         {
 394          public:
 395                 Priority(const std::string& priorities)
 396                 {
 397                         if (priorities != GetDefault())
 398                                 throw Exception("You've set a non-default priority string, but GnuTLS lacks support for it");
 399                 }
 400
 401                 static void SetupSession(gnutls_session_t sess)
 402                 {
 403                         // Always set the default priorities
 404                         gnutls_set_default_priority(sess);
 405                 }
 406
 407                 static const char* GetDefault()
 408                 {
 409                         return "NORMAL";
 410                 }
 411
 412                 static std::string RemoveUnknownTokens(const std::string& prio)
 413                 {
 414                         // We don't do anything here because only NORMAL is accepted
 415                         return prio;
 416                 }
 417         };
 418 #endif
 419
 420         class CertCredentials
 421         {
 422                 /** DH parameters associated with these credentials
 423                  */
 424                 std::auto_ptr<DHParams> dh;
 425
 426          protected:
 427                 gnutls_certificate_credentials_t cred;
 428
 429          public:
 430                 CertCredentials()
 431                 {
 432                         ThrowOnError(gnutls_certificate_allocate_credentials(&cred), "Cannot allocate certificate credentials");
 433                 }
 434
 435                 ~CertCredentials()
 436                 {
 437                         gnutls_certificate_free_credentials(cred);
 438                 }
 439
 440                 /** Associates these credentials with the session
 441                  */
 442                 void SetupSession(gnutls_session_t sess)
 443                 {
 444                         gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, cred);
 445                 }
 446
 447                 /** Set the given DH parameters to be used with these credentials
 448                  */
 449                 void SetDH(std::auto_ptr<DHParams>& DH)
 450                 {
 451                         dh = DH;
 452                         gnutls_certificate_set_dh_params(cred, dh->get());
 453                 }
 454         };
 455
 456         class X509Credentials : public CertCredentials
 457         {
 458                 /** Private key
 459                  */
 460                 X509Key key;
 461
 462                 /** Certificate list, presented to the peer
 463                  */
 464                 X509CertList certs;
 465
 466                 /** Trusted CA, may be NULL
 467                  */
 468                 std::auto_ptr<X509CertList> trustedca;
 469
 470                 /** Certificate revocation list, may be NULL
 471                  */
 472                 std::auto_ptr<X509CRL> crl;
 473
 474                 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);
 475
 476          public:
 477                 X509Credentials(const std::string& certstr, const std::string& keystr)
 478                         : key(keystr)
 479                         , certs(certstr)
 480                 {
 481                         // Throwing is ok here, the destructor of Credentials is called in that case
 482                         int ret = gnutls_certificate_set_x509_key(cred, certs.raw(), certs.size(), key.get());
 483                         ThrowOnError(ret, "Unable to set cert/key pair");
 484
 485 #ifdef GNUTLS_NEW_CERT_CALLBACK_API
 486                         gnutls_certificate_set_retrieve_function(cred, cert_callback);
 487 #else
 488                         gnutls_certificate_client_set_retrieve_function(cred, cert_callback);
 489 #endif
 490                 }
 491
 492                 /** Sets the trusted CA and the certificate revocation list
 493                  * to use when verifying certificates
 494                  */
 495                 void SetCA(std::auto_ptr<X509CertList>& certlist, std::auto_ptr<X509CRL>& CRL)
 496                 {
 497                         // Do nothing if certlist is NULL
 498                         if (certlist.get())
 499                         {
 500                                 int ret = gnutls_certificate_set_x509_trust(cred, certlist->raw(), certlist->size());
 501                                 ThrowOnError(ret, "gnutls_certificate_set_x509_trust() failed");
 502
 503                                 if (CRL.get())
 504                                 {
 505                                         ret = gnutls_certificate_set_x509_crl(cred, &CRL->get(), 1);
 506                                         ThrowOnError(ret, "gnutls_certificate_set_x509_crl() failed");
 507                                 }
 508
 509                                 trustedca = certlist;
 510                                 crl = CRL;
 511                         }
 512                 }
 513         };
 514
 515         class DataReader
 516         {
 517                 int retval;
 518 #ifdef INSPIRCD_GNUTLS_HAS_RECV_PACKET
 519                 gnutls_packet_t packet;
 520
 521          public:
 522                 DataReader(gnutls_session_t sess)
 523                 {
 524                         // Using the packet API avoids the final copy of the data which GnuTLS does if we supply
 525                         // our own buffer. Instead, we get the buffer containing the data from GnuTLS and copy it
 526                         // to the recvq directly from there in appendto().
 527                         retval = gnutls_record_recv_packet(sess, &packet);
 528                 }
 529
 530                 void appendto(std::string& recvq)
 531                 {
 532                         // Copy data from GnuTLS buffers to recvq
 533                         gnutls_datum_t datum;
 534                         gnutls_packet_get(packet, &datum, NULL);
 535                         recvq.append(reinterpret_cast<const char*>(datum.data), datum.size);
 536
 537                         gnutls_packet_deinit(packet);
 538                 }
 539 #else
 540                 char* const buffer;
 541
 542          public:
 543                 DataReader(gnutls_session_t sess)
 544                         : buffer(ServerInstance->GetReadBuffer())
 545                 {
 546                         // Read data from GnuTLS buffers into ReadBuffer
 547                         retval = gnutls_record_recv(sess, buffer, ServerInstance->Config->NetBufferSize);
 548                 }
 549
 550                 void appendto(std::string& recvq)
 551                 {
 552                         // Copy data from ReadBuffer to recvq
 553                         recvq.append(buffer, retval);
 554                 }
 555 #endif
 556
 557                 int ret() const { return retval; }
 558         };
 559
 560         class Profile : public refcountbase
 561         {
 562                 /** Name of this profile
 563                  */
 564                 const std::string name;
 565
 566                 /** X509 certificate(s) and key
 567                  */
 568                 X509Credentials x509cred;
 569
 570                 /** The minimum length in bits for the DH prime to be accepted as a client
 571                  */
 572                 unsigned int min_dh_bits;
 573
 574                 /** Hashing algorithm to use when generating certificate fingerprints
 575                  */
 576                 Hash hash;
 577
 578                 /** Priorities for ciphers, compression methods, etc.
 579                  */
 580                 Priority priority;
 581
 582                 /** Rough max size of records to send
 583                  */
 584                 const unsigned int outrecsize;
 585
 586                 Profile(const std::string& profilename, const std::string& certstr, const std::string& keystr,
 587                                 std::auto_ptr<DHParams>& DH, unsigned int mindh, const std::string& hashstr,
 588                                 const std::string& priostr, std::auto_ptr<X509CertList>& CA, std::auto_ptr<X509CRL>& CRL,
 589                                 unsigned int recsize)
 590                         : name(profilename)
 591                         , x509cred(certstr, keystr)
 592                         , min_dh_bits(mindh)
 593                         , hash(hashstr)
 594                         , priority(priostr)
 595                         , outrecsize(recsize)
 596                 {
 597                         x509cred.SetDH(DH);
 598                         x509cred.SetCA(CA, CRL);
 599                 }
 600
 601                 static std::string ReadFile(const std::string& filename)
 602                 {
 603                         FileReader reader(filename);
 604                         std::string ret = reader.GetString();
 605                         if (ret.empty())
 606                                 throw Exception("Cannot read file " + filename);
 607                         return ret;
 608                 }
 609
 610                 static std::string GetPrioStr(const std::string& profilename, ConfigTag* tag)
 611                 {
 612                         // Use default priority string if this tag does not specify one
 613                         std::string priostr = GnuTLS::Priority::GetDefault();
 614                         bool found = tag->readString("priority", priostr);
 615                         // If the prio string isn't set in the config don't be strict about the default one because it doesn't work on all versions of GnuTLS
 616                         if (!tag->getBool("strictpriority", found))
 617                         {
 618                                 std::string stripped = GnuTLS::Priority::RemoveUnknownTokens(priostr);
 619                                 if (stripped.empty())
 620                                 {
 621                                         // Stripping failed, act as if a prio string wasn't set
 622                                         stripped = GnuTLS::Priority::RemoveUnknownTokens(GnuTLS::Priority::GetDefault());
 623                                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Priority string for profile \"%s\" contains unknown tokens and stripping it didn't yield a working one either, falling back to \"%s\"", profilename.c_str(), stripped.c_str());
 624                                 }
 625                                 else if ((found) && (stripped != priostr))
 626                                 {
 627                                         // Prio string was set in the config and we ended up with something that works but different
 628                                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Priority string for profile \"%s\" contains unknown tokens, stripped to \"%s\"", profilename.c_str(), stripped.c_str());
 629                                 }
 630                                 priostr.swap(stripped);
 631                         }
 632                         return priostr;
 633                 }
 634
 635          public:
 636                 static reference<Profile> Create(const std::string& profilename, ConfigTag* tag)
 637                 {
 638                         std::string certstr = ReadFile(tag->getString("certfile", "cert.pem"));
 639                         std::string keystr = ReadFile(tag->getString("keyfile", "key.pem"));
 640
 641                         std::auto_ptr<DHParams> dh = DHParams::Import(ReadFile(tag->getString("dhfile", "dhparams.pem")));
 642
 643                         std::string priostr = GetPrioStr(profilename, tag);
 644                         unsigned int mindh = tag->getInt("mindhbits", 1024);
 645                         std::string hashstr = tag->getString("hash", "md5");
 646
 647                         // Load trusted CA and revocation list, if set
 648                         std::auto_ptr<X509CertList> ca;
 649                         std::auto_ptr<X509CRL> crl;
 650                         std::string filename = tag->getString("cafile");
 651                         if (!filename.empty())
 652                         {
 653                                 ca.reset(new X509CertList(ReadFile(filename)));
 654
 655                                 filename = tag->getString("crlfile");
 656                                 if (!filename.empty())
 657                                         crl.reset(new X509CRL(ReadFile(filename)));
 658                         }
 659
 660 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 661                         // If cork support is available outrecsize represents the (rough) max amount of data we give GnuTLS while corked
 662                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512);
 663 #else
 664                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512, 16384);
 665 #endif
 666                         return new Profile(profilename, certstr, keystr, dh, mindh, hashstr, priostr, ca, crl, outrecsize);
 667                 }
 668
 669                 /** Set up the given session with the settings in this profile
 670                  */
 671                 void SetupSession(gnutls_session_t sess)
 672                 {
 673                         priority.SetupSession(sess);
 674                         x509cred.SetupSession(sess);
 675                         gnutls_dh_set_prime_bits(sess, min_dh_bits);
 676
 677                         // Request client certificate if we are a server, no-op if we're a client
 678                         gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
 679                 }
 680
 681                 const std::string& GetName() const { return name; }
 682                 X509Credentials& GetX509Credentials() { return x509cred; }
 683                 gnutls_digest_algorithm_t GetHash() const { return hash.get(); }
 684                 unsigned int GetOutgoingRecordSize() const { return outrecsize; }
 685         };
 686 }
 687
 688 class GnuTLSIOHook : public SSLIOHook
 689 {
 690  private:
 691         gnutls_session_t sess;
 692         issl_status status;
 693         reference<GnuTLS::Profile> profile;
 694 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 695         size_t gbuffersize;
 696 #endif
 697
 698         void CloseSession()
 699         {
 700                 if (this->sess)
 701                 {
 702                         gnutls_bye(this->sess, GNUTLS_SHUT_WR);
 703                         gnutls_deinit(this->sess);
 704                 }
 705                 sess = NULL;
 706                 certificate = NULL;
 707                 status = ISSL_NONE;
 708         }
 709
 710         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 711         int Handshake(StreamSocket* user)
 712         {
 713                 int ret = gnutls_handshake(this->sess);
 714
 715                 if (ret < 0)
 716                 {
 717                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 718                         {
 719                                 // Handshake needs resuming later, read() or write() would have blocked.
 720                                 this->status = ISSL_HANDSHAKING;
 721
 722                                 if (gnutls_record_get_direction(this->sess) == 0)
 723                                 {
 724                                         // gnutls_handshake() wants to read() again.
 725                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 726                                 }
 727                                 else
 728                                 {
 729                                         // gnutls_handshake() wants to write() again.
 730                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 731                                 }
 732
 733                                 return 0;
 734                         }
 735                         else
 736                         {
 737                                 user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret)));
 738                                 CloseSession();
 739                                 return -1;
 740                         }
 741                 }
 742                 else
 743                 {
 744                         // Change the seesion state
 745                         this->status = ISSL_HANDSHAKEN;
 746
 747                         VerifyCertificate();
 748
 749                         // Finish writing, if any left
 750                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 751
 752                         return 1;
 753                 }
 754         }
 755
 756         void VerifyCertificate()
 757         {
 758                 unsigned int certstatus;
 759                 const gnutls_datum_t* cert_list;
 760                 int ret;
 761                 unsigned int cert_list_size;
 762                 gnutls_x509_crt_t cert;
 763                 char str[512];
 764                 unsigned char digest[512];
 765                 size_t digest_size = sizeof(digest);
 766                 size_t name_size = sizeof(str);
 767                 ssl_cert* certinfo = new ssl_cert;
 768                 this->certificate = certinfo;
 769
 770                 /* This verification function uses the trusted CAs in the credentials
 771                  * structure. So you must have installed one or more CA certificates.
 772                  */
 773                 ret = gnutls_certificate_verify_peers2(this->sess, &certstatus);
 774
 775                 if (ret < 0)
 776                 {
 777                         certinfo->error = std::string(gnutls_strerror(ret));
 778                         return;
 779                 }
 780
 781                 certinfo->invalid = (certstatus & GNUTLS_CERT_INVALID);
 782                 certinfo->unknownsigner = (certstatus & GNUTLS_CERT_SIGNER_NOT_FOUND);
 783                 certinfo->revoked = (certstatus & GNUTLS_CERT_REVOKED);
 784                 certinfo->trusted = !(certstatus & GNUTLS_CERT_SIGNER_NOT_CA);
 785
 786                 /* Up to here the process is the same for X.509 certificates and
 787                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 788                  * be easily extended to work with openpgp keys as well.
 789                  */
 790                 if (gnutls_certificate_type_get(this->sess) != GNUTLS_CRT_X509)
 791                 {
 792                         certinfo->error = "No X509 keys sent";
 793                         return;
 794                 }
 795
 796                 ret = gnutls_x509_crt_init(&cert);
 797                 if (ret < 0)
 798                 {
 799                         certinfo->error = gnutls_strerror(ret);
 800                         return;
 801                 }
 802
 803                 cert_list_size = 0;
 804                 cert_list = gnutls_certificate_get_peers(this->sess, &cert_list_size);
 805                 if (cert_list == NULL)
 806                 {
 807                         certinfo->error = "No certificate was found";
 808                         goto info_done_dealloc;
 809                 }
 810
 811                 /* This is not a real world example, since we only check the first
 812                  * certificate in the given chain.
 813                  */
 814
 815                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 816                 if (ret < 0)
 817                 {
 818                         certinfo->error = gnutls_strerror(ret);
 819                         goto info_done_dealloc;
 820                 }
 821
 822                 if (gnutls_x509_crt_get_dn(cert, str, &name_size) == 0)
 823                 {
 824                         std::string& dn = certinfo->dn;
 825                         dn = str;
 826                         // Make sure there are no chars in the string that we consider invalid
 827                         if (dn.find_first_of("\r\n") != std::string::npos)
 828                                 dn.clear();
 829                 }
 830
 831                 name_size = sizeof(str);
 832                 if (gnutls_x509_crt_get_issuer_dn(cert, str, &name_size) == 0)
 833                 {
 834                         std::string& issuer = certinfo->issuer;
 835                         issuer = str;
 836                         if (issuer.find_first_of("\r\n") != std::string::npos)
 837                                 issuer.clear();
 838                 }
 839
 840                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, profile->GetHash(), digest, &digest_size)) < 0)
 841                 {
 842                         certinfo->error = gnutls_strerror(ret);
 843                 }
 844                 else
 845                 {
 846                         certinfo->fingerprint = BinToHex(digest, digest_size);
 847                 }
 848
 849                 /* Beware here we do not check for errors.
 850                  */
 851                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 852                 {
 853                         certinfo->error = "Not activated, or expired certificate";
 854                 }
 855
 856 info_done_dealloc:
 857                 gnutls_x509_crt_deinit(cert);
 858         }
 859
 860         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 861         int PrepareIO(StreamSocket* sock)
 862         {
 863                 if (status == ISSL_HANDSHAKEN)
 864                         return 1;
 865                 else if (status == ISSL_HANDSHAKING)
 866                 {
 867                         // The handshake isn't finished, try to finish it
 868                         return Handshake(sock);
 869                 }
 870
 871                 CloseSession();
 872                 sock->SetError("No SSL session");
 873                 return -1;
 874         }
 875
 876 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 877         int FlushBuffer(StreamSocket* sock)
 878         {
 879                 // If GnuTLS has some data buffered, write it
 880                 if (gbuffersize)
 881                         return HandleWriteRet(sock, gnutls_record_uncork(this->sess, 0));
 882                 return 1;
 883         }
 884 #endif
 885
 886         int HandleWriteRet(StreamSocket* sock, int ret)
 887         {
 888                 if (ret > 0)
 889                 {
 890 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 891                         gbuffersize -= ret;
 892                         if (gbuffersize)
 893                         {
 894                                 SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 895                                 return 0;
 896                         }
 897 #endif
 898                         return ret;
 899                 }
 900                 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
 901                 {
 902                         SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 903                         return 0;
 904                 }
 905                 else // (ret < 0)
 906                 {
 907                         sock->SetError(gnutls_strerror(ret));
 908                         CloseSession();
 909                         return -1;
 910                 }
 911         }
 912
 913         static const char* UnknownIfNULL(const char* str)
 914         {
 915                 return str ? str : "UNKNOWN";
 916         }
 917
 918         static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size)
 919         {
 920                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 921 #ifdef _WIN32
 922                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 923 #endif
 924
 925                 if (sock->GetEventMask() & FD_READ_WILL_BLOCK)
 926                 {
 927 #ifdef _WIN32
 928                         gnutls_transport_set_errno(session->sess, EAGAIN);
 929 #else
 930                         errno = EAGAIN;
 931 #endif
 932                         return -1;
 933                 }
 934
 935                 int rv = SocketEngine::Recv(sock, reinterpret_cast<char *>(buffer), size, 0);
 936
 937 #ifdef _WIN32
 938                 if (rv < 0)
 939                 {
 940                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
 941                          * and then set errno appropriately.
 942                          * The gnutls library may also have a different errno variable than us, see
 943                          * gnutls_transport_set_errno(3).
 944                          */
 945                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 946                 }
 947 #endif
 948
 949                 if (rv < (int)size)
 950                         SocketEngine::ChangeEventMask(sock, FD_READ_WILL_BLOCK);
 951                 return rv;
 952         }
 953
 954 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 955         static ssize_t VectorPush(gnutls_transport_ptr_t transportptr, const giovec_t* iov, int iovcnt)
 956         {
 957                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(transportptr);
 958 #ifdef _WIN32
 959                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 960 #endif
 961
 962                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 963                 {
 964 #ifdef _WIN32
 965                         gnutls_transport_set_errno(session->sess, EAGAIN);
 966 #else
 967                         errno = EAGAIN;
 968 #endif
 969                         return -1;
 970                 }
 971
 972                 // Cast the giovec_t to iovec not to IOVector so the correct function is called on Windows
 973                 int ret = SocketEngine::WriteV(sock, reinterpret_cast<const iovec*>(iov), iovcnt);
 974 #ifdef _WIN32
 975                 // See the function above for more info about the usage of gnutls_transport_set_errno() on Windows
 976                 if (ret < 0)
 977                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 978 #endif
 979
 980                 int size = 0;
 981                 for (int i = 0; i < iovcnt; i++)
 982                         size += iov[i].iov_len;
 983
 984                 if (ret < size)
 985                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
 986                 return ret;
 987         }
 988
 989 #else // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 990         static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size)
 991         {
 992                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 993 #ifdef _WIN32
 994                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 995 #endif
 996
 997                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 998                 {
 999 #ifdef _WIN32
1000                         gnutls_transport_set_errno(session->sess, EAGAIN);
1001 #else
1002                         errno = EAGAIN;
1003 #endif
1004                         return -1;
1005                 }
1006
1007                 int rv = SocketEngine::Send(sock, reinterpret_cast<const char *>(buffer), size, 0);
1008
1009 #ifdef _WIN32
1010                 if (rv < 0)
1011                 {
1012                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
1013                          * and then set errno appropriately.
1014                          * The gnutls library may also have a different errno variable than us, see
1015                          * gnutls_transport_set_errno(3).
1016                          */
1017                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
1018                 }
1019 #endif
1020
1021                 if (rv < (int)size)
1022                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
1023                 return rv;
1024         }
1025 #endif // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1026
1027  public:
1028         GnuTLSIOHook(IOHookProvider* hookprov, StreamSocket* sock, inspircd_gnutls_session_init_flags_t flags, const reference<GnuTLS::Profile>& sslprofile)
1029                 : SSLIOHook(hookprov)
1030                 , sess(NULL)
1031                 , status(ISSL_NONE)
1032                 , profile(sslprofile)
1033 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1034                 , gbuffersize(0)
1035 #endif
1036         {
1037                 gnutls_init(&sess, flags);
1038                 gnutls_transport_set_ptr(sess, reinterpret_cast<gnutls_transport_ptr_t>(sock));
1039 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1040                 gnutls_transport_set_vec_push_function(sess, VectorPush);
1041 #else
1042                 gnutls_transport_set_push_function(sess, gnutls_push_wrapper);
1043 #endif
1044                 gnutls_transport_set_pull_function(sess, gnutls_pull_wrapper);
1045                 profile->SetupSession(sess);
1046
1047                 sock->AddIOHook(this);
1048                 Handshake(sock);
1049         }
1050
1051         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
1052         {
1053                 CloseSession();
1054         }
1055
1056         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
1057         {
1058                 // Finish handshake if needed
1059                 int prepret = PrepareIO(user);
1060                 if (prepret <= 0)
1061                         return prepret;
1062
1063                 // If we resumed the handshake then this->status will be ISSL_HANDSHAKEN.
1064                 {
1065                         GnuTLS::DataReader reader(sess);
1066                         int ret = reader.ret();
1067                         if (ret > 0)
1068                         {
1069                                 reader.appendto(recvq);
1070                                 return 1;
1071                         }
1072                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
1073                         {
1074                                 return 0;
1075                         }
1076                         else if (ret == 0)
1077                         {
1078                                 user->SetError("Connection closed");
1079                                 CloseSession();
1080                                 return -1;
1081                         }
1082                         else
1083                         {
1084                                 user->SetError(gnutls_strerror(ret));
1085                                 CloseSession();
1086                                 return -1;
1087                         }
1088                 }
1089         }
1090
1091         int OnStreamSocketWrite(StreamSocket* user, StreamSocket::SendQueue& sendq) CXX11_OVERRIDE
1092         {
1093                 // Finish handshake if needed
1094                 int prepret = PrepareIO(user);
1095                 if (prepret <= 0)
1096                         return prepret;
1097
1098                 // Session is ready for transferring application data
1099
1100 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1101                 while (true)
1102                 {
1103                         // If there is something in the GnuTLS buffer try to send() it
1104                         int ret = FlushBuffer(user);
1105                         if (ret <= 0)
1106                                 return ret; // Couldn't flush entire buffer, retry later (or close on error)
1107
1108                         // GnuTLS buffer is empty, if the sendq is empty as well then break to set FD_WANT_NO_WRITE
1109                         if (sendq.empty())
1110                                 break;
1111
1112                         // GnuTLS buffer is empty but sendq is not, begin sending data from the sendq
1113                         gnutls_record_cork(this->sess);
1114                         while ((!sendq.empty()) && (gbuffersize < profile->GetOutgoingRecordSize()))
1115                         {
1116                                 const StreamSocket::SendQueue::Element& elem = sendq.front();
1117                                 gbuffersize += elem.length();
1118                                 ret = gnutls_record_send(this->sess, elem.data(), elem.length());
1119                                 if (ret < 0)
1120                                 {
1121                                         CloseSession();
1122                                         return -1;
1123                                 }
1124                                 sendq.pop_front();
1125                         }
1126                 }
1127 #else
1128                 int ret = 0;
1129
1130                 while (!sendq.empty())
1131                 {
1132                         FlattenSendQueue(sendq, profile->GetOutgoingRecordSize());
1133                         const StreamSocket::SendQueue::Element& buffer = sendq.front();
1134                         ret = HandleWriteRet(user, gnutls_record_send(this->sess, buffer.data(), buffer.length()));
1135
1136                         if (ret <= 0)
1137                                 return ret;
1138                         else if (ret < (int)buffer.length())
1139                         {
1140                                 sendq.erase_front(ret);
1141                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
1142                                 return 0;
1143                         }
1144
1145                         // Wrote entire record, continue sending
1146                         sendq.pop_front();
1147                 }
1148 #endif
1149
1150                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_WRITE);
1151                 return 1;
1152         }
1153
1154         void GetCiphersuite(std::string& out) const CXX11_OVERRIDE
1155         {
1156                 if (!IsHandshakeDone())
1157                         return;
1158                 out.append(UnknownIfNULL(gnutls_protocol_get_name(gnutls_protocol_get_version(sess)))).push_back('-');
1159                 out.append(UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess)))).push_back('-');
1160                 out.append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).push_back('-');
1161                 out.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess))));
1162         }
1163
1164         GnuTLS::Profile* GetProfile() { return profile; }
1165         bool IsHandshakeDone() const { return (status == ISSL_HANDSHAKEN); }
1166 };
1167
1168 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)
1169 {
1170 #ifndef GNUTLS_NEW_CERT_CALLBACK_API
1171         st->type = GNUTLS_CRT_X509;
1172 #else
1173         st->cert_type = GNUTLS_CRT_X509;
1174         st->key_type = GNUTLS_PRIVKEY_X509;
1175 #endif
1176         StreamSocket* sock = reinterpret_cast<StreamSocket*>(gnutls_transport_get_ptr(sess));
1177         GnuTLS::X509Credentials& cred = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod))->GetProfile()->GetX509Credentials();
1178
1179         st->ncerts = cred.certs.size();
1180         st->cert.x509 = cred.certs.raw();
1181         st->key.x509 = cred.key.get();
1182         st->deinit_all = 0;
1183
1184         return 0;
1185 }
1186
1187 class GnuTLSIOHookProvider : public refcountbase, public IOHookProvider
1188 {
1189         reference<GnuTLS::Profile> profile;
1190
1191  public:
1192         GnuTLSIOHookProvider(Module* mod, reference<GnuTLS::Profile>& prof)
1193                 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
1194                 , profile(prof)
1195         {
1196                 ServerInstance->Modules->AddService(*this);
1197         }
1198
1199         ~GnuTLSIOHookProvider()
1200         {
1201                 ServerInstance->Modules->DelService(*this);
1202         }
1203
1204         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
1205         {
1206                 new GnuTLSIOHook(this, sock, GNUTLS_SERVER, profile);
1207         }
1208
1209         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
1210         {
1211                 new GnuTLSIOHook(this, sock, GNUTLS_CLIENT, profile);
1212         }
1213 };
1214
1215 class ModuleSSLGnuTLS : public Module
1216 {
1217         typedef std::vector<reference<GnuTLSIOHookProvider> > ProfileList;
1218
1219         // First member of the class, gets constructed first and destructed last
1220         GnuTLS::Init libinit;
1221         RandGen randhandler;
1222         ProfileList profiles;
1223
1224         void ReadProfiles()
1225         {
1226                 // First, store all profiles in a new, temporary container. If no problems occur, swap the two
1227                 // containers; this way if something goes wrong we can go back and continue using the current profiles,
1228                 // avoiding unpleasant situations where no new SSL connections are possible.
1229                 ProfileList newprofiles;
1230
1231                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
1232                 if (tags.first == tags.second)
1233                 {
1234                         // No <sslprofile> tags found, create a profile named "gnutls" from settings in the <gnutls> block
1235                         const std::string defname = "gnutls";
1236                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
1237                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found; using settings from the <gnutls> tag");
1238
1239                         try
1240                         {
1241                                 reference<GnuTLS::Profile> profile(GnuTLS::Profile::Create(defname, tag));
1242                                 newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1243                         }
1244                         catch (CoreException& ex)
1245                         {
1246                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
1247                         }
1248                 }
1249
1250                 for (ConfigIter i = tags.first; i != tags.second; ++i)
1251                 {
1252                         ConfigTag* tag = i->second;
1253                         if (tag->getString("provider") != "gnutls")
1254                                 continue;
1255
1256                         std::string name = tag->getString("name");
1257                         if (name.empty())
1258                         {
1259                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
1260                                 continue;
1261                         }
1262
1263                         reference<GnuTLS::Profile> profile;
1264                         try
1265                         {
1266                                 profile = GnuTLS::Profile::Create(name, tag);
1267                         }
1268                         catch (CoreException& ex)
1269                         {
1270                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
1271                         }
1272
1273                         newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1274                 }
1275
1276                 // New profiles are ok, begin using them
1277                 // Old profiles are deleted when their refcount drops to zero
1278                 profiles.swap(newprofiles);
1279         }
1280
1281  public:
1282         ModuleSSLGnuTLS()
1283         {
1284 #ifndef GNUTLS_HAS_RND
1285                 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
1286 #endif
1287                 thismod = this;
1288         }
1289
1290         void init() CXX11_OVERRIDE
1291         {
1292                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "GnuTLS lib version %s module was compiled for " GNUTLS_VERSION, gnutls_check_version(NULL));
1293                 ReadProfiles();
1294                 ServerInstance->GenRandom = &randhandler;
1295         }
1296
1297         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
1298         {
1299                 if(param != "ssl")
1300                         return;
1301
1302                 try
1303                 {
1304                         ReadProfiles();
1305                 }
1306                 catch (ModuleException& ex)
1307                 {
1308                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
1309                 }
1310         }
1311
1312         ~ModuleSSLGnuTLS()
1313         {
1314                 ServerInstance->GenRandom = &ServerInstance->HandleGenRandom;
1315         }
1316
1317         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
1318         {
1319                 if(target_type == TYPE_USER)
1320                 {
1321                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
1322
1323                         if ((user) && (user->eh.GetModHook(this)))
1324                         {
1325                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
1326                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
1327                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
1328                         }
1329                 }
1330         }
1331
1332         Version GetVersion() CXX11_OVERRIDE
1333         {
1334                 return Version("Provides SSL support for clients", VF_VENDOR);
1335         }
1336
1337         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
1338         {
1339                 const GnuTLSIOHook* const iohook = static_cast<GnuTLSIOHook*>(user->eh.GetModHook(this));
1340                 if ((iohook) && (!iohook->IsHandshakeDone()))
1341                         return MOD_RES_DENY;
1342                 return MOD_RES_PASSTHRU;
1343         }
1344 };
1345
1346 MODULE_INIT(ModuleSSLGnuTLS)