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                 static const char* GetDefault()
 350                 {
 351                         return "NORMAL:%SERVER_PRECEDENCE:-VERS-SSL3.0";
 352                 }
 353
 354                 static std::string RemoveUnknownTokens(const std::string& prio)
 355                 {
 356                         std::string ret;
 357                         irc::sepstream ss(prio, ':');
 358                         for (std::string token; ss.GetToken(token); )
 359                         {
 360                                 // Save current position so we can revert later if needed
 361                                 const std::string::size_type prevpos = ret.length();
 362                                 // Append next token
 363                                 if (!ret.empty())
 364                                         ret.push_back(':');
 365                                 ret.append(token);
 366
 367                                 gnutls_priority_t test;
 368                                 if (gnutls_priority_init(&test, ret.c_str(), NULL) < 0)
 369                                 {
 370                                         // The new token broke the priority string, revert to the previously working one
 371                                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Priority string token not recognized: \"%s\"", token.c_str());
 372                                         ret.erase(prevpos);
 373                                 }
 374                                 else
 375                                 {
 376                                         // Worked
 377                                         gnutls_priority_deinit(test);
 378                                 }
 379                         }
 380                         return ret;
 381                 }
 382         };
 383 #else
 384         /** Dummy class, used when gnutls_priority_set() is not available
 385          */
 386         class Priority
 387         {
 388          public:
 389                 Priority(const std::string& priorities)
 390                 {
 391                         if (priorities != GetDefault())
 392                                 throw Exception("You've set a non-default priority string, but GnuTLS lacks support for it");
 393                 }
 394
 395                 static void SetupSession(gnutls_session_t sess)
 396                 {
 397                         // Always set the default priorities
 398                         gnutls_set_default_priority(sess);
 399                 }
 400
 401                 static const char* GetDefault()
 402                 {
 403                         return "NORMAL";
 404                 }
 405
 406                 static std::string RemoveUnknownTokens(const std::string& prio)
 407                 {
 408                         // We don't do anything here because only NORMAL is accepted
 409                         return prio;
 410                 }
 411         };
 412 #endif
 413
 414         class CertCredentials
 415         {
 416                 /** DH parameters associated with these credentials
 417                  */
 418                 std::auto_ptr<DHParams> dh;
 419
 420          protected:
 421                 gnutls_certificate_credentials_t cred;
 422
 423          public:
 424                 CertCredentials()
 425                 {
 426                         ThrowOnError(gnutls_certificate_allocate_credentials(&cred), "Cannot allocate certificate credentials");
 427                 }
 428
 429                 ~CertCredentials()
 430                 {
 431                         gnutls_certificate_free_credentials(cred);
 432                 }
 433
 434                 /** Associates these credentials with the session
 435                  */
 436                 void SetupSession(gnutls_session_t sess)
 437                 {
 438                         gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, cred);
 439                 }
 440
 441                 /** Set the given DH parameters to be used with these credentials
 442                  */
 443                 void SetDH(std::auto_ptr<DHParams>& DH)
 444                 {
 445                         dh = DH;
 446                         gnutls_certificate_set_dh_params(cred, dh->get());
 447                 }
 448         };
 449
 450         class X509Credentials : public CertCredentials
 451         {
 452                 /** Private key
 453                  */
 454                 X509Key key;
 455
 456                 /** Certificate list, presented to the peer
 457                  */
 458                 X509CertList certs;
 459
 460                 /** Trusted CA, may be NULL
 461                  */
 462                 std::auto_ptr<X509CertList> trustedca;
 463
 464                 /** Certificate revocation list, may be NULL
 465                  */
 466                 std::auto_ptr<X509CRL> crl;
 467
 468                 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);
 469
 470          public:
 471                 X509Credentials(const std::string& certstr, const std::string& keystr)
 472                         : key(keystr)
 473                         , certs(certstr)
 474                 {
 475                         // Throwing is ok here, the destructor of Credentials is called in that case
 476                         int ret = gnutls_certificate_set_x509_key(cred, certs.raw(), certs.size(), key.get());
 477                         ThrowOnError(ret, "Unable to set cert/key pair");
 478
 479 #ifdef GNUTLS_NEW_CERT_CALLBACK_API
 480                         gnutls_certificate_set_retrieve_function(cred, cert_callback);
 481 #else
 482                         gnutls_certificate_client_set_retrieve_function(cred, cert_callback);
 483 #endif
 484                 }
 485
 486                 /** Sets the trusted CA and the certificate revocation list
 487                  * to use when verifying certificates
 488                  */
 489                 void SetCA(std::auto_ptr<X509CertList>& certlist, std::auto_ptr<X509CRL>& CRL)
 490                 {
 491                         // Do nothing if certlist is NULL
 492                         if (certlist.get())
 493                         {
 494                                 int ret = gnutls_certificate_set_x509_trust(cred, certlist->raw(), certlist->size());
 495                                 ThrowOnError(ret, "gnutls_certificate_set_x509_trust() failed");
 496
 497                                 if (CRL.get())
 498                                 {
 499                                         ret = gnutls_certificate_set_x509_crl(cred, &CRL->get(), 1);
 500                                         ThrowOnError(ret, "gnutls_certificate_set_x509_crl() failed");
 501                                 }
 502
 503                                 trustedca = certlist;
 504                                 crl = CRL;
 505                         }
 506                 }
 507         };
 508
 509         class DataReader
 510         {
 511                 int retval;
 512 #ifdef INSPIRCD_GNUTLS_HAS_RECV_PACKET
 513                 gnutls_packet_t packet;
 514
 515          public:
 516                 DataReader(gnutls_session_t sess)
 517                 {
 518                         // Using the packet API avoids the final copy of the data which GnuTLS does if we supply
 519                         // our own buffer. Instead, we get the buffer containing the data from GnuTLS and copy it
 520                         // to the recvq directly from there in appendto().
 521                         retval = gnutls_record_recv_packet(sess, &packet);
 522                 }
 523
 524                 void appendto(std::string& recvq)
 525                 {
 526                         // Copy data from GnuTLS buffers to recvq
 527                         gnutls_datum_t datum;
 528                         gnutls_packet_get(packet, &datum, NULL);
 529                         recvq.append(reinterpret_cast<const char*>(datum.data), datum.size);
 530
 531                         gnutls_packet_deinit(packet);
 532                 }
 533 #else
 534                 char* const buffer;
 535
 536          public:
 537                 DataReader(gnutls_session_t sess)
 538                         : buffer(ServerInstance->GetReadBuffer())
 539                 {
 540                         // Read data from GnuTLS buffers into ReadBuffer
 541                         retval = gnutls_record_recv(sess, buffer, ServerInstance->Config->NetBufferSize);
 542                 }
 543
 544                 void appendto(std::string& recvq)
 545                 {
 546                         // Copy data from ReadBuffer to recvq
 547                         recvq.append(buffer, retval);
 548                 }
 549 #endif
 550
 551                 int ret() const { return retval; }
 552         };
 553
 554         class Profile : public refcountbase
 555         {
 556                 /** Name of this profile
 557                  */
 558                 const std::string name;
 559
 560                 /** X509 certificate(s) and key
 561                  */
 562                 X509Credentials x509cred;
 563
 564                 /** The minimum length in bits for the DH prime to be accepted as a client
 565                  */
 566                 unsigned int min_dh_bits;
 567
 568                 /** Hashing algorithm to use when generating certificate fingerprints
 569                  */
 570                 Hash hash;
 571
 572                 /** Priorities for ciphers, compression methods, etc.
 573                  */
 574                 Priority priority;
 575
 576                 /** Rough max size of records to send
 577                  */
 578                 const unsigned int outrecsize;
 579
 580                 Profile(const std::string& profilename, const std::string& certstr, const std::string& keystr,
 581                                 std::auto_ptr<DHParams>& DH, unsigned int mindh, const std::string& hashstr,
 582                                 const std::string& priostr, std::auto_ptr<X509CertList>& CA, std::auto_ptr<X509CRL>& CRL,
 583                                 unsigned int recsize)
 584                         : name(profilename)
 585                         , x509cred(certstr, keystr)
 586                         , min_dh_bits(mindh)
 587                         , hash(hashstr)
 588                         , priority(priostr)
 589                         , outrecsize(recsize)
 590                 {
 591                         x509cred.SetDH(DH);
 592                         x509cred.SetCA(CA, CRL);
 593                 }
 594
 595                 static std::string ReadFile(const std::string& filename)
 596                 {
 597                         FileReader reader(filename);
 598                         std::string ret = reader.GetString();
 599                         if (ret.empty())
 600                                 throw Exception("Cannot read file " + filename);
 601                         return ret;
 602                 }
 603
 604                 static std::string GetPrioStr(const std::string& profilename, ConfigTag* tag)
 605                 {
 606                         // Use default priority string if this tag does not specify one
 607                         std::string priostr = GnuTLS::Priority::GetDefault();
 608                         bool found = tag->readString("priority", priostr);
 609                         // 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
 610                         if (!tag->getBool("strictpriority", found))
 611                         {
 612                                 std::string stripped = GnuTLS::Priority::RemoveUnknownTokens(priostr);
 613                                 if (stripped.empty())
 614                                 {
 615                                         // Stripping failed, act as if a prio string wasn't set
 616                                         stripped = GnuTLS::Priority::RemoveUnknownTokens(GnuTLS::Priority::GetDefault());
 617                                         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());
 618                                 }
 619                                 else if ((found) && (stripped != priostr))
 620                                 {
 621                                         // Prio string was set in the config and we ended up with something that works but different
 622                                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Priority string for profile \"%s\" contains unknown tokens, stripped to \"%s\"", profilename.c_str(), stripped.c_str());
 623                                 }
 624                                 priostr.swap(stripped);
 625                         }
 626                         return priostr;
 627                 }
 628
 629          public:
 630                 static reference<Profile> Create(const std::string& profilename, ConfigTag* tag)
 631                 {
 632                         std::string certstr = ReadFile(tag->getString("certfile", "cert.pem"));
 633                         std::string keystr = ReadFile(tag->getString("keyfile", "key.pem"));
 634
 635                         std::auto_ptr<DHParams> dh = DHParams::Import(ReadFile(tag->getString("dhfile", "dhparams.pem")));
 636
 637                         std::string priostr = GetPrioStr(profilename, tag);
 638                         unsigned int mindh = tag->getInt("mindhbits", 1024);
 639                         std::string hashstr = tag->getString("hash", "md5");
 640
 641                         // Load trusted CA and revocation list, if set
 642                         std::auto_ptr<X509CertList> ca;
 643                         std::auto_ptr<X509CRL> crl;
 644                         std::string filename = tag->getString("cafile");
 645                         if (!filename.empty())
 646                         {
 647                                 ca.reset(new X509CertList(ReadFile(filename)));
 648
 649                                 filename = tag->getString("crlfile");
 650                                 if (!filename.empty())
 651                                         crl.reset(new X509CRL(ReadFile(filename)));
 652                         }
 653
 654 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 655                         // If cork support is available outrecsize represents the (rough) max amount of data we give GnuTLS while corked
 656                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512);
 657 #else
 658                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512, 16384);
 659 #endif
 660                         return new Profile(profilename, certstr, keystr, dh, mindh, hashstr, priostr, ca, crl, outrecsize);
 661                 }
 662
 663                 /** Set up the given session with the settings in this profile
 664                  */
 665                 void SetupSession(gnutls_session_t sess)
 666                 {
 667                         priority.SetupSession(sess);
 668                         x509cred.SetupSession(sess);
 669                         gnutls_dh_set_prime_bits(sess, min_dh_bits);
 670
 671                         // Request client certificate if we are a server, no-op if we're a client
 672                         gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
 673                 }
 674
 675                 const std::string& GetName() const { return name; }
 676                 X509Credentials& GetX509Credentials() { return x509cred; }
 677                 gnutls_digest_algorithm_t GetHash() const { return hash.get(); }
 678                 unsigned int GetOutgoingRecordSize() const { return outrecsize; }
 679         };
 680 }
 681
 682 class GnuTLSIOHook : public SSLIOHook
 683 {
 684  private:
 685         gnutls_session_t sess;
 686         issl_status status;
 687         reference<GnuTLS::Profile> profile;
 688 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 689         size_t gbuffersize;
 690 #endif
 691
 692         void CloseSession()
 693         {
 694                 if (this->sess)
 695                 {
 696                         gnutls_bye(this->sess, GNUTLS_SHUT_WR);
 697                         gnutls_deinit(this->sess);
 698                 }
 699                 sess = NULL;
 700                 certificate = NULL;
 701                 status = ISSL_NONE;
 702         }
 703
 704         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 705         int Handshake(StreamSocket* user)
 706         {
 707                 int ret = gnutls_handshake(this->sess);
 708
 709                 if (ret < 0)
 710                 {
 711                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 712                         {
 713                                 // Handshake needs resuming later, read() or write() would have blocked.
 714                                 this->status = ISSL_HANDSHAKING;
 715
 716                                 if (gnutls_record_get_direction(this->sess) == 0)
 717                                 {
 718                                         // gnutls_handshake() wants to read() again.
 719                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 720                                 }
 721                                 else
 722                                 {
 723                                         // gnutls_handshake() wants to write() again.
 724                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 725                                 }
 726
 727                                 return 0;
 728                         }
 729                         else
 730                         {
 731                                 user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret)));
 732                                 CloseSession();
 733                                 return -1;
 734                         }
 735                 }
 736                 else
 737                 {
 738                         // Change the seesion state
 739                         this->status = ISSL_HANDSHAKEN;
 740
 741                         VerifyCertificate();
 742
 743                         // Finish writing, if any left
 744                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 745
 746                         return 1;
 747                 }
 748         }
 749
 750         void VerifyCertificate()
 751         {
 752                 unsigned int certstatus;
 753                 const gnutls_datum_t* cert_list;
 754                 int ret;
 755                 unsigned int cert_list_size;
 756                 gnutls_x509_crt_t cert;
 757                 char str[512];
 758                 unsigned char digest[512];
 759                 size_t digest_size = sizeof(digest);
 760                 size_t name_size = sizeof(str);
 761                 ssl_cert* certinfo = new ssl_cert;
 762                 this->certificate = certinfo;
 763
 764                 /* This verification function uses the trusted CAs in the credentials
 765                  * structure. So you must have installed one or more CA certificates.
 766                  */
 767                 ret = gnutls_certificate_verify_peers2(this->sess, &certstatus);
 768
 769                 if (ret < 0)
 770                 {
 771                         certinfo->error = std::string(gnutls_strerror(ret));
 772                         return;
 773                 }
 774
 775                 certinfo->invalid = (certstatus & GNUTLS_CERT_INVALID);
 776                 certinfo->unknownsigner = (certstatus & GNUTLS_CERT_SIGNER_NOT_FOUND);
 777                 certinfo->revoked = (certstatus & GNUTLS_CERT_REVOKED);
 778                 certinfo->trusted = !(certstatus & GNUTLS_CERT_SIGNER_NOT_CA);
 779
 780                 /* Up to here the process is the same for X.509 certificates and
 781                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 782                  * be easily extended to work with openpgp keys as well.
 783                  */
 784                 if (gnutls_certificate_type_get(this->sess) != GNUTLS_CRT_X509)
 785                 {
 786                         certinfo->error = "No X509 keys sent";
 787                         return;
 788                 }
 789
 790                 ret = gnutls_x509_crt_init(&cert);
 791                 if (ret < 0)
 792                 {
 793                         certinfo->error = gnutls_strerror(ret);
 794                         return;
 795                 }
 796
 797                 cert_list_size = 0;
 798                 cert_list = gnutls_certificate_get_peers(this->sess, &cert_list_size);
 799                 if (cert_list == NULL)
 800                 {
 801                         certinfo->error = "No certificate was found";
 802                         goto info_done_dealloc;
 803                 }
 804
 805                 /* This is not a real world example, since we only check the first
 806                  * certificate in the given chain.
 807                  */
 808
 809                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 810                 if (ret < 0)
 811                 {
 812                         certinfo->error = gnutls_strerror(ret);
 813                         goto info_done_dealloc;
 814                 }
 815
 816                 if (gnutls_x509_crt_get_dn(cert, str, &name_size) == 0)
 817                 {
 818                         std::string& dn = certinfo->dn;
 819                         dn = str;
 820                         // Make sure there are no chars in the string that we consider invalid
 821                         if (dn.find_first_of("\r\n") != std::string::npos)
 822                                 dn.clear();
 823                 }
 824
 825                 name_size = sizeof(str);
 826                 if (gnutls_x509_crt_get_issuer_dn(cert, str, &name_size) == 0)
 827                 {
 828                         std::string& issuer = certinfo->issuer;
 829                         issuer = str;
 830                         if (issuer.find_first_of("\r\n") != std::string::npos)
 831                                 issuer.clear();
 832                 }
 833
 834                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, profile->GetHash(), digest, &digest_size)) < 0)
 835                 {
 836                         certinfo->error = gnutls_strerror(ret);
 837                 }
 838                 else
 839                 {
 840                         certinfo->fingerprint = BinToHex(digest, digest_size);
 841                 }
 842
 843                 /* Beware here we do not check for errors.
 844                  */
 845                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 846                 {
 847                         certinfo->error = "Not activated, or expired certificate";
 848                 }
 849
 850 info_done_dealloc:
 851                 gnutls_x509_crt_deinit(cert);
 852         }
 853
 854         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 855         int PrepareIO(StreamSocket* sock)
 856         {
 857                 if (status == ISSL_HANDSHAKEN)
 858                         return 1;
 859                 else if (status == ISSL_HANDSHAKING)
 860                 {
 861                         // The handshake isn't finished, try to finish it
 862                         return Handshake(sock);
 863                 }
 864
 865                 CloseSession();
 866                 sock->SetError("No SSL session");
 867                 return -1;
 868         }
 869
 870 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 871         int FlushBuffer(StreamSocket* sock)
 872         {
 873                 // If GnuTLS has some data buffered, write it
 874                 if (gbuffersize)
 875                         return HandleWriteRet(sock, gnutls_record_uncork(this->sess, 0));
 876                 return 1;
 877         }
 878 #endif
 879
 880         int HandleWriteRet(StreamSocket* sock, int ret)
 881         {
 882                 if (ret > 0)
 883                 {
 884 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 885                         gbuffersize -= ret;
 886                         if (gbuffersize)
 887                         {
 888                                 SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 889                                 return 0;
 890                         }
 891 #endif
 892                         return ret;
 893                 }
 894                 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
 895                 {
 896                         SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 897                         return 0;
 898                 }
 899                 else // (ret < 0)
 900                 {
 901                         sock->SetError(gnutls_strerror(ret));
 902                         CloseSession();
 903                         return -1;
 904                 }
 905         }
 906
 907         static const char* UnknownIfNULL(const char* str)
 908         {
 909                 return str ? str : "UNKNOWN";
 910         }
 911
 912         static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size)
 913         {
 914                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 915 #ifdef _WIN32
 916                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 917 #endif
 918
 919                 if (sock->GetEventMask() & FD_READ_WILL_BLOCK)
 920                 {
 921 #ifdef _WIN32
 922                         gnutls_transport_set_errno(session->sess, EAGAIN);
 923 #else
 924                         errno = EAGAIN;
 925 #endif
 926                         return -1;
 927                 }
 928
 929                 int rv = SocketEngine::Recv(sock, reinterpret_cast<char *>(buffer), size, 0);
 930
 931 #ifdef _WIN32
 932                 if (rv < 0)
 933                 {
 934                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
 935                          * and then set errno appropriately.
 936                          * The gnutls library may also have a different errno variable than us, see
 937                          * gnutls_transport_set_errno(3).
 938                          */
 939                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 940                 }
 941 #endif
 942
 943                 if (rv < (int)size)
 944                         SocketEngine::ChangeEventMask(sock, FD_READ_WILL_BLOCK);
 945                 return rv;
 946         }
 947
 948 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 949         static ssize_t VectorPush(gnutls_transport_ptr_t transportptr, const giovec_t* iov, int iovcnt)
 950         {
 951                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(transportptr);
 952 #ifdef _WIN32
 953                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 954 #endif
 955
 956                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 957                 {
 958 #ifdef _WIN32
 959                         gnutls_transport_set_errno(session->sess, EAGAIN);
 960 #else
 961                         errno = EAGAIN;
 962 #endif
 963                         return -1;
 964                 }
 965
 966                 // Cast the giovec_t to iovec not to IOVector so the correct function is called on Windows
 967                 int ret = SocketEngine::WriteV(sock, reinterpret_cast<const iovec*>(iov), iovcnt);
 968 #ifdef _WIN32
 969                 // See the function above for more info about the usage of gnutls_transport_set_errno() on Windows
 970                 if (ret < 0)
 971                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 972 #endif
 973
 974                 int size = 0;
 975                 for (int i = 0; i < iovcnt; i++)
 976                         size += iov[i].iov_len;
 977
 978                 if (ret < size)
 979                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
 980                 return ret;
 981         }
 982
 983 #else // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 984         static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size)
 985         {
 986                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 987 #ifdef _WIN32
 988                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 989 #endif
 990
 991                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 992                 {
 993 #ifdef _WIN32
 994                         gnutls_transport_set_errno(session->sess, EAGAIN);
 995 #else
 996                         errno = EAGAIN;
 997 #endif
 998                         return -1;
 999                 }
1000
1001                 int rv = SocketEngine::Send(sock, reinterpret_cast<const char *>(buffer), size, 0);
1002
1003 #ifdef _WIN32
1004                 if (rv < 0)
1005                 {
1006                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
1007                          * and then set errno appropriately.
1008                          * The gnutls library may also have a different errno variable than us, see
1009                          * gnutls_transport_set_errno(3).
1010                          */
1011                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
1012                 }
1013 #endif
1014
1015                 if (rv < (int)size)
1016                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
1017                 return rv;
1018         }
1019 #endif // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1020
1021  public:
1022         GnuTLSIOHook(IOHookProvider* hookprov, StreamSocket* sock, inspircd_gnutls_session_init_flags_t flags, const reference<GnuTLS::Profile>& sslprofile)
1023                 : SSLIOHook(hookprov)
1024                 , sess(NULL)
1025                 , status(ISSL_NONE)
1026                 , profile(sslprofile)
1027 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1028                 , gbuffersize(0)
1029 #endif
1030         {
1031                 gnutls_init(&sess, flags);
1032                 gnutls_transport_set_ptr(sess, reinterpret_cast<gnutls_transport_ptr_t>(sock));
1033 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1034                 gnutls_transport_set_vec_push_function(sess, VectorPush);
1035 #else
1036                 gnutls_transport_set_push_function(sess, gnutls_push_wrapper);
1037 #endif
1038                 gnutls_transport_set_pull_function(sess, gnutls_pull_wrapper);
1039                 profile->SetupSession(sess);
1040
1041                 sock->AddIOHook(this);
1042                 Handshake(sock);
1043         }
1044
1045         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
1046         {
1047                 CloseSession();
1048         }
1049
1050         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
1051         {
1052                 // Finish handshake if needed
1053                 int prepret = PrepareIO(user);
1054                 if (prepret <= 0)
1055                         return prepret;
1056
1057                 // If we resumed the handshake then this->status will be ISSL_HANDSHAKEN.
1058                 {
1059                         GnuTLS::DataReader reader(sess);
1060                         int ret = reader.ret();
1061                         if (ret > 0)
1062                         {
1063                                 reader.appendto(recvq);
1064                                 return 1;
1065                         }
1066                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
1067                         {
1068                                 return 0;
1069                         }
1070                         else if (ret == 0)
1071                         {
1072                                 user->SetError("Connection closed");
1073                                 CloseSession();
1074                                 return -1;
1075                         }
1076                         else
1077                         {
1078                                 user->SetError(gnutls_strerror(ret));
1079                                 CloseSession();
1080                                 return -1;
1081                         }
1082                 }
1083         }
1084
1085         int OnStreamSocketWrite(StreamSocket* user) CXX11_OVERRIDE
1086         {
1087                 // Finish handshake if needed
1088                 int prepret = PrepareIO(user);
1089                 if (prepret <= 0)
1090                         return prepret;
1091
1092                 // Session is ready for transferring application data
1093                 StreamSocket::SendQueue& sendq = user->GetSendQ();
1094
1095 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1096                 while (true)
1097                 {
1098                         // If there is something in the GnuTLS buffer try to send() it
1099                         int ret = FlushBuffer(user);
1100                         if (ret <= 0)
1101                                 return ret; // Couldn't flush entire buffer, retry later (or close on error)
1102
1103                         // GnuTLS buffer is empty, if the sendq is empty as well then break to set FD_WANT_NO_WRITE
1104                         if (sendq.empty())
1105                                 break;
1106
1107                         // GnuTLS buffer is empty but sendq is not, begin sending data from the sendq
1108                         gnutls_record_cork(this->sess);
1109                         while ((!sendq.empty()) && (gbuffersize < profile->GetOutgoingRecordSize()))
1110                         {
1111                                 const StreamSocket::SendQueue::Element& elem = sendq.front();
1112                                 gbuffersize += elem.length();
1113                                 ret = gnutls_record_send(this->sess, elem.data(), elem.length());
1114                                 if (ret < 0)
1115                                 {
1116                                         CloseSession();
1117                                         return -1;
1118                                 }
1119                                 sendq.pop_front();
1120                         }
1121                 }
1122 #else
1123                 int ret = 0;
1124
1125                 while (!sendq.empty())
1126                 {
1127                         FlattenSendQueue(sendq, profile->GetOutgoingRecordSize());
1128                         const StreamSocket::SendQueue::Element& buffer = sendq.front();
1129                         ret = HandleWriteRet(user, gnutls_record_send(this->sess, buffer.data(), buffer.length()));
1130
1131                         if (ret <= 0)
1132                                 return ret;
1133                         else if (ret < (int)buffer.length())
1134                         {
1135                                 sendq.erase_front(ret);
1136                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
1137                                 return 0;
1138                         }
1139
1140                         // Wrote entire record, continue sending
1141                         sendq.pop_front();
1142                 }
1143 #endif
1144
1145                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_WRITE);
1146                 return 1;
1147         }
1148
1149         void TellCiphersAndFingerprint(LocalUser* user)
1150         {
1151                 if (sess)
1152                 {
1153                         std::string text = "*** You are connected using SSL cipher '";
1154                         GetCiphersuite(text);
1155                         text += '\'';
1156                         if (!certificate->fingerprint.empty())
1157                                 text += " and your SSL certificate fingerprint is " + certificate->fingerprint;
1158
1159                         user->WriteNotice(text);
1160                 }
1161         }
1162
1163         void GetCiphersuite(std::string& out) const
1164         {
1165                 out.append(UnknownIfNULL(gnutls_protocol_get_name(gnutls_protocol_get_version(sess)))).push_back('-');
1166                 out.append(UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess)))).push_back('-');
1167                 out.append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).push_back('-');
1168                 out.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess))));
1169         }
1170
1171         GnuTLS::Profile* GetProfile() { return profile; }
1172         bool IsHandshakeDone() const { return (status == ISSL_HANDSHAKEN); }
1173 };
1174
1175 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)
1176 {
1177 #ifndef GNUTLS_NEW_CERT_CALLBACK_API
1178         st->type = GNUTLS_CRT_X509;
1179 #else
1180         st->cert_type = GNUTLS_CRT_X509;
1181         st->key_type = GNUTLS_PRIVKEY_X509;
1182 #endif
1183         StreamSocket* sock = reinterpret_cast<StreamSocket*>(gnutls_transport_get_ptr(sess));
1184         GnuTLS::X509Credentials& cred = static_cast<GnuTLSIOHook*>(sock->GetIOHook())->GetProfile()->GetX509Credentials();
1185
1186         st->ncerts = cred.certs.size();
1187         st->cert.x509 = cred.certs.raw();
1188         st->key.x509 = cred.key.get();
1189         st->deinit_all = 0;
1190
1191         return 0;
1192 }
1193
1194 class GnuTLSIOHookProvider : public refcountbase, public IOHookProvider
1195 {
1196         reference<GnuTLS::Profile> profile;
1197
1198  public:
1199         GnuTLSIOHookProvider(Module* mod, reference<GnuTLS::Profile>& prof)
1200                 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
1201                 , profile(prof)
1202         {
1203                 ServerInstance->Modules->AddService(*this);
1204         }
1205
1206         ~GnuTLSIOHookProvider()
1207         {
1208                 ServerInstance->Modules->DelService(*this);
1209         }
1210
1211         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
1212         {
1213                 new GnuTLSIOHook(this, sock, GNUTLS_SERVER, profile);
1214         }
1215
1216         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
1217         {
1218                 new GnuTLSIOHook(this, sock, GNUTLS_CLIENT, profile);
1219         }
1220 };
1221
1222 class ModuleSSLGnuTLS : public Module
1223 {
1224         typedef std::vector<reference<GnuTLSIOHookProvider> > ProfileList;
1225
1226         // First member of the class, gets constructed first and destructed last
1227         GnuTLS::Init libinit;
1228         RandGen randhandler;
1229         ProfileList profiles;
1230
1231         void ReadProfiles()
1232         {
1233                 // First, store all profiles in a new, temporary container. If no problems occur, swap the two
1234                 // containers; this way if something goes wrong we can go back and continue using the current profiles,
1235                 // avoiding unpleasant situations where no new SSL connections are possible.
1236                 ProfileList newprofiles;
1237
1238                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
1239                 if (tags.first == tags.second)
1240                 {
1241                         // No <sslprofile> tags found, create a profile named "gnutls" from settings in the <gnutls> block
1242                         const std::string defname = "gnutls";
1243                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
1244                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found; using settings from the <gnutls> tag");
1245
1246                         try
1247                         {
1248                                 reference<GnuTLS::Profile> profile(GnuTLS::Profile::Create(defname, tag));
1249                                 newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1250                         }
1251                         catch (CoreException& ex)
1252                         {
1253                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
1254                         }
1255                 }
1256
1257                 for (ConfigIter i = tags.first; i != tags.second; ++i)
1258                 {
1259                         ConfigTag* tag = i->second;
1260                         if (tag->getString("provider") != "gnutls")
1261                                 continue;
1262
1263                         std::string name = tag->getString("name");
1264                         if (name.empty())
1265                         {
1266                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
1267                                 continue;
1268                         }
1269
1270                         reference<GnuTLS::Profile> profile;
1271                         try
1272                         {
1273                                 profile = GnuTLS::Profile::Create(name, tag);
1274                         }
1275                         catch (CoreException& ex)
1276                         {
1277                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
1278                         }
1279
1280                         newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1281                 }
1282
1283                 // New profiles are ok, begin using them
1284                 // Old profiles are deleted when their refcount drops to zero
1285                 profiles.swap(newprofiles);
1286         }
1287
1288  public:
1289         ModuleSSLGnuTLS()
1290         {
1291 #ifndef GNUTLS_HAS_RND
1292                 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
1293 #endif
1294         }
1295
1296         void init() CXX11_OVERRIDE
1297         {
1298                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "GnuTLS lib version %s module was compiled for " GNUTLS_VERSION, gnutls_check_version(NULL));
1299                 ReadProfiles();
1300                 ServerInstance->GenRandom = &randhandler;
1301         }
1302
1303         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
1304         {
1305                 if(param != "ssl")
1306                         return;
1307
1308                 try
1309                 {
1310                         ReadProfiles();
1311                 }
1312                 catch (ModuleException& ex)
1313                 {
1314                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
1315                 }
1316         }
1317
1318         ~ModuleSSLGnuTLS()
1319         {
1320                 ServerInstance->GenRandom = &ServerInstance->HandleGenRandom;
1321         }
1322
1323         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
1324         {
1325                 if(target_type == TYPE_USER)
1326                 {
1327                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
1328
1329                         if (user && user->eh.GetIOHook() && user->eh.GetIOHook()->prov->creator == this)
1330                         {
1331                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
1332                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
1333                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
1334                         }
1335                 }
1336         }
1337
1338         Version GetVersion() CXX11_OVERRIDE
1339         {
1340                 return Version("Provides SSL support for clients", VF_VENDOR);
1341         }
1342
1343         void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
1344         {
1345                 IOHook* hook = user->eh.GetIOHook();
1346                 if (hook && hook->prov->creator == this)
1347                         static_cast<GnuTLSIOHook*>(hook)->TellCiphersAndFingerprint(user);
1348         }
1349
1350         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
1351         {
1352                 if ((user->eh.GetIOHook()) && (user->eh.GetIOHook()->prov->creator == this))
1353                 {
1354                         GnuTLSIOHook* iohook = static_cast<GnuTLSIOHook*>(user->eh.GetIOHook());
1355                         if (!iohook->IsHandshakeDone())
1356                                 return MOD_RES_DENY;
1357                 }
1358
1359                 return MOD_RES_PASSTHRU;
1360         }
1361 };
1362
1363 MODULE_INIT(ModuleSSLGnuTLS)