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                 /** True to request a client certificate as a server
 587                  */
 588                 const bool requestclientcert;
 589
 590                 Profile(const std::string& profilename, const std::string& certstr, const std::string& keystr,
 591                                 std::auto_ptr<DHParams>& DH, unsigned int mindh, const std::string& hashstr,
 592                                 const std::string& priostr, std::auto_ptr<X509CertList>& CA, std::auto_ptr<X509CRL>& CRL,
 593                                 unsigned int recsize, bool Requestclientcert)
 594                         : name(profilename)
 595                         , x509cred(certstr, keystr)
 596                         , min_dh_bits(mindh)
 597                         , hash(hashstr)
 598                         , priority(priostr)
 599                         , outrecsize(recsize)
 600                         , requestclientcert(Requestclientcert)
 601                 {
 602                         x509cred.SetDH(DH);
 603                         x509cred.SetCA(CA, CRL);
 604                 }
 605
 606                 static std::string ReadFile(const std::string& filename)
 607                 {
 608                         FileReader reader(filename);
 609                         std::string ret = reader.GetString();
 610                         if (ret.empty())
 611                                 throw Exception("Cannot read file " + filename);
 612                         return ret;
 613                 }
 614
 615                 static std::string GetPrioStr(const std::string& profilename, ConfigTag* tag)
 616                 {
 617                         // Use default priority string if this tag does not specify one
 618                         std::string priostr = GnuTLS::Priority::GetDefault();
 619                         bool found = tag->readString("priority", priostr);
 620                         // 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
 621                         if (!tag->getBool("strictpriority", found))
 622                         {
 623                                 std::string stripped = GnuTLS::Priority::RemoveUnknownTokens(priostr);
 624                                 if (stripped.empty())
 625                                 {
 626                                         // Stripping failed, act as if a prio string wasn't set
 627                                         stripped = GnuTLS::Priority::RemoveUnknownTokens(GnuTLS::Priority::GetDefault());
 628                                         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());
 629                                 }
 630                                 else if ((found) && (stripped != priostr))
 631                                 {
 632                                         // Prio string was set in the config and we ended up with something that works but different
 633                                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Priority string for profile \"%s\" contains unknown tokens, stripped to \"%s\"", profilename.c_str(), stripped.c_str());
 634                                 }
 635                                 priostr.swap(stripped);
 636                         }
 637                         return priostr;
 638                 }
 639
 640          public:
 641                 static reference<Profile> Create(const std::string& profilename, ConfigTag* tag)
 642                 {
 643                         std::string certstr = ReadFile(tag->getString("certfile", "cert.pem"));
 644                         std::string keystr = ReadFile(tag->getString("keyfile", "key.pem"));
 645
 646                         std::auto_ptr<DHParams> dh = DHParams::Import(ReadFile(tag->getString("dhfile", "dhparams.pem")));
 647
 648                         std::string priostr = GetPrioStr(profilename, tag);
 649                         unsigned int mindh = tag->getInt("mindhbits", 1024);
 650                         std::string hashstr = tag->getString("hash", "md5");
 651
 652                         // Load trusted CA and revocation list, if set
 653                         std::auto_ptr<X509CertList> ca;
 654                         std::auto_ptr<X509CRL> crl;
 655                         std::string filename = tag->getString("cafile");
 656                         if (!filename.empty())
 657                         {
 658                                 ca.reset(new X509CertList(ReadFile(filename)));
 659
 660                                 filename = tag->getString("crlfile");
 661                                 if (!filename.empty())
 662                                         crl.reset(new X509CRL(ReadFile(filename)));
 663                         }
 664
 665 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 666                         // If cork support is available outrecsize represents the (rough) max amount of data we give GnuTLS while corked
 667                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512);
 668 #else
 669                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512, 16384);
 670 #endif
 671
 672                         const bool requestclientcert = tag->getBool("requestclientcert", true);
 673
 674                         return new Profile(profilename, certstr, keystr, dh, mindh, hashstr, priostr, ca, crl, outrecsize, requestclientcert);
 675                 }
 676
 677                 /** Set up the given session with the settings in this profile
 678                  */
 679                 void SetupSession(gnutls_session_t sess)
 680                 {
 681                         priority.SetupSession(sess);
 682                         x509cred.SetupSession(sess);
 683                         gnutls_dh_set_prime_bits(sess, min_dh_bits);
 684
 685                         // Request client certificate if enabled and we are a server, no-op if we're a client
 686                         if (requestclientcert)
 687                                 gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
 688                 }
 689
 690                 const std::string& GetName() const { return name; }
 691                 X509Credentials& GetX509Credentials() { return x509cred; }
 692                 gnutls_digest_algorithm_t GetHash() const { return hash.get(); }
 693                 unsigned int GetOutgoingRecordSize() const { return outrecsize; }
 694         };
 695 }
 696
 697 class GnuTLSIOHook : public SSLIOHook
 698 {
 699  private:
 700         gnutls_session_t sess;
 701         issl_status status;
 702         reference<GnuTLS::Profile> profile;
 703 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 704         size_t gbuffersize;
 705 #endif
 706
 707         void CloseSession()
 708         {
 709                 if (this->sess)
 710                 {
 711                         gnutls_bye(this->sess, GNUTLS_SHUT_WR);
 712                         gnutls_deinit(this->sess);
 713                 }
 714                 sess = NULL;
 715                 certificate = NULL;
 716                 status = ISSL_NONE;
 717         }
 718
 719         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 720         int Handshake(StreamSocket* user)
 721         {
 722                 int ret = gnutls_handshake(this->sess);
 723
 724                 if (ret < 0)
 725                 {
 726                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 727                         {
 728                                 // Handshake needs resuming later, read() or write() would have blocked.
 729                                 this->status = ISSL_HANDSHAKING;
 730
 731                                 if (gnutls_record_get_direction(this->sess) == 0)
 732                                 {
 733                                         // gnutls_handshake() wants to read() again.
 734                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 735                                 }
 736                                 else
 737                                 {
 738                                         // gnutls_handshake() wants to write() again.
 739                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 740                                 }
 741
 742                                 return 0;
 743                         }
 744                         else
 745                         {
 746                                 user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret)));
 747                                 CloseSession();
 748                                 return -1;
 749                         }
 750                 }
 751                 else
 752                 {
 753                         // Change the seesion state
 754                         this->status = ISSL_HANDSHAKEN;
 755
 756                         VerifyCertificate();
 757
 758                         // Finish writing, if any left
 759                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 760
 761                         return 1;
 762                 }
 763         }
 764
 765         void VerifyCertificate()
 766         {
 767                 unsigned int certstatus;
 768                 const gnutls_datum_t* cert_list;
 769                 int ret;
 770                 unsigned int cert_list_size;
 771                 gnutls_x509_crt_t cert;
 772                 char str[512];
 773                 unsigned char digest[512];
 774                 size_t digest_size = sizeof(digest);
 775                 size_t name_size = sizeof(str);
 776                 ssl_cert* certinfo = new ssl_cert;
 777                 this->certificate = certinfo;
 778
 779                 /* This verification function uses the trusted CAs in the credentials
 780                  * structure. So you must have installed one or more CA certificates.
 781                  */
 782                 ret = gnutls_certificate_verify_peers2(this->sess, &certstatus);
 783
 784                 if (ret < 0)
 785                 {
 786                         certinfo->error = std::string(gnutls_strerror(ret));
 787                         return;
 788                 }
 789
 790                 certinfo->invalid = (certstatus & GNUTLS_CERT_INVALID);
 791                 certinfo->unknownsigner = (certstatus & GNUTLS_CERT_SIGNER_NOT_FOUND);
 792                 certinfo->revoked = (certstatus & GNUTLS_CERT_REVOKED);
 793                 certinfo->trusted = !(certstatus & GNUTLS_CERT_SIGNER_NOT_CA);
 794
 795                 /* Up to here the process is the same for X.509 certificates and
 796                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 797                  * be easily extended to work with openpgp keys as well.
 798                  */
 799                 if (gnutls_certificate_type_get(this->sess) != GNUTLS_CRT_X509)
 800                 {
 801                         certinfo->error = "No X509 keys sent";
 802                         return;
 803                 }
 804
 805                 ret = gnutls_x509_crt_init(&cert);
 806                 if (ret < 0)
 807                 {
 808                         certinfo->error = gnutls_strerror(ret);
 809                         return;
 810                 }
 811
 812                 cert_list_size = 0;
 813                 cert_list = gnutls_certificate_get_peers(this->sess, &cert_list_size);
 814                 if (cert_list == NULL)
 815                 {
 816                         certinfo->error = "No certificate was found";
 817                         goto info_done_dealloc;
 818                 }
 819
 820                 /* This is not a real world example, since we only check the first
 821                  * certificate in the given chain.
 822                  */
 823
 824                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 825                 if (ret < 0)
 826                 {
 827                         certinfo->error = gnutls_strerror(ret);
 828                         goto info_done_dealloc;
 829                 }
 830
 831                 if (gnutls_x509_crt_get_dn(cert, str, &name_size) == 0)
 832                 {
 833                         std::string& dn = certinfo->dn;
 834                         dn = str;
 835                         // Make sure there are no chars in the string that we consider invalid
 836                         if (dn.find_first_of("\r\n") != std::string::npos)
 837                                 dn.clear();
 838                 }
 839
 840                 name_size = sizeof(str);
 841                 if (gnutls_x509_crt_get_issuer_dn(cert, str, &name_size) == 0)
 842                 {
 843                         std::string& issuer = certinfo->issuer;
 844                         issuer = str;
 845                         if (issuer.find_first_of("\r\n") != std::string::npos)
 846                                 issuer.clear();
 847                 }
 848
 849                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, profile->GetHash(), digest, &digest_size)) < 0)
 850                 {
 851                         certinfo->error = gnutls_strerror(ret);
 852                 }
 853                 else
 854                 {
 855                         certinfo->fingerprint = BinToHex(digest, digest_size);
 856                 }
 857
 858                 /* Beware here we do not check for errors.
 859                  */
 860                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 861                 {
 862                         certinfo->error = "Not activated, or expired certificate";
 863                 }
 864
 865 info_done_dealloc:
 866                 gnutls_x509_crt_deinit(cert);
 867         }
 868
 869         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 870         int PrepareIO(StreamSocket* sock)
 871         {
 872                 if (status == ISSL_HANDSHAKEN)
 873                         return 1;
 874                 else if (status == ISSL_HANDSHAKING)
 875                 {
 876                         // The handshake isn't finished, try to finish it
 877                         return Handshake(sock);
 878                 }
 879
 880                 CloseSession();
 881                 sock->SetError("No SSL session");
 882                 return -1;
 883         }
 884
 885 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 886         int FlushBuffer(StreamSocket* sock)
 887         {
 888                 // If GnuTLS has some data buffered, write it
 889                 if (gbuffersize)
 890                         return HandleWriteRet(sock, gnutls_record_uncork(this->sess, 0));
 891                 return 1;
 892         }
 893 #endif
 894
 895         int HandleWriteRet(StreamSocket* sock, int ret)
 896         {
 897                 if (ret > 0)
 898                 {
 899 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 900                         gbuffersize -= ret;
 901                         if (gbuffersize)
 902                         {
 903                                 SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 904                                 return 0;
 905                         }
 906 #endif
 907                         return ret;
 908                 }
 909                 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
 910                 {
 911                         SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 912                         return 0;
 913                 }
 914                 else // (ret < 0)
 915                 {
 916                         sock->SetError(gnutls_strerror(ret));
 917                         CloseSession();
 918                         return -1;
 919                 }
 920         }
 921
 922         static const char* UnknownIfNULL(const char* str)
 923         {
 924                 return str ? str : "UNKNOWN";
 925         }
 926
 927         static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size)
 928         {
 929                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 930 #ifdef _WIN32
 931                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 932 #endif
 933
 934                 if (sock->GetEventMask() & FD_READ_WILL_BLOCK)
 935                 {
 936 #ifdef _WIN32
 937                         gnutls_transport_set_errno(session->sess, EAGAIN);
 938 #else
 939                         errno = EAGAIN;
 940 #endif
 941                         return -1;
 942                 }
 943
 944                 int rv = SocketEngine::Recv(sock, reinterpret_cast<char *>(buffer), size, 0);
 945
 946 #ifdef _WIN32
 947                 if (rv < 0)
 948                 {
 949                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
 950                          * and then set errno appropriately.
 951                          * The gnutls library may also have a different errno variable than us, see
 952                          * gnutls_transport_set_errno(3).
 953                          */
 954                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 955                 }
 956 #endif
 957
 958                 if (rv < (int)size)
 959                         SocketEngine::ChangeEventMask(sock, FD_READ_WILL_BLOCK);
 960                 return rv;
 961         }
 962
 963 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 964         static ssize_t VectorPush(gnutls_transport_ptr_t transportptr, const giovec_t* iov, int iovcnt)
 965         {
 966                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(transportptr);
 967 #ifdef _WIN32
 968                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 969 #endif
 970
 971                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 972                 {
 973 #ifdef _WIN32
 974                         gnutls_transport_set_errno(session->sess, EAGAIN);
 975 #else
 976                         errno = EAGAIN;
 977 #endif
 978                         return -1;
 979                 }
 980
 981                 // Cast the giovec_t to iovec not to IOVector so the correct function is called on Windows
 982                 int ret = SocketEngine::WriteV(sock, reinterpret_cast<const iovec*>(iov), iovcnt);
 983 #ifdef _WIN32
 984                 // See the function above for more info about the usage of gnutls_transport_set_errno() on Windows
 985                 if (ret < 0)
 986                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 987 #endif
 988
 989                 int size = 0;
 990                 for (int i = 0; i < iovcnt; i++)
 991                         size += iov[i].iov_len;
 992
 993                 if (ret < size)
 994                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
 995                 return ret;
 996         }
 997
 998 #else // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 999         static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size)
1000         {
1001                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
1002 #ifdef _WIN32
1003                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
1004 #endif
1005
1006                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
1007                 {
1008 #ifdef _WIN32
1009                         gnutls_transport_set_errno(session->sess, EAGAIN);
1010 #else
1011                         errno = EAGAIN;
1012 #endif
1013                         return -1;
1014                 }
1015
1016                 int rv = SocketEngine::Send(sock, reinterpret_cast<const char *>(buffer), size, 0);
1017
1018 #ifdef _WIN32
1019                 if (rv < 0)
1020                 {
1021                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
1022                          * and then set errno appropriately.
1023                          * The gnutls library may also have a different errno variable than us, see
1024                          * gnutls_transport_set_errno(3).
1025                          */
1026                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
1027                 }
1028 #endif
1029
1030                 if (rv < (int)size)
1031                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
1032                 return rv;
1033         }
1034 #endif // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1035
1036  public:
1037         GnuTLSIOHook(IOHookProvider* hookprov, StreamSocket* sock, inspircd_gnutls_session_init_flags_t flags, const reference<GnuTLS::Profile>& sslprofile)
1038                 : SSLIOHook(hookprov)
1039                 , sess(NULL)
1040                 , status(ISSL_NONE)
1041                 , profile(sslprofile)
1042 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1043                 , gbuffersize(0)
1044 #endif
1045         {
1046                 gnutls_init(&sess, flags);
1047                 gnutls_transport_set_ptr(sess, reinterpret_cast<gnutls_transport_ptr_t>(sock));
1048 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1049                 gnutls_transport_set_vec_push_function(sess, VectorPush);
1050 #else
1051                 gnutls_transport_set_push_function(sess, gnutls_push_wrapper);
1052 #endif
1053                 gnutls_transport_set_pull_function(sess, gnutls_pull_wrapper);
1054                 profile->SetupSession(sess);
1055
1056                 sock->AddIOHook(this);
1057                 Handshake(sock);
1058         }
1059
1060         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
1061         {
1062                 CloseSession();
1063         }
1064
1065         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
1066         {
1067                 // Finish handshake if needed
1068                 int prepret = PrepareIO(user);
1069                 if (prepret <= 0)
1070                         return prepret;
1071
1072                 // If we resumed the handshake then this->status will be ISSL_HANDSHAKEN.
1073                 {
1074                         GnuTLS::DataReader reader(sess);
1075                         int ret = reader.ret();
1076                         if (ret > 0)
1077                         {
1078                                 reader.appendto(recvq);
1079                                 return 1;
1080                         }
1081                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
1082                         {
1083                                 return 0;
1084                         }
1085                         else if (ret == 0)
1086                         {
1087                                 user->SetError("Connection closed");
1088                                 CloseSession();
1089                                 return -1;
1090                         }
1091                         else
1092                         {
1093                                 user->SetError(gnutls_strerror(ret));
1094                                 CloseSession();
1095                                 return -1;
1096                         }
1097                 }
1098         }
1099
1100         int OnStreamSocketWrite(StreamSocket* user, StreamSocket::SendQueue& sendq) CXX11_OVERRIDE
1101         {
1102                 // Finish handshake if needed
1103                 int prepret = PrepareIO(user);
1104                 if (prepret <= 0)
1105                         return prepret;
1106
1107                 // Session is ready for transferring application data
1108
1109 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1110                 while (true)
1111                 {
1112                         // If there is something in the GnuTLS buffer try to send() it
1113                         int ret = FlushBuffer(user);
1114                         if (ret <= 0)
1115                                 return ret; // Couldn't flush entire buffer, retry later (or close on error)
1116
1117                         // GnuTLS buffer is empty, if the sendq is empty as well then break to set FD_WANT_NO_WRITE
1118                         if (sendq.empty())
1119                                 break;
1120
1121                         // GnuTLS buffer is empty but sendq is not, begin sending data from the sendq
1122                         gnutls_record_cork(this->sess);
1123                         while ((!sendq.empty()) && (gbuffersize < profile->GetOutgoingRecordSize()))
1124                         {
1125                                 const StreamSocket::SendQueue::Element& elem = sendq.front();
1126                                 gbuffersize += elem.length();
1127                                 ret = gnutls_record_send(this->sess, elem.data(), elem.length());
1128                                 if (ret < 0)
1129                                 {
1130                                         CloseSession();
1131                                         return -1;
1132                                 }
1133                                 sendq.pop_front();
1134                         }
1135                 }
1136 #else
1137                 int ret = 0;
1138
1139                 while (!sendq.empty())
1140                 {
1141                         FlattenSendQueue(sendq, profile->GetOutgoingRecordSize());
1142                         const StreamSocket::SendQueue::Element& buffer = sendq.front();
1143                         ret = HandleWriteRet(user, gnutls_record_send(this->sess, buffer.data(), buffer.length()));
1144
1145                         if (ret <= 0)
1146                                 return ret;
1147                         else if (ret < (int)buffer.length())
1148                         {
1149                                 sendq.erase_front(ret);
1150                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
1151                                 return 0;
1152                         }
1153
1154                         // Wrote entire record, continue sending
1155                         sendq.pop_front();
1156                 }
1157 #endif
1158
1159                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_WRITE);
1160                 return 1;
1161         }
1162
1163         void GetCiphersuite(std::string& out) const CXX11_OVERRIDE
1164         {
1165                 if (!IsHandshakeDone())
1166                         return;
1167                 out.append(UnknownIfNULL(gnutls_protocol_get_name(gnutls_protocol_get_version(sess)))).push_back('-');
1168                 out.append(UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess)))).push_back('-');
1169                 out.append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).push_back('-');
1170                 out.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess))));
1171         }
1172
1173         GnuTLS::Profile* GetProfile() { return profile; }
1174         bool IsHandshakeDone() const { return (status == ISSL_HANDSHAKEN); }
1175 };
1176
1177 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)
1178 {
1179 #ifndef GNUTLS_NEW_CERT_CALLBACK_API
1180         st->type = GNUTLS_CRT_X509;
1181 #else
1182         st->cert_type = GNUTLS_CRT_X509;
1183         st->key_type = GNUTLS_PRIVKEY_X509;
1184 #endif
1185         StreamSocket* sock = reinterpret_cast<StreamSocket*>(gnutls_transport_get_ptr(sess));
1186         GnuTLS::X509Credentials& cred = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod))->GetProfile()->GetX509Credentials();
1187
1188         st->ncerts = cred.certs.size();
1189         st->cert.x509 = cred.certs.raw();
1190         st->key.x509 = cred.key.get();
1191         st->deinit_all = 0;
1192
1193         return 0;
1194 }
1195
1196 class GnuTLSIOHookProvider : public refcountbase, public IOHookProvider
1197 {
1198         reference<GnuTLS::Profile> profile;
1199
1200  public:
1201         GnuTLSIOHookProvider(Module* mod, reference<GnuTLS::Profile>& prof)
1202                 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
1203                 , profile(prof)
1204         {
1205                 ServerInstance->Modules->AddService(*this);
1206         }
1207
1208         ~GnuTLSIOHookProvider()
1209         {
1210                 ServerInstance->Modules->DelService(*this);
1211         }
1212
1213         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
1214         {
1215                 new GnuTLSIOHook(this, sock, GNUTLS_SERVER, profile);
1216         }
1217
1218         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
1219         {
1220                 new GnuTLSIOHook(this, sock, GNUTLS_CLIENT, profile);
1221         }
1222 };
1223
1224 class ModuleSSLGnuTLS : public Module
1225 {
1226         typedef std::vector<reference<GnuTLSIOHookProvider> > ProfileList;
1227
1228         // First member of the class, gets constructed first and destructed last
1229         GnuTLS::Init libinit;
1230         RandGen randhandler;
1231         ProfileList profiles;
1232
1233         void ReadProfiles()
1234         {
1235                 // First, store all profiles in a new, temporary container. If no problems occur, swap the two
1236                 // containers; this way if something goes wrong we can go back and continue using the current profiles,
1237                 // avoiding unpleasant situations where no new SSL connections are possible.
1238                 ProfileList newprofiles;
1239
1240                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
1241                 if (tags.first == tags.second)
1242                 {
1243                         // No <sslprofile> tags found, create a profile named "gnutls" from settings in the <gnutls> block
1244                         const std::string defname = "gnutls";
1245                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
1246                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found; using settings from the <gnutls> tag");
1247
1248                         try
1249                         {
1250                                 reference<GnuTLS::Profile> profile(GnuTLS::Profile::Create(defname, tag));
1251                                 newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1252                         }
1253                         catch (CoreException& ex)
1254                         {
1255                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
1256                         }
1257                 }
1258
1259                 for (ConfigIter i = tags.first; i != tags.second; ++i)
1260                 {
1261                         ConfigTag* tag = i->second;
1262                         if (tag->getString("provider") != "gnutls")
1263                                 continue;
1264
1265                         std::string name = tag->getString("name");
1266                         if (name.empty())
1267                         {
1268                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
1269                                 continue;
1270                         }
1271
1272                         reference<GnuTLS::Profile> profile;
1273                         try
1274                         {
1275                                 profile = GnuTLS::Profile::Create(name, tag);
1276                         }
1277                         catch (CoreException& ex)
1278                         {
1279                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
1280                         }
1281
1282                         newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1283                 }
1284
1285                 // New profiles are ok, begin using them
1286                 // Old profiles are deleted when their refcount drops to zero
1287                 profiles.swap(newprofiles);
1288         }
1289
1290  public:
1291         ModuleSSLGnuTLS()
1292         {
1293 #ifndef GNUTLS_HAS_RND
1294                 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
1295 #endif
1296                 thismod = this;
1297         }
1298
1299         void init() CXX11_OVERRIDE
1300         {
1301                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "GnuTLS lib version %s module was compiled for " GNUTLS_VERSION, gnutls_check_version(NULL));
1302                 ReadProfiles();
1303                 ServerInstance->GenRandom = &randhandler;
1304         }
1305
1306         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
1307         {
1308                 if(param != "ssl")
1309                         return;
1310
1311                 try
1312                 {
1313                         ReadProfiles();
1314                 }
1315                 catch (ModuleException& ex)
1316                 {
1317                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
1318                 }
1319         }
1320
1321         ~ModuleSSLGnuTLS()
1322         {
1323                 ServerInstance->GenRandom = &ServerInstance->HandleGenRandom;
1324         }
1325
1326         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
1327         {
1328                 if(target_type == TYPE_USER)
1329                 {
1330                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
1331
1332                         if ((user) && (user->eh.GetModHook(this)))
1333                         {
1334                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
1335                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
1336                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
1337                         }
1338                 }
1339         }
1340
1341         Version GetVersion() CXX11_OVERRIDE
1342         {
1343                 return Version("Provides SSL support for clients", VF_VENDOR);
1344         }
1345
1346         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
1347         {
1348                 const GnuTLSIOHook* const iohook = static_cast<GnuTLSIOHook*>(user->eh.GetModHook(this));
1349                 if ((iohook) && (!iohook->IsHandshakeDone()))
1350                         return MOD_RES_DENY;
1351                 return MOD_RES_PASSTHRU;
1352         }
1353 };
1354
1355 MODULE_INIT(ModuleSSLGnuTLS)