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-28.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 class RandGen : public HandlerBase2<void, char*, size_t>
 105 {
 106  public:
 107         void Call(char* buffer, size_t len)
 108         {
 109 #ifdef GNUTLS_HAS_RND
 110                 gnutls_rnd(GNUTLS_RND_RANDOM, buffer, len);
 111 #else
 112                 gcry_randomize(buffer, len, GCRY_STRONG_RANDOM);
 113 #endif
 114         }
 115 };
 116
 117 namespace GnuTLS
 118 {
 119         class Init
 120         {
 121          public:
 122                 Init() { gnutls_global_init(); }
 123                 ~Init() { gnutls_global_deinit(); }
 124         };
 125
 126         class Exception : public ModuleException
 127         {
 128          public:
 129                 Exception(const std::string& reason)
 130                         : ModuleException(reason) { }
 131         };
 132
 133         void ThrowOnError(int errcode, const char* msg)
 134         {
 135                 if (errcode < 0)
 136                 {
 137                         std::string reason = msg;
 138                         reason.append(" :").append(gnutls_strerror(errcode));
 139                         throw Exception(reason);
 140                 }
 141         }
 142
 143         /** Used to create a gnutls_datum_t* from a std::string
 144          */
 145         class Datum
 146         {
 147                 gnutls_datum_t datum;
 148
 149          public:
 150                 Datum(const std::string& dat)
 151                 {
 152                         datum.data = (unsigned char*)dat.data();
 153                         datum.size = static_cast<unsigned int>(dat.length());
 154                 }
 155
 156                 const gnutls_datum_t* get() const { return &datum; }
 157         };
 158
 159         class Hash
 160         {
 161                 gnutls_digest_algorithm_t hash;
 162
 163          public:
 164                 // Nothing to deallocate, constructor may throw freely
 165                 Hash(const std::string& hashname)
 166                 {
 167                         // As older versions of gnutls can't do this, let's disable it where needed.
 168 #ifdef GNUTLS_HAS_MAC_GET_ID
 169                         // As gnutls_digest_algorithm_t and gnutls_mac_algorithm_t are mapped 1:1, we can do this
 170                         // There is no gnutls_dig_get_id() at the moment, but it may come later
 171                         hash = (gnutls_digest_algorithm_t)gnutls_mac_get_id(hashname.c_str());
 172                         if (hash == GNUTLS_DIG_UNKNOWN)
 173                                 throw Exception("Unknown hash type " + hashname);
 174
 175                         // Check if the user is giving us something that is a valid MAC but not digest
 176                         gnutls_hash_hd_t is_digest;
 177                         if (gnutls_hash_init(&is_digest, hash) < 0)
 178                                 throw Exception("Unknown hash type " + hashname);
 179                         gnutls_hash_deinit(is_digest, NULL);
 180 #else
 181                         if (hashname == "md5")
 182                                 hash = GNUTLS_DIG_MD5;
 183                         else if (hashname == "sha1")
 184                                 hash = GNUTLS_DIG_SHA1;
 185 #ifdef INSPIRCD_GNUTLS_ENABLE_SHA256_FINGERPRINT
 186                         else if (hashname == "sha256")
 187                                 hash = GNUTLS_DIG_SHA256;
 188 #endif
 189                         else
 190                                 throw Exception("Unknown hash type " + hashname);
 191 #endif
 192                 }
 193
 194                 gnutls_digest_algorithm_t get() const { return hash; }
 195         };
 196
 197         class DHParams
 198         {
 199                 gnutls_dh_params_t dh_params;
 200
 201                 DHParams()
 202                 {
 203                         ThrowOnError(gnutls_dh_params_init(&dh_params), "gnutls_dh_params_init() failed");
 204                 }
 205
 206          public:
 207                 /** Import */
 208                 static std::auto_ptr<DHParams> Import(const std::string& dhstr)
 209                 {
 210                         std::auto_ptr<DHParams> dh(new DHParams);
 211                         int ret = gnutls_dh_params_import_pkcs3(dh->dh_params, Datum(dhstr).get(), GNUTLS_X509_FMT_PEM);
 212                         ThrowOnError(ret, "Unable to import DH params");
 213                         return dh;
 214                 }
 215
 216                 ~DHParams()
 217                 {
 218                         gnutls_dh_params_deinit(dh_params);
 219                 }
 220
 221                 const gnutls_dh_params_t& get() const { return dh_params; }
 222         };
 223
 224         class X509Key
 225         {
 226                 /** Ensure that the key is deinited in case the constructor of X509Key throws
 227                  */
 228                 class RAIIKey
 229                 {
 230                  public:
 231                         gnutls_x509_privkey_t key;
 232
 233                         RAIIKey()
 234                         {
 235                                 ThrowOnError(gnutls_x509_privkey_init(&key), "gnutls_x509_privkey_init() failed");
 236                         }
 237
 238                         ~RAIIKey()
 239                         {
 240                                 gnutls_x509_privkey_deinit(key);
 241                         }
 242                 } key;
 243
 244          public:
 245                 /** Import */
 246                 X509Key(const std::string& keystr)
 247                 {
 248                         int ret = gnutls_x509_privkey_import(key.key, Datum(keystr).get(), GNUTLS_X509_FMT_PEM);
 249                         ThrowOnError(ret, "Unable to import private key");
 250                 }
 251
 252                 gnutls_x509_privkey_t& get() { return key.key; }
 253         };
 254
 255         class X509CertList
 256         {
 257                 std::vector<gnutls_x509_crt_t> certs;
 258
 259          public:
 260                 /** Import */
 261                 X509CertList(const std::string& certstr)
 262                 {
 263                         unsigned int certcount = 3;
 264                         certs.resize(certcount);
 265                         Datum datum(certstr);
 266
 267                         int ret = gnutls_x509_crt_list_import(raw(), &certcount, datum.get(), GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 268                         if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
 269                         {
 270                                 // the buffer wasn't big enough to hold all certs but gnutls changed certcount to the number of available certs,
 271                                 // try again with a bigger buffer
 272                                 certs.resize(certcount);
 273                                 ret = gnutls_x509_crt_list_import(raw(), &certcount, datum.get(), GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 274                         }
 275
 276                         ThrowOnError(ret, "Unable to load certificates");
 277
 278                         // Resize the vector to the actual number of certs because we rely on its size being correct
 279                         // when deallocating the certs
 280                         certs.resize(certcount);
 281                 }
 282
 283                 ~X509CertList()
 284                 {
 285                         for (std::vector<gnutls_x509_crt_t>::iterator i = certs.begin(); i != certs.end(); ++i)
 286                                 gnutls_x509_crt_deinit(*i);
 287                 }
 288
 289                 gnutls_x509_crt_t* raw() { return &certs[0]; }
 290                 unsigned int size() const { return certs.size(); }
 291         };
 292
 293         class X509CRL : public refcountbase
 294         {
 295                 class RAIICRL
 296                 {
 297                  public:
 298                         gnutls_x509_crl_t crl;
 299
 300                         RAIICRL()
 301                         {
 302                                 ThrowOnError(gnutls_x509_crl_init(&crl), "gnutls_x509_crl_init() failed");
 303                         }
 304
 305                         ~RAIICRL()
 306                         {
 307                                 gnutls_x509_crl_deinit(crl);
 308                         }
 309                 } crl;
 310
 311          public:
 312                 /** Import */
 313                 X509CRL(const std::string& crlstr)
 314                 {
 315                         int ret = gnutls_x509_crl_import(get(), Datum(crlstr).get(), GNUTLS_X509_FMT_PEM);
 316                         ThrowOnError(ret, "Unable to load certificate revocation list");
 317                 }
 318
 319                 gnutls_x509_crl_t& get() { return crl.crl; }
 320         };
 321
 322 #ifdef GNUTLS_NEW_PRIO_API
 323         class Priority
 324         {
 325                 gnutls_priority_t priority;
 326
 327          public:
 328                 Priority(const std::string& priorities)
 329                 {
 330                         // Try to set the priorities for ciphers, kex methods etc. to the user supplied string
 331                         // If the user did not supply anything then the string is already set to "NORMAL"
 332                         const char* priocstr = priorities.c_str();
 333                         const char* prioerror;
 334
 335                         int ret = gnutls_priority_init(&priority, priocstr, &prioerror);
 336                         if (ret < 0)
 337                         {
 338                                 // gnutls did not understand the user supplied string
 339                                 throw Exception("Unable to initialize priorities to \"" + priorities + "\": " + gnutls_strerror(ret) + " Syntax error at position " + ConvToStr((unsigned int) (prioerror - priocstr)));
 340                         }
 341                 }
 342
 343                 ~Priority()
 344                 {
 345                         gnutls_priority_deinit(priority);
 346                 }
 347
 348                 void SetupSession(gnutls_session_t sess)
 349                 {
 350                         gnutls_priority_set(sess, priority);
 351                 }
 352
 353                 static const char* GetDefault()
 354                 {
 355                         return "NORMAL:%SERVER_PRECEDENCE:-VERS-SSL3.0";
 356                 }
 357
 358                 static std::string RemoveUnknownTokens(const std::string& prio)
 359                 {
 360                         std::string ret;
 361                         irc::sepstream ss(prio, ':');
 362                         for (std::string token; ss.GetToken(token); )
 363                         {
 364                                 // Save current position so we can revert later if needed
 365                                 const std::string::size_type prevpos = ret.length();
 366                                 // Append next token
 367                                 if (!ret.empty())
 368                                         ret.push_back(':');
 369                                 ret.append(token);
 370
 371                                 gnutls_priority_t test;
 372                                 if (gnutls_priority_init(&test, ret.c_str(), NULL) < 0)
 373                                 {
 374                                         // The new token broke the priority string, revert to the previously working one
 375                                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Priority string token not recognized: \"%s\"", token.c_str());
 376                                         ret.erase(prevpos);
 377                                 }
 378                                 else
 379                                 {
 380                                         // Worked
 381                                         gnutls_priority_deinit(test);
 382                                 }
 383                         }
 384                         return ret;
 385                 }
 386         };
 387 #else
 388         /** Dummy class, used when gnutls_priority_set() is not available
 389          */
 390         class Priority
 391         {
 392          public:
 393                 Priority(const std::string& priorities)
 394                 {
 395                         if (priorities != GetDefault())
 396                                 throw Exception("You've set a non-default priority string, but GnuTLS lacks support for it");
 397                 }
 398
 399                 static void SetupSession(gnutls_session_t sess)
 400                 {
 401                         // Always set the default priorities
 402                         gnutls_set_default_priority(sess);
 403                 }
 404
 405                 static const char* GetDefault()
 406                 {
 407                         return "NORMAL";
 408                 }
 409
 410                 static std::string RemoveUnknownTokens(const std::string& prio)
 411                 {
 412                         // We don't do anything here because only NORMAL is accepted
 413                         return prio;
 414                 }
 415         };
 416 #endif
 417
 418         class CertCredentials
 419         {
 420                 /** DH parameters associated with these credentials
 421                  */
 422                 std::auto_ptr<DHParams> dh;
 423
 424          protected:
 425                 gnutls_certificate_credentials_t cred;
 426
 427          public:
 428                 CertCredentials()
 429                 {
 430                         ThrowOnError(gnutls_certificate_allocate_credentials(&cred), "Cannot allocate certificate credentials");
 431                 }
 432
 433                 ~CertCredentials()
 434                 {
 435                         gnutls_certificate_free_credentials(cred);
 436                 }
 437
 438                 /** Associates these credentials with the session
 439                  */
 440                 void SetupSession(gnutls_session_t sess)
 441                 {
 442                         gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, cred);
 443                 }
 444
 445                 /** Set the given DH parameters to be used with these credentials
 446                  */
 447                 void SetDH(std::auto_ptr<DHParams>& DH)
 448                 {
 449                         dh = DH;
 450                         gnutls_certificate_set_dh_params(cred, dh->get());
 451                 }
 452         };
 453
 454         class X509Credentials : public CertCredentials
 455         {
 456                 /** Private key
 457                  */
 458                 X509Key key;
 459
 460                 /** Certificate list, presented to the peer
 461                  */
 462                 X509CertList certs;
 463
 464                 /** Trusted CA, may be NULL
 465                  */
 466                 std::auto_ptr<X509CertList> trustedca;
 467
 468                 /** Certificate revocation list, may be NULL
 469                  */
 470                 std::auto_ptr<X509CRL> crl;
 471
 472                 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);
 473
 474          public:
 475                 X509Credentials(const std::string& certstr, const std::string& keystr)
 476                         : key(keystr)
 477                         , certs(certstr)
 478                 {
 479                         // Throwing is ok here, the destructor of Credentials is called in that case
 480                         int ret = gnutls_certificate_set_x509_key(cred, certs.raw(), certs.size(), key.get());
 481                         ThrowOnError(ret, "Unable to set cert/key pair");
 482
 483 #ifdef GNUTLS_NEW_CERT_CALLBACK_API
 484                         gnutls_certificate_set_retrieve_function(cred, cert_callback);
 485 #else
 486                         gnutls_certificate_client_set_retrieve_function(cred, cert_callback);
 487 #endif
 488                 }
 489
 490                 /** Sets the trusted CA and the certificate revocation list
 491                  * to use when verifying certificates
 492                  */
 493                 void SetCA(std::auto_ptr<X509CertList>& certlist, std::auto_ptr<X509CRL>& CRL)
 494                 {
 495                         // Do nothing if certlist is NULL
 496                         if (certlist.get())
 497                         {
 498                                 int ret = gnutls_certificate_set_x509_trust(cred, certlist->raw(), certlist->size());
 499                                 ThrowOnError(ret, "gnutls_certificate_set_x509_trust() failed");
 500
 501                                 if (CRL.get())
 502                                 {
 503                                         ret = gnutls_certificate_set_x509_crl(cred, &CRL->get(), 1);
 504                                         ThrowOnError(ret, "gnutls_certificate_set_x509_crl() failed");
 505                                 }
 506
 507                                 trustedca = certlist;
 508                                 crl = CRL;
 509                         }
 510                 }
 511         };
 512
 513         class DataReader
 514         {
 515                 int retval;
 516 #ifdef INSPIRCD_GNUTLS_HAS_RECV_PACKET
 517                 gnutls_packet_t packet;
 518
 519          public:
 520                 DataReader(gnutls_session_t sess)
 521                 {
 522                         // Using the packet API avoids the final copy of the data which GnuTLS does if we supply
 523                         // our own buffer. Instead, we get the buffer containing the data from GnuTLS and copy it
 524                         // to the recvq directly from there in appendto().
 525                         retval = gnutls_record_recv_packet(sess, &packet);
 526                 }
 527
 528                 void appendto(std::string& recvq)
 529                 {
 530                         // Copy data from GnuTLS buffers to recvq
 531                         gnutls_datum_t datum;
 532                         gnutls_packet_get(packet, &datum, NULL);
 533                         recvq.append(reinterpret_cast<const char*>(datum.data), datum.size);
 534
 535                         gnutls_packet_deinit(packet);
 536                 }
 537 #else
 538                 char* const buffer;
 539
 540          public:
 541                 DataReader(gnutls_session_t sess)
 542                         : buffer(ServerInstance->GetReadBuffer())
 543                 {
 544                         // Read data from GnuTLS buffers into ReadBuffer
 545                         retval = gnutls_record_recv(sess, buffer, ServerInstance->Config->NetBufferSize);
 546                 }
 547
 548                 void appendto(std::string& recvq)
 549                 {
 550                         // Copy data from ReadBuffer to recvq
 551                         recvq.append(buffer, retval);
 552                 }
 553 #endif
 554
 555                 int ret() const { return retval; }
 556         };
 557
 558         class Profile : public refcountbase
 559         {
 560                 /** Name of this profile
 561                  */
 562                 const std::string name;
 563
 564                 /** X509 certificate(s) and key
 565                  */
 566                 X509Credentials x509cred;
 567
 568                 /** The minimum length in bits for the DH prime to be accepted as a client
 569                  */
 570                 unsigned int min_dh_bits;
 571
 572                 /** Hashing algorithm to use when generating certificate fingerprints
 573                  */
 574                 Hash hash;
 575
 576                 /** Priorities for ciphers, compression methods, etc.
 577                  */
 578                 Priority priority;
 579
 580                 /** Rough max size of records to send
 581                  */
 582                 const unsigned int outrecsize;
 583
 584                 Profile(const std::string& profilename, const std::string& certstr, const std::string& keystr,
 585                                 std::auto_ptr<DHParams>& DH, unsigned int mindh, const std::string& hashstr,
 586                                 const std::string& priostr, std::auto_ptr<X509CertList>& CA, std::auto_ptr<X509CRL>& CRL,
 587                                 unsigned int recsize)
 588                         : name(profilename)
 589                         , x509cred(certstr, keystr)
 590                         , min_dh_bits(mindh)
 591                         , hash(hashstr)
 592                         , priority(priostr)
 593                         , outrecsize(recsize)
 594                 {
 595                         x509cred.SetDH(DH);
 596                         x509cred.SetCA(CA, CRL);
 597                 }
 598
 599                 static std::string ReadFile(const std::string& filename)
 600                 {
 601                         FileReader reader(filename);
 602                         std::string ret = reader.GetString();
 603                         if (ret.empty())
 604                                 throw Exception("Cannot read file " + filename);
 605                         return ret;
 606                 }
 607
 608                 static std::string GetPrioStr(const std::string& profilename, ConfigTag* tag)
 609                 {
 610                         // Use default priority string if this tag does not specify one
 611                         std::string priostr = GnuTLS::Priority::GetDefault();
 612                         bool found = tag->readString("priority", priostr);
 613                         // 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
 614                         if (!tag->getBool("strictpriority", found))
 615                         {
 616                                 std::string stripped = GnuTLS::Priority::RemoveUnknownTokens(priostr);
 617                                 if (stripped.empty())
 618                                 {
 619                                         // Stripping failed, act as if a prio string wasn't set
 620                                         stripped = GnuTLS::Priority::RemoveUnknownTokens(GnuTLS::Priority::GetDefault());
 621                                         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());
 622                                 }
 623                                 else if ((found) && (stripped != priostr))
 624                                 {
 625                                         // Prio string was set in the config and we ended up with something that works but different
 626                                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Priority string for profile \"%s\" contains unknown tokens, stripped to \"%s\"", profilename.c_str(), stripped.c_str());
 627                                 }
 628                                 priostr.swap(stripped);
 629                         }
 630                         return priostr;
 631                 }
 632
 633          public:
 634                 static reference<Profile> Create(const std::string& profilename, ConfigTag* tag)
 635                 {
 636                         std::string certstr = ReadFile(tag->getString("certfile", "cert.pem"));
 637                         std::string keystr = ReadFile(tag->getString("keyfile", "key.pem"));
 638
 639                         std::auto_ptr<DHParams> dh = DHParams::Import(ReadFile(tag->getString("dhfile", "dhparams.pem")));
 640
 641                         std::string priostr = GetPrioStr(profilename, tag);
 642                         unsigned int mindh = tag->getInt("mindhbits", 1024);
 643                         std::string hashstr = tag->getString("hash", "md5");
 644
 645                         // Load trusted CA and revocation list, if set
 646                         std::auto_ptr<X509CertList> ca;
 647                         std::auto_ptr<X509CRL> crl;
 648                         std::string filename = tag->getString("cafile");
 649                         if (!filename.empty())
 650                         {
 651                                 ca.reset(new X509CertList(ReadFile(filename)));
 652
 653                                 filename = tag->getString("crlfile");
 654                                 if (!filename.empty())
 655                                         crl.reset(new X509CRL(ReadFile(filename)));
 656                         }
 657
 658 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 659                         // If cork support is available outrecsize represents the (rough) max amount of data we give GnuTLS while corked
 660                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512);
 661 #else
 662                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512, 16384);
 663 #endif
 664                         return new Profile(profilename, certstr, keystr, dh, mindh, hashstr, priostr, ca, crl, outrecsize);
 665                 }
 666
 667                 /** Set up the given session with the settings in this profile
 668                  */
 669                 void SetupSession(gnutls_session_t sess)
 670                 {
 671                         priority.SetupSession(sess);
 672                         x509cred.SetupSession(sess);
 673                         gnutls_dh_set_prime_bits(sess, min_dh_bits);
 674
 675                         // Request client certificate if we are a server, no-op if we're a client
 676                         gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
 677                 }
 678
 679                 const std::string& GetName() const { return name; }
 680                 X509Credentials& GetX509Credentials() { return x509cred; }
 681                 gnutls_digest_algorithm_t GetHash() const { return hash.get(); }
 682                 unsigned int GetOutgoingRecordSize() const { return outrecsize; }
 683         };
 684 }
 685
 686 class GnuTLSIOHook : public SSLIOHook
 687 {
 688  private:
 689         gnutls_session_t sess;
 690         issl_status status;
 691         reference<GnuTLS::Profile> profile;
 692 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 693         size_t gbuffersize;
 694 #endif
 695
 696         void CloseSession()
 697         {
 698                 if (this->sess)
 699                 {
 700                         gnutls_bye(this->sess, GNUTLS_SHUT_WR);
 701                         gnutls_deinit(this->sess);
 702                 }
 703                 sess = NULL;
 704                 certificate = NULL;
 705                 status = ISSL_NONE;
 706         }
 707
 708         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 709         int Handshake(StreamSocket* user)
 710         {
 711                 int ret = gnutls_handshake(this->sess);
 712
 713                 if (ret < 0)
 714                 {
 715                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 716                         {
 717                                 // Handshake needs resuming later, read() or write() would have blocked.
 718                                 this->status = ISSL_HANDSHAKING;
 719
 720                                 if (gnutls_record_get_direction(this->sess) == 0)
 721                                 {
 722                                         // gnutls_handshake() wants to read() again.
 723                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 724                                 }
 725                                 else
 726                                 {
 727                                         // gnutls_handshake() wants to write() again.
 728                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 729                                 }
 730
 731                                 return 0;
 732                         }
 733                         else
 734                         {
 735                                 user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret)));
 736                                 CloseSession();
 737                                 return -1;
 738                         }
 739                 }
 740                 else
 741                 {
 742                         // Change the seesion state
 743                         this->status = ISSL_HANDSHAKEN;
 744
 745                         VerifyCertificate();
 746
 747                         // Finish writing, if any left
 748                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 749
 750                         return 1;
 751                 }
 752         }
 753
 754         void VerifyCertificate()
 755         {
 756                 unsigned int certstatus;
 757                 const gnutls_datum_t* cert_list;
 758                 int ret;
 759                 unsigned int cert_list_size;
 760                 gnutls_x509_crt_t cert;
 761                 char str[512];
 762                 unsigned char digest[512];
 763                 size_t digest_size = sizeof(digest);
 764                 size_t name_size = sizeof(str);
 765                 ssl_cert* certinfo = new ssl_cert;
 766                 this->certificate = certinfo;
 767
 768                 /* This verification function uses the trusted CAs in the credentials
 769                  * structure. So you must have installed one or more CA certificates.
 770                  */
 771                 ret = gnutls_certificate_verify_peers2(this->sess, &certstatus);
 772
 773                 if (ret < 0)
 774                 {
 775                         certinfo->error = std::string(gnutls_strerror(ret));
 776                         return;
 777                 }
 778
 779                 certinfo->invalid = (certstatus & GNUTLS_CERT_INVALID);
 780                 certinfo->unknownsigner = (certstatus & GNUTLS_CERT_SIGNER_NOT_FOUND);
 781                 certinfo->revoked = (certstatus & GNUTLS_CERT_REVOKED);
 782                 certinfo->trusted = !(certstatus & GNUTLS_CERT_SIGNER_NOT_CA);
 783
 784                 /* Up to here the process is the same for X.509 certificates and
 785                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 786                  * be easily extended to work with openpgp keys as well.
 787                  */
 788                 if (gnutls_certificate_type_get(this->sess) != GNUTLS_CRT_X509)
 789                 {
 790                         certinfo->error = "No X509 keys sent";
 791                         return;
 792                 }
 793
 794                 ret = gnutls_x509_crt_init(&cert);
 795                 if (ret < 0)
 796                 {
 797                         certinfo->error = gnutls_strerror(ret);
 798                         return;
 799                 }
 800
 801                 cert_list_size = 0;
 802                 cert_list = gnutls_certificate_get_peers(this->sess, &cert_list_size);
 803                 if (cert_list == NULL)
 804                 {
 805                         certinfo->error = "No certificate was found";
 806                         goto info_done_dealloc;
 807                 }
 808
 809                 /* This is not a real world example, since we only check the first
 810                  * certificate in the given chain.
 811                  */
 812
 813                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 814                 if (ret < 0)
 815                 {
 816                         certinfo->error = gnutls_strerror(ret);
 817                         goto info_done_dealloc;
 818                 }
 819
 820                 if (gnutls_x509_crt_get_dn(cert, str, &name_size) == 0)
 821                 {
 822                         std::string& dn = certinfo->dn;
 823                         dn = str;
 824                         // Make sure there are no chars in the string that we consider invalid
 825                         if (dn.find_first_of("\r\n") != std::string::npos)
 826                                 dn.clear();
 827                 }
 828
 829                 name_size = sizeof(str);
 830                 if (gnutls_x509_crt_get_issuer_dn(cert, str, &name_size) == 0)
 831                 {
 832                         std::string& issuer = certinfo->issuer;
 833                         issuer = str;
 834                         if (issuer.find_first_of("\r\n") != std::string::npos)
 835                                 issuer.clear();
 836                 }
 837
 838                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, profile->GetHash(), digest, &digest_size)) < 0)
 839                 {
 840                         certinfo->error = gnutls_strerror(ret);
 841                 }
 842                 else
 843                 {
 844                         certinfo->fingerprint = BinToHex(digest, digest_size);
 845                 }
 846
 847                 /* Beware here we do not check for errors.
 848                  */
 849                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 850                 {
 851                         certinfo->error = "Not activated, or expired certificate";
 852                 }
 853
 854 info_done_dealloc:
 855                 gnutls_x509_crt_deinit(cert);
 856         }
 857
 858         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 859         int PrepareIO(StreamSocket* sock)
 860         {
 861                 if (status == ISSL_HANDSHAKEN)
 862                         return 1;
 863                 else if (status == ISSL_HANDSHAKING)
 864                 {
 865                         // The handshake isn't finished, try to finish it
 866                         return Handshake(sock);
 867                 }
 868
 869                 CloseSession();
 870                 sock->SetError("No SSL session");
 871                 return -1;
 872         }
 873
 874 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 875         int FlushBuffer(StreamSocket* sock)
 876         {
 877                 // If GnuTLS has some data buffered, write it
 878                 if (gbuffersize)
 879                         return HandleWriteRet(sock, gnutls_record_uncork(this->sess, 0));
 880                 return 1;
 881         }
 882 #endif
 883
 884         int HandleWriteRet(StreamSocket* sock, int ret)
 885         {
 886                 if (ret > 0)
 887                 {
 888 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 889                         gbuffersize -= ret;
 890                         if (gbuffersize)
 891                         {
 892                                 SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 893                                 return 0;
 894                         }
 895 #endif
 896                         return ret;
 897                 }
 898                 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
 899                 {
 900                         SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 901                         return 0;
 902                 }
 903                 else // (ret < 0)
 904                 {
 905                         sock->SetError(gnutls_strerror(ret));
 906                         CloseSession();
 907                         return -1;
 908                 }
 909         }
 910
 911         static const char* UnknownIfNULL(const char* str)
 912         {
 913                 return str ? str : "UNKNOWN";
 914         }
 915
 916         static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size)
 917         {
 918                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 919 #ifdef _WIN32
 920                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 921 #endif
 922
 923                 if (sock->GetEventMask() & FD_READ_WILL_BLOCK)
 924                 {
 925 #ifdef _WIN32
 926                         gnutls_transport_set_errno(session->sess, EAGAIN);
 927 #else
 928                         errno = EAGAIN;
 929 #endif
 930                         return -1;
 931                 }
 932
 933                 int rv = SocketEngine::Recv(sock, reinterpret_cast<char *>(buffer), size, 0);
 934
 935 #ifdef _WIN32
 936                 if (rv < 0)
 937                 {
 938                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
 939                          * and then set errno appropriately.
 940                          * The gnutls library may also have a different errno variable than us, see
 941                          * gnutls_transport_set_errno(3).
 942                          */
 943                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 944                 }
 945 #endif
 946
 947                 if (rv < (int)size)
 948                         SocketEngine::ChangeEventMask(sock, FD_READ_WILL_BLOCK);
 949                 return rv;
 950         }
 951
 952 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 953         static ssize_t VectorPush(gnutls_transport_ptr_t transportptr, const giovec_t* iov, int iovcnt)
 954         {
 955                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(transportptr);
 956 #ifdef _WIN32
 957                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 958 #endif
 959
 960                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 961                 {
 962 #ifdef _WIN32
 963                         gnutls_transport_set_errno(session->sess, EAGAIN);
 964 #else
 965                         errno = EAGAIN;
 966 #endif
 967                         return -1;
 968                 }
 969
 970                 // Cast the giovec_t to iovec not to IOVector so the correct function is called on Windows
 971                 int ret = SocketEngine::WriteV(sock, reinterpret_cast<const iovec*>(iov), iovcnt);
 972 #ifdef _WIN32
 973                 // See the function above for more info about the usage of gnutls_transport_set_errno() on Windows
 974                 if (ret < 0)
 975                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 976 #endif
 977
 978                 int size = 0;
 979                 for (int i = 0; i < iovcnt; i++)
 980                         size += iov[i].iov_len;
 981
 982                 if (ret < size)
 983                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
 984                 return ret;
 985         }
 986
 987 #else // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 988         static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size)
 989         {
 990                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 991 #ifdef _WIN32
 992                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetIOHook());
 993 #endif
 994
 995                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 996                 {
 997 #ifdef _WIN32
 998                         gnutls_transport_set_errno(session->sess, EAGAIN);
 999 #else
1000                         errno = EAGAIN;
1001 #endif
1002                         return -1;
1003                 }
1004
1005                 int rv = SocketEngine::Send(sock, reinterpret_cast<const char *>(buffer), size, 0);
1006
1007 #ifdef _WIN32
1008                 if (rv < 0)
1009                 {
1010                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
1011                          * and then set errno appropriately.
1012                          * The gnutls library may also have a different errno variable than us, see
1013                          * gnutls_transport_set_errno(3).
1014                          */
1015                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
1016                 }
1017 #endif
1018
1019                 if (rv < (int)size)
1020                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
1021                 return rv;
1022         }
1023 #endif // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1024
1025  public:
1026         GnuTLSIOHook(IOHookProvider* hookprov, StreamSocket* sock, inspircd_gnutls_session_init_flags_t flags, const reference<GnuTLS::Profile>& sslprofile)
1027                 : SSLIOHook(hookprov)
1028                 , sess(NULL)
1029                 , status(ISSL_NONE)
1030                 , profile(sslprofile)
1031 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1032                 , gbuffersize(0)
1033 #endif
1034         {
1035                 gnutls_init(&sess, flags);
1036                 gnutls_transport_set_ptr(sess, reinterpret_cast<gnutls_transport_ptr_t>(sock));
1037 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1038                 gnutls_transport_set_vec_push_function(sess, VectorPush);
1039 #else
1040                 gnutls_transport_set_push_function(sess, gnutls_push_wrapper);
1041 #endif
1042                 gnutls_transport_set_pull_function(sess, gnutls_pull_wrapper);
1043                 profile->SetupSession(sess);
1044
1045                 sock->AddIOHook(this);
1046                 Handshake(sock);
1047         }
1048
1049         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
1050         {
1051                 CloseSession();
1052         }
1053
1054         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
1055         {
1056                 // Finish handshake if needed
1057                 int prepret = PrepareIO(user);
1058                 if (prepret <= 0)
1059                         return prepret;
1060
1061                 // If we resumed the handshake then this->status will be ISSL_HANDSHAKEN.
1062                 {
1063                         GnuTLS::DataReader reader(sess);
1064                         int ret = reader.ret();
1065                         if (ret > 0)
1066                         {
1067                                 reader.appendto(recvq);
1068                                 return 1;
1069                         }
1070                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
1071                         {
1072                                 return 0;
1073                         }
1074                         else if (ret == 0)
1075                         {
1076                                 user->SetError("Connection closed");
1077                                 CloseSession();
1078                                 return -1;
1079                         }
1080                         else
1081                         {
1082                                 user->SetError(gnutls_strerror(ret));
1083                                 CloseSession();
1084                                 return -1;
1085                         }
1086                 }
1087         }
1088
1089         int OnStreamSocketWrite(StreamSocket* user) CXX11_OVERRIDE
1090         {
1091                 // Finish handshake if needed
1092                 int prepret = PrepareIO(user);
1093                 if (prepret <= 0)
1094                         return prepret;
1095
1096                 // Session is ready for transferring application data
1097                 StreamSocket::SendQueue& sendq = user->GetSendQ();
1098
1099 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1100                 while (true)
1101                 {
1102                         // If there is something in the GnuTLS buffer try to send() it
1103                         int ret = FlushBuffer(user);
1104                         if (ret <= 0)
1105                                 return ret; // Couldn't flush entire buffer, retry later (or close on error)
1106
1107                         // GnuTLS buffer is empty, if the sendq is empty as well then break to set FD_WANT_NO_WRITE
1108                         if (sendq.empty())
1109                                 break;
1110
1111                         // GnuTLS buffer is empty but sendq is not, begin sending data from the sendq
1112                         gnutls_record_cork(this->sess);
1113                         while ((!sendq.empty()) && (gbuffersize < profile->GetOutgoingRecordSize()))
1114                         {
1115                                 const StreamSocket::SendQueue::Element& elem = sendq.front();
1116                                 gbuffersize += elem.length();
1117                                 ret = gnutls_record_send(this->sess, elem.data(), elem.length());
1118                                 if (ret < 0)
1119                                 {
1120                                         CloseSession();
1121                                         return -1;
1122                                 }
1123                                 sendq.pop_front();
1124                         }
1125                 }
1126 #else
1127                 int ret = 0;
1128
1129                 while (!sendq.empty())
1130                 {
1131                         FlattenSendQueue(sendq, profile->GetOutgoingRecordSize());
1132                         const StreamSocket::SendQueue::Element& buffer = sendq.front();
1133                         ret = HandleWriteRet(user, gnutls_record_send(this->sess, buffer.data(), buffer.length()));
1134
1135                         if (ret <= 0)
1136                                 return ret;
1137                         else if (ret < (int)buffer.length())
1138                         {
1139                                 sendq.erase_front(ret);
1140                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
1141                                 return 0;
1142                         }
1143
1144                         // Wrote entire record, continue sending
1145                         sendq.pop_front();
1146                 }
1147 #endif
1148
1149                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_WRITE);
1150                 return 1;
1151         }
1152
1153         void TellCiphersAndFingerprint(LocalUser* user)
1154         {
1155                 if (sess)
1156                 {
1157                         std::string text = "*** You are connected using SSL cipher '";
1158                         GetCiphersuite(text);
1159                         text += '\'';
1160                         if (!certificate->fingerprint.empty())
1161                                 text += " and your SSL certificate fingerprint is " + certificate->fingerprint;
1162
1163                         user->WriteNotice(text);
1164                 }
1165         }
1166
1167         void GetCiphersuite(std::string& out) const
1168         {
1169                 out.append(UnknownIfNULL(gnutls_protocol_get_name(gnutls_protocol_get_version(sess)))).push_back('-');
1170                 out.append(UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess)))).push_back('-');
1171                 out.append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).push_back('-');
1172                 out.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess))));
1173         }
1174
1175         GnuTLS::Profile* GetProfile() { return profile; }
1176         bool IsHandshakeDone() const { return (status == ISSL_HANDSHAKEN); }
1177 };
1178
1179 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)
1180 {
1181 #ifndef GNUTLS_NEW_CERT_CALLBACK_API
1182         st->type = GNUTLS_CRT_X509;
1183 #else
1184         st->cert_type = GNUTLS_CRT_X509;
1185         st->key_type = GNUTLS_PRIVKEY_X509;
1186 #endif
1187         StreamSocket* sock = reinterpret_cast<StreamSocket*>(gnutls_transport_get_ptr(sess));
1188         GnuTLS::X509Credentials& cred = static_cast<GnuTLSIOHook*>(sock->GetIOHook())->GetProfile()->GetX509Credentials();
1189
1190         st->ncerts = cred.certs.size();
1191         st->cert.x509 = cred.certs.raw();
1192         st->key.x509 = cred.key.get();
1193         st->deinit_all = 0;
1194
1195         return 0;
1196 }
1197
1198 class GnuTLSIOHookProvider : public refcountbase, public IOHookProvider
1199 {
1200         reference<GnuTLS::Profile> profile;
1201
1202  public:
1203         GnuTLSIOHookProvider(Module* mod, reference<GnuTLS::Profile>& prof)
1204                 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
1205                 , profile(prof)
1206         {
1207                 ServerInstance->Modules->AddService(*this);
1208         }
1209
1210         ~GnuTLSIOHookProvider()
1211         {
1212                 ServerInstance->Modules->DelService(*this);
1213         }
1214
1215         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
1216         {
1217                 new GnuTLSIOHook(this, sock, GNUTLS_SERVER, profile);
1218         }
1219
1220         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
1221         {
1222                 new GnuTLSIOHook(this, sock, GNUTLS_CLIENT, profile);
1223         }
1224 };
1225
1226 class ModuleSSLGnuTLS : public Module
1227 {
1228         typedef std::vector<reference<GnuTLSIOHookProvider> > ProfileList;
1229
1230         // First member of the class, gets constructed first and destructed last
1231         GnuTLS::Init libinit;
1232         RandGen randhandler;
1233         ProfileList profiles;
1234
1235         void ReadProfiles()
1236         {
1237                 // First, store all profiles in a new, temporary container. If no problems occur, swap the two
1238                 // containers; this way if something goes wrong we can go back and continue using the current profiles,
1239                 // avoiding unpleasant situations where no new SSL connections are possible.
1240                 ProfileList newprofiles;
1241
1242                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
1243                 if (tags.first == tags.second)
1244                 {
1245                         // No <sslprofile> tags found, create a profile named "gnutls" from settings in the <gnutls> block
1246                         const std::string defname = "gnutls";
1247                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
1248                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found; using settings from the <gnutls> tag");
1249
1250                         try
1251                         {
1252                                 reference<GnuTLS::Profile> profile(GnuTLS::Profile::Create(defname, tag));
1253                                 newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1254                         }
1255                         catch (CoreException& ex)
1256                         {
1257                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
1258                         }
1259                 }
1260
1261                 for (ConfigIter i = tags.first; i != tags.second; ++i)
1262                 {
1263                         ConfigTag* tag = i->second;
1264                         if (tag->getString("provider") != "gnutls")
1265                                 continue;
1266
1267                         std::string name = tag->getString("name");
1268                         if (name.empty())
1269                         {
1270                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
1271                                 continue;
1272                         }
1273
1274                         reference<GnuTLS::Profile> profile;
1275                         try
1276                         {
1277                                 profile = GnuTLS::Profile::Create(name, tag);
1278                         }
1279                         catch (CoreException& ex)
1280                         {
1281                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
1282                         }
1283
1284                         newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1285                 }
1286
1287                 // New profiles are ok, begin using them
1288                 // Old profiles are deleted when their refcount drops to zero
1289                 profiles.swap(newprofiles);
1290         }
1291
1292  public:
1293         ModuleSSLGnuTLS()
1294         {
1295 #ifndef GNUTLS_HAS_RND
1296                 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
1297 #endif
1298         }
1299
1300         void init() CXX11_OVERRIDE
1301         {
1302                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "GnuTLS lib version %s module was compiled for " GNUTLS_VERSION, gnutls_check_version(NULL));
1303                 ReadProfiles();
1304                 ServerInstance->GenRandom = &randhandler;
1305         }
1306
1307         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
1308         {
1309                 if(param != "ssl")
1310                         return;
1311
1312                 try
1313                 {
1314                         ReadProfiles();
1315                 }
1316                 catch (ModuleException& ex)
1317                 {
1318                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
1319                 }
1320         }
1321
1322         ~ModuleSSLGnuTLS()
1323         {
1324                 ServerInstance->GenRandom = &ServerInstance->HandleGenRandom;
1325         }
1326
1327         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
1328         {
1329                 if(target_type == TYPE_USER)
1330                 {
1331                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
1332
1333                         if (user && user->eh.GetIOHook() && user->eh.GetIOHook()->prov->creator == this)
1334                         {
1335                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
1336                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
1337                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
1338                         }
1339                 }
1340         }
1341
1342         Version GetVersion() CXX11_OVERRIDE
1343         {
1344                 return Version("Provides SSL support for clients", VF_VENDOR);
1345         }
1346
1347         void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
1348         {
1349                 IOHook* hook = user->eh.GetIOHook();
1350                 if (hook && hook->prov->creator == this)
1351                         static_cast<GnuTLSIOHook*>(hook)->TellCiphersAndFingerprint(user);
1352         }
1353
1354         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
1355         {
1356                 if ((user->eh.GetIOHook()) && (user->eh.GetIOHook()->prov->creator == this))
1357                 {
1358                         GnuTLSIOHook* iohook = static_cast<GnuTLSIOHook*>(user->eh.GetIOHook());
1359                         if (!iohook->IsHandshakeDone())
1360                                 return MOD_RES_DENY;
1361                 }
1362
1363                 return MOD_RES_PASSTHRU;
1364         }
1365 };
1366
1367 MODULE_INIT(ModuleSSLGnuTLS)