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 /// $CompilerFlags: find_compiler_flags("gnutls")
  24 /// $CompilerFlags: require_version("gnutls" "1.0" "2.12") execute("libgcrypt-config --cflags" "LIBGCRYPT_CXXFLAGS")
  25
  26 /// $LinkerFlags: find_linker_flags("gnutls" "-lgnutls")
  27 /// $LinkerFlags: require_version("gnutls" "1.0" "2.12") execute("libgcrypt-config --libs" "LIBGCRYPT_LDFLAGS")
  28
  29 /// $PackageInfo: require_system("centos") gnutls-devel pkgconfig
  30 /// $PackageInfo: require_system("darwin") gnutls pkg-config
  31 /// $PackageInfo: require_system("debian" "1.0" "7.99") libgcrypt11-dev
  32 /// $PackageInfo: require_system("debian") gnutls-bin libgnutls28-dev pkg-config
  33 /// $PackageInfo: require_system("ubuntu" "1.0" "13.10") libgcrypt11-dev
  34 /// $PackageInfo: require_system("ubuntu") gnutls-bin libgnutls-dev pkg-config
  35
  36 #include "inspircd.h"
  37 #include "modules/ssl.h"
  38 #include <memory>
  39
  40 // Fix warnings about the use of commas at end of enumerator lists on C++03.
  41 #if defined __clang__
  42 # pragma clang diagnostic ignored "-Wc++11-extensions"
  43 #elif defined __GNUC__
  44 # if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8))
  45 #  pragma GCC diagnostic ignored "-Wpedantic"
  46 # else
  47 #  pragma GCC diagnostic ignored "-pedantic"
  48 # endif
  49 #endif
  50
  51 // Fix warnings about using std::auto_ptr on C++11 or newer.
  52 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  53
  54 #include <gnutls/gnutls.h>
  55 #include <gnutls/x509.h>
  56
  57 #ifndef GNUTLS_VERSION_NUMBER
  58 #define GNUTLS_VERSION_NUMBER LIBGNUTLS_VERSION_NUMBER
  59 #define GNUTLS_VERSION LIBGNUTLS_VERSION
  60 #endif
  61
  62 // Check if the GnuTLS library is at least version major.minor.patch
  63 #define INSPIRCD_GNUTLS_HAS_VERSION(major, minor, patch) (GNUTLS_VERSION_NUMBER >= ((major << 16) | (minor << 8) | patch))
  64
  65 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 9, 8)
  66 #define GNUTLS_HAS_MAC_GET_ID
  67 #include <gnutls/crypto.h>
  68 #endif
  69
  70 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 12, 0)
  71 # define GNUTLS_HAS_RND
  72 #else
  73 # include <gcrypt.h>
  74 #endif
  75
  76 #ifdef _WIN32
  77 # pragma comment(lib, "libgnutls-30.lib")
  78 #endif
  79
  80 // These don't exist in older GnuTLS versions
  81 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 1, 7)
  82 #define GNUTLS_NEW_PRIO_API
  83 #endif
  84
  85 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_HANDSHAKEN };
  86
  87 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 12, 0)
  88 #define INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
  89 #define GNUTLS_NEW_CERT_CALLBACK_API
  90 typedef gnutls_retr2_st cert_cb_last_param_type;
  91 #else
  92 typedef gnutls_retr_st cert_cb_last_param_type;
  93 #endif
  94
  95 #if INSPIRCD_GNUTLS_HAS_VERSION(3, 3, 5)
  96 #define INSPIRCD_GNUTLS_HAS_RECV_PACKET
  97 #endif
  98
  99 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 99, 0)
 100 // The second parameter of gnutls_init() has changed in 2.99.0 from gnutls_connection_end_t to unsigned int
 101 // (it became a general flags parameter) and the enum has been deprecated and generates a warning on use.
 102 typedef unsigned int inspircd_gnutls_session_init_flags_t;
 103 #else
 104 typedef gnutls_connection_end_t inspircd_gnutls_session_init_flags_t;
 105 #endif
 106
 107 #if INSPIRCD_GNUTLS_HAS_VERSION(3, 1, 9)
 108 #define INSPIRCD_GNUTLS_HAS_CORK
 109 #endif
 110
 111 static Module* thismod;
 112
 113 class RandGen
 114 {
 115  public:
 116         static void Call(char* buffer, size_t len)
 117         {
 118 #ifdef GNUTLS_HAS_RND
 119                 gnutls_rnd(GNUTLS_RND_RANDOM, buffer, len);
 120 #else
 121                 gcry_randomize(buffer, len, GCRY_STRONG_RANDOM);
 122 #endif
 123         }
 124 };
 125
 126 namespace GnuTLS
 127 {
 128         class Init
 129         {
 130          public:
 131                 Init() { gnutls_global_init(); }
 132                 ~Init() { gnutls_global_deinit(); }
 133         };
 134
 135         class Exception : public ModuleException
 136         {
 137          public:
 138                 Exception(const std::string& reason)
 139                         : ModuleException(reason) { }
 140         };
 141
 142         void ThrowOnError(int errcode, const char* msg)
 143         {
 144                 if (errcode < 0)
 145                 {
 146                         std::string reason = msg;
 147                         reason.append(" :").append(gnutls_strerror(errcode));
 148                         throw Exception(reason);
 149                 }
 150         }
 151
 152         /** Used to create a gnutls_datum_t* from a std::string
 153          */
 154         class Datum
 155         {
 156                 gnutls_datum_t datum;
 157
 158          public:
 159                 Datum(const std::string& dat)
 160                 {
 161                         datum.data = (unsigned char*)dat.data();
 162                         datum.size = static_cast<unsigned int>(dat.length());
 163                 }
 164
 165                 const gnutls_datum_t* get() const { return &datum; }
 166         };
 167
 168         class Hash
 169         {
 170                 gnutls_digest_algorithm_t hash;
 171
 172          public:
 173                 // Nothing to deallocate, constructor may throw freely
 174                 Hash(const std::string& hashname)
 175                 {
 176                         // As older versions of gnutls can't do this, let's disable it where needed.
 177 #ifdef GNUTLS_HAS_MAC_GET_ID
 178                         // As gnutls_digest_algorithm_t and gnutls_mac_algorithm_t are mapped 1:1, we can do this
 179                         // There is no gnutls_dig_get_id() at the moment, but it may come later
 180                         hash = (gnutls_digest_algorithm_t)gnutls_mac_get_id(hashname.c_str());
 181                         if (hash == GNUTLS_DIG_UNKNOWN)
 182                                 throw Exception("Unknown hash type " + hashname);
 183
 184                         // Check if the user is giving us something that is a valid MAC but not digest
 185                         gnutls_hash_hd_t is_digest;
 186                         if (gnutls_hash_init(&is_digest, hash) < 0)
 187                                 throw Exception("Unknown hash type " + hashname);
 188                         gnutls_hash_deinit(is_digest, NULL);
 189 #else
 190                         if (stdalgo::string::equalsci(hashname, "md5"))
 191                                 hash = GNUTLS_DIG_MD5;
 192                         else if (stdalgo::string::equalsci(hashname, "sha1"))
 193                                 hash = GNUTLS_DIG_SHA1;
 194 #ifdef INSPIRCD_GNUTLS_ENABLE_SHA256_FINGERPRINT
 195                         else if (stdalgo::string::equalsci(hashname, "sha256"))
 196                                 hash = GNUTLS_DIG_SHA256;
 197 #endif
 198                         else
 199                                 throw Exception("Unknown hash type " + hashname);
 200 #endif
 201                 }
 202
 203                 gnutls_digest_algorithm_t get() const { return hash; }
 204         };
 205
 206         class DHParams
 207         {
 208                 gnutls_dh_params_t dh_params;
 209
 210                 DHParams()
 211                 {
 212                         ThrowOnError(gnutls_dh_params_init(&dh_params), "gnutls_dh_params_init() failed");
 213                 }
 214
 215          public:
 216                 /** Import */
 217                 static std::auto_ptr<DHParams> Import(const std::string& dhstr)
 218                 {
 219                         std::auto_ptr<DHParams> dh(new DHParams);
 220                         int ret = gnutls_dh_params_import_pkcs3(dh->dh_params, Datum(dhstr).get(), GNUTLS_X509_FMT_PEM);
 221                         ThrowOnError(ret, "Unable to import DH params");
 222                         return dh;
 223                 }
 224
 225                 ~DHParams()
 226                 {
 227                         gnutls_dh_params_deinit(dh_params);
 228                 }
 229
 230                 const gnutls_dh_params_t& get() const { return dh_params; }
 231         };
 232
 233         class X509Key
 234         {
 235                 /** Ensure that the key is deinited in case the constructor of X509Key throws
 236                  */
 237                 class RAIIKey
 238                 {
 239                  public:
 240                         gnutls_x509_privkey_t key;
 241
 242                         RAIIKey()
 243                         {
 244                                 ThrowOnError(gnutls_x509_privkey_init(&key), "gnutls_x509_privkey_init() failed");
 245                         }
 246
 247                         ~RAIIKey()
 248                         {
 249                                 gnutls_x509_privkey_deinit(key);
 250                         }
 251                 } key;
 252
 253          public:
 254                 /** Import */
 255                 X509Key(const std::string& keystr)
 256                 {
 257                         int ret = gnutls_x509_privkey_import(key.key, Datum(keystr).get(), GNUTLS_X509_FMT_PEM);
 258                         ThrowOnError(ret, "Unable to import private key");
 259                 }
 260
 261                 gnutls_x509_privkey_t& get() { return key.key; }
 262         };
 263
 264         class X509CertList
 265         {
 266                 std::vector<gnutls_x509_crt_t> certs;
 267
 268          public:
 269                 /** Import */
 270                 X509CertList(const std::string& certstr)
 271                 {
 272                         unsigned int certcount = 3;
 273                         certs.resize(certcount);
 274                         Datum datum(certstr);
 275
 276                         int ret = gnutls_x509_crt_list_import(raw(), &certcount, datum.get(), GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 277                         if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
 278                         {
 279                                 // the buffer wasn't big enough to hold all certs but gnutls changed certcount to the number of available certs,
 280                                 // try again with a bigger buffer
 281                                 certs.resize(certcount);
 282                                 ret = gnutls_x509_crt_list_import(raw(), &certcount, datum.get(), GNUTLS_X509_FMT_PEM, GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
 283                         }
 284
 285                         ThrowOnError(ret, "Unable to load certificates");
 286
 287                         // Resize the vector to the actual number of certs because we rely on its size being correct
 288                         // when deallocating the certs
 289                         certs.resize(certcount);
 290                 }
 291
 292                 ~X509CertList()
 293                 {
 294                         for (std::vector<gnutls_x509_crt_t>::iterator i = certs.begin(); i != certs.end(); ++i)
 295                                 gnutls_x509_crt_deinit(*i);
 296                 }
 297
 298                 gnutls_x509_crt_t* raw() { return &certs[0]; }
 299                 unsigned int size() const { return certs.size(); }
 300         };
 301
 302         class X509CRL : public refcountbase
 303         {
 304                 class RAIICRL
 305                 {
 306                  public:
 307                         gnutls_x509_crl_t crl;
 308
 309                         RAIICRL()
 310                         {
 311                                 ThrowOnError(gnutls_x509_crl_init(&crl), "gnutls_x509_crl_init() failed");
 312                         }
 313
 314                         ~RAIICRL()
 315                         {
 316                                 gnutls_x509_crl_deinit(crl);
 317                         }
 318                 } crl;
 319
 320          public:
 321                 /** Import */
 322                 X509CRL(const std::string& crlstr)
 323                 {
 324                         int ret = gnutls_x509_crl_import(get(), Datum(crlstr).get(), GNUTLS_X509_FMT_PEM);
 325                         ThrowOnError(ret, "Unable to load certificate revocation list");
 326                 }
 327
 328                 gnutls_x509_crl_t& get() { return crl.crl; }
 329         };
 330
 331 #ifdef GNUTLS_NEW_PRIO_API
 332         class Priority
 333         {
 334                 gnutls_priority_t priority;
 335
 336          public:
 337                 Priority(const std::string& priorities)
 338                 {
 339                         // Try to set the priorities for ciphers, kex methods etc. to the user supplied string
 340                         // If the user did not supply anything then the string is already set to "NORMAL"
 341                         const char* priocstr = priorities.c_str();
 342                         const char* prioerror;
 343
 344                         int ret = gnutls_priority_init(&priority, priocstr, &prioerror);
 345                         if (ret < 0)
 346                         {
 347                                 // gnutls did not understand the user supplied string
 348                                 throw Exception("Unable to initialize priorities to \"" + priorities + "\": " + gnutls_strerror(ret) + " Syntax error at position " + ConvToStr((unsigned int) (prioerror - priocstr)));
 349                         }
 350                 }
 351
 352                 ~Priority()
 353                 {
 354                         gnutls_priority_deinit(priority);
 355                 }
 356
 357                 void SetupSession(gnutls_session_t sess)
 358                 {
 359                         gnutls_priority_set(sess, priority);
 360                 }
 361
 362                 static const char* GetDefault()
 363                 {
 364                         return "NORMAL:%SERVER_PRECEDENCE:-VERS-SSL3.0";
 365                 }
 366
 367                 static std::string RemoveUnknownTokens(const std::string& prio)
 368                 {
 369                         std::string ret;
 370                         irc::sepstream ss(prio, ':');
 371                         for (std::string token; ss.GetToken(token); )
 372                         {
 373                                 // Save current position so we can revert later if needed
 374                                 const std::string::size_type prevpos = ret.length();
 375                                 // Append next token
 376                                 if (!ret.empty())
 377                                         ret.push_back(':');
 378                                 ret.append(token);
 379
 380                                 gnutls_priority_t test;
 381                                 if (gnutls_priority_init(&test, ret.c_str(), NULL) < 0)
 382                                 {
 383                                         // The new token broke the priority string, revert to the previously working one
 384                                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Priority string token not recognized: \"%s\"", token.c_str());
 385                                         ret.erase(prevpos);
 386                                 }
 387                                 else
 388                                 {
 389                                         // Worked
 390                                         gnutls_priority_deinit(test);
 391                                 }
 392                         }
 393                         return ret;
 394                 }
 395         };
 396 #else
 397         /** Dummy class, used when gnutls_priority_set() is not available
 398          */
 399         class Priority
 400         {
 401          public:
 402                 Priority(const std::string& priorities)
 403                 {
 404                         if (priorities != GetDefault())
 405                                 throw Exception("You've set a non-default priority string, but GnuTLS lacks support for it");
 406                 }
 407
 408                 static void SetupSession(gnutls_session_t sess)
 409                 {
 410                         // Always set the default priorities
 411                         gnutls_set_default_priority(sess);
 412                 }
 413
 414                 static const char* GetDefault()
 415                 {
 416                         return "NORMAL";
 417                 }
 418
 419                 static std::string RemoveUnknownTokens(const std::string& prio)
 420                 {
 421                         // We don't do anything here because only NORMAL is accepted
 422                         return prio;
 423                 }
 424         };
 425 #endif
 426
 427         class CertCredentials
 428         {
 429                 /** DH parameters associated with these credentials
 430                  */
 431                 std::auto_ptr<DHParams> dh;
 432
 433          protected:
 434                 gnutls_certificate_credentials_t cred;
 435
 436          public:
 437                 CertCredentials()
 438                 {
 439                         ThrowOnError(gnutls_certificate_allocate_credentials(&cred), "Cannot allocate certificate credentials");
 440                 }
 441
 442                 ~CertCredentials()
 443                 {
 444                         gnutls_certificate_free_credentials(cred);
 445                 }
 446
 447                 /** Associates these credentials with the session
 448                  */
 449                 void SetupSession(gnutls_session_t sess)
 450                 {
 451                         gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, cred);
 452                 }
 453
 454                 /** Set the given DH parameters to be used with these credentials
 455                  */
 456                 void SetDH(std::auto_ptr<DHParams>& DH)
 457                 {
 458                         dh = DH;
 459                         gnutls_certificate_set_dh_params(cred, dh->get());
 460                 }
 461         };
 462
 463         class X509Credentials : public CertCredentials
 464         {
 465                 /** Private key
 466                  */
 467                 X509Key key;
 468
 469                 /** Certificate list, presented to the peer
 470                  */
 471                 X509CertList certs;
 472
 473                 /** Trusted CA, may be NULL
 474                  */
 475                 std::auto_ptr<X509CertList> trustedca;
 476
 477                 /** Certificate revocation list, may be NULL
 478                  */
 479                 std::auto_ptr<X509CRL> crl;
 480
 481                 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);
 482
 483          public:
 484                 X509Credentials(const std::string& certstr, const std::string& keystr)
 485                         : key(keystr)
 486                         , certs(certstr)
 487                 {
 488                         // Throwing is ok here, the destructor of Credentials is called in that case
 489                         int ret = gnutls_certificate_set_x509_key(cred, certs.raw(), certs.size(), key.get());
 490                         ThrowOnError(ret, "Unable to set cert/key pair");
 491
 492 #ifdef GNUTLS_NEW_CERT_CALLBACK_API
 493                         gnutls_certificate_set_retrieve_function(cred, cert_callback);
 494 #else
 495                         gnutls_certificate_client_set_retrieve_function(cred, cert_callback);
 496 #endif
 497                 }
 498
 499                 /** Sets the trusted CA and the certificate revocation list
 500                  * to use when verifying certificates
 501                  */
 502                 void SetCA(std::auto_ptr<X509CertList>& certlist, std::auto_ptr<X509CRL>& CRL)
 503                 {
 504                         // Do nothing if certlist is NULL
 505                         if (certlist.get())
 506                         {
 507                                 int ret = gnutls_certificate_set_x509_trust(cred, certlist->raw(), certlist->size());
 508                                 ThrowOnError(ret, "gnutls_certificate_set_x509_trust() failed");
 509
 510                                 if (CRL.get())
 511                                 {
 512                                         ret = gnutls_certificate_set_x509_crl(cred, &CRL->get(), 1);
 513                                         ThrowOnError(ret, "gnutls_certificate_set_x509_crl() failed");
 514                                 }
 515
 516                                 trustedca = certlist;
 517                                 crl = CRL;
 518                         }
 519                 }
 520         };
 521
 522         class DataReader
 523         {
 524                 int retval;
 525 #ifdef INSPIRCD_GNUTLS_HAS_RECV_PACKET
 526                 gnutls_packet_t packet;
 527
 528          public:
 529                 DataReader(gnutls_session_t sess)
 530                 {
 531                         // Using the packet API avoids the final copy of the data which GnuTLS does if we supply
 532                         // our own buffer. Instead, we get the buffer containing the data from GnuTLS and copy it
 533                         // to the recvq directly from there in appendto().
 534                         retval = gnutls_record_recv_packet(sess, &packet);
 535                 }
 536
 537                 void appendto(std::string& recvq)
 538                 {
 539                         // Copy data from GnuTLS buffers to recvq
 540                         gnutls_datum_t datum;
 541                         gnutls_packet_get(packet, &datum, NULL);
 542                         recvq.append(reinterpret_cast<const char*>(datum.data), datum.size);
 543
 544                         gnutls_packet_deinit(packet);
 545                 }
 546 #else
 547                 char* const buffer;
 548
 549          public:
 550                 DataReader(gnutls_session_t sess)
 551                         : buffer(ServerInstance->GetReadBuffer())
 552                 {
 553                         // Read data from GnuTLS buffers into ReadBuffer
 554                         retval = gnutls_record_recv(sess, buffer, ServerInstance->Config->NetBufferSize);
 555                 }
 556
 557                 void appendto(std::string& recvq)
 558                 {
 559                         // Copy data from ReadBuffer to recvq
 560                         recvq.append(buffer, retval);
 561                 }
 562 #endif
 563
 564                 int ret() const { return retval; }
 565         };
 566
 567         class Profile
 568         {
 569                 /** Name of this profile
 570                  */
 571                 const std::string name;
 572
 573                 /** X509 certificate(s) and key
 574                  */
 575                 X509Credentials x509cred;
 576
 577                 /** The minimum length in bits for the DH prime to be accepted as a client
 578                  */
 579                 unsigned int min_dh_bits;
 580
 581                 /** Hashing algorithm to use when generating certificate fingerprints
 582                  */
 583                 Hash hash;
 584
 585                 /** Priorities for ciphers, compression methods, etc.
 586                  */
 587                 Priority priority;
 588
 589                 /** Rough max size of records to send
 590                  */
 591                 const unsigned int outrecsize;
 592
 593                 /** True to request a client certificate as a server
 594                  */
 595                 const bool requestclientcert;
 596
 597                 static std::string ReadFile(const std::string& filename)
 598                 {
 599                         FileReader reader(filename);
 600                         std::string ret = reader.GetString();
 601                         if (ret.empty())
 602                                 throw Exception("Cannot read file " + filename);
 603                         return ret;
 604                 }
 605
 606                 static std::string GetPrioStr(const std::string& profilename, ConfigTag* tag)
 607                 {
 608                         // Use default priority string if this tag does not specify one
 609                         std::string priostr = GnuTLS::Priority::GetDefault();
 610                         bool found = tag->readString("priority", priostr);
 611                         // 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
 612                         if (!tag->getBool("strictpriority", found))
 613                         {
 614                                 std::string stripped = GnuTLS::Priority::RemoveUnknownTokens(priostr);
 615                                 if (stripped.empty())
 616                                 {
 617                                         // Stripping failed, act as if a prio string wasn't set
 618                                         stripped = GnuTLS::Priority::RemoveUnknownTokens(GnuTLS::Priority::GetDefault());
 619                                         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());
 620                                 }
 621                                 else if ((found) && (stripped != priostr))
 622                                 {
 623                                         // Prio string was set in the config and we ended up with something that works but different
 624                                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Priority string for profile \"%s\" contains unknown tokens, stripped to \"%s\"", profilename.c_str(), stripped.c_str());
 625                                 }
 626                                 priostr.swap(stripped);
 627                         }
 628                         return priostr;
 629                 }
 630
 631          public:
 632                 struct Config
 633                 {
 634                         std::string name;
 635
 636                         std::auto_ptr<X509CertList> ca;
 637                         std::auto_ptr<X509CRL> crl;
 638
 639                         std::string certstr;
 640                         std::string keystr;
 641                         std::auto_ptr<DHParams> dh;
 642
 643                         std::string priostr;
 644                         unsigned int mindh;
 645                         std::string hashstr;
 646
 647                         unsigned int outrecsize;
 648                         bool requestclientcert;
 649
 650                         Config(const std::string& profilename, ConfigTag* tag)
 651                                 : name(profilename)
 652                                 , certstr(ReadFile(tag->getString("certfile", "cert.pem")))
 653                                 , keystr(ReadFile(tag->getString("keyfile", "key.pem")))
 654                                 , dh(DHParams::Import(ReadFile(tag->getString("dhfile", "dhparams.pem"))))
 655                                 , priostr(GetPrioStr(profilename, tag))
 656                                 , mindh(tag->getUInt("mindhbits", 1024))
 657                                 , hashstr(tag->getString("hash", "md5"))
 658                                 , requestclientcert(tag->getBool("requestclientcert", true))
 659                         {
 660                                 // Load trusted CA and revocation list, if set
 661                                 std::string filename = tag->getString("cafile");
 662                                 if (!filename.empty())
 663                                 {
 664                                         ca.reset(new X509CertList(ReadFile(filename)));
 665
 666                                         filename = tag->getString("crlfile");
 667                                         if (!filename.empty())
 668                                                 crl.reset(new X509CRL(ReadFile(filename)));
 669                                 }
 670
 671 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 672                                 // If cork support is available outrecsize represents the (rough) max amount of data we give GnuTLS while corked
 673                                 outrecsize = tag->getUInt("outrecsize", 2048, 512);
 674 #else
 675                                 outrecsize = tag->getUInt("outrecsize", 2048, 512, 16384);
 676 #endif
 677                         }
 678                 };
 679
 680                 Profile(Config& config)
 681                         : name(config.name)
 682                         , x509cred(config.certstr, config.keystr)
 683                         , min_dh_bits(config.mindh)
 684                         , hash(config.hashstr)
 685                         , priority(config.priostr)
 686                         , outrecsize(config.outrecsize)
 687                         , requestclientcert(config.requestclientcert)
 688                 {
 689                         x509cred.SetDH(config.dh);
 690                         x509cred.SetCA(config.ca, config.crl);
 691                 }
 692                 /** Set up the given session with the settings in this profile
 693                  */
 694                 void SetupSession(gnutls_session_t sess)
 695                 {
 696                         priority.SetupSession(sess);
 697                         x509cred.SetupSession(sess);
 698                         gnutls_dh_set_prime_bits(sess, min_dh_bits);
 699
 700                         // Request client certificate if enabled and we are a server, no-op if we're a client
 701                         if (requestclientcert)
 702                                 gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
 703                 }
 704
 705                 const std::string& GetName() const { return name; }
 706                 X509Credentials& GetX509Credentials() { return x509cred; }
 707                 gnutls_digest_algorithm_t GetHash() const { return hash.get(); }
 708                 unsigned int GetOutgoingRecordSize() const { return outrecsize; }
 709         };
 710 }
 711
 712 class GnuTLSIOHook : public SSLIOHook
 713 {
 714  private:
 715         gnutls_session_t sess;
 716         issl_status status;
 717 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 718         size_t gbuffersize;
 719 #endif
 720
 721         void CloseSession()
 722         {
 723                 if (this->sess)
 724                 {
 725                         gnutls_bye(this->sess, GNUTLS_SHUT_WR);
 726                         gnutls_deinit(this->sess);
 727                 }
 728                 sess = NULL;
 729                 certificate = NULL;
 730                 status = ISSL_NONE;
 731         }
 732
 733         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 734         int Handshake(StreamSocket* user)
 735         {
 736                 int ret = gnutls_handshake(this->sess);
 737
 738                 if (ret < 0)
 739                 {
 740                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 741                         {
 742                                 // Handshake needs resuming later, read() or write() would have blocked.
 743                                 this->status = ISSL_HANDSHAKING;
 744
 745                                 if (gnutls_record_get_direction(this->sess) == 0)
 746                                 {
 747                                         // gnutls_handshake() wants to read() again.
 748                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 749                                 }
 750                                 else
 751                                 {
 752                                         // gnutls_handshake() wants to write() again.
 753                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 754                                 }
 755
 756                                 return 0;
 757                         }
 758                         else
 759                         {
 760                                 user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret)));
 761                                 CloseSession();
 762                                 return -1;
 763                         }
 764                 }
 765                 else
 766                 {
 767                         // Change the seesion state
 768                         this->status = ISSL_HANDSHAKEN;
 769
 770                         VerifyCertificate();
 771
 772                         // Finish writing, if any left
 773                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 774
 775                         return 1;
 776                 }
 777         }
 778
 779         void VerifyCertificate()
 780         {
 781                 unsigned int certstatus;
 782                 const gnutls_datum_t* cert_list;
 783                 int ret;
 784                 unsigned int cert_list_size;
 785                 gnutls_x509_crt_t cert;
 786                 char str[512];
 787                 unsigned char digest[512];
 788                 size_t digest_size = sizeof(digest);
 789                 size_t name_size = sizeof(str);
 790                 ssl_cert* certinfo = new ssl_cert;
 791                 this->certificate = certinfo;
 792
 793                 /* This verification function uses the trusted CAs in the credentials
 794                  * structure. So you must have installed one or more CA certificates.
 795                  */
 796                 ret = gnutls_certificate_verify_peers2(this->sess, &certstatus);
 797
 798                 if (ret < 0)
 799                 {
 800                         certinfo->error = std::string(gnutls_strerror(ret));
 801                         return;
 802                 }
 803
 804                 certinfo->invalid = (certstatus & GNUTLS_CERT_INVALID);
 805                 certinfo->unknownsigner = (certstatus & GNUTLS_CERT_SIGNER_NOT_FOUND);
 806                 certinfo->revoked = (certstatus & GNUTLS_CERT_REVOKED);
 807                 certinfo->trusted = !(certstatus & GNUTLS_CERT_SIGNER_NOT_CA);
 808
 809                 /* Up to here the process is the same for X.509 certificates and
 810                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 811                  * be easily extended to work with openpgp keys as well.
 812                  */
 813                 if (gnutls_certificate_type_get(this->sess) != GNUTLS_CRT_X509)
 814                 {
 815                         certinfo->error = "No X509 keys sent";
 816                         return;
 817                 }
 818
 819                 ret = gnutls_x509_crt_init(&cert);
 820                 if (ret < 0)
 821                 {
 822                         certinfo->error = gnutls_strerror(ret);
 823                         return;
 824                 }
 825
 826                 cert_list_size = 0;
 827                 cert_list = gnutls_certificate_get_peers(this->sess, &cert_list_size);
 828                 if (cert_list == NULL)
 829                 {
 830                         certinfo->error = "No certificate was found";
 831                         goto info_done_dealloc;
 832                 }
 833
 834                 /* This is not a real world example, since we only check the first
 835                  * certificate in the given chain.
 836                  */
 837
 838                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 839                 if (ret < 0)
 840                 {
 841                         certinfo->error = gnutls_strerror(ret);
 842                         goto info_done_dealloc;
 843                 }
 844
 845                 if (gnutls_x509_crt_get_dn(cert, str, &name_size) == 0)
 846                 {
 847                         std::string& dn = certinfo->dn;
 848                         dn = str;
 849                         // Make sure there are no chars in the string that we consider invalid
 850                         if (dn.find_first_of("\r\n") != std::string::npos)
 851                                 dn.clear();
 852                 }
 853
 854                 name_size = sizeof(str);
 855                 if (gnutls_x509_crt_get_issuer_dn(cert, str, &name_size) == 0)
 856                 {
 857                         std::string& issuer = certinfo->issuer;
 858                         issuer = str;
 859                         if (issuer.find_first_of("\r\n") != std::string::npos)
 860                                 issuer.clear();
 861                 }
 862
 863                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, GetProfile().GetHash(), digest, &digest_size)) < 0)
 864                 {
 865                         certinfo->error = gnutls_strerror(ret);
 866                 }
 867                 else
 868                 {
 869                         certinfo->fingerprint = BinToHex(digest, digest_size);
 870                 }
 871
 872                 /* Beware here we do not check for errors.
 873                  */
 874                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 875                 {
 876                         certinfo->error = "Not activated, or expired certificate";
 877                 }
 878
 879 info_done_dealloc:
 880                 gnutls_x509_crt_deinit(cert);
 881         }
 882
 883         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 884         int PrepareIO(StreamSocket* sock)
 885         {
 886                 if (status == ISSL_HANDSHAKEN)
 887                         return 1;
 888                 else if (status == ISSL_HANDSHAKING)
 889                 {
 890                         // The handshake isn't finished, try to finish it
 891                         return Handshake(sock);
 892                 }
 893
 894                 CloseSession();
 895                 sock->SetError("No SSL session");
 896                 return -1;
 897         }
 898
 899 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 900         int FlushBuffer(StreamSocket* sock)
 901         {
 902                 // If GnuTLS has some data buffered, write it
 903                 if (gbuffersize)
 904                         return HandleWriteRet(sock, gnutls_record_uncork(this->sess, 0));
 905                 return 1;
 906         }
 907 #endif
 908
 909         int HandleWriteRet(StreamSocket* sock, int ret)
 910         {
 911                 if (ret > 0)
 912                 {
 913 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 914                         gbuffersize -= ret;
 915                         if (gbuffersize)
 916                         {
 917                                 SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 918                                 return 0;
 919                         }
 920 #endif
 921                         return ret;
 922                 }
 923                 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
 924                 {
 925                         SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 926                         return 0;
 927                 }
 928                 else // (ret < 0)
 929                 {
 930                         sock->SetError(gnutls_strerror(ret));
 931                         CloseSession();
 932                         return -1;
 933                 }
 934         }
 935
 936         static const char* UnknownIfNULL(const char* str)
 937         {
 938                 return str ? str : "UNKNOWN";
 939         }
 940
 941         static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size)
 942         {
 943                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 944 #ifdef _WIN32
 945                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 946 #endif
 947
 948                 if (sock->GetEventMask() & FD_READ_WILL_BLOCK)
 949                 {
 950 #ifdef _WIN32
 951                         gnutls_transport_set_errno(session->sess, EAGAIN);
 952 #else
 953                         errno = EAGAIN;
 954 #endif
 955                         return -1;
 956                 }
 957
 958                 int rv = SocketEngine::Recv(sock, reinterpret_cast<char *>(buffer), size, 0);
 959
 960 #ifdef _WIN32
 961                 if (rv < 0)
 962                 {
 963                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
 964                          * and then set errno appropriately.
 965                          * The gnutls library may also have a different errno variable than us, see
 966                          * gnutls_transport_set_errno(3).
 967                          */
 968                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 969                 }
 970 #endif
 971
 972                 if (rv < (int)size)
 973                         SocketEngine::ChangeEventMask(sock, FD_READ_WILL_BLOCK);
 974                 return rv;
 975         }
 976
 977 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 978         static ssize_t VectorPush(gnutls_transport_ptr_t transportptr, const giovec_t* iov, int iovcnt)
 979         {
 980                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(transportptr);
 981 #ifdef _WIN32
 982                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 983 #endif
 984
 985                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 986                 {
 987 #ifdef _WIN32
 988                         gnutls_transport_set_errno(session->sess, EAGAIN);
 989 #else
 990                         errno = EAGAIN;
 991 #endif
 992                         return -1;
 993                 }
 994
 995                 // Cast the giovec_t to iovec not to IOVector so the correct function is called on Windows
 996                 int ret = SocketEngine::WriteV(sock, reinterpret_cast<const iovec*>(iov), iovcnt);
 997 #ifdef _WIN32
 998                 // See the function above for more info about the usage of gnutls_transport_set_errno() on Windows
 999                 if (ret < 0)
1000                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
1001 #endif
1002
1003                 int size = 0;
1004                 for (int i = 0; i < iovcnt; i++)
1005                         size += iov[i].iov_len;
1006
1007                 if (ret < size)
1008                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
1009                 return ret;
1010         }
1011
1012 #else // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1013         static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size)
1014         {
1015                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
1016 #ifdef _WIN32
1017                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
1018 #endif
1019
1020                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
1021                 {
1022 #ifdef _WIN32
1023                         gnutls_transport_set_errno(session->sess, EAGAIN);
1024 #else
1025                         errno = EAGAIN;
1026 #endif
1027                         return -1;
1028                 }
1029
1030                 int rv = SocketEngine::Send(sock, reinterpret_cast<const char *>(buffer), size, 0);
1031
1032 #ifdef _WIN32
1033                 if (rv < 0)
1034                 {
1035                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
1036                          * and then set errno appropriately.
1037                          * The gnutls library may also have a different errno variable than us, see
1038                          * gnutls_transport_set_errno(3).
1039                          */
1040                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
1041                 }
1042 #endif
1043
1044                 if (rv < (int)size)
1045                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
1046                 return rv;
1047         }
1048 #endif // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1049
1050  public:
1051         GnuTLSIOHook(IOHookProvider* hookprov, StreamSocket* sock, inspircd_gnutls_session_init_flags_t flags)
1052                 : SSLIOHook(hookprov)
1053                 , sess(NULL)
1054                 , status(ISSL_NONE)
1055 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1056                 , gbuffersize(0)
1057 #endif
1058         {
1059                 gnutls_init(&sess, flags);
1060                 gnutls_transport_set_ptr(sess, reinterpret_cast<gnutls_transport_ptr_t>(sock));
1061 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1062                 gnutls_transport_set_vec_push_function(sess, VectorPush);
1063 #else
1064                 gnutls_transport_set_push_function(sess, gnutls_push_wrapper);
1065 #endif
1066                 gnutls_transport_set_pull_function(sess, gnutls_pull_wrapper);
1067                 GetProfile().SetupSession(sess);
1068
1069                 sock->AddIOHook(this);
1070                 Handshake(sock);
1071         }
1072
1073         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
1074         {
1075                 CloseSession();
1076         }
1077
1078         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
1079         {
1080                 // Finish handshake if needed
1081                 int prepret = PrepareIO(user);
1082                 if (prepret <= 0)
1083                         return prepret;
1084
1085                 // If we resumed the handshake then this->status will be ISSL_HANDSHAKEN.
1086                 {
1087                         GnuTLS::DataReader reader(sess);
1088                         int ret = reader.ret();
1089                         if (ret > 0)
1090                         {
1091                                 reader.appendto(recvq);
1092                                 // Schedule a read if there is still data in the GnuTLS buffer
1093                                 if (gnutls_record_check_pending(sess) > 0)
1094                                         SocketEngine::ChangeEventMask(user, FD_ADD_TRIAL_READ);
1095                                 return 1;
1096                         }
1097                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
1098                         {
1099                                 return 0;
1100                         }
1101                         else if (ret == 0)
1102                         {
1103                                 user->SetError("Connection closed");
1104                                 CloseSession();
1105                                 return -1;
1106                         }
1107                         else
1108                         {
1109                                 user->SetError(gnutls_strerror(ret));
1110                                 CloseSession();
1111                                 return -1;
1112                         }
1113                 }
1114         }
1115
1116         int OnStreamSocketWrite(StreamSocket* user, StreamSocket::SendQueue& sendq) CXX11_OVERRIDE
1117         {
1118                 // Finish handshake if needed
1119                 int prepret = PrepareIO(user);
1120                 if (prepret <= 0)
1121                         return prepret;
1122
1123                 // Session is ready for transferring application data
1124
1125 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1126                 while (true)
1127                 {
1128                         // If there is something in the GnuTLS buffer try to send() it
1129                         int ret = FlushBuffer(user);
1130                         if (ret <= 0)
1131                                 return ret; // Couldn't flush entire buffer, retry later (or close on error)
1132
1133                         // GnuTLS buffer is empty, if the sendq is empty as well then break to set FD_WANT_NO_WRITE
1134                         if (sendq.empty())
1135                                 break;
1136
1137                         // GnuTLS buffer is empty but sendq is not, begin sending data from the sendq
1138                         gnutls_record_cork(this->sess);
1139                         while ((!sendq.empty()) && (gbuffersize < GetProfile().GetOutgoingRecordSize()))
1140                         {
1141                                 const StreamSocket::SendQueue::Element& elem = sendq.front();
1142                                 gbuffersize += elem.length();
1143                                 ret = gnutls_record_send(this->sess, elem.data(), elem.length());
1144                                 if (ret < 0)
1145                                 {
1146                                         CloseSession();
1147                                         return -1;
1148                                 }
1149                                 sendq.pop_front();
1150                         }
1151                 }
1152 #else
1153                 int ret = 0;
1154
1155                 while (!sendq.empty())
1156                 {
1157                         FlattenSendQueue(sendq, GetProfile().GetOutgoingRecordSize());
1158                         const StreamSocket::SendQueue::Element& buffer = sendq.front();
1159                         ret = HandleWriteRet(user, gnutls_record_send(this->sess, buffer.data(), buffer.length()));
1160
1161                         if (ret <= 0)
1162                                 return ret;
1163                         else if (ret < (int)buffer.length())
1164                         {
1165                                 sendq.erase_front(ret);
1166                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
1167                                 return 0;
1168                         }
1169
1170                         // Wrote entire record, continue sending
1171                         sendq.pop_front();
1172                 }
1173 #endif
1174
1175                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_WRITE);
1176                 return 1;
1177         }
1178
1179         void GetCiphersuite(std::string& out) const CXX11_OVERRIDE
1180         {
1181                 if (!IsHandshakeDone())
1182                         return;
1183                 out.append(UnknownIfNULL(gnutls_protocol_get_name(gnutls_protocol_get_version(sess)))).push_back('-');
1184                 out.append(UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess)))).push_back('-');
1185                 out.append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).push_back('-');
1186                 out.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess))));
1187         }
1188
1189         bool GetServerName(std::string& out) const CXX11_OVERRIDE
1190         {
1191                 std::vector<char> nameBuffer;
1192                 size_t nameLength = 0;
1193                 unsigned int nameType = GNUTLS_NAME_DNS;
1194
1195                 // First, determine the size of the hostname.
1196                 if (gnutls_server_name_get(sess, &nameBuffer[0], &nameLength, &nameType, 0) != GNUTLS_E_SHORT_MEMORY_BUFFER)
1197                         return false;
1198
1199                 // Then retrieve the hostname.
1200                 nameBuffer.resize(nameLength);
1201                 if (gnutls_server_name_get(sess, &nameBuffer[0], &nameLength, &nameType, 0) != GNUTLS_E_SUCCESS)
1202                         return false;
1203
1204                 out.append(&nameBuffer[0]);
1205                 return true;
1206         }
1207
1208         GnuTLS::Profile& GetProfile();
1209         bool IsHandshakeDone() const { return (status == ISSL_HANDSHAKEN); }
1210 };
1211
1212 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)
1213 {
1214 #ifndef GNUTLS_NEW_CERT_CALLBACK_API
1215         st->type = GNUTLS_CRT_X509;
1216 #else
1217         st->cert_type = GNUTLS_CRT_X509;
1218         st->key_type = GNUTLS_PRIVKEY_X509;
1219 #endif
1220         StreamSocket* sock = reinterpret_cast<StreamSocket*>(gnutls_transport_get_ptr(sess));
1221         GnuTLS::X509Credentials& cred = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod))->GetProfile().GetX509Credentials();
1222
1223         st->ncerts = cred.certs.size();
1224         st->cert.x509 = cred.certs.raw();
1225         st->key.x509 = cred.key.get();
1226         st->deinit_all = 0;
1227
1228         return 0;
1229 }
1230
1231 class GnuTLSIOHookProvider : public IOHookProvider
1232 {
1233         GnuTLS::Profile profile;
1234
1235  public:
1236         GnuTLSIOHookProvider(Module* mod, GnuTLS::Profile::Config& config)
1237                 : IOHookProvider(mod, "ssl/" + config.name, IOHookProvider::IOH_SSL)
1238                 , profile(config)
1239         {
1240                 ServerInstance->Modules->AddService(*this);
1241         }
1242
1243         ~GnuTLSIOHookProvider()
1244         {
1245                 ServerInstance->Modules->DelService(*this);
1246         }
1247
1248         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
1249         {
1250                 new GnuTLSIOHook(this, sock, GNUTLS_SERVER);
1251         }
1252
1253         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
1254         {
1255                 new GnuTLSIOHook(this, sock, GNUTLS_CLIENT);
1256         }
1257
1258         GnuTLS::Profile& GetProfile() { return profile; }
1259 };
1260
1261 GnuTLS::Profile& GnuTLSIOHook::GetProfile()
1262 {
1263         IOHookProvider* hookprov = prov;
1264         return static_cast<GnuTLSIOHookProvider*>(hookprov)->GetProfile();
1265 }
1266
1267 class ModuleSSLGnuTLS : public Module
1268 {
1269         typedef std::vector<reference<GnuTLSIOHookProvider> > ProfileList;
1270
1271         // First member of the class, gets constructed first and destructed last
1272         GnuTLS::Init libinit;
1273         ProfileList profiles;
1274
1275         void ReadProfiles()
1276         {
1277                 // First, store all profiles in a new, temporary container. If no problems occur, swap the two
1278                 // containers; this way if something goes wrong we can go back and continue using the current profiles,
1279                 // avoiding unpleasant situations where no new SSL connections are possible.
1280                 ProfileList newprofiles;
1281
1282                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
1283                 if (tags.first == tags.second)
1284                 {
1285                         // No <sslprofile> tags found, create a profile named "gnutls" from settings in the <gnutls> block
1286                         const std::string defname = "gnutls";
1287                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
1288                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found; using settings from the <gnutls> tag");
1289
1290                         try
1291                         {
1292                                 GnuTLS::Profile::Config profileconfig(defname, tag);
1293                                 newprofiles.push_back(new GnuTLSIOHookProvider(this, profileconfig));
1294                         }
1295                         catch (CoreException& ex)
1296                         {
1297                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
1298                         }
1299                 }
1300
1301                 for (ConfigIter i = tags.first; i != tags.second; ++i)
1302                 {
1303                         ConfigTag* tag = i->second;
1304                         if (!stdalgo::string::equalsci(tag->getString("provider"), "gnutls"))
1305                                 continue;
1306
1307                         std::string name = tag->getString("name");
1308                         if (name.empty())
1309                         {
1310                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
1311                                 continue;
1312                         }
1313
1314                         reference<GnuTLSIOHookProvider> prov;
1315                         try
1316                         {
1317                                 GnuTLS::Profile::Config profileconfig(name, tag);
1318                                 prov = new GnuTLSIOHookProvider(this, profileconfig);
1319                         }
1320                         catch (CoreException& ex)
1321                         {
1322                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
1323                         }
1324
1325                         newprofiles.push_back(prov);
1326                 }
1327
1328                 // New profiles are ok, begin using them
1329                 // Old profiles are deleted when their refcount drops to zero
1330                 for (ProfileList::iterator i = profiles.begin(); i != profiles.end(); ++i)
1331                 {
1332                         GnuTLSIOHookProvider& prov = **i;
1333                         ServerInstance->Modules.DelService(prov);
1334                 }
1335
1336                 profiles.swap(newprofiles);
1337         }
1338
1339  public:
1340         ModuleSSLGnuTLS()
1341         {
1342 #ifndef GNUTLS_HAS_RND
1343                 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
1344 #endif
1345                 thismod = this;
1346         }
1347
1348         void init() CXX11_OVERRIDE
1349         {
1350                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "GnuTLS lib version %s module was compiled for " GNUTLS_VERSION, gnutls_check_version(NULL));
1351                 ReadProfiles();
1352                 ServerInstance->GenRandom = RandGen::Call;
1353         }
1354
1355         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
1356         {
1357                 if(param != "ssl")
1358                         return;
1359
1360                 try
1361                 {
1362                         ReadProfiles();
1363                 }
1364                 catch (ModuleException& ex)
1365                 {
1366                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
1367                 }
1368         }
1369
1370         ~ModuleSSLGnuTLS()
1371         {
1372                 ServerInstance->GenRandom = &InspIRCd::DefaultGenRandom;
1373         }
1374
1375         void OnCleanup(ExtensionItem::ExtensibleType type, Extensible* item) CXX11_OVERRIDE
1376         {
1377                 if (type == ExtensionItem::EXT_USER)
1378                 {
1379                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
1380
1381                         if ((user) && (user->eh.GetModHook(this)))
1382                         {
1383                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
1384                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
1385                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
1386                         }
1387                 }
1388         }
1389
1390         Version GetVersion() CXX11_OVERRIDE
1391         {
1392                 return Version("Provides SSL support for clients", VF_VENDOR);
1393         }
1394
1395         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
1396         {
1397                 const GnuTLSIOHook* const iohook = static_cast<GnuTLSIOHook*>(user->eh.GetModHook(this));
1398                 if ((iohook) && (!iohook->IsHandshakeDone()))
1399                         return MOD_RES_DENY;
1400                 return MOD_RES_PASSTHRU;
1401         }
1402 };
1403
1404 MODULE_INIT(ModuleSSLGnuTLS)