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("ubuntu" "1.0" "13.10") libgcrypt11-dev
  32 /// $PackageInfo: require_system("ubuntu" "14.04") gnutls-bin libgnutls-dev pkg-config
  33
  34 #include "inspircd.h"
  35 #include "modules/ssl.h"
  36 #include <memory>
  37
  38 // Fix warnings about the use of commas at end of enumerator lists on C++03.
  39 #if defined __clang__
  40 # pragma clang diagnostic ignored "-Wc++11-extensions"
  41 #elif defined __GNUC__
  42 # if __GNUC__ < 6
  43 #  pragma GCC diagnostic ignored "-pedantic"
  44 # else
  45 #  pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  46 # endif
  47 #endif
  48
  49 #include <gnutls/gnutls.h>
  50 #include <gnutls/x509.h>
  51
  52 #ifndef GNUTLS_VERSION_NUMBER
  53 #define GNUTLS_VERSION_NUMBER LIBGNUTLS_VERSION_NUMBER
  54 #define GNUTLS_VERSION LIBGNUTLS_VERSION
  55 #endif
  56
  57 // Check if the GnuTLS library is at least version major.minor.patch
  58 #define INSPIRCD_GNUTLS_HAS_VERSION(major, minor, patch) (GNUTLS_VERSION_NUMBER >= ((major << 16) | (minor << 8) | patch))
  59
  60 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 9, 8)
  61 #define GNUTLS_HAS_MAC_GET_ID
  62 #include <gnutls/crypto.h>
  63 #endif
  64
  65 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 12, 0)
  66 # define GNUTLS_HAS_RND
  67 #else
  68 # include <gcrypt.h>
  69 #endif
  70
  71 #ifdef _WIN32
  72 # pragma comment(lib, "libgnutls-30.lib")
  73 #endif
  74
  75 // These don't exist in older GnuTLS versions
  76 #if INSPIRCD_GNUTLS_HAS_VERSION(2, 1, 7)
  77 #define GNUTLS_NEW_PRIO_API
  78 #endif
  79
  80 #if (!INSPIRCD_GNUTLS_HAS_VERSION(2, 0, 0))
  81 typedef gnutls_certificate_credentials_t gnutls_certificate_credentials;
  82 typedef gnutls_dh_params_t gnutls_dh_params;
  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 : public HandlerBase2<void, char*, size_t>
 114 {
 115  public:
 116         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 (hashname == "md5")
 191                                 hash = GNUTLS_DIG_MD5;
 192                         else if (hashname == "sha1")
 193                                 hash = GNUTLS_DIG_SHA1;
 194 #ifdef INSPIRCD_GNUTLS_ENABLE_SHA256_FINGERPRINT
 195                         else if (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 : public refcountbase
 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                 Profile(const std::string& profilename, const std::string& certstr, const std::string& keystr,
 598                                 std::auto_ptr<DHParams>& DH, unsigned int mindh, const std::string& hashstr,
 599                                 const std::string& priostr, std::auto_ptr<X509CertList>& CA, std::auto_ptr<X509CRL>& CRL,
 600                                 unsigned int recsize, bool Requestclientcert)
 601                         : name(profilename)
 602                         , x509cred(certstr, keystr)
 603                         , min_dh_bits(mindh)
 604                         , hash(hashstr)
 605                         , priority(priostr)
 606                         , outrecsize(recsize)
 607                         , requestclientcert(Requestclientcert)
 608                 {
 609                         x509cred.SetDH(DH);
 610                         x509cred.SetCA(CA, CRL);
 611                 }
 612
 613                 static std::string ReadFile(const std::string& filename)
 614                 {
 615                         FileReader reader(filename);
 616                         std::string ret = reader.GetString();
 617                         if (ret.empty())
 618                                 throw Exception("Cannot read file " + filename);
 619                         return ret;
 620                 }
 621
 622                 static std::string GetPrioStr(const std::string& profilename, ConfigTag* tag)
 623                 {
 624                         // Use default priority string if this tag does not specify one
 625                         std::string priostr = GnuTLS::Priority::GetDefault();
 626                         bool found = tag->readString("priority", priostr);
 627                         // 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
 628                         if (!tag->getBool("strictpriority", found))
 629                         {
 630                                 std::string stripped = GnuTLS::Priority::RemoveUnknownTokens(priostr);
 631                                 if (stripped.empty())
 632                                 {
 633                                         // Stripping failed, act as if a prio string wasn't set
 634                                         stripped = GnuTLS::Priority::RemoveUnknownTokens(GnuTLS::Priority::GetDefault());
 635                                         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());
 636                                 }
 637                                 else if ((found) && (stripped != priostr))
 638                                 {
 639                                         // Prio string was set in the config and we ended up with something that works but different
 640                                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Priority string for profile \"%s\" contains unknown tokens, stripped to \"%s\"", profilename.c_str(), stripped.c_str());
 641                                 }
 642                                 priostr.swap(stripped);
 643                         }
 644                         return priostr;
 645                 }
 646
 647          public:
 648                 static reference<Profile> Create(const std::string& profilename, ConfigTag* tag)
 649                 {
 650                         std::string certstr = ReadFile(tag->getString("certfile", "cert.pem"));
 651                         std::string keystr = ReadFile(tag->getString("keyfile", "key.pem"));
 652
 653                         std::auto_ptr<DHParams> dh = DHParams::Import(ReadFile(tag->getString("dhfile", "dhparams.pem")));
 654
 655                         std::string priostr = GetPrioStr(profilename, tag);
 656                         unsigned int mindh = tag->getInt("mindhbits", 1024);
 657                         std::string hashstr = tag->getString("hash", "md5");
 658
 659                         // Load trusted CA and revocation list, if set
 660                         std::auto_ptr<X509CertList> ca;
 661                         std::auto_ptr<X509CRL> crl;
 662                         std::string filename = tag->getString("cafile");
 663                         if (!filename.empty())
 664                         {
 665                                 ca.reset(new X509CertList(ReadFile(filename)));
 666
 667                                 filename = tag->getString("crlfile");
 668                                 if (!filename.empty())
 669                                         crl.reset(new X509CRL(ReadFile(filename)));
 670                         }
 671
 672 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 673                         // If cork support is available outrecsize represents the (rough) max amount of data we give GnuTLS while corked
 674                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512);
 675 #else
 676                         unsigned int outrecsize = tag->getInt("outrecsize", 2048, 512, 16384);
 677 #endif
 678
 679                         const bool requestclientcert = tag->getBool("requestclientcert", true);
 680
 681                         return new Profile(profilename, certstr, keystr, dh, mindh, hashstr, priostr, ca, crl, outrecsize, requestclientcert);
 682                 }
 683
 684                 /** Set up the given session with the settings in this profile
 685                  */
 686                 void SetupSession(gnutls_session_t sess)
 687                 {
 688                         priority.SetupSession(sess);
 689                         x509cred.SetupSession(sess);
 690                         gnutls_dh_set_prime_bits(sess, min_dh_bits);
 691
 692                         // Request client certificate if enabled and we are a server, no-op if we're a client
 693                         if (requestclientcert)
 694                                 gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
 695                 }
 696
 697                 const std::string& GetName() const { return name; }
 698                 X509Credentials& GetX509Credentials() { return x509cred; }
 699                 gnutls_digest_algorithm_t GetHash() const { return hash.get(); }
 700                 unsigned int GetOutgoingRecordSize() const { return outrecsize; }
 701         };
 702 }
 703
 704 class GnuTLSIOHook : public SSLIOHook
 705 {
 706  private:
 707         gnutls_session_t sess;
 708         issl_status status;
 709         reference<GnuTLS::Profile> profile;
 710 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 711         size_t gbuffersize;
 712 #endif
 713
 714         void CloseSession()
 715         {
 716                 if (this->sess)
 717                 {
 718                         gnutls_bye(this->sess, GNUTLS_SHUT_WR);
 719                         gnutls_deinit(this->sess);
 720                 }
 721                 sess = NULL;
 722                 certificate = NULL;
 723                 status = ISSL_NONE;
 724         }
 725
 726         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 727         int Handshake(StreamSocket* user)
 728         {
 729                 int ret = gnutls_handshake(this->sess);
 730
 731                 if (ret < 0)
 732                 {
 733                         if(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
 734                         {
 735                                 // Handshake needs resuming later, read() or write() would have blocked.
 736                                 this->status = ISSL_HANDSHAKING;
 737
 738                                 if (gnutls_record_get_direction(this->sess) == 0)
 739                                 {
 740                                         // gnutls_handshake() wants to read() again.
 741                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 742                                 }
 743                                 else
 744                                 {
 745                                         // gnutls_handshake() wants to write() again.
 746                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 747                                 }
 748
 749                                 return 0;
 750                         }
 751                         else
 752                         {
 753                                 user->SetError("Handshake Failed - " + std::string(gnutls_strerror(ret)));
 754                                 CloseSession();
 755                                 return -1;
 756                         }
 757                 }
 758                 else
 759                 {
 760                         // Change the seesion state
 761                         this->status = ISSL_HANDSHAKEN;
 762
 763                         VerifyCertificate();
 764
 765                         // Finish writing, if any left
 766                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 767
 768                         return 1;
 769                 }
 770         }
 771
 772         void VerifyCertificate()
 773         {
 774                 unsigned int certstatus;
 775                 const gnutls_datum_t* cert_list;
 776                 int ret;
 777                 unsigned int cert_list_size;
 778                 gnutls_x509_crt_t cert;
 779                 char str[512];
 780                 unsigned char digest[512];
 781                 size_t digest_size = sizeof(digest);
 782                 size_t name_size = sizeof(str);
 783                 ssl_cert* certinfo = new ssl_cert;
 784                 this->certificate = certinfo;
 785
 786                 /* This verification function uses the trusted CAs in the credentials
 787                  * structure. So you must have installed one or more CA certificates.
 788                  */
 789                 ret = gnutls_certificate_verify_peers2(this->sess, &certstatus);
 790
 791                 if (ret < 0)
 792                 {
 793                         certinfo->error = std::string(gnutls_strerror(ret));
 794                         return;
 795                 }
 796
 797                 certinfo->invalid = (certstatus & GNUTLS_CERT_INVALID);
 798                 certinfo->unknownsigner = (certstatus & GNUTLS_CERT_SIGNER_NOT_FOUND);
 799                 certinfo->revoked = (certstatus & GNUTLS_CERT_REVOKED);
 800                 certinfo->trusted = !(certstatus & GNUTLS_CERT_SIGNER_NOT_CA);
 801
 802                 /* Up to here the process is the same for X.509 certificates and
 803                  * OpenPGP keys. From now on X.509 certificates are assumed. This can
 804                  * be easily extended to work with openpgp keys as well.
 805                  */
 806                 if (gnutls_certificate_type_get(this->sess) != GNUTLS_CRT_X509)
 807                 {
 808                         certinfo->error = "No X509 keys sent";
 809                         return;
 810                 }
 811
 812                 ret = gnutls_x509_crt_init(&cert);
 813                 if (ret < 0)
 814                 {
 815                         certinfo->error = gnutls_strerror(ret);
 816                         return;
 817                 }
 818
 819                 cert_list_size = 0;
 820                 cert_list = gnutls_certificate_get_peers(this->sess, &cert_list_size);
 821                 if (cert_list == NULL)
 822                 {
 823                         certinfo->error = "No certificate was found";
 824                         goto info_done_dealloc;
 825                 }
 826
 827                 /* This is not a real world example, since we only check the first
 828                  * certificate in the given chain.
 829                  */
 830
 831                 ret = gnutls_x509_crt_import(cert, &cert_list[0], GNUTLS_X509_FMT_DER);
 832                 if (ret < 0)
 833                 {
 834                         certinfo->error = gnutls_strerror(ret);
 835                         goto info_done_dealloc;
 836                 }
 837
 838                 if (gnutls_x509_crt_get_dn(cert, str, &name_size) == 0)
 839                 {
 840                         std::string& dn = certinfo->dn;
 841                         dn = str;
 842                         // Make sure there are no chars in the string that we consider invalid
 843                         if (dn.find_first_of("\r\n") != std::string::npos)
 844                                 dn.clear();
 845                 }
 846
 847                 name_size = sizeof(str);
 848                 if (gnutls_x509_crt_get_issuer_dn(cert, str, &name_size) == 0)
 849                 {
 850                         std::string& issuer = certinfo->issuer;
 851                         issuer = str;
 852                         if (issuer.find_first_of("\r\n") != std::string::npos)
 853                                 issuer.clear();
 854                 }
 855
 856                 if ((ret = gnutls_x509_crt_get_fingerprint(cert, profile->GetHash(), digest, &digest_size)) < 0)
 857                 {
 858                         certinfo->error = gnutls_strerror(ret);
 859                 }
 860                 else
 861                 {
 862                         certinfo->fingerprint = BinToHex(digest, digest_size);
 863                 }
 864
 865                 /* Beware here we do not check for errors.
 866                  */
 867                 if ((gnutls_x509_crt_get_expiration_time(cert) < ServerInstance->Time()) || (gnutls_x509_crt_get_activation_time(cert) > ServerInstance->Time()))
 868                 {
 869                         certinfo->error = "Not activated, or expired certificate";
 870                 }
 871
 872 info_done_dealloc:
 873                 gnutls_x509_crt_deinit(cert);
 874         }
 875
 876         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 877         int PrepareIO(StreamSocket* sock)
 878         {
 879                 if (status == ISSL_HANDSHAKEN)
 880                         return 1;
 881                 else if (status == ISSL_HANDSHAKING)
 882                 {
 883                         // The handshake isn't finished, try to finish it
 884                         return Handshake(sock);
 885                 }
 886
 887                 CloseSession();
 888                 sock->SetError("No SSL session");
 889                 return -1;
 890         }
 891
 892 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 893         int FlushBuffer(StreamSocket* sock)
 894         {
 895                 // If GnuTLS has some data buffered, write it
 896                 if (gbuffersize)
 897                         return HandleWriteRet(sock, gnutls_record_uncork(this->sess, 0));
 898                 return 1;
 899         }
 900 #endif
 901
 902         int HandleWriteRet(StreamSocket* sock, int ret)
 903         {
 904                 if (ret > 0)
 905                 {
 906 #ifdef INSPIRCD_GNUTLS_HAS_CORK
 907                         gbuffersize -= ret;
 908                         if (gbuffersize)
 909                         {
 910                                 SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 911                                 return 0;
 912                         }
 913 #endif
 914                         return ret;
 915                 }
 916                 else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED || ret == 0)
 917                 {
 918                         SocketEngine::ChangeEventMask(sock, FD_WANT_SINGLE_WRITE);
 919                         return 0;
 920                 }
 921                 else // (ret < 0)
 922                 {
 923                         sock->SetError(gnutls_strerror(ret));
 924                         CloseSession();
 925                         return -1;
 926                 }
 927         }
 928
 929         static const char* UnknownIfNULL(const char* str)
 930         {
 931                 return str ? str : "UNKNOWN";
 932         }
 933
 934         static ssize_t gnutls_pull_wrapper(gnutls_transport_ptr_t session_wrap, void* buffer, size_t size)
 935         {
 936                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
 937 #ifdef _WIN32
 938                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 939 #endif
 940
 941                 if (sock->GetEventMask() & FD_READ_WILL_BLOCK)
 942                 {
 943 #ifdef _WIN32
 944                         gnutls_transport_set_errno(session->sess, EAGAIN);
 945 #else
 946                         errno = EAGAIN;
 947 #endif
 948                         return -1;
 949                 }
 950
 951                 int rv = SocketEngine::Recv(sock, reinterpret_cast<char *>(buffer), size, 0);
 952
 953 #ifdef _WIN32
 954                 if (rv < 0)
 955                 {
 956                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
 957                          * and then set errno appropriately.
 958                          * The gnutls library may also have a different errno variable than us, see
 959                          * gnutls_transport_set_errno(3).
 960                          */
 961                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 962                 }
 963 #endif
 964
 965                 if (rv < (int)size)
 966                         SocketEngine::ChangeEventMask(sock, FD_READ_WILL_BLOCK);
 967                 return rv;
 968         }
 969
 970 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
 971         static ssize_t VectorPush(gnutls_transport_ptr_t transportptr, const giovec_t* iov, int iovcnt)
 972         {
 973                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(transportptr);
 974 #ifdef _WIN32
 975                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
 976 #endif
 977
 978                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
 979                 {
 980 #ifdef _WIN32
 981                         gnutls_transport_set_errno(session->sess, EAGAIN);
 982 #else
 983                         errno = EAGAIN;
 984 #endif
 985                         return -1;
 986                 }
 987
 988                 // Cast the giovec_t to iovec not to IOVector so the correct function is called on Windows
 989                 int ret = SocketEngine::WriteV(sock, reinterpret_cast<const iovec*>(iov), iovcnt);
 990 #ifdef _WIN32
 991                 // See the function above for more info about the usage of gnutls_transport_set_errno() on Windows
 992                 if (ret < 0)
 993                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
 994 #endif
 995
 996                 int size = 0;
 997                 for (int i = 0; i < iovcnt; i++)
 998                         size += iov[i].iov_len;
 999
1000                 if (ret < size)
1001                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
1002                 return ret;
1003         }
1004
1005 #else // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1006         static ssize_t gnutls_push_wrapper(gnutls_transport_ptr_t session_wrap, const void* buffer, size_t size)
1007         {
1008                 StreamSocket* sock = reinterpret_cast<StreamSocket*>(session_wrap);
1009 #ifdef _WIN32
1010                 GnuTLSIOHook* session = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod));
1011 #endif
1012
1013                 if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
1014                 {
1015 #ifdef _WIN32
1016                         gnutls_transport_set_errno(session->sess, EAGAIN);
1017 #else
1018                         errno = EAGAIN;
1019 #endif
1020                         return -1;
1021                 }
1022
1023                 int rv = SocketEngine::Send(sock, reinterpret_cast<const char *>(buffer), size, 0);
1024
1025 #ifdef _WIN32
1026                 if (rv < 0)
1027                 {
1028                         /* Windows doesn't use errno, but gnutls does, so check SocketEngine::IgnoreError()
1029                          * and then set errno appropriately.
1030                          * The gnutls library may also have a different errno variable than us, see
1031                          * gnutls_transport_set_errno(3).
1032                          */
1033                         gnutls_transport_set_errno(session->sess, SocketEngine::IgnoreError() ? EAGAIN : errno);
1034                 }
1035 #endif
1036
1037                 if (rv < (int)size)
1038                         SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
1039                 return rv;
1040         }
1041 #endif // INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1042
1043  public:
1044         GnuTLSIOHook(IOHookProvider* hookprov, StreamSocket* sock, inspircd_gnutls_session_init_flags_t flags, const reference<GnuTLS::Profile>& sslprofile)
1045                 : SSLIOHook(hookprov)
1046                 , sess(NULL)
1047                 , status(ISSL_NONE)
1048                 , profile(sslprofile)
1049 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1050                 , gbuffersize(0)
1051 #endif
1052         {
1053                 gnutls_init(&sess, flags);
1054                 gnutls_transport_set_ptr(sess, reinterpret_cast<gnutls_transport_ptr_t>(sock));
1055 #ifdef INSPIRCD_GNUTLS_HAS_VECTOR_PUSH
1056                 gnutls_transport_set_vec_push_function(sess, VectorPush);
1057 #else
1058                 gnutls_transport_set_push_function(sess, gnutls_push_wrapper);
1059 #endif
1060                 gnutls_transport_set_pull_function(sess, gnutls_pull_wrapper);
1061                 profile->SetupSession(sess);
1062
1063                 sock->AddIOHook(this);
1064                 Handshake(sock);
1065         }
1066
1067         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
1068         {
1069                 CloseSession();
1070         }
1071
1072         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
1073         {
1074                 // Finish handshake if needed
1075                 int prepret = PrepareIO(user);
1076                 if (prepret <= 0)
1077                         return prepret;
1078
1079                 // If we resumed the handshake then this->status will be ISSL_HANDSHAKEN.
1080                 {
1081                         GnuTLS::DataReader reader(sess);
1082                         int ret = reader.ret();
1083                         if (ret > 0)
1084                         {
1085                                 reader.appendto(recvq);
1086                                 // Schedule a read if there is still data in the GnuTLS buffer
1087                                 if (gnutls_record_check_pending(sess) > 0)
1088                                         SocketEngine::ChangeEventMask(user, FD_ADD_TRIAL_READ);
1089                                 return 1;
1090                         }
1091                         else if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
1092                         {
1093                                 return 0;
1094                         }
1095                         else if (ret == 0)
1096                         {
1097                                 user->SetError("Connection closed");
1098                                 CloseSession();
1099                                 return -1;
1100                         }
1101                         else
1102                         {
1103                                 user->SetError(gnutls_strerror(ret));
1104                                 CloseSession();
1105                                 return -1;
1106                         }
1107                 }
1108         }
1109
1110         int OnStreamSocketWrite(StreamSocket* user, StreamSocket::SendQueue& sendq) CXX11_OVERRIDE
1111         {
1112                 // Finish handshake if needed
1113                 int prepret = PrepareIO(user);
1114                 if (prepret <= 0)
1115                         return prepret;
1116
1117                 // Session is ready for transferring application data
1118
1119 #ifdef INSPIRCD_GNUTLS_HAS_CORK
1120                 while (true)
1121                 {
1122                         // If there is something in the GnuTLS buffer try to send() it
1123                         int ret = FlushBuffer(user);
1124                         if (ret <= 0)
1125                                 return ret; // Couldn't flush entire buffer, retry later (or close on error)
1126
1127                         // GnuTLS buffer is empty, if the sendq is empty as well then break to set FD_WANT_NO_WRITE
1128                         if (sendq.empty())
1129                                 break;
1130
1131                         // GnuTLS buffer is empty but sendq is not, begin sending data from the sendq
1132                         gnutls_record_cork(this->sess);
1133                         while ((!sendq.empty()) && (gbuffersize < profile->GetOutgoingRecordSize()))
1134                         {
1135                                 const StreamSocket::SendQueue::Element& elem = sendq.front();
1136                                 gbuffersize += elem.length();
1137                                 ret = gnutls_record_send(this->sess, elem.data(), elem.length());
1138                                 if (ret < 0)
1139                                 {
1140                                         CloseSession();
1141                                         return -1;
1142                                 }
1143                                 sendq.pop_front();
1144                         }
1145                 }
1146 #else
1147                 int ret = 0;
1148
1149                 while (!sendq.empty())
1150                 {
1151                         FlattenSendQueue(sendq, profile->GetOutgoingRecordSize());
1152                         const StreamSocket::SendQueue::Element& buffer = sendq.front();
1153                         ret = HandleWriteRet(user, gnutls_record_send(this->sess, buffer.data(), buffer.length()));
1154
1155                         if (ret <= 0)
1156                                 return ret;
1157                         else if (ret < (int)buffer.length())
1158                         {
1159                                 sendq.erase_front(ret);
1160                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
1161                                 return 0;
1162                         }
1163
1164                         // Wrote entire record, continue sending
1165                         sendq.pop_front();
1166                 }
1167 #endif
1168
1169                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_WRITE);
1170                 return 1;
1171         }
1172
1173         void GetCiphersuite(std::string& out) const CXX11_OVERRIDE
1174         {
1175                 if (!IsHandshakeDone())
1176                         return;
1177                 out.append(UnknownIfNULL(gnutls_protocol_get_name(gnutls_protocol_get_version(sess)))).push_back('-');
1178                 out.append(UnknownIfNULL(gnutls_kx_get_name(gnutls_kx_get(sess)))).push_back('-');
1179                 out.append(UnknownIfNULL(gnutls_cipher_get_name(gnutls_cipher_get(sess)))).push_back('-');
1180                 out.append(UnknownIfNULL(gnutls_mac_get_name(gnutls_mac_get(sess))));
1181         }
1182
1183         GnuTLS::Profile* GetProfile() { return profile; }
1184         bool IsHandshakeDone() const { return (status == ISSL_HANDSHAKEN); }
1185 };
1186
1187 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)
1188 {
1189 #ifndef GNUTLS_NEW_CERT_CALLBACK_API
1190         st->type = GNUTLS_CRT_X509;
1191 #else
1192         st->cert_type = GNUTLS_CRT_X509;
1193         st->key_type = GNUTLS_PRIVKEY_X509;
1194 #endif
1195         StreamSocket* sock = reinterpret_cast<StreamSocket*>(gnutls_transport_get_ptr(sess));
1196         GnuTLS::X509Credentials& cred = static_cast<GnuTLSIOHook*>(sock->GetModHook(thismod))->GetProfile()->GetX509Credentials();
1197
1198         st->ncerts = cred.certs.size();
1199         st->cert.x509 = cred.certs.raw();
1200         st->key.x509 = cred.key.get();
1201         st->deinit_all = 0;
1202
1203         return 0;
1204 }
1205
1206 class GnuTLSIOHookProvider : public refcountbase, public IOHookProvider
1207 {
1208         reference<GnuTLS::Profile> profile;
1209
1210  public:
1211         GnuTLSIOHookProvider(Module* mod, reference<GnuTLS::Profile>& prof)
1212                 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
1213                 , profile(prof)
1214         {
1215                 ServerInstance->Modules->AddService(*this);
1216         }
1217
1218         ~GnuTLSIOHookProvider()
1219         {
1220                 ServerInstance->Modules->DelService(*this);
1221         }
1222
1223         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
1224         {
1225                 new GnuTLSIOHook(this, sock, GNUTLS_SERVER, profile);
1226         }
1227
1228         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
1229         {
1230                 new GnuTLSIOHook(this, sock, GNUTLS_CLIENT, profile);
1231         }
1232 };
1233
1234 class ModuleSSLGnuTLS : public Module
1235 {
1236         typedef std::vector<reference<GnuTLSIOHookProvider> > ProfileList;
1237
1238         // First member of the class, gets constructed first and destructed last
1239         GnuTLS::Init libinit;
1240         RandGen randhandler;
1241         ProfileList profiles;
1242
1243         void ReadProfiles()
1244         {
1245                 // First, store all profiles in a new, temporary container. If no problems occur, swap the two
1246                 // containers; this way if something goes wrong we can go back and continue using the current profiles,
1247                 // avoiding unpleasant situations where no new SSL connections are possible.
1248                 ProfileList newprofiles;
1249
1250                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
1251                 if (tags.first == tags.second)
1252                 {
1253                         // No <sslprofile> tags found, create a profile named "gnutls" from settings in the <gnutls> block
1254                         const std::string defname = "gnutls";
1255                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
1256                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found; using settings from the <gnutls> tag");
1257
1258                         try
1259                         {
1260                                 reference<GnuTLS::Profile> profile(GnuTLS::Profile::Create(defname, tag));
1261                                 newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1262                         }
1263                         catch (CoreException& ex)
1264                         {
1265                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
1266                         }
1267                 }
1268
1269                 for (ConfigIter i = tags.first; i != tags.second; ++i)
1270                 {
1271                         ConfigTag* tag = i->second;
1272                         if (tag->getString("provider") != "gnutls")
1273                                 continue;
1274
1275                         std::string name = tag->getString("name");
1276                         if (name.empty())
1277                         {
1278                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
1279                                 continue;
1280                         }
1281
1282                         reference<GnuTLS::Profile> profile;
1283                         try
1284                         {
1285                                 profile = GnuTLS::Profile::Create(name, tag);
1286                         }
1287                         catch (CoreException& ex)
1288                         {
1289                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
1290                         }
1291
1292                         newprofiles.push_back(new GnuTLSIOHookProvider(this, profile));
1293                 }
1294
1295                 // New profiles are ok, begin using them
1296                 // Old profiles are deleted when their refcount drops to zero
1297                 profiles.swap(newprofiles);
1298         }
1299
1300  public:
1301         ModuleSSLGnuTLS()
1302         {
1303 #ifndef GNUTLS_HAS_RND
1304                 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
1305 #endif
1306                 thismod = this;
1307         }
1308
1309         void init() CXX11_OVERRIDE
1310         {
1311                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "GnuTLS lib version %s module was compiled for " GNUTLS_VERSION, gnutls_check_version(NULL));
1312                 ReadProfiles();
1313                 ServerInstance->GenRandom = &randhandler;
1314         }
1315
1316         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
1317         {
1318                 if(param != "ssl")
1319                         return;
1320
1321                 try
1322                 {
1323                         ReadProfiles();
1324                 }
1325                 catch (ModuleException& ex)
1326                 {
1327                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
1328                 }
1329         }
1330
1331         ~ModuleSSLGnuTLS()
1332         {
1333                 ServerInstance->GenRandom = &ServerInstance->HandleGenRandom;
1334         }
1335
1336         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
1337         {
1338                 if(target_type == TYPE_USER)
1339                 {
1340                         LocalUser* user = IS_LOCAL(static_cast<User*>(item));
1341
1342                         if ((user) && (user->eh.GetModHook(this)))
1343                         {
1344                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
1345                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
1346                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
1347                         }
1348                 }
1349         }
1350
1351         Version GetVersion() CXX11_OVERRIDE
1352         {
1353                 return Version("Provides SSL support for clients", VF_VENDOR);
1354         }
1355
1356         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
1357         {
1358                 const GnuTLSIOHook* const iohook = static_cast<GnuTLSIOHook*>(user->eh.GetModHook(this));
1359                 if ((iohook) && (!iohook->IsHandshakeDone()))
1360                         return MOD_RES_DENY;
1361                 return MOD_RES_PASSTHRU;
1362         }
1363 };
1364
1365 MODULE_INIT(ModuleSSLGnuTLS)