src/modules/extra/m_ssl_openssl.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   6  *   Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
   7  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   8  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   9  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
  10  *
  11  * This file is part of InspIRCd.  InspIRCd is free software: you can
  12  * redistribute it and/or modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation, version 2.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24
  25 #include "inspircd.h"
  26 #include "iohook.h"
  27 #include "modules/ssl.h"
  28
  29 // Ignore OpenSSL deprecation warnings on OS X Lion and newer.
  30 #if defined __APPLE__
  31 # pragma GCC diagnostic ignored "-Wdeprecated-declarations"
  32 #endif
  33
  34 // Fix warnings about the use of `long long` on C++03.
  35 #if defined __clang__
  36 # pragma clang diagnostic ignored "-Wc++11-long-long"
  37 #elif defined __GNUC__
  38 # pragma GCC diagnostic ignored "-Wlong-long"
  39 #endif
  40
  41 #include <openssl/ssl.h>
  42 #include <openssl/err.h>
  43
  44 #ifdef _WIN32
  45 # pragma comment(lib, "ssleay32.lib")
  46 # pragma comment(lib, "libeay32.lib")
  47 #endif
  48
  49 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  50 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto") */
  51
  52 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  53
  54 static bool SelfSigned = false;
  55 static int exdataindex;
  56
  57 char* get_error()
  58 {
  59         return ERR_error_string(ERR_get_error(), NULL);
  60 }
  61
  62 static int OnVerify(int preverify_ok, X509_STORE_CTX* ctx);
  63 static void StaticSSLInfoCallback(const SSL* ssl, int where, int rc);
  64
  65 namespace OpenSSL
  66 {
  67         class Exception : public ModuleException
  68         {
  69          public:
  70                 Exception(const std::string& reason)
  71                         : ModuleException(reason) { }
  72         };
  73
  74         class DHParams
  75         {
  76                 DH* dh;
  77
  78          public:
  79                 DHParams(const std::string& filename)
  80                 {
  81                         BIO* dhpfile = BIO_new_file(filename.c_str(), "r");
  82                         if (dhpfile == NULL)
  83                                 throw Exception("Couldn't open DH file " + filename);
  84
  85                         dh = PEM_read_bio_DHparams(dhpfile, NULL, NULL, NULL);
  86                         BIO_free(dhpfile);
  87
  88                         if (!dh)
  89                                 throw Exception("Couldn't read DH params from file " + filename);
  90                 }
  91
  92                 ~DHParams()
  93                 {
  94                         DH_free(dh);
  95                 }
  96
  97                 DH* get()
  98                 {
  99                         return dh;
 100                 }
 101         };
 102
 103         class Context
 104         {
 105                 SSL_CTX* const ctx;
 106                 long ctx_options;
 107
 108          public:
 109                 Context(SSL_CTX* context)
 110                         : ctx(context)
 111                 {
 112                         // Sane default options for OpenSSL see https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
 113                         // and when choosing a cipher, use the server's preferences instead of the client preferences.
 114                         long opts = SSL_OP_NO_SSLv2 | SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_CIPHER_SERVER_PREFERENCE | SSL_OP_SINGLE_DH_USE;
 115                         // Only turn options on if they exist
 116 #ifdef SSL_OP_SINGLE_ECDH_USE
 117                         opts |= SSL_OP_SINGLE_ECDH_USE;
 118 #endif
 119 #ifdef SSL_OP_NO_TICKET
 120                         opts |= SSL_OP_NO_TICKET;
 121 #endif
 122
 123                         ctx_options = SSL_CTX_set_options(ctx, opts);
 124                         SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 125                         SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 126                         SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
 127                         SSL_CTX_set_info_callback(ctx, StaticSSLInfoCallback);
 128                 }
 129
 130                 ~Context()
 131                 {
 132                         SSL_CTX_free(ctx);
 133                 }
 134
 135                 bool SetDH(DHParams& dh)
 136                 {
 137                         ERR_clear_error();
 138                         return (SSL_CTX_set_tmp_dh(ctx, dh.get()) >= 0);
 139                 }
 140
 141 #ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
 142                 void SetECDH(const std::string& curvename)
 143                 {
 144                         int nid = OBJ_sn2nid(curvename.c_str());
 145                         if (nid == 0)
 146                                 throw Exception("Unknown curve: " + curvename);
 147
 148                         EC_KEY* eckey = EC_KEY_new_by_curve_name(nid);
 149                         if (!eckey)
 150                                 throw Exception("Unable to create EC key object");
 151
 152                         ERR_clear_error();
 153                         bool ret = (SSL_CTX_set_tmp_ecdh(ctx, eckey) >= 0);
 154                         EC_KEY_free(eckey);
 155                         if (!ret)
 156                                 throw Exception("Couldn't set ECDH parameters");
 157                 }
 158 #endif
 159
 160                 bool SetCiphers(const std::string& ciphers)
 161                 {
 162                         ERR_clear_error();
 163                         return SSL_CTX_set_cipher_list(ctx, ciphers.c_str());
 164                 }
 165
 166                 bool SetCerts(const std::string& filename)
 167                 {
 168                         ERR_clear_error();
 169                         return SSL_CTX_use_certificate_chain_file(ctx, filename.c_str());
 170                 }
 171
 172                 bool SetPrivateKey(const std::string& filename)
 173                 {
 174                         ERR_clear_error();
 175                         return SSL_CTX_use_PrivateKey_file(ctx, filename.c_str(), SSL_FILETYPE_PEM);
 176                 }
 177
 178                 bool SetCA(const std::string& filename)
 179                 {
 180                         ERR_clear_error();
 181                         return SSL_CTX_load_verify_locations(ctx, filename.c_str(), 0);
 182                 }
 183
 184                 long GetDefaultContextOptions() const
 185                 {
 186                         return ctx_options;
 187                 }
 188
 189                 long SetRawContextOptions(long setoptions, long clearoptions)
 190                 {
 191                         // Clear everything
 192                         SSL_CTX_clear_options(ctx, SSL_CTX_get_options(ctx));
 193
 194                         // Set the default options and what is in the conf
 195                         SSL_CTX_set_options(ctx, ctx_options | setoptions);
 196                         return SSL_CTX_clear_options(ctx, clearoptions);
 197                 }
 198
 199                 SSL* CreateServerSession()
 200                 {
 201                         SSL* sess = SSL_new(ctx);
 202                         SSL_set_accept_state(sess); // Act as server
 203                         return sess;
 204                 }
 205
 206                 SSL* CreateClientSession()
 207                 {
 208                         SSL* sess = SSL_new(ctx);
 209                         SSL_set_connect_state(sess); // Act as client
 210                         return sess;
 211                 }
 212         };
 213
 214         class Profile : public refcountbase
 215         {
 216                 /** Name of this profile
 217                  */
 218                 const std::string name;
 219
 220                 /** DH parameters in use
 221                  */
 222                 DHParams dh;
 223
 224                 /** OpenSSL makes us have two contexts, one for servers and one for clients
 225                  */
 226                 Context ctx;
 227                 Context clictx;
 228
 229                 /** Digest to use when generating fingerprints
 230                  */
 231                 const EVP_MD* digest;
 232
 233                 /** Last error, set by error_callback()
 234                  */
 235                 std::string lasterr;
 236
 237                 /** True if renegotiations are allowed, false if not
 238                  */
 239                 const bool allowrenego;
 240
 241                 static int error_callback(const char* str, size_t len, void* u)
 242                 {
 243                         Profile* profile = reinterpret_cast<Profile*>(u);
 244                         profile->lasterr = std::string(str, len - 1);
 245                         return 0;
 246                 }
 247
 248                 /** Set raw OpenSSL context (SSL_CTX) options from a config tag
 249                  * @param ctxname Name of the context, client or server
 250                  * @param tag Config tag defining this profile
 251                  * @param context Context object to manipulate
 252                  */
 253                 void SetContextOptions(const std::string& ctxname, ConfigTag* tag, Context& context)
 254                 {
 255                         long setoptions = tag->getInt(ctxname + "setoptions");
 256                         long clearoptions = tag->getInt(ctxname + "clearoptions");
 257 #ifdef SSL_OP_NO_COMPRESSION
 258                         if (!tag->getBool("compression", true))
 259                                 setoptions |= SSL_OP_NO_COMPRESSION;
 260 #endif
 261                         if (!tag->getBool("sslv3", true))
 262                                 setoptions |= SSL_OP_NO_SSLv3;
 263                         if (!tag->getBool("tlsv1", true))
 264                                 setoptions |= SSL_OP_NO_TLSv1;
 265
 266                         if (!setoptions && !clearoptions)
 267                                 return; // Nothing to do
 268
 269                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Setting %s %s context options, default: %ld set: %ld clear: %ld", name.c_str(), ctxname.c_str(), ctx.GetDefaultContextOptions(), setoptions, clearoptions);
 270                         long final = context.SetRawContextOptions(setoptions, clearoptions);
 271                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "%s %s context options: %ld", name.c_str(), ctxname.c_str(), final);
 272                 }
 273
 274          public:
 275                 Profile(const std::string& profilename, ConfigTag* tag)
 276                         : name(profilename)
 277                         , dh(ServerInstance->Config->Paths.PrependConfig(tag->getString("dhfile", "dh.pem")))
 278                         , ctx(SSL_CTX_new(SSLv23_server_method()))
 279                         , clictx(SSL_CTX_new(SSLv23_client_method()))
 280                         , allowrenego(tag->getBool("renegotiation", true))
 281                 {
 282                         if ((!ctx.SetDH(dh)) || (!clictx.SetDH(dh)))
 283                                 throw Exception("Couldn't set DH parameters");
 284
 285                         std::string hash = tag->getString("hash", "md5");
 286                         digest = EVP_get_digestbyname(hash.c_str());
 287                         if (digest == NULL)
 288                                 throw Exception("Unknown hash type " + hash);
 289
 290                         std::string ciphers = tag->getString("ciphers");
 291                         if (!ciphers.empty())
 292                         {
 293                                 if ((!ctx.SetCiphers(ciphers)) || (!clictx.SetCiphers(ciphers)))
 294                                 {
 295                                         ERR_print_errors_cb(error_callback, this);
 296                                         throw Exception("Can't set cipher list to \"" + ciphers + "\" " + lasterr);
 297                                 }
 298                         }
 299
 300 #ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
 301                         std::string curvename = tag->getString("ecdhcurve", "prime256v1");
 302                         if (!curvename.empty())
 303                                 ctx.SetECDH(curvename);
 304 #endif
 305
 306                         SetContextOptions("server", tag, ctx);
 307                         SetContextOptions("client", tag, clictx);
 308
 309                         /* Load our keys and certificates
 310                          * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 311                          */
 312                         std::string filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("certfile", "cert.pem"));
 313                         if ((!ctx.SetCerts(filename)) || (!clictx.SetCerts(filename)))
 314                         {
 315                                 ERR_print_errors_cb(error_callback, this);
 316                                 throw Exception("Can't read certificate file: " + lasterr);
 317                         }
 318
 319                         filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("keyfile", "key.pem"));
 320                         if ((!ctx.SetPrivateKey(filename)) || (!clictx.SetPrivateKey(filename)))
 321                         {
 322                                 ERR_print_errors_cb(error_callback, this);
 323                                 throw Exception("Can't read key file: " + lasterr);
 324                         }
 325
 326                         // Load the CAs we trust
 327                         filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("cafile", "ca.pem"));
 328                         if ((!ctx.SetCA(filename)) || (!clictx.SetCA(filename)))
 329                         {
 330                                 ERR_print_errors_cb(error_callback, this);
 331                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Can't read CA list from %s. This is only a problem if you want to verify client certificates, otherwise it's safe to ignore this message. Error: %s", filename.c_str(), lasterr.c_str());
 332                         }
 333                 }
 334
 335                 const std::string& GetName() const { return name; }
 336                 SSL* CreateServerSession() { return ctx.CreateServerSession(); }
 337                 SSL* CreateClientSession() { return clictx.CreateClientSession(); }
 338                 const EVP_MD* GetDigest() { return digest; }
 339                 bool AllowRenegotiation() const { return allowrenego; }
 340         };
 341 }
 342
 343 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
 344 {
 345         /* XXX: This will allow self signed certificates.
 346          * In the future if we want an option to not allow this,
 347          * we can just return preverify_ok here, and openssl
 348          * will boot off self-signed and invalid peer certs.
 349          */
 350         int ve = X509_STORE_CTX_get_error(ctx);
 351
 352         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 353
 354         return 1;
 355 }
 356
 357 class OpenSSLIOHook : public SSLIOHook
 358 {
 359  private:
 360         SSL* sess;
 361         issl_status status;
 362         bool data_to_write;
 363         reference<OpenSSL::Profile> profile;
 364
 365         // Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
 366         int Handshake(StreamSocket* user)
 367         {
 368                 ERR_clear_error();
 369                 int ret = SSL_do_handshake(sess);
 370                 if (ret < 0)
 371                 {
 372                         int err = SSL_get_error(sess, ret);
 373
 374                         if (err == SSL_ERROR_WANT_READ)
 375                         {
 376                                 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 377                                 this->status = ISSL_HANDSHAKING;
 378                                 return 0;
 379                         }
 380                         else if (err == SSL_ERROR_WANT_WRITE)
 381                         {
 382                                 SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 383                                 this->status = ISSL_HANDSHAKING;
 384                                 return 0;
 385                         }
 386                         else
 387                         {
 388                                 CloseSession();
 389                                 return -1;
 390                         }
 391                 }
 392                 else if (ret > 0)
 393                 {
 394                         // Handshake complete.
 395                         VerifyCertificate();
 396
 397                         status = ISSL_OPEN;
 398
 399                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 400
 401                         return 1;
 402                 }
 403                 else if (ret == 0)
 404                 {
 405                         CloseSession();
 406                 }
 407                 return -1;
 408         }
 409
 410         void CloseSession()
 411         {
 412                 if (sess)
 413                 {
 414                         SSL_shutdown(sess);
 415                         SSL_free(sess);
 416                 }
 417                 sess = NULL;
 418                 certificate = NULL;
 419                 status = ISSL_NONE;
 420         }
 421
 422         void VerifyCertificate()
 423         {
 424                 X509* cert;
 425                 ssl_cert* certinfo = new ssl_cert;
 426                 this->certificate = certinfo;
 427                 unsigned int n;
 428                 unsigned char md[EVP_MAX_MD_SIZE];
 429
 430                 cert = SSL_get_peer_certificate(sess);
 431
 432                 if (!cert)
 433                 {
 434                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 435                         return;
 436                 }
 437
 438                 certinfo->invalid = (SSL_get_verify_result(sess) != X509_V_OK);
 439
 440                 if (!SelfSigned)
 441                 {
 442                         certinfo->unknownsigner = false;
 443                         certinfo->trusted = true;
 444                 }
 445                 else
 446                 {
 447                         certinfo->unknownsigner = true;
 448                         certinfo->trusted = false;
 449                 }
 450
 451                 char buf[512];
 452                 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf));
 453                 certinfo->dn = buf;
 454                 // Make sure there are no chars in the string that we consider invalid
 455                 if (certinfo->dn.find_first_of("\r\n") != std::string::npos)
 456                         certinfo->dn.clear();
 457
 458                 X509_NAME_oneline(X509_get_issuer_name(cert), buf, sizeof(buf));
 459                 certinfo->issuer = buf;
 460                 if (certinfo->issuer.find_first_of("\r\n") != std::string::npos)
 461                         certinfo->issuer.clear();
 462
 463                 if (!X509_digest(cert, profile->GetDigest(), md, &n))
 464                 {
 465                         certinfo->error = "Out of memory generating fingerprint";
 466                 }
 467                 else
 468                 {
 469                         certinfo->fingerprint = BinToHex(md, n);
 470                 }
 471
 472                 if ((ASN1_UTCTIME_cmp_time_t(X509_get_notAfter(cert), ServerInstance->Time()) == -1) || (ASN1_UTCTIME_cmp_time_t(X509_get_notBefore(cert), ServerInstance->Time()) == 0))
 473                 {
 474                         certinfo->error = "Not activated, or expired certificate";
 475                 }
 476
 477                 X509_free(cert);
 478         }
 479
 480 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 481         void SSLInfoCallback(int where, int rc)
 482         {
 483                 if ((where & SSL_CB_HANDSHAKE_START) && (status == ISSL_OPEN))
 484                 {
 485                         if (profile->AllowRenegotiation())
 486                                 return;
 487
 488                         // The other side is trying to renegotiate, kill the connection and change status
 489                         // to ISSL_NONE so CheckRenego() closes the session
 490                         status = ISSL_NONE;
 491                         SocketEngine::Shutdown(SSL_get_fd(sess), 2);
 492                 }
 493         }
 494
 495         bool CheckRenego(StreamSocket* sock)
 496         {
 497                 if (status != ISSL_NONE)
 498                         return true;
 499
 500                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Session %p killed, attempted to renegotiate", (void*)sess);
 501                 CloseSession();
 502                 sock->SetError("Renegotiation is not allowed");
 503                 return false;
 504         }
 505 #endif
 506
 507         // Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
 508         int PrepareIO(StreamSocket* sock)
 509         {
 510                 if (status == ISSL_OPEN)
 511                         return 1;
 512                 else if (status == ISSL_HANDSHAKING)
 513                 {
 514                         // The handshake isn't finished, try to finish it
 515                         return Handshake(sock);
 516                 }
 517
 518                 CloseSession();
 519                 return -1;
 520         }
 521
 522         // Calls our private SSLInfoCallback()
 523         friend void StaticSSLInfoCallback(const SSL* ssl, int where, int rc);
 524
 525  public:
 526         OpenSSLIOHook(IOHookProvider* hookprov, StreamSocket* sock, SSL* session, const reference<OpenSSL::Profile>& sslprofile)
 527                 : SSLIOHook(hookprov)
 528                 , sess(session)
 529                 , status(ISSL_NONE)
 530                 , data_to_write(false)
 531                 , profile(sslprofile)
 532         {
 533                 if (sess == NULL)
 534                         return;
 535                 if (SSL_set_fd(sess, sock->GetFd()) == 0)
 536                         throw ModuleException("Can't set fd with SSL_set_fd: " + ConvToStr(sock->GetFd()));
 537
 538                 SSL_set_ex_data(sess, exdataindex, this);
 539                 sock->AddIOHook(this);
 540                 Handshake(sock);
 541         }
 542
 543         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
 544         {
 545                 CloseSession();
 546         }
 547
 548         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
 549         {
 550                 // Finish handshake if needed
 551                 int prepret = PrepareIO(user);
 552                 if (prepret <= 0)
 553                         return prepret;
 554
 555                 // If we resumed the handshake then this->status will be ISSL_OPEN
 556                 {
 557                         ERR_clear_error();
 558                         char* buffer = ServerInstance->GetReadBuffer();
 559                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 560                         int ret = SSL_read(sess, buffer, bufsiz);
 561
 562 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 563                         if (!CheckRenego(user))
 564                                 return -1;
 565 #endif
 566
 567                         if (ret > 0)
 568                         {
 569                                 recvq.append(buffer, ret);
 570                                 if (data_to_write)
 571                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE);
 572                                 return 1;
 573                         }
 574                         else if (ret == 0)
 575                         {
 576                                 // Client closed connection.
 577                                 CloseSession();
 578                                 user->SetError("Connection closed");
 579                                 return -1;
 580                         }
 581                         else // if (ret < 0)
 582                         {
 583                                 int err = SSL_get_error(sess, ret);
 584
 585                                 if (err == SSL_ERROR_WANT_READ)
 586                                 {
 587                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ);
 588                                         return 0;
 589                                 }
 590                                 else if (err == SSL_ERROR_WANT_WRITE)
 591                                 {
 592                                         SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 593                                         return 0;
 594                                 }
 595                                 else
 596                                 {
 597                                         CloseSession();
 598                                         return -1;
 599                                 }
 600                         }
 601                 }
 602         }
 603
 604         int OnStreamSocketWrite(StreamSocket* user, std::string& buffer) CXX11_OVERRIDE
 605         {
 606                 // Finish handshake if needed
 607                 int prepret = PrepareIO(user);
 608                 if (prepret <= 0)
 609                         return prepret;
 610
 611                 data_to_write = true;
 612
 613                 // Session is ready for transferring application data
 614                 {
 615                         ERR_clear_error();
 616                         int ret = SSL_write(sess, buffer.data(), buffer.size());
 617
 618 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 619                         if (!CheckRenego(user))
 620                                 return -1;
 621 #endif
 622
 623                         if (ret == (int)buffer.length())
 624                         {
 625                                 data_to_write = false;
 626                                 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 627                                 return 1;
 628                         }
 629                         else if (ret > 0)
 630                         {
 631                                 buffer.erase(0, ret);
 632                                 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 633                                 return 0;
 634                         }
 635                         else if (ret == 0)
 636                         {
 637                                 CloseSession();
 638                                 return -1;
 639                         }
 640                         else // if (ret < 0)
 641                         {
 642                                 int err = SSL_get_error(sess, ret);
 643
 644                                 if (err == SSL_ERROR_WANT_WRITE)
 645                                 {
 646                                         SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 647                                         return 0;
 648                                 }
 649                                 else if (err == SSL_ERROR_WANT_READ)
 650                                 {
 651                                         SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ);
 652                                         return 0;
 653                                 }
 654                                 else
 655                                 {
 656                                         CloseSession();
 657                                         return -1;
 658                                 }
 659                         }
 660                 }
 661         }
 662
 663         void TellCiphersAndFingerprint(LocalUser* user)
 664         {
 665                 if (sess)
 666                 {
 667                         std::string text = "*** You are connected using SSL cipher '";
 668                         GetCiphersuite(text);
 669                         text += '\'';
 670                         const std::string& fingerprint = certificate->fingerprint;
 671                         if (!fingerprint.empty())
 672                                 text += " and your SSL certificate fingerprint is " + fingerprint;
 673
 674                         user->WriteNotice(text);
 675                 }
 676         }
 677
 678         void GetCiphersuite(std::string& out) const
 679         {
 680                 out.append(SSL_get_version(sess)).push_back('-');
 681                 out.append(SSL_get_cipher(sess));
 682         }
 683
 684         bool IsHandshakeDone() const { return (status == ISSL_OPEN); }
 685 };
 686
 687 static void StaticSSLInfoCallback(const SSL* ssl, int where, int rc)
 688 {
 689 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 690         OpenSSLIOHook* hook = static_cast<OpenSSLIOHook*>(SSL_get_ex_data(ssl, exdataindex));
 691         hook->SSLInfoCallback(where, rc);
 692 #endif
 693 }
 694
 695 class OpenSSLIOHookProvider : public refcountbase, public IOHookProvider
 696 {
 697         reference<OpenSSL::Profile> profile;
 698
 699  public:
 700         OpenSSLIOHookProvider(Module* mod, reference<OpenSSL::Profile>& prof)
 701                 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
 702                 , profile(prof)
 703         {
 704                 ServerInstance->Modules->AddService(*this);
 705         }
 706
 707         ~OpenSSLIOHookProvider()
 708         {
 709                 ServerInstance->Modules->DelService(*this);
 710         }
 711
 712         void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
 713         {
 714                 new OpenSSLIOHook(this, sock, profile->CreateServerSession(), profile);
 715         }
 716
 717         void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
 718         {
 719                 new OpenSSLIOHook(this, sock, profile->CreateClientSession(), profile);
 720         }
 721 };
 722
 723 class ModuleSSLOpenSSL : public Module
 724 {
 725         typedef std::vector<reference<OpenSSLIOHookProvider> > ProfileList;
 726
 727         ProfileList profiles;
 728
 729         void ReadProfiles()
 730         {
 731                 ProfileList newprofiles;
 732                 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
 733                 if (tags.first == tags.second)
 734                 {
 735                         // Create a default profile named "openssl"
 736                         const std::string defname = "openssl";
 737                         ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
 738                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found, using settings from the <openssl> tag");
 739
 740                         try
 741                         {
 742                                 reference<OpenSSL::Profile> profile(new OpenSSL::Profile(defname, tag));
 743                                 newprofiles.push_back(new OpenSSLIOHookProvider(this, profile));
 744                         }
 745                         catch (OpenSSL::Exception& ex)
 746                         {
 747                                 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
 748                         }
 749                 }
 750
 751                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 752                 {
 753                         ConfigTag* tag = i->second;
 754                         if (tag->getString("provider") != "openssl")
 755                                 continue;
 756
 757                         std::string name = tag->getString("name");
 758                         if (name.empty())
 759                         {
 760                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
 761                                 continue;
 762                         }
 763
 764                         reference<OpenSSL::Profile> profile;
 765                         try
 766                         {
 767                                 profile = new OpenSSL::Profile(name, tag);
 768                         }
 769                         catch (CoreException& ex)
 770                         {
 771                                 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
 772                         }
 773
 774                         newprofiles.push_back(new OpenSSLIOHookProvider(this, profile));
 775                 }
 776
 777                 profiles.swap(newprofiles);
 778         }
 779
 780  public:
 781         ModuleSSLOpenSSL()
 782         {
 783                 // Initialize OpenSSL
 784                 SSL_library_init();
 785                 SSL_load_error_strings();
 786         }
 787
 788         void init() CXX11_OVERRIDE
 789         {
 790                 // Register application specific data
 791                 char exdatastr[] = "inspircd";
 792                 exdataindex = SSL_get_ex_new_index(0, exdatastr, NULL, NULL, NULL);
 793                 if (exdataindex < 0)
 794                         throw ModuleException("Failed to register application specific data");
 795
 796                 ReadProfiles();
 797         }
 798
 799         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
 800         {
 801                 if (param != "ssl")
 802                         return;
 803
 804                 try
 805                 {
 806                         ReadProfiles();
 807                 }
 808                 catch (ModuleException& ex)
 809                 {
 810                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
 811                 }
 812         }
 813
 814         void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
 815         {
 816                 IOHook* hook = user->eh.GetIOHook();
 817                 if (hook && hook->prov->creator == this)
 818                         static_cast<OpenSSLIOHook*>(hook)->TellCiphersAndFingerprint(user);
 819         }
 820
 821         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
 822         {
 823                 if (target_type == TYPE_USER)
 824                 {
 825                         LocalUser* user = IS_LOCAL((User*)item);
 826
 827                         if (user && user->eh.GetIOHook() && user->eh.GetIOHook()->prov->creator == this)
 828                         {
 829                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 830                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 831                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 832                         }
 833                 }
 834         }
 835
 836         ModResult OnCheckReady(LocalUser* user) CXX11_OVERRIDE
 837         {
 838                 if ((user->eh.GetIOHook()) && (user->eh.GetIOHook()->prov->creator == this))
 839                 {
 840                         OpenSSLIOHook* iohook = static_cast<OpenSSLIOHook*>(user->eh.GetIOHook());
 841                         if (!iohook->IsHandshakeDone())
 842                                 return MOD_RES_DENY;
 843                 }
 844
 845                 return MOD_RES_PASSTHRU;
 846         }
 847
 848         Version GetVersion() CXX11_OVERRIDE
 849         {
 850                 return Version("Provides SSL support for clients", VF_VENDOR);
 851         }
 852 };
 853
 854 MODULE_INIT(ModuleSSLOpenSSL)