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