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  /* HACK: This prevents OpenSSL on OS X 10.7 and later from spewing deprecation
  25   * warnings for every single function call. As far as I (SaberUK) know, Apple
  26   * have no plans to remove OpenSSL so this warning just causes needless spam.
  27   */
  28 #ifdef __APPLE__
  29 # define __AVAILABILITYMACROS__
  30 # define DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER
  31 #endif
  32
  33 #include "inspircd.h"
  34 #include "iohook.h"
  35 #include <openssl/ssl.h>
  36 #include <openssl/err.h>
  37 #include "modules/ssl.h"
  38
  39 #ifdef _WIN32
  40 # pragma comment(lib, "libcrypto.lib")
  41 # pragma comment(lib, "libssl.lib")
  42 # pragma comment(lib, "user32.lib")
  43 # pragma comment(lib, "advapi32.lib")
  44 # pragma comment(lib, "libgcc.lib")
  45 # pragma comment(lib, "libmingwex.lib")
  46 # pragma comment(lib, "gdi32.lib")
  47 # undef MAX_DESCRIPTORS
  48 # define MAX_DESCRIPTORS 10000
  49 #endif
  50
  51 /* $ModDesc: Provides SSL support for clients */
  52
  53 /* $LinkerFlags: if("USE_FREEBSD_BASE_SSL") -lssl -lcrypto */
  54 /* $CompileFlags: if(!"USE_FREEBSD_BASE_SSL") pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  55 /* $LinkerFlags: if(!"USE_FREEBSD_BASE_SSL") rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  56
  57 /* $NoPedantic */
  58
  59
  60 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  61
  62 static bool SelfSigned = false;
  63
  64 char* get_error()
  65 {
  66         return ERR_error_string(ERR_get_error(), NULL);
  67 }
  68
  69 static int error_callback(const char *str, size_t len, void *u);
  70
  71 /** Represents an SSL user's extra data
  72  */
  73 class issl_session
  74 {
  75 public:
  76         SSL* sess;
  77         issl_status status;
  78         reference<ssl_cert> cert;
  79
  80         bool outbound;
  81         bool data_to_write;
  82
  83         issl_session()
  84         {
  85                 outbound = false;
  86                 data_to_write = false;
  87         }
  88 };
  89
  90 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  91 {
  92         /* XXX: This will allow self signed certificates.
  93          * In the future if we want an option to not allow this,
  94          * we can just return preverify_ok here, and openssl
  95          * will boot off self-signed and invalid peer certs.
  96          */
  97         int ve = X509_STORE_CTX_get_error(ctx);
  98
  99         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 100
 101         return 1;
 102 }
 103
 104 class OpenSSLIOHook : public SSLIOHook
 105 {
 106  private:
 107         bool Handshake(StreamSocket* user, issl_session* session)
 108         {
 109                 int ret;
 110
 111                 if (session->outbound)
 112                         ret = SSL_connect(session->sess);
 113                 else
 114                         ret = SSL_accept(session->sess);
 115
 116                 if (ret < 0)
 117                 {
 118                         int err = SSL_get_error(session->sess, ret);
 119
 120                         if (err == SSL_ERROR_WANT_READ)
 121                         {
 122                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 123                                 session->status = ISSL_HANDSHAKING;
 124                                 return true;
 125                         }
 126                         else if (err == SSL_ERROR_WANT_WRITE)
 127                         {
 128                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 129                                 session->status = ISSL_HANDSHAKING;
 130                                 return true;
 131                         }
 132                         else
 133                         {
 134                                 CloseSession(session);
 135                         }
 136
 137                         return false;
 138                 }
 139                 else if (ret > 0)
 140                 {
 141                         // Handshake complete.
 142                         VerifyCertificate(session, user);
 143
 144                         session->status = ISSL_OPEN;
 145
 146                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 147
 148                         return true;
 149                 }
 150                 else if (ret == 0)
 151                 {
 152                         CloseSession(session);
 153                         return true;
 154                 }
 155
 156                 return true;
 157         }
 158
 159         void CloseSession(issl_session* session)
 160         {
 161                 if (session->sess)
 162                 {
 163                         SSL_shutdown(session->sess);
 164                         SSL_free(session->sess);
 165                 }
 166
 167                 session->sess = NULL;
 168                 session->status = ISSL_NONE;
 169                 errno = EIO;
 170         }
 171
 172         void VerifyCertificate(issl_session* session, StreamSocket* user)
 173         {
 174                 if (!session->sess || !user)
 175                         return;
 176
 177                 X509* cert;
 178                 ssl_cert* certinfo = new ssl_cert;
 179                 session->cert = certinfo;
 180                 unsigned int n;
 181                 unsigned char md[EVP_MAX_MD_SIZE];
 182                 const EVP_MD *digest = use_sha ? EVP_sha1() : EVP_md5();
 183
 184                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 185
 186                 if (!cert)
 187                 {
 188                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 189                         return;
 190                 }
 191
 192                 certinfo->invalid = (SSL_get_verify_result(session->sess) != X509_V_OK);
 193
 194                 if (SelfSigned)
 195                 {
 196                         certinfo->unknownsigner = false;
 197                         certinfo->trusted = true;
 198                 }
 199                 else
 200                 {
 201                         certinfo->unknownsigner = true;
 202                         certinfo->trusted = false;
 203                 }
 204
 205                 certinfo->dn = X509_NAME_oneline(X509_get_subject_name(cert),0,0);
 206                 certinfo->issuer = X509_NAME_oneline(X509_get_issuer_name(cert),0,0);
 207
 208                 if (!X509_digest(cert, digest, md, &n))
 209                 {
 210                         certinfo->error = "Out of memory generating fingerprint";
 211                 }
 212                 else
 213                 {
 214                         certinfo->fingerprint = BinToHex(md, n);
 215                 }
 216
 217                 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))
 218                 {
 219                         certinfo->error = "Not activated, or expired certificate";
 220                 }
 221
 222                 X509_free(cert);
 223         }
 224
 225  public:
 226         issl_session* sessions;
 227         SSL_CTX* ctx;
 228         SSL_CTX* clictx;
 229         bool use_sha;
 230
 231         OpenSSLIOHook(Module* mod)
 232                 : SSLIOHook(mod, "ssl/openssl")
 233         {
 234                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 235         }
 236
 237         ~OpenSSLIOHook()
 238         {
 239                 delete[] sessions;
 240         }
 241
 242         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
 243         {
 244                 int fd = user->GetFd();
 245
 246                 issl_session* session = &sessions[fd];
 247
 248                 session->sess = SSL_new(ctx);
 249                 session->status = ISSL_NONE;
 250                 session->outbound = false;
 251                 session->cert = NULL;
 252
 253                 if (session->sess == NULL)
 254                         return;
 255
 256                 if (SSL_set_fd(session->sess, fd) == 0)
 257                 {
 258                         ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEBUG, "BUG: Can't set fd with SSL_set_fd: %d", fd);
 259                         return;
 260                 }
 261
 262                 Handshake(user, session);
 263         }
 264
 265         void OnStreamSocketConnect(StreamSocket* user) CXX11_OVERRIDE
 266         {
 267                 int fd = user->GetFd();
 268                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 269                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 270                         return;
 271
 272                 issl_session* session = &sessions[fd];
 273
 274                 session->sess = SSL_new(clictx);
 275                 session->status = ISSL_NONE;
 276                 session->outbound = true;
 277
 278                 if (session->sess == NULL)
 279                         return;
 280
 281                 if (SSL_set_fd(session->sess, fd) == 0)
 282                 {
 283                         ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEBUG, "BUG: Can't set fd with SSL_set_fd: %d", fd);
 284                         return;
 285                 }
 286
 287                 Handshake(user, session);
 288         }
 289
 290         void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
 291         {
 292                 int fd = user->GetFd();
 293                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 294                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 295                         return;
 296
 297                 CloseSession(&sessions[fd]);
 298         }
 299
 300         int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
 301         {
 302                 int fd = user->GetFd();
 303                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 304                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 305                         return -1;
 306
 307                 issl_session* session = &sessions[fd];
 308
 309                 if (!session->sess)
 310                 {
 311                         CloseSession(session);
 312                         return -1;
 313                 }
 314
 315                 if (session->status == ISSL_HANDSHAKING)
 316                 {
 317                         // The handshake isn't finished and it wants to read, try to finish it.
 318                         if (!Handshake(user, session))
 319                         {
 320                                 // Couldn't resume handshake.
 321                                 if (session->status == ISSL_NONE)
 322                                         return -1;
 323                                 return 0;
 324                         }
 325                 }
 326
 327                 // If we resumed the handshake then session->status will be ISSL_OPEN
 328
 329                 if (session->status == ISSL_OPEN)
 330                 {
 331                         char* buffer = ServerInstance->GetReadBuffer();
 332                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 333                         int ret = SSL_read(session->sess, buffer, bufsiz);
 334
 335                         if (ret > 0)
 336                         {
 337                                 recvq.append(buffer, ret);
 338                                 if (session->data_to_write)
 339                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE);
 340                                 return 1;
 341                         }
 342                         else if (ret == 0)
 343                         {
 344                                 // Client closed connection.
 345                                 CloseSession(session);
 346                                 user->SetError("Connection closed");
 347                                 return -1;
 348                         }
 349                         else if (ret < 0)
 350                         {
 351                                 int err = SSL_get_error(session->sess, ret);
 352
 353                                 if (err == SSL_ERROR_WANT_READ)
 354                                 {
 355                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 356                                         return 0;
 357                                 }
 358                                 else if (err == SSL_ERROR_WANT_WRITE)
 359                                 {
 360                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 361                                         return 0;
 362                                 }
 363                                 else
 364                                 {
 365                                         CloseSession(session);
 366                                         return -1;
 367                                 }
 368                         }
 369                 }
 370
 371                 return 0;
 372         }
 373
 374         int OnStreamSocketWrite(StreamSocket* user, std::string& buffer) CXX11_OVERRIDE
 375         {
 376                 int fd = user->GetFd();
 377
 378                 issl_session* session = &sessions[fd];
 379
 380                 if (!session->sess)
 381                 {
 382                         CloseSession(session);
 383                         return -1;
 384                 }
 385
 386                 session->data_to_write = true;
 387
 388                 if (session->status == ISSL_HANDSHAKING)
 389                 {
 390                         if (!Handshake(user, session))
 391                         {
 392                                 // Couldn't resume handshake.
 393                                 if (session->status == ISSL_NONE)
 394                                         return -1;
 395                                 return 0;
 396                         }
 397                 }
 398
 399                 if (session->status == ISSL_OPEN)
 400                 {
 401                         int ret = SSL_write(session->sess, buffer.data(), buffer.size());
 402                         if (ret == (int)buffer.length())
 403                         {
 404                                 session->data_to_write = false;
 405                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 406                                 return 1;
 407                         }
 408                         else if (ret > 0)
 409                         {
 410                                 buffer = buffer.substr(ret);
 411                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 412                                 return 0;
 413                         }
 414                         else if (ret == 0)
 415                         {
 416                                 CloseSession(session);
 417                                 return -1;
 418                         }
 419                         else if (ret < 0)
 420                         {
 421                                 int err = SSL_get_error(session->sess, ret);
 422
 423                                 if (err == SSL_ERROR_WANT_WRITE)
 424                                 {
 425                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 426                                         return 0;
 427                                 }
 428                                 else if (err == SSL_ERROR_WANT_READ)
 429                                 {
 430                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 431                                         return 0;
 432                                 }
 433                                 else
 434                                 {
 435                                         CloseSession(session);
 436                                         return -1;
 437                                 }
 438                         }
 439                 }
 440                 return 0;
 441         }
 442
 443         ssl_cert* GetCertificate(StreamSocket* sock) CXX11_OVERRIDE
 444         {
 445                 int fd = sock->GetFd();
 446                 issl_session* session = &sessions[fd];
 447                 return session->cert;
 448         }
 449
 450         void TellCiphersAndFingerprint(LocalUser* user)
 451         {
 452                 issl_session& s = sessions[user->eh.GetFd()];
 453                 if (s.sess)
 454                 {
 455                         std::string text = "*** You are connected using SSL cipher '" + std::string(SSL_get_cipher(s.sess)) + "'";
 456                         const std::string& fingerprint = s.cert->fingerprint;
 457                         if (!fingerprint.empty())
 458                                 text += " and your SSL fingerprint is " + fingerprint;
 459
 460                         user->WriteNotice(text);
 461                 }
 462         }
 463 };
 464
 465 class ModuleSSLOpenSSL : public Module
 466 {
 467         std::string sslports;
 468         OpenSSLIOHook iohook;
 469
 470  public:
 471         ModuleSSLOpenSSL() : iohook(this)
 472         {
 473                 /* Global SSL library initialization*/
 474                 SSL_library_init();
 475                 SSL_load_error_strings();
 476
 477                 /* Build our SSL contexts:
 478                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 479                  */
 480                 iohook.ctx = SSL_CTX_new( SSLv23_server_method() );
 481                 iohook.clictx = SSL_CTX_new( SSLv23_client_method() );
 482
 483                 SSL_CTX_set_mode(iohook.ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 484                 SSL_CTX_set_mode(iohook.clictx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 485
 486                 SSL_CTX_set_verify(iohook.ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 487                 SSL_CTX_set_verify(iohook.clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 488         }
 489
 490         ~ModuleSSLOpenSSL()
 491         {
 492                 SSL_CTX_free(iohook.ctx);
 493                 SSL_CTX_free(iohook.clictx);
 494         }
 495
 496         void init() CXX11_OVERRIDE
 497         {
 498                 // Needs the flag as it ignores a plain /rehash
 499                 OnModuleRehash(NULL,"ssl");
 500                 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnHookIO, I_OnUserConnect };
 501                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 502                 ServerInstance->Modules->AddService(iohook);
 503         }
 504
 505         void OnHookIO(StreamSocket* user, ListenSocket* lsb) CXX11_OVERRIDE
 506         {
 507                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "openssl")
 508                 {
 509                         /* Hook the user with our module */
 510                         user->AddIOHook(&iohook);
 511                 }
 512         }
 513
 514         void OnRehash(User* user) CXX11_OVERRIDE
 515         {
 516                 sslports.clear();
 517
 518                 ConfigTag* Conf = ServerInstance->Config->ConfValue("openssl");
 519
 520                 if (Conf->getBool("showports", true))
 521                 {
 522                         sslports = Conf->getString("advertisedports");
 523                         if (!sslports.empty())
 524                                 return;
 525
 526                         for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 527                         {
 528                                 ListenSocket* port = ServerInstance->ports[i];
 529                                 if (port->bind_tag->getString("ssl") != "openssl")
 530                                         continue;
 531
 532                                 const std::string& portid = port->bind_desc;
 533                                 ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %s", portid.c_str());
 534
 535                                 if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 536                                 {
 537                                         /*
 538                                          * Found an SSL port for clients that is not bound to 127.0.0.1 and handled by us, display
 539                                          * the IP:port in ISUPPORT.
 540                                          *
 541                                          * We used to advertise all ports seperated by a ';' char that matched the above criteria,
 542                                          * but this resulted in too long ISUPPORT lines if there were lots of ports to be displayed.
 543                                          * To solve this by default we now only display the first IP:port found and let the user
 544                                          * configure the exact value for the 005 token, if necessary.
 545                                          */
 546                                         sslports = portid;
 547                                         break;
 548                                 }
 549                         }
 550                 }
 551         }
 552
 553         void OnModuleRehash(User* user, const std::string &param) CXX11_OVERRIDE
 554         {
 555                 if (param != "ssl")
 556                         return;
 557
 558                 std::string keyfile;
 559                 std::string certfile;
 560                 std::string cafile;
 561                 std::string dhfile;
 562                 OnRehash(user);
 563
 564                 ConfigTag* conf = ServerInstance->Config->ConfValue("openssl");
 565
 566                 cafile   = conf->getString("cafile", CONFIG_PATH "/ca.pem");
 567                 certfile = conf->getString("certfile", CONFIG_PATH "/cert.pem");
 568                 keyfile  = conf->getString("keyfile", CONFIG_PATH "/key.pem");
 569                 dhfile   = conf->getString("dhfile", CONFIG_PATH "/dhparams.pem");
 570                 std::string hash = conf->getString("hash", "md5");
 571                 if (hash != "sha1" && hash != "md5")
 572                         throw ModuleException("Unknown hash type " + hash);
 573                 iohook.use_sha = (hash == "sha1");
 574
 575                 std::string ciphers = conf->getString("ciphers", "");
 576
 577                 SSL_CTX* ctx = iohook.ctx;
 578                 SSL_CTX* clictx = iohook.clictx;
 579
 580                 if (!ciphers.empty())
 581                 {
 582                         if ((!SSL_CTX_set_cipher_list(ctx, ciphers.c_str())) || (!SSL_CTX_set_cipher_list(clictx, ciphers.c_str())))
 583                         {
 584                                 ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEFAULT, "m_ssl_openssl.so: Can't set cipher list to %s.", ciphers.c_str());
 585                                 ERR_print_errors_cb(error_callback, this);
 586                         }
 587                 }
 588
 589                 /* Load our keys and certificates
 590                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 591                  */
 592                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 593                 {
 594                         ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 595                         ERR_print_errors_cb(error_callback, this);
 596                 }
 597
 598                 if (((!SSL_CTX_use_PrivateKey_file(ctx, keyfile.c_str(), SSL_FILETYPE_PEM))) || (!SSL_CTX_use_PrivateKey_file(clictx, keyfile.c_str(), SSL_FILETYPE_PEM)))
 599                 {
 600                         ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 601                         ERR_print_errors_cb(error_callback, this);
 602                 }
 603
 604                 /* Load the CAs we trust*/
 605                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 606                 {
 607                         ServerInstance->Logs->Log("m_ssl_openssl",LOG_DEFAULT, "m_ssl_openssl.so: 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", cafile.c_str(), strerror(errno));
 608                         ERR_print_errors_cb(error_callback, this);
 609                 }
 610
 611                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 612                 DH* ret;
 613
 614                 if (dhpfile == NULL)
 615                 {
 616                         ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 617                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 618                 }
 619                 else
 620                 {
 621                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 622                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 623                         {
 624                                 ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 625                                 ERR_print_errors_cb(error_callback, this);
 626                         }
 627                 }
 628
 629                 fclose(dhpfile);
 630         }
 631
 632         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
 633         {
 634                 if (!sslports.empty())
 635                         tokens["SSL"] = sslports;
 636         }
 637
 638         void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
 639         {
 640                 if (user->eh.GetIOHook() == &iohook)
 641                         iohook.TellCiphersAndFingerprint(user);
 642         }
 643
 644         void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
 645         {
 646                 if (target_type == TYPE_USER)
 647                 {
 648                         LocalUser* user = IS_LOCAL((User*)item);
 649
 650                         if (user && user->eh.GetIOHook() == &iohook)
 651                         {
 652                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 653                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 654                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 655                         }
 656                 }
 657         }
 658
 659         Version GetVersion() CXX11_OVERRIDE
 660         {
 661                 return Version("Provides SSL support for clients", VF_VENDOR);
 662         }
 663 };
 664
 665 static int error_callback(const char *str, size_t len, void *u)
 666 {
 667         ServerInstance->Logs->Log("m_ssl_openssl", LOG_DEFAULT, "SSL error: " + std::string(str, len - 1));
 668
 669         //
 670         // XXX: Remove this line, it causes valgrind warnings...
 671         //
 672         // MD_update(&m, buf, j);
 673         //
 674         //
 675         // ... ONLY JOKING! :-)
 676         //
 677
 678         return 0;
 679 }
 680
 681 MODULE_INIT(ModuleSSLOpenSSL)