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 <openssl/ssl.h>
  35 #include <openssl/err.h>
  36 #include "ssl.h"
  37
  38 #ifdef _WIN32
  39 # pragma comment(lib, "ssleay32.lib")
  40 # pragma comment(lib, "libeay32.lib")
  41 # undef MAX_DESCRIPTORS
  42 # define MAX_DESCRIPTORS 10000
  43 #endif
  44
  45 /* $ModDesc: Provides SSL support for clients */
  46
  47 /* $LinkerFlags: if("USE_FREEBSD_BASE_SSL") -lssl -lcrypto */
  48 /* $CompileFlags: if(!"USE_FREEBSD_BASE_SSL") pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  49 /* $LinkerFlags: if(!"USE_FREEBSD_BASE_SSL") rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  50
  51 /* $NoPedantic */
  52
  53
  54 class ModuleSSLOpenSSL;
  55
  56 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  57
  58 static bool SelfSigned = false;
  59
  60 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
  61 static ModuleSSLOpenSSL* opensslmod = NULL;
  62 #endif
  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                 : sess(NULL)
  85                 , status(ISSL_NONE)
  86         {
  87                 outbound = false;
  88                 data_to_write = false;
  89         }
  90 };
  91
  92 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  93 {
  94         /* XXX: This will allow self signed certificates.
  95          * In the future if we want an option to not allow this,
  96          * we can just return preverify_ok here, and openssl
  97          * will boot off self-signed and invalid peer certs.
  98          */
  99         int ve = X509_STORE_CTX_get_error(ctx);
 100
 101         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 102
 103         return 1;
 104 }
 105
 106 class ModuleSSLOpenSSL : public Module
 107 {
 108         issl_session* sessions;
 109
 110         SSL_CTX* ctx;
 111         SSL_CTX* clictx;
 112
 113         long ctx_options;
 114         long clictx_options;
 115
 116         std::string sslports;
 117         bool use_sha;
 118
 119         ServiceProvider iohook;
 120
 121         static void SetContextOptions(SSL_CTX* ctx, long defoptions, const std::string& ctxname, ConfigTag* tag)
 122         {
 123                 long setoptions = tag->getInt(ctxname + "setoptions");
 124                 // User-friendly config options for setting context options
 125 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
 126                 if (tag->getBool("cipherserverpref"))
 127                         setoptions |= SSL_OP_CIPHER_SERVER_PREFERENCE;
 128 #endif
 129 #ifdef SSL_OP_NO_COMPRESSION
 130                 if (!tag->getBool("compression", true))
 131                         setoptions |= SSL_OP_NO_COMPRESSION;
 132 #endif
 133                 if (!tag->getBool("sslv3", true))
 134                         setoptions |= SSL_OP_NO_SSLv3;
 135                 if (!tag->getBool("tlsv1", true))
 136                         setoptions |= SSL_OP_NO_TLSv1;
 137
 138                 long clearoptions = tag->getInt(ctxname + "clearoptions");
 139                 ServerInstance->Logs->Log("m_ssl_openssl", DEBUG, "Setting OpenSSL %s context options, default: %ld set: %ld clear: %ld", ctxname.c_str(), defoptions, setoptions, clearoptions);
 140
 141                 // Clear everything
 142                 SSL_CTX_clear_options(ctx, SSL_CTX_get_options(ctx));
 143
 144                 // Set the default options and what is in the conf
 145                 SSL_CTX_set_options(ctx, defoptions | setoptions);
 146                 long final = SSL_CTX_clear_options(ctx, clearoptions);
 147                 ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "OpenSSL %s context options: %ld", ctxname.c_str(), final);
 148         }
 149
 150 #ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
 151         void SetupECDH(ConfigTag* tag)
 152         {
 153                 std::string curvename = tag->getString("ecdhcurve", "prime256v1");
 154                 if (curvename.empty())
 155                         return;
 156
 157                 int nid = OBJ_sn2nid(curvename.c_str());
 158                 if (nid == 0)
 159                 {
 160                         ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Unknown curve: \"%s\"", curvename.c_str());
 161                         return;
 162                 }
 163
 164                 EC_KEY* eckey = EC_KEY_new_by_curve_name(nid);
 165                 if (!eckey)
 166                 {
 167                         ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Unable to create EC key object");
 168                         return;
 169                 }
 170
 171                 ERR_clear_error();
 172                 if (SSL_CTX_set_tmp_ecdh(ctx, eckey) < 0)
 173                 {
 174                         ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Couldn't set ECDH parameters");
 175                         ERR_print_errors_cb(error_callback, this);
 176                 }
 177
 178                 EC_KEY_free(eckey);
 179         }
 180 #endif
 181
 182 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 183         static void SSLInfoCallback(const SSL* ssl, int where, int rc)
 184         {
 185                 int fd = SSL_get_fd(const_cast<SSL*>(ssl));
 186                 issl_session& session = opensslmod->sessions[fd];
 187
 188                 if ((where & SSL_CB_HANDSHAKE_START) && (session.status == ISSL_OPEN))
 189                 {
 190                         // The other side is trying to renegotiate, kill the connection and change status
 191                         // to ISSL_NONE so CheckRenego() closes the session
 192                         session.status = ISSL_NONE;
 193                         ServerInstance->SE->Shutdown(fd, 2);
 194                 }
 195         }
 196
 197         bool CheckRenego(StreamSocket* sock, issl_session* session)
 198         {
 199                 if (session->status != ISSL_NONE)
 200                         return true;
 201
 202                 ServerInstance->Logs->Log("m_ssl_openssl", DEBUG, "Session %p killed, attempted to renegotiate", (void*)session->sess);
 203                 CloseSession(session);
 204                 sock->SetError("Renegotiation is not allowed");
 205                 return false;
 206         }
 207 #endif
 208
 209  public:
 210
 211         ModuleSSLOpenSSL() : iohook(this, "ssl/openssl", SERVICE_IOHOOK)
 212         {
 213 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 214                 opensslmod = this;
 215 #endif
 216                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 217
 218                 /* Global SSL library initialization*/
 219                 SSL_library_init();
 220                 SSL_load_error_strings();
 221
 222                 /* Build our SSL contexts:
 223                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 224                  */
 225                 ctx = SSL_CTX_new( SSLv23_server_method() );
 226                 clictx = SSL_CTX_new( SSLv23_client_method() );
 227
 228                 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 229                 SSL_CTX_set_mode(clictx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 230
 231                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 232                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 233
 234                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
 235                 SSL_CTX_set_session_cache_mode(clictx, SSL_SESS_CACHE_OFF);
 236
 237                 long opts = SSL_OP_NO_SSLv2 | SSL_OP_SINGLE_DH_USE;
 238                 // Only turn options on if they exist
 239 #ifdef SSL_OP_SINGLE_ECDH_USE
 240                 opts |= SSL_OP_SINGLE_ECDH_USE;
 241 #endif
 242 #ifdef SSL_OP_NO_TICKET
 243                 opts |= SSL_OP_NO_TICKET;
 244 #endif
 245
 246                 ctx_options = SSL_CTX_set_options(ctx, opts);
 247                 clictx_options = SSL_CTX_set_options(clictx, opts);
 248         }
 249
 250         void init()
 251         {
 252                 // Needs the flag as it ignores a plain /rehash
 253                 OnModuleRehash(NULL,"ssl");
 254                 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnHookIO, I_OnUserConnect };
 255                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 256                 ServerInstance->Modules->AddService(iohook);
 257         }
 258
 259         void OnHookIO(StreamSocket* user, ListenSocket* lsb)
 260         {
 261                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "openssl")
 262                 {
 263                         /* Hook the user with our module */
 264                         user->AddIOHook(this);
 265                 }
 266         }
 267
 268         void OnRehash(User* user)
 269         {
 270                 sslports.clear();
 271
 272                 ConfigTag* Conf = ServerInstance->Config->ConfValue("openssl");
 273
 274 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 275                 // Set the callback if we are not allowing renegotiations, unset it if we do
 276                 if (Conf->getBool("renegotiation", true))
 277                 {
 278                         SSL_CTX_set_info_callback(ctx, NULL);
 279                         SSL_CTX_set_info_callback(clictx, NULL);
 280                 }
 281                 else
 282                 {
 283                         SSL_CTX_set_info_callback(ctx, SSLInfoCallback);
 284                         SSL_CTX_set_info_callback(clictx, SSLInfoCallback);
 285                 }
 286 #endif
 287
 288                 if (Conf->getBool("showports", true))
 289                 {
 290                         sslports = Conf->getString("advertisedports");
 291                         if (!sslports.empty())
 292                                 return;
 293
 294                         for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 295                         {
 296                                 ListenSocket* port = ServerInstance->ports[i];
 297                                 if (port->bind_tag->getString("ssl") != "openssl")
 298                                         continue;
 299
 300                                 const std::string& portid = port->bind_desc;
 301                                 ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %s", portid.c_str());
 302
 303                                 if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 304                                 {
 305                                         /*
 306                                          * Found an SSL port for clients that is not bound to 127.0.0.1 and handled by us, display
 307                                          * the IP:port in ISUPPORT.
 308                                          *
 309                                          * We used to advertise all ports seperated by a ';' char that matched the above criteria,
 310                                          * but this resulted in too long ISUPPORT lines if there were lots of ports to be displayed.
 311                                          * To solve this by default we now only display the first IP:port found and let the user
 312                                          * configure the exact value for the 005 token, if necessary.
 313                                          */
 314                                         sslports = portid;
 315                                         break;
 316                                 }
 317                         }
 318                 }
 319         }
 320
 321         void OnModuleRehash(User* user, const std::string &param)
 322         {
 323                 if (param != "ssl")
 324                         return;
 325
 326                 std::string keyfile;
 327                 std::string certfile;
 328                 std::string cafile;
 329                 std::string dhfile;
 330                 OnRehash(user);
 331
 332                 ConfigTag* conf = ServerInstance->Config->ConfValue("openssl");
 333
 334                 cafile   = conf->getString("cafile", CONFIG_PATH "/ca.pem");
 335                 certfile = conf->getString("certfile", CONFIG_PATH "/cert.pem");
 336                 keyfile  = conf->getString("keyfile", CONFIG_PATH "/key.pem");
 337                 dhfile   = conf->getString("dhfile", CONFIG_PATH "/dhparams.pem");
 338                 std::string hash = conf->getString("hash", "md5");
 339                 if (hash != "sha1" && hash != "md5")
 340                         throw ModuleException("Unknown hash type " + hash);
 341                 use_sha = (hash == "sha1");
 342
 343                 if (conf->getBool("customcontextoptions"))
 344                 {
 345                         SetContextOptions(ctx, ctx_options, "server", conf);
 346                         SetContextOptions(clictx, clictx_options, "client", conf);
 347                 }
 348
 349                 std::string ciphers = conf->getString("ciphers", "");
 350
 351                 if (!ciphers.empty())
 352                 {
 353                         ERR_clear_error();
 354                         if ((!SSL_CTX_set_cipher_list(ctx, ciphers.c_str())) || (!SSL_CTX_set_cipher_list(clictx, ciphers.c_str())))
 355                         {
 356                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't set cipher list to %s.", ciphers.c_str());
 357                                 ERR_print_errors_cb(error_callback, this);
 358                         }
 359                 }
 360
 361                 /* Load our keys and certificates
 362                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 363                  */
 364                 ERR_clear_error();
 365                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 366                 {
 367                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 368                         ERR_print_errors_cb(error_callback, this);
 369                 }
 370
 371                 ERR_clear_error();
 372                 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)))
 373                 {
 374                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 375                         ERR_print_errors_cb(error_callback, this);
 376                 }
 377
 378                 /* Load the CAs we trust*/
 379                 ERR_clear_error();
 380                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 381                 {
 382                         ServerInstance->Logs->Log("m_ssl_openssl",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));
 383                         ERR_print_errors_cb(error_callback, this);
 384                 }
 385
 386 #ifdef _WIN32
 387                 BIO* dhpfile = BIO_new_file(dhfile.c_str(), "r");
 388 #else
 389                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 390 #endif
 391                 DH* ret;
 392
 393                 if (dhpfile == NULL)
 394                 {
 395                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 396                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 397                 }
 398                 else
 399                 {
 400 #ifdef _WIN32
 401                         ret = PEM_read_bio_DHparams(dhpfile, NULL, NULL, NULL);
 402                         BIO_free(dhpfile);
 403 #else
 404                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 405 #endif
 406
 407                         ERR_clear_error();
 408                         if (ret)
 409                         {
 410                                 if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 411                                 {
 412                                         ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 413                                         ERR_print_errors_cb(error_callback, this);
 414                                 }
 415                                 DH_free(ret);
 416                         }
 417                         else
 418                         {
 419                                 ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s.", dhfile.c_str());
 420                         }
 421                 }
 422
 423 #ifndef _WIN32
 424                 fclose(dhpfile);
 425 #endif
 426
 427 #ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
 428                 SetupECDH(conf);
 429 #endif
 430         }
 431
 432         void On005Numeric(std::string &output)
 433         {
 434                 if (!sslports.empty())
 435                         output.append(" SSL=" + sslports);
 436         }
 437
 438         ~ModuleSSLOpenSSL()
 439         {
 440                 SSL_CTX_free(ctx);
 441                 SSL_CTX_free(clictx);
 442                 delete[] sessions;
 443         }
 444
 445         void OnUserConnect(LocalUser* user)
 446         {
 447                 if (user->eh.GetIOHook() == this)
 448                 {
 449                         if (sessions[user->eh.GetFd()].sess)
 450                         {
 451                                 if (!sessions[user->eh.GetFd()].cert->fingerprint.empty())
 452                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\""
 453                                                 " and your SSL fingerprint is %s", user->nick.c_str(), SSL_get_cipher(sessions[user->eh.GetFd()].sess), sessions[user->eh.GetFd()].cert->fingerprint.c_str());
 454                                 else
 455                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->eh.GetFd()].sess));
 456                         }
 457                 }
 458         }
 459
 460         void OnCleanup(int target_type, void* item)
 461         {
 462                 if (target_type == TYPE_USER)
 463                 {
 464                         LocalUser* user = IS_LOCAL((User*)item);
 465
 466                         if (user && user->eh.GetIOHook() == this)
 467                         {
 468                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 469                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 470                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 471                         }
 472                 }
 473         }
 474
 475         Version GetVersion()
 476         {
 477                 return Version("Provides SSL support for clients", VF_VENDOR);
 478         }
 479
 480         void OnRequest(Request& request)
 481         {
 482                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 483                 {
 484                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 485                         int fd = req.sock->GetFd();
 486                         issl_session* session = &sessions[fd];
 487
 488                         req.cert = session->cert;
 489                 }
 490                 else if (!strcmp("GET_RAW_SSL_SESSION", request.id))
 491                 {
 492                         SSLRawSessionRequest& req = static_cast<SSLRawSessionRequest&>(request);
 493                         if ((req.fd >= 0) && (req.fd < ServerInstance->SE->GetMaxFds()))
 494                                 req.data = reinterpret_cast<void*>(sessions[req.fd].sess);
 495                 }
 496         }
 497
 498         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 499         {
 500                 int fd = user->GetFd();
 501
 502                 issl_session* session = &sessions[fd];
 503
 504                 session->sess = SSL_new(ctx);
 505                 session->status = ISSL_NONE;
 506                 session->outbound = false;
 507                 session->data_to_write = false;
 508
 509                 if (session->sess == NULL)
 510                         return;
 511
 512                 if (SSL_set_fd(session->sess, fd) == 0)
 513                 {
 514                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 515                         return;
 516                 }
 517
 518                 Handshake(user, session);
 519         }
 520
 521         void OnStreamSocketConnect(StreamSocket* user)
 522         {
 523                 int fd = user->GetFd();
 524                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 525                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 526                         return;
 527
 528                 issl_session* session = &sessions[fd];
 529
 530                 session->sess = SSL_new(clictx);
 531                 session->status = ISSL_NONE;
 532                 session->outbound = true;
 533                 session->data_to_write = false;
 534
 535                 if (session->sess == NULL)
 536                         return;
 537
 538                 if (SSL_set_fd(session->sess, fd) == 0)
 539                 {
 540                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 541                         return;
 542                 }
 543
 544                 Handshake(user, session);
 545         }
 546
 547         void OnStreamSocketClose(StreamSocket* user)
 548         {
 549                 int fd = user->GetFd();
 550                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 551                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 552                         return;
 553
 554                 CloseSession(&sessions[fd]);
 555         }
 556
 557         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 558         {
 559                 int fd = user->GetFd();
 560                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 561                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 562                         return -1;
 563
 564                 issl_session* session = &sessions[fd];
 565
 566                 if (!session->sess)
 567                 {
 568                         CloseSession(session);
 569                         return -1;
 570                 }
 571
 572                 if (session->status == ISSL_HANDSHAKING)
 573                 {
 574                         // The handshake isn't finished and it wants to read, try to finish it.
 575                         if (!Handshake(user, session))
 576                         {
 577                                 // Couldn't resume handshake.
 578                                 if (session->status == ISSL_NONE)
 579                                         return -1;
 580                                 return 0;
 581                         }
 582                 }
 583
 584                 // If we resumed the handshake then session->status will be ISSL_OPEN
 585
 586                 if (session->status == ISSL_OPEN)
 587                 {
 588                         ERR_clear_error();
 589                         char* buffer = ServerInstance->GetReadBuffer();
 590                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 591                         int ret = SSL_read(session->sess, buffer, bufsiz);
 592
 593 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 594                         if (!CheckRenego(user, session))
 595                                 return -1;
 596 #endif
 597
 598                         if (ret > 0)
 599                         {
 600                                 recvq.append(buffer, ret);
 601
 602                                 int mask = 0;
 603                                 // Schedule a read if there is still data in the OpenSSL buffer
 604                                 if (SSL_pending(session->sess) > 0)
 605                                         mask |= FD_ADD_TRIAL_READ;
 606                                 if (session->data_to_write)
 607                                         mask |= FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE;
 608                                 if (mask != 0)
 609                                         ServerInstance->SE->ChangeEventMask(user, mask);
 610                                 return 1;
 611                         }
 612                         else if (ret == 0)
 613                         {
 614                                 // Client closed connection.
 615                                 CloseSession(session);
 616                                 user->SetError("Connection closed");
 617                                 return -1;
 618                         }
 619                         else if (ret < 0)
 620                         {
 621                                 int err = SSL_get_error(session->sess, ret);
 622
 623                                 if (err == SSL_ERROR_WANT_READ)
 624                                 {
 625                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 626                                         return 0;
 627                                 }
 628                                 else if (err == SSL_ERROR_WANT_WRITE)
 629                                 {
 630                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 631                                         return 0;
 632                                 }
 633                                 else
 634                                 {
 635                                         CloseSession(session);
 636                                         return -1;
 637                                 }
 638                         }
 639                 }
 640
 641                 return 0;
 642         }
 643
 644         int OnStreamSocketWrite(StreamSocket* user, std::string& buffer)
 645         {
 646                 int fd = user->GetFd();
 647
 648                 issl_session* session = &sessions[fd];
 649
 650                 if (!session->sess)
 651                 {
 652                         CloseSession(session);
 653                         return -1;
 654                 }
 655
 656                 session->data_to_write = true;
 657
 658                 if (session->status == ISSL_HANDSHAKING)
 659                 {
 660                         if (!Handshake(user, session))
 661                         {
 662                                 // Couldn't resume handshake.
 663                                 if (session->status == ISSL_NONE)
 664                                         return -1;
 665                                 return 0;
 666                         }
 667                 }
 668
 669                 if (session->status == ISSL_OPEN)
 670                 {
 671                         ERR_clear_error();
 672                         int ret = SSL_write(session->sess, buffer.data(), buffer.size());
 673
 674 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 675                         if (!CheckRenego(user, session))
 676                                 return -1;
 677 #endif
 678
 679                         if (ret == (int)buffer.length())
 680                         {
 681                                 session->data_to_write = false;
 682                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 683                                 return 1;
 684                         }
 685                         else if (ret > 0)
 686                         {
 687                                 buffer = buffer.substr(ret);
 688                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 689                                 return 0;
 690                         }
 691                         else if (ret == 0)
 692                         {
 693                                 CloseSession(session);
 694                                 return -1;
 695                         }
 696                         else if (ret < 0)
 697                         {
 698                                 int err = SSL_get_error(session->sess, ret);
 699
 700                                 if (err == SSL_ERROR_WANT_WRITE)
 701                                 {
 702                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 703                                         return 0;
 704                                 }
 705                                 else if (err == SSL_ERROR_WANT_READ)
 706                                 {
 707                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 708                                         return 0;
 709                                 }
 710                                 else
 711                                 {
 712                                         CloseSession(session);
 713                                         return -1;
 714                                 }
 715                         }
 716                 }
 717                 return 0;
 718         }
 719
 720         bool Handshake(StreamSocket* user, issl_session* session)
 721         {
 722                 int ret;
 723
 724                 ERR_clear_error();
 725                 if (session->outbound)
 726                         ret = SSL_connect(session->sess);
 727                 else
 728                         ret = SSL_accept(session->sess);
 729
 730                 if (ret < 0)
 731                 {
 732                         int err = SSL_get_error(session->sess, ret);
 733
 734                         if (err == SSL_ERROR_WANT_READ)
 735                         {
 736                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 737                                 session->status = ISSL_HANDSHAKING;
 738                                 return true;
 739                         }
 740                         else if (err == SSL_ERROR_WANT_WRITE)
 741                         {
 742                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 743                                 session->status = ISSL_HANDSHAKING;
 744                                 return true;
 745                         }
 746                         else
 747                         {
 748                                 CloseSession(session);
 749                         }
 750
 751                         return false;
 752                 }
 753                 else if (ret > 0)
 754                 {
 755                         // Handshake complete.
 756                         VerifyCertificate(session, user);
 757
 758                         session->status = ISSL_OPEN;
 759
 760                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 761
 762                         return true;
 763                 }
 764                 else if (ret == 0)
 765                 {
 766                         CloseSession(session);
 767                 }
 768                 return false;
 769         }
 770
 771         void CloseSession(issl_session* session)
 772         {
 773                 if (session->sess)
 774                 {
 775                         SSL_shutdown(session->sess);
 776                         SSL_free(session->sess);
 777                 }
 778
 779                 session->sess = NULL;
 780                 session->status = ISSL_NONE;
 781                 session->cert = NULL;
 782         }
 783
 784         void VerifyCertificate(issl_session* session, StreamSocket* user)
 785         {
 786                 if (!session->sess || !user)
 787                         return;
 788
 789                 X509* cert;
 790                 ssl_cert* certinfo = new ssl_cert;
 791                 session->cert = certinfo;
 792                 unsigned int n;
 793                 unsigned char md[EVP_MAX_MD_SIZE];
 794                 const EVP_MD *digest = use_sha ? EVP_sha1() : EVP_md5();
 795
 796                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 797
 798                 if (!cert)
 799                 {
 800                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 801                         return;
 802                 }
 803
 804                 certinfo->invalid = (SSL_get_verify_result(session->sess) != X509_V_OK);
 805
 806                 if (!SelfSigned)
 807                 {
 808                         certinfo->unknownsigner = false;
 809                         certinfo->trusted = true;
 810                 }
 811                 else
 812                 {
 813                         certinfo->unknownsigner = true;
 814                         certinfo->trusted = false;
 815                 }
 816
 817                 char buf[512];
 818                 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf));
 819                 certinfo->dn = buf;
 820                 // Make sure there are no chars in the string that we consider invalid
 821                 if (certinfo->dn.find_first_of("\r\n") != std::string::npos)
 822                         certinfo->dn.clear();
 823
 824                 X509_NAME_oneline(X509_get_issuer_name(cert), buf, sizeof(buf));
 825                 certinfo->issuer = buf;
 826                 if (certinfo->issuer.find_first_of("\r\n") != std::string::npos)
 827                         certinfo->issuer.clear();
 828
 829                 if (!X509_digest(cert, digest, md, &n))
 830                 {
 831                         certinfo->error = "Out of memory generating fingerprint";
 832                 }
 833                 else
 834                 {
 835                         certinfo->fingerprint = irc::hex(md, n);
 836                 }
 837
 838                 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))
 839                 {
 840                         certinfo->error = "Not activated, or expired certificate";
 841                 }
 842
 843                 X509_free(cert);
 844         }
 845 };
 846
 847 static int error_callback(const char *str, size_t len, void *u)
 848 {
 849         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 850
 851         //
 852         // XXX: Remove this line, it causes valgrind warnings...
 853         //
 854         // MD_update(&m, buf, j);
 855         //
 856         //
 857         // ... ONLY JOKING! :-)
 858         //
 859
 860         return 0;
 861 }
 862
 863 MODULE_INIT(ModuleSSLOpenSSL)