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 ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 409                         {
 410                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 411                                 ERR_print_errors_cb(error_callback, this);
 412                         }
 413                         DH_free(ret);
 414                 }
 415
 416 #ifndef _WIN32
 417                 fclose(dhpfile);
 418 #endif
 419
 420 #ifdef INSPIRCD_OPENSSL_ENABLE_ECDH
 421                 SetupECDH(conf);
 422 #endif
 423         }
 424
 425         void On005Numeric(std::string &output)
 426         {
 427                 if (!sslports.empty())
 428                         output.append(" SSL=" + sslports);
 429         }
 430
 431         ~ModuleSSLOpenSSL()
 432         {
 433                 SSL_CTX_free(ctx);
 434                 SSL_CTX_free(clictx);
 435                 delete[] sessions;
 436         }
 437
 438         void OnUserConnect(LocalUser* user)
 439         {
 440                 if (user->eh.GetIOHook() == this)
 441                 {
 442                         if (sessions[user->eh.GetFd()].sess)
 443                         {
 444                                 if (!sessions[user->eh.GetFd()].cert->fingerprint.empty())
 445                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\""
 446                                                 " 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());
 447                                 else
 448                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->eh.GetFd()].sess));
 449                         }
 450                 }
 451         }
 452
 453         void OnCleanup(int target_type, void* item)
 454         {
 455                 if (target_type == TYPE_USER)
 456                 {
 457                         LocalUser* user = IS_LOCAL((User*)item);
 458
 459                         if (user && user->eh.GetIOHook() == this)
 460                         {
 461                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 462                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 463                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 464                         }
 465                 }
 466         }
 467
 468         Version GetVersion()
 469         {
 470                 return Version("Provides SSL support for clients", VF_VENDOR);
 471         }
 472
 473         void OnRequest(Request& request)
 474         {
 475                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 476                 {
 477                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 478                         int fd = req.sock->GetFd();
 479                         issl_session* session = &sessions[fd];
 480
 481                         req.cert = session->cert;
 482                 }
 483                 else if (!strcmp("GET_RAW_SSL_SESSION", request.id))
 484                 {
 485                         SSLRawSessionRequest& req = static_cast<SSLRawSessionRequest&>(request);
 486                         if ((req.fd >= 0) && (req.fd < ServerInstance->SE->GetMaxFds()))
 487                                 req.data = reinterpret_cast<void*>(sessions[req.fd].sess);
 488                 }
 489         }
 490
 491         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 492         {
 493                 int fd = user->GetFd();
 494
 495                 issl_session* session = &sessions[fd];
 496
 497                 session->sess = SSL_new(ctx);
 498                 session->status = ISSL_NONE;
 499                 session->outbound = false;
 500                 session->data_to_write = false;
 501
 502                 if (session->sess == NULL)
 503                         return;
 504
 505                 if (SSL_set_fd(session->sess, fd) == 0)
 506                 {
 507                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 508                         return;
 509                 }
 510
 511                 Handshake(user, session);
 512         }
 513
 514         void OnStreamSocketConnect(StreamSocket* user)
 515         {
 516                 int fd = user->GetFd();
 517                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 518                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 519                         return;
 520
 521                 issl_session* session = &sessions[fd];
 522
 523                 session->sess = SSL_new(clictx);
 524                 session->status = ISSL_NONE;
 525                 session->outbound = true;
 526                 session->data_to_write = false;
 527
 528                 if (session->sess == NULL)
 529                         return;
 530
 531                 if (SSL_set_fd(session->sess, fd) == 0)
 532                 {
 533                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 534                         return;
 535                 }
 536
 537                 Handshake(user, session);
 538         }
 539
 540         void OnStreamSocketClose(StreamSocket* user)
 541         {
 542                 int fd = user->GetFd();
 543                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 544                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 545                         return;
 546
 547                 CloseSession(&sessions[fd]);
 548         }
 549
 550         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 551         {
 552                 int fd = user->GetFd();
 553                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 554                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 555                         return -1;
 556
 557                 issl_session* session = &sessions[fd];
 558
 559                 if (!session->sess)
 560                 {
 561                         CloseSession(session);
 562                         return -1;
 563                 }
 564
 565                 if (session->status == ISSL_HANDSHAKING)
 566                 {
 567                         // The handshake isn't finished and it wants to read, try to finish it.
 568                         if (!Handshake(user, session))
 569                         {
 570                                 // Couldn't resume handshake.
 571                                 if (session->status == ISSL_NONE)
 572                                         return -1;
 573                                 return 0;
 574                         }
 575                 }
 576
 577                 // If we resumed the handshake then session->status will be ISSL_OPEN
 578
 579                 if (session->status == ISSL_OPEN)
 580                 {
 581                         ERR_clear_error();
 582                         char* buffer = ServerInstance->GetReadBuffer();
 583                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 584                         int ret = SSL_read(session->sess, buffer, bufsiz);
 585
 586 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 587                         if (!CheckRenego(user, session))
 588                                 return -1;
 589 #endif
 590
 591                         if (ret > 0)
 592                         {
 593                                 recvq.append(buffer, ret);
 594
 595                                 int mask = 0;
 596                                 // Schedule a read if there is still data in the OpenSSL buffer
 597                                 if (SSL_pending(session->sess) > 0)
 598                                         mask |= FD_ADD_TRIAL_READ;
 599                                 if (session->data_to_write)
 600                                         mask |= FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE;
 601                                 if (mask != 0)
 602                                         ServerInstance->SE->ChangeEventMask(user, mask);
 603                                 return 1;
 604                         }
 605                         else if (ret == 0)
 606                         {
 607                                 // Client closed connection.
 608                                 CloseSession(session);
 609                                 user->SetError("Connection closed");
 610                                 return -1;
 611                         }
 612                         else if (ret < 0)
 613                         {
 614                                 int err = SSL_get_error(session->sess, ret);
 615
 616                                 if (err == SSL_ERROR_WANT_READ)
 617                                 {
 618                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 619                                         return 0;
 620                                 }
 621                                 else if (err == SSL_ERROR_WANT_WRITE)
 622                                 {
 623                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 624                                         return 0;
 625                                 }
 626                                 else
 627                                 {
 628                                         CloseSession(session);
 629                                         return -1;
 630                                 }
 631                         }
 632                 }
 633
 634                 return 0;
 635         }
 636
 637         int OnStreamSocketWrite(StreamSocket* user, std::string& buffer)
 638         {
 639                 int fd = user->GetFd();
 640
 641                 issl_session* session = &sessions[fd];
 642
 643                 if (!session->sess)
 644                 {
 645                         CloseSession(session);
 646                         return -1;
 647                 }
 648
 649                 session->data_to_write = true;
 650
 651                 if (session->status == ISSL_HANDSHAKING)
 652                 {
 653                         if (!Handshake(user, session))
 654                         {
 655                                 // Couldn't resume handshake.
 656                                 if (session->status == ISSL_NONE)
 657                                         return -1;
 658                                 return 0;
 659                         }
 660                 }
 661
 662                 if (session->status == ISSL_OPEN)
 663                 {
 664                         ERR_clear_error();
 665                         int ret = SSL_write(session->sess, buffer.data(), buffer.size());
 666
 667 #ifdef INSPIRCD_OPENSSL_ENABLE_RENEGO_DETECTION
 668                         if (!CheckRenego(user, session))
 669                                 return -1;
 670 #endif
 671
 672                         if (ret == (int)buffer.length())
 673                         {
 674                                 session->data_to_write = false;
 675                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 676                                 return 1;
 677                         }
 678                         else if (ret > 0)
 679                         {
 680                                 buffer = buffer.substr(ret);
 681                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 682                                 return 0;
 683                         }
 684                         else if (ret == 0)
 685                         {
 686                                 CloseSession(session);
 687                                 return -1;
 688                         }
 689                         else if (ret < 0)
 690                         {
 691                                 int err = SSL_get_error(session->sess, ret);
 692
 693                                 if (err == SSL_ERROR_WANT_WRITE)
 694                                 {
 695                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 696                                         return 0;
 697                                 }
 698                                 else if (err == SSL_ERROR_WANT_READ)
 699                                 {
 700                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 701                                         return 0;
 702                                 }
 703                                 else
 704                                 {
 705                                         CloseSession(session);
 706                                         return -1;
 707                                 }
 708                         }
 709                 }
 710                 return 0;
 711         }
 712
 713         bool Handshake(StreamSocket* user, issl_session* session)
 714         {
 715                 int ret;
 716
 717                 ERR_clear_error();
 718                 if (session->outbound)
 719                         ret = SSL_connect(session->sess);
 720                 else
 721                         ret = SSL_accept(session->sess);
 722
 723                 if (ret < 0)
 724                 {
 725                         int err = SSL_get_error(session->sess, ret);
 726
 727                         if (err == SSL_ERROR_WANT_READ)
 728                         {
 729                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 730                                 session->status = ISSL_HANDSHAKING;
 731                                 return true;
 732                         }
 733                         else if (err == SSL_ERROR_WANT_WRITE)
 734                         {
 735                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 736                                 session->status = ISSL_HANDSHAKING;
 737                                 return true;
 738                         }
 739                         else
 740                         {
 741                                 CloseSession(session);
 742                         }
 743
 744                         return false;
 745                 }
 746                 else if (ret > 0)
 747                 {
 748                         // Handshake complete.
 749                         VerifyCertificate(session, user);
 750
 751                         session->status = ISSL_OPEN;
 752
 753                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 754
 755                         return true;
 756                 }
 757                 else if (ret == 0)
 758                 {
 759                         CloseSession(session);
 760                 }
 761                 return false;
 762         }
 763
 764         void CloseSession(issl_session* session)
 765         {
 766                 if (session->sess)
 767                 {
 768                         SSL_shutdown(session->sess);
 769                         SSL_free(session->sess);
 770                 }
 771
 772                 session->sess = NULL;
 773                 session->status = ISSL_NONE;
 774                 session->cert = NULL;
 775         }
 776
 777         void VerifyCertificate(issl_session* session, StreamSocket* user)
 778         {
 779                 if (!session->sess || !user)
 780                         return;
 781
 782                 X509* cert;
 783                 ssl_cert* certinfo = new ssl_cert;
 784                 session->cert = certinfo;
 785                 unsigned int n;
 786                 unsigned char md[EVP_MAX_MD_SIZE];
 787                 const EVP_MD *digest = use_sha ? EVP_sha1() : EVP_md5();
 788
 789                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 790
 791                 if (!cert)
 792                 {
 793                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 794                         return;
 795                 }
 796
 797                 certinfo->invalid = (SSL_get_verify_result(session->sess) != X509_V_OK);
 798
 799                 if (!SelfSigned)
 800                 {
 801                         certinfo->unknownsigner = false;
 802                         certinfo->trusted = true;
 803                 }
 804                 else
 805                 {
 806                         certinfo->unknownsigner = true;
 807                         certinfo->trusted = false;
 808                 }
 809
 810                 char buf[512];
 811                 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf));
 812                 certinfo->dn = buf;
 813                 // Make sure there are no chars in the string that we consider invalid
 814                 if (certinfo->dn.find_first_of("\r\n") != std::string::npos)
 815                         certinfo->dn.clear();
 816
 817                 X509_NAME_oneline(X509_get_issuer_name(cert), buf, sizeof(buf));
 818                 certinfo->issuer = buf;
 819                 if (certinfo->issuer.find_first_of("\r\n") != std::string::npos)
 820                         certinfo->issuer.clear();
 821
 822                 if (!X509_digest(cert, digest, md, &n))
 823                 {
 824                         certinfo->error = "Out of memory generating fingerprint";
 825                 }
 826                 else
 827                 {
 828                         certinfo->fingerprint = irc::hex(md, n);
 829                 }
 830
 831                 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))
 832                 {
 833                         certinfo->error = "Not activated, or expired certificate";
 834                 }
 835
 836                 X509_free(cert);
 837         }
 838 };
 839
 840 static int error_callback(const char *str, size_t len, void *u)
 841 {
 842         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 843
 844         //
 845         // XXX: Remove this line, it causes valgrind warnings...
 846         //
 847         // MD_update(&m, buf, j);
 848         //
 849         //
 850         // ... ONLY JOKING! :-)
 851         //
 852
 853         return 0;
 854 }
 855
 856 MODULE_INIT(ModuleSSLOpenSSL)