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 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  55
  56 static bool SelfSigned = false;
  57
  58 char* get_error()
  59 {
  60         return ERR_error_string(ERR_get_error(), NULL);
  61 }
  62
  63 static int error_callback(const char *str, size_t len, void *u);
  64
  65 /** Represents an SSL user's extra data
  66  */
  67 class issl_session
  68 {
  69 public:
  70         SSL* sess;
  71         issl_status status;
  72         reference<ssl_cert> cert;
  73
  74         bool outbound;
  75         bool data_to_write;
  76
  77         issl_session()
  78         {
  79                 outbound = false;
  80                 data_to_write = false;
  81         }
  82 };
  83
  84 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  85 {
  86         /* XXX: This will allow self signed certificates.
  87          * In the future if we want an option to not allow this,
  88          * we can just return preverify_ok here, and openssl
  89          * will boot off self-signed and invalid peer certs.
  90          */
  91         int ve = X509_STORE_CTX_get_error(ctx);
  92
  93         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
  94
  95         return 1;
  96 }
  97
  98 class ModuleSSLOpenSSL : public Module
  99 {
 100         issl_session* sessions;
 101
 102         SSL_CTX* ctx;
 103         SSL_CTX* clictx;
 104
 105         std::string sslports;
 106         bool use_sha;
 107
 108         ServiceProvider iohook;
 109  public:
 110
 111         ModuleSSLOpenSSL() : iohook(this, "ssl/openssl", SERVICE_IOHOOK)
 112         {
 113                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 114
 115                 /* Global SSL library initialization*/
 116                 SSL_library_init();
 117                 SSL_load_error_strings();
 118
 119                 /* Build our SSL contexts:
 120                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 121                  */
 122                 ctx = SSL_CTX_new( SSLv23_server_method() );
 123                 clictx = SSL_CTX_new( SSLv23_client_method() );
 124
 125                 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 126                 SSL_CTX_set_mode(clictx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 127
 128                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 129                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 130
 131                 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
 132                 SSL_CTX_set_session_cache_mode(clictx, SSL_SESS_CACHE_OFF);
 133
 134                 long opts = SSL_OP_NO_SSLv2 | SSL_OP_SINGLE_DH_USE;
 135                 // Only turn options on if they exist
 136 #ifdef SSL_OP_SINGLE_ECDH_USE
 137                 opts |= SSL_OP_SINGLE_ECDH_USE;
 138 #endif
 139 #ifdef SSL_OP_NO_TICKET
 140                 opts |= SSL_OP_NO_TICKET;
 141 #endif
 142
 143                 SSL_CTX_set_options(ctx, opts);
 144                 SSL_CTX_set_options(clictx, opts);
 145         }
 146
 147         void init()
 148         {
 149                 // Needs the flag as it ignores a plain /rehash
 150                 OnModuleRehash(NULL,"ssl");
 151                 Implementation eventlist[] = { I_On005Numeric, I_OnRehash, I_OnModuleRehash, I_OnHookIO, I_OnUserConnect };
 152                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 153                 ServerInstance->Modules->AddService(iohook);
 154         }
 155
 156         void OnHookIO(StreamSocket* user, ListenSocket* lsb)
 157         {
 158                 if (!user->GetIOHook() && lsb->bind_tag->getString("ssl") == "openssl")
 159                 {
 160                         /* Hook the user with our module */
 161                         user->AddIOHook(this);
 162                 }
 163         }
 164
 165         void OnRehash(User* user)
 166         {
 167                 sslports.clear();
 168
 169                 ConfigTag* Conf = ServerInstance->Config->ConfValue("openssl");
 170
 171                 if (Conf->getBool("showports", true))
 172                 {
 173                         sslports = Conf->getString("advertisedports");
 174                         if (!sslports.empty())
 175                                 return;
 176
 177                         for (size_t i = 0; i < ServerInstance->ports.size(); i++)
 178                         {
 179                                 ListenSocket* port = ServerInstance->ports[i];
 180                                 if (port->bind_tag->getString("ssl") != "openssl")
 181                                         continue;
 182
 183                                 const std::string& portid = port->bind_desc;
 184                                 ServerInstance->Logs->Log("m_ssl_openssl", DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %s", portid.c_str());
 185
 186                                 if (port->bind_tag->getString("type", "clients") == "clients" && port->bind_addr != "127.0.0.1")
 187                                 {
 188                                         /*
 189                                          * Found an SSL port for clients that is not bound to 127.0.0.1 and handled by us, display
 190                                          * the IP:port in ISUPPORT.
 191                                          *
 192                                          * We used to advertise all ports seperated by a ';' char that matched the above criteria,
 193                                          * but this resulted in too long ISUPPORT lines if there were lots of ports to be displayed.
 194                                          * To solve this by default we now only display the first IP:port found and let the user
 195                                          * configure the exact value for the 005 token, if necessary.
 196                                          */
 197                                         sslports = portid;
 198                                         break;
 199                                 }
 200                         }
 201                 }
 202         }
 203
 204         void OnModuleRehash(User* user, const std::string &param)
 205         {
 206                 if (param != "ssl")
 207                         return;
 208
 209                 std::string keyfile;
 210                 std::string certfile;
 211                 std::string cafile;
 212                 std::string dhfile;
 213                 OnRehash(user);
 214
 215                 ConfigTag* conf = ServerInstance->Config->ConfValue("openssl");
 216
 217                 cafile   = conf->getString("cafile", CONFIG_PATH "/ca.pem");
 218                 certfile = conf->getString("certfile", CONFIG_PATH "/cert.pem");
 219                 keyfile  = conf->getString("keyfile", CONFIG_PATH "/key.pem");
 220                 dhfile   = conf->getString("dhfile", CONFIG_PATH "/dhparams.pem");
 221                 std::string hash = conf->getString("hash", "md5");
 222                 if (hash != "sha1" && hash != "md5")
 223                         throw ModuleException("Unknown hash type " + hash);
 224                 use_sha = (hash == "sha1");
 225
 226                 std::string ciphers = conf->getString("ciphers", "");
 227
 228                 if (!ciphers.empty())
 229                 {
 230                         ERR_clear_error();
 231                         if ((!SSL_CTX_set_cipher_list(ctx, ciphers.c_str())) || (!SSL_CTX_set_cipher_list(clictx, ciphers.c_str())))
 232                         {
 233                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't set cipher list to %s.", ciphers.c_str());
 234                                 ERR_print_errors_cb(error_callback, this);
 235                         }
 236                 }
 237
 238                 /* Load our keys and certificates
 239                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 240                  */
 241                 ERR_clear_error();
 242                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 243                 {
 244                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 245                         ERR_print_errors_cb(error_callback, this);
 246                 }
 247
 248                 ERR_clear_error();
 249                 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)))
 250                 {
 251                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 252                         ERR_print_errors_cb(error_callback, this);
 253                 }
 254
 255                 /* Load the CAs we trust*/
 256                 ERR_clear_error();
 257                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 258                 {
 259                         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));
 260                         ERR_print_errors_cb(error_callback, this);
 261                 }
 262
 263 #ifdef _WIN32
 264                 BIO* dhpfile = BIO_new_file(dhfile.c_str(), "r");
 265 #else
 266                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 267 #endif
 268                 DH* ret;
 269
 270                 if (dhpfile == NULL)
 271                 {
 272                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 273                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 274                 }
 275                 else
 276                 {
 277 #ifdef _WIN32
 278                         ret = PEM_read_bio_DHparams(dhpfile, NULL, NULL, NULL);
 279                         BIO_free(dhpfile);
 280 #else
 281                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 282 #endif
 283
 284                         ERR_clear_error();
 285                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 286                         {
 287                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 288                                 ERR_print_errors_cb(error_callback, this);
 289                         }
 290                         DH_free(ret);
 291                 }
 292
 293 #ifndef _WIN32
 294                 fclose(dhpfile);
 295 #endif
 296         }
 297
 298         void On005Numeric(std::string &output)
 299         {
 300                 if (!sslports.empty())
 301                         output.append(" SSL=" + sslports);
 302         }
 303
 304         ~ModuleSSLOpenSSL()
 305         {
 306                 SSL_CTX_free(ctx);
 307                 SSL_CTX_free(clictx);
 308                 delete[] sessions;
 309         }
 310
 311         void OnUserConnect(LocalUser* user)
 312         {
 313                 if (user->eh.GetIOHook() == this)
 314                 {
 315                         if (sessions[user->eh.GetFd()].sess)
 316                         {
 317                                 if (!sessions[user->eh.GetFd()].cert->fingerprint.empty())
 318                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\""
 319                                                 " 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());
 320                                 else
 321                                         user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick.c_str(), SSL_get_cipher(sessions[user->eh.GetFd()].sess));
 322                         }
 323                 }
 324         }
 325
 326         void OnCleanup(int target_type, void* item)
 327         {
 328                 if (target_type == TYPE_USER)
 329                 {
 330                         LocalUser* user = IS_LOCAL((User*)item);
 331
 332                         if (user && user->eh.GetIOHook() == this)
 333                         {
 334                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 335                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 336                                 ServerInstance->Users->QuitUser(user, "SSL module unloading");
 337                         }
 338                 }
 339         }
 340
 341         Version GetVersion()
 342         {
 343                 return Version("Provides SSL support for clients", VF_VENDOR);
 344         }
 345
 346         void OnRequest(Request& request)
 347         {
 348                 if (strcmp("GET_SSL_CERT", request.id) == 0)
 349                 {
 350                         SocketCertificateRequest& req = static_cast<SocketCertificateRequest&>(request);
 351                         int fd = req.sock->GetFd();
 352                         issl_session* session = &sessions[fd];
 353
 354                         req.cert = session->cert;
 355                 }
 356         }
 357
 358         void OnStreamSocketAccept(StreamSocket* user, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 359         {
 360                 int fd = user->GetFd();
 361
 362                 issl_session* session = &sessions[fd];
 363
 364                 session->sess = SSL_new(ctx);
 365                 session->status = ISSL_NONE;
 366                 session->outbound = false;
 367                 session->cert = NULL;
 368
 369                 if (session->sess == NULL)
 370                         return;
 371
 372                 if (SSL_set_fd(session->sess, fd) == 0)
 373                 {
 374                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 375                         return;
 376                 }
 377
 378                 Handshake(user, session);
 379         }
 380
 381         void OnStreamSocketConnect(StreamSocket* user)
 382         {
 383                 int fd = user->GetFd();
 384                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 385                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 386                         return;
 387
 388                 issl_session* session = &sessions[fd];
 389
 390                 session->sess = SSL_new(clictx);
 391                 session->status = ISSL_NONE;
 392                 session->outbound = true;
 393
 394                 if (session->sess == NULL)
 395                         return;
 396
 397                 if (SSL_set_fd(session->sess, fd) == 0)
 398                 {
 399                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 400                         return;
 401                 }
 402
 403                 Handshake(user, session);
 404         }
 405
 406         void OnStreamSocketClose(StreamSocket* user)
 407         {
 408                 int fd = user->GetFd();
 409                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 410                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 411                         return;
 412
 413                 CloseSession(&sessions[fd]);
 414         }
 415
 416         int OnStreamSocketRead(StreamSocket* user, std::string& recvq)
 417         {
 418                 int fd = user->GetFd();
 419                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 420                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 421                         return -1;
 422
 423                 issl_session* session = &sessions[fd];
 424
 425                 if (!session->sess)
 426                 {
 427                         CloseSession(session);
 428                         return -1;
 429                 }
 430
 431                 if (session->status == ISSL_HANDSHAKING)
 432                 {
 433                         // The handshake isn't finished and it wants to read, try to finish it.
 434                         if (!Handshake(user, session))
 435                         {
 436                                 // Couldn't resume handshake.
 437                                 if (session->status == ISSL_NONE)
 438                                         return -1;
 439                                 return 0;
 440                         }
 441                 }
 442
 443                 // If we resumed the handshake then session->status will be ISSL_OPEN
 444
 445                 if (session->status == ISSL_OPEN)
 446                 {
 447                         ERR_clear_error();
 448                         char* buffer = ServerInstance->GetReadBuffer();
 449                         size_t bufsiz = ServerInstance->Config->NetBufferSize;
 450                         int ret = SSL_read(session->sess, buffer, bufsiz);
 451
 452                         if (ret > 0)
 453                         {
 454                                 recvq.append(buffer, ret);
 455                                 if (session->data_to_write)
 456                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE);
 457                                 return 1;
 458                         }
 459                         else if (ret == 0)
 460                         {
 461                                 // Client closed connection.
 462                                 CloseSession(session);
 463                                 user->SetError("Connection closed");
 464                                 return -1;
 465                         }
 466                         else if (ret < 0)
 467                         {
 468                                 int err = SSL_get_error(session->sess, ret);
 469
 470                                 if (err == SSL_ERROR_WANT_READ)
 471                                 {
 472                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 473                                         return 0;
 474                                 }
 475                                 else if (err == SSL_ERROR_WANT_WRITE)
 476                                 {
 477                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 478                                         return 0;
 479                                 }
 480                                 else
 481                                 {
 482                                         CloseSession(session);
 483                                         return -1;
 484                                 }
 485                         }
 486                 }
 487
 488                 return 0;
 489         }
 490
 491         int OnStreamSocketWrite(StreamSocket* user, std::string& buffer)
 492         {
 493                 int fd = user->GetFd();
 494
 495                 issl_session* session = &sessions[fd];
 496
 497                 if (!session->sess)
 498                 {
 499                         CloseSession(session);
 500                         return -1;
 501                 }
 502
 503                 session->data_to_write = true;
 504
 505                 if (session->status == ISSL_HANDSHAKING)
 506                 {
 507                         if (!Handshake(user, session))
 508                         {
 509                                 // Couldn't resume handshake.
 510                                 if (session->status == ISSL_NONE)
 511                                         return -1;
 512                                 return 0;
 513                         }
 514                 }
 515
 516                 if (session->status == ISSL_OPEN)
 517                 {
 518                         ERR_clear_error();
 519                         int ret = SSL_write(session->sess, buffer.data(), buffer.size());
 520                         if (ret == (int)buffer.length())
 521                         {
 522                                 session->data_to_write = false;
 523                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 524                                 return 1;
 525                         }
 526                         else if (ret > 0)
 527                         {
 528                                 buffer = buffer.substr(ret);
 529                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 530                                 return 0;
 531                         }
 532                         else if (ret == 0)
 533                         {
 534                                 CloseSession(session);
 535                                 return -1;
 536                         }
 537                         else if (ret < 0)
 538                         {
 539                                 int err = SSL_get_error(session->sess, ret);
 540
 541                                 if (err == SSL_ERROR_WANT_WRITE)
 542                                 {
 543                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
 544                                         return 0;
 545                                 }
 546                                 else if (err == SSL_ERROR_WANT_READ)
 547                                 {
 548                                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ);
 549                                         return 0;
 550                                 }
 551                                 else
 552                                 {
 553                                         CloseSession(session);
 554                                         return -1;
 555                                 }
 556                         }
 557                 }
 558                 return 0;
 559         }
 560
 561         bool Handshake(StreamSocket* user, issl_session* session)
 562         {
 563                 int ret;
 564
 565                 ERR_clear_error();
 566                 if (session->outbound)
 567                         ret = SSL_connect(session->sess);
 568                 else
 569                         ret = SSL_accept(session->sess);
 570
 571                 if (ret < 0)
 572                 {
 573                         int err = SSL_get_error(session->sess, ret);
 574
 575                         if (err == SSL_ERROR_WANT_READ)
 576                         {
 577                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
 578                                 session->status = ISSL_HANDSHAKING;
 579                                 return true;
 580                         }
 581                         else if (err == SSL_ERROR_WANT_WRITE)
 582                         {
 583                                 ServerInstance->SE->ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
 584                                 session->status = ISSL_HANDSHAKING;
 585                                 return true;
 586                         }
 587                         else
 588                         {
 589                                 CloseSession(session);
 590                         }
 591
 592                         return false;
 593                 }
 594                 else if (ret > 0)
 595                 {
 596                         // Handshake complete.
 597                         VerifyCertificate(session, user);
 598
 599                         session->status = ISSL_OPEN;
 600
 601                         ServerInstance->SE->ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
 602
 603                         return true;
 604                 }
 605                 else if (ret == 0)
 606                 {
 607                         CloseSession(session);
 608                         return true;
 609                 }
 610
 611                 return true;
 612         }
 613
 614         void CloseSession(issl_session* session)
 615         {
 616                 if (session->sess)
 617                 {
 618                         SSL_shutdown(session->sess);
 619                         SSL_free(session->sess);
 620                 }
 621
 622                 session->sess = NULL;
 623                 session->status = ISSL_NONE;
 624                 errno = EIO;
 625         }
 626
 627         void VerifyCertificate(issl_session* session, StreamSocket* user)
 628         {
 629                 if (!session->sess || !user)
 630                         return;
 631
 632                 X509* cert;
 633                 ssl_cert* certinfo = new ssl_cert;
 634                 session->cert = certinfo;
 635                 unsigned int n;
 636                 unsigned char md[EVP_MAX_MD_SIZE];
 637                 const EVP_MD *digest = use_sha ? EVP_sha1() : EVP_md5();
 638
 639                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 640
 641                 if (!cert)
 642                 {
 643                         certinfo->error = "Could not get peer certificate: "+std::string(get_error());
 644                         return;
 645                 }
 646
 647                 certinfo->invalid = (SSL_get_verify_result(session->sess) != X509_V_OK);
 648
 649                 if (!SelfSigned)
 650                 {
 651                         certinfo->unknownsigner = false;
 652                         certinfo->trusted = true;
 653                 }
 654                 else
 655                 {
 656                         certinfo->unknownsigner = true;
 657                         certinfo->trusted = false;
 658                 }
 659
 660                 char buf[512];
 661                 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf));
 662                 certinfo->dn = buf;
 663                 // Make sure there are no chars in the string that we consider invalid
 664                 if (certinfo->dn.find_first_of("\r\n") != std::string::npos)
 665                         certinfo->dn.clear();
 666
 667                 X509_NAME_oneline(X509_get_issuer_name(cert), buf, sizeof(buf));
 668                 certinfo->issuer = buf;
 669                 if (certinfo->issuer.find_first_of("\r\n") != std::string::npos)
 670                         certinfo->issuer.clear();
 671
 672                 if (!X509_digest(cert, digest, md, &n))
 673                 {
 674                         certinfo->error = "Out of memory generating fingerprint";
 675                 }
 676                 else
 677                 {
 678                         certinfo->fingerprint = irc::hex(md, n);
 679                 }
 680
 681                 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))
 682                 {
 683                         certinfo->error = "Not activated, or expired certificate";
 684                 }
 685
 686                 X509_free(cert);
 687         }
 688 };
 689
 690 static int error_callback(const char *str, size_t len, void *u)
 691 {
 692         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 693
 694         //
 695         // XXX: Remove this line, it causes valgrind warnings...
 696         //
 697         // MD_update(&m, buf, j);
 698         //
 699         //
 700         // ... ONLY JOKING! :-)
 701         //
 702
 703         return 0;
 704 }
 705
 706 MODULE_INIT(ModuleSSLOpenSSL)