src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #include <openssl/ssl.h>
  17 #include <openssl/err.h>
  18
  19 #ifdef WINDOWS
  20 #include <openssl/applink.c>
  21 #endif
  22
  23 #include "configreader.h"
  24 #include "users.h"
  25 #include "channels.h"
  26 #include "modules.h"
  27
  28 #include "socket.h"
  29 #include "hashcomp.h"
  30
  31 #include "transport.h"
  32
  33 #ifdef WINDOWS
  34 #pragma comment(lib, "libeay32MTd")
  35 #pragma comment(lib, "ssleay32MTd")
  36 #undef MAX_DESCRIPTORS
  37 #define MAX_DESCRIPTORS 10000
  38 #endif
  39
  40 /* $ModDesc: Provides SSL support for clients */
  41 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  42 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  43 /* $ModDep: transport.h */
  44
  45 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  46 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  47
  48 static bool SelfSigned = false;
  49
  50 bool isin(int port, const std::vector<int> &portlist)
  51 {
  52         for(unsigned int i = 0; i < portlist.size(); i++)
  53                 if(portlist[i] == port)
  54                         return true;
  55
  56         return false;
  57 }
  58
  59 char* get_error()
  60 {
  61         return ERR_error_string(ERR_get_error(), NULL);
  62 }
  63
  64 static int error_callback(const char *str, size_t len, void *u);
  65
  66 /** Represents an SSL user's extra data
  67  */
  68 class issl_session : public classbase
  69 {
  70 public:
  71         SSL* sess;
  72         issl_status status;
  73         issl_io_status rstat;
  74         issl_io_status wstat;
  75
  76         unsigned int inbufoffset;
  77         char* inbuf;                    // Buffer OpenSSL reads into.
  78         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  79         int fd;
  80         bool outbound;
  81
  82         issl_session()
  83         {
  84                 outbound = false;
  85                 rstat = ISSL_READ;
  86                 wstat = ISSL_WRITE;
  87         }
  88 };
  89
  90 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  91 {
  92         /* XXX: This will allow self signed certificates.
  93          * In the future if we want an option to not allow this,
  94          * we can just return preverify_ok here, and openssl
  95          * will boot off self-signed and invalid peer certs.
  96          */
  97         int ve = X509_STORE_CTX_get_error(ctx);
  98
  99         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 100
 101         return 1;
 102 }
 103
 104 class ModuleSSLOpenSSL : public Module
 105 {
 106
 107         ConfigReader* Conf;
 108
 109         std::vector<int> listenports;
 110
 111         int inbufsize;
 112         issl_session sessions[MAX_DESCRIPTORS];
 113
 114         SSL_CTX* ctx;
 115         SSL_CTX* clictx;
 116
 117         char* dummy;
 118         char cipher[MAXBUF];
 119
 120         std::string keyfile;
 121         std::string certfile;
 122         std::string cafile;
 123         // std::string crlfile;
 124         std::string dhfile;
 125
 126         int clientactive;
 127
 128  public:
 129
 130         InspIRCd* PublicInstance;
 131
 132         ModuleSSLOpenSSL(InspIRCd* Me)
 133                 : Module(Me), PublicInstance(Me)
 134         {
 135                 ServerInstance->PublishInterface("InspSocketHook", this);
 136
 137                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 138                 inbufsize = ServerInstance->Config->NetBufferSize;
 139
 140                 /* Global SSL library initialization*/
 141                 SSL_library_init();
 142                 SSL_load_error_strings();
 143
 144                 /* Build our SSL contexts:
 145                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 146                  */
 147                 ctx = SSL_CTX_new( SSLv23_server_method() );
 148                 clictx = SSL_CTX_new( SSLv23_client_method() );
 149
 150                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 151                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 152
 153                 // Needs the flag as it ignores a plain /rehash
 154                 OnRehash(NULL,"ssl");
 155         }
 156
 157         virtual void OnRehash(userrec* user, const std::string &param)
 158         {
 159                 if (param != "ssl")
 160                         return;
 161
 162                 Conf = new ConfigReader(ServerInstance);
 163
 164                 for (unsigned int i = 0; i < listenports.size(); i++)
 165                 {
 166                         ServerInstance->Config->DelIOHook(listenports[i]);
 167                 }
 168
 169                 listenports.clear();
 170                 clientactive = 0;
 171
 172                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 173                 {
 174                         // For each <bind> tag
 175                         if (((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 176                         {
 177                                 // Get the port we're meant to be listening on with SSL
 178                                 std::string port = Conf->ReadValue("bind", "port", i);
 179                                 irc::portparser portrange(port, false);
 180                                 long portno = -1;
 181                                 while ((portno = portrange.GetToken()))
 182                                 {
 183                                         clientactive++;
 184                                         try
 185                                         {
 186                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 187                                                 {
 188                                                         listenports.push_back(portno);
 189                                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 190                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 191                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 192                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 193                                                 }
 194                                                 else
 195                                                 {
 196                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 197                                                 }
 198                                         }
 199                                         catch (ModuleException &e)
 200                                         {
 201                                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d: %s. Maybe it's already hooked by the same port on a different IP, or you have another SSL or similar module loaded?", portno, e.GetReason());
 202                                         }
 203                                 }
 204                         }
 205                 }
 206
 207                 std::string confdir(ServerInstance->ConfigFileName);
 208                 // +1 so we the path ends with a /
 209                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 210
 211                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 212                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 213                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 214                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 215
 216                 // Set all the default values needed.
 217                 if (cafile == "")
 218                         cafile = "ca.pem";
 219
 220                 if (certfile == "")
 221                         certfile = "cert.pem";
 222
 223                 if (keyfile == "")
 224                         keyfile = "key.pem";
 225
 226                 if (dhfile == "")
 227                         dhfile = "dhparams.pem";
 228
 229                 // Prepend relative paths with the path to the config directory.
 230                 if (cafile[0] != '/')
 231                         cafile = confdir + cafile;
 232
 233                 //if(crlfile[0] != '/')
 234                 //      crlfile = confdir + crlfile;
 235
 236                 if (certfile[0] != '/')
 237                         certfile = confdir + certfile;
 238
 239                 if (keyfile[0] != '/')
 240                         keyfile = confdir + keyfile;
 241
 242                 if (dhfile[0] != '/')
 243                         dhfile = confdir + dhfile;
 244
 245                 /* Load our keys and certificates
 246                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 247                  */
 248                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 249                 {
 250                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 251                         ERR_print_errors_cb(error_callback, this);
 252                 }
 253
 254                 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)))
 255                 {
 256                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 257                         ERR_print_errors_cb(error_callback, this);
 258                 }
 259
 260                 /* Load the CAs we trust*/
 261                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 262                 {
 263                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 264                         ERR_print_errors_cb(error_callback, this);
 265                 }
 266
 267                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 268                 DH* ret;
 269
 270                 if (dhpfile == NULL)
 271                 {
 272                         ServerInstance->Log(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                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 278                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 279                         {
 280                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 281                                 ERR_print_errors_cb(error_callback, this);
 282                         }
 283                 }
 284
 285                 fclose(dhpfile);
 286
 287                 DELETE(Conf);
 288         }
 289
 290         virtual ~ModuleSSLOpenSSL()
 291         {
 292                 SSL_CTX_free(ctx);
 293                 SSL_CTX_free(clictx);
 294         }
 295
 296         virtual void OnCleanup(int target_type, void* item)
 297         {
 298                 if (target_type == TYPE_USER)
 299                 {
 300                         userrec* user = (userrec*)item;
 301
 302                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 303                         {
 304                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 305                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 306                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 307                         }
 308                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 309                         {
 310                                 ssl_cert* tofree;
 311                                 user->GetExt("ssl_cert", tofree);
 312                                 delete tofree;
 313                                 user->Shrink("ssl_cert");
 314                         }
 315                 }
 316         }
 317
 318         virtual void OnUnloadModule(Module* mod, const std::string &name)
 319         {
 320                 if (mod == this)
 321                 {
 322                         for(unsigned int i = 0; i < listenports.size(); i++)
 323                         {
 324                                 ServerInstance->Config->DelIOHook(listenports[i]);
 325                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 326                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 327                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 328                         }
 329                 }
 330         }
 331
 332         virtual Version GetVersion()
 333         {
 334                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 335         }
 336
 337         void Implements(char* List)
 338         {
 339                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 340                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 341         }
 342
 343         virtual char* OnRequest(Request* request)
 344         {
 345                 ISHRequest* ISR = (ISHRequest*)request;
 346                 if (strcmp("IS_NAME", request->GetId()) == 0)
 347                 {
 348                         return "openssl";
 349                 }
 350                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 351                 {
 352                         char* ret = "OK";
 353                         try
 354                         {
 355                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 356                         }
 357                         catch (ModuleException &e)
 358                         {
 359                                 return NULL;
 360                         }
 361
 362                         return ret;
 363                 }
 364                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 365                 {
 366                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 367                 }
 368                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 369                 {
 370                         if (ISR->Sock->GetFd() < 0)
 371                                 return (char*)"OK";
 372
 373                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 374                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 375                 }
 376                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 377                 {
 378                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 379                         if (session->sess)
 380                         {
 381                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 382                                 return "OK";
 383                         }
 384                 }
 385                 return NULL;
 386         }
 387
 388
 389         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 390         {
 391                 issl_session* session = &sessions[fd];
 392
 393                 session->fd = fd;
 394                 session->inbuf = new char[inbufsize];
 395                 session->inbufoffset = 0;
 396                 session->sess = SSL_new(ctx);
 397                 session->status = ISSL_NONE;
 398                 session->outbound = false;
 399
 400                 if (session->sess == NULL)
 401                         return;
 402
 403                 if (SSL_set_fd(session->sess, fd) == 0)
 404                 {
 405                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 406                         return;
 407                 }
 408
 409                 Handshake(session);
 410         }
 411
 412         virtual void OnRawSocketConnect(int fd)
 413         {
 414                 issl_session* session = &sessions[fd];
 415
 416                 session->fd = fd;
 417                 session->inbuf = new char[inbufsize];
 418                 session->inbufoffset = 0;
 419                 session->sess = SSL_new(clictx);
 420                 session->status = ISSL_NONE;
 421                 session->outbound = true;
 422
 423                 if (session->sess == NULL)
 424                         return;
 425
 426                 if (SSL_set_fd(session->sess, fd) == 0)
 427                 {
 428                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 429                         return;
 430                 }
 431
 432                 Handshake(session);
 433         }
 434
 435         virtual void OnRawSocketClose(int fd)
 436         {
 437                 CloseSession(&sessions[fd]);
 438
 439                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 440
 441                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 442                 {
 443                         ssl_cert* tofree;
 444                         user->GetExt("ssl_cert", tofree);
 445                         delete tofree;
 446                         user->Shrink("ssl_cert");
 447                 }
 448         }
 449
 450         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 451         {
 452                 issl_session* session = &sessions[fd];
 453
 454                 if (!session->sess)
 455                 {
 456                         readresult = 0;
 457                         CloseSession(session);
 458                         return 1;
 459                 }
 460
 461                 if (session->status == ISSL_HANDSHAKING)
 462                 {
 463                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 464                         {
 465                                 // The handshake isn't finished and it wants to read, try to finish it.
 466                                 if (!Handshake(session))
 467                                 {
 468                                         // Couldn't resume handshake.
 469                                         return -1;
 470                                 }
 471                         }
 472                         else
 473                         {
 474                                 return -1;
 475                         }
 476                 }
 477
 478                 // If we resumed the handshake then session->status will be ISSL_OPEN
 479
 480                 if (session->status == ISSL_OPEN)
 481                 {
 482                         if (session->wstat == ISSL_READ)
 483                         {
 484                                 if(DoWrite(session) == 0)
 485                                         return 0;
 486                         }
 487
 488                         if (session->rstat == ISSL_READ)
 489                         {
 490                                 int ret = DoRead(session);
 491
 492                                 if (ret > 0)
 493                                 {
 494                                         if (count <= session->inbufoffset)
 495                                         {
 496                                                 memcpy(buffer, session->inbuf, count);
 497                                                 // Move the stuff left in inbuf to the beginning of it
 498                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 499                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 500                                                 session->inbufoffset -= count;
 501                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 502                                                 readresult = count;
 503                                         }
 504                                         else
 505                                         {
 506                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 507                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 508
 509                                                 readresult = session->inbufoffset;
 510                                                 // Zero the offset, as there's nothing there..
 511                                                 session->inbufoffset = 0;
 512                                         }
 513
 514                                         return 1;
 515                                 }
 516                                 else
 517                                 {
 518                                         return ret;
 519                                 }
 520                         }
 521                 }
 522
 523                 return -1;
 524         }
 525
 526         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 527         {
 528                 issl_session* session = &sessions[fd];
 529
 530                 if (!session->sess)
 531                 {
 532                         CloseSession(session);
 533                         return -1;
 534                 }
 535
 536                 session->outbuf.append(buffer, count);
 537
 538                 if (session->status == ISSL_HANDSHAKING)
 539                 {
 540                         // The handshake isn't finished, try to finish it.
 541                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 542                                 Handshake(session);
 543                 }
 544
 545                 if (session->status == ISSL_OPEN)
 546                 {
 547                         if (session->rstat == ISSL_WRITE)
 548                                 DoRead(session);
 549
 550                         if (session->wstat == ISSL_WRITE)
 551                                 return DoWrite(session);
 552                 }
 553
 554                 return 1;
 555         }
 556
 557         int DoWrite(issl_session* session)
 558         {
 559                 if (!session->outbuf.size())
 560                         return -1;
 561
 562                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 563
 564                 if (ret == 0)
 565                 {
 566                         CloseSession(session);
 567                         return 0;
 568                 }
 569                 else if (ret < 0)
 570                 {
 571                         int err = SSL_get_error(session->sess, ret);
 572
 573                         if (err == SSL_ERROR_WANT_WRITE)
 574                         {
 575                                 session->wstat = ISSL_WRITE;
 576                                 return -1;
 577                         }
 578                         else if (err == SSL_ERROR_WANT_READ)
 579                         {
 580                                 session->wstat = ISSL_READ;
 581                                 return -1;
 582                         }
 583                         else
 584                         {
 585                                 CloseSession(session);
 586                                 return 0;
 587                         }
 588                 }
 589                 else
 590                 {
 591                         session->outbuf = session->outbuf.substr(ret);
 592                         return ret;
 593                 }
 594         }
 595
 596         int DoRead(issl_session* session)
 597         {
 598                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 599                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 600
 601                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 602
 603                 if (ret == 0)
 604                 {
 605                         // Client closed connection.
 606                         CloseSession(session);
 607                         return 0;
 608                 }
 609                 else if (ret < 0)
 610                 {
 611                         int err = SSL_get_error(session->sess, ret);
 612
 613                         if (err == SSL_ERROR_WANT_READ)
 614                         {
 615                                 session->rstat = ISSL_READ;
 616                                 return -1;
 617                         }
 618                         else if (err == SSL_ERROR_WANT_WRITE)
 619                         {
 620                                 session->rstat = ISSL_WRITE;
 621                                 return -1;
 622                         }
 623                         else
 624                         {
 625                                 CloseSession(session);
 626                                 return 0;
 627                         }
 628                 }
 629                 else
 630                 {
 631                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 632                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 633                         // 'buffer' is 'count' long
 634
 635                         session->inbufoffset += ret;
 636
 637                         return ret;
 638                 }
 639         }
 640
 641         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 642         virtual void OnWhois(userrec* source, userrec* dest)
 643         {
 644                 if (!clientactive)
 645                         return;
 646
 647                 // Bugfix, only send this numeric for *our* SSL users
 648                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 649                 {
 650                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 651                 }
 652         }
 653
 654         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 655         {
 656                 // check if the linking module wants to know about OUR metadata
 657                 if (extname == "ssl")
 658                 {
 659                         // check if this user has an swhois field to send
 660                         if(user->GetExt(extname, dummy))
 661                         {
 662                                 // call this function in the linking module, let it format the data how it
 663                                 // sees fit, and send it on its way. We dont need or want to know how.
 664                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 665                         }
 666                 }
 667         }
 668
 669         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 670         {
 671                 // check if its our metadata key, and its associated with a user
 672                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 673                 {
 674                         userrec* dest = (userrec*)target;
 675                         // if they dont already have an ssl flag, accept the remote server's
 676                         if (!dest->GetExt(extname, dummy))
 677                         {
 678                                 dest->Extend(extname, "ON");
 679                         }
 680                 }
 681         }
 682
 683         bool Handshake(issl_session* session)
 684         {
 685                 int ret;
 686
 687                 if (session->outbound)
 688                         ret = SSL_connect(session->sess);
 689                 else
 690                         ret = SSL_accept(session->sess);
 691
 692                 if (ret < 0)
 693                 {
 694                         int err = SSL_get_error(session->sess, ret);
 695
 696                         if (err == SSL_ERROR_WANT_READ)
 697                         {
 698                                 session->rstat = ISSL_READ;
 699                                 session->status = ISSL_HANDSHAKING;
 700                         }
 701                         else if (err == SSL_ERROR_WANT_WRITE)
 702                         {
 703                                 session->wstat = ISSL_WRITE;
 704                                 session->status = ISSL_HANDSHAKING;
 705                                 MakePollWrite(session);
 706                         }
 707                         else
 708                         {
 709                                 CloseSession(session);
 710                         }
 711
 712                         return false;
 713                 }
 714                 else if (ret > 0)
 715                 {
 716                         // Handshake complete.
 717                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 718                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 719                         if (u)
 720                         {
 721                                 if (!u->GetExt("ssl", dummy))
 722                                         u->Extend("ssl", "ON");
 723                         }
 724
 725                         session->status = ISSL_OPEN;
 726
 727                         MakePollWrite(session);
 728
 729                         return true;
 730                 }
 731                 else if (ret == 0)
 732                 {
 733                         CloseSession(session);
 734                         return true;
 735                 }
 736
 737                 return true;
 738         }
 739
 740         virtual void OnPostConnect(userrec* user)
 741         {
 742                 // This occurs AFTER OnUserConnect so we can be sure the
 743                 // protocol module has propogated the NICK message.
 744                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 745                 {
 746                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 747                         std::deque<std::string>* metadata = new std::deque<std::string>;
 748                         metadata->push_back(user->nick);
 749                         metadata->push_back("ssl");             // The metadata id
 750                         metadata->push_back("ON");              // The value to send
 751                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 752                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 753                         DELETE(event);
 754                         DELETE(metadata);
 755
 756                         VerifyCertificate(&sessions[user->GetFd()], user);
 757                         if (sessions[user->GetFd()].sess)
 758                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 759                 }
 760         }
 761
 762         void MakePollWrite(issl_session* session)
 763         {
 764                 OnRawSocketWrite(session->fd, NULL, 0);
 765         }
 766
 767         void CloseSession(issl_session* session)
 768         {
 769                 if (session->sess)
 770                 {
 771                         SSL_shutdown(session->sess);
 772                         SSL_free(session->sess);
 773                 }
 774
 775                 if (session->inbuf)
 776                 {
 777                         delete[] session->inbuf;
 778                 }
 779
 780                 session->outbuf.clear();
 781                 session->inbuf = NULL;
 782                 session->sess = NULL;
 783                 session->status = ISSL_NONE;
 784         }
 785
 786         void VerifyCertificate(issl_session* session, Extensible* user)
 787         {
 788                 if (!session->sess || !user)
 789                         return;
 790
 791                 X509* cert;
 792                 ssl_cert* certinfo = new ssl_cert;
 793                 unsigned int n;
 794                 unsigned char md[EVP_MAX_MD_SIZE];
 795                 const EVP_MD *digest = EVP_md5();
 796
 797                 user->Extend("ssl_cert",certinfo);
 798
 799                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 800
 801                 if (!cert)
 802                 {
 803                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 804                         return;
 805                 }
 806
 807                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 808
 809                 if (SelfSigned)
 810                 {
 811                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 812                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 813                 }
 814                 else
 815                 {
 816                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 817                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 818                 }
 819
 820                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 821                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 822
 823                 if (!X509_digest(cert, digest, md, &n))
 824                 {
 825                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 826                 }
 827                 else
 828                 {
 829                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 830                 }
 831
 832                 if ((ASN1_UTCTIME_cmp_time_t(X509_get_notAfter(cert), time(NULL)) == -1) || (ASN1_UTCTIME_cmp_time_t(X509_get_notBefore(cert), time(NULL)) == 0))
 833                 {
 834                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 835                 }
 836
 837                 X509_free(cert);
 838         }
 839 };
 840
 841 static int error_callback(const char *str, size_t len, void *u)
 842 {
 843         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 844         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 845         return 0;
 846 }
 847
 848 class ModuleSSLOpenSSLFactory : public ModuleFactory
 849 {
 850  public:
 851         ModuleSSLOpenSSLFactory()
 852         {
 853         }
 854
 855         ~ModuleSSLOpenSSLFactory()
 856         {
 857         }
 858
 859         virtual Module * CreateModule(InspIRCd* Me)
 860         {
 861                 return new ModuleSSLOpenSSL(Me);
 862         }
 863 };
 864
 865
 866 extern "C" DllExport void * init_module( void )
 867 {
 868         return new ModuleSSLOpenSSLFactory;
 869 }