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 <string>
  15 #include <vector>
  16
  17 #include <openssl/ssl.h>
  18 #include <openssl/err.h>
  19
  20 #ifdef WINDOWS
  21 #include <openssl/applink.c>
  22 #endif
  23
  24 #include "inspircd_config.h"
  25 #include "configreader.h"
  26 #include "users.h"
  27 #include "channels.h"
  28 #include "modules.h"
  29
  30 #include "socket.h"
  31 #include "hashcomp.h"
  32 #include "inspircd.h"
  33
  34 #include "transport.h"
  35
  36 #ifdef WINDOWS
  37 #pragma comment(lib, "libeay32MTd")
  38 #pragma comment(lib, "ssleay32MTd")
  39 #undef MAX_DESCRIPTORS
  40 #define MAX_DESCRIPTORS 10000
  41 #endif
  42
  43 /* $ModDesc: Provides SSL support for clients */
  44 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  45 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  46 /* $ModDep: transport.h */
  47
  48 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  49 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  50
  51 static bool SelfSigned = false;
  52
  53 bool isin(int port, const std::vector<int> &portlist)
  54 {
  55         for(unsigned int i = 0; i < portlist.size(); i++)
  56                 if(portlist[i] == port)
  57                         return true;
  58
  59         return false;
  60 }
  61
  62 char* get_error()
  63 {
  64         return ERR_error_string(ERR_get_error(), NULL);
  65 }
  66
  67 static int error_callback(const char *str, size_t len, void *u);
  68
  69 /** Represents an SSL user's extra data
  70  */
  71 class issl_session : public classbase
  72 {
  73 public:
  74         SSL* sess;
  75         issl_status status;
  76         issl_io_status rstat;
  77         issl_io_status wstat;
  78
  79         unsigned int inbufoffset;
  80         char* inbuf;                    // Buffer OpenSSL reads into.
  81         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  82         int fd;
  83         bool outbound;
  84
  85         issl_session()
  86         {
  87                 outbound = false;
  88                 rstat = ISSL_READ;
  89                 wstat = ISSL_WRITE;
  90         }
  91 };
  92
  93 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  94 {
  95         /* XXX: This will allow self signed certificates.
  96          * In the future if we want an option to not allow this,
  97          * we can just return preverify_ok here, and openssl
  98          * will boot off self-signed and invalid peer certs.
  99          */
 100         int ve = X509_STORE_CTX_get_error(ctx);
 101
 102         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 103
 104         return 1;
 105 }
 106
 107 class ModuleSSLOpenSSL : public Module
 108 {
 109
 110         ConfigReader* Conf;
 111
 112         std::vector<int> listenports;
 113
 114         int inbufsize;
 115         issl_session sessions[MAX_DESCRIPTORS];
 116
 117         SSL_CTX* ctx;
 118         SSL_CTX* clictx;
 119
 120         char* dummy;
 121         char cipher[MAXBUF];
 122
 123         std::string keyfile;
 124         std::string certfile;
 125         std::string cafile;
 126         // std::string crlfile;
 127         std::string dhfile;
 128
 129         int clientactive;
 130
 131  public:
 132
 133         InspIRCd* PublicInstance;
 134
 135         ModuleSSLOpenSSL(InspIRCd* Me)
 136                 : Module(Me), PublicInstance(Me)
 137         {
 138                 ServerInstance->PublishInterface("InspSocketHook", this);
 139
 140                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 141                 inbufsize = ServerInstance->Config->NetBufferSize;
 142
 143                 /* Global SSL library initialization*/
 144                 SSL_library_init();
 145                 SSL_load_error_strings();
 146
 147                 /* Build our SSL contexts:
 148                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 149                  */
 150                 ctx = SSL_CTX_new( SSLv23_server_method() );
 151                 clictx = SSL_CTX_new( SSLv23_client_method() );
 152
 153                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 154                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 155
 156                 // Needs the flag as it ignores a plain /rehash
 157                 OnRehash(NULL,"ssl");
 158         }
 159
 160         virtual void OnRehash(userrec* user, const std::string &param)
 161         {
 162                 if (param != "ssl")
 163                         return;
 164
 165                 Conf = new ConfigReader(ServerInstance);
 166
 167                 for (unsigned int i = 0; i < listenports.size(); i++)
 168                 {
 169                         ServerInstance->Config->DelIOHook(listenports[i]);
 170                 }
 171
 172                 listenports.clear();
 173                 clientactive = 0;
 174
 175                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 176                 {
 177                         // For each <bind> tag
 178                         if (((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 179                         {
 180                                 // Get the port we're meant to be listening on with SSL
 181                                 std::string port = Conf->ReadValue("bind", "port", i);
 182                                 irc::portparser portrange(port, false);
 183                                 long portno = -1;
 184                                 while ((portno = portrange.GetToken()))
 185                                 {
 186                                         clientactive++;
 187                                         try
 188                                         {
 189                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 190                                                 {
 191                                                         listenports.push_back(portno);
 192                                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 193                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 194                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 195                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 196                                                 }
 197                                                 else
 198                                                 {
 199                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 200                                                 }
 201                                         }
 202                                         catch (ModuleException &e)
 203                                         {
 204                                                 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());
 205                                         }
 206                                 }
 207                         }
 208                 }
 209
 210                 std::string confdir(ServerInstance->ConfigFileName);
 211                 // +1 so we the path ends with a /
 212                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 213
 214                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 215                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 216                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 217                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 218
 219                 // Set all the default values needed.
 220                 if (cafile == "")
 221                         cafile = "ca.pem";
 222
 223                 if (certfile == "")
 224                         certfile = "cert.pem";
 225
 226                 if (keyfile == "")
 227                         keyfile = "key.pem";
 228
 229                 if (dhfile == "")
 230                         dhfile = "dhparams.pem";
 231
 232                 // Prepend relative paths with the path to the config directory.
 233                 if (cafile[0] != '/')
 234                         cafile = confdir + cafile;
 235
 236                 //if(crlfile[0] != '/')
 237                 //      crlfile = confdir + crlfile;
 238
 239                 if (certfile[0] != '/')
 240                         certfile = confdir + certfile;
 241
 242                 if (keyfile[0] != '/')
 243                         keyfile = confdir + keyfile;
 244
 245                 if (dhfile[0] != '/')
 246                         dhfile = confdir + dhfile;
 247
 248                 /* Load our keys and certificates
 249                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 250                  */
 251                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 252                 {
 253                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 254                         ERR_print_errors_cb(error_callback, this);
 255                 }
 256
 257                 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)))
 258                 {
 259                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 260                         ERR_print_errors_cb(error_callback, this);
 261                 }
 262
 263                 /* Load the CAs we trust*/
 264                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 265                 {
 266                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 267                         ERR_print_errors_cb(error_callback, this);
 268                 }
 269
 270                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 271                 DH* ret;
 272
 273                 if (dhpfile == NULL)
 274                 {
 275                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 276                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 277                 }
 278                 else
 279                 {
 280                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 281                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 282                         {
 283                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 284                                 ERR_print_errors_cb(error_callback, this);
 285                         }
 286                 }
 287
 288                 fclose(dhpfile);
 289
 290                 DELETE(Conf);
 291         }
 292
 293         virtual ~ModuleSSLOpenSSL()
 294         {
 295                 SSL_CTX_free(ctx);
 296                 SSL_CTX_free(clictx);
 297         }
 298
 299         virtual void OnCleanup(int target_type, void* item)
 300         {
 301                 if (target_type == TYPE_USER)
 302                 {
 303                         userrec* user = (userrec*)item;
 304
 305                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 306                         {
 307                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 308                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 309                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 310                         }
 311                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 312                         {
 313                                 ssl_cert* tofree;
 314                                 user->GetExt("ssl_cert", tofree);
 315                                 delete tofree;
 316                                 user->Shrink("ssl_cert");
 317                         }
 318                 }
 319         }
 320
 321         virtual void OnUnloadModule(Module* mod, const std::string &name)
 322         {
 323                 if (mod == this)
 324                 {
 325                         for(unsigned int i = 0; i < listenports.size(); i++)
 326                         {
 327                                 ServerInstance->Config->DelIOHook(listenports[i]);
 328                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 329                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 330                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 331                         }
 332                 }
 333         }
 334
 335         virtual Version GetVersion()
 336         {
 337                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 338         }
 339
 340         void Implements(char* List)
 341         {
 342                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 343                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 344         }
 345
 346         virtual char* OnRequest(Request* request)
 347         {
 348                 ISHRequest* ISR = (ISHRequest*)request;
 349                 if (strcmp("IS_NAME", request->GetId()) == 0)
 350                 {
 351                         return "openssl";
 352                 }
 353                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 354                 {
 355                         char* ret = "OK";
 356                         try
 357                         {
 358                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 359                         }
 360                         catch (ModuleException &e)
 361                         {
 362                                 return NULL;
 363                         }
 364
 365                         return ret;
 366                 }
 367                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 368                 {
 369                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 370                 }
 371                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 372                 {
 373                         if (ISR->Sock->GetFd() < 0)
 374                                 return (char*)"OK";
 375
 376                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 377                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 378                 }
 379                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 380                 {
 381                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 382                         if (session->sess)
 383                         {
 384                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 385                                 return "OK";
 386                         }
 387                 }
 388                 return NULL;
 389         }
 390
 391
 392         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 393         {
 394                 issl_session* session = &sessions[fd];
 395
 396                 session->fd = fd;
 397                 session->inbuf = new char[inbufsize];
 398                 session->inbufoffset = 0;
 399                 session->sess = SSL_new(ctx);
 400                 session->status = ISSL_NONE;
 401                 session->outbound = false;
 402
 403                 if (session->sess == NULL)
 404                         return;
 405
 406                 if (SSL_set_fd(session->sess, fd) == 0)
 407                 {
 408                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 409                         return;
 410                 }
 411
 412                 Handshake(session);
 413         }
 414
 415         virtual void OnRawSocketConnect(int fd)
 416         {
 417                 issl_session* session = &sessions[fd];
 418
 419                 session->fd = fd;
 420                 session->inbuf = new char[inbufsize];
 421                 session->inbufoffset = 0;
 422                 session->sess = SSL_new(clictx);
 423                 session->status = ISSL_NONE;
 424                 session->outbound = true;
 425
 426                 if (session->sess == NULL)
 427                         return;
 428
 429                 if (SSL_set_fd(session->sess, fd) == 0)
 430                 {
 431                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 432                         return;
 433                 }
 434
 435                 Handshake(session);
 436         }
 437
 438         virtual void OnRawSocketClose(int fd)
 439         {
 440                 CloseSession(&sessions[fd]);
 441
 442                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 443
 444                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 445                 {
 446                         ssl_cert* tofree;
 447                         user->GetExt("ssl_cert", tofree);
 448                         delete tofree;
 449                         user->Shrink("ssl_cert");
 450                 }
 451         }
 452
 453         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 454         {
 455                 issl_session* session = &sessions[fd];
 456
 457                 if (!session->sess)
 458                 {
 459                         readresult = 0;
 460                         CloseSession(session);
 461                         return 1;
 462                 }
 463
 464                 if (session->status == ISSL_HANDSHAKING)
 465                 {
 466                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 467                         {
 468                                 // The handshake isn't finished and it wants to read, try to finish it.
 469                                 if (!Handshake(session))
 470                                 {
 471                                         // Couldn't resume handshake.
 472                                         return -1;
 473                                 }
 474                         }
 475                         else
 476                         {
 477                                 return -1;
 478                         }
 479                 }
 480
 481                 // If we resumed the handshake then session->status will be ISSL_OPEN
 482
 483                 if (session->status == ISSL_OPEN)
 484                 {
 485                         if (session->wstat == ISSL_READ)
 486                         {
 487                                 if(DoWrite(session) == 0)
 488                                         return 0;
 489                         }
 490
 491                         if (session->rstat == ISSL_READ)
 492                         {
 493                                 int ret = DoRead(session);
 494
 495                                 if (ret > 0)
 496                                 {
 497                                         if (count <= session->inbufoffset)
 498                                         {
 499                                                 memcpy(buffer, session->inbuf, count);
 500                                                 // Move the stuff left in inbuf to the beginning of it
 501                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 502                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 503                                                 session->inbufoffset -= count;
 504                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 505                                                 readresult = count;
 506                                         }
 507                                         else
 508                                         {
 509                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 510                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 511
 512                                                 readresult = session->inbufoffset;
 513                                                 // Zero the offset, as there's nothing there..
 514                                                 session->inbufoffset = 0;
 515                                         }
 516
 517                                         return 1;
 518                                 }
 519                                 else
 520                                 {
 521                                         return ret;
 522                                 }
 523                         }
 524                 }
 525
 526                 return -1;
 527         }
 528
 529         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 530         {
 531                 issl_session* session = &sessions[fd];
 532
 533                 if (!session->sess)
 534                 {
 535                         CloseSession(session);
 536                         return -1;
 537                 }
 538
 539                 session->outbuf.append(buffer, count);
 540
 541                 if (session->status == ISSL_HANDSHAKING)
 542                 {
 543                         // The handshake isn't finished, try to finish it.
 544                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 545                                 Handshake(session);
 546                 }
 547
 548                 if (session->status == ISSL_OPEN)
 549                 {
 550                         if (session->rstat == ISSL_WRITE)
 551                                 DoRead(session);
 552
 553                         if (session->wstat == ISSL_WRITE)
 554                                 return DoWrite(session);
 555                 }
 556
 557                 return 1;
 558         }
 559
 560         int DoWrite(issl_session* session)
 561         {
 562                 if (!session->outbuf.size())
 563                         return -1;
 564
 565                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 566
 567                 if (ret == 0)
 568                 {
 569                         CloseSession(session);
 570                         return 0;
 571                 }
 572                 else if (ret < 0)
 573                 {
 574                         int err = SSL_get_error(session->sess, ret);
 575
 576                         if (err == SSL_ERROR_WANT_WRITE)
 577                         {
 578                                 session->wstat = ISSL_WRITE;
 579                                 return -1;
 580                         }
 581                         else if (err == SSL_ERROR_WANT_READ)
 582                         {
 583                                 session->wstat = ISSL_READ;
 584                                 return -1;
 585                         }
 586                         else
 587                         {
 588                                 CloseSession(session);
 589                                 return 0;
 590                         }
 591                 }
 592                 else
 593                 {
 594                         session->outbuf = session->outbuf.substr(ret);
 595                         return ret;
 596                 }
 597         }
 598
 599         int DoRead(issl_session* session)
 600         {
 601                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 602                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 603
 604                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 605
 606                 if (ret == 0)
 607                 {
 608                         // Client closed connection.
 609                         CloseSession(session);
 610                         return 0;
 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                                 session->rstat = ISSL_READ;
 619                                 return -1;
 620                         }
 621                         else if (err == SSL_ERROR_WANT_WRITE)
 622                         {
 623                                 session->rstat = ISSL_WRITE;
 624                                 return -1;
 625                         }
 626                         else
 627                         {
 628                                 CloseSession(session);
 629                                 return 0;
 630                         }
 631                 }
 632                 else
 633                 {
 634                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 635                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 636                         // 'buffer' is 'count' long
 637
 638                         session->inbufoffset += ret;
 639
 640                         return ret;
 641                 }
 642         }
 643
 644         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 645         virtual void OnWhois(userrec* source, userrec* dest)
 646         {
 647                 if (!clientactive)
 648                         return;
 649
 650                 // Bugfix, only send this numeric for *our* SSL users
 651                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 652                 {
 653                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 654                 }
 655         }
 656
 657         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 658         {
 659                 // check if the linking module wants to know about OUR metadata
 660                 if (extname == "ssl")
 661                 {
 662                         // check if this user has an swhois field to send
 663                         if(user->GetExt(extname, dummy))
 664                         {
 665                                 // call this function in the linking module, let it format the data how it
 666                                 // sees fit, and send it on its way. We dont need or want to know how.
 667                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 668                         }
 669                 }
 670         }
 671
 672         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 673         {
 674                 // check if its our metadata key, and its associated with a user
 675                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 676                 {
 677                         userrec* dest = (userrec*)target;
 678                         // if they dont already have an ssl flag, accept the remote server's
 679                         if (!dest->GetExt(extname, dummy))
 680                         {
 681                                 dest->Extend(extname, "ON");
 682                         }
 683                 }
 684         }
 685
 686         bool Handshake(issl_session* session)
 687         {
 688                 int ret;
 689
 690                 if (session->outbound)
 691                         ret = SSL_connect(session->sess);
 692                 else
 693                         ret = SSL_accept(session->sess);
 694
 695                 if (ret < 0)
 696                 {
 697                         int err = SSL_get_error(session->sess, ret);
 698
 699                         if (err == SSL_ERROR_WANT_READ)
 700                         {
 701                                 session->rstat = ISSL_READ;
 702                                 session->status = ISSL_HANDSHAKING;
 703                         }
 704                         else if (err == SSL_ERROR_WANT_WRITE)
 705                         {
 706                                 session->wstat = ISSL_WRITE;
 707                                 session->status = ISSL_HANDSHAKING;
 708                                 MakePollWrite(session);
 709                         }
 710                         else
 711                         {
 712                                 CloseSession(session);
 713                         }
 714
 715                         return false;
 716                 }
 717                 else if (ret > 0)
 718                 {
 719                         // Handshake complete.
 720                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 721                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 722                         if (u)
 723                         {
 724                                 if (!u->GetExt("ssl", dummy))
 725                                         u->Extend("ssl", "ON");
 726                         }
 727
 728                         session->status = ISSL_OPEN;
 729
 730                         MakePollWrite(session);
 731
 732                         return true;
 733                 }
 734                 else if (ret == 0)
 735                 {
 736                         CloseSession(session);
 737                         return true;
 738                 }
 739
 740                 return true;
 741         }
 742
 743         virtual void OnPostConnect(userrec* user)
 744         {
 745                 // This occurs AFTER OnUserConnect so we can be sure the
 746                 // protocol module has propogated the NICK message.
 747                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 748                 {
 749                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 750                         std::deque<std::string>* metadata = new std::deque<std::string>;
 751                         metadata->push_back(user->nick);
 752                         metadata->push_back("ssl");             // The metadata id
 753                         metadata->push_back("ON");              // The value to send
 754                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 755                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 756                         DELETE(event);
 757                         DELETE(metadata);
 758
 759                         VerifyCertificate(&sessions[user->GetFd()], user);
 760                         if (sessions[user->GetFd()].sess)
 761                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 762                 }
 763         }
 764
 765         void MakePollWrite(issl_session* session)
 766         {
 767                 OnRawSocketWrite(session->fd, NULL, 0);
 768         }
 769
 770         void CloseSession(issl_session* session)
 771         {
 772                 if (session->sess)
 773                 {
 774                         SSL_shutdown(session->sess);
 775                         SSL_free(session->sess);
 776                 }
 777
 778                 if (session->inbuf)
 779                 {
 780                         delete[] session->inbuf;
 781                 }
 782
 783                 session->outbuf.clear();
 784                 session->inbuf = NULL;
 785                 session->sess = NULL;
 786                 session->status = ISSL_NONE;
 787         }
 788
 789         void VerifyCertificate(issl_session* session, Extensible* user)
 790         {
 791                 if (!session->sess || !user)
 792                         return;
 793
 794                 X509* cert;
 795                 ssl_cert* certinfo = new ssl_cert;
 796                 unsigned int n;
 797                 unsigned char md[EVP_MAX_MD_SIZE];
 798                 const EVP_MD *digest = EVP_md5();
 799
 800                 user->Extend("ssl_cert",certinfo);
 801
 802                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 803
 804                 if (!cert)
 805                 {
 806                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 807                         return;
 808                 }
 809
 810                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 811
 812                 if (SelfSigned)
 813                 {
 814                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 815                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 816                 }
 817                 else
 818                 {
 819                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 820                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 821                 }
 822
 823                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 824                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 825
 826                 if (!X509_digest(cert, digest, md, &n))
 827                 {
 828                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 829                 }
 830                 else
 831                 {
 832                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 833                 }
 834
 835                 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))
 836                 {
 837                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 838                 }
 839
 840                 X509_free(cert);
 841         }
 842 };
 843
 844 static int error_callback(const char *str, size_t len, void *u)
 845 {
 846         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 847         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 848         return 0;
 849 }
 850
 851 class ModuleSSLOpenSSLFactory : public ModuleFactory
 852 {
 853  public:
 854         ModuleSSLOpenSSLFactory()
 855         {
 856         }
 857
 858         ~ModuleSSLOpenSSLFactory()
 859         {
 860         }
 861
 862         virtual Module * CreateModule(InspIRCd* Me)
 863         {
 864                 return new ModuleSSLOpenSSL(Me);
 865         }
 866 };
 867
 868
 869 extern "C" DllExport void * init_module( void )
 870 {
 871         return new ModuleSSLOpenSSLFactory;
 872 }