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 #include "inspircd_config.h"
  21 #include "configreader.h"
  22 #include "users.h"
  23 #include "channels.h"
  24 #include "modules.h"
  25
  26 #include "socket.h"
  27 #include "hashcomp.h"
  28 #include "inspircd.h"
  29
  30 #include "transport.h"
  31
  32 /* $ModDesc: Provides SSL support for clients */
  33 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  34 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  35 /* $ModDep: transport.h */
  36
  37 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  38 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  39
  40 static bool SelfSigned = false;
  41
  42 bool isin(int port, const std::vector<int> &portlist)
  43 {
  44         for(unsigned int i = 0; i < portlist.size(); i++)
  45                 if(portlist[i] == port)
  46                         return true;
  47
  48         return false;
  49 }
  50
  51 char* get_error()
  52 {
  53         return ERR_error_string(ERR_get_error(), NULL);
  54 }
  55
  56 static int error_callback(const char *str, size_t len, void *u);
  57
  58 /** Represents an SSL user's extra data
  59  */
  60 class issl_session : public classbase
  61 {
  62 public:
  63         SSL* sess;
  64         issl_status status;
  65         issl_io_status rstat;
  66         issl_io_status wstat;
  67
  68         unsigned int inbufoffset;
  69         char* inbuf;                    // Buffer OpenSSL reads into.
  70         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  71         int fd;
  72         bool outbound;
  73
  74         issl_session()
  75         {
  76                 outbound = false;
  77                 rstat = ISSL_READ;
  78                 wstat = ISSL_WRITE;
  79         }
  80 };
  81
  82 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  83 {
  84         /* XXX: This will allow self signed certificates.
  85          * In the future if we want an option to not allow this,
  86          * we can just return preverify_ok here, and openssl
  87          * will boot off self-signed and invalid peer certs.
  88          */
  89         int ve = X509_STORE_CTX_get_error(ctx);
  90
  91         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
  92
  93         return 1;
  94 }
  95
  96 class ModuleSSLOpenSSL : public Module
  97 {
  98
  99         ConfigReader* Conf;
 100
 101         std::vector<int> listenports;
 102
 103         int inbufsize;
 104         issl_session sessions[MAX_DESCRIPTORS];
 105
 106         SSL_CTX* ctx;
 107         SSL_CTX* clictx;
 108
 109         char* dummy;
 110
 111         std::string keyfile;
 112         std::string certfile;
 113         std::string cafile;
 114         // std::string crlfile;
 115         std::string dhfile;
 116
 117         int clientactive;
 118
 119  public:
 120
 121         InspIRCd* PublicInstance;
 122
 123         ModuleSSLOpenSSL(InspIRCd* Me)
 124                 : Module::Module(Me), PublicInstance(Me)
 125         {
 126                 ServerInstance->PublishInterface("InspSocketHook", this);
 127
 128                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 129                 inbufsize = ServerInstance->Config->NetBufferSize;
 130
 131                 /* Global SSL library initialization*/
 132                 SSL_library_init();
 133                 SSL_load_error_strings();
 134
 135                 /* Build our SSL contexts:
 136                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 137                  */
 138                 ctx = SSL_CTX_new( SSLv23_server_method() );
 139                 clictx = SSL_CTX_new( SSLv23_client_method() );
 140
 141                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 142                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 143
 144                 // Needs the flag as it ignores a plain /rehash
 145                 OnRehash(NULL,"ssl");
 146         }
 147
 148         virtual void OnRehash(userrec* user, const std::string &param)
 149         {
 150                 if (param != "ssl")
 151                         return;
 152
 153                 Conf = new ConfigReader(ServerInstance);
 154
 155                 for (unsigned int i = 0; i < listenports.size(); i++)
 156                 {
 157                         ServerInstance->Config->DelIOHook(listenports[i]);
 158                 }
 159
 160                 listenports.clear();
 161                 clientactive = 0;
 162
 163                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 164                 {
 165                         // For each <bind> tag
 166                         if (((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 167                         {
 168                                 // Get the port we're meant to be listening on with SSL
 169                                 std::string port = Conf->ReadValue("bind", "port", i);
 170                                 irc::portparser portrange(port, false);
 171                                 long portno = -1;
 172                                 while ((portno = portrange.GetToken()))
 173                                 {
 174                                         clientactive++;
 175                                         try
 176                                         {
 177                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 178                                                 {
 179                                                         listenports.push_back(portno);
 180                                                                 for (unsigned int i = 0; i < ServerInstance->stats->BoundPortCount; i++)
 181                                                                 if (ServerInstance->Config->ports[i] == portno)
 182                                                                         ServerInstance->Config->openSockfd[i]->SetDescription("ssl");
 183                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 184                                                 }
 185                                                 else
 186                                                 {
 187                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 188                                                 }
 189                                         }
 190                                         catch (ModuleException &e)
 191                                         {
 192                                                 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());
 193                                         }
 194                                 }
 195                         }
 196                 }
 197
 198                 std::string confdir(CONFIG_FILE);
 199                 // +1 so we the path ends with a /
 200                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 201
 202                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 203                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 204                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 205                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 206
 207                 // Set all the default values needed.
 208                 if (cafile == "")
 209                         cafile = "ca.pem";
 210
 211                 if (certfile == "")
 212                         certfile = "cert.pem";
 213
 214                 if (keyfile == "")
 215                         keyfile = "key.pem";
 216
 217                 if (dhfile == "")
 218                         dhfile = "dhparams.pem";
 219
 220                 // Prepend relative paths with the path to the config directory.
 221                 if (cafile[0] != '/')
 222                         cafile = confdir + cafile;
 223
 224                 //if(crlfile[0] != '/')
 225                 //      crlfile = confdir + crlfile;
 226
 227                 if (certfile[0] != '/')
 228                         certfile = confdir + certfile;
 229
 230                 if (keyfile[0] != '/')
 231                         keyfile = confdir + keyfile;
 232
 233                 if (dhfile[0] != '/')
 234                         dhfile = confdir + dhfile;
 235
 236                 /* Load our keys and certificates
 237                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 238                  */
 239                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 240                 {
 241                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 242                         ERR_print_errors_cb(error_callback, this);
 243                 }
 244
 245                 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)))
 246                 {
 247                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 248                         ERR_print_errors_cb(error_callback, this);
 249                 }
 250
 251                 /* Load the CAs we trust*/
 252                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 253                 {
 254                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 255                         ERR_print_errors_cb(error_callback, this);
 256                 }
 257
 258                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 259                 DH* ret;
 260
 261                 if (dhpfile == NULL)
 262                 {
 263                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 264                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 265                 }
 266                 else
 267                 {
 268                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 269                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 270                         {
 271                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 272                                 ERR_print_errors_cb(error_callback, this);
 273                         }
 274                 }
 275
 276                 fclose(dhpfile);
 277
 278                 DELETE(Conf);
 279         }
 280
 281         virtual ~ModuleSSLOpenSSL()
 282         {
 283                 SSL_CTX_free(ctx);
 284                 SSL_CTX_free(clictx);
 285         }
 286
 287         virtual void OnCleanup(int target_type, void* item)
 288         {
 289                 if (target_type == TYPE_USER)
 290                 {
 291                         userrec* user = (userrec*)item;
 292
 293                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 294                         {
 295                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 296                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 297                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 298                         }
 299                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 300                         {
 301                                 ssl_cert* tofree;
 302                                 user->GetExt("ssl_cert", tofree);
 303                                 delete tofree;
 304                                 user->Shrink("ssl_cert");
 305                         }
 306                 }
 307         }
 308
 309         virtual void OnUnloadModule(Module* mod, const std::string &name)
 310         {
 311                 if (mod == this)
 312                 {
 313                         for(unsigned int i = 0; i < listenports.size(); i++)
 314                         {
 315                                 ServerInstance->Config->DelIOHook(listenports[i]);
 316                                 for (unsigned int j = 0; j < ServerInstance->stats->BoundPortCount; j++)
 317                                         if (ServerInstance->Config->ports[j] == listenports[i])
 318                                                 if (ServerInstance->Config->openSockfd[j])
 319                                                         ServerInstance->Config->openSockfd[j]->SetDescription("plaintext");
 320                         }
 321                 }
 322         }
 323
 324         virtual Version GetVersion()
 325         {
 326                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 327         }
 328
 329         void Implements(char* List)
 330         {
 331                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 332                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 333         }
 334
 335         virtual char* OnRequest(Request* request)
 336         {
 337                 ISHRequest* ISR = (ISHRequest*)request;
 338                 if (strcmp("IS_NAME", request->GetId()) == 0)
 339                 {
 340                         return "openssl";
 341                 }
 342                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 343                 {
 344                         char* ret = "OK";
 345                         try
 346                         {
 347                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 348                         }
 349                         catch (ModuleException &e)
 350                         {
 351                                 return NULL;
 352                         }
 353
 354                         return ret;
 355                 }
 356                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 357                 {
 358                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 359                 }
 360                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 361                 {
 362                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 363                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 364                 }
 365                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 366                 {
 367                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 368                         if (session)
 369                         {
 370                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 371                                 return "OK";
 372                         }
 373                 }
 374                 return NULL;
 375         }
 376
 377
 378         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 379         {
 380                 issl_session* session = &sessions[fd];
 381
 382                 session->fd = fd;
 383                 session->inbuf = new char[inbufsize];
 384                 session->inbufoffset = 0;
 385                 session->sess = SSL_new(ctx);
 386                 session->status = ISSL_NONE;
 387                 session->outbound = false;
 388
 389                 if (session->sess == NULL)
 390                         return;
 391
 392                 if (SSL_set_fd(session->sess, fd) == 0)
 393                 {
 394                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 395                         return;
 396                 }
 397
 398                 Handshake(session);
 399         }
 400
 401         virtual void OnRawSocketConnect(int fd)
 402         {
 403                 issl_session* session = &sessions[fd];
 404
 405                 session->fd = fd;
 406                 session->inbuf = new char[inbufsize];
 407                 session->inbufoffset = 0;
 408                 session->sess = SSL_new(clictx);
 409                 session->status = ISSL_NONE;
 410                 session->outbound = true;
 411
 412                 if (session->sess == NULL)
 413                         return;
 414
 415                 if (SSL_set_fd(session->sess, fd) == 0)
 416                 {
 417                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 418                         return;
 419                 }
 420
 421                 Handshake(session);
 422         }
 423
 424         virtual void OnRawSocketClose(int fd)
 425         {
 426                 CloseSession(&sessions[fd]);
 427
 428                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 429
 430                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 431                 {
 432                         ssl_cert* tofree;
 433                         user->GetExt("ssl_cert", tofree);
 434                         delete tofree;
 435                         user->Shrink("ssl_cert");
 436                 }
 437         }
 438
 439         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 440         {
 441                 issl_session* session = &sessions[fd];
 442
 443                 if (!session->sess)
 444                 {
 445                         readresult = 0;
 446                         CloseSession(session);
 447                         return 1;
 448                 }
 449
 450                 if (session->status == ISSL_HANDSHAKING)
 451                 {
 452                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 453                         {
 454                                 // The handshake isn't finished and it wants to read, try to finish it.
 455                                 if (!Handshake(session))
 456                                 {
 457                                         // Couldn't resume handshake.
 458                                         return -1;
 459                                 }
 460                         }
 461                         else
 462                         {
 463                                 return -1;
 464                         }
 465                 }
 466
 467                 // If we resumed the handshake then session->status will be ISSL_OPEN
 468
 469                 if (session->status == ISSL_OPEN)
 470                 {
 471                         if (session->wstat == ISSL_READ)
 472                         {
 473                                 if(DoWrite(session) == 0)
 474                                         return 0;
 475                         }
 476
 477                         if (session->rstat == ISSL_READ)
 478                         {
 479                                 int ret = DoRead(session);
 480
 481                                 if (ret > 0)
 482                                 {
 483                                         if (count <= session->inbufoffset)
 484                                         {
 485                                                 memcpy(buffer, session->inbuf, count);
 486                                                 // Move the stuff left in inbuf to the beginning of it
 487                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 488                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 489                                                 session->inbufoffset -= count;
 490                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 491                                                 readresult = count;
 492                                         }
 493                                         else
 494                                         {
 495                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 496                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 497
 498                                                 readresult = session->inbufoffset;
 499                                                 // Zero the offset, as there's nothing there..
 500                                                 session->inbufoffset = 0;
 501                                         }
 502
 503                                         return 1;
 504                                 }
 505                                 else
 506                                 {
 507                                         return ret;
 508                                 }
 509                         }
 510                 }
 511
 512                 return -1;
 513         }
 514
 515         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 516         {
 517                 issl_session* session = &sessions[fd];
 518
 519                 if (!session->sess)
 520                 {
 521                         CloseSession(session);
 522                         return -1;
 523                 }
 524
 525                 session->outbuf.append(buffer, count);
 526
 527                 if (session->status == ISSL_HANDSHAKING)
 528                 {
 529                         // The handshake isn't finished, try to finish it.
 530                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 531                                 Handshake(session);
 532                 }
 533
 534                 if (session->status == ISSL_OPEN)
 535                 {
 536                         if (session->rstat == ISSL_WRITE)
 537                                 DoRead(session);
 538
 539                         if (session->wstat == ISSL_WRITE)
 540                                 return DoWrite(session);
 541                 }
 542
 543                 return 1;
 544         }
 545
 546         int DoWrite(issl_session* session)
 547         {
 548                 if (!session->outbuf.size())
 549                         return -1;
 550
 551                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 552
 553                 if (ret == 0)
 554                 {
 555                         CloseSession(session);
 556                         return 0;
 557                 }
 558                 else if (ret < 0)
 559                 {
 560                         int err = SSL_get_error(session->sess, ret);
 561
 562                         if (err == SSL_ERROR_WANT_WRITE)
 563                         {
 564                                 session->wstat = ISSL_WRITE;
 565                                 return -1;
 566                         }
 567                         else if (err == SSL_ERROR_WANT_READ)
 568                         {
 569                                 session->wstat = ISSL_READ;
 570                                 return -1;
 571                         }
 572                         else
 573                         {
 574                                 CloseSession(session);
 575                                 return 0;
 576                         }
 577                 }
 578                 else
 579                 {
 580                         session->outbuf = session->outbuf.substr(ret);
 581                         return ret;
 582                 }
 583         }
 584
 585         int DoRead(issl_session* session)
 586         {
 587                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 588                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 589
 590                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 591
 592                 if (ret == 0)
 593                 {
 594                         // Client closed connection.
 595                         CloseSession(session);
 596                         return 0;
 597                 }
 598                 else if (ret < 0)
 599                 {
 600                         int err = SSL_get_error(session->sess, ret);
 601
 602                         if (err == SSL_ERROR_WANT_READ)
 603                         {
 604                                 session->rstat = ISSL_READ;
 605                                 return -1;
 606                         }
 607                         else if (err == SSL_ERROR_WANT_WRITE)
 608                         {
 609                                 session->rstat = ISSL_WRITE;
 610                                 return -1;
 611                         }
 612                         else
 613                         {
 614                                 CloseSession(session);
 615                                 return 0;
 616                         }
 617                 }
 618                 else
 619                 {
 620                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 621                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 622                         // 'buffer' is 'count' long
 623
 624                         session->inbufoffset += ret;
 625
 626                         return ret;
 627                 }
 628         }
 629
 630         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 631         virtual void OnWhois(userrec* source, userrec* dest)
 632         {
 633                 if (!clientactive)
 634                         return;
 635
 636                 // Bugfix, only send this numeric for *our* SSL users
 637                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 638                 {
 639                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 640                 }
 641         }
 642
 643         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 644         {
 645                 // check if the linking module wants to know about OUR metadata
 646                 if (extname == "ssl")
 647                 {
 648                         // check if this user has an swhois field to send
 649                         if(user->GetExt(extname, dummy))
 650                         {
 651                                 // call this function in the linking module, let it format the data how it
 652                                 // sees fit, and send it on its way. We dont need or want to know how.
 653                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 654                         }
 655                 }
 656         }
 657
 658         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 659         {
 660                 // check if its our metadata key, and its associated with a user
 661                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 662                 {
 663                         userrec* dest = (userrec*)target;
 664                         // if they dont already have an ssl flag, accept the remote server's
 665                         if (!dest->GetExt(extname, dummy))
 666                         {
 667                                 dest->Extend(extname, "ON");
 668                         }
 669                 }
 670         }
 671
 672         bool Handshake(issl_session* session)
 673         {
 674                 int ret;
 675
 676                 if (session->outbound)
 677                         ret = SSL_connect(session->sess);
 678                 else
 679                         ret = SSL_accept(session->sess);
 680
 681                 if (ret < 0)
 682                 {
 683                         int err = SSL_get_error(session->sess, ret);
 684
 685                         if (err == SSL_ERROR_WANT_READ)
 686                         {
 687                                 session->rstat = ISSL_READ;
 688                                 session->status = ISSL_HANDSHAKING;
 689                         }
 690                         else if (err == SSL_ERROR_WANT_WRITE)
 691                         {
 692                                 session->wstat = ISSL_WRITE;
 693                                 session->status = ISSL_HANDSHAKING;
 694                                 MakePollWrite(session);
 695                         }
 696                         else
 697                         {
 698                                 CloseSession(session);
 699                         }
 700
 701                         return false;
 702                 }
 703                 else if (ret > 0)
 704                 {
 705                         // Handshake complete.
 706                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 707                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 708                         if (u)
 709                         {
 710                                 if (!u->GetExt("ssl", dummy))
 711                                         u->Extend("ssl", "ON");
 712                         }
 713
 714                         session->status = ISSL_OPEN;
 715
 716                         MakePollWrite(session);
 717
 718                         return true;
 719                 }
 720                 else if (ret == 0)
 721                 {
 722                         CloseSession(session);
 723                         return true;
 724                 }
 725
 726                 return true;
 727         }
 728
 729         virtual void OnPostConnect(userrec* user)
 730         {
 731                 // This occurs AFTER OnUserConnect so we can be sure the
 732                 // protocol module has propogated the NICK message.
 733                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 734                 {
 735                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 736                         std::deque<std::string>* metadata = new std::deque<std::string>;
 737                         metadata->push_back(user->nick);
 738                         metadata->push_back("ssl");             // The metadata id
 739                         metadata->push_back("ON");              // The value to send
 740                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 741                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 742                         DELETE(event);
 743                         DELETE(metadata);
 744
 745                         VerifyCertificate(&sessions[user->GetFd()], user);
 746                 }
 747         }
 748
 749         void MakePollWrite(issl_session* session)
 750         {
 751                 OnRawSocketWrite(session->fd, NULL, 0);
 752         }
 753
 754         void CloseSession(issl_session* session)
 755         {
 756                 if (session->sess)
 757                 {
 758                         SSL_shutdown(session->sess);
 759                         SSL_free(session->sess);
 760                 }
 761
 762                 if (session->inbuf)
 763                 {
 764                         delete[] session->inbuf;
 765                 }
 766
 767                 session->outbuf.clear();
 768                 session->inbuf = NULL;
 769                 session->sess = NULL;
 770                 session->status = ISSL_NONE;
 771         }
 772
 773         void VerifyCertificate(issl_session* session, Extensible* user)
 774         {
 775                 X509* cert;
 776                 ssl_cert* certinfo = new ssl_cert;
 777                 unsigned int n;
 778                 unsigned char md[EVP_MAX_MD_SIZE];
 779                 const EVP_MD *digest = EVP_md5();
 780
 781                 user->Extend("ssl_cert",certinfo);
 782
 783                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 784
 785                 if (!cert)
 786                 {
 787                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 788                         return;
 789                 }
 790
 791                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 792
 793                 if (SelfSigned)
 794                 {
 795                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 796                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 797                 }
 798                 else
 799                 {
 800                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 801                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 802                 }
 803
 804                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 805                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 806
 807                 if (!X509_digest(cert, digest, md, &n))
 808                 {
 809                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 810                 }
 811                 else
 812                 {
 813                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 814                 }
 815
 816                 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))
 817                 {
 818                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 819                 }
 820
 821                 X509_free(cert);
 822         }
 823 };
 824
 825 static int error_callback(const char *str, size_t len, void *u)
 826 {
 827         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 828         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 829         return 0;
 830 }
 831
 832 class ModuleSSLOpenSSLFactory : public ModuleFactory
 833 {
 834  public:
 835         ModuleSSLOpenSSLFactory()
 836         {
 837         }
 838
 839         ~ModuleSSLOpenSSLFactory()
 840         {
 841         }
 842
 843         virtual Module * CreateModule(InspIRCd* Me)
 844         {
 845                 return new ModuleSSLOpenSSL(Me);
 846         }
 847 };
 848
 849
 850 extern "C" void * init_module( void )
 851 {
 852         return new ModuleSSLOpenSSLFactory;
 853 }