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         char cipher[MAXBUF];
 111
 112         std::string keyfile;
 113         std::string certfile;
 114         std::string cafile;
 115         // std::string crlfile;
 116         std::string dhfile;
 117
 118         int clientactive;
 119
 120  public:
 121
 122         InspIRCd* PublicInstance;
 123
 124         ModuleSSLOpenSSL(InspIRCd* Me)
 125                 : Module::Module(Me), PublicInstance(Me)
 126         {
 127                 ServerInstance->PublishInterface("InspSocketHook", this);
 128
 129                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 130                 inbufsize = ServerInstance->Config->NetBufferSize;
 131
 132                 /* Global SSL library initialization*/
 133                 SSL_library_init();
 134                 SSL_load_error_strings();
 135
 136                 /* Build our SSL contexts:
 137                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 138                  */
 139                 ctx = SSL_CTX_new( SSLv23_server_method() );
 140                 clictx = SSL_CTX_new( SSLv23_client_method() );
 141
 142                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 143                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 144
 145                 // Needs the flag as it ignores a plain /rehash
 146                 OnRehash(NULL,"ssl");
 147         }
 148
 149         virtual void OnRehash(userrec* user, const std::string &param)
 150         {
 151                 if (param != "ssl")
 152                         return;
 153
 154                 Conf = new ConfigReader(ServerInstance);
 155
 156                 for (unsigned int i = 0; i < listenports.size(); i++)
 157                 {
 158                         ServerInstance->Config->DelIOHook(listenports[i]);
 159                 }
 160
 161                 listenports.clear();
 162                 clientactive = 0;
 163
 164                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 165                 {
 166                         // For each <bind> tag
 167                         if (((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 168                         {
 169                                 // Get the port we're meant to be listening on with SSL
 170                                 std::string port = Conf->ReadValue("bind", "port", i);
 171                                 irc::portparser portrange(port, false);
 172                                 long portno = -1;
 173                                 while ((portno = portrange.GetToken()))
 174                                 {
 175                                         clientactive++;
 176                                         try
 177                                         {
 178                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 179                                                 {
 180                                                         listenports.push_back(portno);
 181                                                                 for (unsigned int i = 0; i < ServerInstance->stats->BoundPortCount; i++)
 182                                                                 if (ServerInstance->Config->ports[i] == portno)
 183                                                                         ServerInstance->Config->openSockfd[i]->SetDescription("ssl");
 184                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 185                                                 }
 186                                                 else
 187                                                 {
 188                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 189                                                 }
 190                                         }
 191                                         catch (ModuleException &e)
 192                                         {
 193                                                 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());
 194                                         }
 195                                 }
 196                         }
 197                 }
 198
 199                 std::string confdir(ServerInstance->ConfigFileName);
 200                 // +1 so we the path ends with a /
 201                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 202
 203                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 204                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 205                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 206                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 207
 208                 // Set all the default values needed.
 209                 if (cafile == "")
 210                         cafile = "ca.pem";
 211
 212                 if (certfile == "")
 213                         certfile = "cert.pem";
 214
 215                 if (keyfile == "")
 216                         keyfile = "key.pem";
 217
 218                 if (dhfile == "")
 219                         dhfile = "dhparams.pem";
 220
 221                 // Prepend relative paths with the path to the config directory.
 222                 if (cafile[0] != '/')
 223                         cafile = confdir + cafile;
 224
 225                 //if(crlfile[0] != '/')
 226                 //      crlfile = confdir + crlfile;
 227
 228                 if (certfile[0] != '/')
 229                         certfile = confdir + certfile;
 230
 231                 if (keyfile[0] != '/')
 232                         keyfile = confdir + keyfile;
 233
 234                 if (dhfile[0] != '/')
 235                         dhfile = confdir + dhfile;
 236
 237                 /* Load our keys and certificates
 238                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 239                  */
 240                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 241                 {
 242                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 243                         ERR_print_errors_cb(error_callback, this);
 244                 }
 245
 246                 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)))
 247                 {
 248                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 249                         ERR_print_errors_cb(error_callback, this);
 250                 }
 251
 252                 /* Load the CAs we trust*/
 253                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 254                 {
 255                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 256                         ERR_print_errors_cb(error_callback, this);
 257                 }
 258
 259                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 260                 DH* ret;
 261
 262                 if (dhpfile == NULL)
 263                 {
 264                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 265                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 266                 }
 267                 else
 268                 {
 269                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 270                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 271                         {
 272                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 273                                 ERR_print_errors_cb(error_callback, this);
 274                         }
 275                 }
 276
 277                 fclose(dhpfile);
 278
 279                 DELETE(Conf);
 280         }
 281
 282         virtual ~ModuleSSLOpenSSL()
 283         {
 284                 SSL_CTX_free(ctx);
 285                 SSL_CTX_free(clictx);
 286         }
 287
 288         virtual void OnCleanup(int target_type, void* item)
 289         {
 290                 if (target_type == TYPE_USER)
 291                 {
 292                         userrec* user = (userrec*)item;
 293
 294                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 295                         {
 296                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 297                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 298                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 299                         }
 300                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 301                         {
 302                                 ssl_cert* tofree;
 303                                 user->GetExt("ssl_cert", tofree);
 304                                 delete tofree;
 305                                 user->Shrink("ssl_cert");
 306                         }
 307                 }
 308         }
 309
 310         virtual void OnUnloadModule(Module* mod, const std::string &name)
 311         {
 312                 if (mod == this)
 313                 {
 314                         for(unsigned int i = 0; i < listenports.size(); i++)
 315                         {
 316                                 ServerInstance->Config->DelIOHook(listenports[i]);
 317                                 for (unsigned int j = 0; j < ServerInstance->stats->BoundPortCount; j++)
 318                                         if (ServerInstance->Config->ports[j] == listenports[i])
 319                                                 if (ServerInstance->Config->openSockfd[j])
 320                                                         ServerInstance->Config->openSockfd[j]->SetDescription("plaintext");
 321                         }
 322                 }
 323         }
 324
 325         virtual Version GetVersion()
 326         {
 327                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 328         }
 329
 330         void Implements(char* List)
 331         {
 332                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 333                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 334         }
 335
 336         virtual char* OnRequest(Request* request)
 337         {
 338                 ISHRequest* ISR = (ISHRequest*)request;
 339                 if (strcmp("IS_NAME", request->GetId()) == 0)
 340                 {
 341                         return "openssl";
 342                 }
 343                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 344                 {
 345                         char* ret = "OK";
 346                         try
 347                         {
 348                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 349                         }
 350                         catch (ModuleException &e)
 351                         {
 352                                 return NULL;
 353                         }
 354
 355                         return ret;
 356                 }
 357                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 358                 {
 359                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 360                 }
 361                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 362                 {
 363                         if (ISR->Sock->GetFd() < 0)
 364                                 return (char*)"OK";
 365
 366                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 367                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 368                 }
 369                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 370                 {
 371                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 372                         if (session->sess)
 373                         {
 374                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 375                                 return "OK";
 376                         }
 377                 }
 378                 return NULL;
 379         }
 380
 381
 382         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 383         {
 384                 issl_session* session = &sessions[fd];
 385
 386                 session->fd = fd;
 387                 session->inbuf = new char[inbufsize];
 388                 session->inbufoffset = 0;
 389                 session->sess = SSL_new(ctx);
 390                 session->status = ISSL_NONE;
 391                 session->outbound = false;
 392
 393                 if (session->sess == NULL)
 394                         return;
 395
 396                 if (SSL_set_fd(session->sess, fd) == 0)
 397                 {
 398                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 399                         return;
 400                 }
 401
 402                 Handshake(session);
 403         }
 404
 405         virtual void OnRawSocketConnect(int fd)
 406         {
 407                 issl_session* session = &sessions[fd];
 408
 409                 session->fd = fd;
 410                 session->inbuf = new char[inbufsize];
 411                 session->inbufoffset = 0;
 412                 session->sess = SSL_new(clictx);
 413                 session->status = ISSL_NONE;
 414                 session->outbound = true;
 415
 416                 if (session->sess == NULL)
 417                         return;
 418
 419                 if (SSL_set_fd(session->sess, fd) == 0)
 420                 {
 421                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 422                         return;
 423                 }
 424
 425                 Handshake(session);
 426         }
 427
 428         virtual void OnRawSocketClose(int fd)
 429         {
 430                 CloseSession(&sessions[fd]);
 431
 432                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 433
 434                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 435                 {
 436                         ssl_cert* tofree;
 437                         user->GetExt("ssl_cert", tofree);
 438                         delete tofree;
 439                         user->Shrink("ssl_cert");
 440                 }
 441         }
 442
 443         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 444         {
 445                 issl_session* session = &sessions[fd];
 446
 447                 if (!session->sess)
 448                 {
 449                         readresult = 0;
 450                         CloseSession(session);
 451                         return 1;
 452                 }
 453
 454                 if (session->status == ISSL_HANDSHAKING)
 455                 {
 456                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 457                         {
 458                                 // The handshake isn't finished and it wants to read, try to finish it.
 459                                 if (!Handshake(session))
 460                                 {
 461                                         // Couldn't resume handshake.
 462                                         return -1;
 463                                 }
 464                         }
 465                         else
 466                         {
 467                                 return -1;
 468                         }
 469                 }
 470
 471                 // If we resumed the handshake then session->status will be ISSL_OPEN
 472
 473                 if (session->status == ISSL_OPEN)
 474                 {
 475                         if (session->wstat == ISSL_READ)
 476                         {
 477                                 if(DoWrite(session) == 0)
 478                                         return 0;
 479                         }
 480
 481                         if (session->rstat == ISSL_READ)
 482                         {
 483                                 int ret = DoRead(session);
 484
 485                                 if (ret > 0)
 486                                 {
 487                                         if (count <= session->inbufoffset)
 488                                         {
 489                                                 memcpy(buffer, session->inbuf, count);
 490                                                 // Move the stuff left in inbuf to the beginning of it
 491                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 492                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 493                                                 session->inbufoffset -= count;
 494                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 495                                                 readresult = count;
 496                                         }
 497                                         else
 498                                         {
 499                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 500                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 501
 502                                                 readresult = session->inbufoffset;
 503                                                 // Zero the offset, as there's nothing there..
 504                                                 session->inbufoffset = 0;
 505                                         }
 506
 507                                         return 1;
 508                                 }
 509                                 else
 510                                 {
 511                                         return ret;
 512                                 }
 513                         }
 514                 }
 515
 516                 return -1;
 517         }
 518
 519         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 520         {
 521                 issl_session* session = &sessions[fd];
 522
 523                 if (!session->sess)
 524                 {
 525                         CloseSession(session);
 526                         return -1;
 527                 }
 528
 529                 session->outbuf.append(buffer, count);
 530
 531                 if (session->status == ISSL_HANDSHAKING)
 532                 {
 533                         // The handshake isn't finished, try to finish it.
 534                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 535                                 Handshake(session);
 536                 }
 537
 538                 if (session->status == ISSL_OPEN)
 539                 {
 540                         if (session->rstat == ISSL_WRITE)
 541                                 DoRead(session);
 542
 543                         if (session->wstat == ISSL_WRITE)
 544                                 return DoWrite(session);
 545                 }
 546
 547                 return 1;
 548         }
 549
 550         int DoWrite(issl_session* session)
 551         {
 552                 if (!session->outbuf.size())
 553                         return -1;
 554
 555                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 556
 557                 if (ret == 0)
 558                 {
 559                         CloseSession(session);
 560                         return 0;
 561                 }
 562                 else if (ret < 0)
 563                 {
 564                         int err = SSL_get_error(session->sess, ret);
 565
 566                         if (err == SSL_ERROR_WANT_WRITE)
 567                         {
 568                                 session->wstat = ISSL_WRITE;
 569                                 return -1;
 570                         }
 571                         else if (err == SSL_ERROR_WANT_READ)
 572                         {
 573                                 session->wstat = ISSL_READ;
 574                                 return -1;
 575                         }
 576                         else
 577                         {
 578                                 CloseSession(session);
 579                                 return 0;
 580                         }
 581                 }
 582                 else
 583                 {
 584                         session->outbuf = session->outbuf.substr(ret);
 585                         return ret;
 586                 }
 587         }
 588
 589         int DoRead(issl_session* session)
 590         {
 591                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 592                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 593
 594                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 595
 596                 if (ret == 0)
 597                 {
 598                         // Client closed connection.
 599                         CloseSession(session);
 600                         return 0;
 601                 }
 602                 else if (ret < 0)
 603                 {
 604                         int err = SSL_get_error(session->sess, ret);
 605
 606                         if (err == SSL_ERROR_WANT_READ)
 607                         {
 608                                 session->rstat = ISSL_READ;
 609                                 return -1;
 610                         }
 611                         else if (err == SSL_ERROR_WANT_WRITE)
 612                         {
 613                                 session->rstat = ISSL_WRITE;
 614                                 return -1;
 615                         }
 616                         else
 617                         {
 618                                 CloseSession(session);
 619                                 return 0;
 620                         }
 621                 }
 622                 else
 623                 {
 624                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 625                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 626                         // 'buffer' is 'count' long
 627
 628                         session->inbufoffset += ret;
 629
 630                         return ret;
 631                 }
 632         }
 633
 634         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 635         virtual void OnWhois(userrec* source, userrec* dest)
 636         {
 637                 if (!clientactive)
 638                         return;
 639
 640                 // Bugfix, only send this numeric for *our* SSL users
 641                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 642                 {
 643                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 644                 }
 645         }
 646
 647         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 648         {
 649                 // check if the linking module wants to know about OUR metadata
 650                 if (extname == "ssl")
 651                 {
 652                         // check if this user has an swhois field to send
 653                         if(user->GetExt(extname, dummy))
 654                         {
 655                                 // call this function in the linking module, let it format the data how it
 656                                 // sees fit, and send it on its way. We dont need or want to know how.
 657                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
 658                         }
 659                 }
 660         }
 661
 662         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 663         {
 664                 // check if its our metadata key, and its associated with a user
 665                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 666                 {
 667                         userrec* dest = (userrec*)target;
 668                         // if they dont already have an ssl flag, accept the remote server's
 669                         if (!dest->GetExt(extname, dummy))
 670                         {
 671                                 dest->Extend(extname, "ON");
 672                         }
 673                 }
 674         }
 675
 676         bool Handshake(issl_session* session)
 677         {
 678                 int ret;
 679
 680                 if (session->outbound)
 681                         ret = SSL_connect(session->sess);
 682                 else
 683                         ret = SSL_accept(session->sess);
 684
 685                 if (ret < 0)
 686                 {
 687                         int err = SSL_get_error(session->sess, ret);
 688
 689                         if (err == SSL_ERROR_WANT_READ)
 690                         {
 691                                 session->rstat = ISSL_READ;
 692                                 session->status = ISSL_HANDSHAKING;
 693                         }
 694                         else if (err == SSL_ERROR_WANT_WRITE)
 695                         {
 696                                 session->wstat = ISSL_WRITE;
 697                                 session->status = ISSL_HANDSHAKING;
 698                                 MakePollWrite(session);
 699                         }
 700                         else
 701                         {
 702                                 CloseSession(session);
 703                         }
 704
 705                         return false;
 706                 }
 707                 else if (ret > 0)
 708                 {
 709                         // Handshake complete.
 710                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 711                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 712                         if (u)
 713                         {
 714                                 if (!u->GetExt("ssl", dummy))
 715                                         u->Extend("ssl", "ON");
 716                         }
 717
 718                         session->status = ISSL_OPEN;
 719
 720                         MakePollWrite(session);
 721
 722                         return true;
 723                 }
 724                 else if (ret == 0)
 725                 {
 726                         CloseSession(session);
 727                         return true;
 728                 }
 729
 730                 return true;
 731         }
 732
 733         virtual void OnPostConnect(userrec* user)
 734         {
 735                 // This occurs AFTER OnUserConnect so we can be sure the
 736                 // protocol module has propogated the NICK message.
 737                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 738                 {
 739                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 740                         std::deque<std::string>* metadata = new std::deque<std::string>;
 741                         metadata->push_back(user->nick);
 742                         metadata->push_back("ssl");             // The metadata id
 743                         metadata->push_back("ON");              // The value to send
 744                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 745                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 746                         DELETE(event);
 747                         DELETE(metadata);
 748
 749                         VerifyCertificate(&sessions[user->GetFd()], user);
 750                         if (sessions[user->GetFd()].sess)
 751                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 752                 }
 753         }
 754
 755         void MakePollWrite(issl_session* session)
 756         {
 757                 OnRawSocketWrite(session->fd, NULL, 0);
 758         }
 759
 760         void CloseSession(issl_session* session)
 761         {
 762                 if (session->sess)
 763                 {
 764                         SSL_shutdown(session->sess);
 765                         SSL_free(session->sess);
 766                 }
 767
 768                 if (session->inbuf)
 769                 {
 770                         delete[] session->inbuf;
 771                 }
 772
 773                 session->outbuf.clear();
 774                 session->inbuf = NULL;
 775                 session->sess = NULL;
 776                 session->status = ISSL_NONE;
 777         }
 778
 779         void VerifyCertificate(issl_session* session, Extensible* user)
 780         {
 781                 if (!session->sess || !user)
 782                         return;
 783
 784                 X509* cert;
 785                 ssl_cert* certinfo = new ssl_cert;
 786                 unsigned int n;
 787                 unsigned char md[EVP_MAX_MD_SIZE];
 788                 const EVP_MD *digest = EVP_md5();
 789
 790                 user->Extend("ssl_cert",certinfo);
 791
 792                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 793
 794                 if (!cert)
 795                 {
 796                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 797                         return;
 798                 }
 799
 800                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 801
 802                 if (SelfSigned)
 803                 {
 804                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 805                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 806                 }
 807                 else
 808                 {
 809                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 810                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 811                 }
 812
 813                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 814                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 815
 816                 if (!X509_digest(cert, digest, md, &n))
 817                 {
 818                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 819                 }
 820                 else
 821                 {
 822                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 823                 }
 824
 825                 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))
 826                 {
 827                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 828                 }
 829
 830                 X509_free(cert);
 831         }
 832 };
 833
 834 static int error_callback(const char *str, size_t len, void *u)
 835 {
 836         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 837         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 838         return 0;
 839 }
 840
 841 class ModuleSSLOpenSSLFactory : public ModuleFactory
 842 {
 843  public:
 844         ModuleSSLOpenSSLFactory()
 845         {
 846         }
 847
 848         ~ModuleSSLOpenSSLFactory()
 849         {
 850         }
 851
 852         virtual Module * CreateModule(InspIRCd* Me)
 853         {
 854                 return new ModuleSSLOpenSSL(Me);
 855         }
 856 };
 857
 858
 859 extern "C" void * init_module( void )
 860 {
 861         return new ModuleSSLOpenSSLFactory;
 862 }