src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #include <openssl/ssl.h>
  17 #include <openssl/err.h>
  18
  19 #ifdef WINDOWS
  20 #include <openssl/applink.c>
  21 #endif
  22
  23 #include "configreader.h"
  24 #include "users.h"
  25 #include "channels.h"
  26 #include "modules.h"
  27
  28 #include "socket.h"
  29 #include "hashcomp.h"
  30
  31 #include "transport.h"
  32
  33 #ifdef WINDOWS
  34 #pragma comment(lib, "libeay32MTd")
  35 #pragma comment(lib, "ssleay32MTd")
  36 #undef MAX_DESCRIPTORS
  37 #define MAX_DESCRIPTORS 10000
  38 #endif
  39
  40 /* $ModDesc: Provides SSL support for clients */
  41 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  42 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  43 /* $ModDep: transport.h */
  44
  45 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  46 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  47
  48 static bool SelfSigned = false;
  49
  50 bool isin(int port, const std::vector<int> &portlist)
  51 {
  52         for(unsigned int i = 0; i < portlist.size(); i++)
  53                 if(portlist[i] == port)
  54                         return true;
  55
  56         return false;
  57 }
  58
  59 char* get_error()
  60 {
  61         return ERR_error_string(ERR_get_error(), NULL);
  62 }
  63
  64 static int error_callback(const char *str, size_t len, void *u);
  65
  66 /** Represents an SSL user's extra data
  67  */
  68 class issl_session : public classbase
  69 {
  70 public:
  71         SSL* sess;
  72         issl_status status;
  73         issl_io_status rstat;
  74         issl_io_status wstat;
  75
  76         unsigned int inbufoffset;
  77         char* inbuf;                    // Buffer OpenSSL reads into.
  78         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  79         int fd;
  80         bool outbound;
  81
  82         issl_session()
  83         {
  84                 outbound = false;
  85                 rstat = ISSL_READ;
  86                 wstat = ISSL_WRITE;
  87         }
  88 };
  89
  90 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  91 {
  92         /* XXX: This will allow self signed certificates.
  93          * In the future if we want an option to not allow this,
  94          * we can just return preverify_ok here, and openssl
  95          * will boot off self-signed and invalid peer certs.
  96          */
  97         int ve = X509_STORE_CTX_get_error(ctx);
  98
  99         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 100
 101         return 1;
 102 }
 103
 104 class ModuleSSLOpenSSL : public Module
 105 {
 106
 107         ConfigReader* Conf;
 108
 109         std::vector<int> listenports;
 110
 111         int inbufsize;
 112         issl_session sessions[MAX_DESCRIPTORS];
 113
 114         SSL_CTX* ctx;
 115         SSL_CTX* clictx;
 116
 117         char* dummy;
 118         char cipher[MAXBUF];
 119
 120         std::string keyfile;
 121         std::string certfile;
 122         std::string cafile;
 123         // std::string crlfile;
 124         std::string dhfile;
 125
 126         int clientactive;
 127
 128  public:
 129
 130         InspIRCd* PublicInstance;
 131
 132         ModuleSSLOpenSSL(InspIRCd* Me)
 133                 : Module(Me), PublicInstance(Me)
 134         {
 135                 ServerInstance->PublishInterface("InspSocketHook", this);
 136
 137                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 138                 inbufsize = ServerInstance->Config->NetBufferSize;
 139
 140                 /* Global SSL library initialization*/
 141                 SSL_library_init();
 142                 SSL_load_error_strings();
 143
 144                 /* Build our SSL contexts:
 145                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 146                  */
 147                 ctx = SSL_CTX_new( SSLv23_server_method() );
 148                 clictx = SSL_CTX_new( SSLv23_client_method() );
 149
 150                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 151                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 152
 153                 // Needs the flag as it ignores a plain /rehash
 154                 OnRehash(NULL,"ssl");
 155         }
 156
 157         virtual void OnRehash(userrec* user, const std::string &param)
 158         {
 159                 if (param != "ssl")
 160                         return;
 161
 162                 Conf = new ConfigReader(ServerInstance);
 163
 164                 for (unsigned int i = 0; i < listenports.size(); i++)
 165                 {
 166                         ServerInstance->Config->DelIOHook(listenports[i]);
 167                 }
 168
 169                 listenports.clear();
 170                 clientactive = 0;
 171
 172                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 173                 {
 174                         // For each <bind> tag
 175                         std::string x = Conf->ReadValue("bind", "type", i);
 176                         if (((x.empty()) || (x == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 177                         {
 178                                 // Get the port we're meant to be listening on with SSL
 179                                 std::string port = Conf->ReadValue("bind", "port", i);
 180                                 irc::portparser portrange(port, false);
 181                                 long portno = -1;
 182                                 while ((portno = portrange.GetToken()))
 183                                 {
 184                                         clientactive++;
 185                                         try
 186                                         {
 187                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 188                                                 {
 189                                                         listenports.push_back(portno);
 190                                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 191                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 192                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 193                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 194                                                 }
 195                                                 else
 196                                                 {
 197                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 198                                                 }
 199                                         }
 200                                         catch (ModuleException &e)
 201                                         {
 202                                                 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());
 203                                         }
 204                                 }
 205                         }
 206                 }
 207
 208                 std::string confdir(ServerInstance->ConfigFileName);
 209                 // +1 so we the path ends with a /
 210                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 211
 212                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 213                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 214                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 215                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 216
 217                 // Set all the default values needed.
 218                 if (cafile.empty())
 219                         cafile = "ca.pem";
 220
 221                 if (certfile.empty())
 222                         certfile = "cert.pem";
 223
 224                 if (keyfile.empty())
 225                         keyfile = "key.pem";
 226
 227                 if (dhfile.empty())
 228                         dhfile = "dhparams.pem";
 229
 230                 // Prepend relative paths with the path to the config directory.
 231                 if (cafile[0] != '/')
 232                         cafile = confdir + cafile;
 233
 234                 if (certfile[0] != '/')
 235                         certfile = confdir + certfile;
 236
 237                 if (keyfile[0] != '/')
 238                         keyfile = confdir + keyfile;
 239
 240                 if (dhfile[0] != '/')
 241                         dhfile = confdir + dhfile;
 242
 243                 /* Load our keys and certificates
 244                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 245                  */
 246                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 247                 {
 248                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 249                         ERR_print_errors_cb(error_callback, this);
 250                 }
 251
 252                 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)))
 253                 {
 254                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 255                         ERR_print_errors_cb(error_callback, this);
 256                 }
 257
 258                 /* Load the CAs we trust*/
 259                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 260                 {
 261                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 262                         ERR_print_errors_cb(error_callback, this);
 263                 }
 264
 265                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 266                 DH* ret;
 267
 268                 if (dhpfile == NULL)
 269                 {
 270                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 271                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 272                 }
 273                 else
 274                 {
 275                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 276                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 277                         {
 278                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 279                                 ERR_print_errors_cb(error_callback, this);
 280                         }
 281                 }
 282
 283                 fclose(dhpfile);
 284
 285                 DELETE(Conf);
 286         }
 287
 288         virtual ~ModuleSSLOpenSSL()
 289         {
 290                 SSL_CTX_free(ctx);
 291                 SSL_CTX_free(clictx);
 292         }
 293
 294         virtual void OnCleanup(int target_type, void* item)
 295         {
 296                 if (target_type == TYPE_USER)
 297                 {
 298                         userrec* user = (userrec*)item;
 299
 300                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 301                         {
 302                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 303                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 304                                 ServerInstance->GlobalCulls.AddItem(user, "SSL module unloading");
 305                         }
 306                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 307                         {
 308                                 ssl_cert* tofree;
 309                                 user->GetExt("ssl_cert", tofree);
 310                                 delete tofree;
 311                                 user->Shrink("ssl_cert");
 312                         }
 313                 }
 314         }
 315
 316         virtual void OnUnloadModule(Module* mod, const std::string &name)
 317         {
 318                 if (mod == this)
 319                 {
 320                         for(unsigned int i = 0; i < listenports.size(); i++)
 321                         {
 322                                 ServerInstance->Config->DelIOHook(listenports[i]);
 323                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 324                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 325                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 326                         }
 327                 }
 328         }
 329
 330         virtual Version GetVersion()
 331         {
 332                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 333         }
 334
 335         void Implements(char* List)
 336         {
 337                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
 338                 List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 339         }
 340
 341         virtual char* OnRequest(Request* request)
 342         {
 343                 ISHRequest* ISR = (ISHRequest*)request;
 344                 if (strcmp("IS_NAME", request->GetId()) == 0)
 345                 {
 346                         return "openssl";
 347                 }
 348                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 349                 {
 350                         char* ret = "OK";
 351                         try
 352                         {
 353                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 354                         }
 355                         catch (ModuleException &e)
 356                         {
 357                                 return NULL;
 358                         }
 359
 360                         return ret;
 361                 }
 362                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 363                 {
 364                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 365                 }
 366                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 367                 {
 368                         if (ISR->Sock->GetFd() < 0)
 369                                 return (char*)"OK";
 370
 371                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 372                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 373                 }
 374                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 375                 {
 376                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 377                         if (session->sess)
 378                         {
 379                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 380                                 return "OK";
 381                         }
 382                 }
 383                 return NULL;
 384         }
 385
 386
 387         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 388         {
 389                 issl_session* session = &sessions[fd];
 390
 391                 session->fd = fd;
 392                 session->inbuf = new char[inbufsize];
 393                 session->inbufoffset = 0;
 394                 session->sess = SSL_new(ctx);
 395                 session->status = ISSL_NONE;
 396                 session->outbound = false;
 397
 398                 if (session->sess == NULL)
 399                         return;
 400
 401                 if (SSL_set_fd(session->sess, fd) == 0)
 402                 {
 403                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 404                         return;
 405                 }
 406
 407                 Handshake(session);
 408         }
 409
 410         virtual void OnRawSocketConnect(int fd)
 411         {
 412                 issl_session* session = &sessions[fd];
 413
 414                 session->fd = fd;
 415                 session->inbuf = new char[inbufsize];
 416                 session->inbufoffset = 0;
 417                 session->sess = SSL_new(clictx);
 418                 session->status = ISSL_NONE;
 419                 session->outbound = true;
 420
 421                 if (session->sess == NULL)
 422                         return;
 423
 424                 if (SSL_set_fd(session->sess, fd) == 0)
 425                 {
 426                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 427                         return;
 428                 }
 429
 430                 Handshake(session);
 431         }
 432
 433         virtual void OnRawSocketClose(int fd)
 434         {
 435                 CloseSession(&sessions[fd]);
 436
 437                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 438
 439                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 440                 {
 441                         ssl_cert* tofree;
 442                         user->GetExt("ssl_cert", tofree);
 443                         delete tofree;
 444                         user->Shrink("ssl_cert");
 445                 }
 446         }
 447
 448         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 449         {
 450                 issl_session* session = &sessions[fd];
 451
 452                 if (!session->sess)
 453                 {
 454                         readresult = 0;
 455                         CloseSession(session);
 456                         return 1;
 457                 }
 458
 459                 if (session->status == ISSL_HANDSHAKING)
 460                 {
 461                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 462                         {
 463                                 // The handshake isn't finished and it wants to read, try to finish it.
 464                                 if (!Handshake(session))
 465                                 {
 466                                         // Couldn't resume handshake.
 467                                         return -1;
 468                                 }
 469                         }
 470                         else
 471                         {
 472                                 return -1;
 473                         }
 474                 }
 475
 476                 // If we resumed the handshake then session->status will be ISSL_OPEN
 477
 478                 if (session->status == ISSL_OPEN)
 479                 {
 480                         if (session->wstat == ISSL_READ)
 481                         {
 482                                 if(DoWrite(session) == 0)
 483                                         return 0;
 484                         }
 485
 486                         if (session->rstat == ISSL_READ)
 487                         {
 488                                 int ret = DoRead(session);
 489
 490                                 if (ret > 0)
 491                                 {
 492                                         if (count <= session->inbufoffset)
 493                                         {
 494                                                 memcpy(buffer, session->inbuf, count);
 495                                                 // Move the stuff left in inbuf to the beginning of it
 496                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 497                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 498                                                 session->inbufoffset -= count;
 499                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 500                                                 readresult = count;
 501                                         }
 502                                         else
 503                                         {
 504                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 505                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 506
 507                                                 readresult = session->inbufoffset;
 508                                                 // Zero the offset, as there's nothing there..
 509                                                 session->inbufoffset = 0;
 510                                         }
 511
 512                                         return 1;
 513                                 }
 514                                 else
 515                                 {
 516                                         return ret;
 517                                 }
 518                         }
 519                 }
 520
 521                 return -1;
 522         }
 523
 524         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 525         {
 526                 issl_session* session = &sessions[fd];
 527
 528                 if (!session->sess)
 529                 {
 530                         CloseSession(session);
 531                         return -1;
 532                 }
 533
 534                 session->outbuf.append(buffer, count);
 535
 536                 if (session->status == ISSL_HANDSHAKING)
 537                 {
 538                         // The handshake isn't finished, try to finish it.
 539                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 540                                 Handshake(session);
 541                 }
 542
 543                 if (session->status == ISSL_OPEN)
 544                 {
 545                         if (session->rstat == ISSL_WRITE)
 546                                 DoRead(session);
 547
 548                         if (session->wstat == ISSL_WRITE)
 549                                 return DoWrite(session);
 550                 }
 551
 552                 return 1;
 553         }
 554
 555         int DoWrite(issl_session* session)
 556         {
 557                 if (!session->outbuf.size())
 558                         return -1;
 559
 560                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 561
 562                 if (ret == 0)
 563                 {
 564                         CloseSession(session);
 565                         return 0;
 566                 }
 567                 else if (ret < 0)
 568                 {
 569                         int err = SSL_get_error(session->sess, ret);
 570
 571                         if (err == SSL_ERROR_WANT_WRITE)
 572                         {
 573                                 session->wstat = ISSL_WRITE;
 574                                 return -1;
 575                         }
 576                         else if (err == SSL_ERROR_WANT_READ)
 577                         {
 578                                 session->wstat = ISSL_READ;
 579                                 return -1;
 580                         }
 581                         else
 582                         {
 583                                 CloseSession(session);
 584                                 return 0;
 585                         }
 586                 }
 587                 else
 588                 {
 589                         session->outbuf = session->outbuf.substr(ret);
 590                         return ret;
 591                 }
 592         }
 593
 594         int DoRead(issl_session* session)
 595         {
 596                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 597                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 598
 599                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 600
 601                 if (ret == 0)
 602                 {
 603                         // Client closed connection.
 604                         CloseSession(session);
 605                         return 0;
 606                 }
 607                 else if (ret < 0)
 608                 {
 609                         int err = SSL_get_error(session->sess, ret);
 610
 611                         if (err == SSL_ERROR_WANT_READ)
 612                         {
 613                                 session->rstat = ISSL_READ;
 614                                 return -1;
 615                         }
 616                         else if (err == SSL_ERROR_WANT_WRITE)
 617                         {
 618                                 session->rstat = ISSL_WRITE;
 619                                 return -1;
 620                         }
 621                         else
 622                         {
 623                                 CloseSession(session);
 624                                 return 0;
 625                         }
 626                 }
 627                 else
 628                 {
 629                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 630                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 631                         // 'buffer' is 'count' long
 632
 633                         session->inbufoffset += ret;
 634
 635                         return ret;
 636                 }
 637         }
 638
 639         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 640         virtual void OnWhois(userrec* source, userrec* dest)
 641         {
 642                 if (!clientactive)
 643                         return;
 644
 645                 // Bugfix, only send this numeric for *our* SSL users
 646                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 647                 {
 648                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 649                 }
 650         }
 651
 652         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 653         {
 654                 // check if the linking module wants to know about OUR metadata
 655                 if (extname == "ssl")
 656                 {
 657                         // check if this user has an swhois field to send
 658                         if(user->GetExt(extname, dummy))
 659                         {
 660                                 // call this function in the linking module, let it format the data how it
 661                                 // sees fit, and send it on its way. We dont need or want to know how.
 662                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 663                         }
 664                 }
 665         }
 666
 667         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 668         {
 669                 // check if its our metadata key, and its associated with a user
 670                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 671                 {
 672                         userrec* dest = (userrec*)target;
 673                         // if they dont already have an ssl flag, accept the remote server's
 674                         if (!dest->GetExt(extname, dummy))
 675                         {
 676                                 dest->Extend(extname, "ON");
 677                         }
 678                 }
 679         }
 680
 681         bool Handshake(issl_session* session)
 682         {
 683                 int ret;
 684
 685                 if (session->outbound)
 686                         ret = SSL_connect(session->sess);
 687                 else
 688                         ret = SSL_accept(session->sess);
 689
 690                 if (ret < 0)
 691                 {
 692                         int err = SSL_get_error(session->sess, ret);
 693
 694                         if (err == SSL_ERROR_WANT_READ)
 695                         {
 696                                 session->rstat = ISSL_READ;
 697                                 session->status = ISSL_HANDSHAKING;
 698                         }
 699                         else if (err == SSL_ERROR_WANT_WRITE)
 700                         {
 701                                 session->wstat = ISSL_WRITE;
 702                                 session->status = ISSL_HANDSHAKING;
 703                                 MakePollWrite(session);
 704                         }
 705                         else
 706                         {
 707                                 CloseSession(session);
 708                         }
 709
 710                         return false;
 711                 }
 712                 else if (ret > 0)
 713                 {
 714                         // Handshake complete.
 715                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 716                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 717                         if (u)
 718                         {
 719                                 if (!u->GetExt("ssl", dummy))
 720                                         u->Extend("ssl", "ON");
 721                         }
 722
 723                         session->status = ISSL_OPEN;
 724
 725                         MakePollWrite(session);
 726
 727                         return true;
 728                 }
 729                 else if (ret == 0)
 730                 {
 731                         CloseSession(session);
 732                         return true;
 733                 }
 734
 735                 return true;
 736         }
 737
 738         virtual void OnPostConnect(userrec* user)
 739         {
 740                 // This occurs AFTER OnUserConnect so we can be sure the
 741                 // protocol module has propogated the NICK message.
 742                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 743                 {
 744                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 745                         std::deque<std::string>* metadata = new std::deque<std::string>;
 746                         metadata->push_back(user->nick);
 747                         metadata->push_back("ssl");             // The metadata id
 748                         metadata->push_back("ON");              // The value to send
 749                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 750                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 751                         DELETE(event);
 752                         DELETE(metadata);
 753
 754                         VerifyCertificate(&sessions[user->GetFd()], user);
 755                         if (sessions[user->GetFd()].sess)
 756                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 757                 }
 758         }
 759
 760         void MakePollWrite(issl_session* session)
 761         {
 762                 OnRawSocketWrite(session->fd, NULL, 0);
 763         }
 764
 765         void CloseSession(issl_session* session)
 766         {
 767                 if (session->sess)
 768                 {
 769                         SSL_shutdown(session->sess);
 770                         SSL_free(session->sess);
 771                 }
 772
 773                 if (session->inbuf)
 774                 {
 775                         delete[] session->inbuf;
 776                 }
 777
 778                 session->outbuf.clear();
 779                 session->inbuf = NULL;
 780                 session->sess = NULL;
 781                 session->status = ISSL_NONE;
 782         }
 783
 784         void VerifyCertificate(issl_session* session, Extensible* user)
 785         {
 786                 if (!session->sess || !user)
 787                         return;
 788
 789                 X509* cert;
 790                 ssl_cert* certinfo = new ssl_cert;
 791                 unsigned int n;
 792                 unsigned char md[EVP_MAX_MD_SIZE];
 793                 const EVP_MD *digest = EVP_md5();
 794
 795                 user->Extend("ssl_cert",certinfo);
 796
 797                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 798
 799                 if (!cert)
 800                 {
 801                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 802                         return;
 803                 }
 804
 805                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 806
 807                 if (SelfSigned)
 808                 {
 809                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 810                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 811                 }
 812                 else
 813                 {
 814                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 815                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 816                 }
 817
 818                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 819                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 820
 821                 if (!X509_digest(cert, digest, md, &n))
 822                 {
 823                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 824                 }
 825                 else
 826                 {
 827                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 828                 }
 829
 830                 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))
 831                 {
 832                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 833                 }
 834
 835                 X509_free(cert);
 836         }
 837 };
 838
 839 static int error_callback(const char *str, size_t len, void *u)
 840 {
 841         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 842         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 843         return 0;
 844 }
 845
 846 MODULE_INIT(ModuleSSLOpenSSL);
 847