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         std::vector<int> listenports;
 107
 108         int inbufsize;
 109         issl_session sessions[MAX_DESCRIPTORS];
 110
 111         SSL_CTX* ctx;
 112         SSL_CTX* clictx;
 113
 114         char* dummy;
 115         char cipher[MAXBUF];
 116
 117         std::string keyfile;
 118         std::string certfile;
 119         std::string cafile;
 120         // std::string crlfile;
 121         std::string dhfile;
 122         std::string sslports;
 123
 124         int clientactive;
 125
 126  public:
 127
 128         InspIRCd* PublicInstance;
 129
 130         ModuleSSLOpenSSL(InspIRCd* Me)
 131         : Module(Me), PublicInstance(Me)
 132         {
 133                 ServerInstance->Modules->PublishInterface("InspSocketHook", this);
 134
 135                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 136                 inbufsize = ServerInstance->Config->NetBufferSize;
 137
 138                 /* Global SSL library initialization*/
 139                 SSL_library_init();
 140                 SSL_load_error_strings();
 141
 142                 /* Build our SSL contexts:
 143                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 144                  */
 145                 ctx = SSL_CTX_new( SSLv23_server_method() );
 146                 clictx = SSL_CTX_new( SSLv23_client_method() );
 147
 148                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 149                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 150
 151                 // Needs the flag as it ignores a plain /rehash
 152                 OnRehash(NULL,"ssl");
 153         }
 154
 155         virtual void OnRehash(userrec* user, const std::string &param)
 156         {
 157                 if (param != "ssl")
 158                         return;
 159
 160                 ConfigReader Conf(ServerInstance);
 161
 162                 for (unsigned int i = 0; i < listenports.size(); i++)
 163                 {
 164                         ServerInstance->Config->DelIOHook(listenports[i]);
 165                 }
 166
 167                 listenports.clear();
 168                 clientactive = 0;
 169                 sslports.clear();
 170
 171                 for (int i = 0; i < Conf.Enumerate("bind"); i++)
 172                 {
 173                         // For each <bind> tag
 174                         std::string x = Conf.ReadValue("bind", "type", i);
 175                         if (((x.empty()) || (x == "clients")) && (Conf.ReadValue("bind", "ssl", i) == "openssl"))
 176                         {
 177                                 // Get the port we're meant to be listening on with SSL
 178                                 std::string port = Conf.ReadValue("bind", "port", i);
 179                                 irc::portparser portrange(port, false);
 180                                 long portno = -1;
 181                                 while ((portno = portrange.GetToken()))
 182                                 {
 183                                         clientactive++;
 184                                         try
 185                                         {
 186                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 187                                                 {
 188                                                         listenports.push_back(portno);
 189                                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 190                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 191                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 192                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 193                                                         sslports.append("*:").append(ConvToStr(portno)).append(";");
 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                 if (!sslports.empty())
 209                         sslports.erase(sslports.end() - 1);
 210
 211                 std::string confdir(ServerInstance->ConfigFileName);
 212                 // +1 so we the path ends with a /
 213                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 214
 215                 cafile   = Conf.ReadValue("openssl", "cafile", 0);
 216                 certfile = Conf.ReadValue("openssl", "certfile", 0);
 217                 keyfile  = Conf.ReadValue("openssl", "keyfile", 0);
 218                 dhfile   = Conf.ReadValue("openssl", "dhfile", 0);
 219
 220                 // Set all the default values needed.
 221                 if (cafile.empty())
 222                         cafile = "ca.pem";
 223
 224                 if (certfile.empty())
 225                         certfile = "cert.pem";
 226
 227                 if (keyfile.empty())
 228                         keyfile = "key.pem";
 229
 230                 if (dhfile.empty())
 231                         dhfile = "dhparams.pem";
 232
 233                 // Prepend relative paths with the path to the config directory.
 234                 if (cafile[0] != '/')
 235                         cafile = confdir + cafile;
 236
 237                 if (certfile[0] != '/')
 238                         certfile = confdir + certfile;
 239
 240                 if (keyfile[0] != '/')
 241                         keyfile = confdir + keyfile;
 242
 243                 if (dhfile[0] != '/')
 244                         dhfile = confdir + dhfile;
 245
 246                 /* Load our keys and certificates
 247                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 248                  */
 249                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 250                 {
 251                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 252                         ERR_print_errors_cb(error_callback, this);
 253                 }
 254
 255                 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)))
 256                 {
 257                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 258                         ERR_print_errors_cb(error_callback, this);
 259                 }
 260
 261                 /* Load the CAs we trust*/
 262                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 263                 {
 264                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 265                         ERR_print_errors_cb(error_callback, this);
 266                 }
 267
 268                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 269                 DH* ret;
 270
 271                 if (dhpfile == NULL)
 272                 {
 273                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 274                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 275                 }
 276                 else
 277                 {
 278                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 279                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 280                         {
 281                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 282                                 ERR_print_errors_cb(error_callback, this);
 283                         }
 284                 }
 285
 286                 fclose(dhpfile);
 287         }
 288
 289         virtual void On005Numeric(std::string &output)
 290         {
 291                 output.append(" SSL=" + sslports);
 292         }
 293
 294         virtual ~ModuleSSLOpenSSL()
 295         {
 296                 SSL_CTX_free(ctx);
 297                 SSL_CTX_free(clictx);
 298         }
 299
 300         virtual void OnCleanup(int target_type, void* item)
 301         {
 302                 if (target_type == TYPE_USER)
 303                 {
 304                         userrec* user = (userrec*)item;
 305
 306                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 307                         {
 308                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 309                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 310                                 userrec::QuitUser(ServerInstance, user, "SSL module unloading");
 311                         }
 312                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 313                         {
 314                                 ssl_cert* tofree;
 315                                 user->GetExt("ssl_cert", tofree);
 316                                 delete tofree;
 317                                 user->Shrink("ssl_cert");
 318                         }
 319                 }
 320         }
 321
 322         virtual void OnUnloadModule(Module* mod, const std::string &name)
 323         {
 324                 if (mod == this)
 325                 {
 326                         for(unsigned int i = 0; i < listenports.size(); i++)
 327                         {
 328                                 ServerInstance->Config->DelIOHook(listenports[i]);
 329                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 330                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 331                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 332                         }
 333                 }
 334         }
 335
 336         virtual Version GetVersion()
 337         {
 338                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 339         }
 340
 341         void Implements(char* List)
 342         {
 343                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = List[I_On005Numeric] = 1;
 344                 List[I_OnBufferFlushed] = List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 345         }
 346
 347         virtual char* OnRequest(Request* request)
 348         {
 349                 ISHRequest* ISR = (ISHRequest*)request;
 350                 if (strcmp("IS_NAME", request->GetId()) == 0)
 351                 {
 352                         return "openssl";
 353                 }
 354                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 355                 {
 356                         char* ret = "OK";
 357                         try
 358                         {
 359                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 360                         }
 361                         catch (ModuleException &e)
 362                         {
 363                                 return NULL;
 364                         }
 365
 366                         return ret;
 367                 }
 368                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 369                 {
 370                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 371                 }
 372                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 373                 {
 374                         if (ISR->Sock->GetFd() < 0)
 375                                 return (char*)"OK";
 376
 377                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 378                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 379                 }
 380                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 381                 {
 382                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 383                         if (session->sess)
 384                         {
 385                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 386                                 return "OK";
 387                         }
 388                 }
 389                 return NULL;
 390         }
 391
 392
 393         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 394         {
 395                 issl_session* session = &sessions[fd];
 396
 397                 session->fd = fd;
 398                 session->inbuf = new char[inbufsize];
 399                 session->inbufoffset = 0;
 400                 session->sess = SSL_new(ctx);
 401                 session->status = ISSL_NONE;
 402                 session->outbound = false;
 403
 404                 if (session->sess == NULL)
 405                         return;
 406
 407                 if (SSL_set_fd(session->sess, fd) == 0)
 408                 {
 409                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 410                         return;
 411                 }
 412
 413                 Handshake(session);
 414         }
 415
 416         virtual void OnRawSocketConnect(int fd)
 417         {
 418                 issl_session* session = &sessions[fd];
 419
 420                 session->fd = fd;
 421                 session->inbuf = new char[inbufsize];
 422                 session->inbufoffset = 0;
 423                 session->sess = SSL_new(clictx);
 424                 session->status = ISSL_NONE;
 425                 session->outbound = true;
 426
 427                 if (session->sess == NULL)
 428                         return;
 429
 430                 if (SSL_set_fd(session->sess, fd) == 0)
 431                 {
 432                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 433                         return;
 434                 }
 435
 436                 Handshake(session);
 437         }
 438
 439         virtual void OnRawSocketClose(int fd)
 440         {
 441                 CloseSession(&sessions[fd]);
 442
 443                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 444
 445                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 446                 {
 447                         ssl_cert* tofree;
 448                         user->GetExt("ssl_cert", tofree);
 449                         delete tofree;
 450                         user->Shrink("ssl_cert");
 451                 }
 452         }
 453
 454         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 455         {
 456                 issl_session* session = &sessions[fd];
 457
 458                 if (!session->sess)
 459                 {
 460                         readresult = 0;
 461                         CloseSession(session);
 462                         return 1;
 463                 }
 464
 465                 if (session->status == ISSL_HANDSHAKING)
 466                 {
 467                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 468                         {
 469                                 // The handshake isn't finished and it wants to read, try to finish it.
 470                                 if (!Handshake(session))
 471                                 {
 472                                         // Couldn't resume handshake.
 473                                         return -1;
 474                                 }
 475                         }
 476                         else
 477                         {
 478                                 errno = EAGAIN;
 479                                 return -1;
 480                         }
 481                 }
 482
 483                 // If we resumed the handshake then session->status will be ISSL_OPEN
 484
 485                 if (session->status == ISSL_OPEN)
 486                 {
 487                         if (session->wstat == ISSL_READ)
 488                         {
 489                                 if(DoWrite(session) == 0)
 490                                         return 0;
 491                         }
 492
 493                         if (session->rstat == ISSL_READ)
 494                         {
 495                                 int ret = DoRead(session);
 496
 497                                 ServerInstance->Log(DEBUG, "<***> DoRead count: " + ConvToStr(count));
 498                                 ServerInstance->Log(DEBUG, "<***> DoRead ret: " + ConvToStr(ret));
 499                                 ServerInstance->Log(DEBUG, "<***> DoRead session->inbufoffset: " + ConvToStr(session->inbufoffset));
 500
 501                                 if (ret > 0)
 502                                 {
 503                                         if (count <= session->inbufoffset)
 504                                         {
 505                                                 memcpy(buffer, session->inbuf, count);
 506                                                 // Move the stuff left in inbuf to the beginning of it
 507                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 508                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 509                                                 session->inbufoffset -= count;
 510                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 511                                                 readresult = count;
 512                                         }
 513                                         else
 514                                         {
 515                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 516                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 517
 518                                                 readresult = session->inbufoffset;
 519                                                 // Zero the offset, as there's nothing there..
 520                                                 session->inbufoffset = 0;
 521                                         }
 522
 523                                         return 1;
 524                                 }
 525                                 else
 526                                 {
 527                                         return ret;
 528                                 }
 529                         }
 530                 }
 531
 532                 return -1;
 533         }
 534
 535         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 536         {
 537                 issl_session* session = &sessions[fd];
 538
 539                 if (!session->sess)
 540                 {
 541                         CloseSession(session);
 542                         return -1;
 543                 }
 544
 545                 session->outbuf.append(buffer, count);
 546                 MakePollWrite(session);
 547
 548                 if (session->status == ISSL_HANDSHAKING)
 549                 {
 550                         // The handshake isn't finished, try to finish it.
 551                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 552                         {
 553                                 Handshake(session);
 554                         }
 555                 }
 556
 557                 if (session->status == ISSL_OPEN)
 558                 {
 559                         if (session->rstat == ISSL_WRITE)
 560                         {
 561                                 DoRead(session);
 562                         }
 563
 564                         if (session->wstat == ISSL_WRITE)
 565                         {
 566                                 return DoWrite(session);
 567                         }
 568                 }
 569
 570                 return 1;
 571         }
 572
 573         int DoWrite(issl_session* session)
 574         {
 575                 if (!session->outbuf.size())
 576                         return -1;
 577
 578                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 579
 580                 if (ret == 0)
 581                 {
 582                         CloseSession(session);
 583                         return 0;
 584                 }
 585                 else if (ret < 0)
 586                 {
 587                         int err = SSL_get_error(session->sess, ret);
 588
 589                         if (err == SSL_ERROR_WANT_WRITE)
 590                         {
 591                                 session->wstat = ISSL_WRITE;
 592                                 return -1;
 593                         }
 594                         else if (err == SSL_ERROR_WANT_READ)
 595                         {
 596                                 session->wstat = ISSL_READ;
 597                                 return -1;
 598                         }
 599                         else
 600                         {
 601                                 CloseSession(session);
 602                                 return 0;
 603                         }
 604                 }
 605                 else
 606                 {
 607                         session->outbuf = session->outbuf.substr(ret);
 608                         return ret;
 609                 }
 610         }
 611
 612         int DoRead(issl_session* session)
 613         {
 614                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 615                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 616
 617                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 618
 619                 if (ret == 0)
 620                 {
 621                         // Client closed connection.
 622                         CloseSession(session);
 623                         return 0;
 624                 }
 625                 else if (ret < 0)
 626                 {
 627                         int err = SSL_get_error(session->sess, ret);
 628
 629                         if (err == SSL_ERROR_WANT_READ)
 630                         {
 631                                 session->rstat = ISSL_READ;
 632                                 return -1;
 633                         }
 634                         else if (err == SSL_ERROR_WANT_WRITE)
 635                         {
 636                                 session->rstat = ISSL_WRITE;
 637                                 MakePollWrite(session);
 638                                 return -1;
 639                         }
 640                         else
 641                         {
 642                                 CloseSession(session);
 643                                 return 0;
 644                         }
 645                 }
 646                 else
 647                 {
 648                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 649                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 650                         // 'buffer' is 'count' long
 651
 652                         session->inbufoffset += ret;
 653
 654                         return ret;
 655                 }
 656         }
 657
 658         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 659         virtual void OnWhois(userrec* source, userrec* dest)
 660         {
 661                 if (!clientactive)
 662                         return;
 663
 664                 // Bugfix, only send this numeric for *our* SSL users
 665                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 666                 {
 667                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 668                 }
 669         }
 670
 671         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 672         {
 673                 // check if the linking module wants to know about OUR metadata
 674                 if (extname == "ssl")
 675                 {
 676                         // check if this user has an swhois field to send
 677                         if(user->GetExt(extname, dummy))
 678                         {
 679                                 // call this function in the linking module, let it format the data how it
 680                                 // sees fit, and send it on its way. We dont need or want to know how.
 681                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 682                         }
 683                 }
 684         }
 685
 686         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 687         {
 688                 // check if its our metadata key, and its associated with a user
 689                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 690                 {
 691                         userrec* dest = (userrec*)target;
 692                         // if they dont already have an ssl flag, accept the remote server's
 693                         if (!dest->GetExt(extname, dummy))
 694                         {
 695                                 dest->Extend(extname, "ON");
 696                         }
 697                 }
 698         }
 699
 700         bool Handshake(issl_session* session)
 701         {
 702                 int ret;
 703
 704                 if (session->outbound)
 705                 {
 706                         ret = SSL_connect(session->sess);
 707                 }
 708                 else
 709                         ret = SSL_accept(session->sess);
 710
 711                 if (ret < 0)
 712                 {
 713                         int err = SSL_get_error(session->sess, ret);
 714
 715                         if (err == SSL_ERROR_WANT_READ)
 716                         {
 717                                 session->rstat = ISSL_READ;
 718                                 session->status = ISSL_HANDSHAKING;
 719                                 return true;
 720                         }
 721                         else if (err == SSL_ERROR_WANT_WRITE)
 722                         {
 723                                 session->wstat = ISSL_WRITE;
 724                                 session->status = ISSL_HANDSHAKING;
 725                                 MakePollWrite(session);
 726                                 return true;
 727                         }
 728                         else
 729                         {
 730                                 CloseSession(session);
 731                         }
 732
 733                         return false;
 734                 }
 735                 else if (ret > 0)
 736                 {
 737                         // Handshake complete.
 738                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 739                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 740                         if (u)
 741                         {
 742                                 if (!u->GetExt("ssl", dummy))
 743                                         u->Extend("ssl", "ON");
 744                         }
 745
 746                         session->status = ISSL_OPEN;
 747
 748                         MakePollWrite(session);
 749
 750                         return true;
 751                 }
 752                 else if (ret == 0)
 753                 {
 754                         int ssl_err = SSL_get_error(session->sess, ret);
 755                         char buf[1024];
 756                         ERR_print_errors_fp(stderr);
 757                         ServerInstance->Log(DEBUG,"Handshake fail 2: %d: %s", ssl_err, ERR_error_string(ssl_err,buf));
 758                         CloseSession(session);
 759                         return true;
 760                 }
 761
 762                 return true;
 763         }
 764
 765         virtual void OnPostConnect(userrec* user)
 766         {
 767                 // This occurs AFTER OnUserConnect so we can be sure the
 768                 // protocol module has propagated the NICK message.
 769                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 770                 {
 771                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 772                         std::deque<std::string>* metadata = new std::deque<std::string>;
 773                         metadata->push_back(user->nick);
 774                         metadata->push_back("ssl");             // The metadata id
 775                         metadata->push_back("ON");              // The value to send
 776                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 777                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 778                         DELETE(event);
 779                         DELETE(metadata);
 780
 781                         VerifyCertificate(&sessions[user->GetFd()], user);
 782                         if (sessions[user->GetFd()].sess)
 783                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 784                 }
 785         }
 786
 787         void MakePollWrite(issl_session* session)
 788         {
 789                 //OnRawSocketWrite(session->fd, NULL, 0);
 790                 EventHandler* eh = ServerInstance->FindDescriptor(session->fd);
 791                 if (eh)
 792                         ServerInstance->SE->WantWrite(eh);
 793         }
 794
 795         virtual void OnBufferFlushed(userrec* user)
 796         {
 797                 if (user->GetExt("ssl"))
 798                 {
 799                         issl_session* session = &sessions[user->GetFd()];
 800                         if (session && session->outbuf.size())
 801                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 802                 }
 803         }
 804
 805         void CloseSession(issl_session* session)
 806         {
 807                 if (session->sess)
 808                 {
 809                         SSL_shutdown(session->sess);
 810                         SSL_free(session->sess);
 811                 }
 812
 813                 if (session->inbuf)
 814                 {
 815                         delete[] session->inbuf;
 816                 }
 817
 818                 session->outbuf.clear();
 819                 session->inbuf = NULL;
 820                 session->sess = NULL;
 821                 session->status = ISSL_NONE;
 822         }
 823
 824         void VerifyCertificate(issl_session* session, Extensible* user)
 825         {
 826                 if (!session->sess || !user)
 827                         return;
 828
 829                 X509* cert;
 830                 ssl_cert* certinfo = new ssl_cert;
 831                 unsigned int n;
 832                 unsigned char md[EVP_MAX_MD_SIZE];
 833                 const EVP_MD *digest = EVP_md5();
 834
 835                 user->Extend("ssl_cert",certinfo);
 836
 837                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 838
 839                 if (!cert)
 840                 {
 841                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 842                         return;
 843                 }
 844
 845                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 846
 847                 if (SelfSigned)
 848                 {
 849                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 850                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 851                 }
 852                 else
 853                 {
 854                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 855                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 856                 }
 857
 858                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 859                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 860
 861                 if (!X509_digest(cert, digest, md, &n))
 862                 {
 863                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 864                 }
 865                 else
 866                 {
 867                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 868                 }
 869
 870                 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))
 871                 {
 872                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 873                 }
 874
 875                 X509_free(cert);
 876         }
 877 };
 878
 879 static int error_callback(const char *str, size_t len, void *u)
 880 {
 881         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 882         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 883         return 0;
 884 }
 885
 886 MODULE_INIT(ModuleSSLOpenSSL);