src/modules/extra/m_ssl_openssl.cpp

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