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