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