src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #include <openssl/ssl.h>
  17 #include <openssl/err.h>
  18
  19 #include "configreader.h"
  20 #include "users.h"
  21 #include "channels.h"
  22 #include "modules.h"
  23
  24 #include "socket.h"
  25 #include "hashcomp.h"
  26
  27 #include "transport.h"
  28
  29 #ifdef WINDOWS
  30 #pragma comment(lib, "libeay32MTd")
  31 #pragma comment(lib, "ssleay32MTd")
  32 #undef MAX_DESCRIPTORS
  33 #define MAX_DESCRIPTORS 10000
  34 #endif
  35
  36 /* $ModDesc: Provides SSL support for clients */
  37 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  38 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  39 /* $ModDep: transport.h */
  40 /* $NoPedantic */
  41 /* $CopyInstall: conf/key.pem $(CONPATH) */
  42 /* $CopyInstall: conf/cert.pem $(CONPATH) */
  43
  44 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  45 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  46
  47 static bool SelfSigned = false;
  48
  49 bool isin(const std::string &host, int port, const std::vector<std::string> &portlist)
  50 {
  51         if (std::find(portlist.begin(), portlist.end(), "*:" + ConvToStr(port)) != portlist.end())
  52                 return true;
  53
  54         if (std::find(portlist.begin(), portlist.end(), ":" + ConvToStr(port)) != portlist.end())
  55                 return true;
  56
  57         return std::find(portlist.begin(), portlist.end(), host + ":" + ConvToStr(port)) != portlist.end();
  58 }
  59
  60 char* get_error()
  61 {
  62         return ERR_error_string(ERR_get_error(), NULL);
  63 }
  64
  65 static int error_callback(const char *str, size_t len, void *u);
  66
  67 /** Represents an SSL user's extra data
  68  */
  69 class issl_session : public classbase
  70 {
  71 public:
  72         SSL* sess;
  73         issl_status status;
  74         issl_io_status rstat;
  75         issl_io_status wstat;
  76
  77         unsigned int inbufoffset;
  78         char* inbuf;                    // Buffer OpenSSL reads into.
  79         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  80         int fd;
  81         bool outbound;
  82
  83         issl_session()
  84         {
  85                 outbound = false;
  86                 rstat = ISSL_READ;
  87                 wstat = ISSL_WRITE;
  88         }
  89 };
  90
  91 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  92 {
  93         /* XXX: This will allow self signed certificates.
  94          * In the future if we want an option to not allow this,
  95          * we can just return preverify_ok here, and openssl
  96          * will boot off self-signed and invalid peer certs.
  97          */
  98         int ve = X509_STORE_CTX_get_error(ctx);
  99
 100         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 101
 102         return 1;
 103 }
 104
 105 class ModuleSSLOpenSSL : public Module
 106 {
 107         std::vector<std::string> listenports;
 108
 109         int inbufsize;
 110         issl_session* sessions;
 111
 112         SSL_CTX* ctx;
 113         SSL_CTX* clictx;
 114
 115         char* dummy;
 116         char cipher[MAXBUF];
 117
 118         std::string keyfile;
 119         std::string certfile;
 120         std::string cafile;
 121         // std::string crlfile;
 122         std::string dhfile;
 123         std::string sslports;
 124
 125         int clientactive;
 126
 127  public:
 128
 129         InspIRCd* PublicInstance;
 130
 131         ModuleSSLOpenSSL(InspIRCd* Me)
 132         : Module(Me), PublicInstance(Me)
 133         {
 134                 ServerInstance->Modules->PublishInterface("BufferedSocketHook", this);
 135
 136                 sessions = new issl_session[ServerInstance->SE->GetMaxFds()];
 137
 138                 // Not rehashable...because I cba to reduce all the sizes of existing buffers.
 139                 inbufsize = ServerInstance->Config->NetBufferSize;
 140
 141                 /* Global SSL library initialization*/
 142                 SSL_library_init();
 143                 SSL_load_error_strings();
 144
 145                 /* Build our SSL contexts:
 146                  * NOTE: OpenSSL makes us have two contexts, one for servers and one for clients. ICK.
 147                  */
 148                 ctx = SSL_CTX_new( SSLv23_server_method() );
 149                 clictx = SSL_CTX_new( SSLv23_client_method() );
 150
 151                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 152                 SSL_CTX_set_verify(clictx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
 153
 154                 // Needs the flag as it ignores a plain /rehash
 155                 OnRehash(NULL,"ssl");
 156                 Implementation eventlist[] = { I_OnRawSocketConnect, I_OnRawSocketAccept, I_OnRawSocketClose, I_OnRawSocketRead, I_OnRawSocketWrite, I_OnCleanup, I_On005Numeric,
 157                         I_OnBufferFlushed, I_OnRequest, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUnloadModule, I_OnRehash, I_OnWhois, I_OnPostConnect, I_OnHookUserIO };
 158                 ServerInstance->Modules->Attach(eventlist, this, 16);
 159         }
 160
 161         virtual void OnHookUserIO(User* user, const std::string &targetip)
 162         {
 163                 if (!user->io && isin(targetip,user->GetPort(), listenports))
 164                 {
 165                         /* Hook the user with our module */
 166                         user->io = this;
 167                 }
 168         }
 169
 170         virtual void OnRehash(User* user, const std::string &param)
 171         {
 172                 ConfigReader Conf(ServerInstance);
 173
 174                 listenports.clear();
 175                 clientactive = 0;
 176                 sslports.clear();
 177
 178                 for(int index = 0; index < Conf.Enumerate("bind"); index++)
 179                 {
 180                         // For each <bind> tag
 181                         std::string x = Conf.ReadValue("bind", "type", index);
 182                         if(((x.empty()) || (x == "clients")) && (Conf.ReadValue("bind", "ssl", index) == "openssl"))
 183                         {
 184                                 // Get the port we're meant to be listening on with SSL
 185                                 std::string port = Conf.ReadValue("bind", "port", index);
 186                                 std::string addr = Conf.ReadValue("bind", "address", index);
 187
 188                                 irc::portparser portrange(port, false);
 189                                 long portno = -1;
 190                                 while ((portno = portrange.GetToken()))
 191                                 {
 192                                         clientactive++;
 193                                         try
 194                                         {
 195                                                 listenports.push_back(addr + ":" + ConvToStr(portno));
 196
 197                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 198                                                         if ((ServerInstance->Config->ports[i]->GetPort() == portno) && (ServerInstance->Config->ports[i]->GetIP() == addr))
 199                                                                 ServerInstance->Config->ports[i]->SetDescription("ssl");
 200                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_gnutls.so: Enabling SSL for port %ld", portno);
 201
 202                                                 sslports.append((addr.empty() ? "*" : addr)).append(":").append(ConvToStr(portno)).append(";");
 203                                         }
 204                                         catch (ModuleException &e)
 205                                         {
 206                                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_gnutls.so: FAILED to enable SSL on port %ld: %s. Maybe it's already hooked by the same port on a different IP, or you have an other SSL or similar module loaded?", portno, e.GetReason());
 207                                         }
 208                                 }
 209                         }
 210                 }
 211
 212                 if (!sslports.empty())
 213                         sslports.erase(sslports.end() - 1);
 214
 215                 if (param != "ssl")
 216                 {
 217                         return;
 218                 }
 219
 220                 std::string confdir(ServerInstance->ConfigFileName);
 221                 // +1 so we the path ends with a /
 222                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 223
 224                 cafile   = Conf.ReadValue("openssl", "cafile", 0);
 225                 certfile = Conf.ReadValue("openssl", "certfile", 0);
 226                 keyfile  = Conf.ReadValue("openssl", "keyfile", 0);
 227                 dhfile   = Conf.ReadValue("openssl", "dhfile", 0);
 228
 229                 // Set all the default values needed.
 230                 if (cafile.empty())
 231                         cafile = "ca.pem";
 232
 233                 if (certfile.empty())
 234                         certfile = "cert.pem";
 235
 236                 if (keyfile.empty())
 237                         keyfile = "key.pem";
 238
 239                 if (dhfile.empty())
 240                         dhfile = "dhparams.pem";
 241
 242                 // Prepend relative paths with the path to the config directory.
 243                 if (cafile[0] != '/')
 244                         cafile = confdir + cafile;
 245
 246                 if (certfile[0] != '/')
 247                         certfile = confdir + certfile;
 248
 249                 if (keyfile[0] != '/')
 250                         keyfile = confdir + keyfile;
 251
 252                 if (dhfile[0] != '/')
 253                         dhfile = confdir + dhfile;
 254
 255                 /* Load our keys and certificates
 256                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 257                  */
 258                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 259                 {
 260                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 261                         ERR_print_errors_cb(error_callback, this);
 262                 }
 263
 264                 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)))
 265                 {
 266                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 267                         ERR_print_errors_cb(error_callback, this);
 268                 }
 269
 270                 /* Load the CAs we trust*/
 271                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 272                 {
 273                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 274                         ERR_print_errors_cb(error_callback, this);
 275                 }
 276
 277                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 278                 DH* ret;
 279
 280                 if (dhpfile == NULL)
 281                 {
 282                         ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 283                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 284                 }
 285                 else
 286                 {
 287                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 288                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 289                         {
 290                                 ServerInstance->Logs->Log("m_ssl_openssl",DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 291                                 ERR_print_errors_cb(error_callback, this);
 292                         }
 293                 }
 294
 295                 fclose(dhpfile);
 296         }
 297
 298         virtual void On005Numeric(std::string &output)
 299         {
 300                 output.append(" SSL=" + sslports);
 301         }
 302
 303         virtual ~ModuleSSLOpenSSL()
 304         {
 305                 SSL_CTX_free(ctx);
 306                 SSL_CTX_free(clictx);
 307                 ServerInstance->Modules->UnpublishInterface("BufferedSocketHook", this);
 308                 delete[] sessions;
 309         }
 310
 311         virtual void OnCleanup(int target_type, void* item)
 312         {
 313                 if (target_type == TYPE_USER)
 314                 {
 315                         User* user = (User*)item;
 316
 317                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && user->io == this)
 318                         {
 319                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 320                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 321                                 User::QuitUser(ServerInstance, user, "SSL module unloading");
 322                         }
 323                         if (user->GetExt("ssl_cert", dummy))
 324                         {
 325                                 ssl_cert* tofree;
 326                                 user->GetExt("ssl_cert", tofree);
 327                                 delete tofree;
 328                                 user->Shrink("ssl_cert");
 329                         }
 330
 331                         user->io = NULL;
 332                 }
 333         }
 334
 335         virtual void OnUnloadModule(Module* mod, const std::string &name)
 336         {
 337                 if (mod == this)
 338                 {
 339                         for(unsigned int i = 0; i < listenports.size(); i++)
 340                         {
 341                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 342                                         if (listenports[i] == (ServerInstance->Config->ports[j]->GetIP()+":"+ConvToStr(ServerInstance->Config->ports[j]->GetPort())))
 343                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 344                         }
 345                 }
 346         }
 347
 348         virtual Version GetVersion()
 349         {
 350                 return Version(1, 2, 0, 0, VF_VENDOR, API_VERSION);
 351         }
 352
 353
 354         virtual const char* OnRequest(Request* request)
 355         {
 356                 ISHRequest* ISR = (ISHRequest*)request;
 357                 if (strcmp("IS_NAME", request->GetId()) == 0)
 358                 {
 359                         return "openssl";
 360                 }
 361                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 362                 {
 363                         const char* ret = "OK";
 364                         try
 365                         {
 366                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (BufferedSocket*)ISR->Sock) ? "OK" : NULL;
 367                         }
 368                         catch (ModuleException &e)
 369                         {
 370                                 return NULL;
 371                         }
 372
 373                         return ret;
 374                 }
 375                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 376                 {
 377                         return ServerInstance->Config->DelIOHook((BufferedSocket*)ISR->Sock) ? "OK" : NULL;
 378                 }
 379                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 380                 {
 381                         if (ISR->Sock->GetFd() < 0)
 382                                 return "OK";
 383
 384                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 385                         return (session->status == ISSL_HANDSHAKING) ? NULL : "OK";
 386                 }
 387                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 388                 {
 389                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 390                         if (session->sess)
 391                         {
 392                                 VerifyCertificate(session, (BufferedSocket*)ISR->Sock);
 393                                 return "OK";
 394                         }
 395                 }
 396                 return NULL;
 397         }
 398
 399
 400         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 401         {
 402                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 403                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 404                         return;
 405
 406                 issl_session* session = &sessions[fd];
 407
 408                 session->fd = fd;
 409                 session->inbuf = new char[inbufsize];
 410                 session->inbufoffset = 0;
 411                 session->sess = SSL_new(ctx);
 412                 session->status = ISSL_NONE;
 413                 session->outbound = false;
 414
 415                 if (session->sess == NULL)
 416                         return;
 417
 418                 if (SSL_set_fd(session->sess, fd) == 0)
 419                 {
 420                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 421                         return;
 422                 }
 423
 424                 Handshake(session);
 425         }
 426
 427         virtual void OnRawSocketConnect(int fd)
 428         {
 429                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 430                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() -1))
 431                         return;
 432
 433                 issl_session* session = &sessions[fd];
 434
 435                 session->fd = fd;
 436                 session->inbuf = new char[inbufsize];
 437                 session->inbufoffset = 0;
 438                 session->sess = SSL_new(clictx);
 439                 session->status = ISSL_NONE;
 440                 session->outbound = true;
 441
 442                 if (session->sess == NULL)
 443                         return;
 444
 445                 if (SSL_set_fd(session->sess, fd) == 0)
 446                 {
 447                         ServerInstance->Logs->Log("m_ssl_openssl",DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 448                         return;
 449                 }
 450
 451                 Handshake(session);
 452         }
 453
 454         virtual void OnRawSocketClose(int fd)
 455         {
 456                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 457                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 458                         return;
 459
 460                 CloseSession(&sessions[fd]);
 461
 462                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 463
 464                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 465                 {
 466                         ssl_cert* tofree;
 467                         user->GetExt("ssl_cert", tofree);
 468                         delete tofree;
 469                         user->Shrink("ssl_cert");
 470                 }
 471         }
 472
 473         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 474         {
 475                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 476                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 477                         return 0;
 478
 479                 issl_session* session = &sessions[fd];
 480
 481                 if (!session->sess)
 482                 {
 483                         readresult = 0;
 484                         CloseSession(session);
 485                         return 1;
 486                 }
 487
 488                 if (session->status == ISSL_HANDSHAKING)
 489                 {
 490                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 491                         {
 492                                 // The handshake isn't finished and it wants to read, try to finish it.
 493                                 if (!Handshake(session))
 494                                 {
 495                                         // Couldn't resume handshake.
 496                                         return -1;
 497                                 }
 498                         }
 499                         else
 500                         {
 501                                 errno = EAGAIN;
 502                                 return -1;
 503                         }
 504                 }
 505
 506                 // If we resumed the handshake then session->status will be ISSL_OPEN
 507
 508                 if (session->status == ISSL_OPEN)
 509                 {
 510                         if (session->wstat == ISSL_READ)
 511                         {
 512                                 if(DoWrite(session) == 0)
 513                                         return 0;
 514                         }
 515
 516                         if (session->rstat == ISSL_READ)
 517                         {
 518                                 int ret = DoRead(session);
 519
 520                                 if (ret > 0)
 521                                 {
 522                                         if (count <= session->inbufoffset)
 523                                         {
 524                                                 memcpy(buffer, session->inbuf, count);
 525                                                 // Move the stuff left in inbuf to the beginning of it
 526                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 527                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 528                                                 session->inbufoffset -= count;
 529                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 530                                                 readresult = count;
 531                                         }
 532                                         else
 533                                         {
 534                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 535                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 536
 537                                                 readresult = session->inbufoffset;
 538                                                 // Zero the offset, as there's nothing there..
 539                                                 session->inbufoffset = 0;
 540                                         }
 541                                         return 1;
 542                                 }
 543                                 return ret;
 544                         }
 545                 }
 546
 547                 return -1;
 548         }
 549
 550         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 551         {
 552                 /* Are there any possibilities of an out of range fd? Hope not, but lets be paranoid */
 553                 if ((fd < 0) || (fd > ServerInstance->SE->GetMaxFds() - 1))
 554                         return 0;
 555
 556                 issl_session* session = &sessions[fd];
 557
 558                 if (!session->sess)
 559                 {
 560                         CloseSession(session);
 561                         return -1;
 562                 }
 563
 564                 session->outbuf.append(buffer, count);
 565                 MakePollWrite(session);
 566
 567                 if (session->status == ISSL_HANDSHAKING)
 568                 {
 569                         // The handshake isn't finished, try to finish it.
 570                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 571                         {
 572                                 Handshake(session);
 573                         }
 574                 }
 575
 576                 if (session->status == ISSL_OPEN)
 577                 {
 578                         if (session->rstat == ISSL_WRITE)
 579                         {
 580                                 DoRead(session);
 581                         }
 582
 583                         if (session->wstat == ISSL_WRITE)
 584                         {
 585                                 return DoWrite(session);
 586                         }
 587                 }
 588
 589                 return 1;
 590         }
 591
 592         int DoWrite(issl_session* session)
 593         {
 594                 if (!session->outbuf.size())
 595                         return -1;
 596
 597                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 598
 599                 if (ret == 0)
 600                 {
 601                         CloseSession(session);
 602                         return 0;
 603                 }
 604                 else if (ret < 0)
 605                 {
 606                         int err = SSL_get_error(session->sess, ret);
 607
 608                         if (err == SSL_ERROR_WANT_WRITE)
 609                         {
 610                                 session->wstat = ISSL_WRITE;
 611                                 return -1;
 612                         }
 613                         else if (err == SSL_ERROR_WANT_READ)
 614                         {
 615                                 session->wstat = ISSL_READ;
 616                                 return -1;
 617                         }
 618                         else
 619                         {
 620                                 CloseSession(session);
 621                                 return 0;
 622                         }
 623                 }
 624                 else
 625                 {
 626                         session->outbuf = session->outbuf.substr(ret);
 627                         return ret;
 628                 }
 629         }
 630
 631         int DoRead(issl_session* session)
 632         {
 633                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 634                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 635
 636                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 637
 638                 if (ret == 0)
 639                 {
 640                         // Client closed connection.
 641                         CloseSession(session);
 642                         return 0;
 643                 }
 644                 else if (ret < 0)
 645                 {
 646                         int err = SSL_get_error(session->sess, ret);
 647
 648                         if (err == SSL_ERROR_WANT_READ)
 649                         {
 650                                 session->rstat = ISSL_READ;
 651                                 return -1;
 652                         }
 653                         else if (err == SSL_ERROR_WANT_WRITE)
 654                         {
 655                                 session->rstat = ISSL_WRITE;
 656                                 MakePollWrite(session);
 657                                 return -1;
 658                         }
 659                         else
 660                         {
 661                                 CloseSession(session);
 662                                 return 0;
 663                         }
 664                 }
 665                 else
 666                 {
 667                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 668                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 669                         // 'buffer' is 'count' long
 670
 671                         session->inbufoffset += ret;
 672
 673                         return ret;
 674                 }
 675         }
 676
 677         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 678         virtual void OnWhois(User* source, User* dest)
 679         {
 680                 if (!clientactive)
 681                         return;
 682
 683                 // Bugfix, only send this numeric for *our* SSL users
 684                 if (dest->GetExt("ssl", dummy) || ((IS_LOCAL(dest) && dest->io == this)))
 685                 {
 686                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 687                 }
 688         }
 689
 690         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 691         {
 692                 // check if the linking module wants to know about OUR metadata
 693                 if (extname == "ssl")
 694                 {
 695                         // check if this user has an swhois field to send
 696                         if(user->GetExt(extname, dummy))
 697                         {
 698                                 // call this function in the linking module, let it format the data how it
 699                                 // sees fit, and send it on its way. We dont need or want to know how.
 700                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 701                         }
 702                 }
 703         }
 704
 705         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 706         {
 707                 // check if its our metadata key, and its associated with a user
 708                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 709                 {
 710                         User* dest = (User*)target;
 711                         // if they dont already have an ssl flag, accept the remote server's
 712                         if (!dest->GetExt(extname, dummy))
 713                         {
 714                                 dest->Extend(extname, "ON");
 715                         }
 716                 }
 717         }
 718
 719         bool Handshake(issl_session* session)
 720         {
 721                 int ret;
 722
 723                 if (session->outbound)
 724                         ret = SSL_connect(session->sess);
 725                 else
 726                         ret = SSL_accept(session->sess);
 727
 728                 if (ret < 0)
 729                 {
 730                         int err = SSL_get_error(session->sess, ret);
 731
 732                         if (err == SSL_ERROR_WANT_READ)
 733                         {
 734                                 session->rstat = ISSL_READ;
 735                                 session->status = ISSL_HANDSHAKING;
 736                                 return true;
 737                         }
 738                         else if (err == SSL_ERROR_WANT_WRITE)
 739                         {
 740                                 session->wstat = ISSL_WRITE;
 741                                 session->status = ISSL_HANDSHAKING;
 742                                 MakePollWrite(session);
 743                                 return true;
 744                         }
 745                         else
 746                         {
 747                                 CloseSession(session);
 748                         }
 749
 750                         return false;
 751                 }
 752                 else if (ret > 0)
 753                 {
 754                         // Handshake complete.
 755                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 756                         User* u = ServerInstance->FindDescriptor(session->fd);
 757                         if (u)
 758                         {
 759                                 if (!u->GetExt("ssl", dummy))
 760                                         u->Extend("ssl", "ON");
 761                         }
 762
 763                         session->status = ISSL_OPEN;
 764
 765                         MakePollWrite(session);
 766
 767                         return true;
 768                 }
 769                 else if (ret == 0)
 770                 {
 771                         CloseSession(session);
 772                         return true;
 773                 }
 774
 775                 return true;
 776         }
 777
 778         virtual void OnPostConnect(User* user)
 779         {
 780                 // This occurs AFTER OnUserConnect so we can be sure the
 781                 // protocol module has propagated the NICK message.
 782                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 783                 {
 784                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 785                         std::deque<std::string>* metadata = new std::deque<std::string>;
 786                         metadata->push_back(user->uuid);
 787                         metadata->push_back("ssl");             // The metadata id
 788                         metadata->push_back("ON");              // The value to send
 789                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 790                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 791                         delete event;
 792                         delete metadata;
 793
 794                         VerifyCertificate(&sessions[user->GetFd()], user);
 795                         if (sessions[user->GetFd()].sess)
 796                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 797                 }
 798         }
 799
 800         void MakePollWrite(issl_session* session)
 801         {
 802                 //OnRawSocketWrite(session->fd, NULL, 0);
 803                 EventHandler* eh = ServerInstance->FindDescriptor(session->fd);
 804                 if (eh)
 805                 {
 806                         ServerInstance->SE->WantWrite(eh);
 807                 }
 808         }
 809
 810         virtual void OnBufferFlushed(User* user)
 811         {
 812                 if (user->GetExt("ssl"))
 813                 {
 814                         issl_session* session = &sessions[user->GetFd()];
 815                         if (session && session->outbuf.size())
 816                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 817                 }
 818         }
 819
 820         void CloseSession(issl_session* session)
 821         {
 822                 if (session->sess)
 823                 {
 824                         SSL_shutdown(session->sess);
 825                         SSL_free(session->sess);
 826                 }
 827
 828                 if (session->inbuf)
 829                 {
 830                         delete[] session->inbuf;
 831                 }
 832
 833                 session->outbuf.clear();
 834                 session->inbuf = NULL;
 835                 session->sess = NULL;
 836                 session->status = ISSL_NONE;
 837         }
 838
 839         void VerifyCertificate(issl_session* session, Extensible* user)
 840         {
 841                 if (!session->sess || !user)
 842                         return;
 843
 844                 X509* cert;
 845                 ssl_cert* certinfo = new ssl_cert;
 846                 unsigned int n;
 847                 unsigned char md[EVP_MAX_MD_SIZE];
 848                 const EVP_MD *digest = EVP_md5();
 849
 850                 user->Extend("ssl_cert",certinfo);
 851
 852                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 853
 854                 if (!cert)
 855                 {
 856                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 857                         return;
 858                 }
 859
 860                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 861
 862                 if (SelfSigned)
 863                 {
 864                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 865                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 866                 }
 867                 else
 868                 {
 869                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 870                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 871                 }
 872
 873                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 874                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 875
 876                 if (!X509_digest(cert, digest, md, &n))
 877                 {
 878                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 879                 }
 880                 else
 881                 {
 882                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 883                 }
 884
 885                 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))
 886                 {
 887                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 888                 }
 889
 890                 X509_free(cert);
 891         }
 892
 893         void Prioritize()
 894         {
 895                 Module* server = ServerInstance->Modules->Find("m_spanningtree.so");
 896                 ServerInstance->Modules->SetPriority(this, I_OnPostConnect, PRIO_AFTER, &server);
 897         }
 898
 899 };
 900
 901 static int error_callback(const char *str, size_t len, void *u)
 902 {
 903         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 904         mssl->PublicInstance->Logs->Log("m_ssl_openssl",DEFAULT, "SSL error: " + std::string(str, len - 1));
 905         return 0;
 906 }
 907
 908 MODULE_INIT(ModuleSSLOpenSSL)