src/modules/extra/m_ssl_openssl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #include <openssl/ssl.h>
  17 #include <openssl/err.h>
  18
  19 #ifdef WINDOWS
  20 #include <openssl/applink.c>
  21 #endif
  22
  23 #include "configreader.h"
  24 #include "users.h"
  25 #include "channels.h"
  26 #include "modules.h"
  27
  28 #include "socket.h"
  29 #include "hashcomp.h"
  30
  31 #include "transport.h"
  32
  33 #ifdef WINDOWS
  34 #pragma comment(lib, "libeay32MTd")
  35 #pragma comment(lib, "ssleay32MTd")
  36 #undef MAX_DESCRIPTORS
  37 #define MAX_DESCRIPTORS 10000
  38 #endif
  39
  40 /* $ModDesc: Provides SSL support for clients */
  41 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") */
  42 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto -ldl") */
  43 /* $ModDep: transport.h */
  44
  45 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
  46 enum issl_io_status { ISSL_WRITE, ISSL_READ };
  47
  48 static bool SelfSigned = false;
  49
  50 bool isin(int port, const std::vector<int> &portlist)
  51 {
  52         for(unsigned int i = 0; i < portlist.size(); i++)
  53                 if(portlist[i] == port)
  54                         return true;
  55
  56         return false;
  57 }
  58
  59 char* get_error()
  60 {
  61         return ERR_error_string(ERR_get_error(), NULL);
  62 }
  63
  64 static int error_callback(const char *str, size_t len, void *u);
  65
  66 /** Represents an SSL user's extra data
  67  */
  68 class issl_session : public classbase
  69 {
  70 public:
  71         SSL* sess;
  72         issl_status status;
  73         issl_io_status rstat;
  74         issl_io_status wstat;
  75
  76         unsigned int inbufoffset;
  77         char* inbuf;                    // Buffer OpenSSL reads into.
  78         std::string outbuf;     // Buffer for outgoing data that OpenSSL will not take.
  79         int fd;
  80         bool outbound;
  81
  82         issl_session()
  83         {
  84                 outbound = false;
  85                 rstat = ISSL_READ;
  86                 wstat = ISSL_WRITE;
  87         }
  88 };
  89
  90 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
  91 {
  92         /* XXX: This will allow self signed certificates.
  93          * In the future if we want an option to not allow this,
  94          * we can just return preverify_ok here, and openssl
  95          * will boot off self-signed and invalid peer certs.
  96          */
  97         int ve = X509_STORE_CTX_get_error(ctx);
  98
  99         SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
 100
 101         return 1;
 102 }
 103
 104 class ModuleSSLOpenSSL : public Module
 105 {
 106
 107         ConfigReader* Conf;
 108
 109         std::vector<int> listenports;
 110
 111         int inbufsize;
 112         issl_session sessions[MAX_DESCRIPTORS];
 113
 114         SSL_CTX* ctx;
 115         SSL_CTX* clictx;
 116
 117         char* dummy;
 118         char cipher[MAXBUF];
 119
 120         std::string keyfile;
 121         std::string certfile;
 122         std::string cafile;
 123         // std::string crlfile;
 124         std::string dhfile;
 125         std::string sslports;
 126
 127         int clientactive;
 128
 129  public:
 130
 131         InspIRCd* PublicInstance;
 132
 133         ModuleSSLOpenSSL(InspIRCd* Me)
 134                 : Module(Me), PublicInstance(Me)
 135         {
 136                 ServerInstance->PublishInterface("InspSocketHook", this);
 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         }
 157
 158         virtual void OnRehash(userrec* user, const std::string &param)
 159         {
 160                 if (param != "ssl")
 161                         return;
 162
 163                 Conf = new ConfigReader(ServerInstance);
 164
 165                 for (unsigned int i = 0; i < listenports.size(); i++)
 166                 {
 167                         ServerInstance->Config->DelIOHook(listenports[i]);
 168                 }
 169
 170                 listenports.clear();
 171                 clientactive = 0;
 172                 sslports.clear();
 173
 174                 for (int i = 0; i < Conf->Enumerate("bind"); i++)
 175                 {
 176                         // For each <bind> tag
 177                         std::string x = Conf->ReadValue("bind", "type", i);
 178                         if (((x.empty()) || (x == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
 179                         {
 180                                 // Get the port we're meant to be listening on with SSL
 181                                 std::string port = Conf->ReadValue("bind", "port", i);
 182                                 irc::portparser portrange(port, false);
 183                                 long portno = -1;
 184                                 while ((portno = portrange.GetToken()))
 185                                 {
 186                                         clientactive++;
 187                                         try
 188                                         {
 189                                                 if (ServerInstance->Config->AddIOHook(portno, this))
 190                                                 {
 191                                                         listenports.push_back(portno);
 192                                                                 for (size_t i = 0; i < ServerInstance->Config->ports.size(); i++)
 193                                                                 if (ServerInstance->Config->ports[i]->GetPort() == portno)
 194                                                                         ServerInstance->Config->ports[i]->SetDescription("ssl");
 195                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", portno);
 196                                                         sslports.append("*:").append(ConvToStr(portno)).append(";");
 197                                                 }
 198                                                 else
 199                                                 {
 200                                                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d, maybe you have another ssl or similar module loaded?", portno);
 201                                                 }
 202                                         }
 203                                         catch (ModuleException &e)
 204                                         {
 205                                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: FAILED to enable SSL on port %d: %s. Maybe it's already hooked by the same port on a different IP, or you have another SSL or similar module loaded?", portno, e.GetReason());
 206                                         }
 207                                 }
 208                         }
 209                 }
 210
 211                 if (!sslports.empty())
 212                         sslports.erase(sslports.end() - 1);
 213
 214                 std::string confdir(ServerInstance->ConfigFileName);
 215                 // +1 so we the path ends with a /
 216                 confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
 217
 218                 cafile   = Conf->ReadValue("openssl", "cafile", 0);
 219                 certfile = Conf->ReadValue("openssl", "certfile", 0);
 220                 keyfile  = Conf->ReadValue("openssl", "keyfile", 0);
 221                 dhfile   = Conf->ReadValue("openssl", "dhfile", 0);
 222
 223                 // Set all the default values needed.
 224                 if (cafile.empty())
 225                         cafile = "ca.pem";
 226
 227                 if (certfile.empty())
 228                         certfile = "cert.pem";
 229
 230                 if (keyfile.empty())
 231                         keyfile = "key.pem";
 232
 233                 if (dhfile.empty())
 234                         dhfile = "dhparams.pem";
 235
 236                 // Prepend relative paths with the path to the config directory.
 237                 if (cafile[0] != '/')
 238                         cafile = confdir + cafile;
 239
 240                 if (certfile[0] != '/')
 241                         certfile = confdir + certfile;
 242
 243                 if (keyfile[0] != '/')
 244                         keyfile = confdir + keyfile;
 245
 246                 if (dhfile[0] != '/')
 247                         dhfile = confdir + dhfile;
 248
 249                 /* Load our keys and certificates
 250                  * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
 251                  */
 252                 if ((!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str())) || (!SSL_CTX_use_certificate_chain_file(clictx, certfile.c_str())))
 253                 {
 254                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s. %s", certfile.c_str(), strerror(errno));
 255                         ERR_print_errors_cb(error_callback, this);
 256                 }
 257
 258                 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)))
 259                 {
 260                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s. %s", keyfile.c_str(), strerror(errno));
 261                         ERR_print_errors_cb(error_callback, this);
 262                 }
 263
 264                 /* Load the CAs we trust*/
 265                 if (((!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))) || (!SSL_CTX_load_verify_locations(clictx, cafile.c_str(), 0)))
 266                 {
 267                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from %s. %s", cafile.c_str(), strerror(errno));
 268                         ERR_print_errors_cb(error_callback, this);
 269                 }
 270
 271                 FILE* dhpfile = fopen(dhfile.c_str(), "r");
 272                 DH* ret;
 273
 274                 if (dhpfile == NULL)
 275                 {
 276                         ServerInstance->Log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
 277                         throw ModuleException("Couldn't open DH file " + dhfile + ": " + strerror(errno));
 278                 }
 279                 else
 280                 {
 281                         ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
 282                         if ((SSL_CTX_set_tmp_dh(ctx, ret) < 0) || (SSL_CTX_set_tmp_dh(clictx, ret) < 0))
 283                         {
 284                                 ServerInstance->Log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters %s. SSL errors follow:", dhfile.c_str());
 285                                 ERR_print_errors_cb(error_callback, this);
 286                         }
 287                 }
 288
 289                 fclose(dhpfile);
 290
 291                 DELETE(Conf);
 292         }
 293
 294         virtual void On005Numeric(std::string &output)
 295         {
 296                 output.append(" SSL=" + sslports);
 297         }
 298
 299         virtual ~ModuleSSLOpenSSL()
 300         {
 301                 SSL_CTX_free(ctx);
 302                 SSL_CTX_free(clictx);
 303         }
 304
 305         virtual void OnCleanup(int target_type, void* item)
 306         {
 307                 if (target_type == TYPE_USER)
 308                 {
 309                         userrec* user = (userrec*)item;
 310
 311                         if (user->GetExt("ssl", dummy) && IS_LOCAL(user) && isin(user->GetPort(), listenports))
 312                         {
 313                                 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
 314                                 // Potentially there could be multiple SSL modules loaded at once on different ports.
 315                                 userrec::QuitUser(ServerInstance, user, "SSL module unloading");
 316                         }
 317                         if (user->GetExt("ssl_cert", dummy) && isin(user->GetPort(), listenports))
 318                         {
 319                                 ssl_cert* tofree;
 320                                 user->GetExt("ssl_cert", tofree);
 321                                 delete tofree;
 322                                 user->Shrink("ssl_cert");
 323                         }
 324                 }
 325         }
 326
 327         virtual void OnUnloadModule(Module* mod, const std::string &name)
 328         {
 329                 if (mod == this)
 330                 {
 331                         for(unsigned int i = 0; i < listenports.size(); i++)
 332                         {
 333                                 ServerInstance->Config->DelIOHook(listenports[i]);
 334                                 for (size_t j = 0; j < ServerInstance->Config->ports.size(); j++)
 335                                         if (ServerInstance->Config->ports[j]->GetPort() == listenports[i])
 336                                                 ServerInstance->Config->ports[j]->SetDescription("plaintext");
 337                         }
 338                 }
 339         }
 340
 341         virtual Version GetVersion()
 342         {
 343                 return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
 344         }
 345
 346         void Implements(char* List)
 347         {
 348                 List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = List[I_On005Numeric] = 1;
 349                 List[I_OnBufferFlushed] = List[I_OnRequest] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = List[I_OnPostConnect] = 1;
 350         }
 351
 352         virtual char* OnRequest(Request* request)
 353         {
 354                 ISHRequest* ISR = (ISHRequest*)request;
 355                 if (strcmp("IS_NAME", request->GetId()) == 0)
 356                 {
 357                         return "openssl";
 358                 }
 359                 else if (strcmp("IS_HOOK", request->GetId()) == 0)
 360                 {
 361                         char* ret = "OK";
 362                         try
 363                         {
 364                                 ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 365                         }
 366                         catch (ModuleException &e)
 367                         {
 368                                 return NULL;
 369                         }
 370
 371                         return ret;
 372                 }
 373                 else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
 374                 {
 375                         return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
 376                 }
 377                 else if (strcmp("IS_HSDONE", request->GetId()) == 0)
 378                 {
 379                         ServerInstance->Log(DEBUG,"Module checking if handshake is done");
 380                         if (ISR->Sock->GetFd() < 0)
 381                                 return (char*)"OK";
 382
 383                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 384                         return (session->status == ISSL_HANDSHAKING) ? NULL : (char*)"OK";
 385                 }
 386                 else if (strcmp("IS_ATTACH", request->GetId()) == 0)
 387                 {
 388                         issl_session* session = &sessions[ISR->Sock->GetFd()];
 389                         if (session->sess)
 390                         {
 391                                 VerifyCertificate(session, (InspSocket*)ISR->Sock);
 392                                 return "OK";
 393                         }
 394                 }
 395                 return NULL;
 396         }
 397
 398
 399         virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
 400         {
 401                 issl_session* session = &sessions[fd];
 402
 403                 session->fd = fd;
 404                 session->inbuf = new char[inbufsize];
 405                 session->inbufoffset = 0;
 406                 session->sess = SSL_new(ctx);
 407                 session->status = ISSL_NONE;
 408                 session->outbound = false;
 409
 410                 if (session->sess == NULL)
 411                         return;
 412
 413                 if (SSL_set_fd(session->sess, fd) == 0)
 414                 {
 415                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 416                         return;
 417                 }
 418
 419                 Handshake(session);
 420         }
 421
 422         virtual void OnRawSocketConnect(int fd)
 423         {
 424                 issl_session* session = &sessions[fd];
 425
 426                 session->fd = fd;
 427                 session->inbuf = new char[inbufsize];
 428                 session->inbufoffset = 0;
 429                 session->sess = SSL_new(clictx);
 430                 session->status = ISSL_NONE;
 431                 session->outbound = true;
 432
 433                 if (session->sess == NULL)
 434                         return;
 435
 436                 if (SSL_set_fd(session->sess, fd) == 0)
 437                 {
 438                         ServerInstance->Log(DEBUG,"BUG: Can't set fd with SSL_set_fd: %d", fd);
 439                         return;
 440                 }
 441
 442                 Handshake(session);
 443         }
 444
 445         virtual void OnRawSocketClose(int fd)
 446         {
 447                 CloseSession(&sessions[fd]);
 448
 449                 EventHandler* user = ServerInstance->SE->GetRef(fd);
 450
 451                 if ((user) && (user->GetExt("ssl_cert", dummy)))
 452                 {
 453                         ssl_cert* tofree;
 454                         user->GetExt("ssl_cert", tofree);
 455                         delete tofree;
 456                         user->Shrink("ssl_cert");
 457                 }
 458         }
 459
 460         virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
 461         {
 462                 issl_session* session = &sessions[fd];
 463
 464                 if (!session->sess)
 465                 {
 466                         readresult = 0;
 467                         CloseSession(session);
 468                         return 1;
 469                 }
 470
 471                 if (session->status == ISSL_HANDSHAKING)
 472                 {
 473                         if (session->rstat == ISSL_READ || session->wstat == ISSL_READ)
 474                         {
 475                                 // The handshake isn't finished and it wants to read, try to finish it.
 476                                 if (!Handshake(session))
 477                                 {
 478                                         // Couldn't resume handshake.
 479                                         return -1;
 480                                 }
 481                         }
 482                         else
 483                         {
 484                                 errno = EAGAIN;
 485                                 return -1;
 486                         }
 487                 }
 488
 489                 // If we resumed the handshake then session->status will be ISSL_OPEN
 490
 491                 if (session->status == ISSL_OPEN)
 492                 {
 493                         if (session->wstat == ISSL_READ)
 494                         {
 495                                 if(DoWrite(session) == 0)
 496                                         return 0;
 497                         }
 498
 499                         if (session->rstat == ISSL_READ)
 500                         {
 501                                 int ret = DoRead(session);
 502
 503                                 ServerInstance->Log(DEBUG, "<***> DoRead count: " + ConvToStr(count));
 504                                 ServerInstance->Log(DEBUG, "<***> DoRead ret: " + ConvToStr(ret));
 505                                 ServerInstance->Log(DEBUG, "<***> DoRead session->inbufoffset: " + ConvToStr(session->inbufoffset));
 506
 507                                 if (ret > 0)
 508                                 {
 509                                         if (count <= session->inbufoffset)
 510                                         {
 511                                                 memcpy(buffer, session->inbuf, count);
 512                                                 // Move the stuff left in inbuf to the beginning of it
 513                                                 memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
 514                                                 // Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
 515                                                 session->inbufoffset -= count;
 516                                                 // Insp uses readresult as the count of how much data there is in buffer, so:
 517                                                 readresult = count;
 518                                         }
 519                                         else
 520                                         {
 521                                                 // There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
 522                                                 memcpy(buffer, session->inbuf, session->inbufoffset);
 523
 524                                                 readresult = session->inbufoffset;
 525                                                 // Zero the offset, as there's nothing there..
 526                                                 session->inbufoffset = 0;
 527                                         }
 528
 529                                         return 1;
 530                                 }
 531                                 else
 532                                 {
 533                                         return ret;
 534                                 }
 535                         }
 536                 }
 537
 538                 return -1;
 539         }
 540
 541         virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
 542         {
 543                 issl_session* session = &sessions[fd];
 544
 545                 if (!session->sess)
 546                 {
 547                         CloseSession(session);
 548                         return -1;
 549                 }
 550
 551                 session->outbuf.append(buffer, count);
 552
 553                 if (session->status == ISSL_HANDSHAKING)
 554                 {
 555                         // The handshake isn't finished, try to finish it.
 556                         if (session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
 557                         {
 558                                 Handshake(session);
 559                         }
 560                 }
 561
 562                 if (session->status == ISSL_OPEN)
 563                 {
 564                         if (session->rstat == ISSL_WRITE)
 565                         {
 566                                 DoRead(session);
 567                         }
 568
 569                         if (session->wstat == ISSL_WRITE)
 570                         {
 571                                 return DoWrite(session);
 572                         }
 573                 }
 574
 575                 return 1;
 576         }
 577
 578         int DoWrite(issl_session* session)
 579         {
 580                 if (!session->outbuf.size())
 581                         return -1;
 582
 583                 int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
 584
 585                 if (ret == 0)
 586                 {
 587                         CloseSession(session);
 588                         return 0;
 589                 }
 590                 else if (ret < 0)
 591                 {
 592                         MakePollWrite(session);
 593
 594                         int err = SSL_get_error(session->sess, ret);
 595
 596                         if (err == SSL_ERROR_WANT_WRITE)
 597                         {
 598                                 session->wstat = ISSL_WRITE;
 599                                 return -1;
 600                         }
 601                         else if (err == SSL_ERROR_WANT_READ)
 602                         {
 603                                 session->wstat = ISSL_READ;
 604                                 return -1;
 605                         }
 606                         else
 607                         {
 608                                 CloseSession(session);
 609                                 return 0;
 610                         }
 611                 }
 612                 else
 613                 {
 614                         session->outbuf = session->outbuf.substr(ret);
 615                         MakePollWrite(session);
 616                         return ret;
 617                 }
 618         }
 619
 620         int DoRead(issl_session* session)
 621         {
 622                 // Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
 623                 // Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
 624
 625                 int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
 626
 627                 if (ret == 0)
 628                 {
 629                         // Client closed connection.
 630                         CloseSession(session);
 631                         return 0;
 632                 }
 633                 else if (ret < 0)
 634                 {
 635                         int err = SSL_get_error(session->sess, ret);
 636
 637                         if (err == SSL_ERROR_WANT_READ)
 638                         {
 639                                 session->rstat = ISSL_READ;
 640                                 return -1;
 641                         }
 642                         else if (err == SSL_ERROR_WANT_WRITE)
 643                         {
 644                                 session->rstat = ISSL_WRITE;
 645                                 MakePollWrite(session);
 646                                 return -1;
 647                         }
 648                         else
 649                         {
 650                                 CloseSession(session);
 651                                 return 0;
 652                         }
 653                 }
 654                 else
 655                 {
 656                         // Read successfully 'ret' bytes into inbuf + inbufoffset
 657                         // There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
 658                         // 'buffer' is 'count' long
 659
 660                         session->inbufoffset += ret;
 661
 662                         return ret;
 663                 }
 664         }
 665
 666         // :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
 667         virtual void OnWhois(userrec* source, userrec* dest)
 668         {
 669                 if (!clientactive)
 670                         return;
 671
 672                 // Bugfix, only send this numeric for *our* SSL users
 673                 if (dest->GetExt("ssl", dummy) || (IS_LOCAL(dest) &&  isin(dest->GetPort(), listenports)))
 674                 {
 675                         ServerInstance->SendWhoisLine(source, dest, 320, "%s %s :is using a secure connection", source->nick, dest->nick);
 676                 }
 677         }
 678
 679         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 680         {
 681                 // check if the linking module wants to know about OUR metadata
 682                 if (extname == "ssl")
 683                 {
 684                         // check if this user has an swhois field to send
 685                         if(user->GetExt(extname, dummy))
 686                         {
 687                                 // call this function in the linking module, let it format the data how it
 688                                 // sees fit, and send it on its way. We dont need or want to know how.
 689                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, displayable ? "Enabled" : "ON");
 690                         }
 691                 }
 692         }
 693
 694         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 695         {
 696                 // check if its our metadata key, and its associated with a user
 697                 if ((target_type == TYPE_USER) && (extname == "ssl"))
 698                 {
 699                         userrec* dest = (userrec*)target;
 700                         // if they dont already have an ssl flag, accept the remote server's
 701                         if (!dest->GetExt(extname, dummy))
 702                         {
 703                                 dest->Extend(extname, "ON");
 704                         }
 705                 }
 706         }
 707
 708         bool Handshake(issl_session* session)
 709         {
 710                 int ret;
 711
 712                 if (session->outbound)
 713                 {
 714                         ret = SSL_connect(session->sess);
 715                 }
 716                 else
 717                         ret = SSL_accept(session->sess);
 718
 719                 if (ret < 0)
 720                 {
 721                         int err = SSL_get_error(session->sess, ret);
 722
 723                         if (err == SSL_ERROR_WANT_READ)
 724                         {
 725                                 session->rstat = ISSL_READ;
 726                                 session->status = ISSL_HANDSHAKING;
 727                                 return true;
 728                         }
 729                         else if (err == SSL_ERROR_WANT_WRITE)
 730                         {
 731                                 session->wstat = ISSL_WRITE;
 732                                 session->status = ISSL_HANDSHAKING;
 733                                 MakePollWrite(session);
 734                                 return true;
 735                         }
 736                         else
 737                         {
 738                                 CloseSession(session);
 739                         }
 740
 741                         return false;
 742                 }
 743                 else if (ret > 0)
 744                 {
 745                         // Handshake complete.
 746                         // This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
 747                         userrec* u = ServerInstance->FindDescriptor(session->fd);
 748                         if (u)
 749                         {
 750                                 if (!u->GetExt("ssl", dummy))
 751                                         u->Extend("ssl", "ON");
 752                         }
 753
 754                         session->status = ISSL_OPEN;
 755
 756                         MakePollWrite(session);
 757
 758                         return true;
 759                 }
 760                 else if (ret == 0)
 761                 {
 762                         int ssl_err = SSL_get_error(session->sess, ret);
 763                         char buf[1024];
 764                         ERR_print_errors_fp(stderr);
 765                         ServerInstance->Log(DEBUG,"Handshake fail 2: %d: %s", ssl_err, ERR_error_string(ssl_err,buf));
 766                         CloseSession(session);
 767                         return true;
 768                 }
 769
 770                 return true;
 771         }
 772
 773         virtual void OnPostConnect(userrec* user)
 774         {
 775                 // This occurs AFTER OnUserConnect so we can be sure the
 776                 // protocol module has propogated the NICK message.
 777                 if ((user->GetExt("ssl", dummy)) && (IS_LOCAL(user)))
 778                 {
 779                         // Tell whatever protocol module we're using that we need to inform other servers of this metadata NOW.
 780                         std::deque<std::string>* metadata = new std::deque<std::string>;
 781                         metadata->push_back(user->nick);
 782                         metadata->push_back("ssl");             // The metadata id
 783                         metadata->push_back("ON");              // The value to send
 784                         Event* event = new Event((char*)metadata,(Module*)this,"send_metadata");
 785                         event->Send(ServerInstance);            // Trigger the event. We don't care what module picks it up.
 786                         DELETE(event);
 787                         DELETE(metadata);
 788
 789                         VerifyCertificate(&sessions[user->GetFd()], user);
 790                         if (sessions[user->GetFd()].sess)
 791                                 user->WriteServ("NOTICE %s :*** You are connected using SSL cipher \"%s\"", user->nick, SSL_get_cipher(sessions[user->GetFd()].sess));
 792                 }
 793         }
 794
 795         void MakePollWrite(issl_session* session)
 796         {
 797                 //OnRawSocketWrite(session->fd, NULL, 0);
 798                 EventHandler* eh = ServerInstance->FindDescriptor(session->fd);
 799                 if (eh)
 800                         ServerInstance->SE->WantWrite(eh);
 801         }
 802
 803         virtual void OnBufferFlushed(userrec* user)
 804         {
 805                 if (user->GetExt("ssl"))
 806                 {
 807                         ServerInstance->Log(DEBUG,"OnBufferFlushed for ssl user");
 808                         issl_session* session = &sessions[user->GetFd()];
 809                         if (session && session->outbuf.size())
 810                                 OnRawSocketWrite(user->GetFd(), NULL, 0);
 811                 }
 812         }
 813
 814         void CloseSession(issl_session* session)
 815         {
 816                 if (session->sess)
 817                 {
 818                         SSL_shutdown(session->sess);
 819                         SSL_free(session->sess);
 820                 }
 821
 822                 if (session->inbuf)
 823                 {
 824                         delete[] session->inbuf;
 825                 }
 826
 827                 session->outbuf.clear();
 828                 session->inbuf = NULL;
 829                 session->sess = NULL;
 830                 session->status = ISSL_NONE;
 831         }
 832
 833         void VerifyCertificate(issl_session* session, Extensible* user)
 834         {
 835                 if (!session->sess || !user)
 836                         return;
 837
 838                 X509* cert;
 839                 ssl_cert* certinfo = new ssl_cert;
 840                 unsigned int n;
 841                 unsigned char md[EVP_MAX_MD_SIZE];
 842                 const EVP_MD *digest = EVP_md5();
 843
 844                 user->Extend("ssl_cert",certinfo);
 845
 846                 cert = SSL_get_peer_certificate((SSL*)session->sess);
 847
 848                 if (!cert)
 849                 {
 850                         certinfo->data.insert(std::make_pair("error","Could not get peer certificate: "+std::string(get_error())));
 851                         return;
 852                 }
 853
 854                 certinfo->data.insert(std::make_pair("invalid", SSL_get_verify_result(session->sess) != X509_V_OK ? ConvToStr(1) : ConvToStr(0)));
 855
 856                 if (SelfSigned)
 857                 {
 858                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(0)));
 859                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(1)));
 860                 }
 861                 else
 862                 {
 863                         certinfo->data.insert(std::make_pair("unknownsigner",ConvToStr(1)));
 864                         certinfo->data.insert(std::make_pair("trusted",ConvToStr(0)));
 865                 }
 866
 867                 certinfo->data.insert(std::make_pair("dn",std::string(X509_NAME_oneline(X509_get_subject_name(cert),0,0))));
 868                 certinfo->data.insert(std::make_pair("issuer",std::string(X509_NAME_oneline(X509_get_issuer_name(cert),0,0))));
 869
 870                 if (!X509_digest(cert, digest, md, &n))
 871                 {
 872                         certinfo->data.insert(std::make_pair("error","Out of memory generating fingerprint"));
 873                 }
 874                 else
 875                 {
 876                         certinfo->data.insert(std::make_pair("fingerprint",irc::hex(md, n)));
 877                 }
 878
 879                 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))
 880                 {
 881                         certinfo->data.insert(std::make_pair("error","Not activated, or expired certificate"));
 882                 }
 883
 884                 X509_free(cert);
 885         }
 886 };
 887
 888 static int error_callback(const char *str, size_t len, void *u)
 889 {
 890         ModuleSSLOpenSSL* mssl = (ModuleSSLOpenSSL*)u;
 891         mssl->PublicInstance->Log(DEFAULT, "SSL error: " + std::string(str, len - 1));
 892         return 0;
 893 }
 894
 895 MODULE_INIT(ModuleSSLOpenSSL);
 896