src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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 #ifndef WINDOWS
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #endif
  21
  22 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  23
  24 enum CGItype { INVALID, PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
  25
  26
  27 /** Holds a CGI site's details
  28  */
  29 class CGIhost : public classbase
  30 {
  31 public:
  32         std::string hostmask;
  33         CGItype type;
  34         std::string password;
  35
  36         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST, const std::string &spassword ="")
  37         : hostmask(mask), type(t), password(spassword)
  38         {
  39         }
  40 };
  41 typedef std::vector<CGIhost> CGIHostlist;
  42
  43 /*
  44  * WEBIRC
  45  *  This is used for the webirc method of CGIIRC auth, and is (really) the best way to do these things.
  46  *  Syntax: WEBIRC password client hostname ip
  47  *  Where password is a shared key, client is the name of the "client" and version (e.g. cgiirc), hostname
  48  *  is the resolved host of the client issuing the command and IP is the real IP of the client.
  49  *
  50  * How it works:
  51  *  To tie in with the rest of cgiirc module, and to avoid race conditions, /webirc is only processed locally
  52  *  and simply sets metadata on the user, which is later decoded on full connect to give something meaningful.
  53  */
  54 class CommandWebirc : public Command
  55 {
  56         CGIHostlist Hosts;
  57         bool notify;
  58         public:
  59                 CommandWebirc(InspIRCd* Instance, CGIHostlist &cHosts, bool bnotify) : Command(Instance, "WEBIRC", 0, 4, true), Hosts(cHosts), notify(bnotify)
  60                 {
  61                         this->source = "m_cgiirc.so";
  62                         this->syntax = "password client hostname ip";
  63                 }
  64                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  65                 {
  66                         if(user->registered == REG_ALL)
  67                                 return CMD_FAILURE;
  68
  69                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  70                         {
  71                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  72                                 {
  73                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  74                                         {
  75                                                 user->Extend("cgiirc_realhost", new std::string(user->host));
  76                                                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
  77                                                 if (notify)
  78                                                         ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick.c_str(), user->host.c_str(), parameters[2].c_str(), user->host.c_str());
  79                                                 user->Extend("cgiirc_webirc_hostname", new std::string(parameters[2]));
  80                                                 user->Extend("cgiirc_webirc_ip", new std::string(parameters[3]));
  81                                                 return CMD_LOCALONLY;
  82                                         }
  83                                 }
  84                         }
  85
  86                         ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
  87                         return CMD_FAILURE;
  88                 }
  89 };
  90
  91
  92 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
  93  */
  94 class CGIResolver : public Resolver
  95 {
  96         std::string typ;
  97         int theirfd;
  98         User* them;
  99         bool notify;
 100  public:
 101         CGIResolver(Module* me, InspIRCd* Instance, bool NotifyOpers, const std::string &source, bool forward, User* u, int userfd, const std::string &type, bool &cached)
 102                 : Resolver(Instance, source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
 103
 104         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached, int resultnum = 0)
 105         {
 106                 if (resultnum)
 107                         return;
 108
 109                 /* Check the user still exists */
 110                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 111                 {
 112                         if (notify)
 113                                 ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", them->nick.c_str(), them->host.c_str(), result.c_str(), typ.c_str());
 114
 115                         them->host.assign(result,0, 64);
 116                         them->dhost.assign(result, 0, 64);
 117                         if (querytype)
 118                                 them->SetSockAddr(them->GetProtocolFamily(), result.c_str(), them->GetPort());
 119                         them->ident.assign("~cgiirc", 0, 8);
 120                         them->InvalidateCache();
 121                         them->CheckLines(true);
 122                 }
 123         }
 124
 125         virtual void OnError(ResolverError e, const std::string &errormessage)
 126         {
 127                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 128                 {
 129                         if (notify)
 130                                 ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), but their host can't be resolved from their %s!", them->nick.c_str(), them->host.c_str(), typ.c_str());
 131                 }
 132         }
 133
 134         virtual ~CGIResolver()
 135         {
 136         }
 137 };
 138
 139 class ModuleCgiIRC : public Module
 140 {
 141         CommandWebirc* mycommand;
 142         bool NotifyOpers;
 143         CGIHostlist Hosts;
 144 public:
 145         ModuleCgiIRC(InspIRCd* Me) : Module(Me)
 146         {
 147
 148                 OnRehash(NULL,"");
 149                 mycommand = new CommandWebirc(Me, Hosts, NotifyOpers);
 150                 ServerInstance->AddCommand(mycommand);
 151
 152                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 153                 ServerInstance->Modules->Attach(eventlist, this, 7);
 154         }
 155
 156
 157         virtual void Prioritize()
 158         {
 159                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 160         }
 161
 162         virtual void OnRehash(User* user, const std::string &parameter)
 163         {
 164                 ConfigReader Conf(ServerInstance);
 165                 Hosts.clear();
 166
 167                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 168
 169                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 170                         NotifyOpers = true;
 171
 172                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 173                 {
 174                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 175                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 176                         std::string password = Conf.ReadValue("cgihost", "password", i);
 177
 178                         if(hostmask.length())
 179                         {
 180                                 if (type == "webirc" && !password.length()) {
 181                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 182                                 }
 183                                 else
 184                                 {
 185                                         CGItype cgitype = INVALID;
 186                                         if (type == "pass")
 187                                                 cgitype = PASS;
 188                                         else if (type == "ident")
 189                                                 cgitype = IDENT;
 190                                         else if (type == "passfirst")
 191                                                 cgitype = PASSFIRST;
 192                                         else if (type == "webirc")
 193                                         {
 194                                                 cgitype = WEBIRC;
 195                                         }
 196
 197                                         if (cgitype == INVALID)
 198                                                 cgitype = PASS;
 199
 200                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 201                                 }
 202                         }
 203                         else
 204                         {
 205                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 206                                 continue;
 207                         }
 208                 }
 209         }
 210
 211         virtual void OnCleanup(int target_type, void* item)
 212         {
 213                 if(target_type == TYPE_USER)
 214                 {
 215                         User* user = (User*)item;
 216                         std::string* realhost;
 217                         std::string* realip;
 218
 219                         if(user->GetExt("cgiirc_realhost", realhost))
 220                         {
 221                                 delete realhost;
 222                                 user->Shrink("cgiirc_realhost");
 223                         }
 224
 225                         if(user->GetExt("cgiirc_realip", realip))
 226                         {
 227                                 delete realip;
 228                                 user->Shrink("cgiirc_realip");
 229                         }
 230                 }
 231         }
 232
 233         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 234         {
 235                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 236                 {
 237                         std::string* data;
 238
 239                         if(user->GetExt(extname, data))
 240                         {
 241                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 242                         }
 243                 }
 244         }
 245
 246         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 247         {
 248                 if(target_type == TYPE_USER)
 249                 {
 250                         User* dest = (User*)target;
 251                         std::string* bleh;
 252                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 253                         {
 254                                 dest->Extend(extname, new std::string(extdata));
 255                         }
 256                 }
 257         }
 258
 259         virtual void OnUserDisconnect(User* user)
 260         {
 261                 OnCleanup(TYPE_USER, user);
 262         }
 263
 264
 265         virtual int OnUserRegister(User* user)
 266         {
 267                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 268                 {
 269                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 270                         {
 271                                 // Deal with it...
 272                                 if(iter->type == PASS)
 273                                 {
 274                                         CheckPass(user); // We do nothing if it fails so...
 275                                         user->CheckLines(true);
 276                                 }
 277                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 278                                 {
 279                                         // If the password lookup failed, try the ident
 280                                         CheckIdent(user);       // If this fails too, do nothing
 281                                         user->CheckLines(true);
 282                                 }
 283                                 else if(iter->type == IDENT)
 284                                 {
 285                                         CheckIdent(user); // Nothing on failure.
 286                                         user->CheckLines(true);
 287                                 }
 288                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 289                                 {
 290                                         // If the ident lookup fails, try the password.
 291                                         CheckPass(user);
 292                                         user->CheckLines(true);
 293                                 }
 294                                 else if(iter->type == WEBIRC)
 295                                 {
 296                                         // We don't need to do anything here
 297                                 }
 298                                 return 0;
 299                         }
 300                 }
 301                 return 0;
 302         }
 303
 304         virtual void OnUserConnect(User* user)
 305         {
 306                 std::string *webirc_hostname, *webirc_ip;
 307                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 308                 {
 309                         user->host.assign(*webirc_hostname, 0, 64);
 310                         user->dhost.assign(*webirc_hostname, 0, 64);
 311                         delete webirc_hostname;
 312                         user->InvalidateCache();
 313                         user->Shrink("cgiirc_webirc_hostname");
 314                 }
 315                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 316                 {
 317                         ServerInstance->Users->RemoveCloneCounts(user);
 318                         user->SetSockAddr(user->GetProtocolFamily(), webirc_ip->c_str(), user->GetPort());
 319                         delete webirc_ip;
 320                         user->InvalidateCache();
 321                         user->Shrink("cgiirc_webirc_ip");
 322                         ServerInstance->Users->AddLocalClone(user);
 323                         ServerInstance->Users->AddGlobalClone(user);
 324                         user->CheckClass();
 325                         user->CheckLines(true);
 326                 }
 327         }
 328
 329         bool CheckPass(User* user)
 330         {
 331                 if(IsValidHost(user->password))
 332                 {
 333                         user->Extend("cgiirc_realhost", new std::string(user->host));
 334                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 335                         user->host.assign(user->password, 0, 64);
 336                         user->dhost.assign(user->password, 0, 64);
 337                         user->InvalidateCache();
 338
 339                         bool valid = false;
 340                         ServerInstance->Users->RemoveCloneCounts(user);
 341 #ifdef IPV6
 342                         if (user->GetProtocolFamily() == AF_INET6)
 343                                 valid = (inet_pton(AF_INET6, user->password.c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 344                         else
 345                                 valid = (inet_aton(user->password.c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 346 #else
 347                         if (inet_aton(user->password.c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 348                                 valid = true;
 349 #endif
 350                         ServerInstance->Users->AddLocalClone(user);
 351                         ServerInstance->Users->AddGlobalClone(user);
 352                         user->CheckClass();
 353
 354                         if (valid)
 355                         {
 356                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 357                                 if(NotifyOpers)
 358                                         ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick.c_str(), user->host.c_str(), user->password.c_str());
 359                         }
 360                         else
 361                         {
 362                                 /* We got as resolved hostname in the password. */
 363                                 try
 364                                 {
 365
 366                                         bool cached;
 367                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 368                                         ServerInstance->AddResolver(r, cached);
 369                                 }
 370                                 catch (...)
 371                                 {
 372                                         if (NotifyOpers)
 373                                                 ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname!", user->nick.c_str(), user->host.c_str());
 374                                 }
 375                         }
 376
 377                         user->password.clear();
 378                         return true;
 379                 }
 380
 381                 return false;
 382         }
 383
 384         bool CheckIdent(User* user)
 385         {
 386                 int ip[4];
 387                 const char* ident;
 388                 char newip[16];
 389                 int len = user->ident.length();
 390
 391                 if(len == 8)
 392                         ident = user->ident.c_str();
 393                 else if(len == 9 && user->ident[0] == '~')
 394                         ident = user->ident.c_str() + 1;
 395                 else
 396                         return false;
 397
 398                 for(int i = 0; i < 4; i++)
 399                         if(!HexToInt(ip[i], ident + i*2))
 400                                 return false;
 401
 402                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 403
 404                 user->Extend("cgiirc_realhost", new std::string(user->host));
 405                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 406                 ServerInstance->Users->RemoveCloneCounts(user);
 407                 user->SetSockAddr(user->GetProtocolFamily(), newip, user->GetPort());
 408                 ServerInstance->Users->AddLocalClone(user);
 409                 ServerInstance->Users->AddGlobalClone(user);
 410                 user->CheckClass();
 411                 try
 412                 {
 413                         user->host.assign(newip, 0, 16);
 414                         user->dhost.assign(newip, 0, 16);
 415                         user->ident.assign("~cgiirc", 0, 8);
 416
 417                         bool cached;
 418                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 419                         ServerInstance->AddResolver(r, cached);
 420                 }
 421                 catch (...)
 422                 {
 423                         user->host.assign(newip, 0, 16);
 424                         user->dhost.assign(newip, 0, 16);
 425                         user->ident.assign("~cgiirc", 0, 8);
 426                         user->InvalidateCache();
 427
 428                         if(NotifyOpers)
 429                                  ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname!", user->nick.c_str(), user->host.c_str());
 430                 }
 431
 432                 return true;
 433         }
 434
 435         bool IsValidHost(const std::string &host)
 436         {
 437                 if(!host.size())
 438                         return false;
 439
 440                 for(unsigned int i = 0; i < host.size(); i++)
 441                 {
 442                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 443                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 444                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 445                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 446                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 447
 448                                 continue;
 449                         else
 450                                 return false;
 451                 }
 452
 453                 return true;
 454         }
 455
 456         bool IsValidIP(const std::string &ip)
 457         {
 458                 if(ip.size() < 7 || ip.size() > 15)
 459                         return false;
 460
 461                 short sincedot = 0;
 462                 short dots = 0;
 463
 464                 for(unsigned int i = 0; i < ip.size(); i++)
 465                 {
 466                         if((dots <= 3) && (sincedot <= 3))
 467                         {
 468                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 469                                 {
 470                                         sincedot++;
 471                                 }
 472                                 else if(ip[i] == '.')
 473                                 {
 474                                         sincedot = 0;
 475                                         dots++;
 476                                 }
 477                         }
 478                         else
 479                         {
 480                                 return false;
 481
 482                         }
 483                 }
 484
 485                 if(dots != 3)
 486                         return false;
 487
 488                 return true;
 489         }
 490
 491         bool HexToInt(int &out, const char* in)
 492         {
 493                 char ip[3];
 494                 ip[0] = in[0];
 495                 ip[1] = in[1];
 496                 ip[2] = 0;
 497                 out = strtol(ip, NULL, 16);
 498
 499                 if(out > 255 || out < 0)
 500                         return false;
 501
 502                 return true;
 503         }
 504
 505         virtual ~ModuleCgiIRC()
 506         {
 507         }
 508
 509         virtual Version GetVersion()
 510         {
 511                 return Version("$Id$",VF_VENDOR,API_VERSION);
 512         }
 513
 514 };
 515
 516 MODULE_INIT(ModuleCgiIRC)