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://wiki.inspircd.org/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, bool bnotify) : Command(Instance, "WEBIRC", 0, 4, true), 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->WriteGlobalSno('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->WriteGlobalSno('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                 void SetHosts(CGIHostlist &phosts)
  91                 {
  92                         this->Hosts = phosts;
  93                 }
  94 };
  95
  96
  97 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
  98  */
  99 class CGIResolver : public Resolver
 100 {
 101         std::string typ;
 102         int theirfd;
 103         User* them;
 104         bool notify;
 105  public:
 106         CGIResolver(Module* me, InspIRCd* Instance, bool NotifyOpers, const std::string &source, bool forward, User* u, int userfd, const std::string &type, bool &cached)
 107                 : Resolver(Instance, source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
 108
 109         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 110         {
 111                 /* Check the user still exists */
 112                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 113                 {
 114                         if (notify)
 115                                 ServerInstance->SNO->WriteGlobalSno('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());
 116
 117                         them->host.assign(result,0, 64);
 118                         them->dhost.assign(result, 0, 64);
 119                         if (querytype)
 120                                 them->SetClientIP(result.c_str());
 121                         them->ident.assign("~cgiirc", 0, 8);
 122                         them->InvalidateCache();
 123                         them->CheckLines(true);
 124                 }
 125         }
 126
 127         virtual void OnError(ResolverError e, const std::string &errormessage)
 128         {
 129                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 130                 {
 131                         if (notify)
 132                                 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());
 133                 }
 134         }
 135
 136         virtual ~CGIResolver()
 137         {
 138         }
 139 };
 140
 141 class ModuleCgiIRC : public Module
 142 {
 143         CommandWebirc* mycommand;
 144         bool NotifyOpers;
 145         CGIHostlist Hosts;
 146 public:
 147         ModuleCgiIRC(InspIRCd* Me) : Module(Me)
 148         {
 149                 mycommand = new CommandWebirc(Me, NotifyOpers);
 150                 OnRehash(NULL);
 151                 ServerInstance->AddCommand(mycommand);
 152
 153                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 154                 ServerInstance->Modules->Attach(eventlist, this, 7);
 155         }
 156
 157
 158         virtual void Prioritize()
 159         {
 160                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 161         }
 162
 163         virtual void OnRehash(User* user)
 164         {
 165                 ConfigReader Conf(ServerInstance);
 166                 Hosts.clear();
 167
 168                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 169
 170                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 171                         NotifyOpers = true;
 172
 173                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 174                 {
 175                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 176                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 177                         std::string password = Conf.ReadValue("cgihost", "password", i);
 178
 179                         if(hostmask.length())
 180                         {
 181                                 if (type == "webirc" && !password.length()) {
 182                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 183                                 }
 184                                 else
 185                                 {
 186                                         CGItype cgitype = INVALID;
 187                                         if (type == "pass")
 188                                                 cgitype = PASS;
 189                                         else if (type == "ident")
 190                                                 cgitype = IDENT;
 191                                         else if (type == "passfirst")
 192                                                 cgitype = PASSFIRST;
 193                                         else if (type == "webirc")
 194                                         {
 195                                                 cgitype = WEBIRC;
 196                                         }
 197
 198                                         if (cgitype == INVALID)
 199                                                 cgitype = PASS;
 200
 201                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 202                                 }
 203                         }
 204                         else
 205                         {
 206                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 207                                 continue;
 208                         }
 209                 }
 210
 211                 mycommand->SetHosts(Hosts);
 212         }
 213
 214         virtual void OnCleanup(int target_type, void* item)
 215         {
 216                 if(target_type == TYPE_USER)
 217                 {
 218                         User* user = (User*)item;
 219                         std::string* realhost;
 220                         std::string* realip;
 221
 222                         if(user->GetExt("cgiirc_realhost", realhost))
 223                         {
 224                                 delete realhost;
 225                                 user->Shrink("cgiirc_realhost");
 226                         }
 227
 228                         if(user->GetExt("cgiirc_realip", realip))
 229                         {
 230                                 delete realip;
 231                                 user->Shrink("cgiirc_realip");
 232                         }
 233                 }
 234         }
 235
 236         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 237         {
 238                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 239                 {
 240                         std::string* data;
 241
 242                         if(user->GetExt(extname, data))
 243                         {
 244                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 245                         }
 246                 }
 247         }
 248
 249         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 250         {
 251                 if(target_type == TYPE_USER)
 252                 {
 253                         User* dest = (User*)target;
 254                         std::string* bleh;
 255                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 256                         {
 257                                 dest->Extend(extname, new std::string(extdata));
 258                         }
 259                 }
 260         }
 261
 262         virtual void OnUserDisconnect(User* user)
 263         {
 264                 OnCleanup(TYPE_USER, user);
 265         }
 266
 267
 268         virtual int OnUserRegister(User* user)
 269         {
 270                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 271                 {
 272                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 273                         {
 274                                 // Deal with it...
 275                                 if(iter->type == PASS)
 276                                 {
 277                                         CheckPass(user); // We do nothing if it fails so...
 278                                         user->CheckLines(true);
 279                                 }
 280                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 281                                 {
 282                                         // If the password lookup failed, try the ident
 283                                         CheckIdent(user);       // If this fails too, do nothing
 284                                         user->CheckLines(true);
 285                                 }
 286                                 else if(iter->type == IDENT)
 287                                 {
 288                                         CheckIdent(user); // Nothing on failure.
 289                                         user->CheckLines(true);
 290                                 }
 291                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 292                                 {
 293                                         // If the ident lookup fails, try the password.
 294                                         CheckPass(user);
 295                                         user->CheckLines(true);
 296                                 }
 297                                 else if(iter->type == WEBIRC)
 298                                 {
 299                                         // We don't need to do anything here
 300                                 }
 301                                 return 0;
 302                         }
 303                 }
 304                 return 0;
 305         }
 306
 307         virtual void OnUserConnect(User* user)
 308         {
 309                 std::string *webirc_hostname, *webirc_ip;
 310                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 311                 {
 312                         user->host.assign(*webirc_hostname, 0, 64);
 313                         user->dhost.assign(*webirc_hostname, 0, 64);
 314                         delete webirc_hostname;
 315                         user->InvalidateCache();
 316                         user->Shrink("cgiirc_webirc_hostname");
 317                 }
 318                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 319                 {
 320                         ServerInstance->Users->RemoveCloneCounts(user);
 321                         user->SetClientIP(webirc_ip->c_str());
 322                         delete webirc_ip;
 323                         user->InvalidateCache();
 324                         user->Shrink("cgiirc_webirc_ip");
 325                         ServerInstance->Users->AddLocalClone(user);
 326                         ServerInstance->Users->AddGlobalClone(user);
 327                         user->CheckClass();
 328                         user->CheckLines(true);
 329                 }
 330         }
 331
 332         bool CheckPass(User* user)
 333         {
 334                 if(IsValidHost(user->password))
 335                 {
 336                         user->Extend("cgiirc_realhost", new std::string(user->host));
 337                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 338                         user->host.assign(user->password, 0, 64);
 339                         user->dhost.assign(user->password, 0, 64);
 340                         user->InvalidateCache();
 341
 342                         bool valid = false;
 343                         ServerInstance->Users->RemoveCloneCounts(user);
 344                         valid = user->SetClientIP(user->password.c_str());
 345                         ServerInstance->Users->AddLocalClone(user);
 346                         ServerInstance->Users->AddGlobalClone(user);
 347                         user->CheckClass();
 348
 349                         if (valid)
 350                         {
 351                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 352                                 if(NotifyOpers)
 353                                         ServerInstance->SNO->WriteGlobalSno('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());
 354                         }
 355                         else
 356                         {
 357                                 /* We got as resolved hostname in the password. */
 358                                 try
 359                                 {
 360
 361                                         bool cached;
 362                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 363                                         ServerInstance->AddResolver(r, cached);
 364                                 }
 365                                 catch (...)
 366                                 {
 367                                         if (NotifyOpers)
 368                                                 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());
 369                                 }
 370                         }
 371
 372                         user->password.clear();
 373                         return true;
 374                 }
 375
 376                 return false;
 377         }
 378
 379         bool CheckIdent(User* user)
 380         {
 381                 const char* ident;
 382                 int len = user->ident.length();
 383                 in_addr newip;
 384
 385                 if(len == 8)
 386                         ident = user->ident.c_str();
 387                 else if(len == 9 && user->ident[0] == '~')
 388                         ident = user->ident.c_str() + 1;
 389                 else
 390                         return false;
 391
 392                 errno = 0;
 393                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 394                 if (errno)
 395                         return false;
 396                 newip.s_addr = htonl(ipaddr);
 397                 char* newipstr = inet_ntoa(newip);
 398
 399                 user->Extend("cgiirc_realhost", new std::string(user->host));
 400                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 401                 ServerInstance->Users->RemoveCloneCounts(user);
 402                 user->SetClientIP(newipstr);
 403                 ServerInstance->Users->AddLocalClone(user);
 404                 ServerInstance->Users->AddGlobalClone(user);
 405                 user->CheckClass();
 406                 user->host = newipstr;
 407                 user->dhost = newipstr;
 408                 user->ident.assign("~cgiirc", 0, 8);
 409                 try
 410                 {
 411
 412                         bool cached;
 413                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newipstr, false, user, user->GetFd(), "IDENT", cached);
 414                         ServerInstance->AddResolver(r, cached);
 415                 }
 416                 catch (...)
 417                 {
 418                         user->InvalidateCache();
 419
 420                         if(NotifyOpers)
 421                                  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());
 422                 }
 423
 424                 return true;
 425         }
 426
 427         bool IsValidHost(const std::string &host)
 428         {
 429                 if(!host.size())
 430                         return false;
 431
 432                 for(unsigned int i = 0; i < host.size(); i++)
 433                 {
 434                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 435                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 436                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 437                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 438                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 439
 440                                 continue;
 441                         else
 442                                 return false;
 443                 }
 444
 445                 return true;
 446         }
 447
 448         bool IsValidIP(const std::string &ip)
 449         {
 450                 if(ip.size() < 7 || ip.size() > 15)
 451                         return false;
 452
 453                 short sincedot = 0;
 454                 short dots = 0;
 455
 456                 for(unsigned int i = 0; i < ip.size(); i++)
 457                 {
 458                         if((dots <= 3) && (sincedot <= 3))
 459                         {
 460                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 461                                 {
 462                                         sincedot++;
 463                                 }
 464                                 else if(ip[i] == '.')
 465                                 {
 466                                         sincedot = 0;
 467                                         dots++;
 468                                 }
 469                         }
 470                         else
 471                         {
 472                                 return false;
 473
 474                         }
 475                 }
 476
 477                 if(dots != 3)
 478                         return false;
 479
 480                 return true;
 481         }
 482
 483         virtual ~ModuleCgiIRC()
 484         {
 485         }
 486
 487         virtual Version GetVersion()
 488         {
 489                 return Version("$Id$",VF_VENDOR,API_VERSION);
 490         }
 491
 492 };
 493
 494 MODULE_INIT(ModuleCgiIRC)