src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 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
  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         bool notify;
  57  public:
  58         StringExtItem realhost;
  59         StringExtItem realip;
  60         LocalStringExt webirc_hostname;
  61         LocalStringExt webirc_ip;
  62
  63         CGIHostlist Hosts;
  64         CommandWebirc(Module* Creator, bool bnotify)
  65                 : Command(Creator, "WEBIRC", 4), notify(bnotify),
  66                   realhost("cgiirc_realhost", Creator), realip("cgiirc_realip", Creator),
  67                   webirc_hostname("cgiirc_webirc_hostname", Creator), webirc_ip("cgiirc_webirc_ip", Creator)
  68                 {
  69                         works_before_reg = true;
  70                         this->syntax = "password client hostname ip";
  71                 }
  72                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  73                 {
  74                         if(user->registered == REG_ALL)
  75                                 return CMD_FAILURE;
  76
  77                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  78                         {
  79                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  80                                 {
  81                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  82                                         {
  83                                                 realhost.set(user, user->host);
  84                                                 realip.set(user, user->GetIPString());
  85                                                 if (notify)
  86                                                         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());
  87                                                 webirc_hostname.set(user, parameters[2]);
  88                                                 webirc_ip.set(user, parameters[3]);
  89                                                 return CMD_SUCCESS;
  90                                         }
  91                                 }
  92                         }
  93
  94                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
  95                         return CMD_FAILURE;
  96                 }
  97 };
  98
  99
 100 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
 101  */
 102 class CGIResolver : public Resolver
 103 {
 104         std::string typ;
 105         int theirfd;
 106         LocalUser* them;
 107         bool notify;
 108  public:
 109         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, bool forward, LocalUser* u, int userfd, const std::string &type, bool &cached)
 110                 : Resolver(source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
 111
 112         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 113         {
 114                 /* Check the user still exists */
 115                 if ((them) && (&them->eh == ServerInstance->SE->GetRef(theirfd)))
 116                 {
 117                         if (notify)
 118                                 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());
 119
 120                         them->host.assign(result,0, 64);
 121                         them->dhost.assign(result, 0, 64);
 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->eh == 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 cmd;
 144         bool NotifyOpers;
 145 public:
 146         ModuleCgiIRC() : cmd(this, NotifyOpers)
 147         {
 148                 OnRehash(NULL);
 149                 ServerInstance->AddCommand(&cmd);
 150                 ServerInstance->Extensions.Register(&cmd.realhost);
 151                 ServerInstance->Extensions.Register(&cmd.realip);
 152                 ServerInstance->Extensions.Register(&cmd.webirc_hostname);
 153                 ServerInstance->Extensions.Register(&cmd.webirc_ip);
 154
 155                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 156                 ServerInstance->Modules->Attach(eventlist, this, 5);
 157         }
 158
 159
 160         virtual void Prioritize()
 161         {
 162                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 163         }
 164
 165         virtual void OnRehash(User* user)
 166         {
 167                 ConfigReader Conf;
 168                 cmd.Hosts.clear();
 169
 170                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 171
 172                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 173                         NotifyOpers = true;
 174
 175                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 176                 {
 177                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 178                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 179                         std::string password = Conf.ReadValue("cgihost", "password", i);
 180
 181                         if(hostmask.length())
 182                         {
 183                                 if (type == "webirc" && !password.length()) {
 184                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 185                                 }
 186                                 else
 187                                 {
 188                                         CGItype cgitype = INVALID;
 189                                         if (type == "pass")
 190                                                 cgitype = PASS;
 191                                         else if (type == "ident")
 192                                                 cgitype = IDENT;
 193                                         else if (type == "passfirst")
 194                                                 cgitype = PASSFIRST;
 195                                         else if (type == "webirc")
 196                                         {
 197                                                 cgitype = WEBIRC;
 198                                         }
 199
 200                                         if (cgitype == INVALID)
 201                                                 cgitype = PASS;
 202
 203                                         cmd.Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 204                                 }
 205                         }
 206                         else
 207                         {
 208                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 209                                 continue;
 210                         }
 211                 }
 212         }
 213
 214         virtual ModResult OnUserRegister(LocalUser* user)
 215         {
 216                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 217                 {
 218                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 219                         {
 220                                 // Deal with it...
 221                                 if(iter->type == PASS)
 222                                 {
 223                                         CheckPass(user); // We do nothing if it fails so...
 224                                         user->CheckLines(true);
 225                                 }
 226                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 227                                 {
 228                                         // If the password lookup failed, try the ident
 229                                         CheckIdent(user);       // If this fails too, do nothing
 230                                         user->CheckLines(true);
 231                                 }
 232                                 else if(iter->type == IDENT)
 233                                 {
 234                                         CheckIdent(user); // Nothing on failure.
 235                                         user->CheckLines(true);
 236                                 }
 237                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 238                                 {
 239                                         // If the ident lookup fails, try the password.
 240                                         CheckPass(user);
 241                                         user->CheckLines(true);
 242                                 }
 243                                 else if(iter->type == WEBIRC)
 244                                 {
 245                                         // We don't need to do anything here
 246                                 }
 247                                 return MOD_RES_PASSTHRU;
 248                         }
 249                 }
 250                 return MOD_RES_PASSTHRU;
 251         }
 252
 253         virtual void OnUserConnect(LocalUser* user)
 254         {
 255                 std::string *webirc_hostname = cmd.webirc_hostname.get(user);
 256                 std::string *webirc_ip = cmd.webirc_ip.get(user);
 257                 if (webirc_hostname)
 258                 {
 259                         user->host.assign(*webirc_hostname, 0, 64);
 260                         user->dhost.assign(*webirc_hostname, 0, 64);
 261                         user->InvalidateCache();
 262                         cmd.webirc_hostname.unset(user);
 263                 }
 264                 if (webirc_ip)
 265                 {
 266                         ServerInstance->Users->RemoveCloneCounts(user);
 267                         user->SetClientIP(webirc_ip->c_str());
 268                         user->InvalidateCache();
 269                         cmd.webirc_ip.unset(user);
 270                         ServerInstance->Users->AddLocalClone(user);
 271                         ServerInstance->Users->AddGlobalClone(user);
 272                         user->SetClass();
 273                         user->CheckClass();
 274                         user->CheckLines(true);
 275                 }
 276         }
 277
 278         bool CheckPass(LocalUser* user)
 279         {
 280                 if(IsValidHost(user->password))
 281                 {
 282                         cmd.realhost.set(user, user->host);
 283                         cmd.realip.set(user, user->GetIPString());
 284                         user->host.assign(user->password, 0, 64);
 285                         user->dhost.assign(user->password, 0, 64);
 286                         user->InvalidateCache();
 287
 288                         ServerInstance->Users->RemoveCloneCounts(user);
 289                         user->SetClientIP(user->password.c_str());
 290                         ServerInstance->Users->AddLocalClone(user);
 291                         ServerInstance->Users->AddGlobalClone(user);
 292                         user->SetClass();
 293                         user->CheckClass();
 294
 295                         try
 296                         {
 297
 298                                 bool cached;
 299                                 CGIResolver* r = new CGIResolver(this, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 300                                 ServerInstance->AddResolver(r, cached);
 301                         }
 302                         catch (...)
 303                         {
 304                                 if (NotifyOpers)
 305                                         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());
 306                         }
 307
 308                         user->password.clear();
 309                         return true;
 310                 }
 311
 312                 return false;
 313         }
 314
 315         bool CheckIdent(LocalUser* user)
 316         {
 317                 const char* ident;
 318                 int len = user->ident.length();
 319                 in_addr newip;
 320
 321                 if(len == 8)
 322                         ident = user->ident.c_str();
 323                 else if(len == 9 && user->ident[0] == '~')
 324                         ident = user->ident.c_str() + 1;
 325                 else
 326                         return false;
 327
 328                 errno = 0;
 329                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 330                 if (errno)
 331                         return false;
 332                 newip.s_addr = htonl(ipaddr);
 333                 char* newipstr = inet_ntoa(newip);
 334
 335                 cmd.realhost.set(user, user->host);
 336                 cmd.realip.set(user, user->GetIPString());
 337                 ServerInstance->Users->RemoveCloneCounts(user);
 338                 user->SetClientIP(newipstr);
 339                 ServerInstance->Users->AddLocalClone(user);
 340                 ServerInstance->Users->AddGlobalClone(user);
 341                 user->SetClass();
 342                 user->CheckClass();
 343                 user->host = newipstr;
 344                 user->dhost = newipstr;
 345                 user->ident.assign("~cgiirc", 0, 8);
 346                 try
 347                 {
 348
 349                         bool cached;
 350                         CGIResolver* r = new CGIResolver(this, NotifyOpers, newipstr, false, user, user->GetFd(), "IDENT", cached);
 351                         ServerInstance->AddResolver(r, cached);
 352                 }
 353                 catch (...)
 354                 {
 355                         user->InvalidateCache();
 356
 357                         if(NotifyOpers)
 358                                  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());
 359                 }
 360
 361                 return true;
 362         }
 363
 364         bool IsValidHost(const std::string &host)
 365         {
 366                 if(!host.size())
 367                         return false;
 368
 369                 for(unsigned int i = 0; i < host.size(); i++)
 370                 {
 371                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 372                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 373                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 374                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 375                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 376
 377                                 continue;
 378                         else
 379                                 return false;
 380                 }
 381
 382                 return true;
 383         }
 384
 385         bool IsValidIP(const std::string &ip)
 386         {
 387                 if(ip.size() < 7 || ip.size() > 15)
 388                         return false;
 389
 390                 short sincedot = 0;
 391                 short dots = 0;
 392
 393                 for(unsigned int i = 0; i < ip.size(); i++)
 394                 {
 395                         if((dots <= 3) && (sincedot <= 3))
 396                         {
 397                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 398                                 {
 399                                         sincedot++;
 400                                 }
 401                                 else if(ip[i] == '.')
 402                                 {
 403                                         sincedot = 0;
 404                                         dots++;
 405                                 }
 406                         }
 407                         else
 408                         {
 409                                 return false;
 410
 411                         }
 412                 }
 413
 414                 if(dots != 3)
 415                         return false;
 416
 417                 return true;
 418         }
 419
 420         virtual ~ModuleCgiIRC()
 421         {
 422         }
 423
 424         virtual Version GetVersion()
 425         {
 426                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
 427         }
 428
 429 };
 430
 431 MODULE_INIT(ModuleCgiIRC)