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         std::string theiruid;
 106         bool notify;
 107  public:
 108         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, bool forward, LocalUser* u, const std::string &type, bool &cached)
 109                 : Resolver(source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theiruid(u->uuid), notify(NotifyOpers) { }
 110
 111         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 112         {
 113                 /* Check the user still exists */
 114                 User* them = ServerInstance->FindUUID(theiruid);
 115                 if (them)
 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                         if (result.length() > 64)
 121                                 return;
 122                         them->host = result;
 123                         them->dhost = result;
 124                         them->InvalidateCache();
 125                         them->CheckLines(true);
 126                 }
 127         }
 128
 129         virtual void OnError(ResolverError e, const std::string &errormessage)
 130         {
 131                 User* them = ServerInstance->FindUUID(theiruid);
 132                 if (them)
 133                 if (them)
 134                 {
 135                         if (notify)
 136                                 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());
 137                 }
 138         }
 139
 140         virtual ~CGIResolver()
 141         {
 142         }
 143 };
 144
 145 class ModuleCgiIRC : public Module
 146 {
 147         CommandWebirc cmd;
 148         bool NotifyOpers;
 149 public:
 150         ModuleCgiIRC() : cmd(this, NotifyOpers)
 151         {
 152                 OnRehash(NULL);
 153                 ServerInstance->AddCommand(&cmd);
 154                 ServerInstance->Extensions.Register(&cmd.realhost);
 155                 ServerInstance->Extensions.Register(&cmd.realip);
 156                 ServerInstance->Extensions.Register(&cmd.webirc_hostname);
 157                 ServerInstance->Extensions.Register(&cmd.webirc_ip);
 158
 159                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 160                 ServerInstance->Modules->Attach(eventlist, this, 5);
 161         }
 162
 163
 164         virtual void Prioritize()
 165         {
 166                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 167         }
 168
 169         virtual void OnRehash(User* user)
 170         {
 171                 ConfigReader Conf;
 172                 cmd.Hosts.clear();
 173
 174                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 175
 176                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 177                         NotifyOpers = true;
 178
 179                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 180                 {
 181                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 182                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 183                         std::string password = Conf.ReadValue("cgihost", "password", i);
 184
 185                         if(hostmask.length())
 186                         {
 187                                 if (type == "webirc" && !password.length()) {
 188                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 189                                 }
 190                                 else
 191                                 {
 192                                         CGItype cgitype = INVALID;
 193                                         if (type == "pass")
 194                                                 cgitype = PASS;
 195                                         else if (type == "ident")
 196                                                 cgitype = IDENT;
 197                                         else if (type == "passfirst")
 198                                                 cgitype = PASSFIRST;
 199                                         else if (type == "webirc")
 200                                         {
 201                                                 cgitype = WEBIRC;
 202                                         }
 203
 204                                         if (cgitype == INVALID)
 205                                                 cgitype = PASS;
 206
 207                                         cmd.Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 208                                 }
 209                         }
 210                         else
 211                         {
 212                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 213                                 continue;
 214                         }
 215                 }
 216         }
 217
 218         virtual ModResult OnUserRegister(LocalUser* user)
 219         {
 220                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 221                 {
 222                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 223                         {
 224                                 // Deal with it...
 225                                 if(iter->type == PASS)
 226                                 {
 227                                         CheckPass(user); // We do nothing if it fails so...
 228                                         user->CheckLines(true);
 229                                 }
 230                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 231                                 {
 232                                         // If the password lookup failed, try the ident
 233                                         CheckIdent(user);       // If this fails too, do nothing
 234                                         user->CheckLines(true);
 235                                 }
 236                                 else if(iter->type == IDENT)
 237                                 {
 238                                         CheckIdent(user); // Nothing on failure.
 239                                         user->CheckLines(true);
 240                                 }
 241                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 242                                 {
 243                                         // If the ident lookup fails, try the password.
 244                                         CheckPass(user);
 245                                         user->CheckLines(true);
 246                                 }
 247                                 else if(iter->type == WEBIRC)
 248                                 {
 249                                         // We don't need to do anything here
 250                                 }
 251                                 return MOD_RES_PASSTHRU;
 252                         }
 253                 }
 254                 return MOD_RES_PASSTHRU;
 255         }
 256
 257         virtual void OnUserConnect(LocalUser* user)
 258         {
 259                 std::string *webirc_hostname = cmd.webirc_hostname.get(user);
 260                 std::string *webirc_ip = cmd.webirc_ip.get(user);
 261                 if (webirc_hostname && webirc_hostname->length() < 64)
 262                 {
 263                         user->host = *webirc_hostname;
 264                         user->dhost = *webirc_hostname;
 265                         user->InvalidateCache();
 266                 }
 267                 if (webirc_ip)
 268                 {
 269                         ServerInstance->Users->RemoveCloneCounts(user);
 270                         user->SetClientIP(webirc_ip->c_str());
 271                         user->InvalidateCache();
 272                         cmd.webirc_ip.unset(user);
 273                         ServerInstance->Users->AddLocalClone(user);
 274                         ServerInstance->Users->AddGlobalClone(user);
 275                         user->SetClass();
 276                         user->CheckClass();
 277                         user->CheckLines(true);
 278                 }
 279                 cmd.webirc_hostname.unset(user);
 280         }
 281
 282         bool CheckPass(LocalUser* user)
 283         {
 284                 if(IsValidHost(user->password))
 285                 {
 286                         cmd.realhost.set(user, user->host);
 287                         cmd.realip.set(user, user->GetIPString());
 288                         user->host = user->password;
 289                         user->dhost = user->password;
 290                         user->InvalidateCache();
 291
 292                         ServerInstance->Users->RemoveCloneCounts(user);
 293                         user->SetClientIP(user->password.c_str());
 294                         ServerInstance->Users->AddLocalClone(user);
 295                         ServerInstance->Users->AddGlobalClone(user);
 296                         user->SetClass();
 297                         user->CheckClass();
 298
 299                         try
 300                         {
 301
 302                                 bool cached;
 303                                 CGIResolver* r = new CGIResolver(this, NotifyOpers, user->password, false, user, "PASS", cached);
 304                                 ServerInstance->AddResolver(r, cached);
 305                         }
 306                         catch (...)
 307                         {
 308                                 if (NotifyOpers)
 309                                         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());
 310                         }
 311
 312                         user->password.clear();
 313                         return true;
 314                 }
 315
 316                 return false;
 317         }
 318
 319         bool CheckIdent(LocalUser* user)
 320         {
 321                 const char* ident;
 322                 int len = user->ident.length();
 323                 in_addr newip;
 324
 325                 if(len == 8)
 326                         ident = user->ident.c_str();
 327                 else if(len == 9 && user->ident[0] == '~')
 328                         ident = user->ident.c_str() + 1;
 329                 else
 330                         return false;
 331
 332                 errno = 0;
 333                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 334                 if (errno)
 335                         return false;
 336                 newip.s_addr = htonl(ipaddr);
 337                 char* newipstr = inet_ntoa(newip);
 338
 339                 cmd.realhost.set(user, user->host);
 340                 cmd.realip.set(user, user->GetIPString());
 341                 ServerInstance->Users->RemoveCloneCounts(user);
 342                 user->SetClientIP(newipstr);
 343                 ServerInstance->Users->AddLocalClone(user);
 344                 ServerInstance->Users->AddGlobalClone(user);
 345                 user->SetClass();
 346                 user->CheckClass();
 347                 user->host = newipstr;
 348                 user->dhost = newipstr;
 349                 user->ident.assign("~cgiirc", 0, 8);
 350                 try
 351                 {
 352
 353                         bool cached;
 354                         CGIResolver* r = new CGIResolver(this, NotifyOpers, newipstr, false, user, "IDENT", cached);
 355                         ServerInstance->AddResolver(r, cached);
 356                 }
 357                 catch (...)
 358                 {
 359                         user->InvalidateCache();
 360
 361                         if(NotifyOpers)
 362                                  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());
 363                 }
 364
 365                 return true;
 366         }
 367
 368         bool IsValidHost(const std::string &host)
 369         {
 370                 if(!host.size() || host.size() > 64)
 371                         return false;
 372
 373                 for(unsigned int i = 0; i < host.size(); i++)
 374                 {
 375                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 376                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 377                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 378                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 379                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 380
 381                                 continue;
 382                         else
 383                                 return false;
 384                 }
 385
 386                 return true;
 387         }
 388
 389         bool IsValidIP(const std::string &ip)
 390         {
 391                 if(ip.size() < 7 || ip.size() > 15)
 392                         return false;
 393
 394                 short sincedot = 0;
 395                 short dots = 0;
 396
 397                 for(unsigned int i = 0; i < ip.size(); i++)
 398                 {
 399                         if((dots <= 3) && (sincedot <= 3))
 400                         {
 401                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 402                                 {
 403                                         sincedot++;
 404                                 }
 405                                 else if(ip[i] == '.')
 406                                 {
 407                                         sincedot = 0;
 408                                         dots++;
 409                                 }
 410                         }
 411                         else
 412                         {
 413                                 return false;
 414
 415                         }
 416                 }
 417
 418                 if(dots != 3)
 419                         return false;
 420
 421                 return true;
 422         }
 423
 424         virtual ~ModuleCgiIRC()
 425         {
 426         }
 427
 428         virtual Version GetVersion()
 429         {
 430                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
 431         }
 432
 433 };
 434
 435 MODULE_INIT(ModuleCgiIRC)