src/modules/m_cgiirc.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2008 John Brooks <john.brooks@dereferenced.net>
   6  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   7  *   Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
   8  *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
   9  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  10  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
  11  *
  12  * This file is part of InspIRCd.  InspIRCd is free software: you can
  13  * redistribute it and/or modify it under the terms of the GNU General Public
  14  * License as published by the Free Software Foundation, version 2.
  15  *
  16  * This program is distributed in the hope that it will be useful, but WITHOUT
  17  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  18  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25
  26 #include "inspircd.h"
  27 #include "xline.h"
  28
  29 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  30
  31 enum CGItype { PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
  32
  33
  34 /** Holds a CGI site's details
  35  */
  36 class CGIhost
  37 {
  38 public:
  39         std::string hostmask;
  40         CGItype type;
  41         std::string password;
  42
  43         CGIhost(const std::string &mask, CGItype t, const std::string &spassword)
  44         : hostmask(mask), type(t), password(spassword)
  45         {
  46         }
  47 };
  48 typedef std::vector<CGIhost> CGIHostlist;
  49
  50 /*
  51  * WEBIRC
  52  *  This is used for the webirc method of CGIIRC auth, and is (really) the best way to do these things.
  53  *  Syntax: WEBIRC password client hostname ip
  54  *  Where password is a shared key, client is the name of the "client" and version (e.g. cgiirc), hostname
  55  *  is the resolved host of the client issuing the command and IP is the real IP of the client.
  56  *
  57  * How it works:
  58  *  To tie in with the rest of cgiirc module, and to avoid race conditions, /webirc is only processed locally
  59  *  and simply sets metadata on the user, which is later decoded on full connect to give something meaningful.
  60  */
  61 class CommandWebirc : public Command
  62 {
  63  public:
  64         bool notify;
  65         StringExtItem realhost;
  66         StringExtItem realip;
  67         LocalStringExt webirc_hostname;
  68         LocalStringExt webirc_ip;
  69
  70         CGIHostlist Hosts;
  71         CommandWebirc(Module* Creator)
  72                 : Command(Creator, "WEBIRC", 4),
  73                   realhost("cgiirc_realhost", Creator), realip("cgiirc_realip", Creator),
  74                   webirc_hostname("cgiirc_webirc_hostname", Creator), webirc_ip("cgiirc_webirc_ip", Creator)
  75                 {
  76                         works_before_reg = true;
  77                         this->syntax = "password client hostname ip";
  78                 }
  79                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  80                 {
  81                         if(user->registered == REG_ALL)
  82                                 return CMD_FAILURE;
  83
  84                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  85                         {
  86                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  87                                 {
  88                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  89                                         {
  90                                                 realhost.set(user, user->host);
  91                                                 realip.set(user, user->GetIPString());
  92
  93                                                 bool host_ok = (parameters[2].length() < 64);
  94                                                 const std::string& newhost = (host_ok ? parameters[2] : parameters[3]);
  95
  96                                                 if (notify)
  97                                                         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(), newhost.c_str(), user->host.c_str());
  98
  99                                                 // Check if we're happy with the provided hostname. If it's problematic then make sure we won't set a host later, just the IP
 100                                                 if (host_ok)
 101                                                         webirc_hostname.set(user, parameters[2]);
 102                                                 else
 103                                                         webirc_hostname.unset(user);
 104
 105                                                 webirc_ip.set(user, parameters[3]);
 106                                                 return CMD_SUCCESS;
 107                                         }
 108                                 }
 109                         }
 110
 111                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
 112                         return CMD_FAILURE;
 113                 }
 114 };
 115
 116
 117 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
 118  */
 119 class CGIResolver : public Resolver
 120 {
 121         std::string typ;
 122         std::string theiruid;
 123         LocalIntExt& waiting;
 124         bool notify;
 125  public:
 126         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, LocalUser* u,
 127                         const std::string &type, bool &cached, LocalIntExt& ext)
 128                 : Resolver(source, DNS_QUERY_PTR4, cached, me), typ(type), theiruid(u->uuid),
 129                 waiting(ext), notify(NotifyOpers)
 130         {
 131         }
 132
 133         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 134         {
 135                 /* Check the user still exists */
 136                 User* them = ServerInstance->FindUUID(theiruid);
 137                 if ((them) && (!them->quitting))
 138                 {
 139                         LocalUser* lu = IS_LOCAL(them);
 140                         if (!lu)
 141                                 return;
 142
 143                         if (notify)
 144                                 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());
 145
 146                         if (result.length() > 64)
 147                                 return;
 148                         them->host = result;
 149                         them->dhost = result;
 150                         them->InvalidateCache();
 151                         lu->CheckLines(true);
 152                 }
 153         }
 154
 155         virtual void OnError(ResolverError e, const std::string &errormessage)
 156         {
 157                 if (!notify)
 158                         return;
 159
 160                 User* them = ServerInstance->FindUUID(theiruid);
 161                 if ((them) && (!them->quitting))
 162                 {
 163                         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());
 164                 }
 165         }
 166
 167         virtual ~CGIResolver()
 168         {
 169                 User* them = ServerInstance->FindUUID(theiruid);
 170                 if (!them)
 171                         return;
 172                 int count = waiting.get(them);
 173                 if (count)
 174                         waiting.set(them, count - 1);
 175         }
 176 };
 177
 178 class ModuleCgiIRC : public Module
 179 {
 180         CommandWebirc cmd;
 181         LocalIntExt waiting;
 182
 183         static void RecheckClass(LocalUser* user)
 184         {
 185                 user->MyClass = NULL;
 186                 user->SetClass();
 187                 user->CheckClass();
 188         }
 189
 190         static void ChangeIP(LocalUser* user, const std::string& newip)
 191         {
 192                 ServerInstance->Users->RemoveCloneCounts(user);
 193                 user->SetClientIP(newip.c_str());
 194                 ServerInstance->Users->AddLocalClone(user);
 195                 ServerInstance->Users->AddGlobalClone(user);
 196         }
 197
 198         void HandleIdentOrPass(LocalUser* user, const std::string& newip, bool was_pass)
 199         {
 200                 cmd.realhost.set(user, user->host);
 201                 cmd.realip.set(user, user->GetIPString());
 202                 ChangeIP(user, newip);
 203                 user->host = user->dhost = user->GetIPString();
 204                 user->InvalidateCache();
 205                 RecheckClass(user);
 206                 // Don't create the resolver if the core couldn't put the user in a connect class or when dns is disabled
 207                 if (user->quitting || ServerInstance->Config->NoUserDns)
 208                         return;
 209
 210                 try
 211                 {
 212                         bool cached;
 213                         CGIResolver* r = new CGIResolver(this, cmd.notify, newip, user, (was_pass ? "PASS" : "IDENT"), cached, waiting);
 214                         ServerInstance->AddResolver(r, cached);
 215                         waiting.set(user, waiting.get(user) + 1);
 216                 }
 217                 catch (...)
 218                 {
 219                         if (cmd.notify)
 220                                  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());
 221                 }
 222         }
 223
 224 public:
 225         ModuleCgiIRC() : cmd(this), waiting("cgiirc-delay", this)
 226         {
 227         }
 228
 229         void init()
 230         {
 231                 OnRehash(NULL);
 232                 ServiceProvider* providerlist[] = { &cmd, &cmd.realhost, &cmd.realip, &cmd.webirc_hostname, &cmd.webirc_ip, &waiting };
 233                 ServerInstance->Modules->AddServices(providerlist, sizeof(providerlist)/sizeof(ServiceProvider*));
 234
 235                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCheckReady };
 236                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 237         }
 238
 239         void OnRehash(User* user)
 240         {
 241                 cmd.Hosts.clear();
 242
 243                 // Do we send an oper notice when a CGI:IRC has their host changed?
 244                 cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true);
 245
 246                 ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost");
 247                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 248                 {
 249                         ConfigTag* tag = i->second;
 250                         std::string hostmask = tag->getString("mask"); // An allowed CGI:IRC host
 251                         std::string type = tag->getString("type"); // What type of user-munging we do on this host.
 252                         std::string password = tag->getString("password");
 253
 254                         if(hostmask.length())
 255                         {
 256                                 if (type == "webirc" && password.empty())
 257                                 {
 258                                         ServerInstance->Logs->Log("CONFIG",LOG_DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 259                                 }
 260                                 else
 261                                 {
 262                                         CGItype cgitype;
 263                                         if (type == "pass")
 264                                                 cgitype = PASS;
 265                                         else if (type == "ident")
 266                                                 cgitype = IDENT;
 267                                         else if (type == "passfirst")
 268                                                 cgitype = PASSFIRST;
 269                                         else if (type == "webirc")
 270                                                 cgitype = WEBIRC;
 271                                         else
 272                                         {
 273                                                 cgitype = PASS;
 274                                                 ServerInstance->Logs->Log("CONFIG",LOG_DEFAULT, "m_cgiirc.so: Invalid <cgihost:type> value in config: %s, setting it to \"pass\"", type.c_str());
 275                                         }
 276
 277                                         cmd.Hosts.push_back(CGIhost(hostmask, cgitype, password));
 278                                 }
 279                         }
 280                         else
 281                         {
 282                                 ServerInstance->Logs->Log("CONFIG",LOG_DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 283                                 continue;
 284                         }
 285                 }
 286         }
 287
 288         ModResult OnCheckReady(LocalUser *user)
 289         {
 290                 if (waiting.get(user))
 291                         return MOD_RES_DENY;
 292
 293                 std::string *webirc_ip = cmd.webirc_ip.get(user);
 294                 if (!webirc_ip)
 295                         return MOD_RES_PASSTHRU;
 296
 297                 ChangeIP(user, *webirc_ip);
 298
 299                 std::string* webirc_hostname = cmd.webirc_hostname.get(user);
 300                 user->host = user->dhost = (webirc_hostname ? *webirc_hostname : user->GetIPString());
 301
 302                 RecheckClass(user);
 303                 if (user->quitting)
 304                         return MOD_RES_DENY;
 305
 306                 user->CheckLines(true);
 307                 if (user->quitting)
 308                         return MOD_RES_DENY;
 309
 310                 cmd.webirc_hostname.unset(user);
 311                 cmd.webirc_ip.unset(user);
 312
 313                 return MOD_RES_PASSTHRU;
 314         }
 315
 316         ModResult OnUserRegister(LocalUser* user)
 317         {
 318                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 319                 {
 320                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 321                         {
 322                                 // Deal with it...
 323                                 if(iter->type == PASS)
 324                                 {
 325                                         CheckPass(user); // We do nothing if it fails so...
 326                                         user->CheckLines(true);
 327                                 }
 328                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 329                                 {
 330                                         // If the password lookup failed, try the ident
 331                                         CheckIdent(user);       // If this fails too, do nothing
 332                                         user->CheckLines(true);
 333                                 }
 334                                 else if(iter->type == IDENT)
 335                                 {
 336                                         CheckIdent(user); // Nothing on failure.
 337                                         user->CheckLines(true);
 338                                 }
 339                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 340                                 {
 341                                         // If the ident lookup fails, try the password.
 342                                         CheckPass(user);
 343                                         user->CheckLines(true);
 344                                 }
 345                                 else if(iter->type == WEBIRC)
 346                                 {
 347                                         // We don't need to do anything here
 348                                 }
 349                                 return MOD_RES_PASSTHRU;
 350                         }
 351                 }
 352                 return MOD_RES_PASSTHRU;
 353         }
 354
 355         bool CheckPass(LocalUser* user)
 356         {
 357                 if(IsValidHost(user->password))
 358                 {
 359                         HandleIdentOrPass(user, user->password, true);
 360                         user->password.clear();
 361                         return true;
 362                 }
 363
 364                 return false;
 365         }
 366
 367         bool CheckIdent(LocalUser* user)
 368         {
 369                 const char* ident;
 370                 in_addr newip;
 371
 372                 if (user->ident.length() == 8)
 373                         ident = user->ident.c_str();
 374                 else if (user->ident.length() == 9 && user->ident[0] == '~')
 375                         ident = user->ident.c_str() + 1;
 376                 else
 377                         return false;
 378
 379                 errno = 0;
 380                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 381                 if (errno)
 382                         return false;
 383                 newip.s_addr = htonl(ipaddr);
 384                 std::string newipstr(inet_ntoa(newip));
 385
 386                 user->ident = "~cgiirc";
 387                 HandleIdentOrPass(user, newipstr, false);
 388
 389                 return true;
 390         }
 391
 392         bool IsValidHost(const std::string &host)
 393         {
 394                 if(!host.size() || host.size() > 64)
 395                         return false;
 396
 397                 for(unsigned int i = 0; i < host.size(); i++)
 398                 {
 399                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 400                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 401                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 402                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 403                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 404
 405                                 continue;
 406                         else
 407                                 return false;
 408                 }
 409
 410                 return true;
 411         }
 412
 413         virtual Version GetVersion()
 414         {
 415                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
 416         }
 417
 418 };
 419
 420 MODULE_INIT(ModuleCgiIRC)