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                         allow_empty_last_param = false;
  77                         works_before_reg = true;
  78                         this->syntax = "password client hostname ip";
  79                 }
  80                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  81                 {
  82                         if(user->registered == REG_ALL)
  83                                 return CMD_FAILURE;
  84
  85                         irc::sockets::sockaddrs ipaddr;
  86                         if (!irc::sockets::aptosa(parameters[3], 0, ipaddr))
  87                         {
  88                                 ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC but gave an invalid IP address.", user->GetFullRealHost().c_str());
  89                                 return CMD_FAILURE;
  90                         }
  91
  92                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  93                         {
  94                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  95                                 {
  96                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  97                                         {
  98                                                 realhost.set(user, user->host);
  99                                                 realip.set(user, user->GetIPString());
 100
 101                                                 bool host_ok = (parameters[2].length() < 64);
 102                                                 const std::string& newhost = (host_ok ? parameters[2] : parameters[3]);
 103
 104                                                 if (notify)
 105                                                         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());
 106
 107                                                 // 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
 108                                                 if (host_ok)
 109                                                         webirc_hostname.set(user, parameters[2]);
 110                                                 else
 111                                                         webirc_hostname.unset(user);
 112
 113                                                 webirc_ip.set(user, parameters[3]);
 114                                                 return CMD_SUCCESS;
 115                                         }
 116                                 }
 117                         }
 118
 119                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
 120                         return CMD_FAILURE;
 121                 }
 122 };
 123
 124
 125 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
 126  */
 127 class CGIResolver : public Resolver
 128 {
 129         std::string typ;
 130         std::string theiruid;
 131         LocalIntExt& waiting;
 132         bool notify;
 133  public:
 134         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, LocalUser* u,
 135                         const std::string &type, bool &cached, LocalIntExt& ext)
 136                 : Resolver(source, DNS_QUERY_PTR4, cached, me), typ(type), theiruid(u->uuid),
 137                 waiting(ext), notify(NotifyOpers)
 138         {
 139         }
 140
 141         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 142         {
 143                 /* Check the user still exists */
 144                 User* them = ServerInstance->FindUUID(theiruid);
 145                 if ((them) && (!them->quitting))
 146                 {
 147                         if (notify)
 148                                 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());
 149
 150                         if (result.length() > 64)
 151                                 return;
 152                         them->host = result;
 153                         them->dhost = result;
 154                         them->InvalidateCache();
 155                         them->CheckLines(true);
 156                 }
 157         }
 158
 159         virtual void OnError(ResolverError e, const std::string &errormessage)
 160         {
 161                 if (!notify)
 162                         return;
 163
 164                 User* them = ServerInstance->FindUUID(theiruid);
 165                 if ((them) && (!them->quitting))
 166                 {
 167                         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());
 168                 }
 169         }
 170
 171         virtual ~CGIResolver()
 172         {
 173                 User* them = ServerInstance->FindUUID(theiruid);
 174                 if (!them)
 175                         return;
 176                 int count = waiting.get(them);
 177                 if (count)
 178                         waiting.set(them, count - 1);
 179         }
 180 };
 181
 182 class ModuleCgiIRC : public Module
 183 {
 184         CommandWebirc cmd;
 185         LocalIntExt waiting;
 186
 187         static void RecheckClass(LocalUser* user)
 188         {
 189                 user->MyClass = NULL;
 190                 user->SetClass();
 191                 user->CheckClass();
 192         }
 193
 194         static void ChangeIP(LocalUser* user, const std::string& newip)
 195         {
 196                 ServerInstance->Users->RemoveCloneCounts(user);
 197                 user->SetClientIP(newip.c_str());
 198                 ServerInstance->Users->AddLocalClone(user);
 199                 ServerInstance->Users->AddGlobalClone(user);
 200         }
 201
 202         void HandleIdentOrPass(LocalUser* user, const std::string& newip, bool was_pass)
 203         {
 204                 cmd.realhost.set(user, user->host);
 205                 cmd.realip.set(user, user->GetIPString());
 206                 ChangeIP(user, newip);
 207                 user->host = user->dhost = user->GetIPString();
 208                 user->InvalidateCache();
 209                 RecheckClass(user);
 210                 // Don't create the resolver if the core couldn't put the user in a connect class or when dns is disabled
 211                 if (user->quitting || ServerInstance->Config->NoUserDns)
 212                         return;
 213
 214                 try
 215                 {
 216                         bool cached;
 217                         CGIResolver* r = new CGIResolver(this, cmd.notify, newip, user, (was_pass ? "PASS" : "IDENT"), cached, waiting);
 218                         waiting.set(user, waiting.get(user) + 1);
 219                         ServerInstance->AddResolver(r, cached);
 220                 }
 221                 catch (...)
 222                 {
 223                         if (cmd.notify)
 224                                  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());
 225                 }
 226         }
 227
 228 public:
 229         ModuleCgiIRC() : cmd(this), waiting("cgiirc-delay", this)
 230         {
 231         }
 232
 233         void init()
 234         {
 235                 OnRehash(NULL);
 236                 ServiceProvider* providerlist[] = { &cmd, &cmd.realhost, &cmd.realip, &cmd.webirc_hostname, &cmd.webirc_ip, &waiting };
 237                 ServerInstance->Modules->AddServices(providerlist, sizeof(providerlist)/sizeof(ServiceProvider*));
 238
 239                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCheckReady };
 240                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 241         }
 242
 243         void OnRehash(User* user)
 244         {
 245                 cmd.Hosts.clear();
 246
 247                 // Do we send an oper notice when a CGI:IRC has their host changed?
 248                 cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true);
 249
 250                 ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost");
 251                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 252                 {
 253                         ConfigTag* tag = i->second;
 254                         std::string hostmask = tag->getString("mask"); // An allowed CGI:IRC host
 255                         std::string type = tag->getString("type"); // What type of user-munging we do on this host.
 256                         std::string password = tag->getString("password");
 257
 258                         if(hostmask.length())
 259                         {
 260                                 if (type == "webirc" && password.empty())
 261                                 {
 262                                         ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 263                                 }
 264                                 else
 265                                 {
 266                                         CGItype cgitype;
 267                                         if (type == "pass")
 268                                                 cgitype = PASS;
 269                                         else if (type == "ident")
 270                                                 cgitype = IDENT;
 271                                         else if (type == "passfirst")
 272                                                 cgitype = PASSFIRST;
 273                                         else if (type == "webirc")
 274                                                 cgitype = WEBIRC;
 275                                         else
 276                                         {
 277                                                 cgitype = PASS;
 278                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:type> value in config: %s, setting it to \"pass\"", type.c_str());
 279                                         }
 280
 281                                         cmd.Hosts.push_back(CGIhost(hostmask, cgitype, password));
 282                                 }
 283                         }
 284                         else
 285                         {
 286                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 287                                 continue;
 288                         }
 289                 }
 290         }
 291
 292         ModResult OnCheckReady(LocalUser *user)
 293         {
 294                 if (waiting.get(user))
 295                         return MOD_RES_DENY;
 296
 297                 std::string *webirc_ip = cmd.webirc_ip.get(user);
 298                 if (!webirc_ip)
 299                         return MOD_RES_PASSTHRU;
 300
 301                 ChangeIP(user, *webirc_ip);
 302
 303                 std::string* webirc_hostname = cmd.webirc_hostname.get(user);
 304                 user->host = user->dhost = (webirc_hostname ? *webirc_hostname : user->GetIPString());
 305                 user->InvalidateCache();
 306
 307                 RecheckClass(user);
 308                 if (user->quitting)
 309                         return MOD_RES_DENY;
 310
 311                 user->CheckLines(true);
 312                 if (user->quitting)
 313                         return MOD_RES_DENY;
 314
 315                 cmd.webirc_hostname.unset(user);
 316                 cmd.webirc_ip.unset(user);
 317
 318                 return MOD_RES_PASSTHRU;
 319         }
 320
 321         ModResult OnUserRegister(LocalUser* user)
 322         {
 323                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 324                 {
 325                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 326                         {
 327                                 // Deal with it...
 328                                 if(iter->type == PASS)
 329                                 {
 330                                         CheckPass(user); // We do nothing if it fails so...
 331                                         user->CheckLines(true);
 332                                 }
 333                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 334                                 {
 335                                         // If the password lookup failed, try the ident
 336                                         CheckIdent(user);       // If this fails too, do nothing
 337                                         user->CheckLines(true);
 338                                 }
 339                                 else if(iter->type == IDENT)
 340                                 {
 341                                         CheckIdent(user); // Nothing on failure.
 342                                         user->CheckLines(true);
 343                                 }
 344                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 345                                 {
 346                                         // If the ident lookup fails, try the password.
 347                                         CheckPass(user);
 348                                         user->CheckLines(true);
 349                                 }
 350                                 else if(iter->type == WEBIRC)
 351                                 {
 352                                         // We don't need to do anything here
 353                                 }
 354                                 return MOD_RES_PASSTHRU;
 355                         }
 356                 }
 357                 return MOD_RES_PASSTHRU;
 358         }
 359
 360         bool CheckPass(LocalUser* user)
 361         {
 362                 if(IsValidHost(user->password))
 363                 {
 364                         HandleIdentOrPass(user, user->password, true);
 365                         user->password.clear();
 366                         return true;
 367                 }
 368
 369                 return false;
 370         }
 371
 372         bool CheckIdent(LocalUser* user)
 373         {
 374                 const char* ident;
 375                 in_addr newip;
 376
 377                 if (user->ident.length() == 8)
 378                         ident = user->ident.c_str();
 379                 else if (user->ident.length() == 9 && user->ident[0] == '~')
 380                         ident = user->ident.c_str() + 1;
 381                 else
 382                         return false;
 383
 384                 errno = 0;
 385                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 386                 if (errno)
 387                         return false;
 388                 newip.s_addr = htonl(ipaddr);
 389                 std::string newipstr(inet_ntoa(newip));
 390
 391                 user->ident = "~cgiirc";
 392                 HandleIdentOrPass(user, newipstr, false);
 393
 394                 return true;
 395         }
 396
 397         bool IsValidHost(const std::string &host)
 398         {
 399                 if(!host.size() || host.size() > 64)
 400                         return false;
 401
 402                 for(unsigned int i = 0; i < host.size(); i++)
 403                 {
 404                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 405                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 406                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 407                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 408                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 409
 410                                 continue;
 411                         else
 412                                 return false;
 413                 }
 414
 415                 return true;
 416         }
 417
 418         virtual Version GetVersion()
 419         {
 420                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
 421         }
 422
 423 };
 424
 425 MODULE_INIT(ModuleCgiIRC)