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                                 IS_LOCAL(user)->CommandFloodPenalty += 5000;
  89                                 ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC but gave an invalid IP address.", user->GetFullRealHost().c_str());
  90                                 return CMD_FAILURE;
  91                         }
  92
  93                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  94                         {
  95                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  96                                 {
  97                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  98                                         {
  99                                                 realhost.set(user, user->host);
 100                                                 realip.set(user, user->GetIPString());
 101
 102                                                 bool host_ok = (parameters[2].length() < 64);
 103                                                 const std::string& newhost = (host_ok ? parameters[2] : parameters[3]);
 104
 105                                                 if (notify)
 106                                                         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());
 107
 108                                                 // 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
 109                                                 if (host_ok)
 110                                                         webirc_hostname.set(user, parameters[2]);
 111                                                 else
 112                                                         webirc_hostname.unset(user);
 113
 114                                                 webirc_ip.set(user, parameters[3]);
 115                                                 return CMD_SUCCESS;
 116                                         }
 117                                 }
 118                         }
 119
 120                         IS_LOCAL(user)->CommandFloodPenalty += 5000;
 121                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
 122                         return CMD_FAILURE;
 123                 }
 124 };
 125
 126
 127 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
 128  */
 129 class CGIResolver : public Resolver
 130 {
 131         std::string typ;
 132         std::string theiruid;
 133         LocalIntExt& waiting;
 134         bool notify;
 135  public:
 136         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, LocalUser* u,
 137                         const std::string &type, bool &cached, LocalIntExt& ext)
 138                 : Resolver(source, DNS_QUERY_PTR4, cached, me), typ(type), theiruid(u->uuid),
 139                 waiting(ext), notify(NotifyOpers)
 140         {
 141         }
 142
 143         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 144         {
 145                 /* Check the user still exists */
 146                 User* them = ServerInstance->FindUUID(theiruid);
 147                 if ((them) && (!them->quitting))
 148                 {
 149                         if (notify)
 150                                 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());
 151
 152                         if (result.length() > 64)
 153                                 return;
 154                         them->host = result;
 155                         them->dhost = result;
 156                         them->InvalidateCache();
 157                         them->CheckLines(true);
 158                 }
 159         }
 160
 161         virtual void OnError(ResolverError e, const std::string &errormessage)
 162         {
 163                 if (!notify)
 164                         return;
 165
 166                 User* them = ServerInstance->FindUUID(theiruid);
 167                 if ((them) && (!them->quitting))
 168                 {
 169                         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());
 170                 }
 171         }
 172
 173         virtual ~CGIResolver()
 174         {
 175                 User* them = ServerInstance->FindUUID(theiruid);
 176                 if (!them)
 177                         return;
 178                 int count = waiting.get(them);
 179                 if (count)
 180                         waiting.set(them, count - 1);
 181         }
 182 };
 183
 184 class ModuleCgiIRC : public Module
 185 {
 186         CommandWebirc cmd;
 187         LocalIntExt waiting;
 188
 189         static void RecheckClass(LocalUser* user)
 190         {
 191                 user->MyClass = NULL;
 192                 user->SetClass();
 193                 user->CheckClass();
 194         }
 195
 196         static void ChangeIP(LocalUser* user, const std::string& newip)
 197         {
 198                 ServerInstance->Users->RemoveCloneCounts(user);
 199                 user->SetClientIP(newip.c_str());
 200                 ServerInstance->Users->AddLocalClone(user);
 201                 ServerInstance->Users->AddGlobalClone(user);
 202         }
 203
 204         void HandleIdentOrPass(LocalUser* user, const std::string& newip, bool was_pass)
 205         {
 206                 cmd.realhost.set(user, user->host);
 207                 cmd.realip.set(user, user->GetIPString());
 208                 ChangeIP(user, newip);
 209                 user->host = user->dhost = user->GetIPString();
 210                 user->InvalidateCache();
 211                 RecheckClass(user);
 212                 // Don't create the resolver if the core couldn't put the user in a connect class or when dns is disabled
 213                 if (user->quitting || ServerInstance->Config->NoUserDns)
 214                         return;
 215
 216                 try
 217                 {
 218                         bool cached;
 219                         CGIResolver* r = new CGIResolver(this, cmd.notify, newip, user, (was_pass ? "PASS" : "IDENT"), cached, waiting);
 220                         waiting.set(user, waiting.get(user) + 1);
 221                         ServerInstance->AddResolver(r, cached);
 222                 }
 223                 catch (...)
 224                 {
 225                         if (cmd.notify)
 226                                  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());
 227                 }
 228         }
 229
 230 public:
 231         ModuleCgiIRC() : cmd(this), waiting("cgiirc-delay", this)
 232         {
 233         }
 234
 235         void init()
 236         {
 237                 OnRehash(NULL);
 238                 ServiceProvider* providerlist[] = { &cmd, &cmd.realhost, &cmd.realip, &cmd.webirc_hostname, &cmd.webirc_ip, &waiting };
 239                 ServerInstance->Modules->AddServices(providerlist, sizeof(providerlist)/sizeof(ServiceProvider*));
 240
 241                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCheckReady };
 242                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 243         }
 244
 245         void OnRehash(User* user)
 246         {
 247                 cmd.Hosts.clear();
 248
 249                 // Do we send an oper notice when a CGI:IRC has their host changed?
 250                 cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true);
 251
 252                 ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost");
 253                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 254                 {
 255                         ConfigTag* tag = i->second;
 256                         std::string hostmask = tag->getString("mask"); // An allowed CGI:IRC host
 257                         std::string type = tag->getString("type"); // What type of user-munging we do on this host.
 258                         std::string password = tag->getString("password");
 259
 260                         if(hostmask.length())
 261                         {
 262                                 if (type == "webirc" && password.empty())
 263                                 {
 264                                         ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 265                                 }
 266                                 else
 267                                 {
 268                                         CGItype cgitype;
 269                                         if (type == "pass")
 270                                                 cgitype = PASS;
 271                                         else if (type == "ident")
 272                                                 cgitype = IDENT;
 273                                         else if (type == "passfirst")
 274                                                 cgitype = PASSFIRST;
 275                                         else if (type == "webirc")
 276                                                 cgitype = WEBIRC;
 277                                         else
 278                                         {
 279                                                 cgitype = PASS;
 280                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:type> value in config: %s, setting it to \"pass\"", type.c_str());
 281                                         }
 282
 283                                         cmd.Hosts.push_back(CGIhost(hostmask, cgitype, password));
 284                                 }
 285                         }
 286                         else
 287                         {
 288                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 289                                 continue;
 290                         }
 291                 }
 292         }
 293
 294         ModResult OnCheckReady(LocalUser *user)
 295         {
 296                 if (waiting.get(user))
 297                         return MOD_RES_DENY;
 298
 299                 std::string *webirc_ip = cmd.webirc_ip.get(user);
 300                 if (!webirc_ip)
 301                         return MOD_RES_PASSTHRU;
 302
 303                 ChangeIP(user, *webirc_ip);
 304
 305                 std::string* webirc_hostname = cmd.webirc_hostname.get(user);
 306                 user->host = user->dhost = (webirc_hostname ? *webirc_hostname : user->GetIPString());
 307                 user->InvalidateCache();
 308
 309                 RecheckClass(user);
 310                 if (user->quitting)
 311                         return MOD_RES_DENY;
 312
 313                 user->CheckLines(true);
 314                 if (user->quitting)
 315                         return MOD_RES_DENY;
 316
 317                 cmd.webirc_hostname.unset(user);
 318                 cmd.webirc_ip.unset(user);
 319
 320                 return MOD_RES_PASSTHRU;
 321         }
 322
 323         ModResult OnUserRegister(LocalUser* user)
 324         {
 325                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 326                 {
 327                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 328                         {
 329                                 // Deal with it...
 330                                 if(iter->type == PASS)
 331                                 {
 332                                         CheckPass(user); // We do nothing if it fails so...
 333                                         user->CheckLines(true);
 334                                 }
 335                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 336                                 {
 337                                         // If the password lookup failed, try the ident
 338                                         CheckIdent(user);       // If this fails too, do nothing
 339                                         user->CheckLines(true);
 340                                 }
 341                                 else if(iter->type == IDENT)
 342                                 {
 343                                         CheckIdent(user); // Nothing on failure.
 344                                         user->CheckLines(true);
 345                                 }
 346                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 347                                 {
 348                                         // If the ident lookup fails, try the password.
 349                                         CheckPass(user);
 350                                         user->CheckLines(true);
 351                                 }
 352                                 else if(iter->type == WEBIRC)
 353                                 {
 354                                         // We don't need to do anything here
 355                                 }
 356                                 return MOD_RES_PASSTHRU;
 357                         }
 358                 }
 359                 return MOD_RES_PASSTHRU;
 360         }
 361
 362         bool CheckPass(LocalUser* user)
 363         {
 364                 if(IsValidHost(user->password))
 365                 {
 366                         HandleIdentOrPass(user, user->password, true);
 367                         user->password.clear();
 368                         return true;
 369                 }
 370
 371                 return false;
 372         }
 373
 374         bool CheckIdent(LocalUser* user)
 375         {
 376                 const char* ident;
 377                 in_addr newip;
 378
 379                 if (user->ident.length() == 8)
 380                         ident = user->ident.c_str();
 381                 else if (user->ident.length() == 9 && user->ident[0] == '~')
 382                         ident = user->ident.c_str() + 1;
 383                 else
 384                         return false;
 385
 386                 errno = 0;
 387                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 388                 if (errno)
 389                         return false;
 390                 newip.s_addr = htonl(ipaddr);
 391                 std::string newipstr(inet_ntoa(newip));
 392
 393                 user->ident = "~cgiirc";
 394                 HandleIdentOrPass(user, newipstr, false);
 395
 396                 return true;
 397         }
 398
 399         bool IsValidHost(const std::string &host)
 400         {
 401                 if(!host.size() || host.size() > 64)
 402                         return false;
 403
 404                 for(unsigned int i = 0; i < host.size(); i++)
 405                 {
 406                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 407                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 408                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 409                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 410                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 411
 412                                 continue;
 413                         else
 414                                 return false;
 415                 }
 416
 417                 return true;
 418         }
 419
 420         virtual Version GetVersion()
 421         {
 422                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
 423         }
 424
 425 };
 426
 427 MODULE_INIT(ModuleCgiIRC)