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  public:
  57         bool notify;
  58         StringExtItem realhost;
  59         StringExtItem realip;
  60         LocalStringExt webirc_hostname;
  61         LocalStringExt webirc_ip;
  62
  63         CGIHostlist Hosts;
  64         CommandWebirc(Module* Creator)
  65                 : Command(Creator, "WEBIRC", 4),
  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         LocalIntExt& waiting;
 107         bool notify;
 108  public:
 109         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, bool forward, LocalUser* u,
 110                         const std::string &type, bool &cached, LocalIntExt& ext)
 111                 : Resolver(source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theiruid(u->uuid),
 112                 waiting(ext), notify(NotifyOpers)
 113         {
 114         }
 115
 116         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 117         {
 118                 /* Check the user still exists */
 119                 User* them = ServerInstance->FindUUID(theiruid);
 120                 if (them)
 121                 {
 122                         if (notify)
 123                                 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());
 124
 125                         if (result.length() > 64)
 126                                 return;
 127                         them->host = result;
 128                         them->dhost = result;
 129                         them->InvalidateCache();
 130                         them->CheckLines(true);
 131                 }
 132         }
 133
 134         virtual void OnError(ResolverError e, const std::string &errormessage)
 135         {
 136                 User* them = ServerInstance->FindUUID(theiruid);
 137                 if (them)
 138                 {
 139                         if (notify)
 140                                 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());
 141                 }
 142         }
 143
 144         virtual ~CGIResolver()
 145         {
 146                 User* them = ServerInstance->FindUUID(theiruid);
 147                 if (!them)
 148                         return;
 149                 int count = waiting.get(them);
 150                 if (count)
 151                         waiting.set(them, count - 1);
 152         }
 153 };
 154
 155 class ModuleCgiIRC : public Module
 156 {
 157         CommandWebirc cmd;
 158         LocalIntExt waiting;
 159 public:
 160         ModuleCgiIRC() : cmd(this), waiting("cgiirc-delay", this)
 161         {
 162         }
 163
 164         void init()
 165         {
 166                 OnRehash(NULL);
 167                 ServerInstance->AddCommand(&cmd);
 168                 ServerInstance->Extensions.Register(&cmd.realhost);
 169                 ServerInstance->Extensions.Register(&cmd.realip);
 170                 ServerInstance->Extensions.Register(&cmd.webirc_hostname);
 171                 ServerInstance->Extensions.Register(&cmd.webirc_ip);
 172
 173                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCheckReady, I_OnUserConnect };
 174                 ServerInstance->Modules->Attach(eventlist, this, 4);
 175         }
 176
 177         void Prioritize()
 178         {
 179                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 180                 Module* umodes = ServerInstance->Modules->Find("m_conn_umodes.so");
 181                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_BEFORE, &umodes);
 182         }
 183
 184         void OnRehash(User* user)
 185         {
 186                 cmd.Hosts.clear();
 187
 188                 // Do we send an oper notice when a CGI:IRC has their host changed?
 189                 cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true);
 190
 191                 ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost");
 192                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 193                 {
 194                         ConfigTag* tag = i->second;
 195                         std::string hostmask = tag->getString("mask"); // An allowed CGI:IRC host
 196                         std::string type = tag->getString("type"); // What type of user-munging we do on this host.
 197                         std::string password = tag->getString("password");
 198
 199                         if(hostmask.length())
 200                         {
 201                                 if (type == "webirc" && !password.length()) {
 202                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 203                                 }
 204                                 else
 205                                 {
 206                                         CGItype cgitype = INVALID;
 207                                         if (type == "pass")
 208                                                 cgitype = PASS;
 209                                         else if (type == "ident")
 210                                                 cgitype = IDENT;
 211                                         else if (type == "passfirst")
 212                                                 cgitype = PASSFIRST;
 213                                         else if (type == "webirc")
 214                                         {
 215                                                 cgitype = WEBIRC;
 216                                         }
 217
 218                                         if (cgitype == INVALID)
 219                                                 cgitype = PASS;
 220
 221                                         cmd.Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 222                                 }
 223                         }
 224                         else
 225                         {
 226                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 227                                 continue;
 228                         }
 229                 }
 230         }
 231
 232         ModResult OnCheckReady(LocalUser *user)
 233         {
 234                 if (waiting.get(user))
 235                         return MOD_RES_DENY;
 236                 return MOD_RES_PASSTHRU;
 237         }
 238
 239         ModResult OnUserRegister(LocalUser* user)
 240         {
 241                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 242                 {
 243                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 244                         {
 245                                 // Deal with it...
 246                                 if(iter->type == PASS)
 247                                 {
 248                                         CheckPass(user); // We do nothing if it fails so...
 249                                         user->CheckLines(true);
 250                                 }
 251                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 252                                 {
 253                                         // If the password lookup failed, try the ident
 254                                         CheckIdent(user);       // If this fails too, do nothing
 255                                         user->CheckLines(true);
 256                                 }
 257                                 else if(iter->type == IDENT)
 258                                 {
 259                                         CheckIdent(user); // Nothing on failure.
 260                                         user->CheckLines(true);
 261                                 }
 262                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 263                                 {
 264                                         // If the ident lookup fails, try the password.
 265                                         CheckPass(user);
 266                                         user->CheckLines(true);
 267                                 }
 268                                 else if(iter->type == WEBIRC)
 269                                 {
 270                                         // We don't need to do anything here
 271                                 }
 272                                 return MOD_RES_PASSTHRU;
 273                         }
 274                 }
 275                 return MOD_RES_PASSTHRU;
 276         }
 277
 278         virtual void OnUserConnect(LocalUser* user)
 279         {
 280                 std::string *webirc_hostname = cmd.webirc_hostname.get(user);
 281                 std::string *webirc_ip = cmd.webirc_ip.get(user);
 282                 if (!webirc_ip)
 283                         return;
 284                 ServerInstance->Users->RemoveCloneCounts(user);
 285                 user->SetClientIP(webirc_ip->c_str());
 286                 user->InvalidateCache();
 287                 if (webirc_hostname && webirc_hostname->length() < 64)
 288                         user->host = user->dhost = *webirc_hostname;
 289                 else
 290                         user->host = user->dhost = user->GetIPString();
 291                 user->InvalidateCache();
 292                 ServerInstance->Users->AddLocalClone(user);
 293                 ServerInstance->Users->AddGlobalClone(user);
 294                 user->SetClass();
 295                 user->CheckClass();
 296                 user->CheckLines(true);
 297                 cmd.webirc_ip.unset(user);
 298                 cmd.webirc_hostname.unset(user);
 299         }
 300
 301         bool CheckPass(LocalUser* user)
 302         {
 303                 if(IsValidHost(user->password))
 304                 {
 305                         cmd.realhost.set(user, user->host);
 306                         cmd.realip.set(user, user->GetIPString());
 307                         user->host = user->password;
 308                         user->dhost = user->password;
 309                         user->InvalidateCache();
 310
 311                         ServerInstance->Users->RemoveCloneCounts(user);
 312                         user->SetClientIP(user->password.c_str());
 313                         ServerInstance->Users->AddLocalClone(user);
 314                         ServerInstance->Users->AddGlobalClone(user);
 315                         user->SetClass();
 316                         user->CheckClass();
 317
 318                         try
 319                         {
 320                                 bool cached;
 321                                 CGIResolver* r = new CGIResolver(this, cmd.notify, user->password, false, user, "PASS", cached, waiting);
 322                                 ServerInstance->AddResolver(r, cached);
 323                                 waiting.set(user, waiting.get(user) + 1);
 324                         }
 325                         catch (...)
 326                         {
 327                                 if (cmd.notify)
 328                                         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());
 329                         }
 330
 331                         user->password.clear();
 332                         return true;
 333                 }
 334
 335                 return false;
 336         }
 337
 338         bool CheckIdent(LocalUser* user)
 339         {
 340                 const char* ident;
 341                 int len = user->ident.length();
 342                 in_addr newip;
 343
 344                 if(len == 8)
 345                         ident = user->ident.c_str();
 346                 else if(len == 9 && user->ident[0] == '~')
 347                         ident = user->ident.c_str() + 1;
 348                 else
 349                         return false;
 350
 351                 errno = 0;
 352                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 353                 if (errno)
 354                         return false;
 355                 newip.s_addr = htonl(ipaddr);
 356                 char* newipstr = inet_ntoa(newip);
 357
 358                 cmd.realhost.set(user, user->host);
 359                 cmd.realip.set(user, user->GetIPString());
 360                 ServerInstance->Users->RemoveCloneCounts(user);
 361                 user->SetClientIP(newipstr);
 362                 ServerInstance->Users->AddLocalClone(user);
 363                 ServerInstance->Users->AddGlobalClone(user);
 364                 user->SetClass();
 365                 user->CheckClass();
 366                 user->host = newipstr;
 367                 user->dhost = newipstr;
 368                 user->ident.assign("~cgiirc", 0, 8);
 369                 try
 370                 {
 371
 372                         bool cached;
 373                         CGIResolver* r = new CGIResolver(this, cmd.notify, newipstr, false, user, "IDENT", cached, waiting);
 374                         ServerInstance->AddResolver(r, cached);
 375                         waiting.set(user, waiting.get(user) + 1);
 376                 }
 377                 catch (...)
 378                 {
 379                         user->InvalidateCache();
 380
 381                         if(cmd.notify)
 382                                  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());
 383                 }
 384
 385                 return true;
 386         }
 387
 388         bool IsValidHost(const std::string &host)
 389         {
 390                 if(!host.size() || host.size() > 64)
 391                         return false;
 392
 393                 for(unsigned int i = 0; i < host.size(); i++)
 394                 {
 395                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 396                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 397                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 398                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 399                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 400
 401                                 continue;
 402                         else
 403                                 return false;
 404                 }
 405
 406                 return true;
 407         }
 408
 409         bool IsValidIP(const std::string &ip)
 410         {
 411                 if(ip.size() < 7 || ip.size() > 15)
 412                         return false;
 413
 414                 short sincedot = 0;
 415                 short dots = 0;
 416
 417                 for(unsigned int i = 0; i < ip.size(); i++)
 418                 {
 419                         if((dots <= 3) && (sincedot <= 3))
 420                         {
 421                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 422                                 {
 423                                         sincedot++;
 424                                 }
 425                                 else if(ip[i] == '.')
 426                                 {
 427                                         sincedot = 0;
 428                                         dots++;
 429                                 }
 430                         }
 431                         else
 432                         {
 433                                 return false;
 434
 435                         }
 436                 }
 437
 438                 if(dots != 3)
 439                         return false;
 440
 441                 return true;
 442         }
 443
 444         virtual ~ModuleCgiIRC()
 445         {
 446         }
 447
 448         virtual Version GetVersion()
 449         {
 450                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
 451         }
 452
 453 };
 454
 455 MODULE_INIT(ModuleCgiIRC)