src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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 : public classbase
  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                 CGIHostlist Hosts;
  59                 CommandWebirc(InspIRCd* Instance, bool bnotify) : Command(Instance, "WEBIRC", 0, 4, true), notify(bnotify)
  60                 {
  61                         this->source = "m_cgiirc.so";
  62                         this->syntax = "password client hostname ip";
  63                 }
  64                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  65                 {
  66                         if(user->registered == REG_ALL)
  67                                 return CMD_FAILURE;
  68
  69                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  70                         {
  71                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  72                                 {
  73                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  74                                         {
  75                                                 user->Extend("cgiirc_realhost", new std::string(user->host));
  76                                                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
  77                                                 if (notify)
  78                                                         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());
  79                                                 user->Extend("cgiirc_webirc_hostname", new std::string(parameters[2]));
  80                                                 user->Extend("cgiirc_webirc_ip", new std::string(parameters[3]));
  81                                                 return CMD_LOCALONLY;
  82                                         }
  83                                 }
  84                         }
  85
  86                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
  87                         return CMD_FAILURE;
  88                 }
  89 };
  90
  91
  92 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
  93  */
  94 class CGIResolver : public Resolver
  95 {
  96         std::string typ;
  97         int theirfd;
  98         User* them;
  99         bool notify;
 100  public:
 101         CGIResolver(Module* me, InspIRCd* Instance, bool NotifyOpers, const std::string &source, bool forward, User* u, int userfd, const std::string &type, bool &cached)
 102                 : Resolver(Instance, source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
 103
 104         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 105         {
 106                 /* Check the user still exists */
 107                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 108                 {
 109                         if (notify)
 110                                 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());
 111
 112                         them->host.assign(result,0, 64);
 113                         them->dhost.assign(result, 0, 64);
 114                         if (querytype)
 115                                 them->SetClientIP(result.c_str());
 116                         them->ident.assign("~cgiirc", 0, 8);
 117                         them->InvalidateCache();
 118                         them->CheckLines(true);
 119                 }
 120         }
 121
 122         virtual void OnError(ResolverError e, const std::string &errormessage)
 123         {
 124                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 125                 {
 126                         if (notify)
 127                                 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());
 128                 }
 129         }
 130
 131         virtual ~CGIResolver()
 132         {
 133         }
 134 };
 135
 136 class ModuleCgiIRC : public Module
 137 {
 138         CommandWebirc cmd;
 139         bool NotifyOpers;
 140 public:
 141         ModuleCgiIRC(InspIRCd* Me) : Module(Me), cmd(Me, NotifyOpers)
 142         {
 143                 OnRehash(NULL);
 144                 ServerInstance->AddCommand(&cmd);
 145
 146                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUser, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 147                 ServerInstance->Modules->Attach(eventlist, this, 7);
 148         }
 149
 150
 151         virtual void Prioritize()
 152         {
 153                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 154         }
 155
 156         virtual void OnRehash(User* user)
 157         {
 158                 ConfigReader Conf(ServerInstance);
 159                 cmd.Hosts.clear();
 160
 161                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 162
 163                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 164                         NotifyOpers = true;
 165
 166                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 167                 {
 168                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 169                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 170                         std::string password = Conf.ReadValue("cgihost", "password", i);
 171
 172                         if(hostmask.length())
 173                         {
 174                                 if (type == "webirc" && !password.length()) {
 175                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 176                                 }
 177                                 else
 178                                 {
 179                                         CGItype cgitype = INVALID;
 180                                         if (type == "pass")
 181                                                 cgitype = PASS;
 182                                         else if (type == "ident")
 183                                                 cgitype = IDENT;
 184                                         else if (type == "passfirst")
 185                                                 cgitype = PASSFIRST;
 186                                         else if (type == "webirc")
 187                                         {
 188                                                 cgitype = WEBIRC;
 189                                         }
 190
 191                                         if (cgitype == INVALID)
 192                                                 cgitype = PASS;
 193
 194                                         cmd.Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 195                                 }
 196                         }
 197                         else
 198                         {
 199                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 200                                 continue;
 201                         }
 202                 }
 203         }
 204
 205         virtual void OnCleanup(int target_type, void* item)
 206         {
 207                 if(target_type == TYPE_USER)
 208                 {
 209                         User* user = (User*)item;
 210                         std::string* realhost;
 211                         std::string* realip;
 212
 213                         if(user->GetExt("cgiirc_realhost", realhost))
 214                         {
 215                                 delete realhost;
 216                                 user->Shrink("cgiirc_realhost");
 217                         }
 218
 219                         if(user->GetExt("cgiirc_realip", realip))
 220                         {
 221                                 delete realip;
 222                                 user->Shrink("cgiirc_realip");
 223                         }
 224                 }
 225         }
 226
 227         virtual void OnSyncUser(User* user, Module* proto, void* opaque)
 228         {
 229                 std::string* data;
 230                 if (user->GetExt("cgiirc_realhost", data))
 231                         proto->ProtoSendMetaData(opaque, user, "cgiirc_realhost", *data);
 232                 if (user->GetExt("cgiirc_realip", data))
 233                         proto->ProtoSendMetaData(opaque, user, "cgiirc_realip", *data);
 234         }
 235
 236         virtual void OnDecodeMetaData(Extensible* target, const std::string &extname, const std::string &extdata)
 237         {
 238                 User* dest = dynamic_cast<User*>(target);
 239                 std::string* bleh;
 240                 if(dest && ((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 241                 {
 242                         dest->Extend(extname, new std::string(extdata));
 243                 }
 244         }
 245
 246         virtual void OnUserDisconnect(User* user)
 247         {
 248                 OnCleanup(TYPE_USER, user);
 249         }
 250
 251
 252         virtual int OnUserRegister(User* user)
 253         {
 254                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 255                 {
 256                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 257                         {
 258                                 // Deal with it...
 259                                 if(iter->type == PASS)
 260                                 {
 261                                         CheckPass(user); // We do nothing if it fails so...
 262                                         user->CheckLines(true);
 263                                 }
 264                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 265                                 {
 266                                         // If the password lookup failed, try the ident
 267                                         CheckIdent(user);       // If this fails too, do nothing
 268                                         user->CheckLines(true);
 269                                 }
 270                                 else if(iter->type == IDENT)
 271                                 {
 272                                         CheckIdent(user); // Nothing on failure.
 273                                         user->CheckLines(true);
 274                                 }
 275                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 276                                 {
 277                                         // If the ident lookup fails, try the password.
 278                                         CheckPass(user);
 279                                         user->CheckLines(true);
 280                                 }
 281                                 else if(iter->type == WEBIRC)
 282                                 {
 283                                         // We don't need to do anything here
 284                                 }
 285                                 return 0;
 286                         }
 287                 }
 288                 return 0;
 289         }
 290
 291         virtual void OnUserConnect(User* user)
 292         {
 293                 std::string *webirc_hostname, *webirc_ip;
 294                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 295                 {
 296                         user->host.assign(*webirc_hostname, 0, 64);
 297                         user->dhost.assign(*webirc_hostname, 0, 64);
 298                         delete webirc_hostname;
 299                         user->InvalidateCache();
 300                         user->Shrink("cgiirc_webirc_hostname");
 301                 }
 302                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 303                 {
 304                         ServerInstance->Users->RemoveCloneCounts(user);
 305                         user->SetClientIP(webirc_ip->c_str());
 306                         delete webirc_ip;
 307                         user->InvalidateCache();
 308                         user->Shrink("cgiirc_webirc_ip");
 309                         ServerInstance->Users->AddLocalClone(user);
 310                         ServerInstance->Users->AddGlobalClone(user);
 311                         user->CheckClass();
 312                         user->CheckLines(true);
 313                 }
 314         }
 315
 316         bool CheckPass(User* user)
 317         {
 318                 if(IsValidHost(user->password))
 319                 {
 320                         user->Extend("cgiirc_realhost", new std::string(user->host));
 321                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 322                         user->host.assign(user->password, 0, 64);
 323                         user->dhost.assign(user->password, 0, 64);
 324                         user->InvalidateCache();
 325
 326                         bool valid = false;
 327                         ServerInstance->Users->RemoveCloneCounts(user);
 328                         valid = user->SetClientIP(user->password.c_str());
 329                         ServerInstance->Users->AddLocalClone(user);
 330                         ServerInstance->Users->AddGlobalClone(user);
 331                         user->CheckClass();
 332
 333                         if (valid)
 334                         {
 335                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 336                                 if(NotifyOpers)
 337                                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick.c_str(), user->host.c_str(), user->password.c_str());
 338                         }
 339                         else
 340                         {
 341                                 /* We got as resolved hostname in the password. */
 342                                 try
 343                                 {
 344
 345                                         bool cached;
 346                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 347                                         ServerInstance->AddResolver(r, cached);
 348                                 }
 349                                 catch (...)
 350                                 {
 351                                         if (NotifyOpers)
 352                                                 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());
 353                                 }
 354                         }
 355
 356                         user->password.clear();
 357                         return true;
 358                 }
 359
 360                 return false;
 361         }
 362
 363         bool CheckIdent(User* user)
 364         {
 365                 const char* ident;
 366                 int len = user->ident.length();
 367                 in_addr newip;
 368
 369                 if(len == 8)
 370                         ident = user->ident.c_str();
 371                 else if(len == 9 && user->ident[0] == '~')
 372                         ident = user->ident.c_str() + 1;
 373                 else
 374                         return false;
 375
 376                 errno = 0;
 377                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 378                 if (errno)
 379                         return false;
 380                 newip.s_addr = htonl(ipaddr);
 381                 char* newipstr = inet_ntoa(newip);
 382
 383                 user->Extend("cgiirc_realhost", new std::string(user->host));
 384                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 385                 ServerInstance->Users->RemoveCloneCounts(user);
 386                 user->SetClientIP(newipstr);
 387                 ServerInstance->Users->AddLocalClone(user);
 388                 ServerInstance->Users->AddGlobalClone(user);
 389                 user->CheckClass();
 390                 user->host = newipstr;
 391                 user->dhost = newipstr;
 392                 user->ident.assign("~cgiirc", 0, 8);
 393                 try
 394                 {
 395
 396                         bool cached;
 397                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newipstr, false, user, user->GetFd(), "IDENT", cached);
 398                         ServerInstance->AddResolver(r, cached);
 399                 }
 400                 catch (...)
 401                 {
 402                         user->InvalidateCache();
 403
 404                         if(NotifyOpers)
 405                                  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());
 406                 }
 407
 408                 return true;
 409         }
 410
 411         bool IsValidHost(const std::string &host)
 412         {
 413                 if(!host.size())
 414                         return false;
 415
 416                 for(unsigned int i = 0; i < host.size(); i++)
 417                 {
 418                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 419                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 420                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 421                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 422                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 423
 424                                 continue;
 425                         else
 426                                 return false;
 427                 }
 428
 429                 return true;
 430         }
 431
 432         bool IsValidIP(const std::string &ip)
 433         {
 434                 if(ip.size() < 7 || ip.size() > 15)
 435                         return false;
 436
 437                 short sincedot = 0;
 438                 short dots = 0;
 439
 440                 for(unsigned int i = 0; i < ip.size(); i++)
 441                 {
 442                         if((dots <= 3) && (sincedot <= 3))
 443                         {
 444                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 445                                 {
 446                                         sincedot++;
 447                                 }
 448                                 else if(ip[i] == '.')
 449                                 {
 450                                         sincedot = 0;
 451                                         dots++;
 452                                 }
 453                         }
 454                         else
 455                         {
 456                                 return false;
 457
 458                         }
 459                 }
 460
 461                 if(dots != 3)
 462                         return false;
 463
 464                 return true;
 465         }
 466
 467         virtual ~ModuleCgiIRC()
 468         {
 469         }
 470
 471         virtual Version GetVersion()
 472         {
 473                 return Version("$Id$",VF_VENDOR,API_VERSION);
 474         }
 475
 476 };
 477
 478 MODULE_INIT(ModuleCgiIRC)