src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2004 ChatSpike-Dev.
   6  *                       E-mail:
   7  *               <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *               <omster@gmail.com>
  10  *
  11  * Written by Craig Edwards, Craig McLure, and others.
  12  * This program is free but copyrighted software; see
  13  *            the file COPYING for details.
  14  *
  15  * ---------------------------------------------------
  16  */
  17
  18 #include <vector>
  19 #include <string>
  20 #include <stdlib.h>
  21 #include <sys/socket.h>
  22 #include <netinet/in.h>
  23 #include <arpa/inet.h>
  24 #include "users.h"
  25 #include "modules.h"
  26 #include "helperfuncs.h"
  27 #include "dns.h"
  28 #include "inspircd.h"
  29
  30 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  31
  32 extern InspIRCd* ServerInstance;
  33
  34 enum CGItype { PASS, IDENT, PASSFIRST, IDENTFIRST };
  35
  36 class CGIhost : public classbase
  37 {
  38 public:
  39         std::string hostmask;
  40         CGItype type;
  41
  42         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST)
  43         : hostmask(mask), type(t)
  44         {
  45         }
  46 };
  47
  48 typedef std::vector<CGIhost> CGIHostlist;
  49
  50 class CGIResolver : public Resolver
  51 {
  52         std::string typ;
  53         int theirfd;
  54         userrec* them;
  55         bool notify;
  56  public:
  57         CGIResolver(bool NotifyOpers, const std::string &source, bool forward, userrec* u, int userfd, const std::string &type)
  58                 : Resolver(ServerInstance, source, forward ? DNS_QUERY_FORWARD : DNS_QUERY_REVERSE), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
  59
  60         virtual void OnLookupComplete(const std::string &result)
  61         {
  62                 /* Check the user still exists */
  63                 if ((them) && (them == ServerInstance->fd_ref_table[theirfd]))
  64                 {
  65                         if (notify)
  66                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", them->nick, them->host, result.c_str(), typ.c_str());
  67
  68                         strlcpy(them->host, result.c_str(), 63);
  69                         strlcpy(them->dhost, result.c_str(), 63);
  70                         strlcpy(them->ident, "~cgiirc", 8);
  71                 }
  72         }
  73
  74         virtual void OnError(ResolverError e, const std::string &errormessage)
  75         {
  76                 if ((them) && (them == ServerInstance->fd_ref_table[theirfd]))
  77                 {
  78                         if (notify)
  79                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but their host can't be resolved from their %s!", them->nick, them->host,typ.c_str());
  80                 }
  81         }
  82
  83         virtual ~CGIResolver()
  84         {
  85         }
  86 };
  87
  88 class ModuleCgiIRC : public Module
  89 {
  90         Server *Srv;
  91         bool NotifyOpers;
  92         CGIHostlist Hosts;
  93 public:
  94         ModuleCgiIRC(Server* Me) : Module::Module(Me)
  95         {
  96                 Srv = Me;
  97                 OnRehash("");
  98         }
  99
 100         void Implements(char* List)
 101         {
 102                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = 1;
 103         }
 104
 105         virtual Priority Prioritize()
 106         {
 107                 // We want to get here before m_cloaking and m_hostchange etc
 108                 return PRIORITY_FIRST;
 109         }
 110
 111         virtual void OnRehash(const std::string &parameter)
 112         {
 113                 ConfigReader Conf;
 114
 115                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 116
 117                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 118                         NotifyOpers = true;
 119
 120                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 121                 {
 122                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 123                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 124
 125                         if(hostmask.length())
 126                         {
 127                                 Hosts.push_back(CGIhost(hostmask));
 128
 129                                 if(type == "pass")
 130                                         Hosts.back().type = PASS;
 131                                 else if(type == "ident")
 132                                         Hosts.back().type = IDENT;
 133                                 else if(type == "passfirst")
 134                                         Hosts.back().type = PASSFIRST;
 135                         }
 136                         else
 137                         {
 138                                 log(DEBUG, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 139                                 continue;
 140                         }
 141                 }
 142         }
 143
 144         virtual void OnCleanup(int target_type, void* item)
 145         {
 146                 if(target_type == TYPE_USER)
 147                 {
 148                         userrec* user = (userrec*)item;
 149                         std::string* realhost;
 150                         std::string* realip;
 151
 152                         if(user->GetExt("cgiirc_realhost", realhost))
 153                         {
 154                                 delete realhost;
 155                                 user->Shrink("cgiirc_realhost");
 156                         }
 157
 158                         if(user->GetExt("cgiirc_realip", realip))
 159                         {
 160                                 delete realip;
 161                                 user->Shrink("cgiirc_realip");
 162                         }
 163                 }
 164         }
 165
 166         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 167         {
 168                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 169                 {
 170                         std::string* data;
 171
 172                         if(user->GetExt(extname, data))
 173                         {
 174                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 175                         }
 176                 }
 177         }
 178
 179         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 180         {
 181                 if(target_type == TYPE_USER)
 182                 {
 183                         userrec* dest = (userrec*)target;
 184                         std::string* bleh;
 185                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 186                         {
 187                                 dest->Extend(extname, new std::string(extdata));
 188                         }
 189                 }
 190         }
 191
 192         virtual void OnUserQuit(userrec* user, const std::string &message)
 193         {
 194                 OnCleanup(TYPE_USER, user);
 195         }
 196
 197
 198         virtual void OnUserRegister(userrec* user)
 199         {
 200                 log(DEBUG, "m_cgiirc.so: User %s registering, %s %s", user->nick,user->host,user->GetIPString());
 201
 202                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 203                 {
 204                         log(DEBUG, "m_cgiirc.so: Matching %s against (%s or %s)", iter->hostmask.c_str(), user->host, user->GetIPString());
 205
 206                         if(Srv->MatchText(user->host, iter->hostmask) || Srv->MatchText(user->GetIPString(), iter->hostmask))
 207                         {
 208                                 // Deal with it...
 209                                 log(DEBUG, "m_cgiirc.so: Handling CGI:IRC user: %s (%s) matched %s", user->GetFullRealHost(), user->GetIPString(), iter->hostmask.c_str());
 210
 211                                 if(iter->type == PASS)
 212                                 {
 213                                         CheckPass(user); // We do nothing if it fails so...
 214                                 }
 215                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 216                                 {
 217                                         // If the password lookup failed, try the ident
 218                                         CheckIdent(user);       // If this fails too, do nothing
 219                                 }
 220                                 else if(iter->type == IDENT)
 221                                 {
 222                                         CheckIdent(user); // Nothing on failure.
 223                                 }
 224                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 225                                 {
 226                                         // If the ident lookup fails, try the password.
 227                                         CheckPass(user);
 228                                 }
 229
 230                                 return;
 231                         }
 232                 }
 233         }
 234
 235         bool CheckPass(userrec* user)
 236         {
 237                 log(DEBUG, "m_cgiirc.so: CheckPass(%s) - %s", user->nick, user->password);
 238
 239                 if(IsValidHost(user->password))
 240                 {
 241                         user->Extend("cgiirc_realhost", new std::string(user->host));
 242                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 243                         strlcpy(user->host, user->password, 64);
 244                         strlcpy(user->dhost, user->password, 64);
 245
 246 #ifdef IPV6
 247                         if (insp_aton(user->password, (insp_inaddr*)&((sockaddr_in6*)&user->ip)->sin6_addr))
 248 #else
 249                         if (insp_aton(user->password, (insp_inaddr*)&((sockaddr_in*)&user->ip)->sin_addr))
 250 #endif
 251                         {
 252                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 253                                 log(DEBUG, "m_cgiirc.so: Got an IP in the user's password");
 254
 255                                 if(NotifyOpers)
 256                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 257                         }
 258                         else
 259                         {
 260                                 /* We got as resolved hostname in the password. */
 261                                 log(DEBUG, "m_cgiirc.so: Got a hostname in the user's password");
 262
 263                                 try
 264                                 {
 265                                         CGIResolver* r = new CGIResolver(NotifyOpers, user->password, false, user, user->fd, "PASS");
 266                                         Srv->AddResolver(r);
 267                                 }
 268                                 catch (ModuleException& e)
 269                                 {
 270                                         if (NotifyOpers)
 271                                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 272                                 }
 273                         }
 274
 275                         *user->password = 0;
 276
 277                         /*if(NotifyOpers)
 278                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 279
 280                         return true;
 281                 }
 282                 else
 283                 {
 284                         log(DEBUG, "m_cgiirc.so: User's password was not a valid host");
 285                 }
 286
 287                 return false;
 288         }
 289
 290         bool CheckIdent(userrec* user)
 291         {
 292                 int ip[4];
 293                 char* ident;
 294                 char newip[16];
 295                 int len = strlen(user->ident);
 296
 297                 if(len == 8)
 298                         ident = user->ident;
 299                 else if(len == 9 && *user->ident == '~')
 300                         ident = user->ident+1;
 301                 else
 302                         return false;
 303
 304                 for(int i = 0; i < 4; i++)
 305                         if(!HexToInt(ip[i], ident + i*2))
 306                                 return false;
 307
 308                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 309
 310                 user->Extend("cgiirc_realhost", new std::string(user->host));
 311                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 312 #ifdef IPV6
 313                 insp_aton(newip, (insp_inaddr*)&((sockaddr_in6*)&user->ip)->sin6_addr);
 314 #else
 315                 insp_aton(newip, (insp_inaddr*)&((sockaddr_in*)&user->ip)->sin_addr);
 316 #endif
 317
 318                 try
 319                 {
 320                         log(DEBUG,"MAKE RESOLVER: %s %d %s",newip, user->fd, "IDENT");
 321                         CGIResolver* r = new CGIResolver(NotifyOpers, newip, false, user, user->fd, "IDENT");
 322                         Srv->AddResolver(r);
 323                 }
 324                 catch (ModuleException& e)
 325                 {
 326                         strlcpy(user->host, newip, 16);
 327                         strlcpy(user->dhost, newip, 16);
 328                         strlcpy(user->ident, "~cgiirc", 8);
 329
 330                         if(NotifyOpers)
 331                                  ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 332                 }
 333                 /*strlcpy(user->host, newip, 16);
 334                 strlcpy(user->dhost, newip, 16);
 335                 strlcpy(user->ident, "~cgiirc", 8);*/
 336
 337                 return true;
 338         }
 339
 340         bool IsValidHost(const std::string &host)
 341         {
 342                 if(!host.size())
 343                         return false;
 344
 345                 for(unsigned int i = 0; i < host.size(); i++)
 346                 {
 347                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 348                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 349                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 350                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 351                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 352
 353                                 continue;
 354                         else
 355                                 return false;
 356                 }
 357
 358                 return true;
 359         }
 360
 361         bool IsValidIP(const std::string &ip)
 362         {
 363                 if(ip.size() < 7 || ip.size() > 15)
 364                         return false;
 365
 366                 short sincedot = 0;
 367                 short dots = 0;
 368
 369                 for(unsigned int i = 0; i < ip.size(); i++)
 370                 {
 371                         if((dots <= 3) && (sincedot <= 3))
 372                         {
 373                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 374                                 {
 375                                         sincedot++;
 376                                 }
 377                                 else if(ip[i] == '.')
 378                                 {
 379                                         sincedot = 0;
 380                                         dots++;
 381                                 }
 382                         }
 383                         else
 384                         {
 385                                 return false;
 386
 387                         }
 388                 }
 389
 390                 if(dots != 3)
 391                         return false;
 392
 393                 return true;
 394         }
 395
 396         bool HexToInt(int &out, const char* in)
 397         {
 398                 char ip[3];
 399                 ip[0] = in[0];
 400                 ip[1] = in[1];
 401                 ip[2] = 0;
 402                 out = strtol(ip, NULL, 16);
 403
 404                 if(out > 255 || out < 0)
 405                         return false;
 406
 407                 return true;
 408         }
 409
 410         virtual ~ModuleCgiIRC()
 411         {
 412         }
 413
 414         virtual Version GetVersion()
 415         {
 416                 return Version(1,0,0,0,VF_VENDOR);
 417         }
 418
 419 };
 420
 421 class ModuleCgiIRCFactory : public ModuleFactory
 422 {
 423  public:
 424         ModuleCgiIRCFactory()
 425         {
 426         }
 427
 428         ~ModuleCgiIRCFactory()
 429         {
 430         }
 431
 432         virtual Module * CreateModule(Server* Me)
 433         {
 434                 return new ModuleCgiIRC(Me);
 435         }
 436
 437 };
 438
 439
 440 extern "C" void * init_module( void )
 441 {
 442         return new ModuleCgiIRCFactory;
 443 }