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
  29 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  30
  31
  32 /* We need this for checking our user hasnt /quit before we finish our lookup */
  33 extern userrec* fd_ref_table[MAX_DESCRIPTORS];
  34
  35 enum CGItype { PASS, IDENT, PASSFIRST, IDENTFIRST };
  36
  37 class CGIhost : public classbase
  38 {
  39 public:
  40         std::string hostmask;
  41         CGItype type;
  42
  43         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST)
  44         : hostmask(mask), type(t)
  45         {
  46         }
  47 };
  48
  49 typedef std::vector<CGIhost> CGIHostlist;
  50
  51 class CGIResolver : public Resolver
  52 {
  53         std::string typ;
  54         int theirfd;
  55         userrec* them;
  56         bool notify;
  57  public:
  58         CGIResolver(bool NotifyOpers, const std::string &source, bool forward, userrec* u, int userfd, const std::string &type)
  59                 : Resolver(source, forward, ""), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
  60
  61         virtual void OnLookupComplete(const std::string &result)
  62         {
  63                 /* Check the user still exists */
  64                 if ((them) && (them == fd_ref_table[theirfd]))
  65                 {
  66                         if (notify)
  67                                 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());
  68
  69                         strlcpy(them->host, result.c_str(), 16);
  70                         strlcpy(them->dhost, result.c_str(), 16);
  71                         strlcpy(them->ident, "~cgiirc", 8);
  72                 }
  73         }
  74
  75         virtual ~CGIResolver()
  76         {
  77         }
  78 };
  79
  80 class ModuleCgiIRC : public Module
  81 {
  82         Server *Srv;
  83         bool NotifyOpers;
  84         CGIHostlist Hosts;
  85 public:
  86         ModuleCgiIRC(Server* Me) : Module::Module(Me)
  87         {
  88                 Srv = Me;
  89                 OnRehash("");
  90         }
  91
  92         void Implements(char* List)
  93         {
  94                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = 1;
  95         }
  96
  97         virtual Priority Prioritize()
  98         {
  99                 // We want to get here before m_cloaking and m_hostchange etc
 100                 return PRIORITY_FIRST;
 101         }
 102
 103         virtual void OnRehash(const std::string &parameter)
 104         {
 105                 ConfigReader Conf;
 106
 107                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 108
 109                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 110                         NotifyOpers = true;
 111
 112                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 113                 {
 114                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 115                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 116
 117                         if(hostmask.length())
 118                         {
 119                                 Hosts.push_back(CGIhost(hostmask));
 120
 121                                 if(type == "pass")
 122                                         Hosts.back().type = PASS;
 123                                 else if(type == "ident")
 124                                         Hosts.back().type = IDENT;
 125                                 else if(type == "passfirst")
 126                                         Hosts.back().type = PASSFIRST;
 127                         }
 128                         else
 129                         {
 130                                 log(DEBUG, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 131                                 continue;
 132                         }
 133                 }
 134         }
 135
 136         virtual void OnCleanup(int target_type, void* item)
 137         {
 138                 if(target_type == TYPE_USER)
 139                 {
 140                         userrec* user = (userrec*)item;
 141                         std::string* realhost;
 142                         std::string* realip;
 143
 144                         if(user->GetExt("cgiirc_realhost", realhost))
 145                         {
 146                                 delete realhost;
 147                                 user->Shrink("cgiirc_realhost");
 148                         }
 149
 150                         if(user->GetExt("cgiirc_realip", realip))
 151                         {
 152                                 delete realip;
 153                                 user->Shrink("cgiirc_realip");
 154                         }
 155                 }
 156         }
 157
 158         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 159         {
 160                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 161                 {
 162                         std::string* data;
 163
 164                         if(user->GetExt(extname, data))
 165                         {
 166                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 167                         }
 168                 }
 169         }
 170
 171         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 172         {
 173                 if(target_type == TYPE_USER)
 174                 {
 175                         userrec* dest = (userrec*)target;
 176                         std::string* bleh;
 177                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 178                         {
 179                                 dest->Extend(extname, new std::string(extdata));
 180                         }
 181                 }
 182         }
 183
 184         virtual void OnUserQuit(userrec* user, const std::string &message)
 185         {
 186                 OnCleanup(TYPE_USER, user);
 187         }
 188
 189
 190         virtual void OnUserRegister(userrec* user)
 191         {
 192                 log(DEBUG, "m_cgiirc.so: User %s registering", user->nick);
 193
 194                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 195                 {
 196                         log(DEBUG, "m_cgiirc.so: Matching %s against (%s or %s)", iter->hostmask.c_str(), user->host, inet_ntoa(user->ip4));
 197
 198                         if(Srv->MatchText(user->host, iter->hostmask) || Srv->MatchText(inet_ntoa(user->ip4), iter->hostmask))
 199                         {
 200                                 // Deal with it...
 201                                 log(DEBUG, "m_cgiirc.so: Handling CGI:IRC user: %s (%s) matched %s", user->GetFullRealHost(), inet_ntoa(user->ip4), iter->hostmask.c_str());
 202
 203                                 if(iter->type == PASS)
 204                                 {
 205                                         CheckPass(user); // We do nothing if it fails so...
 206                                 }
 207                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 208                                 {
 209                                         // If the password lookup failed, try the ident
 210                                         CheckIdent(user);       // If this fails too, do nothing
 211                                 }
 212                                 else if(iter->type == IDENT)
 213                                 {
 214                                         CheckIdent(user); // Nothing on failure.
 215                                 }
 216                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 217                                 {
 218                                         // If the ident lookup fails, try the password.
 219                                         CheckPass(user);
 220                                 }
 221
 222                                 return;
 223                         }
 224                 }
 225         }
 226
 227         bool CheckPass(userrec* user)
 228         {
 229                 log(DEBUG, "m_cgiirc.so: CheckPass(%s) - %s", user->nick, user->password);
 230
 231                 if(IsValidHost(user->password))
 232                 {
 233                         user->Extend("cgiirc_realhost", new std::string(user->host));
 234                         user->Extend("cgiirc_realip", new std::string(inet_ntoa(user->ip4)));
 235                         strlcpy(user->host, user->password, 64);
 236                         strlcpy(user->dhost, user->password, 64);
 237
 238                         if(inet_aton(user->password, &user->ip4))
 239                         {
 240                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 241                                 log(DEBUG, "m_cgiirc.so: Got an IP in the user's password");
 242
 243                                 if(NotifyOpers)
 244                                         WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 245                         }
 246                         else
 247                         {
 248                                 /* We got as resolved hostname in the password. */
 249                                 log(DEBUG, "m_cgiirc.so: Got a hostname in the user's password");
 250
 251                                 try
 252                                 {
 253                                         CGIResolver* r = new CGIResolver(NotifyOpers, user->password, false, user, user->fd, "PASS");
 254                                         Srv->AddResolver(r);
 255                                 }
 256                                 catch (ModuleException& e)
 257                                 {
 258                                         if (NotifyOpers)
 259                                                 WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 260                                 }
 261                         }
 262
 263                         *user->password = 0;
 264
 265                         /*if(NotifyOpers)
 266                                 WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 267
 268                         return true;
 269                 }
 270                 else
 271                 {
 272                         log(DEBUG, "m_cgiirc.so: User's password was not a valid host");
 273                 }
 274
 275                 return false;
 276         }
 277
 278         bool CheckIdent(userrec* user)
 279         {
 280                 int ip[4];
 281                 char* ident;
 282                 char newip[16];
 283                 int len = strlen(user->ident);
 284
 285                 if(len == 8)
 286                         ident = user->ident;
 287                 else if(len == 9 && *user->ident == '~')
 288                         ident = user->ident+1;
 289                 else
 290                         return false;
 291
 292                 for(int i = 0; i < 4; i++)
 293                         if(!HexToInt(ip[i], ident + i*2))
 294                                 return false;
 295
 296                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 297
 298                 user->Extend("cgiirc_realhost", new std::string(user->host));
 299                 user->Extend("cgiirc_realip", new std::string(inet_ntoa(user->ip4)));
 300                 inet_aton(newip, &user->ip4);
 301
 302                 try
 303                 {
 304                         CGIResolver* r = new CGIResolver(NotifyOpers, newip, false, user, user->fd, "IDENT");
 305                         Srv->AddResolver(r);
 306                 }
 307                 catch (ModuleException& e)
 308                 {
 309                         strlcpy(user->host, newip, 16);
 310                         strlcpy(user->dhost, newip, 16);
 311                         strlcpy(user->ident, "~cgiirc", 8);
 312
 313                         if(NotifyOpers)
 314                                  WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 315                 }
 316                 /*strlcpy(user->host, newip, 16);
 317                 strlcpy(user->dhost, newip, 16);
 318                 strlcpy(user->ident, "~cgiirc", 8);*/
 319
 320                 /*if(NotifyOpers)
 321                         WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from ident", user->nick, user->host, newip);*/
 322
 323                 return true;
 324         }
 325
 326         bool IsValidHost(const std::string &host)
 327         {
 328                 if(!host.size())
 329                         return false;
 330
 331                 for(unsigned int i = 0; i < host.size(); i++)
 332                 {
 333                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 334                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 335                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 336                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 337                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 338
 339                                 continue;
 340                         else
 341                                 return false;
 342                 }
 343
 344                 return true;
 345         }
 346
 347         bool IsValidIP(const std::string &ip)
 348         {
 349                 if(ip.size() < 7 || ip.size() > 15)
 350                         return false;
 351
 352                 short sincedot = 0;
 353                 short dots = 0;
 354
 355                 for(unsigned int i = 0; i < ip.size(); i++)
 356                 {
 357                         if((dots <= 3) && (sincedot <= 3))
 358                         {
 359                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 360                                 {
 361                                         sincedot++;
 362                                 }
 363                                 else if(ip[i] == '.')
 364                                 {
 365                                         sincedot = 0;
 366                                         dots++;
 367                                 }
 368                         }
 369                         else
 370                         {
 371                                 return false;
 372
 373                         }
 374                 }
 375
 376                 if(dots != 3)
 377                         return false;
 378
 379                 return true;
 380         }
 381
 382         bool HexToInt(int &out, const char* in)
 383         {
 384                 char ip[3];
 385                 ip[0] = in[0];
 386                 ip[1] = in[1];
 387                 ip[2] = 0;
 388                 out = strtol(ip, NULL, 16);
 389
 390                 if(out > 255 || out < 0)
 391                         return false;
 392
 393                 return true;
 394         }
 395
 396         virtual ~ModuleCgiIRC()
 397         {
 398         }
 399
 400         virtual Version GetVersion()
 401         {
 402                 return Version(1,0,0,0,VF_VENDOR);
 403         }
 404
 405 };
 406
 407 class ModuleCgiIRCFactory : public ModuleFactory
 408 {
 409  public:
 410         ModuleCgiIRCFactory()
 411         {
 412         }
 413
 414         ~ModuleCgiIRCFactory()
 415         {
 416         }
 417
 418         virtual Module * CreateModule(Server* Me)
 419         {
 420                 return new ModuleCgiIRC(Me);
 421         }
 422
 423 };
 424
 425
 426 extern "C" void * init_module( void )
 427 {
 428         return new ModuleCgiIRCFactory;
 429 }