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 "dns.h"
  27 #include "inspircd.h"
  28
  29 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  30
  31 enum CGItype { PASS, IDENT, PASSFIRST, IDENTFIRST };
  32
  33 /** Holds a CGI site's details
  34  */
  35 class CGIhost : public classbase
  36 {
  37 public:
  38         std::string hostmask;
  39         CGItype type;
  40
  41         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST)
  42         : hostmask(mask), type(t)
  43         {
  44         }
  45 };
  46
  47 typedef std::vector<CGIhost> CGIHostlist;
  48
  49 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
  50  */
  51 class CGIResolver : public Resolver
  52 {
  53         std::string typ;
  54         int theirfd;
  55         userrec* them;
  56         bool notify;
  57  public:
  58         CGIResolver(Module* me, InspIRCd* ServerInstance, bool NotifyOpers, const std::string &source, bool forward, userrec* u, int userfd, const std::string &type)
  59                 : Resolver(ServerInstance, source, forward ? DNS_QUERY_FORWARD : DNS_QUERY_REVERSE, me), 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 == ServerInstance->SE->GetRef(theirfd)))
  65                 {
  66                         if (notify)
  67                                 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());
  68
  69                         strlcpy(them->host, result.c_str(), 63);
  70                         strlcpy(them->dhost, result.c_str(), 63);
  71                         strlcpy(them->ident, "~cgiirc", 8);
  72                 }
  73         }
  74
  75         virtual void OnError(ResolverError e, const std::string &errormessage)
  76         {
  77                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
  78                 {
  79                         if (notify)
  80                                 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());
  81                 }
  82         }
  83
  84         virtual ~CGIResolver()
  85         {
  86         }
  87 };
  88
  89 class ModuleCgiIRC : public Module
  90 {
  91
  92         bool NotifyOpers;
  93         CGIHostlist Hosts;
  94 public:
  95         ModuleCgiIRC(InspIRCd* Me) : Module::Module(Me)
  96         {
  97
  98                 OnRehash("");
  99         }
 100
 101         void Implements(char* List)
 102         {
 103                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = 1;
 104         }
 105
 106         virtual Priority Prioritize()
 107         {
 108                 // We want to get here before m_cloaking and m_hostchange etc
 109                 return PRIORITY_FIRST;
 110         }
 111
 112         virtual void OnRehash(const std::string &parameter)
 113         {
 114                 ConfigReader Conf(ServerInstance);
 115
 116                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 117
 118                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 119                         NotifyOpers = true;
 120
 121                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 122                 {
 123                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 124                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 125
 126                         if(hostmask.length())
 127                         {
 128                                 Hosts.push_back(CGIhost(hostmask));
 129
 130                                 if(type == "pass")
 131                                         Hosts.back().type = PASS;
 132                                 else if(type == "ident")
 133                                         Hosts.back().type = IDENT;
 134                                 else if(type == "passfirst")
 135                                         Hosts.back().type = PASSFIRST;
 136                         }
 137                         else
 138                         {
 139                                 ServerInstance->Log(DEBUG, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 140                                 continue;
 141                         }
 142                 }
 143         }
 144
 145         virtual void OnCleanup(int target_type, void* item)
 146         {
 147                 if(target_type == TYPE_USER)
 148                 {
 149                         userrec* user = (userrec*)item;
 150                         std::string* realhost;
 151                         std::string* realip;
 152
 153                         if(user->GetExt("cgiirc_realhost", realhost))
 154                         {
 155                                 delete realhost;
 156                                 user->Shrink("cgiirc_realhost");
 157                         }
 158
 159                         if(user->GetExt("cgiirc_realip", realip))
 160                         {
 161                                 delete realip;
 162                                 user->Shrink("cgiirc_realip");
 163                         }
 164                 }
 165         }
 166
 167         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 168         {
 169                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 170                 {
 171                         std::string* data;
 172
 173                         if(user->GetExt(extname, data))
 174                         {
 175                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 176                         }
 177                 }
 178         }
 179
 180         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 181         {
 182                 if(target_type == TYPE_USER)
 183                 {
 184                         userrec* dest = (userrec*)target;
 185                         std::string* bleh;
 186                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 187                         {
 188                                 dest->Extend(extname, new std::string(extdata));
 189                         }
 190                 }
 191         }
 192
 193         virtual void OnUserQuit(userrec* user, const std::string &message)
 194         {
 195                 OnCleanup(TYPE_USER, user);
 196         }
 197
 198
 199         virtual int OnUserRegister(userrec* user)
 200         {
 201                 ServerInstance->Log(DEBUG, "m_cgiirc.so: User %s registering, %s %s", user->nick,user->host,user->GetIPString());
 202
 203                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 204                 {
 205                         ServerInstance->Log(DEBUG, "m_cgiirc.so: Matching %s against (%s or %s)", iter->hostmask.c_str(), user->host, user->GetIPString());
 206
 207                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 208                         {
 209                                 // Deal with it...
 210                                 ServerInstance->Log(DEBUG, "m_cgiirc.so: Handling CGI:IRC user: %s (%s) matched %s", user->GetFullRealHost(), user->GetIPString(), iter->hostmask.c_str());
 211
 212                                 if(iter->type == PASS)
 213                                 {
 214                                         CheckPass(user); // We do nothing if it fails so...
 215                                 }
 216                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 217                                 {
 218                                         // If the password lookup failed, try the ident
 219                                         CheckIdent(user);       // If this fails too, do nothing
 220                                 }
 221                                 else if(iter->type == IDENT)
 222                                 {
 223                                         CheckIdent(user); // Nothing on failure.
 224                                 }
 225                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 226                                 {
 227                                         // If the ident lookup fails, try the password.
 228                                         CheckPass(user);
 229                                 }
 230                                 return 0;
 231                         }
 232                 }
 233                 return 0;
 234         }
 235
 236         bool CheckPass(userrec* user)
 237         {
 238                 ServerInstance->Log(DEBUG, "m_cgiirc.so: CheckPass(%s) - %s", user->nick, user->password);
 239
 240                 if(IsValidHost(user->password))
 241                 {
 242                         user->Extend("cgiirc_realhost", new std::string(user->host));
 243                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 244                         strlcpy(user->host, user->password, 64);
 245                         strlcpy(user->dhost, user->password, 64);
 246
 247 #ifdef IPV6
 248                         if (insp_aton(user->password, (insp_inaddr*)&((sockaddr_in6*)&user->ip)->sin6_addr))
 249 #else
 250                         if (insp_aton(user->password, (insp_inaddr*)&((sockaddr_in*)&user->ip)->sin_addr))
 251 #endif
 252                         {
 253                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 254                                 ServerInstance->Log(DEBUG, "m_cgiirc.so: Got an IP in the user's password");
 255
 256                                 if(NotifyOpers)
 257                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 258                         }
 259                         else
 260                         {
 261                                 /* We got as resolved hostname in the password. */
 262                                 ServerInstance->Log(DEBUG, "m_cgiirc.so: Got a hostname in the user's password");
 263
 264                                 try
 265                                 {
 266                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS");
 267                                         ServerInstance->AddResolver(r);
 268                                 }
 269                                 catch (ModuleException& e)
 270                                 {
 271                                         if (NotifyOpers)
 272                                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 273                                 }
 274                         }
 275
 276                         *user->password = 0;
 277
 278                         /*if(NotifyOpers)
 279                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 280
 281                         return true;
 282                 }
 283                 else
 284                 {
 285                         ServerInstance->Log(DEBUG, "m_cgiirc.so: User's password was not a valid host");
 286                 }
 287
 288                 return false;
 289         }
 290
 291         bool CheckIdent(userrec* user)
 292         {
 293                 int ip[4];
 294                 char* ident;
 295                 char newip[16];
 296                 int len = strlen(user->ident);
 297
 298                 if(len == 8)
 299                         ident = user->ident;
 300                 else if(len == 9 && *user->ident == '~')
 301                         ident = user->ident+1;
 302                 else
 303                         return false;
 304
 305                 for(int i = 0; i < 4; i++)
 306                         if(!HexToInt(ip[i], ident + i*2))
 307                                 return false;
 308
 309                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 310
 311                 user->Extend("cgiirc_realhost", new std::string(user->host));
 312                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 313 #ifdef IPV6
 314                 insp_aton(newip, (insp_inaddr*)&((sockaddr_in6*)&user->ip)->sin6_addr);
 315 #else
 316                 insp_aton(newip, (insp_inaddr*)&((sockaddr_in*)&user->ip)->sin_addr);
 317 #endif
 318
 319                 try
 320                 {
 321                         ServerInstance->Log(DEBUG,"MAKE RESOLVER: %s %d %s",newip, user->GetFd(), "IDENT");
 322                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT");
 323                         ServerInstance->AddResolver(r);
 324                 }
 325                 catch (ModuleException& e)
 326                 {
 327                         strlcpy(user->host, newip, 16);
 328                         strlcpy(user->dhost, newip, 16);
 329                         strlcpy(user->ident, "~cgiirc", 8);
 330
 331                         if(NotifyOpers)
 332                                  ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 333                 }
 334                 /*strlcpy(user->host, newip, 16);
 335                 strlcpy(user->dhost, newip, 16);
 336                 strlcpy(user->ident, "~cgiirc", 8);*/
 337
 338                 return true;
 339         }
 340
 341         bool IsValidHost(const std::string &host)
 342         {
 343                 if(!host.size())
 344                         return false;
 345
 346                 for(unsigned int i = 0; i < host.size(); i++)
 347                 {
 348                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 349                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 350                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 351                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 352                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 353
 354                                 continue;
 355                         else
 356                                 return false;
 357                 }
 358
 359                 return true;
 360         }
 361
 362         bool IsValidIP(const std::string &ip)
 363         {
 364                 if(ip.size() < 7 || ip.size() > 15)
 365                         return false;
 366
 367                 short sincedot = 0;
 368                 short dots = 0;
 369
 370                 for(unsigned int i = 0; i < ip.size(); i++)
 371                 {
 372                         if((dots <= 3) && (sincedot <= 3))
 373                         {
 374                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 375                                 {
 376                                         sincedot++;
 377                                 }
 378                                 else if(ip[i] == '.')
 379                                 {
 380                                         sincedot = 0;
 381                                         dots++;
 382                                 }
 383                         }
 384                         else
 385                         {
 386                                 return false;
 387
 388                         }
 389                 }
 390
 391                 if(dots != 3)
 392                         return false;
 393
 394                 return true;
 395         }
 396
 397         bool HexToInt(int &out, const char* in)
 398         {
 399                 char ip[3];
 400                 ip[0] = in[0];
 401                 ip[1] = in[1];
 402                 ip[2] = 0;
 403                 out = strtol(ip, NULL, 16);
 404
 405                 if(out > 255 || out < 0)
 406                         return false;
 407
 408                 return true;
 409         }
 410
 411         virtual ~ModuleCgiIRC()
 412         {
 413         }
 414
 415         virtual Version GetVersion()
 416         {
 417                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 418         }
 419
 420 };
 421
 422 class ModuleCgiIRCFactory : public ModuleFactory
 423 {
 424  public:
 425         ModuleCgiIRCFactory()
 426         {
 427         }
 428
 429         ~ModuleCgiIRCFactory()
 430         {
 431         }
 432
 433         virtual Module * CreateModule(InspIRCd* Me)
 434         {
 435                 return new ModuleCgiIRC(Me);
 436         }
 437
 438 };
 439
 440
 441 extern "C" void * init_module( void )
 442 {
 443         return new ModuleCgiIRCFactory;
 444 }