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
  33 /* We need this for checking our user hasnt /quit before we finish our lookup */
  34 extern userrec* fd_ref_table[MAX_DESCRIPTORS];
  35
  36 enum CGItype { PASS, IDENT, PASSFIRST, IDENTFIRST };
  37
  38 class CGIhost : public classbase
  39 {
  40 public:
  41         std::string hostmask;
  42         CGItype type;
  43
  44         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST)
  45         : hostmask(mask), type(t)
  46         {
  47         }
  48 };
  49
  50 typedef std::vector<CGIhost> CGIHostlist;
  51
  52 class CGIResolver : public Resolver
  53 {
  54         std::string typ;
  55         int theirfd;
  56         userrec* them;
  57         bool notify;
  58  public:
  59         CGIResolver(bool NotifyOpers, const std::string &source, bool forward, userrec* u, int userfd, const std::string &type)
  60                 : Resolver(source, forward ? DNS_QUERY_FORWARD : DNS_QUERY_REVERSE), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
  61
  62         virtual void OnLookupComplete(const std::string &result)
  63         {
  64                 /* Check the user still exists */
  65                 if ((them) && (them == fd_ref_table[theirfd]))
  66                 {
  67                         if (notify)
  68                                 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());
  69
  70                         strlcpy(them->host, result.c_str(), 63);
  71                         strlcpy(them->dhost, result.c_str(), 63);
  72                         strlcpy(them->ident, "~cgiirc", 8);
  73                 }
  74         }
  75
  76         virtual void OnError(ResolverError e, const std::string &errormessage)
  77         {
  78                 if ((them) && (them == fd_ref_table[theirfd]))
  79                 {
  80                         if (notify)
  81                                 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());
  82                 }
  83         }
  84
  85         virtual ~CGIResolver()
  86         {
  87         }
  88 };
  89
  90 class ModuleCgiIRC : public Module
  91 {
  92         Server *Srv;
  93         bool NotifyOpers;
  94         CGIHostlist Hosts;
  95 public:
  96         ModuleCgiIRC(Server* Me) : Module::Module(Me)
  97         {
  98                 Srv = Me;
  99                 OnRehash("");
 100         }
 101
 102         void Implements(char* List)
 103         {
 104                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = 1;
 105         }
 106
 107         virtual Priority Prioritize()
 108         {
 109                 // We want to get here before m_cloaking and m_hostchange etc
 110                 return PRIORITY_FIRST;
 111         }
 112
 113         virtual void OnRehash(const std::string &parameter)
 114         {
 115                 ConfigReader Conf;
 116
 117                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 118
 119                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 120                         NotifyOpers = true;
 121
 122                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 123                 {
 124                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 125                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 126
 127                         if(hostmask.length())
 128                         {
 129                                 Hosts.push_back(CGIhost(hostmask));
 130
 131                                 if(type == "pass")
 132                                         Hosts.back().type = PASS;
 133                                 else if(type == "ident")
 134                                         Hosts.back().type = IDENT;
 135                                 else if(type == "passfirst")
 136                                         Hosts.back().type = PASSFIRST;
 137                         }
 138                         else
 139                         {
 140                                 log(DEBUG, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 141                                 continue;
 142                         }
 143                 }
 144         }
 145
 146         virtual void OnCleanup(int target_type, void* item)
 147         {
 148                 if(target_type == TYPE_USER)
 149                 {
 150                         userrec* user = (userrec*)item;
 151                         std::string* realhost;
 152                         std::string* realip;
 153
 154                         if(user->GetExt("cgiirc_realhost", realhost))
 155                         {
 156                                 delete realhost;
 157                                 user->Shrink("cgiirc_realhost");
 158                         }
 159
 160                         if(user->GetExt("cgiirc_realip", realip))
 161                         {
 162                                 delete realip;
 163                                 user->Shrink("cgiirc_realip");
 164                         }
 165                 }
 166         }
 167
 168         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 169         {
 170                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 171                 {
 172                         std::string* data;
 173
 174                         if(user->GetExt(extname, data))
 175                         {
 176                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 177                         }
 178                 }
 179         }
 180
 181         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 182         {
 183                 if(target_type == TYPE_USER)
 184                 {
 185                         userrec* dest = (userrec*)target;
 186                         std::string* bleh;
 187                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 188                         {
 189                                 dest->Extend(extname, new std::string(extdata));
 190                         }
 191                 }
 192         }
 193
 194         virtual void OnUserQuit(userrec* user, const std::string &message)
 195         {
 196                 OnCleanup(TYPE_USER, user);
 197         }
 198
 199
 200         virtual void OnUserRegister(userrec* user)
 201         {
 202                 log(DEBUG, "m_cgiirc.so: User %s registering, %s %s", user->nick,user->host,user->GetIPString());
 203
 204                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 205                 {
 206                         log(DEBUG, "m_cgiirc.so: Matching %s against (%s or %s)", iter->hostmask.c_str(), user->host, user->GetIPString());
 207
 208                         if(Srv->MatchText(user->host, iter->hostmask) || Srv->MatchText(user->GetIPString(), iter->hostmask))
 209                         {
 210                                 // Deal with it...
 211                                 log(DEBUG, "m_cgiirc.so: Handling CGI:IRC user: %s (%s) matched %s", user->GetFullRealHost(), user->GetIPString(), iter->hostmask.c_str());
 212
 213                                 if(iter->type == PASS)
 214                                 {
 215                                         CheckPass(user); // We do nothing if it fails so...
 216                                 }
 217                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 218                                 {
 219                                         // If the password lookup failed, try the ident
 220                                         CheckIdent(user);       // If this fails too, do nothing
 221                                 }
 222                                 else if(iter->type == IDENT)
 223                                 {
 224                                         CheckIdent(user); // Nothing on failure.
 225                                 }
 226                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 227                                 {
 228                                         // If the ident lookup fails, try the password.
 229                                         CheckPass(user);
 230                                 }
 231
 232                                 return;
 233                         }
 234                 }
 235         }
 236
 237         bool CheckPass(userrec* user)
 238         {
 239                 log(DEBUG, "m_cgiirc.so: CheckPass(%s) - %s", user->nick, user->password);
 240
 241                 if(IsValidHost(user->password))
 242                 {
 243                         user->Extend("cgiirc_realhost", new std::string(user->host));
 244                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 245                         strlcpy(user->host, user->password, 64);
 246                         strlcpy(user->dhost, user->password, 64);
 247
 248 #ifdef IPV6
 249                         if (insp_aton(user->password, (insp_inaddr*)&((sockaddr_in6*)&user->ip)->sin6_addr))
 250 #else
 251                         if (insp_aton(user->password, (insp_inaddr*)&((sockaddr_in*)&user->ip)->sin_addr))
 252 #endif
 253                         {
 254                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 255                                 log(DEBUG, "m_cgiirc.so: Got an IP in the user's password");
 256
 257                                 if(NotifyOpers)
 258                                         WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 259                         }
 260                         else
 261                         {
 262                                 /* We got as resolved hostname in the password. */
 263                                 log(DEBUG, "m_cgiirc.so: Got a hostname in the user's password");
 264
 265                                 try
 266                                 {
 267                                         CGIResolver* r = new CGIResolver(NotifyOpers, user->password, false, user, user->fd, "PASS");
 268                                         Srv->AddResolver(r);
 269                                 }
 270                                 catch (ModuleException& e)
 271                                 {
 272                                         if (NotifyOpers)
 273                                                 WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 274                                 }
 275                         }
 276
 277                         *user->password = 0;
 278
 279                         /*if(NotifyOpers)
 280                                 WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 281
 282                         return true;
 283                 }
 284                 else
 285                 {
 286                         log(DEBUG, "m_cgiirc.so: User's password was not a valid host");
 287                 }
 288
 289                 return false;
 290         }
 291
 292         bool CheckIdent(userrec* user)
 293         {
 294                 int ip[4];
 295                 char* ident;
 296                 char newip[16];
 297                 int len = strlen(user->ident);
 298
 299                 if(len == 8)
 300                         ident = user->ident;
 301                 else if(len == 9 && *user->ident == '~')
 302                         ident = user->ident+1;
 303                 else
 304                         return false;
 305
 306                 for(int i = 0; i < 4; i++)
 307                         if(!HexToInt(ip[i], ident + i*2))
 308                                 return false;
 309
 310                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 311
 312                 user->Extend("cgiirc_realhost", new std::string(user->host));
 313                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 314 #ifdef IPV6
 315                 insp_aton(newip, (insp_inaddr*)&((sockaddr_in6*)&user->ip)->sin6_addr);
 316 #else
 317                 insp_aton(newip, (insp_inaddr*)&((sockaddr_in*)&user->ip)->sin_addr);
 318 #endif
 319
 320                 try
 321                 {
 322                         log(DEBUG,"MAKE RESOLVER: %s %d %s",newip, user->fd, "IDENT");
 323                         CGIResolver* r = new CGIResolver(NotifyOpers, newip, false, user, user->fd, "IDENT");
 324                         Srv->AddResolver(r);
 325                 }
 326                 catch (ModuleException& e)
 327                 {
 328                         strlcpy(user->host, newip, 16);
 329                         strlcpy(user->dhost, newip, 16);
 330                         strlcpy(user->ident, "~cgiirc", 8);
 331
 332                         if(NotifyOpers)
 333                                  WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 334                 }
 335                 /*strlcpy(user->host, newip, 16);
 336                 strlcpy(user->dhost, newip, 16);
 337                 strlcpy(user->ident, "~cgiirc", 8);*/
 338
 339                 return true;
 340         }
 341
 342         bool IsValidHost(const std::string &host)
 343         {
 344                 if(!host.size())
 345                         return false;
 346
 347                 for(unsigned int i = 0; i < host.size(); i++)
 348                 {
 349                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 350                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 351                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 352                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 353                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 354
 355                                 continue;
 356                         else
 357                                 return false;
 358                 }
 359
 360                 return true;
 361         }
 362
 363         bool IsValidIP(const std::string &ip)
 364         {
 365                 if(ip.size() < 7 || ip.size() > 15)
 366                         return false;
 367
 368                 short sincedot = 0;
 369                 short dots = 0;
 370
 371                 for(unsigned int i = 0; i < ip.size(); i++)
 372                 {
 373                         if((dots <= 3) && (sincedot <= 3))
 374                         {
 375                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 376                                 {
 377                                         sincedot++;
 378                                 }
 379                                 else if(ip[i] == '.')
 380                                 {
 381                                         sincedot = 0;
 382                                         dots++;
 383                                 }
 384                         }
 385                         else
 386                         {
 387                                 return false;
 388
 389                         }
 390                 }
 391
 392                 if(dots != 3)
 393                         return false;
 394
 395                 return true;
 396         }
 397
 398         bool HexToInt(int &out, const char* in)
 399         {
 400                 char ip[3];
 401                 ip[0] = in[0];
 402                 ip[1] = in[1];
 403                 ip[2] = 0;
 404                 out = strtol(ip, NULL, 16);
 405
 406                 if(out > 255 || out < 0)
 407                         return false;
 408
 409                 return true;
 410         }
 411
 412         virtual ~ModuleCgiIRC()
 413         {
 414         }
 415
 416         virtual Version GetVersion()
 417         {
 418                 return Version(1,0,0,0,VF_VENDOR);
 419         }
 420
 421 };
 422
 423 class ModuleCgiIRCFactory : public ModuleFactory
 424 {
 425  public:
 426         ModuleCgiIRCFactory()
 427         {
 428         }
 429
 430         ~ModuleCgiIRCFactory()
 431         {
 432         }
 433
 434         virtual Module * CreateModule(Server* Me)
 435         {
 436                 return new ModuleCgiIRC(Me);
 437         }
 438
 439 };
 440
 441
 442 extern "C" void * init_module( void )
 443 {
 444         return new ModuleCgiIRCFactory;
 445 }