src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include <vector>
  15 #include <string>
  16 #include <stdlib.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include "users.h"
  21 #include "modules.h"
  22 #include "dns.h"
  23 #include "inspircd.h"
  24
  25 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  26
  27 enum CGItype { PASS, IDENT, PASSFIRST, IDENTFIRST };
  28
  29 /** Holds a CGI site's details
  30  */
  31 class CGIhost : public classbase
  32 {
  33 public:
  34         std::string hostmask;
  35         CGItype type;
  36
  37         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST)
  38         : hostmask(mask), type(t)
  39         {
  40         }
  41 };
  42
  43 typedef std::vector<CGIhost> CGIHostlist;
  44
  45 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
  46  */
  47 class CGIResolver : public Resolver
  48 {
  49         std::string typ;
  50         int theirfd;
  51         userrec* them;
  52         bool notify;
  53  public:
  54         CGIResolver(Module* me, InspIRCd* ServerInstance, bool NotifyOpers, const std::string &source, bool forward, userrec* u, int userfd, const std::string &type, bool &cached)
  55                 : Resolver(ServerInstance, source, forward ? DNS_QUERY_FORWARD : DNS_QUERY_REVERSE, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
  56
  57         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  58         {
  59                 /* Check the user still exists */
  60                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
  61                 {
  62                         if (notify)
  63                                 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());
  64
  65                         strlcpy(them->host, result.c_str(), 63);
  66                         strlcpy(them->dhost, result.c_str(), 63);
  67                         strlcpy(them->ident, "~cgiirc", 8);
  68                 }
  69         }
  70
  71         virtual void OnError(ResolverError e, const std::string &errormessage)
  72         {
  73                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
  74                 {
  75                         if (notify)
  76                                 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());
  77                 }
  78         }
  79
  80         virtual ~CGIResolver()
  81         {
  82         }
  83 };
  84
  85 class ModuleCgiIRC : public Module
  86 {
  87
  88         bool NotifyOpers;
  89         CGIHostlist Hosts;
  90 public:
  91         ModuleCgiIRC(InspIRCd* Me) : Module::Module(Me)
  92         {
  93
  94                 OnRehash(NULL,"");
  95         }
  96
  97         void Implements(char* List)
  98         {
  99                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = 1;
 100         }
 101
 102         virtual Priority Prioritize()
 103         {
 104                 // We want to get here before m_cloaking and m_hostchange etc
 105                 return PRIORITY_FIRST;
 106         }
 107
 108         virtual void OnRehash(userrec* user, const std::string &parameter)
 109         {
 110                 ConfigReader Conf(ServerInstance);
 111
 112                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 113
 114                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 115                         NotifyOpers = true;
 116
 117                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 118                 {
 119                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 120                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 121
 122                         if(hostmask.length())
 123                         {
 124                                 Hosts.push_back(CGIhost(hostmask));
 125
 126                                 if(type == "pass")
 127                                         Hosts.back().type = PASS;
 128                                 else if(type == "ident")
 129                                         Hosts.back().type = IDENT;
 130                                 else if(type == "passfirst")
 131                                         Hosts.back().type = PASSFIRST;
 132                         }
 133                         else
 134                         {
 135                                 ServerInstance->Log(DEBUG, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 136                                 continue;
 137                         }
 138                 }
 139         }
 140
 141         virtual void OnCleanup(int target_type, void* item)
 142         {
 143                 if(target_type == TYPE_USER)
 144                 {
 145                         userrec* user = (userrec*)item;
 146                         std::string* realhost;
 147                         std::string* realip;
 148
 149                         if(user->GetExt("cgiirc_realhost", realhost))
 150                         {
 151                                 delete realhost;
 152                                 user->Shrink("cgiirc_realhost");
 153                         }
 154
 155                         if(user->GetExt("cgiirc_realip", realip))
 156                         {
 157                                 delete realip;
 158                                 user->Shrink("cgiirc_realip");
 159                         }
 160                 }
 161         }
 162
 163         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 164         {
 165                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 166                 {
 167                         std::string* data;
 168
 169                         if(user->GetExt(extname, data))
 170                         {
 171                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 172                         }
 173                 }
 174         }
 175
 176         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 177         {
 178                 if(target_type == TYPE_USER)
 179                 {
 180                         userrec* dest = (userrec*)target;
 181                         std::string* bleh;
 182                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 183                         {
 184                                 dest->Extend(extname, new std::string(extdata));
 185                         }
 186                 }
 187         }
 188
 189         virtual void OnUserQuit(userrec* user, const std::string &message)
 190         {
 191                 OnCleanup(TYPE_USER, user);
 192         }
 193
 194
 195         virtual int OnUserRegister(userrec* user)
 196         {
 197                 ServerInstance->Log(DEBUG, "m_cgiirc.so: User %s registering, %s %s", user->nick,user->host,user->GetIPString());
 198
 199                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 200                 {
 201                         ServerInstance->Log(DEBUG, "m_cgiirc.so: Matching %s against (%s or %s)", iter->hostmask.c_str(), user->host, user->GetIPString());
 202
 203                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 204                         {
 205                                 // Deal with it...
 206                                 ServerInstance->Log(DEBUG, "m_cgiirc.so: Handling CGI:IRC user: %s (%s) matched %s", user->GetFullRealHost(), user->GetIPString(), iter->hostmask.c_str());
 207
 208                                 if(iter->type == PASS)
 209                                 {
 210                                         CheckPass(user); // We do nothing if it fails so...
 211                                 }
 212                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 213                                 {
 214                                         // If the password lookup failed, try the ident
 215                                         CheckIdent(user);       // If this fails too, do nothing
 216                                 }
 217                                 else if(iter->type == IDENT)
 218                                 {
 219                                         CheckIdent(user); // Nothing on failure.
 220                                 }
 221                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 222                                 {
 223                                         // If the ident lookup fails, try the password.
 224                                         CheckPass(user);
 225                                 }
 226                                 return 0;
 227                         }
 228                 }
 229                 return 0;
 230         }
 231
 232         bool CheckPass(userrec* user)
 233         {
 234                 ServerInstance->Log(DEBUG, "m_cgiirc.so: CheckPass(%s) - %s", user->nick, user->password);
 235
 236                 if(IsValidHost(user->password))
 237                 {
 238                         user->Extend("cgiirc_realhost", new std::string(user->host));
 239                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 240                         strlcpy(user->host, user->password, 64);
 241                         strlcpy(user->dhost, user->password, 64);
 242
 243 #ifdef IPV6
 244                         if (insp_aton(user->password, (insp_inaddr*)&((sockaddr_in6*)&user->ip)->sin6_addr))
 245 #else
 246                         if (insp_aton(user->password, (insp_inaddr*)&((sockaddr_in*)&user->ip)->sin_addr))
 247 #endif
 248                         {
 249                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 250                                 ServerInstance->Log(DEBUG, "m_cgiirc.so: Got an IP in the user's password");
 251
 252                                 if(NotifyOpers)
 253                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 254                         }
 255                         else
 256                         {
 257                                 /* We got as resolved hostname in the password. */
 258                                 ServerInstance->Log(DEBUG, "m_cgiirc.so: Got a hostname in the user's password");
 259
 260                                 try
 261                                 {
 262                                         bool cached;
 263                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 264                                         ServerInstance->AddResolver(r, cached);
 265                                 }
 266                                 catch (ModuleException& e)
 267                                 {
 268                                         if (NotifyOpers)
 269                                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 270                                 }
 271                         }
 272
 273                         *user->password = 0;
 274
 275                         /*if(NotifyOpers)
 276                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 277
 278                         return true;
 279                 }
 280                 else
 281                 {
 282                         ServerInstance->Log(DEBUG, "m_cgiirc.so: User's password was not a valid host");
 283                 }
 284
 285                 return false;
 286         }
 287
 288         bool CheckIdent(userrec* user)
 289         {
 290                 int ip[4];
 291                 char* ident;
 292                 char newip[16];
 293                 int len = strlen(user->ident);
 294
 295                 if(len == 8)
 296                         ident = user->ident;
 297                 else if(len == 9 && *user->ident == '~')
 298                         ident = user->ident+1;
 299                 else
 300                         return false;
 301
 302                 for(int i = 0; i < 4; i++)
 303                         if(!HexToInt(ip[i], ident + i*2))
 304                                 return false;
 305
 306                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 307
 308                 user->Extend("cgiirc_realhost", new std::string(user->host));
 309                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 310 #ifdef IPV6
 311                 insp_aton(newip, (insp_inaddr*)&((sockaddr_in6*)&user->ip)->sin6_addr);
 312 #else
 313                 insp_aton(newip, (insp_inaddr*)&((sockaddr_in*)&user->ip)->sin_addr);
 314 #endif
 315
 316                 try
 317                 {
 318                         ServerInstance->Log(DEBUG,"MAKE RESOLVER: %s %d %s",newip, user->GetFd(), "IDENT");
 319                         bool cached;
 320                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 321                         ServerInstance->AddResolver(r, cached);
 322                 }
 323                 catch (ModuleException& e)
 324                 {
 325                         strlcpy(user->host, newip, 16);
 326                         strlcpy(user->dhost, newip, 16);
 327                         strlcpy(user->ident, "~cgiirc", 8);
 328
 329                         if(NotifyOpers)
 330                                  ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 331                 }
 332                 /*strlcpy(user->host, newip, 16);
 333                 strlcpy(user->dhost, newip, 16);
 334                 strlcpy(user->ident, "~cgiirc", 8);*/
 335
 336                 return true;
 337         }
 338
 339         bool IsValidHost(const std::string &host)
 340         {
 341                 if(!host.size())
 342                         return false;
 343
 344                 for(unsigned int i = 0; i < host.size(); i++)
 345                 {
 346                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 347                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 348                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 349                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 350                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 351
 352                                 continue;
 353                         else
 354                                 return false;
 355                 }
 356
 357                 return true;
 358         }
 359
 360         bool IsValidIP(const std::string &ip)
 361         {
 362                 if(ip.size() < 7 || ip.size() > 15)
 363                         return false;
 364
 365                 short sincedot = 0;
 366                 short dots = 0;
 367
 368                 for(unsigned int i = 0; i < ip.size(); i++)
 369                 {
 370                         if((dots <= 3) && (sincedot <= 3))
 371                         {
 372                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 373                                 {
 374                                         sincedot++;
 375                                 }
 376                                 else if(ip[i] == '.')
 377                                 {
 378                                         sincedot = 0;
 379                                         dots++;
 380                                 }
 381                         }
 382                         else
 383                         {
 384                                 return false;
 385
 386                         }
 387                 }
 388
 389                 if(dots != 3)
 390                         return false;
 391
 392                 return true;
 393         }
 394
 395         bool HexToInt(int &out, const char* in)
 396         {
 397                 char ip[3];
 398                 ip[0] = in[0];
 399                 ip[1] = in[1];
 400                 ip[2] = 0;
 401                 out = strtol(ip, NULL, 16);
 402
 403                 if(out > 255 || out < 0)
 404                         return false;
 405
 406                 return true;
 407         }
 408
 409         virtual ~ModuleCgiIRC()
 410         {
 411         }
 412
 413         virtual Version GetVersion()
 414         {
 415                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 416         }
 417
 418 };
 419
 420 class ModuleCgiIRCFactory : public ModuleFactory
 421 {
 422  public:
 423         ModuleCgiIRCFactory()
 424         {
 425         }
 426
 427         ~ModuleCgiIRCFactory()
 428         {
 429         }
 430
 431         virtual Module * CreateModule(InspIRCd* Me)
 432         {
 433                 return new ModuleCgiIRC(Me);
 434         }
 435
 436 };
 437
 438
 439 extern "C" void * init_module( void )
 440 {
 441         return new ModuleCgiIRCFactory;
 442 }