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                         them->InvalidateCache();
  69                 }
  70         }
  71
  72         virtual void OnError(ResolverError e, const std::string &errormessage)
  73         {
  74                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
  75                 {
  76                         if (notify)
  77                                 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());
  78                 }
  79         }
  80
  81         virtual ~CGIResolver()
  82         {
  83         }
  84 };
  85
  86 class ModuleCgiIRC : public Module
  87 {
  88
  89         bool NotifyOpers;
  90         CGIHostlist Hosts;
  91 public:
  92         ModuleCgiIRC(InspIRCd* Me) : Module::Module(Me)
  93         {
  94
  95                 OnRehash(NULL,"");
  96         }
  97
  98         void Implements(char* List)
  99         {
 100                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = 1;
 101         }
 102
 103         virtual Priority Prioritize()
 104         {
 105                 // We want to get here before m_cloaking and m_hostchange etc
 106                 return PRIORITY_FIRST;
 107         }
 108
 109         virtual void OnRehash(userrec* user, const std::string &parameter)
 110         {
 111                 ConfigReader Conf(ServerInstance);
 112
 113                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 114
 115                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 116                         NotifyOpers = true;
 117
 118                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 119                 {
 120                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 121                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 122
 123                         if(hostmask.length())
 124                         {
 125                                 Hosts.push_back(CGIhost(hostmask));
 126
 127                                 if(type == "pass")
 128                                         Hosts.back().type = PASS;
 129                                 else if(type == "ident")
 130                                         Hosts.back().type = IDENT;
 131                                 else if(type == "passfirst")
 132                                         Hosts.back().type = PASSFIRST;
 133                         }
 134                         else
 135                         {
 136                                 ServerInstance->Log(DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 137                                 continue;
 138                         }
 139                 }
 140         }
 141
 142         virtual void OnCleanup(int target_type, void* item)
 143         {
 144                 if(target_type == TYPE_USER)
 145                 {
 146                         userrec* user = (userrec*)item;
 147                         std::string* realhost;
 148                         std::string* realip;
 149
 150                         if(user->GetExt("cgiirc_realhost", realhost))
 151                         {
 152                                 delete realhost;
 153                                 user->Shrink("cgiirc_realhost");
 154                         }
 155
 156                         if(user->GetExt("cgiirc_realip", realip))
 157                         {
 158                                 delete realip;
 159                                 user->Shrink("cgiirc_realip");
 160                         }
 161                 }
 162         }
 163
 164         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname)
 165         {
 166                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 167                 {
 168                         std::string* data;
 169
 170                         if(user->GetExt(extname, data))
 171                         {
 172                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 173                         }
 174                 }
 175         }
 176
 177         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 178         {
 179                 if(target_type == TYPE_USER)
 180                 {
 181                         userrec* dest = (userrec*)target;
 182                         std::string* bleh;
 183                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 184                         {
 185                                 dest->Extend(extname, new std::string(extdata));
 186                         }
 187                 }
 188         }
 189
 190         virtual void OnUserQuit(userrec* user, const std::string &message)
 191         {
 192                 OnCleanup(TYPE_USER, user);
 193         }
 194
 195
 196         virtual int OnUserRegister(userrec* user)
 197         {
 198                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 199                 {
 200                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 201                         {
 202                                 // Deal with it...
 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                                 return 0;
 222                         }
 223                 }
 224                 return 0;
 225         }
 226
 227         bool CheckPass(userrec* user)
 228         {
 229                 if(IsValidHost(user->password))
 230                 {
 231                         user->Extend("cgiirc_realhost", new std::string(user->host));
 232                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 233                         strlcpy(user->host, user->password, 64);
 234                         strlcpy(user->dhost, user->password, 64);
 235                         user->InvalidateCache();
 236
 237                         bool valid = false;
 238 #ifdef IPV6
 239                         if (user->GetAddressFamily() == AF_INET6)
 240                                 valid = (inet_pton(AF_INET6, user->password, &((sockaddr_in6*)&user->ip)->sin6_addr) > 0);
 241                         else
 242                                 valid = (inet_aton(user->password, &((sockaddr_in*)&user->ip)->sin_addr));
 243 #else
 244                         if (inet_aton(user->password, &((sockaddr_in*)&user->ip)->sin_addr))
 245                                 valid = true;
 246 #endif
 247                         if (valid)
 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                                 if(NotifyOpers)
 251                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 252                         }
 253                         else
 254                         {
 255                                 /* We got as resolved hostname in the password. */
 256                                 try
 257                                 {
 258                                         bool cached;
 259                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 260                                         ServerInstance->AddResolver(r, cached);
 261                                 }
 262                                 catch (ModuleException& e)
 263                                 {
 264                                         if (NotifyOpers)
 265                                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 266                                 }
 267                         }
 268
 269                         *user->password = 0;
 270
 271                         /*if(NotifyOpers)
 272                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 273
 274                         return true;
 275                 }
 276
 277                 return false;
 278         }
 279
 280         bool CheckIdent(userrec* user)
 281         {
 282                 int ip[4];
 283                 char* ident;
 284                 char newip[16];
 285                 int len = strlen(user->ident);
 286
 287                 if(len == 8)
 288                         ident = user->ident;
 289                 else if(len == 9 && *user->ident == '~')
 290                         ident = user->ident+1;
 291                 else
 292                         return false;
 293
 294                 for(int i = 0; i < 4; i++)
 295                         if(!HexToInt(ip[i], ident + i*2))
 296                                 return false;
 297
 298                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 299
 300                 user->Extend("cgiirc_realhost", new std::string(user->host));
 301                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 302 #ifdef IPV6
 303                 if (user->GetAddressFamily() == AF_INET6)
 304                         inet_pton(AF_INET6, newip, &((sockaddr_in6*)&user->ip)->sin6_addr);
 305                 else
 306                         inet_aton(newip, &((sockaddr_in*)&user->ip)->sin_addr);
 307 #else
 308                 inet_aton(newip, &((sockaddr_in*)&user->ip)->sin_addr);
 309 #endif
 310
 311
 312                 try
 313                 {
 314                         bool cached;
 315                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 316                         ServerInstance->AddResolver(r, cached);
 317                 }
 318                 catch (ModuleException& e)
 319                 {
 320                         strlcpy(user->host, newip, 16);
 321                         strlcpy(user->dhost, newip, 16);
 322                         strlcpy(user->ident, "~cgiirc", 8);
 323                         user->InvalidateCache();
 324
 325                         if(NotifyOpers)
 326                                  ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 327                 }
 328                 /*strlcpy(user->host, newip, 16);
 329                 strlcpy(user->dhost, newip, 16);
 330                 strlcpy(user->ident, "~cgiirc", 8);*/
 331
 332                 return true;
 333         }
 334
 335         bool IsValidHost(const std::string &host)
 336         {
 337                 if(!host.size())
 338                         return false;
 339
 340                 for(unsigned int i = 0; i < host.size(); i++)
 341                 {
 342                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 343                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 344                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 345                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 346                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 347
 348                                 continue;
 349                         else
 350                                 return false;
 351                 }
 352
 353                 return true;
 354         }
 355
 356         bool IsValidIP(const std::string &ip)
 357         {
 358                 if(ip.size() < 7 || ip.size() > 15)
 359                         return false;
 360
 361                 short sincedot = 0;
 362                 short dots = 0;
 363
 364                 for(unsigned int i = 0; i < ip.size(); i++)
 365                 {
 366                         if((dots <= 3) && (sincedot <= 3))
 367                         {
 368                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 369                                 {
 370                                         sincedot++;
 371                                 }
 372                                 else if(ip[i] == '.')
 373                                 {
 374                                         sincedot = 0;
 375                                         dots++;
 376                                 }
 377                         }
 378                         else
 379                         {
 380                                 return false;
 381
 382                         }
 383                 }
 384
 385                 if(dots != 3)
 386                         return false;
 387
 388                 return true;
 389         }
 390
 391         bool HexToInt(int &out, const char* in)
 392         {
 393                 char ip[3];
 394                 ip[0] = in[0];
 395                 ip[1] = in[1];
 396                 ip[2] = 0;
 397                 out = strtol(ip, NULL, 16);
 398
 399                 if(out > 255 || out < 0)
 400                         return false;
 401
 402                 return true;
 403         }
 404
 405         virtual ~ModuleCgiIRC()
 406         {
 407         }
 408
 409         virtual Version GetVersion()
 410         {
 411                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 412         }
 413
 414 };
 415
 416 class ModuleCgiIRCFactory : public ModuleFactory
 417 {
 418  public:
 419         ModuleCgiIRCFactory()
 420         {
 421         }
 422
 423         ~ModuleCgiIRCFactory()
 424         {
 425         }
 426
 427         virtual Module * CreateModule(InspIRCd* Me)
 428         {
 429                 return new ModuleCgiIRC(Me);
 430         }
 431
 432 };
 433
 434
 435 extern "C" void * init_module( void )
 436 {
 437         return new ModuleCgiIRCFactory;
 438 }