src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #ifndef WINDOWS
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #endif
  21
  22 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  23
  24 enum CGItype { INVALID, PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
  25
  26
  27 /** Holds a CGI site's details
  28  */
  29 class CGIhost : public classbase
  30 {
  31 public:
  32         std::string hostmask;
  33         CGItype type;
  34         std::string password;
  35
  36         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST, const std::string &spassword ="")
  37         : hostmask(mask), type(t), password(spassword)
  38         {
  39         }
  40 };
  41 typedef std::vector<CGIhost> CGIHostlist;
  42
  43 /*
  44  * WEBIRC
  45  *  This is used for the webirc method of CGIIRC auth, and is (really) the best way to do these things.
  46  *  Syntax: WEBIRC password client hostname ip
  47  *  Where password is a shared key, client is the name of the "client" and version (e.g. cgiirc), hostname
  48  *  is the resolved host of the client issuing the command and IP is the real IP of the client.
  49  *
  50  * How it works:
  51  *  To tie in with the rest of cgiirc module, and to avoid race conditions, /webirc is only processed locally
  52  *  and simply sets metadata on the user, which is later decoded on full connect to give something meaningful.
  53  */
  54 class CommandWebirc : public Command
  55 {
  56         CGIHostlist Hosts;
  57         bool notify;
  58         public:
  59                 CommandWebirc(InspIRCd* Instance, CGIHostlist &cHosts, bool bnotify) : Command(Instance, "WEBIRC", 0, 4, true), Hosts(cHosts), notify(bnotify)
  60                 {
  61                         this->source = "m_cgiirc.so";
  62                         this->syntax = "password client hostname ip";
  63                 }
  64                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  65                 {
  66                         if(user->registered == REG_ALL)
  67                                 return CMD_FAILURE;
  68
  69                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  70                         {
  71                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  72                                 {
  73                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  74                                         {
  75                                                 user->Extend("cgiirc_realhost", new std::string(user->host));
  76                                                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
  77                                                 if (notify)
  78                                                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick.c_str(), user->host.c_str(), parameters[2].c_str(), user->host.c_str());
  79                                                 user->Extend("cgiirc_webirc_hostname", new std::string(parameters[2]));
  80                                                 user->Extend("cgiirc_webirc_ip", new std::string(parameters[3]));
  81                                                 return CMD_LOCALONLY;
  82                                         }
  83                                 }
  84                         }
  85
  86                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
  87                         return CMD_FAILURE;
  88                 }
  89 };
  90
  91
  92 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
  93  */
  94 class CGIResolver : public Resolver
  95 {
  96         std::string typ;
  97         int theirfd;
  98         User* them;
  99         bool notify;
 100  public:
 101         CGIResolver(Module* me, InspIRCd* Instance, bool NotifyOpers, const std::string &source, bool forward, User* u, int userfd, const std::string &type, bool &cached)
 102                 : Resolver(Instance, source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
 103
 104         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 105         {
 106                 /* Check the user still exists */
 107                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 108                 {
 109                         if (notify)
 110                                 ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", them->nick.c_str(), them->host.c_str(), result.c_str(), typ.c_str());
 111
 112                         them->host.assign(result,0, 64);
 113                         them->dhost.assign(result, 0, 64);
 114                         if (querytype)
 115                                 them->SetSockAddr(them->GetProtocolFamily(), result.c_str(), them->GetPort());
 116                         them->ident.assign("~cgiirc", 0, 8);
 117                         them->InvalidateCache();
 118                         them->CheckLines(true);
 119                 }
 120         }
 121
 122         virtual void OnError(ResolverError e, const std::string &errormessage)
 123         {
 124                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 125                 {
 126                         if (notify)
 127                                 ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but their host can't be resolved from their %s!", them->nick.c_str(), them->host.c_str(), typ.c_str());
 128                 }
 129         }
 130
 131         virtual ~CGIResolver()
 132         {
 133         }
 134 };
 135
 136 class ModuleCgiIRC : public Module
 137 {
 138         CommandWebirc* mycommand;
 139         bool NotifyOpers;
 140         CGIHostlist Hosts;
 141 public:
 142         ModuleCgiIRC(InspIRCd* Me) : Module(Me)
 143         {
 144
 145                 OnRehash(NULL);
 146                 mycommand = new CommandWebirc(Me, Hosts, NotifyOpers);
 147                 ServerInstance->AddCommand(mycommand);
 148
 149                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 150                 ServerInstance->Modules->Attach(eventlist, this, 7);
 151         }
 152
 153
 154         virtual void Prioritize()
 155         {
 156                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 157         }
 158
 159         virtual void OnRehash(User* user)
 160         {
 161                 ConfigReader Conf(ServerInstance);
 162                 Hosts.clear();
 163
 164                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 165
 166                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 167                         NotifyOpers = true;
 168
 169                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 170                 {
 171                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 172                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 173                         std::string password = Conf.ReadValue("cgihost", "password", i);
 174
 175                         if(hostmask.length())
 176                         {
 177                                 if (type == "webirc" && !password.length()) {
 178                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 179                                 }
 180                                 else
 181                                 {
 182                                         CGItype cgitype = INVALID;
 183                                         if (type == "pass")
 184                                                 cgitype = PASS;
 185                                         else if (type == "ident")
 186                                                 cgitype = IDENT;
 187                                         else if (type == "passfirst")
 188                                                 cgitype = PASSFIRST;
 189                                         else if (type == "webirc")
 190                                         {
 191                                                 cgitype = WEBIRC;
 192                                         }
 193
 194                                         if (cgitype == INVALID)
 195                                                 cgitype = PASS;
 196
 197                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 198                                 }
 199                         }
 200                         else
 201                         {
 202                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 203                                 continue;
 204                         }
 205                 }
 206         }
 207
 208         virtual void OnCleanup(int target_type, void* item)
 209         {
 210                 if(target_type == TYPE_USER)
 211                 {
 212                         User* user = (User*)item;
 213                         std::string* realhost;
 214                         std::string* realip;
 215
 216                         if(user->GetExt("cgiirc_realhost", realhost))
 217                         {
 218                                 delete realhost;
 219                                 user->Shrink("cgiirc_realhost");
 220                         }
 221
 222                         if(user->GetExt("cgiirc_realip", realip))
 223                         {
 224                                 delete realip;
 225                                 user->Shrink("cgiirc_realip");
 226                         }
 227                 }
 228         }
 229
 230         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 231         {
 232                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 233                 {
 234                         std::string* data;
 235
 236                         if(user->GetExt(extname, data))
 237                         {
 238                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 239                         }
 240                 }
 241         }
 242
 243         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 244         {
 245                 if(target_type == TYPE_USER)
 246                 {
 247                         User* dest = (User*)target;
 248                         std::string* bleh;
 249                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 250                         {
 251                                 dest->Extend(extname, new std::string(extdata));
 252                         }
 253                 }
 254         }
 255
 256         virtual void OnUserDisconnect(User* user)
 257         {
 258                 OnCleanup(TYPE_USER, user);
 259         }
 260
 261
 262         virtual int OnUserRegister(User* user)
 263         {
 264                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 265                 {
 266                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 267                         {
 268                                 // Deal with it...
 269                                 if(iter->type == PASS)
 270                                 {
 271                                         CheckPass(user); // We do nothing if it fails so...
 272                                         user->CheckLines(true);
 273                                 }
 274                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 275                                 {
 276                                         // If the password lookup failed, try the ident
 277                                         CheckIdent(user);       // If this fails too, do nothing
 278                                         user->CheckLines(true);
 279                                 }
 280                                 else if(iter->type == IDENT)
 281                                 {
 282                                         CheckIdent(user); // Nothing on failure.
 283                                         user->CheckLines(true);
 284                                 }
 285                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 286                                 {
 287                                         // If the ident lookup fails, try the password.
 288                                         CheckPass(user);
 289                                         user->CheckLines(true);
 290                                 }
 291                                 else if(iter->type == WEBIRC)
 292                                 {
 293                                         // We don't need to do anything here
 294                                 }
 295                                 return 0;
 296                         }
 297                 }
 298                 return 0;
 299         }
 300
 301         virtual void OnUserConnect(User* user)
 302         {
 303                 std::string *webirc_hostname, *webirc_ip;
 304                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 305                 {
 306                         user->host.assign(*webirc_hostname, 0, 64);
 307                         user->dhost.assign(*webirc_hostname, 0, 64);
 308                         delete webirc_hostname;
 309                         user->InvalidateCache();
 310                         user->Shrink("cgiirc_webirc_hostname");
 311                 }
 312                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 313                 {
 314                         ServerInstance->Users->RemoveCloneCounts(user);
 315                         user->SetSockAddr(user->GetProtocolFamily(), webirc_ip->c_str(), user->GetPort());
 316                         delete webirc_ip;
 317                         user->InvalidateCache();
 318                         user->Shrink("cgiirc_webirc_ip");
 319                         ServerInstance->Users->AddLocalClone(user);
 320                         ServerInstance->Users->AddGlobalClone(user);
 321                         user->CheckClass();
 322                         user->CheckLines(true);
 323                 }
 324         }
 325
 326         bool CheckPass(User* user)
 327         {
 328                 if(IsValidHost(user->password))
 329                 {
 330                         user->Extend("cgiirc_realhost", new std::string(user->host));
 331                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 332                         user->host.assign(user->password, 0, 64);
 333                         user->dhost.assign(user->password, 0, 64);
 334                         user->InvalidateCache();
 335
 336                         bool valid = false;
 337                         ServerInstance->Users->RemoveCloneCounts(user);
 338 #ifdef IPV6
 339                         if (user->GetProtocolFamily() == AF_INET6)
 340                                 valid = (inet_pton(AF_INET6, user->password.c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 341                         else
 342                                 valid = (inet_aton(user->password.c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 343 #else
 344                         if (inet_aton(user->password.c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 345                                 valid = true;
 346 #endif
 347                         ServerInstance->Users->AddLocalClone(user);
 348                         ServerInstance->Users->AddGlobalClone(user);
 349                         user->CheckClass();
 350
 351                         if (valid)
 352                         {
 353                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 354                                 if(NotifyOpers)
 355                                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick.c_str(), user->host.c_str(), user->password.c_str());
 356                         }
 357                         else
 358                         {
 359                                 /* We got as resolved hostname in the password. */
 360                                 try
 361                                 {
 362
 363                                         bool cached;
 364                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 365                                         ServerInstance->AddResolver(r, cached);
 366                                 }
 367                                 catch (...)
 368                                 {
 369                                         if (NotifyOpers)
 370                                                 ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname!", user->nick.c_str(), user->host.c_str());
 371                                 }
 372                         }
 373
 374                         user->password.clear();
 375                         return true;
 376                 }
 377
 378                 return false;
 379         }
 380
 381         bool CheckIdent(User* user)
 382         {
 383                 int ip[4];
 384                 const char* ident;
 385                 char newip[16];
 386                 int len = user->ident.length();
 387
 388                 if(len == 8)
 389                         ident = user->ident.c_str();
 390                 else if(len == 9 && user->ident[0] == '~')
 391                         ident = user->ident.c_str() + 1;
 392                 else
 393                         return false;
 394
 395                 for(int i = 0; i < 4; i++)
 396                         if(!HexToInt(ip[i], ident + i*2))
 397                                 return false;
 398
 399                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 400
 401                 user->Extend("cgiirc_realhost", new std::string(user->host));
 402                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 403                 ServerInstance->Users->RemoveCloneCounts(user);
 404                 user->SetSockAddr(user->GetProtocolFamily(), newip, user->GetPort());
 405                 ServerInstance->Users->AddLocalClone(user);
 406                 ServerInstance->Users->AddGlobalClone(user);
 407                 user->CheckClass();
 408                 try
 409                 {
 410                         user->host.assign(newip, 0, 16);
 411                         user->dhost.assign(newip, 0, 16);
 412                         user->ident.assign("~cgiirc", 0, 8);
 413
 414                         bool cached;
 415                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 416                         ServerInstance->AddResolver(r, cached);
 417                 }
 418                 catch (...)
 419                 {
 420                         user->host.assign(newip, 0, 16);
 421                         user->dhost.assign(newip, 0, 16);
 422                         user->ident.assign("~cgiirc", 0, 8);
 423                         user->InvalidateCache();
 424
 425                         if(NotifyOpers)
 426                                  ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname!", user->nick.c_str(), user->host.c_str());
 427                 }
 428
 429                 return true;
 430         }
 431
 432         bool IsValidHost(const std::string &host)
 433         {
 434                 if(!host.size())
 435                         return false;
 436
 437                 for(unsigned int i = 0; i < host.size(); i++)
 438                 {
 439                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 440                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 441                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 442                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 443                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 444
 445                                 continue;
 446                         else
 447                                 return false;
 448                 }
 449
 450                 return true;
 451         }
 452
 453         bool IsValidIP(const std::string &ip)
 454         {
 455                 if(ip.size() < 7 || ip.size() > 15)
 456                         return false;
 457
 458                 short sincedot = 0;
 459                 short dots = 0;
 460
 461                 for(unsigned int i = 0; i < ip.size(); i++)
 462                 {
 463                         if((dots <= 3) && (sincedot <= 3))
 464                         {
 465                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 466                                 {
 467                                         sincedot++;
 468                                 }
 469                                 else if(ip[i] == '.')
 470                                 {
 471                                         sincedot = 0;
 472                                         dots++;
 473                                 }
 474                         }
 475                         else
 476                         {
 477                                 return false;
 478
 479                         }
 480                 }
 481
 482                 if(dots != 3)
 483                         return false;
 484
 485                 return true;
 486         }
 487
 488         bool HexToInt(int &out, const char* in)
 489         {
 490                 char ip[3];
 491                 ip[0] = in[0];
 492                 ip[1] = in[1];
 493                 ip[2] = 0;
 494                 out = strtol(ip, NULL, 16);
 495
 496                 if(out > 255 || out < 0)
 497                         return false;
 498
 499                 return true;
 500         }
 501
 502         virtual ~ModuleCgiIRC()
 503         {
 504         }
 505
 506         virtual Version GetVersion()
 507         {
 508                 return Version("$Id$",VF_VENDOR,API_VERSION);
 509         }
 510
 511 };
 512
 513 MODULE_INIT(ModuleCgiIRC)