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         bool notify;
  57  public:
  58         StringExtItem realhost;
  59         StringExtItem realip;
  60         LocalStringExt webirc_hostname;
  61         LocalStringExt webirc_ip;
  62
  63         CGIHostlist Hosts;
  64         CommandWebirc(Module* Creator, bool bnotify)
  65                 : Command(Creator, "WEBIRC", 4), notify(bnotify),
  66                   realhost("cgiirc_realhost", Creator), realip("cgiirc_realip", Creator),
  67                   webirc_hostname("cgiirc_webirc_hostname", Creator), webirc_ip("cgiirc_webirc_ip", Creator)
  68                 {
  69                         works_before_reg = true;
  70                         this->syntax = "password client hostname ip";
  71                 }
  72                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  73                 {
  74                         if(user->registered == REG_ALL)
  75                                 return CMD_FAILURE;
  76
  77                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  78                         {
  79                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  80                                 {
  81                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  82                                         {
  83                                                 realhost.set(user, user->host);
  84                                                 realip.set(user, user->GetIPString());
  85                                                 if (notify)
  86                                                         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());
  87                                                 webirc_hostname.set(user, parameters[2]);
  88                                                 webirc_ip.set(user, parameters[3]);
  89                                                 return CMD_SUCCESS;
  90                                         }
  91                                 }
  92                         }
  93
  94                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
  95                         return CMD_FAILURE;
  96                 }
  97 };
  98
  99
 100 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
 101  */
 102 class CGIResolver : public Resolver
 103 {
 104         std::string typ;
 105         int theirfd;
 106         User* them;
 107         bool notify;
 108  public:
 109         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, bool forward, User* u, int userfd, const std::string &type, bool &cached)
 110                 : Resolver(source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
 111
 112         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 113         {
 114                 /* Check the user still exists */
 115                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 116                 {
 117                         if (notify)
 118                                 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());
 119
 120                         them->host.assign(result,0, 64);
 121                         them->dhost.assign(result, 0, 64);
 122                         if (querytype)
 123                                 them->SetClientIP(result.c_str());
 124                         them->ident.assign("~cgiirc", 0, 8);
 125                         them->InvalidateCache();
 126                         them->CheckLines(true);
 127                 }
 128         }
 129
 130         virtual void OnError(ResolverError e, const std::string &errormessage)
 131         {
 132                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 133                 {
 134                         if (notify)
 135                                 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());
 136                 }
 137         }
 138
 139         virtual ~CGIResolver()
 140         {
 141         }
 142 };
 143
 144 class ModuleCgiIRC : public Module
 145 {
 146         CommandWebirc cmd;
 147         bool NotifyOpers;
 148 public:
 149         ModuleCgiIRC() : cmd(this, NotifyOpers)
 150         {
 151                 OnRehash(NULL);
 152                 ServerInstance->AddCommand(&cmd);
 153                 Extensible::Register(&cmd.realhost);
 154                 Extensible::Register(&cmd.realip);
 155                 Extensible::Register(&cmd.webirc_hostname);
 156                 Extensible::Register(&cmd.webirc_ip);
 157
 158                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUser, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 159                 ServerInstance->Modules->Attach(eventlist, this, 7);
 160         }
 161
 162
 163         virtual void Prioritize()
 164         {
 165                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 166         }
 167
 168         virtual void OnRehash(User* user)
 169         {
 170                 ConfigReader Conf;
 171                 cmd.Hosts.clear();
 172
 173                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 174
 175                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 176                         NotifyOpers = true;
 177
 178                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 179                 {
 180                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 181                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 182                         std::string password = Conf.ReadValue("cgihost", "password", i);
 183
 184                         if(hostmask.length())
 185                         {
 186                                 if (type == "webirc" && !password.length()) {
 187                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 188                                 }
 189                                 else
 190                                 {
 191                                         CGItype cgitype = INVALID;
 192                                         if (type == "pass")
 193                                                 cgitype = PASS;
 194                                         else if (type == "ident")
 195                                                 cgitype = IDENT;
 196                                         else if (type == "passfirst")
 197                                                 cgitype = PASSFIRST;
 198                                         else if (type == "webirc")
 199                                         {
 200                                                 cgitype = WEBIRC;
 201                                         }
 202
 203                                         if (cgitype == INVALID)
 204                                                 cgitype = PASS;
 205
 206                                         cmd.Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 207                                 }
 208                         }
 209                         else
 210                         {
 211                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 212                                 continue;
 213                         }
 214                 }
 215         }
 216
 217         virtual ModResult OnUserRegister(User* user)
 218         {
 219                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 220                 {
 221                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 222                         {
 223                                 // Deal with it...
 224                                 if(iter->type == PASS)
 225                                 {
 226                                         CheckPass(user); // We do nothing if it fails so...
 227                                         user->CheckLines(true);
 228                                 }
 229                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 230                                 {
 231                                         // If the password lookup failed, try the ident
 232                                         CheckIdent(user);       // If this fails too, do nothing
 233                                         user->CheckLines(true);
 234                                 }
 235                                 else if(iter->type == IDENT)
 236                                 {
 237                                         CheckIdent(user); // Nothing on failure.
 238                                         user->CheckLines(true);
 239                                 }
 240                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 241                                 {
 242                                         // If the ident lookup fails, try the password.
 243                                         CheckPass(user);
 244                                         user->CheckLines(true);
 245                                 }
 246                                 else if(iter->type == WEBIRC)
 247                                 {
 248                                         // We don't need to do anything here
 249                                 }
 250                                 return MOD_RES_PASSTHRU;
 251                         }
 252                 }
 253                 return MOD_RES_PASSTHRU;
 254         }
 255
 256         virtual void OnUserConnect(User* user)
 257         {
 258                 std::string *webirc_hostname = cmd.webirc_hostname.get(user);
 259                 std::string *webirc_ip = cmd.webirc_ip.get(user);
 260                 if (webirc_hostname)
 261                 {
 262                         user->host.assign(*webirc_hostname, 0, 64);
 263                         user->dhost.assign(*webirc_hostname, 0, 64);
 264                         user->InvalidateCache();
 265                         cmd.webirc_hostname.unset(user);
 266                 }
 267                 if (webirc_ip)
 268                 {
 269                         ServerInstance->Users->RemoveCloneCounts(user);
 270                         user->SetClientIP(webirc_ip->c_str());
 271                         user->InvalidateCache();
 272                         cmd.webirc_ip.unset(user);
 273                         ServerInstance->Users->AddLocalClone(user);
 274                         ServerInstance->Users->AddGlobalClone(user);
 275                         user->CheckClass();
 276                         user->CheckLines(true);
 277                 }
 278         }
 279
 280         bool CheckPass(User* user)
 281         {
 282                 if(IsValidHost(user->password))
 283                 {
 284                         cmd.realhost.set(user, user->host);
 285                         cmd.realip.set(user, user->GetIPString());
 286                         user->host.assign(user->password, 0, 64);
 287                         user->dhost.assign(user->password, 0, 64);
 288                         user->InvalidateCache();
 289
 290                         bool valid = false;
 291                         ServerInstance->Users->RemoveCloneCounts(user);
 292                         valid = user->SetClientIP(user->password.c_str());
 293                         ServerInstance->Users->AddLocalClone(user);
 294                         ServerInstance->Users->AddGlobalClone(user);
 295                         user->CheckClass();
 296
 297                         if (valid)
 298                         {
 299                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 300                                 if(NotifyOpers)
 301                                         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());
 302                         }
 303                         else
 304                         {
 305                                 /* We got as resolved hostname in the password. */
 306                                 try
 307                                 {
 308
 309                                         bool cached;
 310                                         CGIResolver* r = new CGIResolver(this, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 311                                         ServerInstance->AddResolver(r, cached);
 312                                 }
 313                                 catch (...)
 314                                 {
 315                                         if (NotifyOpers)
 316                                                 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());
 317                                 }
 318                         }
 319
 320                         user->password.clear();
 321                         return true;
 322                 }
 323
 324                 return false;
 325         }
 326
 327         bool CheckIdent(User* user)
 328         {
 329                 const char* ident;
 330                 int len = user->ident.length();
 331                 in_addr newip;
 332
 333                 if(len == 8)
 334                         ident = user->ident.c_str();
 335                 else if(len == 9 && user->ident[0] == '~')
 336                         ident = user->ident.c_str() + 1;
 337                 else
 338                         return false;
 339
 340                 errno = 0;
 341                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 342                 if (errno)
 343                         return false;
 344                 newip.s_addr = htonl(ipaddr);
 345                 char* newipstr = inet_ntoa(newip);
 346
 347                 cmd.realhost.set(user, user->host);
 348                 cmd.realip.set(user, user->GetIPString());
 349                 ServerInstance->Users->RemoveCloneCounts(user);
 350                 user->SetClientIP(newipstr);
 351                 ServerInstance->Users->AddLocalClone(user);
 352                 ServerInstance->Users->AddGlobalClone(user);
 353                 user->CheckClass();
 354                 user->host = newipstr;
 355                 user->dhost = newipstr;
 356                 user->ident.assign("~cgiirc", 0, 8);
 357                 try
 358                 {
 359
 360                         bool cached;
 361                         CGIResolver* r = new CGIResolver(this, NotifyOpers, newipstr, false, user, user->GetFd(), "IDENT", cached);
 362                         ServerInstance->AddResolver(r, cached);
 363                 }
 364                 catch (...)
 365                 {
 366                         user->InvalidateCache();
 367
 368                         if(NotifyOpers)
 369                                  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());
 370                 }
 371
 372                 return true;
 373         }
 374
 375         bool IsValidHost(const std::string &host)
 376         {
 377                 if(!host.size())
 378                         return false;
 379
 380                 for(unsigned int i = 0; i < host.size(); i++)
 381                 {
 382                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 383                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 384                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 385                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 386                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 387
 388                                 continue;
 389                         else
 390                                 return false;
 391                 }
 392
 393                 return true;
 394         }
 395
 396         bool IsValidIP(const std::string &ip)
 397         {
 398                 if(ip.size() < 7 || ip.size() > 15)
 399                         return false;
 400
 401                 short sincedot = 0;
 402                 short dots = 0;
 403
 404                 for(unsigned int i = 0; i < ip.size(); i++)
 405                 {
 406                         if((dots <= 3) && (sincedot <= 3))
 407                         {
 408                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 409                                 {
 410                                         sincedot++;
 411                                 }
 412                                 else if(ip[i] == '.')
 413                                 {
 414                                         sincedot = 0;
 415                                         dots++;
 416                                 }
 417                         }
 418                         else
 419                         {
 420                                 return false;
 421
 422                         }
 423                 }
 424
 425                 if(dots != 3)
 426                         return false;
 427
 428                 return true;
 429         }
 430
 431         virtual ~ModuleCgiIRC()
 432         {
 433         }
 434
 435         virtual Version GetVersion()
 436         {
 437                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR,API_VERSION);
 438         }
 439
 440 };
 441
 442 MODULE_INIT(ModuleCgiIRC)