/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2009 InspIRCd Development Team
* See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
#ifndef WINDOWS
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
/* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
enum CGItype { INVALID, PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
/** Holds a CGI site's details
*/
class CGIhost : public classbase
{
public:
std::string hostmask;
CGItype type;
std::string password;
CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST, const std::string &spassword ="")
: hostmask(mask), type(t), password(spassword)
{
}
};
typedef std::vector<CGIhost> CGIHostlist;
/*
* WEBIRC
* This is used for the webirc method of CGIIRC auth, and is (really) the best way to do these things.
* Syntax: WEBIRC password client hostname ip
* Where password is a shared key, client is the name of the "client" and version (e.g. cgiirc), hostname
* is the resolved host of the client issuing the command and IP is the real IP of the client.
*
* How it works:
* To tie in with the rest of cgiirc module, and to avoid race conditions, /webirc is only processed locally
* and simply sets metadata on the user, which is later decoded on full connect to give something meaningful.
*/
class CommandWebirc : public Command
{
CGIHostlist Hosts;
bool& notify;
public:
CommandWebirc(InspIRCd* Instance, bool& bnotify) : Command(Instance, "WEBIRC", 0, 4, true), notify(bnotify)
{
this->source = "m_cgiirc.so";
this->syntax = "password client hostname ip";
}
CmdResult Handle(const std::vector<std::string> ¶meters, User *user)
{
if(user->registered == REG_ALL)
return CMD_FAILURE;
for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
{
if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
{
if(iter->type == WEBIRC && parameters[0] == iter->password)
{
user->Extend("cgiirc_realhost", new std::string(user->host));
user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
if (notify)
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());
user->Extend("cgiirc_webirc_hostname", new std::string(parameters[2]));
user->Extend("cgiirc_webirc_ip", new std::string(parameters[3]));
return CMD_LOCALONLY;
}
}
}
ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
return CMD_FAILURE;
}
void SetHosts(CGIHostlist &phosts)
{
this->Hosts = phosts;
}
};
/** Resolver for CGI:IRC hostnames encoded in ident/GECOS
*/
class CGIResolver : public Resolver
{
std::string typ;
int theirfd;
User* them;
bool notify;
public:
CGIResolver(Module* me, InspIRCd* Instance, bool NotifyOpers, const std::string &source, bool forward, User* u, int userfd, const std::string &type, bool &cached)
: Resolver(Instance, source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
{
/* Check the user still exists */
if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
{
if (notify)
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());
them->host.assign(result,0, 64);
them->dhost.assign(result, 0, 64);
them->ident.assign("~cgiirc", 0, 8);
them->InvalidateCache();
them->CheckLines(true);
}
}
virtual void OnError(ResolverError e, const std::string &errormessage)
{
if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
{
if (notify)
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());
}
}
virtual ~CGIResolver()
{
}
};
class ModuleCgiIRC : public Module
{
CommandWebirc* mycommand;
bool NotifyOpers;
CGIHostlist Hosts;
public:
ModuleCgiIRC(InspIRCd* Me) : Module(Me)
{
mycommand = new CommandWebirc(Me, NotifyOpers);
OnRehash(NULL);
ServerInstance->AddCommand(mycommand);
Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
ServerInstance->Modules->Attach(eventlist, this, 7);
}
virtual void Prioritize()
{
ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
}
virtual void OnRehash(User* user)
{
ConfigReader Conf(ServerInstance);
Hosts.clear();
NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
NotifyOpers = true;
for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
{
std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
std::string password = Conf.ReadValue("cgihost", "password", i);
if(hostmask.length())
{
if (type == "webirc" && !password.length()) {
ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
}
else
{
CGItype cgitype = INVALID;
if (type == "pass")
cgitype = PASS;
else if (type == "ident")
cgitype = IDENT;
else if (type == "passfirst")
cgitype = PASSFIRST;
else if (type == "webirc")
{
cgitype = WEBIRC;
}
if (cgitype == INVALID)
cgitype = PASS;
Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
}
}
else
{
ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
continue;
}
}
mycommand->SetHosts(Hosts);
}
virtual void OnCleanup(int target_type, void* item)
{
if(target_type == TYPE_USER)
{
User* user = (User*)item;
std::string* realhost;
std::string* realip;
if(user->GetExt("cgiirc_realhost", realhost))
{
delete realhost;
user->Shrink("cgiirc_realhost");
}
if(user->GetExt("cgiirc_realip", realip))
{
delete realip;
user->Shrink("cgiirc_realip");
}
}
}
virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
{
if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
{
std::string* data;
if(user->GetExt(extname, data))
{
proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
}
}
}
virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
{
if(target_type == TYPE_USER)
{
User* dest = (User*)target;
std::string* bleh;
if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
{
dest->Extend(extname, new std::string(extdata));
}
}
}
virtual void OnUserDisconnect(User* user)
{
OnCleanup(TYPE_USER, user);
}
virtual int OnUserRegister(User* user)
{
for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
{
if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
{
// Deal with it...
if(iter->type == PASS)
{
CheckPass(user); // We do nothing if it fails so...
user->CheckLines(true);
}
else if(iter->type == PASSFIRST && !CheckPass(user))
{
// If the password lookup failed, try the ident
CheckIdent(user); // If this fails too, do nothing
user->CheckLines(true);
}
else if(iter->type == IDENT)
{
CheckIdent(user); // Nothing on failure.
user->CheckLines(true);
}
else if(iter->type == IDENTFIRST && !CheckIdent(user))
{
// If the ident lookup fails, try the password.
CheckPass(user);
user->CheckLines(true);
}
else if(iter->type == WEBIRC)
{
// We don't need to do anything here
}
return 0;
}
}
return 0;
}
virtual void OnUserConnect(User* user)
{
std::string *webirc_hostname, *webirc_ip;
if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
{
ServerInstance->Users->RemoveCloneCounts(user);
user->SetSockAddr(user->GetProtocolFamily(), webirc_ip->c_str(), user->GetPort());
delete webirc_ip;
user->InvalidateCache();
if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname) && webirc_hostname->length() < 64)
{
user->host = *webirc_hostname;
user->dhost = *webirc_hostname;
delete webirc_hostname;
}
else
{
user->host = user->dhost = user->GetIPString();
}
user->Shrink("cgiirc_webirc_hostname");
user->Shrink("cgiirc_webirc_ip");
ServerInstance->Users->AddLocalClone(user);
ServerInstance->Users->AddGlobalClone(user);
user->SetClass();
user->CheckClass();
user->CheckLines(true);
}
}
bool CheckPass(User* user)
{
if(IsValidHost(user->password))
{
user->Extend("cgiirc_realhost", new std::string(user->host));
user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
user->host.assign(user->password, 0, 64);
user->dhost.assign(user->password, 0, 64);
user->InvalidateCache();
ServerInstance->Users->RemoveCloneCounts(user);
user->SetSockAddr(user->GetProtocolFamily(), user->password.c_str(), user->GetPort());
user->InvalidateCache();
ServerInstance->Users->AddLocalClone(user);
ServerInstance->Users->AddGlobalClone(user);
user->SetClass();
user->CheckClass();
try
{
user->host = user->password;
user->dhost = user->password;
user->ident = "~cgiirc";
bool cached;
CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
ServerInstance->AddResolver(r, cached);
}
catch (...)
{
if(NotifyOpers)
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());
}
user->password.clear();
return true;
}
return false;
}
bool CheckIdent(User* user)
{
int ip[4];
const char* ident;
char newip[16];
int len = user->ident.length();
if(len == 8)
ident = user->ident.c_str();
else if(len == 9 && user->ident[0] == '~')
ident = user->ident.c_str() + 1;
else
return false;
for(int i = 0; i < 4; i++)
if(!HexToInt(ip[i], ident + i*2))
return false;
snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
user->Extend("cgiirc_realhost", new std::string(user->host));
user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
ServerInstance->Users->RemoveCloneCounts(user);
user->SetSockAddr(user->GetProtocolFamily(), newip, user->GetPort());
ServerInstance->Users->AddLocalClone(user);
ServerInstance->Users->AddGlobalClone(user);
user->SetClass();
user->CheckClass();
try
{
user->host.assign(newip, 0, 16);
user->dhost.assign(newip, 0, 16);
user->ident.assign("~cgiirc", 0, 8);
bool cached;
CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
ServerInstance->AddResolver(r, cached);
}
catch (...)
{
user->host.assign(newip, 0, 16);
user->dhost.assign(newip, 0, 16);
user->ident.assign("~cgiirc", 0, 8);
user->InvalidateCache();
if(NotifyOpers)
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());
}
return true;
}
bool IsValidHost(const std::string &host)
{
if(!host.size())
return false;
for(unsigned int i = 0; i < host.size(); i++)
{
if( ((host[i] >= '0') && (host[i] <= '9')) ||
((host[i] >= 'A') && (host[i] <= 'Z')) ||
((host[i] >= 'a') && (host[i] <= 'z')) ||
((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
continue;
else
return false;
}
return true;
}
bool IsValidIP(const std::string &ip)
{
if(ip.size() < 7 || ip.size() > 15)
return false;
short sincedot = 0;
short dots = 0;
for(unsigned int i = 0; i < ip.size(); i++)
{
if((dots <= 3) && (sincedot <= 3))
{
if((ip[i] >= '0') && (ip[i] <= '9'))
{
sincedot++;
}
else if(ip[i] == '.')
{
sincedot = 0;
dots++;
}
}
else
{
return false;
}
}
if(dots != 3)
return false;
return true;
}
bool HexToInt(int &out, const char* in)
{
char ip[3];
ip[0] = in[0];
ip[1] = in[1];
ip[2] = 0;
out = strtol(ip, NULL, 16);
if(out > 255 || out < 0)
return false;
return true;
}
virtual ~ModuleCgiIRC()
{
}
virtual Version GetVersion()
{
return Version("$Id$",VF_VENDOR,API_VERSION);
}
};
MODULE_INIT(ModuleCgiIRC)
