/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007-2008 John Brooks <john.brooks@dereferenced.net>
* Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
* Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
* Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#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:
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
{
public:
bool notify;
StringExtItem realhost;
StringExtItem realip;
LocalStringExt webirc_hostname;
LocalStringExt webirc_ip;
CGIHostlist Hosts;
CommandWebirc(Module* Creator)
: Command(Creator, "WEBIRC", 4),
realhost("cgiirc_realhost", Creator), realip("cgiirc_realip", Creator),
webirc_hostname("cgiirc_webirc_hostname", Creator), webirc_ip("cgiirc_webirc_ip", Creator)
{
works_before_reg = true;
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)
{
realhost.set(user, user->host);
realip.set(user, 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());
webirc_hostname.set(user, parameters[2]);
webirc_ip.set(user, parameters[3]);
return CMD_SUCCESS;
}
}
}
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;
}
};
/** Resolver for CGI:IRC hostnames encoded in ident/GECOS
*/
class CGIResolver : public Resolver
{
std::string typ;
std::string theiruid;
LocalIntExt& waiting;
bool notify;
public:
CGIResolver(Module* me, bool NotifyOpers, const std::string &source, bool forward, LocalUser* u,
const std::string &type, bool &cached, LocalIntExt& ext)
: Resolver(source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theiruid(u->uuid),
waiting(ext), notify(NotifyOpers)
{
}
virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
{
/* Check the user still exists */
User* them = ServerInstance->FindUUID(theiruid);
if (them)
{
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());
if (result.length() > 64)
return;
them->host = result;
them->dhost = result;
them->InvalidateCache();
them->CheckLines(true);
}
}
virtual void OnError(ResolverError e, const std::string &errormessage)
{
User* them = ServerInstance->FindUUID(theiruid);
if (them)
{
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()
{
User* them = ServerInstance->FindUUID(theiruid);
if (!them)
return;
int count = waiting.get(them);
if (count)
waiting.set(them, count - 1);
}
};
class ModuleCgiIRC : public Module
{
CommandWebirc cmd;
LocalIntExt waiting;
public:
ModuleCgiIRC() : cmd(this), waiting("cgiirc-delay", this)
{
}
void init()
{
OnRehash(NULL);
ServerInstance->AddCommand(&cmd);
ServerInstance->Extensions.Register(&cmd.realhost);
ServerInstance->Extensions.Register(&cmd.realip);
ServerInstance->Extensions.Register(&cmd.webirc_hostname);
ServerInstance->Extensions.Register(&cmd.webirc_ip);
Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCheckReady, I_OnUserConnect };
ServerInstance->Modules->Attach(eventlist, this, 4);
}
void Prioritize()
{
ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
Module* umodes = ServerInstance->Modules->Find("m_conn_umodes.so");
ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_BEFORE, &umodes);
}
void OnRehash(User* user)
{
cmd.Hosts.clear();
// Do we send an oper notice when a CGI:IRC has their host changed?
cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true);
ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost");
for (ConfigIter i = tags.first; i != tags.second; ++i)
{
ConfigTag* tag = i->second;
std::string hostmask = tag->getString("mask"); // An allowed CGI:IRC host
std::string type = tag->getString("type"); // What type of user-munging we do on this host.
std::string password = tag->getString("password");
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;
cmd.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;
}
}
}
ModResult OnCheckReady(LocalUser *user)
{
if (waiting.get(user))
return MOD_RES_DENY;
return MOD_RES_PASSTHRU;
}
ModResult OnUserRegister(LocalUser* user)
{
for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.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 MOD_RES_PASSTHRU;
}
}
return MOD_RES_PASSTHRU;
}
virtual void OnUserConnect(LocalUser* user)
{
std::string *webirc_hostname = cmd.webirc_hostname.get(user);
std::string *webirc_ip = cmd.webirc_ip.get(user);
if (!webirc_ip)
return;
ServerInstance->Users->RemoveCloneCounts(user);
user->SetClientIP(webirc_ip->c_str());
user->InvalidateCache();
if (webirc_hostname && webirc_hostname->length() < 64)
user->host = user->dhost = *webirc_hostname;
else
user->host = user->dhost = user->GetIPString();
user->InvalidateCache();
ServerInstance->Users->AddLocalClone(user);
ServerInstance->Users->AddGlobalClone(user);
user->SetClass();
user->CheckClass();
user->CheckLines(true);
cmd.webirc_ip.unset(user);
cmd.webirc_hostname.unset(user);
}
bool CheckPass(LocalUser* user)
{
if(IsValidHost(user->password))
{
cmd.realhost.set(user, user->host);
cmd.realip.set(user, user->GetIPString());
user->host = user->password;
user->dhost = user->password;
user->InvalidateCache();
ServerInstance->Users->RemoveCloneCounts(user);
user->SetClientIP(user->password.c_str());
ServerInstance->Users->AddLocalClone(user);
ServerInstance->Users->AddGlobalClone(user);
user->SetClass();
user->CheckClass();
try
{
bool cached;
CGIResolver* r = new CGIResolver(this, cmd.notify, user->password, false, user, "PASS", cached, waiting);
ServerInstance->AddResolver(r, cached);
waiting.set(user, waiting.get(user) + 1);
}
catch (...)
{
if (cmd.notify)
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(LocalUser* user)
{
const char* ident;
int len = user->ident.length();
in_addr newip;
if(len == 8)
ident = user->ident.c_str();
else if(len == 9 && user->ident[0] == '~')
ident = user->ident.c_str() + 1;
else
return false;
errno = 0;
unsigned long ipaddr = strtoul(ident, NULL, 16);
if (errno)
return false;
newip.s_addr = htonl(ipaddr);
char* newipstr = inet_ntoa(newip);
cmd.realhost.set(user, user->host);
cmd.realip.set(user, user->GetIPString());
ServerInstance->Users->RemoveCloneCounts(user);
user->SetClientIP(newipstr);
ServerInstance->Users->AddLocalClone(user);
ServerInstance->Users->AddGlobalClone(user);
user->SetClass();
user->CheckClass();
user->host = newipstr;
user->dhost = newipstr;
user->ident.assign("~cgiirc", 0, 8);
try
{
bool cached;
CGIResolver* r = new CGIResolver(this, cmd.notify, newipstr, false, user, "IDENT", cached, waiting);
ServerInstance->AddResolver(r, cached);
waiting.set(user, waiting.get(user) + 1);
}
catch (...)
{
user->InvalidateCache();
if(cmd.notify)
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() || host.size() > 64)
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;
}
virtual ~ModuleCgiIRC()
{
}
virtual Version GetVersion()
{
return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
}
};
MODULE_INIT(ModuleCgiIRC)
