/*
* 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"
#include "xline.h"
#include "modules/dns.h"
enum CGItype { IDENT, WEBIRC };
// We need this method up here so that it can be accessed from anywhere
static void ChangeIP(User* user, const std::string& newip)
{
ServerInstance->Users->RemoveCloneCounts(user);
user->SetClientIP(newip.c_str());
ServerInstance->Users->AddClone(user);
}
/** Holds a CGI site's details
*/
class CGIhost
{
public:
std::string hostmask;
CGItype type;
std::string password;
CGIhost(const std::string &mask, CGItype t, 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 gateway hostname ip
* Where password is a shared key, gateway is the name of the WebIRC gateway 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 SplitCommand
{
public:
bool notify;
StringExtItem gateway;
StringExtItem realhost;
StringExtItem realip;
CGIHostlist Hosts;
CommandWebIRC(Module* Creator)
: SplitCommand(Creator, "WEBIRC", 4)
, gateway("cgiirc_gateway", ExtensionItem::EXT_USER, Creator)
, realhost("cgiirc_realhost", ExtensionItem::EXT_USER, Creator)
, realip("cgiirc_realip", ExtensionItem::EXT_USER, Creator)
{
allow_empty_last_param = false;
works_before_reg = true;
this->syntax = "password gateway hostname ip";
}
CmdResult HandleLocal(const std::vector<std::string>& parameters, LocalUser* user)
{
if(user->registered == REG_ALL)
return CMD_FAILURE;
irc::sockets::sockaddrs ipaddr;
if (!irc::sockets::aptosa(parameters[3], 0, ipaddr))
{
user->CommandFloodPenalty += 5000;
ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC but gave an invalid IP address.", user->GetFullRealHost().c_str());
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)
{
gateway.set(user, parameters[1]);
realhost.set(user, user->host);
realip.set(user, user->GetIPString());
// Check if we're happy with the provided hostname. If it's problematic then make sure we won't set a host later, just the IP
bool host_ok = (parameters[2].length() <= ServerInstance->Config->Limits.MaxHost) && (parameters[2].find_first_not_of("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-") == std::string::npos);
const std::string& newhost = (host_ok ? parameters[2] : parameters[3]);
if (notify)
ServerInstance->SNO->WriteGlobalSno('w', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick.c_str(), user->host.c_str(), newhost.c_str(), user->host.c_str());
// Where the magic happens - change their IP
ChangeIP(user, parameters[3]);
// And follow this up by changing their host
user->host = user->dhost = newhost;
user->InvalidateCache();
return CMD_SUCCESS;
}
}
}
user->CommandFloodPenalty += 5000;
ServerInstance->SNO->WriteGlobalSno('w', "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 DNS::Request
{
std::string theiruid;
LocalIntExt& waiting;
bool notify;
public:
CGIResolver(DNS::Manager* mgr, Module* me, bool NotifyOpers, const std::string &source, LocalUser* u, LocalIntExt& ext)
: DNS::Request(mgr, me, source, DNS::QUERY_PTR)
, theiruid(u->uuid)
, waiting(ext)
, notify(NotifyOpers)
{
}
void OnLookupComplete(const DNS::Query *r) CXX11_OVERRIDE
{
/* Check the user still exists */
User* them = ServerInstance->FindUUID(theiruid);
if ((them) && (!them->quitting))
{
LocalUser* lu = IS_LOCAL(them);
if (!lu)
return;
const DNS::ResourceRecord &ans_record = r->answers[0];
if (ans_record.rdata.empty() || ans_record.rdata.length() > ServerInstance->Config->Limits.MaxHost)
return;
if (notify)
ServerInstance->SNO->WriteGlobalSno('w', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s", them->nick.c_str(), them->host.c_str(), ans_record.rdata.c_str());
them->host = them->dhost = ans_record.rdata;
them->InvalidateCache();
lu->CheckLines(true);
}
}
void OnError(const DNS::Query *r) CXX11_OVERRIDE
{
if (!notify)
return;
User* them = ServerInstance->FindUUID(theiruid);
if ((them) && (!them->quitting))
{
ServerInstance->SNO->WriteToSnoMask('w', "Connecting user %s detected as using CGI:IRC (%s), but their host can't be resolved!", them->nick.c_str(), them->host.c_str());
}
}
~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;
dynamic_reference<DNS::Manager> DNS;
static void RecheckClass(LocalUser* user)
{
user->MyClass = NULL;
user->SetClass();
user->CheckClass();
}
void HandleIdent(LocalUser* user, const std::string& newip)
{
cmd.realhost.set(user, user->host);
cmd.realip.set(user, user->GetIPString());
ChangeIP(user, newip);
user->host = user->dhost = user->GetIPString();
user->InvalidateCache();
RecheckClass(user);
// Don't create the resolver if the core couldn't put the user in a connect class or when dns is disabled
if (user->quitting || !DNS || !user->MyClass->resolvehostnames)
return;
CGIResolver* r = new CGIResolver(*this->DNS, this, cmd.notify, newip, user, waiting);
try
{
waiting.set(user, waiting.get(user) + 1);
this->DNS->Process(r);
}
catch (DNS::Exception &ex)
{
int count = waiting.get(user);
if (count)
waiting.set(user, count - 1);
delete r;
if (cmd.notify)
ServerInstance->SNO->WriteToSnoMask('w', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname; %s", user->nick.c_str(), user->host.c_str(), ex.GetReason().c_str());
}
}
public:
ModuleCgiIRC()
: cmd(this)
, waiting("cgiirc-delay", ExtensionItem::EXT_USER, this)
, DNS(this, "DNS")
{
}
void init() CXX11_OVERRIDE
{
ServerInstance->SNO->EnableSnomask('w', "CGIIRC");
}
void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
{
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.empty())
{
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Missing password in config: %s", hostmask.c_str());
}
else
{
CGItype cgitype;
if (type == "ident")
cgitype = IDENT;
else if (type == "webirc")
cgitype = WEBIRC;
else
{
cgitype = IDENT;
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Invalid <cgihost:type> value in config: %s, setting it to \"ident\"", type.c_str());
}
cmd.Hosts.push_back(CGIhost(hostmask, cgitype, password));
}
}
else
{
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
continue;
}
}
}
ModResult OnCheckReady(LocalUser *user) CXX11_OVERRIDE
{
if (waiting.get(user))
return MOD_RES_DENY;
if (!cmd.realip.get(user))
return MOD_RES_PASSTHRU;
RecheckClass(user);
if (user->quitting)
return MOD_RES_DENY;
user->CheckLines(true);
if (user->quitting)
return MOD_RES_DENY;
return MOD_RES_PASSTHRU;
}
ModResult OnSetConnectClass(LocalUser* user, ConnectClass* myclass) CXX11_OVERRIDE
{
// If <connect:webirc> is not set then we have nothing to do.
const std::string webirc = myclass->config->getString("webirc");
if (webirc.empty())
return MOD_RES_PASSTHRU;
// If the user is not connecting via a WebIRC gateway then they
// cannot match this connect class.
const std::string* gateway = cmd.gateway.get(user);
if (!gateway)
return MOD_RES_DENY;
// If the gateway matches the <connect:webirc> constraint then
// allow the check to continue. Otherwise, reject it.
return InspIRCd::Match(*gateway, webirc) ? MOD_RES_PASSTHRU : MOD_RES_DENY;
}
ModResult OnUserRegister(LocalUser* user) CXX11_OVERRIDE
{
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 == IDENT)
{
CheckIdent(user); // Nothing on failure.
user->CheckLines(true);
}
else if(iter->type == WEBIRC)
{
// We don't need to do anything here
}
return MOD_RES_PASSTHRU;
}
}
return MOD_RES_PASSTHRU;
}
bool CheckIdent(LocalUser* user)
{
const char* ident;
in_addr newip;
if (user->ident.length() == 8)
ident = user->ident.c_str();
else if (user->ident.length() == 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);
std::string newipstr(inet_ntoa(newip));
user->ident = "~cgiirc";
HandleIdent(user, newipstr);
return true;
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
}
};
MODULE_INIT(ModuleCgiIRC)
