/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2011 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"
#include "dns.h"
/* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
enum CGItype { INVALID, PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
struct CGIData {
/** Name of the CGI:IRC server as defined in its <cgiirc> block */
std::string name;
/** Original host/ip */
std::string host, ip;
};
class CGIExtItem : public SimpleExtItem<CGIData>
{
public:
CGIExtItem(Module* parent) : SimpleExtItem<CGIData>(EXTENSIBLE_USER, "cgiirc", parent) {}
std::string serialize(SerializeFormat format, const Extensible* container, void* item) const
{
CGIData* d = static_cast<CGIData*>(item);
if (d && format == FORMAT_USER)
return d->name + " " + d->host + " " + d->ip;
return "";
}
};
/** Holds a CGI site's details
*/
class CGIhost
{
public:
std::string name;
std::string hostmask;
CGItype type;
std::string password;
CGIhost(ConfigTag* tag, const std::string& mask, CGItype t)
: hostmask(mask), type(t)
{
name = tag->getString("name", mask);
password = tag->getString("password");
}
};
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;
CGIExtItem cgiext;
CGIHostlist Hosts;
CommandWebirc(Module* Creator)
: Command(Creator, "WEBIRC", 4), cgiext(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)
{
CGIData* data = new CGIData;
data->name = iter->name;
data->host = user->host;
data->ip = user->GetIPString();
cgiext.set(user, data);
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());
ServerInstance->Users->RemoveCloneCounts(user);
user->InvalidateCache();
user->SetClientIP(parameters[3].c_str());
if (parameters[2].length() >= 64 || parameters[2] == parameters[3])
user->host = user->dhost = user->GetIPString();
else
user->host = user->dhost = parameters[2];
ServerInstance->Users->AddLocalClone(user);
ServerInstance->Users->AddGlobalClone(user);
user->CheckLines(true);
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(EXTENSIBLE_USER, "cgiirc-delay", this)
{
}
void init()
{
ServerInstance->Modules->AddService(cmd);
ServerInstance->Modules->AddService(cmd.cgiext);
ServerInstance->Modules->AddService(waiting);
Implementation eventlist[] = { I_OnUserRegister, I_OnCheckReady };
ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
}
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 ReadConfig(ConfigReadStatus& status)
{
cmd.Hosts.clear();
// Do we send an oper notice when a CGI:IRC has their host changed?
cmd.notify = status.GetTag("cgiirc")->getBool("opernotice", true);
ConfigTagList tags = ServerInstance->Config->GetTags("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", "pass");
if(!hostmask.length())
{
status.ReportError(tag, "invalid <cgihost:mask>", false);
continue;
}
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;
else
{
status.ReportError(tag, "invalid <cgihost:type>", false);
continue;
}
cmd.Hosts.push_back(CGIhost(tag,hostmask,cgitype));
}
}
ModResult OnCheckReady(LocalUser *user)
{
if (waiting.get(user))
return MOD_RES_DENY;
return MOD_RES_PASSTHRU;
}
void 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(iter->name, user); // We do nothing if it fails so...
user->CheckLines(true);
}
else if(iter->type == PASSFIRST && !CheckPass(iter->name, user))
{
// If the password lookup failed, try the ident
CheckIdent(iter->name, user); // If this fails too, do nothing
user->CheckLines(true);
}
else if(iter->type == IDENT)
{
CheckIdent(iter->name, user); // Nothing on failure.
user->CheckLines(true);
}
else if(iter->type == IDENTFIRST && !CheckIdent(iter->name, user))
{
// If the ident lookup fails, try the password.
CheckPass(iter->name, user);
user->CheckLines(true);
}
else if(iter->type == WEBIRC)
{
// We don't need to do anything here
}
return;
}
}
}
bool CheckPass(const std::string& name, LocalUser* user)
{
if(IsValidHost(user->password))
{
CGIData* data = new CGIData;
data->name = name;
data->host = user->host;
data->ip = user->GetIPString();
cmd.cgiext.set(user,data);
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(const std::string& name, 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);
CGIData* data = new CGIData;
data->name = name;
data->host = user->host;
data->ip = user->GetIPString();
cmd.cgiext.set(user,data);
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)
