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/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2007 InspIRCd Development Team
* See: http://www.inspircd.org/wiki/index.php/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
#include "users.h"
#include "modules.h"
#include "dns.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 { 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 &password ="")
: hostmask(mask), type(t), password(password)
{
}
};
typedef std::vector<CGIhost> CGIHostlist;
class cmd_webirc : public command_t
{
InspIRCd* Me;
CGIHostlist Hosts;
bool notify;
public:
cmd_webirc(InspIRCd* Me, CGIHostlist &Hosts, bool notify) : command_t(Me, "WEBIRC", 0, 4, true), Hosts(Hosts), notify(notify)
{
this->source = "m_cgiirc.so";
this->syntax = "password client hostname ip";
}
CmdResult Handle(const char** parameters, int pcnt, userrec *user)
{
if(user->registered == REG_ALL)
return CMD_FAILURE;
for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
{
if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
{
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->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick, user->host, parameters[2], user->host);
user->Extend("cgiirc_webirc_hostname", new std::string(parameters[2]));
user->Extend("cgiirc_webirc_ip", new std::string(parameters[3]));
return CMD_LOCALONLY;
}
}
}
return CMD_FAILURE;
}
};
/** Resolver for CGI:IRC hostnames encoded in ident/GECOS
*/
class CGIResolver : public Resolver
{
std::string typ;
int theirfd;
userrec* them;
bool notify;
public:
CGIResolver(Module* me, InspIRCd* ServerInstance, bool NotifyOpers, const std::string &source, bool forward, userrec* u, int userfd, const std::string &type, bool &cached)
: Resolver(ServerInstance, 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->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", them->nick, them->host, result.c_str(), typ.c_str());
strlcpy(them->host, result.c_str(), 63);
strlcpy(them->dhost, result.c_str(), 63);
strlcpy(them->ident, "~cgiirc", 8);
them->InvalidateCache();
}
}
virtual void OnError(ResolverError e, const std::string &errormessage)
{
if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
{
if (notify)
ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but their host can't be resolved from their %s!", them->nick, them->host,typ.c_str());
}
}
virtual ~CGIResolver()
{
}
};
class ModuleCgiIRC : public Module
{
cmd_webirc* mycommand;
bool NotifyOpers;
CGIHostlist Hosts;
public:
ModuleCgiIRC(InspIRCd* Me) : Module(Me)
{
OnRehash(NULL,"");
mycommand=new cmd_webirc(Me, Hosts, NotifyOpers);
ServerInstance->AddCommand(mycommand);
}
void Implements(char* List)
{
List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = List[I_OnUserConnect] = 1;
}
virtual Priority Prioritize()
{
// We want to get here before m_cloaking and m_hostchange etc
return PRIORITY_FIRST;
}
virtual void OnRehash(userrec* user, const std::string ¶meter)
{
ConfigReader Conf(ServerInstance);
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->Log(DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
} else {
CGItype cgitype;
if(type == "pass")
cgitype = PASS;
else if(type == "ident")
cgitype = IDENT;
else if(type == "passfirst")
cgitype = PASSFIRST;
else if(type == "webirc") {
cgitype = WEBIRC;
}
Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
}
}
else
{
ServerInstance->Log(DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
continue;
}
}
}
virtual void OnCleanup(int target_type, void* item)
{
if(target_type == TYPE_USER)
{
userrec* user = (userrec*)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(userrec* 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)
{
userrec* dest = (userrec*)target;
std::string* bleh;
if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
{
dest->Extend(extname, new std::string(extdata));
}
}
}
virtual void OnUserQuit(userrec* user, const std::string &message, const std::string &oper_message)
{
OnCleanup(TYPE_USER, user);
}
virtual int OnUserRegister(userrec* user)
{
for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
{
if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
{
// Deal with it...
if(iter->type == PASS)
{
CheckPass(user); // We do nothing if it fails so...
}
else if(iter->type == PASSFIRST && !CheckPass(user))
{
// If the password lookup failed, try the ident
CheckIdent(user); // If this fails too, do nothing
}
else if(iter->type == IDENT)
{
CheckIdent(user); // Nothing on failure.
}
else if(iter->type == IDENTFIRST && !CheckIdent(user))
{
// If the ident lookup fails, try the password.
CheckPass(user);
}
else if(iter->type == WEBIRC)
{
// We don't need to do anything here
}
return 0;
}
}
return 0;
}
virtual void OnUserConnect(userrec* user)
{
std::string *webirc_hostname, *webirc_ip;
if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
{
strlcpy(user->host,webirc_hostname->c_str(),63);
strlcpy(user->dhost,webirc_hostname->c_str(),63);
delete webirc_hostname;
user->InvalidateCache();
user->Shrink("cgiirc_webirc_hostname");
}
if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
{
bool valid=false;
user->RemoveCloneCounts();
#ifdef IPV6
valid = (inet_pton(AF_INET6, webirc_ip->c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
if(!valid)
valid = (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr));
#else
if (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr))
valid = true;
#endif
delete webirc_ip;
user->InvalidateCache();
user->Shrink("cgiirc_webirc_ip");
ServerInstance->AddLocalClone(user);
ServerInstance->AddGlobalClone(user);
user->CheckClass();
}
}
bool CheckPass(userrec* user)
{
if(IsValidHost(user->password))
{
user->Extend("cgiirc_realhost", new std::string(user->host));
user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
strlcpy(user->host, user->password, 64);
strlcpy(user->dhost, user->password, 64);
user->InvalidateCache();
bool valid = false;
user->RemoveCloneCounts();
#ifdef IPV6
if (user->GetProtocolFamily() == AF_INET6)
valid = (inet_pton(AF_INET6, user->password, &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
else
valid = (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr));
#else
if (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr))
valid = true;
#endif
ServerInstance->AddLocalClone(user);
ServerInstance->AddGlobalClone(user);
user->CheckClass();
if (valid)
{
/* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
if(NotifyOpers)
ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
}
else
{
/* We got as resolved hostname in the password. */
try
{
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->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
}
}
*user->password = 0;
/*if(NotifyOpers)
ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
return true;
}
return false;
}
bool CheckIdent(userrec* user)
{
int ip[4];
char* ident;
char newip[16];
int len = strlen(user->ident);
if(len == 8)
ident = user->ident;
else if(len == 9 && *user->ident == '~')
ident = user->ident+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()));
user->RemoveCloneCounts();
#ifdef IPV6
if (user->GetProtocolFamily() == AF_INET6)
inet_pton(AF_INET6, newip, &((sockaddr_in6*)user->ip)->sin6_addr);
else
#endif
inet_aton(newip, &((sockaddr_in*)user->ip)->sin_addr);
ServerInstance->AddLocalClone(user);
ServerInstance->AddGlobalClone(user);
user->CheckClass();
try
{
strlcpy(user->host, newip, 16);
strlcpy(user->dhost, newip, 16);
strlcpy(user->ident, "~cgiirc", 8);
bool cached;
CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
ServerInstance->AddResolver(r, cached);
}
catch (...)
{
strlcpy(user->host, newip, 16);
strlcpy(user->dhost, newip, 16);
strlcpy(user->ident, "~cgiirc", 8);
user->InvalidateCache();
if(NotifyOpers)
ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
}
/*strlcpy(user->host, newip, 16);
strlcpy(user->dhost, newip, 16);
strlcpy(user->ident, "~cgiirc", 8);*/
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(1,1,0,0,VF_VENDOR,API_VERSION);
}
};
MODULE_INIT(ModuleCgiIRC)
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