02-08-2010
Configuring Linux as a firewall
i have a linux server runnig oracle applications.
i need to access this server from putty using ssh through internet.
i did by registering my static ip with the dnydns.org and i am able to connect to the server.
but now there is no security to authenticate any user as any one knowing the password can login to it.
i thought of configuring the firewall of linux server but the client ip`s are not static and they change continiously.
so thought of keeping one more pc between the server and the router which will do the work of authenticating. but i am confuse as how to configure it to allow the packets coming from the internet after authenticating and to by pass the packets generated from internal LAN?
i have heared abut freeradius package but i am not sure will it work in my case?
thanx in advance
Last edited by u.n.i.x; 02-08-2010 at 06:37 AM..
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NWAUTH(1) nwauth NWAUTH(1)
NAME
nwauth - Verify username/password
SYNOPSIS
nwauth [ -h ] [ -S server ] [ -U user name ] [ -P password | -n ] [ -D ]
DESCRIPTION
nwauth does nothing but logging into a NetWare server. If the login was successful, an error code of 0 is returned. If the login was not
successful, an error code of 1 is returned. It was designed for use by other programs who want authenticate users via a NetWare server.
If there is no -P or -n option specified on command line, nwauth always expects a password on stdin. If the stdin is a tty, then the user
is prompted for a password. Otherwise nwauth simply reads stdin for a password.
nwauth looks up the file $HOME/.nwclient to find a file server and a user name if they are not specified on command line. See nwclient(5)
for more information. Please note that the access permissions of .nwclient MUST be 600, for security reasons.
OPTIONS
-h
-h is used to print a short help text.
-S server
server is the name of the server you want to use.
-U user name
If the user name your NetWare administrator gave to you differs from your unix user-id, you should use -U to tell the server about your
NetWare user name.
-D
nwauth says that your password is correct if you have existing connection to server with name user name. This is handy for some shell
scripts, but it is unacceptable for authorization modules, such as PAM, PHP or Apache. It was pointed to me that this behavior was not
well known, and there exist at least one PAM module which does not know that (this module is not part of ncpfs; you should use PAM mod-
ule which comes with ncpfs instead anyway).
SEE ALSO
nwclient(5)
CREDITS
nwauth was written by Volker Lendecke (lendecke@math.uni-goettingen.de)
nwauth 10/27/1996 NWAUTH(1)