On Mon, 3 Dec 2007, Anjang Aki wrote:
hi!.. i'm not able to change file permission to disable rlogin and login on
my box even as root
# ls -lo /usr/bin/login /usr/bin/rlogin
-r-sr-xr-x 1 root wheel schg 19996 Dec 1 13:04 /usr/bin/login
-r-sr-xr-x 1 root wheel schg 10140 Dec 1 13:04 /usr/bin/rlogin
# chflags -R nouchg login rlogin
chflags: /usr/bin/login: Operation not permitted
chflags: /usr/bin/rlogin: Operation not permitted
# chmod a=rx /usr/bin/login /usr/bin/rlogin
chmod: /usr/bin/login: Operation not permitted
chmod: /usr/bin/rlogin: Operation not permitted
it makes me uneasy as my users can still use login and rlogin to gain access
to the box
Others have already addressed the chflags issue, but there's a larger concern
here.
First off, 'rlogin' is the client, not the server for the rlogin protocol, so
chmodding the file limits the ability to rlogin *from* your system, not rlogin
*to* your system. The ability to login via rlogin is controlled via
inetd.conf, which enables or disables the rlogind daemon. By default we
neither run inetd nor rlogind, and even if you enable inetd, you still need to
also enable rlogind explicitly. Probably for the reasons you have in mind.
Second, I'm not sure what you're trying to do by disabling 'login', but keep
in mind that 'login' is used on the console to allow login to the system on
the console, so you may lock yourself out of the console if you disable it.
On the other hand, 'login' is *not* used for sshd, so if your goal is to deny
network access, it won't have that effect.
In general, what you want to do to prevent login over the network is not
enable network services that allow remote login -- sshd, telnetd, rlogind,
ftpd, etc. By default, we disable all those services. You can look in a
combination of /etc/rc.conf and /etc/inetd.conf to see what is enabled.
Robert N M Watson
Computer Laboratory
University of Cambridge
my system:
# uname -a
FreeBSD k3.college.edu 6.3-PRERELEASE FreeBSD 6.3-PRERELEASE #1: Sun
Dec 2 18:51:02 MYT 2007 [EMAIL PROTECTED]:/usr/obj/usr/src/sys/EDU
i386
thanks for advice
--
-- Anjang Aki --
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
