[CentOS] rsh issue/update (access denied)...

bruce bedouglas at earthlink.net
Tue Jun 24 14:49:53 UTC 2008


hi...

i've got an "access denied" issue with rsh on one of my boxes (and before we
start, no "use ssh" comments.. rsh is what i'm dealing with for now!!)

i've got a few boxes in my network, and i can successfully rsh into them
with no issue. however, on one box, i can't access it using rsh, and i'm
running out of things to try... kind of curious.

i can login using rlogin.

i've modifed the /etc/pam.d/rsh,rlogin files, along with the /etc/securetty
file. i've also changed the /etc/xinetd.d/(rsh,rlogin)files. as far as i can
tell, nothing else has been changed...

the curious thing. as far as i can tell... the files on the system that
doesn't work, are the same as the files on the systems that are allowing rsh
to occur...

the err i'm getting in the /var/log/secure is:
Jun 23 22:16:09 lserver5 userhelper[2186]:
pam_timestamp(system-config-services:session): updated timestamp file
`/var/run/sudo/root/unknown'
Jun 23 22:16:09 lserver5 userhelper[2189]: running
'/usr/sbin/system-config-services' with root privileges on behalf of 'root'
Jun 23 22:16:28 lserver5 xinetd[2227]: START: shell pid=2239
from=192.168.1.45
Jun 23 22:16:28 lserver5 rshd[2239]: pam_rhosts_auth(rsh:auth): denied to
root at 192.168.1.45 as test1: access not allowed
Jun 23 22:16:28 lserver5 rshd[2239]: pam_unix(rsh:session): session opened
for user test1 by (uid=0)
Jun 23 22:16:28 lserver5 rshd[2239]: pam_unix(rsh:session): session closed
for user test1


etc/pam.d/rsh
#%PAM-1.0
# For root login to succeed here with pam_securetty, "rsh" must be
# listed in /etc/securetty.
auth       required     pam_nologin.so
auth       sufficient      pam_rhosts_auth.so promiscuous
auth       required             pam_securetty.so
auth       required             pam_env.so
account    include      system-auth
session    include      system-auth

etc/pam.d/rlogin
#%PAM-1.0
# For root login to succeed here with pam_securetty, "rlogin" must be
# listed in /etc/securetty.
auth       required     pam_nologin.so
auth       sufficient   pam_rhosts_auth.so      promiscuous
auth       required     pam_securetty.so
auth       required     pam_env.so
auth       include      system-auth
account    include      system-auth
password   include      system-auth
session    include      system-auth

/etc/securetty
rsh
rlogin
rlogind
rexec
console
vc/1
vc/2
vc/3
vc/4
vc/5
.
.
.


/etc/xinetd.d/rexec::
# description: Rexecd is the server for the rexec(3) routine.  The server \
#       provides remote execution facilities with authentication based \
#       on user names and passwords.
service exec
{
        socket_type          = stream
        wait            = no
        user            = root
        log_on_success    += USERID
        log_on_failure   += USERID
        server      = /usr/sbin/in.rexecd
        disable                 = no
}


/etc/xinetd.d/rsh::
# default: on
# description: The rshd server is the server for the rcmd(3) routine and, \
#       consequently, for the rsh(1) program.  The server provides \
#       remote execution facilities with authentication based on \
#       privileged port numbers from trusted hosts.
service shell
{
        disable = no
        socket_type          = stream
        wait            = no
        user            = root
        log_on_success    += USERID
        log_on_failure   += USERID
        server      = /usr/sbin/in.rshd
}


/etc/xinetd.d/rlogin::
# default: on
# description: rlogind is the server for the rlogin(1) program.  The server
\
#       provides a remote login facility with authentication based on \
#       privileged port numbers from trusted hosts.
service login
{
        socket_type          = stream
        wait            = no
        user            = root
        log_on_success    += USERID
        log_on_failure   += USERID
        server      = /usr/sbin/in.rlogind
        disable   = no
}


i've been searching across the net for the last day or so, so i suspect that
the solution is staring at me and i'm missing it!

is there a way to debug this from the server side? is there a way to turn
off authentication.. Is there a way to turn off/disable securetty...

so... any thoughts/comments/things to check would be greatly appreciated....


thanks






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