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Re: Can't run whoami(id -un) inside chroot jail using openssh native jai

from [Vladimir Levijev] Network Security [Permanent Link]
Subject: Re: Can't run whoami(id -un) inside chroot jail using openssh native jail support
Date: Thu, 24 Jul 2008 22:41:04 +0300 
2008/7/23, D M <dm.mlist@gmail.com>:


OS: RHEL5.2
 Openssh: 5.0p1 and now 5.1

 I have successfully setup a chroot jail using openssh's new native
 jail support and almost everything appears to be working
 (ls,cd,cat,uname,etc,ect). However I can't run any commands that
 identify the user.. such as ld -un whoami logname. They all fail with
 this result:

 #whoami
 whoami: cannot find name for user ID 503
 #id
 uid=503 gid=504 groups=504
 #id -un
 id: cannot find name for user ID 503
 503
 #logname
 503

 i've made sure that /etc/passwd and even /etc/group are in the jail
 with the proper permissions but still I get the same result.. Any
 suggestions??


I wonder if you are missing NSS (/etc/nsswitch.conf) in your jailed
system? I would also check it with strace, like:

strace id -un

Although that would probably require setting up strace which might be
too expensive to set up in a jailed system.

Cheers,

VL

Regards,

VL
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