CentOS 6
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Use limited Shell - rbash
2011/07/11
 
Add a user who can execute some specific commands.
[1] Create a link named 'rbash' from bash.
[root@dlp ~]#
ln -s /bin/bash /opt/rbash
[2] Add a user that his default shell is rbash and set he can execute only 'ping'.
[root@dlp ~]#
useradd cern -s /opt/rbash

[root@dlp ~]#
passwd cern

[root@dlp ~]#
mkdir /home/cern/bin

[root@dlp ~]#
ln -s /bin/ping /home/cern/bin/ping

[root@dlp ~]#
chown root. /home/cern/.bash_profile

[root@dlp ~]#
chmod 755 /home/cern/.bash_profile

[root@dlp ~]#
vi /home/cern/.bash_profile
# change PATH like follows

PATH=
$HOME/bin

[3] Login with the test user.
[cern@dlp ~]$
-rbash: cd: restricted
# denied

[cern@dlp ~]$
-rbash: ls: command not found
# none

[cern@dlp ~]$
ping localhost

PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.045 ms
64 bytes from localhost (127.0.0.1): icmp_seq=2 ttl=64 time=0.008 ms
64 bytes from localhost (127.0.0.1): icmp_seq=3 ttl=64 time=0.008 ms
--- localhost ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2157ms
rtt min/avg/max/mdev = 0.008/0.020/0.045/0.017 ms  
# executed
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