Use limited Shell - rbash2011/05/09 |
| Add a user who can execute some specific commands.
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| [1] | Create a link named 'rbash' from bash. |
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[root@dlp ~]# ln -s /bin/bash /opt/rbash
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| [2] | Add a user that his default shell is rbash and set he can execute only 'ping'. |
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[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=$HOME/bin |
| [3] | Login with a user. |
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[cern@dlp ~]$ -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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