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I've develop an interactive shell script, where my users will perform a few operations. I've create a user that runs this scripts automatically on startup.

Startup script ./.bash_login
-------------------------------
/scripts/interactive_shell.py
exit

This script performs correctly my interest, it runs my python interactive script, and when I kill my script, it runs exit and finish my connection.

The security problem appears when I'm connecting using my private key with something like this

ssh user@host.com -i security_key '/bin/bash'

It runs bash shell and I can get something I don't want control over the machine.

My question is, is it possible to change the shell at /etc/passwd to my script or It's preferable to jailroot this user?

Thanks!

  • You know you can tie a particular command to the key by editing the entry in the authorized_keys file ... command="/scripts/interactive_shell.py" ssh-rsa AAAAB3NzaC1yc... – user9517 May 8 '13 at 11:18
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I've tried to change the /etc/passwd file to something like this

sec_user1:x:1001:1001:Secure User 1:/home/sec_user1:/scripts/interactive_shell.py

It works! and if you try to execute some kind of code I'll get this:

option -c not recognized

Usage: console.py [OPTION] [PATHS]
    --name=value    whatever
    --help          display help

I soupose this is 100% secure, but it's you cannot run commands easilly.

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I would check out rssh (the restricted shell).

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  • Please explain why you suggest rssh – weeheavy May 8 '13 at 11:51

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