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Restrict access to .ksh scripts


 
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# 1  
Old 01-22-2012
Restrict access to .ksh scripts

Hi,
How to restrict access to a .ksh script in such the way that the users can only execute the script, neither read nor write.

I tried the below code so that my user alone has the rwx and other users can only execute.

Code:
chmod 711 sample.ksh

But when I logged in as a different user and tried to execute the script, I get an error "Permission Denied".

How should I give the rights to the script to achive what I want?
# 2  
Old 01-22-2012
What you want is not possible using permissions. To execute a script users need both r and x rights.. To take away only w rights, use chmod 755.
# 3  
Old 01-22-2012
I don't think without read permission, execution is possible. Have you looked into sudoers?

--ahamed
# 4  
Old 01-22-2012
Yes, without read it is not possible. Is there any workaround for this?
# 5  
Old 01-22-2012
Like ahamed101 suggests you can use sudo definitions, so that users are denied access, but are given permission to execute the script as a different functional user if they belong to a certain group ...
# 6  
Old 01-22-2012
Actually, it is possible to have a non readable script to be executable. This is done by setting the setuid bit on the script file. The script should not be owned by root for obvious security reasons.
Code:
$ cat script.ksh
#!/bin/ksh
echo this is $0
id
$ chmod 04711 script.ksh

Then, logged in as a different user:
Code:
$ id
uid=102(guest) gid=1(other)
$ cat script.ksh
cat: script.ksh: cannot open [Permission denied]
$ ls -l script.ksh
-rws--x--x   1 jlliagre jlliagre      30 Jan 22 14:46 script.ksh
$ ./script.ksh
this is script.ksh
uid=102(guest) gid=1(other) euid=12345 (jlliagre)

As you can see, the script will run under its owner account as effective user id, not the user who launches it . This might be a problem.
This User Gave Thanks to jlliagre For This Post:
# 7  
Old 01-22-2012
Another option (maybe not acceptable )is to render the the shell script unreadable by making it an executable image (with encrypted strings). Since you apparently have passwords or other very sensitive information in the shell scripts this is possibly a better idea.

Francisco Rosales, home page generic version, you have to edit the makefile for your OS
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