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Top Forums Shell Programming and Scripting Setuid not working in Linux as script fails to write to file. Post 302826077 by waavman on Wednesday 26th of June 2013 12:48:33 AM
Old 06-26-2013
I didnot know that setuid is not supported by Linux.
But I noticed that the /usr/bin/passwd binary has setuid set on Linux. Similarly ping program also has setuid bit set on Linux.
How is that possible if Linux doesnot support setuid. ALso how will the passwd command write to /etc/shadow if setuid is not supported on Linux. Also how come I saw the rwsr-xr-x permission on the /usr/bin/passwd executable ?
Please throw some light.

thanks

---------- Post updated at 12:48 AM ---------- Previous update was at 12:36 AM ----------

My objective is for an environment file which has database passwords in it NOT to be readable by the anybody logging as the application user but at the same time the script which uses these passwords must be able to execute some script and read these passwords and use the passwords for running its internal database sqls'. I was thinking of making the environment file owner as root with no read permission to the application userid so that nobody can view the passwords and then use setuid bit on the support script which when called by the main script is able to fetch these passwords as it runs as root user. But since setuid is not supported by Linux I will not be able to make the password file non-readable owned by root and be able to execute some setuid script that can fetch the passwords from this root owned password file.
Any suggestions on an alternative way to achieve this would be highly welcome ?

thanks
 

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SHUNIT2(1)																SHUNIT2(1)

NAME
shunit2 - A unit test framework for shell scripts SYNOPSIS
shunit2 unitfile DESCRIPTION
shUnit2 is a xUnit unit test framework for Bourne based shell scripts, and it is designed to work in a similar manner to JUnit, PyUnit, etc.. If you have ever had the desire to write a unit test for a shell script, shUnit2 can do the job. You can either run shunit2 directly from the commandline and specify the unit file or directly source the shunit2 executable. If you directly execute shunit2 and don't specify a unitfile shunit2 assumes a empty testfile and will return without an error message. EXAMPLE
Simple script to test if 1 equals 1 #! /bin/sh testEquality() { assertEquals 1 1 } # load shunit2 . shunit2 Execute shUnit2 unit tests directly from the commandline shunit2 /path/to/unit/file OPTIONS
shunit2 does not support any commandline options at all. You can either source shunit2 to execute your unit tests or directly run shunit2 as a commandline script. SEE ALSO
For more information see http://code.google.com/p/shunit2/ or have a look at the installed documentation in /usr/share/doc/shunit2/ AUTHOR
shunit2 was written by Kate Ward <kate.ward@forestent.com>. This manpage was written by Ulrich Dangel <mru@spamt.net>. 2.1.6 03/25/2012 SHUNIT2(1)
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