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Setting a Secure umask in bash
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Setting a Secure umask in bash

InfinityCoder February 21, 2017

You want to make sure you are using a secure umask.

Use the bash built-in umask to set a known good state at the beginning of every script:

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# Set a sane/secure umask variable and use it
# Note this does not affect files already redirected on the command line
# 002 results in 0774 perms, 077 results in 0700 perms, etc...
UMASK=002
umask $UMASK

We set the $UMASK variable in case we need to use different masks elsewhere in the program.

You could just as easily do without it; it’s not a big deal.

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# Run a new shell so you don't affect your current
environment
/tmp$ bash
 
# Check the current settings
/tmp$ touch um_current
 
# Check some other settings
/tmp$ umask 000 ; touch um_000
/tmp$ umask 022 ; touch um_022
 
/tmp$ umask 077 ; touch um_077
 
/tmp$ ls -l um_*
-rw-rw-rw- 1 jp jp 0 Jul 22 06:05 um000
-rw-r--r-- 1 jp jp 0 Jul 22 06:05 um022
-rw------- 1 jp jp 0 Jul 22 06:05 um077
-rw-rw-r-- 1 jp jp 0 Jul 22 06:05 umcurrent
 
# Clean up and exit the sub-shell
/tmp$ rm um_*
/tmp$ exit

 

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