12-09-2015
Notice, that the UMASK is the inverted number the file mode is set to.
That is: the normal file rights are three sets of digits 0-7. UMASK now is what you take away from "777" to arrive at the result. If your UMASK is (hypothetically) "777" that will result in a file with mode "000". If you set the UMASK to "037" that will set the file mode to "640" (the "7" would be the x-bit set which is not done automatically, therefore 6 and not 7 in the first digit).
Note also, that directory rights work a bit different than file rights. For a newly created directory you may want to have the x-bit set (otherwise you can't change into it, regardless of having read-rights or not) and therefore there is a difference between UMASK 037 and UMASK 027, like MadeInGermany suggested.
I hope this helps.
bakunin
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LEARN ABOUT DEBIAN
pam_umask
PAM_UMASK(8) Linux-PAM Manual PAM_UMASK(8)
NAME
pam_umask - PAM module to set the file mode creation mask
SYNOPSIS
pam_umask.so [debug] [silent] [usergroups] [umask=mask]
DESCRIPTION
pam_umask is a PAM module to set the file mode creation mask of the current environment. The umask affects the default permissions assigned
to newly created files.
The PAM module tries to get the umask value from the following places in the following order:
o umask= argument
o umask= entry of the users GECOS field
o pri= entry of the users GECOS field
o ulimit= entry of the users GECOS field
o UMASK= entry from /etc/default/login
o UMASK entry from /etc/login.defs
OPTIONS
debug
Print debug information.
silent
Don't print informative messages.
usergroups
If the user is not root and the username is the same as primary group name, the umask group bits are set to be the same as owner bits
(examples: 022 -> 002, 077 -> 007).
umask=mask
Sets the calling process's file mode creation mask (umask) to mask & 0777. The value is interpreted as Octal.
MODULE TYPES PROVIDED
Only the session type is provided.
RETURN VALUES
PAM_SUCCESS
The new umask was set successfully.
PAM_SERVICE_ERR
No username was given.
PAM_USER_UNKNOWN
User not known.
EXAMPLES
Add the following line to /etc/pam.d/login to set the user specific umask at login:
session optional pam_umask.so umask=0022
SEE ALSO
pam.conf(5), pam.d(5), pam(7)
AUTHOR
pam_umask was written by Thorsten Kukuk <kukuk@thkukuk.de>.
Linux-PAM Manual 06/04/2011 PAM_UMASK(8)