Provided by: libpam-modules_1.1.8-3.6ubuntu2.18.04.6_amd64 
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:
• umask= argument
• umask= entry in the user's GECOS field
• UMASK= entry from /etc/default/login
• UMASK entry from /etc/login.defs (influenced by USERGROUPS_ENAB in /etc/login.defs)
The GECOS field is split on comma ',' characters. The module also in addition to the umask= entry
recognizes pri= entry, which sets the nice priority value for the session, and ulimit= entry, which sets
the maximum size of files the processes in the session can create.
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). Note that using this option
explicitly is discouraged. pam_umask enables this functionality by default if /etc/login.defs enables
USERGROUPS_ENAB, and the umask is not set explicitly in other places than /etc/login.defs (this is
compatible with login's behaviour without PAM).
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>.