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= entry in the user's GECOS field
umask= argument
UMASK entry from /etc/login.defs
UMASK= entry from /etc/default/login
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.
Add the following line to /etc/pam.d/login to
set the user specific umask at login:
session optional pam_umask.so umask=0022