How to Set System Wide Umask

How to set system wide umask?

Both Debian and Ubuntu ship with pam_umask. This allows you to configure umask in /etc/login.defs and have them apply system-wide, regardless of how a user logs in.

To enable it, you may need to add a line to /etc/pam.d/common-session reading

session optional pam_umask.so

or it may already be enabled. Then edit /etc/login.defs and change the UMASK line to

UMASK           002

(the default is 022).

Note that users may still override umask in their own ~/.profile or ~/.bashrc or similar, but (at least on new Debian and Ubuntu installations) there shouldn't be any overriding of umask in /etc/profile or /etc/bash.bashrc. (If there are, just remove them.)

How can I set default umask in gnome on Debian-Stretch?

Gnome applications in question are likely launched by systemd user instance, which sets the umask to 022 regardless the umask configured using PAM.

This question has also been asked on U&L SE and has more answers there.

Set UMASK value only for non root users

You could just put umask 022 in your root's .profile/.bashrc and have 077 as a default in your /etc/login.defs.

The umask shell builtin makes the umask system call which sets process-inheritable the umask property: a umask call set in one process affects all descendants of that process (unless they themselves make a umask call), so to set a umask for "user", you need to call umask in a process from which all user processes descend (the login shell and/or the shell through which sudo commands are invoked).

Setting the umask of the Apache user

Apache inherits its umask from its parent process (i.e. the process starting Apache); this should typically be the /etc/init.d/ script. So put a umask command in that script.

How to set umask for www-data user?

I hope this will work, Please try this way

Manually edit /etc/systemd/system/multi-user.target.wants/ php7.0-fpm.service file and add UMask=0002 line inside [Service] section.

Previously, it was like this.

then

Run command systemctl daemon-reload

then

Run command systemctl restart php7.0-fpm.service

Now the service file looks like this:

[Unit]
Description = The PHP FastCGI Process Manager
After = network.target

[Service]
Type = notify
PIDFile = /var/run/php/php7.0-fpm.pid 
ExecStartPre = /usr/lib/php/php7.0-fpm-checkconf
ExecStart = /usr/sbin/php-fpm7.0 --nodaemonize --fpm-config /etc/php/7.0/fpm/php-fpm.conf
ExecReload = /bin/kill -USR2 $MAINPID
; Added to set umask for files created by PHP
UMask = 0002

[Install]
WantedBy = multi-user.target

NB : You can not use systemctl edit php7.0-fpm.service command as edit option was introduced in systemctl version 218 but Debian 8 ships with version 215.

set umask for tomcat8 via tomcat.service

Try adding UMASK as Environment variable into tomcat's service file:

[Service]
...
Environment='UMASK=0022'
...

Default catalina.sh is checking for environment's $UMASK:

# Set UMASK unless it has been overridden
 if [ -z "$UMASK" ]; then
  UMASK="0027"
 fi
 umask $UMASK

(It seems to me, that UMask from systemd is not used by Tomcat, but I am not completely sure.)

Linux file default permissions

For changing default permissions of the file created, you can use umask command. umask is user mask which is used whenever a new file is created.

umask is a three digit number with octal base. First digit decides the user permissions, second is for group while third determines the permissions for others.

umask value is used in inverted/complemented form though. That means to determine the required umask value for the permissions you want, subtract the permissions (in octal form) from 666. The result should be used as your umask value. e.g. if you want to set default permissions to rw-r--r-- (which is 644 in octal) subtract 644 from 666. The result (022) is your umask value.

To set value for umask you can simply use:

umask 022

command.

For your case here, I think you can use

umask 000

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