shadow/man/login.defs.d/UMASK.xml
Duncan Overbruck a847899b52
add new HOME_MODE login.defs(5) option
This option can be used to set a separate mode for useradd(8) and
newusers(8) to create the home directories with.
If this option is not set, the current behavior of using UMASK
or the default umask is preserved.

There are many distributions that set UMASK to 077 by default just
to create home directories not readable by others and use things like
/etc/profile, bashrc or sudo configuration files to set a less
restrictive
umask. This has always resulted in bug reports because it is hard
to follow as users tend to change files like bashrc and are not about
setting the umask to counteract the umask set in /etc/login.defs.

A recent change in sudo has also resulted in many bug reports about
this. sudo now tries to respect the umask set by pam modules and on
systems where pam does not set a umask, the login.defs UMASK value is
used.
2020-01-11 22:27:39 +01:00

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<varlistentry>
<term><option>UMASK</option> (number)</term>
<listitem>
<para>
The file mode creation mask is initialized to this value. If not
specified, the mask will be initialized to 022.
</para>
<para>
<command>useradd</command> and <command>newusers</command> use this
mask to set the mode of the home directory they create if
<option>HOME_MODE</option> is not set.
</para>
<para condition="no_pam">
It is also used by <command>login</command> to define users' initial
umask. Note that this mask can be overridden by the user's GECOS
line (if <option>QUOTAS_ENAB</option> is set) or by the
specification of a limit with the <emphasis>K</emphasis> identifier
in <citerefentry><refentrytitle>limits</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>.
</para>
<para condition="pam">
It is also used by <command>pam_umask</command> as the default umask
value.
</para>
</listitem>
</varlistentry>