pam_umask — PAM module to set the file mode creation mask

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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= entry in the user's GECOS field (see below for details)

  • umask= argument

  • UMASK entry from /etc/login.defs (influenced by USERGROUPS_ENAB in /etc/
    login.defs)

  • UMASK= entry from /etc/default/login

The GECOS field is split on comma ',' characters. Entries must be set in its
'other' (sub-)field (the 5th field within the GECOS field), which could be
done, for example, using chfn --other. In addition to the umask= entry, the
module also recognizes the pri= entry, which sets the nice priority value for
the session, and the 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).

nousergroups

    This is the direct opposite of the usergroups option described above, which
    can be useful in case pam_umask has been compiled with usergroups enabled
    by default and you want to disable it at runtime.

umask=mask

    Sets the calling process's file mode creation mask (umask) to mask & 0777.
    The value is interpreted as Octal.

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


AUTHOR

pam_umask was written by Thorsten Kukuk <kukuk@thkukuk.de>.

