/etc/security/namespace.init is in libpam-modules 1.1.3-7ubuntu2.3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #!/bin/sh -p
# It receives polydir path as $1, the instance path as $2,
# a flag whether the instance dir was newly created (0 - no, 1 - yes) in $3,
# and user name in $4.
#
# The following section will copy the contents of /etc/skel if this is a
# newly created home directory.
if [ "$3" = 1 ]; then
# This line will fix the labeling on all newly created directories
[ -x /sbin/restorecon ] && /sbin/restorecon "$1"
user="$4"
passwd=$(getent passwd "$user")
homedir=$(echo "$passwd" | cut -f6 -d":")
if [ "$1" = "$homedir" ]; then
gid=$(echo "$passwd" | cut -f4 -d":")
cp -rT /etc/skel "$homedir"
chown -R "$user":"$gid" "$homedir"
mask=$(awk '/^UMASK/{gsub("#.*$", "", $2); print $2; exit}' /etc/login.defs)
mode=$(printf "%o" $((0777 & ~$mask)))
chmod ${mode:-700} "$homedir"
[ -x /sbin/restorecon ] && /sbin/restorecon -R "$homedir"
fi
fi
exit 0
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