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#!/bin/sh # It receives as arguments: # - $1 polydir path (see WARNING below) # - $2 instance path (see WARNING below) # - $3 flag whether the instance dir was newly created (0 - no, 1 - yes) # - $4 user name # - $5 flag whether the polydir path ($1) is safe (0 - unsafe, 1 -safe) # - $6 flag whether the instance path ($2) is safe (0 - unsafe, 1 - safe) # # WARNING: This script is invoked with full root privileges. Accessing # the polydir ($1) and the instance ($2) directories in this context may be # extremely dangerous as those can be under user control. The flags $5 and $6 # are provided to let you know if all the segments part of the path (except the # last one) are owned by root and are writable by root only. If the path does # not meet these criteria, you expose yourself to possible symlink attacks when # accessing these path. # However, even if the path components are safe, the content of the # directories may still be owned/writable by a user, so care must be taken! # # The following section will copy the contents of /etc/skel if this is a # newly created home directory. # Executes only if the polydir path is safe if [ "$5" = 1 ]; then 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=$(sed -E -n 's/^UMASK[[:space:]]+([^#[:space:]]+).*/\1/p' /etc/login.defs) mode=$(printf "%o" $((0777 & ~mask))) chmod ${mode:-700} "$homedir" [ -x /sbin/restorecon ] && /sbin/restorecon -R "$homedir" fi fi fi exit 0