#!/bin/bash

## Copyright (C) 2012 - 2024 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## See the file COPYING for copying conditions.

## Doing this for all users would create many issues.
# /usr/libexec/security-misc/permission-lockdown: user: root | chmod o-rwx "/root"
# /usr/libexec/security-misc/permission-lockdown: user: daemon | chmod o-rwx "/usr/sbin"
# /usr/libexec/security-misc/permission-lockdown: user: bin | chmod o-rwx "/bin"
# /usr/libexec/security-misc/permission-lockdown: user: sys | chmod o-rwx "/dev"
# /usr/libexec/security-misc/permission-lockdown: user: sync | chmod o-rwx "/bin"
# /usr/libexec/security-misc/permission-lockdown: user: games | chmod o-rwx "/usr/games"
# /usr/libexec/security-misc/permission-lockdown: user: man | chmod o-rwx "/var/cache/man"
# /usr/libexec/security-misc/permission-lockdown: user: mail | chmod o-rwx "/var/mail"
# /usr/libexec/security-misc/permission-lockdown: user: proxy | chmod o-rwx "/bin"
# /usr/libexec/security-misc/permission-lockdown: user: backup | chmod o-rwx "/var/backups"
# /usr/libexec/security-misc/permission-lockdown: user: systemd-timesync | chmod o-rwx "/run/systemd"
# /usr/libexec/security-misc/permission-lockdown: user: systemd-network | chmod o-rwx "/run/systemd/netif"
# /usr/libexec/security-misc/permission-lockdown: user: messagebus | chmod o-rwx "/var/run/dbus"
# /usr/libexec/security-misc/permission-lockdown: user: tinyproxy | chmod o-rwx "/run/tinyproxy"
# /usr/libexec/security-misc/permission-lockdown: user: rtkit | chmod o-rwx "/proc"
# /usr/libexec/security-misc/permission-lockdown: user: colord | chmod o-rwx "/var/lib/colord"
# /usr/libexec/security-misc/permission-lockdown: user: Debian-exim | chmod o-rwx "/var/spool/exim4"
# /usr/libexec/security-misc/permission-lockdown: user: debian-tor | chmod o-rwx "/var/lib/tor"
# /usr/libexec/security-misc/permission-lockdown: user: stunnel4 | chmod o-rwx "/var/run/stunnel4"
# /usr/libexec/security-misc/permission-lockdown: user: iodine | chmod o-rwx "/var/run/iodine"
# /usr/libexec/security-misc/permission-lockdown: user: apt-cacher-ng | chmod o-rwx "/var/cache/apt-cacher-ng"
# /usr/libexec/security-misc/permission-lockdown: user: statd | chmod o-rwx "/var/lib/nfs"
# /usr/libexec/security-misc/permission-lockdown: user: timidity | chmod o-rwx "/etc/timidity"
# /usr/libexec/security-misc/permission-lockdown: user: uuidd | chmod o-rwx "/run/uuidd"
# /usr/libexec/security-misc/permission-lockdown: user: _rpc | chmod o-rwx "/run/rpcbind"
# /usr/libexec/security-misc/permission-lockdown: user: geoclue | chmod o-rwx "/var/lib/geoclue"

home_folder_access_rights_lockdown() {
   mkdir --parents /var/cache/security-misc/state-files
   local user
   for user in $(dir /home); do ## lists directories only
      if [ -f "/var/cache/security-misc/state-files/$user" ]; then
         continue
      fi
      folder_name="/home/$user"
      ## chmod:
      ## The 'g' for 'group' is not needed.
      ## Debian by default uses USERGROUPS=yes in /etc/adduser.conf.
      ## The group which the user is being added to has the same name as the user.
      ## If the username is user then the name of the group is also user.
      ## Some background information here:
      ## https://unix.stackexchange.com/questions/156473/reasons-behind-the-default-groups-and-users-on-linux
      ## In short, this is useful for "file sharing". A if user1 wants to share data with user2 the command
      ## required to run is sudo addgroup user1 user2.
      ## See also: user private groups UPGs
      ## https://wiki.debian.org/UserPrivateGroups
      echo "$0: chmod o-rwx \"$folder_name\""
      chmod o-rwx "$folder_name"
      touch "/var/cache/security-misc/state-files/$user"
   done
}

home_folder_access_rights_lockdown

exit 0