# vim:syntax=apparmor
# ------------------------------------------------------------------
#
#    Copyright (C) 2019-2021 Mikhail Morfikov
#
#    This program is free software; you can redistribute it and/or
#    modify it under the terms of version 2 of the GNU General Public
#    License published by the Free Software Foundation.
#
# ------------------------------------------------------------------

abi <abi/3.0>,

include <tunables/global>

@{exec_path} = /{usr/,}sbin/userdel
profile userdel @{exec_path} flags=(attach_disconnected) {
  include <abstractions/base>
  include <abstractions/consoles>
  include <abstractions/nameservice-strict>

  # The userdel command is issued as root and its task is to delete regular user accounts. It
  # optionally can remove user files (via --remove). Because of that, the userdel command needs the
  # following CAPs to be able to do so.
  capability dac_read_search,
  capability dac_override,

  # To write records to the kernel auditing log.
  capability audit_write,

  # To set the right permission to the files in the /etc/ dir).
  capability chown,
  capability fsetid,

  # To prevent removing a user when it's used by some process.
  capability sys_ptrace,
  ptrace (read),

  network netlink raw,

  @{exec_path} mr,

  /etc/login.defs r,

  @{PROC}/ r,
  @{PROC}/@{pids}/task/ r,

  /etc/{passwd,shadow,gshadow,group,subuid,subgid} rw,
  /etc/{passwd,shadow,gshadow,group,subuid,subgid}.@{pid} w,
  /etc/{passwd,shadow,gshadow,group,subuid,subgid}- w,
  /etc/{passwd,shadow,gshadow,group,subuid,subgid}+ rw,

  /etc/passwd.lock  wl -> /etc/passwd.@{pid},
  /etc/shadow.lock  wl -> /etc/shadow.@{pid},
  /etc/group.lock   wl -> /etc/group.@{pid},
  /etc/gshadow.lock wl -> /etc/gshadow.@{pid},
  /etc/subuid.lock  wl -> /etc/subuid.@{pid},
  /etc/subgid.lock  wl -> /etc/subgid.@{pid},

  # A process first uses lckpwdf() to lock the lock file, thereby gaining exclusive rights to
  # modify the /etc/passwd or /etc/shadow password database.
  /etc/.pwd.lock rwk,

  # To remove user home files
  @{HOME}/ rw,
  @{HOME}/** w,

  # To remove user mail
  /var/mail/* w,

  include if exists <local/userdel>
}