apparmor.d/profiles/exim4

# vim:syntax=apparmor
# ------------------------------------------------------------------
#
#    Copyright (C) 2018-2021 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/exim4
profile exim4 @{exec_path} {
  include <abstractions/base>
  include <abstractions/consoles>
  include <abstractions/nameservice-strict>

  network inet dgram,
  network inet6 dgram,
  network inet stream,
  network inet6 stream,
  network netlink raw,

  @{exec_path} mrix,

  # To bind to port 25/tcp
  capability net_bind_service,

  # To remove the following error:
  #  exim4[]: exim: setgroups() failed: Operation not permitted
  capability setgid,

  # To remove the following error:
  #  exim4[]: unable to set gid=110 or uid=105 (euid=0): calling tls_validate_require_cipher
  capability setuid,

  # To remove the following error:
  # exim4[]: Cannot open main log file "/var/log/exim4/mainlog": Permission denied: euid=0 egid=110
  capability dac_read_search,
  capability dac_override,

  # To remove the following error:
  #  exim.c:774: chown(/var/spool/exim4//msglog//1kqH5Z-000RUf-UR, 105:110) failed (Operation not
  #  permitted). Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391
  capability chown,

  # To remove the following error:
  #  Couldn't chmod message log /var/spool/exim4//msglog//1kqH6c-000S7r-Ni: Operation not permitted
  capability fowner,

  # Needed?
  audit deny capability net_admin,

  /var/lib/exim4/config.autogenerated{,.tmp} r,

  /etc/email-addresses r,
  /etc/aliases r,

  deny /var/log/exim4/ w,
  /var/log/exim4/mainlog w,
  /var/log/exim4/paniclog w,

  owner /var/spool/exim4/ r,
        /var/spool/exim4/input/ r,
        /var/spool/exim4/input/*-*-*-* rwk,
  owner /var/spool/exim4/input/hdr.*-*-* rw,
  owner /var/spool/exim4/input/hdr.@{pid} rw,
        /var/spool/exim4/db/retry.lockfile rwk,
        /var/spool/exim4/msglog/*-*-* w,

  owner /var/mail/* rwk,
  owner /var/mail/*.lock.*.[0-9a-f]*.[0-9a-f]* w,
  owner /var/mail/*.lock wl -> /var/mail/*.lock.*.[0-9a-f]*.[0-9a-f]*,

  owner @{run}/exim4/exim.pid rw,

  owner @{run}/dbus/system_bus_socket rw,

  # file_inherit
  /tmp/#[0-9]*[0-9] rw,
  /var/lib/dpkg/status r,
  /var/log/cron-apt/lastfullmessage r,

  include if exists <local/exim4>
}