AppArmor : Enable / Disable AppArmor2023/07/13

	This is the Basic Usage and Configuration for AppArmor (Application Armor). It's possible to use MAC (Mandatory Access Control) feature on Ubuntu for various resources by AppArmor.
[1]	Display the current status of AppArmor to use AppArmor. (Follow is the status of default settings after installing Ubuntu)

# show status
# 13 profiles are loaded in [enforce] mode

root@dlp:~#

aa-status

apparmor module is loaded.
10 profiles are loaded.
10 profiles are in enforce mode.
   /usr/bin/man
   /usr/lib/NetworkManager/nm-dhcp-client.action
   /usr/lib/NetworkManager/nm-dhcp-helper
   /usr/lib/connman/scripts/dhclient-script
   /{,usr/}sbin/dhclient
   lsb_release
   man_filter
   man_groff
   nvidia_modprobe
   nvidia_modprobe//kmod
0 profiles are in complain mode.
0 profiles are in kill mode.
0 profiles are in unconfined mode.
0 processes have profiles defined.
0 processes are in enforce mode.
0 processes are in complain mode.
0 processes are unconfined but have a profile defined.
0 processes are in mixed mode.
0 processes are in kill mode.

# configuration files of each profile are under the directory below

root@dlp:~#

ll /etc/apparmor.d

total 40
drwxr-xr-x 2 root root 4096 Jun 11 19:27 abi
drwxr-xr-x 4 root root 4096 Jun 11 19:27 abstractions
drwxr-xr-x 2 root root 4096 Feb 14 05:49 disable
drwxr-xr-x 2 root root 4096 Feb 14 05:49 force-complain
drwxr-xr-x 2 root root 4096 Jun 11 19:30 local
-rw-r--r-- 1 root root 1379 Feb 14 05:49 lsb_release
-rw-r--r-- 1 root root 1189 Feb 14 05:49 nvidia_modprobe
-rw-r--r-- 1 root root 3461 Mar 30 04:02 sbin.dhclient
drwxr-xr-x 5 root root 4096 Jun 11 19:27 tunables
-rw-r--r-- 1 root root 3448 Mar 12 17:23 usr.bin.man

[2]	If you'd like to disable AppArmor itself, configure like follows.

# unload current all loaded profiles

root@dlp:~#

aa-teardown

Unloading AppArmor profiles

root@dlp:~#

aa-status

apparmor module is loaded.

# disable loading profiles when system booting

root@dlp:~#

systemctl disable apparmor

Synchronizing state of apparmor.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install disable apparmor
Removed /etc/systemd/system/sysinit.target.wants/apparmor.service.

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