AppArmor

Installation

Testers only!

It is recommended to install the available AppArmor profiles for improved security on the Whonix ™ platform.

Qubes Users Note

Qubes-Whonix ™ users require some extra steps to set up AppArmor. Non-Qubes-Whonix ™ users can skip this section.

If you are interested, click on Expand on the right.

Note:

• Complete these instructions in dom0 for both whonix-gw-15 and whonix-ws-15 TemplateVMs.
• After changes are made to the Whonix ™ templates, the sys-whonix (ProxyVM) and anon-whonix (AppVM) will inherit the AppArmor kernel settings.
  • The sys-whonix and anon-whonix TemplateBasedVMs do not need to be recreated to benefit from the new kernel parameters.
• Verify AppArmor is active in both sys-whonix and anon-whonix after changes are made.

Whonix-Gateway ™

1. Open a dom0 terminal.

Qubes App Launcher (blue/grey "Q") → System Tools → Xfce Terminal

2. List the current kernel parameters.

qvm-prefs -g whonix-gw-15 kernelopts

qvm-prefs -g whonix-gw-15 kernelopts

Qubes R4.0 and later releases will show.

nopat

3. Keep the existing kernel parameters and add 'apparmor=1 security=apparmor'.

For example.

qvm-prefs -s whonix-gw-15 kernelopts "nopat apparmor=1 security=apparmor"

qvm-prefs -s whonix-gw-15 kernelopts "nopat apparmor=1 security=apparmor"

qvm-prefs -s sys-whonix kernelopts "nopat apparmor=1 security=apparmor"

qvm-prefs -s sys-whonix kernelopts "nopat apparmor=1 security=apparmor"

4. List the kernel parameters again.

qvm-prefs -g whonix-gw-15 kernelopts

qvm-prefs -g whonix-gw-15 kernelopts

The output should show AppArmor is part of the new kernel parameters. For example.

nopat apparmor=1 security=apparmor

5. Start sys-whonix ProxyVM and confirm AppArmor is active.

sudo aa-status --enabled ; echo $?

sudo aa-status --enabled ; echo $?

The output should show.

0

Whonix-Workstation ™

1. Open a dom0 terminal.

Qubes App Launcher (blue/grey "Q") → System Tools → Xfce Terminal

2. List the current kernel parameters.

qvm-prefs -g whonix-ws-15 kernelopts

qvm-prefs -g whonix-ws-15 kernelopts

Qubes R4.0 and later releases will show.

nopat

3. Keep the existing kernel parameters and add 'apparmor=1 security=apparmor'.

For example.

qvm-prefs -s whonix-ws-15 kernelopts "nopat apparmor=1 security=apparmor"

qvm-prefs -s whonix-ws-15 kernelopts "nopat apparmor=1 security=apparmor"

qvm-prefs -s anon-whonix kernelopts "nopat apparmor=1 security=apparmor"

qvm-prefs -s anon-whonix kernelopts "nopat apparmor=1 security=apparmor"

4. List the current kernel parameters again.

qvm-prefs -g whonix-ws-15 kernelopts

qvm-prefs -g whonix-ws-15 kernelopts

The output should show AppArmor is part of the new kernel parameters. For example.

nopat apparmor=1 security=apparmor

5. Start anon-whonix AppVM and confirm AppArmor is active.

sudo aa-status --enabled ; echo $?

sudo aa-status --enabled ; echo $?

The output should show.

0

Install all AppArmor Profiles

The easiest method is to install all available AppArmor profiles. This can result in a few profiles being enforced for software that is not installed, but this will not have any adverse impacts.

sudo apt-get install apparmor-profiles-hardened-debian

sudo apt-get install apparmor-profiles-hardened-debian

Install Select AppArmor Profiles

Click on Expand on the right side.

Profile for Tor Browser. Useful in Whonix-Workstation ™.

sudo apt-get install apparmor-profile-torbrowser

sudo apt-get install apparmor-profile-torbrowser

Profile for the HexChat client. Useful in Whonix-Workstation ™.

sudo apt-get install apparmor-profile-xchat

sudo apt-get install apparmor-profile-xchat

Profile for the Mozilla Thunderbird E-Mail client. Useful in Whonix-Workstation ™.

sudo apt-get install apparmor-profile-icedove

sudo apt-get install apparmor-profile-icedove

Profile for VirtualBox. This is useful on the host, but instructions are not available for this procedure. It is also useful if running VirtualBox inside VirtualBox.

sudo apt-get install apparmor-profile-virtualbox

sudo apt-get install apparmor-profile-virtualbox

Profile Unloading

The name of the specific profile to unload must be known in advance; refer to the list further above.

If it is necessary to disable an AppArmor profile, first list those which are available.

ls /etc/apparmor.d/

ls /etc/apparmor.d/

Once a profile is loaded in the kernel, it can be easily removed.

sudo aa-disable /etc/apparmor.d/profile-name

sudo aa-disable /etc/apparmor.d/profile-name

This command expects the profile file to exist, so if it has been manually deleted or removed via apt-get purge, it can only be unloaded by rebooting.

Common Operations

Maintain Tor Browser Functionality

Tor Browser upgrades frequently break the Whonix ™ AppArmor profile used to contain it. Even when AppArmor-related fixes are confirmed in Phabricator, most often the packages are not made available to Whonix ™ stable or even the developer version. This means manual profile fixes are often required until the next Whonix ™ version is released.

If Tor Browser is non-functional with the available AppArmor profile, follow these steps to rectify the problem.

1. Open a terminal in Whonix-Workstation ™ (whonix-ws-15).

whonix-ws-15 → Konsole

2. List the available AppArmor profiles.

ls /etc/apparmor.d/

ls /etc/apparmor.d/

3. Edit the Tor Browser AppArmor profile.

Note: change the name of the file to match whatever version is installed on the system.

sudo nano /etc/apparmor.d/home.tor-browser.firefox

sudo nano /etc/apparmor.d/home.tor-browser.firefox

4. Navigate to the Whonix ™ Github resource for AppArmor.

The latest git commits can be found here.

Select Code → etc/apparmor.d → home.tor-browser.firefox

Select the Raw button on the right-hand side.

It is recommended to check the profile does not contain any unexpected content. For greater security, utilize a different viewer and/or retrieve the profile using git and perform git commit gpg verification.

Cut and paste the profile text into the old Tor Browser profile which is open in nano. Save and exit.

5. Enforce the new Tor Browser profile.

In the command below, change the name of the file to match whatever version is installed on the system.

In Whonix-Workstation ™ (whonix-ws-15), run.

sudo aa-enforce /etc/apparmor.d/home.tor-browser.firefox

sudo aa-enforce /etc/apparmor.d/home.tor-browser.firefox

6. Shutdown Whonix-Workstation ™ (whonix-ws-15).

7. Restart Whonix-Workstation ™ (anon-whonix).

Launch Tor Browser. If everything has been applied correctly, Tor Browser will have full functionality. If the following AppArmor warning appears, it can be safely ignored.

Profile: /etc/apparmor.d/home.tor-browser.firefox Operation: open Name: /dev/ Denied: r Logfile: /var/log/kern.log For more information, please see: https://wiki.ubuntu.com/DebuggingApparmor

8. Manually check AppArmor is correctly running and enforced.

In a terminal, run.

sudo aa-status

sudo aa-status

The output should show the Tor Browser profile is loaded and in enforce mode.

Correcting Other Whonix ™ AppArmor Profiles

The same method can be used to resolve other AppArmor problems impacting full functionality of applications in Whonix ™. For instance, in Whonix ™ 13 the whonixcheck AppArmor profile caused continuous "denied" messages in Qubes-Whonix ™. Correcting this issue was quite simple:

1. Navigate to the raw, updated whonixcheck profile.
2. Replace the existing content in /etc/apparmor.d/usr.bin.whonixcheck with the updated github content, in both TemplateVMs whonix-gw-15 and whonix-ws-15.
3. Shut down both TemplateVMs and any running instances of sys-whonix and anon-whonix.
4. Restart sys-whonix and anon-whonix.

Inspecting and Disabling AppArmor Notifications

From Whonix ™ 14, apparmor-notify is no longer installed by default. This means desktop notifications will not appear concerning AppArmor denied messages, which are stored in /var/log/audit/audit.log

Inspect Notifications

To inspect relevant logs, run.

Open file /var/log/audit/audit.log in an editor with root rights.

(Qubes-Whonix ™: In TemplateVM)

This box uses lxsudo for root privilege escalation and mousepad as editor. These are examples. Other tools could archive the same goal too. If these example tools do not work for you or if you are not using Whonix, please see this link.

If you are using a graphical Whonix or Qubes-Whonix ™ with XFCE, run.

lxsudo mousepad /var/log/audit/audit.log

lxsudo mousepad /var/log/audit/audit.log

If you are using a terminal-only Whonix, run.

sudo nano /var/log/audit/audit.log

sudo nano /var/log/audit/audit.log

To show denied AppArmor messages of any age, run.

sudo cat /var/log/audit/audit.log | grep -i DENIED

sudo cat /var/log/audit/audit.log | grep -i DENIED

It is possible to keep watching the file as it is appended. This is useful for reproducing AppArmor denied messages and testing amended profiles.

sudo tail -f /var/log/audit/audit.log | grep --line-buffered DENIED

sudo tail -f /var/log/audit/audit.log | grep --line-buffered DENIED

Disable Notifications

If apparmor-notify is manually installed, then on occasion an application may be functional but AppArmor "denied" messages constantly appear. Rather than updating the relevant AppArmor profile(s), it is possible to disable notifications instead.

In the offending Whonix ™ (App)VM, launch Konsole and run.

sudo killall aa-notify

sudo killall aa-notify

To revert this change, reboot the VM.

More Profiles

It is possible to utilize profiles by other vendors, but this is unsupported by Whonix ™ developers. As a reminder, it is not necessary to install AppArmor profiles for any applications that are unlikely to be used (such as dovecot). Additional options include:

• Debian has packages that can be easily installed via the APT package manager.
• Ubuntu also provides profiles. It is not easy to download these as a package to be installed in Debian. Further, the profiles may or may not differ from (or complement) profiles listed earlier.

Support

• Need help? Visit the Whonix ™ AppArmor Forum
• Profile Creation Advice

Development

• Whonix ™ AppArmor Profiles Development Discussion
• Open Tasks

Footnotes

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