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pct: move "disable apparmor" in new subsection for security considerations

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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2020-02-14 17:48:00 +01:00
parent bf7f598a79
commit c02ac25bcc
1 changed files with 27 additions and 19 deletions
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pct.adoc
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@ -316,25 +316,11 @@ systemd version running inside the container should be equal to or greater than
Privileged Containers Privileged Containers
^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^
Security in containers is achieved by using mandatory access control Security in containers is achieved by using mandatory access control 'AppArmor'
('AppArmor'), 'seccomp' filters and namespaces. The LXC team considers this restrictions, 'seccomp' filters and Linux kernel namespaces. The LXC team
kind of container as unsafe, and they will not consider new container escape considers this kind of container as unsafe, and they will not consider new
exploits to be security issues worthy of a CVE and quick fix. That's why container escape exploits to be security issues worthy of a CVE and quick fix.
privileged containers should only be used in trusted environments. That's why privileged containers should only be used in trusted environments.
Although it is not recommended, AppArmor can be disabled for a container. This
brings security risks with it. Some syscalls can lead to privilege escalation
when executed within a container if the system is misconfigured or if a LXC or
Linux Kernel vulnerability exists.
To disable AppArmor for a container, add the following line to the container
configuration file located at `/etc/pve/lxc/CTID.conf`:
----
lxc.apparmor_profile = unconfined
----
WARNING: Please note that this is not recommended for production use.
[[pct_cpu]] [[pct_cpu]]
@ -567,6 +553,9 @@ untrusted people.
To reduce the attack surface, LXC uses many security features like AppArmor, To reduce the attack surface, LXC uses many security features like AppArmor,
CGroups and kernel namespaces. CGroups and kernel namespaces.
AppArmor
~~~~~~~~
AppArmor profiles are used to restrict access to possibly dangerous actions. AppArmor profiles are used to restrict access to possibly dangerous actions.
Some system calls, i.e. `mount`, are prohibited from execution. Some system calls, i.e. `mount`, are prohibited from execution.
@ -576,6 +565,25 @@ To trace AppArmor activity, use:
# dmesg | grep apparmor # dmesg | grep apparmor
---- ----
Although it is not recommended, AppArmor can be disabled for a container. This
brings security risks with it. Some syscalls can lead to privilege escalation
when executed within a container if the system is misconfigured or if a LXC or
Linux Kernel vulnerability exists.
To disable AppArmor for a container, add the following line to the container
configuration file located at `/etc/pve/lxc/CTID.conf`:
----
lxc.apparmor_profile = unconfined
----
WARNING: Please note that this is not recommended for production use.
// TODO: describe cgroups + seccomp a bit more.
// TODO: pve-lxc-syscalld
Guest Operating System Configuration Guest Operating System Configuration
------------------------------------ ------------------------------------