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Less reliance on external resources

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This commit is contained in:
Jonah Aragon
2022-04-23 17:19:08 -05:00
committed by Daniel Gray
parent 313696132a
commit 33dc6b1211
6 changed files with 18 additions and 17 deletions
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docs/linux-desktop/sandboxing.en.md
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@@ -24,9 +24,9 @@ Hard-coded access to some kernel interfaces like [`/sys`](https://en.wikipedia.o
### Firejail
[Firejail](https://firejail.wordpress.com/) is another method of sandboxing. As it is a large [setuid](https://en.wikipedia.org/wiki/Setuid) binary, it has a large [attack surface](https://en.wikipedia.org/wiki/Attack_surface) which may assist in [privilege escalation](https://en.wikipedia.org/wiki/Privilege_escalation).
[Firejail](https://firejail.wordpress.com/) is another method of sandboxing. As it is a large [setuid](https://en.wikipedia.org/wiki/Setuid) binary, it has a large attack surface which may assist in [privilege escalation](https://en.wikipedia.org/wiki/Privilege_escalation).
The main risk is that Firejail may make the system safer from processes confined by it, but make it also less safe from processes running outside of Firejail. We [don’t recommend](https://madaidans-insecurities.github.io/linux.html#firejail) the use of Firejail.
[This post from a Whonix security researcher](https://madaidans-insecurities.github.io/linux.html#firejail) provides additional details on how Firejail can worsen the security of your device.
### Mandatory Access Control
@@ -55,7 +55,7 @@ For advanced users, you can make your own AppArmor profiles, SELinux policies, B
If you’re running a server you may have heard of Linux Containers, Docker, or Podman which refer to a kind of [OS-level virtualization](https://en.wikipedia.org/wiki/OS-level_virtualization). Containers are more common in server and development environments where individual apps are built to operate independently.
[Docker](https://en.wikipedia.org/wiki/Docker_(software)) is one of the most common container solutions. It does not run a proper sandbox, and this means that there is a large kernel [attack surface](https://en.wikipedia.org/wiki/Attack_surface). The [daemon](https://en.wikipedia.org/wiki/Daemon_(computing)) controls everything and [typically](https://docs.docker.com/engine/security/rootless/#known-limitations) runs as root. If it crashes for some reason, all the containers will crash too. The [gVisor](https://en.wikipedia.org/wiki/GVisor) runtime which implements an application level kernel can help limit the number of [syscalls](https://en.wikipedia.org/wiki/System_call) an application can make and can help isolate it from the host’s [kernel](https://en.wikipedia.org/wiki/Kernel_(operating_system)).
[Docker](https://en.wikipedia.org/wiki/Docker_(software)) is one of the most common container solutions. It does not run a proper sandbox, and this means that there is a large kernel attack surface. The [daemon](https://en.wikipedia.org/wiki/Daemon_(computing)) controls everything and [typically](https://docs.docker.com/engine/security/rootless/#known-limitations) runs as root. If it crashes for some reason, all the containers will crash too. The [gVisor](https://en.wikipedia.org/wiki/GVisor) runtime which implements an application level kernel can help limit the number of [syscalls](https://en.wikipedia.org/wiki/System_call) an application can make and can help isolate it from the host’s [kernel](https://en.wikipedia.org/wiki/Kernel_(operating_system)).
Red Hat develops [Podman](https://docs.podman.io/en/latest/) and secures it with SELinux to [isolate](https://www.redhat.com/sysadmin/apparmor-selinux-isolation) containers from each other. One of the notable differences between Docker and Podman is that Docker requires [root](https://en.wikipedia.org/wiki/Superuser) while Podman can run with [rootless containers](https://developers.redhat.com/blog/2020/09/25/rootless-containers-with-podman-the-basics) that are also [daemonless](https://developers.redhat.com/blog/2018/08/29/intro-to-podman), meaning if one crashes they don’t all come down.