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A comment on macOS Containers v0.0.1. Parent comment

Re:macOS Containers v0.0.1 by insanitybit on Tuesday September 26, 2023 @09:39AM (#37659137)
I think it's an OK argument given that most people run (and have been running with no alternative until very recently) docker in such a way that there's a trivial privesc to root. In general it seems like docker users are, overall, willing to take that tradeoff.
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Re:macOS Containers v0.0.1 by dartos on Tuesday September 26, 2023 @12:09PM (#37661437)
How so? I use docker pretty frequently, but I’m sure that my user is part of the docker group before I do, so I don’t sudo anything.

Is there anything else I should be doing security wise?

I’ve been hearing podman is more secure, but I think it’s still containerd under the hood, so idk how true that is.

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Re:macOS Containers v0.0.1 by insanitybit on Tuesday September 26, 2023 @12:12PM (#37661471)
In general if you can `docker run` without sudo then that means you have a trivial privesc path since you can do `docker run` with the various flags that run it without any sandboxing, get a shell, and just ask to be let out of the namespace.

The way that podman and newer versions of docker get around this is using unprivileged user namespaces. Unprivileged user namespaces are not a free lunch - in fact, they're a bit of a security disaster in their own right.

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Re:macOS Containers v0.0.1 by aflukasz on Tuesday September 26, 2023 @01:56PM (#37663219)
In a typical installation, being in a docker group gives you access to a socket that controls docker daemon and that daemon runs as root. `sudo` is not important in this context.

Thankfully there is rootless mode for some time now: https://docs.docker.com/engine/security/rootless/.

Podman, too, can run in rootful and rootless mode. Rootless in podman still feels to me to be more like first class citizen, as opposed to docker case.

In both cases it's important to keep in mind in which mode you operate. Both from the perspective of security and day to day operations, as some aspects of behavior will differ between those modes.

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