x0rg
/
9x0rg.com
1
0
Fork 0
Code Releases Activity

typo

This commit is contained in:
Wonderfall 2022-03-31 00:37:03 +02:00
parent 5311f454c9
commit 150838069b
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
content/posts/docker-hardening.md
View File

@ -79,7 +79,7 @@ root can be avoided in different ways in the final container:
- Container creation time: via the tools available (`user:` in the Compose file). - Container creation time: via the tools available (`user:` in the Compose file).
- Container runtime: degrading privileges with entrypoints scripts (`gosu UID:GID`). - Container runtime: degrading privileges with entrypoints scripts (`gosu UID:GID`).
Well-made images with security in mind will have a `USER` instruction. In my experience, most peole will run images blindly, so it's good harm reduction. Setting the user manually works in some images that aren't designed without root in mind, and it's also great to mitigate some *scenarii* where the image is controlled by an attacker. You also won't have surprises when mounting volumes, so I highly recommend setting the user explicitly and make sure volume permissions are correct once. Some images allow users to define their own UID/GID user with environment variables, with an entrypoint script that runs as root and takes care of the volume permissions before dropping privileges. While technically fine, it is still attack surface, and it requires the `SETUID`/`SETGID` capabilities to be available in the container. Well-made images with security in mind will have a `USER` instruction. In my experience, most people will run images blindly, so it's good harm reduction. Setting the user manually works in some images that aren't designed without root in mind, and it's also great to mitigate some *scenarii* where the image is controlled by an attacker. You also won't have surprises when mounting volumes, so I highly recommend setting the user explicitly and make sure volume permissions are correct once. Some images allow users to define their own UID/GID user with environment variables, with an entrypoint script that runs as root and takes care of the volume permissions before dropping privileges. While technically fine, it is still attack surface, and it requires the `SETUID`/`SETGID` capabilities to be available in the container.
As mentioned just above, [user namespaces](https://www.man7.org/linux/man-pages/man7/user_namespaces.7.html) are a solution to ensure root in the container is not root on the host. Docker supports user namespaces, for instance you could set the default mapping in `/etc/docker/daemon.json`: As mentioned just above, [user namespaces](https://www.man7.org/linux/man-pages/man7/user_namespaces.7.html) are a solution to ensure root in the container is not root on the host. Docker supports user namespaces, for instance you could set the default mapping in `/etc/docker/daemon.json`: