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Merge pull request #20515 from raesene/patch-1

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Update security.md with basic User Namespace info.
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Sebastiaan van Stijn 2016-02-26 14:02:46 +01:00
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docs/security/security.md
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@ -243,26 +243,16 @@ with e.g., special network topologies or shared filesystems, you can
expect to see tools to harden existing Docker containers without
affecting Docker's core.
Recent improvements in Linux namespaces will soon allow to run
full-featured containers without root privileges, thanks to the new user
namespace. This is covered in detail [here](
http://s3hh.wordpress.com/2013/07/19/creating-and-using-containers-without-privilege/).
Moreover, this will solve the problem caused by sharing filesystems
between host and guest, since the user namespace allows users within
containers (including the root user) to be mapped to other users in the
host system.
As of Docker 1.10 User Namespaces are supported directly by the docker
daemon. This feature allows for the root user in a container to be mapped
to a non uid-0 user outside the container, which can help to mitigate the
risks of container breakout. This facility is available but not enabled
by default.
Today, Docker does not directly support user namespaces, but they
may still be utilized by Docker containers on supported kernels,
by directly using the clone syscall, or utilizing the 'unshare'
utility. Using this, some users may find it possible to drop
more capabilities from their process as user namespaces provide
an artificial capabilities set. Likewise, however, this artificial
capabilities set may require use of 'capsh' to restrict the
user-namespace capabilities set when using 'unshare'.
Eventually, it is expected that Docker will have direct, native support
for user-namespaces, simplifying the process of hardening containers.
Refer to the [daemon command](../reference/commandline/daemon.md#daemon-user-namespace-options)
in the command line reference for more information on this feature.
Additional information on the implementation of User Namespaces in Docker
can be found in <a href="https://integratedcode.us/2015/10/13/user-namespaces-have-arrived-in-docker/" target="_blank">this blog post</a>.
## Conclusions