RFC(v2): Audit Kernel Container IDs

Casey Schaufler casey at schaufler-ca.com
Mon Dec 11 16:52:43 UTC 2017


On 12/11/2017 8:30 AM, Eric Paris wrote:
> On Sat, 2017-12-09 at 10:28 -0800, Casey Schaufler wrote:
>> Because a container doesn't have to use namespaces to be a container
>> you still need a mechanism for a process to declare that it is in
>> fact
>> in a container, and to identify the container.
> I like the idea but I'm still tossing it around in my head (and
> thinking about Casey's statement too). Lets say we have a 'docker-like' 
> container with pid=100  netns=X,userns=Y,mountns=Z. If I'm on the host
> in all init namespaces and I run
>   nsenter -t 100 -n ip link set eth0 promisc on
> How should this be logged? Did this command run in it's own 'container'
> unrelated to the 'docker-like' container?

Jose Bollo's PTAGS ( https://gitlab.com/jobol/ptags ) would be
prefect. Any time you declare something to be a container or
enter a namespace you slap a tag on it. Identifying nested
containers would be easy, you'd have multiple tags.

PTAGS unfortunately needs module stacking, but how hard could that be?


> -Eric



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