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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7516) Security check for untrusted docker image
Date Thu, 11 Jan 2018 21:18:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16322956#comment-16322956
] 

Eric Yang commented on YARN-7516:
---------------------------------

[~ebadger] In hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/test/utils/test_docker_util.cc
test case, we have example around line 935.  This shows the syntax that we used to accomplish
this.

Quote from [Docker documentation|https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities]:
{quote} 
In addition to --privileged, the operator can have fine grain control over the capabilities
using --cap-add and --cap-drop. By default, Docker has a default list of capabilities that
are kept. The following table lists the Linux capability options which are allowed by default
and can be dropped.
{quote}

I'd participated in testing for those flags several years ago, hence I am confident they work
as designed.  {cap-drop} flag can be used to accompany {{--privileged}} flag for fine grain
control.

> Security check for untrusted docker image
> -----------------------------------------
>
>                 Key: YARN-7516
>                 URL: https://issues.apache.org/jira/browse/YARN-7516
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>         Attachments: YARN-7516.001.patch, YARN-7516.002.patch, YARN-7516.003.patch, YARN-7516.004.patch,
YARN-7516.005.patch, YARN-7516.006.patch, YARN-7516.007.patch
>
>
> Hadoop YARN Services can support using private docker registry image or docker image
from docker hub.  In current implementation, Hadoop security is enforced through username
and group membership, and enforce uid:gid consistency in docker container and distributed
file system.  There is cloud use case for having ability to run untrusted docker image on
the same cluster for testing.  
> The basic requirement for untrusted container is to ensure all kernel and root privileges
are dropped, and there is no interaction with distributed file system to avoid contamination.
 We can probably enforce detection of untrusted docker image by checking the following:
> # If docker image is from public docker hub repository, the container is automatically
flagged as insecure, and disk volume mount are disabled automatically, and drop all kernel
capabilities.
> # If docker image is from private repository in docker hub, and there is a white list
to allow the private repository, disk volume mount is allowed, kernel capabilities follows
the allowed list.
> # If docker image is from private trusted registry with image name like "private.registry.local:5000/centos",
and white list allows this private trusted repository.  Disk volume mount is allowed, kernel
capabilities follows the allowed list.



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