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https://issues.apache.org/jira/browse/HDDS-1609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867778#comment-16867778
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Eric Yang commented on HDDS-1609:
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{quote}I know that the test results are generated with different user. Can you
please confirm that this is the 'privilege escalation' problem?{quote}
Yes, confirmed. The developer who ran the smoke test have admin privileges
because he has rights to run docker command. The generated files are given
world read/write permission and owned by a non-admin user (uid 1000) without
developer's consent. This allows non-admin user to delete files that should
have been administrator files. Hence, privileges escalation can occur for
non-admin user.
{quote}
This can be fixed easily with adjusting the $RESULT_DIR_INSIDE environment
variable in hadoop-ozone/dist/src/main/compose/testlib.sh{quote}
Tweaking the RESULT_DIR_INSIDE doesn't solve the permission problem. It can be
moved to another location, but the ownership of the file is still wrong on
host. It would be easier to pass host uid to docker container to ensure the
file are generated using the same uid/gid as the caller. I don't understand
the resist to use -u flag here. Please elaborate if you have concern regarding
-u flag.
> Remove hard coded uid from Ozone docker image
> ---------------------------------------------
>
> Key: HDDS-1609
> URL: https://issues.apache.org/jira/browse/HDDS-1609
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Reporter: Eric Yang
> Priority: Major
> Fix For: 0.5.0
>
> Attachments: linux.txt, log.html, osx.txt, report.html
>
>
> Hadoop-runner image is hard coded to [USER
> hadoop|https://github.com/apache/hadoop/blob/docker-hadoop-runner-jdk11/Dockerfile#L45]
> and user hadoop is hard coded to uid 1000. This arrangement complicates
> development environment where host user is different uid from 1000. External
> bind mount locations are written data as uid 1000. This can prevent
> development environment from clean up test data.
> Docker documentation stated that "The best way to prevent
> privilege-escalation attacks from within a container is to configure your
> container’s applications to run as unprivileged users." From Ozone
> architecture point of view, there is no reason to run Ozone daemon to require
> privileged user or hard coded user.
> h3. Solution 1
> It would be best to support running docker container as host user to reduce
> friction. User should be able to run:
> {code}
> docker run -u $(id -u):$(id -g) ...
> {code}
> or in docker-compose file:
> {code}
> user: "${UID}:${GID}"
> {code}
> By doing this, the user will be name less in docker container. Some commands
> may warn that user does not have a name. This can be resolved by mounting
> /etc/passwd or a file that looks like /etc/passwd that contain host user
> entry.
> h3. Solution 2
> Move the hard coded user to range < 200. The default linux profile reserves
> service users < 200 to have umask that keep data private to service user or
> group writable, if service shares group with other service users. Register
> the service user with Linux vendors to ensure that there is a reserved uid
> for Hadoop user or pick one that works for Hadoop. This is a longer route to
> pursuit, and may not be fruitful.
> h3. Solution 3
> Default the docker image to have sssd client installed. This will allow
> docker image to see host level names by binding sssd socket. The instruction
> for doing this is located at in [Hadoop website|
> https://hadoop.apache.org/docs/r3.1.2/hadoop-yarn/hadoop-yarn-site/DockerContainers.html#User_Management_in_Docker_Container].
> The pre-requisites for this approach will require the host level system to
> have sssd installed. For production system, there is a 99% chance that sssd
> is installed.
> We may want to support combined solution of 1 and 3 to be proper.
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