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Bug 1517690 - `mv` in container tries to remove the MCS part of SELinux context
Summary: `mv` in container tries to remove the MCS part of SELinux context
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: container-selinux
Version: 26
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Lokesh Mandvekar
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-11-27 08:57 UTC by Standa Laznicka
Modified: 2017-12-12 13:41 UTC (History)
7 users (show)

Fixed In Version: container-selinux-2.36-1.fc27 container-selinux-2.36-1.fc26
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-12-10 05:07:08 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)

Description Standa Laznicka 2017-11-27 08:57:27 UTC 
Description of problem:
During an installation of FreeIPA in a container, most probably during the `pkispawn` time, there is a `mv` which tries to relabel two objects so that the MCS part of their context gets removed.

Version-Release number of selected component (if applicable):
Fedora 26 host, on Fedora 25 host this seems to work fine

How reproducible:
100%

Steps to Reproduce:
1. docker pull freeipa/freeipa-server:fedora-26
2. domain=IPA.TEST; docker run -t --name freeipa-popelnice -h $HOSTNAME \
                         --tmpfs /run --tmpfs /tmp \
                         -v /dev/urandom:/dev/random:ro -v /opt/ipa-data/master:/data \
                         -v /sys/fs/cgroup:/sys/fs/cgroup:ro --cap-add=SYS_TIME \
                         freeipa/freeipa-server:fedora-26 \
                        --hostname $HOSTNAME --domain $domain --realm ${domain^^} \
                        -p milan_je_buh123 -a milan_je_buh123 --setup-dns --auto-forwarders --no-reverse -U
3. ausearch -m avc

Actual results:
----
time->Mon Nov 27 02:44:49 2017
type=AVC msg=audit(1511768689.168:475): avc:  denied  { relabelfrom } for  pid=16032 comm="mv" name="logging.properties" dev="dm-0" ino=26096381 scontext=system_u:system_r:container_t:s0:c178,c726 tcontext=system_u:object_r:container_file_t:s0 tclass=lnk_file permissive=0
----
time->Mon Nov 27 02:44:49 2017
type=AVC msg=audit(1511768689.176:476): avc:  denied  { relabelfrom } for  pid=16032 comm="mv" name="CS.cfg.bak" dev="dm-0" ino=26096406 scontext=system_u:system_r:container_t:s0:c178,c726 tcontext=system_u:object_r:container_file_t:s0 tclass=lnk_file permissive=0
Fail: AVC messages found.

Expected results:
No AVCs

Additional info:
Running the container requires more workarounds, I will add an appropriate beaker job to this BZ.
Comment 2 Daniel Walsh 2017-11-27 13:03:37 UTC 
This is strange, It looks like the system thinks SElinux is enabled within the container?  If you run this same container but just launch and run a sh, does id -Z report that SELinux is disabled?
Comment 3 Standa Laznicka 2017-11-27 14:04:07 UTC 
`docker exec $CONTAINER_NAME id -Z` seems to correctly give:
"""
id: --context (-Z) works only on an SELinux-enabled kernel
"""
Comment 5 Daniel Walsh 2017-11-27 14:49:25 UTC 
Ok does some code do a mv -Z from inside of the contaiener on top of /opt/ipa-darta-master?  Is this content private to this container or do other containers need to use this data?

-v /opt/ipa-data-master:/data:Z 

Would fix this issue if it is private to this container.  And you could eliminate the chcon command from above.
Comment 6 Daniel Walsh 2017-11-27 14:58:49 UTC 
Ok I got it.

Fixed in container-selinux-2.36
Comment 7 Standa Laznicka 2017-11-27 15:19:14 UTC 
Thanks.

For the record - the data in /opt/ipa-data-master are supposed to be persistent container storage and can be used in different containers so the :Z way is unfortunately not possible.
Comment 8 Daniel Walsh 2017-11-27 15:37:09 UTC 
We were allowing the relabel on files and directories, but not on link_file which is what you are seeing.  I have updated container-selinux do allow it on all file types now.
Comment 9 Standa Laznicka 2017-11-27 16:33:47 UTC 
Thanks, tested the new package from koji and it seems to have fixed the problem for me.
Comment 10 Daniel Walsh 2017-11-27 17:13:56 UTC 
Ok I will push it into updates as tomorrow, since we have a container-selinux package update about to finish the updates process.

Once I push, could you update karma.
Comment 11 Fedora Update System 2017-11-28 13:34:28 UTC 
container-selinux-2.36-1.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2017-27cf1ada3a
Comment 12 Fedora Update System 2017-11-28 13:34:51 UTC 
container-selinux-2.36-1.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-acc79c0e3e
Comment 13 Fedora Update System 2017-11-28 18:37:00 UTC 
container-selinux-2.36-1.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-acc79c0e3e
Comment 14 Fedora Update System 2017-11-29 01:47:01 UTC 
container-selinux-2.36-1.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-27cf1ada3a
Comment 16 Fedora Update System 2017-12-10 05:07:08 UTC 
container-selinux-2.36-1.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.
Comment 17 Fedora Update System 2017-12-12 13:41:30 UTC 
container-selinux-2.36-1.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.
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