Bug 1741609 - SELinux is preventing bacula-fd from using the 'dac_override' capabilities.
Summary: SELinux is preventing bacula-fd from using the 'dac_override' capabilities.
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 30
Hardware: x86_64
OS: Unspecified
Target Milestone: ---
Assignee: Zdenek Pytela
QA Contact: Fedora Extras Quality Assurance
Whiteboard: abrt_hash:2f1ecfb848afaddddfa6bafb2ad...
: 1747133 1771634 (view as bug list)
Depends On:
TreeView+ depends on / blocked
Reported: 2019-08-15 14:46 UTC by jan.vesely
Modified: 2021-01-14 10:41 UTC (History)
14 users (show)

Fixed In Version: selinux-policy-3.14.3-57.fc30
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2020-04-05 03:54:50 UTC
Type: ---

Attachments (Terms of Use)

Description jan.vesely 2019-08-15 14:46:39 UTC
Description of problem:
SELinux is preventing bacula-fd from using the 'dac_override' capabilities.

*****  Plugin dac_override (91.4 confidence) suggests   **********************

If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system
Then turn on full auditing to get path information about the offending file and generate the error again.

Turn on full auditing
# auditctl -w /etc/shadow -p w
Try to recreate AVC. Then execute
# ausearch -m avc -ts recent
If you see PATH record check ownership/permissions on file, and fix it,
otherwise report as a bugzilla.

*****  Plugin catchall (9.59 confidence) suggests   **************************

If you believe that bacula-fd should have the dac_override capability by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
allow this access for now by executing:
# ausearch -c 'bacula-fd' --raw | audit2allow -M my-baculafd
# semodule -X 300 -i my-baculafd.pp

Additional Information:
Source Context                system_u:system_r:bacula_t:s0
Target Context                system_u:system_r:bacula_t:s0
Target Objects                Unknown [ capability ]
Source                        bacula-fd
Source Path                   bacula-fd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.14.3-43.fc30.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 5.2.7-200.fc30.x86_64 #1 SMP Thu
                              Aug 8 05:35:29 UTC 2019 x86_64 x86_64
Alert Count                   6
First Seen                    2019-08-06 23:36:36 EDT
Last Seen                     2019-08-14 23:48:05 EDT
Local ID                      01eb4f68-ca4b-4140-9ed3-5fff9e51adde

Raw Audit Messages
type=AVC msg=audit(1565840885.804:2326): avc:  denied  { dac_override } for  pid=1414 comm="bacula-fd" capability=1  scontext=system_u:system_r:bacula_t:s0 tcontext=system_u:system_r:bacula_t:s0 tclass=capability permissive=0

Hash: bacula-fd,bacula_t,bacula_t,capability,dac_override

Version-Release number of selected component:

Additional info:
component:      selinux-policy
reporter:       libreport-2.10.1
hashmarkername: setroubleshoot
kernel:         5.2.7-200.fc30.x86_64
type:           libreport

Comment 1 Lukas Vrabec 2019-08-19 14:01:43 UTC
Hi Bacula devs, 

Does Bacula require to bypass DAC permissions also for writing on filesystem or search/read is enough? I assume for creating backup reasing the whole filesystem should be enough.


Comment 2 jan.vesely 2019-08-29 18:11:25 UTC
*** Bug 1747133 has been marked as a duplicate of this bug. ***

Comment 3 Zdenek Pytela 2019-11-13 16:23:06 UTC
*** Bug 1771634 has been marked as a duplicate of this bug. ***

Comment 4 Zdenek Pytela 2019-11-13 16:28:31 UTC
Simone and bacula folks,

bacula-fd requested the dac_override capability which is not allowed for the bacula_t domain. However, there already is dac_read_search granted: Is it sufficient for having bacula working?

Comment 5 Simone Caronni 2019-11-18 05:53:43 UTC
I will make some tests.

Comment 6 Jari Korva 2020-02-06 08:04:39 UTC
I got "dac_override" error while restoring folder structure to /var/tmp/bacula-restores on CentOS 8.1. At a quick glance it seems that I can't restore subfolders owned by regular users (non-root).

Comment 7 Zdenek Pytela 2020-02-10 13:40:32 UTC
I've submitted a PR to address the issue:

Comment 8 Lukas Vrabec 2020-02-10 15:36:34 UTC
commit 7c4e8a4167103ac7bca5c46c1625906f6bdc4608 (HEAD -> rawhide, origin/rawhide, origin/HEAD)
Author: Zdenek Pytela <zpytela@redhat.com>
Date:   Mon Feb 10 14:38:16 2020 +0100

    Allow bacula dac_override capability
    The dac_override capability is needed to restore permissions and ownership.
    Resolves: rhbz#1741609

Comment 9 Fedora Update System 2020-03-20 08:00:21 UTC
FEDORA-2020-cde9529d3d has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2020-cde9529d3d

Comment 10 Fedora Update System 2020-03-21 01:22:25 UTC
selinux-policy-3.14.3-57.fc30 has been pushed to the Fedora 30 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-2020-cde9529d3d

Comment 11 Fedora Update System 2020-04-05 03:54:50 UTC
FEDORA-2020-cde9529d3d has been pushed to the Fedora 30 stable repository.
If problem still persists, please make note of it in this bug report.

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