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Bug 1718701

Summary:	Policy blocks dhcpd from reading rndc.key
Product:	[Fedora] Fedora	Reporter:	Michael Cronenworth <mike>
Component:	selinux-policy	Assignee:	Lukas Vrabec <lvrabec>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	low
Version:	30	CC:	dwalsh, lvrabec, mgrepl, plautrba, scott-fedora, zpytela
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	selinux-policy-3.14.3-39.fc30	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-20 02:54:48 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Michael Cronenworth 2019-06-10 01:02:27 UTC

Description of problem:
I upgraded from Fedora 29 to 30. After the upgrade dhcpd was not starting.

setroubleshoot[5744]: SELinux is preventing dhcpd from map access on the file /etc/rndc.key

# ls -lZ /etc/rndc.key 
-rw-r-----. 1 root named system_u:object_r:dnssec_t:s0 112 Jun  9 19:54 /etc/rndc.key


Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-37.fc30.noarch

How reproducible:
Always


Steps to Reproduce:
1. Install dhcp-server
2. Add a dynamic dns key (rndc key)
3. systemctl start dhcpd

Actual results:
Fails to start


Expected results:
DHCPd Starts

Additional info:
SELinux recommends to turn on the following bool:
setsebool -P domain_can_mmap_files 1

Setting this bool does allow dhcpd to start, but I don't think that is a proper fix.

The dhcpd versions between Fedora 29 and 30 are the same. It's the SELinux policy that has changed.

Comment 1 Lukas Vrabec 2019-06-10 16:00:13 UTC

Hi, 

Could you please reproduce the scenario and then attach output of:

# ausearch -m AVC -ts recent 

Thanks,
Lukas.

Comment 2 Michael Cronenworth 2019-06-11 13:23:06 UTC

# ausearch -m AVC -ts recent
----
time->Tue Jun 11 08:22:34 2019
type=AVC msg=audit(1560259354.598:1807): avc:  denied  { map } for  pid=18541 comm="dhcpd" path="/etc/rndc.key" dev="dm-0" ino=53871458 scontext=system_u:system_r:dhcpd_t:s0 tcontext=system_u:object_r:dnssec_t:s0 tclass=file permissive=0

Comment 3 Lukas Vrabec 2019-06-12 15:48:02 UTC

commit e8298ee57267c9f3d4592b8feb76fc81fffbe155 (HEAD -> rawhide)
Author: Lukas Vrabec <lvrabec>
Date:   Wed Jun 12 17:47:41 2019 +0200

    Allow dhcpd_t domain to mmap dnssec_t files BZ(1718701)

Comment 4 Fedora Update System 2019-06-18 11:32:04 UTC

FEDORA-2019-9da5c35472 has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-9da5c35472

Comment 5 Fedora Update System 2019-06-19 01:02:57 UTC

selinux-policy-3.14.3-39.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-2019-9da5c35472

Comment 6 Fedora Update System 2019-06-20 02:54:48 UTC

selinux-policy-3.14.3-39.fc30 has been pushed to the Fedora 30 stable repository. If problems still persist, please make note of it in this bug report.