Bug 1563423

Summary:	SELinux prevents Postfix/cleanup from accessing OpenDKIM UNIX socket
Product:	Red Hat Enterprise Linux 7	Reporter:	are-support
Component:	selinux-policy	Assignee:	Lukas Vrabec <lvrabec>
Status:	CLOSED ERRATA	QA Contact:	Milos Malik <mmalik>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.4	CC:	are-support, lvrabec, mgrepl, mmalik, plautrba, ssekidde
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2018-10-30 10:03:16 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 are-support 2018-04-03 22:38:42 UTC

Description of problem:
SELinux prevents Postfix from accessing the OpenDKIM UNIX socket when it is specified under non_smtpd_milters.

Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-166.el7_4.9
postfix-2:2.10.1-6.el7
opendkim-2.11.0-0.1.el7

How reproducible:
Always, when OpenDKIM is configured to use a local UNIX socket and Postfix is configured to use it with non_smtpd_milters.

Steps to Reproduce:
1. Configure OpenDKIM to use a socket at /var/run/opendkim/opendkim.sock
2. Add the socket to Postfix using non_smtpd_milters = unix:/var/run/opendkim/opendkim.sock
3. Restart Postfix and try to send mail

Actual results:
OpenDKIM milter rejects mail with "postfix/cleanup[1612]: warning: connect to Milter service unix:/var/run/opendkim/opendkim.sock: Permission denied"

Expected results:
OpenDKIM milter should accept and process mail

Additional info:
Entries in audit.log confirm that SELinux is preventing access to the socket. Identical bug is shown here as fixed in Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=1436026. Using audit2allow to generate a custom policy addition solves the error.

Comment 2 Milos Malik 2018-06-13 13:48:49 UTC

Please collect SELinux denials and attach them here:

# ausearch -m avc -m user_avc -m selinux_err -m user_selinux_err -i -ts today

Comment 3 Milos Malik 2018-06-13 13:49:52 UTC

I'm sorry, they are already present in BZ#1436026.

Comment 4 are-support 2018-06-13 15:40:06 UTC

Here it is just in case:

type=AVC msg=audit(03/28/2018 11:22:33.110:2352) : avc:  denied  { connectto } for  pid=32428 comm=cleanup path=/run/opendkim/opendkim.sock scontext=system_u:system_r:postfix_cleanup_t:s0 tcontext=system_u:system_r:dkim_milter_t:s0 tclass=unix_stream_socket

Comment 8 errata-xmlrpc 2018-10-30 10:03:16 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3111