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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.
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
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