Following the most recent kernel updates I restarted our outgoing SMTP MTA which was recently reconfigured to DKIM sign messages using OpenDKIM. This morning I discovered that Postfix had stopped on that server. Whether it is related to the Postfix issue or not is yet to be determined but, in the process of getting things restarted I ran across this error with Open DKIM:
# service opendkim restart Stopping OpenDKIM Milter: [FAILED] Starting OpenDKIM Milter: opendkim: /etc/opendkim.conf: refile:/etc/opendkim/TrustedHosts: dkimf_db_open(): Permission denied [FAILED]
I check the permissions and ownership on the file and everything seems normal. I then checked audit2why and got this:
audit2allow: error: no such option: -- [root@inet08 opendkim]# audit2why -l -a type=AVC msg=audit(1399898848.286:2317): avc: denied { dac_read_search } for pid=15213 comm="opendkim" capability=2 scontext=unconfined_u:system_r:dkim_milter_t:s0 tcontext=unconfined_u:system_r:dkim_milter_t:s0 tclass=capability Was caused by: Missing type enforcement (TE) allow rule.
You can use audit2allow to generate a loadable module to allow this access.
type=AVC msg=audit(1399898848.286:2317): avc: denied { dac_override } for pid=15213 comm="opendkim" capability=1 scontext=unconfined_u:system_r:dkim_milter_t:s0 tcontext=unconfined_u:system_r:dkim_milter_t:s0 tclass=capability Was caused by: Missing type enforcement (TE) allow rule.
You can use audit2allow to generate a loadable module to allow this access.
We have been using dkim for a little while now and our dmarc records indicate that messages from our domains should be signed so this problem needed an immediate fix or workaround. What I ended up with was this .te file that generates an SEModule which at least gets the service running. What else it opens us up to I am not sure so I would appreciate some commentary on how I should proceed to obtain a permanent fix:
module localOpenDKIMmod 1.0;
require { type dkim_milter_t; class capability { dac_read_search dac_override }; }
#============= dkim_milter_t ============== allow dkim_milter_t self:capability { dac_read_search dac_override };