Greetings -
I recently had some brief intermittent network connection issues that I
finally tracked down to occurring in time with dns lease renewal by
dnsmasq. Looking into the logs I found that the issue began after I
rebooted my dns server recently. No configuration changes had been
made, we shut servers down for a planned power outage for our building.
I have read the full sealert message, but with my limited experience I
am looking for some confirmation before making any changes. The raw
audit message is listed below. It appears there may be a context issue
on the log file (I know there is a typo in my log file name).
Raw Audit Messages
type=AVC msg=audit(1559298063.86:81599): avc: denied { setattr } for
pid=15072 comm="dnsmasq" name="dsnmasq.log" dev=vda2 ino=1068
scontext=system_u:system_r:dnsmasq_t:s0
tcontext=system_u:object_r:var_log_t:s0 tclass=file
type=SYSCALL msg=audit(1559298063.86:81599): arch=x86_64 syscall=fchown
success=no exit=EACCES a0=c a1=63 a2=ffffffff a3=418 items=0 ppid=1
pid=15072 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0
tty=(none) ses=13562 comm=dnsmasq exe=/usr/sbin/dnsmasq
subj=system_u:system_r:dnsmasq_t:s0 key=(null)
Running audit2why gives the following, which references a missing type
enforcement allow rule.
type=AVC msg=audit(1558865403.590:67806): avc: denied { setattr } for
pid=1429 comm="dnsmasq" name="dsnmasq.log" dev=vda2 ino=827
scontext=system_u:system_r:dnsmasq_t:s0
tcontext=system_u:object_r:var_log_t:s0 tclass=file
Was caused by:
Missing type enforcement (TE) allow rule.
You can use audit2allow to generate a loadable module
to allow this access.
However, when I run matchpathcon, I get the following results, which
seems to indicate that everything should be ok.
[root@taxa ~]# matchpathcon -V /var/log/*
/var/log/dsnmasq.log verified.
/var/log/dsnmasq.log-20190525 verified.
/var/log/dsnmasq.log-20190526 verified.
/var/log/dsnmasq.log-20190527 verified.
/var/log/dsnmasq.log-20190528 verified.
/var/log/dsnmasq.log-20190529 verified.
/var/log/dsnmasq.log-20190530 verified.
/var/log/dsnmasq.log-20190531 verified.
So it is not clear to me what is the proper way to resolve this denial,
and am looking for a little more education and advice so that I don't
issue the wrong selinux command. I am running dnsmasq 2.48-18.el6_9 on
a CentOS 6 system. Thanks.
Jeff
--
Jeff Boyce
Meridian Environmental
