SELINUX_ERR about sendmail (postfix version) on F-13

[Laurent Rineau]

For a few days (maybe two weeks), my cron deamon keeps sending me error emails, once a day:
> /etc/cron.daily/0logwatch:
> 
> Can't exec "/usr/sbin/sendmail": Permission denied at /usr/sbin/logwatch line 1032, <TESTFILE> line 2.
> Can't execute /usr/sbin/sendmail -t: Permission denied
 
I have suspected SELinux, but the setroubleshot stuff did not say anything. And I eventually found that:

lrineau at matisse ~ $ sudo ausearch -ts yesterday -m SELINUX_ERR
----
time->Tue Aug  3 03:16:04 2010
type=SYSCALL msg=audit(1280798164.966:454): arch=c000003e syscall=59 success=no exit=-13 a0=1dfe430 a1=1dfe3c0 a2=1e01240 a3=8 items=0 ppid=17968 pid=18278 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 
fsgid=0 tty=(none) ses=31 comm="logwatch" exe="/usr/bin/perl" subj=system_u:system_r:logwatch_t:s0-s0:c0.c1023 key=(null)
type=SELINUX_ERR msg=audit(1280798164.966:454): security_compute_sid:  invalid context system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023 for scontext=system_u:system_r:logwatch_t:s0-s0:c0.c1023 
tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=process
----
time->Wed Aug  4 03:19:04 2010
type=SYSCALL msg=audit(1280884744.246:135): arch=c000003e syscall=59 success=no exit=-13 a0=187b190 a1=187b120 a2=187ac30 a3=7ffff2dc3ec0 items=0 ppid=14696 pid=15085 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 
egid=0 sgid=0 fsgid=0 tty=(none) ses=21 comm="logwatch" exe="/usr/bin/perl" subj=system_u:system_r:logwatch_t:s0-s0:c0.c1023 key=(null)
type=SELINUX_ERR msg=audit(1280884744.246:135): security_compute_sid:  invalid context system_u:system_r:logwatch_mail_t:s0-s0:c0.c1023 for scontext=system_u:system_r:logwatch_t:s0-s0:c0.c1023 
tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=process

I did not know about SELINUX_ERR before that error. Maybe setroubleshotd should be aware of it, so that one can report bugs about SELINUX_ERR easily with the applet.

My configuration is this one:

lrineau at matisse ~ $ rpm -qa postfix selinux\*               
selinux-policy-3.7.19-39.fc13.noarch
selinux-policy-targeted-3.7.19-39.fc13.noarch
postfix-2.7.0-1.fc13.x86_64

logwatch and postfix are configured with the default configurations, tweak only the simpliest way.

-- 
Laurent Rineau
http://fedoraproject.org/wiki/LaurentRineau