selinux denial not appearing in logs

[Paul Howarth]

On Wed, 28 Dec 2011 18:04:30 -0500
Edward Ned Harvey <selinuxadmin at clevertrove.com> wrote:

> How can this happen?  It's getting denied, but not appearing in
> either the audit log or the messages file.  Running Centos 6 fully
> updated, php (drupal) inside of httpd tries to send mail via postfix
> (postdrop).  
> 
>  
> 
> When I have setenforce 0, the mail goes through.  No errors in any
> logs (audit.log, error_log, messages)
> 
> When I have setenforce 1, the mail gets blocked.  I get this message
> in httpd error_log:
> 
>                 sendmail: fatal: execvp /usr/sbin/postdrop: Permission
> denied
> 
> sendmail: warning: command "/usr/sbin/postdrop -r" exited with status
> 1
> 
> sendmail: fatal: email at example.com(48): unable to
> execute /usr/sbin/postdrop -r: Success
> 
>  
> 
> I have auditd running.  In fact, I regularly use audit2allow to
> create allow policies on this machine.  So I can confidently say
> normally my selinux denials get logged in the audit.log.  I am at a
> loss to think of any reason this particular failure is not getting
> logged the same way my other error messages usually get logged.
> 
>  
> 
> I believe I can write a custom allow script by hand, but I believe I
> probably shouldn't, or if I try, it will fail for some reason.  
> 
>  
> 
> Thanks for your help...

The denials you're getting are probably being dontaudit-ed. See:

http://danwalsh.livejournal.com/11673.html

Paul.