On Wed, 8 Aug 2018 12:59:09 +0000
James Pearson <james-p@xxxxxxxxxxxxxxxxxx> wrote:
> James Pearson wrote:
> >
> > I'm attempting to port an existing xinetd service from CentOS 6 to
> > something equivalent with systemd for CentOS 7
> >
> > The existing xinetd config uses the attributes 'only_from' to limit
> > connections from a limited set of remote hosts and 'banner_fail' to
> > print a suitable error message when access is denied
> >
> > However, I can't find suitable 'equivalents' with systemd
> > socket/service files on CentOS 7
> >
> > It appears later versions of systemd supports the option
> > IPAddressAllow= (which is what I think I need ?)
> >
> > Does anyone know how to limit the remote hosts that can connect to a
> > port with CentOS 7's systemd ?
> >
> > Also, how to implement the equivalent of 'banner_fail' ? (not
> > absolutely required, but nice to have)
>
> I managed to do what is needed by creating a simple ExecStartPre
> script that checks if the $REMOTE_ADDR env var is in a list of my
> 'only_from' IP addresses - and exits with zero if it is or exits with
> non-zero if not
>
> The non-zero status from the ExecStartPre script causes the whole
> service instance to fail
>
> The ExecStartPre script also writes my 'banner_fail' message to
> stdout when it fails - which is what I want
Thanks for taking time to tell us about the solution.
/Peter
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