New zone with ip range and drop all other

[Eric Garver]

On Sat, Oct 06, 2018 at 06:14:22PM -0400, Igor Kapushkin wrote:
> Hello
>     
>    I want to create new zone to allow only SSH connections from IP address
>    range and DROP everything else.
>
>    <?xml version="1.0" encoding="utf-8"?>
>
>    <zone target="DROP">
>      <short>TEsting</short>
>      <description>Testing</description>
>      <service name="ssh"/>
>      <source address="123.45.67.89/24" />
>    </zone>
>     
>    That IP range is fake, of course. In the real one, I use my IP range,
>    which is real.
>     
>    I place that inside /etc/firewalld/zones/testing.xml and the zone gets
>    listed after reload. The prblem is that ssh is still open for everyone. If
>    I run nmap from a computer outside that range ("123.45.67.89/24") it says
>    "open" so firewalld is not blocking it.
>     
>    What am I doing wrong? Should I use "ACCEPT" instead of "DROP"?

It's because packets not from 123.45.67.89/24 belong to a different zone
(likely the default/public zone) which also has SSH opened.

https://firewalld.org/documentation/zone/default-zone.html

You can get the desired effect by changing the default zone to something
restrictive like the "block" zone. Then your custom "testing" zone will
handle SSH connections from 123.45.67.89/24.

# firewall-cmd --set-default-zone=block
  # firewall-cmd --reload

Be careful doing this remotely as you can easily block yourself out from
SSH.