On 17/04/18 20:12, Chris Adams wrote: > I am trying to get a handle on firewalld... I can't actually see right > off how to limit access to services to certain sources. For example, on > a single-interface server, I want to limit access to SSH and SNMP to > some "management" networks. With iptables, I might have: > > *filter > :INPUT ACCEPT [0:0] > :FORWARD ACCEPT [0:0] > :OUTPUT ACCEPT [0:0] > :mgmt - [0:0] > > -A INPUT -i lo -j ACCEPT > -A INPUT -p tcp --syn --dport http -j ACCEPT > -A INPUT -p tcp --syn --dport ssh -j mgmt > -A INPUT -p udp --dport snmp -j mgmt > > -A mgmt -s 10.0.0.0/24 -j ACCEPT > -A mgmt -s 10.1.0.0/24 -j ACCEPT > -A mgmt -p tcp -j REJECT --reject-with tcp-reset > -A mgmt -j DROP > > That means a couple of subnets can reach whatever management services I > declare, the rest of the network cannot, and HTTP is just wide open. > > I set a bunch of different documents talking about assigning interfaces > and services to zones, but nothing that tells me how to use those zones > to do something useful. > Here's how I'd set up limited access to SSH and SNMP
firewall-cmd --permanent --add-source=10.0.0.0/24 --zone=trusted firewall-cmd --permanent --add-source=10.1.0.0/24 --zone=trusted firewall-cmd --permanent --zone=trusted --add-service=ssh --add-service=snmp firewall-cmd --permanent --zone=public --remove-service=ssh --remove-service=snmp firewall-cmd --reload The 'zone=public' bit, that's my internet facing zone, to figure out which zones are allowing what, run firewall-cmd --list-all-zones and adjust the commands I posted accordingly to add / remove anything Hope this helps _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org
