Recently, I got iptables settings that seem to harden server.
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iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED ACCEPT all -- anywhere anywhere INPUT_direct all -- anywhere anywhere INPUT_ZONES_SOURCE all -- anywhere anywhere INPUT_ZONES all -- anywhere anywhere DROP all -- anywhere anywhere ctstate INVALID REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED ACCEPT all -- anywhere anywhere FORWARD_direct all -- anywhere anywhere FORWARD_IN_ZONES_SOURCE all -- anywhere anywhere FORWARD_IN_ZONES all -- anywhere anywhere FORWARD_OUT_ZONES_SOURCE all -- anywhere anywhere FORWARD_OUT_ZONES all -- anywhere anywhere DROP all -- anywhere anywhere ctstate INVALID REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT) target prot opt source destination OUTPUT_direct all -- anywhere anywhere Chain FORWARD_IN_ZONES (1 references) target prot opt source destination FWDI_public all -- anywhere anywhere [goto] FWDI_public all -- anywhere anywhere [goto] Chain FORWARD_IN_ZONES_SOURCE (1 references) target prot opt source destination Chain FORWARD_OUT_ZONES (1 references) target prot opt source destination FWDO_public all -- anywhere anywhere [goto] FWDO_public all -- anywhere anywhere [goto] Chain FORWARD_OUT_ZONES_SOURCE (1 references) target prot opt source destination Chain FORWARD_direct (1 references) target prot opt source destination Chain FWDI_public (2 references) target prot opt source destination FWDI_public_log all -- anywhere anywhere FWDI_public_deny all -- anywhere anywhere FWDI_public_allow all -- anywhere anywhere ACCEPT icmp -- anywhere anywhere Chain FWDI_public_allow (1 references) target prot opt source destination Chain FWDI_public_deny (1 references) target prot opt source destination Chain FWDI_public_log (1 references) target prot opt source destination Chain FWDO_public (2 references) target prot opt source destination FWDO_public_log all -- anywhere anywhere FWDO_public_deny all -- anywhere anywhere FWDO_public_allow all -- anywhere anywhere Chain FWDO_public_allow (1 references) target prot opt source destination Chain FWDO_public_deny (1 references) target prot opt source destination Chain FWDO_public_log (1 references) target prot opt source destination Chain INPUT_ZONES (1 references) target prot opt source destination IN_public all -- anywhere anywhere [goto] IN_public all -- anywhere anywhere [goto] Chain INPUT_ZONES_SOURCE (1 references) target prot opt source destination Chain INPUT_direct (1 references) target prot opt source destination Chain IN_public (2 references) target prot opt source destination IN_public_log all -- anywhere anywhere IN_public_deny all -- anywhere anywhere IN_public_allow all -- anywhere anywhere ACCEPT icmp -- anywhere anywhere Chain IN_public_allow (1 references) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:ssh ctstate NEW Chain IN_public_deny (1 references) target prot opt source destination Chain IN_public_log (1 references) target prot opt source destination Chain OUTPUT_direct (1 references) target prot opt source destination |
This comes from a newly-provisioned vps. The iptables block all ports of the server except the ssh port(22). If you change the ssh port from the default 22…