Define new sets and vars for output to avoid multiple redifinition of
the dicts.
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@ -4,6 +4,9 @@
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### Features
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* Manage nftables service at startup.
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### Default Rules
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* Use more sets and vars definitions to avoid multiple rules.
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## v1.0
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### Features
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47
README.md
47
README.md
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@ -64,7 +64,7 @@ Each type of rules dictionaries will be merged and rules will be applied in the
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``` yml
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# rules
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nft_global_default_rules:
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000 state management:
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005 state management:
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- ct state established,related accept
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- ct state invalid drop
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nft_global_group_rules: {}
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@ -93,10 +93,10 @@ nft_output_default_rules:
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- jump global
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015 localhost:
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- oif lo accept
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040 dhcp:
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- udp sport bootpc udp dport bootps limit rate 6/minute accept
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050 domain:
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- udp dport domain ct state new accept
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200 output udp accepted:
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- udp dport @output_udp_accept ct state new accept
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210 output tcp accepted:
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- tcp dport @output_tcp_accept ct state new accept
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nft_output_group_rules: {}
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nft_output_host_rules: {}
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@ -106,12 +106,26 @@ nft_define_default:
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desc: 'broadcast and multicast'
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name: badcast_addr
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value: '{ 255.255.255.255, 224.0.0.1, 224.0.0.251 }'
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output udp accepted:
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name: output_udp_accept
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value: '{ domain, bootps, ntp }'
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output tcp accepted:
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name: output_tcp_accept
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value: '{ http, https }'
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nft_define_group: {}
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nft_define_host: {}
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# sets and maps
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nft_set_default:
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blackhole:
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- type ipv4_addr;
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- elements = $badcast_addr
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output_udp_accept:
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- type inet_service; flags interval;
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- elements = $output_udp_accept
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output_tcp_accept:
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- type inet_service; flags interval;
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- elements = $output_tcp_accept
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nft_set_group: {}
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nft_set_host: {}
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```
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@ -138,13 +152,25 @@ table ip firewall {
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}
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```
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And you get the same result by displaying the ruleset on the host : `$ nft list ruleset` :
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And you can get all rules and definitons by displaying the ruleset on the host : `$ nft list ruleset` :
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```
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table ip firewall {
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set blackhole {
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type ipv4_addr
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elements = { 255.255.255.255, 224.0.0.1, 224.0.0.251 }
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elements = { 255.255.255.255, 224.0.0.1, 224.0.0.251}
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}
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set output_tcp_accept {
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type inet_service
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flags interval
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elements = { http, https}
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}
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set output_udp_accept {
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type inet_service
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flags interval
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elements = { domain, bootps, ntp}
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}
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chain global {
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@ -155,9 +181,8 @@ table ip firewall {
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chain input {
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type filter hook input priority 0; policy drop;
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jump global
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ip daddr @blackhole counter packets 3 bytes 204 drop
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ip daddr @blackhole counter packets 0 bytes 0 drop
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iif "lo" accept
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udp sport bootps udp dport bootpc limit rate 6/minute accept
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tcp dport ssh ct state new counter packets 0 bytes 0 accept
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}
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@ -165,8 +190,8 @@ table ip firewall {
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type filter hook output priority 0; policy drop;
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jump global
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oif "lo" accept
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udp sport bootpc udp dport bootps limit rate 6/minute accept
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udp dport domain ct state new packets 0 bytes 0 accept
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udp dport @output_udp_accept ct state new accept
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tcp dport @output_tcp_accept ct state new accept
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}
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}
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```
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@ -19,7 +19,7 @@ nft_set_conf_content: 'etc/nftables.d/sets.nft.j2'
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# rules
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nft_global_default_rules:
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000 state management:
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005 state management:
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- ct state established,related accept
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- ct state invalid drop
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nft_global_group_rules: {}
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@ -48,10 +48,10 @@ nft_output_default_rules:
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- jump global
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015 localhost:
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- oif lo accept
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040 dhcp:
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- udp sport bootpc udp dport bootps limit rate 6/minute accept
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050 domain:
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- udp dport domain ct state new accept
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200 output udp accepted:
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- udp dport @output_udp_accept ct state new accept
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210 output tcp accepted:
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- tcp dport @output_tcp_accept ct state new accept
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nft_output_group_rules: {}
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nft_output_host_rules: {}
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@ -61,13 +61,26 @@ nft_define_default:
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desc: 'broadcast and multicast'
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name: badcast_addr
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value: '{ 255.255.255.255, 224.0.0.1, 224.0.0.251 }'
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output tcp accepted:
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name: output_tcp_accept
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value: '{ http, https }'
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output udp accepted:
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name: output_udp_accept
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value: '{ bootps, domain, ntp }'
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nft_define_group: {}
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nft_define_host: {}
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# sets and maps
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nft_set_default:
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blackhole:
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- type ipv4_addr;
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- elements = $badcast_addr
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output_tcp_accept:
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- type inet_service; flags interval;
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- elements = $output_tcp_accept
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output_udp_accept:
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- type inet_service; flags interval;
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- elements = $output_udp_accept
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nft_set_group: {}
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nft_set_host: {}
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