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author | Gregor Kleen <gkleen@yggdrasil.li> | 2021-12-08 17:59:52 +0100 |
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committer | Gregor Kleen <gkleen@yggdrasil.li> | 2021-12-08 17:59:52 +0100 |
commit | 8124337c5182b02e3057ebde1213050d4a714a0f (patch) | |
tree | 75ca0a216c5bacefdff73640f1ec86e6a3f85dd9 | |
parent | fb7cd0220c908408910d26b9823acef9fe2b39e2 (diff) | |
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vidhar: nftables...
-rw-r--r-- | hosts/vidhar/default.nix | 50 | ||||
-rw-r--r-- | hosts/vidhar/ruleset.nft | 71 | ||||
-rw-r--r-- | shell.nix | 1 |
3 files changed, 75 insertions, 47 deletions
diff --git a/hosts/vidhar/default.nix b/hosts/vidhar/default.nix index 622c2c54..e05b9416 100644 --- a/hosts/vidhar/default.nix +++ b/hosts/vidhar/default.nix | |||
@@ -78,54 +78,10 @@ | |||
78 | ]; | 78 | ]; |
79 | }; | 79 | }; |
80 | 80 | ||
81 | firewall = { | 81 | firewall.enable = false; |
82 | nftables = { | ||
82 | enable = true; | 83 | enable = true; |
83 | package = pkgs.iptables-nftables-compat; | 84 | rulesetFile = ./ruleset.nft; |
84 | allowPing = true; | ||
85 | allowedTCPPorts = [ | ||
86 | 22 # ssh | ||
87 | ]; | ||
88 | allowedUDPPorts = [ | ||
89 | 51820 # wireguard | ||
90 | ]; | ||
91 | allowedUDPPortRanges = [ | ||
92 | { from = 60000; to = 61000; } # mosh | ||
93 | ]; | ||
94 | extraCommands = '' | ||
95 | ip46tables -D FORWARD -j nixos-fw-forward 2>/dev/null || true | ||
96 | ip46tables -F nixos-fw-forward 2>/dev/null || true | ||
97 | ip46tables -X nixos-fw-forward 2>/dev/null || true | ||
98 | ip46tables -N nixos-fw-forward | ||
99 | |||
100 | ip46tables -A nixos-fw-forward -i eno1 -j ACCEPT | ||
101 | ip46tables -A nixos-fw-forward -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT | ||
102 | ip6tables -A nixos-fw-forward -p icmpv6 --icmpv6-type redirect -j nixos-fw-log-refuse | ||
103 | ip6tables -A nixos-fw-forward -p icmpv6 --icmpv6-type 139 -j nixos-fw-log-refuse | ||
104 | ip6tables -A nixos-fw-forward -p icmpv6 -j ACCEPT | ||
105 | |||
106 | ip46tables -A nixos-fw-forward -j nixos-fw-log-refuse | ||
107 | ip46tables -A FORWARD -j nixos-fw-forward | ||
108 | |||
109 | |||
110 | ip46tables -t nat -D POSTROUTING -j nixos-fw-postrouting 2>/dev/null || true | ||
111 | ip46tables -t nat -F nixos-fw-postrouting 2>/dev/null || true | ||
112 | ip46tables -t nat -X nixos-fw-postrouting 2>/dev/null || true | ||
113 | ip46tables -t nat -N nixos-fw-postrouting | ||
114 | |||
115 | iptables -t nat -A nixos-fw-postrouting -o dsl -j MASQUERADE | ||
116 | |||
117 | ip46tables -t nat -A POSTROUTING -j nixos-fw-postrouting | ||
118 | |||
119 | |||
120 | ip46tables -t mangle -D POSTROUTING -j nixos-fw-postrouting 2>/dev/null || true | ||
121 | ip46tables -t mangle -F nixos-fw-postrouting 2>/dev/null || true | ||
122 | ip46tables -t mangle -X nixos-fw-postrouting 2>/dev/null || true | ||
123 | |||
124 | ip46tables -t mangle -N nixos-fw-postrouting | ||
125 | ip46tables -t mangle -A nixos-fw-postrouting -o dsl -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu | ||
126 | |||
127 | ip46tables -t mangle -A POSTROUTING -j nixos-fw-postrouting | ||
128 | ''; | ||
129 | }; | 85 | }; |
130 | }; | 86 | }; |
131 | 87 | ||
diff --git a/hosts/vidhar/ruleset.nft b/hosts/vidhar/ruleset.nft new file mode 100644 index 00000000..ae91af00 --- /dev/null +++ b/hosts/vidhar/ruleset.nft | |||
@@ -0,0 +1,71 @@ | |||
1 | table inet filter { | ||
2 | chain forward { | ||
3 | type filter hook forward priority filter | ||
4 | policy drop | ||
5 | |||
6 | |||
7 | iifname eno1 accept | ||
8 | |||
9 | ct state {established, related} accept | ||
10 | |||
11 | meta l4proto ipv6-icmp accept | ||
12 | meta l4proto icmp accept | ||
13 | meta l4proto igmp accept | ||
14 | |||
15 | |||
16 | log prefix "drop forward:" | ||
17 | counter | ||
18 | } | ||
19 | |||
20 | chain input { | ||
21 | type filter hook input priority filter | ||
22 | policy drop | ||
23 | |||
24 | |||
25 | iifname lo accept | ||
26 | iif != lo ip daddr 127.0.0.1/8 counter drop | ||
27 | iif != lo ip6 daddr ::1/128 counter drop | ||
28 | |||
29 | ct state {established, related} accept | ||
30 | |||
31 | tcp dport 22 accept | ||
32 | udp dport 51820 accept | ||
33 | udp dport 60000-61000 accept | ||
34 | |||
35 | meta l4proto ipv6-icmp accept | ||
36 | meta l4proto icmp accept | ||
37 | meta l4proto igmp accept | ||
38 | |||
39 | log prefix "drop input:" | ||
40 | counter | ||
41 | } | ||
42 | |||
43 | chain output { | ||
44 | type filter hook output priority filter | ||
45 | policy accept | ||
46 | |||
47 | counter | ||
48 | } | ||
49 | } | ||
50 | |||
51 | table ip nat { | ||
52 | chain postrouting { | ||
53 | type nat hook postrouting priority srcnat | ||
54 | policy accept | ||
55 | |||
56 | oifname dsl counter masquerade | ||
57 | |||
58 | counter | ||
59 | } | ||
60 | } | ||
61 | |||
62 | table inet mangle { | ||
63 | chain postrouting { | ||
64 | type filter hook postrouting priority mangle | ||
65 | policy accept | ||
66 | |||
67 | oifname dsl meta l4proto tcp tcp flags & (syn|rst) == syn counter tcp option maxseg size set rt mtu | ||
68 | |||
69 | counter | ||
70 | } | ||
71 | } \ No newline at end of file | ||
@@ -15,5 +15,6 @@ in pkgs.mkShell { | |||
15 | sops | 15 | sops |
16 | wireguard | 16 | wireguard |
17 | gup | 17 | gup |
18 | nftables | ||
18 | ]; | 19 | ]; |
19 | } | 20 | } |