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Block sandbox access to local network

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Add nftables forward rules to prevent sandboxed workspaces from
reaching RFC1918 private addresses while allowing public internet
and the host gateway (for DNS/NAT).
This commit is contained in:
Zuckerberg
2026-02-09 20:16:02 -08:00
parent d6a0e8ec49
commit 869b6af7f7
1 changed files with 10 additions and 0 deletions
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10
common/network/sandbox.nix
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@@ -112,5 +112,15 @@ in
allowedTCPPorts = [ 53 ]; allowedTCPPorts = [ 53 ];
allowedUDPPorts = [ 53 ]; allowedUDPPorts = [ 53 ];
}; };
# Block sandboxes from reaching the local network (private RFC1918 ranges)
# while still allowing public internet access via NAT.
# The sandbox subnet itself is allowed so workspaces can reach the host gateway.
networking.firewall.extraForwardRules = ''
iifname ${cfg.bridgeName} ip daddr ${cfg.hostAddress} accept
iifname ${cfg.bridgeName} ip daddr 10.0.0.0/8 drop
iifname ${cfg.bridgeName} ip daddr 172.16.0.0/12 drop
iifname ${cfg.bridgeName} ip daddr 192.168.0.0/16 drop
'';
}; };
} }