nixos-module/container/upstream: prohibit forwarding smtp except for serv
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@ -57,10 +57,24 @@ in
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internalInterfaces = [ "core" ];
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externalInterface = firstUpstreamInterface;
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externalIP = upstreamInterfaces.${firstUpstreamInterface}.upstream.staticIpv4Address;
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extraCommands =
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extraCommands = ''
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# Prohibit SMTP except for servers
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iptables -N fwd_smtp
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iptables -A fwd_smtp --source ${config.site.net.serv.subnet4} -j RETURN
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iptables -A fwd_smtp -j REJECT
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iptables -I FORWARD -p tcp --dport 25 -j fwd_smtp
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ip6tables -N fwd_smtp
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${lib.concatMapStrings (subnet6: ''
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ip6tables -A fwd_smtp --source ${subnet6} -j RETURN
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ip6tables -A fwd_smtp --dest ${subnet6} -j RETURN
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'') (builtins.attrValues config.site.net.serv.subnets6)}
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ip6tables -A fwd_smtp -j REJECT
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ip6tables -I FORWARD -p tcp --dport 25 -j fwd_smtp
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# Provide IPv6 upstream for everyone, using NAT66 when not from
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# our static prefixes
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lib.concatMapStringsSep "\n" (net: ''
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${lib.concatMapStringsSep "\n" (net: ''
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ip6tables -t nat -N ${net}_nat || \
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ip6tables -t nat -F ${net}_nat
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${lib.concatMapStringsSep "\n" (subnet: ''
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@ -73,13 +87,18 @@ in
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ip6tables -t nat -A POSTROUTING \
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-o ${net} \
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-j ${net}_nat
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'') (builtins.attrNames upstreamInterfaces);
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extraStopCommands =
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lib.concatMapStringsSep "\n" (net: ''
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'') (builtins.attrNames upstreamInterfaces)}
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'';
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extraStopCommands = ''
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iptables -F FORWARD 2>/dev/null || true
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ip6tables -F FORWARD 2>/dev/null || true
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ip6tables -t nat -F POSTROUTING 2>/dev/null || true
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${lib.concatMapStringsSep "\n" (net: ''
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ip6tables -t nat -F ${net}_nat 2>/dev/null || true
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ip6tables -t nat -X ${net}_nat 2>/dev/null || true
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'') (builtins.attrNames upstreamInterfaces);
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'') (builtins.attrNames upstreamInterfaces)}
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'';
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forwardPorts = map ({ destination, sourcePort, reflect, ... }@forwardedPort:
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removeAttrs forwardedPort ["reflect"] // {
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