commit 4ef813c94ac4aec6433e5a352aa065454ee02948 · ptr.pet/nixos-cloud-resources

+12

firewall/provider/hetzner/app.nix

···

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       {pkgs, lib ? pkgs.lib, taggedPorts, id}: let

     

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         l = lib // (import ./rules.nix {inherit lib;});

     

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         firewallRules =

     

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           builtins.toFile

     

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           "hetzner-firewall-${toString id}-rules.json"

     

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           (builtins.toJSON (l.mkFirewallRuleset taggedPorts));

     

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       in pkgs.writers.writeNu "apply-hetzner" ''

     

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         let firewallId = ${toString id}

     

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         let rulesFile = "${firewallRules}"

     

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         ${l.fileContents ./app.nu}

     

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       ''

+9 -35

firewall/provider/hetzner/default.nix

···

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       {pkgs, lib, config, options, ...}: let

     

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       {lib, config, ...}: let

     

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         l = lib;

     

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         t = l.types;

     

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         taggedPorts = config.networking.firewall.public;

     
···

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               type = t.ints.unsigned;

     

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               description = "The ID of the firewall to update.";

     

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             };

     

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             app = l.mkOption {

     

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               type = t.package;

     

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             mkApp = l.mkOption {

     

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               type = t.functionTo t.package;

     

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               readOnly = true;

     

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               description = ''

     

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                 The generated app for this provider, run it to apply the configuration.

     

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                 Function that generates a script for this provider, pass it an instance of nixpkgs and run to apply the configuration.

     

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                 For this to work, you need to set the `HETZNER_API_TOKEN` environment variable to a valid API token from Hetzner.

     

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                 For this app to work, you need to set the `HETZNER_API_TOKEN` environment variable to a valid API token from Hetzner.

     

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               '';

     

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             };

     

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           };

     

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         };

     

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         config = let

     

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           mkRule = proto: tag: port: {

     

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             description = tag;

     

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             direction = "in";

     

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             protocol = proto;

     

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             port =

     

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               if l.isAttrs port

     

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               then l.concatMapStringsSep "-" toString [port.from port.to]

     

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               else toString port;

     

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             source_ips = ["0.0.0.0/0" "::/0"];

     

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           };

     

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           mkTcpRule = mkRule "tcp";

     

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           mkUdpRule = mkRule "udp";

     

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           firewallRules = pkgs.writers.writeJSON "hetzner-firewall-${toString cfg.id}-rules.json" {

     

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             rules = l.flatten (

     

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               l.mapAttrsToList

     

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               (tag: ports: [

     

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                 (l.map (mkTcpRule tag) ports.allowedTCPPorts)

     

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                 (l.map (mkTcpRule tag) ports.allowedTCPPortRanges)

     

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                 (l.map (mkUdpRule tag) ports.allowedUDPPorts)

     

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                 (l.map (mkUdpRule tag) ports.allowedUDPPortRanges)

     

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               ])

     

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               taggedPorts

     

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             );

     

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         config = {

     

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           providers.hetzner.firewall.mkApp = pkgs: import ./app.nix {

     

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             inherit pkgs lib taggedPorts;

     

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             inherit (cfg) id;

     

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           };

     

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         in {

     

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           providers.hetzner.firewall.app = pkgs.writers.writeNu "apply-hetzner" ''

     

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             let firewallId = ${toString cfg.id}

     

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             let rulesFile = "${firewallRules}"

     

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             ${l.fileContents ./app.nu}

     

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           '';

     

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         };

     

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       }

+29

firewall/provider/hetzner/rules.nix

···

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       {lib}: let

     

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         l = lib;

     

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         mkRule = proto: tag: port: {

     

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           description = tag;

     

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           direction = "in";

     

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           protocol = proto;

     

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           port =

     

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             if l.isAttrs port

     

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             then l.concatMapStringsSep "-" toString [port.from port.to]

     

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             else toString port;

     

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           source_ips = ["0.0.0.0/0" "::/0"];

     

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         };

     

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       in rec {

     

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         mkTcpRule = mkRule "tcp";

     

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         mkUdpRule = mkRule "udp";

     

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         # taggedPorts: attrset of {allowedTCPPorts, allowedTCPPortRanges, ...}

     

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         mkFirewallRuleset = taggedPorts: {

     

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           rules = l.flatten (

     

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             l.mapAttrsToList

     

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             (tag: ports: [

     

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               (l.map (mkTcpRule tag) (ports.allowedTCPPorts or []))

     

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               (l.map (mkTcpRule tag) (ports.allowedTCPPortRanges or []))

     

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               (l.map (mkUdpRule tag) (ports.allowedUDPPorts or []))

     

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               (l.map (mkUdpRule tag) (ports.allowedUDPPortRanges or []))

     

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             ])

     

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             taggedPorts

     

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           );

     

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         };

     

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       }

+27 -3

flake.nix

···

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         inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";

     

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         outputs = inp: {

     

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         outputs = inp: let

     

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           l = inp.nixpkgs.lib;

     

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           pkgsInstances =

     

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             l.genAttrs

     

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             ["x86_64-linux"]

     

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             (s: inp.nixpkgs.legacyPackages.${s});

     

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         in {

     

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           nixosModules = {

     

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             firewall = ./firewall/default.nix;

     

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             firewall-hetzner = ./firewall/provider/hetzner/default.nix;

     

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             firewall = ./firewall;

     

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             firewall-hetzner = ./firewall/provider/hetzner;

     

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           };

     

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           checks =

     

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             l.mapAttrs

     

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             (_: pkgs: {

     

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               firewall-hetzner-app = import ./firewall/provider/hetzner/app.nix {

     

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                 inherit pkgs;

     

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                 taggedPorts = {

     

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                   http.allowedTCPPorts = [80 443];

     

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                   ssh.allowedTCPPorts = [22];

     

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                   "bla bla" = {

     

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                     allowedUDPPortRanges = [{from = 1332; to = 8891;}];

     

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                     allowedTCPPorts = [101];

     

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                     allowedUDPPorts = [102];

     

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                   };

     

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                 };

     

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                 id = 1;

     

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               };

     

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             })

     

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             pkgsInstances;

     

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         };

     

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       }