commit 2874e56c05a24fdf1641b42a56f6049eff6df2e0 · pyrox.dev/nixpkgs

+95 -19
nixos/modules/services/networking/sslh.nix
···

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       let

     

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         cfg = config.services.sslh;

     

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       +
         user = "sslh";

     

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         configFile = pkgs.writeText "sslh.conf" ''

     

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           verbose: ${boolToString cfg.verbose};

     

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           foreground: true;

     

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           inetd: false;

     

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           numeric: false;

     

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       -
           transparent: false;

     

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           transparent: ${boolToString cfg.transparent};

     

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           timeout: "${toString cfg.timeout}";

     

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           user: "nobody";

     

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           pidfile: "${cfg.pidfile}";

     

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           listen:

     

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           (

     
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               description = "Timeout in seconds.";

     

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             };

     

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       -
             pidfile = mkOption {

     

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               type = types.path;

     

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               default = "/run/sslh.pid";

     

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               description = "PID file path for sslh daemon.";

     

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             transparent = mkOption {

     

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               type = types.bool;

     

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               default = false;

     

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               description = "Will the services behind sslh (Apache, sshd and so on) see the external IP and ports as if the external world connected directly to them";

     

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             };

     

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             listenAddress = mkOption {

     

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               type = types.str;

     

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               default = config.networking.hostName;

     

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               description = "Listening hostname.";

     

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               default = "0.0.0.0";

     

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               description = "Listening address or hostname.";

     

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             };

     

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             port = mkOption {

     
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           };

     

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         };

     

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       -
         config = mkIf cfg.enable {

     

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           systemd.services.sslh = {

     

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             description = "Applicative Protocol Multiplexer (e.g. share SSH and HTTPS on the same port)";

     

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             after = [ "network.target" ];

     

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             wantedBy = [ "multi-user.target" ];

     

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             serviceConfig.ExecStart = "${pkgs.sslh}/bin/sslh -F${configFile}";

     

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             serviceConfig.KillMode = "process";

     

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             serviceConfig.PIDFile = "${cfg.pidfile}";

     

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           };

     

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         };

     

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         config = mkMerge [

     

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           (mkIf cfg.enable {

     

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             users.users.${user} = {

     

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               description = "sslh daemon user";

     

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               isSystemUser = true;

     

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             };

     

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             systemd.services.sslh = {

     

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               description = "Applicative Protocol Multiplexer (e.g. share SSH and HTTPS on the same port)";

     

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               after = [ "network.target" ];

     

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               wantedBy = [ "multi-user.target" ];

     

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               serviceConfig = {

     

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                 User                 = user;

     

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                 Group                = "nogroup";

     

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                 PermissionsStartOnly = true;

     

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                 Restart              = "always";

     

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                 RestartSec           = "1s";

     

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                 ExecStart            = "${pkgs.sslh}/bin/sslh -F${configFile}";

     

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                 KillMode             = "process";

     

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                 AmbientCapabilities  = "CAP_NET_BIND_SERVICE CAP_NET_ADMIN CAP_SETGID CAP_SETUID";

     

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                 PrivateTmp           = true;

     

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                 PrivateDevices       = true;

     

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                 ProtectSystem        = "full";

     

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                 ProtectHome          = true;

     

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               };

     

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             };

     

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           })

     

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           # code from https://github.com/yrutschle/sslh#transparent-proxy-support

     

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           # the only difference is using iptables mark 0x2 instead of 0x1 to avoid conflicts with nixos/nat module

     

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           (mkIf (cfg.enable && cfg.transparent) {

     

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             # Set route_localnet = 1 on all interfaces so that ssl can use "localhost" as destination

     

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             boot.kernel.sysctl."net.ipv4.conf.default.route_localnet" = 1;

     

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             boot.kernel.sysctl."net.ipv4.conf.all.route_localnet"     = 1;

     

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             systemd.services.sslh = let

     

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               iptablesCommands = [

     

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                 # DROP martian packets as they would have been if route_localnet was zero

     

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                 # Note: packets not leaving the server aren't affected by this, thus sslh will still work

     

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                 { table = "raw";    command = "PREROUTING  ! -i lo -d 127.0.0.0/8 -j DROP"; }

     

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                 { table = "mangle"; command = "POSTROUTING ! -o lo -s 127.0.0.0/8 -j DROP"; }

     

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                 # Mark all connections made by ssl for special treatment (here sslh is run as user ${user})

     

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                 { table = "nat";    command = "OUTPUT -m owner --uid-owner ${user} -p tcp --tcp-flags FIN,SYN,RST,ACK SYN -j CONNMARK --set-xmark 0x02/0x0f"; }

     

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                 # Outgoing packets that should go to sslh instead have to be rerouted, so mark them accordingly (copying over the connection mark)

     

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                 { table = "mangle"; command = "OUTPUT ! -o lo -p tcp -m connmark --mark 0x02/0x0f -j CONNMARK --restore-mark --mask 0x0f"; }

     

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               ];

     

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               ip6tablesCommands = [

     

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                 { table = "raw";    command = "PREROUTING  ! -i lo -d ::1/128     -j DROP"; }

     

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                 { table = "mangle"; command = "POSTROUTING ! -o lo -s ::1/128     -j DROP"; }

     

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                 { table = "nat";    command = "OUTPUT -m owner --uid-owner ${user} -p tcp --tcp-flags FIN,SYN,RST,ACK SYN -j CONNMARK --set-xmark 0x02/0x0f"; }

     

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                 { table = "mangle"; command = "OUTPUT ! -o lo -p tcp -m connmark --mark 0x02/0x0f -j CONNMARK --restore-mark --mask 0x0f"; }

     

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               ];

     

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             in {

     

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               path = [ pkgs.iptables pkgs.iproute pkgs.procps ];

     

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               preStart = ''

     

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                 # Cleanup old iptables entries which might be still there

     

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                 ${concatMapStringsSep "\n" ({table, command}: "while iptables -w -t ${table} -D ${command} 2>/dev/null; do echo; done") iptablesCommands}

     

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                 ${concatMapStringsSep "\n" ({table, command}:       "iptables -w -t ${table} -A ${command}"                           ) iptablesCommands}

     

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                 # Configure routing for those marked packets

     

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                 ip rule  add fwmark 0x2 lookup 100

     

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                 ip route add local 0.0.0.0/0 dev lo table 100

     

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               '' + optionalString config.networking.enableIPv6 ''

     

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                 ${concatMapStringsSep "\n" ({table, command}: "while ip6tables -w -t ${table} -D ${command} 2>/dev/null; do echo; done") ip6tablesCommands}

     

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                 ${concatMapStringsSep "\n" ({table, command}:       "ip6tables -w -t ${table} -A ${command}"                           ) ip6tablesCommands}

     

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                 ip -6 rule  add fwmark 0x2 lookup 100

     

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                 ip -6 route add local ::/0 dev lo table 100

     

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               '';

     

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               postStop = ''

     

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                 ${concatMapStringsSep "\n" ({table, command}: "iptables -w -t ${table} -D ${command}") iptablesCommands}

     

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                 ip rule  del fwmark 0x2 lookup 100

     

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                 ip route del local 0.0.0.0/0 dev lo table 100

     

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               '' + optionalString config.networking.enableIPv6 ''

     

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                 ${concatMapStringsSep "\n" ({table, command}: "ip6tables -w -t ${table} -D ${command}") ip6tablesCommands}

     

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                 ip -6 rule  del fwmark 0x2 lookup 100

     

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                 ip -6 route del local ::/0 dev lo table 100

     

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               '';

     

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             };

     

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           })

     

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         ];

     

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       }