commit 2874e56c05a24fdf1641b42a56f6049eff6df2e0 · pyrox.dev/nixpkgs

+95 -19

nixos/modules/services/networking/sslh.nix

···

       4
        
       

     

       5
        
       let

     

       6
        
         cfg = config.services.sslh;

     

       0
        
       
     

       7
        
         configFile = pkgs.writeText "sslh.conf" ''

     

       8
        
           verbose: ${boolToString cfg.verbose};

     

       9
        
           foreground: true;

     

       10
        
           inetd: false;

     

       11
        
           numeric: false;

     

       12
       -
           transparent: false;

     

       13
        
           timeout: "${toString cfg.timeout}";

     

       14
       -
           user: "nobody";

     

       15
       -
           pidfile: "${cfg.pidfile}";

     

       16
        
       

     

       17
        
           listen:

     

       18
        
           (

     
···

       50
        
               description = "Timeout in seconds.";

     

       51
        
             };

     

       52
        
       

     

       53
       -
             pidfile = mkOption {

     

       54
       -
               type = types.path;

     

       55
       -
               default = "/run/sslh.pid";

     

       56
       -
               description = "PID file path for sslh daemon.";

     

       57
        
             };

     

       58
        
       

     

       59
        
             listenAddress = mkOption {

     

       60
        
               type = types.str;

     

       61
       -
               default = config.networking.hostName;

     

       62
       -
               description = "Listening hostname.";

     

       63
        
             };

     

       64
        
       

     

       65
        
             port = mkOption {

     
···

       76
        
           };

     

       77
        
         };

     

       78
        
       

     

       79
       -
         config = mkIf cfg.enable {

     

       80
       -
           systemd.services.sslh = {

     

       81
       -
             description = "Applicative Protocol Multiplexer (e.g. share SSH and HTTPS on the same port)";

     

       82
       -
             after = [ "network.target" ];

     

       83
       -
             wantedBy = [ "multi-user.target" ];

     

       84
       -
             serviceConfig.ExecStart = "${pkgs.sslh}/bin/sslh -F${configFile}";

     

       85
       -
             serviceConfig.KillMode = "process";

     

       86
       -
             serviceConfig.PIDFile = "${cfg.pidfile}";

     

       87
       -
           };

     

       88
       -
         };

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       89
        
       }

···

       4
        
       

     

       5
        
       let

     

       6
        
         cfg = config.services.sslh;

     

       7
       +
         user = "sslh";

     

       8
        
         configFile = pkgs.writeText "sslh.conf" ''

     

       9
        
           verbose: ${boolToString cfg.verbose};

     

       10
        
           foreground: true;

     

       11
        
           inetd: false;

     

       12
        
           numeric: false;

     

       13
       +
           transparent: ${boolToString cfg.transparent};

     

       14
        
           timeout: "${toString cfg.timeout}";

     

       0
        
       
     

       0
        
       
     

       15
        
       

     

       16
        
           listen:

     

       17
        
           (

     
···

       49
        
               description = "Timeout in seconds.";

     

       50
        
             };

     

       51
        
       

     

       52
       +
             transparent = mkOption {

     

       53
       +
               type = types.bool;

     

       54
       +
               default = false;

     

       55
       +
               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";

     

       56
        
             };

     

       57
        
       

     

       58
        
             listenAddress = mkOption {

     

       59
        
               type = types.str;

     

       60
       +
               default = "0.0.0.0";

     

       61
       +
               description = "Listening address or hostname.";

     

       62
        
             };

     

       63
        
       

     

       64
        
             port = mkOption {

     
···

       75
        
           };

     

       76
        
         };

     

       77
        
       

     

       78
       +
         config = mkMerge [

     

       79
       +
           (mkIf cfg.enable {

     

       80
       +
             users.users.${user} = {

     

       81
       +
               description = "sslh daemon user";

     

       82
       +
               isSystemUser = true;

     

       83
       +
             };

     

       84
       +
       

     

       85
       +
             systemd.services.sslh = {

     

       86
       +
               description = "Applicative Protocol Multiplexer (e.g. share SSH and HTTPS on the same port)";

     

       87
       +
               after = [ "network.target" ];

     

       88
       +
               wantedBy = [ "multi-user.target" ];

     

       89
       +
       

     

       90
       +
               serviceConfig = {

     

       91
       +
                 User                 = user;

     

       92
       +
                 Group                = "nogroup";

     

       93
       +
                 PermissionsStartOnly = true;

     

       94
       +
                 Restart              = "always";

     

       95
       +
                 RestartSec           = "1s";

     

       96
       +
                 ExecStart            = "${pkgs.sslh}/bin/sslh -F${configFile}";

     

       97
       +
                 KillMode             = "process";

     

       98
       +
                 AmbientCapabilities  = "CAP_NET_BIND_SERVICE CAP_NET_ADMIN CAP_SETGID CAP_SETUID";

     

       99
       +
                 PrivateTmp           = true;

     

       100
       +
                 PrivateDevices       = true;

     

       101
       +
                 ProtectSystem        = "full";

     

       102
       +
                 ProtectHome          = true;

     

       103
       +
               };

     

       104
       +
             };

     

       105
       +
           })

     

       106
       +
       

     

       107
       +
           # code from https://github.com/yrutschle/sslh#transparent-proxy-support

     

       108
       +
           # the only difference is using iptables mark 0x2 instead of 0x1 to avoid conflicts with nixos/nat module

     

       109
       +
           (mkIf (cfg.enable && cfg.transparent) {

     

       110
       +
             # Set route_localnet = 1 on all interfaces so that ssl can use "localhost" as destination

     

       111
       +
             boot.kernel.sysctl."net.ipv4.conf.default.route_localnet" = 1;

     

       112
       +
             boot.kernel.sysctl."net.ipv4.conf.all.route_localnet"     = 1;

     

       113
       +
       

     

       114
       +
             systemd.services.sslh = let

     

       115
       +
               iptablesCommands = [

     

       116
       +
                 # DROP martian packets as they would have been if route_localnet was zero

     

       117
       +
                 # Note: packets not leaving the server aren't affected by this, thus sslh will still work

     

       118
       +
                 { table = "raw";    command = "PREROUTING  ! -i lo -d 127.0.0.0/8 -j DROP"; }

     

       119
       +
                 { table = "mangle"; command = "POSTROUTING ! -o lo -s 127.0.0.0/8 -j DROP"; }

     

       120
       +
                 # Mark all connections made by ssl for special treatment (here sslh is run as user ${user})

     

       121
       +
                 { table = "nat";    command = "OUTPUT -m owner --uid-owner ${user} -p tcp --tcp-flags FIN,SYN,RST,ACK SYN -j CONNMARK --set-xmark 0x02/0x0f"; }

     

       122
       +
                 # Outgoing packets that should go to sslh instead have to be rerouted, so mark them accordingly (copying over the connection mark)

     

       123
       +
                 { table = "mangle"; command = "OUTPUT ! -o lo -p tcp -m connmark --mark 0x02/0x0f -j CONNMARK --restore-mark --mask 0x0f"; }

     

       124
       +
               ];

     

       125
       +
               ip6tablesCommands = [

     

       126
       +
                 { table = "raw";    command = "PREROUTING  ! -i lo -d ::1/128     -j DROP"; }

     

       127
       +
                 { table = "mangle"; command = "POSTROUTING ! -o lo -s ::1/128     -j DROP"; }

     

       128
       +
                 { table = "nat";    command = "OUTPUT -m owner --uid-owner ${user} -p tcp --tcp-flags FIN,SYN,RST,ACK SYN -j CONNMARK --set-xmark 0x02/0x0f"; }

     

       129
       +
                 { table = "mangle"; command = "OUTPUT ! -o lo -p tcp -m connmark --mark 0x02/0x0f -j CONNMARK --restore-mark --mask 0x0f"; }

     

       130
       +
               ];

     

       131
       +
             in {

     

       132
       +
               path = [ pkgs.iptables pkgs.iproute pkgs.procps ];

     

       133
       +
       

     

       134
       +
               preStart = ''

     

       135
       +
                 # Cleanup old iptables entries which might be still there

     

       136
       +
                 ${concatMapStringsSep "\n" ({table, command}: "while iptables -w -t ${table} -D ${command} 2>/dev/null; do echo; done") iptablesCommands}

     

       137
       +
                 ${concatMapStringsSep "\n" ({table, command}:       "iptables -w -t ${table} -A ${command}"                           ) iptablesCommands}

     

       138
       +
       

     

       139
       +
                 # Configure routing for those marked packets

     

       140
       +
                 ip rule  add fwmark 0x2 lookup 100

     

       141
       +
                 ip route add local 0.0.0.0/0 dev lo table 100

     

       142
       +
       

     

       143
       +
               '' + optionalString config.networking.enableIPv6 ''

     

       144
       +
                 ${concatMapStringsSep "\n" ({table, command}: "while ip6tables -w -t ${table} -D ${command} 2>/dev/null; do echo; done") ip6tablesCommands}

     

       145
       +
                 ${concatMapStringsSep "\n" ({table, command}:       "ip6tables -w -t ${table} -A ${command}"                           ) ip6tablesCommands}

     

       146
       +
       

     

       147
       +
                 ip -6 rule  add fwmark 0x2 lookup 100

     

       148
       +
                 ip -6 route add local ::/0 dev lo table 100

     

       149
       +
               '';

     

       150
       +
       

     

       151
       +
               postStop = ''

     

       152
       +
                 ${concatMapStringsSep "\n" ({table, command}: "iptables -w -t ${table} -D ${command}") iptablesCommands}

     

       153
       +
       

     

       154
       +
                 ip rule  del fwmark 0x2 lookup 100

     

       155
       +
                 ip route del local 0.0.0.0/0 dev lo table 100

     

       156
       +
               '' + optionalString config.networking.enableIPv6 ''

     

       157
       +
                 ${concatMapStringsSep "\n" ({table, command}: "ip6tables -w -t ${table} -D ${command}") ip6tablesCommands}

     

       158
       +
       

     

       159
       +
                 ip -6 rule  del fwmark 0x2 lookup 100

     

       160
       +
                 ip -6 route del local ::/0 dev lo table 100

     

       161
       +
               '';

     

       162
       +
             };

     

       163
       +
           })

     

       164
       +
         ];

     

       165
        
       }