284 lines
8.4 KiB
Nix
284 lines
8.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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pkg = pkgs.cjdns;
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cfg = config.services.cjdns;
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connectToSubmodule =
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{ ... }:
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{ options =
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{ password = mkOption {
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type = types.str;
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description = "Authorized password to the opposite end of the tunnel.";
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};
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publicKey = mkOption {
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type = types.str;
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description = "Public key at the opposite end of the tunnel.";
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};
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hostname = mkOption {
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default = "";
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example = "foobar.hype";
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type = types.str;
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description = "Optional hostname to add to /etc/hosts; prevents reverse lookup failures.";
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};
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};
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};
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# Additional /etc/hosts entries for peers with an associated hostname
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cjdnsExtraHosts = import (pkgs.runCommand "cjdns-hosts" {}
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# Generate a builder that produces an output usable as a Nix string value
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''
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exec >$out
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echo \'\'
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${concatStringsSep "\n" (mapAttrsToList (k: v:
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optionalString (v.hostname != "")
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"echo $(${pkgs.cjdns}/bin/publictoip6 ${v.publicKey}) ${v.hostname}")
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(cfg.ETHInterface.connectTo // cfg.UDPInterface.connectTo))}
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echo \'\'
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'');
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parseModules = x:
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x // { connectTo = mapAttrs (name: value: { inherit (value) password publicKey; }) x.connectTo; };
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# would be nice to merge 'cfg' with a //,
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# but the json nesting is wacky.
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cjdrouteConf = builtins.toJSON ( {
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admin = {
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bind = cfg.admin.bind;
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password = "@CJDNS_ADMIN_PASSWORD@";
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};
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authorizedPasswords = map (p: { password = p; }) cfg.authorizedPasswords;
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interfaces = {
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ETHInterface = if (cfg.ETHInterface.bind != "") then [ (parseModules cfg.ETHInterface) ] else [ ];
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UDPInterface = if (cfg.UDPInterface.bind != "") then [ (parseModules cfg.UDPInterface) ] else [ ];
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};
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privateKey = "@CJDNS_PRIVATE_KEY@";
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resetAfterInactivitySeconds = 100;
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router = {
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interface = { type = "TUNInterface"; };
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ipTunnel = {
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allowedConnections = [];
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outgoingConnections = [];
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};
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};
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security = [ { exemptAngel = 1; setuser = "nobody"; } ];
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});
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in
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{
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options = {
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services.cjdns = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable the cjdns network encryption
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and routing engine. A file at /etc/cjdns.keys will
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be created if it does not exist to contain a random
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secret key that your IPv6 address will be derived from.
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'';
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};
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confFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/etc/cjdroute.conf";
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description = ''
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Ignore all other cjdns options and load configuration from this file.
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'';
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};
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authorizedPasswords = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [
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"snyrfgkqsc98qh1y4s5hbu0j57xw5s0"
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"z9md3t4p45mfrjzdjurxn4wuj0d8swv"
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"49275fut6tmzu354pq70sr5b95qq0vj"
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];
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description = ''
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Any remote cjdns nodes that offer these passwords on
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connection will be allowed to route through this node.
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'';
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};
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admin = {
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bind = mkOption {
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type = types.str;
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default = "127.0.0.1:11234";
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description = ''
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Bind the administration port to this address and port.
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'';
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};
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};
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UDPInterface = {
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bind = mkOption {
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type = types.str;
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default = "";
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example = "192.168.1.32:43211";
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description = ''
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Address and port to bind UDP tunnels to.
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'';
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};
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connectTo = mkOption {
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type = types.attrsOf ( types.submodule ( connectToSubmodule ) );
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default = { };
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example = {
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"192.168.1.1:27313" = {
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hostname = "homer.hype";
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password = "5kG15EfpdcKNX3f2GSQ0H1HC7yIfxoCoImnO5FHM";
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publicKey = "371zpkgs8ss387tmr81q04mp0hg1skb51hw34vk1cq644mjqhup0.k";
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};
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};
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description = ''
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Credentials for making UDP tunnels.
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'';
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};
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};
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ETHInterface = {
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bind = mkOption {
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type = types.str;
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default = "";
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example = "eth0";
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description =
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''
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Bind to this device for native ethernet operation.
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<literal>all</literal> is a pseudo-name which will try to connect to all devices.
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'';
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};
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beacon = mkOption {
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type = types.int;
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default = 2;
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description = ''
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Auto-connect to other cjdns nodes on the same network.
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Options:
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0: Disabled.
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1: Accept beacons, this will cause cjdns to accept incoming
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beacon messages and try connecting to the sender.
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2: Accept and send beacons, this will cause cjdns to broadcast
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messages on the local network which contain a randomly
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generated per-session password, other nodes which have this
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set to 1 or 2 will hear the beacon messages and connect
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automatically.
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'';
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};
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connectTo = mkOption {
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type = types.attrsOf ( types.submodule ( connectToSubmodule ) );
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default = { };
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example = {
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"01:02:03:04:05:06" = {
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hostname = "homer.hype";
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password = "5kG15EfpdcKNX3f2GSQ0H1HC7yIfxoCoImnO5FHM";
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publicKey = "371zpkgs8ss387tmr81q04mp0hg1skb51hw34vk1cq644mjqhup0.k";
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};
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};
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description = ''
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Credentials for connecting look similar to UDP credientials
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except they begin with the mac address.
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'';
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};
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};
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addExtraHosts = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to add cjdns peers with an associated hostname to
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<filename>/etc/hosts</filename>. Beware that enabling this
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incurs heavy eval-time costs.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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boot.kernelModules = [ "tun" ];
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# networking.firewall.allowedUDPPorts = ...
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systemd.services.cjdns = {
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description = "cjdns: routing engine designed for security, scalability, speed and ease of use";
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wantedBy = [ "multi-user.target" "sleep.target"];
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after = [ "network-online.target" ];
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bindsTo = [ "network-online.target" ];
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preStart = if cfg.confFile != null then "" else ''
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[ -e /etc/cjdns.keys ] && source /etc/cjdns.keys
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if [ -z "$CJDNS_PRIVATE_KEY" ]; then
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shopt -s lastpipe
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${pkg}/bin/makekeys | { read private ipv6 public; }
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umask 0077
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echo "CJDNS_PRIVATE_KEY=$private" >> /etc/cjdns.keys
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echo -e "CJDNS_IPV6=$ipv6\nCJDNS_PUBLIC_KEY=$public" > /etc/cjdns.public
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chmod 600 /etc/cjdns.keys
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chmod 444 /etc/cjdns.public
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fi
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if [ -z "$CJDNS_ADMIN_PASSWORD" ]; then
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echo "CJDNS_ADMIN_PASSWORD=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 96)" \
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>> /etc/cjdns.keys
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fi
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'';
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script = (
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if cfg.confFile != null then "${pkg}/bin/cjdroute < ${cfg.confFile}" else
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''
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source /etc/cjdns.keys
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echo '${cjdrouteConf}' | sed \
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-e "s/@CJDNS_ADMIN_PASSWORD@/$CJDNS_ADMIN_PASSWORD/g" \
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-e "s/@CJDNS_PRIVATE_KEY@/$CJDNS_PRIVATE_KEY/g" \
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| ${pkg}/bin/cjdroute
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''
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);
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serviceConfig = {
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Type = "forking";
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Restart = "always";
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StartLimitInterval = 0;
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RestartSec = 1;
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CapabilityBoundingSet = "CAP_NET_ADMIN CAP_NET_RAW CAP_SETUID";
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ProtectSystem = true;
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# Doesn't work on i686, causing service to fail
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MemoryDenyWriteExecute = !pkgs.stdenv.isi686;
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ProtectHome = true;
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PrivateTmp = true;
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};
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};
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networking.extraHosts = mkIf cfg.addExtraHosts cjdnsExtraHosts;
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assertions = [
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{ assertion = ( cfg.ETHInterface.bind != "" || cfg.UDPInterface.bind != "" || cfg.confFile != null );
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message = "Neither cjdns.ETHInterface.bind nor cjdns.UDPInterface.bind defined.";
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}
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{ assertion = config.networking.enableIPv6;
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message = "networking.enableIPv6 must be enabled for CJDNS to work";
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}
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];
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};
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}
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