{ config, lib, pkgs, ... }:
with lib;
let
pkg = pkgs.cjdns;
cfg = config.services.cjdns;
connectToSubmodule =
{ ... }:
{ options =
{ password = mkOption {
type = types.str;
description = "Authorized password to the opposite end of the tunnel.";
};
publicKey = mkOption {
type = types.str;
description = "Public key at the opposite end of the tunnel.";
};
hostname = mkOption {
default = "";
example = "foobar.hype";
type = types.str;
description = "Optional hostname to add to /etc/hosts; prevents reverse lookup failures.";
};
};
};
# Additional /etc/hosts entries for peers with an associated hostname
cjdnsExtraHosts = pkgs.runCommandNoCC "cjdns-hosts" {} ''
exec >$out
${concatStringsSep "\n" (mapAttrsToList (k: v:
optionalString (v.hostname != "")
"echo $(${pkgs.cjdns}/bin/publictoip6 ${v.publicKey}) ${v.hostname}")
(cfg.ETHInterface.connectTo // cfg.UDPInterface.connectTo))}
'';
parseModules = x:
x // { connectTo = mapAttrs (name: value: { inherit (value) password publicKey; }) x.connectTo; };
cjdrouteConf = builtins.toJSON ( recursiveUpdate {
admin = {
bind = cfg.admin.bind;
password = "@CJDNS_ADMIN_PASSWORD@";
};
authorizedPasswords = map (p: { password = p; }) cfg.authorizedPasswords;
interfaces = {
ETHInterface = if (cfg.ETHInterface.bind != "") then [ (parseModules cfg.ETHInterface) ] else [ ];
UDPInterface = if (cfg.UDPInterface.bind != "") then [ (parseModules cfg.UDPInterface) ] else [ ];
};
privateKey = "@CJDNS_PRIVATE_KEY@";
resetAfterInactivitySeconds = 100;
router = {
interface = { type = "TUNInterface"; };
ipTunnel = {
allowedConnections = [];
outgoingConnections = [];
};
};
security = [ { exemptAngel = 1; setuser = "nobody"; } ];
} cfg.extraConfig);
in
{
options = {
services.cjdns = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable the cjdns network encryption
and routing engine. A file at /etc/cjdns.keys will
be created if it does not exist to contain a random
secret key that your IPv6 address will be derived from.
'';
};
extraConfig = mkOption {
type = types.attrs;
default = {};
example = { router.interface.tunDevice = "tun10"; };
description = ''
Extra configuration, given as attrs, that will be merged recursively
with the rest of the JSON generated by this module, at the root node.
'';
};
confFile = mkOption {
type = types.nullOr types.path;
default = null;
example = "/etc/cjdroute.conf";
description = ''
Ignore all other cjdns options and load configuration from this file.
'';
};
authorizedPasswords = mkOption {
type = types.listOf types.str;
default = [ ];
example = [
"snyrfgkqsc98qh1y4s5hbu0j57xw5s0"
"z9md3t4p45mfrjzdjurxn4wuj0d8swv"
"49275fut6tmzu354pq70sr5b95qq0vj"
];
description = ''
Any remote cjdns nodes that offer these passwords on
connection will be allowed to route through this node.
'';
};
admin = {
bind = mkOption {
type = types.str;
default = "127.0.0.1:11234";
description = ''
Bind the administration port to this address and port.
'';
};
};
UDPInterface = {
bind = mkOption {
type = types.str;
default = "";
example = "192.168.1.32:43211";
description = ''
Address and port to bind UDP tunnels to.
'';
};
connectTo = mkOption {
type = types.attrsOf ( types.submodule ( connectToSubmodule ) );
default = { };
example = literalExample ''
{
"192.168.1.1:27313" = {
hostname = "homer.hype";
password = "5kG15EfpdcKNX3f2GSQ0H1HC7yIfxoCoImnO5FHM";
publicKey = "371zpkgs8ss387tmr81q04mp0hg1skb51hw34vk1cq644mjqhup0.k";
};
}
'';
description = ''
Credentials for making UDP tunnels.
'';
};
};
ETHInterface = {
bind = mkOption {
type = types.str;
default = "";
example = "eth0";
description =
''
Bind to this device for native ethernet operation.
<literal>all</literal> is a pseudo-name which will try to connect to all devices.
'';
};
beacon = mkOption {
type = types.int;
default = 2;
description = ''
Auto-connect to other cjdns nodes on the same network.
Options:
0: Disabled.
1: Accept beacons, this will cause cjdns to accept incoming
beacon messages and try connecting to the sender.
2: Accept and send beacons, this will cause cjdns to broadcast
messages on the local network which contain a randomly
generated per-session password, other nodes which have this
set to 1 or 2 will hear the beacon messages and connect
automatically.
'';
};
connectTo = mkOption {
type = types.attrsOf ( types.submodule ( connectToSubmodule ) );
default = { };
example = literalExample ''
{
"01:02:03:04:05:06" = {
hostname = "homer.hype";
password = "5kG15EfpdcKNX3f2GSQ0H1HC7yIfxoCoImnO5FHM";
publicKey = "371zpkgs8ss387tmr81q04mp0hg1skb51hw34vk1cq644mjqhup0.k";
};
}
'';
description = ''
Credentials for connecting look similar to UDP credientials
except they begin with the mac address.
'';
};
};
addExtraHosts = mkOption {
type = types.bool;
default = false;
description = ''
Whether to add cjdns peers with an associated hostname to
<filename>/etc/hosts</filename>. Beware that enabling this
incurs heavy eval-time costs.
'';
};
};
};
config = mkIf cfg.enable {
boot.kernelModules = [ "tun" ];
# networking.firewall.allowedUDPPorts = ...
systemd.services.cjdns = {
description = "cjdns: routing engine designed for security, scalability, speed and ease of use";
wantedBy = [ "multi-user.target" "sleep.target"];
after = [ "network-online.target" ];
bindsTo = [ "network-online.target" ];
preStart = if cfg.confFile != null then "" else ''
[ -e /etc/cjdns.keys ] && source /etc/cjdns.keys
if [ -z "$CJDNS_PRIVATE_KEY" ]; then
shopt -s lastpipe
${pkg}/bin/makekeys | { read private ipv6 public; }
umask 0077
echo "CJDNS_PRIVATE_KEY=$private" >> /etc/cjdns.keys
echo -e "CJDNS_IPV6=$ipv6\nCJDNS_PUBLIC_KEY=$public" > /etc/cjdns.public
chmod 600 /etc/cjdns.keys
chmod 444 /etc/cjdns.public
fi
if [ -z "$CJDNS_ADMIN_PASSWORD" ]; then
echo "CJDNS_ADMIN_PASSWORD=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 96)" \
>> /etc/cjdns.keys
fi
'';
script = (
if cfg.confFile != null then "${pkg}/bin/cjdroute < ${cfg.confFile}" else
''
source /etc/cjdns.keys
(cat <<'EOF'
${cjdrouteConf}
EOF
) | sed \
-e "s/@CJDNS_ADMIN_PASSWORD@/$CJDNS_ADMIN_PASSWORD/g" \
-e "s/@CJDNS_PRIVATE_KEY@/$CJDNS_PRIVATE_KEY/g" \
| ${pkg}/bin/cjdroute
''
);
startLimitIntervalSec = 0;
serviceConfig = {
Type = "forking";
Restart = "always";
RestartSec = 1;
CapabilityBoundingSet = "CAP_NET_ADMIN CAP_NET_RAW CAP_SETUID";
ProtectSystem = true;
# Doesn't work on i686, causing service to fail
MemoryDenyWriteExecute = !pkgs.stdenv.isi686;
ProtectHome = true;
PrivateTmp = true;
};
};
networking.hostFiles = mkIf cfg.addExtraHosts [ cjdnsExtraHosts ];
assertions = [
{ assertion = ( cfg.ETHInterface.bind != "" || cfg.UDPInterface.bind != "" || cfg.confFile != null );
message = "Neither cjdns.ETHInterface.bind nor cjdns.UDPInterface.bind defined.";
}
{ assertion = config.networking.enableIPv6;
message = "networking.enableIPv6 must be enabled for CJDNS to work";
}
];
};
}
