848 lines
25 KiB
Nix
848 lines
25 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.nsd;
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username = "nsd";
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stateDir = "/var/lib/nsd";
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pidFile = stateDir + "/var/nsd.pid";
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# build nsd with the options needed for the given config
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nsdPkg = pkgs.nsd.override {
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bind8Stats = cfg.bind8Stats;
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ipv6 = cfg.ipv6;
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ratelimit = cfg.ratelimit.enable;
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rootServer = cfg.rootServer;
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zoneStats = length (collect (x: (x.zoneStats or null) != null) cfg.zones) > 0;
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};
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nsdEnv = pkgs.buildEnv {
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name = "nsd-env";
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paths = [ configFile ]
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++ mapAttrsToList (name: zone: writeZoneData name zone.data) zoneConfigs;
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postBuild = ''
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echo "checking zone files"
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cd $out/zones
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for zoneFile in *; do
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${nsdPkg}/sbin/nsd-checkzone "$zoneFile" "$zoneFile" || {
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if grep -q \\\\\\$ "$zoneFile"; then
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echo zone "$zoneFile" contains escaped dollar signes \\\$
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echo Escaping them is not needed any more. Please make shure \
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to unescape them where they prefix a variable name
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fi
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exit 1
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}
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done
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echo "checking configuration file"
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${nsdPkg}/sbin/nsd-checkconf $out/nsd.conf
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'';
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};
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writeZoneData = name: text: pkgs.writeTextFile {
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inherit name text;
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destination = "/zones/${name}";
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};
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# options are ordered alphanumerically by the nixos option name
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configFile = pkgs.writeTextDir "nsd.conf" ''
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server:
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chroot: "${stateDir}"
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username: ${username}
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# The directory for zonefile: files. The daemon chdirs here.
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zonesdir: "${stateDir}"
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# the list of dynamically added zones.
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database: "${stateDir}/var/nsd.db"
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pidfile: "${pidFile}"
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xfrdfile: "${stateDir}/var/xfrd.state"
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xfrdir: "${stateDir}/tmp"
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zonelistfile: "${stateDir}/var/zone.list"
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# interfaces
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${forEach " ip-address: " cfg.interfaces}
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ip-freebind: ${yesOrNo cfg.ipFreebind}
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hide-version: ${yesOrNo cfg.hideVersion}
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identity: "${cfg.identity}"
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ip-transparent: ${yesOrNo cfg.ipTransparent}
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do-ip4: ${yesOrNo cfg.ipv4}
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ipv4-edns-size: ${toString cfg.ipv4EDNSSize}
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do-ip6: ${yesOrNo cfg.ipv6}
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ipv6-edns-size: ${toString cfg.ipv6EDNSSize}
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log-time-ascii: ${yesOrNo cfg.logTimeAscii}
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${maybeString "nsid: " cfg.nsid}
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port: ${toString cfg.port}
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reuseport: ${yesOrNo cfg.reuseport}
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round-robin: ${yesOrNo cfg.roundRobin}
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server-count: ${toString cfg.serverCount}
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${maybeToString "statistics: " cfg.statistics}
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tcp-count: ${toString cfg.tcpCount}
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tcp-query-count: ${toString cfg.tcpQueryCount}
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tcp-timeout: ${toString cfg.tcpTimeout}
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verbosity: ${toString cfg.verbosity}
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${maybeString "version: " cfg.version}
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xfrd-reload-timeout: ${toString cfg.xfrdReloadTimeout}
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zonefiles-check: ${yesOrNo cfg.zonefilesCheck}
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${maybeString "rrl-ipv4-prefix-length: " cfg.ratelimit.ipv4PrefixLength}
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${maybeString "rrl-ipv6-prefix-length: " cfg.ratelimit.ipv6PrefixLength}
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rrl-ratelimit: ${toString cfg.ratelimit.ratelimit}
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${maybeString "rrl-slip: " cfg.ratelimit.slip}
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rrl-size: ${toString cfg.ratelimit.size}
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rrl-whitelist-ratelimit: ${toString cfg.ratelimit.whitelistRatelimit}
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${keyConfigFile}
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remote-control:
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control-enable: ${yesOrNo cfg.remoteControl.enable}
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control-key-file: "${cfg.remoteControl.controlKeyFile}"
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control-cert-file: "${cfg.remoteControl.controlCertFile}"
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${forEach " control-interface: " cfg.remoteControl.interfaces}
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control-port: ${toString cfg.remoteControl.port}
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server-key-file: "${cfg.remoteControl.serverKeyFile}"
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server-cert-file: "${cfg.remoteControl.serverCertFile}"
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${concatStrings (mapAttrsToList zoneConfigFile zoneConfigs)}
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${cfg.extraConfig}
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'';
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yesOrNo = b: if b then "yes" else "no";
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maybeString = prefix: x: if x == null then "" else ''${prefix} "${x}"'';
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maybeToString = prefix: x: if x == null then "" else ''${prefix} ${toString x}'';
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forEach = pre: l: concatMapStrings (x: pre + x + "\n") l;
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keyConfigFile = concatStrings (mapAttrsToList (keyName: keyOptions: ''
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key:
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name: "${keyName}"
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algorithm: "${keyOptions.algorithm}"
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include: "${stateDir}/private/${keyName}"
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'') cfg.keys);
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copyKeys = concatStrings (mapAttrsToList (keyName: keyOptions: ''
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secret=$(cat "${keyOptions.keyFile}")
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dest="${stateDir}/private/${keyName}"
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echo " secret: \"$secret\"" > "$dest"
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chown ${username}:${username} "$dest"
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chmod 0400 "$dest"
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'') cfg.keys);
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# options are ordered alphanumerically by the nixos option name
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zoneConfigFile = name: zone: ''
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zone:
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name: "${name}"
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zonefile: "${stateDir}/zones/${name}"
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${maybeString "outgoing-interface: " zone.outgoingInterface}
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${forEach " rrl-whitelist: " zone.rrlWhitelist}
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${maybeString "zonestats: " zone.zoneStats}
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${maybeToString "max-refresh-time: " zone.maxRefreshSecs}
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${maybeToString "min-refresh-time: " zone.minRefreshSecs}
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${maybeToString "max-retry-time: " zone.maxRetrySecs}
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${maybeToString "min-retry-time: " zone.minRetrySecs}
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allow-axfr-fallback: ${yesOrNo zone.allowAXFRFallback}
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${forEach " allow-notify: " zone.allowNotify}
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${forEach " request-xfr: " zone.requestXFR}
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${forEach " notify: " zone.notify}
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notify-retry: ${toString zone.notifyRetry}
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${forEach " provide-xfr: " zone.provideXFR}
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'';
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zoneConfigs = zoneConfigs' {} "" { children = cfg.zones; };
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zoneConfigs' = parent: name: zone:
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if !(zone ? children) || zone.children == null || zone.children == { }
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# leaf -> actual zone
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then listToAttrs [ (nameValuePair name (parent // zone)) ]
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# fork -> pattern
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else zipAttrsWith (name: head) (
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mapAttrsToList (name: child: zoneConfigs' (parent // zone // { children = {}; }) name child)
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zone.children
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);
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# fighting infinite recursion
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zoneOptions = zoneOptionsRaw // childConfig zoneOptions1 true;
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zoneOptions1 = zoneOptionsRaw // childConfig zoneOptions2 false;
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zoneOptions2 = zoneOptionsRaw // childConfig zoneOptions3 false;
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zoneOptions3 = zoneOptionsRaw // childConfig zoneOptions4 false;
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zoneOptions4 = zoneOptionsRaw // childConfig zoneOptions5 false;
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zoneOptions5 = zoneOptionsRaw // childConfig zoneOptions6 false;
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zoneOptions6 = zoneOptionsRaw // childConfig null false;
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childConfig = x: v: { options.children = { type = types.attrsOf x; visible = v; }; };
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# options are ordered alphanumerically
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zoneOptionsRaw = types.submodule {
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options = {
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allowAXFRFallback = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If NSD as secondary server should be allowed to AXFR if the primary
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server does not allow IXFR.
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'';
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};
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allowNotify = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "192.0.2.0/24 NOKEY" "10.0.0.1-10.0.0.5 my_tsig_key_name"
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"10.0.3.4&255.255.0.0 BLOCKED"
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];
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description = ''
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Listed primary servers are allowed to notify this secondary server.
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<screen><![CDATA[
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Format: <ip> <key-name | NOKEY | BLOCKED>
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<ip> either a plain IPv4/IPv6 address or range. Valid patters for ranges:
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* 10.0.0.0/24 # via subnet size
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* 10.0.0.0&255.255.255.0 # via subnet mask
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* 10.0.0.1-10.0.0.254 # via range
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A optional port number could be added with a '@':
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* 2001:1234::1@1234
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<key-name | NOKEY | BLOCKED>
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* <key-name> will use the specified TSIG key
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* NOKEY no TSIG signature is required
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* BLOCKED notifies from non-listed or blocked IPs will be ignored
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* ]]></screen>
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'';
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};
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children = mkOption {
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default = {};
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description = ''
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Children zones inherit all options of their parents. Attributes
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defined in a child will overwrite the ones of its parent. Only
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leaf zones will be actually served. This way it's possible to
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define maybe zones which share most attributes without
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duplicating everything. This mechanism replaces nsd's patterns
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in a save and functional way.
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'';
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};
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data = mkOption {
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type = types.str;
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default = "";
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example = "";
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description = ''
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The actual zone data. This is the content of your zone file.
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Use imports or pkgs.lib.readFile if you don't want this data in your config file.
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'';
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};
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maxRefreshSecs = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Limit refresh time for secondary zones. This is the timer which
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checks to see if the zone has to be refetched when it expires.
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Normally the value from the SOA record is used, but this option
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restricts that value.
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'';
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};
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minRefreshSecs = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Limit refresh time for secondary zones.
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'';
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};
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maxRetrySecs = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Limit retry time for secondary zones. This is the timeout after
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a failed fetch attempt for the zone. Normally the value from
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the SOA record is used, but this option restricts that value.
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'';
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};
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minRetrySecs = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Limit retry time for secondary zones.
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'';
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};
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notify = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "10.0.0.1@3721 my_key" "::5 NOKEY" ];
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description = ''
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This primary server will notify all given secondary servers about
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zone changes.
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<screen><![CDATA[
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Format: <ip> <key-name | NOKEY>
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<ip> a plain IPv4/IPv6 address with on optional port number (ip@port)
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<key-name | NOKEY>
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* <key-name> sign notifies with the specified key
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* NOKEY don't sign notifies
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]]></screen>
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'';
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};
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notifyRetry = mkOption {
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type = types.int;
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default = 5;
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description = ''
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Specifies the number of retries for failed notifies. Set this along with notify.
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'';
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};
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outgoingInterface = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "2000::1@1234";
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description = ''
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This address will be used for zone-transfere requests if configured
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as a secondary server or notifications in case of a primary server.
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Supply either a plain IPv4 or IPv6 address with an optional port
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number (ip@port).
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'';
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};
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provideXFR = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "192.0.2.0/24 NOKEY" "192.0.2.0/24 my_tsig_key_name" ];
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description = ''
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Allow these IPs and TSIG to transfer zones, addr TSIG|NOKEY|BLOCKED
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address range 192.0.2.0/24, 1.2.3.4&255.255.0.0, 3.0.2.20-3.0.2.40
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'';
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};
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requestXFR = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [];
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description = ''
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Format: <code>[AXFR|UDP] <ip-address> <key-name | NOKEY></code>
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'';
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};
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rrlWhitelist = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Whitelists the given rrl-types.
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The RRL classification types are: nxdomain, error, referral, any,
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rrsig, wildcard, nodata, dnskey, positive, all
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'';
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};
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zoneStats = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "%s";
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description = ''
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When set to something distinct to null NSD is able to collect
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statistics per zone. All statistics of this zone(s) will be added
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to the group specified by this given name. Use "%s" to use the zones
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name as the group. The groups are output from nsd-control stats
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and stats_noreset.
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'';
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};
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};
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};
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in
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{
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# options are ordered alphanumerically
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options.services.nsd = {
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enable = mkEnableOption "NSD authoritative DNS server";
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bind8Stats = mkEnableOption "BIND8 like statistics";
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extraConfig = mkOption {
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type = types.str;
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default = "";
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description = ''
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Extra nsd config.
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'';
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};
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hideVersion = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether NSD should answer VERSION.BIND and VERSION.SERVER CHAOS class queries.
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'';
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};
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identity = mkOption {
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type = types.str;
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default = "unidentified server";
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description = ''
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Identify the server (CH TXT ID.SERVER entry).
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'';
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};
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interfaces = mkOption {
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type = types.listOf types.str;
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default = [ "127.0.0.0" "::1" ];
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description = ''
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What addresses the server should listen to.
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'';
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};
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ipFreebind = 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 bind to nonlocal addresses and interfaces that are down.
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Similar to ip-transparent.
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'';
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};
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ipTransparent = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Allow binding to non local addresses.
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'';
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};
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ipv4 = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to listen on IPv4 connections.
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'';
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};
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ipv4EDNSSize = mkOption {
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type = types.int;
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default = 4096;
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description = ''
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Preferred EDNS buffer size for IPv4.
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'';
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};
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ipv6 = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to listen on IPv6 connections.
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'';
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};
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ipv6EDNSSize = mkOption {
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type = types.int;
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default = 4096;
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description = ''
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Preferred EDNS buffer size for IPv6.
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'';
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};
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logTimeAscii = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Log time in ascii, if false then in unix epoch seconds.
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'';
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};
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nsid = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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NSID identity (hex string, or "ascii_somestring").
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'';
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};
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port = mkOption {
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type = types.int;
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default = 53;
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description = ''
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Port the service should bind do.
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'';
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};
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reuseport = mkOption {
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type = types.bool;
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default = pkgs.stdenv.isLinux;
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description = ''
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Whether to enable SO_REUSEPORT on all used sockets. This lets multiple
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processes bind to the same port. This speeds up operation especially
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if the server count is greater than one and makes fast restarts less
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prone to fail
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'';
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};
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rootServer = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether this server will be a root server (a DNS root server, you
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usually don't want that).
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'';
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};
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roundRobin = mkEnableOption "round robin rotation of records";
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serverCount = mkOption {
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type = types.int;
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default = 1;
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description = ''
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Number of NSD servers to fork. Put the number of CPUs to use here.
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'';
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};
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statistics = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Statistics are produced every number of seconds. Prints to log.
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If null no statistics are logged.
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'';
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};
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tcpCount = mkOption {
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type = types.int;
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default = 100;
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description = ''
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Maximum number of concurrent TCP connections per server.
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'';
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};
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|
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tcpQueryCount = mkOption {
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type = types.int;
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default = 0;
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description = ''
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Maximum number of queries served on a single TCP connection.
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0 means no maximum.
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'';
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};
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|
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tcpTimeout = mkOption {
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type = types.int;
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default = 120;
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description = ''
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TCP timeout in seconds.
|
|
'';
|
|
};
|
|
|
|
verbosity = mkOption {
|
|
type = types.int;
|
|
default = 0;
|
|
description = ''
|
|
Verbosity level.
|
|
'';
|
|
};
|
|
|
|
version = mkOption {
|
|
type = types.nullOr types.str;
|
|
default = null;
|
|
description = ''
|
|
The version string replied for CH TXT version.server and version.bind
|
|
queries. Will use the compiled package version on null.
|
|
See hideVersion for enabling/disabling this responses.
|
|
'';
|
|
};
|
|
|
|
xfrdReloadTimeout = mkOption {
|
|
type = types.int;
|
|
default = 1;
|
|
description = ''
|
|
Number of seconds between reloads triggered by xfrd.
|
|
'';
|
|
};
|
|
|
|
zonefilesCheck = mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description = ''
|
|
Whether to check mtime of all zone files on start and sighup.
|
|
'';
|
|
};
|
|
|
|
|
|
keys = mkOption {
|
|
type = types.attrsOf (types.submodule {
|
|
options = {
|
|
|
|
algorithm = mkOption {
|
|
type = types.str;
|
|
default = "hmac-sha256";
|
|
description = ''
|
|
Authentication algorithm for this key.
|
|
'';
|
|
};
|
|
|
|
keyFile = mkOption {
|
|
type = types.path;
|
|
description = ''
|
|
Path to the file which contains the actual base64 encoded
|
|
key. The key will be copied into "${stateDir}/private" before
|
|
NSD starts. The copied file is only accessibly by the NSD
|
|
user.
|
|
'';
|
|
};
|
|
|
|
};
|
|
});
|
|
default = {};
|
|
example = literalExample ''
|
|
{ "tsig.example.org" = {
|
|
algorithm = "hmac-md5";
|
|
keyFile = "/path/to/my/key";
|
|
};
|
|
}
|
|
'';
|
|
description = ''
|
|
Define your TSIG keys here.
|
|
'';
|
|
};
|
|
|
|
|
|
ratelimit = {
|
|
|
|
enable = mkEnableOption "ratelimit capabilities";
|
|
|
|
ipv4PrefixLength = mkOption {
|
|
type = types.nullOr types.int;
|
|
default = null;
|
|
description = ''
|
|
IPv4 prefix length. Addresses are grouped by netblock.
|
|
'';
|
|
};
|
|
|
|
ipv6PrefixLength = mkOption {
|
|
type = types.nullOr types.int;
|
|
default = null;
|
|
description = ''
|
|
IPv6 prefix length. Addresses are grouped by netblock.
|
|
'';
|
|
};
|
|
|
|
ratelimit = mkOption {
|
|
type = types.int;
|
|
default = 200;
|
|
description = ''
|
|
Max qps allowed from any query source.
|
|
0 means unlimited. With an verbosity of 2 blocked and
|
|
unblocked subnets will be logged.
|
|
'';
|
|
};
|
|
|
|
slip = mkOption {
|
|
type = types.nullOr types.int;
|
|
default = null;
|
|
description = ''
|
|
Number of packets that get discarded before replying a SLIP response.
|
|
0 disables SLIP responses. 1 will make every response a SLIP response.
|
|
'';
|
|
};
|
|
|
|
size = mkOption {
|
|
type = types.int;
|
|
default = 1000000;
|
|
description = ''
|
|
Size of the hashtable. More buckets use more memory but lower
|
|
the chance of hash hash collisions.
|
|
'';
|
|
};
|
|
|
|
whitelistRatelimit = mkOption {
|
|
type = types.int;
|
|
default = 2000;
|
|
description = ''
|
|
Max qps allowed from whitelisted sources.
|
|
0 means unlimited. Set the rrl-whitelist option for specific
|
|
queries to apply this limit instead of the default to them.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
|
|
remoteControl = {
|
|
|
|
enable = mkEnableOption "remote control via nsd-control";
|
|
|
|
controlCertFile = mkOption {
|
|
type = types.path;
|
|
default = "/etc/nsd/nsd_control.pem";
|
|
description = ''
|
|
Path to the client certificate signed with the server certificate.
|
|
This file is used by nsd-control and generated by nsd-control-setup.
|
|
'';
|
|
};
|
|
|
|
controlKeyFile = mkOption {
|
|
type = types.path;
|
|
default = "/etc/nsd/nsd_control.key";
|
|
description = ''
|
|
Path to the client private key, which is used by nsd-control
|
|
but not by the server. This file is generated by nsd-control-setup.
|
|
'';
|
|
};
|
|
|
|
interfaces = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [ "127.0.0.1" "::1" ];
|
|
description = ''
|
|
Which interfaces NSD should bind to for remote control.
|
|
'';
|
|
};
|
|
|
|
port = mkOption {
|
|
type = types.int;
|
|
default = 8952;
|
|
description = ''
|
|
Port number for remote control operations (uses TLS over TCP).
|
|
'';
|
|
};
|
|
|
|
serverCertFile = mkOption {
|
|
type = types.path;
|
|
default = "/etc/nsd/nsd_server.pem";
|
|
description = ''
|
|
Path to the server self signed certificate, which is used by the server
|
|
but and by nsd-control. This file is generated by nsd-control-setup.
|
|
'';
|
|
};
|
|
|
|
serverKeyFile = mkOption {
|
|
type = types.path;
|
|
default = "/etc/nsd/nsd_server.key";
|
|
description = ''
|
|
Path to the server private key, which is used by the server
|
|
but not by nsd-control. This file is generated by nsd-control-setup.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
|
|
zones = mkOption {
|
|
type = types.attrsOf zoneOptions;
|
|
default = {};
|
|
example = literalExample ''
|
|
{ "serverGroup1" = {
|
|
provideXFR = [ "10.1.2.3 NOKEY" ];
|
|
children = {
|
|
"example.com." = {
|
|
data = '''
|
|
$ORIGIN example.com.
|
|
$TTL 86400
|
|
@ IN SOA a.ns.example.com. admin.example.com. (
|
|
...
|
|
''';
|
|
};
|
|
"example.org." = {
|
|
data = '''
|
|
$ORIGIN example.org.
|
|
$TTL 86400
|
|
@ IN SOA a.ns.example.com. admin.example.com. (
|
|
...
|
|
''';
|
|
};
|
|
};
|
|
};
|
|
|
|
"example.net." = {
|
|
provideXFR = [ "10.3.2.1 NOKEY" ];
|
|
data = '''
|
|
...
|
|
''';
|
|
};
|
|
}
|
|
'';
|
|
description = ''
|
|
Define your zones here. Zones can cascade other zones and therefore
|
|
inherit settings from parent zones. Look at the definition of
|
|
children to learn about inheritance and child zones.
|
|
The given example will define 3 zones (example.(com|org|net).). Both
|
|
example.com. and example.org. inherit their configuration from
|
|
serverGroup1.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
config = mkIf cfg.enable {
|
|
|
|
users.extraGroups = singleton {
|
|
name = username;
|
|
gid = config.ids.gids.nsd;
|
|
};
|
|
|
|
users.extraUsers = singleton {
|
|
name = username;
|
|
description = "NSD service user";
|
|
home = stateDir;
|
|
createHome = true;
|
|
uid = config.ids.uids.nsd;
|
|
group = username;
|
|
};
|
|
|
|
systemd.services.nsd = {
|
|
description = "NSD authoritative only domain name service";
|
|
|
|
after = [ "keys.target" "network.target" ];
|
|
wantedBy = [ "multi-user.target" ];
|
|
wants = [ "keys.target" ];
|
|
|
|
serviceConfig = {
|
|
ExecStart = "${nsdPkg}/sbin/nsd -d -c ${nsdEnv}/nsd.conf";
|
|
PIDFile = pidFile;
|
|
Restart = "always";
|
|
RestartSec = "4s";
|
|
StartLimitBurst = 4;
|
|
StartLimitInterval = "5min";
|
|
};
|
|
|
|
preStart = ''
|
|
rm -Rf "${stateDir}/private/"
|
|
rm -Rf "${stateDir}/tmp/"
|
|
|
|
mkdir -m 0700 -p "${stateDir}/private"
|
|
mkdir -m 0700 -p "${stateDir}/tmp"
|
|
mkdir -m 0700 -p "${stateDir}/var"
|
|
|
|
cat > "${stateDir}/don't touch anything in here" << EOF
|
|
Everything in this directory except NSD's state in var is
|
|
automatically generated and will be purged and redeployed
|
|
by the nsd.service pre-start script.
|
|
EOF
|
|
|
|
chown ${username}:${username} -R "${stateDir}/private"
|
|
chown ${username}:${username} -R "${stateDir}/tmp"
|
|
chown ${username}:${username} -R "${stateDir}/var"
|
|
|
|
rm -rf "${stateDir}/zones"
|
|
cp -rL "${nsdEnv}/zones" "${stateDir}/zones"
|
|
|
|
${copyKeys}
|
|
'';
|
|
};
|
|
|
|
};
|
|
}
|