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104 lines
3.3 KiB
Nix
104 lines
3.3 KiB
Nix
# Configuration for the Name Service Switch (/etc/nsswitch.conf).
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{ config, lib, pkgs, ... }:
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with lib;
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let
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# only with nscd up and running we can load NSS modules that are not integrated in NSS
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canLoadExternalModules = config.services.nscd.enable;
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myhostname = canLoadExternalModules;
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mymachines = canLoadExternalModules;
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nssmdns = canLoadExternalModules && config.services.avahi.nssmdns;
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nsswins = canLoadExternalModules && config.services.samba.nsswins;
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ldap = canLoadExternalModules && (config.users.ldap.enable && config.users.ldap.nsswitch);
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sssd = canLoadExternalModules && config.services.sssd.enable;
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resolved = canLoadExternalModules && config.services.resolved.enable;
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hostArray = [ "files" ]
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++ optional mymachines "mymachines"
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++ optional nssmdns "mdns_minimal [NOTFOUND=return]"
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++ optional nsswins "wins"
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++ optional resolved "resolve [!UNAVAIL=return]"
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++ [ "dns" ]
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++ optional nssmdns "mdns"
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++ optional myhostname "myhostname";
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passwdArray = [ "files" ]
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++ optional sssd "sss"
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++ optional ldap "ldap"
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++ optional mymachines "mymachines"
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++ [ "systemd" ];
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shadowArray = [ "files" ]
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++ optional sssd "sss"
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++ optional ldap "ldap";
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servicesArray = [ "files" ]
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++ optional sssd "sss";
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in {
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options = {
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# NSS modules. Hacky!
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# Only works with nscd!
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system.nssModules = mkOption {
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type = types.listOf types.path;
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internal = true;
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default = [];
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description = ''
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Search path for NSS (Name Service Switch) modules. This allows
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several DNS resolution methods to be specified via
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<filename>/etc/nsswitch.conf</filename>.
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'';
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apply = list:
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{
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inherit list;
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path = makeLibraryPath list;
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};
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};
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};
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config = {
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assertions = [
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{
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# generic catch if the NixOS module adding to nssModules does not prevent it with specific message.
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assertion = config.system.nssModules.path != "" -> canLoadExternalModules;
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message = "Loading NSS modules from path ${config.system.nssModules.path} requires nscd being enabled.";
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}
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{
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# resolved does not need to add to nssModules, therefore needs an extra assertion
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assertion = resolved -> canLoadExternalModules;
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message = "Loading systemd-resolved's nss-resolve NSS module requires nscd being enabled.";
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}
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];
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# Name Service Switch configuration file. Required by the C
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# library. !!! Factor out the mdns stuff. The avahi module
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# should define an option used by this module.
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environment.etc."nsswitch.conf".text = ''
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passwd: ${concatStringsSep " " passwdArray}
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group: ${concatStringsSep " " passwdArray}
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shadow: ${concatStringsSep " " shadowArray}
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hosts: ${concatStringsSep " " hostArray}
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networks: files
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ethers: files
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services: ${concatStringsSep " " servicesArray}
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protocols: files
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rpc: files
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'';
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# Systemd provides nss-myhostname to ensure that our hostname
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# always resolves to a valid IP address. It returns all locally
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# configured IP addresses, or ::1 and 127.0.0.2 as
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# fallbacks. Systemd also provides nss-mymachines to return IP
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# addresses of local containers.
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system.nssModules = optionals canLoadExternalModules [ config.systemd.package.out ];
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};
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}
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