c1536f5c78
- The order of NSS (host) modules has been brought in line with upstream
recommendations:
- The `myhostname` module is placed before the `resolve` (optional) and `dns`
entries, but after `file` (to allow overriding via `/etc/hosts` /
`networking.extraHosts`, and prevent ISPs with catchall-DNS resolvers from
hijacking `.localhost` domains)
- The `mymachines` module, which provides hostname resolution for local
containers (registered with `systemd-machined`) is placed to the front, to
make sure its mappings are preferred over other resolvers.
- If systemd-networkd is enabled, the `resolve` module is placed before
`files` and `myhostname`, as it provides the same logic internally, with
caching.
- The `mdns(_minimal)` module has been updated to the new priorities.
If you use your own NSS host modules, make sure to update your priorities
according to these rules:
- NSS modules which should be queried before `resolved` DNS resolution should
use mkBefore.
- NSS modules which should be queried after `resolved`, `files` and
`myhostname`, but before `dns` should use the default priority
- NSS modules which should come after `dns` should use mkAfter.
133 lines
3.9 KiB
Nix
133 lines
3.9 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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{
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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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system.nssDatabases = {
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passwd = mkOption {
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type = types.listOf types.str;
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description = ''
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List of passwd entries to configure in <filename>/etc/nsswitch.conf</filename>.
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Note that "files" is always prepended while "systemd" is appended if nscd is enabled.
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This option only takes effect if nscd is enabled.
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'';
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default = [];
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};
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group = mkOption {
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type = types.listOf types.str;
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description = ''
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List of group entries to configure in <filename>/etc/nsswitch.conf</filename>.
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Note that "files" is always prepended while "systemd" is appended if nscd is enabled.
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This option only takes effect if nscd is enabled.
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'';
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default = [];
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};
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shadow = mkOption {
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type = types.listOf types.str;
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description = ''
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List of shadow entries to configure in <filename>/etc/nsswitch.conf</filename>.
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Note that "files" is always prepended.
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This option only takes effect if nscd is enabled.
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'';
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default = [];
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};
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hosts = mkOption {
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type = types.listOf types.str;
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description = ''
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List of hosts entries to configure in <filename>/etc/nsswitch.conf</filename>.
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Note that "files" is always prepended, and "dns" and "myhostname" are always appended.
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This option only takes effect if nscd is enabled.
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'';
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default = [];
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};
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services = mkOption {
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type = types.listOf types.str;
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description = ''
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List of services entries to configure in <filename>/etc/nsswitch.conf</filename>.
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Note that "files" is always prepended.
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This option only takes effect if nscd is enabled.
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'';
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default = [];
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};
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};
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};
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imports = [
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(mkRenamedOptionModule [ "system" "nssHosts" ] [ "system" "nssDatabases" "hosts" ])
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];
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config = {
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assertions = [
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{
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# Prevent users from disabling nscd, with nssModules being set.
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# If disabling nscd is really necessary, it's still possible to opt out
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# by forcing config.system.nssModules to [].
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assertion = config.system.nssModules.path != "" -> config.services.nscd.enable;
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message = "Loading NSS modules from system.nssModules (${config.system.nssModules.path}), requires services.nscd.enable being set to true.";
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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.
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environment.etc."nsswitch.conf".text = ''
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passwd: ${concatStringsSep " " config.system.nssDatabases.passwd}
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group: ${concatStringsSep " " config.system.nssDatabases.group}
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shadow: ${concatStringsSep " " config.system.nssDatabases.shadow}
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hosts: ${concatStringsSep " " config.system.nssDatabases.hosts}
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networks: files
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ethers: files
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services: ${concatStringsSep " " config.system.nssDatabases.services}
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protocols: files
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rpc: files
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'';
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system.nssDatabases = {
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passwd = mkBefore [ "files" ];
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group = mkBefore [ "files" ];
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shadow = mkBefore [ "files" ];
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hosts = mkMerge [
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(mkOrder 998 [ "files" ])
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(mkOrder 1499 [ "dns" ])
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];
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services = mkBefore [ "files" ];
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};
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};
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}
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