367 lines
11 KiB
Nix
367 lines
11 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.krb5;
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# This is to provide support for old configuration options (as much as is
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# reasonable). This can be removed after 18.03 was released.
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defaultConfig = {
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libdefaults = optionalAttrs (cfg.defaultRealm != null)
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{ default_realm = cfg.defaultRealm; };
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realms = optionalAttrs (lib.all (value: value != null) [
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cfg.defaultRealm cfg.kdc cfg.kerberosAdminServer
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]) {
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${cfg.defaultRealm} = {
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kdc = cfg.kdc;
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admin_server = cfg.kerberosAdminServer;
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};
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};
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domain_realm = optionalAttrs (lib.all (value: value != null) [
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cfg.domainRealm cfg.defaultRealm
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]) {
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".${cfg.domainRealm}" = cfg.defaultRealm;
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${cfg.domainRealm} = cfg.defaultRealm;
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};
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};
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mergedConfig = (recursiveUpdate defaultConfig {
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inherit (config.krb5)
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kerberos libdefaults realms domain_realm capaths appdefaults plugins
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extraConfig config;
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});
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filterEmbeddedMetadata = value: if isAttrs value then
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(filterAttrs
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(attrName: attrValue: attrName != "_module" && attrValue != null)
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value)
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else value;
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mkIndent = depth: concatStrings (builtins.genList (_: " ") (2 * depth));
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mkRelation = name: value: "${name} = ${mkVal { inherit value; }}";
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mkVal = { value, depth ? 0 }:
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if (value == true) then "true"
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else if (value == false) then "false"
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else if (isInt value) then (toString value)
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else if (isList value) then
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concatMapStringsSep " " mkVal { inherit value depth; }
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else if (isAttrs value) then
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(concatStringsSep "\n${mkIndent (depth + 1)}"
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([ "{" ] ++ (mapAttrsToList
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(attrName: attrValue: let
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mappedAttrValue = mkVal {
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value = attrValue;
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depth = depth + 1;
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};
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in "${attrName} = ${mappedAttrValue}")
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value))) + "\n${mkIndent depth}}"
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else value;
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mkMappedAttrsOrString = value: concatMapStringsSep "\n"
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(line: if builtins.stringLength line > 0
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then "${mkIndent 1}${line}"
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else line)
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(splitString "\n"
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(if isAttrs value then
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concatStringsSep "\n"
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(mapAttrsToList mkRelation value)
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else value));
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in {
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###### interface
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options = {
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krb5 = {
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enable = mkEnableOption "building krb5.conf, configuration file for Kerberos V";
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kerberos = mkOption {
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type = types.package;
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default = pkgs.krb5Full;
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defaultText = "pkgs.krb5Full";
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example = literalExample "pkgs.heimdalFull";
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description = ''
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The Kerberos implementation that will be present in
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<literal>environment.systemPackages</literal> after enabling this
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service.
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'';
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};
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libdefaults = mkOption {
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type = with types; either attrs lines;
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default = {};
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apply = attrs: filterEmbeddedMetadata attrs;
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example = literalExample ''
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{
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default_realm = "ATHENA.MIT.EDU";
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};
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'';
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description = ''
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Settings used by the Kerberos V5 library.
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'';
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};
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realms = mkOption {
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type = with types; either attrs lines;
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default = {};
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example = literalExample ''
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{
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"ATHENA.MIT.EDU" = {
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admin_server = "athena.mit.edu";
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kdc = "athena.mit.edu";
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};
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};
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'';
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apply = attrs: filterEmbeddedMetadata attrs;
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description = "Realm-specific contact information and settings.";
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};
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domain_realm = mkOption {
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type = with types; either attrs lines;
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default = {};
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example = literalExample ''
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{
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"example.com" = "EXAMPLE.COM";
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".example.com" = "EXAMPLE.COM";
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};
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'';
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apply = attrs: filterEmbeddedMetadata attrs;
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description = ''
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Map of server hostnames to Kerberos realms.
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'';
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};
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capaths = mkOption {
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type = with types; either attrs lines;
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default = {};
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example = literalExample ''
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{
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"ATHENA.MIT.EDU" = {
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"EXAMPLE.COM" = ".";
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};
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"EXAMPLE.COM" = {
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"ATHENA.MIT.EDU" = ".";
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};
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};
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'';
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apply = attrs: filterEmbeddedMetadata attrs;
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description = ''
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Authentication paths for non-hierarchical cross-realm authentication.
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'';
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};
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appdefaults = mkOption {
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type = with types; either attrs lines;
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default = {};
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example = literalExample ''
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{
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pam = {
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debug = false;
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ticket_lifetime = 36000;
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renew_lifetime = 36000;
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max_timeout = 30;
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timeout_shift = 2;
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initial_timeout = 1;
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};
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};
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'';
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apply = attrs: filterEmbeddedMetadata attrs;
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description = ''
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Settings used by some Kerberos V5 applications.
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'';
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};
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plugins = mkOption {
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type = with types; either attrs lines;
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default = {};
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example = literalExample ''
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{
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ccselect = {
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disable = "k5identity";
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};
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};
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'';
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apply = attrs: filterEmbeddedMetadata attrs;
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description = ''
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Controls plugin module registration.
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'';
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};
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extraConfig = mkOption {
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type = with types; nullOr lines;
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default = null;
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example = ''
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[logging]
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kdc = SYSLOG:NOTICE
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admin_server = SYSLOG:NOTICE
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default = SYSLOG:NOTICE
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'';
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description = ''
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These lines go to the end of <literal>krb5.conf</literal> verbatim.
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<literal>krb5.conf</literal> may include any of the relations that are
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valid for <literal>kdc.conf</literal> (see <literal>man
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kdc.conf</literal>), but it is not a recommended practice.
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'';
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};
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config = mkOption {
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type = with types; nullOr lines;
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default = null;
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example = ''
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[libdefaults]
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default_realm = EXAMPLE.COM
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[realms]
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EXAMPLE.COM = {
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admin_server = kerberos.example.com
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kdc = kerberos.example.com
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default_principal_flags = +preauth
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}
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[domain_realm]
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example.com = EXAMPLE.COM
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.example.com = EXAMPLE.COM
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[logging]
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kdc = SYSLOG:NOTICE
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admin_server = SYSLOG:NOTICE
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default = SYSLOG:NOTICE
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'';
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description = ''
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Verbatim <literal>krb5.conf</literal> configuration. Note that this
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is mutually exclusive with configuration via
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<literal>libdefaults</literal>, <literal>realms</literal>,
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<literal>domain_realm</literal>, <literal>capaths</literal>,
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<literal>appdefaults</literal>, <literal>plugins</literal> and
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<literal>extraConfig</literal> configuration options. Consult
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<literal>man krb5.conf</literal> for documentation.
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'';
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};
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defaultRealm = mkOption {
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type = with types; nullOr str;
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default = null;
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example = "ATHENA.MIT.EDU";
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description = ''
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DEPRECATED, please use
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<literal>krb5.libdefaults.default_realm</literal>.
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'';
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};
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domainRealm = mkOption {
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type = with types; nullOr str;
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default = null;
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example = "athena.mit.edu";
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description = ''
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DEPRECATED, please create a map of server hostnames to Kerberos realms
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in <literal>krb5.domain_realm</literal>.
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'';
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};
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kdc = mkOption {
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type = with types; nullOr str;
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default = null;
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example = "kerberos.mit.edu";
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description = ''
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DEPRECATED, please pass a <literal>kdc</literal> attribute to a realm
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in <literal>krb5.realms</literal>.
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'';
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};
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kerberosAdminServer = mkOption {
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type = with types; nullOr str;
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default = null;
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example = "kerberos.mit.edu";
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description = ''
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DEPRECATED, please pass an <literal>admin_server</literal> attribute
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to a realm in <literal>krb5.realms</literal>.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.systemPackages = [ cfg.kerberos ];
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environment.etc."krb5.conf".text = if isString cfg.config
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then cfg.config
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else (''
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[libdefaults]
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${mkMappedAttrsOrString mergedConfig.libdefaults}
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[realms]
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${mkMappedAttrsOrString mergedConfig.realms}
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[domain_realm]
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${mkMappedAttrsOrString mergedConfig.domain_realm}
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[capaths]
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${mkMappedAttrsOrString mergedConfig.capaths}
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[appdefaults]
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${mkMappedAttrsOrString mergedConfig.appdefaults}
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[plugins]
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${mkMappedAttrsOrString mergedConfig.plugins}
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'' + optionalString (mergedConfig.extraConfig != null)
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("\n" + mergedConfig.extraConfig));
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warnings = flatten [
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(optional (cfg.defaultRealm != null) ''
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The option krb5.defaultRealm is deprecated, please use
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krb5.libdefaults.default_realm.
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'')
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(optional (cfg.domainRealm != null) ''
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The option krb5.domainRealm is deprecated, please use krb5.domain_realm.
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'')
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(optional (cfg.kdc != null) ''
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The option krb5.kdc is deprecated, please pass a kdc attribute to a
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realm in krb5.realms.
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'')
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(optional (cfg.kerberosAdminServer != null) ''
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The option krb5.kerberosAdminServer is deprecated, please pass an
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admin_server attribute to a realm in krb5.realms.
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'')
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];
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assertions = [
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{ assertion = !((builtins.any (value: value != null) [
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cfg.defaultRealm cfg.domainRealm cfg.kdc cfg.kerberosAdminServer
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]) && ((builtins.any (value: value != {}) [
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cfg.libdefaults cfg.realms cfg.domain_realm cfg.capaths
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cfg.appdefaults cfg.plugins
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]) || (builtins.any (value: value != null) [
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cfg.config cfg.extraConfig
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])));
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message = ''
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Configuration of krb5.conf by deprecated options is mutually exclusive
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with configuration by section. Please migrate your config using the
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attributes suggested in the warnings.
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'';
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}
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{ assertion = !(cfg.config != null
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&& ((builtins.any (value: value != {}) [
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cfg.libdefaults cfg.realms cfg.domain_realm cfg.capaths
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cfg.appdefaults cfg.plugins
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]) || (builtins.any (value: value != null) [
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cfg.extraConfig cfg.defaultRealm cfg.domainRealm cfg.kdc
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cfg.kerberosAdminServer
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])));
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message = ''
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Configuration of krb5.conf using krb.config is mutually exclusive with
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configuration by section. If you want to mix the two, you can pass
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lines to any configuration section or lines to krb5.extraConfig.
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'';
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}
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];
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};
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}
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