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nixos/krb5: complete rewrite 

The `krb5` service was a bit lacking.

Addresses NixOS/nixpkgs#11268, partially addresses NixOS/nixpkgs#29623.
release-18.03-flake
Ruben Maher 2017-09-23 12:48:44 +09:30
parent 047c576353
commit 06e15e59f9
6 changed files with 527 additions and 207 deletions
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206
nixos/modules/config/krb5.nix
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@ -1,206 +0,0 @@
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.krb5;
in
{
###### interface
options = {
krb5 = {
enable = mkOption {
default = false;
description = "Whether to enable Kerberos V.";
};
defaultRealm = mkOption {
default = "ATENA.MIT.EDU";
description = "Default realm.";
};
domainRealm = mkOption {
default = "atena.mit.edu";
description = "Default domain realm.";
};
kdc = mkOption {
default = "kerberos.mit.edu";
description = "Key Distribution Center";
};
kerberosAdminServer = mkOption {
default = "kerberos.mit.edu";
description = "Kerberos Admin Server.";
};
};
};
###### implementation
config = mkIf config.krb5.enable {
environment.systemPackages = [ pkgs.krb5Full ];
environment.etc."krb5.conf".text =
''
[libdefaults]
default_realm = ${cfg.defaultRealm}
encrypt = true
# The following krb5.conf variables are only for MIT Kerberos.
krb4_config = /etc/krb.conf
krb4_realms = /etc/krb.realms
kdc_timesync = 1
ccache_type = 4
forwardable = true
proxiable = true
# The following encryption type specification will be used by MIT Kerberos
# if uncommented. In general, the defaults in the MIT Kerberos code are
# correct and overriding these specifications only serves to disable new
# encryption types as they are added, creating interoperability problems.
# default_tgs_enctypes = aes256-cts arcfour-hmac-md5 des3-hmac-sha1 des-cbc-crc des-cbc-md5
# default_tkt_enctypes = aes256-cts arcfour-hmac-md5 des3-hmac-sha1 des-cbc-crc des-cbc-md5
# permitted_enctypes = aes256-cts arcfour-hmac-md5 des3-hmac-sha1 des-cbc-crc des-cbc-md5
# The following libdefaults parameters are only for Heimdal Kerberos.
v4_instance_resolve = false
v4_name_convert = {
host = {
rcmd = host
ftp = ftp
}
plain = {
something = something-else
}
}
fcc-mit-ticketflags = true
[realms]
${cfg.defaultRealm} = {
kdc = ${cfg.kdc}
admin_server = ${cfg.kerberosAdminServer}
#kpasswd_server = ${cfg.kerberosAdminServer}
}
ATHENA.MIT.EDU = {
kdc = kerberos.mit.edu:88
kdc = kerberos-1.mit.edu:88
kdc = kerberos-2.mit.edu:88
admin_server = kerberos.mit.edu
default_domain = mit.edu
}
MEDIA-LAB.MIT.EDU = {
kdc = kerberos.media.mit.edu
admin_server = kerberos.media.mit.edu
}
ZONE.MIT.EDU = {
kdc = casio.mit.edu
kdc = seiko.mit.edu
admin_server = casio.mit.edu
}
MOOF.MIT.EDU = {
kdc = three-headed-dogcow.mit.edu:88
kdc = three-headed-dogcow-1.mit.edu:88
admin_server = three-headed-dogcow.mit.edu
}
CSAIL.MIT.EDU = {
kdc = kerberos-1.csail.mit.edu
kdc = kerberos-2.csail.mit.edu
admin_server = kerberos.csail.mit.edu
default_domain = csail.mit.edu
krb524_server = krb524.csail.mit.edu
}
IHTFP.ORG = {
kdc = kerberos.ihtfp.org
admin_server = kerberos.ihtfp.org
}
GNU.ORG = {
kdc = kerberos.gnu.org
kdc = kerberos-2.gnu.org
kdc = kerberos-3.gnu.org
admin_server = kerberos.gnu.org
}
1TS.ORG = {
kdc = kerberos.1ts.org
admin_server = kerberos.1ts.org
}
GRATUITOUS.ORG = {
kdc = kerberos.gratuitous.org
admin_server = kerberos.gratuitous.org
}
DOOMCOM.ORG = {
kdc = kerberos.doomcom.org
admin_server = kerberos.doomcom.org
}
ANDREW.CMU.EDU = {
kdc = vice28.fs.andrew.cmu.edu
kdc = vice2.fs.andrew.cmu.edu
kdc = vice11.fs.andrew.cmu.edu
kdc = vice12.fs.andrew.cmu.edu
admin_server = vice28.fs.andrew.cmu.edu
default_domain = andrew.cmu.edu
}
CS.CMU.EDU = {
kdc = kerberos.cs.cmu.edu
kdc = kerberos-2.srv.cs.cmu.edu
admin_server = kerberos.cs.cmu.edu
}
DEMENTIA.ORG = {
kdc = kerberos.dementia.org
kdc = kerberos2.dementia.org
admin_server = kerberos.dementia.org
}
stanford.edu = {
kdc = krb5auth1.stanford.edu
kdc = krb5auth2.stanford.edu
kdc = krb5auth3.stanford.edu
admin_server = krb5-admin.stanford.edu
default_domain = stanford.edu
}
[domain_realm]
.${cfg.domainRealm} = ${cfg.defaultRealm}
${cfg.domainRealm} = ${cfg.defaultRealm}
.mit.edu = ATHENA.MIT.EDU
mit.edu = ATHENA.MIT.EDU
.exchange.mit.edu = EXCHANGE.MIT.EDU
exchange.mit.edu = EXCHANGE.MIT.EDU
.media.mit.edu = MEDIA-LAB.MIT.EDU
media.mit.edu = MEDIA-LAB.MIT.EDU
.csail.mit.edu = CSAIL.MIT.EDU
csail.mit.edu = CSAIL.MIT.EDU
.whoi.edu = ATHENA.MIT.EDU
whoi.edu = ATHENA.MIT.EDU
.stanford.edu = stanford.edu
[logging]
kdc = SYSLOG:INFO:DAEMON
admin_server = SYSLOG:INFO:DAEMON
default = SYSLOG:INFO:DAEMON
krb4_convert = true
krb4_get_tickets = false
[appdefaults]
pam = {
debug = false
ticket_lifetime = 36000
renew_lifetime = 36000
max_timeout = 30
timeout_shift = 2
initial_timeout = 1
}
'';
};
}

367
nixos/modules/config/krb5/default.nix 100644
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@ -0,0 +1,367 @@
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.krb5;
# This is to provide support for old configuration options (as much as is
# reasonable). This can probably be removed after some time.
defaultConfig = {
libdefaults = optionalAttrs (cfg.defaultRealm != null)
{ default_realm = cfg.defaultRealm; };
realms = optionalAttrs (lib.all (value: value != null) [
cfg.defaultRealm cfg.kdc cfg.kerberosAdminServer
]) {
"${cfg.defaultRealm}" = {
kdc = cfg.kdc;
admin_server = cfg.kerberosAdminServer;
};
};
domain_realm = optionalAttrs (lib.all (value: value != null) [
cfg.domainRealm cfg.defaultRealm
]) {
".${cfg.domainRealm}" = cfg.defaultRealm;
"${cfg.domainRealm}" = cfg.defaultRealm;
};
};
mergedConfig = (recursiveUpdate defaultConfig {
inherit (config.krb5)
kerberos libdefaults realms domain_realm capaths appdefaults plugins
extraConfig config;
});
filterEmbeddedMetadata = value: if isAttrs value then
(filterAttrs
(attrName: attrValue: attrName != "_module" && attrValue != null)
value)
else value;
mkIndent = depth: concatStrings (builtins.genList (_: " ") (2 * depth));
mkRelation = name: value: "${name} = ${mkVal { inherit value; }}";
mkVal = { value, depth ? 0 }:
if (value == true) then "true"
else if (value == false) then "false"
else if (isInt value) then (toString value)
else if (isList value) then
concatMapStringsSep " " mkVal { inherit value depth; }
else if (isAttrs value) then
(concatStringsSep "\n${mkIndent (depth + 1)}"
([ "{" ] ++ (mapAttrsToList
(attrName: attrValue: let
mappedAttrValue = mkVal {
value = attrValue;
depth = depth + 1;
};
in "${attrName} = ${mappedAttrValue}")
value))) + "\n${mkIndent depth}}"
else value;
mkMappedAttrsOrString = value: concatMapStringsSep "\n"
(line: if builtins.stringLength line > 0
then "${mkIndent 1}${line}"
else line)
(splitString "\n"
(if isAttrs value then
concatStringsSep "\n"
(mapAttrsToList mkRelation value)
else value));
in {
###### interface
options = {
krb5 = {
enable = mkEnableOption "Whether to enable Kerberos V.";
kerberos = mkOption {
type = types.package;
default = pkgs.krb5Full;
defaultText = "pkgs.krb5Full";
example = literalExample "pkgs.heimdalFull";
description = ''
The Kerberos implementation that will be present in
<literal>environment.systemPackages</literal> after enabling this
service.
'';
};
libdefaults = mkOption {
type = with types; either attrs lines;
default = {};
apply = attrs: filterEmbeddedMetadata attrs;
example = literalExample ''
{
default_realm = "ATHENA.MIT.EDU";
};
'';
description = ''
Settings used by the Kerberos V5 library.
'';
};
realms = mkOption {
type = with types; either attrs lines;
default = {};
example = literalExample ''
{
"ATHENA.MIT.EDU" = {
admin_server = "athena.mit.edu";
kdc = "athena.mit.edu";
};
};
'';
apply = attrs: filterEmbeddedMetadata attrs;
description = "Realm-specific contact information and settings.";
};
domain_realm = mkOption {
type = with types; either attrs lines;
default = {};
example = literalExample ''
{
"example.com" = "EXAMPLE.COM";
".example.com" = "EXAMPLE.COM";
};
'';
apply = attrs: filterEmbeddedMetadata attrs;
description = ''
Map of server hostnames to Kerberos realms.
'';
};
capaths = mkOption {
type = with types; either attrs lines;
default = {};
example = literalExample ''
{
"ATHENA.MIT.EDU" = {
"EXAMPLE.COM" = ".";
};
"EXAMPLE.COM" = {
"ATHENA.MIT.EDU" = ".";
};
};
'';
apply = attrs: filterEmbeddedMetadata attrs;
description = ''
Authentication paths for non-hierarchical cross-realm authentication.
'';
};
appdefaults = mkOption {
type = with types; either attrs lines;
default = {};
example = literalExample ''
{
pam = {
debug = false;
ticket_lifetime = 36000;
renew_lifetime = 36000;
max_timeout = 30;
timeout_shift = 2;
initial_timeout = 1;
};
};
'';
apply = attrs: filterEmbeddedMetadata attrs;
description = ''
Settings used by some Kerberos V5 applications.
'';
};
plugins = mkOption {
type = with types; either attrs lines;
default = {};
example = literalExample ''
{
ccselect = {
disable = "k5identity";
};
};
'';
apply = attrs: filterEmbeddedMetadata attrs;
description = ''
Controls plugin module registration.
'';
};
extraConfig = mkOption {
type = with types; nullOr lines;
default = null;
example = ''
[logging]
kdc = SYSLOG:NOTICE
admin_server = SYSLOG:NOTICE
default = SYSLOG:NOTICE
'';
description = ''
These lines go to the end of <literal>krb5.conf</literal> verbatim.
<literal>krb5.conf</literal> may include any of the relations that are
valid for <literal>kdc.conf</literal> (see <literal>man
kdc.conf</literal>), but it is not a recommended practice.
'';
};
config = mkOption {
type = with types; nullOr lines;
default = null;
example = ''
[libdefaults]
default_realm = EXAMPLE.COM
[realms]
EXAMPLE.COM = {
admin_server = kerberos.example.com
kdc = kerberos.example.com
default_principal_flags = +preauth
}
[domain_realm]
example.com = EXAMPLE.COM
.example.com = EXAMPLE.COM
[logging]
kdc = SYSLOG:NOTICE
admin_server = SYSLOG:NOTICE
default = SYSLOG:NOTICE
'';
description = ''
Verbatim <literal>krb5.conf</literal> configuration. Note that this
is mutually exclusive with configuration via
<literal>libdefaults</literal>, <literal>realms</literal>,
<literal>domain_realm</literal>, <literal>capaths</literal>,
<literal>appdefaults</literal>, <literal>plugins</literal> and
<literal>extraConfig</literal> configuration options. Consult
<literal>man krb5.conf</literal> for documentation.
'';
};
defaultRealm = mkOption {
type = with types; nullOr str;
default = null;
example = "ATHENA.MIT.EDU";
description = ''
DEPRECATED, please use
<literal>krb5.libdefaults.default_realm</literal>.
'';
};
domainRealm = mkOption {
type = with types; nullOr str;
default = null;
example = "athena.mit.edu";
description = ''
DEPRECATED, please create a map of server hostnames to Kerberos realms
in <literal>krb5.domain_realm</literal>.
'';
};
kdc = mkOption {
type = with types; nullOr str;
default = null;
example = "kerberos.mit.edu";
description = ''
DEPRECATED, please pass a <literal>kdc</literal> attribute to a realm
in <literal>krb5.realms</literal>.
'';
};
kerberosAdminServer = mkOption {
type = with types; nullOr str;
default = null;
example = "kerberos.mit.edu";
description = ''
DEPRECATED, please pass an <literal>admin_server</literal> attribute
to a realm in <literal>krb5.realms</literal>.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ cfg.kerberos ];
environment.etc."krb5.conf".text = if isString cfg.config
then cfg.config
else (''
[libdefaults]
${mkMappedAttrsOrString mergedConfig.libdefaults}
[realms]
${mkMappedAttrsOrString mergedConfig.realms}
[domain_realm]
${mkMappedAttrsOrString mergedConfig.domain_realm}
[capaths]
${mkMappedAttrsOrString mergedConfig.capaths}
[appdefaults]
${mkMappedAttrsOrString mergedConfig.appdefaults}
[plugins]
${mkMappedAttrsOrString mergedConfig.plugins}
'' + optionalString (mergedConfig.extraConfig != null)
("\n" + mergedConfig.extraConfig));
warnings = flatten [
(optional (cfg.defaultRealm != null) ''
The option krb5.defaultRealm is deprecated, please use
krb5.libdefaults.default_realm.
'')
(optional (cfg.domainRealm != null) ''
The option krb5.domainRealm is deprecated, please use krb5.domain_realm.
'')
(optional (cfg.kdc != null) ''
The option krb5.kdc is deprecated, please pass a kdc attribute to a
realm in krb5.realms.
'')
(optional (cfg.kerberosAdminServer != null) ''
The option krb5.kerberosAdminServer is deprecated, please pass an
admin_server attribute to a realm in krb5.realms.
'')
];
assertions = [
{ assertion = !((builtins.any (value: value != null) [
cfg.defaultRealm cfg.domainRealm cfg.kdc cfg.kerberosAdminServer
]) && ((builtins.any (value: value != {}) [
cfg.libdefaults cfg.realms cfg.domain_realm cfg.capaths
cfg.appdefaults cfg.plugins
]) || (builtins.any (value: value != null) [
cfg.config cfg.extraConfig
])));
message = ''
Configuration of krb5.conf by deprecated options is mutually exclusive
with configuration by section. Please migrate your config using the
attributes suggested in the warnings.
'';
}
{ assertion = !(cfg.config != null
&& ((builtins.any (value: value != {}) [
cfg.libdefaults cfg.realms cfg.domain_realm cfg.capaths
cfg.appdefaults cfg.plugins
]) || (builtins.any (value: value != null) [
cfg.extraConfig cfg.defaultRealm cfg.domainRealm cfg.kdc
cfg.kerberosAdminServer
])));
message = ''
Configuration of krb5.conf using krb.config is mutually exclusive with
configuration by section. If you want to mix the two, you can pass
lines to any configuration section or lines to krb5.extraConfig.
'';
}
];
};
}

2
nixos/modules/module-list.nix
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@ -9,7 +9,7 @@
./config/fonts/ghostscript.nix
./config/gnu.nix
./config/i18n.nix
./config/krb5.nix
./config/krb5/default.nix
./config/ldap.nix
./config/networking.nix
./config/no-x-libs.nix

5
nixos/tests/krb5/default.nix 100644
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@ -0,0 +1,5 @@
{ system ? builtins.currentSystem }:
{
example-config = import ./example-config.nix { inherit system; };
deprecated-config = import ./deprecated-config.nix { inherit system; };
}

48
nixos/tests/krb5/deprecated-config.nix 100644
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@ -0,0 +1,48 @@
# Verifies that the configuration suggested in deprecated example values
# will result in the expected output.
import ../make-test.nix ({ pkgs, ...} : {
name = "krb5-with-deprecated-config";
meta = with pkgs.stdenv.lib.maintainers; {
maintainers = [ eqyiel ];
};
machine =
{ config, pkgs, ... }: {
krb5 = {
enable = true;
defaultRealm = "ATHENA.MIT.EDU";
domainRealm = "athena.mit.edu";
kdc = "kerberos.mit.edu";
kerberosAdminServer = "kerberos.mit.edu";
};
};
testScript =
let snapshot = pkgs.writeText "krb5-with-deprecated-config.conf" ''
[libdefaults]
default_realm = ATHENA.MIT.EDU
[realms]
ATHENA.MIT.EDU = {
admin_server = kerberos.mit.edu
kdc = kerberos.mit.edu
}
[domain_realm]
.athena.mit.edu = ATHENA.MIT.EDU
athena.mit.edu = ATHENA.MIT.EDU
[capaths]
[appdefaults]
[plugins]
'';
in ''
$machine->succeed("diff /etc/krb5.conf ${snapshot}");
'';
})

106
nixos/tests/krb5/example-config.nix 100644
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@ -0,0 +1,106 @@
# Verifies that the configuration suggested in (non-deprecated) example values
# will result in the expected output.
import ../make-test.nix ({ pkgs, ...} : {
name = "krb5-with-example-config";
meta = with pkgs.stdenv.lib.maintainers; {
maintainers = [ eqyiel ];
};
machine =
{ config, pkgs, ... }: {
krb5 = {
enable = true;
kerberos = pkgs.krb5Full;
libdefaults = {
default_realm = "ATHENA.MIT.EDU";
};
realms = {
"ATHENA.MIT.EDU" = {
admin_server = "athena.mit.edu";
kdc = "athena.mit.edu";
};
};
domain_realm = {
"example.com" = "EXAMPLE.COM";
".example.com" = "EXAMPLE.COM";
};
capaths = {
"ATHENA.MIT.EDU" = {
"EXAMPLE.COM" = ".";
};
"EXAMPLE.COM" = {
"ATHENA.MIT.EDU" = ".";
};
};
appdefaults = {
pam = {
debug = false;
ticket_lifetime = 36000;
renew_lifetime = 36000;
max_timeout = 30;
timeout_shift = 2;
initial_timeout = 1;
};
};
plugins = {
ccselect = {
disable = "k5identity";
};
};
extraConfig = ''
[logging]
kdc = SYSLOG:NOTICE
admin_server = SYSLOG:NOTICE
default = SYSLOG:NOTICE
'';
};
};
testScript =
let snapshot = pkgs.writeText "krb5-with-example-config.conf" ''
[libdefaults]
default_realm = ATHENA.MIT.EDU
[realms]
ATHENA.MIT.EDU = {
admin_server = athena.mit.edu
kdc = athena.mit.edu
}
[domain_realm]
.example.com = EXAMPLE.COM
example.com = EXAMPLE.COM
[capaths]
ATHENA.MIT.EDU = {
EXAMPLE.COM = .
}
EXAMPLE.COM = {
ATHENA.MIT.EDU = .
}
[appdefaults]
pam = {
debug = false
initial_timeout = 1
max_timeout = 30
renew_lifetime = 36000
ticket_lifetime = 36000
timeout_shift = 2
}
[plugins]
ccselect = {
disable = k5identity
}
[logging]
kdc = SYSLOG:NOTICE
admin_server = SYSLOG:NOTICE
default = SYSLOG:NOTICE
'';
in ''
$machine->succeed("diff /etc/krb5.conf ${snapshot}");
'';
})