nixpkgs/nixos/modules/services/web-apps/keycloak.nix
Benjamin Staffin 64c94bd40a nixos/keycloak: Add systemd startup notification
This makes it possible for other systemd units to depend on
keycloak.service using `after` and `wants` relationships, and systemd
will actually wait for Keycloak to finish its initialization before
starting any dependent units.  This can be important for services like
oauth2-proxy, which (when configured to use Keycloak as its auth
provider) will fail to start until Keycloak's
`.well-known/openid-configuration` endpoint is available.
2024-05-14 14:26:35 -04:00

685 lines
24 KiB
Nix

{ config, options, pkgs, lib, ... }:
let
cfg = config.services.keycloak;
opt = options.services.keycloak;
inherit (lib)
types
mkMerge
mkOption
mkChangedOptionModule
mkRenamedOptionModule
mkRemovedOptionModule
mkPackageOption
concatStringsSep
mapAttrsToList
escapeShellArg
mkIf
optionalString
optionals
mkDefault
literalExpression
isAttrs
literalMD
maintainers
catAttrs
collect
hasPrefix
;
inherit (builtins)
elem
typeOf
isInt
isString
hashString
isPath
;
prefixUnlessEmpty = prefix: string: optionalString (string != "") "${prefix}${string}";
in
{
imports =
[
(mkRenamedOptionModule
[ "services" "keycloak" "bindAddress" ]
[ "services" "keycloak" "settings" "http-host" ])
(mkRenamedOptionModule
[ "services" "keycloak" "forceBackendUrlToFrontendUrl"]
[ "services" "keycloak" "settings" "hostname-strict-backchannel"])
(mkChangedOptionModule
[ "services" "keycloak" "httpPort" ]
[ "services" "keycloak" "settings" "http-port" ]
(config:
builtins.fromJSON config.services.keycloak.httpPort))
(mkChangedOptionModule
[ "services" "keycloak" "httpsPort" ]
[ "services" "keycloak" "settings" "https-port" ]
(config:
builtins.fromJSON config.services.keycloak.httpsPort))
(mkRemovedOptionModule
[ "services" "keycloak" "frontendUrl" ]
''
Set `services.keycloak.settings.hostname' and `services.keycloak.settings.http-relative-path' instead.
NOTE: You likely want to set 'http-relative-path' to '/auth' to keep compatibility with your clients.
See its description for more information.
'')
(mkRemovedOptionModule
[ "services" "keycloak" "extraConfig" ]
"Use `services.keycloak.settings' instead.")
];
options.services.keycloak =
let
inherit (types)
bool
str
int
nullOr
attrsOf
oneOf
path
enum
package
port;
assertStringPath = optionName: value:
if isPath value then
throw ''
services.keycloak.${optionName}:
${toString value}
is a Nix path, but should be a string, since Nix
paths are copied into the world-readable Nix store.
''
else value;
in
{
enable = mkOption {
type = bool;
default = false;
example = true;
description = ''
Whether to enable the Keycloak identity and access management
server.
'';
};
sslCertificate = mkOption {
type = nullOr path;
default = null;
example = "/run/keys/ssl_cert";
apply = assertStringPath "sslCertificate";
description = ''
The path to a PEM formatted certificate to use for TLS/SSL
connections.
'';
};
sslCertificateKey = mkOption {
type = nullOr path;
default = null;
example = "/run/keys/ssl_key";
apply = assertStringPath "sslCertificateKey";
description = ''
The path to a PEM formatted private key to use for TLS/SSL
connections.
'';
};
plugins = lib.mkOption {
type = lib.types.listOf lib.types.path;
default = [ ];
description = ''
Keycloak plugin jar, ear files or derivations containing
them. Packaged plugins are available through
`pkgs.keycloak.plugins`.
'';
};
database = {
type = mkOption {
type = enum [ "mysql" "mariadb" "postgresql" ];
default = "postgresql";
example = "mariadb";
description = ''
The type of database Keycloak should connect to.
'';
};
host = mkOption {
type = str;
default = "localhost";
description = ''
Hostname of the database to connect to.
'';
};
port =
let
dbPorts = {
postgresql = 5432;
mariadb = 3306;
mysql = 3306;
};
in
mkOption {
type = port;
default = dbPorts.${cfg.database.type};
defaultText = literalMD "default port of selected database";
description = ''
Port of the database to connect to.
'';
};
useSSL = mkOption {
type = bool;
default = cfg.database.host != "localhost";
defaultText = literalExpression ''config.${opt.database.host} != "localhost"'';
description = ''
Whether the database connection should be secured by SSL /
TLS.
'';
};
caCert = mkOption {
type = nullOr path;
default = null;
description = ''
The SSL / TLS CA certificate that verifies the identity of the
database server.
Required when PostgreSQL is used and SSL is turned on.
For MySQL, if left at `null`, the default
Java keystore is used, which should suffice if the server
certificate is issued by an official CA.
'';
};
createLocally = mkOption {
type = bool;
default = true;
description = ''
Whether a database should be automatically created on the
local host. Set this to false if you plan on provisioning a
local database yourself. This has no effect if
services.keycloak.database.host is customized.
'';
};
name = mkOption {
type = str;
default = "keycloak";
description = ''
Database name to use when connecting to an external or
manually provisioned database; has no effect when a local
database is automatically provisioned.
To use this with a local database, set [](#opt-services.keycloak.database.createLocally) to
`false` and create the database and user
manually.
'';
};
username = mkOption {
type = str;
default = "keycloak";
description = ''
Username to use when connecting to an external or manually
provisioned database; has no effect when a local database is
automatically provisioned.
To use this with a local database, set [](#opt-services.keycloak.database.createLocally) to
`false` and create the database and user
manually.
'';
};
passwordFile = mkOption {
type = path;
example = "/run/keys/db_password";
apply = assertStringPath "passwordFile";
description = ''
The path to a file containing the database password.
'';
};
};
package = mkPackageOption pkgs "keycloak" { };
initialAdminPassword = mkOption {
type = str;
default = "changeme";
description = ''
Initial password set for the `admin`
user. The password is not stored safely and should be changed
immediately in the admin panel.
'';
};
themes = mkOption {
type = attrsOf package;
default = { };
description = ''
Additional theme packages for Keycloak. Each theme is linked into
subdirectory with a corresponding attribute name.
Theme packages consist of several subdirectories which provide
different theme types: for example, `account`,
`login` etc. After adding a theme to this option you
can select it by its name in Keycloak administration console.
'';
};
settings = mkOption {
type = lib.types.submodule {
freeformType = attrsOf (nullOr (oneOf [ str int bool (attrsOf path) ]));
options = {
http-host = mkOption {
type = str;
default = "0.0.0.0";
example = "127.0.0.1";
description = ''
On which address Keycloak should accept new connections.
'';
};
http-port = mkOption {
type = port;
default = 80;
example = 8080;
description = ''
On which port Keycloak should listen for new HTTP connections.
'';
};
https-port = mkOption {
type = port;
default = 443;
example = 8443;
description = ''
On which port Keycloak should listen for new HTTPS connections.
'';
};
http-relative-path = mkOption {
type = str;
default = "/";
example = "/auth";
apply = x: if !(hasPrefix "/") x then "/" + x else x;
description = ''
The path relative to `/` for serving
resources.
::: {.note}
In versions of Keycloak using Wildfly (<17),
this defaulted to `/auth`. If
upgrading from the Wildfly version of Keycloak,
i.e. a NixOS version before 22.05, you'll likely
want to set this to `/auth` to
keep compatibility with your clients.
See <https://www.keycloak.org/migration/migrating-to-quarkus>
for more information on migrating from Wildfly to Quarkus.
:::
'';
};
hostname = mkOption {
type = nullOr str;
default = null;
example = "keycloak.example.com";
description = ''
The hostname part of the public URL used as base for
all frontend requests.
See <https://www.keycloak.org/server/hostname>
for more information about hostname configuration.
'';
};
hostname-strict-backchannel = mkOption {
type = bool;
default = false;
example = true;
description = ''
Whether Keycloak should force all requests to go
through the frontend URL. By default, Keycloak allows
backend requests to instead use its local hostname or
IP address and may also advertise it to clients
through its OpenID Connect Discovery endpoint.
See <https://www.keycloak.org/server/hostname>
for more information about hostname configuration.
'';
};
proxy = mkOption {
type = enum [ "edge" "reencrypt" "passthrough" "none" ];
default = "none";
example = "edge";
description = ''
The proxy address forwarding mode if the server is
behind a reverse proxy.
- `edge`:
Enables communication through HTTP between the
proxy and Keycloak.
- `reencrypt`:
Requires communication through HTTPS between the
proxy and Keycloak.
- `passthrough`:
Enables communication through HTTP or HTTPS between
the proxy and Keycloak.
See <https://www.keycloak.org/server/reverseproxy> for more information.
'';
};
};
};
example = literalExpression ''
{
hostname = "keycloak.example.com";
proxy = "reencrypt";
https-key-store-file = "/path/to/file";
https-key-store-password = { _secret = "/run/keys/store_password"; };
}
'';
description = ''
Configuration options corresponding to parameters set in
{file}`conf/keycloak.conf`.
Most available options are documented at <https://www.keycloak.org/server/all-config>.
Options containing secret data should be set to an attribute
set containing the attribute `_secret` - a
string pointing to a file containing the value the option
should be set to. See the example to get a better picture of
this: in the resulting
{file}`conf/keycloak.conf` file, the
`https-key-store-password` key will be set
to the contents of the
{file}`/run/keys/store_password` file.
'';
};
};
config =
let
# We only want to create a database if we're actually going to
# connect to it.
databaseActuallyCreateLocally = cfg.database.createLocally && cfg.database.host == "localhost";
createLocalPostgreSQL = databaseActuallyCreateLocally && cfg.database.type == "postgresql";
createLocalMySQL = databaseActuallyCreateLocally && elem cfg.database.type [ "mysql" "mariadb" ];
mySqlCaKeystore = pkgs.runCommand "mysql-ca-keystore" { } ''
${pkgs.jre}/bin/keytool -importcert -trustcacerts -alias MySQLCACert -file ${cfg.database.caCert} -keystore $out -storepass notsosecretpassword -noprompt
'';
# Both theme and theme type directories need to be actual
# directories in one hierarchy to pass Keycloak checks.
themesBundle = pkgs.runCommand "keycloak-themes" { } ''
linkTheme() {
theme="$1"
name="$2"
mkdir "$out/$name"
for typeDir in "$theme"/*; do
if [ -d "$typeDir" ]; then
type="$(basename "$typeDir")"
mkdir "$out/$name/$type"
for file in "$typeDir"/*; do
ln -sn "$file" "$out/$name/$type/$(basename "$file")"
done
fi
done
}
mkdir -p "$out"
for theme in ${keycloakBuild}/themes/*; do
if [ -d "$theme" ]; then
linkTheme "$theme" "$(basename "$theme")"
fi
done
${concatStringsSep "\n" (mapAttrsToList (name: theme: "linkTheme ${theme} ${escapeShellArg name}") cfg.themes)}
'';
keycloakConfig = lib.generators.toKeyValue {
mkKeyValue = lib.flip lib.generators.mkKeyValueDefault "=" {
mkValueString = v:
if isInt v then toString v
else if isString v then v
else if true == v then "true"
else if false == v then "false"
else if isSecret v then hashString "sha256" v._secret
else throw "unsupported type ${typeOf v}: ${(lib.generators.toPretty {}) v}";
};
};
isSecret = v: isAttrs v && v ? _secret && isString v._secret;
filteredConfig = lib.converge (lib.filterAttrsRecursive (_: v: ! elem v [{ } null])) cfg.settings;
confFile = pkgs.writeText "keycloak.conf" (keycloakConfig filteredConfig);
keycloakBuild = cfg.package.override {
inherit confFile;
plugins = cfg.package.enabledPlugins ++ cfg.plugins ++
(with cfg.package.plugins; [quarkus-systemd-notify quarkus-systemd-notify-deployment]);
};
in
mkIf cfg.enable
{
assertions = [
{
assertion = (cfg.database.useSSL && cfg.database.type == "postgresql") -> (cfg.database.caCert != null);
message = "A CA certificate must be specified (in 'services.keycloak.database.caCert') when PostgreSQL is used with SSL";
}
{
assertion = createLocalPostgreSQL -> config.services.postgresql.settings.standard_conforming_strings or true;
message = "Setting up a local PostgreSQL db for Keycloak requires `standard_conforming_strings` turned on to work reliably";
}
{
assertion = cfg.settings.hostname != null || cfg.settings.hostname-url or null != null;
message = "Setting the Keycloak hostname is required, see `services.keycloak.settings.hostname`";
}
{
assertion = !(cfg.settings.hostname != null && cfg.settings.hostname-url or null != null);
message = "`services.keycloak.settings.hostname` and `services.keycloak.settings.hostname-url` are mutually exclusive";
}
];
environment.systemPackages = [ keycloakBuild ];
services.keycloak.settings =
let
postgresParams = concatStringsSep "&" (
optionals cfg.database.useSSL [
"ssl=true"
] ++ optionals (cfg.database.caCert != null) [
"sslrootcert=${cfg.database.caCert}"
"sslmode=verify-ca"
]
);
mariadbParams = concatStringsSep "&" ([
"characterEncoding=UTF-8"
] ++ optionals cfg.database.useSSL [
"useSSL=true"
"requireSSL=true"
"verifyServerCertificate=true"
] ++ optionals (cfg.database.caCert != null) [
"trustCertificateKeyStoreUrl=file:${mySqlCaKeystore}"
"trustCertificateKeyStorePassword=notsosecretpassword"
]);
dbProps = if cfg.database.type == "postgresql" then postgresParams else mariadbParams;
in
mkMerge [
{
db = if cfg.database.type == "postgresql" then "postgres" else cfg.database.type;
db-username = if databaseActuallyCreateLocally then "keycloak" else cfg.database.username;
db-password._secret = cfg.database.passwordFile;
db-url-host = cfg.database.host;
db-url-port = toString cfg.database.port;
db-url-database = if databaseActuallyCreateLocally then "keycloak" else cfg.database.name;
db-url-properties = prefixUnlessEmpty "?" dbProps;
db-url = null;
}
(mkIf (cfg.sslCertificate != null && cfg.sslCertificateKey != null) {
https-certificate-file = "/run/keycloak/ssl/ssl_cert";
https-certificate-key-file = "/run/keycloak/ssl/ssl_key";
})
];
systemd.services.keycloakPostgreSQLInit = mkIf createLocalPostgreSQL {
after = [ "postgresql.service" ];
before = [ "keycloak.service" ];
bindsTo = [ "postgresql.service" ];
path = [ config.services.postgresql.package ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
User = "postgres";
Group = "postgres";
LoadCredential = [ "db_password:${cfg.database.passwordFile}" ];
};
script = ''
set -o errexit -o pipefail -o nounset -o errtrace
shopt -s inherit_errexit
create_role="$(mktemp)"
trap 'rm -f "$create_role"' EXIT
# Read the password from the credentials directory and
# escape any single quotes by adding additional single
# quotes after them, following the rules laid out here:
# https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-CONSTANTS
db_password="$(<"$CREDENTIALS_DIRECTORY/db_password")"
db_password="''${db_password//\'/\'\'}"
echo "CREATE ROLE keycloak WITH LOGIN PASSWORD '$db_password' CREATEDB" > "$create_role"
psql -tAc "SELECT 1 FROM pg_roles WHERE rolname='keycloak'" | grep -q 1 || psql -tA --file="$create_role"
psql -tAc "SELECT 1 FROM pg_database WHERE datname = 'keycloak'" | grep -q 1 || psql -tAc 'CREATE DATABASE "keycloak" OWNER "keycloak"'
'';
};
systemd.services.keycloakMySQLInit = mkIf createLocalMySQL {
after = [ "mysql.service" ];
before = [ "keycloak.service" ];
bindsTo = [ "mysql.service" ];
path = [ config.services.mysql.package ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
User = config.services.mysql.user;
Group = config.services.mysql.group;
LoadCredential = [ "db_password:${cfg.database.passwordFile}" ];
};
script = ''
set -o errexit -o pipefail -o nounset -o errtrace
shopt -s inherit_errexit
# Read the password from the credentials directory and
# escape any single quotes by adding additional single
# quotes after them, following the rules laid out here:
# https://dev.mysql.com/doc/refman/8.0/en/string-literals.html
db_password="$(<"$CREDENTIALS_DIRECTORY/db_password")"
db_password="''${db_password//\'/\'\'}"
( echo "SET sql_mode = 'NO_BACKSLASH_ESCAPES';"
echo "CREATE USER IF NOT EXISTS 'keycloak'@'localhost' IDENTIFIED BY '$db_password';"
echo "CREATE DATABASE IF NOT EXISTS keycloak CHARACTER SET utf8 COLLATE utf8_unicode_ci;"
echo "GRANT ALL PRIVILEGES ON keycloak.* TO 'keycloak'@'localhost';"
) | mysql -N
'';
};
systemd.services.keycloak =
let
databaseServices =
if createLocalPostgreSQL then [
"keycloakPostgreSQLInit.service"
"postgresql.service"
]
else if createLocalMySQL then [
"keycloakMySQLInit.service"
"mysql.service"
]
else [ ];
secretPaths = catAttrs "_secret" (collect isSecret cfg.settings);
mkSecretReplacement = file: ''
replace-secret ${hashString "sha256" file} $CREDENTIALS_DIRECTORY/${baseNameOf file} /run/keycloak/conf/keycloak.conf
'';
secretReplacements = lib.concatMapStrings mkSecretReplacement secretPaths;
in
{
after = databaseServices;
bindsTo = databaseServices;
wantedBy = [ "multi-user.target" ];
path = with pkgs; [
keycloakBuild
openssl
replace-secret
];
environment = {
KC_HOME_DIR = "/run/keycloak";
KC_CONF_DIR = "/run/keycloak/conf";
};
serviceConfig = {
LoadCredential =
map (p: "${baseNameOf p}:${p}") secretPaths
++ optionals (cfg.sslCertificate != null && cfg.sslCertificateKey != null) [
"ssl_cert:${cfg.sslCertificate}"
"ssl_key:${cfg.sslCertificateKey}"
];
User = "keycloak";
Group = "keycloak";
DynamicUser = true;
RuntimeDirectory = "keycloak";
RuntimeDirectoryMode = "0700";
AmbientCapabilities = "CAP_NET_BIND_SERVICE";
Type = "notify"; # Requires quarkus-systemd-notify plugin
NotifyAccess = "all";
};
script = ''
set -o errexit -o pipefail -o nounset -o errtrace
shopt -s inherit_errexit
umask u=rwx,g=,o=
ln -s ${themesBundle} /run/keycloak/themes
ln -s ${keycloakBuild}/providers /run/keycloak/
install -D -m 0600 ${confFile} /run/keycloak/conf/keycloak.conf
${secretReplacements}
# Escape any backslashes in the db parameters, since
# they're otherwise unexpectedly read as escape
# sequences.
sed -i '/db-/ s|\\|\\\\|g' /run/keycloak/conf/keycloak.conf
'' + optionalString (cfg.sslCertificate != null && cfg.sslCertificateKey != null) ''
mkdir -p /run/keycloak/ssl
cp $CREDENTIALS_DIRECTORY/ssl_{cert,key} /run/keycloak/ssl/
'' + ''
export KEYCLOAK_ADMIN=admin
export KEYCLOAK_ADMIN_PASSWORD=${escapeShellArg cfg.initialAdminPassword}
kc.sh --verbose start --optimized
'';
};
services.postgresql.enable = mkDefault createLocalPostgreSQL;
services.mysql.enable = mkDefault createLocalMySQL;
services.mysql.package =
let
dbPkg = if cfg.database.type == "mariadb" then pkgs.mariadb else pkgs.mysql80;
in
mkIf createLocalMySQL (mkDefault dbPkg);
};
meta.doc = ./keycloak.md;
meta.maintainers = [ maintainers.talyz ];
}