infrastructure/machines/compute01/k-radius/module.nix

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{
config,
lib,
pkgs,
...
}:
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let
inherit (lib)
mkEnableOption
mkIf
mkOption
types
;
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settingsFormat = pkgs.formats.toml { };
py-pkgs = import ./packages/python { inherit pkgs; };
pykanidm = pkgs.callPackage ./packages/pykanidm.nix { inherit (py-pkgs) pydantic; };
rlm_python = pkgs.callPackage ./packages/rlm_python.nix { inherit pykanidm; };
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cfg = config.services.k-radius;
in
{
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options.services.k-radius = {
enable = mkEnableOption "a freeradius service linked to kanidm.";
settings = mkOption { inherit (settingsFormat) type; };
freeradius = mkOption {
type = types.package;
default = pkgs.freeradius.overrideAttrs (
old: {
buildInputs = (old.buildInputs or [ ]) ++ [ (pkgs.python3.withPackages (ps: [ ps.kanidm ])) ];
}
);
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};
configDir = mkOption {
type = types.path;
default = "/var/lib/radius/raddb";
description = "The path of the freeradius server configuration directory.";
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};
authTokenFile = mkOption {
type = types.path;
description = "File to the auth token for the service account.";
};
radiusClients = mkOption {
type = types.attrsOf (
types.submodule {
options = {
secret = mkOption { type = types.path; };
ipaddr = mkOption { type = types.str; };
};
}
);
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default = { };
description = "A mapping of clients and their authentication tokens.";
};
certs = {
ca = mkOption {
type = types.str;
description = "The signing CA of the RADIUS certificate.";
};
dh = mkOption {
type = types.str;
description = "The output of `openssl dhparam -in ca.pem -out dh.pem 2048`.";
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};
cert = mkOption {
type = types.str;
description = "The certificate for the RADIUS server.";
};
key = mkOption {
type = types.str;
description = "The signing key for the RADIUS certificate.";
};
};
privateKeyPasswordFile = mkOption { type = types.path; };
};
config = mkIf cfg.enable {
users = {
users.radius = {
group = "radius";
description = "Radius daemon user";
isSystemUser = true;
};
groups.radius = { };
};
services.k-radius.settings = {
ca_path = cfg.certs.ca;
radius_cert_path = cfg.certs.cert;
radius_key_path = cfg.certs.key;
radius_dh_path = cfg.certs.dh;
radius_ca_path = cfg.certs.ca;
};
systemd.services.radius = {
description = "FreeRadius server";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
wants = [ "network.target" ];
preStart = ''
cp -R ${cfg.freeradius}/etc/raddb/* ${cfg.configDir}
cp -R ${rlm_python}/etc/raddb/* ${cfg.configDir}
chmod -R u+w ${cfg.configDir}
# disable auth via methods kanidm doesn't support
rm ${cfg.configDir}/mods-available/sql
rm ${cfg.configDir}/mods-enabled/{passwd,totp}
# enable the python and cache modules
ln -nsf ${cfg.configDir}/mods-available/python3 ${cfg.configDir}/mods-enabled/python3
ln -nsf ${cfg.configDir}/sites-available/check-eap-tls ${cfg.configDir}/sites-enabled/check-eap-tls
# write the clients configuration
rm ${cfg.configDir}/clients.conf && touch ${cfg.configDir}/clients.conf
${builtins.concatStringsSep "\n" (
builtins.attrValues (
builtins.mapAttrs
(
name:
{ secret, ipaddr }:
''
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cat <<EOF >> ${cfg.configDir}/clients.conf
client ${name} {
ipaddr = ${ipaddr}
secret = $(cat "${secret}")
proto = *
}
EOF
''
)
cfg.radiusClients
)
)}
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# Copy the kanidm configuration
cat <<EOF > /var/lib/radius/kanidm.toml
auth_token = "$(cat "${cfg.authTokenFile}")"
EOF
cat ${settingsFormat.generate "kanidm.toml" cfg.settings} >> /var/lib/radius/kanidm.toml
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chmod u+w /var/lib/radius/kanidm.toml
# Copy the certificates to the correct directory
rm -rf ${cfg.configDir}/certs && mkdir -p ${cfg.configDir}/certs
cp ${cfg.certs.ca} ${cfg.configDir}/certs/ca.pem
${pkgs.openssl}/bin/openssl rehash ${cfg.configDir}/certs
cp ${cfg.certs.dh} ${cfg.configDir}/certs/dh.pem
cat ${cfg.certs.cert} ${cfg.certs.key} > ${cfg.configDir}/certs/server.pem
# Write the password of the private_key in the eap module
sed -i ${cfg.configDir}/mods-available/eap \
-e "s/whatever/$(cat "${cfg.privateKeyPasswordFile}")/"
# Check the configuration
# ${pkgs.freeradius}/bin/radiusd -C -d ${cfg.configDir} -l stdout
'';
path = [
pkgs.openssl
pkgs.gnused
];
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serviceConfig = {
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ExecStart = "${cfg.freeradius}/bin/radiusd -X -f -d ${cfg.configDir} -l stdout";
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ExecReload = [
"${cfg.freeradius}/bin/radiusd -C -d ${cfg.configDir} -l stdout"
"${pkgs.coreutils}/bin/kill -HUP $MAINPID"
];
User = "radius";
Group = "radius";
DynamicUser = true;
Restart = "on-failure";
RestartSec = 2;
LogsDirectory = "radius";
StateDirectory = "radius";
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RuntimeDirectory = "radius";
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Environment = [
"KANIDM_RLM_CONFIG=/var/lib/radius/kanidm.toml"
"PYTHONPATH=${rlm_python.pythonPath}"
];
};
};
};
}