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nixos/geoipupdate: Improve secret handling

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Make secret replacement more robust and futureproof:

- Allow any attribute in `services.geoipupdate.settings` to be a
  secret if set to `{ _secret = "/path/to/secret"; }`.

- Hash the license key path before using it as a placeholder in the
  config file to minimize the risk of conflicting file paths being
  replaced instead.
This commit is contained in:
talyz 2022-03-28 15:05:26 +02:00
parent 23c15323ce
commit 4dddca8240
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GPG Key ID: 2DED2151F4671A2B
1 changed files with 40 additions and 7 deletions
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47
nixos/modules/services/misc/geoipupdate.nix
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@ -2,6 +2,7 @@
let
cfg = config.services.geoipupdate;
inherit (builtins) isAttrs isString isInt isList typeOf hashString;
in
{
imports = [
@ -27,11 +28,30 @@ in
};
settings = lib.mkOption {
example = lib.literalExpression ''
{
AccountID = 200001;
DatabaseDirectory = "/var/lib/GeoIP";
LicenseKey = { _secret = "/run/keys/maxmind_license_key"; };
Proxy = "10.0.0.10:8888";
ProxyUserPassword = { _secret = "/run/keys/proxy_pass"; };
}
'';
description = ''
<productname>geoipupdate</productname> configuration
options. See
<link xlink:href="https://github.com/maxmind/geoipupdate/blob/main/doc/GeoIP.conf.md" />
for a full list of available options.
Settings containing secret data should be set to an
attribute set containing the attribute
<literal>_secret</literal> - 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
<filename>GeoIP.conf</filename> file, the
<literal>ProxyUserPassword</literal> key will be set to the
contents of the
<filename>/run/keys/proxy_pass</filename> file.
'';
type = lib.types.submodule {
freeformType =
@ -65,11 +85,18 @@ in
};
LicenseKey = lib.mkOption {
type = lib.types.path;
type = with lib.types; either path (attrsOf path);
description = ''
A file containing the <productname>MaxMind</productname>
license key.
A file containing the
<productname>MaxMind</productname> license key.
Always handled as a secret whether the value is
wrapped in a <literal>{ _secret = ...; }</literal>
attrset or not (refer to <xref
linkend="opt-services.geoipupdate.settings" /> for
details).
'';
apply = x: if isAttrs x then x else { _secret = x; };
};
DatabaseDirectory = lib.mkOption {
@ -118,22 +145,30 @@ in
"network-online.target"
"nss-lookup.target"
];
path = [ pkgs.replace-secret ];
wants = [ "network-online.target" ];
startAt = cfg.interval;
serviceConfig = {
ExecStartPre =
let
isSecret = v: isAttrs v && v ? _secret && isString v._secret;
geoipupdateKeyValue = lib.generators.toKeyValue {
mkKeyValue = lib.flip lib.generators.mkKeyValueDefault " " rec {
mkValueString = v: with builtins;
mkValueString = v:
if isInt v then toString v
else if isString v then v
else if true == v then "1"
else if false == v then "0"
else if isList v then lib.concatMapStringsSep " " mkValueString v
else if isSecret v then hashString "sha256" v._secret
else throw "unsupported type ${typeOf v}: ${(lib.generators.toPretty {}) v}";
};
};
secretPaths = lib.catAttrs "_secret" (lib.collect isSecret cfg.settings);
mkSecretReplacement = file: ''
replace-secret ${lib.escapeShellArgs [ (hashString "sha256" file) file "/run/geoipupdate/GeoIP.conf" ]}
'';
secretReplacements = lib.concatMapStrings mkSecretReplacement secretPaths;
geoipupdateConf = pkgs.writeText "geoipupdate.conf" (geoipupdateKeyValue cfg.settings);
@ -144,9 +179,7 @@ in
chown geoip "${cfg.settings.DatabaseDirectory}"
cp ${geoipupdateConf} /run/geoipupdate/GeoIP.conf
${pkgs.replace-secret}/bin/replace-secret '${cfg.settings.LicenseKey}' \
'${cfg.settings.LicenseKey}' \
/run/geoipupdate/GeoIP.conf
${secretReplacements}
'';
in
"+${pkgs.writeShellScript "start-pre-full-privileges" script}";