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{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.krebs.shadow;
mergeShadowsJq = pkgs.writeJq "merge-shadows.jq" ''
def is_int: . == (. | floor);
def fields_4_to_9: ["", "", "", "", "", ""];
def check_fields_3_to_9: (.[2] | tonumber | is_int) and .[3:] == fields_4_to_9;
def read_value:
split(":") |
if length == 9 then
if check_fields_3_to_9 then
.
else
error("unrecognized field contents")
end
elif length == 2 then
if .[1] | test("^\\$6\\$") then
. + ["1"] + fields_4_to_9
else
error("unrecognized hashed password")
end
else
error("unexpected field count: expected 9 or 2, got \(length)")
end;
def write_value:
join(":");
split("\n") |
map(select(length > 0) | read_value) |
reverse |
unique_by(.[0]) |
map(write_value) |
sort |
join("\n")
'';
in {
options.krebs.shadow = {
enable = mkEnableOption "krebs.shadow" // {
default = cfg.overridesFile != null;
};
overridesFile = mkOption {
apply = x: if builtins.typeOf x == "path" then toString x else x;
default = null;
description = ''
Path to a file containing additional shadow entries, used for adding
encrypted passwords which should not be placed into the Nix store.
The overrides file may contain either regular shadow(5) entries like:
<code>‹login-name›:‹hashed-password›:1::::::</code>
Or shortened entries only containing login name and password like:
<code>‹login-name›:‹hashed-password›</code>
'';
type = types.nullOr (types.either types.path types.absolute-pathname);
};
};
config = let
in mkIf cfg.enable {
system.activationScripts.users-tv = stringAfter [ "users" ] /* sh */ ''
(
set -efu
umask 77
${pkgs.jq}/bin/jq -Rrs -f ${mergeShadowsJq} \
/etc/shadow ${cfg.overridesFile} > /etc/shadow~
${pkgs.coreutils}/bin/mv /etc/shadow /etc/shadow-
${pkgs.coreutils}/bin/mv /etc/shadow~ /etc/shadow
)
'';
};
}
|
