80 lines
2.0 KiB
Nix
80 lines
2.0 KiB
Nix
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with import <stockholm/lib>;
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{ config, pkgs, ... }: let
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cfg = config.krebs.shadow;
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mergeShadowsJq = pkgs.writeJq "merge-shadows.jq" ''
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def fields_3_to_9: ["1", "", "", "", "", "", ""];
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def read_value:
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split(":") |
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if length == 9 then
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if .[2:] == fields_3_to_9 then
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.
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else
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error("unrecognized field contents")
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end
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elif length == 2 then
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if .[1] | test("^\\$6\\$") then
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. + fields_3_to_9
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else
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error("unrecognized hashed password")
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end
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else
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error("unexpected field count: expected 9 or 2, got \(length)")
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end;
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def write_value:
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join(":");
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split("\n") |
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map(select(length > 0) | read_value) |
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reverse |
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unique_by(.[0]) |
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map(write_value) |
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sort |
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join("\n")
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'';
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in {
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options.krebs.shadow = {
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enable = mkEnableOption "krebs.shadow" // {
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default = cfg.overridesFile != null;
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};
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overridesFile = mkOption {
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apply = x: if typeOf x == "path" then toString x else x;
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default = null;
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description = ''
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Path to a file containing additional shadow entries, used for adding
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encrypted passwords which should not be placed into the Nix store.
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The overrides file may contain either regular shadow(5) entries like:
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<code><login-name>:<hashed-password>:1::::::</code>
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Or shortened entries only containing login name and password like:
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<code><login-name>:<hashed-password></code>
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'';
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type = types.nullOr (types.either types.path types.absolute-pathname);
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};
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};
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config = let
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in mkIf cfg.enable {
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system.activationScripts.users-tv = stringAfter [ "users" ] /* sh */ ''
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(
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set -efu
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umask 77
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${pkgs.jq}/bin/jq -Rrs -f ${mergeShadowsJq} \
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/etc/shadow ${cfg.overridesFile} > /etc/shadow~
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${pkgs.coreutils}/bin/mv /etc/shadow /etc/shadow-
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${pkgs.coreutils}/bin/mv /etc/shadow~ /etc/shadow
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)
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'';
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};
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}
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