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# Configuration for the pwdutils suite of tools: passwd, useradd, etc.
{ config, lib, pkgs, ... }:
with lib;
let
loginDefs =
''
DEFAULT_HOME yes
SYS_UID_MIN 400
SYS_UID_MAX 499
UID_MIN 1000
UID_MAX 29999
SYS_GID_MIN 400
SYS_GID_MAX 499
GID_MIN 1000
GID_MAX 29999
TTYGROUP tty
TTYPERM 0620
# Ensure privacy for newly created home directories.
UMASK 077
# Uncomment this to allow non-root users to change their account
#information. This should be made configurable.
#CHFN_RESTRICT frwh
'';
in
{
###### interface
options = {
users.defaultUserShell = lib.mkOption {
description = ''
This option defines the default shell assigned to user
accounts. This must not be a store path, since the path is
used outside the store (in particular in /etc/passwd).
Rather, it should be the path of a symlink that points to the
actual shell in the Nix store.
'';
example = "/run/current-system/sw/bin/zsh";
type = types.path;
};
};
###### implementation
config = {
environment.systemPackages =
lib.optional config.users.mutableUsers pkgs.shadow;
environment.etc =
[ { # /etc/login.defs: global configuration for pwdutils. You
# cannot login without it!
source = pkgs.writeText "login.defs" loginDefs;
target = "login.defs";
}
{ # /etc/default/useradd: configuration for useradd.
source = pkgs.writeText "useradd"
''
GROUP=100
HOME=/home
SHELL=${config.users.defaultUserShell}
'';
target = "default/useradd";
}
];
security.pam.services =
{ chsh = { rootOK = true; };
chfn = { rootOK = true; };
su = { rootOK = true; forwardXAuth = true; logFailures = true; };
passwd = {};
# Note: useradd, groupadd etc. aren't setuid root, so it
# doesn't really matter what the PAM config says as long as it
# lets root in.
useradd = { rootOK = true; };
usermod = { rootOK = true; };
userdel = { rootOK = true; };
groupadd = { rootOK = true; };
groupmod = { rootOK = true; };
groupmems = { rootOK = true; };
groupdel = { rootOK = true; };
login = { startSession = true; allowNullPassword = true; showMotd = true; updateWtmp = true; };
chpasswd = { rootOK = true; };
chgpasswd = { rootOK = true; };
};
security.setuidPrograms = [ "passwd" "chfn" "su" "sg" "newgrp"
"newuidmap" "newgidmap" # new in shadow 4.2.x
];
};
}
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