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8c0558dbb2
sg and newgrp only changes the current user session and should be available to users even if the "users.mutableUsers" option is set. These are common, useful commands. chfn does modify the /etc/passwd GECOS field which is also controlled by the option "users.users.<name?>.description", so it's less appropriate to make it available when "users.mutableUsers" is set. However, because CHFN_RESTRICT in login.defs is never set in current NixOS the chfn functionality is never available to users anyway and may as well have its SUID disabled, as only root is able to use it. This is recommended in the chfn man page in this case.
116 lines
3.1 KiB
Nix
116 lines
3.1 KiB
Nix
# Configuration for the pwdutils suite of tools: passwd, useradd, etc.
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{ config, lib, utils, pkgs, ... }:
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with lib;
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let
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loginDefs =
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''
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DEFAULT_HOME yes
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SYS_UID_MIN 400
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SYS_UID_MAX 499
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UID_MIN 1000
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UID_MAX 29999
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SYS_GID_MIN 400
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SYS_GID_MAX 499
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GID_MIN 1000
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GID_MAX 29999
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TTYGROUP tty
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TTYPERM 0620
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# Ensure privacy for newly created home directories.
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UMASK 077
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# Uncomment this and install chfn SUID to allow non-root
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# users to change their account GECOS information.
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# This should be made configurable.
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#CHFN_RESTRICT frwh
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'';
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in
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{
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###### interface
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options = {
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users.defaultUserShell = lib.mkOption {
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description = ''
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This option defines the default shell assigned to user
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accounts. This can be either a full system path or a shell package.
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This must not be a store path, since the path is
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used outside the store (in particular in /etc/passwd).
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'';
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example = literalExample "pkgs.zsh";
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type = types.either types.path types.shellPackage;
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};
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};
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###### implementation
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config = {
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environment.systemPackages =
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lib.optional config.users.mutableUsers pkgs.shadow ++
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lib.optional (types.shellPackage.check config.users.defaultUserShell)
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config.users.defaultUserShell;
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environment.etc =
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[ { # /etc/login.defs: global configuration for pwdutils. You
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# cannot login without it!
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source = pkgs.writeText "login.defs" loginDefs;
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target = "login.defs";
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}
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{ # /etc/default/useradd: configuration for useradd.
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source = pkgs.writeText "useradd"
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''
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GROUP=100
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HOME=/home
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SHELL=${utils.toShellPath config.users.defaultUserShell}
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'';
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target = "default/useradd";
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}
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];
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security.pam.services =
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{ chsh = { rootOK = true; };
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chfn = { rootOK = true; };
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su = { rootOK = true; forwardXAuth = true; logFailures = true; };
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passwd = {};
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# Note: useradd, groupadd etc. aren't setuid root, so it
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# doesn't really matter what the PAM config says as long as it
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# lets root in.
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useradd = { rootOK = true; };
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usermod = { rootOK = true; };
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userdel = { rootOK = true; };
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groupadd = { rootOK = true; };
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groupmod = { rootOK = true; };
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groupmems = { rootOK = true; };
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groupdel = { rootOK = true; };
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login = { startSession = true; allowNullPassword = true; showMotd = true; updateWtmp = true; };
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chpasswd = { rootOK = true; };
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};
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security.wrappers = {
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su.source = "${pkgs.shadow.su}/bin/su";
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sg.source = "${pkgs.shadow.out}/bin/sg";
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newgrp.source = "${pkgs.shadow.out}/bin/newgrp";
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newuidmap.source = "${pkgs.shadow.out}/bin/newuidmap";
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newgidmap.source = "${pkgs.shadow.out}/bin/newgidmap";
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} // (if config.users.mutableUsers then {
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passwd.source = "${pkgs.shadow.out}/bin/passwd";
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} else {});
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};
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}
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