forked from mirrors/nixpkgs
3dc6168b31
The mutableUsers feature uses `chpasswd` to set users passwords.
Passwords and their hashes were being piped into the program using
double quotes ("") to escape. This causes any `$` characters to be
expanded as shell variables. This is a serious problem because all the
password hash methods besides DES use multiple `$` in the hashes. Single
quotes ('') should be used instead to prevent shell variable expansion.
459 lines
15 KiB
Nix
459 lines
15 KiB
Nix
{pkgs, config, ...}:
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with pkgs.lib;
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let
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ids = config.ids;
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cfg = config.users;
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passwordDescription = ''
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The options <literal>hashedPassword</literal>,
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<literal>password</literal> and <literal>passwordFile</literal>
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controls what password is set for the user.
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<literal>hashedPassword</literal> overrides both
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<literal>password</literal> and <literal>passwordFile</literal>.
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<literal>password</literal> overrides <literal>passwordFile</literal>.
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If none of these three options are set, no password is assigned to
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the user, and the user will not be able to do password logins.
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If the option <literal>users.mutableUsers</literal> is true, the
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password defined in one of the three options will only be set when
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the user is created for the first time. After that, you are free to
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change the password with the ordinary user management commands. If
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<literal>users.mutableUsers</literal> is false, you cannot change
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user passwords, they will always be set according to the password
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options.
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'';
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userOpts = { name, config, ... }: {
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options = {
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name = mkOption {
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type = types.str;
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description = "The name of the user account. If undefined, the name of the attribute set will be used.";
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};
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description = mkOption {
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type = types.str;
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default = "";
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example = "Alice Q. User";
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description = ''
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A short description of the user account, typically the
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user's full name. This is actually the “GECOS” or “comment”
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field in <filename>/etc/passwd</filename>.
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'';
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};
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uid = mkOption {
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type = with types; uniq int;
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description = "The account UID.";
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};
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group = mkOption {
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type = types.str;
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default = "nogroup";
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description = "The user's primary group.";
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};
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extraGroups = mkOption {
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type = types.listOf types.str;
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default = [];
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description = "The user's auxiliary groups.";
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};
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home = mkOption {
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type = types.str;
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default = "/var/empty";
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description = "The user's home directory.";
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};
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shell = mkOption {
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type = types.str;
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default = "/run/current-system/sw/sbin/nologin";
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description = "The path to the user's shell.";
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};
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createHome = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If true, the home directory will be created automatically. If this
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option is true and the home directory already exists but is not
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owned by the user, directory owner and group will be changed to
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match the user.
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'';
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};
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useDefaultShell = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If true, the user's shell will be set to
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<literal>cfg.defaultUserShell</literal>.
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'';
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};
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hashedPassword = mkOption {
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type = with types; uniq (nullOr str);
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default = null;
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description = ''
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Specifies the (hashed) password for the user.
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${passwordDescription}
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'';
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};
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password = mkOption {
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type = with types; uniq (nullOr str);
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default = null;
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description = ''
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Specifies the (clear text) password for the user.
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Warning: do not set confidential information here
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because it is world-readable in the Nix store. This option
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should only be used for public accounts.
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${passwordDescription}
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'';
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};
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passwordFile = mkOption {
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type = with types; uniq (nullOr string);
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default = null;
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description = ''
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The path to a file that contains the user's password. The password
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file is read on each system activation. The file should contain
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exactly one line, which should be the password in an encrypted form
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that is suitable for the <literal>chpasswd -e</literal> command.
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${passwordDescription}
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'';
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};
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createUser = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Indicates if the user should be created automatically as a local user.
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Set this to false if the user for instance is an LDAP user. NixOS will
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then not modify any of the basic properties for the user account.
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'';
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};
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};
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config = {
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name = mkDefault name;
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shell = mkIf config.useDefaultShell (mkDefault cfg.defaultUserShell);
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};
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};
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groupOpts = { name, config, ... }: {
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options = {
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name = mkOption {
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type = types.str;
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description = "The name of the group. If undefined, the name of the attribute set will be used.";
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};
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gid = mkOption {
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type = with types; uniq int;
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description = "The GID of the group.";
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};
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members = mkOption {
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type = with types; listOf string;
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default = [];
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description = ''
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The user names of the group members, added to the
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<literal>/etc/group</literal> file.
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'';
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};
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};
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config = {
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name = mkDefault name;
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};
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};
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getGroup = gname:
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let
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groups = mapAttrsToList (n: g: g) (
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filterAttrs (n: g: g.name == gname) cfg.extraGroups
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);
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in
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if length groups == 1 then head groups
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else if groups == [] then throw "Group ${gname} not defined"
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else throw "Group ${gname} has multiple definitions";
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getUser = uname:
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let
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users = mapAttrsToList (n: u: u) (
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filterAttrs (n: u: u.name == uname) cfg.extraUsers
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);
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in
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if length users == 1 then head users
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else if users == [] then throw "User ${uname} not defined"
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else throw "User ${uname} has multiple definitions";
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mkGroupEntry = gname:
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let
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g = getGroup gname;
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users = mapAttrsToList (n: u: u.name) (
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filterAttrs (n: u: elem g.name u.extraGroups) cfg.extraUsers
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);
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in concatStringsSep ":" [
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g.name "x" (toString g.gid)
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(concatStringsSep "," (users ++ (filter (u: !(elem u users)) g.members)))
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];
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mkPasswdEntry = uname: let u = getUser uname; in
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concatStringsSep ":" [
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u.name "x" (toString u.uid)
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(toString (getGroup u.group).gid)
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u.description u.home u.shell
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];
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sortOn = a: sort (as1: as2: lessThan (getAttr a as1) (getAttr a as2));
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groupFile = pkgs.writeText "group" (
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concatStringsSep "\n" (map (g: mkGroupEntry g.name) (
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sortOn "gid" (attrValues cfg.extraGroups)
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))
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);
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passwdFile = pkgs.writeText "passwd" (
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concatStringsSep "\n" (map (u: mkPasswdEntry u.name) (
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sortOn "uid" (filter (u: u.createUser) (attrValues cfg.extraUsers))
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))
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);
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# If mutableUsers is true, this script adds all users/groups defined in
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# users.extra{Users,Groups} to /etc/{passwd,group} iff there isn't any
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# existing user/group with the same name in those files.
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# If mutableUsers is false, the /etc/{passwd,group} files will simply be
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# replaced with the users/groups defined in the NixOS configuration.
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# The merging procedure could certainly be improved, and instead of just
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# keeping the lines as-is from /etc/{passwd,group} they could be combined
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# in some way with the generated content from the NixOS configuration.
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merger = src: pkgs.writeScript "merger" ''
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#!${pkgs.bash}/bin/bash
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PATH=${pkgs.gawk}/bin:${pkgs.gnugrep}/bin:$PATH
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${if !cfg.mutableUsers
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then ''cp ${src} $1.tmp''
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else ''awk -F: '{ print "^"$1":.*" }' $1 | egrep -vf - ${src} | cat $1 - > $1.tmp''
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}
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# set mtime to +1, otherwise change might go unnoticed (vipw/vigr only looks at mtime)
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touch -m -t $(date -d @$(($(stat -c %Y $1)+1)) +%Y%m%d%H%M.%S) $1.tmp
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mv -f $1.tmp $1
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'';
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idsAreUnique = set: idAttr: !(fold (name: args@{ dup, acc }:
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let
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id = builtins.toString (builtins.getAttr idAttr (builtins.getAttr name set));
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exists = builtins.hasAttr id acc;
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newAcc = acc // (builtins.listToAttrs [ { name = id; value = true; } ]);
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in if dup then args else if exists
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then builtins.trace "Duplicate ${idAttr} ${id}" { dup = true; acc = null; }
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else { dup = false; acc = newAcc; }
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) { dup = false; acc = {}; } (builtins.attrNames set)).dup;
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uidsAreUnique = idsAreUnique cfg.extraUsers "uid";
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gidsAreUnique = idsAreUnique cfg.extraGroups "gid";
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in
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{
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###### interface
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options = {
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users.mutableUsers = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If true, you are free to add new users and groups to the system
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with the ordinary <literal>useradd</literal> and
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<literal>groupadd</literal> commands. On system activation, the
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existing contents of the <literal>/etc/passwd</literal> and
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<literal>/etc/group</literal> files will be merged with the
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contents generated from the <literal>users.extraUsers</literal> and
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<literal>users.extraGroups</literal> options. If
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<literal>mutableUsers</literal> is false, the contents of the user and
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group files will simply be replaced on system activation. This also
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holds for the user passwords; if this option is false, all changed
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passwords will be reset according to the
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<literal>users.extraUsers</literal> configuration on activation. If
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this option is true, the initial password for a user will be set
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according to <literal>users.extraUsers</literal>, but existing passwords
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will not be changed.
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'';
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};
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users.enforceIdUniqueness = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to require that no two users/groups share the same uid/gid.
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'';
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};
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users.extraUsers = mkOption {
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default = {};
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type = types.loaOf types.optionSet;
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example = {
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alice = {
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uid = 1234;
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description = "Alice Q. User";
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home = "/home/alice";
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createHome = true;
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group = "users";
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extraGroups = ["wheel"];
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shell = "/bin/sh";
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};
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};
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description = ''
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Additional user accounts to be created automatically by the system.
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This can also be used to set options for root.
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'';
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options = [ userOpts ];
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};
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users.extraGroups = mkOption {
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default = {};
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example =
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{ students.gid = 1001;
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hackers = { };
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};
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type = types.loaOf types.optionSet;
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description = ''
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Additional groups to be created automatically by the system.
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'';
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options = [ groupOpts ];
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};
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security.initialRootPassword = mkOption {
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type = types.str;
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default = "";
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example = "!";
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description = ''
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The (hashed) password for the root account set on initial
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installation. The empty string denotes that root can login
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locally without a password (but not via remote services such
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as SSH, or indirectly via <command>su</command> or
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<command>sudo</command>). The string <literal>!</literal>
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prevents root from logging in using a password.
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Note, setting this option sets
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<literal>users.extraUsers.root.hashedPassword</literal>.
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Note, if <literal>users.mutableUsers</literal> is false
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you cannot change the root password manually, so in that case
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the name of this option is a bit misleading, since it will define
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the root password beyond the user initialisation phase.
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'';
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};
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};
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###### implementation
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config = {
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users.extraUsers = {
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root = {
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uid = ids.uids.root;
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description = "System administrator";
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home = "/root";
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shell = cfg.defaultUserShell;
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group = "root";
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hashedPassword = config.security.initialRootPassword;
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};
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nobody = {
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uid = ids.uids.nobody;
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description = "Unprivileged account (don't use!)";
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group = "nogroup";
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};
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};
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users.extraGroups = {
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root.gid = ids.gids.root;
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wheel.gid = ids.gids.wheel;
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disk.gid = ids.gids.disk;
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kmem.gid = ids.gids.kmem;
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tty.gid = ids.gids.tty;
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floppy.gid = ids.gids.floppy;
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uucp.gid = ids.gids.uucp;
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lp.gid = ids.gids.lp;
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cdrom.gid = ids.gids.cdrom;
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tape.gid = ids.gids.tape;
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audio.gid = ids.gids.audio;
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video.gid = ids.gids.video;
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dialout.gid = ids.gids.dialout;
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nogroup.gid = ids.gids.nogroup;
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users.gid = ids.gids.users;
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nixbld.gid = ids.gids.nixbld;
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utmp.gid = ids.gids.utmp;
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adm.gid = ids.gids.adm;
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};
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system.activationScripts.users =
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let
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mkhomeUsers = filterAttrs (n: u: u.createHome) cfg.extraUsers;
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setpwUsers = filterAttrs (n: u: u.createUser) cfg.extraUsers;
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setpw = n: u: ''
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setpw=yes
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${optionalString cfg.mutableUsers ''
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test "$(getent shadow '${u.name}' | cut -d: -f2)" != "x" && setpw=no
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''}
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if [ "$setpw" == "yes" ]; then
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${if !(isNull u.hashedPassword)
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then ''
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echo '${u.name}:${u.hashedPassword}' | \
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${pkgs.shadow}/sbin/chpasswd -e''
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else if u.password == ""
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then "passwd -d '${u.name}' &>/dev/null"
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else if !(isNull u.password)
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then ''
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echo '${u.name}:${u.password}' | ${pkgs.shadow}/sbin/chpasswd''
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else if !(isNull u.passwordFile)
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then ''
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echo -n "${u.name}:" | cat - "${u.passwordFile}" | \
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${pkgs.shadow}/sbin/chpasswd -e
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''
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else "passwd -l '${u.name}' &>/dev/null"
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}
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fi
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'';
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mkhome = n: u:
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let
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uid = toString u.uid;
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gid = toString ((getGroup u.group).gid);
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h = u.home;
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in ''
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test -a "${h}" || mkdir -p "${h}" || true
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test "$(stat -c %u "${h}")" = ${uid} || chown ${uid} "${h}" || true
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test "$(stat -c %g "${h}")" = ${gid} || chgrp ${gid} "${h}" || true
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'';
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in stringAfter [ "etc" ] ''
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touch /etc/group
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touch /etc/passwd
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VISUAL=${merger groupFile} ${pkgs.shadow}/sbin/vigr &>/dev/null
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VISUAL=${merger passwdFile} ${pkgs.shadow}/sbin/vipw &>/dev/null
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${pkgs.shadow}/sbin/grpconv
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${pkgs.shadow}/sbin/pwconv
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${concatStrings (mapAttrsToList mkhome mkhomeUsers)}
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${concatStrings (mapAttrsToList setpw setpwUsers)}
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'';
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# for backwards compatibility
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system.activationScripts.groups = stringAfter [ "users" ] "";
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assertions = [ { assertion = !cfg.enforceIdUniqueness || (uidsAreUnique && gidsAreUnique); message = "uids and gids must be unique!"; } ];
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};
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}
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