708 lines
26 KiB
Nix
708 lines
26 KiB
Nix
# This module provides configuration for the PAM (Pluggable
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# Authentication Modules) system.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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parentConfig = config;
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pamOpts = { config, name, ... }: let cfg = config; in let config = parentConfig; in {
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options = {
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name = mkOption {
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example = "sshd";
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type = types.str;
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description = "Name of the PAM service.";
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};
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unixAuth = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Whether users can log in with passwords defined in
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<filename>/etc/shadow</filename>.
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'';
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};
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rootOK = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If set, root doesn't need to authenticate (e.g. for the
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<command>useradd</command> service).
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'';
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};
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u2fAuth = mkOption {
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default = config.security.pam.u2f.enable;
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type = types.bool;
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description = ''
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If set, users listed in
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<filename>$XDG_CONFIG_HOME/Yubico/u2f_keys</filename> (or
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<filename>$HOME/.config/Yubico/u2f_keys</filename> if XDG variable is
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not set) are able to log in with the associated U2F key. Path can be
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changed using <option>security.pam.u2f.authFile</option> option.
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'';
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};
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googleAuthenticator = {
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enable = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If set, users with enabled Google Authenticator (created
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<filename>~/.google_authenticator</filename>) will be required
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to provide Google Authenticator token to log in.
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'';
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};
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};
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usbAuth = mkOption {
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default = config.security.pam.usb.enable;
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type = types.bool;
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description = ''
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If set, users listed in
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<filename>/etc/pamusb.conf</filename> are able to log in
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with the associated USB key.
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'';
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};
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otpwAuth = mkOption {
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default = config.security.pam.enableOTPW;
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type = types.bool;
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description = ''
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If set, the OTPW system will be used (if
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<filename>~/.otpw</filename> exists).
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'';
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};
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googleOsLoginAccountVerification = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If set, will use the Google OS Login PAM modules
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(<literal>pam_oslogin_login</literal>,
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<literal>pam_oslogin_admin</literal>) to verify possible OS Login
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users and set sudoers configuration accordingly.
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This only makes sense to enable for the <literal>sshd</literal> PAM
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service.
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'';
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};
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googleOsLoginAuthentication = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If set, will use the <literal>pam_oslogin_login</literal>'s user
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authentication methods to authenticate users using 2FA.
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This only makes sense to enable for the <literal>sshd</literal> PAM
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service.
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'';
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};
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fprintAuth = mkOption {
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default = config.services.fprintd.enable;
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type = types.bool;
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description = ''
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If set, fingerprint reader will be used (if exists and
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your fingerprints are enrolled).
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'';
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};
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oathAuth = mkOption {
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default = config.security.pam.oath.enable;
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type = types.bool;
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description = ''
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If set, the OATH Toolkit will be used.
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'';
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};
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sshAgentAuth = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If set, the calling user's SSH agent is used to authenticate
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against the keys in the calling user's
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<filename>~/.ssh/authorized_keys</filename>. This is useful
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for <command>sudo</command> on password-less remote systems.
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'';
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};
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startSession = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If set, the service will register a new session with
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systemd's login manager. For local sessions, this will give
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the user access to audio devices, CD-ROM drives. In the
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default PolicyKit configuration, it also allows the user to
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reboot the system.
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'';
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};
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setEnvironment = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether the service should set the environment variables
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listed in <option>environment.sessionVariables</option>
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using <literal>pam_env.so</literal>.
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'';
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};
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setLoginUid = mkOption {
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type = types.bool;
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description = ''
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Set the login uid of the process
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(<filename>/proc/self/loginuid</filename>) for auditing
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purposes. The login uid is only set by ‘entry points’ like
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<command>login</command> and <command>sshd</command>, not by
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commands like <command>sudo</command>.
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'';
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};
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forwardXAuth = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Whether X authentication keys should be passed from the
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calling user to the target user (e.g. for
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<command>su</command>)
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'';
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};
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pamMount = mkOption {
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default = config.security.pam.mount.enable;
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type = types.bool;
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description = ''
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Enable PAM mount (pam_mount) system to mount fileystems on user login.
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'';
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};
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allowNullPassword = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Whether to allow logging into accounts that have no password
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set (i.e., have an empty password field in
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<filename>/etc/passwd</filename> or
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<filename>/etc/group</filename>). This does not enable
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logging into disabled accounts (i.e., that have the password
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field set to <literal>!</literal>). Note that regardless of
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what the pam_unix documentation says, accounts with hashed
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empty passwords are always allowed to log in.
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'';
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};
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requireWheel = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Whether to permit root access only to members of group wheel.
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'';
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};
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limits = mkOption {
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description = ''
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Attribute set describing resource limits. Defaults to the
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value of <option>security.pam.loginLimits</option>.
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'';
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};
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showMotd = mkOption {
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default = false;
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type = types.bool;
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description = "Whether to show the message of the day.";
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};
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makeHomeDir = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Whether to try to create home directories for users
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with <literal>$HOME</literal>s pointing to nonexistent
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locations on session login.
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'';
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};
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updateWtmp = mkOption {
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default = false;
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type = types.bool;
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description = "Whether to update <filename>/var/log/wtmp</filename>.";
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};
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logFailures = mkOption {
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default = false;
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type = types.bool;
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description = "Whether to log authentication failures in <filename>/var/log/faillog</filename>.";
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};
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enableAppArmor = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Enable support for attaching AppArmor profiles at the
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user/group level, e.g., as part of a role based access
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control scheme.
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'';
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};
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enableKwallet = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If enabled, pam_wallet will attempt to automatically unlock the
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user's default KDE wallet upon login. If the user has no wallet named
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"kdewallet", or the login password does not match their wallet
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password, KDE will prompt separately after login.
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'';
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};
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sssdStrictAccess = mkOption {
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default = false;
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type = types.bool;
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description = "enforce sssd access control";
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};
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enableGnomeKeyring = mkOption {
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default = false;
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type = types.bool;
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description = ''
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If enabled, pam_gnome_keyring will attempt to automatically unlock the
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user's default Gnome keyring upon login. If the user login password does
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not match their keyring password, Gnome Keyring will prompt separately
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after login.
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'';
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};
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text = mkOption {
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type = types.nullOr types.lines;
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description = "Contents of the PAM service file.";
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};
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};
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config = {
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name = mkDefault name;
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setLoginUid = mkDefault cfg.startSession;
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limits = mkDefault config.security.pam.loginLimits;
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# !!! TODO: move the LDAP stuff to the LDAP module, and the
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# Samba stuff to the Samba module. This requires that the PAM
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# module provides the right hooks.
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text = mkDefault
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(''
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# Account management.
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account required pam_unix.so
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${optionalString use_ldap
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"account sufficient ${pam_ldap}/lib/security/pam_ldap.so"}
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${optionalString (config.services.sssd.enable && cfg.sssdStrictAccess==false)
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"account sufficient ${pkgs.sssd}/lib/security/pam_sss.so"}
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${optionalString (config.services.sssd.enable && cfg.sssdStrictAccess)
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"account [default=bad success=ok user_unknown=ignore] ${pkgs.sssd}/lib/security/pam_sss.so"}
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${optionalString config.krb5.enable
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"account sufficient ${pam_krb5}/lib/security/pam_krb5.so"}
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${optionalString cfg.googleOsLoginAccountVerification ''
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account [success=ok ignore=ignore default=die] ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_login.so
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account [success=ok default=ignore] ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_admin.so
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''}
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# Authentication management.
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${optionalString cfg.googleOsLoginAuthentication
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"auth [success=done perm_denied=bad default=ignore] ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_login.so"}
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${optionalString cfg.rootOK
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"auth sufficient pam_rootok.so"}
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${optionalString cfg.requireWheel
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"auth required pam_wheel.so use_uid"}
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${optionalString cfg.logFailures
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"auth required pam_tally.so"}
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${optionalString (config.security.pam.enableSSHAgentAuth && cfg.sshAgentAuth)
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"auth sufficient ${pkgs.pam_ssh_agent_auth}/libexec/pam_ssh_agent_auth.so file=~/.ssh/authorized_keys:~/.ssh/authorized_keys2:/etc/ssh/authorized_keys.d/%u"}
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${optionalString cfg.fprintAuth
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"auth sufficient ${pkgs.fprintd}/lib/security/pam_fprintd.so"}
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${let u2f = config.security.pam.u2f; in optionalString cfg.u2fAuth
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"auth ${u2f.control} ${pkgs.pam_u2f}/lib/security/pam_u2f.so ${optionalString u2f.debug "debug"} ${optionalString (u2f.authFile != null) "authfile=${u2f.authFile}"} ${optionalString u2f.interactive "interactive"} ${optionalString u2f.cue "cue"}"}
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${optionalString cfg.usbAuth
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"auth sufficient ${pkgs.pam_usb}/lib/security/pam_usb.so"}
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${let oath = config.security.pam.oath; in optionalString cfg.oathAuth
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"auth requisite ${pkgs.oathToolkit}/lib/security/pam_oath.so window=${toString oath.window} usersfile=${toString oath.usersFile} digits=${toString oath.digits}"}
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'' +
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# Modules in this block require having the password set in PAM_AUTHTOK.
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# pam_unix is marked as 'sufficient' on NixOS which means nothing will run
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# after it succeeds. Certain modules need to run after pam_unix
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# prompts the user for password so we run it once with 'required' at an
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# earlier point and it will run again with 'sufficient' further down.
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# We use try_first_pass the second time to avoid prompting password twice
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(optionalString (cfg.unixAuth &&
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(config.security.pam.enableEcryptfs
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|| cfg.pamMount
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|| cfg.enableKwallet
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|| cfg.enableGnomeKeyring
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|| cfg.googleAuthenticator.enable)) ''
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auth required pam_unix.so ${optionalString cfg.allowNullPassword "nullok"} likeauth
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${optionalString config.security.pam.enableEcryptfs
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"auth optional ${pkgs.ecryptfs}/lib/security/pam_ecryptfs.so unwrap"}
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${optionalString cfg.pamMount
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"auth optional ${pkgs.pam_mount}/lib/security/pam_mount.so"}
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${optionalString cfg.enableKwallet
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("auth optional ${pkgs.plasma5.kwallet-pam}/lib/security/pam_kwallet5.so" +
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" kwalletd=${pkgs.libsForQt5.kwallet.bin}/bin/kwalletd5")}
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${optionalString cfg.enableGnomeKeyring
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("auth optional ${pkgs.gnome3.gnome-keyring}/lib/security/pam_gnome_keyring.so")}
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${optionalString cfg.googleAuthenticator.enable
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"auth required ${pkgs.googleAuthenticator}/lib/security/pam_google_authenticator.so no_increment_hotp"}
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'') + ''
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${optionalString cfg.unixAuth
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"auth sufficient pam_unix.so ${optionalString cfg.allowNullPassword "nullok"} likeauth try_first_pass"}
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${optionalString cfg.otpwAuth
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"auth sufficient ${pkgs.otpw}/lib/security/pam_otpw.so"}
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${optionalString use_ldap
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"auth sufficient ${pam_ldap}/lib/security/pam_ldap.so use_first_pass"}
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${optionalString config.services.sssd.enable
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"auth sufficient ${pkgs.sssd}/lib/security/pam_sss.so use_first_pass"}
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${optionalString config.krb5.enable ''
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auth [default=ignore success=1 service_err=reset] ${pam_krb5}/lib/security/pam_krb5.so use_first_pass
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auth [default=die success=done] ${pam_ccreds}/lib/security/pam_ccreds.so action=validate use_first_pass
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auth sufficient ${pam_ccreds}/lib/security/pam_ccreds.so action=store use_first_pass
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''}
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auth required pam_deny.so
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# Password management.
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password sufficient pam_unix.so nullok sha512
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${optionalString config.security.pam.enableEcryptfs
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"password optional ${pkgs.ecryptfs}/lib/security/pam_ecryptfs.so"}
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${optionalString cfg.pamMount
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"password optional ${pkgs.pam_mount}/lib/security/pam_mount.so"}
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${optionalString use_ldap
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"password sufficient ${pam_ldap}/lib/security/pam_ldap.so"}
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${optionalString config.services.sssd.enable
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"password sufficient ${pkgs.sssd}/lib/security/pam_sss.so use_authtok"}
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${optionalString config.krb5.enable
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"password sufficient ${pam_krb5}/lib/security/pam_krb5.so use_first_pass"}
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${optionalString config.services.samba.syncPasswordsByPam
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"password optional ${pkgs.samba}/lib/security/pam_smbpass.so nullok use_authtok try_first_pass"}
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# Session management.
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${optionalString cfg.setEnvironment ''
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session required pam_env.so envfile=${config.system.build.pamEnvironment}
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''}
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session required pam_unix.so
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${optionalString cfg.setLoginUid
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"session ${
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if config.boot.isContainer then "optional" else "required"
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} pam_loginuid.so"}
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${optionalString cfg.makeHomeDir
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"session required ${pkgs.pam}/lib/security/pam_mkhomedir.so silent skel=${config.security.pam.makeHomeDir.skelDirectory} umask=0022"}
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${optionalString cfg.updateWtmp
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"session required ${pkgs.pam}/lib/security/pam_lastlog.so silent"}
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${optionalString config.security.pam.enableEcryptfs
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"session optional ${pkgs.ecryptfs}/lib/security/pam_ecryptfs.so"}
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${optionalString use_ldap
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"session optional ${pam_ldap}/lib/security/pam_ldap.so"}
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${optionalString config.services.sssd.enable
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"session optional ${pkgs.sssd}/lib/security/pam_sss.so"}
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${optionalString config.krb5.enable
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"session optional ${pam_krb5}/lib/security/pam_krb5.so"}
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${optionalString cfg.otpwAuth
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"session optional ${pkgs.otpw}/lib/security/pam_otpw.so"}
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${optionalString cfg.startSession
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"session optional ${pkgs.systemd}/lib/security/pam_systemd.so"}
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${optionalString cfg.forwardXAuth
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"session optional pam_xauth.so xauthpath=${pkgs.xorg.xauth}/bin/xauth systemuser=99"}
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${optionalString (cfg.limits != [])
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"session required ${pkgs.pam}/lib/security/pam_limits.so conf=${makeLimitsConf cfg.limits}"}
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${optionalString (cfg.showMotd && config.users.motd != null)
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"session optional ${pkgs.pam}/lib/security/pam_motd.so motd=${motd}"}
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${optionalString cfg.pamMount
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"session optional ${pkgs.pam_mount}/lib/security/pam_mount.so"}
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${optionalString (cfg.enableAppArmor && config.security.apparmor.enable)
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"session optional ${pkgs.apparmor-pam}/lib/security/pam_apparmor.so order=user,group,default debug"}
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${optionalString (cfg.enableKwallet)
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("session optional ${pkgs.plasma5.kwallet-pam}/lib/security/pam_kwallet5.so" +
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" kwalletd=${pkgs.libsForQt5.kwallet.bin}/bin/kwalletd5")}
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${optionalString (cfg.enableGnomeKeyring)
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"session optional ${pkgs.gnome3.gnome-keyring}/lib/security/pam_gnome_keyring.so auto_start"}
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${optionalString (config.virtualisation.lxc.lxcfs.enable)
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"session optional ${pkgs.lxc}/lib/security/pam_cgfs.so -c all"}
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'');
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};
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};
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inherit (pkgs) pam_krb5 pam_ccreds;
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use_ldap = (config.users.ldap.enable && config.users.ldap.loginPam);
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pam_ldap = if config.users.ldap.daemon.enable then pkgs.nss_pam_ldapd else pkgs.pam_ldap;
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# Create a limits.conf(5) file.
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makeLimitsConf = limits:
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pkgs.writeText "limits.conf"
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(concatMapStrings ({ domain, type, item, value }:
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"${domain} ${type} ${item} ${toString value}\n")
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limits);
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motd = pkgs.writeText "motd" config.users.motd;
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makePAMService = pamService:
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{ source = pkgs.writeText "${pamService.name}.pam" pamService.text;
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target = "pam.d/${pamService.name}";
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};
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in
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{
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|
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###### interface
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options = {
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|
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security.pam.loginLimits = mkOption {
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default = [];
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example =
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[ { domain = "ftp";
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type = "hard";
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item = "nproc";
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value = "0";
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}
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{ domain = "@student";
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type = "-";
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item = "maxlogins";
|
||
value = "4";
|
||
}
|
||
];
|
||
|
||
description =
|
||
'' Define resource limits that should apply to users or groups.
|
||
Each item in the list should be an attribute set with a
|
||
<varname>domain</varname>, <varname>type</varname>,
|
||
<varname>item</varname>, and <varname>value</varname>
|
||
attribute. The syntax and semantics of these attributes
|
||
must be that described in the limits.conf(5) man page.
|
||
|
||
Note that these limits do not apply to systemd services,
|
||
whose limits can be changed via <option>systemd.extraConfig</option>
|
||
instead.
|
||
'';
|
||
};
|
||
|
||
security.pam.services = mkOption {
|
||
default = [];
|
||
type = with types; loaOf (submodule pamOpts);
|
||
description =
|
||
''
|
||
This option defines the PAM services. A service typically
|
||
corresponds to a program that uses PAM,
|
||
e.g. <command>login</command> or <command>passwd</command>.
|
||
Each attribute of this set defines a PAM service, with the attribute name
|
||
defining the name of the service.
|
||
'';
|
||
};
|
||
|
||
security.pam.makeHomeDir.skelDirectory = mkOption {
|
||
type = types.str;
|
||
default = "/var/empty";
|
||
example = "/etc/skel";
|
||
description = ''
|
||
Path to skeleton directory whose contents are copied to home
|
||
directories newly created by <literal>pam_mkhomedir</literal>.
|
||
'';
|
||
};
|
||
|
||
security.pam.enableSSHAgentAuth = mkOption {
|
||
default = false;
|
||
description =
|
||
''
|
||
Enable sudo logins if the user's SSH agent provides a key
|
||
present in <filename>~/.ssh/authorized_keys</filename>.
|
||
This allows machines to exclusively use SSH keys instead of
|
||
passwords.
|
||
'';
|
||
};
|
||
|
||
security.pam.enableOTPW = mkOption {
|
||
default = false;
|
||
description = ''
|
||
Enable the OTPW (one-time password) PAM module.
|
||
'';
|
||
};
|
||
|
||
security.pam.u2f = {
|
||
enable = mkOption {
|
||
default = false;
|
||
type = types.bool;
|
||
description = ''
|
||
Enables U2F PAM (<literal>pam-u2f</literal>) module.
|
||
|
||
If set, users listed in
|
||
<filename>$XDG_CONFIG_HOME/Yubico/u2f_keys</filename> (or
|
||
<filename>$HOME/.config/Yubico/u2f_keys</filename> if XDG variable is
|
||
not set) are able to log in with the associated U2F key. The path can
|
||
be changed using <option>security.pam.u2f.authFile</option> option.
|
||
|
||
File format is:
|
||
<literal>username:first_keyHandle,first_public_key: second_keyHandle,second_public_key</literal>
|
||
This file can be generated using <command>pamu2fcfg</command> command.
|
||
|
||
More information can be found <link
|
||
xlink:href="https://developers.yubico.com/pam-u2f/">here</link>.
|
||
'';
|
||
};
|
||
|
||
authFile = mkOption {
|
||
default = null;
|
||
type = with types; nullOr path;
|
||
description = ''
|
||
By default <literal>pam-u2f</literal> module reads the keys from
|
||
<filename>$XDG_CONFIG_HOME/Yubico/u2f_keys</filename> (or
|
||
<filename>$HOME/.config/Yubico/u2f_keys</filename> if XDG variable is
|
||
not set).
|
||
|
||
If you want to change auth file locations or centralize database (for
|
||
example use <filename>/etc/u2f-mappings</filename>) you can set this
|
||
option.
|
||
|
||
File format is:
|
||
<literal>username:first_keyHandle,first_public_key: second_keyHandle,second_public_key</literal>
|
||
This file can be generated using <command>pamu2fcfg</command> command.
|
||
|
||
More information can be found <link
|
||
xlink:href="https://developers.yubico.com/pam-u2f/">here</link>.
|
||
'';
|
||
};
|
||
|
||
control = mkOption {
|
||
default = "sufficient";
|
||
type = types.enum [ "required" "requisite" "sufficient" "optional" ];
|
||
description = ''
|
||
This option sets pam "control".
|
||
If you want to have multi factor authentication, use "required".
|
||
If you want to use U2F device instead of regular password, use "sufficient".
|
||
|
||
Read
|
||
<citerefentry>
|
||
<refentrytitle>pam.conf</refentrytitle>
|
||
<manvolnum>5</manvolnum>
|
||
</citerefentry>
|
||
for better understanding of this option.
|
||
'';
|
||
};
|
||
|
||
debug = mkOption {
|
||
default = false;
|
||
type = types.bool;
|
||
description = ''
|
||
Debug output to stderr.
|
||
'';
|
||
};
|
||
|
||
interactive = mkOption {
|
||
default = false;
|
||
type = types.bool;
|
||
description = ''
|
||
Set to prompt a message and wait before testing the presence of a U2F device.
|
||
Recommended if your device doesn’t have a tactile trigger.
|
||
'';
|
||
};
|
||
|
||
cue = mkOption {
|
||
default = false;
|
||
type = types.bool;
|
||
description = ''
|
||
By default <literal>pam-u2f</literal> module does not inform user
|
||
that he needs to use the u2f device, it just waits without a prompt.
|
||
|
||
If you set this option to <literal>true</literal>,
|
||
<literal>cue</literal> option is added to <literal>pam-u2f</literal>
|
||
module and reminder message will be displayed.
|
||
'';
|
||
};
|
||
};
|
||
|
||
security.pam.enableEcryptfs = mkOption {
|
||
default = false;
|
||
description = ''
|
||
Enable eCryptfs PAM module (mounting ecryptfs home directory on login).
|
||
'';
|
||
};
|
||
|
||
users.motd = mkOption {
|
||
default = null;
|
||
example = "Today is Sweetmorn, the 4th day of The Aftermath in the YOLD 3178.";
|
||
type = types.nullOr types.lines;
|
||
description = "Message of the day shown to users when they log in.";
|
||
};
|
||
|
||
};
|
||
|
||
|
||
###### implementation
|
||
|
||
config = {
|
||
|
||
environment.systemPackages =
|
||
# Include the PAM modules in the system path mostly for the manpages.
|
||
[ pkgs.pam ]
|
||
++ optional config.users.ldap.enable pam_ldap
|
||
++ optional config.services.sssd.enable pkgs.sssd
|
||
++ optionals config.krb5.enable [pam_krb5 pam_ccreds]
|
||
++ optionals config.security.pam.enableOTPW [ pkgs.otpw ]
|
||
++ optionals config.security.pam.oath.enable [ pkgs.oathToolkit ]
|
||
++ optionals config.security.pam.u2f.enable [ pkgs.pam_u2f ];
|
||
|
||
boot.supportedFilesystems = optionals config.security.pam.enableEcryptfs [ "ecryptfs" ];
|
||
|
||
security.wrappers = {
|
||
unix_chkpwd = {
|
||
source = "${pkgs.pam}/sbin/unix_chkpwd.orig";
|
||
owner = "root";
|
||
setuid = true;
|
||
};
|
||
};
|
||
|
||
environment.etc =
|
||
mapAttrsToList (n: v: makePAMService v) config.security.pam.services;
|
||
|
||
systemd.tmpfiles.rules = optionals
|
||
(any (s: s.updateWtmp) (attrValues config.security.pam.services))
|
||
[
|
||
"f /var/log/wtmp"
|
||
"f /var/log/lastlog"
|
||
];
|
||
|
||
security.pam.services =
|
||
{ other.text =
|
||
''
|
||
auth required pam_warn.so
|
||
auth required pam_deny.so
|
||
account required pam_warn.so
|
||
account required pam_deny.so
|
||
password required pam_warn.so
|
||
password required pam_deny.so
|
||
session required pam_warn.so
|
||
session required pam_deny.so
|
||
'';
|
||
|
||
# Most of these should be moved to specific modules.
|
||
cups = {};
|
||
ftp = {};
|
||
i3lock = {};
|
||
i3lock-color = {};
|
||
screen = {};
|
||
vlock = {};
|
||
xlock = {};
|
||
xscreensaver = {};
|
||
|
||
runuser = { rootOK = true; unixAuth = false; setEnvironment = false; };
|
||
|
||
/* FIXME: should runuser -l start a systemd session? Currently
|
||
it complains "Cannot create session: Already running in a
|
||
session". */
|
||
runuser-l = { rootOK = true; unixAuth = false; };
|
||
};
|
||
|
||
};
|
||
|
||
}
|