9300b4903f
This reverts commit1010271c63. This reverts commite85e51d41f. The first commit causes multiple regressions. The second commit tries to fix the regressions, but does not catch all of them. There are multiple failing tests, one of which is blocking a package update. That is not acceptable for a cosmetic patch.
503 lines
18 KiB
Nix
503 lines
18 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.enableU2F;
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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>~/.yubico/u2f_keys</filename> are able to log in
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with the associated U2F key.
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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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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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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 sufficient 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.krb5.enable
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"account sufficient ${pam_krb5}/lib/security/pam_krb5.so"}
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# Authentication management.
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${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 ${pkgs.fprintd}/lib/security/pam_fprintd.so"}
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${optionalString cfg.u2fAuth
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"auth sufficient ${pkgs.pam_u2f}/lib/security/pam_u2f.so"}
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${optionalString cfg.usbAuth
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"auth sufficient ${pkgs.pam_usb}/lib/security/pam_usb.so"}
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'' +
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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 && (config.security.pam.enableEcryptfs || cfg.pamMount)) ''
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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 ${pkgs.pam_mount}/lib/security/pam_mount.so"}
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'') + ''
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${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 ${pkgs.otpw}/lib/security/pam_otpw.so"}
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${let oath = config.security.pam.oath; in optionalString cfg.oathAuth
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"auth sufficient ${pkgs.oathToolkit}/lib/security/pam_oath.so window=${toString oath.window} usersfile=${toString oath.usersFile} digits=${toString oath.digits}"}
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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.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 ${pam_ccreds}/lib/security/pam_ccreds.so action=store use_first_pass
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''}
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auth required pam_deny.so
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# Password management.
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password requisite pam_unix.so nullok sha512
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${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.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 ${pkgs.pam}/lib/security/pam_mkhomedir.so silent skel=/etc/skel umask=0022"}
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${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.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 ${pkgs.apparmor-pam}/lib/security/pam_apparmor.so order=user,group,default debug"}
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'');
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};
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};
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inherit (pkgs) pam_krb5 pam_ccreds;
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use_ldap = (config.users.ldap.enable && config.users.ldap.loginPam);
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pam_ldap = if config.users.ldap.daemon.enable then pkgs.nss_pam_ldapd else pkgs.pam_ldap;
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# Create a limits.conf(5) file.
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makeLimitsConf = limits:
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pkgs.writeText "limits.conf"
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(concatMapStrings ({ domain, type, item, value }:
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"${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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###### interface
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options = {
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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";
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value = "4";
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}
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];
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description =
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'' Define resource limits that should apply to users or groups.
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Each item in the list should be an attribute set with a
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<varname>domain</varname>, <varname>type</varname>,
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<varname>item</varname>, and <varname>value</varname>
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attribute. The syntax and semantics of these attributes
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must be that described in the limits.conf(5) man page.
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'';
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};
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security.pam.services = mkOption {
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default = [];
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type = with types; loaOf (submodule pamOpts);
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description =
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''
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This option defines the PAM services. A service typically
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corresponds to a program that uses PAM,
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e.g. <command>login</command> or <command>passwd</command>.
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Each attribute of this set defines a PAM service, with the attribute name
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defining the name of the service.
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'';
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};
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security.pam.enableSSHAgentAuth = mkOption {
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default = false;
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description =
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''
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Enable sudo logins if the user's SSH agent provides a key
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present in <filename>~/.ssh/authorized_keys</filename>.
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This allows machines to exclusively use SSH keys instead of
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passwords.
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'';
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};
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security.pam.enableOTPW = mkOption {
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default = false;
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description = ''
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Enable the OTPW (one-time password) PAM module.
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'';
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};
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security.pam.enableU2F = mkOption {
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default = false;
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description = ''
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Enable the U2F PAM module.
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'';
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};
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security.pam.enableEcryptfs = mkOption {
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default = false;
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description = ''
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Enable eCryptfs PAM module (mounting ecryptfs home directory on login).
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'';
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};
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users.motd = mkOption {
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default = null;
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example = "Today is Sweetmorn, the 4th day of The Aftermath in the YOLD 3178.";
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type = types.nullOr types.lines;
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description = "Message of the day shown to users when they log in.";
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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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# Include the PAM modules in the system path mostly for the manpages.
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[ pkgs.pam ]
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++ optional config.users.ldap.enable pam_ldap
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++ optionals config.krb5.enable [pam_krb5 pam_ccreds]
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++ optionals config.security.pam.enableOTPW [ pkgs.otpw ]
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++ optionals config.security.pam.oath.enable [ pkgs.oathToolkit ]
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++ optionals config.security.pam.enableU2F [ pkgs.pam_u2f ]
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++ optionals config.security.pam.enableEcryptfs [ pkgs.ecryptfs ];
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security.setuidPrograms =
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optionals config.security.pam.enableEcryptfs [ "mount.ecryptfs_private" "umount.ecryptfs_private" ];
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environment.etc =
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mapAttrsToList (n: v: makePAMService v) config.security.pam.services;
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security.setuidOwners = [ {
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program = "unix_chkpwd";
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source = "${pkgs.pam}/sbin/unix_chkpwd.orig";
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owner = "root";
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setuid = true;
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} ];
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security.pam.services =
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{ other.text =
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''
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auth required pam_warn.so
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auth required pam_deny.so
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account required pam_warn.so
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account required pam_deny.so
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password required pam_warn.so
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password required pam_deny.so
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session required pam_warn.so
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session required pam_deny.so
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'';
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# Most of these should be moved to specific modules.
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cups = {};
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ftp = {};
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i3lock = {};
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i3lock-color = {};
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screen = {};
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vlock = {};
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xlock = {};
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xscreensaver = {};
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runuser = { rootOK = true; unixAuth = false; setEnvironment = false; };
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/* FIXME: should runuser -l start a systemd session? Currently
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it complains "Cannot create session: Already running in a
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session". */
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runuser-l = { rootOK = true; unixAuth = false; };
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};
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};
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}
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