nixos/pam: generate apparmor includes from rules

Removes redundant config from the module. Fixes a bug where some modules
(e.g. ussh) were added to apparmor even though they had no rules enabled.

nixos/modules/security/pam.nix

@@ -1508,9 +1508,7 @@ in
         fscrypt = {};
       };
 
-    security.apparmor.includes."abstractions/pam" = let
-      isEnabled = test: fold or false (map test (attrValues config.security.pam.services));
-      in
+    security.apparmor.includes."abstractions/pam" =
       lib.concatMapStrings
         (name: "r ${config.environment.etc."pam.d/${name}".source},\n")
         (attrNames config.security.pam.services) +
@@ -1519,88 +1517,18 @@ in
       mr ${getLib pkgs.pam}/lib/security/pam_*.so,
       r ${getLib pkgs.pam}/lib/security/,
       '' +
-      optionalString use_ldap ''
-         mr ${pam_ldap}/lib/security/pam_ldap.so,
-      '' +
-      optionalString config.services.kanidm.enablePam ''
-        mr ${pkgs.kanidm}/lib/pam_kanidm.so,
-      '' +
-      optionalString config.services.sssd.enable ''
-        mr ${pkgs.sssd}/lib/security/pam_sss.so,
-      '' +
-      optionalString config.security.pam.krb5.enable ''
-        mr ${pam_krb5}/lib/security/pam_krb5.so,
-        mr ${pam_ccreds}/lib/security/pam_ccreds.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.googleOsLoginAccountVerification)) ''
-        mr ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_login.so,
-        mr ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_admin.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.googleOsLoginAuthentication)) ''
-        mr ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_login.so,
-      '' +
-      optionalString (config.security.pam.enableSSHAgentAuth
-                     && isEnabled (cfg: cfg.sshAgentAuth)) ''
-        mr ${pkgs.pam_ssh_agent_auth}/libexec/pam_ssh_agent_auth.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.fprintAuth)) ''
-        mr ${pkgs.fprintd}/lib/security/pam_fprintd.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.u2fAuth)) ''
-        mr ${pkgs.pam_u2f}/lib/security/pam_u2f.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.usbAuth)) ''
-        mr ${pkgs.pam_usb}/lib/security/pam_usb.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.usshAuth)) ''
-        mr ${pkgs.pam_ussh}/lib/security/pam_ussh.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.oathAuth)) ''
-        "mr ${pkgs.oath-toolkit}/lib/security/pam_oath.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.mysqlAuth)) ''
-        mr ${pkgs.pam_mysql}/lib/security/pam_mysql.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.yubicoAuth)) ''
-        mr ${pkgs.yubico-pam}/lib/security/pam_yubico.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.duoSecurity.enable)) ''
-        mr ${pkgs.duo-unix}/lib/security/pam_duo.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.otpwAuth)) ''
-        mr ${pkgs.otpw}/lib/security/pam_otpw.so,
-      '' +
-      optionalString config.security.pam.enableEcryptfs ''
-        mr ${pkgs.ecryptfs}/lib/security/pam_ecryptfs.so,
-      '' +
-      optionalString config.security.pam.enableFscrypt ''
-        mr ${pkgs.fscrypt-experimental}/lib/security/pam_fscrypt.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.pamMount)) ''
-        mr ${pkgs.pam_mount}/lib/security/pam_mount.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.enableGnomeKeyring)) ''
-        mr ${pkgs.gnome.gnome-keyring}/lib/security/pam_gnome_keyring.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.startSession)) ''
-        mr ${config.systemd.package}/lib/security/pam_systemd.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.enableAppArmor)
-                     && config.security.apparmor.enable) ''
-        mr ${pkgs.apparmor-pam}/lib/security/pam_apparmor.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.enableKwallet)) ''
-        mr ${pkgs.plasma5Packages.kwallet-pam}/lib/security/pam_kwallet5.so,
-      '' +
-      optionalString config.virtualisation.lxc.lxcfs.enable ''
-        mr ${pkgs.lxc}/lib/security/pam_cgfs.so,
-      '' +
-      optionalString (isEnabled (cfg: cfg.zfs)) ''
-        mr ${config.boot.zfs.package}/lib/security/pam_zfs_key.so,
-      '' +
-      optionalString config.services.homed.enable ''
-        mr ${config.systemd.package}/lib/security/pam_systemd_home.so
-      '';
+      (with lib; pipe config.security.pam.services [
+        attrValues
+        (catAttrs "rules")
+        (concatMap attrValues)
+        (concatMap attrValues)
+        (filter (rule: rule.enable))
+        (catAttrs "modulePath")
+        (filter (hasPrefix "/"))
+        unique
+        (map (module: "mr ${module},"))
+        concatLines
+      ]);
   };
 
 }