{ config, lib, pkgs, ... }:
let
  inherit (builtins) attrNames hasAttr isAttrs;
  inherit (lib) getLib;
  inherit (config.environment) etc;
  # Utility to generate an AppArmor rule
  # only when the given path exists in config.environment.etc
  etcRule = arg:
    let go = { path ? null, mode ? "r", trail ? "" }:
      lib.optionalString (hasAttr path etc)
        "${mode} ${config.environment.etc.${path}.source}${trail},";
    in if isAttrs arg
    then go arg
    else go { path = arg; };
in
{
# FIXME: most of the etcRule calls below have been
# written systematically by converting from apparmor-profiles's profiles
# without testing nor deep understanding of their uses,
# and thus may need more rules or can have less rules;
# this remains to be determined case by case,
# some may even be completely useless.
config.security.apparmor.includes = {
  # This one is included by <tunables/global>
  # which is usually included before any profile.
  "abstractions/tunables/alias" = ''
    alias /bin -> /run/current-system/sw/bin,
    alias /lib/modules -> /run/current-system/kernel/lib/modules,
    alias /sbin -> /run/current-system/sw/sbin,
    alias /usr -> /run/current-system/sw,
  '';
  "abstractions/audio" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/audio"
    '' + lib.concatMapStringsSep "\n" etcRule [
      "asound.conf"
      "esound/esd.conf"
      "libao.conf"
      { path = "pulse";  trail = "/"; }
      { path = "pulse";  trail = "/**"; }
      { path = "sound";  trail = "/"; }
      { path = "sound";  trail = "/**"; }
      { path = "alsa/conf.d";  trail = "/"; }
      { path = "alsa/conf.d";  trail = "/*"; }
      "openal/alsoft.conf"
      "wildmidi/wildmidi.conf"
    ];
  "abstractions/authentication" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/authentication"
    # Defined in security.pam
    include <abstractions/pam>
    '' + lib.concatMapStringsSep "\n" etcRule [
      "nologin"
      "securetty"
      { path = "security";  trail = "/*"; }
      "shadow"
      "gshadow"
      "pwdb.conf"
      "default/passwd"
      "login.defs"
    ];
  "abstractions/base" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/base"
    r ${pkgs.stdenv.cc.libc}/share/locale/**,
    r ${pkgs.stdenv.cc.libc}/share/locale.alias,
    ${lib.optionalString (pkgs.glibcLocales != null) "r ${pkgs.glibcLocales}/lib/locale/locale-archive,"}
    ${etcRule "localtime"}
    r ${pkgs.tzdata}/share/zoneinfo/**,
    r ${pkgs.stdenv.cc.libc}/share/i18n/**,
  '';
  "abstractions/bash" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/bash"

    # bash inspects filesystems at startup
    # and /etc/mtab is linked to /proc/mounts
    @{PROC}/mounts

    # system-wide bash configuration
    '' + lib.concatMapStringsSep "\n" etcRule [
      "profile.dos"
      "profile"
      "profile.d"
      { path = "profile.d";  trail = "/*"; }
      "bashrc"
      "bash.bashrc"
      "bash.bashrc.local"
      "bash_completion"
      "bash_completion.d"
      { path = "bash_completion.d";  trail = "/*"; }
      # bash relies on system-wide readline configuration
      "inputrc"
      # run out of /etc/bash.bashrc
      "DIR_COLORS"
    ];
  "abstractions/consoles" = ''
     include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/consoles"
  '';
  "abstractions/cups-client" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/cups-client"
    ${etcRule "cups/cups-client.conf"}
  '';
  "abstractions/dbus-session-strict" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/dbus-session-strict"
    ${etcRule "machine-id"}
  '';
  "abstractions/dconf" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/dconf"
    ${etcRule { path = "dconf";  trail = "/**"; }}
  '';
  "abstractions/dri-common" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/dri-common"
    ${etcRule "drirc"}
  '';
  # The config.fonts.fontconfig NixOS module adds many files to /etc/fonts/
  # by symlinking them but without exporting them outside of its NixOS module,
  # those are therefore added there to this "abstractions/fonts".
  "abstractions/fonts" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/fonts"
    ${etcRule { path = "fonts";  trail = "/**"; }}
  '';
  "abstractions/gnome" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/gnome"
    include <abstractions/fonts>
    '' + lib.concatMapStringsSep "\n" etcRule [
      { path = "gnome";  trail = "/gtkrc*"; }
      { path = "gtk";  trail = "/*"; }
      { path = "gtk-2.0";  trail = "/*"; }
      { path = "gtk-3.0";  trail = "/*"; }
      "orbitrc"
      { path = "pango";  trail = "/*"; }
      { path = "/etc/gnome-vfs-2.0";  trail = "/modules/"; }
      { path = "/etc/gnome-vfs-2.0";  trail = "/modules/*"; }
      "papersize"
      { path = "cups";  trail = "/lpoptions"; }
      { path = "gnome";  trail = "/defaults.list"; }
      { path = "xdg";  trail = "/{,*-}mimeapps.list"; }
      "xdg/mimeapps.list"
    ];
  "abstractions/kde" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/kde"
    '' + lib.concatMapStringsSep "\n" etcRule [
      { path = "qt3";  trail = "/kstylerc"; }
      { path = "qt3";  trail = "/qt_plugins_3.3rc"; }
      { path = "qt3";  trail = "/qtrc"; }
      "kderc"
      { path = "kde3";  trail = "/*"; }
      "kde4rc"
      { path = "xdg";  trail = "/kdeglobals"; }
      { path = "xdg";  trail = "/Trolltech.conf"; }
    ];
  "abstractions/kerberosclient" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/kerberosclient"
    '' + lib.concatMapStringsSep "\n" etcRule [
    { path = "krb5.keytab"; mode="rk"; }
    "krb5.conf"
    "krb5.conf.d"
    { path = "krb5.conf.d";  trail = "/*"; }

    # config files found via strings on libs
    "krb.conf"
    "krb.realms"
    "srvtab"
    ];
  "abstractions/ldapclient" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/ldapclient"
    '' + lib.concatMapStringsSep "\n" etcRule [
      "ldap.conf"
      "ldap.secret"
      { path = "openldap";  trail = "/*"; }
      { path = "openldap";  trail = "/cacerts/*"; }
      { path = "sasl2";  trail = "/*"; }
    ];
  "abstractions/likewise" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/likewise"
  '';
  "abstractions/mdns" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/mdns"
    ${etcRule "nss_mdns.conf"}
  '';
  "abstractions/nameservice" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/nameservice"

    # Many programs wish to perform nameservice-like operations, such as
    # looking up users by name or id, groups by name or id, hosts by name
    # or IP, etc. These operations may be performed through files, dns,
    # NIS, NIS+, LDAP, hesiod, wins, etc. Allow them all here.
    mr ${getLib pkgs.nss}/lib/libnss_*.so*,
    mr ${getLib pkgs.nss}/lib64/libnss_*.so*,
    '' + lib.concatMapStringsSep "\n" etcRule [
      "group"
      "host.conf"
      "hosts"
      "nsswitch.conf"
      "gai.conf"
      "passwd"
      "protocols"

      # libtirpc (used for NIS/YP login) needs this
      "netconfig"

      "resolv.conf"

      { path = "samba";  trail = "/lmhosts"; }
      "services"

      "default/nss"

      # libnl-3-200 via libnss-gw-name
      { path = "libnl";  trail = "/classid"; }
      { path = "libnl-3";  trail = "/classid"; }
    ];
  "abstractions/nis" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/nis"
  '';
  "abstractions/nvidia" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/nvidia"
    ${etcRule "vdpau_wrapper.cfg"}
  '';
  "abstractions/opencl-common" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/opencl-common"
    ${etcRule { path = "OpenCL";  trail = "/**"; }}
  '';
  "abstractions/opencl-mesa" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/opencl-mesa"
    ${etcRule "default/drirc"}
  '';
  "abstractions/openssl" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/openssl"
    ${etcRule { path = "ssl";  trail = "/openssl.cnf"; }}
  '';
  "abstractions/p11-kit" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/p11-kit"
    '' + lib.concatMapStringsSep "\n" etcRule [
      { path = "pkcs11";  trail = "/"; }
      { path = "pkcs11";  trail = "/pkcs11.conf"; }
      { path = "pkcs11";  trail = "/modules/"; }
      { path = "pkcs11";  trail = "/modules/*"; }
    ];
  "abstractions/perl" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/perl"
    ${etcRule { path = "perl";  trail = "/**"; }}
  '';
  "abstractions/php" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/php"
    '' + lib.concatMapStringsSep "\n" etcRule [
      { path = "php";  trail = "/**/"; }
      { path = "php5";  trail = "/**/"; }
      { path = "php7";  trail = "/**/"; }
      { path = "php";  trail = "/**.ini"; }
      { path = "php5";  trail = "/**.ini"; }
      { path = "php7";  trail = "/**.ini"; }
    ];
  "abstractions/postfix-common" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/postfix-common"
    '' + lib.concatMapStringsSep "\n" etcRule [
      "mailname"
      { path = "postfix";  trail = "/*.cf"; }
      "postfix/main.cf"
      "postfix/master.cf"
    ];
  "abstractions/python" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/python"
  '';
  "abstractions/qt5" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/qt5"
    '' + lib.concatMapStringsSep "\n" etcRule [
      { path = "xdg";  trail = "/QtProject/qtlogging.ini"; }
      { path = "xdg/QtProject";  trail = "/qtlogging.ini"; }
      "xdg/QtProject/qtlogging.ini"
    ];
  "abstractions/samba" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/samba"
    ${etcRule { path = "samba";  trail = "/*"; }}
  '';
  "abstractions/ssl_certs" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/ssl_certs"

    # For the NixOS module: security.acme
    r /var/lib/acme/*/cert.pem,
    r /var/lib/acme/*/chain.pem,
    r /var/lib/acme/*/fullchain.pem,

    '' + lib.concatMapStringsSep "\n" etcRule [
      "ssl/certs/ca-certificates.crt"
      "ssl/certs/ca-bundle.crt"
      "pki/tls/certs/ca-bundle.crt"

      { path = "ssl/trust";  trail = "/"; }
      { path = "ssl/trust";  trail = "/*"; }
      { path = "ssl/trust/anchors";  trail = "/"; }
      { path = "ssl/trust/anchors";  trail = "/**"; }
      { path = "pki/trust";  trail = "/"; }
      { path = "pki/trust";  trail = "/*"; }
      { path = "pki/trust/anchors";  trail = "/"; }
      { path = "pki/trust/anchors";  trail = "/**"; }
    ];
  "abstractions/ssl_keys" = ''
    # security.acme NixOS module
    r /var/lib/acme/*/full.pem,
    r /var/lib/acme/*/key.pem,
  '';
  "abstractions/vulkan" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/vulkan"
    ${etcRule { path = "vulkan/icd.d";  trail = "/"; }}
    ${etcRule { path = "vulkan/icd.d";  trail = "/*.json"; }}
  '';
  "abstractions/winbind" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/winbind"
    ${etcRule { path = "samba";  trail = "/smb.conf"; }}
    ${etcRule { path = "samba";  trail = "/dhcp.conf"; }}
  '';
  "abstractions/X" = ''
    include "${pkgs.apparmor-profiles}/etc/apparmor.d/abstractions/X"
    ${etcRule { path = "X11/cursors";  trail = "/"; }}
    ${etcRule { path = "X11/cursors";  trail = "/**"; }}
  '';
};
}