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Ryan Yin
a7f7cb68f0
The broad 'file /** rwlkUx' rule conflicts with rix exec rules pulled in via nested abstractions (xdg-open): AppArmor 5.0 rejects merged rules with differing exec modifiers, failing apparmor.service on first load.
62 lines
2.2 KiB
Nix
62 lines
2.2 KiB
Nix
{
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config,
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pkgs,
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...
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}:
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{
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# AppArmor: activate the LSM + load policies. Roll out in complain mode first
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# (log violations, never block) so nothing can break; promote profiles to
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# "enforce" individually once stable.
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services.dbus.apparmor = "enabled";
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security.apparmor = {
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enable = true;
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# Do not SIGTERM running unconfined-but-confinable processes yet.
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# Safe to flip to true later now that no global default-deny profile is active.
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killUnconfinedConfinables = false;
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# Packages contributing to AppArmor's include path (abstractions).
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# NOTE: these abstractions are FHS-oriented and reference FHS paths. nixpkgs does NOT
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# provide a broad FHS->store alias layer (only /run/current-system, /usr/bin/env and
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# /bin/sh are created), so some referenced paths do not resolve on NixOS and the
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# resulting profiles are incomplete. They are safe only because they run in complain
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# mode (log-only, no blocking); see hardening/README.md.
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packages = [ pkgs.apparmor-profiles ];
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policies = {
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# Global default-deny scaffold. DANGEROUS to enable: `/**` matches every binary and
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# the empty block allows nothing. Keep disabled until per-app profiles exist.
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"default_deny" = {
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state = "disable";
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profile = "profile default_deny /** { }";
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};
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# Confine sudo; complain mode so a missing rule logs instead of blocking.
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"sudo" = {
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state = "complain";
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profile = ''
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abi <abi/4.0>,
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include <tunables/global>
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# NOTE: exec must use the `ix` (inherit) modifier here: abstractions/base
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# pulls in nested rules like `rix` on specific binaries (via xdg-open etc.),
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# and AppArmor 5.0's parser rejects merged rules with conflicting exec
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# modifiers ("profile has merged rule with conflicting x modifiers") when a
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# broad rule uses Ux over those paths.
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profile ${pkgs.sudo}/bin/sudo {
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include <abstractions/base>
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file /** rwlkix,
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}
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'';
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};
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# nix runs unconfined (no restriction); inert, kept disabled.
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"nix" = {
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state = "disable";
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profile = "profile ${config.nix.package}/bin/nix { unconfined, }";
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};
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};
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};
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}
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