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app: set up acl on X11 socket

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The socket is typically owned by the priv-user, and inaccessible by the target user, so just allowing access to the directory is not enough. This change fixes this oversight and add checks that will also be useful for merging security/hakurei#1.

Signed-off-by: Ophestra <cat@gensokyo.uk>
This commit is contained in:
Ophestra
2025-08-18 02:24:56 +09:00
parent 0ac6e99818
commit 83a1c75f1a
8 changed files with 111 additions and 3 deletions
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11
test/sandbox/case/tty.nix
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@@ -34,6 +34,7 @@ in
mapRealUid = false;
useCommonPaths = true;
userns = false;
x11 = true;
# 0, PresetExt | PresetDenyNS | PresetDenyDevel
expectedFilter = {
@@ -44,6 +45,7 @@ in
want = {
env = [
"DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/65534/bus"
"DISPLAY=unix:/tmp/.X11-unix/X0"
"HOME=/var/lib/hakurei/u0/a2"
"PULSE_SERVER=unix:/run/user/65534/pulse/native"
"SHELL=/run/current-system/sw/bin/bash"
@@ -188,7 +190,9 @@ in
} null;
devices = fs "800001ed" null null;
} null;
tmp = fs "800001f8" { } null;
tmp = fs "800001f8" {
".X11-unix" = fs "801001ff" { X0 = fs "10001fd" null null; } null;
} null;
usr = fs "800001c0" { bin = fs "800001ed" { env = fs "80001ff" null null; } null; } null;
var = fs "800001c0" {
lib = fs "800001c0" {
@@ -263,10 +267,15 @@ in
(ent ignore "/etc/passwd" "ro,nosuid,nodev,relatime" "tmpfs" "rootfs" "rw,uid=1000002,gid=1000002")
(ent ignore "/etc/group" "ro,nosuid,nodev,relatime" "tmpfs" "rootfs" "rw,uid=1000002,gid=1000002")
(ent ignore "/run/user/65534/wayland-0" "ro,nosuid,nodev,relatime" "ext4" "/dev/disk/by-label/nixos" "rw")
(ent "/tmp/.X11-unix" "/tmp/.X11-unix" "ro,nosuid,nodev,relatime" "ext4" "/dev/disk/by-label/nixos" "rw")
(ent ignore "/run/user/65534/pulse/native" "ro,nosuid,nodev,relatime" "tmpfs" "tmpfs" ignore)
(ent ignore "/run/user/65534/bus" "ro,nosuid,nodev,relatime" "ext4" "/dev/disk/by-label/nixos" "rw")
];
seccomp = true;
try_socket = "/tmp/.X11-unix/X0";
socket_abstract = true;
socket_pathname = true;
};
}