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security: don't restrict process info by default for module users

This commit is contained in:
Erik Arvstedt 2020-08-20 13:11:10 +02:00
parent a36789b468
commit 44de5064cd
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GPG Key ID: 33312B944DD97846
2 changed files with 36 additions and 31 deletions
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3
modules/presets/secure-node.nix
View File

@ -42,8 +42,7 @@ in {
networking.firewall.enable = true;
# hideProcessInformation even if hardened kernel profile is disabled
security.hideProcessInformation = true;
nix-bitcoin.security.hideProcessInformation = true;
# Tor
services.tor = {

64
modules/security.nix
View File

@ -1,33 +1,39 @@
{ config, lib, pkgs, ... }:
{ config, lib, pkgs, options, ... }:
{
# Only show the current user's processes in /proc.
# Users with group 'proc' can still access all processes.
security.hideProcessInformation = true;
options = {
nix-bitcoin.security.hideProcessInformation = options.security.hideProcessInformation;
};
# This mitigates a systemd security issue leaking (sub)process
# command lines.
# Only allow users with group 'proc' to retrieve systemd unit information like
# cgroup paths (i.e. (sub)process command lines) via D-Bus.
# This D-Bus call is used by `systemctl status`.
services.dbus.packages = lib.mkAfter [ # Apply at the end to override the default policy
(pkgs.writeTextDir "etc/dbus-1/system.d/dbus.conf" ''
<busconfig>
<policy context="default">
<deny
send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitProcesses"
/>
</policy>
<policy group="proc">
<allow
send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitProcesses"
/>
</policy>
</busconfig>
'')
];
config = lib.mkIf config.nix-bitcoin.security.hideProcessInformation {
# Only show the current user's processes in /proc.
# Users with group 'proc' can still access all processes.
security.hideProcessInformation = true;
# This mitigates a systemd security issue leaking (sub)process
# command lines.
# Only allow users with group 'proc' to retrieve systemd unit information like
# cgroup paths (i.e. (sub)process command lines) via D-Bus.
# This D-Bus call is used by `systemctl status`.
services.dbus.packages = lib.mkAfter [ # Apply at the end to override the default policy
(pkgs.writeTextDir "etc/dbus-1/system.d/dbus.conf" ''
<busconfig>
<policy context="default">
<deny
send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitProcesses"
/>
</policy>
<policy group="proc">
<allow
send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitProcesses"
/>
</policy>
</busconfig>
'')
];
};
}