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nixos: Fix ordering of firewall.service

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Follow-up to the following commits:

  abdc5961c3cdf9f5893ea1e91ba08ff5089f53a4: Fix starting the firewall
  e090701e2d09aec3e8866ab9a8e53c37973ffeb4: Order before sysinit

Solely use sysinit.target here instead of multi-user.target because we
want to make sure that the iptables rules are applied *before* any
socket units are started.

The reason I've dropped the wantedBy on multi-user.target is that
sysinit.target is already a part of the dependency chain of
multi-user.target.

To make sure that this holds true, I've added a small test case to
ensure that during switch of the configuration the firewall.service is
considered as well.

Tested using the firewall NixOS test.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Cc: @edolstra
This commit is contained in:
aszlig 2016-09-07 14:18:32 +02:00
parent 10b335992e
commit fb46df8a9a
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GPG Key ID: 1DE8E48E57DB5436
2 changed files with 36 additions and 20 deletions
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3
nixos/modules/services/networking/firewall.nix
View File

@ -490,7 +490,7 @@ in
systemd.services.firewall = { systemd.services.firewall = {
description = "Firewall"; description = "Firewall";
wantedBy = [ "multi-user.target" "sysinit.target" ]; wantedBy = [ "sysinit.target" ];
wants = [ "network-pre.target" ]; wants = [ "network-pre.target" ];
before = [ "network-pre.target" ]; before = [ "network-pre.target" ];
after = [ "systemd-modules-load.service" ]; after = [ "systemd-modules-load.service" ];
@ -501,6 +501,7 @@ in
# containers don't have CAP_SYS_MODULE. So the host system had # containers don't have CAP_SYS_MODULE. So the host system had
# better have all necessary modules already loaded. # better have all necessary modules already loaded.
unitConfig.ConditionCapability = "CAP_NET_ADMIN"; unitConfig.ConditionCapability = "CAP_NET_ADMIN";
unitConfig.DefaultDependencies = false;
reloadIfChanged = true; reloadIfChanged = true;

53
nixos/tests/firewall.nix
View File

@ -15,6 +15,16 @@ import ./make-test.nix ( { pkgs, ... } : {
services.httpd.adminAddr = "foo@example.org"; services.httpd.adminAddr = "foo@example.org";
}; };
# Dummy configuration to check whether firewall.service will be honored
# during system activation. This only needs to be different to the
# original walled configuration so that there is a change in the service
# file.
walled2 =
{ config, pkgs, nodes, ... }:
{ networking.firewall.enable = true;
networking.firewall.rejectPackets = true;
};
attacker = attacker =
{ config, pkgs, ... }: { config, pkgs, ... }:
{ services.httpd.enable = true; { services.httpd.enable = true;
@ -23,28 +33,33 @@ import ./make-test.nix ( { pkgs, ... } : {
}; };
}; };
testScript = testScript = { nodes, ... }: let
{ nodes, ... }: newSystem = nodes.walled2.config.system.build.toplevel;
'' in ''
startAll; $walled->start;
$attacker->start;
$walled->waitForUnit("firewall"); $walled->waitForUnit("firewall");
$walled->waitForUnit("httpd"); $walled->waitForUnit("httpd");
$attacker->waitForUnit("network.target"); $attacker->waitForUnit("network.target");
# Local connections should still work. # Local connections should still work.
$walled->succeed("curl -v http://localhost/ >&2"); $walled->succeed("curl -v http://localhost/ >&2");
# Connections to the firewalled machine should fail, but ping should succeed. # Connections to the firewalled machine should fail, but ping should succeed.
$attacker->fail("curl --fail --connect-timeout 2 http://walled/ >&2"); $attacker->fail("curl --fail --connect-timeout 2 http://walled/ >&2");
$attacker->succeed("ping -c 1 walled >&2"); $attacker->succeed("ping -c 1 walled >&2");
# Outgoing connections/pings should still work. # Outgoing connections/pings should still work.
$walled->succeed("curl -v http://attacker/ >&2"); $walled->succeed("curl -v http://attacker/ >&2");
$walled->succeed("ping -c 1 attacker >&2"); $walled->succeed("ping -c 1 attacker >&2");
# If we stop the firewall, then connections should succeed. # If we stop the firewall, then connections should succeed.
$walled->stopJob("firewall"); $walled->stopJob("firewall");
$attacker->succeed("curl -v http://walled/ >&2"); $attacker->succeed("curl -v http://walled/ >&2");
'';
# Check whether activation of a new configuration reloads the firewall.
$walled->succeed("${newSystem}/bin/switch-to-configuration test 2>&1" .
" | grep -qF firewall.service");
'';
}) })