279 lines
11 KiB
Nix
279 lines
11 KiB
Nix
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/*
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Test that our unbound module indeed works as most users would expect.
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There are a few settings that we must consider when modifying the test. The
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ususal use-cases for unbound are
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* running a recursive DNS resolver on the local machine
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* running a recursive DNS resolver on the local machine, forwarding to a local DNS server via UDP/53 & TCP/53
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* running a recursive DNS resolver on the local machine, forwarding to a local DNS server via TCP/853 (DoT)
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* running a recursive DNS resolver on a machine in the network awaiting input from clients over TCP/53 & UDP/53
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* running a recursive DNS resolver on a machine in the network awaiting input from clients over TCP/853 (DoT)
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In the below test setup we are trying to implement all of those use cases.
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Another aspect that we cover is access to the local control UNIX socket. It
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can optionally be enabled and users can optionally be in a group to gain
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access. Users that are not in the group (except for root) should not have
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access to that socket. Also, when there is no socket configured, users
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shouldn't be able to access the control socket at all. Not even root.
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*/
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import ./make-test-python.nix ({ pkgs, lib, ... }:
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let
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# common client configuration that we can just use for the multitude of
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# clients we are constructing
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common = { lib, pkgs, ... }: {
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config = {
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environment.systemPackages = [ pkgs.knot-dns ];
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# disable the root anchor update as we do not have internet access during
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# the test execution
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services.unbound.enableRootTrustAnchor = false;
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};
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};
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cert = pkgs.runCommandNoCC "selfSignedCerts" { buildInputs = [ pkgs.openssl ]; } ''
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openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -nodes -subj '/CN=dns.example.local'
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mkdir -p $out
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cp key.pem cert.pem $out
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'';
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in
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{
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name = "unbound";
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meta = with pkgs.stdenv.lib.maintainers; {
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maintainers = [ andir ];
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};
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nodes = {
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# The server that actually serves our zones, this tests unbounds authoriative mode
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authoritative = { lib, pkgs, config, ... }: {
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imports = [ common ];
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networking.interfaces.eth1.ipv4.addresses = lib.mkForce [
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{ address = "192.168.0.1"; prefixLength = 24; }
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];
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networking.interfaces.eth1.ipv6.addresses = lib.mkForce [
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{ address = "fd21::1"; prefixLength = 64; }
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];
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networking.firewall.allowedTCPPorts = [ 53 ];
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networking.firewall.allowedUDPPorts = [ 53 ];
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services.unbound = {
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enable = true;
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interfaces = [ "192.168.0.1" "fd21::1" "::1" "127.0.0.1" ];
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allowedAccess = [ "192.168.0.0/24" "fd21::/64" "::1" "127.0.0.0/8" ];
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extraConfig = ''
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server:
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local-data: "example.local. IN A 1.2.3.4"
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local-data: "example.local. IN AAAA abcd::eeff"
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'';
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};
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};
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# The resolver that knows that fowards (only) to the authoritative server
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# and listens on UDP/53, TCP/53 & TCP/853.
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resolver = { lib, nodes, ... }: {
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imports = [ common ];
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networking.interfaces.eth1.ipv4.addresses = lib.mkForce [
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{ address = "192.168.0.2"; prefixLength = 24; }
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];
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networking.interfaces.eth1.ipv6.addresses = lib.mkForce [
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{ address = "fd21::2"; prefixLength = 64; }
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];
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networking.firewall.allowedTCPPorts = [
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53 # regular DNS
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853 # DNS over TLS
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];
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networking.firewall.allowedUDPPorts = [ 53 ];
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services.unbound = {
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enable = true;
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allowedAccess = [ "192.168.0.0/24" "fd21::/64" "::1" "127.0.0.0/8" ];
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interfaces = [ "::1" "127.0.0.1" "192.168.0.2" "fd21::2" "192.168.0.2@853" "fd21::2@853" "::1@853" "127.0.0.1@853" ];
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forwardAddresses = [
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(lib.head nodes.authoritative.config.networking.interfaces.eth1.ipv6.addresses).address
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(lib.head nodes.authoritative.config.networking.interfaces.eth1.ipv4.addresses).address
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];
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extraConfig = ''
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server:
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tls-service-pem: ${cert}/cert.pem
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tls-service-key: ${cert}/key.pem
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'';
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};
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};
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# machine that runs a local unbound that will be reconfigured during test execution
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local_resolver = { lib, nodes, config, ... }: {
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imports = [ common ];
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networking.interfaces.eth1.ipv4.addresses = lib.mkForce [
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{ address = "192.168.0.3"; prefixLength = 24; }
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];
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networking.interfaces.eth1.ipv6.addresses = lib.mkForce [
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{ address = "fd21::3"; prefixLength = 64; }
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];
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networking.firewall.allowedTCPPorts = [
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53 # regular DNS
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];
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networking.firewall.allowedUDPPorts = [ 53 ];
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services.unbound = {
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enable = true;
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allowedAccess = [ "::1" "127.0.0.0/8" ];
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interfaces = [ "::1" "127.0.0.1" ];
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localControlSocketPath = "/run/unbound/unbound.ctl";
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extraConfig = ''
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include: "/etc/unbound/extra*.conf"
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'';
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};
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users.users = {
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# user that is permitted to access the unix socket
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someuser.extraGroups = [
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config.users.users.unbound.group
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];
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# user that is not permitted to access the unix socket
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unauthorizeduser = {};
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};
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environment.etc = {
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"unbound-extra1.conf".text = ''
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forward-zone:
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name: "example.local."
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forward-addr: ${(lib.head nodes.resolver.config.networking.interfaces.eth1.ipv6.addresses).address}
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forward-addr: ${(lib.head nodes.resolver.config.networking.interfaces.eth1.ipv4.addresses).address}
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'';
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"unbound-extra2.conf".text = ''
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auth-zone:
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name: something.local.
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zonefile: ${pkgs.writeText "zone" ''
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something.local. IN A 3.4.5.6
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''}
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'';
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};
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};
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# plain node that only has network access and doesn't run any part of the
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# resolver software locally
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client = { lib, nodes, ... }: {
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imports = [ common ];
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networking.nameservers = [
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(lib.head nodes.resolver.config.networking.interfaces.eth1.ipv6.addresses).address
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(lib.head nodes.resolver.config.networking.interfaces.eth1.ipv4.addresses).address
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];
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networking.interfaces.eth1.ipv4.addresses = [
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{ address = "192.168.0.10"; prefixLength = 24; }
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];
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networking.interfaces.eth1.ipv6.addresses = [
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{ address = "fd21::10"; prefixLength = 64; }
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];
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};
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};
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testScript = { nodes, ... }: ''
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import typing
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import json
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zone = "example.local."
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records = [("AAAA", "abcd::eeff"), ("A", "1.2.3.4")]
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def query(
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machine,
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host: str,
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query_type: str,
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query: str,
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expected: typing.Optional[str] = None,
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args: typing.Optional[typing.List[str]] = None,
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):
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"""
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Execute a single query and compare the result with expectation
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"""
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text_args = ""
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if args:
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text_args = " ".join(args)
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out = machine.succeed(
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f"kdig {text_args} {query} {query_type} @{host} +short"
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).strip()
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machine.log(f"{host} replied with {out}")
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if expected:
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assert expected == out, f"Expected `{expected}` but got `{out}`"
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def test(machine, remotes, /, doh=False, zone=zone, records=records, args=[]):
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"""
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Run queries for the given remotes on the given machine.
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"""
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for query_type, expected in records:
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for remote in remotes:
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query(machine, remote, query_type, zone, expected, args)
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query(machine, remote, query_type, zone, expected, ["+tcp"] + args)
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if doh:
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query(
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machine,
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remote,
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query_type,
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zone,
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expected,
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["+tcp", "+tls"] + args,
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)
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client.start()
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authoritative.wait_for_unit("unbound.service")
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# verify that we can resolve locally
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with subtest("test the authoritative servers local responses"):
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test(authoritative, ["::1", "127.0.0.1"])
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resolver.wait_for_unit("unbound.service")
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with subtest("root is unable to use unbounc-control when the socket is not configured"):
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resolver.succeed("which unbound-control") # the binary must exist
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resolver.fail("unbound-control list_forwards") # the invocation must fail
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# verify that the resolver is able to resolve on all the local protocols
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with subtest("test that the resolver resolves on all protocols and transports"):
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test(resolver, ["::1", "127.0.0.1"], doh=True)
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resolver.wait_for_unit("multi-user.target")
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with subtest("client should be able to query the resolver"):
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test(client, ["${(lib.head nodes.resolver.config.networking.interfaces.eth1.ipv6.addresses).address}", "${(lib.head nodes.resolver.config.networking.interfaces.eth1.ipv4.addresses).address}"], doh=True)
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# discard the client we do not need anymore
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client.shutdown()
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local_resolver.wait_for_unit("multi-user.target")
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# link a new config file to /etc/unbound/extra.conf
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local_resolver.succeed("ln -s /etc/unbound-extra1.conf /etc/unbound/extra1.conf")
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# reload the server & ensure the forwarding works
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with subtest("test that the local resolver resolves on all protocols and transports"):
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local_resolver.succeed("systemctl reload unbound")
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print(local_resolver.succeed("journalctl -u unbound -n 1000"))
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test(local_resolver, ["::1", "127.0.0.1"], args=["+timeout=60"])
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with subtest("test that we can use the unbound control socket"):
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out = local_resolver.succeed(
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"sudo -u someuser -- unbound-control list_forwards"
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).strip()
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# Thank you black! Can't really break this line into a readable version.
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expected = "example.local. IN forward ${(lib.head nodes.resolver.config.networking.interfaces.eth1.ipv6.addresses).address} ${(lib.head nodes.resolver.config.networking.interfaces.eth1.ipv4.addresses).address}"
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assert out == expected, f"Expected `{expected}` but got `{out}` instead."
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local_resolver.fail("sudo -u unauthorizeduser -- unbound-control list_forwards")
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# link a new config file to /etc/unbound/extra.conf
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local_resolver.succeed("ln -sf /etc/unbound-extra2.conf /etc/unbound/extra2.conf")
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# reload the server & ensure the new local zone works
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with subtest("test that we can query the new local zone"):
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local_resolver.succeed("unbound-control reload")
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r = [("A", "3.4.5.6")]
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test(local_resolver, ["::1", "127.0.0.1"], zone="something.local.", records=r)
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'';
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})
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