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|
{ lib, pkgs, ... }:
let
# Hashes for the test files we serve. We have multiple of them to force nix
# to download the files instead of using the already-downloaded variant
hashes = {
a = "sha256-ypeBEsobvcr6wjGzmiPcTaeG7/gUfE5yuYB3ha/uSLs=";
b = "sha256-PiPoFgA5WUoziU9lZOGxNIu9egCI1CxKy3PurtWcAJ0=";
c = "sha256-Ln0sA6lQeuJl7PW1NWiFpTOTogKdJBOUmXJloaJa78Y=";
};
# Builds a .nix file that can download a file from the test server
mkFetcher =
{
name,
url,
hash,
}:
pkgs.writeText "${name}.nix" ''
derivation {
name = "${name}-fetch";
builder = "builtin:fetchurl";
system = "builtin";
preferLocalBuild = true;
url = "${url}";
outputHash = "${hash}";
outputHashMode = "flat";
}
'';
# Fetches a file from the public IP, port 80
publicFetcher = mkFetcher {
name = "public";
url = "http://1.0.0.1/a";
hash = hashes.a;
};
# Fetches a file from the private IP, port 80
privateFetcher = mkFetcher {
name = "private";
url = "http://192.168.0.1/b";
hash = hashes.b;
};
# Fetches a file from the public IP, port 81
publicFetcherOtherPort = mkFetcher {
name = "public";
url = "http://192.168.0.1:81/c";
hash = hashes.c;
};
# Fetches a file from localhost
localhostFetcher = mkFetcher {
name = "localhost";
url = "http://127.0.0.1/a";
hash = hashes.a;
};
# Generates a file but tries to resolve via DNS first
resolver = pkgs.writeText "pinger.nix" ''
derivation {
name = "resolver";
system = builtins.currentSystem;
preferLocalBuild = true;
builder = "/bin/sh";
args = [ "-c" "${pkgs.pkgsStatic.busybox}/bin/nslookup . && echo hello > $out" ];
outputHash = "sha256-WJG1tSLV3whtD/CxEPvZ0hu0/HFjrzTQgoai6Eb2vgM=";
outputHashMode = "flat";
}
'';
# Base system for all fetchers
baseNixSystem = ipSuffix: {
networking = {
useDHCP = false;
interfaces.eth1 = {
ipv4.addresses = [
{
address = "192.168.0.${toString ipSuffix}";
prefixLength = 24;
}
{
address = "1.0.0.${toString ipSuffix}";
prefixLength = 24;
}
];
};
nftables = {
enable = true;
flushRuleset = false;
};
};
nix.settings = {
# Gets rid of substitution warnings
substituters = lib.mkForce [ ];
# Gives us access inside the nix sandbox
extra-sandbox-paths = [ "${pkgs.pkgsStatic.busybox}" ];
};
nix.enable = true; # disabled by default. See all-tests.nix / tag(no-nix-by-default)
# Easy way to get files to the system
environment.etc = {
"fetch-public.nix".source = publicFetcher;
"fetch-private.nix".source = privateFetcher;
"fetch-public-other-port.nix".source = publicFetcherOtherPort;
"fetch-localhost.nix".source = localhostFetcher;
"resolver.nix".source = resolver;
};
# For localhost tests
services.nginx = {
enable = true;
virtualHosts.default.locations."/a".return = "200 \"a\"";
};
};
in
{
name = "nix-daemon-firewall";
meta.maintainers = with lib.maintainers; [ das_j ];
nodes = {
httpServer = {
services.nginx = {
enable = true;
virtualHosts.default = {
listen = [
{
addr = "0.0.0.0";
port = 80;
}
{
addr = "0.0.0.0";
port = 81;
}
];
locations = {
"/a".return = "200 \"a\"";
"/b".return = "200 \"b\"";
"/c".return = "200 \"c\"";
};
};
};
networking = {
useDHCP = false;
interfaces.eth1 = {
ipv4.addresses = [
{
address = "192.168.0.1";
prefixLength = 24;
}
{
address = "1.0.0.1";
prefixLength = 24;
}
];
};
firewall.allowedTCPPorts = [
80
81
];
};
};
unfirewalled = {
imports = [ (baseNixSystem 2) ];
};
everythingAllowed = {
imports = [ (baseNixSystem 3) ];
nix.firewall = {
enable = true;
allowLoopback = true;
allowNonTCPUDP = true;
};
};
noLocalNets = {
imports = [ (baseNixSystem 4) ];
nix.firewall = {
enable = true;
allowPrivateNetworks = false;
};
};
onlyPort80 = {
imports = [ (baseNixSystem 5) ];
nix.firewall = {
enable = true;
allowedTCPPorts = [ 80 ];
};
};
resolved = {
imports = [ (baseNixSystem 6) ];
nix.firewall = {
enable = true;
};
services.resolved.enable = true;
};
};
testScript = ''
# Startup
start_all()
httpServer.wait_for_open_port(80)
# No firewall
unfirewalled.wait_for_unit("multi-user.target")
unfirewalled.fail("nft list ruleset | grep nix_daemon_traffic")
# Everything allowed
everythingAllowed.wait_for_unit("multi-user.target")
everythingAllowed.succeed("nft list ruleset | grep nix_daemon_traffic")
everythingAllowed.succeed("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-public.nix")
everythingAllowed.succeed("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-private.nix")
everythingAllowed.succeed("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-public-other-port.nix")
everythingAllowed.succeed("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-localhost.nix")
# No local networks and no localhost
noLocalNets.wait_for_unit("multi-user.target")
noLocalNets.succeed("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-public.nix")
noLocalNets.fail("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-private.nix")
noLocalNets.fail("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-localhost.nix")
# Ports
onlyPort80.wait_for_unit("multi-user.target")
onlyPort80.succeed("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-public.nix")
onlyPort80.fail("NIX_REMOTE=daemon nix-build --timeout 5 /etc/fetch-public-other-port.nix")
# systemd-resolved
resolved.wait_for_unit("multi-user.target")
resolved.succeed("NIX_REMOTE=daemon nix-build --timeout 5 /etc/resolver.nix")
'';
}
|
