lix/tests/nixos/fetchurl.nix
Eelco Dolstra c1631b0a39 [security] builtin:fetchurl: Enable TLS verification
This is better for privacy and to avoid leaking netrc credentials in a
MITM attack, but also the assumption that we check the hash no longer
holds in some cases (in particular for impure derivations).

Partially reverts 5db358d4d7.

(cherry picked from commit c04bc17a5a0fdcb725a11ef6541f94730112e7b6)
(cherry picked from commit f2f47fa725fc87bfb536de171a2ea81f2789c9fb)
(cherry picked from commit 7b39cd631e0d3c3d238015c6f450c59bbc9cbc5b)

Upstream-PR: https://github.com/NixOS/nix/pull/11585

Change-Id: Ia973420f6098113da05a594d48394ce1fe41fbb9
2024-09-25 18:40:58 -07:00

79 lines
2.3 KiB
Nix

# Test whether builtin:fetchurl properly performs TLS certificate
# checks on HTTPS servers.
{ lib, config, pkgs, ... }:
let
makeTlsCert = name: pkgs.runCommand name {
nativeBuildInputs = with pkgs; [ openssl ];
} ''
mkdir -p $out
openssl req -x509 \
-subj '/CN=${name}/' -days 49710 \
-addext 'subjectAltName = DNS:${name}' \
-keyout "$out/key.pem" -newkey ed25519 \
-out "$out/cert.pem" -noenc
'';
goodCert = makeTlsCert "good";
badCert = makeTlsCert "bad";
in
{
name = "fetchurl";
nodes = {
machine = { lib, pkgs, ... }: {
services.nginx = {
enable = true;
virtualHosts."good" = {
addSSL = true;
sslCertificate = "${goodCert}/cert.pem";
sslCertificateKey = "${goodCert}/key.pem";
root = pkgs.runCommand "nginx-root" {} ''
mkdir "$out"
echo 'hello world' > "$out/index.html"
'';
};
virtualHosts."bad" = {
addSSL = true;
sslCertificate = "${badCert}/cert.pem";
sslCertificateKey = "${badCert}/key.pem";
root = pkgs.runCommand "nginx-root" {} ''
mkdir "$out"
echo 'foobar' > "$out/index.html"
'';
};
};
security.pki.certificateFiles = [ "${goodCert}/cert.pem" ];
networking.hosts."127.0.0.1" = [ "good" "bad" ];
virtualisation.writableStore = true;
nix.settings.experimental-features = "nix-command";
};
};
testScript = { nodes, ... }: ''
machine.wait_for_unit("nginx")
machine.wait_for_open_port(443)
out = machine.succeed("curl https://good/index.html")
assert out == "hello world\n"
# Fetching from a server with a trusted cert should work.
machine.succeed("nix build --no-substitute --expr 'import <nix/fetchurl.nix> { url = \"https://good/index.html\"; hash = \"sha256-qUiQTy8PR5uPgZdpSzAYSw0u0cHNKh7A+4XSmaGSpEc=\"; }'")
# Fetching from a server with an untrusted cert should fail.
err = machine.fail("nix build --no-substitute --expr 'import <nix/fetchurl.nix> { url = \"https://bad/index.html\"; hash = \"sha256-rsBwZF/lPuOzdjBZN2E08FjMM3JHyXit0Xi2zN+wAZ8=\"; }' 2>&1")
print(err)
assert "SSL certificate problem: self-signed certificate" in err or "SSL peer certificate or SSH remote key was not OK" in err
'';
}