Let's encrypt bumped ACME to V2. We need to update our nixos test to
be compatible with this new protocol version.
We decided to drop the Boulder ACME server in favor of the more
integration test friendly Pebble.
- overriding cacert not necessary
- this avoids rebuilding lots of packages needlessly
- nixos/tests/acme: use pebble's ca for client tests
- pebble always generates its own ca which has to be fetched
TODO: write proper commit msg :)
Since the switch to check the nginx config with gixy in
59fac1a6d7, the ACME test doesn't build
anymore, because gixy reports the following false-positive (reindented):
>> Problem: [alias_traversal] Path traversal via misconfigured alias.
Severity: MEDIUM
Description: Using alias in a prefixed location that doesn't ends with
directory separator could lead to path traversal
vulnerability.
Additional info: https://github.com/yandex/gixy/blob/master/docs/en/plugins/aliastraversal.md
Pseudo config:
server {
server_name letsencrypt.org;
location /documents/2017.11.15-LE-SA-v1.2.pdf {
alias /nix/store/y4h5ryvnvxkajkmqxyxsk7qpv7bl3vq7-2017.11.15-LE-SA-v1.2.pdf;
}
}
The reason this is a false-positive is because the destination is not a
directory, so something like "/foo.pdf../other.txt" won't work here,
because the resulting path would be ".../destfile.pdf../other.txt".
Nevertheless it's a good idea to use the exact match operator (=), to
not only shut up gixy but also gain a bit of performance in lookup (not
that it would matter in our test).
Signed-off-by: aszlig <aszlig@nix.build>
The Openstack metadata service exposes the EC2 API. We use the
existing `ec2.nix` module to configure the hostname and ssh keys of an
Openstack Instance.
A test checks the ssh server is well configured.
This is mainly to reduce the size of the image (700MB). Also,
declarative features provided by cloud-init are not really useful
since we would prefer to use our `configuration.nix` file instead.
In 0c7c1660f7 I have set allowSubstitutes
to false, which avoided the substitution of the certificates.
Unfortunately substitution may still happen later when the certificate
is merged with the CA bundle. So the merged CA bundle might be
substituted from a binary cache but the certificate itself is built
locally, which could result in a different certificate in the bundle.
So instead of adding just yet another workaround, I've now hardcoded all
the certificates and keys in a separate file. This also moves
letsencrypt.nix into its own directory so we don't mess up
nixos/tests/common too much.
This was long overdue and should finally make the dependency graph for
the ACME test more deterministic.
Signed-off-by: aszlig <aszlig@nix.build>
Since e95f17e272, Go packages no longer
contain the source tree, however Boulder seems to need that as it
generates a few files during build.
Ideally we would only pick the files that are needed and put it into a
separate output, but I currently don't have time for this so I'm marking
this with XXX to get back to it later.
Signed-off-by: aszlig <aszlig@nix.build>
If one of the certificates of the chain gets substituted from a binary
cache and the rest is generated locally it might turn out that we get
invalid certificates, which in turn cause tests using this module to
fail.
So let's set allowSubstitutes to false for all derivations that are
involved with certificate/key generation.
Signed-off-by: aszlig <aszlig@nix.build>
The enableSSL option has been deprecated in
a912a6a291, so we switch to using onlySSL.
I've also explicitly disabled enableACME, because this is the default
and we don't actually want to have ACME enabled for a host which runs an
actual ACME server.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
These modules implement a way to test ACME based on a test instance of
Letsencrypt's Boulder service. The service implementation is in
letsencrypt.nix and the second module (resolver.nix) is a support-module
for the former, but can also be used for tests not involving ACME.
The second module provides a DNS server which hosts a root zone
containing all the zones and /etc/hosts entries (except loopback) in the
entire test network, so this can be very useful for other modules that
need DNS resolution.
Originally, I wrote these modules for the Headcounter deployment, but
I've refactored them a bit to be generally useful to NixOS users. The
original implementation can be found here:
https://github.com/headcounter/deployment/tree/89e7feafb/modules/testing
Quoting parts from the commit message of the initial implementation of
the Letsencrypt module in headcounter/deployment@95dfb31110:
This module is going to be used for tests where we need to
impersonate an ACME service such as the one from Letsencrypt within
VM tests, which is the reason why this module is a bit ugly (I only
care if it's working not if it's beautiful).
While the module isn't used anywhere, it will serve as a pluggable
module for testing whether ACME works properly to fetch certificates
and also as a replacement for our snakeoil certificate generator.
Also quoting parts of the commit where I have refactored the same module
in headcounter/deployment@85fa481b34:
Now we have a fully pluggable module which automatically discovers
in which network it's used via the nodes attribute.
The test environment of Boulder used "dns-test-srv", which is a fake
DNS server that's resolving almost everything to 127.0.0.1. On our
setup this is not useful, so instead we're now running a local BIND
name server which has a fake root zone and uses the mentioned node
attribute to automatically discover other zones in the network of
machines and generate delegations from the root zone to the
respective zones with the primaryIPAddress of the node.
...
We want to use real letsencrypt.org FQDNs here, so we can't get away
with the snakeoil test certificates from the upstream project but
now roll our own.
This not only has the benefit that we can easily pass the snakeoil
certificate to other nodes, but we can (and do) also use it for an
nginx proxy that's now serving HTTPS for the Boulder web front end.
The Headcounter deployment tests are simulating a production scenario
with real IPs and nameservers so it won't need to rely on
networking.extraHost. However in this implementation we don't
necessarily want to do that, so I've added auto-discovery of
networking.extraHosts in the resolver module.
Another change here is that the letsencrypt module now falls back to
using a local resolver, the Headcounter implementation on the other hand
always required to add an extra test node which serves as a resolver.
I could have squashed both modules into the final ACME test, but that
would make it not very reusable, so that's the main reason why I put
these modules in tests/common.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
