Unbundle certificate?

[Carlos Alberto Carnero Delgado]

Currently testing this awesome project, and got to the point where I got the certificate for the certera instance. While testing the process of getting that certificate from a remote node (using curl) for further deployment, the file I got seems to include the full certificate chain.

Currently, the endpoint I'm hitting, as per the documentation, is /api/certificate/<certificate_name>. Is there another endpoint for the unbundled certificate? If not, how about another parameter, like bundled=true|false? By default true to avoid breakage.

In the same vein, how about yet another parameter, chain=false|true, that would allow to download just the chain (or, if the chain is the same for any certificate, another endpoint altogether.)

Why the above? I deploy certificates in dissimilar systems: Apache, Nginx, Icecast, and many more. Each of them have different semantics for injecting the certs: some like the bundles, others separated (Icecast even wants to have the certificate, chain and key in a single file.) So, having the option of getting all those components separately would make certera more versatile, IMO.

[certeraio]

Hi @carloscarnero! Thanks for the input and feedback. Greatly appreciated.

You certainly are correct that it would be more versatile. Today, the certificates endpoint returns the chain, which may not be what people want. Let me do some research on the best way to get just the certificate for the subject requested. I like the idea of the backwards compatible bundle parameter.

As for combining the key, it should be trivial to concatenate that after retrieving via curl, right?
After obtaining the certificate (whether bundled, i.e. whole chain, or single), you can do
cat key.pem cert.pem > combined.pem

[certeraio]

Hi @carloscarnero. I've created a new release, version 2.0.2 that contains the chain parameter. The default is true (or don't specify the parameter at all) and the chain is returned (same as what it has always done). When chain=false, only a single certificate is returned.

https://github.com/certera-io/certera/releases/tag/2.0.2-beta

[Carlos Alberto Carnero Delgado]

I confirm that this works!

However, I seem to missunderstand the documentation, in particular passing the query string parameters. The example shows

curl https://<your_certera_site_hostname>/api/certificate/<certificate_name> \
  -H "apiKey:<your_api_key>" \
  -d "staging=true&format=pfx&pfxPassword=$3cr3t"

But I think that -d sends the data in a POST request.

Adding the parameters to the URL works as expected or, alternatively, including the -G parameter that forces the request to be a GET. So I think the above block of documentation should be

curl https://<your_certera_site_hostname>/api/certificate/<certificate_name> \
  -H "apiKey:<your_api_key>" \
  -d "staging=true&format=pfx&pfxPassword=$3cr3t" -G

EDIT: I took the liberty of creating a pull request at certera-io/docs#1 that includes the -G parameter. Not sure if its OK, but... YOLO.

[certeraio]

Hi @carloscarnero
You are correct. I missed that parameter. Thanks for catching that. I had read this on my phone and fixed it before seeing your edit and PR. Thanks for submitting the PR, but I have closed it since I had previously fixed it!