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Merge pull request #3263 from peschmae/feature/acme-http-documentation 

Add documentation for ACME http-01 challenge
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Hossein Shafagh 2020-11-23 13:27:11 -08:00 committed by GitHub
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docs/production/index.rst
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@ -415,8 +415,8 @@ And the worker can be started with desired options such as the following::
supervisor or systemd configurations should be created for these in production environments as appropriate.
Add support for LetsEncrypt
===========================
Add support for LetsEncrypt/ACME
================================
LetsEncrypt is a free, limited-feature certificate authority that offers publicly trusted certificates that are valid
for 90 days. LetsEncrypt does not use organizational validation (OV), and instead relies on domain validation (DV).
@ -424,7 +424,10 @@ LetsEncrypt requires that we prove ownership of a domain before we're able to is
time we want a certificate.
The most common methods to prove ownership are HTTP validation and DNS validation. Lemur supports DNS validation
through the creation of DNS TXT records.
through the creation of DNS TXT records as well as HTTP validation, reusing the destination concept.
ACME DNS Challenge
------------------
In a nutshell, when we send a certificate request to LetsEncrypt, they generate a random token and ask us to put that
token in a DNS text record to prove ownership of a domain. If a certificate request has multiple domains, we must
@ -462,6 +465,24 @@ possible. To enable this functionality, periodically (or through Cron/Celery) ru
This command will traverse all DNS providers, determine which zones they control, and upload this list of zones to
Lemur's database (in the dns_providers table). Alternatively, you can manually input this data.
ACME HTTP Challenge
-------------------
The flow for requesting a certificate using the HTTP challenge is not that different from the one described for the DNS
challenge. The only difference is, that instead of creating a DNS TXT record, a file is uploaded to a Webserver which
serves the file at `http://<domain>/.well-known/acme-challenge/<token>`
Currently the HTTP challenge also works without Celery, since it's done while creating the certificate, and doesn't
rely on celery to create the DNS record. This will change when we implement mix & match of acme challenge types.
To create a HTTP compatible Authority, you first need to create a new destination that will be used to deploy the
challenge token. Visit `Admin` -> `Destination` and click `Create`. The path you provide for the destination needs to
be the exact path that is called when the ACME providers calls ``http://<domain>/.well-known/acme-challenge/`. The
token part will be added dynamically by the acme_upload.
Currently only the SFTP and S3 Bucket destination support the ACME HTTP challenge.
Afterwards you can create a new certificate authority as described in the DNS challenge, but need to choose
`Acme HTTP-01` as the plugin type, and then the destination you created beforehand.
LetsEncrypt: pinning to cross-signed ICA
----------------------------------------