This is a hook for the Let's Encrypt ACME client dehydrated (previously known as letsencrypt.sh) that allows you to use CloudFlare DNS records to respond to dns-01 challenges. Requires Python and your CloudFlare account e-mail and API key being in the environment.
$ cd ~
$ git clone https://github.com/lukas2511/dehydrated
$ cd dehydrated
$ mkdir hooks
$ git clone https://github.com/kappataumu/letsencrypt-cloudflare-hook hooks/cloudflare
If you are using Python 3:
$ pip install -r hooks/cloudflare/requirements.txt
Otherwise, if you are using Python 2 (make sure to also check the urllib3 documentation for possible caveats):
$ pip install -r hooks/cloudflare/requirements-python-2.txt
Your account's CloudFlare email and API key are expected to be in the environment, so make sure to:
$ export CF_EMAIL='[email protected]'
$ export CF_KEY='K9uX2HyUjeWg5AhAb'
Optionally, you can specify the DNS servers to be used for propagation checking via the CF_DNS_SERVERS environment variable (props bennettp123):
$ export CF_DNS_SERVERS='8.8.8.8 8.8.4.4'
If you want more information about what is going on while the hook is running:
$ export CF_DEBUG='true'
Alternatively, these statements can be placed in dehydrated/config, which is automatically sourced by dehydrated on startup:
echo "export [email protected]" >> config
echo "export CF_KEY=K9uX2HyUjeWg5AhAb" >> config
echo "export CF_DEBUG=true" >> config
$ ./dehydrated -c -d example.com -t dns-01 -k 'hooks/cloudflare/hook.py'
#
# !! WARNING !! No main config file found, using default config!
#
Processing example.com
+ Signing domains...
+ Creating new directory /home/user/dehydrated/certs/example.com ...
+ Generating private key...
+ Generating signing request...
+ Requesting challenge for example.com...
+ CloudFlare hook executing: deploy_challenge
+ DNS not propagated, waiting 30s...
+ DNS not propagated, waiting 30s...
+ Responding to challenge for example.com...
+ CloudFlare hook executing: clean_challenge
+ Challenge is valid!
+ Requesting certificate...
+ Checking certificate...
+ Done!
+ Creating fullchain.pem...
+ CloudFlare hook executing: deploy_cert
+ ssl_certificate: /home/user/dehydrated/certs/example.com/fullchain.pem
+ ssl_certificate_key: /home/user/dehydrated/certs/example.com/privkey.pem
+ Done!
If you want some prose to go with the code, check out the relevant blog post here: From StartSSL to Let's Encrypt, using CloudFlare DNS.
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