ACME webhook using the dns-lexicon python library

The python library lexicon supports many different DNS providers; by using it we can create a cert-manager DNS01 solver which works for any of those!

As of when this was last updated, the providers supported were:

The current supported providers are:

• Aliyun.com
• AuroraDNS
• AWS Route53
• Azure DNS
• Cloudflare
• ClouDNS
• CloudXNS
• ConoHa
• Constellix
• DigitalOcean
• Dinahosting
• DirectAdmin
• DNSimple v1, v2
• DnsMadeEasy
• DNSPark
• DNSPod
• Dreamhost
• Dynu
• EasyDNS
• Easyname
• EUserv
• ExoScale
• Gandi RPC (old) / LiveAPI
• Gehirn
• Glesys
• GoDaddy
• Google Cloud DNS
• Gransy (sites subreg.cz, regtons.com and regnames.eu)
• Hover
• Hurricane Electric DNS
• Hetzner
• Infoblox
• Infomaniak
• Internet.bs
• INWX
• Joker.com
• Linode
• Linode v4
• LuaDNS
• Memset
• Mythic Beasts (v2 API)
• Njalla
• Namecheap
• Namesilo
• Netcup
• NFSN (NearlyFreeSpeech)
• NS1
• OnApp
• Online
• OVH
• Plesk
• PointHQ
• PowerDNS
• Rackspace
• Rage4
• RcodeZero
• RFC2136
• Sakura Cloud by SAKURA Internet Inc.
• SafeDNS by UKFast
• SoftLayer
• Transip
• UltraDNS
• Value-Domain
• Vercel
• Vultr
• WebGo
• Yandex
• Zilore
• Zonomi

Though all of these should be supported I haven't tested all of them, just the ones that I use. I have left logging on pretty heavily in the webhook which should help with any troubleshooting.

Installation

helm -n cert-manager upgrade -i dns-lexicon-webhook ./deploy/cert-manager-dns-lexicon-webhook --set groupName='dns-lexicon.mycompany.com'

And then create a ClusterIssuer, something like this:

apiVersion: v1
kind: Secret
metadata:
  name: namecheap-api-key
  namespace: cert-manager
type: Opaque
stringData:
  key: myusername
  secret: myapikey
---
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: namecheap-lexicon
spec:
  acme:
    email: [email protected]
    privateKeySecretRef:
      name: mySecretKeySecret
    server: https://acme-v02.api.letsencrypt.org/directory
    solvers:
    - dns01:
        cnameStrategy: Follow
        webhook:
          config:
            apiKeyRef:
              name: namecheap-api-key
              key: key
            apiSecretRef:
              name: namecheap-api-key
              key: secret
            production: true
            provider: namecheap
            usePassword: false
            ttl: 600
          groupName: dns-lexicon.company.com
          solverName: lexicon

You should be able to create additional ones for each DNS provider you need using this basic template. Note that some providers use the --auth-password parameter instead of --auth-token; in that case you need to set usePassword: true in the webhook configuration to make it work. The only way I know to check that easily is to run lexicon <provider> --help and check the available arguments, but this project does not do that for you at this time.

Credits

Credit where it is due, this project was based on the cert-manager-webhook-example project and borrowed a lot of ideas and a bit of code from the dnsmadeeasy-webhook webhook.

This was the first golang project I've made, so there are probably things that could be improved -- any assistance with maintenance would be appreciated.

Long term goal

It is my sincere hope that this project will become unnecessary and (cert-manager will add built-in support)[cert-manager/cert-manager#4979].