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Home Assistant Add-on: Letsencrypt

Installation

Follow these steps to get the add-on installed on your system:

  1. Navigate in your Home Assistant frontend to Supervisor -> Add-on Store.
  2. Find the "letsencrypt" add-on and click it.
  3. Click on the "INSTALL" button.

How to use

To use this add-on, you have two options on how to get your certificate:

1. HTTP challenge

  • Requires Port 80 to be available from the internet and your domain assigned to the externally assigned IP address
  • Doesn’t allow wildcard certificates (*.yourdomain.com).

2. DNS challenge

  • Requires you to use one of the supported DNS providers (See "Supported DNS providers" below)
  • Allows to request wildcard certificates (*.yourdomain.com)
  • Doesn’t need you to open a port to your Home Assistant host on your router.

You always need to provide the following entries within the configuration

email: your@email.com
domains:
  # use "*.yourdomain.com" for wildcard certificates.
  - yourdomain.com
challenge: http OR dns

IF you choose dns as challenge, you will also need to fill:

# Add the dnsprovider of your choice from the list of "Supported DNS providers" below
dns:
  provider: ""

In addition add the fields according to the credentials required by your DNS provider:

propagation_seconds: 60
azure_config: ''
cloudflare_email: ''
cloudflare_api_key: ''
cloudflare_api_token: ''
cloudxns_api_key: ''
cloudxns_secret_key: ''
digitalocean_token: ''
directadmin_url: ''
directadmin_username: ''
directadmin_password: ''
dnsimple_token: ''
dnsmadeeasy_api_key: ''
dnsmadeeasy_secret_key: ''
google_creds: ''
hetzner_api_token: ''
gehirn_api_token: ''
gehirn_api_secret: ''
linode_key: ''
linode_version: ''
luadns_email: ''
luadns_token: ''
njalla_token: ''
nsone_api_key: ''
ovh_endpoint: ''
ovh_application_key: ''
ovh_application_secret: ''
ovh_consumer_key: ''
rfc2136_server: ''
rfc2136_port: ''
rfc2136_name: ''
rfc2136_secret: ''
rfc2136_algorithm: ''
aws_access_key_id: ''
aws_secret_access_key: ''
sakuracloud_api_token: ''
sakuracloud_api_secret: ''
netcup_customer_id: ''
netcup_api_key: ''
netcup_api_password: ''
gandi_api_key: ''
gandi_sharing_id: ''
transip_username: ''
transip_api_key: ''

Advanced

Changing the ACME Server

By default, The addon uses Let’s Encrypt’s default server at https://acme-v02.api.letsencrypt.org/. You can instruct the addon to use a different ACME server by providing the field acme_server with the URL of the server’s ACME directory:

acme_server: 'https://my.custom-acme-server.com'

If your custom ACME server uses a certificate signed by an untrusted certificate authority (CA), you can add the root certificate to the trust store by setting its content as an option:

acme_server: 'https://my.custom-acme-server.com'
acme_root_ca_cert: |
  -----BEGIN CERTIFICATE-----
  MccBfTCCASugAwIBAgIRAPPIPTKNBXkBozsoE46UPZcwCGYIKoZIzj0EAwIwHTEb...kg==
  -----END CERTIFICATE-----

Example Configurations

HTTP challenge 
email: your.email@example.com
domains:
  - home-assistant.io
certfile: fullchain.pem
keyfile: privkey.pem
challenge: http
dns: {}
DNS challenge 
email: your.email@example.com
domains:
  - home-assistant.io
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-cloudflare
  cloudflare_email: your.email@example.com
  cloudflare_api_key: 31242lk3j4ljlfdwsjf0
Azure DNS challenge 
email: your.email@example.com
domains:
  - home-assistant.io
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-azure
  azure_creds: azure.txt

Please copy your credentials file "azure.txt" into the "share" shared folder on the Home Assistant host before starting the service. One way is to use the "Samba" add on to make the folder available via network or SSH Add-on. You can find information on the required file format in the documentation for the Certbot Azure plugin.

To use this plugin, create an Azure Active Directory app registration and service principal; add a client secret; and create a credentials file using the above directions. Grant the app registration DNS Zone Contributor on the DNS zone to be used for authentication.

Google DNS challenge 
email: your.email@example.com
domains:
  - home-assistant.io
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-google
  google_creds: google.json

Please copy your credentials file "google.json" into the "share" shared folder on the Home Assistant host before starting the service.

One way is to use the "Samba" add on to make the folder available via network or SSH Add-on.

The credential file can be created and downloaded when creating the service user within the Google cloud. You can find additional information regarding the required permissions in the "credentials" section here:

https://github.com/certbot/certbot/blob/master/certbot-dns-google/certbot_dns_google/__init__.py

route53 DNS challenge 
email: your.email@example.com
domains:
  - home-assistant.io
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-route53
  aws_access_key_id: 0123456789ABCDEF0123
  aws_secret_access_key: 0123456789abcdef0123456789/abcdef0123456

For security reasons, don't use your main account's credentials. Instead, add a new AWS user with Access Type: Programmatic access and use that user's access key. Assign a minimum policy like the following example. Make sure to replace the Resource ARN in the first statement to your domain's hosted zone ARN or use * for all.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "ChangeSpecificDomainsRecordSet",
            "Effect": "Allow",
            "Action": "route53:ChangeResourceRecordSets",
            "Resource": "arn:aws:route53:::hostedzone/01234567890ABC"
        },
        {
            "Sid": "ListAllHostedZones",
            "Effect": "Allow",
            "Action": "route53:ListHostedZones",
            "Resource": "*"
        },
        {
            "Sid": "ReadChanges",
            "Effect": "Allow",
            "Action": "route53:GetChange",
            "Resource": "arn:aws:route53:::change/*"
        }
    ]
}
CloudFlare

Previously, Cloudflare’s “Global API Key” was used for authentication, however this key can access the entire Cloudflare API for all domains in your account, meaning it could cause a lot of damage if leaked.

Cloudflare’s newer API Tokens can be restricted to specific domains and operations, and are therefore now the recommended authentication option. The API Token used for Certbot requires only the Zone:DNS:Edit permission for the zone in which you want a certificate.

Example credentials file using restricted API Token (recommended):

dns:
  provider: dns-cloudflare
  cloudflare_api_token: 0123456789abcdef0123456789abcdef01234

Example credentials file using Global API Key (not recommended):

dns:
  provider: dns-cloudflare
  cloudflare_email: cloudflare@example.com
  cloudflare_api_key: 0123456789abcdef0123456789abcdef01234
Linode

To use this addon with Linode DNS, first create a new API/access key, with read/write permissions to DNS; no other permissions are needed. Newly keys will likely use API version '4.' Important: single quotes are required around the linode_version number; failure to do this will cause a type error (as the addon expects a string, not an integer).

email: you@mailprovider.com
domains:
  - ha.yourdomain.com
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-linode
  linode_key: 865c9f462c7d54abc1ad2dbf79c938bc5c55575fdaa097ead2178ee68365ab3e
  linode_version: '4'
DirectAdmin

It is recommended to create a login key in the DirectAdmin control panel to be used as value for directadmin_password. Instructions on how to create such key can be found at https://help.directadmin.com/item.php?id=523.

Make sure to grant the following permissions:

  • CMD_API_LOGIN_TEST
  • CMD_API_DNS_CONTROL
  • CMD_API_SHOW_DOMAINS

Username and password can also be used in case your DirectAdmin instance has no support for login keys.

Example configuration:

email: mail@domain.tld
domains:
  - your.domain.tld
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  propagation_seconds: 60
  provider: dns-directadmin
  directadmin_url: 'https://domain.tld:2222/'
  directadmin_username: da_user
  directadmin_password: da_password_or_key
Njalla

You need to generate an API token inside Settings > API Access or directly at https://njal.la/settings/api/. If you have a static IP-address restrict the access to your IP. I you are not sure, you probably don't have a static IP-address.

Example configuration:

email: your.email@example.com
domains:
  - home-assistant.io
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-njalla
  njalla_token: 0123456789abcdef0123456789abcdef01234567
TransIP

You will need to generate an API key from the TransIP Control Panel at https://www.transip.nl/cp/account/api/.

The propagation limit will be automatically raised to 240 seconds.

Example configuration:

email: your.email@example.com
domains:
  - your.domain.tld
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-transip
  transip_username: transip-user
  transip_api_key: |
    -----BEGIN PRIVATE KEY-----
    MII..ABCDEFGHIJKLMNOPQRSTUVWXYZ
    AAAAAABCDEFGHIJKLMNOPQRSTUVWXYZ
    -----END PRIVATE KEY-----
OVH

You will need to generate an OVH API Key first at https://eu.api.ovh.com/createToken/ (for Europe) or https://ca.api.ovh.com/createToken/ (for north America).

When creating the API Key, you must ensure that the following rights are granted:

  • GET /domain/zone/*
  • PUT /domain/zone/*
  • POST /domain/zone/*
  • DELETE /domain/zone/*

Example configuration

email: your.email@example.com
domains:
  - home-assistant.io
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-ovh
  ovh_endpoint: ovh-eu
  ovh_application_key: 0123456789abcdef0123456789abcdef01234
  ovh_application_secret: 0123456789abcdef0123456789abcdef01234
  ovh_consumer_key: 0123456789abcdef0123456789abcdef01234

Use ovh_endpoint: ovh-ca for north America region.

RFC2136

You will need to set up a server with RFC2136 (Dynamic Update) support with a TKEY (to authenticate the updates). How to do this will vary depending on the DNS server software in use. For Bind9, you first need to first generate an authentication key by running

$ dnssec-keygen -a HMAC-SHA512 -b 512 -n HOST letsencrypt
Kletsencrypt.+165+20675

The key file (Kletsencrypt.+165+20675.key in this example) looks like the following:

$ cat Kletsencrypt.+165+20675.key
letsencrypt. IN KEY 512 3 165 Cj2SJThIYZqZO39HIOA8dYryzsLT3CI+m43m3yfGfTMvpyYw5DXjn5da hokrwyLe3MTboGkloKIsT6DUcTSdEA==

You don't need to publish this; just copy the key data into your named.conf file:


key "letsencrypt" {
  algorithm hmac-sha512;
  secret "Cj2SJThIYZqZO39HIOA8dYryzsLT3CI+m43m3yfGfTMvpyYw5DXjn5da hokrwyLe3MTboGkloKIsT6DUcTSdEA==";
};

And ensure you have an update policy in place in the zone that uses this key to enable update of the correct domain (which must match the domain in your yaml configuration):


   update-policy {
      grant letsencrypt name _acme-challenge.home-assistant.io. txt;
   };

For this provider, you will need to supply all the rfc2136_* options. Note that the rfc2136_port item is required (there is no default port in the add-on) and, most importantly, the port number must be quoted. Also, be sure to copy in the key so certbot can authenticate to the DNS server. Finally, the algorithm should be in all caps.

An example configuration:

email: your.email@example.com
domains:
  - home-assistant.io
certfile: fullchain.pem
keyfile: privkey.pem
challenge: dns
dns:
  provider: dns-rfc2136
  rfc2136_server: dns-server.dom.ain
  rfc2136_port: '53'
  rfc2136_name: letsencrypt
  rfc2136_secret: "secret-key"
  rfc2136_algorithm: HMAC-SHA512

Certificate files

The certificate files will be available within the "ssl" share after successful request of the certificates.

By default other addons are referring to the correct path of the certificates. You can in addition find the files via the "samba" addon within the "ssl" share.

Supported DNS providers

dns-azure
dns-cloudflare
dns-cloudxns
dns-digitalocean
dns-directadmin
dns-dnsimple
dns-dnsmadeeasy
dns-gehirn
dns-google
dns-hetzner
dns-linode
dns-luadns
dns-njalla
dns-nsone
dns-ovh
dns-rfc2136
dns-route53
dns-sakuracloud
dns-netcup
dns-gandi
dns-transip

Support

Got questions?

You have several options to get them answered:

In case you've found a bug, please open an issue on our GitHub.