Add-on security

Home Assistant rates every add-on based on the wanted rights. An add-on with a rating of 6 is very secure. If an add-on has a rating of 1, you shouldn't run this add-on unless you are 100% sure that you can trust the source.

API role

For access to the Supervisor API you need to define a role or run in default mode. This is only required for the Supervisor API and not the Home Assistant proxy. All of the roles already have access to the default API calls, and do not require any additional settings.

Available roles

Role	Description
default	Have access to all info calls
homeassistant	Can access all Home Assistant API endpoints
backup	Can access all backup API endpoints
manager	Is for Add-ons that run CLIs and need extended rights
admin	Have access to every API call. That is the only one they can disable/enable the Add-on protection mode

Codenotary CAS

You can sign your images and also verify our base image which you build from to provide a full chain of trust. This feature is supported by our Builder and the build config. To enable this feature on the Supervisor for your add-on, you simply need to add your email address to the add-on configuration codenotary.

Protection

Default, all add-ons run in protection enabled mode. This mode prevents the add-on from getting any rights on the system. If an add-on requires more rights, you can disable this protection via the API add-on options for that add-on. But be careful, an add-on with disabled protection can destroy your system!

Making a secure add-on

As a developer, follow the following best practices to make your add-on secure:

• Don't run on host network
• Create an AppArmor profile
• Map folders read only if you don't need write access
• If you need any API access, make sure that you do not grant permission that aren't needed
• Sign the image with Codenotary CAS

Use Home Assistant user backend

Instead of allowing users to set new login credentials in plain text config, use the Home Assistant Auth backend. You can enable the access to the API with auth_api: true. Now you are able to send the login credentials to the auth backend and validate them in Home Assistant.

Authenticating a user when using ingress

When the addon is accessed via the supervisor's ingress, the authorized user can be identified by its session token. The supervisor then adds some headers identifying the user to every request:

Header name	Description
X-Remote-User-Id	ID of the authenticated Home Assistant user
X-Remote-User-Name	The username of the authenticated user
X-Remote-User-Display-Name	The display name of the authenticated user