---
title: Network and Security Settings
sidebar_position: 7
version: 1
---

# Network and Security Settings

## CORS

:::note
In Superset versions prior to `5.x` you have to install to install `flask-cors` with `pip install flask-cors` to enable CORS support.
:::

The following keys in `superset_config.py` can be specified to configure CORS:

- `ENABLE_CORS`: Must be set to `True` in order to enable CORS
- `CORS_OPTIONS`: options passed to Flask-CORS
  ([documentation](https://flask-cors.readthedocs.io/en/latest/api.html#extension))

## HTTP headers

Note that Superset bundles [flask-talisman](https://pypi.org/project/talisman/)
Self-described as a small Flask extension that handles setting HTTP headers that can help
protect against a few common web application security issues.

## HTML Embedding of Dashboards and Charts

There are two ways to embed a dashboard: Using the [SDK](https://www.npmjs.com/package/@superset-ui/embedded-sdk) or embedding a direct link. Note that in the latter case everybody who knows the link is able to access the dashboard.

### Embedding a Public Direct Link to a Dashboard

This works by first changing the content security policy (CSP) of [flask-talisman](https://github.com/GoogleCloudPlatform/flask-talisman) to allow for certain domains to display Superset content. Then a dashboard can be made publicly accessible, i.e. **bypassing authentication**. Once made public, the dashboard's URL can be added to an iframe in another website's HTML code.

#### Changing flask-talisman CSP

Add to `superset_config.py` the entire `TALISMAN_CONFIG` section from `config.py` and include a `frame-ancestors` section:

```python
TALISMAN_ENABLED = True
TALISMAN_CONFIG = {
    "content_security_policy": {
    ...
 "frame-ancestors": ["*.my-domain.com", "*.another-domain.com"],
    ...
```

Restart Superset for this configuration change to take effect.

#### Making a Dashboard Public

There are two approaches to making dashboards publicly accessible:

**Option 1: Dataset-based access (simpler)**

1. Set `PUBLIC_ROLE_LIKE = "Public"` in `superset_config.py`
2. Grant the Public role access to the relevant datasets (Menu → Security → List Roles → Public)
3. All published dashboards using those datasets become visible to anonymous users

**Option 2: Dashboard-level access (selective control)**

1. Set `PUBLIC_ROLE_LIKE = "Public"` in `superset_config.py`
2. Add the `'DASHBOARD_RBAC': True` [Feature Flag](/admin-docs/configuration/feature-flags)
3. Edit each dashboard's properties and add the "Public" role
4. Only dashboards with the Public role explicitly assigned are visible to anonymous users

See the [Public role documentation](/admin-docs/security/#public) for more details.

#### Embedding a Public Dashboard

Now anybody can directly access the dashboard's URL. You can embed it in an iframe like so:

```html
<iframe
  width="600"
  height="400"
  seamless
  frameborder="0"
  scrolling="no"
  src="https://superset.my-domain.com/superset/dashboard/10/?standalone=1&height=400"
>
</iframe>
```

#### Embedding a Chart

A chart's embed code can be generated by going to a chart's edit view and then clicking at the top right on `...` > `Share` > `Embed code`

### Enabling Embedding via the SDK

Clicking on `...` next to `EDIT DASHBOARD` on the top right of the dashboard's overview page should yield a drop-down menu including the entry "Embed dashboard".

To enable this entry, add the following line to the `.env` file:

```text
SUPERSET_FEATURE_EMBEDDED_SUPERSET=true
```

### Hiding the Logout Button in Embedded Contexts

When Superset is embedded in an application that manages authentication via SSO (OAuth2, SAML, or JWT), the logout button should be hidden since session management is handled by the parent application.

To hide the logout button in embedded contexts, add to `superset_config.py`:

```python
FEATURE_FLAGS = {
    "DISABLE_EMBEDDED_SUPERSET_LOGOUT": True,
}
```

This flag only hides the logout button when Superset detects it is running inside an iframe. Users accessing Superset directly (not embedded) will still see the logout button regardless of this setting.

:::note
When embedding with SSO, also set `SESSION_COOKIE_SAMESITE = 'None'` and `SESSION_COOKIE_SECURE = True`. See [Security documentation](/admin-docs/security/securing_superset) for details.
:::

## CSRF settings

Similarly, [flask-wtf](https://flask-wtf.readthedocs.io/en/0.15.x/config/) is used to manage
some CSRF configurations. If you need to exempt endpoints from CSRF (e.g. if you are
running a custom auth postback endpoint), you can add the endpoints to `WTF_CSRF_EXEMPT_LIST`:

## SSH Tunneling

1. Turn on feature flag
   - Change [`SSH_TUNNELING`](https://github.com/apache/superset/blob/eb8386e3f0647df6d1bbde8b42073850796cc16f/superset/config.py#L489) to `True`
   - If you want to add more security when establishing the tunnel we allow users to overwrite the `SSHTunnelManager` class [here](https://github.com/apache/superset/blob/eb8386e3f0647df6d1bbde8b42073850796cc16f/superset/config.py#L507)
   - You can also set the [`SSH_TUNNEL_LOCAL_BIND_ADDRESS`](https://github.com/apache/superset/blob/eb8386e3f0647df6d1bbde8b42073850796cc16f/superset/config.py#L508) this the host address where the tunnel will be accessible on your VPC

2. Create database w/ ssh tunnel enabled
   - With the feature flag enabled you should now see ssh tunnel toggle.
   - Click the toggle to enable SSH tunneling and add your credentials accordingly.
     - Superset allows for two different types of authentication (Basic + Private Key). These credentials should come from your service provider.

3. Verify data is flowing
   - Once SSH tunneling has been enabled, go to SQL Lab and write a query to verify data is properly flowing.

## Domain Sharding

:::note
Domain Sharding is deprecated as of Superset 5.0.0, and will be removed in Superset 6.0.0. Please Enable HTTP2 to keep more open connections per domain.
:::

Chrome allows up to 6 open connections per domain at a time. When there are more than 6 slices in
dashboard, a lot of time fetch requests are queued up and wait for next available socket.
[PR 5039](https://github.com/apache/superset/pull/5039) adds domain sharding to Superset,
and this feature will be enabled by configuration only (by default Superset doesn’t allow
cross-domain request).

Add the following setting in your `superset_config.py` file:

- `SUPERSET_WEBSERVER_DOMAINS`: list of allowed hostnames for domain sharding feature.

Please create your domain shards as subdomains of your main domain for authorization to
work properly on new domains. For Example:

- `SUPERSET_WEBSERVER_DOMAINS=['superset-1.mydomain.com','superset-2.mydomain.com','superset-3.mydomain.com','superset-4.mydomain.com']`

or add the following setting in your `superset_config.py` file if domain shards are not subdomains of main domain.

- `SESSION_COOKIE_DOMAIN = '.mydomain.com'`

## Middleware

Superset allows you to add your own middleware. To add your own middleware, update the
`ADDITIONAL_MIDDLEWARE` key in your `superset_config.py`. `ADDITIONAL_MIDDLEWARE` should be a list
of your additional middleware classes.

For example, to use `AUTH_REMOTE_USER` from behind a proxy server like nginx, you have to add a
simple middleware class to add the value of `HTTP_X_PROXY_REMOTE_USER` (or any other custom header
from the proxy) to Gunicorn’s `REMOTE_USER` environment variable.
