# Duo

Use these instructions to set up Duo as your SSO provider for Tonic Structural.

## **Duo configuration** <a href="#sso-duo-configuration" id="sso-duo-configuration"></a>

To indicate to use Duo as an SSO provider for Structural:

1. On the **Applications** page, click **Add application**.

<figure><img src="/files/eiYzmOwomrXig7Etd4ed" alt=""><figcaption><p>Applications list in Duo</p></figcaption></figure>

2. In the application types list, click **Web SDK**.

<figure><img src="/files/d9Ikl1CpAeydPhRCT1vA" alt=""><figcaption><p>Application types for Duo</p></figcaption></figure>

3. On the application details page, configure the application.

<figure><img src="/files/ROavswNJEQoaVqRFnQDo" alt=""><figcaption><p>Application details</p></figcaption></figure>

You will use the following values in the Structural configuration:

* **Client ID -** The client identifier for Web SDK.
* **Client secret -** The client secret for Web SDK.
* **API hostname -** The Duo domain, which is essentially the URL to your Duo instance: `admin-<identifier>.duosecurity.com`.

## Structural **configuration** <a href="#sso-duo-tonic-configuration" id="sso-duo-tonic-configuration"></a>

To configure Duo SSO, use the following [environment settings](/app/admin/environment-variables-setting.md).

* `TONIC_SSO_PROVIDER` -  `Duo`
* `TONIC_SSO_CLIENT_ID` - The client ID for Web SDK. This is the value of **Client ID**.
* `TONIC_SSO_CLIENT_SECRET` - The client secret for Web SDK. This is the value of **Client secret**.
* `TONIC_SSO_DOMAIN` - The Duo domain. This is the value of **API hostname**.
* `TONIC_SSO_GROUP_FILTER_REGEX` - Identifies the allowed groups for Structural. For details, go to [Synchronizing SSO groups with Structural](/app/admin/tonic-user-access/single-sign-on/sso-limit-groups.md).


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