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Login with Azure (Microsoft)

To enable Azure (Microsoft) Auth for your project, you need to set up an Azure OAuth application and add the application credentials to your Supabase Dashboard.

Overview#

Setting up OAuth with Azure consists of four broad steps:

  • Create an OAuth application under Azure Entra ID.
  • Add a secret to the application.
  • Add the Supabase Auth callback URL to the allowlist in the OAuth application in Azure.
  • Configure the client ID and secret of the OAuth application within the Supabase Auth dashboard.

Access your Azure Developer account#

  • Go to portal.azure.com.
  • Login and select Microsoft Entra ID under the list of Azure Services.

Register an application#

  • Under Microsoft Entra ID, select App registrations in the side panel and select New registration.
  • Choose a name and select your preferred option for the supported account types.
  • Specify a Web Redirect URI. It should should look like this: https://<project-ref>.supabase.co/auth/v1/callback
  • Finally, select Register at the bottom of the screen.

Register an application.

Obtain a Client ID and Secret#

  • Once your app has been registered, the client ID can be found under the list of app registrations under the column titled Application (client) ID.
  • You can also find it in the app overview screen.
  • Place the Client ID in the Azure configuration screen in the Supabase AUth dashboard.

Obtain the client ID

  • Select Add a certificate or secret in the app overview screen and open the Client secrets tab.
  • Select New client secret to create a new client secret.
  • Choose a preferred expiry time of the secret. Make sure you record this in your calendar days in advance so you have enough time to create a new one without suffering from any downtime.
  • Once the secret is generated place the Value column (not Secret ID) in the Azure configuration screen in the Supabase Auth dashboard.

Obtain the client secret

Guarding Against Unverified Email Domains#

Microsoft Entra ID can send out unverified email domains in certain cases. This may open up your project to a vulnerability where a malicious user can impersonate already existing accounts on your project.

This only applies in at least one of these cases:

  • You have configured the authenticationBehaviors setting of your OAuth application to allow unverified email domains
  • You are using an OAuth app configured as single-tenant in the supported account types
  • Your OAuth app was created before June 20th 2023 after Microsoft announced this vulnerability, and the app had used unverified emails prior

This means that most OAuth apps are not susceptible to this vulnerability.

Despite this, we recommend configuring the optional xms_edov claim on the OAuth app. This claim allows Supabase Auth to identify with certainty whether the email address sent over by Microsoft Entra ID is verified or not.

Configure this in the following way:

  • Select the App registrations menu in Microsoft Entra ID on the Azure portal.
  • Select the OAuth app.
  • Select the Manifest menu in the sidebar.
  • Make a backup of the JSON just in case.
  • Identify the optionalClaims key.
  • Edit it by specifying the following object:

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    "optionalClaims": {
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    "idToken": [
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    {
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    "name": "xms_edov",
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    "source": null,
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    "essential": false,
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    "additionalProperties": []
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    },
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    {
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    "name": "email",
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    "source": null,
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    "essential": false,
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    "additionalProperties": []
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    }
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    ],
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    "accessToken": [
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    {
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    "name": "xms_edov",
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    "source": null,
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    "essential": false,
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    "additionalProperties": []
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    }
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    ],
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    "saml2Token": []
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    },

  • Select Save to apply the new configuraion.

Configure a Tenant URL (Optional)#

A Microsoft Entra tenant is the directory of users who are allowed to access your project. This section depends on what your OAuth registration uses for Supported account types.

By default, Supabase Auth uses the common Microsoft tenant (https://login.microsoftonline.com/common) which generally allows any Microsoft account to sign in to your project. Microsoft Entra further limits what accounts can access your project depending on the type of OAuth application you registered.

If your app is registered as My organization only for the Supported account types you may want to configure Supabase Auth with the organization's tenant URL. This will use the tenant's authorization flows instead, and will limit access at the Supabase Auth level to Microsoft accounts arising from only the specified tenant.

Configure this by storing a value under Azure Tenant URL in the Supabase Auth provider configuration page for Azure that has the following format https://login.microsoftonline.com/<tenant-id>.

Add login code to your client app#

tip

Supabase Auth requires that Azure returns a valid email address. Therefore you must request the email scope in the signInWithOAuth method.

When your user signs in, call signInWithOAuth() with azure as the provider:


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async function signInWithAzure() {
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const { data, error } = await supabase.auth.signInWithOAuth({
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provider: 'azure',
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options: {
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scopes: 'email',
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},
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})
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}

When your user signs out, call signOut() to remove them from the browser session and any objects from localStorage:


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async function signOut() {
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const { error } = await supabase.auth.signOut()
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}

Obtain the provider refresh token#

Azure OAuth2.0 doesn't return the provider_refresh_token by default. If you need the provider_refresh_token returned, you will need to include the following scope:


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async function signInWithAzure() {
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const { data, error } = await supabase.auth.signInWithOAuth({
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provider: 'azure',
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options: {
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scopes: 'offline_access',
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},
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})
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}

Resources#

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