Restrict User Login for Your Application

In this scenario, you aim to enable passwordless login exclusively for specific email addresses, such as those within your company. By updating the default Presentation Definition and modifying the PEX query with a filter, you can restrict access to your application.

Before you begin

1. Set up Affinidi Vault account. Follow the guide below if you haven’t set it up yet.

Set up Affinidi Vault

Set up an Affinidi Vault account using the Web Vault or install the Mobile Vault (for Android).

The same setup steps for Mobile Vault.

1. Click on Get started if you are creating a new account, or click on Restore from Backup if you have an existing backup of your Affinidi Vault. Provide the Passphrase to secure your Affinidi Vault.

You have the option to enable Biometrics to unlock your Affinidi Vault easily instead of using Passphrase.

2. Enter your email address to register with the Affinidi Vault. An OTP will be sent to this email for verification.

3. Enter the OTP sent to the email you have provided for verification to complete the setup.

After successfully providing the OTP, you are redirected to the Affinidi Vault dashboard.

Vault Passphrase

Remember to keep your passphrase in a secure location. Use the Passphrase Reset feature in Affinidi Vault settings to generate the PDF files and keep them safe, which you can use to recover access to your Affinidi Vault if you forget your passphrase.

2. Get the Redirect URL of your application for OIDC. This URL is configured on your Login Configuration to receive the idToken after successful authorisation.

3. Optionally, install the Affinidi CLI. Follow the guide below if you haven’t installed yet.

Set up Affinidi CLI

1. Download and install NodeJS on your machine if you haven’t set it up yet.

Node Version

Affinidi CLI requires Node version 18 and above.

2. Install Affinidi CLI using Node Package Manager (npm).

npm install -g @affinidi/cli

3. Verify that the installation is successful.

affinidi --version

Create Login Configuration

4. To create a Login Configuration, you can either use Affinidi CLI or  Affinidi Portal.

Expand the section below for your preferred method:

affinidi start

affinidi login create-config \
--name='<Name>' \
--redirect-uris='<Redirect URIs>'

{
  "ari": "ari:identity:ap-southeast-1:687b8872-a618-dt63-8978-e72ac32daeb1:login_configuration/c4f74d936cd31bde1c1fd3c1050bb76s",
  "projectId": "687b8872-a618-4e52-8978-e72ac32daec2",
  "configurationId": "c4f74d936cd31bde1c1fd3c1050bb62d",
  "name": "...",
  "auth": {
    "clientId": "<AUTH.CLIENT_ID>",
    "clientSecret": "<AUTH.CLIENT_SECRET>",
    "issuer": "https://<PROJECT_ID>.apse1.login.affinidi.io"
  },
  "redirectUris": [
    "..."
  ],
  "clientMetadata": {
    "name": "Login Config Name",
    "logo": "https://login.affinidi.com/default-client-logo.svg",
    "origin": "https://example.com"
  },
  "creationDate": "2023-08-11T06:26:37Z",
  "tokenEndpointAuthMethod": "client_secret_post"
}

Using Affinidi Portal

1. Go to  Affinidi Login under the Services section.

2. Click on the Create Login Configuration and provide the required details.

• Name is the string that describes your login configuration.
• Redirect URIs is the URL on your application where the user gets redirected after the successful authentication.

3. Click on create and confirm if all the details are correct.

4. After confirming the details, another popup shows the Client ID and Client Secret for your Login Configuration. Copy the generated Client Credentials and use them to integrate with Affinidi Login.

5. After copying the Client ID and Client Secret and closing the popup, you are redirected back to the Affinidi Login page.

Login Configuration uses a default Presentation Definition (presentationDefinition) and ID Token Mapping (idTokenMapping) to request the user’s email address during the authentication flow.

You can modify these defaults using  Affinidi Portal and Affinidi CLI to have additional authentication requirements and request other data from the user. See this documentation.

Update Presentation Definition

5. To restrict users who can log in to your application based on the email address domain using Affinidi Login, you need to update the default presentation definition of the Login Configuration previously created and add a data filter.

{
  "id": "vp_token_with_email_vc",
  "input_descriptors": [
    {
      "id": "email_vc",
      "name": "Email VC",
      "purpose": "Check if data contains necessary fields",
      "constraints": {
        "fields": [
          {
            "path": [
              "$.type"
            ],
            "purpose": "Check if VC type is correct",
            "filter": {
              "type": "array",
              "contains": {
                "type": "string",
                "pattern": "^Email$"
              }
            }
          },
          {
            "path": [
              "$.credentialSubject.email"
            ],
            "purpose": "Check if VC contains email field",
            "filter": {
              "type": "string",
              "pattern": ".+@companyemail.com$"
            }
          },
          {
            "path": [
              "$.issuer"
            ],
            "purpose": "Check if VC Issuer is Trusted",
            "filter": {
              "type": "string",
              "pattern": "^did:key:zQ3shtMGCU89kb2RMknNZcYGUcHW8P6Cq3CoQyvoDs7Qqh33N"
            }
          }
        ]
      }
    }
  ]
}

Based on the above Presentation Definition, we have added a filter only to accept email addresses from specific domains when authenticating users.

To update the Presentation Definition, you can either use  Affinidi Portal to edit the Login Configuration using the PEX query editor found in the Additional Configuration section or use Affinidi CLI using the following command:

affinidi login update-config \
--id=<LOGIN_CONFIG_ID> \
--file=<JSON_PAYLOAD>

Copy the JSON payload above and replace the email address pattern where you want to restrict the login.

See this documentation to learn more about modifying the Presentation Definition to define additional user requirements.

Set up Your Application

6. Go to your application’s OIDC settings and configure the following details to integrate Affinidi Login into your application’s login flow:

{
  "clientId": "<AUTH.CLIENT_ID>",
  "clientSecret": "<AUTH.CLIENT_SECRET>",
  "scope": "openid offline_access",
  "authorizationUrl": "<AUTH.ISSUER>/oauth2/auth",
  "tokenUrl": "<AUTH.ISSUER>/oauth2/token"
}

If you are using libraries or plugins to enable OIDC flow on your application, please refer to their documentation on configuring these details and allowing OIDC login.

Once you have completed the set-up of your application with client credentials and enabled the Affinidi Login, only users with an email address domain that matches the pattern defined in the Presentation Definition from their Affinidi Vault are allowed to log in.

You can explore our labs to learn more about ways to integrate Affinidi Login using other frameworks and IDP solutions.