REST API Authentication On Atlassian using Azure B2C as OAuth Provider

Step 1: Configure Azure B2C  server:

• Sign in to Azure portal.
• Go to Home and search Azure B2C in search bar and select Azure AD B2C.

• Click on Applications and then on Add option to add a new application.

• Configure following options to create new application.
  • Enter a name for your application under the Name text field.
  • Select Yes from the options in front of Web APP and Yes from options in front of Allow Implicit Flow.
  • Copy Callback URL from the miniOrange OAuth Client plugin (Configure OAuth tab) and save it under the Reply URL textbox.
  • Click on the Create button to create your application.

• Click on the Applications option under the Manage Menu in the left navigation bar and you will find your application listed there. Click on your application.

• Copy your Application ID and save it. Then, click on the Keys option to generate a key. This will be your ClientID and Client Secret. Also Copy the Directory ID this will be your Tenant ID.

Step 2: Fetch Access token through POSTMAN:

• Open the Postman Application (Here is the link to download Postman Application).
• Go to Authorization tab.
• From the dropdown select type as OAuth 2.0 and  click on Get access token.
• Add the following information from the table below.
• Postman starts the authentication flow and prompts you to use the access token.
• Select Add token to the header.

• Copy the Access Token or click on Use Token.

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Step 3: Fetch Username through Azure B2C:

• Choose the method type as "GET".
• Enter the interoception Endpoint from the plugin to fetch the username in the Request URL. For Azure B2C it is "https://login.windows.net/common/openid/userinfo".
• Go to the Authorization tab select the Bearer Token and enter the access token here.
• Add the header "content-type: application/json" and click on Send.

     curl 
     -X GET 
     -H "Authorization: Bearer <Access Token>" 
     -H "Content-type: application/json" 
     https://login.windows.net/common/openid/userinfo

Step 4 :Configure the Rest API plugin:

Step 1: Enable Rest API Authentication:

• After installing the app, navigate to the Global Settings tab.
• Here you will have to Enable the Authentication through Enable REST API Authentication and click on Save.
• Go to the OAuth/OIDC tab and in the dropdown provided select Azure B2C as the OAuth provider.
• Enter the attribute value against which we received the username in the Postman response.
• Save the settings.

Step 2: Disable Basic Authentication:

• Disabling this will restrict all the REST API call made using Basic Authentication.

Step 5: Test REST API using access token:

• Call any REST API. Include the access token in the Authorization header. Here’s an example of fetching content from Confluence.
• Go to the Postman application select method type as GET and enter the Request URL. For eg. http://{Confluence_Base_URL}/confluence/rest/api/content/
• In the Authorization tab select type as Bearer Token.

• In the Header tab add the header “content-type: application/json and send the request.

     curl 
     -X GET  
     -H "Authorization: Bearer <Access Token>" 
     -H "Content-type: application/json" 
     http://{confluence_base_url}/confluence/rest/api/content/

• This will show the content in Confluence and will return the status 200.
• If the token is invalid or missing, the call will return a 401 Unauthorized response

Additional Resources

• Rest API Authentication Methods?
• Azure B2C as OAuth Provider/OpenID Connect
• Frequently Asked Questions (FAQs)