Azure Functions App | Certificate Based API Calls

Question

Hi I have a Azure Function App in Java. I have a target system api call to be made from the function app.
how to send a certificate in api call from function apps ?

Where to store the certificate and how to access it ?

I want some references in Java.

Answer 1

Hi @Amar,
Welcome to the Microsoft Q&A Platform! Thank you for reaching out regarding Azure Functions App with Certificate Based API Calls.
To send a certificate in an API call from your Azure Function App in Java, you can follow these steps:

Store the Certificate

• Use Azure Key Vault: This is the recommended way to store certificates securely. You can integrate Azure Key Vault with your Function App to fetch the certificate at runtime.
• App Service Environment: You can also upload the certificate directly to your Function App using the Azure Portal under the TLS/SSL settings. This will allow the app to access the certificate via environment variables.

Access the Certificate:

If using Azure Key Vault:

• Configure a managed identity for your Function App.
• Grant access to the Key Vault for the managed identity.
• Use the Azure SDK in your Java code to fetch the certificate.

If stored in App Service:

• Use the environment variable WEBSITE_LOAD_CERTIFICATES to specify which certificates the app can access.
• Access the certificate via the Java Keystore.

Microsoft documentation on using certificates in Azure Functions provides detailed guidance on secure storage and usage, including how to set up the WEBSITE_LOAD_CERTIFICATES environment variable and Key Vault integration:
Key Vault references as app settings in Azure App Service and Azure Functions
Use a TLS/SSL certificate in your code in Azure App Service

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