Implement user authentication and authorization
In Azure, authentication and authorization are handled by the Microsoft Identity Platform, which is the central service that verifies who a user is and decides what they can do. The platform uses two main protocols: OpenID Connect for authentication (sign-in) and OAuth 2.0 for authorization (permissions). When a user tries to access an application, the app sends the user to the identity platform, where the user signs in with credentials such as a password or a multifactor code. The platform returns an ID token that proves the user’s identity and an access token that the app can use to call other APIs on the user’s behalf.
The Microsoft Authentication Library (MSAL) helps developers integrate these protocols into their applications. MSAL handles token acquisition, caching, and refresh, so the developer does not need to write the low-level protocol code. The library supports different application types, such as single-page apps, web apps, and mobile apps, each with a different token flow. For example, a web app uses the authorization code flow, while a single-page app uses the implicit flow or PKCE flow. The developer must register the application in Azure Active Directory (Azure AD), which creates a trust relationship between the app and the identity platform. The registration defines the app’s redirect URIs, permissions it requests, and the users who can sign in.
Implement secure Azure solutions
To protect data and secrets, Azure provides Azure Key Vault, a service that stores cryptographic keys, secrets (like connection strings), and certificates in a secure, central location. Applications access Key Vault through a managed identity, which is an Azure Active Directory identity automatically assigned to an Azure resource, such as a virtual machine or a web app. The managed identity removes the need to store credentials in code or configuration files. The resource requests a token from the Azure AD endpoint, and that token is used to authenticate to Key Vault. The Key Vault itself uses an access policy to control which identities can read or write specific secrets.
Another layer of security is App Service authentication, which integrates with Azure AD to require sign-in before users can reach the web app. The App Service platform handles authentication middleware, so the app code does not need to implement the login flow. For network-level protection, Azure Security Center (now part of Microsoft Defender for Cloud) provides unified security management and threat protection across Azure resources. It monitors configurations, recommends fixes, and alerts on suspicious activity. Together, these services create a layered security model: identity controls who can access the application, Key Vault protects secrets, and network policies limit traffic.
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