Conditional Access Session Control
What Are Session Controls?
Session Controls in Conditional Access policies help organizations manage user behavior during an active session. These controls are useful when you want to allow access to a resource but want to enforce additional security or monitoring during that session.
Unlike Grant Controls, which determine whether access is allowed or blocked, Session Controls define what a user can do after access is granted. They work by integrating with Microsoft Defender for Cloud Apps to enforce real-time policies, limit actions, and monitor for suspicious activity.
Types of Session Controls
There are three primary types of Session Controls that you can configure in Conditional Access:
Monitor and Control with Conditional Access App Control: This session control allows real-time monitoring of user activities within an app, such as restricting actions like downloading or copying files based on user context (e.g., device, location).
Sign-in Frequency: This session control defines how often users must reauthenticate within an active session, ensuring that long-running sessions are periodically verified.
Persistent Browser Session: This control determines whether users need to reauthenticate across multiple browser sessions or if their session should persist, even after closing the browser.
In this lesson, we’ll focus on Conditional Access App Control, which offers the most advanced session monitoring and restriction capabilities.
Introduction to Microsoft Defender for Cloud Apps
Microsoft Defender for Cloud Apps (formerly known as Microsoft Cloud App Security) is a cloud access security broker (CASB) that provides comprehensive visibility, data controls, and threat protection across cloud apps. It integrates with Conditional Access to enforce real-time monitoring and control of user sessions.
When you configure Conditional Access App Control, Microsoft Defender for Cloud Apps allows you to:
Monitor user activity within a cloud app.
Enforce restrictions on specific actions (e.g., downloading, printing, or copying files).
Apply risk-based controls during the session if abnormal behavior is detected.
This real-time monitoring is particularly useful for protecting sensitive data while allowing users to access apps and complete tasks.
How Conditional Access App Control Works
Conditional Access App Control uses reverse proxy technology to monitor and control user actions within a session. When a session control policy is triggered, all user traffic is routed through Microsoft Defender for Cloud Apps, allowing it to inspect and control user activities in real time.
Key Features:
Session monitoring: Monitor all activities a user performs within a session, including file access, downloads, uploads, and sharing.
Activity restrictions: Restrict specific actions within a session, such as preventing downloads or printing when a user is on an unmanaged or non-compliant device.
Session alerts: Configure alerts for risky or suspicious behavior, such as a user attempting to access sensitive data from an unusual location or downloading large volumes of files.
Best Practices for Using Session Controls
1. Start with Monitor-Only Mode:
Always begin with Monitor-only mode before fully enforcing session restrictions. This helps you understand how users interact with apps and identify any potential disruptions.
2. Apply Session Controls to High-Risk Scenarios:
Focus on applying session controls to high-risk situations, such as users accessing apps from unmanaged devices or external networks.
3. Use Conditional Access Logs:
Regularly review logs in Microsoft Defender for Cloud Apps to track user behavior and fine-tune policies based on observed activities.
4. Balance Security and Usability:
While session controls are powerful, it’s important to avoid over-restricting users. Make sure that your policies are aligned with business needs and don’t disrupt productivity.
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