Conditional Access Policies
Last Updated: May 2025
Implementation Effort: Medium – IT teams must configure Intune compliance policies and Conditional Access rules in Microsoft Entra, which requires planning and testing but not ongoing manual effort.
User Impact: Medium – Users might be required to register their device, install the Company Portal, or update security settings.
Introduction
Conditional Access is a core enforcement mechanism in Microsoft Entra ID that allows organizations to control access to apps and resources based on real-time conditions. For macOS devices managed by Intune, Conditional Access ensures that only trusted, compliant, and identity-verified endpoints can access corporate data. This section helps administrators evaluate their Conditional Access strategy for macOS and align it with Zero Trust principles.
Why This Matters
- Enforces access control based on device compliance and user identity.
- Supports Zero Trust by requiring continuous evaluation of trust signals.
- Reduces risk by blocking access from unmanaged or non-compliant devices.
- Improves visibility into access patterns and policy effectiveness.
- Enables adaptive access based on risk, location, or session context.
Key Considerations
Device Compliance Integration
- Conditional Access policies can require that macOS devices be marked as compliant in Intune before access is granted.
- This ensures that only devices meeting your FileVault, OS version, and password policies can access sensitive resources.
From a Zero Trust perspective: This enforces explicit verification of device posture before granting access.
App-Based Targeting
- Conditional Access policies can be scoped to specific apps (e.g., Microsoft 365, Salesforce, ServiceNow).
- This allows you to apply stricter controls to high-risk or high-value applications.
From a Zero Trust perspective: This supports least privilege by tailoring access controls to the sensitivity of the resource.
User and Group Scoping
- Policies can be applied to all users or scoped to specific groups, departments, or roles.
- Use this to apply more stringent controls to executives, finance, or privileged IT users.
From a Zero Trust perspective: This enables risk-based access and role-aware enforcement.
Conditions and Controls
Common conditions include:
- Device platform (macOS)
- Location (trusted vs. untrusted networks)
- Sign-in risk (if using Microsoft Defender for Identity)
Common controls include:
- Require compliant device
- Require MFA
- Require app protection policy
From a Zero Trust perspective: These controls enforce adaptive access based on real-time context.
macOS-Specific Considerations
- Ensure that devices are Entra-joined and enrolled in Intune to meet compliance requirements.
- Use Platform SSO and the SSO app extension to ensure seamless authentication and policy enforcement.
- Monitor for devices that are accessing resources but are not enrolled or compliant.
Monitoring and Reporting
- Use the Microsoft Entra admin center to review sign-in logs, policy impact, and blocked access attempts.
- Analyze trends to refine policies and reduce false positives.
From a Zero Trust perspective: Monitoring supports continuous trust evaluation and policy tuning.
Zero Trust Considerations
- Verify explicitly: Access is granted only after confirming user identity, device compliance, and session context.
- Assume breach: Conditional Access policies block access from unmanaged or risky endpoints.
- Least privilege: Access is scoped to the user, device, and app context.
- Continuous trust: Policies are evaluated at every sign-in, not just at enrollment.
- Defense in depth: Conditional Access works alongside compliance policies, SSO, and device restrictions to enforce layered security.
Recommendations
- Require compliant macOS devices for access to all corporate resources.
- Use MFA and device compliance as baseline controls for all users.
- Apply stricter policies to high-risk apps and privileged user groups.
- Use Platform SSO and SSO extensions to ensure seamless policy enforcement.
- Monitor sign-in logs and refine policies based on real-world usage and risk.
- Test policies in report-only mode before enforcing them in production.