跳到主要內容

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 (CA) is a core enforcement mechanism in Microsoft Entra ID (formerly Azure AD) 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​

  • CA 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: CA 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: CA 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.

References​