8.6 KiB
Conditional access Baselne
This conditional access baseline is based on the Microsoft Conditional Access Baseline by Claus Jespersen. This one is slightly minimized and less dificult to understand but still protects almost everything you could wish for. Use this baseline to start off with and expend or modify where needed.
Note
There's no need to create policies, groups or named locations yourself. This can be done automated using Mick-K his Intune Management tool. This is described in Importing the baseline.
Table of Contents
- Conditional access Baselne
- Table of Contents
- Resources
- Version history
- Changelog
- Persona's
- Conditional access policies
- CA000-Global-IdentityProtection-AnyApp-AnyPlatform-MFA
- CA001-Global-AttackSurfaceReduction-AnyApp-AnyPlatform-BLOCK-CountryWhitelist
- CA002-Global-IdentityProtection-AnyApp-AnyPlatform-Block-LegacyAuthentication
- CA003-Global-BaseProtection-RegisterOrJoin-AnyPlatform-MFA
- CA004-Global-IdentityProtection-AnyApp-AnyPlatform-AuthenticationFlows
- CA005-Global-DataProtection-Office365-AnyPlatform-Unmanaged-AppEnforcedRestrictions-BlockDownload
- CA100-Admins-IdentityProtection-AdminPortals-AnyPlatform-MFA
- CA101-Admins-IdentityProtection-AnyApp-AnyPlatform-MFA
- CA102-Admins-IdentityProtection-AllApps-AnyPlatform-SigninFrequency
- CA200-Internals-IdentityProtection-AnyApp-AnyPlatform-MFA
- CA201-Internals-IdentityProtection-AnyApp-AnyPlatform-BLOCK-HighRisk
- CA202-Internals-IdentityProtection-AllApps-WindowsMacOS-SigninFrequency-UnmanagedDevices
- CA203-Internals-AppProtection-MicrosoftIntuneEnrollment-AnyPlatform-MFA
- CA204-Internals-AttackSurfaceReduction-AllApps-AnyPlatform-BlockUnknownPlatforms
- CA205-Internals-IdentityProtection-AllApps-AnyPlatform-CombinedRegistration
- CA206-Internals-BaseProtection-AnyApp-Windows-CompliantorAADHJ
- CA400-GuestUsers-IdentityProtection-AnyApp-AnyPlatform-MFA
- CA401-GuestUsers-AttackSurfaceReduction-AllApps-AnyPlatform-BlockNonGuestAppAccess
- CA402-GuestUsers-IdentityProtection-AllApps-AnyPlatform-SigninFrequency
- Named locations
- Importing the baseline
Resources
➡ Microsoft Learn: https://learn.microsoft.com/en-us/azure/architecture/guide/security/conditional-access-framework
➡ Framework documentation by Claus Jespersen: https://github.com/microsoft/ConditionalAccessforZeroTrustResources/blob/main/ConditionalAccessGovernanceAndPrinciplesforZeroTrust%20October%202023.pdf
➡ Framework resources: https://github.com/microsoft/ConditionalAccessforZeroTrustResources
Version history
| Version nr | Release date |
|---|---|
| 2024.4.1 | Released 10-04-2024 |
| 2024.x.x | Released xx-xx-2024 |
Changelog
Changes are documented here once they are made.
Persona's
Global
Global is a persona/placeholder for policies that are general in nature or do not only apply to one persona. So it is used to define policies that apply to all personas or don't apply to one specific persona. The reason for having this persona is to be able to have a model where we can protect all relevant scenarios. It should be used to hold policies that apply to all users or policies that enforce protection on scenarios not covered by policies for other personas
Admins
We define admins in this context as any non-guest identity (cloud or synced) that have any Azure AD or other Microsoft 365 admin Role (like in MDCA, Exchange, Defender for Endpoints or Compliance). As guests who have such roles are covered in a separate persona, guests are excluded from this persona.
Internals
Internals cover all users who have an AD account synced to Azure AD who are employees of the company and work in a standard end-user role.
Guests
Guests holds all users who have an Azure AD guest account that has been invited into the customer tenant
Conditional access policies
CA000-Global-IdentityProtection-AnyApp-AnyPlatform-MFA
This policy requires MFA for all cloud apps, from every platform. It captures all authentications in scope not captured by other MFA policies.
CA001-Global-AttackSurfaceReduction-AnyApp-AnyPlatform-BLOCK-CountryWhitelist
This policy blocks all countries, to all cloud apps, from every platform except for the countries configured in the named location ALLOWED COUNTRIES. This named location is excluded in this policy.
CA002-Global-IdentityProtection-AnyApp-AnyPlatform-Block-LegacyAuthentication
This policy blocks legacy authentication for all users, to all cloud apps, from any platform.
CA003-Global-BaseProtection-RegisterOrJoin-AnyPlatform-MFA
This policy requires MFA for all users, to register or join a device to your tenant/environment. Make sure to disable Require Multifactor Authentication to register or join devices with Microsoft Entra. This can be found under https://portal.azure.com -> Entra ID -> Devices -> Device settings.
CA004-Global-IdentityProtection-AnyApp-AnyPlatform-AuthenticationFlows
This policy prevents all users from transfering authentication flows from PC to mobile for example. This feature is currently in preview.
CA005-Global-DataProtection-Office365-AnyPlatform-Unmanaged-AppEnforcedRestrictions-BlockDownload
This policy prevents all users from downloading, printing or syncing Office 365 data from an unmanaged device. It requires App Enforce Restrictions.
CA100-Admins-IdentityProtection-AdminPortals-AnyPlatform-MFA
This policy requires MFA for certain admin roles when they access the Admin Portals.
CA101-Admins-IdentityProtection-AnyApp-AnyPlatform-MFA
This policy requires MFA for certain admin roles when they access the any cloud app.
CA102-Admins-IdentityProtection-AllApps-AnyPlatform-SigninFrequency
This policy sets a Sign-in frequency for certain admin roles to a maximum of 12 hours. Admins need to re-authenticate of logon after 12 hours.
CA200-Internals-IdentityProtection-AnyApp-AnyPlatform-MFA
This policy requires MFA for all internal identities, for all cloud applications, from any platform.
Important
Verify the included group(s) and/or add your custom groups which have all internals in it.