Conditional Access: Sign-in risk-based Conditional Access
Most users have a normal behavior that can be tracked, when they fall outside of this norm it could be risky to allow them to just sign in. You may want to block that user or maybe just ask them to perform multi-factor authentication to prove that they are really who they say they are.
A sign-in risk represents the probability that a given authentication request isn't authorized by the identity owner. Organizations with Azure AD Premium P2 licenses can create Conditional Access policies incorporating Azure AD Identity Protection sign-in risk detections.
There are two locations where this policy may be configured, Conditional Access and Identity Protection. Configuration using a Conditional Access policy is the preferred method providing more context including enhanced diagnostic data, report-only mode integration, Graph API support, and the ability to utilize other Conditional Access attributes in the policy.
The Sign-in risk-based policy protects users from registering MFA in risky sessions. For example. If the users are not registered for MFA, their risky sign-ins will get blocked and presented with the AADSTS53004 error.
Organizations can choose to deploy this policy using the steps outlined below or using the Conditional Access templates (Preview).
Enable with Conditional Access policy
- Sign in to the Azure portal as a global administrator, security administrator, or Conditional Access administrator.
- Browse to Azure Active Directory > Security > Conditional Access.
- Select New policy.
- Give your policy a name. We recommend that organizations create a meaningful standard for the names of their policies.
- Under Assignments, select Users and groups.
- Under Include, select All users.
- Under Exclude, select Users and groups and choose your organization's emergency access or break-glass accounts.
- Select Done.
- Under Cloud apps or actions > Include, select All cloud apps.
- Under Conditions > Sign-in risk, set Configure to Yes. Under Select the sign-in risk level this policy will apply to.
- Select High and Medium.
- Select Done.
- Under Access controls > Grant.
- Select Grant access, Require multi-factor authentication.
- Select Select.
- Confirm your settings and set Enable policy to Report-only.
- Select Create to create to enable your policy.
After confirming your settings using report-only mode, an administrator can move the Enable policy toggle from Report-only to On.
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