last sync: 2025-Sep-16 17:23:30 UTC

[Deprecated]: Function apps should have 'Client Certificates (Incoming client certificates)' enabled

Azure BuiltIn Policy definition

Source Azure Portal
Display name [Deprecated]: Function apps should have 'Client Certificates (Incoming client certificates)' enabled
Id eaebaea7-8013-4ceb-9d14-7eb32271373c
Version 3.1.0-deprecated
Details on versioning
Versioning Versions supported for Versioning: 1
3.1.0 (3.1.0-deprecated)
Built-in Versioning [Preview]
Category App Service
Microsoft Learn
Description Client certificates allow for the app to request a certificate for incoming requests. Only clients with valid certificates will be able to reach the app. This policy has been replaced by a new policy with the same name because Http 2.0 doesn't support client certificates.
Cloud environments AzureCloud = true
AzureUSGovernment = unknown
AzureChinaCloud = unknown
Available in AzUSGov Unknown, no evidence if Policy definition is/not available in AzureUSGovernment
Assessment(s) Assessments count: 1
Assessment Id: c2ab4bea-c663-3259-a4cd-03a8feb02825
DisplayName: Function apps should have Client Certificates (Incoming client certificates) enabled
Description: Enabling Client Certificates in function apps is a security measure that ensures only clients with valid certificates can access the app.
This feature requests a certificate for incoming requests, acting as a form of authentication.
If this is not enabled, the app could be exposed to unauthorized access, potentially leading to data breaches or other security incidents.
Therefore, we recommend enabling incoming client certificates for function apps to maintain a secure environment.

Remediation description: To set Client Certificates for your Function App: 1. Navigate to your App Service 2. Select Configuration 3. Go to the General Settings tab 4. Set Incoming Client Certificates to Require For more information, visit here: https://aka.ms/auth-tls
Categories: AppServices
Severity: Medium
preview: True
Mode Indexed
Type BuiltIn
Preview False
Deprecated True
Effect Default
Disabled
Allowed
Audit, Disabled
RBAC role(s) none
Rule aliases IF (1)
Alias Namespace ResourceType Path PathIsDefault DefaultPath Modifiable
Microsoft.Web/sites/clientCertEnabled Microsoft.Web sites properties.clientCertEnabled True False
Rule resource types IF (1)
Compliance Not a Compliance control
Initiatives usage none
History
Date/Time (UTC ymd) (i) Change type Change detail
2023-12-08 20:47:07 change Minor, new suffix: deprecated (3.0.0 > 3.1.0-deprecated)
2022-09-19 17:41:40 change Major (2.0.0 > 3.0.0)
2022-07-01 16:32:34 change Major (1.0.1 > 2.0.0)
2020-12-11 15:42:52 change Patch (1.0.0 > 1.0.1)
2019-11-12 19:11:12 add eaebaea7-8013-4ceb-9d14-7eb32271373c
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api-version=2021-06-01
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