Description
Azure Web Apps allows sites to run under both HTTP and HTTPS by default. Web apps can be accessed by anyone using non-secure HTTP links by default. Non-secure HTTP requests can be restricted and all HTTP requests redirected to the secure HTTPS port. It is recommended to enforce HTTPS-only traffic.
Rationaleβ
Enabling HTTPS-only traffic will redirect all non-secure HTTP requests to HTTPS ports. HTTPS uses the TLS/SSL protocol to provide a secure connection which is both encrypted and authenticated. It is therefore important to support HTTPS for the security benefits.
Impactβ
When it is enabled, every incoming HTTP request is redirected to the HTTPS port. This means an extra level of security will be added to the HTTP requests made to the app.
Auditβ
From Azure Portalβ
- Login to Azure Portal using https://portal.azure.com.
- Go to
App Services
. - Click on each App.
- Under
Setting
section, click onConfiguration
. - Under the
General Settings
tab, ensure thatHTTPS Only
is set toOn
underPlatform Settings
.
From Azure CLIβ
To check HTTPS-only traffic value for an existing app, run the following command:
az webapp show --resource-group <RESOURCE_GROUP_NAME> --name <APP_NAME> --query httpsOnly
The output should return true
if HTTPS-only traffic value is set to On
.
From PowerShellβ
List all the web apps configured within the subscription:
Get-AzWebApp | Select-Object ResourceGroup, Name, HttpsOnly
For each web app review the HttpsOnly
setting and make sure it is set to True
.
From Azure Policyβ
If referencing a digital copy of this Benchmark, clicking a Policy ID will open a link to the associated Policy definition in Azure.
- Policy ID: a4af4a39-4135-47fb-b175-47fbdf85311d - Name:
App Service apps should only be accessible over HTTPS
Default Valueβ
By default, HTTPS-only feature will be disabled when a new app is created using the command-line tool or Azure Portal console.
Referencesβ
- https://learn.microsoft.com/en-us/azure/app-service/overview-security?source=recommendations#https-and-certificates
- https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-data-protection#dp-3-encrypt-sensitive-data-in-transit
- https://learn.microsoft.com/en-us/powershell/module/az.websites/set-azwebapp
- https://techcommunity.microsoft.com/t5/azure-paas-blog/enable-https-setting-on-azure-app-service-using-azure-policy/ba-p/3286603