Description

Enable require_secure_transport on PostgreSQL flexible servers.

Rationale

SSL connectivity provides an additional layer of security by connecting the database server to client applications using Secure Sockets Layer (SSL). Enforcing SSL connections between the database server and client applications helps protect against "man in the middle" attacks by encrypting the data stream between the server and application.

Audit

From Azure Portal

1. Log in to Azure Portal using https://portal.azure.com.
2. Go to Azure Database for PostgreSQL flexible servers.
3. For each database, under Settings, click Server parameters.
4. In the filter bar, type require_secure_transport.
5. Ensure that the VALUE for require_secure_transport is set to ON.

From Azure CLI

Ensure the following command returns a value of on:

az postgres flexible-server parameter show \
    --resource-group {{resource-group-name}} \
    --server-name {{server-name}} \
    --name require_secure_transport

From PowerShell

Ensure the following command returns a value of on:

Get-AzPostgreSqlFlexibleServerConfiguration `
    -ResourceGroupName {{resource-group-name}} `
    -ServerName {{server-name}} `
    -Name require_secure_transport

From Azure Policy

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: c29c38cb-74a7-4505-9a06-e588ab86620a - Name: Enforce SSL connection should be enabled for PostgreSQL flexible servers

Default Value

By default, secure connectivity is enforced, but some application frameworks may not enable it during deployment.

References

1. https://learn.microsoft.com/en-us/azure/postgresql/flexible-server/concepts-networking-ssl-tls
2. https://learn.microsoft.com/en-us/azure/postgresql/flexible-server/how-to-connect-tls-ssl
3. https://learn.microsoft.com/en-us/powershell/module/az.postgresql/get-azpostgresqlflexibleserverconfiguration?view=azps-12.2.0#example-1-get-specified-postgresql-configuration-by-name
4. https://learn.microsoft.com/en-us/powershell/module/az.postgresql/update-azpostgresqlflexibleserverconfiguration?view=azps-12.2.0#example-1-updatae-specified-postgresql-configuration-by-name
5. https://learn.microsoft.com/en-us/security/benchmark/