Amazon Aurora PostgreSQL-Compatible edition supports simultaneous authentication with both Microsoft Active Directory (AD) and AWS Identity and Access Management (IAM)

Customers can now enable multiple authentications protocols at the same time for an Amazon Aurora PostgreSQL-Compatible Edition cluster. Amazon Aurora with PostgreSQL compatibility supports both Kerberos authentication with Microsoft Active Directory (AD) and IAM database authentication, but in the past you could choose only one for a given cluster. Now, Amazon Aurora with PostgreSQL compatibility supports enabling Kerberos and IAM authentication for a cluster simultaneously. For example, customers can enable IAM for authenticating AWS Lambda and enable Kerberos for other authentication situations.

Source:: Amazon AWS