Postgres RDS: is there a way to use LDAP authentication? We have a client interested in using LDAP (specifically Active Directory) for user authentication on a PostgreSQL AWS RDS (Aurora, specifically) database.

Anybody doing this successfully?
As much I am aware this may not be possible. 
Currently, AWS has IAM authentication for postgres which in my humble opinion has a bit further to go before it can be adopted. ie once the IAM user is mapped to the DB Role any once can create a token on behalf on a DB role.