Comment by tptacek

If this is interesting to you but you're iffy about setting up another directory service or having AWS be your central list of identities for all your apps, we're open sourcing The Identity Mutilator, a Golang SAML IdP, in a couple weeks. It's self-contained (for now) so doesn't depend on AD or LDAP --- just Postgres --- and runs just fine in a tiny Docker container.