Where is [Google Cloud's Identity and Access Management (IAM)](https://docs.cloud.google.com/iam/docs/overview) source code?

Google Cloud Cloud Foundations & Onboarding
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  1. For Identity and Access Management (IAM), Does openldap solve Identity or Access or the both?
  2. How do you implement Identity and Access Management (IAM)?
  3. Have you tried to implement Google Cloud’s Identity and Access Management (IAM)?
  4. Where is Google Cloud’s Identity and Access Management (IAM) source code? I can not find it on github.com.
  5. Do you use openldap to implement Identity and Access Management (IAM)?