RFR: 8344420: Remove Security Manager dependencies from javax.security package

[Alan Bateman]

On Mon, 25 Nov 2024 17:40:12 GMT, Sean Mullan <mullan at openjdk.org> wrote:

> Now that JEP 486 has been integrated, the `javax.security` package implementation dependencies on `System.getSecurityManager`, `AccessController.doPrivileged` and `AccessControlContext` can be removed.
> 
> Most of the changes are straightforward: removal of code calling `System.getSecurityManager()` and unwrapping of code inside `AccessController.doPrivileged`. However, two changes involved slightly more complicated work:
> 
> 1. `javax.security.auth.login.Configuration` and `javax.security.auth.login.LoginContext` do not need to capture the caller's access control context anymore.
> 2. The `SecureSet` implementation in `javax.security.auth.Subject` is greatly simplified because it does not do security checks anymore.

I went through the changes and it looks a good cleanup. I think it would good to have a second reviewer, esp. for Subject and LoginContext, as there is a lot in this cleanup.

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Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/22368#pullrequestreview-2459281282