RunAsManager replacement

[jzheaux]

RunAsManager can add to or change the existing authentication for the duration of a message, a request, or a method call.

It overloads the authority string to include instructions to Spring Security as to what authorities to temporarily grant. It is primarily designed to work with the @Secured annotation and with the access XML attribute when not using expressions.

As a first step to supporting this with the authorization manager API, we should:

• Improve AuthorizationFilterParser to support use-expressions="false"
• Improve AuthorizationFilterParser to adapt the Supplier<Authentication> for RUN_AS attributes
• Improve @Secured method handling to adapt the Supplier<Authentication> for RUN_AS attributes

UPDATE: Let's wait on these subtasks. This isn't the way that we want to do impersonation and privilege escalation going forward, and so I don't really want to support a legacy way in a new API. I'll leave this ticket open for investigating what this support should look like going forward.

It's worth considering whether a new contract is needed like Supplier<Authentication> adapt(Supplier<Authentication> authentication, T context) that can be supplied to alter how the adaptation is performed.

[jzheaux]

For now, I'm taking off the 5.8.x milestone, pending the team's upcoming 5.8 planning meeting.

[rwinch]

Sorry I wasn't clear when we met what I was looking for. Let's leave this on 5.8.s as you had very valid reasons for us needing to include it. Specifically we will be deprecating the old RunAsManager behavior without a replacement for users to migrate to before moving to Security 6.0. This fits into our theme of deprecations for 5.x and ensuring we provide a way to opt into their replacements before 6.0x to ease migrations.

[mkjensen]

Any hints to how one should proceed if wanting to implement impersonation and/or privilege escalation with Spring Security 6?

[abccbaandy]

Can you update the doc too?
https://docs.spring.io/spring-security/reference/servlet/authentication/runas.html

It's disappoint others when read doc then found out it's already a deprecated feature.
https://docs.spring.io/spring-security/site/docs/current/api/org/springframework/security/access/intercept/RunAsManager.html

[s-jepsen]

Any progress on this?