spring-projects / spring-projects/spring-security

Support RFC 9493 ("sub_id" claim)

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in: oauth2 type: enhancement
Dominant language
Java
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Description

Expected Behavior

RFC 9493 defines the "sub_id" claim for transmitting typed subject identifiers, rather than relying on the flat string of "sub".

Support for this at the Resource and Authorization servers would be very helpful, similar to the SAML ID support.

Current Behavior

Manually parsing and serialising the structures and string constants from/to the Map<String, Object> of claims.

Context

Identifying users that may have multiple identifiers, federating across domains that may have identifier conflicts, etc.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading RFC 9493, then locate how Resource and Authorization servers handle claims in Map<String, Object> and compare that path with the existing SAML ID support. The work is complete when the typed sub_id claim can be supported without manual parsing and serialization of its structures and string constants.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, spring
Domain
authentication, authorization, security
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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