openid / openid/OpenID4VP

Remove `client_id_scheme` = `redirect_uri`

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#269 1 comment 1 reaction 0 assignees View on GitHub

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Description

As per discussion in #263 I believe we should remove this Client ID scheme because there is no way to get authoritative metadata for the client which isn't open to un-detectable manipulation by the requestor impersonating the client. Put another way, with the redirect_uri client ID scheme there is no way to sign the request, have pre-registered metadata about the client nor a trusted way to resolve the clients metadata from a URL, thus meaning any client metadata reported in the client metadata parameter is entirely self-attested metadata about the client set by the requestor.

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Research direction

Read the discussion in #263 first, then locate the client_id_scheme definition and every reference to the redirect_uri scheme in the OpenID4VP specification. Done means the scheme is removed consistently and the specification no longer presents it as supported.

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Assessment

Domain
authentication, security
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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