Re: [OAUTH-WG] OAuth 2.0 Token Introspection in RFC7662 : Refresh token?

David Waite <> Mon, 02 March 2020 03:38 UTC

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From: David Waite <>
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Date: Sun, 01 Mar 2020 20:38:45 -0700
Cc: Bill Jung <>,
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To: Andrii Deinega <>
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Subject: Re: [OAUTH-WG] OAuth 2.0 Token Introspection in RFC7662 : Refresh token?
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I would expect the AS to invalidate the refresh token in this case, which would not require a refresh token mode nor necessarily any signaling back to the resource.


> On Mar 1, 2020, at 12:12 AM, Andrii Deinega <> wrote:
> Hello Bill,
> I'm just thinking out loud about possible scenarios for a protected
> resource here... It may decide to revoke a refresh token if a client
> application tried to use it instead of an access token when the
> protected resource is paranoid about security. In order to do that an
> introspection response should include a non-standard parameter which
> indicates that the requested token is refresh_token.
> A user of the introspection endpoint should rely only on a value of
> the active parameter (which is a boolean indicator) of the endpoint
> response. This applies to both types of tokens. Note, the expiration
> date, as well as other parameters, are defined as optional in the
> specification. Both token types can be revoked before the expiration
> date comes even if this parameter is presented as part of the
> response. In my opinion, there are a number of reasons why this check
> (for a refresh token) can be useful on the client application side.
> --
> Regards,
> Andrii
> On Fri, Feb 28, 2020 at 1:59 AM Bill Jung
> <> wrote:
>> Hello, hopefully I am using the right email address.
>> Simply put, can this spec be enhanced to clarify "Who can use the introspection endpoint for a refresh token? A resource provider or a client app or both?"
>> RFC7662 clearly mentions that the user of introspection endpoint is a 'protected resource' and that makes sense for an access token. If we allow this to client apps, it'll give unnecessary token information to them.
>> However, the spec also mentions that refresh tokens can also be used against the endpoint.
>> In case of refresh tokens, user of the endpoint should be a client app because refresh tokens are used by clients to get another access token. (Cannot imagine how/why a resource server would introspect a refresh token)
>> Is it correct to assume that the endpoint should be allowed to client apps if they want to examine refresh token's expiry time? Then the RFC should clearly mention it.
>> Thanks in advance.
>> <Details from the spec>
>> In
>> In '1.  Introduction' section says,
>> "This specification defines a protocol that allows authorized
>> protected resources to query the authorization server to determine
>> the set of metadata for a given token that was presented to them by
>> an OAuth 2.0 client."
>> Above makes clear that user of the endpoint is a "protected resource".
>> And under 'token' in '2.1.  Introspection Request' section says,
>> "For refresh tokens,
>> this is the "refresh_token" value returned from the token endpoint
>> as defined in OAuth 2.0 [RFC6749], Section 5.1."
>> So looks like a refresh token is allowed for this endpoint.
>> Bill Jung
>> Manager, Response Engineering
>> w: +1 604.697.7037
>> Connect with us:
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