Difference between revisions of "Revocation"
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==Problems== | ==Problems== | ||
| − | *As a general rule any certificate that is issued to any [[Subject]] cannot be [[Revocation | + | *As a general rule any certificate that is issued to any [[Subject]] cannot be guaranteed of [[Revocation]] because it is not possible to know where that certificate has been used. |
*Once a [[Bearer Token]] has been issued to a [[Relying Party]] by a [[Identifier or Attribute Provider]] there is no practical way to issue a [[Revocation]] that will guarantee success. | *Once a [[Bearer Token]] has been issued to a [[Relying Party]] by a [[Identifier or Attribute Provider]] there is no practical way to issue a [[Revocation]] that will guarantee success. | ||
Revision as of 08:07, 3 October 2018
Full Title or Meme
The problem of revoking a grant previously issued by an Identifier or Attribute Provider (IAP) on behalf of a Subject which is a requirement of several privacy regulations.
Context
The collection of User Private Information by a Data Controller now necessitates the ability Authenticate the User under a wide range of challenges, like:
- Simplest of all the User needs to Authenticate from time to time and on a variety of devices under less than ideal conditions where passwords are mistyped and Alternate Authentication factors are lost or fail.
Problems
- As a general rule any certificate that is issued to any Subject cannot be guaranteed of Revocation because it is not possible to know where that certificate has been used.
- Once a Bearer Token has been issued to a Relying Party by a Identifier or Attribute Provider there is no practical way to issue a Revocation that will guarantee success.
Solutions
- The two canonical ways to revoke any grant (or certificate) is to require that the validity be checked online (OCSP) or to distribute a list of revoke certificates(CRL).
- Many mitigations to the Revocation problem exists, for example giving certificates a very short life time.
- Issue a Refresh Token that can be used by the Relying Party to acquire a fresh access token with a short life time on demand. The IAP would then handle any Revocation for the user which would have no effect during that short life time.
- Require the Authorization endpoint to verify liveness of the token before it authorizes actual access to the Resource.
