Re: [webauthn] Don't be so strict about uv with the PRF extension. (#1836)

Looks like there are corner cases with `preferred` which will make deploying PRF difficult for a relying party. 

Some corner cases:
- For security keys supporting user verification but PIN has not been setup yet:
  - Same Browser: 
    - Browser not setting up PIN which resulted in `preferred` evaluating to "without UV" at one point. Then user setup user verification out of band on the authenticator some other place. And next time, same evaluation resulting in "With UV" 
  - Different Browser
    - Different browser having different behavior about whether it is setting PIN or not
- Platform Authenticator
  - User moves from one device to another where `preferred` meaning has changed due to device properties in case of platform authenticator in case of syncing credential. 




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Received on Wednesday, 25 January 2023 16:49:31 UTC