[Webkit-unassigned] [Bug 203200] New: [WebAuthn] Support appidExclude enrollment extension
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Oct 21 12:31:46 PDT 2019
https://bugs.webkit.org/show_bug.cgi?id=203200
Bug ID: 203200
Summary: [WebAuthn] Support appidExclude enrollment extension
Product: WebKit
Version: Safari Technology Preview
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: WebCore Misc.
Assignee: webkit-unassigned at lists.webkit.org
Reporter: piperc at google.com
For relying parties that previously enrolled security keys via the U2F enrollment protocol, keys are bound to an application identifier, rather than the relying party id to which WebAuthn enrollments are bound.
Since WebAuthn is meant to be backwards compatible with enrollments via U2F, the authentication extension appid can be provided during authentication [1]. Similarly, to prevent reregistration of the same credential when doing a WebAuthn enrollment, an extension [appidExclude] was added to the WebAuthn specification to first check if a key was enrolled via U2F before completing the WebAuthn enrollment [2][3] and report the key already registered if so.
[1] https://bugs.webkit.org/show_bug.cgi?id=143491
[2] https://github.com/w3c/webauthn/pull/1244
[3] https://w3c.github.io/webauthn/#sctn-appid-exclude-extension
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