What is Webauthn?
Overview of the framework
Webauthn defines an API enabling the creation and use of strong, attested, scoped, public key-based credentials by web applications, for the purpose of strongly authenticating users.
The complete specification can be found on the W3C dedicated page.
This framework contains PHP libraries and Symfony bundle to allow developers to integrate that authentication mechanism into their web applications.
Class, Constant and Property Names
Naming things may be complicated. That’s why the following rule applies on the whole framework: the name of classes, constants and properties are identical to the ones you will find in the specification.
As an example, the section 5.2.2 “Web Authentication Assertion” shows an object named AuthenticatorAssertionResponse that extends AuthenticatorResponse with the following properties:
authenticatorDatasignatureuserHandleYou will find EXACTLY the same structure in the PHP class provided by the library.
Supported features
Attestation Types
Empty
Basic
Self
Private CA
Anonymization CA
Note that Elliptic Curve Direct Anonymous Attestation (ECDAA) is deprecated and not supported
Attestation Formats
FIDO U2F
Packed
TPM
Android Key
Android Safetynet
Apple
Cose Algorithms
RS1, RS256, RS384, RS512
PS256, PS384, PS512
ES256, ES256K, ES384, ES512
ED25519
Extensions
Supported (not fully tested)
appid extension (compatibility with FIDO U2F authenticator
The Token Binding support feature is now deprecated as not part of the latest specification version
Compatible Authenticators
The framework is already compatible with all authenticators.
The compliance of the framework is ensured by running unit and functional tests during its development.
It is also tested using the official FIDO Alliance testing tools. The status of the compliance tests are reported in this issue. At the time of writing (January 2023, all features and algorithms are supported and 100% of the tests pass.
Support
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Contributing
Requests for new features, bug fixed and all other ideas to make this framework useful are welcome.
If you feel comfortable writing code, you could try to fix opened issues where help is wanted or those that are easy to fix.
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