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Informations about the package assertion-grant

League OAuth2 Server Assertion Grant

This implements the assertion grants described in RFC 7521. The goal is to be flexible enough to support JWT (RFC 7523) or SAML (RFC 7522) assertions.

https://www.rfc-editor.org/rfc/rfc7521

This was inspired by some needs that PMG's https://www.pmg.com/alli platform had as well as some prior art from from google.

Client Authentication

RFCs 7523 and 7522 are opened ended about this:

If the client_id is present in the request (in the Authorization header of request body), then the normal client validation methods are used. If a client is confidential, client secret would be required.

If client_id is not present, then the the assertion issuer is treated as the oauth client ID.

Scopes

scope may be sent in as a normal request parameter, but RFC 7521 has this to say:

So somehow the assertion is made valid out of band. The assertion backend returns an Assertion implementation which has allowed scopes.

If a caller tries to request scopes outside of the assertion's allowed scopes, an error will be returned.

Assertion Issuers

Assertion issuers are treated as oauth client identifiers.

Assertion Subjects

Assertion subjects are treated as user identifiers in this library. No accomodations for client credentials as that would be better suited for the client_credentials grant with a client_assertion system.

All versions of assertion-grant with dependencies

PHP Build Version
Package Version
Requires php Version ^8.4
league/oauth2-server Version ^9.2
lcobucci/jwt Version ^5.0
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