Hi there,
In "IPP Authentication Methods v1.0" on page 19 (https://ftp.pwg.org/pub/pwg/informational/bp-ippauth10-20190816-5199.10.pdf#page=19 <https://ftp.pwg.org/pub/pwg/informational/bp-ippauth10-20190816-5199.10.pdf#page=19>), edge 13 says 'Check for "oauth-authorization-server-uri" and "oauth-authorization-scope" Printer Description attributes'. If the IPP System supported OAuth, then presumably a Client could do a Get-System-Attributes operation to get these same two attributes.
But if the System is allowed to respond with an authentication challenge (similar to Get-User-Printer-Attributes but not similar to Get-Printer-Attributes) then we have a problem because those two OAuth attributes can't be acquired by the Client. I cannot tell from the definition of "Get-System-Attributes" in IPP System v1.0 (http://ftp.pwg.org/pub/pwg/candidates/cs-ippsystem10-20191122-5100.22.pdf#page=70 <http://ftp.pwg.org/pub/pwg/candidates/cs-ippsystem10-20191122-5100.22.pdf#page=70>) whether a System object is allowed to challenge a Client for authentication in response to a Get-System-Attributes operation request.
Piotr, did I capture your "chicken-and-egg" concerns here?
Smith
/**
Smith Kennedy
HP Inc.
*/
> On Oct 7, 2020, at 2:16 PM, Michael Sweet via ipp <ipp at pwg.org> wrote:
>> Piotr,
>> > On Oct 7, 2020, at 4:08 PM, Piotr Pawliczek via ipp <ipp at pwg.org> wrote:
> >
> > Hi,
> >
> > I am trying to figure out how to implement oauth authentication for the IPP System (e.g.: needed to send the Get-Printers request). I cannot find any references to oauth authorization in the document "IPP System Service v1.0 (SYSTEM)". Is there any plan to describe oauth authentication on the level of IPP System?
>> OAuth happens at the HTTP level, so the IPP Authentication Methods v1.0 document applies to all IPP services, not just printing.
>> ________________________
> Michael Sweet
>>>> _______________________________________________
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>ipp at pwg.org>https://www.pwg.org/mailman/listinfo/ipp <https://www.pwg.org/mailman/listinfo/ipp>
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