Re: [OAUTH-WG] Recommendations for browser-based apps

[John Bradley <[e-mail]>]

Right,  Refresh token is bearer for native apps, that is why we came up with PKCE to protect code.

For Angular the code flow with PKCE is probably better than the token response type.   

However with bearer tokens it is still riskier than code with a confidential client so the AS should take that into account and not allow refresh tokens to live forever.

One future way to protect refresh tokens and perhaps Access tokens is to use token binding to bind the tokens to the user agent.   You could do that now for refresh tokens in Edge (Chrome has TB off by default still).  

I think more work needs to be done to come up with a best practice for SPA.

John B.

> On Sep 19, 2017, at 7:02 PM, Adam Lewis <[e-mail]> wrote:
> 
> Only for confidential clients.  No authentication is required for public clients.
> 
> On Tue, Sep 19, 2017 at 4:47 PM, Phil Hunt (IDM) <[e-mail] <mailto:[e-mail]>> wrote:
> Except a refresh token is not purely bearer. The client is required to authenticate to use it.
> 
> Phil
> 
> > On Sep 19, 2017, at 2:33 PM, Bill Burke <[e-mail] <mailto:[e-mail]>> wrote:
> >
> > I'd be curious to the response to this too.
> >
> > Seems to me that refresh token has the same possible security risks in
> > an Angular app as an access token, except the refresh token is valid
> > longer....Still, if you did the implicit flow, you'd have to have
> > longer access token timeouts as it would be really annoying for the
> > user to have to login again and again in a long session with your
> > Angular app.
> >
> > We have a javascript adapter that does Authz Code Flow with PKCE for
> > our Angular app.  It also does CORS checks on the code to token XHR
> > request just in case on the IDP side.
> >
> >> On Tue, Sep 19, 2017 at 9:27 AM, Stefan Büringer <[e-mail] <mailto:[e-mail]>> wrote:
> >> Hi,
> >>
> >> there were some discussions in January regarding recommendations for
> >> browser-based apps
> >> (https://www.ietf.org/mail-archive/web/oauth/current/msg16874.html <https://www.ietf.org/mail-archive/web/oauth/current/msg16874.html>).
> >>
> >> I'd just like to ask if the Authorization Code Flow with PKCE is a valid
> >> option for Single-Page-Applications (in our case Angular), because Implicit
> >> Flow cannot be used in our scenario.
> >>
> >> Authorization Code Flow with PKCE eliminates the necessity for client
> >> secrets, but our concern is that exposing the refresh token to the SPA might
> >> be a security risk, compared to the Implicit Flow were no refresh token is
> >> exposed.
> >>
> >> What's your take on this?
> >>
> >> Kind regards,
> >> Stefan Büringer
> >>
> >> P.S. I couldn't find that much on the internet regarding Authorization Code
> >> Flow with PKCE in SPAs, if you have some recommendations for good blog posts
> >> I would be grateful.
> >>
> >> _______________________________________________
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> >>
> >
> >
> >
> > --
> > Bill Burke
> > Red Hat
> >
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