[OAUTH-WG] is updated guidance needed for JS/SPA apps?

"Brock Allen" <brockallen@gmail.com> Thu, 17 May 2018 12:57 UTC

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Date: Thu, 17 May 2018 08:56:52 -0400
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From: "Brock Allen" <brockallen@gmail.com>
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Subject: [OAUTH-WG] is updated guidance needed for JS/SPA apps?
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Much like updated guidance was provided with the "OAuth2 for native apps" RFC, should there be one for "browser-based client-side JS apps"? I ask because google is actively discouraging the use of implicit flow:

https://github.com/openid/AppAuth-JS/issues/59#issuecomment-389639290

>From what I can tell, the complaints with implicit are:
* access token in URL
* access token in browser history
* iframe complexity when using prompt=none to "refresh" access tokens

But this requires:
* AS/OP to support PKCE
* AS/OP to support CORS 
* user-agent must support CORS
* AS/OP to maintain short-lived refresh tokens 
* AS/OP must aggressively revoke refresh tokens at user signout (which is not something OAuth2 "knows" about)
* if the above point can't work, then client must proactively use revocation endpoint if/when user triggers logout

Any use in discussing this?

-Brock