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Re: [OAUTH-WG] OAuth Security Topics -- Recommend authorization code instead of implicit

Torsten Lodderstedt <torsten@lodderstedt.net> Sat, 08 December 2018 13:20 UTC

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From: Torsten Lodderstedt <torsten@lodderstedt.net>
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Date: Sat, 08 Dec 2018 14:20:44 +0100
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Cc: Vittorio Bertocci <Vittorio=40auth0.com@dmarc.ietf.org>, Daniel Fett <fett@danielfett.de>, IETF oauth WG <oauth@ietf.org>
To: Nov Matake <matake@gmail.com>
References: <VI1PR0801MB211266BA6F6E06FFB3081425FAD80@VI1PR0801MB2112.eurprd08.prod.outlook.com> <CAD9ie-v3onmKc498cg_-a0AD58ZV=aZANtz=UV+Q0f=9N3nSzQ@mail.gmail.com> <OSBPR01MB2869E83F37046C7FCD4463DDF9D10@OSBPR01MB2869.jpnprd01.prod.outlook.com> <9FF3F589-0423-4CBC-B323-481F771D097C@lodderstedt.net> <OSBPR01MB28690F77DFFB2A85BDB83FBAF9D10@OSBPR01MB2869.jpnprd01.prod.outlook.com> <D6C66E6A-687B-4997-B830-980BE25994C2@lodderstedt.net> <CAANoGhL9aD75AV9QQRdeGE1=4ynjTnULNVr0PXXvt20ipsb4Rw@mail.gmail.com> <FE51CE20-7A49-4A13-A180-6A7C481F3965@lodderstedt.net> <CAGBSGjrzeeR5QQ=nA=gTj0q7sRvRVc0DDacbxB+ED87ymHSOuA@mail.gmail.com> <VI1PR0801MB21120AA6CC9437E237F481A2FAAC0@VI1PR0801MB2112.eurprd08.prod.outlook.com> <EA38C666-2325-430A-91B0-C02AAC65FCC8@lodderstedt.net> <CAO_FVe7j_79sPrRSFXvQJax3vDjT_0=ZaWHW9aan9rJnLUftkA@mail.gmail.com> <CAO7Ng+vsQ2i4=V0nq+ymO6aNCvurb02+Zt7HHwp4=FnWCO4pUQ@mail.gmail.com> <CAANoGhLx42Noqw4WN-THXbGYvS3t1Z2_EmPs+z641-cNovFNvw@mail.gmail.com> <CAANoGh+1wRzz5x7jJrMy-KzCpeK0KN3fK2Qo62KEhz+9SE83=g@mail.gmail.com> <CA+k3eCRjET6gJjX+G7pq-kwFUDgppTK-mrXCAgMtYtW+gVrCbw@mail.gmail.com> <CAD9ie-t=wM6D_zwz0kuPkR19xGfFwfYP=0vjX8uGd4oKsukAOg@mail.gmail.com> <458858450.1398445.1543913404101@mail.yahoo.com> <9DF33F99-E78A-4197-BCEA-AC715761FE87@lodderstedt.net> <942315098.1664424.1543946581453@mail.yahoo.com> <FAFC4820-982B-49B9-9CC5-AFD5CFC4CA3B@lodderstedt.net> <1316266210.2176632.1544020051230@mail.yahoo.com> <468E0532-1B5D-4116-B930-A9B8AB7CDA5A@lodderstedt.net> <CAO_FVe4HrnnQb5-shvgeSAGa+XVKhHtXPsDT_TPezu4Y-CaD=A@mail.gmail.com> <693F457E-3B0F-4612-AE3B-D18462055932@lodderstedt.net> <CAO_FVe7_CsqkTCRSPK5iT5dH5w_NmDuZ-g-2UJgHefUP2i3beQ@mail.gmail.com> <194886B0-D8C8-4489-B66B-7993C7FA0F63@lodderstedt.net> <CAO_FVe7QhqZEcqeSurPU5QxTN3Z1Lp9zY6XpVQxk1VdCGLMUhA@mail.gmail.com> <115824C4-61C1-4986-A30F-382A1AA563BB@gmail.com>
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Subject: Re: [OAUTH-WG] OAuth Security Topics -- Recommend authorization code instead of implicit
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Hi Nov,

> Am 08.12.2018 um 00:20 schrieb Nov Matake <matake@gmail.com>:
> 
> For me,  it seems very hard to issue TB-bound token for JS app and MTLS-bound token for its backend server at same time.

Issuing TB tokens in case of implicit is anyway hard. You need to issue a HTTP redirect to the RS and the RS must respond by HTTP redirecting the user agent to the AS (including the referred TBID). This is a new flow requiring an additional security analysis. Obviously, the RS would see the state value and could modify the request. And the RS endpoint must be protected against open redirection. 

> 
> Do someone has workable recommendation for such case?

Why do you need to issue access tokens to both parties, the frontend and the backend? I would assume a clear layering would either let the SPA or the backend perform the calls towards Resource EP.

kind regards,
Torsten.

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