Re: [OAUTH-WG] problem statement
Michael Thomas <mike@mtcc.com> Tue, 06 September 2011 19:01 UTC
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Date: Tue, 06 Sep 2011 12:03:15 -0700
From: Michael Thomas <mike@mtcc.com>
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To: Eran Hammer-Lahav <eran@hueniverse.com>
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Cc: "oauth@ietf.org" <oauth@ietf.org>
Subject: Re: [OAUTH-WG] problem statement
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Eran Hammer-Lahav wrote: > Framing this as an OAuth issue is wrong. In your scenario: > > 1. Install bad app > 2. Do protocol X > 3. Bad things happen No. It's 1. Install app. Users don't know which are which. Have you ever used oauth through a phone app? How did you determine it wasn't evil? The yahoo guy here apparently has lots of money if you can tell him too. Mike > > X can be anything. For example, the app can add a root cert to your os and break TLS protection. > > EHL > > On Sep 6, 2011, at 11:50, "Michael Thomas" <mike@mtcc.com> wrote: > >> William Mills wrote: >>> OAuth doesn't solve this problem, and can't. Generally the question is >>> whether the app appears to come from a reputable source, and nowadays >>> whether it's signed (in windows land) or otherwize certified by the >>> provider. >>> >>> If you manage to solve this problem in a real way I'd be interested in >>> investing in your company. >> Then what I don't see anywhere is that oauth is not applicable to embedded >> web objects, and that end users should *never* trust oauth in a, say, phone >> app. As far as I can tell, the server deploying oauth can't tell that it's >> being misused, so this is all on the shoulders of the end user. >> >> It sure looks like oauth is easily subverted in the real world. >> >> Mike >> >>> ------------------------------------------------------------------------ >>> *From:* Michael Thomas <mike@mtcc.com> >>> *To:* Eran Hammer-Lahav <eran@hueniverse.com> >>> *Cc:* "oauth@ietf.org" <oauth@ietf.org> >>> *Sent:* Tuesday, September 6, 2011 11:34 AM >>> *Subject:* Re: [OAUTH-WG] problem statement >>> >>> Eran Hammer-Lahav wrote: >>>> Don't install crap on you device or computer. OAuth is the least of >>> your concern if you install bad software. >>>> If there was a solution to this we would not need an antivirus. >>> How exactly does an end user know what is "crap" or not? Or are you just >>> dismissive of apps in >>> general? I don't think that apple and google are going to close up shop >>> because it breaks oauth's >>> trust model. >>> >>> Mike >>> >>>> EHL >>>> On Sep 6, 2011, at 11:23, "Michael Thomas" <mike@mtcc.com >>> <mailto:mike@mtcc.com>> wrote: >>>>> Eran Hammer-Lahav wrote: >>>>>> I agree. If you are going to install a native app, you better trust >>> it not to do bad things. Grabbing your password is the least interesting >>> thing such an app can abuse. I don't see any need to change the v2 draft. >>>>> How, exactly, is the user supposed to protect themselves against >>> rogue apps? >>>>> It sounds like the solution is to tell them to never use oauth in an >>> app at all. >>>>> Is oauth only intended to be used on standalone trustable web >>> browsers? I don't recall >>>>> seeing that anywhere. >>>>> >>>>> Mike >>>>> >>>>>> EHL >>>>>> >>>>>> On Sep 6, 2011, at 11:10, "Igor Faynberg" >>> <igor.faynberg@alcatel-lucent.com >>> <mailto:igor.faynberg@alcatel-lucent.com>> wrote: >>>>>>> Mike, >>>>>>> >>>>>>> You've got the problem statement right: allowing the user to >>> authorize resource access to another party without divulging user's >>> credentials is the objective of OAuth. You are also right in that the >>> attack you have described defies the whole purpose of OAuth. I do not >>> think though that it is related to OAuth per se. >>>>>>> To this end, the security work led by Torsten has thoroughly >>> analyzed the protocol and specified protection against multiple protocol >>> attacks. From what you described, it appears to me that the attack you >>> mention is not related to the protocol but rather to the user's >>> environment. There is no possible protection from key loggers that a >>> protocol can implement. I could be mistaken; in any case, it looks like >>> the problem rests with the implementation of WebView. >>>>>>> If I am wrong, I would appreciate a detailed description of what >>> happened. >>>>>>> Igor >>>>>>> >>>>>>> On 9/6/2011 1:40 PM, Michael Thomas wrote: >>>>>>>> Hi all, >>>>>>>> >>>>>>>> Barry suggested that I might subscribe and explain what I sent him. >>>>>>>> >>>>>>>> My basic problem is that in neither the protocol nor the threats >>> drafts, >>>>>>>> I can't seem to find what problem is actually trying to be solved >>> with >>>>>>>> oauth, and what assumptions you're making about various elements. >>>>>>>> >>>>>>>> Here's what I did. I've written an app, and I wanted re-integrate the >>>>>>>> ability to send tweets after they deprecated Basic. So the app has a >>>>>>>> webView (android, iphone...) which it obviously completely controls. >>>>>>>> With oauth, the webview UA will ultimately redirect off to Twitter's >>>>>>>> site to collect the user's credentials and grant my app's backend an >>>>>>>> access token (sorry if I get terminology screwed up, i'm just coming >>>>>>>> up to speed). >>>>>>>> >>>>>>>> What occurs to me is that webview affords exactly zero protection >>> from >>>>>>>> my client (ie, the app) from getting the user's twitter >>> credentials. All >>>>>>>> I have to do is set up a keypress handler on that webview and in >>> a few >>>>>>>> minutes of hacking I have a key logger. etc. >>>>>>>> >>>>>>>> So what I can't tell is whether this is a "problem" or not, because I >>>>>>>> don't know what problem you're trying to solve. If the object of >>> oauth >>>>>>>> isn't to keep user/server credentials out of the hands of a third >>> party, >>>>>>>> then what is it trying to solve? Is there an expectation that the >>>>>>>> UA is trusted by the user/server? What happens when that's not >>> the case? >>>>>>>> Regardless of whether I'm misunderstanding, it would sure be nice >>> to have >>>>>>>> both the problem and your assumptions laid out, hopefully with >>> some prominence >>>>>>>> so you don't get these sort of dumb questions. >>>>>>>> >>>>>>>> Mike >>>>>>>> _______________________________________________ >>>>>>>> OAuth mailing list >>>>>>>> OAuth@ietf.org <mailto:OAuth@ietf.org> >>>>>>>> https://www.ietf.org/mailman/listinfo/oauth >>>>>>> _______________________________________________ >>>>>>> OAuth mailing list >>>>>>> OAuth@ietf.org <mailto:OAuth@ietf.org> >>>>>>> https://www.ietf.org/mailman/listinfo/oauth >>>>>> _______________________________________________ >>>>>> OAuth mailing list >>>>>> OAuth@ietf.org <mailto:OAuth@ietf.org> >>>>>> https://www.ietf.org/mailman/listinfo/oauth >>> _______________________________________________ >>> OAuth mailing list >>> OAuth@ietf.org <mailto:OAuth@ietf.org> >>> https://www.ietf.org/mailman/listinfo/oauth >>> >>>
- Re: [OAUTH-WG] problem statement Paul Madsen
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement John Kemp
- Re: [OAUTH-WG] problem statement Michael Thomas
- [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Igor Faynberg
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement William Mills
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement William Mills
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Justin Richer
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Jill Burrows
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Aiden Bell
- Re: [OAUTH-WG] problem statement Melinda Shore
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Aiden Bell
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Justin Richer
- Re: [OAUTH-WG] problem statement Igor Faynberg
- Re: [OAUTH-WG] problem statement Igor Faynberg
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Igor Faynberg
- Re: [OAUTH-WG] problem statement John Kemp
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement John Kemp
- Re: [OAUTH-WG] problem statement William Mills
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement John Kemp
- Re: [OAUTH-WG] problem statement Melinda Shore
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Aiden Bell
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Melinda Shore
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Peter Saint-Andre
- Re: [OAUTH-WG] problem statement Melinda Shore
- Re: [OAUTH-WG] problem statement Peter Saint-Andre
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Peter Saint-Andre
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement William Mills
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Manger, James H
- Re: [OAUTH-WG] problem statement Justin Richer
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Igor Faynberg
- Re: [OAUTH-WG] problem statement John Kemp
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Igor Faynberg
- Re: [OAUTH-WG] problem statement David Waite
- Re: [OAUTH-WG] problem statement Phil Hunt
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Melinda Shore
- Re: [OAUTH-WG] problem statement Peter Saint-Andre
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Aiden Bell
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Aiden Bell
- Re: [OAUTH-WG] problem statement Peter Saint-Andre
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Eran Hammer-Lahav
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement Melinda Shore
- Re: [OAUTH-WG] problem statement Ben Niven-Jenkins
- Re: [OAUTH-WG] problem statement Michael Thomas
- Re: [OAUTH-WG] problem statement David Recordon
- Re: [OAUTH-WG] problem statement Thomas Hardjono
- Re: [OAUTH-WG] problem statement Phil Hunt