On Jan 26, 2016, at 1:57 PM, Thomas Broyer <t.bro...@gmail.com
<mailto:t.bro...@gmail.com>> wrote:
Fwiw, at Ozwillo, we track grants per user per client_id (we don't
support native apps; only web flows for now), and we don't do
"incremental grants" like Google: if you request scope B and the user
had only granted scope A, you'll get a token for scope B only. This is
partly because our tokens are not for our own APIs only, contrary to
Google, so we want to allow clients to get tokens with narrow scopes
so they could have one token per third-party API and prevent rogue
resources from trying to use received tokens at other APIs.
UI-wise, we tell the user what he already granted to the client, and
even let him grant scopes that the client has pre-registered as
"possibly needed at some time" (through a custom provisioning
protocol), but the issued token is always for the exact scopes that
the client requested in this specific request.
And if all requested scopes have already been granted, then we do a
transparent redirect without showing anything to the user (which is
what most other implementations do too)
Le mar. 26 janv. 2016 19:04, Sergey Beryozkin <sberyoz...@gmail.com
<mailto:sberyoz...@gmail.com>> a écrit :
Hi
I'm not sure if the next question is off topic or too low level,
hopefully not,
When the repeated authorization is skipped or only new scopes are
requested to be authorized as per the incremented auth approach, is it
reasonable to assume that the record that is used to track it all is
actually the existing access token or is totally OIDC implementation
specific ?
I think using the existing token as a record is reasonable because
it is
time scoped and if we do not use the access token for keeping the
track
of the multiple approvals, etc, then one need to introduce one more
record mirroring to some extent the access token...
For example, the user session may have expired but the access
token that
was issued to a client web app on behalf of this user is still active,
so when the user returns and signs in again, and for example, approves
few more scopes, then the existing access token (the record) gets
updated, instead of a new token being created.
If it is reasonable then does it mean the sticky or incremental
authorization works as long as the access token is available
(refreshable) ?
Sergey
On 19/01/16 09:59, Sergey Beryozkin wrote:
> Hi William
>
> Thanks for the advice. FYI we are also on the way to supporting the
> incremental authorization of scopes - thanks for highlighting the
> importance of this process on this list...
>
> Cheers, Sergey
> On 19/01/16 03:10, William Denniss wrote:
>> Agree with Justin, this is pretty common. We support it for
re-auth as
>> well as incremental auth (where the user has already approved
scope "a"
>> and is presented with a request for scopes "a b", they will
only need to
>> approve scope "b"). In fact if you don't do this, then
incremental auth
>> isn't really viable.
>>
>> Regarding security: don't do this for non-confidential clients
where you
>> can't verify the identity of the app by the redirect (e.g. a
localhost
>> redirect to an installed app).
>>
>> On Mon, Jan 18, 2016 at 4:44 AM, Sergey Beryozkin
<sberyoz...@gmail.com <mailto:sberyoz...@gmail.com>
>> <mailto:sberyoz...@gmail.com <mailto:sberyoz...@gmail.com>>> wrote:
>>
>> Hi Justin, thanks for the advice,
>>
>> Cheers, Sergey
>>
>> On 18/01/16 11:47, Justin Richer wrote:
>>
>> Yes, this is common practice. Give the user the option to
>> remember the
>> decision. This is known as "trust on first use", or
tofu. Our
>> server,
>> MITREid Connect, implements this as do many others.
>>
>>
>>
>> -- Justin
>>
>> / Sent from my phone /
>>
>>
>> -------- Original message --------
>> From: Sergey Beryozkin <sberyoz...@gmail.com
<mailto:sberyoz...@gmail.com>
>> <mailto:sberyoz...@gmail.com
<mailto:sberyoz...@gmail.com>>>
>> Date: 1/18/2016 5:59 AM (GMT-05:00)
>> To: oauth@ietf.org <mailto:oauth@ietf.org>
<mailto:oauth@ietf.org <mailto:oauth@ietf.org>>
>> Subject: [OAUTH-WG] Can the repeated authorization of
scopes be
>> avoided ?
>>
>> Hi All
>>
>> The question relates to the process of showing the
authorization
>> code/implicit flow consent screen to a user.
>>
>>
>> I'm discussing with my colleagues the possibility of
avoiding
>> asking the
>> same user whose session has expired and who is
re-authenticating
>> with AS
>> which scopes should be approved.
>>
>> For example, suppose the OAuth2 client redirects a user
with the
>> requested scope 'a'. The user signs in to AS and is shown a
>> consent
>> screen asking to approve the 'a' scope. The user
approves 'a'
>> and the
>> flow continues.
>>
>> Some time later, when the user's session has expired,
the user is
>> redirected to AS with the same 'a' scope.
>>
>> Would it be a good idea, at this point, not to show the
user the
>> consent
>> screen asking to approve the 'a' scope again ? For
example, AS
>> can
>> persist the fact that a given user has already approved
'a' for
>> a given
>> client earlier, so when the user re-authenticates, AS
will use
>> this info
>> and will avoid showing the consent screen.
>>
>> That seems to make sense, but I'm wondering, can there
be some
>> security
>> implications associated with it, any
recommendations/advices
>> will be welcome
>>
>> Sergey
>>
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>
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