[keycloak-dev] advice on back button

[Stian Thorgersen]

The back button should just re-display the current page. Then there should
be separate link/button on the page to go back to the application (as long
as base url is set on client this should always be available, even if
client session has timed out). I think we should also consider having a
button/link to restart the flow.

On 27 January 2016 at 09:55, Stian Thorgersen <sthorger at redhat.com> wrote:

> The action key was introduced in the whole days when we didn't have any
> state on the server that was aware where the flow was. Now that we have a
> clear state on the server that is fully aware of where in a flow a user is
> it shouldn't be required any more, and as long as the flow manager puts it
> in the correct state there's nothing that a user can do to try to jump
> back/forward in the flow.
>
> On 27 January 2016 at 08:11, Marek Posolda <mposolda at redhat.com> wrote:
>
>> +1 to restart the flow entirely when back button is pressed in any stage
>> (either authenticator or required actions screen). Or maybe even drop
>> the ClientSession entirely and redirect back to the application?
>>
>> Once we use this "must-revalidate" header, I hope we can detect that
>> request was triggered by back button. Maybe we will need to maintain all
>> previously used action keys on ClientSessionModel, so we are clearly
>> able to detect that request was triggered by back button?
>>
>> Note that I am not usability expert and I am not sure what is best
>> practice regarding back button and usability. But redirect back to the
>> application looks like most clear way to me.
>>
>> Marek
>>
>> On 26/01/16 23:36, Bill Burke wrote:
>> > The current thinking for browser back button is to set:
>> >
>> > Cache-Control: no-store, must-revalidate, max-age=0
>> >
>> > There are possible security issues with this that I don't know if we
>> > should do this or not.  Don't know if you remember how ClientSessionCode
>> > works, it uses a hash of the client session id and the action key
>> > currently stored in the.  When you switch from authentication to
>> > required actions, the action key changes.  Now, if you hit the back
>> > button on a required action page, it would take you back to an
>> > authentication screen.  The code check would fail because the action
>> > keys don't match.
>> >
>> > Do we actually need this action key stuff?  Can we just let the flow
>> > manager put the browser in the correct state?  So if an "authenticate"
>> > url is hit and the flow is on required actions, just redirect to the
>> > required actions URL.   I just worry that this is some sort of security
>> > hole somehow.  Maybe we're better off just reseting and restarting the
>> > flow entirely.
>> >
>>
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>
>
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