[Freeipa-users] OTP Algorithm

Tue Nov 29 11:57:03 UTC 2016

Hi Alexander,

I can confirm that I am using version 4.2.0.

The bug link provided mentions that it caused GA to fail to scan the codes.
In my situation it is FreeIPA (or related service) which appears to fail to
validate codes generated, meaning that only OTP codes generated using sha1
are validated and accepted.

Just for clarity I can confirm that I have only tested OTP codes generated
and configured via the FreeIPA web interface. I will check the command line
generation and let you know if this makes a difference.

Best Regards,

Callum

On Tue, Nov 29, 2016 at 11:51 AM Alexander Bokovoy <abokovoy at redhat.com>
wrote:

> On ti, 29 marras 2016, Callum Guy wrote:
> >Hi Petr,
> >
> >Thanks for coming back to me on this.
> >
> >I have only tried using Google Authenticator. The generated QR code
> >successfully scans and codes are then generated on the GA device as
> normal.
> >The problem is that the codes simply do not work.
> >
> >My current thinking is that the service which interprets the codes
> >server-side is not configured to use the same algorithm meaning that it is
> >trying to validate sha256/sha512 (both tested and not functional for me)
> >etc codes against codes perhaps generated with sha1 (the only algorithm
> >that appears to work).
> >
> >I apologise in advance for my naive interpretation of the situation, this
> >really isn't an area where i have experience. I'd love to understand whats
> >going on however I can't find what i need in the OTP documentation.
> Which IPA version we are talking about? There was a case when the URI
> generated by 'ipa otptoken-add' was using a wrong case in the algorithm
> value and this was breaking Google Authenticator.
>
> https://fedorahosted.org/freeipa/ticket/5047
>
> This bug was fixed since 4.1.5 release.
>
> >
> >Best Regards,
> >
> >Callum
> >
> >
> >On Tue, Nov 29, 2016 at 11:10 AM Petr Vobornik <pvoborni at redhat.com>
> wrote:
> >
> >> On 11/28/2016 01:03 PM, Callum Guy wrote:
> >> > Hi All,
> >> >
> >> > I wanted to ask a quick question - perhaps a more experienced user
> will
> >> be able
> >> > to help or point me to the correct documentation.
> >> >
> >> > Basically we have implemented password+OTP type authentication which
> >> works great.
> >> >
> >> > When adding a OTP code using the admin login you can choose an
> >> algorithm. For us
> >> > the generated codes only work properly if the weakest sha1 algorithm
> is
> >> chosen/
> >> > To be clear the code generation works fine but the codes are not valid
> >> when
> >> > logging in. Is there a related setting we must change?
> >> >
> >> > Thanks,
> >> >
> >> > Callum
> >> >
> >>
> >> What type of otp token do you use? Does it work with some different?
> >> E.g. FreeOTP vs Google Authenticator ...
> >>
> >>
> >> --
> >> Petr Vobornik
> >>
> >
> >--
> >
> >
> >
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> --
> / Alexander Bokovoy
>

-- 

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