[Freeipa-users] OTP Algorithm
Callum Guy
callum.guy at x-on.co.uk
Wed Nov 30 14:30:55 UTC 2016
Hi David,
I can confirm that using FreeOTP resolves the problem for me.
What a frustration, I am surprised that Google wouldn't add support beyond
SHA1 - perhaps a notice on the OTP documentation page would help others in
this situation.
Thank you so much for your assistance and links to explain the situation. I
hope to pay back the favour in due course.
Best Regards,
Callum
On Wed, Nov 30, 2016 at 1:11 PM David Kupka <dkupka at redhat.com> wrote:
> On 30/11/16 10:13, David Kupka wrote:
> > On 29/11/16 12:57, Callum Guy wrote:
> >> 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
> >
> > Hello Callum,
> > I've tried it with FreeIPA 4.3.2 (stock Fedora 24) and FreeOTP. I've
> > generated 3 OTPs (with sha256, sha384 and sha512) for tuser in the WebUI
> > and was then able to login into WebUI without problems.
> >
> >
> > $ ipa otptoken-find --owner tuser --all
> > --------------------
> > 3 OTP tokens matched
> > --------------------
> > dn:
> >
> ipatokenuniqueid=3c899764-7abf-459d-bf2b-7ba4af978a8b,cn=otp,dc=dom-058-216,dc=example,dc=com
> >
> > Unique ID: 3c899764-7abf-459d-bf2b-7ba4af978a8b
> > Type: TOTP
> > Owner: tuser
> > Key: U5XDN0BYc9KbvG1iYuVPuVHB448=
> > Algorithm: sha256
> > Digits: 6
> > Clock offset: 0
> > Clock interval: 30
> > ipatokentotpwatermark: 49349880
> > objectclass: top, ipatokentotp, ipatoken
> >
> > dn:
> >
> ipatokenuniqueid=40ad189b-7b7c-44b9-8450-b3eb78057ef6,cn=otp,dc=dom-058-216,dc=example,dc=com
> >
> > Unique ID: 40ad189b-7b7c-44b9-8450-b3eb78057ef6
> > Type: TOTP
> > Owner: tuser
> > Key: C79y2W+I0z429eRzsRP7qdpROaI=
> > Algorithm: sha512
> > Digits: 6
> > Clock offset: 0
> > Clock interval: 30
> > ipatokentotpwatermark: 49349882
> > objectclass: top, ipatokentotp, ipatoken
> >
> > dn:
> >
> ipatokenuniqueid=baf6d329-61ad-46f1-beca-6ddb55ba9bb4,cn=otp,dc=dom-058-216,dc=example,dc=com
> >
> > Unique ID: baf6d329-61ad-46f1-beca-6ddb55ba9bb4
> > Type: TOTP
> > Owner: tuser
> > Key: 2hxrsJjQ6e+3qzVPZremtsB/NCg=
> > Algorithm: sha384
> > Digits: 6
> > Clock offset: 0
> > Clock interval: 30
> > ipatokentotpwatermark: 49349881
> > objectclass: top, ipatokentotp, ipatoken
>
> I've tried with Google Authenicator too and was unable to login.
>
> Alexander found issue [1] asking for SHA256 support. From comment on the
> issue it appear that SHA1 is the only supported hash.
>
> I compared codes generated by oathtool [2] and find out that Google
> Authenticator just ignores the information about used hash function and
> uses SHA1 without any error or warning.
>
> So I can only recommend switching to FreeOTP or returning to SHA-1 hash
> function.
>
> [1] https://github.com/google/google-authenticator-libpam/issues/11
> [2] http://www.nongnu.org/oath-toolkit/oathtool.1.html
>
> >
> >
> >>
> >>
> >> 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
> >>>
> >>
> >>
> >>
> >
> >
>
>
> --
> David Kupka
>
--
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