[Freeipa-users] Re: MFA for AD users

[Alexander Bokovoy]

On pe, 19 helmi 2021, Mariusz Stysiak via FreeIPA-users wrote:
> Hello List,
>
> I'd really appreciate some insight here.
> I've setup FreeIpa POC (centos7, freeipa 4.7, two freeipa servers as
> multimaster along with some clients). Added OTP's for several users and
> made it work with RADIUS for vpn access authentication purpose. Next,
> I've added AD trust and I am able to log in as AD user. All groovy. Now
> I'd like to enforce MFA for AD users by adding OTP tokens for them. Is
> it possible at all? Since AD user authenticates against AD, shouldn't
> it be AD who provides MFA? 
Authentication of trusted Active Directory users is done by Active
Directory domain controllers, not IdM. Microsoft implementation of
Active Directory does not support 2FA on Kerberos level and as such it
is not possible to use the same technology as described in RFC 6560 with
Active Directory users.

We used to have https://bugzilla.redhat.com/show_bug.cgi?id=1195696 RFE
that tracks *some* sort of a solution to the problem. However, it is not
going to be achieved anytime soon and thus was closed until a work in
upstream communities gets to the point that it could be productised.

Documentation explicitly says OTP are not supported for AD users.
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/...

> FreeIPA behaves strangely when it comes to AD users (mapped via
> external group and POSIX group): AD user 'ipatest' is visible with 'id'
> command (and has it's own UID GID and so on) but cannot be found via
> 'ipa user-find' command even with specific UID provided: 
AD users exist in AD, not in IPA. 


> admin@ipa-poc-1 ~ $ id ipatest(a)lab.trusteddomain.com
> uid=748801177(ipatest(a)lab.trusteddomain.com)
> gid=748801177(ipatest(a)lab.trusteddomain.com)
> groups=748801177(ipatest(a)lab.trusteddomain.com),748800513(domain
> [e-mail]),748801180(linuxusers(a)lab.trusteddomain.com),793600008(ad_users)
>
> admin@ipa-poc-1 ~ $ ipa user-find ipatest
> ---------------
> 0 users matched
> ---------------
> ----------------------------
> Number of entries returned 0
> ----------------------------
> admin@ipa-poc-1 ~ $ ipa user-find ipatest(a)lab.trusteddomain.com
> ---------------
> 0 users matched
> ---------------
> ----------------------------
> Number of entries returned 0
> ----------------------------
> admin@ipa-poc-1 ~ $ ipa user-find ipatest@TRUSTEDOMAIN-LAB
> ---------------
> 0 users matched
> ---------------
> ----------------------------
> Number of entries returned 0
>
>
> admin@ipa-poc-1 ~ $ ipa user-find uid=748801177
> ---------------
> 0 users matched
> ---------------
> ----------------------------
> Number of entries returned 0
> ----------------------------
> I reckon it is due to the one-way trust with AD domain but not sure here. Since "ipa
> otptoken-add' command requires 'owner' parameter (type string and doesn't
> work with UID) I cannot add OTP token for this user.
>
> Another approach I've tried (since ipa otptoken-add command by default uses current
> user as owner) was to log on as AD user and create OTP token 'for myself', but it
> didn't work either:
>
>  [e-mail](a)ipa-poc-1 ~ $ kinit ipatest(a)lab.trusteddomain.com
>     Password for ipatest(a)lab.trusteddomain.com:
>     [e-mail](a)ipa-poc-1 ~ $ ipa otptoken-add --type='TOTP'
>     ipa: ERROR: cannot connect to 'any of the configured servers':
> https://ipa-poc-1.lab/ipa/json, https://ipa-poc-2.lab/ipa/json
> So, to make it short:
>
> Is it possible to add OTP token to external AD user?
> How to do it?
> rgrds
>
> M.
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-- 
/ Alexander Bokovoy
Sr. Principal Software Engineer
Security / Identity Management Engineering
Red Hat Limited, Finland