[389-users] Re: Wrong password hash algorithm returned

On 11/22/22 9:30 AM, Thierry Bordaz wrote:
>
> On 11/22/22 10:28, Julian Kippels wrote:
>> Hi Thierry,
>>
>> that's a nasty catch…
>>
>> On the one hand I think this is a nice feature to improve security,
>> but on the other hand PBKDF2_SHA256 is the one algorithm that
>> freeradius cannot cope with.
>>
>> I suppose there is no way to revert all changed hashes after I set
>> "nsslapd-enable-upgrade-hash" to "off"? Other than to reinitialize
>> all affected suffixes from the export of the old servers?
>
>
> Indeed this is a bad side effect of the default value :(
>
> If you need to urgently fix those new {PBKDF2_SHA256}, then reinit is
> the way to go. Else you could change the default password storage to
> SSHA and keep nsslapd-enable-upgrade-hash=on. So that it will revert,
> on bind, to the SSHA hash.

This reminds me of an enhancement I thought proposed awhile ago, where
the upgrade hash plugin can be configured to use a specific algorithm
(upgrade or downgrade).  Might be worth considering it now...

Mark

>
> thierry
>
>>
>> Julian
>>
>> Am 22.11.22 um 09:56 schrieb Thierry Bordaz:
>>> Hi Julian,
>>>
>>> This is likely the impact of
>>> https://github.com/389ds/389-ds-base/issues/2480 that was introduced
>>> in 1.4.x.
>>>
>>> On 1.4.4 default hash is PBKDF2, this ticket upgrade hash of user
>>> entries during the user bind (enabled with
>>> nsslapd-enable-upgrade-hash).
>>>
>>> best regards
>>> thierry
>>>
>>> On 11/22/22 09:25, Julian Kippels wrote:
>>>> Hi,
>>>>
>>>> We have a radius server that reads the userPassword-attribute from
>>>> ldap to authenticate users. There is a strange phenomenon where
>>>> sometimes the answer from the ldap-server gives the wrong password
>>>> hash algorithm. Our global password policy storage scheme is set to
>>>> SSHA. When I perform a ldapsearch as directory manager I see that
>>>> the password hash for a given user is
>>>> {SSHA}inserthashedpasswordhere. But when I run tcpdump to see what
>>>> our radius is being served I see {PBKDF2_SHA256}someotherhash
>>>> around 50% of the time. Sometime another request from radius a few
>>>> seconds after the first one gives the correct {SSHA} response.
>>>>
>>>> This happened right after we updated from 389ds 1.2.2 to 1.4.4.
>>>> I am a bit stumped.
>>>>
>>>> Thanks in advance,
>>>> Julian
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