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

> On 24 Nov 2022, at 20:48, Julian Kippels <kippels@hhu.de> wrote:
>
> What exactly are the requirements for the hash upgrade to trigger? I have set up a test server, nsslapd-enable-upgrade-hash is set to "on" but I cannot get the hashes to convert from SSHA to PBKDF2_SHA256.
>
> I do a bind with directory manager and search for testuser, which gives me the SSHA-Hash. Ihen I bind as testuser and perform a search. Then I bind as directory manager again and search for testuser again. The hash still remains as SSHA.

If the user performs a successful bind, and the material used has a different hash algorithm than the configured default, it will be re-hashed and saved.

If the hash is the same, no action is taken.



>
> Julian
>
> Am 22.11.22 um 15:30 schrieb Thierry Bordaz:
>> 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.
>> 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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>
> --
> ---------------------------------------------------------
> | | Julian Kippels
> | | M.Sc. Informatik
> | |
> | | Zentrum für Informations- und Medientechnologie
> | | Heinrich-Heine-Universität Düsseldorf
> | | Universitätsstr. 1
> | | Raum 25.41.O1.32
> | | 40225 Düsseldorf / Germany
> | |
> | | Tel: +49-211-81-14920
> | | mail: kippels@hhu.de
> ---------------------------------------------------------
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--
Sincerely,

William Brown

Senior Software Engineer,
Identity and Access Management
SUSE Labs, Australia

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