[OpenAFS] Re: Heimdal KDC bug mentioned in rekeying document

[Jeffrey Altman]

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On 7/30/2013 6:57 AM, Harald Barth wrote:
>=20
>> Secure Endpoints has pushed fixes to https://github.com/heimdal/heimda=
l
>> for both the 'master' (aka pre-1.6) and 'heimdal-1-5-branch' branches.=

>=20
> Warning: Real-life results show that the code path for preauth always
> seems to go through the strongest enctype configured (for example
> aes256), even if the users principal does not have a key of that
> enctype. So these users (*) will not be able to obtain tickets any
> more (at least not without password change to get those new keys).

This is an incorrect description.  The explicit problem occurs when the
following combination is true:

 1. user has one or more strong enctype keys with non-default
    password salts

 2. the only keys with default password salts are weak enctypes

 3. preauth is required

In this combination, the strong enctype with the non-default password
salt will not be recommended to the client in the pa-etype-info or
pa-etype-info2 data sent with the preauth required error reply.
Since no pa-etype hint was provided the client chooses its preferred
enctype which is aes256.

A correction has been prepared and will be submitted after testing.

Jeffrey Altman



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