[Freeipa-devel] [PATCH] 965 Allow ipa-getkeytab to skip missing enctypes

[Rob Crittenden]

Simo Sorce wrote:
> On Thu, 2012-02-23 at 22:05 -0500, Rob Crittenden wrote:
>> We noticed that older client machines couldn't join FreeIPA 2.1.90
>> servers running KDC 1.90. It was failing to return a ticket for DES so
>> the whole keytab request was failing.
>>
>> I changed it so failures are acceptable as long as one requested type is
>> returned.
>>
>> I wasn't able to get my KDC to actually return a DES key despite
>> enabling weak crypto and adding the des enctypes. Not sure if this is a
>> problem on my end or not. I used RHEL 5 as the client.
>
> The problem is that the authoritative list for the IPA server is in
> cn=REALM.NAME,cn=kerberos,$suffix
>
> In there there are 2 multivalue attributes: krbDefaultEncSaltTypes and
> krbSupportedEncSaltTypes.
>
> You need to add any enctype you want 'supported' in that list.
> You may have to restart DS after you change those values as I don't
> remember if we update internal structures on the fly.

Restarting the KDC did it. I disabled arcfour and now I see two failed 
cert types from RHEL 5:

$ ipa-getkeytab -s doberman.example.com -p test/zeus.example.com -k 
/tmp/test.kt
Failed to retrieve encryption type ArcFour with HMAC/md5 (#23)
Failed to retrieve encryption type DES cbc mode with CRC-32 (#1)
Keytab successfully retrieved and stored in: /tmp/test.kt

>
> On the patch where does the '48' comes from ?

Completely arbitrarily trying to keep error on a single line (similar to 
the list of supported enctypes truncating at 79).

rob