supported_enctypes question

[John Harris]

Thanks so much Tom; that makes sense to me.  I would vote for not 
changing it since it's been like, you know, 20 years in the making, but 
if we're gonna change it perhaps:

harris_enctypes ?  :)

Tom Yu wrote:
> John Harris <harris at ucdavis.edu> writes:
> 
>> Greetings,
>>
>> I currently have a MIT KDC where I need to use the des-cbc-crc:normal 
>> encryption type on *one* service principal.  The rest of my KDC all 
>> principals can be aes or rc4.  I'm confused as to what I need in my 
>> config and what will work.
>>
>> If I just have aes256-cts:normal and rc4-hmac:normal listed in kdc.conf 
>> in the supported_enctypes field, I'm still able to create the 
>> des-cbc-crc:normal service principal I need.  In fact, I can kinit -S 
>> for it and obtain it.  My confusion lies in that I thought not having 
>> des-cbc-crc:normal in this configuration line meant the KDC wouldn't 
>> recognize or serve tickets for it.
>>
>> It'd be great to not have to put this in the config line so that later 
>> principals only get the aes256 and rc4 types on them, but I'm not 
>> understanding why I'm successfully obtaining a principal with only the 
>> des encryption type without adding it to this line.
> 
> The "supported_enctypes" configuration variable really means "default
> list of enctype-salttype pairs for which the kadmin subsystem will
> generate keys".  The name is arguably misleading; if anyone has ideas
> about a better name, please suggest one.