[OpenAFS-devel] configurable cryptosystem support

[Jeffrey Altman]

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Marcus Watts wrote:
>> Marcus Watts wrote:
>>> I'm in the process of adding "configurable crypto support" to k5ssl,
>>> part of rxk5 for openafs.  I have the configuration logic working with
>>> all the features listed below, I just have to merge it in with other
>>> changes also in the queue (such as windows support, verifykt, etc...)
>> "kvno -k keytab"  and krb5_server_decrypt_ticket_keytab() have been
>> committed to the MIT Kerberos tree for 1.7.
> 
> Good.  I doubt kvno -k does exactly what I have, but still good.

It takes the ticket and decrypts it using
krb5_server_decrypt_ticket_keytab().

> Good to hear about krb5_server_decrypt_ticket_keytab too.

The other functionality you require will be committed shortly.
This will include krb5_get_init_creds_with_keytab, the associated
shortcut function, and an implementation of a MEMORY: keytab.

>>> rc4exp is a degraded version of rc4 has an effective key space of 40 bits,
>>> done by microsoft for export purposes.  I don't know if microsoft still
>>> does this, but I believe neither heimdal nor mit support this anymore.
>>> There's certainly no reason to advertise or use this
>>> with openafs.
>> Please do not implement this.  Microsoft implemented this in the 90s
>> prior to receiving world-wide export permission for RC4-HMAC.  There
>> is no public implementation of this cipher suite.
> 
> There is or was a public implementation in MIT for this.  It's
> certainly in 1.5, and I recall first finding it in some much
> earlier version.  I'm not completely sure that they don't have
> it today.  I agree it's not very desirable.

This was implemented years ago by Sam Hartman when it was believed
that it would be required for interop.  It isn't.  I agree it should be
removed from MIT's Kerberos.

Jeffrey Altman


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