[SSSD] [PATCH] Fix krb5 changepw when FAST-only preauth methods are used (like OTP)

Sumit Bose sbose at redhat.com
Mon Mar 10 09:25:56 UTC 2014


On Sun, Mar 09, 2014 at 01:04:38PM +0100, Jakub Hrozek wrote:
> On Fri, Mar 07, 2014 at 12:23:18PM -0500, Nathaniel McCallum wrote:
> > Before this patch, a different set of options was used when calling
> > krb5_get_init_creds_password() for the changepw principal. Because
> > this set of options did not contain the same FAST settings as the
> > options for normal requests, all authentication would fail when the
> > password of a FAST-only account would expire.
> > 
> > The two sets approach was cargo-cult from kinit where multiple
> > requests could be issued using the same options set. However, in the
> > case of krb5_child, only one request (or occasionally a well-defined
> > second request) will be issued. Two option sets are therefore not
> > required.
> > 
> > To fix this problem we removed the second option set used for changepw
> > requests. All requests now use a single option set which is modified,
> > if needed, for well-defined subsequent requests.
> 
> Password changes with both expired and current password work fine with
> the patch. Tested with IPA and MS-AD.
> 
> The code looks good to me, there's no reason for set_changepw_options()
> to return anything, so making it 'void' makes sense.
> 
> I can't think of a reason to keep the two option structures separate.
> The way the kr->options instance is used clobbers the lifetime set with
> krb5_get_init_creds_opt_set_tkt_life but only when changepw principal is
> used.
> 
> ACK from me.

ACK from me as well. I checked the original tickets leading to this
patch and found no reason which would force us to use a second set of
options here.

bye,
Sumit

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