think finger
Jeremy Katz
katzj at redhat.com
Thu Oct 25 14:06:13 UTC 2007
On Thu, 2007-10-25 at 08:55 -0400, Bryan Clark wrote:
> Pushing off from Ben's email on new user creation [1] I wanted to get
> some setup for the think finger support that david mentioned [2].
I'd actually like to make it a teensy bit more general and think about
the non-Thinkfinger readers also. From my Pile Of Laptops, the
Authentec readers are pretty common. And davidz has already done some
prodding with them based on his blog ;)
While not very relevant to the interaction, it's mostly important so
that we don't make assumptions of hardware capabilities that may or may
not be present.
> Can it's presence be detected automatically? And it's (pam)
> authentication be added automatically?
They're all usb devices, so pretty detectable. Adding the pam config is
just a matter of deciding we're doing it and then adding to the stacks
written out by authconfig
> How many times does it take to train think finger support initially?
This probably depends on the hardware. Thinkfinger is 3 swipes and
trained in hardware. Some of the other readers just give you back an
image and you have to do verification[1] on your own. But probably 3 is
a reasonable guess there too. It's at least the range of "more than
one, less than many"
> Can it be (re)trained incrementally? Is this required?
Nope, you pretty much have to do the initial readings upfront.
> Can we get the image from think finger for user feedback? Ray mentioned
> we might be able to fake it, which would probably be good enough.
This is definitely going to be dependent on the hardware, so probably
can't be counted on.
> Can we detect / remember the number of failed think finger attempts
> before a successful one? This is related to retraining, if it's
> possible to retrain the reader or human to scan better over time.
PAM doesn't usually keep track of a number of failures. You could have a module do it, though if you really wanted I think.
Jeremy
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