[fprint] vfs5011 data storage

[Vasily Khoruzhick]

Hi Alex,

On Wed, Jul 6, 2016 at 10:21 AM, Alex Porras <spam at twelve17.com> wrote:
> Hello,
>
> I am trying out fprint on a Lenovo E460 laptop with a fingerprint reader
> that uses the vfs501 driver. Reading through the security notes wiki page,
> it looks like some drivers may or may not write fingerprint data to the hard
> drive:
>
> https://www.freedesktop.org/wiki/Software/fprint/Security_notes/
>
> I have successfully tested scanning one print, yet despite storage of this
> print in fprint-demo, I do not see any files written to /var/lib/fprint.
> However, looking at the source code for the driver makes me think it deals
> with image data:
>
> https://cgit.freedesktop.org/libfprint/libfprint/tree/libfprint/drivers/vfs5011.c#n150
>
> (That being said, I'm not super proficient in C, so maybe I'm misreading
> this.)
>
> Is there perhaps a better way to determine/confirm how this driver handles
> the capture/verification of the fingerprint?

fprintd stores fingerprint data (not to be confused with fingerprint
image) in /var/lib/fprint

fprint_demo stores fingerprint data at ~/.fprint/prints. Note that
fprint_demo uses libfprint directly, not through
fprintd.

Regards,
Vasily