8.8 KiB
python-validity
Validity fingerprint sensor driver.
Setting up
On Ubuntu system:
$ sudo apt remove fprintd
$ sudo add-apt-repository ppa:uunicorn/open-fprintd
$ sudo aptget update
$ sudo apt install open-fprintd fprintd-clients python-validity
...wait a bit...
$ fprintd-enroll
Initialization
Automatic factory reset, pairing and firmware flashing
This repo includes validity-sensors-initializer.py, a simple tool that
helps initializing Validity fingerprint readers under linux, loading their
binary firmware and initializing them.
This tool currently only supports these sensors:
- 138a:0090 Validity Sensors, Inc. VFS7500 Touch Fingerprint Sensor
- 138a:0097 Validity Sensors, Inc.
- 06cb:009a Synaptics, Inc. Which are present in various ThinkPad and HP laptops.
These devices communicate with the laptop via an encrypted protocol and they need to be paired with the host computer in order to work and compute the TLS keys. Such initialization is normally done by the Windows driver, however thanks to the amazing efforts of Viktor Dragomiretskyy (uunicorn), and previously of Nikita Mikhailov, we have reverse-engineerd the pairing process, and so it's possible to do it under Linux with only native tools as well.
The procedure is quite simple:
- Device is factory-reset and its flash repartitioned
- A TLS key is negotiated, generated via host hw ID and serial
- Windows driver is downloaded from Lenovo to extract the device firmware
- The device firmware is uploaded to the device
- The device is calibrated
Once the chip is paired with the computer via this tool, it's possible to use it in libfprint using the driver at
Getting the firmware
It's possible to just extract official Lenovo device driver for vfs0097 or device driver for 009a or driver for vfs0090 (also part of the SCCM package using innoextract (available for all the distros), or wine.
The only reason you need to do this is to find 6_07f_lenovo_mis.xpfwext (for vfs0097) or 6_07f_Lenovo.xpfwext (for vfs0090) and copy it to this project location.
innoextract n1mgf03w.exe -e -I 6_07f_lenovo_mis.xpfwext # vfs0097
innoextract n1cgn08w.exe -e -I 6_07f_Lenovo.xpfwext # vfs0090
innoextract nz3gf07w.exe -e -I 6_07f_lenovo_mis_qm.xpfwext # vfs009a
Note: the above may not be strictly true anymore. It looks like Validity is trying to maintain universal driver which supports all hardware.
Same seems to be true for the .xpfwext files. I.e. the firmware file may not be very platform specific, however the firmware file
must match the version of the Windows driver which contains the command/configuration blobs. Because we extract these blobs
from the actual driver DLL and logs, python-validity relies on a specific version of the firmware file. At the moment I can confirm
that python-validity works on both vfs009a and vfs0097 with a firmware file 6_07f_lenovo_mis_qm.xpfwext
(sha1 edb295cc26a259ec54fef86646d1225f65bb6b80).
Factory reset
If your device was previously paired with another OS or computer, you need to do a factory reset. This will erase all fingers from the internal database and make the device ready for pairing.
$ python3 factory-reset.py
$
Pairing
After performing a factory reset you need to pair your device with a host computer. This must be done only once, before you can enroll/identify/verify fingers. If pairing returns "errorException: Failed: 0315", you need to run factory_reset.py (again) before re-trying.
$ python3 pair.py
Initializing flash...
Detected Flash IC: W25Q80B, 1048576 bytes
Clean slate
Uploading firmware...
Sensor: VSI 55E FM209-001
Loaded FWExt version 1.1 (Sat Feb 3 05:07:30 2018), 8 modules
Calibrating...
Sensor: VSI 55E FM209-001
FWExt version 1.1 (Sat Feb 3 05:07:30 2018), 8 modules
Calibration data loaded from the file.
Init database...
Creating a new user storage object
Creating a host machine GUID record
That's it, pairing's finished
$
Examples
Here is a couple of examples of how you can use this library. All examples assume that your device is already paired.
Initialize a session
Before talking to a device you will need to open it and start a new TLS session
$ python3
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from prototype import *
>>> open9x()
>>>
Enroll a new user
Note: 0xf5 == WINBIO_FINGER_UNSPECIFIED_POS_01 (see ms docs)
>>> db.dump_all()
8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
>>> enroll(sid_from_string('S-1-5-21-394619333-3876782012-1672975908-3333'), 0xf5)
Waiting for a finger...
Progress: 14 % done
Progress: 28 % done
Progress: 42 % done
Progress: 57 % done
Progress: 71 % done
Progress: 85 % done
Progress: 100 % done
All done
11
>>> db.dump_all()
8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
10: User S-1-5-21-394619333-3876782012-1672975908-3333 with 1 fingers:
11: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
>>>
Delete database record (user/finger/whatever)
>>> db.dump_all()
8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
10: User S-1-5-21-394619333-3876782012-1672975908-3333 with 1 fingers:
11: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
>>> db.del_record(11)
>>> db.dump_all()
8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
10: User S-1-5-21-394619333-3876782012-1672975908-3333 with 0 fingers:
>>>
Identify a finger (scan)
>>> identify()
Recognised finger f5 (WINBIO_FINGER_UNSPECIFIED_POS_01) from user S-1-5-21-111111111-1111111111-1111111111-1000
Template hash: 36bc1fe077e59a3090c816fcf2798c30a85d8a8fbe000ead5c6a946c3bacef7b
DBus service
When started, DBus service will first try to initialize the device, then it will try to register itself with the
open-fprintd service. If open-fprintd is not available it will wait for it
to come up.
To start DBus service from the sources (useful for debugging):
PYTHONPATH=. ./dbus_service/dbus-service
Debugging
If you are curious you can enable tracing to see what flows in and out of device before and after encryption
>>> tls.trace_enabled=True
>>> usb.trace_enabled=True
>>> db.dump_all()
>tls> 17: 4b00000b0053746757696e64736f7200
>cmd> 1703030050c00a7ff1cf76e90f168141b4bc519ca9598eacb575ff01b7552a3707be8506b246d5272cb119e7b8b3eccd991cb7d8387245953ff1da62cebfb07fae7e47b9b536fb1a82185cc9399d30625ee3c1451f
<cmd< 1703030050b7a4a39e256bbe5a2589a6fbeec86057bead96f0b79ab6657dd9e851efaccddf9cd0108865aa98c510a1f8cd9b881b3166db553e5b4330c437f09daccbe261b259019774466ddb0d7f97fa67b6337329
<tls< 17: 0000030002000b00000008004c000a004c0053746757696e64736f7200
>tls> 17: 4a080000000000
>cmd> 1703030040ef982e5d6c403ff636c44cd53e7d0f98c21f67ff3b5b80f53555e4547028bd4d17cf5b0539ac0489238f1f066b8ba849120380cf979088d6c63249c873868c95
<cmd< 1703030090f16f4ed027f50103d5cf274a59323e5f25e084e21e4d42d4eab23abc867504ef80a700c775f03c0fafabee2e373fbf551d46e53ca957b86c53853a913e11c8cab98df41afc86af883b4e1b817024b212dbcdf1057a3bcdbc474381c5a5c37162167ff395e8102902c4e0d00b9b4931f0fa986ec3257c6bf2a5b55ea0b5349c035c20ed583522ac7ef9048e97a589a25e
<tls< 17: 00000800010000004c000900f5000300780b030000001c000000010500000000000515000000c76b9f06c7353a42c7353a42e803000000000000000000000000000000000000000000000000000000000000000000000000000000000000
>tls> 17: 4a0a0000000000
>cmd> 1703030040b522c55b73480e0d71a322abf8b65d97c9b55e9930206c463f998886cda4410d1b00ab41ec5b213d2ac18bf3bf61ce817446f27d643f99aba5a1d4cb80d18461
<cmd< 170303009061cef46670a21ca87043f1f4d55153eb46a19757de767d4ddbee736e2a775af63850a89ebe814b7e578979f1fb8a1c2133e0c6fa5b468cff9c731ef3f178b33334bdf64c03903dc2d95e9a16c656f1f8d06fa3431c3971607fec56f104ec7d4e73518705a289fac53fe54ddf33b30dad2b8c1fac67b7decf8c7f86dd843414e7f056a2ea8366611e5094c5491d5ade46
<tls< 17: 00000a00000000004c00030000001c000000010500000000000515000000c5698517bcff12e72496b763050d000000000000000000000000000000000000000000000000000000000000000000000000000000000000
8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
10: User S-1-5-21-394619333-3876782012-1672975908-3333 with 0 fingers:
>>>