== python-fido2
image:https://github.com/Yubico/python-fido2/workflows/build/badge.svg["Github actions build", link="https://github.com/Yubico/python-fido2/actions"]


Provides library functionality for communicating with a FIDO device over USB as
well as verifying attestation and assertion signatures.

WARNING: This project is in beta. Expect things to change or break at any time!

WARNING: Version 0.9 is the last planned version of this library which will
support Python 2. The next major version planned is 1.0, which will require
Python 3 or later.

WARNING: The latest version of cryptography.io is currently 35, which has an
issue with verifying TPM attestation. If you require this functionality, use
cryptography 3.4.8 (or earlier) until 36 is released, which is expected to
resolve this issue.

This library aims to support the FIDO U2F and FIDO 2.0 protocols for
communicating with a USB authenticator via the Client-to-Authenticator Protocol
(CTAP 1 and 2). In addition to this low-level device access, classes defined in
the `fido2.client` and `fido2.server` modules implement higher level operations
which are useful when interfacing with an Authenticator, or when implementing
WebAuthn support for a Relying Party.

For usage, see the `examples/` directory.


=== References
These links related to WebAuthn and FIDO2 can help you get started:

* Yubico WebAuthn/FIDO2 guide: https://developers.yubico.com/FIDO2/
* W3C WebAuthn specification: https://www.w3.org/TR/webauthn/
* FIDO specifications: https://fidoalliance.org/specifications/download/


=== License
This project, with the exception of the files mentioned below, is licensed
under the BSD 2-clause license.
See the _COPYING_ file for the full license text.

This project contains source code from pyu2f (https://github.com/google/pyu2f)
which is licensed under the Apache License, version 2.0.
These files are located in `fido2/hid/`.
See http://www.apache.org/licenses/LICENSE-2.0,
or the _COPYING.APLv2_ file for the full license text.

This project also bundles the public suffix list (https://publicsuffix.org)
which is licensed under the Mozilla Public License, version 2.0.
This file is stored as `fido2/public_suffix_list.dat`.
See https://mozilla.org/MPL/2.0/,
or the _COPYING.MPLv2_ file for the full license text.


=== Requirements
fido2 is compatible with CPython 2.7 (2.7.6 and up), 3.5 onwards, and is tested
on Windows, MacOS, and Linux. Support for OpenBSD and FreeBSD is provided as-is
and relies on community contributions.


=== Installation
fido2 is installable by running the following command:

  pip install fido2

To install the dependencies required for communication with NFC Authenticators,
instead use:

  pip install fido2[pcsc]

Under Windows 10 (1903 or later) access to FIDO devices is restricted and
requires running as Administrator. This library can still be used when running
as non-administrator, via the  `fido.client.WindowsClient` class. An example of
this is included in the file `examples/credential.py`.

Under Linux you will need to add a Udev rule to be able to access the FIDO
device, or run as root. For example, the Udev rule may contain the following:

----
#Udev rule for allowing HID access to Yubico devices for FIDO support.

KERNEL=="hidraw*", SUBSYSTEM=="hidraw", \
  MODE="0664", GROUP="plugdev", ATTRS{idVendor}=="1050"
----

Under FreeBSD you will either need to run as root or add rules for your device
to /etc/devd.conf, which can be automated by installing security/u2f-devd:

  # pkg install u2f-devd


=== Dependencies
This project depends on Cryptography. For instructions on installing this
dependency, see https://cryptography.io/en/latest/installation/.

NFC support is optionally available via PCSC, using the pyscard library. For
instructions on installing this dependency, see
https://github.com/LudovicRousseau/pyscard/blob/master/INSTALL.md.


=== Development
For development of the library, we recommend using `pipenv`. To set up the dev
environment, run this command in the root directory of the repository:

  pipenv install --dev


==== Running tests
While many tests can run on their own, some require a connected U2F or FIDO2
device to run.

  pipenv run test

