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== 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.

This library aims to support the FIDO U2F and FIDO 2 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 Python 3.7 and later, and is tested on Windows, MacOS,
and Linux. Support for OpenBSD, FreeBSD, and NetBSD 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"
----

There may be a package already available for your distribution that does this
for you, see:
https://support.yubico.com/hc/en-us/articles/360013708900-Using-Your-U2F-YubiKey-with-Linux

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 PC/SC, 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 use https://python-poetry.org/[poetry]. To
set up the dev environment, run this command in the root directory of the
repository:

  poetry install

We also use https://pre-commit.com/[pre-commit] to run some scans on the code
prior to committing.


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

  poetry run pytest