The Yubico U2F Validation Server (u2fval) is a server that provides U2F registration and authentication through a simple JSON based REST API.
u2flib-server is installable by one of three means
pip install u2fval
Alternatively, you can run:
pip install u2fval-<version>.tar.gz
.tar.gz file is a source release of the project.
Run these commands to check out the source code:
git clone https://github.com/Yubico/u2fval.git cd u2fval git submodule init git submodule update
Build a source release tar ball by running:
python setup.py sdist
The resulting build will be created in the
You can install directly from the git checkout by running the following commands:
python setup.py install
Configuration is kept in
/etc/yubico/u2fval/u2fval.conf, see the default
configuration file for more information (also available in the conf/ directory
of any source release of this project).
The Yubico U2F Validation Server needs an SQL database to work. Optionally a memcached server can be used to store transient data which doesn’t need to be persisted to the database (if not available this data will be stored in the main database). The default configuration uses an in-memory SQLite3 database which you probably want to change to something like
SQLALCHEMY_DATABASE_URI = 'sqlite:////etc/yubico/u2fval/u2fval.db'
Once the configuration file has been configured with database credentials, the database can be initialized by running the following command:
u2fval db init
To be able to use the server, a client needs to be created. This is done using
u2fval client create command. For example:
u2fval client create example \ https://example.com/app-identity.json \ https://example.com
u2fval client create --help for more information.
Each client request needs to be authenticated. This authentication is outside of the scope of the Yubico U2F Validation Server and can be handled by the webserver or some WSGI middleware. Once authenticated, the client name should be set in the REMOTE_USER server environment variable.
The server can either be run standalone (intended for testing purposes) using
u2fval run command, or be hosted by any WSGI capable web server, such as
Apache with mod_wsgi enabled.
Once the server is set up and at least one client has been created, the client can access the server via the REST API. Find the API documentation in the doc/ directory.