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Jetforce v0.3.0 release

Published 2020-05-31

Jetforce v0.3.0

This release brings some major improvements and necessary refactoring of the jetforce package.

Please read the release notes carefully, and exercise caution when upgrading from previous versions of jetforce.

For users of the static file server

If you are running jetforce only as a static file & CGI server (i.e. you are using the command-line and haven't written any custom python applications), you should not need to make any changes.

There have been some minor updates to the CGI variables, and new CGI variables have been added with additional TLS information. Check out the README for more information on CGI variables.

This package now has third-party python dependencies. If you installed jetforce through pip, you should already be fine. If you were running the jetforce.py script directly from the git repository, you will likely either want to switch to installing from pip (recommended), or setup a virtual environment and run python setup.py install. This will install the dependencies and stick a jetforce executable into your system path.

jetforce-diagnostics

The jetforce-diagnostics script is no longer included as part of jetforce. It has been moved to its own repository at:

https://github.com/michael-lazar/gemini-diagnostics

Code Structure

The underlying TCP server framework has been switched from asyncio+ssl to twisted+PyOpenSSL. This change was necessary to allow support for self-signed client certificates. The new framework provides more access to hook into the OpenSSL library and implement non-standard TLS behavior.

I tried to isolate the framework changes to the GeminiServer layer. This means that if you subclassed from the JetforceApplication, you will likely not need to change anything in your application code. Launching a jetforce server from inside of python code has been simplified (no more setting up the asyncio event loop!).

server = GeminiServer(app)
server.run()

Check out the updated examples in the *examples/* directory for more details.

TLS Client Certificates

Jetforce will now accept self-signed and unvalidated client certificates. The capath and cafile arguments can still be provided, and will attempt to validate the certificate using of the underlying OpenSSL library. The result of this validation will be saved in the TLS_CLIENT_AUTHORISED environment variable so that each application can decide how it wants to accept/reject the connection.

In order to facilitate TOFU verification schemes, a fingerprint of the client certificate is now computed and saved in the TLS_CLIENT_HASH environment variable.

Other Changes

A client certificate can now have an empty commonName field.
( JetforceApplication.route() - named capture groups in regex patterns will now be passed as keyword arguments to the wrapped function. See examples/pagination.py for an example of how to use this feature.
CompositeApplication - A class is now included to support composing multiple applications behind the same jetforce server. See examples/vhost.py for an example of how to use this feature.
CGI variables - SCRIPT_NAME and PATH_INFO have been changed to match their intended usage as defined in RFC 3875.
CGI variables - TLS_CIPHER and TLS_VERSION have been added and contain information about the established TLS connection.
Applications can now optionally return Deferred objects instead of bytes, in order to support applications built on top of asynchronous coroutines.