159 lines
6.6 KiB
Markdown
159 lines
6.6 KiB
Markdown
# Jetforce
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An experimental TCP server for the new, under development Gemini Protocol.
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Learn more [here](https://gopher.commons.host/gopher://zaibatsu.circumlunar.space/1/~solderpunk/gemini).
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## Features
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- A built-in static file server with support for gemini directories and
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CGI scripts.
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- Lightweight, single-file framework with zero external dependencies.
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- Modern python codebase with type hinting and black style formatting.
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- Supports concurrent connections using an asynchronous event loop.
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- Extendable components that loosely implement the [WSGI](https://en.wikipedia.org/wiki/Web_Server_Gateway_Interface)
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server/application pattern.
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## Installation
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Requires Python 3.7+
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The latest release can be installed from [PyPI](https://pypi.org/project/Jetforce/):
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```bash
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$ pip install jetforce
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```
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Or, clone the repository and run the script directly:
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```bash
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$ git clone https://github.com/michael-lazar/jetforce
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$ cd jetforce
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$ python3 jetforce.py
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```
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## Usage
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Use the ``--help`` flag to view command-line options:
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```bash
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$ jetforce --help
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usage: jetforce [-h] [-V] [--host HOST] [--port PORT] [--hostname HOSTNAME]
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[--tls-certfile FILE] [--tls-keyfile FILE] [--tls-cafile FILE]
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[--tls-capath DIR] [--dir DIR] [--cgi-dir DIR]
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[--index-file FILE]
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An Experimental Gemini Protocol Server
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optional arguments:
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-h, --help show this help message and exit
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-V, --version show program's version number and exit
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--host HOST Server address to bind to (default: 127.0.0.1)
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--port PORT Server port to bind to (default: 1965)
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--hostname HOSTNAME Server hostname (default: localhost)
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--tls-certfile FILE Server TLS certificate file (default: None)
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--tls-keyfile FILE Server TLS private key file (default: None)
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--tls-cafile FILE A CA file to use for validating clients (default: None)
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--tls-capath DIR A directory containing CA files for validating clients
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(default: None)
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--dir DIR Root directory on the filesystem to serve (default:
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/var/gemini)
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--cgi-dir DIR CGI script directory, relative to the server's root
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directory (default: cgi-bin)
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--index-file FILE If a directory contains a file with this name, that
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file will be served instead of auto-generating an index
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page (default: index.gmi)
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```
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### Setting the ``hostname``
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The server's hostname should be set to the *DNS* name that you expect to
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receive traffic from. For example, if your jetforce server is running on
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"gemini://cats.com", you should set the hostname to "cat.com". Any URLs that
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do not match this hostname will be refused by the server, including URLs that
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use an external IP address such as "gemini://174.138.124.169".
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### TLS Certificates
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The gemini specification *requires* that all connections be sent over TLS.
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If you do not provide a TLS certificate file using the ``--tls-certfile`` flag,
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jetforce will automatically generate a temporary cert for you to use. This is
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great for making development easier, but before you expose your server to the
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public internet you should configure something more permanent. You can generate
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your own self-signed server certificate, or obtain one from a Certificate
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Authority like [Let's Encrypt](https://letsencrypt.org).
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Here's the OpenSSL command that jetforce uses to generate a self-signed cert:
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```
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$ openssl req -newkey rsa:2048 -nodes -keyout {hostname}.key \
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-nodes -x509 -out {hostname}.crt -subj "/CN={hostname}"
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```
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Jetforce also supports verified client TLS certificates. You can specify your
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client CA with the ``--tls-cafile`` or ``--tls-capath`` flags. Verified
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connections will have the ``REMOTE_USER`` variable added to their environment,
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which contains the client certificate's CN attribute. Instructions on how to
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generate TLS client certificates are outside of the scope of this readme, but
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you can find many helpful tutorials
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[online](https://portal.mozz.us/?url=gemini%3A%2F%2Fmozz.us%2Fjournal%2F2019-08-21.txt).
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There are currently no plans to support unverified (transient) client
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certificates. This is due to a technical limitation of the python standard
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library's ``ssl`` module, which is described in detail
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[here](https://portal.mozz.us/?url=gemini%3A%2F%2Fmozz.us%2Fjournal%2F2019-08-21.txt).
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### Static Files
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Jetforce will serve static files in the ``/var/gemini/`` directory:
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- Files ending with **.gmi** will be interpreted as the *text/gemini* type
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- If a directory is requested, jetforce will look for a file in that directory
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with the name of **index.gmi**
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- If it exists, the index file will be returned
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- Otherwise, jetforce will generate a directory listing
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### CGI Scripts
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Jetforce supports a simplified version of CGI scripting. It doesn't
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exactly follow the [RFC 3875](https://tools.ietf.org/html/rfc3875)
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specification for CGI, but it gets the job done for the purposes of Gemini.
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Any executable file placed in the server's ``cgi-bin/`` directory will be
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considered a CGI script. When a CGI script is requested by a gemini client,
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the jetforce server will execute the script and pass along information about
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the request using environment variables:
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| Variable Name | Example |
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| --- | --- |
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| GATEWAY_INTERFACE | GCI/1.1 |
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| GEMINI_URL | gemini://mozz.us/cgi-bin/debug.cgi?foobar
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| HOSTNAME | mozz.us |
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| PATH_INFO | /cgi-bin/debug.cgi |
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| QUERY_STRING | foobar |
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| REMOTE_ADDR | 10.10.0.2 |
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| REMOTE_HOST | 10.10.0.2 |
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| SCRIPT_NAME | /usr/local/www/mozz/gemini/cgi-bin/debug.cgi |
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| SERVER_NAME | mozz.us |
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| SERVER_PORT | 1965 |
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| SERVER_PROTOCOL | GEMINI |
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| SERVER_SOFTWARE | jetforce/0.0.7 |
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The CGI script must then write the gemini response to the *stdout* stream.
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This includes the status code and meta string on the first line, and the
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optional response body on subsequent lines. The bytes generated by the
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CGI script will be forwarded *verbatim* to the gemini client without any
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modificiation.
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## License
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This project is licensed under the [Floodgap Free Software License](https://www.floodgap.com/software/ffsl/license.html).
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> The Floodgap Free Software License (FFSL) has one overriding mandate: that software
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> using it, or derivative works based on software that uses it, must be free. By free
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> we mean simply "free as in beer" -- you may put your work into open or closed source
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> packages as you see fit, whether or not you choose to release your changes or updates
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> publicly, but you must not ask any fee for it.
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