lib/ronin/support/web/websocket/server.rb
# frozen_string_literal: true
#
# ronin-support-web - A web support library for ronin-rb.
#
# Copyright (c) 2023-2024 Hal Brodigan (postmodern.mod3@gmail.com)
#
# ronin-support-web is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# ronin-support-web is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with ronin-support-web. If not, see <https://www.gnu.org/licenses/>.
#
require_relative 'socket'
require_relative 'url_methods'
require 'ronin/support/network/tcp'
require 'ronin/support/network/ssl'
require 'websocket'
module Ronin
module Support
module Web
module WebSocket
#
# Represents a WebSocket server.
#
class Server
include URLMethods
# The underlying server socket.
#
# @return [TCPServer, OpenSSL::SSL::SSLServer]
attr_reader :socket
#
# Initializes the WebSocket server.
#
# @param [String, URI::WS, URI::WSS] url
# The `ws://` or `wss://` URL.
#
# @param [String, nil] bind_host
# The optional host to bind the server socket to.
#
# @param [Integer, nil] bind_port
# The optioanl port to bind the server socket to. If not specified,
# it will default to the port of the URL.
#
# @param [Integer] backlog
# The maximum backlog of pending connections.
#
# @param [Hash{Symbol => Object}] ssl
# Additional keyword arguments for
# `Ronin::Support::Network::SSL.server`.
#
# @option ssl [1, 1.1, 1.2, String, Symbol, nil] :version
# The SSL version to use.
#
# @option ssl [Symbol, Boolean] :verify
# Specifies whether to verify the SSL certificate.
# May be one of the following:
#
# * `:none`
# * `:peer`
# * `:fail_if_no_peer_cert`
# * `:client_once`
#
# @option ssl [Crypto::Key::RSA, OpenSSL::PKey::RSA, nil] :key
# The RSA key to use for the SSL context.
#
# @option ssl [String] :key_file
# The path to the SSL `.key` file.
#
# @option ssl [Crypto::Cert, OpenSSL::X509::Certificate, nil] :cert
# The X509 certificate to use for the SSL context.
#
# @option ssl [String] :cert_file
# The path to the SSL `.crt` file.
#
# @option ssl [String] :ca_bundle
# Path to the CA certificate file or directory.
#
def initialize(url, bind_host: nil,
bind_port: nil,
backlog: 5,
ssl: {})
super(url)
@bind_host = bind_host
@bind_port = bind_port || @port
@socket = case @url.scheme
when 'ws'
Support::Network::TCP.server(
host: @bind_host,
port: @bind_port,
backlog: backlog
)
when 'wss'
Support::Network::SSL.server(
host: @bind_host,
port: @bind_port,
backlog: backlog,
**ssl
)
else
raise(ArgumentError,"unsupported websocket scheme: #{url}")
end
end
#
# Sets the connection backlog for the server socket.
#
# @param [Integer] backlog
# The number of pending connection to allow.
#
def listen(backlog)
@socket.listen(backlog)
end
#
# Accepts a new WebSocket connection.
#
# @return [Client]
# The new WebSocket connection to the server.
#
def accept
Client.new(@url,@socket.accept)
end
#
# Closes the WebSocket server's socket.
#
# @api public
#
def close
@socket.close
end
#
# Determines if the WebSocket server is closed?
#
# @return [Boolean]
#
# @api public
#
def closed?
@socket.closed?
end
#
# Represents a WebSocket client connected to the Websocket server.
#
class Client < Socket
#
# Initializes a WebSocket server client.
#
# @param [URI::WS, URI::WSS] url
# The WebSocket server's `ws://` or `wss://` URL.
#
# @param [TCPSocket, OpenSSL::SSL::SSLSocket] socket
# The client's connection socket.
#
# @api private
#
def initialize(url,socket)
super()
@url = url
@socket = socket
receive_handshake!
set_frame_classes(
::WebSocket::Frame::Incoming::Server,
::WebSocket::Frame::Outgoing::Server
)
end
#
# Receives the WebSocket handshake.
#
# @api private
#
def receive_handshake!(**kwargs)
@handshake = ::WebSocket::Handshake::Server.new(
url: @url.to_s, **kwargs
)
@handshake << @socket.readpartial(1024) until @handshake.finished?
if @handshake.valid?
@socket.write(@handshake)
end
end
end
end
end
end
end
end