Class: Straycall::Recorder

Inherits:
Object
  • Object
show all
Defined in:
lib/straycall/recorder.rb

Instance Method Summary collapse

Constructor Details

#initialize(path = ".straycall.recorded.yml", force: false) ⇒ Recorder

Returns a new instance of Recorder.



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# File 'lib/straycall/recorder.rb', line 8

def initialize(path = ".straycall.recorded.yml", force: false)
  @path = path
  @force = force
end

Instance Method Details

#write(violations) ⇒ Object 



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# File 'lib/straycall/recorder.rb', line 13

def write(violations)
  network = violations.filter_map do |item|
    next unless item.target[:type] == "inet" && item.target[:host] != "?"

    {"host" => item.target[:host]}.tap do |rule|
      rule["ports"] = [item.target[:port]] if (1..65_535).cover?(item.target[:port])
    end
  end.uniq
  unix = violations.filter_map { |item| item.target[:path] if item.target[:type] == "unix" && item.target[:path] != "?" }.uniq
  domains = violations.filter_map { |item| item.target[:domain] if item.target[:type] == "socket" && item.target[:domain] }.uniq
  unbound_listen = violations.any? { |item| item.target[:type] == "socket" && item.target[:operation] == "listen" }
  writes = violations.filter_map do |item|
    item.target[:path] if item.target[:type] == "file" && item.target[:path] != "?" && item.target[:operation] != "read"
  end.uniq
  executables = violations.filter_map do |item|
    item.target[:path] if item.target[:type] == "exec" && item.target[:path] != "?"
  end.uniq
  policy = {
    "network" => {
      "default" => "deny",
      "allow" => network + unix.map { |path| {"unix" => path} } + domains.map { |domain| {"domain" => domain} },
      "allow_unbound_listen" => unbound_listen
    },
    "write" => {"default" => "deny", "allow" => writes},
    "exec" => {"default" => "deny", "allow" => executables},
    "on_violation" => "fail"
  }
  FileUtils.mkdir_p(File.dirname(@path))
  flags = File::WRONLY | File::CREAT | (@force ? File::TRUNC : File::EXCL)
  File.open(@path, flags, 0o644) { |file| file.write(YAML.dump(policy)) }
  @path
rescue Errno::EEXIST
  raise ConfigurationError, "refusing to overwrite #{@path}; pass --force to replace it"
end