Module: Msf::DbConnector

Defined in:
lib/msf/core/db_connector.rb

Overview

This class is used when wanting to connect/disconnect framework from a particular database or http service

Constant Summary collapse

DbConfigGroup = 
'framework/database'

Class Method Summary collapse

Class Method Details

.as_connection_options(conf_options) ⇒ Object 



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# File 'lib/msf/core/db_connector.rb', line 297

def self.as_connection_options(conf_options)
  opts = {}
  https_opts = {}
  if conf_options
    opts[:url] = conf_options[:url] if conf_options[:url]
    opts[:api_token] = conf_options[:api_token] if conf_options[:api_token]
    https_opts[:cert] = conf_options[:cert] if conf_options[:cert]
    https_opts[:skip_verify] = conf_options[:skip_verify] if conf_options[:skip_verify]
  else
    return
  end

  opts[:https_opts] = https_opts unless https_opts.empty?
  opts
end

.build_postgres_url ⇒ Object 



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# File 'lib/msf/core/db_connector.rb', line 259

def self.build_postgres_url
  conn_params = ApplicationRecord.connection_db_config.configuration_hash
  url = ''
  url += "#{conn_params[:username]}" if conn_params[:username]
  url += ":#{conn_params[:password]}" if conn_params[:password]
  url += "@#{conn_params[:host]}" if conn_params[:host]
  url += ":#{conn_params[:port]}" if conn_params[:port]
  url += "/#{conn_params[:database]}" if conn_params[:database]
  url
end

.data_service_search(name: nil, url: nil) ⇒ Object

Search for a human readable data service name based on the search criteria The search criteria can match against a service name or url



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# File 'lib/msf/core/db_connector.rb', line 274

def self.data_service_search(name: nil, url: nil)
  conf = Msf::Config.load
  result = nil

  conf.each_pair do |key, value|
    conf_name = key.split('/').last
    has_name_match = !name.nil? && (conf_name == name)
    has_url_match = !url.nil? && (value.is_a?(Hash) && value['url'] == url)
    if has_name_match || has_url_match
      result = conf_name
    end
  end
  result
end

.db_connect(framework, opts = {}) ⇒ Object

Connect to the required database



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# File 'lib/msf/core/db_connector.rb', line 60

def self.db_connect(framework, opts = {})
  unless framework.db.driver
    return { error: 'No database driver installed.'}
  end

  if !opts[:url] && !opts[:yaml_file]
    return { error: 'A URL or saved data service name is required.' }
  end

  if opts[:url] =~ /http/
    new_conn_type = 'http'
  else
    new_conn_type = framework.db.driver
  end

  # Currently only able to be connected to one DB at a time
  if framework.db.connection_established?
    # But the http connection still requires a local database to support AR, so we have to allow that
    # Don't allow more than one HTTP service, though
    if new_conn_type != 'http' || framework.db.get_services_metadata.count >= 2
      return {
        error: 'Connection already established. Only one connection is allowed at a time. Run db_disconnect first if you wish to connect to a different data service.'
      }
    end
  end

  if opts[:yaml_file]
    db_connect_yaml(framework, opts)
  elsif new_conn_type == 'http'
    db_connect_http(framework, as_connection_options(opts))
  elsif new_conn_type == 'postgresql'
    db_connect_postgresql(framework, as_connection_options(opts))
  else
    {
      error: "This database driver #{new_conn_type} is not currently supported"
    }
  end
end

.db_connect_from_config(framework, path = nil) ⇒ Object

Connect to a database by using the default framework config, or the config file provided



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# File 'lib/msf/core/db_connector.rb', line 17

def self.db_connect_from_config(framework, path = nil)
  begin
    conf = Msf::Config.load(path)
  rescue StandardError => e
    wlog("Failed to load configuration: #{e}")
    return {}
  end

  if conf.group?(DbConfigGroup)
    conf[DbConfigGroup].each_pair do |k, v|
      next unless k.downcase == 'default_db'

      ilog 'Default data service found. Attempting to connect...'
      db_name = v
      config = load_db_config(db_name, path)
      if config
        if framework.db.active && config[:url] !~ /http/
          ilog 'Existing local data connection found. Disconnecting first.'
          db_disconnect(framework)
        end

        return db_connect(framework, config).merge(data_service_name: db_name)
      else
        elog "Config entry for '#{db_name}' could not be found. Config file might be corrupt."
      end
    end
  end

  {}
end

.db_connect_http(framework, opts) ⇒ Object

Connect to an existing http database



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# File 'lib/msf/core/db_connector.rb', line 157

def self.db_connect_http(framework, opts)
  # local database is required to use Mdm objects
  unless framework.db.active
    error = 'No local database connected, meaning some Metasploit features will not be available. A full list of '\
    'the affected features & database setup instructions can be found here: '\
    'https://docs.metasploit.com/docs/using-metasploit/intermediate/metasploit-database-support.html'

    return {
      error: error
    }
  end

  uri = db_parse_db_uri_http(opts[:url])

  remote_data_service = Metasploit::Framework::DataService::RemoteHTTPDataService.new(uri.to_s, opts)
  begin
    framework.db.register_data_service(remote_data_service)
    framework.db.workspace = framework.db.default_workspace
    {
      result: "Connected to HTTP data service: #{remote_data_service.name}",
      data_service_name: data_service_search(url: opts[:url])
    }
  rescue => e
    {
      error: "Failed to connect to the HTTP data service: #{e.message}"
    }
  end
end

.db_connect_postgresql(framework, cli_opts) ⇒ Object

Connect to an existing Postgres database



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# File 'lib/msf/core/db_connector.rb', line 189

def self.db_connect_postgresql(framework, cli_opts)
  info = db_parse_db_uri_postgresql(cli_opts[:url])
  opts = { 'adapter' => 'postgresql' }

  opts['username'] = info[:user] if (info[:user])
  opts['password'] = info[:pass] if (info[:pass])
  opts['database'] = info[:name]
  opts['host'] = info[:host] if (info[:host])
  opts['port'] = info[:port] if (info[:port])

  opts['pass'] ||= ''

  # Do a little legwork to find the real database socket
  if !opts['host']
    while(true)
      done = false
      dirs = %W{ /var/run/postgresql /tmp }
      dirs.each do |dir|
        if ::File.directory?(dir)
          d = ::Dir.new(dir)
          d.entries.grep(/^\.s\.PGSQL.(\d+)$/).each do |ent|
            opts['port'] = ent.split('.')[-1].to_i
            opts['host'] = dir
            done = true
            break
          end
        end
        break if done
      end
      break
    end
  end

  # Default to loopback
  unless opts['host']
    opts['host'] = '127.0.0.1'
  end

  if framework.db.connect(opts) && framework.db.connection_established?
    {
      result: "Connected to Postgres data service: #{info[:host]}/#{info[:name]}",
      data_service_name: data_service_search(url: opts[:url]) || framework.db.name
    }
  else
    {
      error: "Failed to connect to the Postgres data service: #{framework.db.error}"
    }
  end
end

.db_connect_yaml(framework, opts) ⇒ Object

Connect to a database via the supplied yaml file



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# File 'lib/msf/core/db_connector.rb', line 132

def self.db_connect_yaml(framework, opts)
  file = opts[:yaml_file] || ::File.join(Msf::Config.config_directory, 'database.yml')
  file = ::File.expand_path(file)
  unless ::File.exist?(file)
    return { error: 'File not found' }
  end
  begin
    db = YAML.load(::File.read(file))['production']
  rescue => _e
    return { error: 'File did not contain valid production database credentials' }
  end

  framework.db.connect(db)

  local_db_url = build_postgres_url
  local_name = data_service_search(url: local_db_url)
  return {
    result: 'Connected to the database specified in the YAML file',
    data_service_name: local_name
  }
end

.db_disconnect(framework) ⇒ Object

Disconnect from the currently connected database. This will gracefully fallback from a remote data service to a local postgres instance if configured correctly.



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# File 'lib/msf/core/db_connector.rb', line 103

def self.db_disconnect(framework)
  result = { old_data_service_name: framework.db.name }
  unless framework.db.driver
    result[:error] = 'No database driver installed.'
    return result
  end

  if framework.db.active
    if framework.db.driver == 'http'
      begin
        framework.db.delete_current_data_service
        local_db_url = build_postgres_url
        local_name = data_service_search(url: local_db_url)
        result[:data_service_name] = local_name
      rescue StandardError => e
        result[:error] = e.message
      end
    else
      framework.db.disconnect
      result[:data_service_name] = nil
    end
  end

  result
end

.db_parse_db_uri_http(path) ⇒ Object 



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# File 'lib/msf/core/db_connector.rb', line 255

def self.db_parse_db_uri_http(path)
  URI.parse(path)
end

.db_parse_db_uri_postgresql(path) ⇒ Object 



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# File 'lib/msf/core/db_connector.rb', line 239

def self.db_parse_db_uri_postgresql(path)
  res = {}
  if path
    auth, dest = path.split('@')
    (dest = auth and auth = nil) if not dest
    # remove optional scheme in database url
    auth = auth.sub(/^\w+:\/\//, '') if auth
    res[:user],res[:pass] = auth.split(':') if auth
    targ,name = dest.split('/')
    (name = targ and targ = nil) if not name
    res[:host],res[:port] = targ.split(':') if targ
  end
  res[:name] = name || 'metasploit3'
  res
end

.load_db_config(db_name, path = nil) ⇒ Object 



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# File 'lib/msf/core/db_connector.rb', line 289

def self.load_db_config(db_name, path = nil)
  conf = Msf::Config.load(path)
  conf_options = conf["#{DbConfigGroup}/#{db_name}"]
  return unless conf_options

  conf_options.transform_keys(&:to_sym)
end