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# -*- coding: binary -*-
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###
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#
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# This mixin provides helper methods for Cacti
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#
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###
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module Msf
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module Exploit::Cacti
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  include Msf::Exploit::Remote::HttpClient
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  class CactiError < StandardError; end
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  class CactiNotFoundError < CactiError; end
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  class CactiVersionNotFoundError < CactiError; end
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  class CactiNoAccessError < CactiError; end
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  class CactiCsrfNotFoundError < CactiError; end
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  class CactiLoginError < CactiError; end
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  # Extract the version number from an HTML response
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  #
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  # @param html [Nokogiri::HTML::Document] The HTML response
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  # @return [String] The version number
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  # @raise [CactiNotFoundError] If the web server is not running Cacti
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  # @raise [CactiVersionNotFoundError] If the version string was not found
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  def parse_version(html)
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    # This will return an empty string if there is no match
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    version_str = html.xpath('//div[@class="versionInfo"]').text
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    unless version_str.include?('The Cacti Group')
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      raise CactiNotFoundError, 'The web server is not running Cacti'
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    end
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    unless version_str.match(/Version (?<version>\d{1,2}[.]\d{1,2}[.]\d{1,2})/)
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      raise CactiVersionNotFoundError, 'Could not detect the version'
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    end
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    Regexp.last_match[:version]
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  end
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  # Extract the CSRF token from an HTML response
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  #
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  # @param html [Nokogiri::HTML::Document] The HTML response to parse
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  # @return [String] The CSRF token
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  def parse_csrf_token(html)
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    html.xpath('//form/input[@name="__csrf_magic"]/@value').text
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  end
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  # Get the CSRF token by querying the `index.php` web page and extracting it
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  # from the response.
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  #
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  # @return [String] The CSRF token
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  # @raise [CactiNoAccessError] If the server is unreachable
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  # @raise [CactiCsrfNotFoundError] If it was not possible to get the CSRF token
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  def get_csrf_token
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    res = send_request_cgi(
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      'uri' => normalize_uri(target_uri.path, 'index.php'),
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      'method' => 'GET',
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      'keep_cookies' => true
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    )
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    raise CactiNoAccessError, 'Could not access `index.php` - no response' if res.nil?
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    html = res.get_html_document
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    csrf_token = parse_csrf_token(html)
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    raise CactiCsrfNotFoundError, 'Unable to get the CSRF token' if csrf_token.empty?
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    csrf_token
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  end
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  # Log in to Cacti. It will take care of grabbing the CSRF token if not provided.
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  #
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  # @param username [String] The username
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  # @param password [String] The password
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  # @raise [CactiNoAccessError] If the server is unreachable
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  # @raise [CactiCsrfNotFoundError] If the CSRF token was not provided and it was not possible to retrieve it
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  # @raise [CactiLoginError] If the login failed
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  def do_login(username, password, csrf_token: nil)
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    if csrf_token.blank?
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      print_status('Getting the CSRF token to login')
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      begin
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        csrf_token = get_csrf_token
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      rescue CactiError => e
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        raise CactiLoginError, "Unable to login: #{e.class} - #{e}"
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      end
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      vprint_good("CSRF token: #{csrf_token}")
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    end
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    print_status("Attempting login with user `#{username}` and password `#{password}`")
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    res = send_request_cgi(
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      'uri' => normalize_uri(target_uri.path, 'index.php'),
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      'method' => 'POST',
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      'keep_cookies' => true,
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      'vars_post' => {
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        '__csrf_magic' => csrf_token,
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        'action' => 'login',
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        'login_username' => username,
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        'login_password' => password
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      }
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    )
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    raise CactiNoAccessError, 'Could not login - no response' if res.nil?
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    raise CactiLoginError, "Login failure - unexpected HTTP response code: #{res.code}" unless res.code == 302
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    print_good('Logged in')
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    nil
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  end
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end
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end
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