Module: Msf::Exploit::Remote::Kerberos::ClockSkew

Defined in:
lib/msf/core/exploit/remote/kerberos/clock_skew.rb

Overview

Helper methods for handling Kerberos clock skew adjustments.

Constant Summary collapse

CLOCK_SKEW_REGEX = 
/\A([+-]?\d+(?:\.\d+)?(?:[smhd])?)+\z/i.freeze
UNIT_IN_SECONDS = 
{
  's' => 1,
  'm' => 60,
  'h' => 3_600,
  'd' => 86_400
}.freeze

Class Method Summary collapse

Class Method Details

.parse(value) ⇒ Float

Convert a user supplied clock skew value into seconds.

Parameters:

  • value (String, Numeric, nil) —

    The skew value to parse, e.g. '-5m', '120', 30

Returns:

  • (Float) —

    The skew in seconds

Raises:



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# File 'lib/msf/core/exploit/remote/kerberos/clock_skew.rb', line 25

def parse(value)
  return 0 if value.nil?
  return value.to_f if value.is_a?(Numeric)

  trimmed_value = value.to_s.strip
  return 0 if trimmed_value.empty?
  return trimmed_value.to_f if trimmed_value.match?(/\A[+-]?\d+(?:\.\d+)?\z/)
  raise Msf::OptionValidateError, 'Invalid KrbClockSkew format' unless trimmed_value.match?(CLOCK_SKEW_REGEX)

  total = 0
  trimmed_value.scan(/([+-]?\d+(?:\.\d+)?)([smhd]?)/i) do |amount, unit|
    unit = 's' if unit.blank?
    multiplier = UNIT_IN_SECONDS[unit.downcase]
    total += amount.to_f * multiplier
  end
  total
end