Class: Sqreen::Rules::ShellEnvCB

Inherits:
RegexpRuleCB show all
Defined in:
lib/sqreen/rules/shell_env_cb.rb

Overview

Callback that detect nifty env in system calls

Constant Summary

Constants inherited from RuleCB

RuleCB::DEFAULT_PAYLOAD

Constants included from CallCountable

CallCountable::COUNT_CALLS, CallCountable::FAILING, CallCountable::POST, CallCountable::PRE

Constants inherited from CB

CB::DEFAULT_PRIORITY

Instance Attribute Summary

Attributes inherited from RuleCB

#block, #payload_tpl, #test

Attributes included from CallCountable

#call_count_interval, #call_counts

Attributes inherited from FrameworkCB

#framework

Attributes inherited from CB

#klass, #method, #overtimeable

Instance Method Summary collapse

Methods inherited from RegexpRuleCB

#initialize, #match_regexp, #prepare

Methods inherited from RuleCB

#advise_action, #initialize, #overtime!, #priority, #record_event, #record_exception, #rule_name, #rulespack_id

Methods included from CallCountable

#count_callback_calls, #failing_with_count, #post_with_count, #pre_with_count

Methods included from Conditionable

#condition_callbacks, #failing_with_conditions, #post_with_conditions, #pre_with_conditions

Methods inherited from FrameworkCB

#record_observation, #whitelisted?

Methods inherited from CB

#failing?, #framework, #initialize, #overtime!, #post?, #pre?, #priority, #to_s, #whitelisted?

Constructor Details

This class inherits a constructor from Sqreen::Rules::RegexpRuleCB

Instance Method Details

#pre(_inst, args, _budget = nil, &_block) ⇒ Object 



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# File 'lib/sqreen/rules/shell_env_cb.rb', line 12

def pre(_inst, args, _budget = nil, &_block)
  return if args.size == 0
  env = args.first
  return unless env.is_a?(Hash)
  return if env.size == 0
  found = nil
  var, value = env.find do |_, val|
    next unless val.is_a?(String)
    found = match_regexp(val)
  end
  return unless var
  infos = {
    :variable_name => var,
    :variable_value => value,
    :found => found,
  }
  Sqreen.log.warn { "presence of a shell env tampering: #{infos.inspect}" }
  record_event(infos)
  advise_action(:raise)
end