Class: Qualys::WAS::Vulnerability

Inherits:
Object
  • Object
show all
Defined in:
lib/qualys/was/vulnerability.rb

Overview

This class represents each of the WAS_SCAN_REPORT/RESULTS/VULNERABILITY_LIST/ VULNERABILITY elements in the Qualys WAS XML document.

It provides a convenient way to access the information scattered all over the XML in attributes and nested tags.

Instead of providing separate methods for each supported property we rely on Ruby’s #method_missing to do most of the work.

Instance Method Summary collapse

Constructor Details

#initialize(xml_node) ⇒ Vulnerability

Accepts an XML node from Nokogiri::XML.



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# File 'lib/qualys/was/vulnerability.rb', line 12

def initialize(xml_node)
  @xml = xml_node
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object

This method is invoked by Ruby when a method that is not defined in this instance is called.

In our case we inspect the @method@ parameter and try to find the attribute, simple descendent or collection that it maps to in the XML tree.



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# File 'lib/qualys/was/vulnerability.rb', line 41

def method_missing(method, *args)
  # We could remove this check and return nil for any non-recognized tag.
  # The problem would be that it would make tricky to debug problems with
  # typos. For instance: <>.potr would return nil instead of raising an
  # exception
  unless supported_tags.include?(method)
    super
    return
  end

  # Any fields where a simple .camelcase() won't work we need to translate,
  # this includes acronyms (e.g. :cwe would become 'Cwe') and simple nested
  # tags.
  translations_table = {
    access_paths:       'ACCESS_PATH/URL',
    request_headers:    'PAYLOADS/PAYLOAD/REQUEST/HEADERS',
    request_method:     'PAYLOADS/PAYLOAD/REQUEST/METHOD',
    request_url:        'PAYLOADS/PAYLOAD/REQUEST/URL',
    response_contents:  'PAYLOADS/PAYLOAD/RESPONSE/CONTENTS',
    response_evidence:  'PAYLOADS/PAYLOAD/RESPONSE/EVIDENCE'
  }

  method_name = translations_table.fetch(method, method.to_s.upcase)

  # Then we try simple children tags: TITLE, LAST_UPDATE, CVSS_BASE...
  tag = @xml.at_xpath("./#{method_name}")
  if tag && !tag.text.blank?
    if tags_with_base64.include?(method)
      return decode_base64(tag)
    else
      return tag.text
    end
  else
    'n/a'
  end

end

Instance Method Details

#respond_to?(method, include_private = false) ⇒ Boolean

This allows external callers (and specs) to check for implemented properties

Returns:

  • (Boolean) 


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# File 'lib/qualys/was/vulnerability.rb', line 30

def respond_to?(method, include_private=false)
  return true if supported_tags.include?(method.to_sym)
  super
end

#supported_tags ⇒ Object

List of supported tags. They can be attributes, simple descendans or collections (e.g. <references/>, <tags/>)



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# File 'lib/qualys/was/vulnerability.rb', line 18

def supported_tags
  [
    # simple tags
    :access_paths, :ajax, :authentication, :ignored, :potential, :url,

    # nested tags
    :response_contents, :response_evidence, :request_headers, :request_method, :request_url
  ]
end