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# -*- coding: binary -*-
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module Rex
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module Parser
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# This is a parser for the Windows Unattended Answer File
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# format. It's used by modules/post/windows/gather/enum_unattend.rb
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# and uses REXML (as opposed to Nokogiri) for its XML parsing.
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# See: http://technet.microsoft.com/en-us/library/ff715801
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#      http://technet.microsoft.com/en-us/library/cc749415(v=ws.10).aspx
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# Samples: http://technet.microsoft.com/en-us/library/cc732280%28v=ws.10%29.aspx
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class Unattend
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  require 'rex/text'
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  def self.parse(xml)
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    return [] if xml.nil?
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    results = []
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    unattend = xml.elements['unattend']
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    return [] if unattend.nil?
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    unattend.each_element do |settings|
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        next if settings.class != REXML::Element
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        settings.get_elements('component').each do |c|
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          next if c.class != REXML::Element
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          results << extract_useraccounts(c.elements['UserAccounts'])
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          results << extract_autologon(c.elements['AutoLogon'])
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          results << extract_deployment(c.elements['WindowsDeploymentServices'])
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          results << extract_domain_join(c.elements['Identification/Credentials'])
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        end
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      end
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    return results.flatten
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  end
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  #
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  # Extract sensitive data from Deployment Services.
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  # We can only seem to add one <Login> with Windows System Image Manager, so
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  # we'll only enum one.
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  #
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  def self.extract_deployment(deployment)
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    return [] if deployment.nil?
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    domain    = deployment.elements['Login/Credentials/Domain'].get_text.value rescue ''
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    username  = deployment.elements['Login/Credentials/Username'].get_text.value rescue ''
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    password  = deployment.elements['Login/Credentials/Password'].get_text.value rescue ''
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    plaintext = deployment.elements['Login/Credentials/Password/PlainText'].get_text.value rescue 'true'
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    if plaintext == 'false'
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      password = Rex::Text.decode_base64(password)
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      password = password.gsub(/#{Rex::Text.to_unicode('Password')}$/, '')
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    end
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    return {'type' => 'wds', 'domain' => domain, 'username' => username, 'password' => password }
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  end
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  #
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  # Extract sensitive data from 'Secure' Domain Join
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  #
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  def self.extract_domain_join(credentials)
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    return [] if credentials.nil?
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    domain    = credentials.elements['Domain'].get_text.value rescue ''
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    username  = credentials.elements['Username'].get_text.value rescue ''
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    password  = credentials.elements['Password'].get_text.value rescue ''
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    return {'type' => 'domain_join', 'domain' => domain, 'username' => username, 'password' => password }
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  end
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  #
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  # Extract sensitive data from AutoLogon
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  #
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  def self.extract_autologon(auto_logon)
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    return [] if auto_logon.nil?
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    domain    = auto_logon.elements['Domain'].get_text.value rescue ''
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    username  = auto_logon.elements['Username'].get_text.value rescue ''
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    password  = auto_logon.elements['Password/Value'].get_text.value rescue ''
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    plaintext = auto_logon.elements['Password/PlainText'].get_text.value rescue 'true'
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    if plaintext == 'false'
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      password = Rex::Text.decode_base64(password)
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      password = password.gsub(/#{Rex::Text.to_unicode('Password')}$/, '')
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    end
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    return {'type' => 'auto', 'domain' => domain, 'username' => username, 'password' => password }
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  end
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  #
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  # Extract sensitive data from UserAccounts
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  #
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  def self.extract_useraccounts(user_accounts)
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    return[] if user_accounts.nil?
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    results = []
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    account_types = ['AdministratorPassword', 'DomainAccounts', 'LocalAccounts']
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    account_types.each do |t|
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      element = user_accounts.elements[t]
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      next if element.nil?
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      case t
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      #
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      # Extract the password from AdministratorPasswords
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      #
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      when account_types[0]
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        password = element.elements['Value'].get_text.value rescue ''
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        plaintext = element.elements['PlainText'].get_text.value rescue 'true'
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        if plaintext == 'false'
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          password = Rex::Text.decode_base64(password)
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          password = password.gsub(/#{Rex::Text.to_unicode('AdministratorPassword')}$/, '')
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        end
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        unless password.empty?
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          results << {'type' => 'admin', 'username' => 'Administrator', 'password' => password}
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        end
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      #
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      # Extract the sensitive data from DomainAccounts.
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      # According to MSDN, unattend.xml doesn't seem to store passwords for domain accounts
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      #
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      when account_types[1]  #DomainAccounts
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        element.elements.each do |account_list|
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          name = account_list.elements['DomainAccount/Name'].get_text.value rescue ''
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          group = account_list.elements['DomainAccount/Group'].get_text.value rescue 'true'
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          results << {'type' => 'domain', 'username' => name, 'group' => group}
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        end
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      #
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      # Extract the username/password from LocalAccounts
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      #
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      when account_types[2]  #LocalAccounts
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        element.elements.each do |local|
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          password = local.elements['Password/Value'].get_text.value rescue ''
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          plaintext = local.elements['Password/PlainText'].get_text.value rescue 'true'
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          if plaintext == 'false'
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            password = Rex::Text.decode_base64(password)
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            password = password.gsub(/#{Rex::Text.to_unicode('Password')}$/, '')
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          end
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          username = local.elements['Name'].get_text.value rescue ''
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          results << {'type' => 'local', 'username' => username, 'password' => password}
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        end
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      end
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    end
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    return results
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  end
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  def self.create_table(results)
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    return nil if results.nil? or results.empty?
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    table = Rex::Text::Table.new({
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      'Header' => 'Unattend Credentials',
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      'Indent' => 1,
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      'Columns' => ['Type', 'Domain', 'Username', 'Password', 'Groups']
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    })
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    results.each do |result|
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      case result['type']
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        when 'wds', 'auto', 'domain_join'
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          table << [result['type'], result['domain'], result['username'], result['password'], ""]
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        when 'admin', 'local'
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          table << [result['type'], "", result['username'], result['password'], ""]
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        when 'domain'
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          table << [result['type'], "", result['username'], "", result['group']]
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      end
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    end
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    return table
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  end
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end
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end
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end
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