Class: Puppet::Provider::Firewall::Firewall

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet/provider/firewall/firewall.rb

Overview

Implementation for the iptables type using the Resource API.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.create_absent(namevar, title) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/provider/firewall/firewall.rb', line 726

def self.create_absent(namevar, title)
  result = if title.is_a? Hash
             title.dup
           else
             { namevar => title }
           end
  result[:ensure] = 'absent'
  result
end

.get_rules(context, basic, protocols = ['IPv4', 'IPv6']) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Retrieve the rules Optional values lets you return a simplified set of data, used for determining order when adding/updating/deleting rules,

while also allowing for the protocols used to retrieve the rules to be limited.



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# File 'lib/puppet/provider/firewall/firewall.rb', line 462

def self.get_rules(context, basic, protocols = ['IPv4', 'IPv6'])
  # Create empty return array
  rules = []
  counter = 1
  # For each protocol
  protocols.each do |protocol|
    # Retrieve String containing all information
    iptables_list = Puppet::Provider.execute($list_command[protocol])
    # Scan String to retrieve all Rules
    iptables_list.scan($table_regex).each do |table|
      table_name = table[0].scan($table_name_regex)[0][0]
      table[0].scan($rules_regex).each do |rule|
        raw_rules = if basic
                      Puppet::Provider::Firewall::Firewall.rule_to_name(context, rule[0], table_name, protocol)
                    else
                      Puppet::Provider::Firewall::Firewall.rule_to_hash(context, rule[0], table_name, protocol)
                    end
        # Process the returned values so that it is correct for our purposes
        rules << Puppet::Provider::Firewall::Firewall.process_get(context, raw_rules, rule[0], counter)
        counter += 1
      end
    end
    # Return array
  end
  rules
end

.hash_to_rule(_context, _name, rule) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Converts a given hash value to a command line argument



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# File 'lib/puppet/provider/firewall/firewall.rb', line 917

def self.hash_to_rule(_context, _name, rule)
  arguments = ''

  # We loop through an ordered list of all flags as the order that they are added is important
  $resource_list.each do |key|
    next unless rule[key]

    value = rule[key]

    # Ensure that the necesary module (`-m`) arguments are added when needed
    # addrtype and ipset are exceptions as they need to preface each instance
    @module_to_argument_mapping.each do |modules|
      # Skip unless the key is part of the module
      next unless modules[1].include?(key)
      # Skip if the module flag has already been added
      next if arguments.match(Regexp.new("-m #{modules[0]}"))

      # Add the module flag
      arguments += " -m #{modules[0]}"
    end

    # if resource is known_boolean
    if $known_booleans.include?(key)
      # If value is true, append command to arguments
      arguments += " #{$resource_map[key]}" if value
      next
    end

    # check for existence, retrieve string that follows if it is
    # certain resources may need special rules
    case key
    when :name, :string, :string_hex, :bytecode, :u32, :nflog_prefix, :log_prefix
      arguments += " #{[$resource_map[key], "'#{rule[key]}'"].join(' ')}" if rule[key].match?(%r{^[^!]}) # if standard
      arguments += " #{['!', $resource_map[key], "'#{rule[key].gsub(%r{^!\s?}, '')}'"].join(' ')}" if rule[key].match?(%r{^!}) # if negated
    when :sport, :dport
      if rule[key].is_a?(Array) && rule[key][0].to_s.match(%r{^!})
        # Negated Multiport
        split_comannd = $resource_map[key][0].split(%r{ })
        negated_command = [split_comannd[0], split_comannd[1], '!', split_comannd[2]].join(' ')
        value = rule[key].join(',').gsub(%r{^!\s?}, '')
        arguments += " #{[negated_command, value].join(' ')}"
      elsif rule[key].is_a?(Array)
        # Standard Multiport
        arguments += " #{[$resource_map[key][0], rule[key].join(',')].join(' ')}"
      elsif rule[key].to_s.match?(%r{^!})
        # Negated Standard
        arguments += " #{['!', $resource_map[key][1], rule[key].gsub(%r{^!\s?}, '')].join(' ')}"
      else
        # Standard
        arguments += " #{[$resource_map[key][1], rule[key]].join(' ')}"
      end
    when :src_type, :dst_type, :ipset, :match_mark, :mss, :connmark
      # Code for if value requires it's own flag each time it is applied
      split_command = $resource_map[key].split(%r{ })
      negated_command = [split_command[0], split_command[1], '!', split_command[2]].join(' ')

      # If a string, wrap as an array to simplify the code
      rule[key] = [rule[key]] if rule[key].is_a?(String)
      rule[key].each do |ru|
        arguments += " #{$resource_map[key]} #{ru}" unless ru.match?(%r{^!})
        arguments += " #{negated_command} #{ru.gsub(%r{^!\s?}, '')}" if ru.match?(%r{^!})
      end
    when :state, :ctstate, :ctstatus, :month_days, :week_days
      # Code for if value is an array and all values are joined together and passed as part of a single flag
      # If not an array, wrap as an array to simplify the code
      rule[key] = [rule[key]] unless rule[key].is_a?(Array)
      int_attr = [:month_days]
      arguments += " #{[$resource_map[key], rule[key].join(',')].join(' ')}" if int_attr.include?(key) || rule[key][0].match(%r{^[^!]}) # if standard
      arguments += " #{['!', $resource_map[key], rule[key].join(',').gsub(%r{^!\s?}, '')].join(' ')}" if !int_attr.include?(key) && rule[key][0].match(%r{^!}) # if negated
    when :icmp
      case rule[:protocol]
      when 'IPv4', 'iptables'
        proto = 0
      when 'IPv6', 'ip6tables'
        proto = 1
      end
      # Retrieve the correct command for the protocol
      # A command is generated to be used for negation
      split_comannd = $resource_map[key][proto].split(%r{ })
      negated_command = [split_comannd[0], split_comannd[1], '!', split_comannd[2]].join(' ')

      arguments += " #{[$resource_map[key][proto], rule[key]].join(' ')}" if rule[key].match?(%r{^[^!]}) # if standard
      arguments += " #{[negated_command, rule[key].gsub(%r{^!\s?}, '')].join(' ')}" if rule[key].match?(%r{^!}) # if negated
    when :recent
      # Add value after command, if negated add negation before command
      # Preface the value of recent with `--`
      arguments += " #{$resource_map[key]} --#{rule[key]}" if rule[key].match?(%r{^[^!]}) # if standard
      arguments += " #{$resource_map[key]} ! --#{rule[key].gsub(%r{^!\s?}, '')}" if rule[key].match?(%r{^!}) # if negated
    when :rpfilter
      # Add value after command
      # Preface the value of recent with `--`
      # If a string, wrap as an array to simplify the code
      rule[key] = [rule[key]] if rule[key].is_a?(String)
      arguments += " #{$resource_map[key]} --#{rule[key].join(' --')}"
    when :proto, :source, :destination, :iniface, :outiface, :physdev_in, :physdev_out, :src_range, :dst_range,
          :tcp_option, :tcp_flags, :uid, :gid, :mac_source, :pkttype, :ctproto, :ctorigsrc, :ctorigdst, :ctreplsrc,
          :ctrepldst, :ctorigsrcport, :ctorigdstport, :ctreplsrcport, :ctrepldstport, :ctexpire, :cgroup, :hop_limit
      # Add value after command, if negated add negation before command
      arguments += " #{[$resource_map[key], rule[key]].join(' ')}" if rule[key].is_a?(Integer) || rule[key].match?(%r{^[^!]}) # if standard
      arguments += " #{['!', $resource_map[key], rule[key].gsub(%r{^!\s?}, '')].join(' ')}" if rule[key].is_a?(String) && rule[key].match?(%r{^!}) # if negated
    else # :chain, stat_mode, stat_every, stat_packet, stat_probability, socket, ipsec_dir, ipsec_policy, :ctdir,
      # :limit, :burst, :length, :rseconds, :rhitcount, :rname, :mask, :string_algo, :string_from, :string_to,
      # :jump, :goto, :clusterip_hashmode, :clusterip_clustermac, :clusterip_total_nodes, :clusterip_local_node,
      # :clusterip_hash_init, :queue_num, :nflog_group, :nflog_range, :nflog_size, :nflog_threshold,
      # :gateway, :set_mss, :set_dscp, :set_dscp_class, :todest, :tosource, :toports, :to, :log_level,
      # :reject, :set_mark, :connlimit_upto, :connlimit_above, :connlimit_mask, :time_start, :time_stop, :date_start,
      # :date_stop, :src_cc, :dst_cc, :hashlimit_upto, :hashlimit_above, :hashlimit_name, :hashlimit_burst, :hashlimit_mode,
      # :hashlimit_srcmask, :hashlimit_dstmask, :hashlimit_htable_size, :hashlimit_htable_max, :hashlimit_htable_expire,
      # :hashlimit_htable_gcinterval, :zone, :helper, :condition
      # Add value after command
      arguments += " #{[$resource_map[key], rule[key]].join(' ')}"
    end
  end
  arguments
end

.insert_order(context, name, chain, table, protocol) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Find the correct position for our new rule in its chain This has been lifted from the previous provider in order to maintain the logic between them



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# File 'lib/puppet/provider/firewall/firewall.rb', line 1036

def self.insert_order(context, name, chain, table, protocol)
  rules = []
  # Find any rules that match the given chain and table pairing
  Puppet::Provider::Firewall::Firewall.get_rules(context, true, [protocol]).each do |rule|
    rules << rule[:name] if rule[:chain] == chain && rule[:table] == table
  end

  # If no rules found, return 1
  return 1 if rules.empty?

  # Find if this is a new or eisting rule
  if rules.include? name
    # If the rule already exists, use it as the offset
    offset_rule = name
  else
    # If it doesn't add it to the list and find it's ordered location
    rules << name
    new_rule_location = rules.sort.uniq.index(name)
    offset_rule = if new_rule_location.zero?
                    # First and only rule
                    rules[0]
                  else
                    # This rule will come after other managed rules, so find the rule
                    # immediately preceeding it.
                    rules.sort.uniq[new_rule_location - 1]
                  end
  end
  # Count how many unmanaged rules are ahead of the target rule so we know
  # how much to add to the insert order
  unnamed_offset = rules[0..rules.index(offset_rule)].reduce(0) do |sum, rule|
    # This regex matches the names given to unmanaged rules (a number
    # 9000-9999 followed by an MD5 hash).
    sum + (rule.match($unmanaged_rule_regex) ? 1 : 0)
  end

  # We want our rule to come before unmanaged rules if it's not a 9-rule
  unnamed_offset -= 1 if offset_rule.match($unmanaged_rule_regex) && !name.match(%r{^9})

  # Insert our new or updated rule in the correct order of named rules, but
  # offset for unnamed rules.
  sorted_rules = rules.reject { |r| r.match($unmanaged_rule_regex) }.sort
  sorted_rules.index(name) + 1 + unnamed_offset
end

.process_get(_context, rule_hash, rule, counter) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Certain attributes need custom logic to ensure that they are returning the correct information



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# File 'lib/puppet/provider/firewall/firewall.rb', line 703

def self.process_get(_context, rule_hash, rule, counter)
  # Puppet-firewall requires that all rules have structured comments (resource names) and will fail if a
  # rule in iptables does not have a matching comment.
  if !rule_hash.key?(:name)
    num = 9000 + counter
    rule_hash[:name] = "#{num} #{Digest::SHA256.hexdigest(rule)}"
  elsif !rule_hash[:name].match(%r{(^\d+(?:[ \t-]\S+)+$)})
    num = 9000 + counter
    rule_hash[:name] = "#{num} #{rule_hash[:name]}"
  end

  # If no specific proto has been set we treat it as having `all` set
  rule_hash[:proto] = 'all' unless rule_hash[:proto]
  # Certain OS can return the proto as it;s equivalent number and we make sure to convert it in that case
  rule_hash[:proto] = PuppetX::Firewall::Utility.proto_number_to_name(rule_hash[:proto])

  # If a dscp numer is found, also return it as it's valid class name
  rule_hash[:set_dscp_class] = PuppetX::Firewall::Utility.dscp_number_to_class(rule_hash[:set_dscp]) if rule_hash[:set_dscp]

  rule_hash
end

.process_input(should) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Certain attributes need processed in ways that can vary between IPv4 and IPv6



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# File 'lib/puppet/provider/firewall/firewall.rb', line 854

def self.process_input(should)
  # `dport`, `sport` `state` `ctstate` and `ctstatus` arrays should only have the first value negated.
  [:dport, :sport, :state, :ctstate, :ctstatus].each do |key|
    next unless should[key].is_a?(Array)

    negated = true if %r{^!\s}.match?(should[key][0].to_s)
    should[key].each_with_index do |_value, _index|
      should[key] = should[key].map { |value| value.to_s.tr('! ', '') }
    end
    should[key][0] = ['!', should[key][0]].join(' ') if negated
  end

  # `jump` common values should always be uppercase
  jump_common_values = ['accept', 'reject', 'drop', 'queue', 'return', 'dnat', 'snat', 'log', 'nflog',
                        'netmp', 'masquerade', 'redirect', 'mark', 'ct']
  should[:jump] = should[:jump].upcase if should[:jump] && jump_common_values.include?(should[:jump].downcase)

  # `source` and `destination` must be put through host_to_mask
  should[:source] = PuppetX::Firewall::Utility.host_to_mask(should[:source], should[:protocol]) if should[:source]
  should[:destination] = PuppetX::Firewall::Utility.host_to_mask(should[:destination], should[:protocol]) if should[:destination]

  # ct attributes must be put through host_to_mask with certain masks then being removed
  ct = [:ctorigsrc, :ctorigdst, :ctreplsrc, :ctrepldst]
  ct.each do |c|
    break unless should[c]

    value = PuppetX::Firewall::Utility.host_to_mask(should[c], should[:protocol])
    should[c] = if should[:protocol] == 'IPv4'
                  value.chomp('/32')
                else
                  value.chomp('/128')
                end
  end

  # `icmp` needs to be converted to a number if passed as a string
  should[:icmp] = PuppetX::Firewall::Utility.icmp_name_to_number(should[:icmp], should[:protocol]) if should[:icmp]

  # `log_level` needs to be converted to a number if passed as a string
  should[:log_level] = PuppetX::Firewall::Utility.log_level_name_to_number(should[:log_level]) if should[:log_level]

  # `set_mark`, `match_mark` and `connmark` must be applied in hexidecimal format
  should[:set_mark] = PuppetX::Firewall::Utility.mark_mask_to_hex(should[:set_mark]) if should[:set_mark]
  should[:match_mark] = PuppetX::Firewall::Utility.mark_to_hex(should[:match_mark]) if should[:match_mark]
  should[:connmark] = PuppetX::Firewall::Utility.mark_to_hex(should[:connmark]) if should[:connmark]

  # `time_start` and `time_stop` must be applied in full HH:MM:SS format
  time = [:time_start, :time_stop]
  time.each do |t|
    should[t] = "0#{should[t]}" if %r{^([0-9]):}.match?(should[t])
    should[t] = "#{should[t]}:00" if %r{^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$}.match?(should[t])
  end

  # If `sport/dport` range has been passed with `-`, replace with `:`
  should[:sport] = should[:sport].to_s.tr('-', ':') if should[:sport].is_a?(String)
  should[:dport] = should[:dport].to_s.tr('-', ':') if should[:dport].is_a?(String)
  should[:sport] = should[:sport].map { |port| port.to_s.tr('-', ':') } if should[:sport].is_a?(Array)
  should[:dport] = should[:dport].map { |port| port.to_s.tr('-', ':') } if should[:dport].is_a?(Array)

  should
end

.rule_to_hash(_context, rule, table_name, protocol) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Converts a given rule to a hash value



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# File 'lib/puppet/provider/firewall/firewall.rb', line 510

def self.rule_to_hash(_context, rule, table_name, protocol)
  # loop through resource map
  rule_hash = {}
  rule_hash[:ensure] = 'present'
  rule_hash[:table] = table_name
  rule_hash[:protocol] = protocol
  rule_hash[:line] = rule
  # Add the ensure parameter first
  $resource_map.each do |key, value|
    if $known_booleans.include?(key)
      # check for flag with regex, add a space/line end to ensure accuracy with the more simplistic flags; i.e. `-f`, `--random`
      rule_hash[key] = if rule.match(Regexp.new("#{value}(\\s|$)"))
                         true
                       else
                         false
                       end
      next
    end

    case key
    when :name, :string, :string_hex, :bytecode, :u32, :nflog_prefix, :log_prefix
      # When :name/:string/:string_hex/:bytecode, return everything inside the double quote pair following the key value
      # When only a single word comment is returned no quotes are given, so we must check for this as well
      # First find if flag is present, add a space to ensure accuracy with the more simplistic flags; i.e. `-i`
      if rule.match(Regexp.new("#{value}\\s"))
        value_regex = Regexp.new("(?:(!\\s))?#{value}\\s(?:\"([^\"]*)|([^\"\\s]*))")
        key_value = rule.scan(value_regex)[0]
        # Combine the returned values and remove and trailing or leading whitespace
        key_value[1] = [key_value[0], key_value[1], key_value[2]].join
        rule_hash[key] = key_value[1] if key_value[1]
      end
    when :sport, :dport
      split_value_regex = value[0].split(%r{ })
      negated_multi_regex = [split_value_regex[0], split_value_regex[1], '!', split_value_regex[2]].join(' ')
      if rule.match(value[0])
        # First check against the multiport value, if found split and return as an array
        value_regex = Regexp.new("#{value[0]}\\s(\\S+)")
        key_value = rule.scan(value_regex)[0]
        rule_hash[key] = key_value[0].split(%r{,})
      elsif rule.match(negated_multi_regex)
        # Next check against a negated multiport value, if found split and return as an array with the first value negated
        value_regex = Regexp.new("#{negated_multi_regex}\\s(\\S+)")
        key_value = rule.scan(value_regex)[0]

        # Add '!' to the beginning of the first value to show it as negated
        split_value = key_value[0].split(%r{,})
        split_value[0] = "! #{split_value[0]}"
        rule_hash[key] = split_value
      elsif rule.match(value[1])
        # If no multi value matches, check against the regular value instead
        value_regex = Regexp.new("(?:(!)\\s)?#{value[1]}\\s(\\S+)")
        key_value = rule.scan(value_regex)[0]
        # If it is negated, combine the retrieved '!' with the actual value to make one string
        key_value[1] = [key_value[0], key_value[1]].join(' ') unless key_value[0].nil?
        rule_hash[key] = key_value[1]
      end
    when :tcp_flags
      # First find if flag is present, add a space to ensure accuracy with the more simplistic flags; i.e. `-i`
      if rule.match(Regexp.new("#{value}\\s"))
        value_regex = Regexp.new("(?:(!)\\s)?#{value}\\s(\\S+)\\s(\\S+)")
        key_value = rule.scan(value_regex)[0]
        # If a negation is found combine it with the first retrieved value, then combine both values
        key_value[1] = [key_value[0], key_value[1]].join(' ') unless key_value[0].nil?
        rule_hash[key] = [key_value[1], key_value[2]].join(' ')
      end
    when :src_type, :dst_type, :ipset, :match_mark, :mss, :connmark
      split_regex = value.split(%r{ })
      if rule.match(Regexp.new("#{split_regex[1]}\\s(?:(!)\\s)?#{split_regex[2]}\\s"))
        # The exact information retrieved changes dependeing on the key
        type_attr = [:src_type, :dst_type]
        value_regex = Regexp.new("#{split_regex[1]}\\s(?:(!)\\s)?#{split_regex[2]}\\s(\\S+)\\s?(--limit-iface-(?:in|out))?") if type_attr.include?(key)
        ip_attr = [:ipset]
        value_regex = Regexp.new("#{split_regex[1]}\\s(?:(!)\\s)?#{split_regex[2]}\\s(\\S+\\s\\S+)") if ip_attr.include?(key)
        mark_attr = [:match_mark, :mss, :connmark]
        value_regex = Regexp.new("#{split_regex[1]}\\s(?:(!)\\s)?#{split_regex[2]}\\s(\\S+)") if mark_attr.include?(key)
        # Since multiple values can be recovered, we must loop through each instance
        type_value = []
        key_value = rule.scan(value_regex)
        key_value.length.times do |i|
          type_value.append(key_value[i].join(' ').strip) if key_value[i]
        end
        # If only a single value was found return as a string
        rule_hash[key] = type_value[0] if type_value.length == 1
        rule_hash[key] = type_value if type_value.length > 1
      end
    when :state, :ctstate, :ctstatus, :month_days, :week_days
      if rule.match(Regexp.new("#{value}\\s"))
        value_regex = Regexp.new("(?:(!)\\s)?#{value}\\s(\\S+)")
        key_value = rule.scan(value_regex)
        split_value = key_value[0][1].split(%r{,})
        # If negated add to first value
        split_value[0] = [key_value[0][0], split_value[0]].join(' ') unless key_value[0][0].nil?
        # If value is meant to be Int, return as such
        int_attr = [:month_days]
        split_value = split_value.map(&:to_i) if int_attr.include?(key)
        # If only a single value is found, strip the Array wrapping
        split_value = split_value[0] if split_value.length == 1
        rule_hash[key] = split_value
      end
    when :icmp
      case protocol
      when 'IPv4', 'iptables'
        proto = 0
      when 'IPv6', 'ip6tables'
        proto = 1
      end

      if rule.match(Regexp.new("#{value[proto]}\\s"))
        value_regex = Regexp.new("#{value[proto]}\\s(\\S+)")
        key_value = rule.scan(value_regex)[0]
        rule_hash[key] = key_value[0]
      end
    when :recent
      if rule.match(Regexp.new("#{value}\\s"))
        value_regex = Regexp.new("#{value}\\s(!\\s)?--(\\S+)")
        key_value = rule.scan(value_regex)[0]
        # If it has, combine the retrieved '!' with the actual value to make one string
        key_value[1] = [key_value[0], key_value[1]].join unless key_value[0].nil?
        rule_hash[key] = key_value[1] if key_value
      end
    when :rpfilter
      if rule.match(Regexp.new("#{value}\\s--"))
        # Since the values are their own flags we can simply look for them directly
        value_regex = Regexp.new("(?:\s--(invert|validmark|loose|accept-local))")
        key_value = rule.scan(value_regex)
        return_value = []
        key_value.each do |val|
          return_value << val[0]
        end
        rule_hash[key] = return_value[0] if return_value.length == 1
        rule_hash[key] = return_value if return_value.length > 1
      end
    when :proto, :source, :destination, :iniface, :outiface, :physdev_in, :physdev_out, :src_range, :dst_range,
          :tcp_option, :uid, :gid, :mac_source, :pkttype, :ctproto, :ctorigsrc, :ctorigdst, :ctreplsrc, :ctrepldst,
          :ctorigsrcport, :ctorigdstport, :ctreplsrcport, :ctrepldstport, :ctexpire, :cgroup, :hop_limit
      # Values where negation is prior to the flag
      # First find if flag is present, add a space to ensure accuracy with the more simplistic flags; i.e. `-i`
      if rule.match(Regexp.new("#{value}\\s"))
        value_regex = Regexp.new("(?:(!)\\s)?#{value}\\s(\\S+)")
        key_value = rule.scan(value_regex)[0]
        # If it has, combine the retrieved '!' with the actual value to make one string
        key_value[1] = [key_value[0], key_value[1]].join(' ') unless key_value[0].nil?
        rule_hash[key] = key_value[1] if key_value
      end
    else # stat_mode, stat_every, stat_packet, stat_probability, socket, ipsec_dir, ipsec_policy, :ctdir,
      # :limit, :burst, :length, :rseconds, :rhitcount, :rname, :mask, :string_algo, :string_from, :string_to,
      # :jump, :goto, :clusterip_hashmode, :clusterip_clustermac, :clusterip_total_nodes, :clusterip_local_node,
      # :clusterip_hash_init, :queue_num, :nflog_group, :nflog_range, :nflog_size, :nflog_threshold,
      # :gateway, :set_mss, :set_dscp, :set_dscp_class, :todest, :tosource, :toports, :to, :log_level,
      # :reject, :set_mark, :connlimit_upto, :connlimit_above, :connlimit_mask, :time_start, :time_stop, :date_start,
      # :date_stop, :src_cc, :dst_cc, :hashlimit_upto, :hashlimit_above, :hashlimit_name, :hashlimit_burst, :hashlimit_mode,
      # :hashlimit_srcmask, :hashlimit_dstmask, :hashlimit_htable_size, :hashlimit_htable_max, :hashlimit_htable_expire,
      # :hashlimit_htable_gcinterval, :zone, :helper, :condition
      # Default return, retrieve first complete block following the key value
      # First find if flag is present, add a space to ensure accuracy with the more simplistic flags; i.e. `-j`, `--to`
      if rule.match(Regexp.new("#{value}\\s"))
        value_regex = Regexp.new("#{value}(?:\\s(!)\\s|\\s{1,2})(\\S+)")
        key_value = rule.scan(value_regex)[0]
        # If it has, combine the retrieved '!' with the actual value to make one string
        key_value[1] = [key_value[0], key_value[1]].join(' ') unless key_value[0].nil?
        # If value is meant to return as an integer/float ensure it does
        int_attr = [:stat_every, :stat_packet, :burst, :rseconds, :rhitcount, :string_from, :string_to, :clusterip_total_nodes,
                    :clusterip_local_nodes, :nflog_group, :nflog_range, :nflog_size, :nflog_threshold, :set_mss, :connlimit_upto,
                    :connlimit_above, :connlimit_mask, :hashlimit_burst, :hashlimit_srcmask, :hashlimit_dstmask, :hashlimit_htable_size,
                    :hashlimit_htable_max, :hashlimit_htable_expire, :hashlimit_htable_gcinterval, :zone]
        key_value[1] = key_value[1].to_i if int_attr.include?(key)
        if key == :stat_probability && key_value[1].include?('.')
          key_value[1] = key_value[1].to_f
        elsif key == :stat_probability
          key_value[1] = key_value[1].to_i
        end

        rule_hash[key] = key_value[1] if key_value
      end
    end
  end
  rule_hash
end

.rule_to_name(_context, rule, table_name, protocol) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Simplified version of ‘self.rules_to_hash’ meant to return name, chain and table only



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# File 'lib/puppet/provider/firewall/firewall.rb', line 491

def self.rule_to_name(_context, rule, table_name, protocol)
  rule_hash = {}
  rule_hash[:ensure] = 'present'
  rule_hash[:table] = table_name
  rule_hash[:protocol] = protocol

  name_regex = Regexp.new("#{$resource_map[:name]}\\s(?:\"([^\"]*)|([^\"\\s]*))")
  name_value = rule.scan(name_regex)[0]
  # Combine the returned values and remove and trailing or leading whitespace
  rule_hash[:name] = [name_value[0], name_value[1]].join(' ').strip if name_value

  chain_regex = Regexp.new("#{$resource_map[:chain]}\\s(\\S+)")
  rule_hash[:chain] = rule.scan(chain_regex)[0][0]

  rule_hash
end

.validate_get(_context, rules) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Verify that the information being retrieved is correct

Raises:

  • (ArgumentError) 


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# File 'lib/puppet/provider/firewall/firewall.rb', line 691

def self.validate_get(_context, rules)
  # Verify that names are unique
  names = []
  rules.each do |rule|
    names << rule[:name]
  end
  raise ArgumentError, 'Duplicate names have been found within your Firewalls. This prevents the module from working correctly and must be manually resolved.' if names.length != names.uniq.length
  # Verify that the current order of the retrieved puppet rules is correct
end

.validate_input(_is, should) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Verify that the information being set is correct

Raises:

  • (ArgumentError) 


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# File 'lib/puppet/provider/firewall/firewall.rb', line 740

def self.validate_input(_is, should)
  # Verify that name does not start with 9000-9999, this range has been reserved. Ignore check when deleting the rule
  raise ArgumentError, 'Rule name cannot start with 9000-9999, as this range is reserved for unmanaged rules.' if should[:name].match($unmanaged_rule_regex) && should[:ensure].to_s == 'present'
  # `isfragment` can only be set when `proto` is `tcp`
  raise ArgumentError, '`proto` must be set to `tcp` for `isfragment` to be true.' if should[:isfragment] && should[:proto] != 'tcp'
  # `stat_mode` must be set to `nth` for `stat_every` and `stat_packet` to be set
  raise ArgumentError, '`stat_mode` must be set to `nth` for `stat_every` to be set.' if should[:stat_every] && should[:stat_mode] != 'nth'
  raise ArgumentError, '`stat_mode` must be set to `nth` for `stat_packet` to be set.' if should[:stat_packet] && should[:stat_mode] != 'nth'
  # `stat_mode` must be set to `random` for `stat_probability` to be set
  raise ArgumentError, '`stat_mode` must be set to `random` for `stat_probability` to be set.' if should[:stat_probability] && should[:stat_mode] != 'random'

  # Verify that if dport/sport/state/ctstate/ctstatus is passed as an array, that any negation includes either the first value or al values
  [:dport, :sport, :state, :ctstate, :ctstatus].each do |key|
    next unless should[key].is_a?(Array)

    negated_values = 0
    should[key].each do |value|
      negated_values += 1 if %r{^!\s}.match?(value.to_s)
    end
    next unless (negated_values == 1 && !should[key][0].to_s.match(%r{^!\s})) ||
                (negated_values >= 2 && negated_values != should[key].length)

    raise ArgumentError,
          "When negating a `#{key}` array, you must negate either the first given value only or all the given values."
  end
  raise ArgumentError, 'Value `any` is not valid. This behaviour should be achieved by omitting or undefining the ICMP parameter.' if should[:icmp] && should[:icmp] == 'any'
  raise ArgumentError, '`burst` cannot be set without `limit`.' if should[:burst] && !(should[:limit])

  # Verify that a correct range has been passed for `length`
  if should[:length]
    match = should[:length].to_s.match('^([0-9]+)(?::)?([0-9]+)?$')
    low = match[1].to_i
    high = match[2].to_i if match[2]
    raise ArgumentError, '`length` values must be between 0 and 65535' if (low.negative? || low > 65_535) || (!high.nil? && (high.negative? || high > 65_535 || high < low))
  end
  # Recent module
  raise ArgumentError, '`recent` must be set to `update` or `rcheck` for `rseconds` to be set.' if should[:rseconds] && (should[:recent] != 'update' && should[:recent] != 'rcheck')
  raise ArgumentError, '`rseconds` must be set for `reap` to be set.' if should[:reap] && !should[:rseconds]
  raise ArgumentError, '`recent` must be set to `update` or `rcheck` for `rhitcount` to be set.' if should[:rhitcount] && (should[:recent] != 'update' && should[:recent] != 'rcheck')
  raise ArgumentError, '`recent` must be set to `update` or `rcheck` for `rttl` to be set.' if should[:rttl] && (should[:recent] != 'update' && should[:recent] != 'rcheck')
  raise ArgumentError, '`recent` must be set for `rname` to be set.' if should[:rname] && !should[:recent]
  raise ArgumentError, '`recent` must be set for `rsource` to be set.' if should[:rsource] && !should[:recent]
  raise ArgumentError, '`recent` must be set for `rdest` to be set.' if should[:rdest] && !should[:recent]
  raise ArgumentError, '`rdest` and `rsource` are mutually exclusive, only one may be set at a time.' if should[:rsource] && should[:rdest]
  # String module
  raise ArgumentError, '`string_algo` must be set for `string` or `string_hex` to be set.' if (should[:string] || should[:string_hex]) && !(should[:string_algo])
  # NFQUEUE
  raise ArgumentError, '`queue_num`` must be between 0 and 65535' if should[:queue_num] && (should[:queue_num].to_i > 65_535 || should[:queue_num].to_i.negative?)
  # Jump
  # `2^16-1` is equal to `65_535`
  raise ArgumentError, '`nflog_group` must be between 0 and 2^16-1' if should[:nflog_group] && (should[:nflog_group].to_i > 65_535 || should[:queue_num].to_i.negative?)
  raise ArgumentError, 'When setting `jump => TEE`, the gateway property is required' if should[:jump] == 'TEE' && !should[:gateway]
  raise ArgumentError, 'When setting `jump => TCPMSS`, the `set_mss` or `clamp_mss_to_pmtu` property is required' if should[:jump] == 'TCPMSS' && !(should[:set_mss] || should[:clamp_mss_to_pmtu])
  raise ArgumentError, 'When setting `jump => DSCP`, the `set_dscp` or `set_dscp_class` property is required' if should[:jump] == 'DSCP' && !(should[:set_dscp] || should[:set_dscp_class])
  raise ArgumentError, 'Parameter `jump => DNAT` only applies to `table => nat`' if should[:jump] == 'DNAT' && should[:table] != 'nat'
  raise ArgumentError, 'Parameter `jump => DNAT` must have `todest` parameter' if (should[:jump] == 'DNAT' && !should[:todest]) || (should[:jump] != 'DNAT' && should[:todest])
  raise ArgumentError, 'Parameter `jump => SNAT` only applies to `table => nat`' if should[:jump] == 'SNAT' && should[:table] != 'nat'
  raise ArgumentError, 'Parameter `jump => SNAT` must have `tosource` parameter' if (should[:jump] == 'SNAT' && !should[:tosource]) || (should[:jump] != 'SNAT' && should[:tosource])
  raise ArgumentError, 'Parameter `checksum_fill` requires `jump => CHECKSUM` and `table => mangle`' if should[:checksum_fill] && !(should[:jump] == 'CHECKSUM' && should[:table] == 'mangle')

  [:log_prefix, :log_level, :log_uid, :log_tcp_sequence, :log_tcp_options, :log_ip_options].each do |log|
    raise ArgumentError, "Parameter `#{log}` requires `jump => LOG`" if should[log] && should[:jump] != 'LOG'
  end
  raise ArgumentError, 'Parameter `jump => CT` only applies to `table => raw`' if should[:jump] == 'CT' && should[:table] != 'raw'
  raise ArgumentError, 'Parameter `zone` requires `jump => CT`' if should[:zone] && should[:jump] != 'CT'
  raise ArgumentError, 'Parameter `helper` requires `jump => CT`'  if should[:helper] && should[:jump] != 'CT'
  raise ArgumentError, 'Parameter `notrack` requires `jump => CT`' if should[:notrack] && should[:jump] != 'CT'
  # Connlimit
  raise ArgumentError, 'Parameter `connlimit_mask` requires either `connlimit_upto` or `connlimit_above`' if should[:connlimit_mask] && !(should[:connlimit_upto] || should[:connlimit_above])

  # Hashlimit
  [:hashlimit_upto, :hashlimit_above, :hashlimit_name, :hashlimit_burst, :hashlimit_mode, :hashlimit_srcmask, :hashlimit_dstmask,
   :hashlimit_htable_size, :hashlimit_htable_max, :hashlimit_htable_expire, :hashlimit_htable_gcinterval].each do |hash|
    next unless should[hash] && (!should[:hashlimit_name] || !(should[:hashlimit_upto] || should[:hashlimit_above]))

    raise ArgumentError, 'Parameter `hashlimit_name` and either `hashlimit_upto` or `hashlimit_above` are required when setting any `hashlimit` attribute.'
  end
  raise ArgumentError, '`hashlimit_upto` and `hashlimit_above` are mutually exclusive, only one may be set at a time.' if should[:hashlimit_upto] && should[:hashlimit_above]

  # Protocol
  ipv4_only = [:clusterip_new, :clusterip_hashmode, :clusterip_clustermac, :clusterip_total_nodes, :clusterip_local_node, :clusterip_hash_init]
  ipv4_only.each do |ipv4|
    raise ArgumentError, "Parameter `#{ipv4}` is specific to the `IPv4` protocol" if should[ipv4] && !(should[:protocol] == 'IPv4' || should[:protocol] == 'iptables')
  end
  ipv6_only = [:hop_limit, :ishasmorefrags, :islastfrag, :isfirstfrag]
  ipv6_only.each do |ipv6|
    raise ArgumentError, "Parameter `#{ipv6}` is specific to the `IPv6` protocol" if should[ipv6] && !(should[:protocol] == 'IPv6' || should[:protocol] == 'ip6tables')
  end
  ## Array elements must be unique
  [:dst_type, :src_type].each do |key|
    next unless should[key].is_a?(Array)
    raise ArgumentError, "`#{key}` elements must be unique" if should[key].map { |type| type.to_s.gsub(%r{--limit-iface-(in|out)}, '') }.uniq.length != should[key].length
  end
  # Log prefix size is limited
  raise ArgumentError, 'Parameter `nflog_prefix`` must be less than 64 characters' if should[:nflog_prefix] && should[:nflog_prefix].length > 64

  [:dst_range, :src_range].each do |key|
    next unless should[key]

    matches = %r{^([^\-/]+)-([^\-/]+)$}.match(should[key])
    raise(ArgumentError, 'The IP range must be in `IP1-IP2` format.') unless matches

    [matches[1], matches[2]].each do |addr|
      begin # rubocop:disable Style/RedundantBegin
        PuppetX::Firewall::Utility.host_to_ip(addr, should[:protocol])
      rescue StandardError
        raise(ArgumentError, "Invalid IP address `#{addr}` in range `#{should[key]}`")
      end
    end
  end
end

Instance Method Details

#create(context, name, should) ⇒ Object 



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# File 'lib/puppet/provider/firewall/firewall.rb', line 298

def create(context, name, should)
  context.notice("Creating Rule '#{name}' with #{should.inspect}")
  position = Puppet::Provider::Firewall::Firewall.insert_order(context, name, should[:chain], should[:table], should[:protocol])
  arguments = Puppet::Provider::Firewall::Firewall.hash_to_rule(context, name, should)
  Puppet::Provider.execute([$base_command[should[:protocol]], should[:table], $rule_create_command, should[:chain], position, arguments].join(' '))
  PuppetX::Firewall::Utility.persist_iptables(context, name, should[:protocol])
end

#delete(context, name, is) ⇒ Object 



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# File 'lib/puppet/provider/firewall/firewall.rb', line 314

def delete(context, name, is)
  context.notice("Deleting Rule '#{name}'")
  # When deleting we use the retrieved iptables-save append command as a base
  # We do this to ensure accuracy when removing non-standard (i.e. uncommented) rules via the firewallchain purge function
  arguments = is[:line].gsub(%r{^-A}, $rule_delete_command)
  Puppet::Provider.execute([$base_command[is[:protocol]], is[:table], arguments].join(' '))
  PuppetX::Firewall::Utility.persist_iptables(context, name, is[:protocol])
end

#get(context) ⇒ Object

PUBLIC METHODS ######



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# File 'lib/puppet/provider/firewall/firewall.rb', line 259

def get(context)
  # Call the private method which returns the rules
  # The method is seperated out in this way as it is re-used later in the code
  rules = Puppet::Provider::Firewall::Firewall.get_rules(context, false)
  # Verify the returned data
  Puppet::Provider::Firewall::Firewall.validate_get(context, rules)
  # Return array
  rules
end

#insync?(context, _name, property_name, is_hash, should_hash) ⇒ Boolean

Custom insync method Needed for uid and gid

Returns:

  • (Boolean) 


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# File 'lib/puppet/provider/firewall/firewall.rb', line 325

def insync?(context, _name, property_name, is_hash, should_hash)
  context.debug("Checking whether '#{property_name}' is out of sync")

  # If either value is nil, no custom logic is required
  return nil if is_hash[property_name].nil? || should_hash[property_name].nil?

  case property_name
  when :protocol
    is = is_hash[property_name]
    should = should_hash[property_name]

    # Ensure the should value accurately matches the is
    should = 'IPv4' if should == 'iptables'
    should = 'IPv6' if should == 'ip6tables'

    is == should
  when :source, :destination
    # Ensure source/destination has it's valid mask before you compare it
    is_hash[property_name] == PuppetX::Firewall::Utility.host_to_mask(should_hash[property_name], should_hash[:protocol])
  when :tcp_option, :ctproto, :hop_limit
    # Ensure that the values are compared as strings
    is_hash[property_name] == should_hash[property_name].to_s
  when :tcp_flags
    # Custom logic to account for `ALL` being returned as `FIN,SYN,RST,PSH,ACK,URG`
    is = is_hash[property_name].split
    should = should_hash[property_name].split

    is = is.map { |x| (x == 'FIN,SYN,RST,PSH,ACK,URG') ? 'ALL' : x }
    should = should.map { |x| (x == 'FIN,SYN,RST,PSH,ACK,URG') ? 'ALL' : x }

    is.join(' ') == should.join(' ')
  when :uid, :gid
    require 'etc'
    # The following code allow us to take into consideration unix mappings
    # between string usernames and UIDs (integers). We also need to ignore
    # spaces as they are irrelevant with respect to rule sync.

    # Remove whitespace
    is = is_hash[property_name].to_s.gsub(%r{\s+}, '')
    should = should_hash[property_name].to_s.gsub(%r{\s+}, '')

    # Keep track of negation, but remove the '!'
    is_negate = ''
    should_negate = ''
    if is.start_with?('!')
      is = is.gsub(%r{^!}, '')
      is_negate = '!'
    end
    if should.start_with?('!')
      should = should.gsub(%r{^!}, '')
      should_negate = '!'
    end

    # If 'is' or 'should' contain anything other than digits or digit range,
    # we assume that we have to do a lookup to convert to UID
    is = Etc.getpwnam(is).uid unless is[%r{[0-9]+(-[0-9]+)?}] == is
    should = Etc.getpwnam(should).uid unless should[%r{[0-9]+(-[0-9]+)?}] == should

    "#{is_negate}#{is}" == "#{should_negate}#{should}"
  when :mac_source, :jump
    # Value of mac_source/jump may be downcased or upcased when returned depending on the OS
    is_hash[property_name].casecmp(should_hash[property_name]).zero?
  when :icmp
    # Ensure that the values are compared to each other as icmp code numbers
    is = PuppetX::Firewall::Utility.icmp_name_to_number(is_hash[property_name], is_hash[:protocol])
    should = PuppetX::Firewall::Utility.icmp_name_to_number(should_hash[property_name], should_hash[:protocol])
    is == should
  when :log_level
    # Ensure that the values are compared to each other as log level numbers
    is = PuppetX::Firewall::Utility.log_level_name_to_number(is_hash[property_name])
    should = PuppetX::Firewall::Utility.log_level_name_to_number(should_hash[property_name])
    is == should
  when :set_mark
    # Ensure that the values are compared to eachother in hexidecimal format
    is = PuppetX::Firewall::Utility.mark_mask_to_hex(is_hash[property_name])
    should = PuppetX::Firewall::Utility.mark_mask_to_hex(should_hash[property_name])
    is == should
  when :match_mark, :connmark
    # Ensure that the values are compared to eachother in hexidecimal format
    is = PuppetX::Firewall::Utility.mark_to_hex(is_hash[property_name])
    should = PuppetX::Firewall::Utility.mark_to_hex(should_hash[property_name])
    is == should
  when :time_start, :time_stop
    # Ensure the values are compared in full `00:00:00` format
    is = is_hash[property_name]
    should = should_hash[property_name]

    should = "0#{should}" if %r{^([0-9]):}.match?(should)
    should = "#{should}:00" if %r{^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$}.match?(should)

    is == should
  when :dport, :sport, :state, :ctstate, :ctstatus
    is = is_hash[property_name]
    should = should_hash[property_name]

    # Unique logic is only needed when both values are arrays
    return nil unless is.is_a?(Array) && should.is_a?(Array)

    # Ensure values are sorted
    # Ensure any negation includes only the first value
    is_negated = true if %r{^!\s}.match?(is[0].to_s)
    is.each_with_index do |_value, _index|
      is = is.map { |value| value.to_s.tr('! ', '') }.sort
    end
    is[0] = ['!', is[0]].join(' ') if is_negated

    should_negated = true if %r{^!\s}.match?(should[0].to_s)
    should.each_with_index do |_value, _index|
      should = should.map { |value| value.to_s.tr('! ', '') }.sort
      # Port range can be passed as `-` but will always be set/returned as `:`
      ports = [:dport, :sport]
      should = should.map { |value| value.to_s.tr('-', ':') }.sort if ports.include?(property_name)
    end
    should[0] = ['!', should[0]].join(' ') if should_negated

    is == should
  when :string_hex
    # Compare the values with any whitespace removed
    is = is_hash[property_name].to_s.gsub(%r{\s+}, '')
    should = should_hash[property_name].to_s.gsub(%r{\s+}, '')

    is == should
  else
    # Ensure that if both values are arrays, that they are sorted prior to comparison
    return nil unless is_hash[property_name].is_a?(Array) && should_hash[property_name].is_a?(Array)

    is_hash[property_name].sort == should_hash[property_name].sort
  end
end

#set(context, changes) ⇒ Object 



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# File 'lib/puppet/provider/firewall/firewall.rb', line 269

def set(context, changes)
  changes.each do |name, change|
    is = change[:is]
    should = change[:should]

    is = PuppetX::Firewall::Utility.create_absent(:name, name) if is.nil?
    should = PuppetX::Firewall::Utility.create_absent(:name, name) if should.nil?

    # Run static verification against both sets of values
    Puppet::Provider::Firewall::Firewall.validate_input(is, should)
    # Process the intended values so that they are inputed as they should be
    should = Puppet::Provider::Firewall::Firewall.process_input(should)

    if is[:ensure].to_s == 'absent' && should[:ensure].to_s == 'present'
      context.creating(name) do
        create(context, name, should)
      end
    elsif is[:ensure].to_s == 'present' && should[:ensure].to_s == 'absent'
      context.deleting(name) do
        delete(context, name, is)
      end
    elsif is[:ensure].to_s == 'present'
      context.updating(name) do
        update(context, name, should)
      end
    end
  end
end

#update(context, name, should) ⇒ Object 



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# File 'lib/puppet/provider/firewall/firewall.rb', line 306

def update(context, name, should)
  context.notice("Updating Rule '#{name}' with #{should.inspect}")
  position = Puppet::Provider::Firewall::Firewall.insert_order(context, name, should[:chain], should[:table], should[:protocol])
  arguments = Puppet::Provider::Firewall::Firewall.hash_to_rule(context, name, should)
  Puppet::Provider.execute([$base_command[should[:protocol]], should[:table], $rule_update_command, should[:chain], position, arguments].join(' '))
  PuppetX::Firewall::Utility.persist_iptables(context, name, should[:protocol])
end