mirror of
https://github.com/inspec/inspec
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80 lines
2.7 KiB
Ruby
80 lines
2.7 KiB
Ruby
require "inspec/resources/command"
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# Usage:
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# describe iptables do
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# it { should have_rule('-P INPUT ACCEPT') }
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# end
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#
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# The following serverspec sytax is not implemented:
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# describe iptables do
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# it { should have_rule('-P INPUT ACCEPT').with_table('mangle').with_chain('INPUT') }
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# end
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# Please use the new sytax:
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# describe iptables(table:'mangle', chain: 'input') do
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# it { should have_rule('-P INPUT ACCEPT') }
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# end
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#
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# Note: Docker containers normally do not have iptables installed
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#
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# @see http://ipset.netfilter.org/iptables.man.html
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# @see http://ipset.netfilter.org/iptables.man.html
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# @see https://www.frozentux.net/iptables-tutorial/iptables-tutorial.html
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module Inspec::Resources
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class IpTables < Inspec.resource(1)
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name "iptables"
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supports platform: "linux"
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desc "Use the iptables InSpec audit resource to test rules that are defined in iptables, which maintains tables of IP packet filtering rules. There may be more than one table. Each table contains one (or more) chains (both built-in and custom). A chain is a list of rules that match packets. When the rule matches, the rule defines what target to assign to the packet."
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example <<~EXAMPLE
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describe iptables do
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it { should have_rule('-P INPUT ACCEPT') }
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end
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EXAMPLE
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def initialize(params = {})
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@table = params[:table]
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@chain = params[:chain]
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# we're done if we are on linux
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return if inspec.os.linux?
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# ensures, all calls are aborted for non-supported os
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@iptables_cache = []
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skip_resource "The `iptables` resource is not supported on your OS yet."
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end
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def has_rule?(rule = nil, _table = nil, _chain = nil)
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# checks if the rule is part of the ruleset
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# for now, we expect an exact match
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retrieve_rules.any? { |line| line.casecmp(rule) == 0 }
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end
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def retrieve_rules
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return @iptables_cache if defined?(@iptables_cache)
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# construct iptables command to read all rules
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bin = find_iptables_or_error
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table_cmd = "-t #{@table}" if @table
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iptables_cmd = format("%s %s -S %s", bin, table_cmd, @chain).strip
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cmd = inspec.command(iptables_cmd)
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return [] if cmd.exit_status.to_i != 0
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# split rules, returns array or rules
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@iptables_cache = cmd.stdout.split("\n").map(&:strip)
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end
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def to_s
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format("Iptables %s %s", @table && "table: #{@table}", @chain && "chain: #{@chain}").strip
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end
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private
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def find_iptables_or_error
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%w{/usr/sbin/iptables /sbin/iptables iptables}.each do |cmd|
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return cmd if inspec.command(cmd).exist?
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end
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raise Inspec::Exceptions::ResourceFailed, "Could not find `iptables`"
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end
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end
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end
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