mirror of
https://github.com/inspec/inspec
synced 2024-11-23 21:23:29 +00:00
64 lines
2.1 KiB
Text
64 lines
2.1 KiB
Text
---
|
|
title: About the iptables Resource
|
|
platform: linux
|
|
---
|
|
|
|
# iptables
|
|
|
|
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.
|
|
|
|
<br>
|
|
|
|
## Syntax
|
|
|
|
A `iptables` resource block declares tests for rules in IP tables:
|
|
|
|
describe iptables(rule:'name', table:'name', chain: 'name') do
|
|
it { should have_rule('RULE') }
|
|
end
|
|
|
|
where
|
|
|
|
* `iptables()` may specify any combination of `rule`, `table`, or `chain`
|
|
* `rule:'name'` is the name of a rule that matches a set of packets
|
|
* `table:'name'` is the packet matching table against which the test is run
|
|
* `chain: 'name'` is the name of a user-defined chain or one of `ACCEPT`, `DROP`, `QUEUE`, or `RETURN`
|
|
* `have_rule('RULE')` tests that rule in the iptables list. This must match the entire line taken from `iptables -S CHAIN`.
|
|
|
|
<br>
|
|
|
|
## Examples
|
|
|
|
The following examples show how to use this InSpec audit resource.
|
|
|
|
### Test if the INPUT chain is in default ACCEPT mode
|
|
|
|
describe iptables do
|
|
it { should have_rule('-P INPUT ACCEPT') }
|
|
end
|
|
|
|
### Test if the INPUT chain from the mangle table is in ACCEPT mode
|
|
|
|
describe iptables(table:'mangle', chain: 'INPUT') do
|
|
it { should have_rule('-P INPUT ACCEPT') }
|
|
end
|
|
|
|
### Test if there is a rule allowing Postgres (5432/TCP) traffic
|
|
|
|
describe iptables do
|
|
it { should have_rule('-A INPUT -p tcp -m tcp -m multiport --dports 5432 -m comment --comment "postgres" -j ACCEPT') }
|
|
end
|
|
|
|
Note that the rule specification must exactly match what's in the output of `iptables -S INPUT`, which will depend on how you've built your rules.
|
|
|
|
<br>
|
|
|
|
## Matchers
|
|
|
|
For a full list of available matchers, please visit our [matchers page](https://www.inspec.io/docs/reference/matchers/).
|
|
|
|
### have_rule
|
|
|
|
The `have_rule` matcher tests the named rule against the information in the `iptables` file:
|
|
|
|
it { should have_rule('RULE') }
|