auditd resource

[edit on GitHub]

Use the auditd Chef InSpec audit resource to test the rules for logging that exist on the system. The audit.rules file is typically located under /etc/audit/ and contains the list of rules that define what is captured in log files. These rules are output using the auditctl -l command. This resource supports versions of audit >= 2.3.

Availability

Installation

This resource is distributed along with Chef InSpec itself. You can use it automatically.

Version

This resource first became available in v1.38.8 of InSpec.

Syntax

An auditd resource block declares one (or more) rules to be tested, and then what that rule should do:

describe auditd do
  its('lines') { should include %r(-w /etc/ssh/sshd_config) }
end

or test that multiple individual rules are defined:

describe auditd do
  its('lines') { should include %r(-a always,exit -F arch=.* -S init_module,delete_module -F key=modules) }
  its('lines') { should include %r(-a always,exit -F arch=.* -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=-1 -F key=.+) }
end

where each test must declare one (or more) rules to be tested.

Examples

The following examples show how to use this Chef InSpec audit resource.

Test if a rule contains a matching element that is identified by a regular expression

For audit >= 2.3:

describe auditd do
  its('lines') { should include %r(-a always,exit -F arch=.* -S chown.* -F auid>=1000 -F auid!=-1 -F key=perm_mod) }
end

Query the audit daemon status

describe auditd.status('backlog') do
  it { should cmp 0 }
end

Query properties of rules targeting specific syscalls or files - uniq is used to handle multiple rules for the same syscall with redundant field values

describe auditd.syscall('open') do
  its('action.uniq') { should eq ['always'] }
  its('list.uniq') { should eq ['exit'] }
end

describe auditd.file('/etc/sudoers') do
  its('permissions') { should include ['x'] }
end

The where accessor can be used to filter on fields. For example:

describe auditd.syscall('chown').where { arch == "b32" } do
  its('action') { should eq ['always'] }
  its('list') { should eq ['exit'] }
  its('exit') { should include ['-EACCES'] }
  its('exit') { should include ['-EPERM'] }
end

The key filter may be useful in evaluating rules with particular key values:

describe auditd.where { key == "privileged" } do
  its('permissions') { should include ['x'] }
end

Matchers

For a full list of available matchers, please visit our matchers page.