auditd

Use the auditd 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.


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 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.