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132 lines
3.3 KiB
Text
132 lines
3.3 KiB
Text
---
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title: About the auditd_rules Resource
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---
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# auditd_rules
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Use the `auditd_rules` 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. This resource uses `auditctl` to query the run-time `auditd` rules setup, which may be different from `audit.rules`.
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## Syntax
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An `auditd_rules` resource block declares one (or more) rules to be tested, and then what that rule should do. The syntax depends on the version of `audit`:
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For `audit` >= 2.3:
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describe auditd_rules do
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its('lines') { should contain_match(rule) }
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end
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For `audit` < 2.3:
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describe audit_daemon_rules do
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its("LIST_RULES") {
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rule
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}
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end
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For example:
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describe auditd_rules do
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its('LIST_RULES') { should eq [
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'exit,always syscall=rmdir,unlink',
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'exit,always auid=1001 (0x3e9) syscall=open',
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'exit,always watch=/etc/group perm=wa',
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'exit,always watch=/etc/passwd perm=wa',
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'exit,always watch=/etc/shadow perm=wa',
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'exit,always watch=/etc/sudoers perm=wa',
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'exit,always watch=/etc/secret_directory perm=r',
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] }
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end
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or test that individual rules are defined:
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describe auditd_rules do
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its('LIST_RULES') {
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should contain_match(/^exit,always watch=\/etc\/group perm=wa key=identity/)
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}
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its('LIST_RULES') {
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should contain_match(/^exit,always watch=\/etc\/passwd perm=wa key=identity/)
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}
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its('LIST_RULES') {
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should contain_match(/^exit,always watch=\/etc\/gshadow perm=wa key=identity/)
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}
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its('LIST_RULES') {
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should contain_match(/^exit,always watch=\/etc\/shadow perm=wa key=identity/)
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}
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its('LIST_RULES') {
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should contain_match(/^exit,always watch=\/etc\/security\/opasswd perm=wa key=identity/)
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}
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end
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where each test must declare one (or more) rules to be tested.
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## Matchers
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This InSpec audit resource has the following matchers:
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### be
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<%= partial "/shared/matcher_be" %>
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### cmp
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<%= partial "/shared/matcher_cmp" %>
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### eq
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<%= partial "/shared/matcher_eq" %>
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### include
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<%= partial "/shared/matcher_include" %>
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### match
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<%= partial "/shared/matcher_match" %>
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## Examples
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The following examples show how to use this InSpec audit resource.
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### Test if a rule contains a matching element that is identified by a regular expression
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For `audit` >= 2.3:
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describe auditd_rules do
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its('lines') { should contain_match(%r{-w /etc/ssh/sshd_config/}) }
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end
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For `audit` < 2.3:
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describe audit_daemon_rules do
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its("LIST_RULES") {
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should contain_match(/^exit,always arch=.*\
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key=time-change\
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syscall=adjtimex,settimeofday/)
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}
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end
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### Query the audit daemon status
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describe auditd_rules.status('backlog') do
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it { should cmp 0 }
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end
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### Query properties of rules targeting specific syscalls or files
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describe auditd_rules.syscall('open').action do
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it { should eq(['always']) }
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end
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describe auditd_rules.key('sshd_config') do
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its('permissions') { should contain_match(/x/) }
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end
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Filters may be chained. For example:
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describe auditd_rules.syscall('open').action('always').list do
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it { should eq(['exit']) }
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end
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