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audit.yml
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audit.yml
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---
# Some documentation available at https://github.com/pyllyukko/harden.sh/wiki/audit
- name: Install auditing
become: true
when: ansible_distribution == "Debian" or ansible_distribution == "Kali" or ansible_distribution == "Slackware" or ansible_os_family == "RedHat"
block:
- name: Install necessary software for auditing (Debian)
ansible.builtin.apt:
name: ['auditd', 'libcap-ng-utils', 'make']
update_cache: true
when: ansible_distribution == "Debian" or ansible_distribution == "Kali"
tags:
- packages
- debian
- name: mkdir /etc/audit/rules.d
ansible.builtin.file:
path: /etc/audit/rules.d
state: directory
owner: root
group: root
mode: '0700'
- name: Copy audit rules
ansible.builtin.get_url:
url: https://raw.githubusercontent.com/linux-audit/audit-userspace/master/rules/{{ item }}
dest: /etc/audit/rules.d/{{ item }}
owner: root
group: root
mode: '0600'
with_items:
- 10-base-config.rules
- 11-loginuid.rules
- 12-ignore-error.rules
- 20-dont-audit.rules
- 30-stig.rules
- 42-injection.rules
- 43-module-load.rules
- 99-finalize.rules
- name: Fix 10-base-config.rules for CentOS 7
ansible.builtin.replace:
path: /etc/audit/rules.d/10-base-config.rules
regexp: "^(--backlog_wait_time [0-9]+)$"
replace: '#\1'
when: (ansible_distribution == "CentOS" and ansible_distribution_major_version == "7") or (ansible_distribution == "Slackware" and ansible_distribution_version == "14.2") # noqa yaml[line-length]
tags: centos
#- name: Remove 11-loginuid.rules for Slackware 14.2
# ansible.builtin.file:
# path: /etc/audit/rules.d/11-loginuid.rules
# state: absent
# when: ansible_distribution == "Slackware" and ansible_distribution_version == "14.2"
# tags:
# - slackware
- name: Modify 20-dont-audit.rules
block:
- name: Uncomment few exclusions in 20-dont-audit.rules
ansible.builtin.replace:
path: /etc/audit/rules.d/20-dont-audit.rules
regexp: "^#?({{ item }})$"
replace: '\1'
with_items:
- -a always,exclude -F msgtype=CRYPTO_KEY_USER
# https://listman.redhat.com/archives/linux-audit/2009-November/006296.html
- -a never,user -F subj_type=crond_t
- name: Exclude some noisy and irrelevant events
ansible.builtin.blockinfile:
path: /etc/audit/rules.d/20-dont-audit.rules
block: |
-a always,exclude -F msgtype=CRYPTO_SESSION
-a never,exit -F arch=b64 -S adjtimex -F auid=unset -F uid=ntp -F subj_type=ntpd_t
- name: Disable noisy STIG rules
ansible.builtin.replace:
path: /etc/audit/rules.d/30-stig.rules
regexp: "^(-.+-F key={{ item }})$"
replace: '#\1'
with_items:
- perm_mod
- delete
- name: Create 31-privileged.rules
block:
- name: Create temp dir
ansible.builtin.tempfile:
state: directory
suffix: temp
register: tempdir_1
- name: Copy Makefile
ansible.builtin.copy:
src: "{{ playbook_dir }}/Makefile"
dest: "{{ tempdir_1.path }}/"
mode: '0600'
- name: Generate 31-privileged.rules
community.general.make:
chdir: "{{ tempdir_1.path }}"
target: /etc/audit/rules.d/31-privileged.rules
- name: Remove temp dir
ansible.builtin.file:
path: "{{ tempdir_1.path }}"
state: absent
when: tempdir_1.path is defined
- name: Remove unnecessary file
ansible.builtin.file:
state: absent
path: /etc/audit/rules.d/audit.rules
- name: Create few custom audit rules
ansible.builtin.assemble:
remote_src: false
src: "{{ playbook_dir }}/newconfs/rules.d"
dest: /etc/audit/rules.d/40-local.rules
owner: root
group: root
mode: '0600'
- name: Make the audit configuration immutable
ansible.builtin.replace:
path: /etc/audit/rules.d/99-finalize.rules
regexp: "^#?(-e 2)$"
replace: '\1'
- name: Load the audit rules
ansible.builtin.command: /sbin/augenrules --load
register: result
changed_when: '"/sbin/augenrules: No change" not in result.stdout'
tags: configuration
- name: Configure auditd.conf
ansible.builtin.replace:
path: /etc/audit/auditd.conf
regexp: '^({{ item.key }}) = .*$'
replace: '\1 = {{ item.value }}'
with_dict:
space_left_action: email
action_mail_acct: root
max_log_file_action: keep_logs
tags: configuration
- name: Start & enable auditing
ansible.builtin.service:
name: auditd
state: started
enabled: true
when: ansible_distribution != "Slackware"
tags:
- services
- configuration
- name: Configure GRUB for auditing
ansible.builtin.replace:
path: /etc/default/grub
regexp: '^(GRUB_CMDLINE_LINUX="(?!.*\b{{ item }}\b).*)"$'
replace: '\1 {{ item }}"'
with_items:
- audit=1
- audit_backlog_limit=8192
when: ansible_distribution == "Debian" or ansible_distribution == "Kali" or ansible_os_family == "RedHat"
tags: configuration
notify: "Run update-grub"
register: result
failed_when:
- result.failed == true
- '"does not exist !" not in result.msg'
- name: Add audit=1 to /boot/cmdline.txt (Raspberry Pi OS)
ansible.builtin.replace:
path: /boot/cmdline.txt
regexp: '^(.(?!.*\baudit=1\b).*)$'
replace: '\1 audit=1'
when: ansible_distribution == "Debian"
tags:
- debian
- configuration
register: result
failed_when:
- result.failed == true
- '"does not exist !" not in result.msg'
# AUDISP-REMOTE(8): "you should edit auditd.conf to set the name_format to something meaningful and the log_format to enriched
#- name: Configure auditd.conf for audisp
# ansible.builtin.replace:
# path: /etc/audit/auditd.conf
# regexp: '^({{ item.key }}) = .*$'
# replace: '\1 = {{ item.value }}'
# with_dict:
# log_format: ENRICHED
# name_format: HOSTNAME