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---
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# Durcissement CIS Ubuntu 24.04 — journald, rsyslog, synchronisation temps (timesyncd/chrony)
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# (checks 35588, 35708, 35719 — 35591/35592/35720/35722 exceptions documentees ci-dessous)
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#
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# IMPORTANT — DECOUVERT EN TESTANT SUR pre-prod-uber :
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# Les checks Wazuh SCA correspondants exigent le reglage a la fois dans le fichier de BASE
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# et dans le repertoire conf.d (condition "all" combinant les deux emplacements) :
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# - 35708 (journald) : les 5 valeurs doivent apparaitre litteralement dans
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# /etc/systemd/journald.conf ET dans un fichier de /etc/systemd/journald.conf.d/*.conf
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# - 35719 (rsyslog) : $FileCreateMode doit apparaitre dans /etc/rsyslog.conf ET dans un
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# fichier de /etc/rsyslog.d/*.conf
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# - 35588 (timesyncd) est different : condition "any", donc NTP=/FallbackNTP= dans le
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# seul fichier de BASE /etc/systemd/timesyncd.conf suffit (le conf.d est deploye quand
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# meme, mais n'est pas strictement necessaire pour ce check precis)
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# Une premiere tentative "conf.d seul, base si absent" a echoue au rescan — deployer
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# systematiquement aux DEUX emplacements evite ce piege.
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#
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# CONTEXTE :
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# - Cette infra utilise systemd-timesyncd (chrony non installe). Les checks 35591/35592
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# (chrony actif / user _chrony) incluent tous deux la condition
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# `not systemd-timesyncd LoadState=loaded|ActiveState=active` dans un "condition: all" —
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# ils resteront donc TOUJOURS en echec tant que timesyncd est actif, quelle que soit la
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# config. Exception structurelle assumee (equivalent du choix CIS "2.3.2 timesyncd OU
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# 2.3.3 chrony", Wazuh evalue les deux blocs sans les rendre mutuellement exclusifs).
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# - 35710 (systemd-journal-upload) est "not applicable" tant que rsyslog est actif — non
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# traite ici.
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# - 35720 (rsyslog vers un host de log distant) est VOLONTAIREMENT NON TRAITE : decision
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# d'architecture (necessite un serveur cible + ouverture firewall), pas un simple reglage.
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# Wazuh joue deja ce role de centralisation via son propre protocole agent.
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# - 35722 (permissions /var/log) : wtmp/btmp/lastlog conservent group-write (groupe utmp)
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# car necessaire au bon fonctionnement de last/who/lastlog — plus strict casserait ces
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# commandes. Le reste de /var/log est corrige (apt logs, README, fichiers generiques).
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#
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# Aucune tache de ce playbook ne necessite de redemarrage serveur — tout s'applique via
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# `systemctl reload-or-restart` des services concernes.
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#
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# `serial: 1` + `any_errors_fatal` : un host a la fois, arret immediat si un host casse.
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#
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# Usage recommande : tester sur un host avant le rollout complet :
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# ansible-playbook hardening/playbook-journald-rsyslog-chrony.yml --limit pre-prod-uber
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- name: Durcissement journald/rsyslog/timesyncd (CIS Ubuntu 24.04)
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hosts: prod,pre-prod,bdd-redis-prod,replica-prod,infra,infra-runner,infra-utils,load-balancer
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become: true
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serial: 1
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any_errors_fatal: true
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tasks:
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# --- 6.1.1.3 Rotation des logs journald (base ET conf.d) ---
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- name: journald - fixer les 5 parametres dans le fichier de base
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ansible.builtin.lineinfile:
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path: /etc/systemd/journald.conf
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regexp: "{{ item.regexp }}"
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line: "{{ item.line }}"
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insertafter: '^\[Journal\]'
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loop:
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- { regexp: '^#?SystemMaxUse=', line: 'SystemMaxUse=1G' }
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- { regexp: '^#?SystemKeepFree=', line: 'SystemKeepFree=500M' }
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- { regexp: '^#?RuntimeMaxUse=', line: 'RuntimeMaxUse=200M' }
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- { regexp: '^#?RuntimeKeepFree=', line: 'RuntimeKeepFree=50M' }
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- { regexp: '^#?MaxFileSec=', line: 'MaxFileSec=1month' }
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register: journald_base
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- name: journald - deployer aussi en conf.d
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ansible.builtin.template:
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src: ../templates/60-journald.conf.j2
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dest: /etc/systemd/journald.conf.d/60-journald.conf
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owner: root
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group: root
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mode: "0644"
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register: journald_confd
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- name: journald - recharger si config changee
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ansible.builtin.command:
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cmd: systemctl reload-or-restart systemd-journald
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when: journald_base.changed or journald_confd.changed
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changed_when: true
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# --- 2.3.2.1 Serveur NTP explicite (timesyncd) — fichier de BASE obligatoire ---
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- name: Verifier si chrony est actif (dans ce cas ne pas toucher timesyncd)
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ansible.builtin.command:
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cmd: systemctl is-active chrony.service
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register: chrony_active
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changed_when: false
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failed_when: false
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- name: timesyncd - fixer NTP/FallbackNTP dans le fichier de base
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ansible.builtin.lineinfile:
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path: /etc/systemd/timesyncd.conf
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regexp: "{{ item.regexp }}"
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line: "{{ item.line }}"
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insertafter: '^\[Time\]'
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loop:
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- { regexp: '^#?NTP=', line: 'NTP=ntp.ubuntu.com' }
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- { regexp: '^#?FallbackNTP=', line: 'FallbackNTP=0.ubuntu.pool.ntp.org 1.ubuntu.pool.ntp.org 2.ubuntu.pool.ntp.org 3.ubuntu.pool.ntp.org' }
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when: chrony_active.stdout != "active"
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register: timesyncd_base
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- name: timesyncd - deployer aussi en conf.d
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ansible.builtin.template:
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src: ../templates/60-timesyncd.conf.j2
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dest: /etc/systemd/timesyncd.conf.d/60-timesyncd.conf
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owner: root
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group: root
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mode: "0644"
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when: chrony_active.stdout != "active"
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register: timesyncd_confd
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- name: timesyncd - recharger si config changee
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ansible.builtin.command:
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cmd: systemctl reload-or-restart systemd-timesyncd
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when: timesyncd_base is defined and (timesyncd_base.changed or timesyncd_confd.changed)
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changed_when: true
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# --- 6.1.3.4 Mode de creation des fichiers rsyslog (base ET conf.d) ---
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- name: rsyslog - fixer FileCreateMode dans le fichier de base
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ansible.builtin.lineinfile:
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path: /etc/rsyslog.conf
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regexp: '^\$FileCreateMode'
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line: '$FileCreateMode 0640'
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register: rsyslog_base
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- name: rsyslog - deployer aussi en conf.d
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ansible.builtin.template:
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src: ../templates/60-rsyslog-filecreatemode.conf.j2
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dest: /etc/rsyslog.d/60-rsyslog-filecreatemode.conf
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owner: root
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group: root
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mode: "0644"
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register: rsyslog_confd
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- name: rsyslog - recharger si config changee
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ansible.builtin.command:
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cmd: systemctl reload-or-restart rsyslog
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when: rsyslog_base.changed or rsyslog_confd.changed
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changed_when: true
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# --- 6.1.4.1 Permissions et ownership sur /var/log ---
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- name: Deployer le script de correction des permissions /var/log
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ansible.builtin.template:
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src: ../templates/fix_logfile_perms.sh.j2
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dest: /tmp/fix_logfile_perms.sh
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owner: root
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group: root
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mode: "0700"
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- name: Executer la correction des permissions /var/log (ne fait que restreindre)
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ansible.builtin.command:
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cmd: bash /tmp/fix_logfile_perms.sh
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register: logperm_fix
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changed_when: "'OK' in logperm_fix.stdout"
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- name: Retirer other-read sur les logs apt et README
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ansible.builtin.shell: |
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chmod o-r /var/log/README /var/log/apt/*.log /var/log/apt/*.log.*.gz /var/log/apt/*.xz 2>/dev/null || true
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changed_when: true
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- name: Supprimer le script temporaire
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ansible.builtin.file:
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path: /tmp/fix_logfile_perms.sh
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state: absent
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- name: Confirmer le succes pour cet host
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ansible.builtin.debug:
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msg: "✅ journald/rsyslog/timesyncd durcis sur {{ inventory_hostname }} (aucun reboot requis)."
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Nuxgrid