controls/cis_debian13: Add CIS Debian Linux 13 sections 6-7

[israel-villar]

Add logging/auditing (section 6) and system maintenance (section 7) controls to the CIS Debian Linux 13 benchmark mapping.

Section 6 covers:

• 6.1.1: systemd-journald configuration (log file access, rotation, compression, persistent storage, message size, forwarding to syslog)
• 6.1.2: journald configuration via /etc/systemd/journald.conf
• 6.1.3: log file permissions
• 6.2: rsyslog configuration and remote logging
• 6.3: log file access and permissions (logrotate, /var/log)

Section 7 covers:

• 7.1: file permission hardening for system files (/etc/passwd, /etc/group, /etc/shadow, /etc/gshadow and their backups)
• 7.2: local user and group integrity checks

All 205 rule references verified to resolve against current master.

Description:

• Add Logging and Auditing (section 6) controls: 80 controls covering
  systemd-journald service and journal-remote configuration, rsyslog
  installation, service, log forwarding, logrotate, TLS (gtls), and CA
  certificates; auditd service, data retention, 37 audit rules, and file
  access permissions; and AIDE integrity checking.

• Add System Maintenance (section 7) controls: 23 controls covering
  system file and directory access (/etc/passwd, /etc/shadow, /etc/group,
  /etc/gshadow and their backups, /etc/shells, world-writable files, unowned
  files, SUID/SGID review) and local user and group integrity (shadow
  passwords, duplicate UIDs/GIDs/names, home directories, dot files).

Rationale:

• Sections 6 and 7 of the CIS Debian Linux 13 Benchmark v1.0.0 (published
  2025-12-16) were not yet present in controls/cis_debian13.yml. This PR
  continues the incremental mapping started in controls/cis_debian13: Complete and correct section 1 controls #14806 (section 1) and
  follows Add CIS Debian Linux 13 sections 2-4 to controls file #14876 (sections 2–4).

• All 103 control IDs verified against the benchmark PDF, all 205 rule
  references resolve against current master, Automated/Manual classification
  and L1/L2 level assignments match the benchmark for every control.

Review Hints:

• Build the product to verify the control file is valid:
  ./build_product debian13 --datastream-only

• Only controls/cis_debian13.yml is modified — a single commit, safe to
  review as one diff.

• Related PRs: section 1 pending controls/cis_debian13: Complete and correct section 1 controls #14806, sections 2–4 pending Add CIS Debian Linux 13 sections 2-4 to controls file #14876,
  section 5 pending Add Debian 13 PAM support to existing rules #14781.

[openshift-ci]

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