59 lines
2.1 KiB
YAML
59 lines
2.1 KiB
YAML
---
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# CIS 3.x (Netzwerk) / 1.5.x (Kernel-Haertung). Bewusst ueber
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# ansible.builtin.copy + "sysctl --system" statt des ansible.posix.sysctl-
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# Moduls (siehe Kommentar in Kap. 7/README) -- keine Zusatz-Collection als
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# Voraussetzung fuer den Betrieb dieses Playbooks.
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- name: Kernel-/Netzwerk-Haertung (sysctl)
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ansible.builtin.copy:
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dest: /etc/sysctl.d/99-jumphost-hardening.conf
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owner: root
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group: root
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mode: "0644"
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content: |
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# --- Netzwerk (CIS 3.x) ---
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net.ipv4.conf.all.rp_filter = 1
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net.ipv4.conf.default.rp_filter = 1
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.all.secure_redirects = 0
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net.ipv4.conf.default.secure_redirects = 0
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.default.accept_source_route = 0
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net.ipv4.conf.all.log_martians = 1
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net.ipv4.conf.default.log_martians = 1
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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net.ipv4.tcp_syncookies = 1
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net.ipv4.ip_forward = 0
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net.ipv6.conf.all.accept_redirects = 0
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net.ipv6.conf.default.accept_redirects = 0
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net.ipv6.conf.all.accept_source_route = 0
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net.ipv6.conf.default.accept_source_route = 0
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{% if os_hardening_disable_ipv6 %}
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net.ipv6.conf.all.disable_ipv6 = 1
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net.ipv6.conf.default.disable_ipv6 = 1
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{% endif %}
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# --- Kernel-Haertung (CIS 1.5.x) ---
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kernel.kptr_restrict = 2
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kernel.dmesg_restrict = 1
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kernel.randomize_va_space = 2
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kernel.yama.ptrace_scope = 1
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fs.suid_dumpable = 0
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fs.protected_hardlinks = 1
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fs.protected_symlinks = 1
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fs.protected_fifos = 2
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fs.protected_regular = 2
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notify: apply sysctl
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- name: Core Dumps zusaetzlich auf PAM-Ebene deaktivieren (CIS 1.5.1)
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ansible.builtin.copy:
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dest: /etc/security/limits.d/99-jumphost-no-coredumps.conf
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owner: root
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group: root
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mode: "0644"
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content: |
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* hard core 0
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