TMAegisБета
Другие правила для linux

Linux distributions

TMA-ROCKY9-3.3.1.2

Ensure net.ipv4.conf.all.forwarding is configured

СреднийУровень 1Автоматическаяlinux

Описание

ICMP Redirects are used to send routing information to other hosts. As a host itself does not act as a router (in a host only configuration), there is no need to send redirects. net.ipv4.conf.all.forwarding controls forwarding of IPv4 packet on all interfaces. More information about the kernel parameter configuration files, their location, and load preference is available in the "Configure Network Kernel Parameters" section overview. Note: • If this system is a router this recommendation is not applicable. • If net.ipv4.ip_forward=0 is configured, this recommendation may be skipped.

Как проверяется

Метод проверки: Команда оболочки

shell
chk() { p=$1; allowed=" $2 "; case $p in net.ipv6.*) [ -d /proc/sys/net/ipv6 ] || return 0;; esac; v=$(sysctl -n "$p" 2>/dev/null) || { echo "$p: not available"; return 1; }; case "$allowed" in *" $v "*) ;; *) echo "$p is $v (running)"; return 1;; esac; sd=$(readlink -e /lib/systemd/systemd-sysctl || readlink -e /usr/lib/systemd/systemd-sysctl); f=$("$sd" --cat-config 2>/dev/null | grep -Po "^\h*${p//./\.}\h*=\h*\K\H+" | tail -n1); [ -n "$f" ] || { echo "$p is not set in any sysctl configuration file"; return 1; }; case "$allowed" in *" $f "*) ;; *) echo "$p is $f in configuration"; return 1;; esac; }; if chk net.ipv4.conf.all.forwarding 0; then echo compliant; fi
Ожидаемый вывод
compliant

Как исправляется

Метод исправления: Рекомендация или патч инфраструктуры

1. Review all files being used by systemd-sysctl and comment out or remove all net.ipv4.conf.all.forwarding lines that are not net.ipv4.conf.all.forwarding=0. Example script: #!/usr/bin/env bash { l_option="net.ipv4.conf.all.forwarding" l_value="0" l_grep="${l_option//./(\\.|\\/)}" a_files=() l_systemdsysctl="$(readlink -e /lib/systemd/systemd-sysctl \ || readlink -e /usr/lib/systemd/systemd-sysctl)" a_files+=("/etc/sysctl.conf") while IFS= read -r l_fname; do l_file="$(readlink -e "${l_fname//# /}")" [ -n "$l_file" ] && ! grep -Psiq -- '(^|\h+)'"$l_file"'\b' \ <<< "${a_files[*]}" && a_files+=("$l_file") done < <("$l_systemdsysctl" --cat-config | tac | \ grep -Psio -- '^\h*#\h*\/[^#\n\r\h]+\…

Свойства

Операционные системы
rocky-9
Теги
cis-convertedkernellinuxsysctl
Источник
CIS Rocky Linux 9 Benchmark v3.0.0 - 3.3.1.2

Проверить этот хост

Выполните команду на компьютере, аудит которого вам разрешён. Сканирование работает только на чтение.

shell
tmaegis scan --target linux