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TMA-ROCKY8-3.3.1.14

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

Trung bìnhCấp 1Tự độnglinux

Mô tả

The accept_source_route option causes network interfaces to accept packets with the Strict Source Route (SSR) or Loose Source Routing (LSR) option set. net.ipv4.conf.all.accept_source_route controls accepting of all IPv4 packets with the SSR or LSR option set on all interfaces. In networking, source routing allows a sender to partially or fully specify the route packets take through a network. In contrast, non-source routed packets travel a path determined by routers in the network. In some cases, systems may not be routable or reachable from some locations (e.g. private addresses vs. Internet

Cách kiểm tra

Phương pháp kiểm tra: Lệnh shell

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.accept_source_route 0; then echo compliant; fi
Đầu ra mong đợi
compliant

Cách khắc phục

Phương pháp khắc phục: Hướng dẫn hoặc bản vá hạ tầng

1. Review all files being used by systemd sysctl and comment out or remove all net.ipv4.conf.all.accept_source_route lines that are not net.ipv4.conf.all.accept_source_route=0. Example script: #!/usr/bin/env bash { l_option="net.ipv4.conf.all.accept_source_route" l_value="0" l_grep="${l_option//./(\\.|\\/)}" a_files=() l_systemdsysctl="$(readlink -e /lib/systemd/systemd-sysctl \ || readlink -e /usr/lib/systemd/systemd-sysctl)" l_ufw_file="$([ -f /etc/default/ufw ] && \ awk -F= '/^\s*IPT_SYSCTL=/ {print $2}' /etc/default/ufw)" [ -f "$(readlink -e "$l_ufw_file")" ] && \ a_files+=("$l_ufw_file"); a_files+=("/etc/sysctl.conf") while IFS= read -r l_fname; do l_file="$(readlink -e "${l_fname//# /}…

Thuộc tính

Hệ điều hành
rocky-8
Thẻ
cis-convertedkernellinuxsysctl
Tham chiếu
CIS Rocky Linux 8 Benchmark v3.0.0 - 3.3.1.14

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shell
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