Ensure access to SSH public host key files is configured

СредњаНиво 1Аутоматскаlinux

Опис

An SSH public key is one of two files used in SSH public key authentication. In this authentication method, a public key is a key that can be used for verifying digital signatures generated using a corresponding private key. Only a public key that corresponds to a private key will be able to authenticate successfully.

Како се проверава

Метод провере: Команда љуске

shell

alt0() { o=$(bash -c '#!/usr/bin/env bash
{
   l_ssh_group=""
   grep -Psiq -- '"'"'^\h*ID_LIKE="?([^#\n\r]+)?\bfedora\b'"'"' /etc/os-release 2>/dev/null && \
      grep -Psq -- '"'"'^ssh_keys\b'"'"' /etc/group 2>/dev/null && l_ssh_group="ssh_keys"
   while IFS= read -r l_key; do
      l_file="${l_key}.pub"
      ssh-keygen -lf "$l_file" &>/dev/null || continue
      while IFS=: read -r l_mode l_owner l_group; do
         if [ $(( l_mode & 0133 )) -gt 0 ] || [ "$l_owner" != "root" ] || \
            { [ "$l_group" != "$l_ssh_group" ] && [ "$l_group" != "root" ];
}; then
            printf '"'"'%s\n'"'"' "\"$l_file\": mode $l_mode owner $l_owner group $l_group"
         fi
      done < <(stat -Lc '"'"'%#a:%U:%G'"'"' "$l_file")
   done < <(sshd -T 2>/dev/null | awk '"'"'$1=="hostkey"{print $2}'"'"')
}' 2>&1); [ -z "$o" ] || { echo "step1: $o" | head -c 300; return 1; }; }; if alt0; then echo compliant; fi

Очекивани излаз: compliant

Како се исправља

Метод исправке: Смерница или закрпа инфраструктуре

Run the following script to set the owner, group, and restrict permissions on each SSH public host key file from the running sshd configuration: #!/usr/bin/env bash { while IFS= read -r l_key; do l_file="${l_key}.pub" [ -e "$l_file" ] || continue chown root:root "$l_file" chmod u-x,go-wx "$l_file" done < <(sshd -T 2>/dev/null | awk '$1=="hostkey"{print $2}') }

Својства

Оперативни системи: almalinux-9
Ознаке: cis-convertedlinux
Референца: CIS AlmaLinux OS 9 Benchmark v3.0.0 - 5.1.4

Проверите овај рачунар

Покрените ово на рачунару за који имате дозволу за проверу. Скенирање ради у режиму само за читање.

shell

tmaegis scan --target linux