TMA-COS-1.2.1

Ensure dm-verity is enabled

СреднийУровень 1Автоматическаяcos

Описание

device-mapper-verity (dm-verity) kernel feature feature provides transparent integrity checking of block devices using a cryptographic digest provided by the kernel crypto API. When a dm-verity device is configured, it is expected that the caller has been authenticated in some way (cryptographic signatures, etc). After instantiation, all hashes will be verified on-demand during disk access. If they cannot be verified up to the root node of the tree, the root hash, then the I/O will fail. This should detect tampering with any data on the device and the hash data. The Container-Optimized OS root filesystem is always mounted as read-only. Additionally, its checksum is computed at build time and verified by the kernel on each boot. This mechanism prevents against attackers from "owning" the machine through permanent local changes.

Как проверяется

Метод проверки: Команда оболочки

shell

alt0() { command -v grep >/dev/null 2>&1 || { echo "step1: grep not installed"; return 1; }; command -v zcat >/dev/null 2>&1 || { echo "step1: zcat not installed"; return 1; }; o=$(bash -c 'zcat /proc/config.gz | grep CONFIG_DM_VERITY' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- CONFIG_DM_VERITY=y || { echo step1: missing CONFIG_DM_VERITY=y; return 1; }; }; if alt0; then echo compliant; fi

Ожидаемый вывод: compliant

Как исправляется

Метод исправления: Рекомендация или патч инфраструктуры

An OS image update that has the dm-verity enabled kernel is required.

Свойства

Операционные системы: Любая
Теги: container-optimized-oscos
Источник: CIS Google Container-Optimized OS Benchmark v1.2.0 - 1.2.1 Ensure dm-verity is enabled

Проверить этот хост

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

shell

tmaegis scan --target cos