Ensure default user umask is 027 or more restrictive

보통레벨 2자동cos

설명

The default umask determines the permissions of files created by users. The user creating the file has the discretion of making their files and directories readable by others via the chmod command. Users who wish to allow their files and directories to be readable by others by default may choose a different default umask by inserting the umask command into the standard shell configuration files ( .profile , .bashrc , etc.) in their home directories. Setting a very secure default value for umask ensures that users make a conscious choice about their file permissions. A default umask setting of 077 causes files and directories created by users to not be readable by any other user on the system. A umask of 027 would make files and directories readable by users in the same Unix group, while a umask of 022 would make files readable by every user on the system.

점검 방법

감사 방식: 셸 명령

shell

ok=0; grep -Eiq "^\s*UMASK\s+(0[0-7][2-7]7|[0-7][2-7]7)\b" /etc/login.defs 2>/dev/null && ok=1; grep -REiq "^\s*umask\s+(0[0-7][2-7]7|[0-7][2-7]7)\b" /etc/profile /etc/profile.d /etc/bashrc 2>/dev/null && ok=1; bad=$(grep -RPih "(^|^[^#]*)\s*umask\s+([0-7][0-7][01][0-7]\b|[0-7][0-7][0-7][0-6]\b|[0-7][01][0-7]\b|[0-7][0-7][0-6]\b)" /etc/login.defs /etc/profile /etc/profile.d /etc/bashrc 2>/dev/null); [ $ok -eq 1 ] && [ -z "$bad" ] && echo compliant || echo noncompliant

예상 출력: compliant

조치 방법

조치 방식: 가이드 또는 인프라 패치

Edit the /etc/bash/bashrc, /etc/profile and /etc/profile.d/*.sh files (and the appropriate files for any other shell supported on your system) and add or edit any umask parameters as follows: umask 027

속성

운영 체제: 모두
태그: container-optimized-oscos
참고 자료: CIS Google Container-Optimized OS Benchmark v1.2.0 - 5.3.4 Ensure default user umask is 027 or more restrictive

이 호스트 점검하기

감사 권한이 있는 시스템에서 실행하세요. 스캔은 읽기 전용입니다.

shell

tmaegis scan --target cos --level 2