"SetUID, SetGID, 스티키비트"의 두 판 사이의 차이

2014년 12월 22일 (월) 01:19 판

1 개요

리눅스 setuid, setgid

접근권한을 나타내는 플래그
사용자가 실행파일을 실행할 때 실행파일의 소유자/그룹의 권한으로 실행가능
setuid : 실행을 위한 사용자 ID 설정
setgid : 실행을 위한 그룹 ID 설정

2 예시

[root@jmnote ~]# ll /etc/passwd
-rw-r--r--. 1 root root 1512 Dec 18 20:46 /etc/passwd

→ /etc/passwd의 퍼미션은 0644

[root@jmnote ~]# ll /usr/bin/passwd
-rwsr-xr-x. 1 root root 30768 Feb 22  2012 /usr/bin/passwd

→ /usr/bin/passwd의 퍼미션은 4755

3 실습

[root@jmnote ~]# touch a
[root@jmnote ~]# chmod 4755 a
[root@jmnote ~]# ll a
-rwsr-xr-x. 1 root root 0 Dec 21 08:18 a

[root@jmnote ~]# ll /usr/bin/passwd
-rwsr-xr-x. 1 root root 30768 Feb 22  2012 /usr/bin/passwd

4 같이 보기

5 참고 자료

@@ 7번째 줄: / 7번째 줄: @@
 ==예시==
+<source lang='cli'>
+[root@jmnote ~]# ll /etc/passwd
+-rw-r--r--. 1 root root 1512 Dec 18 20:46 /etc/passwd
+</source>
+:→ /etc/passwd의 퍼미션은 0644
 <source lang='cli'>
 [root@jmnote ~]# ll /usr/bin/passwd
 -rwsr-xr-x. 1 root root 30768 Feb 22  2012 /usr/bin/passwd
 </source>
+:→ /usr/bin/passwd의 퍼미션은 4755
-==실습 1==
+==실습==
 <source lang='cli'>
 [root@jmnote ~]# touch a
-[root@jmnote ~]# chmod 0000 a
-[root@jmnote ~]# ll a
-----------. 1 root root 0 Dec 21 08:00 a
-</source>
-<source lang='cli'>
-[root@jmnote ~]# chmod 2000 a
-[root@jmnote ~]# ll a
-------S---. 1 root root 0 Dec 21 08:00 a
-</source>
-<source lang='cli'>
-[root@jmnote ~]# chmod 4000 a
-[root@jmnote ~]# ll a
----S------. 1 root root 0 Dec 21 08:00 a
-</source>
-<source lang='cli'>
-[root@jmnote ~]# chmod 6000 a
-[root@jmnote ~]# ll a
----S--S---. 1 root root 0 Dec 21 08:00 a
-</source>
-==실습 2==
-<source lang='cli'>
-[root@jmnote ~]# chmod 0755 a
-[root@jmnote ~]# ll a
--rwxr-xr-x. 1 root root 0 Dec 21 08:00 a
-</source>
-<source lang='cli'>
-[root@jmnote ~]# chmod 2755 a
-[root@jmnote ~]# ll a
--rwxr-sr-x. 1 root root 0 Dec 21 08:00 a
-</source>
-<source lang='cli'>
 [root@jmnote ~]# chmod 4755 a
 [root@jmnote ~]# ll a
--rwsr-xr-x. 1 root root 0 Dec 21 08:00 a
+-rwsr-xr-x. 1 root root 0 Dec 21 08:18 a
 </source>
 <source lang='cli'>
-[root@jmnote ~]# chmod 6755 a
+[root@jmnote ~]# ll /usr/bin/passwd
-[root@jmnote ~]# ll a
+-rwsr-xr-x. 1 root root 30768 Feb 22  2012 /usr/bin/passwd
--rwsr-sr-x. 1 root root 0 Dec 21 08:00 a
 </source>
@@ 68번째 줄: / 41번째 줄: @@
 ==참고 자료==
 *https://en.wikipedia.org/wiki/Setuid
+*https://www.linux.co.kr/home/lecture/?leccode=476
+*http://docs.oracle.com/cd/E19683-01/806-4078/secfiles-69/index.html
 [[분류: 리눅스]]