Linux Admin2 - Chapter6 Control access to files with Access Control Lists (ACL)

1. 파일/디렉토리 퍼미션

전통적인 퍼미션은 권한을 3개만 줄수있다. (소유자/그룹/others)

ACL은 퍼미션의 확장판판

2. setfacl

1) setfacl -x u:sinuhe /usr/bin/vim         : 따로따로 acl 삭제

2) setfacl -b /srv/ftp                                   : acl 모두 삭제

3) setfacl -m 대상(ex: u,g):세부내역:퍼미션           : 파일 및 디렉토리

4) setfacl -m d:g:webdev:rw /srv/www             : SETGID 역할. /srv/www 밑에 폴더는 누가 만들든 webdev라는 소유그룹으로 만들어진다.

[root@station13 ~]# touch 1.txt
[root@station13 ~]# ll 1.txt
-rw-r--r--. 1 root root 0 Jul 19 11:44 1.txt
[root@station13 ~]# chmod o-r 1.txt
[root@station13 ~]# ll 1.txt
-rw-r-----. 1 root root 0 Jul 19 11:44 1.txt
[root@station13 ~]#
[root@station13 ~]#
[root@station13 ~]# setfacl -m u:guru:rw 1.txt          // guru 유저에 대해서 rw 권한 주겟다
[root@station13 ~]# setfacl -m u:visitor:4 1.txt          // visitor 유저에 대해서 r
[root@station13 ~]# setfacl -m g:bigdata:rwx 1.txt    //bigdata 그룹에 대해 rwx 권한 주겠다.

[root@station13 ~]# ll 1.txt
-rw-rwx---+ 1 root root 0 Jul 19 11:44 1.txt

[root@station13 ~]# getfacl 1.txt
# file: 1.txt
# owner: root
# group: root
user::rw-
user:guru:rw-
user:visitor:r--
group::r--
group:bigdata:rwx
mask::rwx               //유저나 그룹이 가질 수 있는 최대값이 마스크. 마스크와 유저에 설정한 값은 &연산해서 실질적인 퍼미션이 나옴.

                                  // 마스크가 변경되어서 퍼미션이 변경되면 effective라고 표시됨.

                                  // ACL 설정만 영향을 줌.

  // 설정한 user or group ACL의 최대값이 마스크값으로 설정됨.

other::---

[root@station13 ~]# setfacl -m m::4 1.txt  //r권한 mask값 줌

[root@station13 ~]# getfacl 1.txt
# file: 1.txt
# owner: root
# group: root
user::rw-                                                        // ACL 아니고 전통적인 퍼미션이라 영향 안 받음.
user:guru:rw-            #effective:r--            // 실제 부여는 rw 했지만 mask땜에 r권한 밖에 없다.
user:visitor:r--
group::r--
group:bigdata:rwx        #effective:r--     // 실제 부여는 rwx 했지만 rwx&r-- 하면 r--만 남는다.
mask::r--                                                       // ACL 에만 영향을 준다.
other::---

[root@station13 ~]# setfacl -x u:guru 1.txt        //-x: 특정 ACL만 삭제
[root@station13 ~]# getfacl 1.txt
# file: 1.txt
# owner: root
# group: root
user::rw-
user:visitor:r--
group::r--
group:bigdata:rw-
mask::rw-
other::---

[root@station13 ~]# setfacl -b 1.txt           // 다 삭제
[root@station13 ~]# getfacl 1.txt
# file: 1.txt
# owner: root
# group: root
user::rw-
group::r--
other::---

3. FACLs 백업 / 복구

[root@station13 ~]# getfacl -R /root | more
getfacl: Removing leading '/' from absolute path names    ---> 상대경로로 보여짐.
# file: root
# owner: root
# group: root
user::r-x
group::r-x
other::---

# file: root/.bash_logout
# owner: root
# group: root
user::rw-
group::r--
other::r--

# file: root/.bash_profile
# owner: root
# group: root
user::rw-
group::r--
other::r--

// 그래서 --absolute-name 옵션 줘서 절대경로로 해줘야 백업하고 복구할때 정상적으로 복구됨.

[root@station13 ~]# getfacl -R --absolute-name /root | more
# file: /root
# owner: root
# group: root
user::r-x
group::r-x
other::---

# file: /root/.bash_logout
# owner: root
# group: root
user::rw-
group::r--
other::r--

# file: /root/.bash_profile
# owner: root
# group: root
user::rw-
group::r--
other::r--

[root@station13 ~]# getfacl -R --absolute-name /root | more > /tmp/acl.backup            //출력 리다이렉션으로 백업.
[root@station13 ~]#

[root@station13 etc]# setfacl --restore=/tmp/acl.backup                // 복구
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/2C8B77E9B01B9EA0EE9B59E0248DA3D48194D56C: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/418E2A0CE2F47C119625CA4E96133E2369F9613A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/A2696B69E11A3ED4CFABFCE97FCCE09F454792F6: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/9455DD50716CCD60115B474396E11DAC01B3897D: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/6A06C51DCB18742C1069FC4B26B1D4B9B4F380BD: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/2444FBDB40B82A11FEC034075F235F9A6608E195: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/4D708CE4DCCD9DCE383CEE6A03932A140C342B6A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/AC013C2C0163FF0EB0AD2B5218B0F021558249B2: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/8D60D2E52AD41FABA2D7B197EB8ED25CCD05BDB2: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/8322738C2C8716AC9DB919717F059AB5487A2582: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/DF0F51AD1F27FFFFD53FF2EF3737942AAC8AFBFF: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/6CDDDFA42B7D50FD5FAB9CC3C2591EAFE92E72E0: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/C4419DE79890D66742A84CDF96361D05E79F3876: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/4043EBC1F04AC478B7BFA0C4E77F2DE4BC1F584B: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/ADF6D4D23748021E1A8A347EF1040436D22F2DE8: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/831DCB4F82FD7D1B2DE095D0462D2A37C353C230: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/BA461DC508977ECA41D0A5FB61369CF6F299C68E: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/899CADAA9784EEE56187EB3B3BB89130C0A8CE0B: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/25CFD43D1D1B721D8E3099B3BBE1E1E50AD954E3: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/15612229EA7EB97A9737F7F96A9E871AFE15CF3C: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/0ED2141D870B314B135FEB69BE8EFEDB05964E9A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/6EFF9F94C8718830C6995D0C77E5BFD3A5CC6D4F: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/CC247565574A76E2560F9CD2FBF1709C6D3E3C11: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/8162D52E97EC9886E3B00741BB87618C235BF7AA: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/D2E6FF4C643F9356805D4AC9CDC02E1082A7E806: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/0D62ECC2D8BE83B64BEC9F499241E1B27FB698B2: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/C9AC45F147F6CE647B1E94EE78139E5300BEC7BD: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/3E1EDAD135823577A553E0856C9DC1D8925741C9: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/E72ECD4DE0CAAA1E47BCF5D4DE647DDEF1B21F59: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/5F5C5046EFEFAEDC184D76C8A2FC634ABC8FDA64: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/D31EF4151CC664CE58B245DB1E3F741D73883570: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/200BB8D03DB8F6ADFF8C50D19E67ACA0C1FDB13A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/887BA0AE64B7F2D22CEDAB57946A3E49EB8CCDCE: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/0D5D02E5C7FB4E601021D1C16AD9AB51E2158CD9: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/1FE9F097263EEBBBB0848AB55B1C2889BCEDEDA6: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/830EDC9A31BACD2F22CCEE247EEDDA699FFC7E50: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/23B67D11990AE53BA0DAECD34BF4D4C578ED3C5E: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/2B6F71C99A726C574460A5D32687FC1569883AA2: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/EB7EEA4A8C4845135FD1584B0B388A2930BC2749: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/BEC740E62030E0EFE28A84662D4E5C089971AECC: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/74A7A3C1002B1C2F9C7FCF0E8336910ADE764FBC: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/224EA79E629B245C3E5A3FD09835931F642D2BD2: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/C41EAAC97EC5F51C2211A02EC29000505B611785: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/1EA2E13B11C6472D1485E9D3231D4FCFFABD8076: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/A6C196799ABD6DF032F4BCFB174CF6B78273FB7B: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/8E858743C86F49EA1593A7ADFDA44E4765C2C654: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/43299709E5A14A99506351D578160FAD2BAD4AB6: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/69F244B8C26D2731977E510E9D713EB51E874035: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/B6A4F0F7049E35E841F56AD20128382BB46DCDC7: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/D95F1DB4D5A479304C6940BEFFE1BE3096C5A430: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/02D53AD00C9D207F8800F910A5FDAE05D72FB732: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/F36BBD487F55CD0373380ADE734E41FDA4CF730D: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/2B3D701001A1040046F04DED7565C0884149C9CB: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/AA02A8CD01124B970E1BE778FEF70FB4EE67E881: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/FC6D52F07833EE2B21B9FD597BE70FA3C3917EE1: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/A02616CB35BBC157099E6086ADCD37CEBDCA2A1A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/72FDFFF7845620D7D56EB7E1E840D8F784B77701: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/D9CF06940708219AC446E4D3B16BC9E1E5D358E3: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/20F0203F97519C407052B0007AF31667EB3EF778: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/B3FC3A4E37AEC60340F6F98B52B4BD0299D0E3D0: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/5D48F4B5A0C5D5DB84F73FCBEDEFE32764F5C7CC: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/ABF0BE5BE50A7751D3B927B3D3D502E2C037D7CE: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/64B71E32F446DF626DBE1DA14D48B2E0029A1A30: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/A114674EA1965763F020905B852C9CC3AEDCDD2A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/709AD1FAE5ED616D0833BC807BDD632BAE34D36A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/1DBAB1A50F732AF07ADD74182B4C7650AED8D4F3: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/7BE7E26BDF299E07621127AE4A3B12E457FCE7DA: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/2A1CE638DC141D4E1021A363CBABE5F01F06A01D: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/497A4AEC0FFF6D5F53136AC71196F2F9A1A4C6EF: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/8F6F4B30004B7917AD3A797B74B858FE5A2620D6: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/569957E62EF6E97A2A5A341E5D2C03315303892A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/BEA278ED86F26298D60FAE212966D3F3F4EB34A2: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/E69208A702DBDE76A29C69E4AAA137E09DA5A4D7: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/10815EF5D94B1D33A3464DF7D5F597F5F416C3F2: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/24201FD5217543B6197CE250DA5006D63DFAAB62: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/7EBB1EC25D84027C71C6D6284BF0E29B27B4EB6E: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/A11558DD7606B2F67F8B8105BA0A91C469DFEEA5: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/429B03CB289E225BB189CA1D4B2E93B3F80AAA1D: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/AD2179401F3157F66AD72C9079E0A29BCE893742: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/10E790F64715A83FD79E4A47E4C515A235963122: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/48233226D5D8828C1F383043C68F35C07DA76FD4: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/5189AE97CD6A03DEE5A69B91C7F99162AC232F34: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/DA066649A99F3871BB8DE1B2D3D0275C6834BDA5: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/5AD4BD186A29F2EED5743D546C66EDF6E4EC3C1A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/8C6D119C5AE554424FCC05955D460EF1316BC6CD: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/64F730E2314A3172105001BD715F86EF5F48A8AB: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/8839A186388EFFBEA276A781BCAC62BA29FC1334: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/B9FA459E894039A1815C925171EBD3AB4EC21D48: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/5F9CB8AA269A1B59BE58B801E7DC4FA8E7C8E158: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/12280C4FE35DDD0CC5736F779A4D39740107DC21: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/0258BAD2EC32A5E430D0FC3B3FFC19671168B42A: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/0F8A558A305B4B51665F6F4ED0BDBA288B07B2F0: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/BA58A04298F2F925761C9BB630D3CD1EB856939B: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/F8DAD7BCD85D6104E232803CB13C3AC48C1C9542: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/F025184F4530FC594D52DA2F46C90B34F799BD79: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/F6E9586FD4ABD4675B9F9D6A6F541A6115D4904E: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/2FE42B42ABAA6EA6726DE3782A6BA4D1228F55F4: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/6693C714BCEF3954C7D9E06937F2B3483E9849FC: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/3E1D1B620E12844CBF18C1E3584745935AC982CE: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/75C25AB2B8D0D6C68DB386D4947ACEE9C41BB5ED: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/214C5442C6EC83E8A8C72C7B6229B5891323A81B: No such file or directory
setfacl: /root/.cache/mozilla/firefox/j7wyjwlf.default/cache2/entries/7BA0C50A8DE29E66E8F2F38ADB94F79E590765DA: No such file or directory
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