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setuidsetgid

???????. ????????????????????????????????????????????????????????????? etc.????????????????????????????????????ls?????????????ls a?????????????????????????????????????????????????..filename?filename?????????????. ls. ??????????ls ????? ??????????????????-a???????????-l????????????

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setuidsetgid

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    1. ???????? ?4? ????????????

    2. ??????? ????????????? ???????? ????????? ????????????? ??????????? ?????(????????)????????????????????????? ???????????????? ??????????????????????? ???????????? setuid?setgid????????????????

    3. ??????? ?????? ?????????? ??????? ???????????????? ?????????????????????? etc. ????????????????????? ???????????????ls????????????? ls –a??????????? ???????????????????? ?????????????????? ..filename?…filename?????????????

    4. ls ?????????? ls ????? ??????·???? ???????? -a ??????????? -l ??????????????????????? -R ??????????????? -i i???????? -u ????????(???????)??? -s ?????????????????

    5. ls ????????????? [??][??????][???????][??????] ????? d ?????? l ????????? ????? ? [??][??][??]?????? ?? r????????-???? ?? w????????-???? ?? x ??? S ????????????????????????? setuid????????????setgid S ??????????????????????? setuid????????????setgid 8????????????

    6. ls ? drwxr-xr-x (0755) ???????????????????????????????????????????? -rw-r--r-- (0644) ???????????????????????????????????????? -rw------- (0600) ???????????????????? -rwsr-xr-x (4600) ???????????????????????????????????????????????setuid?????

    7. chown ????????????? chown ????? ???:???? ????·?????? ???????? -R ?????????????????????·??????????????? ???????? ??????????????ID?????ID????? ???????????????:??????????? ???????????????????? ???????????????:?????????? ???????root?? ??????????????????????????????????

    8. chmod ???????????? chmod ????? ?????? ???????? -R ?????????????????????·??????????????? ?????? 8????? ??????????????????????????????????????? ???? [???·????·???][??·???][??·??·??] ugo+rwx ??????????????????????? ???? go-w ????????????????????

    9. chflags (BSD???) ????????????? chmod???????????????????????? archive ??????? opaque ??? nodump ?????? sappend?uappend ????? schg?uchg ???? sunlink?uunlink ???? S???????????? U??????????? chflags schg /boot/kernel/kernel /boot/kernel/kernel???????????????? chflags noschg hogehoge ????hogehoge???????????????????

    10. ??????? ??????? HDD??????????????????????? ???OS????? ???OS???????????????????? Windows????1??HDD?C?????D???????????????? HDD???????????????? ???????OS?????? OS????????????

    11. PC???????? ???IBM PC???????????? OS????????? 4??????????? ???? ?????? Windows??????????? ????????? UNIX??????????? ????????? ???????????????????????????????????????????????

    12. UNIX???????? ?????PC?????????????HDD??? 1??HDD?8??????? PC?????UNIX??OS??????? Linux PC???????????????????? ???PC????????????????????????????????????????? FreeBSD?? PC???????????8???? ??PC???????????HDD???????? UNIX??????????????????????

    13. ???????????? Windows????????????UNIX??????? UNIX??????????4???

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