1.\u4f9d\u7167\u6587\u4ef6\u5c5e\u6027\u67e5\u627e<\/p>\n
\u6587\u4ef6\u5c5e\u6027\u4e3b\u8981\u662f\u6307\u6587\u4ef6\u7684\u6240\u6709\u8005\u548c\u6240\u5c5e\u7ec4\u8fd9\u4e24\u79cd\u6240\u5c5e\u5173\u7cfb\u3002\u6309\u6587\u4ef6\u5c5e\u6027\u67e5\u627e\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u9009\u9879\uff1a<\/p>\n
l-user\u7528\u6237\u540d\uff1a\u6309\u7167\u6240\u6709\u8005\u67e5\u627e\uff1b<\/p>\n
l-group\u7ec4\u540d\uff1a\u6309\u7167\u6240\u5c5e\u7ec4\u67e5\u627e\uff1b<\/p>\n
l-uidUID\uff1a\u6309\u7167UID\u67e5\u627e\uff1b<\/p>\n
l-gidGID\uff1a\u6309\u7167GID\u67e5\u627e\uff1b<\/p>\n
l-nouser\uff1a\u67e5\u627e\u6ca1\u6709\u6240\u6709\u8005\u7684\u6587\u4ef6\uff1b<\/p>\n
l-nogroup\uff1a\u67e5\u627e\u6ca1\u6709\u6240\u5c5e\u7ec4\u7684\u6587\u4ef6\u3002<\/p>\n
\u4f8b\uff1a\u5728\/home\u76ee\u5f55\u4e0b\u67e5\u627e\u6240\u6709\u5c5e\u4e8e\u7528\u6237student\u7684\u6587\u4ef6\u6216\u76ee\u5f55\u3002<\/p>\n
[root@localhost~]#find\/home-userstudent-ls<\/p>\n
4009034drwx------4studentstudent40969\u6708816:33\/home\/student<\/p>\n
rw-r--r--1studentstudent1761\u6708162015home\/student\/.bash_profile<\/p>\n
\u2026\u2026<\/p>\n
\u4f8b\uff1a\u5728\/var\u76ee\u5f55\u4e2d\u67e5\u627e\u6240\u6709\u8005\u4e3aroot\u4e14\u6240\u5c5e\u7ec4\u4e3amail\u7684\u6587\u4ef6\u6216\u76ee\u5f55\u3002<\/p>\n
[root@localhost~]#find\/var-userroot-groupmail-ls<\/p>\n
6553094drwxrwxr-x2rootmail409612\u67082311:24\/var\/spool\/mail<\/p>\n
\u6709\u65f6\u53ef\u80fd\u4f1a\u78b0\u5230\u8fd9\u6837\u7684\u60c5\u51b5\uff0c\u4f8b\u5982\u6587\u4ef6\/tmp\/test\u5c5e\u4e8ezhangsan\u6240\u6709\uff0c\u5018\u82e5\u5c06\u7528\u6237zhangsan\u5220\u6389\uff0c\u8fd9\u4e48\/tmp\/test\u7684\u6240\u6709\u8005\u548c\u6240\u5c5e\u7ec4\u5c31\u5f04\u6210\u4e86zhangsan\u4ee5\u524d\u7684uid\u548cgid\u3002<\/p>\n
[root@localhost~]#ll\/tmp\/test\/\/\u6587\u4ef6\u5c5e\u4e8ezhangsan<\/p>\n
-rw-r--r--.1zhangsanzhangsan012\u67082305:59\/tmp\/test<\/p>\n
[root@localhost~]#userdel-rzhangsan\/\/\u5220\u6389zhangsan\u7528\u6237<\/p>\n
[root@localhost~]#ll\/tmp\/test\/\/\u6587\u4ef6\u7684\u6240\u6709\u8005\u548c\u6240\u5c5e\u7ec4\u5f04\u6210\u4e86uid\u548cgid<\/p>\n
-rw-r--r--.1504504012\u67082305:59\/tmp\/test<\/p>\n
\u8fd9\u65f6\u6211\u4eec\u4e5f\u53ef\u4ee5\u901a\u8fc7uid\u6216gid\u53bb\u67e5\u627e\u8fd9\u7c7b\u6587\u4ef6\u3002<\/p>\n
[root@localhost~]#find\/tmp-uid504-ls<\/p>\n
7971890-rw-r--r--1504504012\u67082312:12\/tmp\/test<\/p>\n
\u867d\u7136\u5bf9\u4e8e\u8fd9\u4e9b\u6b63\u5e38\u7684\u6240\u5c5e\u5173\u7cfb\u662f\u7528\u6237\u540d\u6216\u7ec4\u540d\u7684\u6587\u4ef6\uff0c\u540c\u6837\u4e5f\u53ef\u4ee5\u901a\u8fc7uid\u6216\u662fgid\u8fdb\u884c\u67e5\u627e\u3002\u4f8b\u5982\u7528\u6237student\u7684uid\u662f500\uff0c\u6211\u4eec\u901a\u8fc7uid\u5728\/home\u76ee\u5f55\u4e2d\u67e5\u627e\u5c5e\u4e8estudent\u7684\u6587\u4ef6\u3002<\/p>\n
[root@localhost~]#find\/home-uid500-ls<\/p>\n
4009034drwx------4studentstudent40969\u6708816:33\/home\/student<\/p>\n
rw-r--r--1studentstudent1761\u6708162015\/home\/student\/.bash_profile<\/p>\n
\u2026\u2026<\/p>\n
\u5bf9\u4e8e\/tmp\/test\u8fd9\u6837\u7684\u6240\u6709\u8005\u548c\u6240\u5c5e\u7ec4\u5f04\u6210\u4e86uid\u548cgid\u7684\u6587\u4ef6\uff0c\u5c31\u79f0\u4e3a\u6ca1\u6709\u6240\u6709\u8005\u6216\u6240\u5c5e\u7ec4\u7684\u6587\u4ef6linux\u8bbe\u7f6e\u9ed8\u8ba4\u7f51\u5173linux\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\uff0c\u8fd9\u6837\u7684\u6587\u4ef6\u5728\u7cfb\u7edf\u4e2d\u6709\u4e00\u5b9a\u5371\u9669\u6027\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7-nouser\u6216-nogroup\u9009\u9879\u53bb\u67e5\u627e\u8fd9\u7c7b\u6587\u4ef6\u3002\u627e\u5230\u8fd9\u7c7b\u6587\u4ef6\u4ee5\u540e\uff0c\u6700\u597d\u662f\u501f\u52a9chown\u547d\u4ee4\u91cd\u65b0\u4e3a\u5176\u6307\u5b9a\u6240\u6709\u8005\u548c\u6240\u5c5e\u7ec4\u3002<\/p>\n
[root@localhost~]#find\/tmp-nouser-ls<\/p>\n
7971890-rw-r--r--1504504012\u67082312:12\/tmp\/test<\/p>\n
[root@localhost~]#find\/tmp-nogroup-ls<\/p>\n
7971890-rw-r--r--1504504012\u67082312:12\/tmp\/test<\/p>\n
2.\u6309\u7167\u6587\u4ef6\u6743\u9650\u67e5\u627e<\/p>\n
\u6309\u6587\u4ef6\u6743\u9650\u67e5\u627e\uff0c\u987b\u8981\u7528\u5230-perm\u9009\u9879\uff0c\u4f9d\u636e\u5bf9\u6743\u9650\u7684\u8bbe\u7f6e\u6761\u4ef6\u4e0d\u540c\uff0c\u8be5\u9009\u9879\u53c8\u5206\u4e3a\u4e09\u79cd\u7528\u6cd5\uff1a<\/p>\n
l-permmode\uff1a\u7cbe\u786e\u5339\u914dmode\u6240\u8868\u793a\u7684\u6761\u4ef6\u3002<\/p>\n
l-perm\/mode\uff1a\u4efb\u4f55\u4e00\u7c7b\u7528\u6237\uff08ugo\uff09\u7684\u6743\u9650\u4e2d\u7684\u4efb\u4f55\u4e00\u4f4d\uff08rwx\uff09\u7b26\u5408mode\u6240\u8868\u793a\u7684\u6761\u4ef6\u5373\u53ef\uff0c9\u4f4d\u6743\u9650\u4e4b\u95f4\u5b58\u5728\u201c\u6216\u201d\u5173\u7cfb\u3002<\/p>\n
<\/p>\n
l-perm-mode\uff1a\u4efb\u4f55\u4e00\u7c7b\u7528\u6237\uff08ugo\uff09\u7684\u6743\u9650\u4e2d\u7684\u6bcf\u4e00\u4f4d\uff08rwx\uff09\u90fd\u8981\u540c\u65f6\u7b26\u5408mode\u6240\u8868\u793a\u7684\u6761\u4ef6\uff0c9\u4f4d\u6743\u9650\u4e4b\u95f4\u5b58\u5728\u201c\u4e0e\u201d\u5173\u7cfb\u3002<\/p>\n
\u6bd4\u5982\uff0c\u8981\u5728\/boot\u76ee\u5f55\u4e2d\u67e5\u627e\u6743\u9650\u4e3a755\u7684\u666e\u901a\u6587\u4ef6\uff0c\u5e76\u663e\u793a\u8be6\u5c3d\u4fe1\u606f\u3002\u6211\u4eec\u8bbe\u7f6e\u67e5\u627e\u6761\u4ef6\u4e3a\u201c-perm755\u201d\uff0c\u53ef\u4ee5\u53d1\u89c9\u5171\u627e\u5230\u4e24\u4e2a\u6587\u4ef6\uff0c\u8fd9\u4e24\u4e2a\u6587\u4ef6\u7684\u6743\u9650\u90fd\u5bf9\u67e5\u627e\u6761\u4ef6\u8fdb\u884c\u4e86\u7cbe\u786e\u5339\u914d\u3002<\/p>\n
[root@localhost~]#find\/boot-perm755-typef-ls<\/p>\n
65030250-rwxr-xr-x1rootroot2542484\u670872015\/boot\/efi\/EFI\/redhat\/grub.efi<\/p>\n
164125-rwxr-xr-x1rootroot42221927\u670822015\/boot\/vmlinuz-2.6.32-573.el6.x86_64<\/p>\n
\u4e0b\u8fb9\u7ee7\u7eed\u5728\/boot\u76ee\u5f55\u4e2d\u67e5\u627e\u6743\u9650\u4e3a750\u7684\u76ee\u5f55\uff0c\u5e76\u4e14\u6ca1\u6709\u67e5\u627e\u5230\u4efb\u4f55\u7b26\u5408\u6761\u4ef6\u7684\u7ed3\u679c\u3002<\/p>\n
[root@localhost~]#find\/boot-perm750-typed-ls<\/p>\n
\u5c06\u67e5\u627e\u6761\u4ef6\u66f4\u6539\u4e3a\u201c-perm\/750\u201d\uff0c\u8868\u793a\u4efb\u4f55\u4e00\u4e2a\u76ee\u5f55\u53ea\u8981\u5176\u6240\u6709\u8005\u5177\u6709\u8bfb\u5199\u6267\u884c\u4e2d\u7684\u4efb\u4f55\u4e00\u9879\u6743\u9650\uff0c\u6216\u662f\u5176\u6240\u5c5e\u7ec4\u5177\u6709\u8bfb\u548c\u6267\u884c\u4e2d\u7684\u4efb\u4f55\u4e00\u9879\u6743\u9650linux \u6587\u4ef6\u6267\u884c\u6743\u9650<\/strong>\uff0c\u5c31\u53ef\u4ee5\u7b26\u5408\u67e5\u627e\u6761\u4ef6\u3002\u987b\u8981\u6ce8\u610f\u7684\u662f\uff0c\u67e5\u627e\u6761\u4ef6\u4e2d\u76840\u8868\u793a\u5ffd\u89c6\u5bf9\u76f8\u5e94\u5bf9\u8c61\u7684\u6743\u9650\u8981\u6c42\uff0c\u800c\u4e0d\u662f\u6307\u6ca1\u6709\u4efb\u4f55\u6743\u9650\u3002\u91cd\u65b0\u6307\u5b9a\u67e5\u627e\u6761\u4ef6\u540e\uff0c\u5c31\u53ef\u4ee5\u627e\u5230\u597d\u591a\u7b26\u5408\u8981\u6c42\u7684\u76ee\u5f55\u3002<\/p>\n [root@localhost~]#find\/boot-perm\/750-typed-ls<\/p>\n 22dr-xr-xr-x5rootroot10249\u6708200:36\/boot<\/p>\n 1113drwx------2rootroot122889\u6708200:24\/boot\/lost+found<\/p>\n 650272drwxr-xr-x3rootroot10249\u6708200:33\/boot\/efi<\/p>\n \u2026\u2026<\/p>\n \u4e0b\u8fb9\u518d\u5c06\u67e5\u627e\u6761\u4ef6\u66f4\u6539\u4e3a\u201c-perm-750\u201d\uff0c\u8868\u793a\u6240\u8981\u67e5\u627e\u7684\u76ee\u5f55\u5176\u6240\u6709\u8005\u5fc5\u987b\u5177\u6709\u8bfb\u5199\u6267\u884c\u6743\u9650\uff0c\u540c\u65f6\u5176\u6240\u5c5e\u7ec4\u5fc5\u987b\u5177\u6709\u8bfb\u548c\u6267\u884c\u6743\u9650\uff0c\u5bf9\u5176\u4ed6\u7528\u6237\u7684\u6743\u9650\u6ca1\u6709\u8981\u6c42\u3002\u4ece\u67e5\u627e\u7ed3\u679c\u4e2d\u53ef\u4ee5\u53d1\u89c9\uff0c\u4e4b\u524d\u901a\u8fc7\u6761\u4ef6\u201c-perm\/750\u201d\u6240\u67e5\u627e\u4e0b\u6765\u7684\u4e24\u4e2a\u76ee\u5f55\u201c\/boot\u201d\u548c\u201c\/boot\/lost+found\u201d\uff0c\u6b64\u65f6\u90fd\u4e0d\u5728\u67e5\u627e\u7ed3\u679c\u4e4b\u5217\u3002<\/p>\n [root@localhost~]#find\/boot-perm-750-typed-ls<\/p>\n 650272drwxr-xr-x3rootroot10249\u6708200:33\/boot\/efi<\/p>\n 650282drwxr-xr-x3rootroot10249\u6708200:33\/boot\/efi\/EFI<\/p>\n 650292drwxr-xr-x2rootroot10249\u6708200:33\/boot\/efi\/EFI\/redhat<\/p>\n \u6240\u4ee5\u5047\u5982\u8981\u5728\u7cfb\u7edf\u4e2d\u67e5\u627e\u6240\u6709\u4eba\u90fd\u6709\u5199\u6743\u9650\u7684\u76ee\u5f55\uff0c\u5219\u5e94\u5f53\u6307\u5b9a\u6761\u4ef6\u201c-perm-222\u201d\uff0c\u5047\u5982\u4ee5\u201c-perm\/222\u201d\u4e3a\u67e5\u627e\u6761\u4ef6\uff0c\u5219\u662f\u6240\u6709\u8005\u3001\u6240\u5c5e\u7ec4\u6216\u5176\u4ed6\u7528\u6237\u4e2d\u4efb\u4f55\u4e00\u4e2a\u5177\u6709\u5199\u6743\u9650\u5c31\u4f1a\u7b26\u5408\u8981\u6c42\u3002<\/p>\n [root@localhost~]#find\/-perm-222-typed-ls2>\/dev\/null<\/p>\n 68100drwxrwxrwt2rootroot10012\u67082303:37\/dev\/shm<\/p>\n 6541084drwxrwxrwt2rootroot409612\u67082303:42\/var\/tmp<\/p>\n 7848974drwxrwxrwt12rootroot409612\u67082306:58\/tmp<\/p>\n \u2026\u2026<\/p>\n \u4e0d\u4ec5\u8bfb\u5199\u6267\u884c\u8fd9\u79cd\u5e38\u89c4\u6743\u9650\u4e4b\u5916\uff0cLinux\u7cfb\u7edf\u8fd8\u63d0\u4f9b\u4e86\u7279\u6b8a\u6743\u9650SUID\u548cSGID\uff0c\u5b83\u4eec\u6240\u5bf9\u5e94\u7684\u6570\u5b57\u5206\u522b\u662f4\u548c2\u3002\u5047\u5982\u8981\u5728\u7cfb\u7edf\u4e2d\u67e5\u627e\u6240\u6709\u8bbe\u7f6e\u4e86SUID\u7684\u6587\u4ef6\uff0c\u5e94\u6307\u5b9a\u6761\u4ef6\u201c-perm-4000\u201d\u3002<\/p>\n [root@localhost~]#find\/-perm-4000\u2013ls2>\/dev\/null<\/p>\n 78897640-rwsr-xr-x1rootroot3820012\u6708112014\/bin\/ping<\/p>\n 78899076-rwsr-xr-x1rootroot773368\u6708112014\/bin\/mount<\/p>\n \u2026\u2026<\/p>\n \u5047\u5982\u8981\u67e5\u627e\u6240\u6709\u8bbe\u7f6e\u4e86SGID\u7684\u6587\u4ef6\uff0c\u5e94\u6307\u5b9a\u6761\u4ef6\u201c-perm-2000\u201d\u3002<\/p>\n [root@localhost~]#find\/-perm-2000\u2013ls2>\/dev\/null<\/p>\n 78494416-rwxr-sr-x1rootcgred163841\u670862015\/bin\/cgexec<\/p>\n 78497116-rwxr-sr-x1rootcgred163521\u670862015\/bin\/cgclassify<\/p>\n \u2026\u2026<\/p>\n \u5047\u5982\u8981\u540c\u65f6\u67e5\u627e\u6240\u6709\u8bbe\u7f6e\u4e86SUID\u6216\u662fSGID\u7684\u6587\u4ef6linux \u6587\u4ef6\u6267\u884c\u6743\u9650<\/strong>\uff0c\u8fd9\u4e48\u5e94\u5f53\u6307\u5b9a\u6761\u4ef6\u201c-perm\/6000\u201d\uff0c\u5018\u82e5\u5c06\u6761\u4ef6\u6307\u5b9a\u4e3a\u201c-perm-6000\u201d\uff0c\u5219\u8868\u793a\u67e5\u627e\u65e2\u8bbe\u7f6e\u4e86SUID\u4e5f\u8bbe\u7f6e\u4e86SGID\u7684\u6587\u4ef6\uff0c\u800c\u8fd9\u6837\u7684\u6587\u4ef6\u5728\u7cfb\u7edf\u4e2d\u662f\u4e0d\u5b58\u5728\u7684\u3002<\/p>\n [root@localhost~]#find\/-perm-6000\u2013ls2>\/dev\/null<\/p>\n \/\/\u67e5\u627e\u540c\u65f6\u8bbe\u7f6e\u4e86SUID\u548cSGID\u7684\u6587\u4ef6\uff0c\u6ca1\u6709\u7ed3\u679c\u3002<\/p>\n [root@localhost~]#find\/-perm\/6000\u2013ls2>\/dev\/null<\/p>\n \/\/\u67e5\u627e\u8bbe\u7f6e\u4e86SUID\u6216\u662fSGID\u7684\u6587\u4ef6<\/p>\n 78897640-rwsr-xr-x1rootroot3820012\u6708112014\/bin\/ping<\/p>\n 78899076-rwsr-xr-x1rootroot773368\u6708112014\/bin\/mount<\/p>\n \u2026\u2026<\/p>\n","protected":false},"excerpt":{"rendered":" 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