{"id":200,"date":"2021-07-28T10:56:19","date_gmt":"2021-07-28T02:56:19","guid":{"rendered":"http:\/\/egonlin.com\/?p=200"},"modified":"2024-03-16T14:37:39","modified_gmt":"2024-03-16T06:37:39","slug":"%e7%ac%ac%e4%ba%8c%e8%8a%82%ef%bc%9a%e6%96%87%e4%bb%b6%e6%9d%83%e9%99%90%e7%ae%a1%e7%90%86","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=200","title":{"rendered":"\u7b2c\u4e8c\u8282\uff1a\u6587\u4ef6\u6743\u9650\u7ba1\u7406"},"content":{"rendered":"<h1>\u6743\u9650\u7ba1\u7406-\u6587\u4ef6\u6743\u9650<\/h1>\n<p>\u628a\u4e00\u4e2a\u7528\u6237\u52a0\u5165\u4e86\u4e00\u4e2a\u7ec4\uff0c\u8be5\u7528\u6237\u5c31\u62e5\u6709\u4e86\u8be5\u7ec4\u7684\u6743\u9650\uff0c\u5f53\u4e00\u4e2a\u7528\u6237\u8981\u64cd\u4f5c\u67d0\u4e2a\u6587\u4ef6\u65f6\uff0c\u7cfb\u7edf\u4f1a\u4f9d\u6b21\u68c0\u7d22\u8be5\u7528\u6237\u662f\u5426\u662f\u8be5\u6587\u4ef6\u7684\u62e5\u6709\u8005\uff0c\u5176\u6b21\u662f\u7ec4\u6210\u5458\uff0c\u6700\u540e\u662f\u5176\u4ed6\u4eba\uff0c\u5982\u679c\u626b\u63cf\u5230\u662f\u62e5\u6709\u8005\uff0c\u5219\u5177\u5907\u62e5\u6709\u8005\u7684\u6743\u9650\uff0c\u4e0d\u5fc5\u5f80\u540e\u626b\u63cf\uff0c\u4ee5\u6b64\u7c7b\u63a8<\/p>\n<h2>\u4e00 \u6587\u4ef6\u6743\u9650\u7ba1\u7406\u4e4b\u57fa\u672c\u6743\u9650<\/h2>\n<h3>1.1 \u57fa\u672c\u6743\u9650\u4ecb\u7ecd<\/h3>\n<p>\u57fa\u672c\u6743\u9650\u7c7b\u578b<\/p>\n<ul>\n<li>r\uff1a\u53ef\u8bfb=\u300b4<\/li>\n<li>w\uff1a\u53ef\u5199=\u300b2<\/li>\n<li>x\uff1a\u53ef\u6267\u884c=\u300b1<\/li>\n<\/ul>\n<p>\u6743\u9650\u7684\u5f52\u5c5e<\/p>\n<ul>\n<li>\u5c5e\u4e3b\uff1au<\/li>\n<li>\u5c5e\u7ec4\uff1ag<\/li>\n<li>\u5176\u4ed6\u4eba\uff1ao<\/li>\n<\/ul>\n<p>\u4f8b\u5982<\/p>\n<pre><code class=\"language-python\">[root@aliyun ~]# ls -l a.txt\n-rw-r--r-- 1 root root 1146 Jul 16 18:42 a.txt\n\n\u6587\u4ef6\u7c7b\u578b\uff1a\n    -\uff1a\u6587\u672c\u6587\u6863\n    d\uff1a\u76ee\u5f55\n    b\uff1a\u8bbe\u5907block\n    c\uff1a\u5b57\u7b26\u8bbe\u5907\n    s\uff1a\u5957\u63a5\u5b57\u6587\u4ef6\n    l\uff1a\u8f6f\u94fe\u63a5\n\n\u6743\u9650\n\n\u786c\u94fe\u63a5\u4e2a\u6570\n\n\u5c5e\u4e3b\n\n\u5c5e\u7ec4\n\n\u6587\u4ef6\u6240\u5360\u7528\u7684\u7a7a\u95f4(\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d)\n\n\u6587\u4ef6\uff08\u76ee\u5f55\uff09\u6700\u8fd1\u8bbf\u95ee\uff08\u4fee\u6539\uff09\u65f6\u95f4\n\n\u6587\u4ef6\u540d<\/code><\/pre>\n<h3>1.2 \u8bbe\u7f6e\u6743\u9650<\/h3>\n<p>\u4fee\u6539\u5c5e\u4e3b\u3001\u5c5e\u7ec4<\/p>\n<pre><code class=\"language-python\">[root@aliyun ~]# chown alice.hr file1           # \u6539\u5c5e\u4e3b\u3001\u5c5e\u7ec4\n[root@aliyun ~]# chown alice        file1       # \u53ea\u6539\u5c5e\u4e3b\n[root@aliyun ~]# chown        .hr   file1       # \u53ea\u6539\u5c5e\u7ec4\n\n[root@aliyun ~]# chown -R \/test  # \u9012\u5f52\u4fee\u6539<\/code><\/pre>\n<p>\u4fee\u6539u\u3001g\u3001o\u5bf9\u5e94\u7684\u6743\u9650<\/p>\n<pre><code class=\"language-python\"># \u52a0\u51cf\u6cd5\nchmod u+x,g-w,o+r a.txt\n# \u8d4b\u503c\nchmod a=rwx a.txt\nchmod a=- a.txt\nchmod ug=rw,o=r file1\n\n# \u6570\u5b57\nchmod 644 file1\n\nchmod -R 777 xxx\/<\/code><\/pre>\n<p>\u6ce8\u610f\uff1a\u628a\u67d0\u4e00\u4e2a\u975e\u5c5e\u4e3b\u7528\u6237\u6dfb\u52a0\u5230\u6587\u4ef6\u7684\u5c5e\u7ec4\u91cc\uff0c\u4ed6\u5c31\u62e5\u6709\u4e86\u8be5\u7ec4\u7684\u6743\u9650\uff0c\u800c\u4e0d\u518d\u662f\u5176\u4ed6\u4eba<\/p>\n<h3>1.3 \u6743\u9650\u5bf9\u6587\u4ef6or\u76ee\u5f55\u7684\u610f\u4e49<\/h3>\n<p>\u6587\u4ef6\uff1als -l \u6587\u4ef6\u540d<\/p>\n<ul>\n<li>r\uff1a\u53ef\u4ee5cat\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/li>\n<li>w\uff1a\u53ef\u4ee5\u4fee\u6539\u6587\u4ef6<\/li>\n<li>x\uff1a\u53ef\u4ee5\u6267\u884c\u6587\u4ef6\u4ee3\u7801\uff0c\u5982\u679c\u8be5\u6587\u4ef6\u7684\u4ee3\u7801\u662f\u7f16\u8bd1\u597d\u7684\u7ed3\u679c\uff0c\u90a3\u4e48\u53ea\u6709x\u6743\u9650\u5373\u53ef\u6267\u884c\uff0c\u4f46\u5982\u679c\u8be5\u6587\u4ef6\u7684\u4ee3\u7801\u662f\u4e00\u4e2a\u89e3\u91ca\u578b\u7684\u811a\u672c\u7a0b\u5e8f\uff0c\u5219\u9700\u8981\u914d\u5408r\u6743\u9650\u624d\u53ef\u6267\u884c<\/li>\n<\/ul>\n<p>\u76ee\u5f55\uff1als -dl \u6587\u4ef6\u540d<\/p>\n<ul>\n<li>r\uff1a \u53ef\u4ee5ls\u6d4f\u89c8\u6587\u4ef6\u4e0b\u7684\u5185\u5bb9<\/li>\n<li>w\uff1a\u53ef\u4ee5\u5728\u76ee\u5f55\u4e0b\u521b\u5efa\u65b0\u6587\u4ef6or\u76ee\u5f55<\/li>\n<li>x\uff1a\n<ul>\n<li>\u53ef\u4ee5\u6267\u884c\u76ee\u5f55\u4e0b\u7684\u7a0b\u5e8f\uff0c\u9664\u4e86\u5bf9\u76ee\u5f55\u6709\u6267\u884c\u6743\u9650\u5916\uff0c\u8fd8\u8981\u5bf9\u7a0b\u5e8f\u6587\u4ef6\u6709\u6267\u884c\u6743\u9650\u624d\u884c\u3002<\/li>\n<li>\u53ef\u4ee5\u6b63\u5e38\u5207\u6362\u5230\u76ee\u5f55\u4e0b<\/li>\n<li>\u6d89\u53ca\u5230\u591a\u5c42\u76ee\u5f55\u5982\/a\/b\/c\uff0c\u9700\u8981\u5bf9\u6bcf\u4e00\u7ea7\u90fd\u6709x\u6743\u9650\u624d\u53ef\u4ee5\u6b63\u5e38\u8d70\u5230\u4e0b\u4e00\u7ea7<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre><code class=\"language-python\">\u4e00\uff1a\u5bf9\u6587\u4ef6\u5939\u7684\u64cd\u4f5c(\u4e0d\u64cd\u4f5c\u6587\u4ef6\u5185\u5bb9)\uff0c\u9700\u8981\u5f53\u524d\u7528\u6237\u5177\u5907\u7684\u6743\u9650\n    1\u3001\u5bf9\u6cbf\u9014\u6240\u6709\u6587\u4ef6\u5939\u6709x\u6743\u9650\n    2\u3001\u5bf9\u76ee\u6807\u6587\u4ef6\u5939\u6709r\u6216w\u6743\u9650\n        r-\u300b\u53ef\u4ee5\u6d4f\u89c8\n        w-\u300b\u53ef\u4ee5\u521b\u5efa\u3001\u5220\u9664\u3001\u79fb\u52a8\u5b50\u6587\u4ef6\u548c\u5b50\u76ee\u5f55\n\n\u4e8c\uff1a\u5bf9\u6587\u4ef6\u7684\u64cd\u4f5c(\u64cd\u4f5c\u6587\u4ef6\u5185\u5bb9)\uff0c\u9700\u8981\u5f53\u524d\u7528\u6237\u5177\u5907\u7684\u6743\u9650\n    1\u3001\u5bf9\u6cbf\u9014\u6240\u6709\u6587\u4ef6\u5939\u6709x\u6743\u9650\n    2\u3001\u5bf9\u76ee\u6807\u6587\u4ef6\u6709r\u6216w\u6743\u9650\n        r-\u300b\u53ef\u4ee5\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\n        w-\u300b\u53ef\u4ee5\u4fee\u6539\u6587\u4ef6\u5185\u5bb9\n\n\uff01\uff01\uff01\u6ce8\u610f\uff01\uff01\uff01\n\u50a8\u5907\u77e5\u8bc6\uff1avim\u4fee\u6539\u7684\u539f\u7406\u662f\u5c06\u6e90\u6587\u4ef6\u5220\u6389\uff0c\u7136\u540e\u518d\u5c06\u5185\u5bb9\u7684\u5185\u5bb9\u8986\u76d6\u5199\u5165\u4e86\u65b0\u6587\u4ef6\uff0c\u65b0\u6587\u4ef6\u540d\u91cd\u547d\u540d\u4e3a\u539f\u6587\u4ef6\u540d\n\u4f8b\u5b50\uff1a\n1\u3001\u5f53\u524d\u7528\u6237\u5bf9\u6cbf\u9014\u6240\u6709\u6587\u4ef6\u5939\u90fd\u6709x\u6743\u9650\n2\u3001\u5e76\u4e14\u5f53\u524d\u7528\u6237\u5bf9\u76ee\u6807\u6587\u4ef6\u5939\u6709w\u6743\u9650\n3\u3001\u4f46\u662f\u5f53\u524d\u7528\u6237\u5bf9\u76ee\u6807\u6587\u4ef6\u6ca1\u6709w\u6743\u9650\n\u6b64\u65f6\u5f53\u524d\u7528\u53ef\u4ee5vim\u7f16\u8f91\u6587\u4ef6\u5185\u5bb9\uff0c\u5e76\u4e14\u53ef\u4ee5wq!\u5f3a\u5236\u4fdd\u5b58\uff08\u8f93\u5165y\u786e\u8ba4\uff09\u9000\u51fa\u5b8c\u6210\u6587\u4ef6\u4fee\u6539\uff0c\u5176\u5b9e\u662f\u5c06\u6e90\u6587\u4ef6\u5220\u6389\u4e86\uff0c\u53ef\u4ee5\u901a\u8fc7\u67e5\u770b\u524d\u540e\u64cd\u4f5c\u7684\u6587\u4ef6inode\u53f7\u6765\u786e\u5b9a<\/code><\/pre>\n<p>\u4f8b1\uff1a\u8981\u60f3\u5728\u76ee\u5f55\u4e0b\u521b\u5efa\\\u5220\u9664\u5185\u5bb9\uff1a\u5bf9\u76ee\u5f55\u7684x\u6743\u9650+\u5bf9\u76ee\u5f55\u7684w\u6743\u9650<\/p>\n<pre><code class=\"language-python\"># 1\u3001\u8bbe\u7f6e\u6743\u9650\n[root@aliyun ~]# mkdir -p \/a\/b\/c\n[root@aliyun ~]# chmod -R o=x \/a  # \u5176\u4ed6\u4ebao\u5bf9\u5f53\u524d\u76ee\u5f55\u53ca\u5176\u5b50\u76ee\u5f55\u90fd\u6709x\u6743\u9650\n[root@aliyun ~]# chmod o+w \/a\/b\/c # \u5176\u4ed6\u4ebao\u5bf9\/a\/b\/c\u76ee\u5f55\u6709w\u6743\u9650\n\n# 2\u3001\u67e5\u770b\u6743\u9650\n[root@aliyun ~]# ls -dl \/a\ndrwxr-x--x 3 root root 4096 Aug 11 16:24 \/a\n[root@aliyun ~]# ls -dl \/a\/b\ndrwxr-x--x 3 root root 4096 Aug 11 16:24 \/a\/b\n[root@aliyun ~]# ls -dl \/a\/b\/c\ndrwxr-x-wx 2 root root 4096 Aug 11 16:25 \/a\/b\/c\n\n# 3\u3001\u9a8c\u8bc1\n[root@aliyun ~]# \n[root@aliyun ~]# su - gg\nLast login: Tue Aug 11 16:17:28 CST 2020 on pts\/2\n[gg@aliyun ~]$ touch \/a\/b\/c\/1.txt\n[gg@aliyun ~]$ exit\nlogout\n[root@aliyun ~]# ls \/a\/b\/\/c\/\n1.txt<\/code><\/pre>\n<p>\u4f8b2\uff1a\u8981\u6d4f\u89c8\u76ee\u5f55\u4e0b\u5185\u5bb9\uff1a\u5bf9\u76ee\u5f55\u7684x\u6743\u9650+\u5bf9\u76ee\u5f55\u7684r\u6743\u9650<\/p>\n<pre><code class=\"language-python\">[root@aliyun ~]# mkdir -p \/a\/b\/c\n[root@aliyun ~]# chmod -R o=x \/a\n[root@aliyun ~]# chmod o+r \/a\/b\/c\n[root@aliyun ~]# \n[root@aliyun ~]# touch \/a\/b\/c\/{1..3}.txt\n[root@aliyun ~]# \n[root@aliyun ~]# su - gg\nLast login: Tue Aug 11 16:27:33 CST 2020 on pts\/2\n[gg@aliyun ~]$ ls \/a\/b\/c\n1.txt  2.txt  3.txt<\/code><\/pre>\n<p>\u4f8b3\uff1a\u8981\u6267\u884c\u76ee\u5f55\u4e0b\u7a0b\u5e8f\uff1a\u5bf9\u76ee\u5f55\u7684x\u6743\u9650+\u5bf9\u6587\u4ef6\u7684x\u6743\u9650\uff0c\u5982\u679c\u6587\u4ef6\u662f\u89e3\u91ca\u578b\u8bed\u8a00\u7684\u811a\u672c\u7a0b\u5e8f\uff0c\u8fd8\u9700\u8981\u5bf9\u6587\u4ef6\u6709r\u6743\u9650<\/p>\n<pre><code class=\"language-python\">[root@aliyun ~]# mkdir -p \/a\/b\/c\n[root@aliyun ~]# chmod -R o=x \/a\/b\/c\n[root@aliyun ~]# cp \/bin\/echo \/a\/b\/c\n[root@aliyun ~]# chmod o=x \/a\/b\/c\/echo\n[root@aliyun ~]# \n[root@aliyun ~]# su - gg\nLast login: Tue Aug 11 16:30:17 CST 2020 on pts\/2\n[gg@aliyun ~]$ \/a\/b\/c\/echo &quot;hello egon&quot;\nhello egon<\/code><\/pre>\n<h2>\u4e8c \u6587\u4ef6\u6743\u9650\u7ba1\u7406\u4e4b\u7279\u6b8a\u6743\u9650<\/h2>\n<p>\u8be6\u89e3\uff1a<a href=\"https:\/\/www.cnblogs.com\/linhaifeng\/articles\/13357542.html\">https:\/\/www.cnblogs.com\/linhaifeng\/articles\/13357542.html<\/a><\/p>\n<p>suid    4<br \/>\nsgid        2<br \/>\nsticky  1<\/p>\n<h3>2.1 SUID<\/h3>\n<p>\u666e\u901a\u7528\u6237\u4e0d\u662froot\u4e5f\u4e0d\u5c5e\u4e8eroot\u7ec4\uff0c\u4e8e\u662f\u5b83\u5bf9\/etc\/shadow\u6587\u4ef6\u6ca1\u6709\u4efb\u4f55\u6743\u9650<\/p>\n<pre><code class=\"language-python\">[root@aliyun ~]# ll \/etc\/shadow\n---------- 1 root root 1109 Aug 11 16:11 \/etc\/shadow<\/code><\/pre>\n<p>\u4f46\u662f\u666e\u901a\u7528\u6237\u5374\u53ef\u4ee5\u7528passwd\u547d\u4ee4\u4fee\u6539\u5bc6\u7801\uff0c\u800c\u4fee\u6539\u5bc6\u7801\u90fd\u662f\u5728\u4fee\u6539\/etc\/shadow\u6587\u4ef6\uff0c\u5982\u4f55\u5b9e\u73b0\u7684\uff1f\uff1f\uff1f<\/p>\n<pre><code class=\"language-python\">[root@aliyun ~]# ll `which passwd`\n-rwsr-xr-x 1 root root 27856 Aug  9  2019 \/bin\/passwd<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\u4e00\u4e2as\u6743\u9650\uff0cs\u6743\u9650\u7684\u7279\u6b8a\u4e4b\u5904<\/p>\n<ul>\n<li>SUID \u6743\u9650\u4ec5\u5bf9\u4e8c\u8fdb\u5236\u53ef\u6267\u884c\u6587\u4ef6\u6709\u6548<\/li>\n<li>\u5982\u679c\u6267\u884c\u8005\u5bf9\u4e8e\u8be5\u4e8c\u8fdb\u5236\u53ef\u6267\u884c\u6587\u4ef6\u5177\u6709 x \u7684\u6743\u9650\uff0c\u6267\u884c\u8005\u5c06\u5177\u6709\u8be5\u6587\u4ef6\u7684\u6240\u6709\u8005\u7684\u6743\u9650<\/li>\n<li>\u672c\u6743\u9650\u4ec5\u5728\u6267\u884c\u8be5\u4e8c\u8fdb\u5236\u53ef\u6267\u884c\u6587\u4ef6\u7684\u8fc7\u7a0b\u4e2d\u6709\u6548<\/li>\n<\/ul>\n<p>\u793a\u4f8b<\/p>\n<pre><code class=\"language-python\">[root@localhost ~]# ll `which cat`\n-rwxr-xr-x. 1 root root 54160 10\u6708 31 2018 \/usr\/bin\/cat\n[root@localhost ~]# chmod 4755 `which cat`  # \u6216\u8005 chmod u+s `which cat`\n[root@localhost ~]# ll `which cat`\n-rwsr-xr-x. 1 root root 54160 10\u6708 31 2018 \/usr\/bin\/cat\n\n[root@localhost ~]# su - egon\n[egon@localhost ~]$ cat \/etc\/shadow  # \u53ef\u4ee5\u770b\u5230\u5185\u5bb9<\/code><\/pre>\n<p>\u4e86\u89e3\uff1a<\/p>\n<pre><code class=\"language-python\"># 1\u3001\u5728\u6ca1\u6709\u8bbe\u7f6esuid\u7684\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u767b\u5f55\u4e86\u4e00\u4e2a\u7528\u6237\uff0c\u6765\u6267\u884c\u64cd\u4f5c\u76ee\u6807\u6587\u4ef6\u7684\u547d\u4ee4\n\u4f1a\u4f9d\u6b21\u6bd4\u5bf9\u5f53\u524d\u767b\u5f55\u7528\u6237\u662f\u5426\u662f\u76ee\u6807\u6587\u4ef6\u7684\u5c5e\u4e3b\u3001\u5c5e\u7ec4\u3001\u5176\u4ed6\u4eba\u6765\u786e\u5b9a\u662f\u5426\u62e5\u6709\u64cd\u4f5c\u6743\u9650\n\n# 2\u3001\u5728\u8bbe\u7f6e\u4e86suid\u7684\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u767b\u5f55\u4e86\u4e00\u4e2a\u7528\u6237\uff0c\u6765\u6267\u884c\u64cd\u4f5c\u76ee\u6807\u6587\u4ef6\u7684\u547d\u4ee4\n\u5f53\u524d\u7528\u6237\u4f1a\u8f6c\u6362\u6210\u547d\u4ee4\u6587\u4ef6\u7684\u5c5e\u4e3b\u8eab\u4efd\uff0c\u7136\u540e\u62ff\u7740\u8be5\u8eab\u4efd\u53bb\u5bf9\u5e94\u76ee\u6807\u6587\u4ef6\uff0c\u5982\u679c\u8be5\u8eab\u4efd\u4e0d\u662f\u76ee\u6807\u6587\u4ef6\u7684\u4e3b\u4eba\uff0c\u90a3\u4e48\u5c31\u76f4\u63a5\u88ab\u5f52\u4e3a\u5176\u4ed6\u4eba\u4e00\u680f\uff0c\u4e0d\u4f1a\u68c0\u7d22\u7ec4\nsgid\u4e00\u6837<\/code><\/pre>\n<p>\u4f8b<\/p>\n<pre><code class=\"language-python\"># \u51c6\u5907\nmkdir \/test\nchmod 777 \/test\/\necho 1111 &gt; \/test\/a.txt\nchmod 000 \/test\/a.txt\nchown user1.group1 \/test\/a.txt\nchown egon.devops \/usr\/bin\/cat\nchmod u+s \/usr\/bin\/cat\n\n# \u5b9e\u9a8c\n[root@egon ~]# ll \/test\/a.txt  # \u76ee\u6807\u6587\u4ef6\u7684\u5c5e\u4e3b:user1\uff0c\u5c5e\u7ec4:group1\n----------. 1 user1 group1 4 10\u6708 29 18:31 \/test\/a.txt\n[root@egon ~]# \n[root@egon ~]# \n[root@egon ~]# ll \/usr\/bin\/cat # \u547d\u4ee4\u6587\u4ef6\u7684\u5c5e\u4e3b\uff1aegon\n-rwxr-xr-x. 1 egon devops 54160 10\u6708 31 2018 \/usr\/bin\/cat\n[root@egon ~]# \n[root@egon ~]# \n[root@egon ~]# su - lili -c &quot;cat \/test\/a.txt&quot;  # lili\u5207\u6362\u4e3aegon\u7528\u6237\u6267\u884c\uff0cegon\u7528\u6237\u6ca1\u6709\u5bf9\u4e0aa.txt\u7684\u5c5e\u4e3b\uff0c\u6240\u4ee5\u76f4\u63a5\u88ab\u5f53\u6210\u5176\u4ed6\u4eba\uff0c\u6ca1\u6709\u4efb\u4f55\u6743\u9650\ncat: \/test\/a.txt: \u6743\u9650\u4e0d\u591f\n[root@egon ~]# chmod o+r \/test\/a.txt\n[root@egon ~]# su - lili -c &quot;cat \/test\/a.txt&quot; \n111\n[root@egon ~]# \n[root@egon ~]# \n[root@egon ~]# chmod o-r,g+r \/test\/a.txt\n[root@egon ~]# ll \/test\/a.txt\n----r-----. 1 user1 group1 4 10\u6708 29 18:31 \/test\/a.txt\n[root@egon ~]# usermod -a -G group1 egon\n[root@egon ~]# ll \/usr\/bin\/cat  # \u786e\u4fddsuid\u8fd8\u5728\n-rwsr-xr-x. 1 egon devops 54160 10\u6708 31 2018 \/usr\/bin\/cat\n[root@egon ~]# id egon\nuid=1005(egon) gid=1005(egon) \u7ec4=1005(egon),1003(group1)\n[root@egon ~]# \n[root@egon ~]# su - lili -c &quot;cat \/test\/a.txt&quot;  # lili---&gt;egon,egon\u7528\u6237\u6ca1\u6709\u5bf9\u4e0aa.txt\u7684\u5c5e\u4e3b\uff0c\u6240\u4ee5\u76f4\u63a5\u88ab\u5f53\u6210\u5176\u4ed6\u4eba\uff0c\u867d\u7136\u6b64\u65f6egon\u5c5e\u4e8e\u6587\u4ef6a.txt\u7684\u5c5e\u7ec4group1\u7684\u6210\u5458\uff0c\u4f46\u662f\u5bf9suid\u6765\u8bf4\u90a3\u6ca1\u7528\ncat: \/test\/a.txt: \u6743\u9650\u4e0d\u591f\n[root@egon ~]# \n\n[root@egon ~]# su - egon -c &quot;cat \/test\/a.txt&quot;  # \u5982\u679c\u5f53\u524d\u7528\u6237\u4e0esuid\u7684\u7528\u6237\u91cd\u53e0\uff0c\u90a3\u4e48\u5c31\u65e0\u6240\u8c13\u7528\u6237\u8f6c\u6362\uff0c\u540c\u6837\u4f1a\u6309\u7167\uff1a\u5c5e\u4e3b\u3001\u5c5e\u7ec4\u3001\u5176\u4ed6\u4eba\u7684\u6b21\u5e8f\u4f9d\u6b21\u5bf9\u7167\n1111\n\n# \u6ce8\u610f\uff1a\nsgid\u89c4\u5219\u540csuid\n\u540c\u65f6\u8bbe\u7f6esuid\u4e0esgid\u7684\u60c5\u51b5\u4e0b\uff0csuid\u4f18\u5148\u7ea7\u9ad8\u4e8esguid<\/code><\/pre>\n<h3>2.2 SGID<\/h3>\n<ul>\n<li>\n<p>\u5f53SGID \u4f5c\u7528\u4e8e\u666e\u901a\u6587\u4ef6\u65f6\uff0c\u548c SUID \u7c7b\u4f3c\uff0c\u5728\u6267\u884c\u8be5\u6587\u4ef6\u65f6\uff0c\u7528\u6237\u5c06\u83b7\u5f97\u8be5\u6587\u4ef6\u6240\u5c5e\u7ec4\u7684\u6743\u9650\u3002<\/p>\n<\/li>\n<li>\n<p>\u5f53 SGID \u4f5c\u7528\u4e8e\u76ee\u5f55\u65f6\uff0c\u610f\u4e49\u5c31\u975e\u5e38\u91cd\u5927\u4e86\uff1a<\/p>\n<p><strong>\u5f53\u4e00\u4e2a\u7528\u6237\u5bf9\u67d0\u4e00\u76ee\u5f55\u6709\u5199\u548c\u6267\u884c\u6743\u9650\u65f6\uff0c\u8be5\u7528\u6237\u5c31\u53ef\u4ee5\u5728\u8be5\u76ee\u5f55\u4e0b\u5efa\u7acb\u6587\u4ef6<\/strong><\/p>\n<p><strong>\u5982\u679c\u8be5\u76ee\u5f55\u540c\u65f6\u7528 SGID \u4fee\u9970\uff0c\u5219\u8be5\u7528\u6237\u5728\u8fd9\u4e2a\u76ee\u5f55\u4e0b\u5efa\u7acb\u7684\u6587\u4ef6\u90fd\u662f\u5c5e\u4e8e\u8fd9\u4e2a\u76ee\u5f55\u6240\u5c5e\u7684\u7ec4\u3002<\/strong><\/p>\n<pre><code class=\"language-python\">[root@localhost ~]# mkdir \/test\n[root@localhost ~]# chmod g+s \/test\/  # \u7b49\u540c\u4e8echmod 2755 \/test\/\n[root@localhost ~]# ll -dl \/test\/\ndrwxr-sr-x 2 root root 6 8\u6708  11 17:06 \/test\/\n[root@localhost ~]# \n[root@localhost ~]# chown .egon \/test\/  # \u540e\u671f\u4efb\u4f55\u4eba\u5728\u8be5\u76ee\u5f55\u4e0b\u521b\u5efa\u7684\u6587\u4ef6or\u76ee\u5f55\u7684\u5c5e\u7ec4\u90fd\u662fegon<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>2.3 SBIT<\/h3>\n<p>\u5176\u5b9e SBIT \u4e0e SUID \u548c SGID \u7684\u5173\u7cfb\u5e76\u4e0d\u5927\u3002<br \/>\n<strong>SBIT \u662f the  restricted  deletion  flag  or  sticky  bit \u7684\u7b80\u79f0\uff0c\u6709\u65f6\u4e5f\u79f0\u4e3aSticky\u3002<\/strong><br \/>\nSBIT \u76ee\u524d\u53ea\u5bf9\u76ee\u5f55\u6709\u6548\uff0c\u7528\u6765\u963b\u6b62\u975e\u6587\u4ef6\u7684\u6240\u6709\u8005\u5220\u9664\u6587\u4ef6\u3002\u6bd4\u8f83\u5e38\u89c1\u7684\u4f8b\u5b50\u5c31\u662f \/tmp \u76ee\u5f55\uff1a<\/p>\n<pre><code class=\"language-python\">[root@localhost ~]# ls -dl \/tmp\/\ndrwxrwxrwt. 13 root root 4096 8\u6708  11 17:09 \/tmp\/\n[root@localhost ~]# chmod o+t \/test\/   # \u6216\u8005 chmod 1755 \/test<\/code><\/pre>\n<p>\u6743\u9650\u4fe1\u606f\u4e2d\u6700\u540e\u4e00\u4f4d t \u8868\u660e\u8be5\u76ee\u5f55\u88ab\u8bbe\u7f6e\u4e86 SBIT \u6743\u9650\u3002SBIT \u5bf9\u76ee\u5f55\u7684\u4f5c\u7528\u662f\uff1a\u5f53\u7528\u6237\u5728\u8be5\u76ee\u5f55\u4e0b\u521b\u5efa\u65b0\u6587\u4ef6\u6216\u76ee\u5f55\u65f6\uff0c\u4ec5\u6709\u81ea\u5df1\u548c root \u624d\u6709\u6743\u529b\u5220\u9664\uff0c\u4e3b\u8981\u4f5c\u7528\u4e8e\u4e00\u4e2a\u5171\u4eab\u7684\u6587\u4ef6\u5939\u3002<\/p>\n<h2>\u4e09 \u6587\u4ef6\u6743\u9650\u7ba1\u7406\u4e4bumask<\/h2>\n<p>\u65b0\u5efa\u6587\u4ef6\u3001\u76ee\u5f55\u7684\u9ed8\u8ba4\u6743\u9650\u662f\u7531umask\u51b3\u5b9a\u7684<\/p>\n<p>1\u3001uid&gt;199\u5e76\u4e14\u5c5e\u4e3b\u4e0e\u6570\u7ec4\u76f8\u7b49\u7684\u7528\u6237\u4e0b\uff0cumask: 0002<\/p>\n<ul>\n<li>\u6587\u4ef6 664        <\/li>\n<li>\u76ee\u5f55 775<\/li>\n<\/ul>\n<p>2\u3001\u96641\u4e4b\u5916\u7684\u5176\u4ed6\u7528\u6237\u4e0b\uff0c\u6bd4\u5982root\u7528\u6237\uff0cumask: 0022<\/p>\n<ul>\n<li>\u6587\u4ef6 644        <\/li>\n<li>\u76ee\u5f55 755<\/li>\n<\/ul>\n<p>linux\u4e2d\u6587\u4ef6\u9ed8\u8ba4\u6743\u9650\u4e3a666\u3001\u76ee\u5f55\u6743\u9650\u9ed8\u8ba4\u4e3a777\uff0c\u5728umask\u7684\u5f71\u54cd\u4e0b<\/p>\n<p><strong>\u6587\u4ef6\u6743\u9650\u8ba1\u7b97\u65b9\u6cd5<\/strong>\uff1a\u5076\u6570\u4f4d\u76f4\u63a5\u76f8\u51cf\uff0c\u5947\u6570\u4f4d\u76f8\u51cf\u540e\u52a01<\/p>\n<table>\n<thead>\n<tr>\n<th><strong>\u6587\u4ef6\u7684\u8d77\u59cb\u6743\u9650\u503c<\/strong><\/th>\n<th><strong>umask\u503c<\/strong><\/th>\n<th><strong>\u64cd\u4f5c<\/strong><\/th>\n<th><strong>\u8ba1\u7b97\u540e\u6587\u4ef6\u6743\u9650<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>666<\/strong><\/td>\n<td>022  (\u6bcf\u4f4d\u5982\u679c\u90fd\u662f\u5076\u6570)<\/td>\n<td>\u76f4\u63a5\u76f8\u51cf\u5373\u53ef<\/td>\n<td>644<\/td>\n<\/tr>\n<tr>\n<td><strong>666<\/strong><\/td>\n<td>033  (\u6bcf\u4f4d\u5982\u679c\u6709\u5947\u6570\u6216\u5076\u6570)<\/td>\n<td>\u76f8\u51cf\uff08\u5947\u6570\u4f4d\u76f8\u51cf\u540e\u5728\u5176\u539f\u5947\u6570\u4f4d\u52a01\uff09<\/td>\n<td>644<\/td>\n<\/tr>\n<tr>\n<td><strong>666<\/strong><\/td>\n<td>325(\u6bcf\u4f4d\u5982\u679c\u6709\u5947\u6570\u6216\u5076\u6570)<\/td>\n<td>\u76f8\u51cf\uff08\u5947\u6570\u4f4d\u76f8\u51cf\u540e\u5728\u5176\u539f\u5947\u6570\u4f4d\u52a01\uff09<\/td>\n<td>442<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u76ee\u5f55\u6743\u9650\u8ba1\u7b97\u65b9\u6cd5<\/strong>\uff1a\u76f4\u63a5\u76f8\u51cf\u5373\u53ef<\/p>\n<table>\n<thead>\n<tr>\n<th><strong>\u6587\u4ef6\u7684\u8d77\u59cb\u6743\u9650\u503c<\/strong><\/th>\n<th><strong>umask\u503c<\/strong><\/th>\n<th><strong>\u64cd\u4f5c<\/strong><\/th>\n<th><strong>\u8ba1\u7b97\u540e\u6587\u4ef6\u6743\u9650<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>777<\/strong><\/td>\n<td>022<\/td>\n<td>\u76f8\u51cf<\/td>\n<td>755<\/td>\n<\/tr>\n<tr>\n<td><strong>777<\/strong><\/td>\n<td>033<\/td>\n<td>\u76f8\u51cf<\/td>\n<td>744<\/td>\n<\/tr>\n<tr>\n<td><strong>777<\/strong><\/td>\n<td>325<\/td>\n<td>\u76f8\u51cf<\/td>\n<td>452<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u603b\u7ed3\uff1aumask\u8bbe\u7f6e\u7684\u8d8a\u5c0f\uff0c\u6743\u9650\u8d8a\u5927\uff0c\u614e\u7528<\/p>\n<p>\u4e34\u65f6\u8bbe\u7f6eumask<\/p>\n<pre><code class=\"language-python\">[root@localhost ~]# umask 000       \/\/\u8bbe\u7f6eumask\u6743\u9650<\/code><\/pre>\n<p>\u6c38\u4e45\u8bbe\u7f6eumask<\/p>\n<pre><code class=\"language-python\">[root@localhost tmp]# vim \/etc\/profile  # \u6216\u8005\/etc\/bashrc\u5185\u5bb9\u4e00\u6837\n......\nif [ $UID -gt 199 ] &amp;&amp; [ &quot;`id -gn`&quot; = &quot;`id -un`&quot; ]; then\n   umask 002    \/\/\u8868\u793auid\u5927\u4e8e\u7b49\u4e8e199\u7684\u9ed8\u8ba4umask\u503c\uff0c\u8868\u793a\u666e\u901a\u7528\u6237\nelse\n   umask 022    \/\/\u8868\u793auid\u5c0f\u4e8e199\u7684\u9ed8\u8ba4umask\u503c\uff0c\u8868\u793aroot\nfi<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6743\u9650\u7ba1\u7406-\u6587\u4ef6\u6743\u9650 \u628a\u4e00\u4e2a\u7528\u6237\u52a0\u5165\u4e86\u4e00\u4e2a\u7ec4\uff0c\u8be5\u7528\u6237\u5c31\u62e5\u6709\u4e86\u8be5\u7ec4\u7684\u6743\u9650\uff0c\u5f53\u4e00\u4e2a\u7528\u6237\u8981\u64cd\u4f5c\u67d0\u4e2a\u6587\u4ef6\u65f6\uff0c\u7cfb\u7edf\u4f1a\u4f9d\u6b21\u68c0 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":32,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[26],"tags":[21,19,35,22,20],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/200"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=200"}],"version-history":[{"count":1,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/200\/revisions"}],"predecessor-version":[{"id":8453,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/200\/revisions\/8453"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/32"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}