{"id":310,"date":"2017-07-28T14:13:31","date_gmt":"2017-07-28T06:13:31","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=310"},"modified":"2017-07-28T14:13:31","modified_gmt":"2017-07-28T06:13:31","slug":"%e7%ae%80%e4%bb%8bselinux%e7%9a%84%e5%9c%a8centos-7-%e7%ac%ac3%e9%83%a8%e5%88%86%ef%bc%9a%e7%94%a8%e6%88%b7","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=310","title":{"rendered":"\u7b80\u4ecbSELinux\u7684\u5728CentOS 7 \u2013 \u7b2c3\u90e8\u5206\uff1a\u7528\u6237"},"content":{"rendered":"<h3 id=\"introduction\">\u4ecb\u7ecd<\/h3>\n<p>\u5728\u6211\u4eec\u7684SELinux\u6559\u7a0b\u7684\u6700\u540e\u4e00\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u8ba8\u8bbaSELinux\u7528\u6237\u4ee5\u53ca\u5982\u4f55\u5fae\u8c03\u4ed6\u4eec\u7684\u8bbf\u95ee\u3002\u00a0\u6211\u4eec\u8fd8\u5c06\u4e86\u89e3SELinux\u9519\u8bef\u65e5\u5fd7\u4ee5\u53ca\u5982\u4f55\u4e86\u89e3\u9519\u8bef\u6d88\u606f\u3002<\/p>\n<blockquote><p><strong>\u6ce8\u610f<\/strong><br \/>\n\u672c\u6559\u7a0b\u4e2d\u663e\u793a\u7684\u547d\u4ee4\uff0c\u5305\u548c\u6587\u4ef6\u5728CENTOS 7\u4e0a\u8fdb\u884c\u4e86\u6d4b\u8bd5\u3002\u5176\u4ed6\u53d1\u884c\u7248\u7684\u6982\u5ff5\u4fdd\u6301\u4e0d\u53d8\u3002<\/p><\/blockquote>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u9664\u975e\u53e6\u6709\u8bf4\u660e\uff0c\u5426\u5219\u6211\u4eec\u5c06\u4ee5root\u7528\u6237\u8eab\u4efd\u8fd0\u884c\u547d\u4ee4\u3002\u00a0\u5982\u679c\u60a8\u6ca1\u6709\u8bbf\u95ee\u5230root\u5e10\u6237\uff0c\u5e76\u4f7f\u7528\u4f7f\u7528sudo\u6743\u9650\u7684\u5176\u4ed6\u5e10\u6237\uff0c\u60a8\u9700\u8981\u4e0e\u5148\u4e8e\u547d\u4ee4<code class=\" prettyprinted\"><span class=\"pln\">sudo<\/span><\/code>\u5173\u952e\u5b57\u3002<\/p>\n<h2 id=\"selinux-users\">SELinux\u7528\u6237<\/h2>\n<p>SELinux\u7528\u6237\u662f\u4e0e\u666e\u901aLinux\u7528\u6237\u5e10\u6237\u4e0d\u540c\u7684\u5b9e\u4f53\uff0c\u5305\u62ecroot\u5e10\u6237\u3002\u00a0SELinux\u7528\u6237\u4e0d\u662f\u4f7f\u7528\u7279\u6b8a\u547d\u4ee4\u521b\u5efa\u7684\uff0c\u4e5f\u4e0d\u5177\u6709\u5bf9\u670d\u52a1\u5668\u7684\u81ea\u5df1\u7684\u767b\u5f55\u8bbf\u95ee\u6743\u9650\u3002\u00a0\u76f8\u53cd\uff0cSELinux\u7528\u6237\u5728\u5f15\u5bfc\u65f6\u52a0\u8f7d\u5230\u5185\u5b58\u7684\u7b56\u7565\u4e2d\u5b9a\u4e49\uff0c\u5e76\u4e14\u53ea\u6709\u5c11\u6570\u7528\u6237\u3002\u00a0\u7528\u6237\u540d\u79f0\u4ee5<code class=\" prettyprinted\"><span class=\"pln\">_u<\/span><\/code>\u00a0\uff0c\u5c31\u50cf\u7c7b\u578b\u6216\u57df\u540d\u7ed3\u675f\u4e0e<code class=\" prettyprinted\"><span class=\"pln\">_t<\/span><\/code>\u548c\u89d2\u8272\u7ed3\u675f<code class=\" prettyprinted\"><span class=\"pln\">_r<\/span><\/code>\u00a0\u3002\u00a0\u4e0d\u540c\u7684SELinux\u7528\u6237\u5728\u7cfb\u7edf\u4e2d\u5177\u6709\u4e0d\u540c\u7684\u6743\u9650\uff0c\u8fd9\u5c31\u662f\u5b83\u4eec\u7684\u7528\u9014\u3002<\/p>\n<p>\u5728\u6587\u4ef6\u5b89\u5168\u4e0a\u4e0b\u6587\u7684\u7b2c\u4e00\u90e8\u5206\u4e2d\u5217\u51fa\u7684SELinux\u7528\u6237\u662f\u62e5\u6709\u8be5\u6587\u4ef6\u7684\u7528\u6237\u3002\u00a0\u8fd9\u5c31\u50cf\u4f60\u4f1a\u770b\u5230\u6587\u4ef6\u7684\u6240\u6709\u8005\u4ece\u4e00\u4e2a\u666e\u901a<code class=\" prettyprinted\"><span class=\"pln\">ls\u00a0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">l<\/span><\/code>\u547d\u4ee4\u7684\u8f93\u51fa\u3002\u00a0\u8fdb\u7a0b\u4e0a\u4e0b\u6587\u4e2d\u7684\u7528\u6237\u6807\u7b7e\u663e\u793a\u8fdb\u7a0b\u6b63\u5728\u8fd0\u884c\u7684SELinux\u7528\u6237\u6743\u9650\u3002<\/p>\n<p>\u5f53\u5f3a\u5236\u6267\u884cSELinux\u65f6\uff0c\u6bcf\u4e2a\u5e38\u89c4Linux\u7528\u6237\u5e10\u6237\u90fd\u6620\u5c04\u5230SELinux\u7528\u6237\u5e10\u6237\u3002\u00a0\u53ef\u4ee5\u6709\u591a\u4e2a\u7528\u6237\u5e10\u6237\u6620\u5c04\u5230\u540c\u4e00\u4e2aSELinux\u7528\u6237\u3002\u00a0\u6b64\u6620\u5c04\u4f7f\u5e38\u89c4\u5e10\u6237\u80fd\u591f\u7ee7\u627f\u5176SELinux\u5bf9\u5e94\u65b9\u7684\u6743\u9650\u3002<\/p>\n<p>\u8981\u67e5\u770b\u8be5\u6620\u5c04\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u8fd0\u884c<code class=\" prettyprinted\"><span class=\"pln\">semanage login\u00a0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">l<\/span><\/code>\u547d\u4ee4\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">semanage login <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l<\/span><\/code><\/pre>\n<p>\u5728CentOS 7\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">Login<\/span> <span class=\"typ\">Name<\/span>           <span class=\"typ\">SELinux<\/span> <span class=\"typ\">User<\/span><span class=\"pln\">         MLS<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">MCS <\/span><span class=\"typ\">Range<\/span>        <span class=\"typ\">Service<\/span><span class=\"pln\">\n\n__default__          unconfined_u         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023       <\/span><span class=\"pun\">*<\/span><span class=\"pln\">\nroot                 unconfined_u         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023       <\/span><span class=\"pun\">*<\/span><span class=\"pln\">\nsystem_u             system_u             s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023       <\/span><span class=\"pun\">*<\/span><\/code><\/pre>\n<p>\u6b64\u8868\u4e2d\u7684\u7b2c\u4e00\u5217\u201c\u767b\u5f55\u540d\u201d\u8868\u793a\u672c\u5730Linux\u7528\u6237\u5e10\u6237\u3002\u00a0\u4f46\u662f\u8fd9\u91cc\u53ea\u5217\u51fa\u4e86\u4e09\u4e2a\uff0c\u4f60\u53ef\u80fd\u4f1a\u95ee\uff0c\u6211\u4eec\u5728\u672c\u6559\u7a0b\u7684\u7b2c\u4e8c\u90e8\u5206\u4e2d\u6ca1\u6709\u521b\u5efa\u51e0\u4e2a\u5e10\u6237\u5417\uff1f\u00a0\u662f\u7684\uff0c\u5e76\u4e14\u5b83\u4eec\u88ab\u793a\u51fa\u4e3a<strong>\u9ed8\u8ba4<\/strong>\u7684\u6761\u76ee\u8868\u793a\u3002\u00a0\u4efb\u4f55\u666e\u901a\u7684Linux\u7528\u6237\u5e10\u6237\u88ab\u9996\u5148\u6620\u5c04\u5230<strong>\u9ed8\u8ba4<\/strong>\u767b\u5f55\u3002\u00a0\u7136\u540e\u5c06\u5176\u6620\u5c04\u5230\u540d\u4e3aunconfined_u\u7684SELinux\u7528\u6237\u3002\u00a0\u5728\u6211\u4eec\u7684\u4f8b\u5b50\u4e2d\uff0c\u8fd9\u662f\u7b2c\u4e00\u884c\u7684\u7b2c\u4e8c\u5217\u3002\u00a0\u7b2c\u4e09\u5217\u663e\u793a\u7528\u6237\u7684\u591a\u7ea7\u5b89\u5168\/\u591a\u7c7b\u522b\u5b89\u5168\uff08MLS \/ MCS\uff09\u7c7b\u3002\u00a0\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u5ffd\u7565\u8be5\u90e8\u5206\uff0c\u4ee5\u53ca\u4e4b\u540e\u7684\u5217\uff08\u670d\u52a1\uff09\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u6709<strong>\u6839<\/strong>\u7528\u6237\u3002\u00a0\u8bf7\u6ce8\u610f\uff0c\u8fd9\u4e0d\u662f\u6620\u5c04\u5230\u201c\u00a0<strong>\u9ed8\u8ba4<\/strong>\u00a0\u201d\u7684\u767b\u5f55\uff0c\u800c\u662f\u88ab\u8d4b\u4e88\u4e86\u5176\u81ea\u8eab\u7684\u6761\u76ee\u3002\u00a0\u540c\u6837\uff0croot\u4e5f\u6620\u5c04\u5230unconfined_u SELinux\u7528\u6237\u3002<\/p>\n<p>system_u\u662f\u4e0d\u540c\u7c7b\u7684\u7528\u6237\uff0c\u7528\u4e8e\u8fd0\u884c\u8fdb\u7a0b\u6216\u5b88\u62a4\u7a0b\u5e8f\u3002<\/p>\n<p>\u8981\u4e86\u89e3SELinux\u7684\u7528\u6237\u5728\u7cfb\u7edf\u4e2d\u53ef\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd0\u884c<code class=\" prettyprinted\"><span class=\"pln\">semanage user<\/span><\/code>\u547d\u4ee4\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">semanage user <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l<\/span><\/code><\/pre>\n<p>\u6211\u4eec\u7684CentOS 7\u7cfb\u7edf\u7684\u8f93\u51fa\u5e94\u8be5\u662f\u8fd9\u6837\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\">                 <span class=\"typ\">Labeling<\/span><span class=\"pln\">   MLS<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">       MLS<\/span><span class=\"pun\">\/<\/span>\n<span class=\"typ\">SELinux<\/span> <span class=\"typ\">User<\/span>    <span class=\"typ\">Prefix<\/span><span class=\"pln\">     MCS <\/span><span class=\"typ\">Level<\/span><span class=\"pln\">  MCS <\/span><span class=\"typ\">Range<\/span>                      <span class=\"typ\">SELinux<\/span> <span class=\"typ\">Roles<\/span><span class=\"pln\">\n\nguest_u         user       s0         s0                             guest_r\nroot            user       s0         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023                 staff_r sysadm_r system_r unconfined_r\nstaff_u         user       s0         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023                 staff_r sysadm_r system_r unconfined_r\nsysadm_u        user       s0         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023                 sysadm_r\nsystem_u        user       s0         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023                 system_r unconfined_r\nunconfined_u    user       s0         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023                 system_r unconfined_r\nuser_u          user       s0         s0                             user_r\nxguest_u        user       s0         s0                             xguest_r<\/span><\/code><\/pre>\n<p>\u8fd9\u4e2a\u66f4\u5927\u7684\u8868\u662f\u4ec0\u4e48\u610f\u601d\uff1f\u00a0\u9996\u5148\uff0c\u5b83\u663e\u793a\u7b56\u7565\u5b9a\u4e49\u7684\u4e0d\u540cSELinux\u7528\u6237\u3002\u00a0\u6211\u4eec\u66fe\u7ecf\u770b\u8fc7\u7528\u6237\u559c\u6b22unconfined_u\u548csystem_u\uff0c\u4f46\u6211\u4eec\u73b0\u5728\u770b\u5230\u7684\u5176\u4ed6\u7c7b\u578b\u7684\u7528\u6237\uff0c\u5982guest_u\uff0cstaff_u\uff0csysadm_u\uff0cuser_u\u7b49\u3002\u00a0\u8fd9\u4e9b\u540d\u79f0\u5728\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u8868\u793a\u4e0e\u4ed6\u4eec\u76f8\u5173\u7684\u6743\u5229\u3002\u00a0\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u5047\u8bbesysadm_u\u7528\u6237\u6bd4guest_u\u62e5\u6709\u66f4\u591a\u7684\u8bbf\u95ee\u6743\u9650\u3002<\/p>\n<p>\u4e3a\u4e86\u9a8c\u8bc1\u6211\u4eec\u7684\u5ba2\u4eba\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u770b\u7b2c\u4e94\u5217\uff0cSELinux\u89d2\u8272\u3002\u00a0\u5982\u679c\u4f60\u8fd8\u8bb0\u5f97\u672c\u6559\u7a0b\u7684\u7b2c\u4e00\u90e8\u5206\uff0cSELinux\u89d2\u8272\u5c31\u50cf\u662f\u7528\u6237\u548c\u8fdb\u7a0b\u4e4b\u95f4\u7684\u7f51\u5173\u3002\u00a0\u6211\u4eec\u8fd8\u6bd4\u8f83\u4e86\u5b83\u4eec\u7684\u8fc7\u6ee4\u5668\uff1a\u7528\u6237\u53ef\u4ee5<em>\u8f93\u5165<\/em>\u4e00\u4e2a\u89d2\u8272\uff0c\u53ea\u8981\u89d2\u8272\u6388\u4e88\u5b83\u3002\u00a0\u5982\u679c\u89d2\u8272\u88ab\u6388\u6743\u8bbf\u95ee\u8fdb\u7a0b\u57df\uff0c\u4e0e\u8be5\u89d2\u8272\u5173\u8054\u7684\u7528\u6237\u5c06\u80fd\u591f\u8fdb\u5165\u8be5\u8fdb\u7a0b\u57df\u3002<\/p>\n<p>\u73b0\u5728\u4ece\u8be5\u8868\u4e2d\u53ef\u4ee5\u770b\u5230<code class=\" prettyprinted\"><span class=\"pln\">unconfined_u<\/span><\/code>\u7528\u6237\u88ab\u6620\u5c04\u5230<code class=\" prettyprinted\"><span class=\"pln\">system_r<\/span><\/code>\u548c<code class=\" prettyprinted\"><span class=\"pln\">unconfined_r<\/span><\/code>\u89d2\u8272\u3002\u00a0\u867d\u7136\u5728\u8fd9\u91cc\u6ca1\u6709\u660e\u663e\uff0cSELinux\u7b56\u7565\u5b9e\u9645\u4e0a\u5141\u8bb8\u8fd9\u4e9b\u89d2\u8272\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d<code class=\" prettyprinted\"><span class=\"typ\">unconfined_t<\/span><\/code>\u57df\u3002\u00a0\u540c\u6837\uff0c\u7528\u6237<code class=\" prettyprinted\"><span class=\"pln\">sysadm_u<\/span><\/code>\u88ab\u6388\u6743\u4e3a<em>SYSADM\u0159\u4f5c\u7528\uff0c\u4f46\u5ba2\u4eba<\/em>\u00a0u\u88ab\u6620\u5c04\u5230guest_r\u4f5c\u7528\u3002\u00a0\u8fd9\u4e9b\u89d2\u8272\u4e2d\u7684\u6bcf\u4e00\u4e2a\u90fd\u5c06\u62e5\u6709\u4e3a\u5176\u6388\u6743\u7684\u4e0d\u540c\u57df\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u5982\u679c\u6211\u4eec\u9000\u540e\u4e00\u6b65\uff0c\u6211\u4eec\u4e5f\u4ece\u7b2c\u4e00\u4ee3\u7801\u7247\u65ad\u770b\u5230\uff0c\u00a0<strong>\u9ed8\u8ba4<\/strong>\u7684\u767b\u5f55\u6620\u5c04\u5230\u6f5c\u6c34<em>-u\u7528\u6237\uff0c\u5c31\u50cfroot\u7528\u6237\u6620\u5c04\u5230\u7528\u6237unconfined_u\u3002<\/em>\u00a0<em>\u7531\u4e8e**<\/em>\u00a0<em>\u9ed8\u8ba4<\/em>\u00a0_ **\u767b\u5f55\u8868\u793a\u4efb\u4f55\u666e\u901a\u7684Linux\u7528\u6237\u5e10\u6237\uff0c\u8fd9\u4e9b\u5e10\u6237\u5c06\u88ab\u6388\u6743system_r\u548cunconfined_r\u89d2\u8272\u4e3a\u597d\u3002<\/p>\n<p>\u6240\u4ee5\u8fd9\u771f\u7684\u610f\u5473\u7740\u4efb\u4f55\u6620\u5c04\u5230unconfined_u\u7528\u6237\u7684Linux\u7528\u6237\u90fd\u6709\u6743\u9650\u8fd0\u884c\u5728unconfined_t\u57df\u4e2d\u8fd0\u884c\u7684\u4efb\u4f55\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<p>\u4e3a\u4e86\u8bc1\u660e\u8fd9\u4e00\u70b9\uff0c\u8ba9\u6211\u4eec\u8fd0\u884c<code class=\" prettyprinted\"><span class=\"pln\">id\u00a0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">Z<\/span><\/code>\u547d\u4ee4\u4f5c\u4e3a\u6839\u7528\u6237\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">id <\/span><span class=\"pun\">-<\/span><span class=\"pln\">Z<\/span><\/code><\/pre>\n<p>\u8fd9\u8868\u660e<strong>root<\/strong>\u7684SELinux\u7684\u5b89\u5168\u4e0a\u4e0b\u6587\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">unconfined_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">unconfined_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">unconfined_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023<\/span><\/code><\/pre>\n<p>\u56e0\u6b64\uff0croot\u5e10\u6237\u6620\u5c04\u5230unconfined_u SELinux\u7528\u6237\uff0cunconfined_u\u5bf9unconfined_r\u89d2\u8272\u6388\u6743\uff0c\u800cunconfined_r\u89d2\u8272\u53c8\u88ab\u6388\u6743\u8fd0\u884cunconfined_t\u57df\u4e2d\u7684\u8fdb\u7a0b\u3002<\/p>\n<p>\u6211\u4eec\u5efa\u8bae\u60a8\u73b0\u5728\u82b1\u65f6\u95f4\u4e0e\u4ece\u72ec\u7acb\u7ec8\u7aef\u7a97\u53e3\u521b\u5efa\u7684\u56db\u4e2a\u7528\u6237\u5f00\u59cb\u56db\u4e2a\u65b0\u7684SSH\u4f1a\u8bdd\u3002\u00a0\u8fd9\u5c06\u6709\u52a9\u4e8e\u6211\u4eec\u5728\u9700\u8981\u65f6\u5728\u4e0d\u540c\u7684\u5e10\u6237\u4e4b\u95f4\u5207\u6362\u3002<\/p>\n<ul>\n<li>\u666e\u901a\u7528\u6237<\/li>\n<li>\u5207\u6362\u7528\u6237<\/li>\n<li>\u8bbf\u5ba2<\/li>\n<li>restricteduser<\/li>\n<\/ul>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5207\u6362\u5230\u4ee5\u5e38\u89c4\u7528\u6237\u8eab\u4efd\u767b\u5f55\u7684\u7ec8\u7aef\u4f1a\u8bdd\u3002\u00a0\u5982\u679c\u4f60\u8fd8\u8bb0\u5f97\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e9b\u7528\u6237\u8d26\u6237\u4e2d\u7684<a href=\"http:\/\/www.howtoing.com\/an-introduction-to-selinux-on-centos-7-part-2-files-and-processes\/\">\u7b2c\u4e8c\u4e2a\u6559\u7a0b<\/a>\u00a0\uff0c\u5e76regularuser\u662f\u5176\u4e2d\u4e4b\u4e00\u3002\u00a0\u5982\u679c\u60a8\u5c1a\u672a\u8fd9\u6837\u505a\uff0c\u8bf7\u6253\u5f00\u4e00\u4e2a\u5355\u72ec\u7684\u7ec8\u7aef\u7a97\u53e3\uff0c\u4ee5\u5e38\u89c4\u7528\u6237\u8eab\u4efd\u8fde\u63a5\u5230CentOS 7\u7cfb\u7edf\u3002\u00a0\u5982\u679c\u6211\u4eec\u6267\u884c\u76f8\u540c\u7684<code class=\" prettyprinted\"><span class=\"pln\">id\u00a0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">Z<\/span><\/code>\u4ece\u90a3\u91cc\u6307\u6325\uff0c\u8f93\u51fa\u4f1a\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">regularuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ id <\/span><span class=\"pun\">-<\/span><span class=\"pln\">Z<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">unconfined_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">unconfined_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">unconfined_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023<\/span><\/code><\/pre>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cregulauser\u5e10\u6237\u6620\u5c04\u5230unconfined_u SELinux\u7528\u6237\u5e10\u6237\uff0c\u5b83\u53ef\u4ee5\u627f\u62c5unconfined_r\u89d2\u8272\u3002\u89d2\u8272\u53ef\u4ee5\u5728\u65e0\u7ea6\u675f\u57df\u4e2d\u8fd0\u884c\u8fdb\u7a0b\u3002\u00a0\u8fd9\u4e0eroot\u5e10\u6237\u4e5f\u6620\u5c04\u5230\u7684SELinux\u7528\u6237\/\u89d2\u8272\/\u57df\u76f8\u540c\u3002\u00a0\u8fd9\u662f\u56e0\u4e3aSELinux\u76ee\u6807\u7b56\u7565\u5141\u8bb8\u767b\u5f55\u7528\u6237\u5728\u65e0\u9650\u5236\u57df\u4e2d\u8fd0\u884c\u3002<\/p>\n<p>\u6211\u4eec\u4ee5\u524d\u770b\u8fc7\u4e00\u4e9bSELinux\u7528\u6237\u7684\u5217\u8868\uff1a<\/p>\n<ul>\n<li><strong>guest_u\uff1a<\/strong>\u8be5\u7528\u6237\u8fd8\u6ca1\u6709\u8bbf\u95ee\u7684X-Window\u7cfb\u7edf\uff08GUI\uff09\u6216\u8054\u7f51\u548c\u4e0d\u80fd\u6267\u884c\u30b9\/Sudo\u547d\u4ee4\u3002<\/li>\n<li><strong>xguest_u\uff1a<\/strong>\u6b64\u7528\u6237\u53ef\u4ee5\u8bbf\u95eeGUI\u5de5\u5177\u548c\u7f51\u7edc\u901a\u8fc7Firefox\u6d4f\u89c8\u5668\u662f\u53ef\u7528\u7684\u3002<\/li>\n<li><strong>user_u\uff1a<\/strong>\u6b64\u7528\u6237\u62e5\u6709\u6bd4\u6765\u5bbe\u5e10\u6237\uff08GUI\u548c\u7f51\u7edc\uff09\u66f4\u591a\u7684\u673a\u4f1a\uff0c\u4f46\u4e0d\u80fd\u8fd0\u884csu\u6216sudo\u7684\u5207\u6362\u7528\u6237\u3002<\/li>\n<li><strong>staff_u\uff1a<\/strong>\u540c\u6837\u7684\u6743\u5229\uff0cuser_u\uff0c\u5b83\u9664\u4e86\u53ef\u4ee5\u6267\u884csudo\u547d\u4ee4\u6709root\u6743\u9650\u3002<\/li>\n<li><strong>system_u\uff1a<\/strong>\u8be5\u7528\u6237\u662f\u6307\u5bf9\u4e8e\u8fd0\u884c\u7cfb\u7edf\u7684\u670d\u52a1\uff0c\u800c\u4e0d\u662f\u88ab\u6620\u5c04\u5230\u4e00\u822c\u7528\u6237\u5e10\u6237\u3002<\/li>\n<\/ul>\n<h2 id=\"selinux-in-action-1-restricting-switched-user-access\">SELinux\u5728\u64cd\u4f5c1\uff1a\u9650\u5236\u4ea4\u6362\u5f0f\u7528\u6237\u8bbf\u95ee<\/h2>\n<p>\u8981\u4e86\u89e3SELinux\u5982\u4f55\u4e3a\u7528\u6237\u5e10\u6237\u5f3a\u5236\u6267\u884c\u5b89\u5168\u6027\uff0c\u8ba9\u6211\u4eec\u8003\u8651\u5e38\u89c4\u7528\u6237\u5e10\u6237\u3002\u00a0\u4f5c\u4e3a\u7cfb\u7edf\u7ba1\u7406\u5458\uff0c\u4f60\u73b0\u5728\u77e5\u9053\u7528\u6237\u5177\u6709\u76f8\u540c<em>\u7684SELinux<\/em>\u4e0d\u53d7\u9650\u5236<em>\u7684\u7279\u6743<\/em>\u4f5c\u4e3aroot\u5e10\u6237\uff0c\u4f60\u60f3\u6539\u53d8\u8fd9\u79cd\u72b6\u51b5\u3002\u00a0\u5177\u4f53\u6765\u8bf4\uff0c\u60a8\u4e0d\u5e0c\u671b\u7528\u6237\u80fd\u591f\u5207\u6362\u5230\u5176\u4ed6\u5e10\u6237\uff0c\u5305\u62ecroot\u5e10\u6237\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u5148\u68c0\u67e5\u7528\u6237\u5207\u6362\u5230\u5176\u4ed6\u5e10\u6237\u7684\u80fd\u529b\u3002\u00a0\u5728\u4ee5\u4e0b\u4ee3\u7801\u6bb5\u4e2d\uff0c\u5e38\u89c4\u7528\u6237\u5207\u6362\u5230switcheduser\u5e10\u6237\u3002\u00a0\u6211\u4eec\u5047\u8bbe\u4ed6\u77e5\u9053switcheduser\u7684\u5bc6\u7801\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">regularuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ su <\/span><span class=\"pun\">-<\/span><span class=\"pln\"> switcheduser\n<\/span><span class=\"typ\">Password<\/span><span class=\"pun\">:<\/span>\n<span class=\"pun\">[<\/span><span class=\"pln\">switcheduser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$<\/span><\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u518d\u56de\u5230\u767b\u5f55\u4e3a<strong>root<\/strong>\u7528\u6237\uff0c\u5e76\u6539\u53d8regularuser\u7684SELinux\u7684\u7528\u6237\u6620\u5c04\u7ec8\u7aef\u7a97\u53e3\u3002\u00a0\u6211\u4eec\u5c06\u628aregularuser\u6620\u5c04\u5230user_u\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">semanage login <\/span><span class=\"pun\">-<\/span><span class=\"pln\">a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">s user_u regularuser<\/span><\/code><\/pre>\n<p>\u90a3\u4e48\u6211\u4eec\u5728\u8fd9\u91cc\u505a\u4ec0\u4e48\uff1f\u00a0\u6211\u4eec\u5c06\uff08-a\uff09\u5e38\u89c4\u7528\u6237\u5e10\u6237\u6dfb\u52a0\u5230SELinux\uff08-s\uff09\u7528\u6237\u5e10\u6237user_u\u3002\u00a0\u8be5\u66f4\u6539\u5c06\u5728\u5e38\u89c4\u7528\u6237\u6ce8\u9500\u5e76\u91cd\u65b0\u767b\u5f55\u540e\u624d\u751f\u6548\u3002<\/p>\n<p>\u56de\u5230\u5e38\u89c4\u7528\u6237\u7684\u7ec8\u7aef\u7a97\u53e3\uff0c\u6211\u4eec\u9996\u5148\u4ece\u5207\u6362\u7684\u7528\u6237\u5207\u6362\u56de\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">switcheduser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ logout<\/span><\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\uff0cregularuser\u4e5f\u6ce8\u9500\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">regularuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ logout<\/span><\/code><\/pre>\n<p>\u7136\u540e\u6211\u4eec\u6253\u5f00\u4e00\u4e2a\u65b0\u7684\u7ec8\u7aef\u7a97\u53e3\uff0c\u4ee5\u6b63\u5e38\u7528\u6237\u8eab\u4efd\u8fde\u63a5\u3002\u00a0\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c1d\u8bd5\u518d\u6b21\u66f4\u6539\u4e3aswitcheduser\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">regularuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ su <\/span><span class=\"pun\">-<\/span><span class=\"pln\"> switcheduser<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">Password<\/span><span class=\"pun\">:<\/span><\/code><\/pre>\n<p>\u8fd9\u662f\u6211\u4eec\u73b0\u5728\u770b\u5230\u7684\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">su<\/span><span class=\"pun\">:<\/span> <span class=\"typ\">Authentication<\/span><span class=\"pln\"> failure<\/span><\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u73b0\u5728\u8fd0\u884c<code class=\" prettyprinted\"><span class=\"pln\">id\u00a0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">Z<\/span><\/code>\u518d\u6b21\u547d\u4ee4\u53ef\u4ee5\u67e5\u770bregularuser SELinux\u4e0a\u4e0b\u6587\uff0c\u6211\u4eec\u5c06\u770b\u5230\u8f93\u51fa\u4ece\u6211\u4eec\u4e4b\u524d\u770b\u5230\u7684\u5b8c\u5168\u4e0d\u540c\uff1aregularuser\u73b0\u5728\u6620\u5c04\u5230user_u\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">regularuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ id <\/span><span class=\"pun\">-<\/span><span class=\"pln\">Z<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">user_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">user_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">user_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0<\/span><\/code><\/pre>\n<p>\u90a3\u4e48\u4f60\u5c06\u5728\u54ea\u91cc\u4f7f\u7528\u8fd9\u4e9b\u9650\u5236\uff1f\u00a0\u60a8\u53ef\u4ee5\u8003\u8651\u5728\u60a8\u7684IT\u7ec4\u7ec7\u5185\u90e8\u7684\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u56e2\u961f\u3002\u00a0\u60a8\u53ef\u4ee5\u5728\u8be5\u56e2\u961f\u4e2d\u6709\u4e00\u4e9b\u5f00\u53d1\u4eba\u5458\u548c\u6d4b\u8bd5\u4eba\u5458\u4e3a\u60a8\u7684\u516c\u53f8\u7f16\u5199\u548c\u6d4b\u8bd5\u6700\u65b0\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u00a0\u4f5c\u4e3a\u7cfb\u7edf\u7ba1\u7406\u5458\uff0c\u60a8\u77e5\u9053\u5f00\u53d1\u4eba\u5458\u6b63\u5728\u4ece\u5176\u5e10\u6237\u5207\u6362\u5230\u67d0\u4e9b\u9ad8\u7279\u6743\u5e10\u6237\uff0c\u4ee5\u4fbf\u5bf9\u60a8\u7684\u670d\u52a1\u5668\u8fdb\u884c\u7279\u522b\u66f4\u6539\u3002\u00a0\u60a8\u53ef\u4ee5\u901a\u8fc7\u9650\u5236\u5176\u5207\u6362\u5e10\u6237\u7684\u80fd\u529b\u6765\u963b\u6b62\u8fd9\u79cd\u60c5\u51b5\u7684\u53d1\u751f\u3002\u00a0\uff08\u6ce8\u610f\uff0c\u867d\u7136\uff0c\u5b83\u4ecd\u7136\u4e0d\u4f1a\u963b\u6b62\u4ed6\u4eec\u76f4\u63a5\u767b\u5f55\u4e3a\u9ad8\u6743\u9650\u7684\u7528\u6237\uff09\u3002<\/p>\n<h2 id=\"selinux-in-action-2-restricting-permissions-to-run-scripts\">SELinux\u5728\u64cd\u4f5c2\u4e2d\uff1a\u9650\u5236\u8fd0\u884c\u811a\u672c\u7684\u6743\u9650<\/h2>\n<p>\u8ba9\u6211\u4eec\u770b\u770b\u53e6\u4e00\u4e2a\u901a\u8fc7SELinux\u9650\u5236\u7528\u6237\u8bbf\u95ee\u7684\u4f8b\u5b50\u3002\u00a0\u8fd0\u884c\u4ece<strong>\u6839<\/strong>\u4f1a\u8bdd\u8fd9\u4e9b\u547d\u4ee4\u3002<\/p>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cSELinux\u5141\u8bb8\u6620\u5c04\u5230guest_t\u5e10\u6237\u7684\u7528\u6237\u4ece\u5176\u4e3b\u76ee\u5f55\u6267\u884c\u811a\u672c\u3002\u00a0\u6211\u4eec\u53ef\u4ee5\u8fd0\u884c<code class=\" prettyprinted\"><span class=\"pln\">getsebool<\/span><\/code>\u547d\u4ee4\u68c0\u67e5\u5e03\u5c14\u503c\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">getsebool allow_guest_exec_content<\/span><\/code><\/pre>\n<p>\u8f93\u51fa\u663e\u793a\u6807\u5fd7\u5df2\u6253\u5f00\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">guest_exec_content <\/span><span class=\"pun\">--&gt;<\/span><span class=\"pln\"> on<\/span><\/code><\/pre>\n<p>\u4e3a\u4e86\u9a8c\u8bc1\u5b83\u7684\u6548\u679c\uff0c\u8ba9\u6211\u4eec\u9996\u5148\u66f4\u6539\u6211\u4eec\u5728\u672c\u6559\u7a0b\u5f00\u5934\u521b\u5efa\u7684guestuser\u5e10\u6237\u7684SELinux\u7528\u6237\u6620\u5c04\u3002\u00a0\u6211\u4eec\u5c06\u4ee5root\u7528\u6237\u8eab\u4efd\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">semanage login <\/span><span class=\"pun\">-<\/span><span class=\"pln\">a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">s guest_u guestuser<\/span><\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8fd0\u884c\u9a8c\u8bc1\u52a8\u4f5c\u7684<code class=\" prettyprinted\"><span class=\"pln\">semanage login\u00a0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">l<\/span><\/code>\u518d\u6b21\u547d\u4ee4\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">semanage login <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l<\/span><\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0cguestuser\u73b0\u5728\u6620\u5c04\u5230guest_u SELinux\u7528\u6237\u5e10\u6237\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">Login<\/span> <span class=\"typ\">Name<\/span>           <span class=\"typ\">SELinux<\/span> <span class=\"typ\">User<\/span><span class=\"pln\">         MLS<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">MCS <\/span><span class=\"typ\">Range<\/span>        <span class=\"typ\">Service<\/span><span class=\"pln\">\n\n__default__          unconfined_u         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023       <\/span><span class=\"pun\">*<\/span><span class=\"pln\">\nguestuser            guest_u              s0                   <\/span><span class=\"pun\">*<\/span><span class=\"pln\">\nregularuser          user_u               s0                   <\/span><span class=\"pun\">*<\/span><span class=\"pln\">\nroot                 unconfined_u         s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023       <\/span><span class=\"pun\">*<\/span><span class=\"pln\">\nsystem_u             system_u             s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023       <\/span><span class=\"pun\">*<\/span><\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u6709\u4e00\u4e2a\u7ec8\u7aef\u7a97\u53e3\u4f5c\u4e3aguestuser\u6253\u5f00\uff0c\u6211\u4eec\u5c06\u4ece\u5b83\u6ce8\u9500\uff0c\u5e76\u4f5c\u4e3aguestuser\u56de\u5230\u4e00\u4e2a\u65b0\u7684\u7ec8\u7aef\u7a97\u53e3\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u5728\u7528\u6237\u7684\u4e3b\u76ee\u5f55\u4e2d\u521b\u5efa\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\u7684bash\u811a\u672c\u3002\u00a0\u4ee5\u4e0b\u4ee3\u7801\u5757\u9996\u5148\u68c0\u67e5\u4e3b\u76ee\u5f55\uff0c\u7136\u540e\u521b\u5efa\u6587\u4ef6\u5e76\u5728\u63a7\u5236\u53f0\u4e0a\u8bfb\u53d6\u5b83\u3002\u00a0\u6700\u540e\u66f4\u6539\u6267\u884c\u6743\u9650\u3002<\/p>\n<p>\u9a8c\u8bc1\u60a8\u662f\u5426\u5728<code class=\" prettyprinted\"><span class=\"pln\">guestuser<\/span><\/code>\u4e3b\u76ee\u5f55\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">guestuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ pwd<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"str\">\/home\/<\/span><span class=\"pln\">guestuser<\/span><\/code><\/pre>\n<p>\u521b\u5efa\u811a\u672c\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">guestuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ vi myscript<\/span><span class=\"pun\">.<\/span><span class=\"pln\">sh<\/span><\/code><\/pre>\n<p>\u811a\u672c\u5185\u5bb9\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"com\">#!\/bin\/bash<\/span><span class=\"pln\">\necho <\/span><span class=\"str\">\"This is a test script\"<\/span><\/code><\/pre>\n<p>\u4f7f\u811a\u672c\u53ef\u6267\u884c\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">chmod u<\/span><span class=\"pun\">+<\/span><span class=\"pln\">x myscript<\/span><span class=\"pun\">.<\/span><span class=\"pln\">sh<\/span><\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u5c1d\u8bd5\u4ee5guestuser\u8eab\u4efd\u6267\u884c\u811a\u672c\u65f6\uff0c\u5b83\u4f1a\u6309\u9884\u671f\u5de5\u4f5c\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">guestuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ <\/span><span class=\"pun\">~\/<\/span><span class=\"pln\">myscript<\/span><span class=\"pun\">.<\/span><span class=\"pln\">sh<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">This<\/span> <span class=\"kwd\">is<\/span><span class=\"pln\"> a test script<\/span><\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u56de\u5230\u6839\u7ec8\u7aef\u7a97\u53e3\uff0c\u6539\u53d8\u5e03\u5c14\u8bbe\u7f6eallow_guest_exec_content\u81f3<code class=\" prettyprinted\"><span class=\"pln\">off<\/span><\/code>\u548c\u9a8c\u8bc1\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">setsebool allow_guest_exec_content off\ngetsebool allow_guest_exec_content<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">guest\\_<\/span><span class=\"kwd\">exec<\/span><span class=\"pln\">\\_content <\/span><span class=\"pun\">--&gt;<\/span><span class=\"pln\"> off<\/span><\/code><\/pre>\n<p>\u56de\u5230\u4ee5guestuser\u8eab\u4efd\u767b\u5f55\u7684\u63a7\u5236\u53f0\uff0c\u6211\u4eec\u5c1d\u8bd5\u518d\u6b21\u8fd0\u884c\u811a\u672c\u3002\u00a0\u8fd9\u4e00\u6b21\uff0c\u8bbf\u95ee\u88ab\u62d2\u7edd\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">guestuser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ <\/span><span class=\"pun\">~\/<\/span><span class=\"pln\">myscript<\/span><span class=\"pun\">.<\/span><span class=\"pln\">sh<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">-<\/span><span class=\"pln\">bash<\/span><span class=\"pun\">:<\/span> <span class=\"str\">\/home\/<\/span><span class=\"pln\">guestuser<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">myscript<\/span><span class=\"pun\">.<\/span><span class=\"pln\">sh<\/span><span class=\"pun\">:<\/span> <span class=\"typ\">Permission<\/span><span class=\"pln\"> denied<\/span><\/code><\/pre>\n<p>\u6240\u4ee5\u8fd9\u5c31\u662fSELinux\u5982\u4f55\u5728DAC\u4e4b\u4e0a\u5e94\u7528\u989d\u5916\u7684\u5b89\u5168\u5c42\u3002\u00a0\u5373\u4f7f\u7528\u6237\u5bf9\u5728\u5176\u81ea\u5df1\u7684\u4e3b\u76ee\u5f55\u4e2d\u521b\u5efa\u7684\u811a\u672c\u8fdb\u884c\u4e86\u5b8c\u5168\u8bfb\u53d6\uff0c\u5199\u5165\u548c\u6267\u884c\u8bbf\u95ee\uff0c\u5b83\u4eec\u4ecd\u7136\u53ef\u4ee5\u505c\u6b62\u6267\u884c\u5b83\u3002\u00a0\u4f60\u9700\u8981\u5728\u54ea\u91cc\uff1f\u00a0\u597d\u4e86\uff0c\u60f3\u60f3\u4e00\u4e2a\u751f\u4ea7\u7cfb\u7edf\u3002\u00a0\u4f60\u77e5\u9053\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u50cf\u4e3a\u4f60\u516c\u53f8\u5de5\u4f5c\u7684\u4e00\u4e9b\u627f\u5305\u5546\u4e00\u6837\u3002\u00a0\u60a8\u5e0c\u671b\u4ed6\u4eec\u8bbf\u95ee\u670d\u52a1\u5668\u4ee5\u67e5\u770b\u9519\u8bef\u6d88\u606f\u548c\u65e5\u5fd7\u6587\u4ef6\uff0c\u4f46\u4e0d\u5e0c\u671b\u5b83\u4eec\u6267\u884c\u4efb\u4f55shell\u811a\u672c\u3002\u00a0\u4e3a\u6b64\uff0c\u60a8\u53ef\u4ee5\u5148\u542f\u7528SELinux\uff0c\u7136\u540e\u786e\u4fdd\u8bbe\u7f6e\u76f8\u5e94\u7684\u5e03\u5c14\u503c\u3002<\/p>\n<p>\u6211\u4eec\u5c06\u8c08\u8bba\u7684SELinux\u9519\u8bef\u6d88\u606f\u4e0d\u4e45\uff0c\u4f46\u73b0\u5728\uff0c\u5982\u679c\u6211\u4eec\u6025\u4e8e\u770b\u5230\u6b64\u62d2\u7edd\u88ab\u8bb0\u5f55\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u770b<code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">messages<\/span><\/code>\u7684\u6587\u4ef6\u3002\u00a0\u4ece\u6839\u4f1a\u8bdd\u6267\u884c\u6b64\u64cd\u4f5c\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">grep <\/span><span class=\"str\">\"SELinux is preventing\"<\/span> <span class=\"pun\">\/<\/span><span class=\"kwd\">var<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">messages<\/span><\/code><\/pre>\n<p>\u5728\u6211\u4eec\u7684CentOS 7\u670d\u52a1\u5668\u6587\u4ef6\u4e2d\u7684\u6700\u540e\u4e24\u4e2a\u6d88\u606f\u663e\u793a\u8bbf\u95ee\u62d2\u7edd\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">Aug<\/span> <span class=\"lit\">23<\/span> <span class=\"lit\">12<\/span><span class=\"pun\">:<\/span><span class=\"lit\">59<\/span><span class=\"pun\">:<\/span><span class=\"lit\">42<\/span><span class=\"pln\"> localhost setroubleshoot<\/span><span class=\"pun\">:<\/span> <span class=\"typ\">SELinux<\/span> <span class=\"kwd\">is<\/span><span class=\"pln\"> preventing <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">usr<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bash <\/span><span class=\"kwd\">from<\/span><span class=\"pln\"> execute access on the file <\/span><span class=\"pun\">.<\/span> <span class=\"typ\">For<\/span><span class=\"pln\"> complete <\/span><span class=\"typ\">SELinux<\/span><span class=\"pln\"> messages<\/span><span class=\"pun\">.<\/span><span class=\"pln\"> run sealert <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l <\/span><span class=\"lit\">8343a9d2<\/span><span class=\"pun\">-<\/span><span class=\"pln\">ca9d<\/span><span class=\"pun\">-<\/span><span class=\"lit\">49db<\/span><span class=\"pun\">-<\/span><span class=\"lit\">9281<\/span><span class=\"pun\">-<\/span><span class=\"lit\">3bb03a76b71a<\/span>\n<span class=\"typ\">Aug<\/span> <span class=\"lit\">23<\/span> <span class=\"lit\">12<\/span><span class=\"pun\">:<\/span><span class=\"lit\">59<\/span><span class=\"pun\">:<\/span><span class=\"lit\">42<\/span><span class=\"pln\"> localhost python<\/span><span class=\"pun\">:<\/span> <span class=\"typ\">SELinux<\/span> <span class=\"kwd\">is<\/span><span class=\"pln\"> preventing <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">usr<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bash <\/span><span class=\"kwd\">from<\/span><span class=\"pln\"> execute access on the file <\/span><span class=\"pun\">.<\/span><\/code><\/pre>\n<p>\u8be5\u6d88\u606f\u8fd8\u663e\u793a\u4e86\u4e00\u4e2a\u5f88\u957f\u7684ID\u503c\uff0c\u5e76\u5efa\u8bae\u6211\u4eec\u8fd0\u884c<code class=\" prettyprinted\"><span class=\"pln\">sealert<\/span><\/code>\u8fd9\u4e2aID\u547d\u4ee4\u7684\u8be6\u7ec6\u4fe1\u606f\u3002\u00a0\u4ee5\u4e0b\u547d\u4ee4\u663e\u793a\u6b64\uff08\u4f7f\u7528\u60a8\u81ea\u5df1\u7684\u8b66\u62a5ID\uff09\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">sealert <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l <\/span><span class=\"highlight\"><span class=\"lit\">8343a9d2<\/span><span class=\"pun\">-<\/span><span class=\"pln\">ca9d<\/span><span class=\"pun\">-<\/span><span class=\"lit\">49db<\/span><span class=\"pun\">-<\/span><span class=\"lit\">9281<\/span><span class=\"pun\">-<\/span><span class=\"lit\">3bb03a76b71a<\/span><\/span>\n<\/code><\/pre>\n<p>\u4e8b\u5b9e\u4e0a\uff0c\u8f93\u51fa\u5411\u6211\u4eec\u663e\u793a\u4e86\u6709\u5173\u9519\u8bef\u7684\u66f4\u591a\u8be6\u7ec6\u4fe1\u606f\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">SELinux<\/span> <span class=\"kwd\">is<\/span><span class=\"pln\"> preventing <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">usr<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bash <\/span><span class=\"kwd\">from<\/span><span class=\"pln\"> execute access on the file <\/span><span class=\"pun\">.<\/span>\n\n<span class=\"pun\">*****<\/span>  <span class=\"typ\">Plugin<\/span><span class=\"pln\"> catchall_boolean <\/span><span class=\"pun\">(<\/span><span class=\"lit\">89.3<\/span><span class=\"pln\"> confidence<\/span><span class=\"pun\">)<\/span><span class=\"pln\"> suggests   <\/span><span class=\"pun\">******************<\/span>\n\n<span class=\"typ\">If<\/span><span class=\"pln\"> you want to allow guest to <\/span><span class=\"kwd\">exec<\/span><span class=\"pln\"> content\n<\/span><span class=\"typ\">Then<\/span><span class=\"pln\"> you must tell <\/span><span class=\"typ\">SELinux<\/span><span class=\"pln\"> about <\/span><span class=\"kwd\">this<\/span> <span class=\"kwd\">by<\/span><span class=\"pln\"> enabling the <\/span><span class=\"str\">'guest\\_exec\\_content'<\/span> <span class=\"kwd\">boolean<\/span><span class=\"pun\">.<\/span>\n<span class=\"typ\">You<\/span><span class=\"pln\"> can read <\/span><span class=\"str\">'None'<\/span><span class=\"pln\"> man page <\/span><span class=\"kwd\">for<\/span><span class=\"pln\"> more details<\/span><span class=\"pun\">.<\/span>\n<span class=\"typ\">Do<\/span><span class=\"pln\">\nsetsebool <\/span><span class=\"pun\">-<\/span><span class=\"pln\">P guest\\_<\/span><span class=\"kwd\">exec<\/span><span class=\"pln\">\\_content <\/span><span class=\"lit\">1<\/span>\n\n<span class=\"pun\">*****<\/span>  <span class=\"typ\">Plugin<\/span><span class=\"pln\"> catchall <\/span><span class=\"pun\">(<\/span><span class=\"lit\">11.6<\/span><span class=\"pln\"> confidence<\/span><span class=\"pun\">)<\/span><span class=\"pln\"> suggests   <\/span><span class=\"pun\">**************************<\/span>\n\n<span class=\"pun\">...<\/span>\n<\/code><\/pre>\n<p>\u8fd9\u662f\u4e00\u4e2a\u5927\u91cf\u7684\u8f93\u51fa\uff0c\u4f46\u8bf7\u6ce8\u610f\u5f00\u59cb\u65f6\u7684\u51e0\u884c\uff1a<\/p>\n<p><strong>SELinux\u963b\u6b62\/ usr \/ bin \/ bash\u5bf9\u6587\u4ef6\u6267\u884c\u8bbf\u95ee\u3002<\/strong><\/p>\n<p>\u8fd9\u7ed9\u6211\u4eec\u4e00\u4e2a\u5f88\u597d\u7684\u60f3\u6cd5\uff0c\u9519\u8bef\u662f\u4ece\u54ea\u91cc\u6765\u7684\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u7684\u51e0\u884c\u4e5f\u544a\u8bc9\u4f60\u5982\u4f55\u89e3\u51b3\u9519\u8bef\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">If<\/span><span class=\"pln\"> you want to allow guest to <\/span><span class=\"kwd\">exec<\/span><span class=\"pln\"> content\n<\/span><span class=\"typ\">Then<\/span><span class=\"pln\"> you must tell <\/span><span class=\"typ\">SELinux<\/span><span class=\"pln\"> about <\/span><span class=\"kwd\">this<\/span> <span class=\"kwd\">by<\/span><span class=\"pln\"> enabling the <\/span><span class=\"str\">'guest\\_exec\\_content'<\/span> <span class=\"kwd\">boolean<\/span><span class=\"pun\">.<\/span>\n<span class=\"pun\">...<\/span><span class=\"pln\">\nsetsebool <\/span><span class=\"pun\">-<\/span><span class=\"pln\">P guest\\_<\/span><span class=\"kwd\">exec<\/span><span class=\"pln\">\\_content <\/span><span class=\"lit\">1<\/span><\/code><\/pre>\n<h2 id=\"selinux-in-action-3-restricting-access-to-services\">SELinux\u5728\u64cd\u4f5c3\uff1a\u9650\u5236\u5bf9\u670d\u52a1\u7684\u8bbf\u95ee<\/h2>\n<p>\u5728<a href=\"http:\/\/www.howtoing.com\/an-introduction-to-selinux-on-centos-7-part-1-basic-concepts\/\">\u672c\u7cfb\u5217\u7684\u7b2c\u4e00\u90e8\u5206\uff0c<\/a>\u6211\u4eec\u8c08\u5230\u4e86SELinux\u7684\u89d2\u8272\u65f6\uff0c\u6211\u4eec\u5f15\u5165\u4e86\u7528\u6237\uff0c\u89d2\u8272\uff0c\u57df\u548c\u7c7b\u578b\u7684\u57fa\u672c\u672f\u8bed\u3002\u00a0\u73b0\u5728\u8ba9\u6211\u4eec\u770b\u770b\u89d2\u8272\u5982\u4f55\u5728\u9650\u5236\u7528\u6237\u8bbf\u95ee\u65b9\u9762\u53d1\u6325\u4f5c\u7528\u3002\u00a0\u6b63\u5982\u6211\u4eec\u4e4b\u524d\u6240\u8bf4\uff0cSELinux\u4e2d\u7684\u89d2\u8272\u4f4d\u4e8e\u7528\u6237\u548c\u8fdb\u7a0b\u57df\u4e4b\u95f4\uff0c\u5e76\u63a7\u5236\u7528\u6237\u8fdb\u7a0b\u53ef\u4ee5\u8fdb\u5165\u7684\u57df\u3002\u00a0\u5f53\u6211\u4eec\u5728\u6587\u4ef6\u5b89\u5168\u4e0a\u4e0b\u6587\u4e2d\u770b\u5230\u5b83\u4eec\u65f6\uff0c\u89d2\u8272\u5e76\u4e0d\u91cd\u8981\u3002\u00a0\u5bf9\u4e8e\u6587\u4ef6\uff0c\u5b83\u5217\u51fa\u4e86\u4e00\u4e2a\u901a\u7528\u7684\u503cobject_r\u3002\u00a0\u5728\u5904\u7406\u7528\u6237\u548c\u8fdb\u7a0b\u65f6\uff0c\u89d2\u8272\u53d8\u5f97\u91cd\u8981\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u9996\u5148\u786e\u4fddhttpd\u5b88\u62a4\u7a0b\u5e8f\u6ca1\u6709\u5728\u7cfb\u7edf\u4e2d\u8fd0\u884c\u3002\u00a0\u4f5c\u4e3aroot\u7528\u6237\uff0c\u60a8\u53ef\u4ee5\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\u4ee5\u786e\u4fdd\u8fdb\u7a0b\u5df2\u505c\u6b62\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">service httpd stop<\/span><\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5207\u6362\u5230\u6211\u4eec\u4ee5restricteduser\u8eab\u4efd\u767b\u5f55\u7684\u7ec8\u7aef\u7a97\u53e3\uff0c\u5e76\u5c1d\u8bd5\u67e5\u770b\u5b83\u7684SELinux\u5b89\u5168\u4e0a\u4e0b\u6587\u3002\u00a0\u5982\u679c\u60a8\u6ca1\u6709\u6253\u5f00\u7ec8\u7aef\u7a97\u53e3\uff0c\u8bf7\u9488\u5bf9\u7cfb\u7edf\u542f\u52a8\u65b0\u7684\u7ec8\u7aef\u4f1a\u8bdd\uff0c\u5e76\u4ee5\u6211\u4eec\u5728\u672c\u6559\u7a0b\u5f00\u5934\u521b\u5efa\u7684restricteduser\u5e10\u6237\u767b\u5f55\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">restricteduser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ id <\/span><span class=\"pun\">-<\/span><span class=\"pln\">Z\nunconfined_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">unconfined_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">unconfined_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023<\/span><\/code><\/pre>\n<p>\u56e0\u6b64\uff0c\u8be5\u5e10\u6237\u5177\u6709\u4f5c\u4e3aunconfined_u\u7528\u6237\u8fd0\u884c\u5e76\u4e14\u5177\u6709\u8bbf\u95eeunconfined_r\u89d2\u8272\u7684\u9ed8\u8ba4\u884c\u4e3a\u3002\u00a0\u4f46\u662f\uff0c\u6b64\u5e10\u6237\u6ca1\u6709\u6743\u9650\u5728\u7cfb\u7edf\u4e2d\u542f\u52a8\u4efb\u4f55\u8fdb\u7a0b\u3002\u00a0\u4ee5\u4e0b\u4ee3\u7801\u5757\u663e\u793arestricteduser\u5c1d\u8bd5\u542f\u52a8httpd\u5b88\u62a4\u7a0b\u5e8f\u5e76\u83b7\u5f97\u8bbf\u95ee\u88ab\u62d2\u7edd\u9519\u8bef\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">restricteduser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ service httpd start\n<\/span><span class=\"typ\">Redirecting<\/span><span class=\"pln\"> to <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">systemctl start  httpd<\/span><span class=\"pun\">.<\/span><span class=\"pln\">service\n<\/span><span class=\"typ\">Failed<\/span><span class=\"pln\"> to issue method call<\/span><span class=\"pun\">:<\/span> <span class=\"typ\">Access<\/span><span class=\"pln\"> denied<\/span><\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u56de\u5230root\u7528\u6237\u7ec8\u7aef\u7a97\u53e3\uff0c\u5e76\u786e\u4fddrestricteduser\u5e10\u6237\u5df2\u6dfb\u52a0\u5230\/ etc \/ sudoers\u6587\u4ef6\u3002\u00a0\u6b64\u64cd\u4f5c\u5c06\u4f7frestricteduser\u5e10\u6237\u80fd\u591f\u4f7f\u7528root\u6743\u9650\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">visudo<\/span><\/code><\/pre>\n<p>\u7136\u540e\u5728\u6587\u4ef6\u4e2d\uff0c\u6dfb\u52a0\u4ee5\u4e0b\u884c\uff0c\u4fdd\u5b58\u5e76\u9000\u51fa\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">restricteduser ALL<\/span><span class=\"pun\">=(<\/span><span class=\"pln\">ALL<\/span><span class=\"pun\">)<\/span><span class=\"pln\">      ALL<\/span><\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u73b0\u5728\u6ce8\u9500restricteduser\u7ec8\u7aef\u7a97\u53e3\u5e76\u91cd\u65b0\u767b\u5f55\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528sudo\u6743\u9650\u542f\u52a8\u548c\u505c\u6b62httpd\u670d\u52a1\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">restricteduser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ sudo service httpd start<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\">\n<span class=\"typ\">We<\/span><span class=\"pln\"> trust you have received the usual lecture <\/span><span class=\"kwd\">from<\/span><span class=\"pln\"> the <\/span><span class=\"kwd\">local<\/span> <span class=\"typ\">System<\/span>\n<span class=\"typ\">Administrator<\/span><span class=\"pun\">.<\/span> <span class=\"typ\">It<\/span><span class=\"pln\"> usually boils down to these three things<\/span><span class=\"pun\">:<\/span>\n\n    <span class=\"com\">#1) Respect the privacy of others.<\/span>\n    <span class=\"com\">#2) Think before you type.<\/span>\n    <span class=\"com\">#3) With great power comes great responsibility.<\/span>\n\n<span class=\"pun\">[<\/span><span class=\"pln\">sudo<\/span><span class=\"pun\">]<\/span><span class=\"pln\"> password <\/span><span class=\"kwd\">for<\/span><span class=\"pln\"> restricteduser<\/span><span class=\"pun\">:<\/span>\n<span class=\"typ\">Redirecting<\/span><span class=\"pln\"> to <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">systemctl start  httpd<\/span><span class=\"pun\">.<\/span><span class=\"pln\">service<\/span><\/code><\/pre>\n<p>\u7528\u6237\u4e5f\u53ef\u4ee5\u7acb\u5373\u505c\u6b62\u670d\u52a1\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">restricteduser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ sudo service httpd stop<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">Redirecting<\/span><span class=\"pln\"> to <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">systemctl stop  httpd<\/span><span class=\"pun\">.<\/span><span class=\"pln\">service<\/span><\/code><\/pre>\n<p>\u8fd9\u662f\u975e\u5e38\u6b63\u5e38\u7684\uff1a\u7cfb\u7edf\u7ba1\u7406\u5458\u7ed9sudo\u8bbf\u95ee\u4ed6\u4eec\u4fe1\u4efb\u7684\u7528\u6237\u5e10\u6237\u3002\u00a0\u4f46\u662f\uff0c\u5982\u679c\u8981\u505c\u6b62\u6b64\u7279\u5b9a\u7528\u6237\u542f\u52a8httpd\u670d\u52a1\uff0c\u5373\u4f7f\u7528\u6237\u7684\u5e10\u6237\u5728sudoers\u6587\u4ef6\u4e2d\u5217\u51fa\uff0c\u8be5\u600e\u4e48\u529e\uff1f<\/p>\n<p>\u8981\u4e86\u89e3\u5982\u4f55\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u8ba9\u6211\u4eec\u5207\u6362\u56deroot\u7528\u6237\u7684\u7ec8\u7aef\u7a97\u53e3\uff0c\u5e76\u5c06restricteduser\u6620\u5c04\u5230SELinux user_r\u5e10\u6237\u3002\u00a0\u8fd9\u662f\u6211\u4eec\u5728\u53e6\u4e00\u4e2a\u4f8b\u5b50\u4e2d\u4e3a\u5e38\u5ba2\u7528\u6237\u5e10\u6237\u505a\u7684\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">semanage login <\/span><span class=\"pun\">-<\/span><span class=\"pln\">a <\/span><span class=\"pun\">-<\/span><span class=\"pln\">s user_u restricteduser<\/span><\/code><\/pre>\n<p>\u56de\u5230restricteduser\u7684\u7ec8\u7aef\u7a97\u53e3\uff0c\u6211\u4eec\u6ce8\u9500\u5e76\u5728\u65b0\u7684\u7ec8\u7aef\u4f1a\u8bdd\u4e2d\u4f5c\u4e3arestricteduser\u91cd\u65b0\u767b\u5f55\u3002<\/p>\n<p>\u73b0\u5728\uff0crestricteduser\u5df2\u88ab\u9650\u5236user_u\uff08\u8fd9\u610f\u5473\u7740\u89d2\u8272\u89d2\u8272user_r\u548c\u57df\u4e3auser_t\uff09\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u9a8c\u8bc1\u5176\u8bbf\u95ee<code class=\" prettyprinted\"><span class=\"pln\">seinfo<\/span><\/code>\u547d\u4ee4\u4ece\u6211\u4eec\u7684\u6839\u7528\u6237\u7684\u7a97\u53e3\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">seinfo <\/span><span class=\"pun\">-<\/span><span class=\"pln\">uuser_u <\/span><span class=\"pun\">-<\/span><span class=\"pln\">x<\/span><\/code><\/pre>\n<p>\u8f93\u51fa\u663e\u793auser_u\u53ef\u4ee5\u627f\u62c5\u7684\u89d2\u8272\u3002\u00a0\u8fd9\u4e9b\u662fobject_r\u548cuser_r\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">   user_u\n      <\/span><span class=\"kwd\">default<\/span><span class=\"pln\"> level<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> s0\n      range<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> s0\n      roles<\/span><span class=\"pun\">:<\/span><span class=\"pln\">\n         object_r\n         user_r<\/span><\/code><\/pre>\n<p>\u628a\u5b83\u4e00\u6b65\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u8fd0\u884c<code class=\" prettyprinted\"><span class=\"pln\">seinfo<\/span><\/code>\u547d\u4ee4\u68c0\u67e5\u4ec0\u4e48\u57dfuser_r\u89d2\u8272\u88ab\u6388\u6743\u8fdb\u5165\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">seinfo <\/span><span class=\"pun\">-<\/span><span class=\"pln\">ruser_r <\/span><span class=\"pun\">-<\/span><span class=\"pln\">x<\/span><\/code><\/pre>\n<p>\u6709\u591a\u4e2a\u57dfuser_r\u6709\u6743\u8f93\u5165\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">   user_r\n      <\/span><span class=\"typ\">Dominated<\/span> <span class=\"typ\">Roles<\/span><span class=\"pun\">:<\/span><span class=\"pln\">\n         user_r\n      <\/span><span class=\"typ\">Types<\/span><span class=\"pun\">:<\/span>\n         <span class=\"typ\">git_session_t<\/span>\n         <span class=\"typ\">sandbox_x_client_t<\/span>\n         <span class=\"typ\">git_user_content_t<\/span>\n         <span class=\"typ\">virt_content_t<\/span>\n         <span class=\"typ\">policykit_grant_t<\/span>\n         <span class=\"typ\">httpd_user_htaccess_t<\/span>\n         <span class=\"typ\">telepathy_mission_control_home_t<\/span>\n         <span class=\"typ\">qmail_inject_t<\/span>\n         <span class=\"typ\">gnome_home_t<\/span>\n         <span class=\"pun\">...<\/span>\n         <span class=\"pun\">...<\/span><\/code><\/pre>\n<p>\u4f46\u662f\u8fd9\u4e2a\u5217\u8868\u662f\u5426\u663e\u793ahttpd_t\u4f5c\u4e3a\u57df\u4e4b\u4e00\uff1f\u00a0\u8ba9\u6211\u4eec\u4f7f\u7528\u4e00\u4e2a\u8fc7\u6ee4\u5668\u5c1d\u8bd5\u76f8\u540c\u7684\u547d\u4ee4\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">seinfo <\/span><span class=\"pun\">-<\/span><span class=\"pln\">ruser_r <\/span><span class=\"pun\">-<\/span><span class=\"pln\">x <\/span><span class=\"pun\">|<\/span><span class=\"pln\"> grep httpd<\/span><\/code><\/pre>\n<p>\u89d2\u8272\u6709\u6743\u8bbf\u95ee\u7684\u8bb8\u591ahttpd\u76f8\u5173\u57df\uff0c\u4f46httpd_t\u4e0d\u662f\u5176\u4e2d\u4e4b\u4e00\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\">         <span class=\"typ\">httpd_user_htaccess_t<\/span>\n         <span class=\"typ\">httpd_user_script_exec_t<\/span>\n         <span class=\"typ\">httpd_user_ra_content_t<\/span>\n         <span class=\"typ\">httpd_user_rw_content_t<\/span>\n         <span class=\"typ\">httpd_user_script_t<\/span>\n         <span class=\"typ\">httpd_user_content_t<\/span><\/code><\/pre>\n<p>\u4ee5\u6b64\u4e3a\u4f8b\uff0c\u5982\u679crestricteduser\u5e10\u6237\u5c1d\u8bd5\u542f\u52a8httpd\u5b88\u62a4\u7a0b\u5e8f\uff0c\u5219\u5e94\u62d2\u7edd\u8bbf\u95ee\uff0c\u56e0\u4e3ahttpd\u8fdb\u7a0b\u5728httpd_t\u57df\u4e2d\u8fd0\u884c\uff0c\u5e76\u4e14\u4e0d\u662fuser_r\u89d2\u8272\u88ab\u6388\u6743\u8bbf\u95ee\u7684\u57df\u4e4b\u4e00\u3002\u00a0\u800c\u4e14\u6211\u4eec\u77e5\u9053user_u\uff08\u6620\u5c04\u5230restricteduser\uff09\u53ef\u4ee5\u5047\u8bbeuser_r\u89d2\u8272\u3002\u00a0\u5373\u4f7frestricteduser\u5e10\u6237\u5df2\u88ab\u6388\u4e88sudo\u6743\u9650\uff0c\u8fd9\u4e5f\u5e94\u8be5\u5931\u8d25\u3002<\/p>\n<p>\u56de\u5230restricteduser\u5e10\u6237\u7684\u7ec8\u7aef\u7a97\u53e3\uff0c\u6211\u4eec\u5c1d\u8bd5\u7acb\u5373\u542f\u52a8httpd\u5b88\u62a4\u7a0b\u5e8f\uff08\u6211\u4eec\u80fd\u591f\u963b\u6b62\u5b83\uff0c\u56e0\u4e3a\u8be5\u5e10\u6237\u88ab\u6388\u4e88sudo\u6743\u9650\uff09\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">[<\/span><span class=\"pln\">restricteduser@localhost <\/span><span class=\"pun\">~]<\/span><span class=\"pln\">$ sudo service httpd start<\/span><\/code><\/pre>\n<p>\u8bbf\u95ee\u88ab\u62d2\u7edd\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">sudo<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> PERM_SUDOERS<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> setresuid<\/span><span class=\"pun\">(-<\/span><span class=\"lit\">1<\/span><span class=\"pun\">,<\/span> <span class=\"lit\">1<\/span><span class=\"pun\">,<\/span> <span class=\"pun\">-<\/span><span class=\"lit\">1<\/span><span class=\"pun\">):<\/span> <span class=\"typ\">Operation<\/span> <span class=\"kwd\">not<\/span><span class=\"pln\"> permitted<\/span><\/code><\/pre>\n<p>\u6240\u4ee5\uff0c\u8fd8\u6709\u53e6\u4e00\u4e2a\u4f8b\u5b50\uff0c\u8bf4\u660eSELinux\u5982\u4f55\u5de5\u4f5c\uff0c\u5c31\u50cf\u4e00\u4e2a\u7f51\u5b88\u3002<\/p>\n<h2 id=\"selinux-audit-logs\">SELinux\u5ba1\u8ba1\u65e5\u5fd7<\/h2>\n<p>\u4f5c\u4e3a\u7cfb\u7edf\u7ba1\u7406\u5458\uff0c\u60a8\u5c06\u6709\u5174\u8da3\u67e5\u770b\u7531SELinux\u8bb0\u5f55\u7684\u9519\u8bef\u6d88\u606f\u3002\u00a0\u8fd9\u4e9b\u6d88\u606f\u8bb0\u5f55\u5728\u7279\u5b9a\u6587\u4ef6\u4e2d\uff0c\u5e76\u4e14\u53ef\u4ee5\u63d0\u4f9b\u6709\u5173\u62d2\u7edd\u8bbf\u95ee\u7684\u8be6\u7ec6\u4fe1\u606f\u3002\u00a0\u5728CentOS 7\u7cfb\u7edf\u4e2d\uff0c\u60a8\u53ef\u4ee5\u67e5\u770b\u4e24\u4e2a\u6587\u4ef6\uff1a<\/p>\n<ul>\n<li><code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">.<\/span><span class=\"pln\">log<\/span><\/code><\/li>\n<li><code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">messages<\/span><\/code><\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u6587\u4ef6\u5206\u522b\u7531auditd\u5b88\u62a4\u7a0b\u5e8f\u548crsyslogd\u5b88\u62a4\u7a0b\u5e8f\u586b\u5145\u3002\u00a0\u90a3\u4e48\u8fd9\u4e9b\u5b88\u62a4\u8fdb\u7a0b\u505a\u4ec0\u4e48\uff1f\u00a0\u624b\u518c\u9875\u8bf4\uff0cauditd\u5b88\u62a4\u7a0b\u5e8f\u662fLinux\u5ba1\u6838\u7cfb\u7edf\u7684\u7528\u6237\u7a7a\u95f4\u7ec4\u4ef6\uff0crsyslogd\u662f\u63d0\u4f9b\u6d88\u606f\u65e5\u5fd7\u8bb0\u5f55\u652f\u6301\u7684\u7cfb\u7edf\u5b9e\u7528\u7a0b\u5e8f\u3002\u00a0\u7b80\u5355\u5730\u8bf4\uff0c\u8fd9\u4e9b\u5b88\u62a4\u7a0b\u5e8f\u5728\u8fd9\u4e24\u4e2a\u6587\u4ef6\u4e2d\u8bb0\u5f55\u9519\u8bef\u6d88\u606f\u3002<\/p>\n<p>\u8be5<code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">.<\/span><span class=\"pln\">log<\/span><\/code>\u5982\u679cauditd\u5b88\u62a4\u8fdb\u7a0b\u8fd0\u884c\u65f6\u6587\u4ef6\u5c06\u88ab\u4f7f\u7528\u3002\u00a0\u5c06<code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">messages<\/span><\/code>\u00a0\uff0c\u5982\u679cauditd\u8c03\u7528\u505c\u6b62\u5e76rsyslogd\u6b63\u5728\u8fd0\u884c\u4f7f\u7528\u7684\u6587\u4ef6\u3002\u00a0\u5982\u679c\u8fd9\u4e24\u4e2a\u5b88\u62a4\u7a0b\u5e8f\u6b63\u5728\u8fd0\u884c\uff0c\u8fd9\u4e24\u4e2a\u6587\u4ef6\u88ab\u4f7f\u7528\uff1a\u00a0<code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">.<\/span><span class=\"pln\">log<\/span><\/code>\u8bb0\u5f55\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u800c\u4e00\u4e2a\u6613\u4e8e\u9605\u8bfb\u7684\u7248\u672c\u4fdd\u5b58\u5728<code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">messages<\/span><\/code>\u00a0\u3002<\/p>\n<h3 id=\"deciphering-selinux-error-messages\">\u89e3\u5bc6SELinux\u9519\u8bef\u6d88\u606f<\/h3>\n<p>\u6211\u4eec\u5728\u524d\u9762\u7684\u7ae0\u8282\u4e2d\u67e5\u770b\u4e86\u4e00\u4e2aSELinux\u9519\u8bef\u6d88\u606f\uff08\u8bf7\u53c2\u8003\u201cSELinux in Action 2\uff1aRestricting Permissions to Run Scripts\u201d\uff09\u3002\u00a0\u7136\u540e\u6211\u4eec\u4f7f\u7528<code class=\" prettyprinted\"><span class=\"pln\">grep<\/span><\/code>\u547d\u4ee4\u6765\u7b5b\u9009\uff0c\u00a0<code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">messages<\/span><\/code>\u7684\u6587\u4ef6\u3002\u00a0\u5e78\u8fd0\u7684\u662f\uff0cSELinux\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5de5\u5177\uff0c\u4f7f\u751f\u6d3b\u66f4\u5bb9\u6613\u4e00\u4e9b\u3002\u00a0\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4e0d\u5b89\u88c5\u8fd9\u4e9b\u5de5\u5177\uff0c\u5e76\u4e14\u9700\u8981\u5b89\u88c5\u4e00\u4e9b\u8f6f\u4ef6\u5305\uff0c\u60a8\u5e94\u8be5\u5728\u672c\u6559\u7a0b\u7684\u7b2c\u4e00\u90e8\u5206\u4e2d\u5b89\u88c5\u8fd9\u4e9b\u8f6f\u4ef6\u5305\u3002<\/p>\n<p>\u7b2c\u4e00\u4e2a\u547d\u4ee4\u662f<code class=\" prettyprinted\"><span class=\"pln\">ausearch<\/span><\/code>\u00a0\u3002\u00a0\u5982\u679cauditd\u5b88\u62a4\u7a0b\u5e8f\u6b63\u5728\u8fd0\u884c\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u6b64\u547d\u4ee4\u3002\u00a0\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u6211\u4eec\u8bd5\u56fe\u67e5\u770b\u4e0ehttpd\u5b88\u62a4\u7a0b\u5e8f\u76f8\u5173\u7684\u6240\u6709\u9519\u8bef\u6d88\u606f\u3002\u00a0\u786e\u4fdd\u60a8\u5728\u60a8\u7684\u6839\u5e10\u6237\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">ausearch <\/span><span class=\"pun\">-<\/span><span class=\"pln\">m avc <\/span><span class=\"pun\">-<\/span><span class=\"pln\">c httpd<\/span><\/code><\/pre>\n<p>\u5728\u6211\u4eec\u7684\u7cfb\u7edf\u4e2d\u5217\u51fa\u4e86\u4e00\u4e9b\u6761\u76ee\uff0c\u4f46\u6211\u4eec\u5c06\u96c6\u4e2d\u5728\u6700\u540e\u4e00\u4e2a\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">----<\/span><span class=\"pln\">\ntime<\/span><span class=\"pun\">-&gt;<\/span><span class=\"typ\">Thu<\/span> <span class=\"typ\">Aug<\/span> <span class=\"lit\">21<\/span> <span class=\"lit\">16<\/span><span class=\"pun\">:<\/span><span class=\"lit\">42<\/span><span class=\"pun\">:<\/span><span class=\"lit\">17<\/span> <span class=\"lit\">2014<\/span>\n<span class=\"pun\">...<\/span><span class=\"pln\">\ntype<\/span><span class=\"pun\">=<\/span><span class=\"pln\">AVC msg<\/span><span class=\"pun\">=<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">(<\/span><span class=\"lit\">1408603337.115<\/span><span class=\"pun\">:<\/span><span class=\"lit\">914<\/span><span class=\"pun\">):<\/span><span class=\"pln\"> avc<\/span><span class=\"pun\">:<\/span><span class=\"pln\">  denied  <\/span><span class=\"pun\">{<\/span><span class=\"pln\"> getattr <\/span><span class=\"pun\">}<\/span> <span class=\"kwd\">for<\/span><span class=\"pln\">  pid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">10204<\/span><span class=\"pln\"> comm<\/span><span class=\"pun\">=<\/span><span class=\"str\">\"httpd\"<\/span><span class=\"pln\"> path<\/span><span class=\"pun\">=<\/span><span class=\"str\">\"\/www\/html\/index.html\"<\/span><span class=\"pln\"> dev<\/span><span class=\"pun\">=<\/span><span class=\"str\">\"dm-0\"<\/span><span class=\"pln\"> ino<\/span><span class=\"pun\">=<\/span><span class=\"lit\">8445484<\/span><span class=\"pln\"> scontext<\/span><span class=\"pun\">=<\/span><span class=\"pln\">system_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">system_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">httpd_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0 tcontext<\/span><span class=\"pun\">=<\/span><span class=\"pln\">unconfined_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">object_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">default_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0 tclass<\/span><span class=\"pun\">=<\/span><span class=\"pln\">file<\/span><\/code><\/pre>\n<p>\u5373\u4f7f\u6709\u7ecf\u9a8c\u7684\u7cfb\u7edf\u7ba1\u7406\u5458\u53ef\u80fd\u4f1a\u88ab\u8fd9\u6837\u7684\u6d88\u606f\u56f0\u60d1\uff0c\u9664\u975e\u4ed6\u4eec\u77e5\u9053\u4ed6\u4eec\u5728\u5bfb\u627e\u4ec0\u4e48\u3002\u00a0\u4e3a\u4e86\u7406\u89e3\u5b83\uff0c\u8ba9\u6211\u4eec\u5206\u5f00\u6bcf\u4e2a\u5b57\u6bb5\uff1a<\/p>\n<ul>\n<li>\u7c7b\u578b= AVC\u548cAVC\uff1aAVC\u4ee3\u8868<em>\u8bbf\u95ee\u77e2\u91cf\u7f13\u5b58<\/em>\u00a0\u3002\u00a0SELinux\u7f13\u5b58\u8d44\u6e90\u548c\u8fdb\u7a0b\u7684\u8bbf\u95ee\u63a7\u5236\u51b3\u7b56\u3002\u00a0\u6b64\u7f13\u5b58\u79f0\u4e3a\u8bbf\u95ee\u77e2\u91cf\u7f13\u5b58\uff08AVC\uff09\u3002\u00a0\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48SELinux\u8bbf\u95ee\u62d2\u7edd\u6d88\u606f\u4e5f\u79f0\u4e3a\u201cAVC\u62d2\u7edd\u201d\u3002\u00a0\u8fd9\u4e24\u4e2a\u4fe1\u606f\u5b57\u6bb5\u8868\u793a\u6761\u76ee\u6765\u81eaAVC\u65e5\u5fd7\uff0c\u5b83\u662fAVC\u4e8b\u4ef6\u3002<\/li>\n<li>denied {getattr}\uff1a\u5c1d\u8bd5\u7684\u6743\u9650\u548c\u5b83\u83b7\u5f97\u7684\u7ed3\u679c\u3002\u00a0\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cget\u5c5e\u6027\u64cd\u4f5c\u88ab\u62d2\u7edd\u3002<\/li>\n<li>pid = 10204\u3002\u00a0\u8fd9\u662f\u5c1d\u8bd5\u8bbf\u95ee\u7684\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u6807\u8bc6\u3002<\/li>\n<li>comm\uff1a\u8fdb\u7a0bid\u672c\u8eab\u5e76\u4e0d\u610f\u5473\u7740\u592a\u591a\u3002\u00a0comm\u5c5e\u6027\u663e\u793a\u4e86\u8fdb\u7a0b\u547d\u4ee4\u3002\u00a0\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b83\u662fhttpd\u3002\u00a0\u9a6c\u4e0a\u6211\u4eec\u77e5\u9053\u9519\u8bef\u662f\u4eceWeb\u670d\u52a1\u5668\u3002<\/li>\n<li>path\uff1a\u88ab\u8bbf\u95ee\u7684\u8d44\u6e90\u7684\u4f4d\u7f6e\u3002\u00a0\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b83\u662f\/www\/html\/index.html\u4e0b\u7684\u6587\u4ef6\u3002<\/li>\n<li>dev\u548cino\uff1a\u76ee\u6807\u8d44\u6e90\u6240\u5728\u7684\u8bbe\u5907\u53ca\u5176inode\u5730\u5740\u3002<\/li>\n<li>scontext\uff1a\u8fdb\u7a0b\u7684\u5b89\u5168\u4e0a\u4e0b\u6587\u3002\u00a0\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6e90\u5728httpd_t\u57df\u4e0b\u8fd0\u884c\u3002<\/li>\n<li>tcontext\uff1a\u76ee\u6807\u8d44\u6e90\u7684\u5b89\u5168\u4e0a\u4e0b\u6587\u3002\u00a0\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6587\u4ef6\u7c7b\u578b\u4e3adefault_t\u3002<\/li>\n<li>tclass\uff1a\u76ee\u6807\u8d44\u6e90\u7684\u7c7b\u3002\u00a0\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b83\u662f\u4e00\u4e2a\u6587\u4ef6\u3002<\/li>\n<\/ul>\n<p>\u5982\u679c\u4ed4\u7ec6\u770b\uff0c\u8fdb\u7a0b\u57df\u662fhttpd_t\uff0c\u6587\u4ef6\u7684\u7c7b\u578b\u4e0a\u4e0b\u6587\u662fdefault_t\u3002\u00a0\u7531\u4e8ehttpd\u5b88\u62a4\u7a0b\u5e8f\u5728\u53d7\u9650\u57df\u4e2d\u8fd0\u884c\uff0c\u800cSELinux\u7b56\u7565\u89c4\u5b9a\u6b64\u57df\u4e0d\u5177\u6709\u5bf9default_t\u7c7b\u578b\u7684\u6587\u4ef6\u7684\u4efb\u4f55\u8bbf\u95ee\u6743\uff0c\u56e0\u6b64\u8bbf\u95ee\u88ab\u62d2\u7edd\u3002<\/p>\n<p>\u6211\u4eec\u5df2\u7ecf\u770b\u5230\u4e86<code class=\" prettyprinted\"><span class=\"pln\">sealert<\/span><\/code>\u5de5\u5177\u3002\u00a0\u8be5\u547d\u4ee4\u53ef\u4ee5\u7528\u503c\u8bb0\u5f55\u5728\u9519\u8bef\u4fe1\u606f\u7684ID\u88ab\u7528\u6765<code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">messages<\/span><\/code>\u7684\u6587\u4ef6\u3002<\/p>\n<p>\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u7247\u6bb5\uff0c\u6211\u4eec\u518d\u6b21<code class=\" prettyprinted\"><span class=\"pln\">grep<\/span><\/code>\u901a\u8fc7\u7684<code class=\" prettyprinted\"><span class=\"str\">\/var\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">message<\/span><\/code>\u00a0SELinux\u7684\u76f8\u5173\u7684\u9519\u8bef\u6587\u4ef6\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">cat <\/span><span class=\"pun\">\/<\/span><span class=\"kwd\">var<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">log<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">messages <\/span><span class=\"pun\">|<\/span><span class=\"pln\"> grep <\/span><span class=\"str\">\"SELinux is preventing\"<\/span><\/code><\/pre>\n<p>\u5728\u6211\u4eec\u7684\u7cfb\u7edf\u4e2d\uff0c\u6211\u4eec\u770b\u770b\u6700\u540e\u4e00\u4e2a\u9519\u8bef\u3002\u00a0\u8fd9\u662f\u5f53\u6211\u4eec\u7684restricteduser\u5c1d\u8bd5\u8fd0\u884chttpd\u5b88\u62a4\u7a0b\u5e8f\u65f6\u8bb0\u5f55\u7684\u9519\u8bef\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">...<\/span>\n<span class=\"typ\">Aug<\/span> <span class=\"lit\">25<\/span> <span class=\"lit\">11<\/span><span class=\"pun\">:<\/span><span class=\"lit\">59<\/span><span class=\"pun\">:<\/span><span class=\"lit\">46<\/span><span class=\"pln\"> localhost setroubleshoot<\/span><span class=\"pun\">:<\/span> <span class=\"typ\">SELinux<\/span> <span class=\"kwd\">is<\/span><span class=\"pln\"> preventing <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">usr<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">su <\/span><span class=\"kwd\">from<\/span> <span class=\"kwd\">using<\/span><span class=\"pln\"> the setuid capability<\/span><span class=\"pun\">.<\/span> <span class=\"typ\">For<\/span><span class=\"pln\"> complete <\/span><span class=\"typ\">SELinux<\/span><span class=\"pln\"> messages<\/span><span class=\"pun\">.<\/span><span class=\"pln\"> run sealert <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l e9e6c6d8<\/span><span class=\"pun\">-<\/span><span class=\"pln\">f217<\/span><span class=\"pun\">-<\/span><span class=\"lit\">414c<\/span><span class=\"pun\">-<\/span><span class=\"pln\">a14e<\/span><span class=\"pun\">-<\/span><span class=\"lit\">4bccb70cfbce<\/span><\/code><\/pre>\n<p>\u81f3\u4e8e\u5efa\u8bae\uff0c\u6211\u4eec\u8dd1<code class=\" prettyprinted\"><span class=\"pln\">sealert<\/span><\/code>\u7684ID\u503c\uff0c\u5e76\u80fd\u770b\u5230\u7ec6\u8282\uff08\u4f60\u7684ID\u503c\u5e94\u8be5\u662f\u552f\u4e00\u7684\u5bf9\u60a8\u7684\u7cfb\u7edf\uff09\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">sealert <\/span><span class=\"pun\">-<\/span><span class=\"pln\">l <\/span><span class=\"highlight\"><span class=\"pln\">e9e6c6d8<\/span><span class=\"pun\">-<\/span><span class=\"pln\">f217<\/span><span class=\"pun\">-<\/span><span class=\"lit\">414c<\/span><span class=\"pun\">-<\/span><span class=\"pln\">a14e<\/span><span class=\"pun\">-<\/span><span class=\"lit\">4bccb70cfbce<\/span><\/span>\n<\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"typ\">SELinux<\/span> <span class=\"kwd\">is<\/span><span class=\"pln\"> preventing <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">usr<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">su <\/span><span class=\"kwd\">from<\/span> <span class=\"kwd\">using<\/span><span class=\"pln\"> the setuid capability<\/span><span class=\"pun\">.<\/span>\n\n<span class=\"pun\">...<\/span>\n\n<span class=\"typ\">Raw<\/span> <span class=\"typ\">Audit<\/span> <span class=\"typ\">Messages<\/span><span class=\"pln\">\ntype<\/span><span class=\"pun\">=<\/span><span class=\"pln\">AVC msg<\/span><span class=\"pun\">=<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">(<\/span><span class=\"lit\">1408931985.387<\/span><span class=\"pun\">:<\/span><span class=\"lit\">850<\/span><span class=\"pun\">):<\/span><span class=\"pln\"> avc<\/span><span class=\"pun\">:<\/span><span class=\"pln\">  denied  <\/span><span class=\"pun\">{<\/span><span class=\"pln\"> setuid <\/span><span class=\"pun\">}<\/span> <span class=\"kwd\">for<\/span><span class=\"pln\">  pid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">5855<\/span><span class=\"pln\"> comm<\/span><span class=\"pun\">=<\/span><span class=\"str\">\"sudo\"<\/span><span class=\"pln\"> capability<\/span><span class=\"pun\">=<\/span><span class=\"lit\">7<\/span><span class=\"pln\">  scontext<\/span><span class=\"pun\">=<\/span><span class=\"pln\">user_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">user_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">user_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0 tcontext<\/span><span class=\"pun\">=<\/span><span class=\"pln\">user_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">user_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">user_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0 tclass<\/span><span class=\"pun\">=<\/span><span class=\"pln\">capability\n\n\ntype<\/span><span class=\"pun\">=<\/span><span class=\"pln\">SYSCALL msg<\/span><span class=\"pun\">=<\/span><span class=\"pln\">audit<\/span><span class=\"pun\">(<\/span><span class=\"lit\">1408931985.387<\/span><span class=\"pun\">:<\/span><span class=\"lit\">850<\/span><span class=\"pun\">):<\/span><span class=\"pln\"> arch<\/span><span class=\"pun\">=<\/span><span class=\"pln\">x86_64 syscall<\/span><span class=\"pun\">=<\/span><span class=\"pln\">setresuid success<\/span><span class=\"pun\">=<\/span><span class=\"kwd\">no<\/span> <span class=\"kwd\">exit<\/span><span class=\"pun\">=<\/span><span class=\"pln\">EPERM a0<\/span><span class=\"pun\">=<\/span><span class=\"pln\">ffffffff a1<\/span><span class=\"pun\">=<\/span><span class=\"lit\">1<\/span><span class=\"pln\"> a2<\/span><span class=\"pun\">=<\/span><span class=\"pln\">ffffffff a3<\/span><span class=\"pun\">=<\/span><span class=\"lit\">7fae591b92e0<\/span><span class=\"pln\"> items<\/span><span class=\"pun\">=<\/span><span class=\"lit\">0<\/span><span class=\"pln\"> ppid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">5739<\/span><span class=\"pln\"> pid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">5855<\/span><span class=\"pln\"> auid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">1008<\/span><span class=\"pln\"> uid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">0<\/span><span class=\"pln\"> gid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">1008<\/span><span class=\"pln\"> euid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">0<\/span><span class=\"pln\"> suid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">0<\/span><span class=\"pln\"> fsuid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">0<\/span><span class=\"pln\"> egid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">0<\/span><span class=\"pln\"> sgid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">1008<\/span><span class=\"pln\"> fsgid<\/span><span class=\"pun\">=<\/span><span class=\"lit\">0<\/span><span class=\"pln\"> tty<\/span><span class=\"pun\">=<\/span><span class=\"pln\">pts2 ses<\/span><span class=\"pun\">=<\/span><span class=\"lit\">22<\/span><span class=\"pln\"> comm<\/span><span class=\"pun\">=<\/span><span class=\"pln\">sudo exe<\/span><span class=\"pun\">=<\/span><span class=\"str\">\/usr\/<\/span><span class=\"pln\">bin<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">sudo subj<\/span><span class=\"pun\">=<\/span><span class=\"pln\">user_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">user_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">user_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0 key<\/span><span class=\"pun\">=(<\/span><span class=\"kwd\">null<\/span><span class=\"pun\">)<\/span>\n\n<span class=\"typ\">Hash<\/span><span class=\"pun\">:<\/span><span class=\"pln\"> su<\/span><span class=\"pun\">,<\/span><span class=\"typ\">user_t<\/span><span class=\"pun\">,<\/span><span class=\"typ\">user_t<\/span><span class=\"pun\">,<\/span><span class=\"pln\">capability<\/span><span class=\"pun\">,<\/span><span class=\"pln\">setuid<\/span><\/code><\/pre>\n<p>\u6211\u4eec\u5df2\u7ecf\u770b\u5230\u7684\u8f93\u51fa\u7684\u524d\u51e0\u884c\u5982\u4f55<code class=\" prettyprinted\"><span class=\"pln\">sealert<\/span><\/code>\u544a\u8bc9\u6211\u4eec\u6709\u5173\u7684\u8865\u6551\u63aa\u65bd\u3002\u00a0\u4f46\u662f\uff0c\u5982\u679c\u6211\u4eec\u73b0\u5728\u770b\u5230\u8f93\u51fa\u6d41\u7684\u672b\u5c3e\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u201c\u539f\u59cb\u5ba1\u8ba1\u6d88\u606f\u201d\u90e8\u5206\u3002\u00a0\u8fd9\u91cc\u7684\u9879\u76ee\u4ece\u672a\u6765\u7684<code class=\" prettyprinted\"><span class=\"pln\">audit<\/span><span class=\"pun\">.<\/span><span class=\"pln\">log<\/span><\/code>\u6587\u4ef6\uff0c\u8fd9\u662f\u6211\u4eec\u524d\u9762\u6240\u8ba8\u8bba\u7684\uff0c\u6240\u4ee5\u4f60\u53ef\u4ee5\u4f7f\u7528\u8be5\u90e8\u5206\u6765\u5e2e\u52a9\u4f60\u5728\u8fd9\u91cc\u89e3\u91ca\u8f93\u51fa\u3002<\/p>\n<h2 id=\"multilevel-security\">\u591a\u7ea7\u5b89\u5168<\/h2>\n<p>\u591a\u7ea7\u5b89\u5168\u6027\u6216<strong>MLS<\/strong>\u662f\u4e00\u4e2aSELinux\u5b89\u5168\u4e0a\u4e0b\u6587\u7684\u7ec6\u7c92\u5ea6\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<p>\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u5728\u8ba8\u8bba\u8fdb\u7a0b\uff0c\u7528\u6237\u6216\u8d44\u6e90\u7684\u5b89\u5168\u4e0a\u4e0b\u6587\u65f6\uff0c\u6211\u4eec\u4e00\u76f4\u5728\u8c08\u8bba\u4e09\u4e2a\u5c5e\u6027\uff1aSELinux\u7528\u6237\uff0cSELinux\u89d2\u8272\u548cSELinux\u7c7b\u578b\u6216\u57df\u3002\u00a0\u5b89\u5168\u4e0a\u4e0b\u6587\u7684\u7b2c\u56db\u5b57\u6bb5\u793a\u51fa\u4e86<em>\u7075\u654f\u5ea6<\/em>\u548c\u4efb\u9009\u7684\u8d44\u6e90\u7684<em>\u7c7b\u522b<\/em>\u00a0\u3002<\/p>\n<p>\u4e3a\u4e86\u7406\u89e3\u5b83\uff0c\u8ba9\u6211\u4eec\u8003\u8651FTP\u5b88\u62a4\u8fdb\u7a0b\u7684\u914d\u7f6e\u6587\u4ef6\u7684\u5b89\u5168\u4e0a\u4e0b\u6587\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">ls <\/span><span class=\"pun\">-<\/span><span class=\"pln\">Z <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">etc<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">vsftpd<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">vsftpd<\/span><span class=\"pun\">.<\/span><span class=\"pln\">conf<\/span><\/code><\/pre>\n<p>\u5b89\u5168\u4e0a\u4e0b\u6587\u7684\u7b2c\u56db\u4e2a\u5b57\u6bb5\u663e\u793as0\u7684\u654f\u611f\u6027\u3002<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pun\">-<\/span><span class=\"pln\">rw<\/span><span class=\"pun\">-------.<\/span><span class=\"pln\"> root root system_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">object_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">etc_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0       <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">etc<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">vsftpd<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">vsftpd<\/span><span class=\"pun\">.<\/span><span class=\"pln\">conf<\/span><\/code><\/pre>\n<p>\u7075\u654f\u5ea6\u662f<em>\u5206\u5c42<\/em>\u591a\u7ea7\u5b89\u5168\u673a\u5236\u7684\u4e00\u90e8\u5206\u3002\u00a0\u6309\u5c42\u6b21\u7ed3\u6784\uff0c\u6211\u4eec\u7684\u610f\u601d\u662f\u654f\u611f\u7ea7\u522b\u53ef\u4ee5\u66f4\u6df1\u5165\u548c\u66f4\u6df1\u7684\u6587\u4ef6\u7cfb\u7edf\u4e2d\u66f4\u5b89\u5168\u7684\u5185\u5bb9\u3002\u00a0\u7ea7\u522b0\uff08\u7531s0\u63cf\u7ed8\uff09\u662f\u6700\u4f4e\u7075\u654f\u5ea6\u7ea7\u522b\uff0c\u53ef\u4ee5\u8bf4\u662f\u201c\u516c\u5171\u201d\u3002\u00a0\u53ef\u4ee5\u5b58\u5728\u5177\u6709\u8f83\u9ad8s\u503c\u7684\u5176\u4ed6\u7075\u654f\u5ea6\u6c34\u5e73\uff1a\u4f8b\u5982\uff0c\u5185\u90e8\uff0c\u673a\u5bc6\u6216\u8c03\u8282\u53ef\u4ee5\u5206\u522b\u7531s1\uff0cs2\u548cs3\u63cf\u8ff0\u3002\u00a0\u6b64\u6620\u5c04\u4e0d\u53d7\u7b56\u7565\u89c4\u5b9a\uff1a\u7cfb\u7edf\u7ba1\u7406\u5458\u53ef\u4ee5\u914d\u7f6e\u6bcf\u4e2a\u654f\u611f\u7ea7\u522b\u7684\u542b\u4e49\u3002<\/p>\n<p>\u5f53\u542f\u7528\u4e86SELinux\u7cfb\u7edf\u4f7f\u7528MLS\u5176\u7b56\u7565\u7c7b\u578b\uff08\u5728\u6240\u914d\u7f6e<code class=\" prettyprinted\"><span class=\"str\">\/etc\/<\/span><span class=\"pln\">selinux<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">config<\/span><\/code>\u6587\u4ef6\uff09\uff0c\u5b83\u53ef\u4ee5\u4e0e\u7075\u654f\u5ea6\u7684\u7279\u5b9a\u7ea7\u522b\u6807\u8bb0\u67d0\u4e9b\u6587\u4ef6\u548c\u8fdb\u7a0b\u3002\u00a0\u6700\u4f4e\u7535\u5e73\u79f0\u4e3a\u201c\u7535\u6d41\u7075\u654f\u5ea6\u201d\uff0c\u6700\u9ad8\u7535\u5e73\u79f0\u4e3a\u201c\u95f4\u9699\u7075\u654f\u5ea6\u201d\u3002<\/p>\n<p>\u53bb\u624b\u5728\u624b\u7684\u7075\u654f\u5ea6\u662f\u8d44\u6e90\u7684<em>\u79cd\u7c7b<\/em>\u00a0\uff0c\u7528C\u8868\u793a\u3002\u00a0\u7c7b\u522b\u53ef\u4ee5\u88ab\u89c6\u4e3a\u5206\u914d\u7ed9\u8d44\u6e90\u7684\u6807\u7b7e\u3002\u00a0\u7c7b\u522b\u7684\u793a\u4f8b\u53ef\u4ee5\u662f\u90e8\u95e8\u540d\u79f0\uff0c\u5ba2\u6237\u540d\u79f0\uff0c\u9879\u76ee\u7b49\u3002\u5206\u7c7b\u7684\u76ee\u7684\u662f\u8fdb\u4e00\u6b65\u5fae\u8c03\u8bbf\u95ee\u63a7\u5236\u3002\u00a0\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u5bf9\u6765\u81ea\u4e24\u4e2a\u4e0d\u540c\u5185\u90e8\u90e8\u95e8\u7684\u7528\u6237\u7684\u5177\u6709\u673a\u5bc6\u654f\u611f\u6027\u7684\u67d0\u4e9b\u6587\u4ef6\u8fdb\u884c\u6807\u8bb0\u3002<\/p>\n<p>\u5bf9\u4e8eSELinux\u5b89\u5168\u4e0a\u4e0b\u6587\uff0c\u654f\u611f\u6027\u548c\u7c7b\u522b\u5728\u5b9e\u73b0\u7c7b\u522b\u65f6\u4e00\u8d77\u5de5\u4f5c\u3002\u00a0\u5f53\u4f7f\u7528\u7075\u654f\u5ea6\u7ea7\u522b\u8303\u56f4\u65f6\uff0c\u683c\u5f0f\u662f\u663e\u793a\u7531\u8fde\u5b57\u7b26\u5206\u9694\u7684\u7075\u654f\u5ea6\u7ea7\u522b\uff08\u4f8b\u5982\uff0cs0-s2\uff09\u3002\u00a0\u4f7f\u7528\u7c7b\u522b\u65f6\uff0c\u8303\u56f4\u5c06\u5728\u5176\u95f4\u663e\u793a\u4e00\u4e2a\u70b9\u3002\u00a0\u7075\u654f\u5ea6\u548c\u7c7b\u522b\u503c\u7528\u5192\u53f7\uff08:)\u5206\u9694\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u7075\u654f\u5ea6\/\u7c7b\u522b\u5bf9\u7684\u793a\u4f8b\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">user_u<\/span><span class=\"pun\">:<\/span><span class=\"pln\">object_r<\/span><span class=\"pun\">:<\/span><span class=\"typ\">etc_t<\/span><span class=\"pun\">:<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c2  <\/span><\/code><\/pre>\n<p>\u8fd9\u91cc\u53ea\u6709\u4e00\u4e2a\u7075\u654f\u5ea6\u7ea7\u522b\uff0c\u8fd9\u662fs0\u3002\u00a0\u7c7b\u522b\u7ea7\u522b\u4e5f\u53ef\u4ee5\u5199\u4e3ac0-c2\u3002<\/p>\n<p>\u90a3\u4e48\uff0c\u60a8\u5728\u54ea\u91cc\u5206\u914d\u60a8\u7684\u7c7b\u522b\u7ea7\u522b\uff1f\u00a0\u8ba9\u6211\u4eec\u6765\u770b\u770b\u4ece\u7ec6\u8282<code class=\" prettyprinted\"><span class=\"str\">\/etc\/<\/span><span class=\"pln\">selinux<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">targeted<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">setrans<\/span><span class=\"pun\">.<\/span><span class=\"pln\">conf<\/span><\/code>\u6587\u4ef6\uff1a<\/p>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"pln\">cat <\/span><span class=\"pun\">\/<\/span><span class=\"pln\">etc<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">selinux<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">targeted<\/span><span class=\"pun\">\/<\/span><span class=\"pln\">setrans<\/span><span class=\"pun\">.<\/span><span class=\"pln\">conf<\/span><\/code><\/pre>\n<pre class=\"code-pre  prettyprinted\"><code class=\" prettyprinted\"><span class=\"com\">#<\/span>\n<span class=\"com\"># Multi-Category Security translation table for SELinux<\/span>\n<span class=\"com\">#<\/span>\n<span class=\"com\">#<\/span>\n<span class=\"com\"># Objects can be categorized with 0-1023 categories defined by the admin.<\/span>\n<span class=\"com\"># Objects can be in more than one category at a time.<\/span>\n<span class=\"com\"># Categories are stored in the system as c0-c1023.  Users can use this<\/span>\n<span class=\"com\"># table to translate the categories into a more meaningful output.<\/span>\n<span class=\"com\"># Examples:<\/span>\n<span class=\"com\"># s0:c0=CompanyConfidential<\/span>\n<span class=\"com\"># s0:c1=PatientRecord<\/span>\n<span class=\"com\"># s0:c2=Unclassified<\/span>\n<span class=\"com\"># s0:c3=TopSecret<\/span>\n<span class=\"com\"># s0:c1,c3=CompanyConfidentialRedHat<\/span><span class=\"pln\">\ns0<\/span><span class=\"pun\">=<\/span><span class=\"typ\">SystemLow<\/span><span class=\"pln\">\ns0<\/span><span class=\"pun\">-<\/span><span class=\"pln\">s0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023<\/span><span class=\"pun\">=<\/span><span class=\"typ\">SystemLow<\/span><span class=\"pun\">-<\/span><span class=\"typ\">SystemHigh<\/span><span class=\"pln\">\ns0<\/span><span class=\"pun\">:<\/span><span class=\"pln\">c0<\/span><span class=\"pun\">.<\/span><span class=\"pln\">c1023<\/span><span class=\"pun\">=<\/span><span class=\"typ\">SystemHigh<\/span><\/code><\/pre>\n<p>\u6211\u4eec\u4e0d\u4f1a\u5728\u8fd9\u91cc\u8ba8\u8bba\u654f\u611f\u6027\u548c\u7c7b\u522b\u7684\u7ec6\u8282\u3002\u00a0\u53ea\u77e5\u9053\u88ab\u5141\u8bb8\u7684\u5904\u7406\u8bfb\u8bbf\u95ee\u8d44\u6e90\uff0c\u53ea\u6709\u5f53\u5b83\u7684\u7075\u654f\u5ea6\u548c\u7c7b\u522b\u6c34\u5e73\u6bd4\u8d44\u6e90\uff08\u5373\u8fc7\u7a0b\u57df<em>\u652f\u914d<\/em>\u7740\u8d44\u6e90\u7c7b\u578b\uff09\u7684\u9ad8\u3002\u00a0\u5f53\u5176\u654f\u611f\u5ea6\/\u7c7b\u522b\u7ea7\u522b\u5c0f\u4e8e\u8d44\u6e90\u7684\u654f\u611f\u5ea6\/\u7c7b\u522b\u7ea7\u522b\u65f6\uff0c\u8be5\u8fdb\u7a0b\u53ef\u4ee5\u5199\u5165\u8d44\u6e90\u3002<\/p>\n<h3 id=\"conclusion\">\u7ed3\u8bba<\/h3>\n<p>\u6211\u4eec\u8bd5\u56fe\u5728\u8fd9\u4e2a\u4e09\u90e8\u5206\u7cfb\u5217\u7684\u77ed\u671f\u5185\u6db5\u76d6\u5173\u4e8eLinux\u5b89\u5168\u7684\u4e00\u4e2a\u5e7f\u6cdb\u7684\u8bdd\u9898\u3002\u00a0\u5982\u679c\u6211\u4eec\u73b0\u5728\u770b\u770b\u6211\u4eec\u7684\u7cfb\u7edf\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u7b80\u5355\u7684Apache Web\u670d\u52a1\u5668\uff0c\u5176\u5185\u5bb9\u4ece\u81ea\u5b9a\u4e49\u76ee\u5f55\u63d0\u4f9b\u3002\u00a0\u6211\u4eec\u8fd8\u6709\u4e00\u4e2aFTP\u5b88\u62a4\u8fdb\u7a0b\u5728\u6211\u4eec\u7684\u670d\u52a1\u5668\u4e0a\u8fd0\u884c\u3002\u00a0\u5df2\u521b\u5efa\u51e0\u4e2a\u7528\u6237\u7684\u8bbf\u95ee\u53d7\u5230\u9650\u5236\u7684\u7528\u6237\u3002\u00a0\u5728\u6211\u4eec\u4e00\u8d77\u5de5\u4f5c\u65f6\uff0c\u6211\u4eec\u4f7f\u7528SELinux\u8f6f\u4ef6\u5305\uff0c\u6587\u4ef6\u548c\u547d\u4ee4\u6765\u6ee1\u8db3\u6211\u4eec\u7684\u5b89\u5168\u9700\u6c42\u3002\u00a0\u4e00\u8def\u4e0a\uff0c\u6211\u4eec\u8fd8\u5b66\u4e60\u4e86\u5982\u4f55\u67e5\u770bSELinux\u9519\u8bef\u6d88\u606f\u5e76\u4e86\u89e3\u5b83\u4eec\u3002<\/p>\n<p>\u6574\u4e2a\u4e66\u5df2\u7ecf\u5199\u5728SELinux\u4e3b\u9898\u4e0a\uff0c\u4f60\u53ef\u4ee5\u82b1\u8d39\u51e0\u4e2a\u5c0f\u65f6\u8bd5\u56fe\u627e\u51fa\u4e0d\u540c\u7684\u5305\uff0c\u914d\u7f6e\u6587\u4ef6\uff0c\u547d\u4ee4\u53ca\u5176\u5bf9\u5b89\u5168\u6027\u7684\u5f71\u54cd\u3002\u00a0\u90a3\u4e48\u4f60\u4ece\u8fd9\u91cc\u53bb\u54ea\u91cc\uff1f<\/p>\n<p>\u6211\u8981\u505a\u7684\u4e00\u4ef6\u4e8b\u662f\u5c0f\u5fc3\u4f60\u4e0d\u8981\u5728\u751f\u4ea7\u7cfb\u7edf\u4e0a\u6d4b\u8bd5\u4efb\u4f55\u4e1c\u897f\u3002\u00a0\u4e00\u65e6\u638c\u63e1\u4e86\u57fa\u7840\u77e5\u8bc6\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7\u5728\u751f\u4ea7\u7bb1\u7684\u6d4b\u8bd5\u526f\u672c\u4e0a\u542f\u7528\u5b83\u6765\u5f00\u59cb\u4f7f\u7528SELinux\u3002\u00a0\u786e\u4fdd\u5ba1\u8ba1\u5b88\u62a4\u7a0b\u5e8f\u6b63\u5728\u8fd0\u884c\uff0c\u5e76\u7559\u610f\u9519\u8bef\u6d88\u606f\u3002\u00a0\u68c0\u67e5\u4efb\u4f55\u62d2\u7edd\u670d\u52a1\u542f\u52a8\u7684\u62d2\u7edd\u3002\u00a0\u4f7f\u7528\u5e03\u5c14\u8bbe\u7f6e\u3002\u00a0\u5217\u51fa\u4fdd\u62a4\u7cfb\u7edf\u7684\u53ef\u80fd\u6b65\u9aa4\uff0c\u4f8b\u5982\u521b\u5efa\u6620\u5c04\u5230\u6700\u4f4e\u6743\u9650SELinux\u5e10\u6237\u7684\u65b0\u7528\u6237\u6216\u5c06\u6b63\u786e\u7684\u4e0a\u4e0b\u6587\u5e94\u7528\u4e8e\u975e\u6807\u51c6\u6587\u4ef6\u4f4d\u7f6e\u3002\u00a0\u4e86\u89e3\u5982\u4f55\u89e3\u5bc6\u9519\u8bef\u65e5\u5fd7\u3002\u00a0\u68c0\u67e5\u5404\u79cd\u5b88\u62a4\u7a0b\u5e8f\u7684\u7aef\u53e3\uff1a\u5982\u679c\u4f7f\u7528\u975e\u6807\u51c6\u7aef\u53e3\uff0c\u8bf7\u786e\u4fdd\u5b83\u4eec\u5df2\u6b63\u786e\u5206\u914d\u7ed9\u7b56\u7565\u3002<\/p>\n<p>\u5b83\u5c06\u4e0e\u65f6\u95f4\u548c\u5b9e\u8df5\u4e00\u8d77\u3002\u00a0\ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ecb\u7ecd 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SELinux\u7528\u6237 SELinux\u7528\u6237\u662f\u4e0e\u666e\u901aLinux\u7528\u6237\u5e10\u6237\u4e0d\u540c\u7684\u5b9e\u4f53\uff0c\u5305\u62ecroot\u5e10\u6237\u3002\u00a0SELinux\u7528\u6237\u4e0d\u662f\u4f7f\u7528\u7279\u6b8a\u547d\u4ee4\u521b\u5efa\u7684\uff0c\u4e5f\u4e0d\u5177\u6709\u5bf9\u670d\u52a1\u5668\u7684\u81ea\u5df1\u7684\u767b\u5f55\u8bbf\u95ee\u6743\u9650\u3002\u00a0\u76f8\u53cd\uff0cSELinux\u7528\u6237\u5728\u5f15\u5bfc\u65f6\u52a0\u8f7d\u5230\u5185\u5b58\u7684\u7b56\u7565\u4e2d\u5b9a\u4e49\uff0c\u5e76\u4e14\u53ea\u6709\u5c11\u6570\u7528\u6237\u3002\u00a0\u7528\u6237\u540d\u79f0\u4ee5_u\u00a0\uff0c\u5c31\u50cf\u7c7b\u578b\u6216\u57df\u540d\u7ed3\u675f\u4e0e_t\u548c\u89d2\u8272\u7ed3\u675f_r\u00a0\u3002\u00a0\u4e0d\u540c\u7684SELinux\u7528\u6237\u5728\u7cfb\u7edf\u4e2d\u5177\u6709\u4e0d\u540c\u7684\u6743\u9650\uff0c\u8fd9\u5c31\u662f\u5b83\u4eec\u7684\u7528\u9014\u3002 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