\u56de\u5230Kernel 2.6 \u65f6\u4ee3\uff0c\u90a3\u65f6\u5019\u5f15\u5165\u4e86\u4e00\u4e2a\u65b0\u7684\u5b89\u5168\u7cfb\u7edf\uff0c\u7528\u4ee5\u63d0\u4f9b\u8bbf\u95ee\u63a7\u5236\u5b89\u5168\u7b56\u7565\u7684\u673a\u5236\u3002\u8fd9\u4e2a\u7cfb\u7edf\u5c31\u662fSecurity Enhanced Linux (SELinux)\uff0c\u5b83\u662f\u7531\u7f8e\u56fd\u56fd\u5bb6\u5b89\u5168\u5c40\uff08NSA\uff09\u8d21\u732e\u7684\uff0c\u5b83\u4e3aLinux\u5185\u6838\u5b50\u7cfb\u7edf\u5f15\u5165\u4e86\u4e00\u4e2a\u5065\u58ee\u7684\u5f3a\u5236\u63a7\u5236\u8bbf\u95eeMandatory Access Control\u67b6\u6784\u3002<\/p>\n

\u5728\u6211\u5f00\u59cb\u4e4b\u524d\uff0c\u4f60\u5e94\u8be5\u5df2\u7ecf\u4e86\u89e3\u7684\u662fSELinux\u4e3b\u8981\u662f\u7ea2\u5e3dRed Hat Linux\u4ee5\u53ca\u5b83\u7684\u884d\u751f\u53d1\u884c\u7248\u4e0a\u7684\u4e00\u4e2a\u5de5\u5177\u3002\u7c7b\u4f3c\u5730\uff0c Ubuntu \u548c SUSE\uff08\u4ee5\u53ca\u5b83\u4eec\u7684\u884d\u751f\u53d1\u884c\u7248\uff09\u4f7f\u7528\u7684\u662f AppArmor\u3002SELinux\u548cAppArmor \u6709\u663e\u8457\u7684\u4e0d\u540c\u3002\u4f60\u53ef\u4ee5\u5728SUSE\uff0copenSUSE\uff0cUbuntu\u7b49\u7b49\u53d1\u884c\u7248\u4e0a\u5b89\u88c5SELinux\uff0c\u4f46\u8fd9\u662f\u9879\u96be\u4ee5\u7f6e\u4fe1\u7684\u6311\u6218\uff0c\u9664\u975e\u4f60\u5341\u5206\u7cbe\u901a Linux\uff0c\u8bf4\u4e86\u8fd9\u4e48\u591a\uff0c\u8ba9\u6211\u6765\u5411\u4f60\u4ecb\u7ecdSELinux\u3002<\/p>\n

DAC vs. MAC<\/strong><\/div>\n
Linux\u4e0a\u4f20\u7edf\u7684\u8bbf\u95ee\u63a7\u5236\u6807\u51c6\u662f\u81ea\u4e3b\u8bbf\u95ee\u63a7\u5236Discretionary Access Control\uff08DAC\uff09\u3002\u5728\u8fd9\u79cd\u5f62\u5f0f\u4e0b\uff0c\u4e00\u4e2a\u8f6f\u4ef6\u6216\u5b88\u62a4\u8fdb\u7a0b\u4ee5User ID\uff08UID\uff09\u6216Set owner User ID\uff08SUID\uff09\u7684\u8eab\u4efd\u8fd0\u884c\uff0c\u5e76\u4e14\u62e5\u6709\u8be5\u7528\u6237\u7684\u76ee\u6807\uff08\u6587\u4ef6\u3001\u5957\u63a5\u5b57\u3001\u4ee5\u53ca\u5176\u5b83\u8fdb\u7a0b\uff09\u6743\u9650\u3002\u8fd9\u4f7f\u5f97\u6076\u610f\u4ee3\u7801\u5f88\u5bb9\u6613\u8fd0\u884c\u5728\u7279\u5b9a\u6743\u9650\u4e4b\u4e0b\uff0c\u4ece\u800c\u53d6\u5f97\u8bbf\u95ee\u5173\u952e\u7684\u5b50\u7cfb\u7edf\u7684\u6743\u9650\u3002<\/p>\n
\u53e6\u4e00\u65b9\u9762\uff0c\u5f3a\u5236\u8bbf\u95ee\u63a7\u5236Mandatory Access Control\uff08MAC\uff09\u57fa\u4e8e\u4fdd\u5bc6\u6027\u548c\u5b8c\u6574\u6027\u5f3a\u5236\u4fe1\u606f\u7684\u9694\u79bb\u4ee5\u9650\u5236\u7834\u574f\u3002\u8be5\u9650\u5236\u5355\u5143\u72ec\u7acb\u4e8e\u4f20\u7edf\u7684Linux\u5b89\u5168\u673a\u5236\u8fd0\u4f5c\uff0c\u5e76\u4e14\u6ca1\u6709\u8d85\u7ea7\u7528\u6237\u7684\u6982\u5ff5\u3002<\/p>\n
SELinux\u5982\u4f55\u5de5\u4f5c<\/strong><\/div>\n
\u8003\u8651\u4e00\u4e0bSELinux\u7684\u76f8\u5173\u6982\u5ff5:<\/p>\n
\u4e3b\u4f53Subjects<\/li>\n
\u76ee\u6807Objects<\/li>\n
\u7b56\u7565Policy<\/li>\n
\u6a21\u5f0fMode<\/li>\n
\u5f53\u4e00\u4e2a\u4e3b\u4f53Subject\uff08\u5982\u4e00\u4e2a\u7a0b\u5e8f\uff09\u5c1d\u8bd5\u8bbf\u95ee\u4e00\u4e2a\u76ee\u6807Object\uff08\u5982\u4e00\u4e2a\u6587\u4ef6\uff09\uff0cSELinux\u5b89\u5168\u670d\u52a1\u5668SELinux Security Server\uff08\u5728\u5185\u6838\u4e2d\uff09\u4ece\u7b56\u7565\u6570\u636e\u5e93Policy Database\u4e2d\u8fd0\u884c\u4e00\u4e2a\u68c0\u67e5\u3002\u57fa\u4e8e\u5f53\u524d\u7684\u6a21\u5f0fmode\uff0c\u5982\u679c SELinux \u5b89\u5168\u670d\u52a1\u5668\u6388\u4e88\u6743\u9650\uff0c\u8be5\u4e3b\u4f53\u5c31\u80fd\u591f\u8bbf\u95ee\u8be5\u76ee\u6807\u3002\u5982\u679cSELinux\u5b89\u5168\u670d\u52a1\u5668\u62d2\u7edd\u4e86\u6743\u9650\uff0c\u5c31\u4f1a\u5728\/var\/log\/messages\u4e2d\u8bb0\u5f55\u4e00\u6761\u62d2\u7edd\u4fe1\u606f\u3002<\/p>\n
\u542c\u8d77\u6765\u76f8\u5bf9\u6bd4\u8f83\u7b80\u5355\u662f\u4e0d\u662f\uff1f\u5b9e\u9645\u4e0a\u8fc7\u7a0b\u8981\u66f4\u52a0\u590d\u6742\uff0c\u4f46\u4e3a\u4e86\u7b80\u5316\u4ecb\u7ecd\uff0c\u53ea\u5217\u51fa\u4e86\u91cd\u8981\u7684\u6b65\u9aa4\u3002<\/p>\n
\u6a21\u5f0f<\/strong><\/div>\n
SELinux \u6709\u4e09\u4e2a\u6a21\u5f0f\uff08\u53ef\u4ee5\u7531\u7528\u6237\u8bbe\u7f6e\uff09\u3002\u8fd9\u4e9b\u6a21\u5f0f\u5c06\u89c4\u5b9a SELinux \u5728\u4e3b\u4f53\u8bf7\u6c42\u65f6\u5982\u4f55\u5e94\u5bf9\u3002\u8fd9\u4e9b\u6a21\u5f0f\u662f\uff1a<\/p>\n
Enforcing \u5f3a\u5236\u2014 SELinux \u7b56\u7565\u5f3a\u5236\u6267\u884c\uff0c\u57fa\u4e8e SELinux \u7b56\u7565\u89c4\u5219\u6388\u4e88\u6216\u62d2\u7edd\u4e3b\u4f53\u5bf9\u76ee\u6807\u7684\u8bbf\u95ee<\/li>\n
Permissive \u5bbd\u5bb9\u2014 SELinux \u7b56\u7565\u4e0d\u5f3a\u5236\u6267\u884c\uff0c\u4e0d\u5b9e\u9645\u62d2\u7edd\u8bbf\u95ee\uff0c\u4f46\u4f1a\u6709\u62d2\u7edd\u4fe1\u606f\u5199\u5165\u65e5\u5fd7<\/li>\n
Disabled \u7981\u7528\u2014 \u5b8c\u5168\u7981\u7528SELinux<\/li>\n
$\"getenforce_Enforcing\"$ (getenforce\u547d\u4ee4\u663e\u793aSELinux\u7684\u72b6\u6001\u662fEnforcing\u542f\u7528\u72b6\u6001)<\/span><\/p>\n
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5927\u90e8\u5206\u7cfb\u7edf\u7684SELinux\u8bbe\u7f6e\u4e3aEnforcing\u3002\u4f60\u8981\u5982\u4f55\u77e5\u9053\u4f60\u7684\u7cfb\u7edf\u5f53\u524d\u662f\u4ec0\u4e48\u6a21\u5f0f\uff1f\u4f60\u53ef\u4ee5\u4f7f\u7528\u4e00\u6761\u7b80\u5355\u7684\u547d\u4ee4\u6765\u67e5\u770b\uff0c\u8fd9\u6761\u547d\u4ee4\u5c31\u662f getenforce\u3002\u8fd9\u4e2a\u547d\u4ee4\u7528\u8d77\u6765\u96be\u4ee5\u7f6e\u4fe1\u7684\u7b80\u5355\uff08\u56e0\u4e3a\u5b83\u4ec5\u4ec5\u7528\u6765\u62a5\u544aSELinux\u7684\u6a21\u5f0f\uff09\u3002\u8981\u4f7f\u7528\u8fd9\u4e2a\u5de5\u5177\uff0c\u6253\u5f00\u4e00\u4e2a\u7ec8\u7aef\u7a97\u53e3\u5e76\u6267\u884c getenforce \u547d\u4ee4\u3002\u547d\u4ee4\u4f1a\u8fd4\u56de Enforcing\u3001Permissive\uff0c\u6216\u8005Disabled\uff08\u89c1\u4e0a\u56fe\uff09\u3002<\/p>\n
\u8bbe\u7f6eSELinux\u7684\u6a21\u5f0f\u5b9e\u9645\u4e0a\u5f88\u7b80\u5355\u2014\u2014\u53d6\u51b3\u4e8e\u4f60\u60f3\u8bbe\u7f6e\u4ec0\u4e48\u6a21\u5f0f\u3002\u8bb0\u4f4f\uff1a\u6c38\u8fdc\u4e0d\u63a8\u8350\u5173\u95ed SELinux\u3002\u4e3a\u4ec0\u4e48\uff1f\u5f53\u4f60\u8fd9\u4e48\u505a\u4e86\uff0c\u5c31\u4f1a\u51fa\u73b0\u8fd9\u79cd\u53ef\u80fd\u6027\uff1a\u4f60\u78c1\u76d8\u4e0a\u7684\u6587\u4ef6\u53ef\u80fd\u4f1a\u88ab\u6253\u4e0a\u9519\u8bef\u7684\u6743\u9650\u6807\u7b7e\uff0c\u9700\u8981\u4f60\u91cd\u65b0\u6807\u8bb0\u6743\u9650\u624d\u80fd\u4fee\u590d\u3002\u800c\u4e14\u4f60\u65e0\u6cd5\u4fee\u6539\u4e00\u4e2a\u4ee5 Disabled \u6a21\u5f0f\u542f\u52a8\u7684\u7cfb\u7edf\u7684\u6a21\u5f0f\u3002\u4f60\u7684\u6700\u4f73\u6a21\u5f0f\u662fEnforcing\u6216\u8005Permissive\u3002<\/p>\n
\u4f60\u53ef\u4ee5\u4ece\u547d\u4ee4\u884c\u6216\/etc\/selinux\/config\u6587\u4ef6\u66f4\u6539SELinux\u7684\u6a21\u5f0f\u3002\u8981\u4ece\u547d\u4ee4\u884c\u8bbe\u7f6e\u6a21\u5f0f\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528setenforce\u5de5\u5177\u3002\u8981\u8bbe\u7f6eEnforcing\u6a21\u5f0f\uff0c\u6309\u4e0b\u9762\u8fd9\u4e48\u505a\uff1a<\/p>\n
1.\u6253\u5f00\u4e00\u4e2a\u7ec8\u7aef\u7a97\u53e3
\n2.\u6267\u884csu\u7136\u540e\u8f93\u5165\u4f60\u7684\u7ba1\u7406\u5458\u5bc6\u7801
\n3.\u6267\u884csetenforce 1
\n4.\u6267\u884cgetenforce\u786e\u5b9a\u6a21\u5f0f\u5df2\u7ecf\u6b63\u786e\u8bbe\u7f6e\uff08\u5982\u4e0b\u56fe\uff09
\n $\"setenforce_1\"$
\n\u8981\u8bbe\u7f6e\u6a21\u5f0f\u4e3aPermissive\uff0c\u8fd9\u4e48\u505a\uff1a
\n1.\u6253\u5f00\u4e00\u4e2a\u7ec8\u7aef\u7a97\u53e3
\n2.\u6267\u884csu\u7136\u540e\u8f93\u5165\u4f60\u7684\u7ba1\u7406\u5458\u5bc6\u7801
\n3.\u6267\u884csetenforce 0
\n4.\u6267\u884cgetenforce\u786e\u5b9a\u6a21\u5f0f\u5df2\u7ecf\u6b63\u786e\u8bbe\u7f6e\uff08\u5982\u4e0b\u56fe\uff09
\n $\"setenforce$
\n\u6ce8\uff1a\u901a\u8fc7\u547d\u4ee4\u884c\u8bbe\u7f6e\u6a21\u5f0f\u4f1a\u8986\u76d6 SELinux \u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u8bbe\u7f6e\u3002
\n\u5982\u679c\u4f60\u66f4\u613f\u610f\u5728SELinux\u547d\u4ee4\u6587\u4ef6\u4e2d\u8bbe\u7f6e\u6a21\u5f0f\uff0c\u7528\u4f60\u559c\u6b22\u7684\u7f16\u8f91\u5668\u6253\u5f00\u90a3\u4e2a\u6587\u4ef6\u627e\u5230\u8fd9\u4e00\u884c\uff1a<\/p>\n
SELINUX=permissive<\/pre>\n
\u4f60\u53ef\u4ee5\u6309\u4f60\u7684\u504f\u597d\u8bbe\u7f6e\u6a21\u5f0f\uff0c\u7136\u540e\u4fdd\u5b58\u6587\u4ef6\u3002
\n\u8fd8\u6709\u7b2c\u4e09\u79cd\u65b9\u6cd5\u4fee\u6539SELinux\u7684\u6a21\u5f0f\uff08\u901a\u8fc7 bootloader\uff09\uff0c\u4f46\u6211\u4e0d\u63a8\u8350\u65b0\u7528\u6237\u8fd9\u4e48\u505a\u3002<\/p>\n
\u7b56\u7565\u7c7b\u578b<\/strong><\/div>\n
SELinux\u7b56\u7565\u6709\u4e24\u79cd\uff1a
\nTargeted\u76ee\u6807 \u2014 \u53ea\u6709\u76ee\u6807\u7f51\u7edc\u8fdb\u7a0b\uff08dhcpd\uff0chttpd\uff0cnamed\uff0cnscd\uff0cntpd\uff0cportmap\uff0csnmpd\uff0csquid\uff0c\u4ee5\u53ca syslogd\uff09\u53d7\u4fdd\u62a4
\nStrict\u4e25\u683c \u2014 \u5bf9\u6240\u6709\u8fdb\u7a0b\u5b8c\u5168\u7684SELinux\u4fdd\u62a4
\n\u4f60\u53ef\u4ee5\u5728\/etc\/selinux\/config\u6587\u4ef6\u4e2d\u4fee\u6539\u7b56\u7565\u7c7b\u578b\u3002\u7528\u4f60\u559c\u6b22\u7684\u7f16\u8f91\u5668\u6253\u5f00\u8fd9\u4e2a\u6587\u4ef6\u627e\u5230\u8fd9\u4e00\u884c\uff1a<\/p>\n
SELINUXTYPE=targeted<\/pre>\n
\u4fee\u6539\u8fd9\u4e2a\u9009\u9879\u4e3atargeted\u6216strict\u4ee5\u6ee1\u8db3\u4f60\u7684\u9700\u6c42\u3002<\/p>\n
\u68c0\u67e5\u5b8c\u6574\u7684SELinux\u72b6\u6001<\/strong><\/div>\n
\u6709\u4e2a\u65b9\u4fbf\u7684SELinux \u5de5\u5177\uff0c\u4f60\u53ef\u80fd\u60f3\u8981\u7528\u5b83\u6765\u83b7\u53d6\u4f60\u542f\u7528\u4e86SELinux\u7684\u7cfb\u7edf\u7684\u8be6\u7ec6\u72b6\u6001\u62a5\u544a\u3002\u8fd9\u4e2a\u547d\u4ee4\u5728\u7ec8\u7aef\u50cf\u8fd9\u6837\u8fd0\u884c\uff1a<\/p>\n
sestatus -v<\/pre>\n
\u4f60\u53ef\u4ee5\u770b\u5230\u50cf\u4e0b\u56fe\u8fd9\u6837\u7684\u8f93\u51fa\u3002
\n $\"sestatus_v\"$ <\/p>\n
\u4ec5\u662f\u76ae\u6bdb<\/strong><\/div>\n
\u548c\u4f60\u9884\u60f3\u7684\u4e00\u6837\uff0c\u6211\u53ea\u4ecb\u7ecd\u4e86SELinux\u7684\u4e00\u70b9\u76ae\u6bdb\u3002SELinux\u7684\u786e\u662f\u4e2a\u590d\u6742\u7684\u7cfb\u7edf\uff0c\u60f3\u8981\u66f4\u624e\u5b9e\u5730\u7406\u89e3\u5b83\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff0c\u4ee5\u53ca\u4e86\u89e3\u5982\u4f55\u8ba9\u5b83\u66f4\u597d\u5730\u4e3a\u4f60\u7684\u684c\u9762\u6216\u670d\u52a1\u5668\u5de5\u4f5c\u9700\u8981\u66f4\u52a0\u5730\u6df1\u5165\u5b66\u4e60\u3002\u6211\u7684\u5185\u5bb9\u8fd8\u6ca1\u6709\u8986\u76d6\u5230\u7591\u96be\u89e3\u7b54\u548c\u521b\u5efa\u81ea\u5b9a\u4e49SELinux\u7b56\u7565\u3002<\/p>\n
SELinux\u662f\u6240\u6709Linux\u7ba1\u7406\u5458\u90fd\u5e94\u8be5\u77e5\u9053\u7684\u5f3a\u5927\u5de5\u5177\u3002\u73b0\u5728\u5df2\u7ecf\u5411\u4f60\u4ecb\u7ecd\u4e86SELinux\uff0c\u6211\u5f3a\u70c8\u63a8\u8350\u4f60\u56de\u5230Linux.com\uff08\u5f53\u6709\u66f4\u591a\u5173\u4e8e\u6b64\u8bdd\u9898\u7684\u6587\u7ae0\u53d1\u8868\u7684\u65f6\u5019\uff09\u6216\u770b\u770b NSA SELinux<\/a>\u6587\u6863\u83b7\u5f97\u66f4\u52a0\u6df1\u5165\u7684\u6307\u5357\u3002<\/p>\n
\n
\u539f\u6587\u6765\u81ea\uff1a https:\/\/linux.cn\/article-7317-1.html<\/a><\/p>\n
\u672c\u6587\u5730\u5740\uff1a http:\/\/lrxjmw.cn\/selinux-introduction.html<\/a>\u7f16\u8f91\uff1a\u5cb3\u6c38\uff0c\u5ba1\u6838\u5458\uff1a\u9004\u589e\u5b9d<\/span><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
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