{"id":796,"date":"2012-02-13T13:41:45","date_gmt":"2012-02-13T05:41:45","guid":{"rendered":"http:\/\/notes.zerobox.org\/?p=796"},"modified":"2012-02-13T13:41:45","modified_gmt":"2012-02-13T05:41:45","slug":"%e6%b5%85%e8%b0%88ddos%e6%94%bb%e5%87%bb%e6%94%bb%e5%87%bb%e4%b8%8e%e9%98%b2%e5%be%a1","status":"publish","type":"post","link":"http:\/\/zerobox.org\/notes\/796.html","title":{"rendered":"\u6d45\u8c08Ddos\u653b\u51fb\u653b\u51fb\u4e0e\u9632\u5fa1"},"content":{"rendered":"<div>\n<p>EMail: jianxin#80sec.com<br \/>\nSite: http:\/\/www.80sec.com<br \/>\nDate: 2011-2-10<br \/>\nFrom: http:\/\/www.80sec.com\/<\/p>\n<p>[ \u76ee\u5f55 ]<br \/>\n\u4e00 \u80cc\u666f<br \/>\n\u4e8c \u5e94\u6025\u54cd\u5e94<br \/>\n\u4e09 \u5e38\u89c1ddos\u653b\u51fb\u53ca\u9632\u5fa1<br \/>\n\u56db \u6839\u6e90\u53ca\u53cd\u51fb<br \/>\n\u4e94 \u603b\u7ed3<\/p>\n<p>\u4e00 \u80cc\u666f<\/p>\n<p>\u5728\u524d\u51e0\u5929\uff0c\u6211\u4eec\u8fd0\u8425\u7684\u67d0\u7f51\u7ad9\u906d\u53d7\u4e86\u4e00\u6b21ddos\u653b\u51fb\uff0c\u6211\u4eec\u7684\u7f51\u7ad9\u662f\u4e00\u4e2a\u516c\u76ca\u6027\u8d28\u7684\u7f51\u7ad9\uff0c\u4e3a\u5404\u4e2a\u5382\u5546\u548c\u767d\u5e3d\u5b50\u4e4b\u95f4\u642d\u5efa\u4e00\u4e2a\u5e73\u53f0\u4ee5\u4f20\u9012\u5b89\u5168\u95ee\u9898\u7b49\u4fe1\u606f\uff0c\u6211\u4eec\u5e76\u4e0d\u6e05\u695a\u56e0\u4e3a\u4ec0\u4e48\u539f\u56e0\u4f1a\u906d\u9047\u8fd9\u79cd\u65e0\u803b\u7684\u653b\u51fb\u3002\u56e0\u4e3a\u6211\u4eec\u672c\u8eab\u5e76\u4e0d\u4ece\u4e8b\u8fd9\u79cd\u7c7b\u578b\u7684\u653b\u51fb\uff0c\u8fd9\u79cd\u653b\u51fb\u6280\u672f\u4e00\u822c\u4e5f\u662f\u6bd4\u8f83\u7c97\u7cd9\u7684\uff0c\u6240\u4ee5\u8ba8\u8bba\u5f97\u6bd4\u8f83\u5c11\uff0c\u4f46\u662f\u65e2\u7136\u53d1\u751f\u4e86\u8fd9\u6837\u7684\u653b\u51fb\u6211\u4eec\u89c9\u5f97\u5206\u4eab\u653b\u51fb\u53d1\u751f\u540e\u6211\u4eec\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u5b66\u5230\u5f97\u4e1c\u897f\uff0c\u4ee5\u53ca\u9488\u5bf9\u8fd9\u79cd\u653b\u51fb\u6211\u4eec\u7684\u60f3\u6cd5\u624d\u80fd\u8ba9\u8fd9\u6b21\u653b\u51fb\u4ea7\u751f\u771f\u6b63\u7684\u4ef7\u503c\uff0c\u800c\u5e76\u4e0d\u662f\u8fd9\u6837\u7684\u653b\u51fb\u4ec5\u4ec5\u6d6a\u8d39\u5927\u5bb6\u7684\u65f6\u95f4\u800c\u5df2\u3002<br \/>\n\u53e6\u5916\uff0c\u6211\u4eec\u53d1\u73b0\u5927\u578b\u7684\u4f01\u4e1a\u90fd\u6709\u906d\u53d7\u653b\u51fb\u7684\u6848\u4f8b\uff0c\u4f46\u662f\u5927\u5bb6\u906d\u53d7\u653b\u51fb\u4e4b\u540e\u7684\u5e94\u5bf9\u63aa\u65bd\u53ca\u5b66\u5230\u7684\u7ecf\u9a8c\u5374\u5206\u4eab\u90fd\u6bd4\u8f83\u5c11\uff0c\u8fd9\u5bfc\u81f4\u5404\u5bb6\u90fd\u662f\u81ea\u884c\u7684\u6478\u7d22\u7ecf\u9a8c\uff0c\u4f9d\u7136\u505c\u7559\u5728\u4e00\u5bb6\u4f01\u4e1a\u5bf9\u6297\u6574\u4e2a\u4e92\u8054\u7f51\u7684\u653b\u51fb\u7684\u5c40\u9762\uff0c\u800c\u5bf9\u4e8e\u653b\u51fb\u8005\u5374\u662f\u6b64\u6b21\u653b\u51fb\u9488\u5bf9\u4f60\uff0c\u4e0b\u6b21\u653b\u51fb\u5374\u662f\u9488\u5bf9\u4ed6\u4e86\uff0c\u800c\u4e14\u653b\u51fb\u4e4b\u540e\u65e0\u8bba\u662f\u6280\u672f\u8fd8\u662f\u8d44\u6e90\u90fd\u6ca1\u6709\u4efb\u4f55\u7684\u635f\u8017\uff0c\u8fd9\u4e5f\u662f\u5bfc\u81f4\u8fd9\u79cd\u653b\u51fb\u9891\u7e41\u5e76\u4e14\u8086\u65e0\u5fcc\u60ee\u7684\u539f\u56e0\u3002<br \/>\n\u6211\u4eec\u6765\u5c1d\u8bd5\u505a\u4e00\u4e9b\u6539\u53d8\uff1a\uff09<br \/>\n\u4e8c \u5e94\u6025\u54cd\u5e94<\/p>\n<p>\u5728\u653b\u51fb\u53d1\u751f\u540e\uff0c\u7b2c\u4e00\u4e2a\u73b0\u8c61\u662f\u6211\u4eec\u7684\u7f51\u7ad9\u4e0a\u4e0d\u53bb\u4e86\uff0c\u4f46\u662f\u4f9d\u7136\u53ef\u4ee5\u8bbf\u95ee\u5230\u7ba1\u7406\u754c\u9762\uff0c\u6211\u4eec\u767b\u9646\u4e0a\u53bb\u7b80\u5355\u6267\u884c\u4e86\u547d\u4ee4\uff1a<\/p>\n<p>netstat -antp<\/p>\n<p>\u6211\u4eec\u770b\u5230\u6709\u5927\u91cf\u7684\u94fe\u63a5\u5b58\u5728\u7740\uff0c\u5e76\u4e14\u90fd\u662fESTABLISHED\u72b6\u6001\uff0c\u6b63\u5e38\u72b6\u6001\u4e0b\u6211\u4eec\u7684\u7f51\u7ad9\u8bbf\u95ee\u91cf\u6ca1\u6709\u8fd9\u4e48\u9ad8\uff0c\u5982\u679c\u6709\u8fd9\u4e48\u9ad8\u6211\u4eec\u76f8\u4fe1\u4e2d\u56fd\u7684\u4fe1\u606f\u5b89\u5168\u5c31\u6709\u5e0c\u671b\u4e86\uff0c\u5bf9\u4e8e\u8fd9\u6837\u7684\u60c5\u51b5\u5176\u5b9e\u5904\u7406\u5c31\u6bd4\u8f83\u7b80\u5355\uff0c\u8fd9\u662f\u4e00\u6b21\u56db\u5c42\u7684\u653b\u51fb\uff0c\u4e5f\u5c31\u662f\u6240\u6709ip\u90fd\u662f\u771f\u5b9e\u7684\uff0c\u7531\u4e8e\u76ee\u524d\u4e3a\u6b62\u53ea\u662f\u6d88\u8017\u4e86webserver\u7684\u7f51\u7edc\u8fde\u63a5\u8d44\u6e90\uff0c\u6240\u4ee5\u6211\u4eec\u53ea\u9700\u8981\u7b80\u5355\u7684\u5c06\u8fd9\u4e9bip\u5728\u7f51\u7edc\u5c42\u5c01\u7981\u5c31\u53ef\u4ee5\uff0c\u5f88\u7b80\u5355\uff0c\u7528\u4e0b\u9762\u7684\u547d\u4ee4\u5373\u53ef\uff1a<\/p>\n<p>for i in `netstat -an | grep -i \u2018:80 \u2018|grep \u2018EST\u2019 | awk \u2018{print $5}\u2019 | cut -d : -f 1 | sort | uniq -c | awk \u2018{if($1 &gt; 50) {print $2}}\u2019`<br \/>\necho $i<br \/>\necho $i &gt;&gt; \/tmp\/banip<br \/>\n\/sbin\/iptables -A INPUT -p tcp -j DROP -s $i<br \/>\ndone<\/p>\n<p>\u7136\u540e\u4f5c\u4e3a\u8ba1\u5212\u4efb\u52a1\u4e00\u5206\u949f\u6267\u884c\u4e00\u6b21\u5373\u53ef\uff0c\u5f88\u5feb\uff0ciptables\u7684\u5c01\u7981\u5217\u8868\u5c31\u5145\u65a5\u4e86\u5927\u91cf\u7684\u5c01\u7981ip\uff0c\u6211\u4eec\u7b80\u5355\u7684\u7edf\u8ba1\u4e86\u4e0b\u8fde\u63a5\u6570\u6700\u5927\u7684\u4e00\u4e9bip\u53d1\u73b0\u90fd\u6765\u81ea\u97e9\u56fd\u3002\u4e3a\u4e86\u4fdd\u8bc1\u7cfb\u7edf\u7684\u6027\u80fd\uff0c\u6211\u4eec\u8c03\u5927\u4e86\u7cfb\u7edf\u7684\u53ef\u63a5\u53d7\u7684\u8fde\u63a5\u6570\u4ee5\u53ca\u5bf9Nginx\u8fdb\u884c\u4e86\u6bcf\u4e2a\u8fde\u63a5\u80fd\u591f\u8fdb\u884c\u7684\u8bf7\u6c42\u901f\u7387\uff0c\u7cfb\u7edf\u4e8e\u662f\u6062\u590d\u4e86\u6b63\u5e38\u7684\u8fd0\u884c\u3002<br \/>\n\u6b63\u5e38\u72b6\u6001\u4e00\u76f4\u6301\u7eed\u5230\u7b2c\u4e8c\u5929\uff0c\u4f46\u662f\u5230\u4e2d\u5348\u4e4b\u540e\u6211\u4eec\u53d1\u73b0\u8bbf\u95ee\u53c8\u51fa\u73b0\u4e86\u95ee\u9898\uff0c\u7f51\u7edc\u5f88\u6162\uff0c\u4f7f\u7528ping\u53d1\u73b0\u5927\u6982\u51fa\u73b0\u4e8670%\u5de6\u53f3\u7684\u4e22\u5305\uff0c\u5728\u8270\u96be\u7684\u767b\u9646\u5230\u7cfb\u7edf\u4e0a\u4e4b\u540e\uff0c\u53d1\u73b0\u7cfb\u7edf\u5df2\u7ecf\u5f88\u5c11\u6709TCP\u7684\u6b63\u5e38\u8fde\u63a5\uff0c\u4e3a\u4e86\u67e5\u660e\u539f\u56e0\uff0c\u6211\u4eec\u5bf9\u7cfb\u7edf\u8fdb\u884c\u4e86\u6293\u5305\uff1a<\/p>\n<p>tcpdump -w tmp.pcap port not 22<br \/>\ntcpdump -r tmp.pcap -nnA<\/p>\n<p>\u6211\u4eec\u53d1\u73b0\u653b\u51fb\u5df2\u7ecf\u4ece\u5e94\u7528\u5c42\u7684\u653b\u51fb\u8c03\u6574\u5230\u4e86\u7f51\u7edc\u5c42\u7684\u653b\u51fb\uff0c\u5927\u91cf\u7684\u76ee\u6807\u7aef\u53e3\u662f80\u7684udp\u548cicmp\u5305\u4ee5\u6781\u5feb\u7684\u901f\u5ea6\u5145\u6ee1\u4e86\u7f51\u7edc\uff0c\u4e00\u4e2a\u5305\u5927\u5c0f\u5927\u6982\u57281k\u5de6\u53f3\uff0c\u8fd9\u6b21\u5360\u636e\u7684\u8d44\u6e90\u7eaf\u7cb9\u662f\u5e26\u5bbd\u8d44\u6e90\u4e86\uff0c\u5373\u4f7f\u5728\u7cfb\u7edf\u4e0a\u505a\u9650\u5236\u4e5f\u89e3\u51b3\u4e0d\u4e86\u8fd9\u4e2a\u95ee\u9898\uff0c\u4e0d\u8fc7\u4e5f\u6ca1\u6709\u5173\u7cfb\uff0c\u5bf9\u4e8e\u7f51\u7edc\u5c42\u7684\u95ee\u9898\u6211\u4eec\u53ef\u4ee5\u5728\u7f51\u7edc\u5c42\u4e0a\u505a\u9650\u5236\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728\u7f51\u7edc\u4e0a\u628a\u5230\u8fbe\u6211\u4eecip\u7684\u975eTCP\u7684\u6240\u6709\u5305\u5982UDP\u548cICMP\u7b49\u534f\u8bae\u90fd\u7981\u6b62\u6389\u5373\u53ef\uff0c\u4f46\u662f\u6211\u4eec\u6ca1\u6709\u81ea\u5df1\u7684\u670d\u52a1\u5668\u4e5f\u7f3a\u4e4f\u5bf9\u7f51\u7edc\u8bbe\u5907\u7684\u63a7\u5236\u6743\uff0c\u76ee\u524d\u662f\u7531\u5de5\u4fe1\u90e8CERT\u63d0\u4f9b\u652f\u6301\u7684\uff0c\u7531\u4e8e\u4e34\u65f6\u65e0\u6cd5\u534f\u8c03\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\uff0c\u540e\u679c\u5982\u5927\u5bb6\u770b\u5230\uff0c\u6211\u4eec\u7684\u670d\u52a1\u5f88\u6162\uff0c\u57fa\u672c\u4e0a\u505c\u6b62\u4e86\u670d\u52a1\uff0c\u5728\u4e00\u6bb5\u65f6\u95f4\u4e4b\u540e\u653b\u51fb\u8005\u505c\u6b62\u4e86\u653b\u51fb\uff0c\u670d\u52a1\u624d\u8fdb\u884c\u4e86\u6062\u590d\uff0c\u5f88\u618b\u5c48\u662f\u4e48\uff1f\u4f46\u662f\u540c\u65f6\u6211\u4eec\u5f97\u5230\u4e86\u5f88\u591a\u70ed\u5fc3\u670b\u53cb\u7684\u5e2e\u52a9\uff0c\u5f97\u5230\u4e86\u66f4\u597d\u7684\u7f51\u7edc\u548c\u670d\u52a1\u5668\u8d44\u6e90\uff0c\u5728\u7f51\u7edc\u8d44\u6e90\u65b9\u9762\u7684\u80fd\u529b\u5f97\u5230\u4e86\u5f88\u5927\u7684\u63d0\u5347\uff0c\u7f13\u89e3\u4e86\u8fd9\u65b9\u9762\u7684\u95ee\u9898\uff0c\u8fd9\u91cc\u5bf9\u4ed6\u4eec\u8868\u793a\u611f\u8c22\u3002<\/p>\n<p>\u4e09 \u5e38\u89c1ddos\u653b\u51fb\u53ca\u9632\u5fa1<\/p>\n<p>\u7ee7\u7eed\u79c9\u627f80sec\u7684\u201dKnow it then hack it\u201d\uff0c\u8fd9\u91cc\u7b80\u5355\u8c08\u4e00\u4e0bddos\u653b\u51fb\u548c\u9632\u5fa1\u65b9\u9762\u7684\u95ee\u9898\u3002ddos\u7684\u5168\u79f0\u662f\u5206\u5e03\u5f0f\u62d2\u7edd\u670d\u52a1\u653b\u51fb\uff0c\u65e2\u7136\u662f\u62d2\u7edd\u670d\u52a1\u4e00\u5b9a\u662f\u56e0\u4e3a\u67d0\u4e9b\u539f\u56e0\u800c\u505c\u6b62\u670d\u52a1\u7684\uff0c\u5176\u4e2d\u6700\u91cd\u8981\u7684\u4e5f\u662f\u6700\u5e38\u7528\u7684\u539f\u56e0\u5c31\u662f\u5229\u7528\u670d\u52a1\u7aef\u65b9\u9762\u8d44\u6e90\u7684\u6709\u9650\u6027\uff0c\u8fd9\u79cd\u670d\u52a1\u7aef\u7684\u8d44\u6e90\u8303\u56f4\u5f88\u5e7f\uff0c\u53ef\u4ee5\u7b80\u5355\u7684\u68b3\u7406\u4e00\u4e2a\u8bf7\u6c42\u6b63\u5e38\u5b8c\u6210\u7684\u8fc7\u7a0b\uff1a<\/p>\n<p>1 \u7528\u6237\u5728\u5ba2\u6237\u7aef\u6d4f\u89c8\u5668\u8f93\u5165\u8bf7\u6c42\u7684\u5730\u5740<br \/>\n2 \u6d4f\u89c8\u5668\u89e3\u6790\u8be5\u8bf7\u6c42\uff0c\u5305\u62ec\u5206\u6790\u5176\u4e2d\u7684dns\u4ee5\u660e\u786e\u9700\u8981\u5230\u8fbe\u7684\u8fdc\u7a0b\u670d\u52a1\u5668\u5730\u5740<br \/>\n3 \u660e\u786e\u5730\u5740\u540e\u6d4f\u89c8\u5668\u548c\u670d\u52a1\u5668\u7684\u670d\u52a1\u5c1d\u8bd5\u5efa\u7acb\u8fde\u63a5\uff0c\u5c1d\u8bd5\u5efa\u7acb\u8fde\u63a5\u7684\u6570\u636e\u5305\u901a\u8fc7\u672c\u5730\u7f51\u7edc\uff0c\u4e2d\u95f4\u8def\u7531\u6700\u7ec8\u8270\u82e6\u5230\u8fbe\u76ee\u6807\u7f51\u7edc\u518d\u5230\u8fbe\u76ee\u6807\u670d\u52a1\u5668<br \/>\n4 \u7f51\u7edc\u8fde\u63a5\u5efa\u7acb\u5b8c\u6210\u4e4b\u540e\u6d4f\u89c8\u5668\u6839\u636e\u8bf7\u6c42\u5efa\u7acb\u4e0d\u540c\u7684\u6570\u636e\u5305\u5e76\u4e14\u5c06\u6570\u636e\u5305\u53d1\u9001\u5230\u670d\u52a1\u5668\u67d0\u4e2a\u7aef\u53e3<br \/>\n5 \u7aef\u53e3\u6620\u5c04\u5230\u8fdb\u7a0b\uff0c\u8fdb\u7a0b\u63a5\u53d7\u5230\u6570\u636e\u5305\u4e4b\u540e\u8fdb\u884c\u5185\u90e8\u7684\u89e3\u6790<br \/>\n6 \u8bf7\u6c42\u670d\u52a1\u5668\u5185\u90e8\u7684\u5404\u79cd\u4e0d\u540c\u7684\u8d44\u6e90\uff0c\u5305\u62ec\u540e\u7aef\u7684API\u4ee5\u53ca\u4e00\u4e9b\u6570\u636e\u5e93\u6216\u8005\u6587\u4ef6\u7b49<br \/>\n7 \u5728\u903b\u8f91\u5904\u7406\u5b8c\u6210\u4e4b\u540e\u6570\u636e\u5305\u6309\u7167\u4e4b\u524d\u5efa\u7acb\u7684\u901a\u9053\u8fd4\u56de\u5230\u7528\u6237\u6d4f\u89c8\u5668\uff0c\u6d4f\u89c8\u5668\u5b8c\u6210\u89e3\u6790\uff0c\u8bf7\u6c42\u5b8c\u6210\u3002<\/p>\n<p>\u4e0a\u9762\u5404\u4e2a\u70b9\u90fd\u53ef\u4ee5\u88ab\u7528\u6765\u8fdb\u884cddos\u653b\u51fb\uff0c\u5305\u62ec\uff1a<\/p>\n<p>1 \u67d0\u4e9b\u8457\u540d\u7684\u5ba2\u6237\u7aef\u52ab\u6301\u75c5\u6bd2\uff0c\u8fd8\u8bb0\u5f97\u8bbf\u95ee\u767e\u5ea6\u8df3\u641c\u72d7\u7684\u4e8b\u60c5\u4e48\uff1f\uff1a\uff09<br \/>\n2 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