{"id":124259,"date":"2022-07-18T08:21:20","date_gmt":"2022-07-18T00:21:20","guid":{"rendered":"http:\/\/www.idc.net\/help\/124259\/"},"modified":"2022-07-18T08:21:20","modified_gmt":"2022-07-18T00:21:20","slug":"%e9%ab%98%e6%95%88%e6%b8%85%e9%99%a4%e6%b5%81%e9%87%8f%e5%9e%83%e5%9c%be-linux%e6%b5%81%e9%87%8f%e6%b8%85%e6%b4%97%e6%8a%80%e5%b7%a7-linux-%e6%b5%81%e9%87%8f%e6%b8%85%e6%b4%97","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/124259\/","title":{"rendered":"\u9ad8\u6548\u6e05\u9664\u6d41\u91cf\u5783\u573e\u2014\u2014Linux\u6d41\u91cf\u6e05\u6d17\u6280\u5de7 (linux 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\u2014\u2014DDoS\u653b\u51fb\u539f\u7406<\/p>\n<p>1. DDoS\u653b\u51fb\u57fa\u7840<\/p>\n<p>DDoS\uff08Distributed Denial of service\uff0c\u5206\u5e03\u5f0f\u62d2\u7edd\u670d\u52a1\uff09\u653b\u51fb\u7684\u4e3b\u8981\u76ee\u7684\u662f\u8ba9\u6307\u5b9a\u76ee\u6807\u65e0\u6cd5\u63d0\u4f9b\u6b63\u5e38\u670d\u52a1\uff0c\u751a\u81f3\u4ece\u4e92\u8054\u7f51\u4e0a\u6d88\u5931\uff0c\u662f\u76ee\u524d\u6700\u5f3a\u5927\u3001\u6700\u96be\u9632\u5fa1\u7684\u653b\u51fb\u4e4b\u4e00\u3002<\/p>\n<p>\u6309\u7167\u53d1\u8d77\u7684\u65b9\u5f0f\uff0cDDoS\u53ef\u4ee5\u7b80\u5355\u5206\u4e3a\u4e09\u7c7b\uff1a\u4e4b\u4e00\u7c7b\u4ee5\u529b\u53d6\u80dc\uff0c\u6d77\u91cf\u6570\u636e\u5305\u4ece\u4e92\u8054\u7f51\u7684\u5404\u4e2a\u89d2\u843d\u8702\u62e5\u800c\u6765\uff0c\u5835\u585eIDC\u5165\u53e3\uff0c\u8ba9\u5404\u79cd\u5f3a\u5927\u7684\u786c\u4ef6\u9632\u5fa1\u7cfb\u7edf\u3001\u5feb\u901f\u9ad8\u6548\u7684\u5e94\u6025\u6d41\u7a0b\u800c\u65e0\u7528\u6b66\u4e4b\u5730\uff0c\u8fd9\u79cd\u7c7b\u578b\u7684\u653b\u51fb\u5178\u578b\u4ee3\u8868\u662fICMP Flood\u548cUDP Flood\uff0c\u73b0\u5728\u5df2\u4e0d\u5e38\u89c1\uff1b\u7b2c\u4e8c\u7c7b\u4ee5\u5de7\u53d6\u80dc\uff0c\u7075\u52a8\u96be\u4ee5\u5bdf\u89c9\uff0c\u6bcf\u9694\u51e0\u5206\u949f\u53d1\u4e00\u4e2a\u5305\u751a\u81f3\u53ea\u9700\u8981\u4e00\u4e2a\u5305\uff0c\u5c31\u53ef\u4ee5\u8ba9\u8c6a\u534e\u914d\u7f6e\u7684\u670d\u52a1\u5668\u4e0d\u518d\u54cd\u5e94\u3002\u8fd9\u7c7b\u653b\u51fb\u4e3b\u8981\u662f\u5229\u7528\u534f\u8bae\u6216\u8005\u8f6f\u4ef6\u7684\u6f0f\u6d1e\u53d1\u8d77\uff0c\u5982Slowloris\u653b\u51fb\uff0cHash\u51b2\u7a81\u653b\u51fb\u7b49\uff0c\u9700\u8981\u7279\u5b9a\u73af\u5883\u673a\u7f18\u5de7\u5408\u4e0b\u624d\u80fd\u51fa\u73b0\uff1b\u7b2c\u4e09\u7c7b\u662f\u4e0a\u8ff0\u4e24\u79cd\u7684\u6df7\u5408\uff0c\u8f7b\u7075\u6d51\u539a\u517c\u800c\u6709\u4e4b\uff0c\u65e2\u5229\u7528\u4e86\u534f\u8bae\u3001\u7cfb\u7edf\u7684\u7f3a\u9677\uff0c\u53c8\u5177\u5907\u4e86\u6d77\u91cf\u7684\u6d41\u91cf\uff0c\u5982SYN Flood\u653b\u51fb\uff0cDNS Query Flood\u653b\u51fb\uff0c\u662f\u5f53\u524d\u7684\u4e3b\u6d41\u653b\u51fb\u65b9\u5f0f\u3002<\/p>\n<p>\u4e0b\u6587\u5c06\u4e00\u4e00\u63cf\u8ff0\u8fd9\u4e9b\u6700\u5e38\u89c1\u3001\u66f4\u5177\u4ee3\u8868\u6027\u653b\u51fb\u65b9\u5f0f\uff0c\u5e76\u4ecb\u7ecd\u4ed6\u4eec\u7684\u9632\u5fa1\u65b9\u6848\u3002<\/p>\n<p>1.1 SYN Flood<\/p>\n<p>SYN Flood\u662f\u4e92\u8054\u7f51\u4e0a\u6700\u7ecf\u5178\u7684DDoS\u653b\u51fb\u65b9\u5f0f\u4e4b\u4e00\uff0c\u6700\u65e9\u51fa\u73b0\u4e8e1999\u5e74\u5de6\u53f3\uff0c\u96c5\u864e\u662f\u5f53\u65f6\u6700\u8457\u540d\u7684\u53d7\u5bb3\u8005\u3002SYN Flood\u653b\u51fb\u5229\u7528\u4e86TCP\u4e09\u6b21\u63e1\u624b\u7684\u7f3a\u9677\uff0c\u80fd\u591f\u4ee5\u8f83\u5c0f\u4ee3\u4ef7\u4f7f\u76ee\u6807\u670d\u52a1\u5668\u65e0\u6cd5\u54cd\u5e94\uff0c\u4e14\u96be\u4ee5\u8ffd\u67e5\u3002<\/p>\n<p>\u6807\u51c6\u641c\u54ea\u7684TCP\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<p>\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2a\u5305\u542bSYN\u6807\u5fd7\u7684TCP\u62a5\u6587\uff0cSYN\u5373\u540c\u6b65\uff08Synchronize\uff09\uff0c\u540c\u6b65\u62a5\u6587\u4f1a\u6307\u660e\u5ba2\u6237\u7aef\u4f7f\u7528\u7684\u7aef\u53e3\u4ee5\u53caTCP\u8fde\u63a5\u7684\u521d\u59cb\u5e8f\u53f7;<\/p>\n<p>\u670d\u52a1\u5668\u5728\u6536\u5230\u5ba2\u6237\u7aef\u7684SYN\u62a5\u6587\u540e\uff0c\u5c06\u8fd4\u56de\u4e00\u4e2aSYN ACK\uff08\u5373\u786e\u8ba4Acknowledgement\uff09\u7684\u62a5\u6587\uff0c\u8868\u793a\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u88ab\u63a5\u53d7\uff0c\u540c\u65f6TCP\u521d\u59cb\u5e8f\u53f7\u81ea\u52a8\u52a0\u4e00\u3002<\/p>\n<p>\u5ba2\u6237\u7aef\u4e5f\u8fd4\u56de\u4e00\u4e2a\u786e\u8ba4\u62a5\u6587ACK\u7ed9\u670d\u52a1\u5668\u7aef\uff0c\u540c\u6837TCP\u5e8f\u5217\u53f7\u88ab\u52a0\u4e00\u3002<\/p>\n<p>\u7ecf\u8fc7\u8fd9\u4e09\u6b65\uff0cTCP\u8fde\u63a5\u5c31\u5efa\u7acb\u5b8c\u6210\u3002TCP\u534f\u8bae\u4e3a\u4e86\u5b9e\u73b0\u53ef\u9760\u4f20\u8f93\uff0c\u5728\u4e09\u6b21\u63e1\u624b\u7684\u8fc7\u7a0b\u4e2d\u8bbe\u7f6e\u4e86\u4e00\u4e9b\u5f02\u5e38\u5904\u7406\u673a\u5236\u3002\u7b2c\u4e09\u6b65\u4e2d\u5982\u679c\u670d\u52a1\u5668\u6ca1\u6536\u5230\u5ba2\u6237\u7aef\u7684\u6700\u7ec8ACK\u786e\u8ba4\u62a5\u6587\uff0c\u4f1a\u4e00\u76f4\u5904\u4e8eSYN_RECV\u72b6\u6001\uff0c\u5c06\u5ba2\u6237\u7aefIP\u52a0\u5165\u7b49\u5f85\u5217\u8868\uff0c\u5e76\u91cd\u53d1\u7b2c\u4e8c\u6b65\u7684SYN ACK\u62a5\u6587\u3002\u91cd\u53d1\u4e00\u822c\u8fdb\u884c3-5\u6b21\uff0c\u5927\u7ea6\u95f4\u969430\u79d2\u5de6\u53f3\u8f6e\u8be2\u4e00\u6b21\u7b49\u5f85\u5217\u8868\u91cd\u8bd5\u6240\u6709\u5ba2\u6237\u7aef\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u670d\u52a1\u5668\u5728\u81ea\u5df1\u53d1\u51fa\u4e86SYN ACK\u62a5\u6587\u540e\uff0c\u4f1a\u9884\u5206\u914d\u8d44\u6e90\u4e3a\u5373\u5c06\u5efa\u7acb\u7684TCP\u8fde\u63a5\u50a8\u5b58\u4fe1\u606f\u505a\u51c6\u5907\uff0c\u8fd9\u4e2a\u8d44\u6e90\u5728\u7b49\u5f85\u91cd\u8bd5\u671f\u95f4\u4e00\u76f4\u4fdd\u7559\u3002\u66f4\u4e3a\u91cd\u8981\u7684\u662f\uff0c\u670d\u52a1\u5668\u8d44\u6e90\u6709\u9650\uff0c\u53ef\u4ee5\u7ef4\u62a4\u7684SYN_RECV\u72b6\u6001\u8d85\u8fc7\u6781\u9650\u540e\u5c31\u4e0d\u518d\u63a5\u53d7\u65b0\u7684SYN\u62a5\u6587\uff0c\u4e5f\u5c31\u662f\u62d2\u7edd\u65b0\u7684TCP\u8fde\u63a5\u5efa\u7acb\u3002<\/p>\n<p>SYN Flood\u6b63\u662f\u5229\u7528\u4e86\u4e0a\u6587\u4e2dTCP\u534f\u8bae\u7684\u8bbe\u5b9a\uff0c\u8fbe\u5230\u653b\u51fb\u7684\u76ee\u7684\u3002\u653b\u51fb\u8005\u4f2a\u88c5\u5927\u91cf\u7684IP\u5730\u5740\u7ed9\u670d\u52a1\u5668\u53d1\u9001SYN\u62a5\u6587\uff0c\u7531\u4e8e\u4f2a\u9020\u7684IP\u5730\u5740\u51e0\u4e4e\u4e0d\u53ef\u80fd\u5b58\u5728\uff0c\u4e5f\u5c31\u51e0\u4e4e\u6ca1\u6709\u8bbe\u5907\u4f1a\u7ed9\u670d\u52a1\u5668\u8fd4\u56de\u4efb\u4f55\u5e94\u7b54\u4e86\u3002\u6001\u96f9\u56e0\u6b64\uff0c\u670d\u52a1\u5668\u5c06\u4f1a\u7ef4\u6301\u4e00\u4e2a\u5e9e\u5927\u7684\u7b49\u5f85\u5217\u8868\uff0c\u4e0d\u505c\u7684\u91cd\u8bd5\u53d1\u9001SYN ACK\u62a5\u6587\uff0c\u540c\u65f6\u5360\u7528\u7740\u5927\u91cf\u7684\u8d44\u6e90\u65e0\u6cd5\u91ca\u653e\u3002\u66f4\u5173\u952e\u7684\u662f\uff0c\u88ab\u653b\u51fb\u670d\u52a1\u5668\u7684SYN_RECV\u961f\u5217\u88ab\u6076\u610f\u7684\u6570\u636e\u5305\u5360\u6ee1\uff0c\u4e0d\u518d\u63a5\u53d7\u65b0\u7684SYN\u8bf7\u6c42\uff0c\u5408\u6cd5\u7528\u6237\u65e0\u6cd5\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8d77TCP\u8fde\u63a5\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u8fd9\u4e2a\u670d\u52a1\u5668\u88abSYN Flood\u62d2\u7edd\u670d\u52a1\u4e86\u3002<\/p>\n<p>\u5bf9SYN Flood\u6709\u5174\u8da3\u7684\u53ef\u4ee5\u770b\u770b\u8fd9\u91cc\uff0c\u8fd9\u662f\u7b14\u80052023\u5e74\u5199\u7684\u4ee3\u7801\uff0c\u540e\u6765\u505a\u8fc7\u51e0\u6b21\u4fee\u6539\uff0c\u4fee\u6539bug\uff0c\u5e76\u964d\u4f4e\u4e86\u653b\u51fb\u6027\uff0c\u7eaf\u505a\u5e06\u6f0f\u5e06\u6d4b\u8bd5\u4f7f\u7528\u3002<\/p>\n<p>1.2 DNS Query Flood<\/p>\n<p>\u4f5c\u4e3a\u4e92\u8054\u7f51\u6700\u57fa\u7840\u6700\u6838\u5fc3\u7684\u670d\u52a1\uff0cDNS\u81ea\u7136\u4e5f\u662fDDoS\u653b\u51fb\u7684\u91cd\u8981\u76ee\u6807\u4e4b\u4e00\u3002\u6253\u57aeDNS\u670d\u52a1\u80fd\u591f\u95f4\u63a5\u7684\u6253\u57ae\u4e86\u4e00\u4e2a\u516c\u53f8\u7684\u5168\u90e8\u4e1a\u52a1\uff0c\u6216\u8005\u6253\u57ae\u4e00\u4e2a\u5730\u533a\u7684\u7f51\u7edc\u670d\u52a1\u3002\u524d\u4e9b\u65f6\u5019\u98ce\u5934\u6b63\u76db\u7684\u9ed1\u5ba2\u7ec4\u7ec7anonymous\u4e5f\u66fe\u7ecf\u5ba3\u5e03\u8981\u653b\u51fb\u5168\u7403\u4e92\u8054\u7f51\u768413\u53f0\u6839DNS\u670d\u52a1\u5668\uff0c\u4e0d\u8fc7\u6700\u7ec8\u6ca1\u6709\u5f97\u624b\u3002<\/p>\n<p>UDP\u653b\u51fb\u662f\u6700\u5bb9\u6613\u53d1\u8d77\u6d77\u91cf\u6d41\u91cf\u7684\u653b\u51fb\u624b\u6bb5\uff0c\u800c\u4e14\u6e90IP\u968f\u673a\u4f2a\u9020\u96be\u4ee5\u8ffd\u67e5\u3002\u4f46\u662f\u8fc7\u6ee4\u6bd4\u8f83\u5bb9\u6613\uff0c\u56e0\u4e3a\u5927\u591a\u6570IP\u5e76\u4e0d\u63d0\u4f9bUDP\u670d\u52a1\uff0c\u76f4\u63a5\u4e22\u5f03UDP\u6d41\u91cf\u5373\u53ef\u3002\u6240\u4ee5\u73b0\u5728\u7eaf\u7cb9\u7684UDP\u6d41\u91cf\u653b\u51fb\u6bd4\u8f83\u5c11\u89c1\u4e86\uff0c\u53d6\u800c\u4ee3\u4e4b\u7684\u662fUDP\u534f\u8bae\u627f\u8f7d\u7684DNS Query Flood\u653b\u51fb\u3002\u7b80\u5355\u5730\u8bf4\uff0c\u8d8a\u4e0a\u5c42\u534f\u8bae\u4e0a\u53d1\u52a8\u7684DDoS\u653b\u51fb\u8d8a\u96be\u4ee5\u9632\u5fa1\uff0c\u56e0\u4e3a\u534f\u8bae\u8d8a\u4e0a\u5c42\uff0c\u4e0e\u4e1a\u52a1\u5173\u8054\u8d8a\u5927\uff0c\u9632\u5fa1\u7cfb\u7edf\u9762\u4e34\u7684\u60c5\u51b5\u8d8a\u590d\u6742\u3002<\/p>\n<p>DNS Query Flood\u5c31\u662f\u653b\u51fb\u8005\u64cd\u7eb5\u5927\u91cf\u5080\u5121\u673a\u5668\uff0c\u5bf9\u76ee\u6807\u53d1\u8d77\u6d77\u91cf\u7684\u57df\u540d\u67e5\u8be2\u8bf7\u6c42\u3002\u4e3a\u4e86\u9632\u6b62\u57fa\u4e8eACL\u7684\u8fc7\u6ee4\uff0c\u5fc5\u987b\u63d0\u9ad8\u6570\u636e\u5305\u7684\u968f\u673a\u6027\u3002\u5e38\u7528\u7684\u505a\u6cd5\u662fUDP\u5c42\u968f\u673a\u4f2a\u9020\u6e90IP\u5730\u5740\uff0c\u968f\u673a\u4f2a\u9020\u6e90\u7aef\u53e3\u7b49\u53c2\u6570\u3002\u5728DNS\u534f\u8bae\u5c42\uff0c\u968f\u673a\u4f2a\u9020\u67e5\u8be2ID\u4ee5\u53ca\u5f85\u89e3\u6790\u57df\u540d\u3002\u968f\u673a\u4f2a\u9020\u5f85\u89e3\u6790\u57df\u540d\u9664\u4e86\u9632\u6b62\u8fc7\u6ee4\u5916\uff0c\u8fd8\u53ef\u4ee5\u964d\u4f4e\u547d\u4e2dDNS\u7f13\u5b58\u7684\u53ef\u80fd\u6027\uff0c\u5c3d\u53ef\u80fd\u591a\u7684\u6d88\u8017DNS\u670d\u52a1\u5668\u7684CPU\u8d44\u6e90\u3002<\/p>\n<p>\u5173\u4e8eDNS Query<\/p>\n<p>Flood\u7684\u4ee3\u7801\uff0c\u7b14\u80052023\u5e747\u6708\u4efd\u4e3a\u4e86\u6d4b\u8bd5\u670d\u52a1\u5668\u6027\u80fd\u66fe\u7ecf\u5199\u8fc7\u4e00\u4efd\u4ee3\u7801\uff0c\u89c1\u8fd9\u91cc\u3002\u540c\u6837\u7684\uff0c\u8fd9\u4efd\u4ee3\u7801\u4eba\u4e3a\u964d\u4f4e\u4e86\u653b\u51fb\u6027\uff0c\u53ea\u505a\u6d4b\u8bd5\u7528\u9014\u3002<\/p>\n<p>1.3 HTTP Flood<\/p>\n<p>\u4e0a\u6587\u63cf\u8ff0\u7684SYN<\/p>\n<p>Flood\u3001DNS Query Flood\u5728\u73b0\u9636\u6bb5\u5df2\u7ecf\u80fd\u505a\u5230\u6709\u6548\u9632\u5fa1\u4e86\uff0c\u771f\u6b63\u53e6\u5404\u5927\u5382\u5546\u4ee5\u53ca\u4e92\u8054\u7f51\u4f01\u4e1a\u5934\u75bc\u7684\u662fHTTP Flood\u653b\u51fb\u3002HTTP Flood\u662f\u9488\u5bf9WEB\u670d\u52a1\u5728\u7b2c\u4e03\u5c42\u534f\u8bae\u53d1\u8d77\u7684\u653b\u51fb\uff0c\u5b83\u5de8\u5927\u5371\u5bb3\u6027\u4e3b\u8981\u8868\u73b0\u5728\u4e09\u4e2a\u65b9\u9762\uff0c\u53d1\u8d77\u65b9\u4fbf\uff1b\u8fc7\u6ee4\u56f0\u96be\uff1b\u5f71\u54cd\u6df1\u8fdc\u3002<\/p>\n<p>SYN Flood\u548cDNS Query Flood\u90fd\u9700\u8981\u653b\u51fb\u8005\u4ee5root\u6743\u9650\u63a7\u5236\u5927\u6279\u91cf\u7684\u5080\u5121\u673a\uff0c\u6536\u96c6\u5927\u91cfroot\u6743\u9650\u7684\u5080\u5121\u673a\u662f\u5f88\u82b1\u8d39\u65f6\u95f4\u7cbe\u529b\u7684\u4e00\u4ef6\u4e8b\u60c5\uff0c\u800c\u4e14\u5728\u653b\u51fb\u8fc7\u7a0b\u4e2d\u5080\u5121\u673a\u4f1a\u7531\u4e8e\u6d41\u91cf\u5f02\u5e38\u88ab\u7ba1\u7406\u5458\u53d1\u73b0\uff0c\u653b\u51fb\u8005\u7684\u8d44\u6e90\u5feb\u901f\u635f\u8017\u800c\u8865\u5145\u7f13\u6162\uff0c\u5bfc\u81f4\u653b\u51fb\u5f3a\u5ea6\u660e\u663e\u964d\u4f4e\u800c\u4e14\u4e0d\u53ef\u957f\u671f\u6301\u7eed\u3002HTTP Flood\u653b\u51fb\u5219\u4e0d\u540c\uff0c\u653b\u51fb\u8005\u5e76\u4e0d\u9700\u8981\u63a7\u5236\u5927\u6279\u7684\u5080\u5121\u673a\uff0c\u53d6\u800c\u4ee3\u4e4b\u7684\u662f\u901a\u8fc7\u7aef\u53e3\u626b\u63cf\u7a0b\u5e8f\u5728\u4e92\u8054\u7f51\u4e0a\u5bfb\u627e\u533f\u540d\u7684HTTP\u4ee3\u7406\u6216\u8005SOCKS\u4ee3\u7406\uff0c\u653b\u51fb\u8005\u901a\u8fc7\u533f\u540d\u4ee3\u7406\u5bf9\u653b\u51fb\u76ee\u6807\u53d1\u8d77HTTP\u8bf7\u6c42\u3002\u533f\u540d\u4ee3\u7406\u662f\u4e00\u79cd\u6bd4\u8f83\u4e30\u5bcc\u7684\u8d44\u6e90\uff0c\u82b1\u51e0\u5929\u65f6\u95f4\u83b7\u53d6\u4e0a\u5348\u7684\u4ee3\u7406\u5e76\u4e0d\u662f\u96be\u4e8b\uff0c\u56e0\u6b64\u653b\u51fb\u5bb9\u6613\u53d1\u8d77\u800c\u4e14\u53ef\u4ee5\u957f\u671f\u9ad8\u5f3a\u5ea6\u7684\u6301\u7eed\u3002<\/p>\n<p>\u53e6\u4e00\u65b9\u9762\uff0cHTTP<\/p>\n<p>Flood\u653b\u51fb\u5728HTTP\u5c42\u53d1\u8d77\uff0c\u6781\u529b\u6a21\u4eff\u6b63\u5e38\u7528\u6237\u7684\u7f51\u9875\u8bf7\u6c42\u884c\u4e3a\uff0c\u4e0e\u7f51\u7ad9\u4e1a\u52a1\u7d27\u5bc6\u76f8\u5173\uff0c\u5b89\u5168\u5382\u5546\u5f88\u96be\u63d0\u4f9b\u4e00\u5957\u901a\u7528\u7684\u4e14\u4e0d\u5f71\u54cd\u7528\u6237\u4f53\u9a8c\u7684\u65b9\u6848\u3002\u5728\u4e00\u4e2a\u5730\u65b9\u5de5\u4f5c\u7684\u5f88\u597d\u7684\u89c4\u5219\uff0c\u6362\u4e00\u4e2a\u573a\u666f\u53ef\u80fd\u5e26\u6765\u5927\u91cf\u7684\u8bef\u6740\u3002<\/p>\n<p>\u6700\u540e\uff0cHTTP Flood\u653b\u51fb\u4f1a\u5f15\u8d77\u4e25\u91cd\u7684\u8fde\u9501\u53cd\u5e94\uff0c\u4e0d\u4ec5\u4ec5\u662f\u76f4\u63a5\u5bfc\u81f4\u88ab\u653b\u51fb\u7684WEB\u524d\u7aef\u54cd\u5e94\u7f13\u6162\uff0c\u8fd8\u95f4\u63a5\u653b\u51fb\u5230\u540e\u7aef\u7684JAVA\u7b49\u4e1a\u52a1\u5c42\u903b\u8f91\u4ee5\u53ca\u66f4\u540e\u7aef\u7684\u6570\u636e\u5e93\u670d\u52a1\uff0c\u589e\u5927\u4ed6\u4eec\u7684\u538b\u529b\uff0c\u751a\u81f3\u5bf9\u65e5\u81f3\u5b58\u50a8\u670d\u52a1\u5668\u90fd\u5e26\u6765\u5f71\u54cd\u3002<\/p>\n<p>\u6709\u610f\u601d\u7684\u662f\uff0cHTTP<\/p>\n<p>Flood\u8fd8\u6709\u4e2a\u5256\u6709\u5386\u53f2\u6e0a\u6e90\u7684\u6635\u79f0\u53eb\u505aCC\u653b\u51fb\u3002CC\u662fChallenge Collapsar\u7684\u7f29\u5199\uff0c\u800cCollapsar\u662f\u56fd\u5185\u4e00\u5bb6\u8457\u540d\u5b89\u5168\u516c\u53f8\u7684DDoS\u9632\u5fa1\u8bbe\u5907\u3002\u4ece\u76ee\u524d\u7684\u60c5\u51b5\u6765\u770b\uff0c\u4e0d\u4ec5\u4ec5\u662fCollapsar\uff0c\u6240\u6709\u7684\u786c\u4ef6\u9632\u5fa1\u8bbe\u5907\u90fd\u8fd8\u5728\u88ab\u6311\u6218\u7740\uff0c\u98ce\u9669\u5e76\u672a\u89e3\u9664\u3002<\/p>\n<p>1.4 \u6162\u901f\u8fde\u63a5\u653b\u51fb<\/p>\n<p>\u4e00\u63d0\u8d77\u653b\u51fb\uff0c\u4e4b\u4e00\u53cd\u5e94\u5c31\u662f\u6d77\u91cf\u7684\u6d41\u91cf\uff0c\u6d77\u91cf\u7684\u62a5\u6587\u3002\u4f46\u662f\u6709\u4e00\u79cd\u653b\u51fb\u5374\u53cd\u5176\u9053\u800c\u884c\u4e4b\uff0c\u4ee5\u6162\u8457\u79f0\uff0c\u4ee5\u81f3\u4e8e\u6709\u4e9b\u653b\u51fb\u76ee\u6807\u88ab\u6253\u6b7b\u4e86\u90fd\u4e0d\u77e5\u9053\u662f\u600e\u4e48\u6b7b\u7684\uff0c\u8fd9\u5c31\u662f\u6162\u901f\u8fde\u63a5\u653b\u51fb\uff0c\u66f4\u5177\u4ee3\u8868\u6027\u7684\u662frsnake\u53d1\u660e\u7684SlowLoris\u3002<\/p>\n<p>HTTP\u534f\u8bae\u89c4\u5b9a\uff0cHTTP Request\u4ee5rnrn\u7ed3\u5c3e\u8868\u793a\u5ba2\u6237\u7aef\u53d1\u9001\u7ed3\u675f\uff0c\u670d\u52a1\u7aef\u5f00\u59cb\u5904\u7406\u3002\u90a3\u4e48\uff0c\u5982\u679c\u6c38\u8fdc\u4e0d\u53d1\u9001rnrn\u4f1a\u5982\u4f55\uff1fSlowLoris\u5c31\u662f\u5229\u7528\u8fd9\u4e00\u70b9\u6765\u505aDDoS\u653b\u51fb\u3002\u653b\u51fb\u8005\u5728HTTP\u8bf7\u6c42\u5934\u4e2d\u5c06Connection\u8bbe\u7f6e\u4e3aKeep-Alive\uff0c\u8981\u6c42Web Server\u4fdd\u6301TCP\u8fde\u63a5\u4e0d\u8981\u65ad\u5f00\uff0c\u968f\u540e\u7f13\u6162\u7684\u6bcf\u9694\u51e0\u5206\u949f\u53d1\u9001\u4e00\u4e2akey value\u683c\u5f0f\u7684\u6570\u636e\u5230\u670d\u52a1\u7aef\uff0c\u5982a:brn\uff0c\u5bfc\u81f4\u670d\u52a1\u7aef\u8ba4\u4e3aHTTP\u5934\u90e8\u6ca1\u6709\u63a5\u6536\u5b8c\u6210\u800c\u4e00\u76f4\u7b49\u5f85\u3002\u5982\u679c\u653b\u51fb\u8005\u4f7f\u7528\u591a\u7ebf\u7a0b\u6216\u8005\u5080\u5121\u673a\u6765\u505a\u540c\u6837\u7684\u64cd\u4f5c\uff0c\u670d\u52a1\u5668\u7684WEB\u5bb9\u5668\u5f88\u5feb\u5c31\u88ab\u653b\u51fb\u8005\u5360\u6ee1\u4e86TCP\u8fde\u63a5\u800c\u4e0d\u518d\u63a5\u53d7\u65b0\u7684\u8bf7\u6c42\u3002<\/p>\n<p>\u5f88\u5feb\u7684\uff0cSlowLoris\u5f00\u59cb\u51fa\u73b0\u5404\u79cd\u53d8\u79cd\u3002\u6bd4\u5982POST\u65b9\u6cd5\u5411WEB Server\u63d0\u4ea4\u6570\u636e\uff0c\u586b\u5145\u4e00\u5927\u5927Content-Length\u4f46\u662f\u7f13\u6162\u7684\u4e00\u4e2a\u5b57\u8282\u4e00\u4e2a\u5b57\u8282\u7684POST\u771f\u6b63\u6570\u636e\u5185\u5bb9\u7684\u7b49\u7b49\u3002\u5173\u4e8eSlowLoris\u653b\u51fb\uff0crsnake\u4e5f\u7ed9\u51fa\u4e86\u4e00\u4e2a\u6d4b\u8bd5\u4ee3\u7801\uff0c\u8fd9\u91cc\u3002<\/p>\n<p>2. DDoS\u653b\u51fb\u8fdb\u9636<\/p>\n<p>2.1 \u6df7\u5408\u653b\u51fb<\/p>\n<p>\u524d\u4e00\u7ae0\u4ecb\u7ecd\u4e86\u51e0\u79cd\u57fa\u7840\u7684\u653b\u51fb\u624b\u6bb5\uff0c\u5176\u4e2d\u4efb\u610f\u4e00\u79cd\u90fd\u53ef\u4ee5\u7528\u6765\u653b\u51fb\u7f51\u7edc\uff0c\u751a\u81f3\u51fb\u57ae\u963f\u91cc\u3001\u767e\u5ea6\u3001\u817e\u8baf\u8fd9\u79cd\u5de8\u578b\u7f51\u7ad9\u3002\u4f46\u662f\u8fd9\u4e9b\u5e76\u4e0d\u662f\u5168\u90e8\uff0c\u4e0d\u540c\u5c42\u6b21\u7684\u653b\u51fb\u8005\u80fd\u591f\u53d1\u8d77\u5b8c\u5168\u4e0d\u540c\u7684DDoS\u653b\u51fb\uff0c\u8fd0\u7528\u4e4b\u5999\uff0c\u5b58\u4e4e\u4e00\u5fc3\u3002<\/p>\n<p>\u9ad8\u7ea7\u7684\u653b\u51fb\u8005\u4ece\u6765\u4e0d\u4f1a\u4f7f\u7528\u5355\u4e00\u7684\u624b\u6bb5\u8fdb\u884c\u653b\u51fb\uff0c\u800c\u662f\u6839\u636e\u76ee\u6807\u7684\u73af\u5883\u7075\u6d3b\u7ec4\u5408\u3002\u666e\u901a\u7684SYN Flood\u5bb9\u6613\u88ab\u6d41\u91cf\u6e05\u6d17\u8bbe\u5907\u901a\u8fc7\u53cd\u5411\u63a2\u6d4b\u3001SYN Cookie\u7b49\u6280\u672f\u624b\u6bb5\u8fc7\u6ee4\u6389\uff0c\u4f46\u662f\u5982\u679c\u5728SYN Flood\u4e2d\u6df7\u5165SYN ACK\u6570\u636e\u5305\uff0c\u4f7f\u6bcf\u4e00\u4e2a\u4f2a\u9020\u7684SYN\u6570\u636e\u5305\u90fd\u6709\u4e00\u4e2a\u4e0e\u4e4b\u5bf9\u5e94\u7684\u4f2a\u9020\u7684\u5ba2\u6237\u7aef\u786e\u8ba4\u62a5\u6587\uff0c\u8fd9\u91cc\u7684\u5bf9\u5e94\u662f\u6307\u6e90IP\u5730\u5740\u3001\u6e90\u7aef\u53e3\u3001\u76ee\u7684IP\u3001\u76ee\u7684\u7aef\u53e3\u3001TCP\u7a97\u53e3\u5927\u5c0f\u3001TTL\u7b49\u90fd\u7b26\u5408\u540c\u4e00\u4e2a\u4e3b\u673a\u540c\u4e00\u4e2aTCP Flow\u7684\u7279\u5f81\uff0c\u6d41\u91cf\u6e05\u6d17\u8bbe\u5907\u7684\u53cd\u5411\u63a2\u6d4b\u548cSYN Cookie\u6027\u80fd\u538b\u529b\u5c06\u4f1a\u663e\u8457\u589e\u5927\u3002\u5176\u5b9eSYN\u6570\u636e\u62a5\u6587\u914d\u5408\u5176\u5b83\u5404\u79cd\u6807\u81f4\u4f4d\uff0c\u90fd\u6709\u7279\u6b8a\u7684\u653b\u51fb\u6548\u679c\uff0c\u8fd9\u91cc\u4e0d\u4e00\u4e00\u4ecb\u7ecd\u3002<\/p>\n<p>\u5bf9DNS Query<\/p>\n<p>Flood\u800c\u8a00\uff0c\u4e5f\u6709\u72ec\u7279\u7684\u6280\u5de7\u3002DNS\u53ef\u4ee5\u5206\u4e3a\u666e\u901aDNS\u548c\u6388\u6743\u57dfDNS\uff0c\u653b\u51fb\u666e\u901aDNS\uff0cIP\u5730\u5740\u9700\u8981\u968f\u673a\u4f2a\u9020\uff0c\u5e76\u4e14\u6307\u660e\u670d\u52a1\u5668\u8981\u6c42\u505a\u9012\u5f52\u89e3\u6790\u3002\u4f46\u662f\u653b\u51fb\u6388\u6743\u57dfDNS\uff0c\u4f2a\u9020\u7684\u6e90IP\u5730\u5740\u5219\u4e0d\u5e94\u8be5\u662f\u7eaf\u968f\u673a\u7684\uff0c\u800c\u5e94\u8be5\u662f\u4e8b\u5148\u6536\u96c6\u7684\u5168\u7403\u5404\u5730ISP\u7684DNS\u5730\u5740\uff0c\u8fd9\u6837\u624d\u80fd\u591f\u8fbe\u5230\u66f4\u5927\u653b\u51fb\u6548\u679c\uff0c\u6d41\u91cf\u6e05\u6d17\u8bbe\u5907\u5c06\u5904\u4e8e\u6dfb\u52a0IP\u9ed1\u540d\u5355\u548c\u4e0d\u6dfb\u52a0IP\u9ed1\u540d\u5355\u7684\u5c34\u5c2c\u5904\u5883\u3002\u6dfb\u52a0\u4f1a\u5bfc\u81f4\u5927\u91cf\u8bef\u6740\uff0c\u4e0d\u6dfb\u52a0\u9ed1\u540d\u5355\u5219\u6bcf\u4e2a\u62a5\u6587\u90fd\u9700\u8981\u53cd\u5411\u63a2\u6d4b\u52a0\u5927\u6027\u80fd\u538b\u529b\u3002<\/p>\n<p>\u53e6 \u4e00\u65b9\u9762\uff0c\u524d\u6587\u63d0\u5230\u4e3a\u4e86\u52a0\u5927\u6e05\u6d17\u8bbe\u5907\u7684\u538b\u529b\u4e0d\u547d\u4e2d\u7f13\u5b58\u800c\u9700\u8981\u968f\u673a\u5316\u8bf7\u6c42\u7684\u57df\u540d\uff0c\u4f46\u662f\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f85\u89e3\u6790\u57df\u540d\u5fc5\u987b\u5728\u4f2a\u9020\u4e2d\u5e26\u6709\u4e00\u5b9a\u7684\u89c4\u5f8b\u6027\uff0c\u6bd4\u5982\u8bf4\u53ea\u4f2a\u9020\u57df \u540d\u7684\u67d0\u4e00\u90e8\u5206\u800c\u56fa\u5316\u4e00\u90e8\u5206\uff0c\u7528\u6765\u7a81\u7834\u6e05\u6d17\u8bbe\u5907\u8bbe\u7f6e\u7684\u767d\u540d\u5355\u3002\u9053\u7406\u5f88\u7b80\u5355\uff0c\u817e\u8baf\u7684\u670d\u52a1\u5668\u53ef\u4ee5\u53ea\u89e3\u6790\u817e\u8baf\u7684\u57df\u540d\uff0c\u5b8c\u5168\u968f\u673a\u7684\u57df\u540d\u53ef\u80fd\u4f1a\u76f4\u63a5\u88ab\u4e22\u5f03\uff0c\u9700\u8981\u56fa\u5316\u3002 \u4f46\u662f\u5982\u679c\u5b8c\u5168\u56fa\u5b9a\uff0c\u4e5f\u5f88\u5bb9\u6613\u76f4\u63a5\u88ab\u4e22\u5f03\uff0c\u56e0\u6b64\u53c8\u9700\u8981\u4f2a\u9020\u4e00\u90e8\u5206\u3002<\/p>\n<p>\u5176\u6b21\uff0c\u5bf9DNS\u7684\u653b\u51fb\u4e0d\u5e94\u8be5\u53ea\u7740\u91cd\u4e8eUDP\u7aef\u53e3\uff0c\u6839\u636eDNS\u534f\u8bae\uff0cTCP\u7aef\u53e3\u4e5f\u662f\u6807\u51c6\u670d\u52a1\u3002\u653b\u51fb\u7684\u65f6\u5019\uff0c\u53ef\u4ee5UDP\u548cTCP\u653b\u51fb\u540c\u65f6\u8fdb\u884c\u3002<\/p>\n<p>HTTP Flood\u7684\u7740\u91cd\u70b9\uff0c\u5728\u4e8e\u7a81\u7834\u524d\u7aef\u7684cache\uff0c\u901a\u8fc7HTTP\u5934\u4e2d\u7684\u5b57\u6bb5\u8bbe\u7f6e\u76f4\u63a5\u5230\u8fbeWEB Server\u672c\u8eab\u3002\u53e6\u5916\uff0cHTTP Flood\u5bf9\u76ee\u6807\u7684\u9009\u53d6\u4e5f\u975e\u5e38\u5173\u952e\uff0c\u4e00\u822c\u7684\u653b\u51fb\u8005\u4f1a\u9009\u62e9\u641c\u7d22\u4e4b\u7c7b\u9700\u8981\u505a\u5927\u91cf\u6570\u636e\u67e5\u8be2\u7684\u9875\u9762\u4f5c\u4e3a\u653b\u51fb\u76ee\u6807\uff0c\u8fd9\u662f\u975e\u5e38\u6b63\u786e\u7684\uff0c\u53ef\u4ee5\u6d88\u8017\u670d\u52a1\u5668\u5c3d\u53ef\u80fd\u591a\u7684\u8d44\u6e90\u3002\u4f46\u662f\u8fd9\u79cd\u653b\u51fb\u5bb9\u6613\u88ab\u6e05\u6d17\u8bbe\u5907\u901a\u8fc7\u4eba\u673a\u8bc6\u522b\u7684\u65b9\u5f0f\u8bc6\u522b\u51fa\u6765\uff0c\u90a3\u4e48\u5982\u4f55\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1f\u5f88\u7b80\u5355\uff0c\u5c3d\u91cf\u9009\u62e9\u6b63\u5e38\u7528\u6237\u4e5f\u901a\u8fc7APP\u8bbf\u95ee\u7684\u9875\u9762\uff0c\u4e00\u822c\u6765\u8bf4\u5c31\u662f\u5404\u79cdWEB 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