{"id":860,"date":"2016-05-26T08:53:29","date_gmt":"2016-05-26T08:53:29","guid":{"rendered":"http:\/\/www.inforsec.org\/wp\/?p=860"},"modified":"2016-05-26T08:55:35","modified_gmt":"2016-05-26T08:55:35","slug":"%e9%98%b2%e6%ad%a2%e6%81%b6%e6%84%8f%e8%af%b7%e6%b1%82%e5%be%aa%e7%8e%af","status":"publish","type":"post","link":"http:\/\/202.112.238.40\/wp\/?p=860","title":{"rendered":"\u9632\u6b62\u6076\u610f\u8bf7\u6c42\u5faa\u73af"},"content":{"rendered":"<p>\u4f5c\u8005: Nick Sullivan (CloudFlare\uff0c 2016\u5e741\u670821\u65e5)\uff1b\u8bd1\u8005\uff1a Google Translate, Tao Wan (Huawei Canada\uff0c2016\u5e742\u67084\u65e5)<\/p>\n<p>Web\u662f\u4e00\u4e2a\u534f\u4f5c\u7684\u751f\u6001\u7cfb\u7edf\u3002 Web\u6807\u51c6\u7684\u5b58\u5728\uff0c\u4fdd\u8bc1\u4e86\u7f51\u7edc\u7684\u53c2\u4e0e\u8005\u4ee5\u53ef\u9884\u89c1\u7684\u65b9\u5f0f\u884c\u4e8b\u3002\u5982\u679c\u7f51\u7edc\u53c2\u4e0e\u8005\u504f\u79bb\u4e86\u65e2\u5b9a\u6807\u51c6\uff0c\u5c31\u4f1a\u53d1\u751f\u610f\u60f3\u4e0d\u5230\u7684\u7ed3\u679c\u3002\u672c\u6587\u63cf\u8ff0\u7684\u5c31\u662f\u8fd9\u6837\u4e00\u4e2a\u610f\u60f3\u4e0d\u5230\u7684\u7ed3\u679c\u3002<\/p>\n<p><!--more--><\/p>\n<p>\u6700\u8fd1\u4e00\u7ec4\u7814\u7a76\u4eba\u5458\u53d1\u8868\u5728NDSS 2016 \u7684\u4e00\u7bc7\u8bba\u6587 \u201cForwarding Loop Attacks in the Content Delivery Networks\u201c \uff08\u9488\u5bf9\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\u7684\u8f6c\u53d1\u73af\u8def\u653b\u51fb\uff09[1]\uff0c\u63cf\u8ff0\u4e86Web\u670d\u52a1\u5982\u679c\u4ee5\u4e0d\u517c\u5bb9\u7684\u65b9\u5f0f\u8fdb\u884c\u4ea4\u4e92\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002\u4ed6\u4eec\u63cf\u8ff0\u7684\u653b\u51fb\uff0c\u6076\u610f\u7528\u6237\u53ef\u4ee5\u8ba9\u591a\u4e2a\u670d\u52a1\u63d0\u4f9b\u5546\u76f8\u4e92\u53d1\u9001\u5176\u8bf7\u6c42\uff0c\u4ece\u800c\u5bfc\u81f4\u65e0\u4f11\u6b62\u7684\u5faa\u73af\u3002\u8fd9\u6837\u7684\u8bf7\u6c42\u5faa\u73af\u53ef\u4ee5\u5bfc\u81f4\u670d\u52a1\u4f9b\u5e94\u5546\u7684\u8d44\u6e90\u67af\u7aed\u548c\u670d\u52a1\u62d2\u7edd\u3002\u8be5\u8bba\u6587\u8fd8\u5c55\u793a\u4e86\uff0c\u8f6c\u53d1\u73af\u8def\u653b\u51fb\u5bf9\u5927\u6279\u7684CDN\u662f\u53ef\u884c\u7684\u3002<\/p>\n<p>\u9488\u5bf9\u4e0a\u8ff0\u8bba\u6587\u63d0\u5230\u7684\u653b\u51fb\uff0c\u6211\u4eec\u5df2\u7ecf\u5bf9CloudFlare\u7684\u670d\u52a1\u505a\u4e86\u76f8\u5e94\u7684\u4fee\u6539\uff0c\u4f7f\u4e4b\u7b26\u5408\u4e8eHTTP\u4ee3\u7406\u7684\u76f8\u5173\u6807\u51c6\u3002\u7136\u800c\u8981\u5f7b\u5e95\u907f\u514d\u4e0a\u8ff0\u653b\u51fb\uff0c\u6240\u6709\u7684\u4ee3\u7406\u670d\u52a1\u5fc5\u987b\u90fd\u9075\u5faa\u76f8\u5173\u6807\u51c6\u3002\u5982\u679c\u6709\u4e00\u4e2a\u670d\u52a1\u4f9b\u5e94\u5546\u4e0d\u9075\u5faa\u6807\u51c6\uff0c\u5176\u5b83\u6240\u6709\u9075\u5faa\u6807\u51c6\u7684\u670d\u52a1\u5546\uff0c\u4ecd\u7136\u53ef\u4ee5\u88ab\u653b\u51fb\u3002\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u8fd9\u79cd\u65b0\u578b\u7684\u653b\u51fb\uff0c\u5e76\u8bf4\u660e\uff0c\u4e00\u4e2a\u4f9b\u5e94\u5546\u5982\u4f55\u4ece\u95ee\u9898\u7684\u4e00\u90e8\u5206\uff0c\u53d8\u6210\u89e3\u51b3\u65b9\u6848\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<p><strong>\u53cd\u5411\u4ee3\u7406<\/strong><\/p>\n<p>CloudFlare \u662f\u4f7f\u7528\u53cd\u5411\u4ee3\u7406\u6765\u5de5\u4f5c\u7684\u3002\u5f53HTTP\uff08S\uff09\u8bf7\u6c42\u8fdb\u5165CloudFlare\u7684\u7f51\u7edc\uff0c\u4f1a\u53d1\u751f\u4e0b\u9762\u7684\u4e24\u79cd\u60c5\u51b5\u4e4b\u4e00; 1\uff09CloudFlare\u8fd4\u56de\u7f13\u5b58\u7684\u54cd\u5e94\uff1b2) CloudFlare\u5411\u539f\u59cb\u7f51\u7ad9\u53d1\u51fa\u8bf7\u6c42\uff0c\u5e76\u8f6c\u53d1\u539f\u59cb\u7f51\u7ad9\u8fd4\u56de\u7684\u76f8\u5e94\u3002CloudFlare\u53ef\u4ee5\u68c0\u67e5\u548c\u4fee\u6539\u901a\u8fc7\u5176\u7f51\u7edc\u7684\u8bf7\u6c42\uff0c\u8fd9\u4e2a\u80fd\u529b\u4f7f\u5f97\u8bb8\u591a\u5f3a\u5927\u7684\u529f\u80fd\u6210\u4e3a\u53ef\u80fd\uff0c\u4f8b\u5982\u9ad8\u901f\u7f13\u5b58\u3001WAF(Web\u5e94\u7528\u9632\u706b\u5899)\u3001RocketLoader\u7b49\u7b49\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5728\u4e00\u4e2a\u7f51\u7ad9\u7684\u524d\u9762\u4f7f\u7528\u591a\u4e2a\u53cd\u5411\u4ee3\u7406\u4e5f\u5e76\u4e0d\u5c11\u89c1\u3002\u8fd9\u79cd\u505a\u6cd5\u79f0\u4e3a\u5806\u53e0\u4ee3\u7406(Stacking proxies)\uff0c\u901a\u5e38\u88ab\u7528\u6765\u63d0\u4f9b\u591a\u4e2a\u4e0d\u540c\u7684\u670d\u52a1\u7279\u6027\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5CloudFlare\u8fdb\u884c\u7f13\u5b58\uff0c\u4f46\u4f7f\u7528\u53e6\u5916\u4e00\u4e2a\u670d\u52a1\u5546\u7684WAF\u3002\u867d\u7136\u6211\u4eec\u66f4\u5e0c\u671b\u5ba2\u6237\u4f7f\u7528CloudFlare\u63d0\u4f9b\u7684\u5148\u8fdb\u7684WAF\uff0c\u4f46\u4f7f\u7528\u5176\u5b83\u7684WAF\u4e5f\u662f\u5408\u7406\u7684\uff0c\u800c\u4e14\u6211\u4eec\u7684\u5f88\u591a\u5ba2\u6237\u4e5f\u662f\u8fd9\u4e48\u505a\u7684\u3002\u591a\u4e2a\u4ee3\u7406\u53ef\u4ee5\u5728\u539f\u59cb\u670d\u52a1\u5668\u7684\u524d\u9762\u88ab\u5806\u53e0\uff0c\u4f46\u662f\uff0c\u5982\u679c\u6700\u540e\u4e00\u4e2a\u4ee3\u7406\u6307\u5411\u4e86\u7b2c\u4e00\u4e2a\u4ee3\u7406\u4f1a\u53d1\u751f\u4ec0\u4e48\uff1f\u4f60\u5c06\u5f97\u5230\u4e00\u4e2a\u4ee3\u7406\u5faa\u73af\u3002<\/p>\n<p>\u4e24\u4e2a\u4ee3\u7406\u5f62\u6210\u7684\u5faa\u73af\u5f88\u5bb9\u6613\u7406\u89e3\u3002\u914d\u7f6e\u7b2c\u4e00\u4e2a\u53cd\u5411\u4ee3\u7406\u4f7f\u7528\u7b2c\u4e8c\u53cd\u5411\u4ee3\u7406\u4f5c\u4e3a\u6e90\u7f51\u7ad9\uff0c\u540c\u65f6\u914d\u7f6e\u7b2c\u4e8c\u4e2a\u53cd\u5411\u4ee3\u7406\u4f7f\u7528\u7b2c\u4e00\u4e2a\u4f5c\u4e3a\u5b83\u7684\u6e90\u7f51\u7ad9\u3002<\/p>\n<p><a href=\"http:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2016\/05\/1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-861 aligncenter\" src=\"http:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2016\/05\/1.png\" alt=\"1\" width=\"515\" height=\"260\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2016\/05\/1.png 515w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2016\/05\/1-300x151.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2016\/05\/1-250x126.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2016\/05\/1-150x76.png 150w\" sizes=\"auto, (max-width: 515px) 100vw, 515px\" \/><\/a><\/p>\n<p>\u4ece\u7406\u8bba\u4e0a\u8bf4\uff0c\u53d1\u7ed9\u8be5\u7f51\u7ad9\u7684\u4efb\u4f55\u8bf7\u6c42\u6700\u7ec8\u4f1a\u5728\u4e24\u4e2a\u4ee3\u7406\u4e4b\u95f4\u88ab\u6765\u56de\u53d1\u9001\u3002\u6bcf\u6b21\u5faa\u73af\u90fd\u5c06\u5bfc\u81f4\u4e00\u4e2a\u8bf7\u6c42\u88ab\u53d1\u9001\uff0c\u5e76\u6d88\u8017\u8d44\u6e90\u3002\u5e78\u8fd0\u7684\u662f\uff0c\u5927\u591a\u6570\u53cd\u5411\u4ee3\u7406\u90fd\u6709\u4fdd\u62a4\uff0c\u53ef\u4ee5\u907f\u514d\u8fd9\u6837\u7684\u7b80\u5355\u653b\u51fb\u3002<\/p>\n<p><strong>\u9632\u6b62\u7b80\u5355\u7684\u5faa\u73af<\/strong><\/p>\n<p>HTTP 1.1\u7684\u4f5c\u8005\u610f\u8bc6\u5230\u8bf7\u6c42\u5faa\u73af\u7684\u53ef\u80fd\u6027\uff0c\u5e76\u5728\u5236\u5b9a\u6807\u51c6\u65f6\uff0c\u5b9a\u4e49\u4e86\u76f8\u5e94\u7684\u4fdd\u62a4\u3002\u8fd9\u4e2a\u73af\u8def\u4fdd\u62a4\u662f\u901a\u8fc7 \u201cVia\u201d \u62a5\u5934\u6765\u5b9e\u73b0\u7684\u3002\u4e0b\u9762\u7684\u6bb5\u843d\u6765\u81ea RFC 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\u76843.6.7\uff09\u3002\u201cVia\u201d\u5934\u5b57\u6bb5\u53ef\u4ee5\u7528\u6765\u5411\u524d\u8ffd\u8e2a\u6d88\u606f\uff0c\u4ece\u800c\u907f\u514d\u8bf7\u6c42\u5faa\u73af\uff0c\u5e76\u53d1\u73b0\u8bf7\u6c42\/\u54cd\u5e94\u94fe\u4e2d\u53d1\u4ef6\u8005\u7684\u534f\u8bae\u529f\u80fd\u3002<\/p>\n<p>&#8230;<\/p>\n<p>\u4e00\u4e2a\u201cVia\u201d\u5934\u5b57\u6bb5\u7684\u591a\u4e2a\u57df\u503c\u53ef\u4ee5\u88ab\u7528\u6765\u8868\u793a\u5355\u4e2a\u4ee3\u7406\u6216\u7f51\u5173\u3002\u6bcf\u4e00\u4e2a\u4e2d\u95f4\u4eba\u90fd\u8ffd\u52a0\u81ea\u5df1\u7684\u4fe1\u606f\uff0c\u6765\u8868\u8ff0\u5982\u4f55\u63a5\u6536\u5230\u8be5\u6d88\u606f\uff0c\u6700\u7ec8\u7ed3\u679c\u662f\uff0c\u6240\u6709\u8f6c\u53d1\u4ee3\u7406\u5f62\u6210\u4e86\u4e00\u4e2a\u6392\u5e8f\u3002\u4e00\u4e2a\u4ee3\u7406\u5728\u8f6c\u53d1\u6bcf\u4e2a\u6d88\u606f\u65f6\uff0c \u5fc5\u987b\u6309\u7167\u4ee5\u4e0b\u8981\u6c42\uff0c\u6dfb\u52a0\u76f8\u5e94\u7684 \u201cVia\u5934\u5b57\u6bb5\u3002\u4e00\u4e2aHTTP\u5230HTTP\u7684\u7f51\u5173\u5fc5\u987b\u5728\u6bcf\u4e2a\u5165\u7ad9\u8bf7\u6c42\u6d88\u606f\u4e2d\u6dfb\u52a0 \u201dVia\u201c\u5934\u5b57\u6bb5\uff0c\u53ef\u4ee5\u5728\u8f6c\u53d1\u7684\u54cd\u5e94\u6d88\u606f\u4e2d\u6dfb\u52a0\u201dVia\u201c\u5934\u5b57\u6bb5\u3002<\/p>\n<p>&#8230;<\/p>\n<p>\u4f8b\u5982\uff0c\u4e00\u4e2a\u8bf7\u6c42\u6d88\u606f\u53ef\u4ee5\u4eceHTTP \/ 1.0\u7684\u7528\u6237\u4ee3\u7406\u88ab\u53d1\u9001\u5230\u4e00\u4e2a\u53eb\u201dfred\u201d\u7684\u5185\u90e8\u4ee3\u7406\uff0c\u8be5\u5185\u90e8\u4ee3\u7406\u4f7f\u7528HTTP \/ 1.1\u628a\u8bf7\u6c42\u8f6c\u53d1\u5230\u4e00\u4e2a\u516c\u5171\u4ee3\u7406p.example.net\uff0c\u8be5\u516c\u5f00\u4ee3\u7406\u5219\u5c06\u8bf7\u6c42\u8f6c\u53d1\u5230\u539f\u59cb\u670d\u52a1\u5668www.example.com\uff0c \u4ece\u800c\u5b8c\u6210\u4e86\u8be5\u6b21\u8bf7\u6c42\u3002www.example.com\u63a5\u6536\u5230\u7684\u8bf7\u6c42\u5c06\u6709\u4ee5\u4e0b\u7684 Via\u5934\u5b57\u6bb5\uff1a<\/p>\n<p>Via: 1.0 fred, 1.1 p.example.net<\/p>\n<p>\u4e00\u4e2a\u53d1\u9001\u8005\uff0c\u4e0d\u5e94\u8be5\u5408\u5e76\u201dVia\u201d \u7684\u591a\u4e2a\u6761\u76ee\uff0c\u9664\u975e\u5b83\u4eec\u5c5e\u4e8e\u540c\u4e00\u4e2a\u7ec4\u7ec7\uff0c\u5e76\u4e14\u4e3b\u673a\u4fe1\u606f\u5df2\u7ecf\u88ab\u533f\u540d\u5316\u4e86\u3002\u5982\u679c\u201dVia\u201d \u7684\u591a\u4e2a\u6761\u76ee\u5305\u542b\u4e86\u4e0d\u540c\u7684\u534f\u8bae\u503c\uff0c\u5219\u7edd\u5bf9\u4e0d\u53ef\u4ee5\u88ab\u5408\u5e76\u3002<\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211; &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<\/p>\n<p>CloudFlare\u76ee\u524d\u4f7f\u7528\u4e86\u8fd9\u4e00\u673a\u5236\uff0c\u4ee5\u9632\u6b62\u8bf7\u6c42\u5faa\u73af\u3002\u5f53\u4e00\u4e2a\u8bf7\u6c42\u901a\u8fc7CloudFlare\u7684\u7f51\u7edc\u65f6\uff0c\u5e76\u4e14\u4e0d\u5728\u7f13\u5b58\u4e2d\uff0cCloudFlare\u5c06\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u8bf7\u6c42\uff0c\u53d1\u7ed9\u539f\u59cb\u7f51\u7ad9\u3002CloudFlare\u53d1\u51fa\u8bf7\u6c42\u7684\u201dVia\u201d \u5934\u5b57\u6bb5\u4e2d\uff0c \u5305\u542b\u4ece\u4e0a\u4e00\u4e2a\u8282\u70b9\u6536\u5230\u8bf7\u6c42\u7684HTTP 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href=\"http:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2016\/05\/3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-863 aligncenter\" src=\"http:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2016\/05\/3.png\" alt=\"3\" width=\"515\" height=\"265\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2016\/05\/3.png 515w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2016\/05\/3-300x154.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2016\/05\/3-250x129.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2016\/05\/3-150x77.png 150w\" sizes=\"auto, (max-width: 515px) 100vw, 515px\" 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Sharma\u5e2e\u52a9\u5b9e\u65bd\u4e86\u57fa\u4e8e\u201cVia\u201d\u5934\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p><strong>\u53c2\u8003\u6587\u732e\uff1a<\/strong><\/p>\n<p>[1] Jianjun Chen, Jian Jiang, Xiaofeng Zheng, Haixin Duan, Jinjin Liang, Tao Wan, Kang Li, Vern Paxson, Forwarding-Loop Attacks in Content Delivery Networks, accepted by NDSS 2016 \u3002NDSS\u662f\u56fd\u9645\u7f51\u7edc\u5b89\u5168\u56db\u5927\u4f1a\u8bae\u4e4b\u4e00\uff0c\u672c\u6587\u83b7NDSS 2016\u5e74\u6770\u51fa\u8bba\u6587\uff08Distinguished Paper\uff09\u3002<\/p>\n<p>[2]\u8bba\u6587\u4e0b\u8f7d\uff1a<a href=\"http:\/\/netsec.ccert.edu.cn\/duanhx\/files\/2010\/12\/cdn_loop-final-camera-ready.pdf\">http:\/\/netsec.ccert.edu.cn\/duanhx\/files\/2010\/12\/cdn_loop-final-camera-ready.pdf<\/a><\/p>\n<p>[3]\u539f\u6587\u5730\u5740\uff1a <a href=\"https:\/\/blog.cloudflare.com\/preventing-malicious-request-loops\/\">https:\/\/blog.cloudflare.com\/preventing-malicious-request-loops\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f5c\u8005: Nick Sullivan (CloudFlare\uff0c 2016\u5e741\u670821\u65e5)\uff1b\u8bd1\u8005\uff1a Goo&#8230; <a class=\"continue-reading-link\" href=\"http:\/\/202.112.238.40\/wp\/?p=860\"> Continue reading <span class=\"meta-nav\">&rarr; <\/span><\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-860","post","type-post","status-publish","format-standard","hentry","category-research"],"_links":{"self":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/860","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=860"}],"version-history":[{"count":6,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/860\/revisions"}],"predecessor-version":[{"id":869,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/860\/revisions\/869"}],"wp:attachment":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=860"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}